JP6763503B2 - Power control unit - Google Patents

Description

The present invention relates to a power supply control device, for example, a power supply for being used by being mounted on an artificial satellite, operating as a device for supplying output power of a single or a plurality of solar cell arrays to a load, and stably controlling a bus voltage. Regarding the control device.

In artificial satellites and the like, a power supply control device is usually used to supply bus power as a DC-stabilized voltage (bus voltage) such as 28V, 50V, 100V.

One of the power control methods for artificial satellites is the DET (Direct Energy Transfer) method in which the power output end is directly connected to the load by a power supply line without interposing a control element. In the DET method, when the solar cell array of an artificial satellite is irradiated with sunlight (during sunshine), the power generated by one or more solar cell arrays is used as the supply power directly to the load via the current backflow prevention element. The surplus power is transmitted and adjusted by short-circuiting (shunting) the output of a specific solar cell array to control the DC bus voltage (28V, 50V, 100V, etc.) so that it is in a stable state. is there.

Such a DET method is broadly divided into two types of shunt control methods, an analog shunt method and a digital shunt method, with respect to a method of short-circuiting (shunting) output power. The power supply control device that adopts the digital shunt method as the DET method can efficiently supply the power generated by the solar cell array to the load, although the circuit is simpler than other power supply control devices. Because of its advantage, it is used in artificial satellites for various purposes around the world, including the Engineering Test Satellite Series (ETS series).

In a power supply control device that employs such a digital shunt type DET method, the total value of power or current generated from one or more solar cell arrays by a switching operation that shunts or opens the output of each solar cell array. Is adjusted to control the bus voltage. Then, each solar cell array is shunted or opened corresponding to the bus voltage fluctuation range allowed in advance so that each solar cell array is shunted or opened in order according to the fluctuation of the bus voltage. The operating area is allocated. The bus voltage fluctuates by the switching operation of the negative feedback oscillation control (commonly called bang-bang control) consisting of this shunt or open operation and the capacitor bank provided to smooth the bus voltage. A mechanism for stabilizing within a width range is adopted (see, for example, Non-Patent Document 1, Patent Document 1, Patent Document 2, and Patent Document 3).

In such a power supply control device, the number of constituent stages of the solar cell array and the current value per stage of the array are determined according to the magnitude of the required generated power. The number of stages of the solar cell array is usually several to several tens of stages, and the shunt or open operating area for each solar cell array is within the range of the bus voltage fluctuation range allowed in advance. It is divided and allocated according to the number of constituent stages. That is, the voltage fluctuation width allowed between the stages of the constituent stages is roughly determined by the bus voltage fluctuation width / the number of constituent stages.

In recent years, there has been a tendency to narrow the bus voltage fluctuation range as much as possible to within 1V to 3V due to the demand for performance improvement of the power supply control device, and at the same time, the number of stages constituting the solar cell array has been increased due to the demand for power increase. There is a tendency for the current value per stage of the array to increase and the bus voltage to increase (28V → 50V → 100V). Due to these effects, the allowable voltage fluctuation range between the array stages constituting the solar cell array becomes very narrow, while the switching noise tends to increase due to the increase in current and voltage accompanying the increase in power.

Japanese Unexamined Patent Publication No. 2011-87379 JP-A-2009-118699 JP-A-2009-206176

S. Kuwajima, et al. , "Digital sequential shunt regulator for solar power conditioning of engineering test satellite (ETS-V)," Power Electronics Specialists Conference 1988 (PESC'88), IEEE, April 1988.

As described above, in recent power supply control devices, in order to meet the demand for improving bus voltage stability, the bus voltage fluctuation range tends to be narrowed as much as possible to be suppressed to about 1V to 3V, and at the same time, a power increase demand is required. In order to cope with the above, there is a tendency that the number of stages constituting the solar cell array is increased, the current value per stage of the array is increased, and the bus voltage is increased (28V → 50V → 100V). As mentioned above, due to these effects, the allowable voltage fluctuation range between the array stages in the solar cell array becomes very narrow, while the switching noise tends to increase due to the increase in current and voltage accompanying the increase in power. ..

In the conventional technology, the switching noise that increases with the increase of current and voltage deviates from the voltage fluctuation range allowed between the array stages in the solar cell array, and the demand and power to make the bus voltage fluctuation range as narrow as possible. It was difficult to meet the demand for increase. Specifically, although it is preferable to perform the shunt or release operation one step at a time, each power supply control circuit corresponding to each of the plurality of solar cell arrays performs the shunt or release operation simultaneously or simultaneously. Therefore, the conventional technology has a drawback that the bus voltage deviates from the permissible fluctuation range and the control system of the bus voltage becomes unstable operation and a problem to be solved that deviates from the permissible voltage fluctuation range. It was.

To solve these problems, the following three solutions can be considered. The first is to slow down the response of the negative feedback oscillation control system so that the control system does not respond to switching noise. The second is a method of expanding the permissible fluctuation range of the bus voltage. The third is a method of reducing switching noise.

The first method of slowing down the response of the control system has a drawback that the response to normal bus voltage fluctuations other than switching noise is often delayed, and the control characteristics are deteriorated. The second method of expanding the permissible fluctuation range of the bus voltage contradicts the requirement for improving the bus voltage stability of the power supply controller (the requirement for narrowing the bus voltage fluctuation range as much as possible). Therefore, the third method of reducing switching noise is considered to be the optimum solution.

The following four solutions can be considered for reducing switching noise. The first is a method of reducing electric power such as reducing the current value per stage of the array and lowering the bus voltage. The second is to increase the capacity of the capacitor bank. The third method is to slow down the rising and falling edges of the voltage and current waveform pulses during switching. The fourth method is to add a noise removal circuit in the immediate vicinity of the noise source.

The first method of reducing the power, such as reducing the current value per stage of the array or lowering the bus voltage, contradicts the power increase requirement for the power supply control device, and is therefore difficult to adopt. The second method of increasing the capacitor bank capacity is that the capacitor bank is generally located at a distance from the source of switching noise, so even if the capacitor bank capacity is increased, the effect of reducing switching noise is achieved. Is small in many cases, and in order to obtain the effect, it is necessary to considerably increase the capacity of the capacitor bank, which hinders the reduction in size and weight of the power supply control device. Various realization measures can be considered for the method of slowing the rising and falling edges of the voltage and current waveform pulses in the third switching, but there are also disadvantages such as circuit complexity and increased heat generation. It is often difficult to realize a method that avoids the disadvantages in an actual circuit. Therefore, it is considered most desirable to add a switching noise removal circuit in the immediate vicinity of the fourth noise source.

(Purpose of the present invention)
The present invention has been made to solve such a problem, and controls to shunt or open each solar cell array or each solar cell simulation device, which is a power source, in order (sequentially) according to fluctuations in bus voltage. An object of the present invention is to provide a power supply control device capable of reducing switching noise by adding a circuit for removing switching noise in the immediate vicinity of a noise generation source.

Furthermore, it can be realized with a compact, lightweight, and simple circuit configuration, there are few disadvantages such as an increase in heat generation, and a requirement for improved bus voltage stability (a requirement for narrowing the bus voltage fluctuation range as much as possible). It is also an object of the present invention to provide a power supply control device capable of simultaneously fulfilling the demand for power increase.

In order to solve the above-mentioned problems, the power supply control device according to the present invention mainly adopts the following characteristic configurations.

(1) The power supply control device according to the present invention is
A power supply control circuit that controls power supply to a load is connected to each of the positive electrode side power output line and the negative electrode side power output line of each of the solar cell arrays corresponding to each of the single or multiple solar cell arrays. The positive electrode side power output line and the negative electrode side power output line of the power supply control circuit are connected to each other at the output ends, and are connected to the load as a positive electrode side bus voltage line and a negative electrode side bus voltage line, and are connected to the positive electrode side. A power supply control device in which a first capacitor bank for smoothing the bus voltage supplied to the load is connected between the bus voltage line and the negative electrode side bus voltage line.
Each power control circuit
A first switch element connected between the positive electrode side power output line and the negative electrode side power output line,
It has a first current backflow prevention element connected on the positive electrode side power output line, and further
For reducing switching noise between the downstream terminal of the first current backflow prevention element, which is closest to the noise generation source during the switching operation of the first switch element, and the negative electrode side terminal of the first switch element. With a second capacitor bank connected as
The result of monitoring the bus voltage, which is the potential difference between both ends of the first capacitor bank connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line, and the result allocated to the power supply control circuit in advance. It is characterized in that the first switch element is shunted or opened according to the comparison result with the first reference voltage.

(2) The power supply control device according to the present invention is
Power is supplied to the positive electrode side power output line and the negative electrode side power output line of each of the solar cell arrays or each of the solar cell simulation devices in response to each of the single or multiple solar cell arrays or solar cell simulation devices. Each of the power supply control circuits to be controlled is connected, and each of the power supply control circuits is connected to each other at the output ends of the positive electrode side power output line and the negative electrode side power output line, and the positive electrode side bus voltage line and the negative electrode side bus voltage line are connected to each other. As a power supply control device, a first capacitor bank for smoothing the bus voltage supplied to the load is connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line while being connected to the load. And
A battery for supplying power for operating each of the power supply control circuits is provided, a positive electrode side terminal of the battery is connected to the positive electrode side power output line via a positive electrode side battery voltage line, and a negative electrode side terminal of the battery is a negative electrode. Connected to the negative electrode side power output line via the side battery voltage line,
Each power control circuit
A first switch element and a first resistor connected in series between the positive electrode side power output line and the negative electrode side power output line are connected.
A first current backflow prevention element and a second resistor are connected in series to the positive electrode side power output line.
A discharge circuit for discharging the electric power stored in the battery is connected between the downstream side of the second resistor on the positive electrode side power output line and the positive electrode side battery voltage line.
A second switch element and a second current backflow connected in series between the upstream side of the first current backflow prevention element on the positive electrode side bus voltage line and the connection point between the discharge circuit and the battery. Connect with the prevention element,
The input end of the differential amplifier that amplifies the differential voltage between the positive electrode side bus voltage line and the negative electrode side bus voltage line at a predetermined amplification factor is the positive electrode side bus voltage line and the negative electrode side bus voltage line. Connect with and
The output end of the differential amplifier is connected to the input end of each of the first comparator and the second comparator.
The output end of the first comparator is connected to the control end of the first driver that drives the first switch element, and the output end of the second comparator drives the second switch element. Connect to the control end of the driver of 2
The downstream terminal of the first current backflow prevention element, which is the closest to the noise generation source during the switching operation of the first switch element or the second switch element, and the terminal to which the first driver is connected are connected. The configuration is such that the second capacitor bank and the third resistor connected in series are connected between the remaining terminals of the first switch element to be removed and the low potential side terminals.
In the first comparator, the result of comparing the output voltage from the differential amplifier with the first reference voltage pre-allocated to the power supply control circuit is input to the first driver as the first control amount. By doing so, the switching operation of shunting or opening the first switch element is controlled.
And,
In the second comparator, the result of comparing the output voltage from the differential amplifier with the second reference voltage pre-allocated to the power supply control circuit is input to the second driver as the second control amount. This is characterized in that the switching operation of short-circuiting or opening the second switch element is controlled.

According to the power supply control device of the present invention, the following effects can be obtained.

The first effect is that in the power supply control device that controls the output power of the solar cell or the solar cell simulation device used as the power generation source, the noise generation source during the switching operation of the first switch element or the second switch element. The negative electrode of the first switch element connected between the downstream terminal of the first current backflow prevention element connected on the positive electrode side power output line and the positive electrode side power output line and the negative electrode side power output line, which is the nearest. Since the second capacitor bank is connected between the side terminal (low potential side terminal) for switching noise reduction, it is possible to realize compact, lightweight, simple circuit configuration and switching noise reduction. Can be done.

As a second effect, in the power supply control device that controls the output power of the solar cell or the solar cell simulation device used as the power generation source, there are few disadvantages such as an increase in heat generation amount, and switching noise can be reduced. ..

It is a circuit diagram which shows an example of the circuit structure of the power supply control device which concerns on this invention. It is a characteristic diagram which shows an example of the voltage waveform image in the power-source control apparatus shown in FIG.

Hereinafter, preferred embodiments of the power supply control device according to the present invention will be described with reference to the accompanying drawings. It goes without saying that the drawing reference reference numerals attached to the following drawings are added to each element for convenience as an example for assisting understanding, and the present invention is not intended to be limited to the illustrated embodiment. No.

(Features of the present invention)
Prior to the description of the embodiment of the present invention, the outline of the features of the present invention will be described first. The present invention
By installing on each power output line to supply power to a load from a power source using a single or multiple solar array or solar cell simulator and shunting or opening, each said power output line It is a power supply control device that suppresses an increase in the bus voltage due to surplus power on the bus voltage line that is connected to each other on the downstream side and output to the load as a bus voltage.
After smoothing the power output from the power generation source by a capacitor bank via a current backflow prevention element connected in series with the positive electrode side power output line, the positive electrode side bus voltage line and the negative electrode side bus voltage line on the downstream side are formed. Supply to the load via
When power is supplied to the load, it accompanies a sudden fluctuation in bus voltage caused by the shunt or opening operation of the switch element connected between the positive electrode side power output line and the negative electrode side power output line from the power generation source. The switching noise generated is connected via a resistor between the downstream terminal of the current backflow prevention element, which is closest to the source of the switching noise, and the negative electrode side terminal (low potential side terminal) of the switch element. The main feature is to suppress the resonance that occurs during switching operation while reducing the voltage by using the capacitor.

More specifically, the present invention is characterized by adopting the following circuit configuration. That is,
Power is supplied to the positive electrode side power output line and the negative electrode side power output line of each of the solar cell arrays or each of the solar cell simulation devices in response to each of the single or multiple solar cell arrays or solar cell simulation devices. Each of the power supply control circuits to be controlled is connected, and each of the power supply control circuits is connected to each other at the output ends of the positive electrode side power output line and the negative electrode side power output line, and the positive electrode side bus voltage line and the negative electrode side bus voltage line are connected to each other. As a power supply control device, a first capacitor bank for smoothing the bus voltage supplied to the load is connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line while being connected to the load. And
The negative electrode side terminal of the battery that supplies operating power to each power supply control circuit via the positive electrode side battery voltage line is connected to the negative electrode side power output line via the negative electrode side battery voltage line.
Each power control circuit
A first switch element and a first resistor connected in series between the positive electrode side power output line and the negative electrode side power output line are connected.
A first current backflow prevention element and a second resistor are connected in series to the positive electrode side power output line.
A discharge circuit for discharging the electric power stored in the battery is connected between the downstream side of the second resistor on the positive electrode side power output line and the positive electrode side battery voltage line.
A second switch element and a second current backflow connected in series between the upstream side of the first current backflow prevention element on the positive electrode side bus voltage line and the connection point between the discharge circuit and the battery. Connect with the prevention element,
The input end of the differential amplifier that amplifies the differential voltage between the positive electrode side bus voltage line and the negative electrode side bus voltage line at a predetermined amplification factor is the positive electrode side bus voltage line and the negative electrode side bus voltage line. Connect with and
The output end of the differential amplifier is connected to the input end of each of the first comparator and the second comparator.
The output end of the first comparator is connected to the control end of the first driver that drives the first switch element, and the output end of the second comparator drives the second switch element. Connect to the control end of the driver of 2
The downstream terminal of the first current backflow prevention element, which is the closest to the noise generation source during the switching operation of the first switch element or the second switch element, and the terminal to which the first driver is connected are connected. The configuration is such that the second capacitor bank and the third resistor connected in series are connected between the remaining terminals of the first switch element to be removed and the low potential side terminals.
In the first comparator, the result of comparing the output voltage from the differential amplifier with the first reference voltage pre-allocated to the power supply control circuit is input to the first driver as the first control amount. By doing so, the switching operation of shunting or opening the first switch element is controlled.
And,
In the second comparator, the result of comparing the output voltage from the differential amplifier with the second reference voltage pre-allocated to the power supply control circuit is input to the second driver as the second control amount. The main feature is to control the switching operation of short-circuiting or opening the second switch element.

Thus, the downstream terminal of the first current backflow prevention element, which is closest to the source of switching noise during the switching operation of the first switch element or the second switch element, and the first switch. Of the three terminals of the element, the second capacitor bank and the terminal are between the low potential side terminal, that is, the negative voltage side terminal of the remaining two terminals excluding the terminal (gate) to which the first driver is connected. By adopting a circuit configuration in which a third resistor is connected in series, the switching noise of the first switch element or the second switch element is absorbed by the second capacitor bank, and the second capacitor bank is used. The resistance of 3 makes it possible to dampen the resonance generated during the switching operation by the first capacitor bank, the second capacitor bank, and the inductance component contained in the wiring, and the bus voltage caused by the switching operation can be damped. Fluctuations can be suppressed within the allowable voltage range.

(Embodiment)
Next, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a circuit diagram showing an example of a circuit configuration of a power supply control device according to the present invention, and shows a configuration example of a power supply control device provided with a switching noise reduction mechanism. FIG. 2 is a characteristic diagram showing an example of a voltage waveform image in the power supply control device shown in FIG. 1, and illustrates an example of the effect of the power supply control device of FIG. 1 by providing a switching noise reduction mechanism.

(Structure example of the embodiment)
First, the configuration of the power supply control device according to the present embodiment will be described in detail with reference to FIG.

The power generation source is composed of a single or a plurality of solar cell arrays 21, 22, ..., 2n having an n-stage (n: natural number) configuration. Each of the solar cell arrays 21, 22, ..., 2n is a power generator configured by connecting a plurality of single solar cells in series and parallel. It is assumed that the load power required by the load 30 is smaller than the total generated power of the solar cell arrays 21, 22, ..., 2n, that is, the total output power.

Single or multiple solar cell arrays 21, 22, ..., 2n, respectively, with n-stage power output line SAP HOT and negative electrode side power output line SAP RTN, and n-stage power control circuits 11, 12, ..., Each of 1n is connected. The n-stage power supply control circuits 11, 12, ..., 1n form the power supply control device 10. Each of the n-stage power supply control circuits 11, 12, ..., 1n operates by supplying power from the bus voltage line. Further, the positive electrode side power output line SAP HOT and the negative electrode side power output line SAP RTN of each of the n-stage power supply control circuits 11, 12, ..., 1n are connected to each other at their respective output ends, and the positive electrode side bus voltage. The line BUS HOT and the negative electrode side bus voltage line BUS RTN are connected to each other, and the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN are connected to the load 30.

A first capacitor bank C1 for smoothing the bus voltage is connected between the positive electrode side bus voltage line BUS HOT on the upstream side of the load 30 and the negative electrode side bus voltage line BUS RTN. The first capacitor bank C1 is a capacitive power storage element. The battery 40 supplies power to the bus voltage line when the load power required by the load 30 becomes larger than the total generated power of the solar cell arrays 21, 22, ..., 2n, that is, the total output power. The negative electrode side battery voltage line BAT RTN is connected to the negative electrode side bus voltage line BUS RTN. The positive electrode side battery voltage line BAT HOT is connected to a connection point between one end of the discharge circuit 41 and the second current backflow prevention element D2, as will be described later. The battery 40 is a power storage device configured by connecting a plurality of single storage batteries in series and parallel.

Since each of the n-stage power supply control circuits 11, 12, ..., 1n has the same circuit configuration, the following describes the internal circuit configuration in detail, focusing on the first-stage power supply control circuit 11. explain.

A first switch element TR1 and a first resistor R1 connected in series are connected between the positive electrode side power output line SAP HOT and the negative electrode side power output line SAP RTN of the solar cell array 21. Further, a first current backflow prevention element D1 is connected in series on the upstream side and a second resistor R2 is connected in series on the downstream side on the positive electrode side power output line SAP HOT. Further, the downstream side of the second resistor R2 is connected to the output terminal of the power supply control circuit 11 and then connected to the other power supply control circuits 12, ..., 1n, via the positive electrode side bus voltage line BUS HOT. Is connected to the load 30. The negative electrode side power output line SAP RTN is also connected to the output end of the power supply control circuit 11 and then connected to other power supply control circuits 12, ..., 1n, and is loaded via the negative electrode side bus voltage line BUS RTN. Connected to 30.

Further, a discharge circuit 41 for discharging the electric power stored in the battery 40 is connected between the downstream side of the second resistor R2 of the positive electrode side power output line SAP HOT and the positive electrode side battery voltage line BAT HOT. To. Further, it is connected in series between the upstream side of the first current backflow prevention element D1 on the positive electrode side power output line SAP HOT and the positive electrode side battery voltage line BAT HOT to which the negative electrode side terminal of the discharge circuit 41 is connected. The second switch element TR2 and the second current backflow prevention element D2 are connected.

Further, in order to control the fluctuation of the bus voltage supplied to the load 30 within the predetermined allowable voltage fluctuation range, the voltage (potential difference) between the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN. ) Is connected to the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN. The differential voltage between the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN is the bus voltage. The differential amplifier 51 is a circuit that amplifies the bus voltage at a predetermined amplification factor and outputs the result of monitoring the bus voltage.

The output end of the differential amplifier 51 is connected to the input end of each of the two comparators (comparators) of the first comparator 61 and the second comparator 71. The output end of the first comparator 61 is connected to the control end of the first driver 81 that drives the first switch element TR1. The output end of the second comparator 71 is connected to the control end of the second driver 91 that drives the second switch element TR2. The first comparator 61 compares the result of monitoring the differential voltage after being amplified by the differential amplifier 51, that is, the bus voltage, with the first reference voltage allocated in advance for each power supply control circuit. The circuit outputs the comparison result to the first driver 81 as the first control amount. The second comparator 71 compares the result of monitoring the differential voltage, that is, the bus voltage after being amplified by the differential amplifier 51 with the second reference voltage allocated in advance for each power supply control circuit, and compares the result. This is a circuit that outputs the comparison result to the second driver 91 as the second control amount.

The output end of the first driver 81 is connected to the control end of the first switch element TR1, and as the first control amount, the first switch element corresponds to the comparison result output from the first comparator 61. A drive signal for turning TR1 on or off is transmitted to the first switch element TR1. The first switch element TR1 performs a switching operation of shunting or opening the input / output end according to the drive signal transmitted from the first driver 81. That is, this drive signal is a control signal for selecting whether to shunt or open the first switch element TR1.

Similarly, the output end of the second driver 91 is connected to the control end of the second switch element TR2, and as a second control amount, a second control amount is obtained according to the comparison result output from the second comparator 71. The drive signal for turning on or off the switch element TR2 of the above is transmitted to the second switch element TR2. The second switch element TR2 performs a switching operation of closing (short-circuiting) or opening the input / output end according to the drive signal transmitted from the second driver 91. That is, this drive signal is a control signal for selecting whether to close (short-circuit) or open the second switch element TR2.

Further, as a circuit for reducing switching noise (switching noise reduction mechanism which is one of the features of the present invention), it is the closest to the noise generation source at the time of switching operation of the first switch element TR1 or the second switch element TR2. Of the three terminals of the first current backflow prevention element D1 and the first switch element TR1, the low potential side terminals of the input / output terminals other than the control terminal to which the first driver 81 is connected. That is, a second capacitor bank C2 for absorbing and reducing switching noise and a third resistor R3 for damping the resonance level are placed between the negative terminal of the first switch element TR1. It is connected in series. The second capacitor bank C2 is a capacitive power storage element. In FIG. 1, the third resistor R3 is on the positive electrode side and the second capacitor bank C2 is on the negative electrode side for series connection, but the connection order may be reversed.

For reference, examples of specific circuit elements and numerical values of the main components of the power supply control device shown in FIG. 1 are shown below. However, it goes without saying that the power supply control device according to the present invention is not limited to such cases.
(1) First capacitor bank C1: 4900 μF (capacitor)
(2) Second capacitor bank C2: 5 μF (capacitor)
(3) First resistor R1: 1 mΩ, second resistor R2: 1 mΩ, third R3: 1 Ω
(4) First and second switch elements TR1, TR2: MOS field effect transistor (MOSFET: Metal-Oxide-Semiconductor Field Effect Transistor)
(5) First and second current backflow prevention elements D1, D2: Diode

(Explanation of operation of the embodiment)
Next, an example of the operation of the power supply control device shown in FIG. 1 will be described in detail with reference to an example of the voltage waveform image shown in FIG. As described above, FIG. 2 is a characteristic diagram showing an example of a voltage waveform image in the power supply control device shown in FIG. 1, but during shunt (short circuit) operation or open operation of the first switch element TR1. Alternatively, the state of switching noise generated immediately after the closing (short-circuiting) operation or the opening operation of the second switch element TR2 is shown. That is, a voltage waveform image showing the voltage (potential difference) between the positive side bus voltage line BUS HOT and the negative side bus voltage line BUS RTN, that is, the state of the voltage change occurring in the bus voltage, in other words, the first capacitor bank C1. A voltage waveform image showing the state of voltage change occurring in the voltage (potential difference) at both ends is schematically shown. Note that FIG. 2 shows only the AC component excluding the DC component of the bus voltage.

Here, FIG. 2A shows a voltage waveform image of a bus voltage in a conventional power supply control device that does not have the switching noise reduction mechanism shown in FIG. 1 for reference. Further, FIG. 2B shows a second power supply control device of FIG. 1 provided with a switching noise reduction mechanism, which does not include the third resistor R3 of the damping resistor for reducing the resonance level and absorbs the switching noise. The voltage waveform image of the bus voltage in the case where only the capacitor bank C2 is provided is shown. Further, FIG. 2C shows the voltage of the bus voltage in the case of the circuit configuration as shown in the power supply control device of FIG. 1, that is, in the case where not only the second capacitor bank C2 but also the third resistor R3 is provided. A waveform image is shown.

As shown in FIG. 1, the output power of the solar cell array 21 is output to the power supply control circuit 11 via the positive electrode side power output line SAP HOT and the negative electrode side power output line SAP RTN. In the power supply control circuit 11, the first current backflow prevention element D1 and the second resistor R2 are connected in series to the positive electrode side power output line SAP HOT. The output ends on the positive electrode side and the negative electrode side of the power supply control circuit 11 are connected to the first capacitor bank C1. The output of the power supply control circuit 11 is smoothed by the first capacitor bank C1 and then supplied to the load 30 via the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN.

The output power of the solar cell array 21 is the bus voltage (positive electrode side bus voltage line BUS HOT and negative electrode side bus voltage line) supplied to the load 30 by shunting or opening the first switch element TR1 of the power supply control circuit 11. The potential difference with the BUS RTN) is controlled to be within a predetermined allowable voltage range. The details of such control operation will be described below.

In FIG. 1, when the load power required by the load 30 when supplying the output power of the solar cell array 21 to the load 30 is smaller than the generated power of the solar cell arrays 21, 22, ..., 2n, that is, the output power. Since the generated power of the solar cell array 21 cannot be completely consumed on the load 30 side, the potential difference between the positive side bus voltage line BUS HOT and the negative side bus voltage line BUS RTN, that is, the bus voltage rises. The rise in bus voltage is constantly monitored by the differential amplifier 51 in the power supply control circuit 11. The differential amplifier 51 attenuates, amplifies, or offsets the bus voltage, if necessary, and then uses the first comparator 61 and the second comparator 71 as differential voltages appropriately amplified by a predetermined amplification factor. Supply to.

(First operation example)
Next, as a first operation example, an operation when the charged state of the battery 40 is satisfied and the battery 40 does not need to be charged will be described.

The differential voltage input to the first comparator 61 is compared with the first reference voltage allocated in advance for each power supply control circuit, and when the voltage is higher than the first reference voltage, the differential voltage is higher than the first reference voltage. , The output end of the first comparator 61 changes to either High or Low capable of shunting (short-circuiting) the first switch element TR1, and the changed information is a control signal for driver control (described above). It is input to the first driver 81 as the first control amount). The first driver 81 shunts (short-circuits) the first switch element TR1 by applying a drive signal corresponding to the changed information to the control end of the first switch element TR1.

When the first switch element TR1 is shunted (short-circuited), the positive side power output line SAP HOT and the negative side power output line SAP RTN are short-circuited via the first resistor R1, and as a result, the sun The output power of the battery array 21 is not supplied to the load 30. That is, while the first switch element TR1 is shunted (short-circuited), the electric power from the electric charge stored in the first capacitor bank C1 is supplied to the load 30, so that the positive electrode side bus voltage line BUS The potential difference between the HOT and the negative electrode side bus voltage line BUS RTN, that is, the bus voltage drops.

The decrease in bus voltage is constantly monitored by the differential amplifier 51 in the power supply control circuit 11, and as the differential voltage amplified by the differential amplifier 51 (as a result of monitoring the bus voltage), the first comparator 61 and It is input to the second comparator 71.

As described above, the differential voltage input to the first comparator 61 is compared with the first reference voltage allocated in advance for each power supply control circuit, and is a voltage lower than the first reference voltage. When the voltage has dropped to, the output end of the first comparator 61 changes to either Low or High capable of opening the first switch element TR1, and the changed information is used for driver control. Is input to the first driver 81 as a control signal (the first control amount described above). The first driver 81 releases the shunt state of the first switch element TR1 by applying a drive signal corresponding to the changed information to the control end of the first switch element TR1 and changes to the open state. Let me.

When the first switch element TR1 is opened, the positive electrode side power output line SAP HOT and the negative electrode side power output line SAP RTN are released from the short-circuit state via the first resistor R1 and are in an open state. As a result, the output power of the solar cell array 21 is supplied to the load 30 again. That is, when the first switch element TR1 changes to the open state, the operation of supplying the electric power from the electric charge stored in the first capacitor bank C1 to the load 30 is stopped, and the solar cell array 21 is transferred to the load 30. Power supply is restarted. Here, as described above, since the load power required by the load 30 is smaller than the generated power of the solar cell arrays 21, 22, ..., 2n, the solar cell arrays 21, 22, ..., 2n Since the generated power cannot be completely consumed by the load 30, the potential difference between the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN, that is, the bus voltage starts to rise again.

In this way, using the differential amplifier 51, the first comparator 61, and the first switch element TR1, a switching operation based on bang-bang control in which the shunt (short circuit) or opening of the first switch element TR1 is repeated is performed. However, due to the switching operation, the bus voltage repeats rising and falling within the permissible fluctuation range, which is within the predetermined predetermined voltage range, and the bus voltage can be controlled stably. ..

In the above-mentioned first operation example as described above, when the first switch element TR1 performs a shunt or open switching operation, switching noise is generated on the positive electrode side bus voltage line BUS HOT.

That is, when the first switch element TR1 transitions from the open state to the shunt (short circuit) state, the voltage of the positive electrode side power output line SAP HOT drops sharply, and the first current backflow prevention element D1 flows back. Current (ie, recovery current) is generated instantaneously. As in the case of the power supply control circuit by the conventional technique, the switching noise reduction mechanism is not provided, and the series is connected between the downstream terminal of the first current backflow prevention element D1 and the negative electrode side terminal of the first switch element TR1. When the connected second capacitor bank C2 and the third resistor R3 are not connected, the potential of the first capacitor bank C1 suddenly rises due to the recovery current flowing back through the first current backflow prevention element D1. As shown in FIG. 2A, switching noise is generated on the positive electrode side bus voltage line BUS HOT as the current decreases.

As described above, when the permissible voltage fluctuation range between the stages of the constituent stages is extremely narrow due to the recent demand for performance improvement of the power supply control device, the voltage of the first capacitor bank C1 drops sharply. Due to the switching noise that accompanies this, normal voltage control becomes impossible. As a result, although the operation of shunting or opening the first switch element TR1 should be sequentially performed one step at a time, the plurality of solar cell arrays 21, 22, ..., 2n are respectively. Each of the corresponding power supply control circuits 11, 12, ..., 1n shunts or opens at the same time or all at once. Therefore, the bus voltage deviates from the permissible fluctuation range, and as a result, there arises a problem that the control system of the bus voltage becomes unstable operation and a problem that the bus voltage deviates from the permissible voltage fluctuation range.

However, as shown in FIG. 1 as an embodiment of the present invention, the power supply control circuit 11 in the present embodiment includes a first switch element TR1 or a second switch element TR2 as a switching noise reduction mechanism. With the second capacitor bank C2 connected in series between the downstream terminal of the first current backflow prevention element D1 and the negative electrode side terminal of the first switch element TR1 which are closest to the noise generation source during the switching operation. A third resistor R3 is connected. Therefore, when the first switch element TR1 is shunted (short-circuited), the recovery current that flows back to the first current backflow prevention element D1 is generated based on the power stored in the second capacitor bank C2. The electric power of C2 supplied through the resistor R3 of the above and further discharged as a recovery current can be gradually supplied to C2 from the first capacitor bank C1 over time.

As a result, as shown in FIG. 2C, the switching noise generated at both ends of the first capacitor bank C1 can be reduced, in other words, the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS. The potential difference between the RTN and the switching noise superimposed on the bus voltage can be reduced, resonance can be suppressed, and the bus voltage can be stably controlled within the permissible fluctuation range. Become.

Further, in the case of a conventional power supply control device in which the second capacitor bank C2 and the third resistor R3 are not connected when the first switch element TR1 transitions from the shunt (short circuit) state to the open state, When the voltage of the positive electrode side power output line SAP HOT rises sharply and the potential of the first capacitor bank C1 rises sharply, and the first switch element TR1 transitions to the shunt (short circuit) state. Similarly, as shown in FIG. 2A, switching noise is generated on the positive electrode side bus voltage line BUS HOT. As a result, the bus voltage deviates from the permissible fluctuation range, causing a problem that the control system of the bus voltage becomes unstable operation and a problem that the bus voltage deviates from the permissible fluctuation range.

On the other hand, in the power supply control circuit 11 of the present embodiment shown in FIG. 1, as a switching noise reduction mechanism, a downstream terminal of the first current backflow prevention element D1 and a negative electrode side terminal of the first switch element TR1. A second capacitor bank C2 and a third resistor R3, which are connected in series, are connected between the two capacitors. Therefore, even immediately after the first switch element TR1 is opened, as in the case of the shunt (short circuit) of the first switch element TR1, as shown in FIG. 2C, the first capacitor bank C1 The switching noise generated at both ends of the shunt can be reduced, resonance can be suppressed, and the bus voltage can be stably controlled within the permissible fluctuation range.

As a switching noise reduction mechanism, not both the second capacitor bank C2 and the third resistor R3 but the third resistor R3 which is a resonance damping (braking) resistor is not provided, and only the second capacitor bank C2 is provided. As shown in FIG. 2 (B), when the first switch element TR1 performs a shunt (short circuit) / open switching operation, the first capacitor bank C1 and the second capacitor are provided. Resonance occurs between the bank C2 and the inductance component contained in the wiring. As a result, the fluctuation of the bus voltage becomes large, and in some cases, the problem that the bus voltage deviates from the permissible fluctuation range may be caused. Therefore, if the third resistor R3 is used as the resonance damping (braking) resistance and connected in series with the second capacitor bank C2, the resonance level due to the above factors can be damped (braked). It is possible to keep the fluctuation of the bus voltage small.

(Second operation example)
Next, as a second operation example, an operation when the charged state of the battery 40 is insufficient and the battery 40 needs to be charged will be described.

The differential voltage input to the second comparator 71 is compared with the second reference voltage pre-allocated for each power supply control circuit, and if the voltage is higher than the second reference voltage, the differential voltage is higher than the second reference voltage. , The output end of the second comparator 71 changes to either High or Low capable of closing (short-circuiting) the second switch element TR2, and the changed information is a drive signal for driving the driver (described above). Is input to the second driver 91 as the second control amount). The second driver 91 closes (short-circuits) the second switch element TR2 by applying a drive signal corresponding to the changed information to the control end of the second switch element TR2.

When the second switch element TR2 is closed (short-circuited), the positive-side power output line SAP HOT and the positive-side battery voltage line BAT HOT are short-circuited via the second current backflow prevention element D2. As a result, the output power of the solar cell array 21 causes the battery 40 to be charged. On the other hand, while the second switch element TR2 is closed (short-circuited), the output power of the solar cell array 21 is not supplied to the load 30. Therefore, since the power from the electric charge stored in the first capacitor bank C1 is supplied to the load 30, the potential difference between the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN, that is, the bus The voltage drops.

The decrease in the bus voltage is constantly monitored by the differential amplifier 51 in the power supply control circuit 11, and is input to the first comparator 61 and the second comparator 71 as an appropriately amplified differential voltage.

As described above, the differential voltage input to the second comparator 71 is compared with the second reference voltage pre-allocated for each power supply control circuit, and is a voltage lower than the second reference voltage. When the voltage has dropped to, the output end of the second comparator 71 changes to either Low or High capable of opening the second switch element TR2, and the changed information is used for driving the driver. Is input to the second driver 91 as a drive signal (the above-mentioned second control amount). The second driver 91 releases the closed (short-circuited) state of the second switch element TR2 by applying a drive signal corresponding to the changed information to the control end of the second switch element TR2. Change to the open state.

When the second switch element TR2 is opened, the positive side power output line SAP HOT and the positive side battery voltage line BAT HOT are released from being short-circuited via the second current backflow prevention element D2 and are opened. As a result, the output power of the solar cell array 21 is supplied to the load 30 again. That is, when the second switch element TR2 changes to the open state, the operation of supplying the electric power from the electric charge stored in the first capacitor bank C1 to the load 30 is stopped, and the solar cell array 21 is transferred to the load 30. Power supply is restarted. Here, as initially assumed, when the load power required by the load 30 is smaller than the generated power of the solar cell arrays 21, 22, ..., 2n, the generated power of the solar cell arrays 21, 22, ..., 2n is used. Since the load 30 cannot be consumed completely, the potential difference between the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS RTN, that is, the bus voltage starts to rise again.

In this way, using the differential amplifier 51, the second comparator 71, and the second switch element TR2, a switching operation based on bang-bang control is carried out in which the second switch element TR2 is repeatedly shunted (short-circuited) or opened. However, due to the switching operation, the bus voltage repeats rising and falling within the permissible fluctuation range, which is within the predetermined predetermined voltage range, and the bus voltage can be controlled stably. ..

Also in the second operation example as described above, switching noise is generated on the positive electrode side bus voltage line BUS HOT when the second switch element TR2 performs a closing (short circuit) or opening switching operation. ..

That is, when the second switch element TR2 transitions from the open state to the closed (short-circuited) state, the voltage of the positive electrode side power output line SAP HOT drops sharply, and the first current backflow prevention element D1 is moved. A backflow current (ie, recovery current) is generated instantaneously. Unlike the case of the power supply control circuit by the conventional technique, the switching noise reduction mechanism is not provided, and between the downstream terminal of the first current backflow prevention element D1 and the negative electrode side terminal of the first switch element TR1. When the second capacitor bank C2 and the third resistor R3 connected in series are not connected, the potential of the first capacitor bank C1 is raised by the recovery current flowing back through the first current backflow prevention element D1. As shown in FIG. 2A, switching noise is generated on the positive electrode side bus voltage line BUS HOT as the voltage drops sharply.

As described above, due to the recent demand for performance improvement of the power supply control device and the like, the allowable voltage fluctuation range between the stages of the constituent stages is very narrow, so that the voltage of the first capacitor bank C1 drops sharply. Due to the switching noise that accompanies this, normal voltage control becomes impossible. As a result, the operation should normally be closed (short-circuited) or opened one by one in sequence, but it corresponds to each of a plurality of solar cell arrays 21, 22, ..., 2n. The power supply control circuits 11, 12, ..., 1n simultaneously or simultaneously close (short-circuit) or open the second switch element TR2. Therefore, the bus voltage deviates from the permissible fluctuation range, and as a result, there arises a problem that the control system of the bus voltage becomes unstable operation and a problem that the bus voltage deviates from the permissible voltage fluctuation range.

However, as shown in FIG. 1 as an embodiment of the present invention, the power supply control circuit 11 in the present embodiment includes a first switch element TR1 or a second switch element TR2 as a switching noise reduction mechanism. With the second capacitor bank C2 connected in series between the downstream terminal of the first current backflow prevention element D1 and the negative electrode side terminal of the first switch element TR1 which are closest to the noise generation source during the switching operation. A third resistor R3 is connected. Therefore, when the second switch element TR2 is closed (short-circuited), the recovery current that flows back to the first current backflow prevention element D1 is generated based on the power stored in the second capacitor bank C2. The electric power of C2 supplied through the resistor R3 of 3 and further discharged as a recovery current can be gradually supplied to C2 from the first capacitor bank C1 over time.

As a result, as shown in FIG. 2C, the switching noise generated at both ends of the first capacitor bank C1 can be reduced, in other words, the positive electrode side bus voltage line BUS HOT and the negative electrode side bus voltage line BUS. The potential difference between the RTN and the switching noise superimposed on the bus voltage can be reduced, resonance can be suppressed, and the bus voltage can be stably controlled within the permissible fluctuation range. Become.

Further, in the case of a conventional power supply control device in which the second capacitor bank C2 and the third resistor R3 are not connected when the second switch element TR2 transitions from the closed (short-circuited) state to the open state. As the voltage of the positive electrode side power output line SAP HOT rises sharply and the potential of the first capacitor bank C1 rises sharply, the second switch element TR2 transitions to a closed (short-circuited) state. As in the case, as shown in FIG. 2A, switching noise is generated on the positive electrode side bus voltage line BUS HOT. As a result, the bus voltage deviates from the permissible fluctuation range, causing a problem that the control system of the bus voltage becomes unstable operation and a problem that the bus voltage deviates from the permissible fluctuation range.

On the other hand, in the power supply control circuit 11 of the present embodiment shown in FIG. 1, as a switching noise reduction mechanism, a downstream terminal of the first current backflow prevention element D1 and a negative electrode side terminal of the first switch element TR1. A second capacitor bank C2 and a third resistor R3, which are connected in series, are connected between the two capacitors. Therefore, even immediately after the second switch element TR2 is opened, as in the case of closing (short-circuiting) the second switch element TR2, as shown in FIG. 2C, the first capacitor bank Switching noise generated at both ends of C1 can be reduced, resonance can be suppressed, and the bus voltage can be stably controlled within an allowable fluctuation range.

As a switching noise reduction mechanism, not both the second capacitor bank C2 and the third resistor R3 but the third resistor R3 which is a resonance damping (braking) resistor is not provided, and the second capacitor bank C2 is not provided. As shown in FIG. 2B, when the second switch element TR2 performs a closing (short-circuiting) / opening switching operation, the first capacitor banks C1 and the second capacitor banks C1 and the second are used. Resonance occurs between the capacitor bank C2 of the above and the inductance component contained in the wiring. As a result, the fluctuation of the bus voltage becomes large, and in some cases, the problem that the bus voltage deviates from the permissible fluctuation range may be caused. Therefore, if the third resistor R3 is used as the resonance damping (braking) resistance and connected in series with the second capacitor bank C2, the resonance level due to the above factors can be damped (braking), and the bus It is possible to keep the fluctuation of voltage small.

(Other Embodiments of the present invention)
The solar cell arrays 21, 22, ..., 2n shown in FIG. 1 are an example of a power source that generates electric power, and are replaced with another power source having the same function, for example, a solar cell simulating device that simulates a solar cell. You may. Further, in the embodiment shown in FIG. 1, the solar cell arrays 21, 22, ..., 2n and the power supply control device 10 are assumed to be mounted on an artificial satellite, but they are installed on the ground or the like. It goes without saying that it is okay to do so.

Further, in the power supply control device 10 shown in FIG. 1, the first and second current backflow prevention elements D1 and D2 prevent the backflow of current to the corresponding solar cell arrays 21, 22, ..., 2n, respectively. This is a backflow prevention element, and a diode is used as an example, but it may be replaced with another current backflow prevention element having the same function.

Further, in the power supply control device 10 shown in FIG. 1, a MOS field effect transistor (MOSFET) is used as an example of the first and second switch elements TR1 and TR2, but other switch elements are used. Is also good.

Further, in the power supply control device 10 shown in FIG. 1, a capacitor is used as an example of the first and second capacitor banks C1 and C2, but other capacitive power storage elements may be used.

Further, in the power supply control device 10 shown in FIG. 1, the third resistor R3 is placed on the positive electrode side, that is, on the high potential side, and the second capacitor is connected as a connection relationship between the third resistor R3 and the second capacitor bank C2. The bank C2 is arranged and connected to the negative electrode side, that is, the low potential side, but conversely, the third resistor R3 may be connected to the low potential side and the second capacitor bank C2 may be connected to the high potential side. ..

Further, in the power supply control device 10 shown in FIG. 1, the first and second resistors R1 and R2 are connected, but the first and second resistors R1 and R2 are resistors for current detection. When the current detection is unnecessary, or when the current is detected by another method, the first and second resistors R1 and R2 are unnecessary.

Further, in the power supply control device 10 shown in FIG. 1, an example is shown in which one differential amplifier 51 is provided for each of the power supply control circuits 11 to 1n, but the differential amplifier 51 is provided. , Only one may be provided in common to all of the power supply control circuits 11 to 1n, or a plurality (for example, three) may be provided in common to all of the power supply control circuits 11 to 1n. ) May be provided as a majority-decision redundant configuration (for example, a two-thirds redundant configuration).

Further, in the power supply control device 10 shown in FIG. 1, instead of the second comparator 71, the second driver 91, the second switch element TR2, and the second current backflow prevention element D2, a battery charge controller ( It may also be configured to be equipped with a battery charge control device, a battery charge / discharge controller, and a battery charge / discharge control device).

Further, in the power supply control device 10 shown in FIG. 1, the second comparator 71, the second driver 91, the second switch element TR2, the second current backflow prevention element D2, and the discharge circuit 41 are eliminated, and the positive electrode side is eliminated. The battery voltage line BAT HOT and the positive electrode side bus voltage line BUS HOT may be connected.

(Explanation of the effect of the embodiment)
As described in detail above, in the embodiment according to the present invention, the following effects can be obtained.

The first effect is to realize a compact, lightweight, simple circuit configuration and reduction of switching noise in the power supply control device 10 that controls the output power of the solar cell or the solar cell simulation device used as the power generation source. Can be done.

The second effect is that in the power supply control device 10 that controls the output power of the solar cell or the solar cell simulation device used as the power generation source, there are few disadvantages such as an increase in heat generation amount, and switching noise can be reduced. it can.

The present invention can be utilized not only on artificial satellites but also on the ground, and can be applied to, for example, solar cells mounted on buildings, solar cells mounted on vehicle bodies, and the like. For example, by switching and controlling the negative feedback of the electric power generated in the solar cell or the solar cell simulating device, it can be effectively used for the device supplied to the load as a DC-stabilized voltage.

The configuration of a preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely exemplary of the invention and do not limit the invention in any way. Those skilled in the art can easily understand that various modifications and modifications can be made according to a specific application without departing from the gist of the present invention.

10 Power supply control device 11, 12, ..., 1n Power supply control circuit 21, 22, ..., 2n Solar cell array 30 Load 41 Discharge circuit 51 Differential amplifier 61 First comparator 71 Second comparator 81 First driver 91 First driver 91 Driver BAT HOT Positive electrode side battery voltage line BAT RTN Negative electrode side battery voltage line BUS HOT Positive electrode side bus voltage line BUS RTN Negative electrode side bus voltage line C1 First capacitor bank C2 Second capacitor bank D1 First current backflow prevention Element D2 Second current backflow prevention element R1 First resistance R2 Second resistance R3 Third resistance SAP HOT Positive electrode side power output line SAP RTN Negative electrode side power output line TR1 First switch element TR2 Second switch element

Claims (9)

A power supply control circuit that controls power supply to a load is connected to each of the positive electrode side power output line and the negative electrode side power output line of each of the solar cell arrays corresponding to each of the single or multiple solar cell arrays. The positive electrode side power output line and the negative electrode side power output line of the power supply control circuit are connected to each other at the output ends, and are connected to the load as a positive electrode side bus voltage line and a negative electrode side bus voltage line, and are connected to the positive electrode side. A power supply control device in which a first capacitor bank for smoothing the bus voltage supplied to the load is connected between the bus voltage line and the negative electrode side bus voltage line.
Each power control circuit
A first switch element connected between the positive electrode side power output line and the negative electrode side power output line,
It has a first current backflow prevention element connected on the positive electrode side power output line, and further
For reducing switching noise between the downstream terminal of the first current backflow prevention element, which is closest to the noise generation source during the switching operation of the first switch element, and the negative electrode side terminal of the first switch element. With a second capacitor bank connected as
The result of monitoring the bus voltage, which is the potential difference between both ends of the first capacitor bank connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line, and the result allocated to the power supply control circuit in advance. A power supply control device characterized in that the first switch element is shunted or opened according to a comparison result with the first reference voltage. Each power control circuit
Claim 1 is further provided with a resistor connected in series to the positive electrode side or negative electrode side terminal of the second capacitor bank for resonance damping during the switching operation of the first switch element. The power control device described in. A battery that supplies power for the operation of each of the power control circuits is provided.
The positive electrode side terminal of the battery is connected to the positive electrode side power output line via the positive electrode side battery voltage line.
The negative electrode side terminal of the battery is connected to the negative electrode side power output line via the negative electrode side battery voltage line.
Each of the power supply control circuits has a second switch element and a second current backflow connected in series between the positive electrode side power output line and the battery side positive electrode side battery voltage line in order to charge the battery. Further equipped with a prevention element,
The result of monitoring the bus voltage, which is the potential difference between both ends of the first capacitor bank connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line, and the result allocated to the power supply control circuit in advance. The power supply control device according to claim 1 or 2, wherein the second switch element is short-circuited or opened according to a comparison result with the second reference voltage. Each power supply control circuit further comprises a differential amplifier connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line in order to obtain the result of monitoring the bus voltage.
The bus voltage is amplified by the differential amplifier at a predetermined amplification factor, output as a result of monitoring the bus voltage, and compared with the first reference voltage or the second reference voltage. The power supply control device according to claim 3. The fourth aspect of the present invention is characterized in that, instead of being provided for each of the power supply control circuits, only one of the differential amplifiers is provided in common with each of the power supply control circuits, or a plurality of the differential amplifiers are provided in a majority-decision redundant configuration. The power control device described. A second resistor is connected in series with the first current backflow prevention element on the positive electrode side power output line and on the downstream side of the first current backflow prevention element.
In order to discharge the electric power stored in the battery to the positive electrode side power output line, a discharge circuit is connected between the downstream side of the second resistor on the positive electrode side power output line and the positive electrode side battery voltage line. The power supply control device according to any one of claims 3 to 5, wherein the power control device is characterized by the above. The first switch element and the second switch element are configured by using a MOS type electric field effect transistor, and the first current backflow prevention element and the second current backflow prevention element are configured by using a diode. the first capacitor bank and the second capacitor bank power supply control device according to 6 or to claims 3, characterized in that configured using a capacitor. The power supply control device according to any one of claims 1 to 7, wherein a solar cell simulating device simulating a solar cell is used instead of the solar cell array serving as a power source. Power is supplied to the positive electrode side power output line and the negative electrode side power output line of each of the solar cell arrays or each of the solar cell simulation devices in response to each of the single or multiple solar cell arrays or solar cell simulation devices. Each of the power supply control circuits to be controlled is connected, and each of the power supply control circuits is connected to each other at the output ends of the positive electrode side power output line and the negative electrode side power output line, and the positive electrode side bus voltage line and the negative electrode side bus voltage line are connected to each other. As a power supply control device, a first capacitor bank for smoothing the bus voltage supplied to the load is connected between the positive electrode side bus voltage line and the negative electrode side bus voltage line while being connected to the load. And
A battery for supplying power for operating each of the power supply control circuits is provided, a positive electrode side terminal of the battery is connected to the positive electrode side power output line via a positive electrode side battery voltage line, and a negative electrode side terminal of the battery is a negative electrode. Connected to the negative electrode side power output line via the side battery voltage line,
Each power control circuit
A first switch element and a first resistor connected in series between the positive electrode side power output line and the negative electrode side power output line are connected.
A first current backflow prevention element and a second resistor are connected in series to the positive electrode side power output line.
A discharge circuit for discharging the electric power stored in the battery is connected between the downstream side of the second resistor on the positive electrode side power output line and the positive electrode side battery voltage line.
A second switch element and a second current backflow connected in series between the upstream side of the first current backflow prevention element on the positive electrode side bus voltage line and the connection point between the discharge circuit and the battery. Connect with the prevention element,
The input end of the differential amplifier that amplifies the differential voltage between the positive electrode side bus voltage line and the negative electrode side bus voltage line at a predetermined amplification factor is the positive electrode side bus voltage line and the negative electrode side bus voltage line. Connect with and
The output end of the differential amplifier is connected to the input ends of the first comparator and the second comparator, respectively.
The output end of the first comparator is connected to the control end of the first driver that drives the first switch element, and the output end of the second comparator drives the second switch element. Connect to the control end of the driver of 2
The downstream terminal of the first current backflow prevention element, which is the closest to the noise generation source during the switching operation of the first switch element or the second switch element, and the terminal to which the first driver is connected are connected. A second capacitor bank and a third resistor are connected in series between the remaining terminals of the first switch element to be removed and the low potential side terminal.
In the first comparator, the result of comparing the output voltage from the differential amplifier with the first reference voltage pre-allocated to the power supply control circuit is input to the first driver as the first control amount. By doing so, the switching operation of shunting or opening the first switch element is controlled.
And,
In the second comparator, the result of comparing the output voltage from the differential amplifier with the second reference voltage pre-allocated to the power supply control circuit is input to the second driver as the second control amount. A power supply control device characterized by controlling a switching operation of short-circuiting or opening the second switch element.

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