JP2959634B2 - Power control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a power control system using an optical fiber link for a return path, and more particularly to a power control system for transmitting information by a multi-wavelength optical communication system. is there.

[Conventional technology]

Conventionally, a power supply control system using an optical fiber as a sense line is configured as shown in FIG.

FIG. 5 is a block diagram showing one embodiment of a conventional power supply control system, which is constituted by a voltage regulator for maintaining a constant voltage at both ends of a load. In the figure, 101 is power control means for receiving and controlling DC power and outputting a specified voltage, 102 is power transmission means for supplying output power of the power control means to a load 103, 103 is a load, and 104 is a load. Load voltage detecting means for detecting the voltage between both ends of 103 and generating and sending first voltage information; 105 is for converting the first voltage information detected by the load voltage detecting means 104 into optical information; Light-to-light conversion means, 106 is an optical transmission means for transmitting the optical information obtained by the light-to-light conversion means 105, and 107 is the light transmission means 1.
The photoelectric conversion means for converting the optical information transmitted by the signal 06 into the second voltage information. The photoelectric conversion means 108 controls the power control means 101 by comparing the second voltage information with a reference value to generate a specified voltage. Feedback control means for performing

In the figure, the power control unit 101 controls the transmitted power in an analog manner or in a digital manner. In the case of controlling in an analog manner, the power control means 101 is an array of analog type voltage controlled resistance elements comprising one or more transistors, and the feedback control means 108 controls the power control means 101 in an analog manner. It is a means for doing. On the other hand, in the case of digital control, the power control means 101 is an array of digital width modulation type voltage control switch elements comprising one or more transistors, and the feedback control means
Numeral 108 denotes means for digitally controlling the on-time width of the power control means 101.

In either analog or digital control, the one or more transistors are configured as bipolar transistors, MOS field effect transistors, or dielectric induction transistors. In the case of the analog type, each transistor performs an analog operation, and therefore, considering the sum of the DC voltage applied to both ends of the load 103 and the DC voltage causing loss in the power transmission means 102, the DC voltage on the power line 109 is considered. The difference between the input voltage and the sum voltage is applied to the transistor constituting the power control means 101. Since the sum voltage changes when the loss voltage of the power transmission means 102 changes, the voltage applied to the transistor must be large enough to cause the transistor to perform analog operation in the operation state of the stabilized power supply. Therefore, the loss of each transistor increases.

On the other hand, in the case of the digital type, since the conduction angle of each transistor is controlled by the feedback control means 108,
The loss as in the above-described analog operation method does not occur in each transistor.

In the configuration shown in FIG. 5, the power transmission means 102 comprises a pair of conducting wires or cables. The power transmission means 102 and the light transmission means 106 may be housed in a sheath to form a sheath cable.

The load voltage detecting means 104 is constituted by, for example, a differential amplifier circuit capable of inputting one end 103a of the load 103 to one input terminal and inputting the other end 103b of the load 103 to another input terminal. A DC voltage generated at both ends and a fluctuation component thereof are detected, and these signals are sent to the electro-optical conversion means 105 as a broadband signal including a DC component.

The electro-optical conversion means 105 modulates the first voltage information by the first carrier signal to generate a first modulated electric signal, and generates a modulated optical signal by the first modulated signal. And a light-emitting means for generating a second modulated electric signal from the modulated optical signal received via the optical transmission means 106; And demodulating means for generating second voltage information from the second modulated electric signal generated by the means.

The modulation means of the voltage conversion means 105 converts the first voltage information into a width modulation pulse signal, an amplitude modulation pulse signal, a period modulation pulse signal, a code modulation pulse signal, or an A / D conversion signal. using a v-f conversion circuit,
The output can be output as a periodic modulation pulse signal.

When a signal representing the voltage at both ends of the load 103 is input from the load voltage detecting means 104, the output frequency of the v-f conversion circuit changes according to the input signal. The output of the v-f conversion circuit is applied to a period modulation pulse generation circuit, and the pulse is shaped to generate a period modulation pulse. In a periodically modulated pulse generating circuit that obtains a periodically modulated pulse whose frequency increases when a positive input signal is applied to the v-f converter and decreases when a negative input signal is applied, the pulse width and the period are different. A square wave signal that changes together is obtained. This square wave signal is applied to a semiconductor light emitting diode, a semiconductor laser diode, or other light emitting means capable of modulating an optical signal. Usually, these light emitting means are modulated by a current intensity modulation method, so that a pulsed light emission output is obtained.

The optical signal thus obtained is applied to the photoelectric conversion means 107 via the optical transmission means 106 comprising a graded index optical fiber, a plastic optical fiber or the like.
Since the optical transmission means 106 is used as a sense signal line, the influence of electromagnetic waves such as high-frequency signals can be completely eliminated.

The optical signal transmitted via the optical transmission unit 106 is received by a photoelectric conversion unit 107 including a light receiving unit and a demodulation unit, and is converted into an electric pulse signal corresponding to a pulsed optical output.

The light receiving means includes a semiconductor PIN photodiode, a semiconductor avalanche photodiode, or the like, and the periodic modulation pulse signal converted into an electric pulse signal by the light receiving means is input to the demodulation means.

The demodulation means includes a v-f converter and a DC amplifier. The fv conversion circuit may be of, for example, an integration type, a discriminator type, or a PLL type. The DC amplifier circuit amplifies the output of the fv conversion circuit to an extent that the feedback control means 108 does not malfunction, and also increases the feedback loop gain.

In a DC current stabilizing device for stabilizing a DC current, a load current detecting means is used instead of the load voltage detecting means 104.

The load current detecting means 104 is for detecting the DC current flowing through the load and its fluctuation component, and sending out these signals from the electro-optical conversion means 105 as a broadband signal including the DC component. The load current detection means includes, for example, a load current detection circuit including a differential amplifier circuit capable of inputting one end of a load to one input terminal and inputting the other end of the power transmission means to another input terminal; And a resistor having a low resistance value that can be ignored.

[Problems to be solved by the invention]

In the power control method using the above-described conventional optical fiber link as a sense line, since the optical fiber link is used, even when the power supply control unit and the load are installed apart from each other, the voltage or the voltage is stable and accurate. Although the current can be controlled, there is a disadvantage in that only a signal having a much smaller capacity than the amount of information allowed in the optical fiber link is transmitted.

On the other hand, in the wiring between boards of electronic devices and the like, since a large amount of wire harnesses are arranged in a narrow space, it is desirable to increase the amount of information that can be put on one line as much as possible. Further, from the necessity of reducing the weight and cost, it is strongly desired to greatly reduce the amount of the wire harness.

Further, in the conventional power supply control method, since the power supplied to the entire load is generally controlled by keeping the voltage across the load or the current flowing through the load constant, even if only a part of the load becomes unfavorable, It is extremely difficult to detect from the power supply control side. For example, if the current of the entire load is 10 A, and the current capacity of the part with a small load withstand capacity is 10 mA, even if the current of the 10 mA part increases to 1 A, no abnormality is generally recognized from the power supply side There is a disadvantage that.

On the other hand, the reliability and stability of the load are also restricted by the temperature rise of the entire load.For example, even if the load is heated and exceeds the allowable temperature rise limit, the conventional method directly There is a disadvantage that it cannot be detected.

The present invention is to solve the above problems, in the power supply control system of the system of controlling the feedback signal through the optical fiber using an optical fiber link to the sense line,
The reliability of the load is increased by inserting and transmitting optical information of multiple wavelengths at the same time to the transmitter and receiver ends of the optical fiber to increase the amount of feedback information. It is an object of the present invention to provide a power supply control system that can be operated safely and reliably.

[Means for solving the problem]

For this purpose, the power supply control method of the present invention arranges a plurality of sets of corresponding power supplies and loads, detects the voltage or current on the load side of each set, converts the detection signal into an optical signal, and returns the signal through the shared optical transmission means. A power supply control method in which the power supply is controlled by converting an optical signal into an electric signal on the power supply side of each set, and a detection means for detecting a state of a load of each set, and a detection signal by the detection means. A plurality of light-to-light conversion means for converting light signals of different wavelengths are provided, and a plurality of light-to-light conversion means for converting light signals of different wavelengths to electric signals are provided on the power supply side of each set in correspondence with the light-to-light conversion means. A multiplexing means is provided at the transmission end of the optical transmission means, and a demultiplexing means is provided at the reception end, and optical signals of different wavelengths from each set of electro-optical conversion means are combined by the multiplexing means and passed through the shared optical transmission means. Multiplex transmission and before Different wavelengths of light signals at demultiplexing means receiving end and respectively demultiplexing is characterized in that so as to convert into an electric signal by the photoelectric conversion means each set.

[Action]

According to the power supply control method of the present invention, various states of a load are detected by a plurality of detectors, converted into optical signals of different wavelengths, and these optical signals are multiplexed and transmitted to the power supply side to be separated into respective optical signals. Then, power control is performed based on a plurality of pieces of detection information. By doing so, the state of the load can be monitored in detail, and the power can be easily cut off, limited, or reduced as needed, so that the reliability of the device can be improved. If two or more power supply control devices are configured to share a single optical fiber sense line, the wire harness can be simplified and stabilized.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a power supply control system according to the present invention. In the figure, 1 is power control means, 2 is power transmission means, 3 is load, 4 is load voltage / current detection means, 5
Is light-to-light conversion means, 6 is light transmission means, 7 is photoelectric conversion means,
Reference numeral 8 denotes feedback control means, 9 denotes multiplexing means, 10 denotes demultiplexing means, 11 denotes sensing means, 12 denotes second light-to-light conversion means, 13 denotes second photoelectric conversion means, and 14 denotes alarm means.

In the figure, power control means 1, power transmission means 2,
A load 3, a load voltage / current detection unit 4, an electro-optical conversion unit 5, a multiplexing unit 9, an optical transmission unit 6, a demultiplexing unit 10,
The photoelectric conversion means 7 and the feedback control means 8 form a normal feedback type DC power supply stabilizing device. The load voltage / current detecting means 4 operates as load voltage detecting means for detecting the voltage between both ends of the load 3 if necessary, or converts the current flowing through the load 3 to a very small value generated at both ends of a resistor having a small value. It is detected by current. In either case, the purpose is to keep the voltage across the load 3 constant or keep the current flowing through the load 3 constant.

The sensing means 11 senses status information of the load 3 and senses, for example, a current flowing through a part of the load 3 or a temperature rise of the load 3.

FIG. 2 is a circuit diagram showing an example in which a power type npn transistor is included in a part of the load 3. FIG. 2 (a) shows a case where an emitter current is detected, and FIG. 2 (b) shows a case where a collector temperature is detected. Is shown. In the figure, 21 is a power type npn transistor, 22 is an emitter resistor of the npn transistor 21, 23 is a resistor having a small value for detecting the emitter current of the npn transistor 21, 24 is platinum / constantan, or alumel / chromel. It is a temperature sensor by joining.

In FIG. 2A, the sensing means 11 monitors whether the emitter current of the npn transistor 21 exceeds the specified range and the voltage across the resistor 23 exceeds the specified voltage. On the other hand, in FIG. 2B, the sensing means 11 monitors whether or not the collector temperature of the npn transistor 21 exceeds the allowable maximum by the temperature sensor 24. The signal input to the sensing means 11 is not limited to the above-described emitter current or collector temperature, but is not limited as long as it is information that can be converted into an electric signal output, such as voltage, current, temperature, and light quantity.

The electric signal output of the sensing means 11 is converted into optical information through a second electro-optical conversion means 12 as shown in FIG. 1, and then is inputted to the multiplexing means 9, and the output of the multiplexing means 9 is optical transmission. The signal is input to the demultiplexing means 10 via the output 6. The optical information output of the demultiplexer 10 is converted into an electric signal via the second photoelectric converter 13 and input to the alarm 14. The warning means 14 determines whether the sensed information is out of the permissible range or the permissible range including the specified value, and outputs an alarm signal if out of the permissible range. The alarm signal output from the alarm means 14 is input to the power control signal 1, and the output power supplied to the load is cut off, limited, or reduced by the load power monitoring control means 15 incorporated in the power control means 1 in FIG. .

FIG. 3 is a block diagram showing the configuration of the power control means shown in FIG. In the figure, reference numeral 15 denotes load power monitoring and control means, 16 is a comparator, 17 is a Zener diode, and 18 is a controller.

The load power monitoring control means inputs a control signal to the controller 18 at any time based on information such as the temperature state of the load, the vibration state, the presence or absence of smoke, and the like, and the input from the feedback control means 8 and the zener diode 17 The set value is compared with the set reference value, and the difference signal is similarly input to the controller as a control signal. The controller 18 controls the output voltage and the output current by these control inputs, and controls the power supply to the load.

The multiplexing means 9 shown in FIG. 1 is a device having, for example, three input ports and one output port, and each of the input ports is a bandpass filter for passing an optical input signal having a different wavelength. It has the characteristic as follows. The output port simultaneously multiplexes and outputs optical signals of different wavelengths applied to each input port.

The demultiplexing means 10 shown in FIG. 1 is a device having, for example, one input port and three output ports. When an optical signal having a plurality of wavelengths is added to the input port, each output port becomes It has characteristics as a bandpass filter for simultaneously outputting input signals of different wavelengths.

Although the multiplexing means 9 and the demultiplexing means 10 in FIG. 1 each have three input ports and three output ports, the number is not limited to three, but is not limited to two. It goes without saying that an individual is acceptable.

In FIG. 1, a first input port of the multiplexing means 9 has a band characteristic of passing an optical signal having a wavelength λ ₁ corresponding to a first output port of the demultiplexing means 10, and a first output port of the multiplexing output 9. The second input port has a band characteristic of passing an optical signal of wavelength λ ₂ corresponding to the second output port of the demultiplexed output 10, and the third input port of the multiplexed output 9 has the third input port of the demultiplexed output 10. It has a band characteristic for passing an optical signal of wavelength input λ3 corresponding to the output port of _No.3 .

The light transmitting means 6 can be a GI type or step index type multi-mode optical fiber cable, a single mode optical fiber cable, or a plastic optical fiber cable, but is not limited thereto. It may be a transmission system or a waveguide transmission system formed by a mirror or the like.

Arbitrary load-side information can be input to the third input port of the multiplexing means 9. For example, when the load 3 includes a relatively large device or a mechanical part including a movable part, these states can be photographed by a CCD camera and transmitted from the load side to the power control side as image information.
In this case, the information obtained from the third output port of the demultiplexer 10 may be photoelectrically converted and then connected to an image monitor. Further, the image information may be temperature information captured by an infrared camera. In such a case, a profile of a temperature rise caused by the load 3 can be obtained as the image information. In addition, in addition to this, a smoke detector is arranged near the load to detect the presence or absence of smoke, or to detect various signals such as actuator position information, electromagnetic wave intensity, etc., and send them to the power supply as control information. You may make it transmit.

FIG. 4 is a block diagram showing another embodiment of the power supply control system according to the present invention, wherein reference numerals 31 and 41 denote power control means, 32 and 42, respectively.
Are power transmission means, 33 and 34 are loads, 34 and 44, respectively.
Are load voltage / current detection means, 35 and 45 are electro-optical conversion means, 36 is light transmission means, 37 and 47 are photoelectric conversion means, 38 and 48 are feedback control means, 51 is multiplexing means, 52
Is a branching means.

FIG. 4 shows a system in which the light transmission means 36 constituting the sense line is shared when two stabilized power supplies are used. In FIG. 4, the multiplexing means 51 and the demultiplexing means 52 are shared by two stabilized power supplies.

A power control means 31, a power transmission means 32, a load 33, a load voltage / current detection means 34, an electro-optical conversion means 35, a multiplexing means 51, an optical transmission means 36, a demultiplexing means 52, Conversion means
37 and the feedback control means 38 constitute a first feedback type DC power supply stabilizing apparatus, and the power control means 41 and the power transmission means 42
, Load 43, load voltage / current detection means 44, light-to-light conversion means 45, multiplexing means 51, light transmission means 36, demultiplexing means 52
, The photoelectric conversion means 47, and the feedback control means 48 constitute a second feedback type DC power supply stabilizing device.

The first and second feedback DC power stabilizers operate as shown in the first embodiment, respectively. In this embodiment, two power supply control devices are dealt with. However, if the number of input ports of the multiplexing means and the number of output ports of the multiplexing means are increased, the number of power supply controls corresponding to the number of these ports is increased. Devices can be connected in parallel and operated simultaneously. Also, if there is a margin for the number of input ports of the multiplexing means and the number of output ports of the demultiplexing means, in addition to sharing the light transmission means by a plurality of power supply control devices, status monitoring information of these devices, power cutoff, It goes without saying that the information can be shared by control information for performing control including restriction or reduction.

〔The invention's effect〕

As described above, according to the present invention, in a power supply control system in which a control signal is feedback-controlled through an optical fiber by using a fiber link for a sense line, a multiplexer is provided at each of a transmitting end and a receiving end of the optical fiber. By inserting a duplexer and transmitting and returning optical information of multiple wavelengths at the same time, a great deal of information about the load can be obtained. Because you can easily cut off, limit or reduce power,
Since the reliability of the device can be improved, and two or more power supply control devices can be configured by sharing a sensor line using one optical fiber, there is an effect that the wire harness is simplified and stability is not impaired. . Further, there is an effect that various information other than the optical fiber sense line information can be passed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a power supply control system according to the present invention, FIG. 2 is a block diagram showing a relationship between a sensing means and a load shown in FIG. 1, and FIG. FIG. 4 is a block diagram showing the configuration of the power control means of FIG.
FIG. 5 is a block diagram showing an example of a conventional power supply control method. DESCRIPTION OF SYMBOLS 1 ... Power control means, 2 ... Power transmission means, 3 ... Load, 4 ... Load voltage / current detection means, 5 ... Electro-optical conversion means, 6 ... Light transmission means, 7 ... Photoelectric conversion means, 8 feedback control means 9 multiplexing means 10 demultiplexing means 11
Sense means, 12 second light-electric conversion means, 13 second photoelectric conversion means, 14 alarm means.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 10/00-10/28 G05F 1/10-1/56

Claims (5)

(57) [Claims] 1. A plurality of sets of corresponding power supplies and loads are provided, a voltage or a current on the load side of each set is detected, a detection signal is converted into an optical signal and fed back through a common optical transmission means. A power supply control method in which an optical signal is converted into an electric signal on a power supply side to control a power supply, and a detection means for detecting a state of each set of loads and optical signals of different wavelengths respectively detected by the detection means. A plurality of photoelectric conversion means for converting optical signals of different wavelengths into electric signals respectively on the power supply side of each set, and a transmitting end of the shared optical transmission means. Multiplexing means,
Demultiplexing means are provided at the receiving end, respectively, and optical signals of different wavelengths from each electro-optical conversion means of each set are combined by the multiplexing means and multiplexed and transmitted through the shared optical transmission means. A power supply control method characterized in that optical signals of different wavelengths are respectively demultiplexed and converted into electric signals by each set of photoelectric conversion means. 2. The power supply control according to claim 1, wherein an output of at least one photoelectric conversion unit is input to an alarm unit, and control such as cutoff or limitation of supplied power is performed by the alarm output. method. 3. The power supply control method according to claim 1, wherein at least one of the detection means is an infrared camera, and detects and feeds back a temperature state of the load to control a power supply. 4. The power supply control method according to claim 1, wherein an output of at least one photoelectric conversion means is input to a monitor and imaged. 5. The power supply control system according to claim 1, wherein the multiplexing means has a plurality of input ports and one output port, and the demultiplexing means has one input port and a plurality of output ports.