JP6109527B2 - Control device and method, program, and air conditioner provided with the same - Google Patents

Description

  The present invention relates to a control device and method, a program, and an air conditioner including the same.

For example, as a power supply circuit that realizes high efficiency of an air conditioner, a voltage doubler rectifier circuit that boosts an input voltage by a factor of 100 [V] to 200 [V] is used.
In FIG. 1 of Patent Document 1, SW25 connected between one input end of the bridge rectifier circuit 16 and the connection point of the capacitors 17 and 18 in the air conditioner, and the other input end of the bridge rectifier circuit 16 SW26 connected between the connection points of the capacitors 17 and 18 and means for detecting the rotation speed of the compressor of the air conditioner are provided. Based on the information on the compressor rotation speed, SW25 and SW26 A technique for expanding the variable range of the output voltage by switching to a full-wave rectification mode by control and operating in a voltage doubler rectification mode at high rotation is disclosed.

JP 2004-125282 A

  By the way, the case where the outdoor DC fan motor which drives the outdoor fan which ventilates to the outdoor heat exchanger of an air conditioning apparatus is connected to the direct current | flow side of a voltage doubler rectifier circuit as shown in FIG. 1 of the said patent document 1 is examined. Then, when the full-wave rectification mode is switched to the double voltage rectification mode and the DC side voltage is doubled, the applied voltage is doubled even though the command voltage for driving the outdoor DC fan motor has not changed. As a result, the rotational speed of the outdoor DC fan motor rapidly increases, and the outdoor DC fan motor cannot be driven stably.

  However, although Patent Document 1 shows a case where the voltage doubler rectifier circuit is used for driving the compressor motor, a method of using the voltage doubler rectifier circuit and the outdoor DC fan motor in combination is not shown. However, when the voltage doubler rectifier circuit and the outdoor DC fan motor are combined, there is a problem that the outdoor DC fan motor cannot be driven stably.

  This invention is made | formed in view of such a situation, Comprising: The control apparatus and method which can drive an outdoor DC fan motor stably, a program, and an air conditioning apparatus provided with the same are provided. Objective.

In order to solve the above problems, the present invention employs the following means.
The present invention provides a rectifier circuit for converting an AC power supply voltage into a DC voltage, a plurality of capacitors connected in series between output terminals of the rectifier circuit, one input terminal on the AC side of the rectifier circuit, and a first Applied to a power supply device of an air conditioner provided with switching means for switching the rectifier circuit between a full-wave rectifier circuit and a voltage doubler rectifier circuit provided so as to be openable and closable between a connection point of the capacitor and the second capacitor A controller for an outdoor DC fan motor that rotates an outdoor fan that blows air to an outdoor heat exchanger of the air conditioner, wherein the rectifier circuit is configured to perform voltage doubler rectification by closing the switching means. In the case of a circuit, a control device is provided that adjusts the command voltage to be input to the outdoor DC fan motor before the switching means is switched to a closed state.

  According to such a configuration, a rectifier circuit that converts an AC power supply voltage into a DC voltage, a plurality of capacitors connected in series between the output terminals of the rectifier circuit, one input terminal of the rectifier circuit, and the first capacitor And an air conditioner that is provided so as to be openable and closable between the connection point of the second capacitor and a switching unit that switches the rectifier circuit between a full-wave rectifier circuit and a voltage doubler rectifier circuit. Control device for an outdoor DC fan motor that rotates an outdoor fan that blows air to the outdoor heat exchanger of the harmony device, and when the rectifier circuit is a voltage doubler rectifier circuit when the switching means is closed Before the means is switched to the closed state, the command voltage input to the outdoor DC fan motor is adjusted to be reduced.

  Thus, when the command voltage of the outdoor DC fan motor is the same before and after the rectifier circuit is switched from the full-wave rectifier circuit (1 × voltage) to the voltage doubler rectifier circuit (2 × voltage), the outdoor DC Although the rotational speed of the fan motor increases rapidly, in the present invention, the command voltage of the outdoor DC fan motor is changed before the full-wave rectifier circuit (1 × voltage) is switched to the voltage doubler rectifier circuit (2 × voltage). Is reduced, the rotational speed of the outdoor DC fan motor is prevented from rapidly changing (rising). Thereby, a wind noise is reduced and an outdoor DC fan motor can be driven stably.

  In the above control device, the command voltage input to the outdoor DC fan motor is equal to or higher than a stop region where the rotational speed of the outdoor DC fan motor is equal to the rotational speed at which the outdoor DC fan motor stops, and the current outdoor DC fan motor is It is preferable to set the value to be a rotational speed smaller than the rotational speed of the fan motor.

  Thereby, it can adjust so that the rotation speed of an outdoor DC fan motor may not change suddenly, without stopping an outdoor DC fan motor.

In the control device, by adjusting a PWM (Pulse Width Modulation) pulse, a command voltage input to the outdoor DC fan motor is adjusted, and the switching means is switched to a closed state for the PWM pulse. The difference between the pre-switching pulse counter value and the maximum pulse counter value that becomes the stop region may be divided by 2, and the maximum pulse counter value that becomes the stop region may be added to the calculation result.

  The command voltage of the outdoor DC fan motor can be easily adjusted by controlling the PWM pulse.

  This invention provides an air conditioning apparatus provided with the control apparatus in any one of the above.

  The present invention includes a rectifier circuit that converts an AC power supply voltage into a DC voltage, a plurality of capacitors connected in series between output terminals of the rectifier circuit, one input terminal of the rectifier circuit, the first capacitor, Applied to a power supply device of an air conditioner that is provided so as to be openable and closable between a connection point of the second capacitor and includes switching means for switching the rectifier circuit to a full-wave rectifier circuit and a voltage doubler rectifier circuit. A method for controlling an outdoor DC fan motor that rotates an outdoor fan that blows air to an outdoor heat exchanger of the air conditioner, wherein the rectifier circuit is a voltage doubler rectifier circuit by closing the switching means. A control method for adjusting the command voltage to be input to the outdoor DC fan motor before the switching means is switched to the closed state.

  The present invention includes a rectifier circuit that converts an AC power supply voltage into a DC voltage, a plurality of capacitors connected in series between output terminals of the rectifier circuit, one input terminal of the rectifier circuit, the first capacitor, Applied to a power supply device of an air conditioner that is provided so as to be openable and closable between a connection point of the second capacitor and includes switching means for switching the rectifier circuit to a full-wave rectifier circuit and a voltage doubler rectifier circuit. A control program for an outdoor DC fan motor that rotates an outdoor fan that blows air to an outdoor heat exchanger of the air conditioner, wherein the rectifier circuit is turned into a voltage doubler rectifier circuit by closing the switching means. When the switching means is switched to the closed state, the computer is caused to perform a process of adjusting so as to reduce the command voltage input to the outdoor DC fan motor. To provide a control program.

  The present invention has an effect that the outdoor DC fan motor can be driven stably.

It is the figure which showed an example of schematic structure of the power supply device of the air conditioning apparatus which concerns on one Embodiment of this invention. It is the figure which showed an example of the relationship between the command voltage input into an outdoor DC fan motor, and an outdoor DC fan motor.

  Hereinafter, a control device and method, a program, and an air conditioning apparatus including the control device according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram illustrating a schematic configuration of a power supply device 100 of an air-conditioning apparatus according to the present embodiment.
As shown in FIG. 1, a power supply device 100 applied to an air conditioner includes an AC power supply 1, a partial switching type booster circuit (hereinafter referred to as “partial switching circuit”) 2, and a plurality of diodes D1, D2, D3. A first rectifier circuit (rectifier circuit) 3 having D4, a voltage doubler capacitor (first capacitor) C1, a voltage doubler capacitor (second capacitor) C2, and a switching unit (switching means) 4 are provided. .
The AC power source 1 is connected to the AC input side of the first rectifier circuit 3 via the partial switching circuit 2.

  The partial switching circuit 2 includes a reactor L1 inserted in series with one line of the AC power supply 1, and a plurality of diodes D5, D6, D7, D8 between the load side of the reactor L1 and the other lines of the AC power supply 1. The 2nd rectifier circuit 5 which has is provided. Further, an IGBT (Isolated Gate Bipolar Transistor) Q1 is provided on the DC side of the second rectifier circuit 5. Partial switching circuit 2 is connected or disconnected by gate control of IGBT Q1.

  The IGBT Q1 is controlled by receiving a pulse signal that is turned on for a predetermined period in synchronization with the zero cross point of the AC power supply 1. Then, since the current for short-circuiting the AC power supply 1 flows through the second rectifier circuit 5 and the IGBT Q1 via the reactor L1, the input current starts to flow from the zero cross point of the AC power supply 1. When the IGBT Q1 is turned off, the current flows through the reactor L1, the first rectifier circuit 3, and the voltage doubler capacitors C1 and C2. As a result, the current conduction angle can be greatly increased, and the power factor can be improved.

  The partial switching circuit 2 accumulates energy in the AC reactor L1 when the IGBT Q1 is turned on at a predetermined timing of a half cycle of the voltage of the AC power supply 1, and when the IGBT Q1 is turned off after a predetermined time has elapsed, The voltage due to the back electromotive force generated by the energy accumulated in the AC reactor L1 and the voltage of the AC power supply 1 are added and applied to the second rectifier circuit 5 for boosting. The partial switching circuit 2 operates only in the operation region where the AC power supply voltage needs to be boosted.

The first rectifier circuit 3 forms a rectifier circuit with a plurality of diodes, and converts the AC power supply voltage supplied from the AC power supply 1 into a DC voltage. Between the output terminals of the first rectifier circuit 3, two voltage doubler capacitors C1 and C2 are connected in series.
The switching unit 4 is provided between the connection point (middle point) of the voltage doubler capacitors C1 and C2 and one end on the AC side of the first rectifier circuit, and can be opened and closed. The switching unit 4 sets the connected state based on the close switching command acquired from the control device 10 and sets the disconnected state based on the open switching command acquired from the control device 10.
When the switching unit 4 is opened, the first rectification circuit 3 is a full-wave rectification circuit, and when the switching unit 4 is closed, the first rectification circuit 3 is a voltage doubler rectification circuit. In this way, the full-wave rectifier circuit and the voltage doubler rectifier circuit can be switched.

As shown in FIG. 1, the power supply device 100 of the present embodiment is connected to an inverter 6 that drives the compressor motor 7 and an outdoor DC fan motor 8. Further, the power supply device 100 and the outdoor DC fan motor 8 are connected to the control device 10 so as to be able to exchange various information.
The inverter 6 is an inverter that outputs a variable frequency by predetermined control, and a compressor motor 7 that drives a compressor (not shown) of the air conditioner is driven by this output.
The outdoor DC fan motor 8 drives an outdoor fan that blows air to the outdoor heat exchanger of the air conditioner based on the command voltage acquired from the control device 10. Information on the rotational speed of the outdoor DC fan motor 8 is fed back to the control device 10. Thereby, the control apparatus 10 can also adjust a command voltage based on the information of the fed back rotation speed.

Here, when the voltage between terminals connected to the outdoor DC fan motor 8 is Vo and the voltage of the AC power supply 1 is Vi, the switching unit 4 is opened, and the first rectifier circuit 3 is a full-wave rectifier circuit. In this case, the following equation (1) is established for Vo and Vi.
Vo = √2Vi (1)
When the switching unit 4 is closed and the first rectifier circuit 3 is a voltage doubler rectifier circuit, the following equation (2) is established for Vo and Vi.
Vo = 2√2Vi (2)

  As shown in FIG. 1, the DC voltage plus terminal of the outdoor DC fan motor 8 is connected to a line connected to the voltage doubler capacitor C1, and the DC voltage minus terminal of the outdoor DC fan motor 8 is a voltage doubler capacitor. It is connected to a line connected to C2.

  The control device 10 includes, for example, a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory), a computer-readable recording medium, and the like. A series of processing steps for realizing various functions to be described later is recorded on a recording medium or the like in the form of a program (for example, a control program), and the CPU reads the program into a RAM or the like to process and process information. Various functions described later are realized by executing the arithmetic processing.

Specifically, the control device 10 adjusts the command voltage to be input to the outdoor DC fan motor 8 before the switching unit 4 is switched to the closed state (for example, several milliseconds before). Specifically, in the control device 10, the command voltage input to the outdoor DC fan motor 8 is equal to or greater than a stop region where the rotational speed of the outdoor DC fan motor 8 is the rotational speed at which the outdoor DC fan motor 8 stops. The rotation speed is set to a value that is smaller than the current rotation speed of the outdoor DC fan motor 8. The command voltage input from the control device 10 to the outdoor DC fan motor 8 is adjusted by the PWM pulse.
For example, the PWM pulse to be adjusted is calculated by the following equation (3).
Post-switching pulse counter value = {(pre-switching pulse counter value) − (maximum pulse counter value for stop region)} / 2+ (maximum pulse counter value for stop region) (3)

  In the example of the above formula (3), an intermediate point between the rotation speed that is higher than the rotation speed at which the outdoor DC fan motor 8 stops and the rotation speed smaller than the current rotation speed of the outdoor DC fan motor 8 is adopted. By performing (that is, dividing by 2), the post-switching pulse counter value is calculated, but the number of rotations to be reduced is not limited. However, by dividing by 2 and adopting the rotational speed of the intermediate point of the pulse counter that can drive the outdoor DC fan motor 8, the rotation of the outdoor DC fan motor 8 before and after switching from 1 × pressure to 2 × pressure. Number can be maintained.

  The PWM pulse output from the control device 10 is smoothed by the capacitor C3, becomes a stable voltage, and is input to the outdoor DC fan motor 8 as a command voltage.

  FIG. 2 shows the counter value (counter value: 0 to 255) of a PWM pulse for giving a command voltage to the outdoor DC fan motor 8 on the horizontal axis, and the rotational speed [rpm] of the outdoor DC fan motor 8 on the vertical axis. Yes. When the outdoor DC fan motor 8 according to the present embodiment is used, it is indicated that the outdoor DC fan motor is not driven and is in a stop region in the section where the counter value is 0 to 130. When the counter value is 130 or later, the outdoor DC fan motor 8 is driven at the number of revolutions indicated by the solid line when the rectifier circuit is used with a double voltage (full-wave rectifier circuit), and the double voltage rectifier circuit (double voltage rectifier circuit). ) Indicates that the outdoor DC fan motor 8 is driven at the rotational speed indicated by the dotted line.

  In the present embodiment, the maximum counter value serving as the stop region is 130, but FIG. 2 shows an example of the outdoor DC fan motor used in the present embodiment, and the maximum counter value is limited to this. First, it is determined by the fan motor to be used.

Next, the operation of the control device 10 according to the present embodiment will be described with reference to FIGS. 1 and 2.
When the switching unit 4 is in an open state (disconnected state) and the rectifier circuit 3 is a full-wave rectifier circuit, both ends of the capacitors for voltage doublers C1 and C2 connected in series are subjected to a full-wave rectified voltage. Charged and 1-fold voltage rectification is performed. At this time, when the counter value of the PWM pulse for controlling the command voltage output from the control device 10 is 190, the rotational speed of the outdoor DC fan motor 8 is the point A before switching indicated by the 1 × pressure line. The number of revolutions.

  In the case where the control by the control device 10 according to the present invention is not performed, a close switch command is output from the control device 10 to the switching unit 4 when the switching unit 4 is in a closed state, and the switching unit 4 is closed. The state (connection state) is entered, and the first rectifier circuit 3 is made a voltage doubler rectifier circuit. Although both ends of the voltage doubler capacitors C1 and C2 are rectified twice, the PWM pulse counter value remains the same as 190 before switching from the 1 × voltage to the 2 × voltage, so that the outdoor DC fan motor 8 The number of revolutions rapidly increases to the number of revolutions at the point B after switching shown in the double pressure line.

  On the other hand, the case where control by the control apparatus 10 of this invention is made is demonstrated. Based on the above equation (3), when the switching unit 4 is in a closed condition, before the closing switch command is output from the control device 10 to the switching unit 4 (for example, several milliseconds). The PWM pulse counter value after switching from the double pressure to the double pressure is calculated (for example, (190−130) / 2 + 130 = 160), and the calculated PWM pulse counter value (for example, 160) is used as the outdoor DC fan motor 8. Given to the side.

  Thereafter, a closing switching command is output from the control device 10 to the switching unit 4. At this time, the outdoor DC fan motor 8 has already been controlled so that the PWM pulse counter value is controlled to 160 and the command voltage is reduced from before the change from the 1-fold pressure to the 2-fold pressure. The rotation speed of the motor 8 is the rotation speed at the point C after switching indicated by the double pressure line. As described above, the command voltage (PWM pulse counter value) of the outdoor DC fan motor 8 is adjusted to be reduced to half the rotation speed of the usable area before switching from the 1 × pressure to the 2 × pressure. The rotational speed of the outdoor DC fan motor 8 can be maintained at the rotational speed before switching.

As described above, according to the control device 10 and the method, the program, and the air conditioner including the control device 10 according to the present embodiment, the first rectifier circuit 3 is doubled from the full-wave rectifier circuit (single pressure). By reducing the command voltage of the outdoor DC fan motor 8 before switching to the voltage rectifying circuit (double voltage), the rotational speed of the outdoor DC fan motor 8 is prevented from rapidly increasing. Thereby, a wind noise is reduced and an outdoor DC fan motor can be driven stably.
The command voltage input to the outdoor DC fan motor 8 is equal to or greater than the stop region where the rotational speed of the outdoor DC fan motor 8 is the rotational speed at which the outdoor DC fan motor 8 stops. Since the rotation speed is set to a value smaller than the rotation speed, the outdoor DC fan motor 8 can be adjusted so as not to change suddenly without stopping the outdoor DC fan motor 8.

3 First rectifier circuit 4 Switching unit 8 Outdoor DC fan motor 10 Control device 100 Power supply device C1, C2 Double voltage capacitor

Claims (6)

A rectifier circuit for converting an AC power supply voltage into a DC voltage; a plurality of capacitors connected in series between output terminals of the rectifier circuit; one input terminal on the AC side of the rectifier circuit; the first capacitor; 2 is applied to a power supply device of an air conditioner, which is provided so as to be openable and closable between connection points of the capacitor, and includes switching means for switching the rectifier circuit to a full-wave rectifier circuit and a voltage doubler rectifier circuit, A control device for an outdoor DC fan motor that rotates an outdoor fan that blows air to an outdoor heat exchanger of an air conditioner,
When the switching means is closed, the command voltage input to the outdoor DC fan motor is reduced before the switching means is switched to the closed state when the rectifier circuit is a voltage doubler rectifier circuit. Control device to adjust to.   The command voltage input to the outdoor DC fan motor is equal to or higher than a stop region where the rotational speed of the outdoor DC fan motor is the rotational speed at which the outdoor DC fan motor stops, and the current rotational speed of the outdoor DC fan motor The control device according to claim 1, wherein the control device is set to a value that results in a smaller rotational speed. The command voltage input to the outdoor DC fan motor is adjusted by adjusting the PWM pulse. The PWM pulse includes a pre-switching pulse counter value at which the switching unit is switched to a closed state, and a maximum pulse counter serving as a stop region. 3. The control device according to claim 1 , wherein a difference from the value is divided by 2 and a value obtained by adding a maximum pulse counter value serving as the stop region to the calculation result is set .   An air conditioning apparatus provided with the control apparatus in any one of Claims 1-3. A rectifier circuit for converting an AC power supply voltage to a DC voltage; a plurality of capacitors connected in series between output terminals of the rectifier circuit; one input terminal of the rectifier circuit; the first capacitor; and the second capacitor The air conditioner is applied to a power supply device of an air conditioner that is provided so as to be openable and closable between connection points of a capacitor and includes a switching unit that switches the rectifier circuit between a full-wave rectifier circuit and a voltage doubler rectifier circuit. A method of controlling an outdoor DC fan motor that rotates an outdoor fan that blows air to the outdoor heat exchanger,
When the switching means is closed, the command voltage input to the outdoor DC fan motor is reduced before the switching means is switched to the closed state when the rectifier circuit is a voltage doubler rectifier circuit. Control method to adjust to. A rectifier circuit for converting an AC power supply voltage to a DC voltage; a plurality of capacitors connected in series between output terminals of the rectifier circuit; one input terminal of the rectifier circuit; the first capacitor; and the second capacitor The air conditioner is applied to a power supply device of an air conditioner that is provided so as to be openable and closable between connection points of a capacitor and includes a switching unit that switches the rectifier circuit between a full-wave rectifier circuit and a voltage doubler rectifier circuit. A control program for an outdoor DC fan motor that rotates an outdoor fan that blows air to the outdoor heat exchanger,
When the switching means is closed, the command voltage input to the outdoor DC fan motor is reduced before the switching means is switched to the closed state when the rectifier circuit is a voltage doubler rectifier circuit. A control program for causing a computer to execute a process for making adjustments.

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