JP2012239289A - Control device for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an air conditioner that shortens a test time on a production line.SOLUTION: The control device for an air conditioner includes: a rectification circuit 7 for rectifying a commercial AC voltage; a smoothing capacitor 9 for smoothing the voltage rectified by the rectification circuit 7 to a DC bus voltage; an inverter section 11 for converting the DC bus voltage to an AC voltage of an arbitrary frequency to drive a compressor motor 12; a transformer 10 for generating a control supply voltage from the DC bus voltage; and a control section 8 operable on the control supply voltage to control the drive of the inverter section 11 at an external command. The control section 8 continuously performs restrained compressor motor energization of applying a low torque insufficient to operate the compressor motor 12 at an external restrained compressor motor energization command.

Description

  The present invention relates to a control device for an air conditioner.

  An air conditioner control apparatus controls a converter unit that converts AC power supplied from an AC power source into DC, an inverter unit that converts the DC into AC of an arbitrary frequency, and operates a compressor motor, and an inverter unit. And a control unit. The converter unit has a smoothing capacitor that smoothes the DC voltage rectified by a rectifier circuit such as a diode bridge. In general, the smoothing capacitor has a large capacity, and charged charges accumulated during the operation of the outdoor unit are large. The state in which the control unit is operating is maintained for a period of time after the operation is stopped until the residual electric charge is discharged and the control power supply voltage applied to the control unit decreases.

  As a technique for rapidly discharging the residual charge of the smoothing capacitor after the operation is stopped, the motor is not rotated by giving a constant open command to one of the switching elements of the three-phase inverter circuit when the operation is stopped. A technique for discharging a residual charge of a smoothing capacitor is disclosed (for example, Patent Document 1).

JP-A 63-287396

  However, since the above-described prior art requires stop control by the control unit even when the phase loss operation is stopped, the state in which the charge that can be supplied by the control power supply voltage remains in the smoothing capacitor even after the phase loss operation is stopped is maintained. Is done. Therefore, in the above prior art, in the test on the production line, it is necessary to stop and restart the control unit during the test, or when the control unit is stopped after the test is finished and transferred to the next process. In addition, there is a problem that the time until the control unit stops after the supply of AC power is stopped becomes longer and the test time becomes longer.

  The present invention has been made in view of the above, and an object of the present invention is to provide an air conditioner control device that can shorten the test time in a production line.

  In order to solve the above-described problems and achieve the object, a control device for an air conditioner according to the present invention includes a rectifier circuit for rectifying a commercial AC voltage, and a DC bus voltage by smoothing a voltage rectified by the rectifier circuit. A smoothing capacitor, an inverter for driving the compressor motor by converting the DC bus voltage into an AC voltage of an arbitrary frequency, a transformer for generating a control power voltage from the DC bus voltage, and the control power voltage And a control unit that drives and controls the inverter unit based on a command from the outside, and the control unit is configured so that the compressor motor is operated based on a compressor motor restraining energization command from the outside. Compressor motor restraint energization that provides low torque that does not operate is continuously performed.

  According to the present invention, there is an effect that the test time in the production line can be shortened.

FIG. 1 is a diagram illustrating an example of a connection between an outdoor unit and a production facility of an air conditioner to which the air conditioner control device according to the first embodiment is applied. FIG. 2 is a flowchart illustrating an example of an air conditioner outdoor unit test process to which the air conditioner control device according to the first embodiment is applied. FIG. 3 is a diagram illustrating a difference in the test process time chart depending on the presence or absence of the restraint operation of the compressor motor according to the first embodiment. FIG. 4 is a diagram illustrating an example of connection between an outdoor unit of an air conditioner to which the air conditioner control device according to the second embodiment is applied and production equipment. FIG. 5 is a flowchart illustrating an example of an air conditioner outdoor unit test process to which the air conditioner control device according to the second embodiment is applied. FIG. 6 is a diagram illustrating a difference in the test process time chart depending on the presence or absence of the restraint operation of the fan motor according to the second embodiment. FIG. 7 is a diagram illustrating a connection example of an outdoor unit and a production facility of an air conditioner to which the air conditioner control device according to the third embodiment is applied. FIG. 8 is a flowchart illustrating an example of an air conditioner outdoor unit test process to which the air conditioner control device according to the third embodiment is applied. FIG. 9 is a diagram illustrating a difference in a test process time chart depending on whether or not the electronically controlled expansion valve according to the third embodiment operates.

  An air conditioner control apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of a connection between an outdoor unit and a production facility of an air conditioner to which the air conditioner control device according to the first embodiment is applied.

  As shown in FIG. 1, in the test process on the production line, the outdoor unit 100 supplies commercial AC voltage to the terminal block 4 and the terminal block 5 from the commercial AC power source 1 provided in the production facility 200 via the breaker 2. Is done. The breaker 2 is controlled by the equipment-side controller 3. The equipment-side controller 3 outputs a series of instructions to the outdoor unit 100 in the test process in addition to the control of the breaker 2.

  The outdoor unit 100 includes terminal blocks 4 and 5, a control device 300, and a compressor motor 12. The control device 300 drives the compressor motor 12 by converting a commercial AC voltage into a DC bus voltage and converting the DC bus voltage into a U-phase, V-phase, and W-phase three-phase AC of any frequency. The inverter unit 11 that performs the operation, the transformer 10 that generates the control power supply voltage from the DC bus voltage, the control power supply voltage is supplied, and the inverter is based on a command from the equipment-side controller 3 of the production facility 200 or an indoor unit (not shown). And a control unit 8 that drives and controls the unit 11. The converter unit 400 includes a rectifier circuit (diode bridge) 7 that rectifies the supplied commercial AC voltage, a smoothing capacitor 9 that smoothes the rectified voltage, and a reactor 6 that boosts the DC voltage.

  Next, an air conditioner outdoor unit test process to which the air conditioner control apparatus according to the first embodiment is applied will be described with reference to FIGS. 1 and 2. FIG. 2 is a flowchart illustrating an example of an air conditioner outdoor unit test process to which the air conditioner control device according to the first embodiment is applied.

  In the present embodiment, in each test process on the production line, after the test is completed or interrupted, the breaker 2 on the production facility 200 side is opened to cut off the supply of commercial AC voltage, and the compressor motor 12 is low enough not to operate. By carrying out the compressor motor restraint energization that gives torque, the control power supply voltage generated by the transformer 10 together with the DC bus voltage is lowered, and the residual charge charged in the smoothing capacitor 9 is rapidly increased until the operation of the control unit 8 stops. To discharge. By controlling in this way, the test time in the production line can be shortened.

  In each test process on the production line of the outdoor unit 100, the facility-side controller 3 first closes the breaker 2 (step ST101) and starts supplying commercial AC voltage to the outdoor unit 100 (step ST102).

  When the DC bus voltage rises, the control power supply voltage generated by the transformer 10 is turned on (step ST103), the control unit 8 is activated (step ST104), and the equipment side controller 3 or indoor unit (not shown) of the production facility 200 is activated. ) Is started (step ST105).

  Whether the control unit 8 is in the test mode (communication with the equipment-side controller 3 of the production facility 200) or not is determined by determining which of the equipment-side controller 3 or the indoor unit (not shown) of the production equipment 200 is communicated. (Communication with indoor unit) is determined (step ST106).

  In the test mode (communication with the facility-side controller 3) (step ST106; Yes), the control unit 8 performs a test operation based on the command received from the facility-side controller 3 (step ST107).

  When the test is completed or interrupted (step ST108), the equipment-side controller 3 opens the breaker 2 (step ST109) and stops supplying commercial AC voltage (step ST110), and transmits a compressor motor restraining energization command. (Step ST111).

  The control unit 8 controls the inverter unit 11 based on the compressor motor restraining energization command received from the equipment-side controller 3 and energizes the compressor motor 12 (step ST112). As a result, the residual charge of the smoothing capacitor 9 is rapidly discharged, and the control power supply voltage is turned off (step ST113).

  The equipment-side controller 3 determines whether or not it is necessary to restart the control unit 8 after the test on the outdoor unit 100 is completed (step ST114), and when it is not necessary to restart the control unit 8 (step ST114; Yes), the process in the test process is terminated.

  If it is necessary to restart the control unit 8 to continue the test (step ST114; No), the process returns to step ST101, and the processes of steps ST101 to ST114 are repeatedly executed.

  In step ST106, when it is determined that the test mode is not set (communication with indoor unit: normal operation mode) (step ST106; No), the control unit 8 performs normal operation based on a command received from the indoor unit. Is performed (step ST115). When a breaker (not shown) in the indoor unit is opened (step ST116), the control unit 8 stops the control operation, the residual charge of the smoothing capacitor 9 is discharged, and the control power supply voltage generated by the transformer 10 is turned off. (Step ST113). Then, when the breaker in the indoor unit is closed and the commercial AC voltage is supplied, the control power supply voltage is kept in the OFF state, and the control unit (not shown) in the indoor unit determines to start (corresponding to step ST114; No). ), Returning to step ST101, the processes of steps ST101 to ST114 are repeatedly executed.

  FIG. 3 is a diagram illustrating a difference in the test process time chart depending on the presence or absence of the restraint operation of the compressor motor according to the first embodiment. FIG. 3A shows a time chart when the compressor motor 12 is restrained, and FIG. 3B shows a time chart when the compressor motor 12 is not restrained. .

  In the example in which the compressor motor 12 is restrained as shown in FIG. 3A, the time when the breaker 2 is closed in step ST101 is T1, the control power supply voltage is turned on in step ST102, and the control unit 8 is activated. At time T2, the breaker 2 is opened at step ST106, and a compressor motor restraining energization command is transmitted. At step ST107, the time at which restraint energization of the compressor motor 12 is started is T3, and the residual charge of the smoothing capacitor 9 is discharged. The time when the control power supply voltage is turned off in step ST108 is T4.

  In the example of the case where the compressor motor 12 shown in FIG. 3B is not restrained, time T1 to time T3 are equal to the timing shown in FIG. T5.

  As shown in FIG. 3, when the restraint operation of the compressor motor 12 is performed after completion or interruption of the test on the production line (FIG. 3A), the restraint operation of the compressor motor 12 is not performed. Compared with (FIG. 3B), the test time can be shortened by T5-T4.

  As described above, according to the control device for an air conditioner according to the first embodiment, the control power supply voltage supplied to the control unit is generated from the DC bus voltage smoothed by the smoothing capacitor, and the supply of the commercial AC voltage is stopped. In response to the compressor motor restraint energization command input from the outside, the compressor motor restraint energization that gives low torque to the extent that the compressor motor does not operate is continuously executed. The residual charge generated can be discharged quickly, and the time from when the supply of commercial AC voltage stops until the operation of the control unit stops can be shortened, so the test time on the production line can be shortened Can do.

Embodiment 2. FIG.
In the first embodiment, the compressor motor is restrained and energized to rapidly discharge the residual charge charged in the smoothing capacitor. However, in the present embodiment, the fan motor provided in the outdoor unit is restrained and energized. Thus, an example in which the residual charge charged in the smoothing capacitor is rapidly discharged will be described.

  FIG. 4 is a diagram illustrating an example of connection between an outdoor unit of an air conditioner to which the air conditioner control device according to the second embodiment is applied and production equipment. As shown in FIG. 4, the outdoor unit 100 a includes a fan motor 14 in addition to the configuration described in the first embodiment. The outdoor unit 100a includes a control device 300a instead of the control device 300 described in the first embodiment.

  The air conditioner control device 300a according to the second embodiment is operated by the control power supply voltage in the same manner instead of the control unit 8 described in the first embodiment, and the equipment-side controller 3 or the indoor unit ( A control unit 8a that outputs an operation command to the inverter unit 11 and the fan motor driving inverter unit 13 based on a command from a not-shown), and further, the DC bus voltage is set to a U-phase, V-phase of an arbitrary frequency, A fan motor driving inverter unit 13 that converts the W phase into three-phase alternating current to drive the fan motor 14 is provided. In addition, the same code | symbol is attached | subjected to the component which is the same as that of Embodiment 1, or equivalent, and the detailed description is abbreviate | omitted.

  Next, an air conditioner outdoor unit test process to which the air conditioner control apparatus according to the second embodiment is applied will be described with reference to FIGS. 4 and 5. FIG. 5 is a flowchart illustrating an example of an air conditioner outdoor unit test process to which the air conditioner control device according to the second embodiment is applied. In addition, the same code | symbol is attached | subjected to the process which is the same as that of Embodiment 1, or equivalent, and the detailed description is abbreviate | omitted.

  In the present embodiment, in each test process on the production line, the breaker 2 on the production facility 200 side is opened after the test is completed or interrupted to cut off the supply of the commercial AC voltage, and the low torque that prevents the fan motor 14 from operating. As in the first embodiment, the control power supply voltage generated by the transformer 10 is reduced together with the DC bus voltage, and the smoothing capacitor 9 is charged until the operation of the control unit 8a is stopped. The residual charge generated is discharged rapidly. By controlling in this way, the test time in the production line can be shortened as in the first embodiment.

  As shown in FIG. 5, the processes in steps ST101 to ST110 are the same as the processes described in the first embodiment, and step ST111 and step ST112 are different.

  In step ST110, the facility-side controller 3 stops supplying the commercial AC voltage and transmits a fan motor restraining energization command (step ST211).

  The control unit 8a controls the fan motor driving inverter unit 13 based on the fan motor restraining energization command received from the facility-side controller 3, and energizes the fan motor 14 (step ST212). As a result, the residual charge of the smoothing capacitor 9 is rapidly discharged, and the control power supply voltage is turned off (step ST113). The subsequent processes in steps ST113 to ST116 are the same as the processes described in the first embodiment.

  FIG. 6 is a diagram illustrating a difference in the test process time chart depending on the presence or absence of the restraint operation of the fan motor according to the second embodiment. FIG. 6A shows a time chart when the fan motor 14 is restrained, and FIG. 6B shows a time chart when the fan motor 14 is not restrained.

  In the example when the fan motor 14 is restrained as shown in FIG. 6A, the time when the breaker 2 is closed in step ST101 is T1, and the time when the control power supply voltage is turned on in step ST102 and the control unit 8a is activated. T2, the breaker 2 is opened in step ST206, and a fan motor restraining energization command is transmitted. In step ST207, the time when the restraint energization of the fan motor 14 is started is T3, and the residual charge of the smoothing capacitor 9 is discharged. In step ST108 The time when the control power supply voltage is turned off is T4.

  In the example where the fan motor 14 is not restrained in operation shown in FIG. 6B, time T1 to time T3 is equal to the timing shown in FIG. 6A, and the time when the control power supply voltage is OFF is set to T5. It is said.

  As shown in FIG. 6, when the restraint operation of the fan motor 14 is performed after completion or interruption of the test on the production line (FIG. 6A), the restraint operation of the fan motor 14 is not performed (FIG. 6). Compared with 6 (b)), the test time can be shortened by T5-T4 minutes.

  As described above, according to the control device for an air conditioner according to the second embodiment, the control power supply voltage supplied to the control unit is generated from the DC bus voltage smoothed by the smoothing capacitor, and the supply of the commercial AC voltage is stopped. In response to the fan motor restraint energization command input from the outside, the fan motor restraint energization that gives a low torque to the extent that the fan motor does not operate is continuously performed. Since the charge can be discharged rapidly and the time from when the supply of the commercial AC voltage is stopped until the operation of the control unit is stopped can be shortened, the test in the production line is performed as in the first embodiment. Time can be shortened.

Embodiment 3 FIG.
In the first and second embodiments, the compressor motor or the fan motor is restrained and energized to rapidly discharge the residual charge charged in the smoothing capacitor. However, in the present embodiment, the electronic device provided in the outdoor unit is used. An example will be described in which the residual charge charged in the smoothing capacitor is rapidly discharged by driving the control type expansion valve.

  FIG. 7 is a diagram illustrating a connection example of an outdoor unit and a production facility of an air conditioner to which the air conditioner control device according to the third embodiment is applied. As shown in FIG. 7, the outdoor unit 100 b includes an electronically controlled expansion valve 16 in addition to the configuration described in the first embodiment. The outdoor unit 100b includes a control device 300b instead of the control device 300 described in the first embodiment.

  The air conditioner control apparatus 300b according to the third embodiment replaces the transformer 10 described in the first embodiment, and generates a first control power supply voltage and a second control power supply voltage from the DC bus voltage. It has. The control device 300b is provided with an electronic control type expansion valve drive unit 15 that is supplied with the first control power supply voltage and drives the electronic control type expansion valve 16, and replaces the control unit 8 described in the first embodiment. The second control power supply voltage is supplied, and operation commands to the inverter unit 11 and the electronically controlled expansion valve drive unit 15 are issued based on commands from the equipment-side controller 3 of the production facility 200 or an indoor unit (not shown). A control unit 8b for outputting is provided. In addition, the same code | symbol is attached | subjected to the component which is the same as that of Embodiment 1, or equivalent, and the detailed description is abbreviate | omitted.

  Next, an outdoor unit test process to which the air conditioner control device according to the third embodiment is applied will be described with reference to FIGS. FIG. 8 is a flowchart illustrating an example of an outdoor unit test process to which the air conditioner control device according to the third embodiment is applied. In addition, the same code | symbol is attached | subjected to the process which is the same as that of Embodiment 1, or equivalent, and the detailed description is abbreviate | omitted.

  In this embodiment, in each test process on the production line, after the test is completed or interrupted, the breaker 2 on the production facility 200 side is opened to cut off the supply of commercial AC voltage and the electronically controlled expansion valve 16 is operated. Thus, as in the first embodiment, the control power supply voltage generated by the transformer 10 together with the DC bus voltage decreases, and the residual charge charged in the smoothing capacitor 9 is rapidly discharged until the operation of the control unit 8b is stopped. By controlling in this way, the test time in the production line can be shortened as in the first embodiment.

  As shown in FIG. 8, the processes in steps ST101 to ST110 are the same as the processes described in the first embodiment, and step ST111 and step ST112 are different.

  In step ST110, the facility-side controller 3 stops supplying the commercial AC voltage and transmits an expansion valve operation command (step ST311).

  Based on the expansion valve operation command received from the facility-side controller 3, the control unit 8b controls the electronic control type expansion valve drive unit 15 to operate the electronic control type expansion valve 16 (step ST312). As a result, the residual charge of the smoothing capacitor 9 is rapidly discharged, and the control power supply voltage is turned off (step ST113). The subsequent processes in steps ST113 to ST116 are the same as the processes described in the first embodiment.

  FIG. 9 is a diagram illustrating a difference in a test process time chart depending on whether or not the electronically controlled expansion valve according to the third embodiment operates. FIG. 9A shows a time chart when the electronically controlled expansion valve 16 is operated, and FIG. 9B shows a time chart when the electronically controlled expansion valve 16 is not operated. ing.

  In the example of the operation of the electronically controlled expansion valve 16 shown in FIG. 9A, the time when the breaker 2 is closed in step ST101 is T1, the control power supply voltage is turned on in step ST102, and the control unit 8b is activated. T2, the breaker 2 is opened in step ST306, the expansion valve operation command is transmitted, the time when the operation of the electronically controlled expansion valve 16 is started in step ST307, the residual charge of the smoothing capacitor 9 is discharged, The time when the control power supply voltage is turned off in step ST108 is T4.

  In the example in which the operation of the electronic control type expansion valve 16 shown in FIG. 9B is not performed, time T1 to time T3 are equal to the timing shown in FIG. 9A, and the time when the control power supply voltage is turned OFF. Is T5.

  As shown in FIG. 9, when the electronically controlled expansion valve 16 is operated after the test on the production line is completed or interrupted (FIG. 9A), the electronically controlled expansion valve 16 is operated. The test time can be shortened by T5-T4 as compared with the case where there is not (FIG. 9B).

  As described above, according to the control device for an air conditioner according to the third embodiment, the control power supply voltage supplied to the control unit is generated from the DC bus voltage smoothed by the smoothing capacitor, and the supply of the commercial AC voltage is stopped. Since the electronically controlled expansion valve is continuously operated based on the expansion valve operation command input from the outside in accordance with the residual charge charged in the smoothing capacitor can be rapidly discharged. Since the time from when the supply of AC voltage stops until the operation of the control unit stops can be shortened, the test time in the production line can be shortened as in the first embodiment.

  Note that the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.

DESCRIPTION OF SYMBOLS 1 Commercial AC power source 2 Breaker 3 Equipment side controller 4 Terminal block 5 Terminal block 6 Reactor 7 Rectifier circuit (diode bridge)
8, 8a, 8b Control unit 9 Smoothing capacitor 10, 10a Transformer 11 Inverter unit 12 Compressor motor 13 Fan motor drive inverter unit 14 Fan motor 15 Electronically controlled expansion valve drive unit 16 Electronically controlled expansion valve 100, 100a, 100b Outdoor unit 200 Production equipment 300, 300a, 300b Controller 400 Converter unit

Claims (3)

A rectifier circuit for rectifying commercial AC voltage;
A smoothing capacitor that smoothes the voltage rectified by the rectifier circuit to obtain a DC bus voltage;
An inverter unit for driving the compressor motor by converting the DC bus voltage into an AC voltage of an arbitrary frequency;
A transformer that generates a control power supply voltage from the DC bus voltage;
A control unit that operates by being supplied with the control power supply voltage, and that drives and controls the inverter unit based on an external command;
With
The air conditioner is characterized in that the controller continuously performs compressor motor restraint energization that gives a low torque that does not allow the compressor motor to operate based on an external compressor motor restraint energization command. Control device. A rectifier circuit for rectifying commercial AC voltage;
A smoothing capacitor that smoothes the voltage rectified by the rectifier circuit to obtain a DC bus voltage;
A fan motor driving inverter unit for converting the DC bus voltage to an AC voltage of an arbitrary frequency to drive the fan motor;
A transformer that generates a control power supply voltage from the DC bus voltage;
A control unit that operates by being supplied with the control power supply voltage, and that drives and controls the fan motor driving inverter unit based on an external command;
With
The air conditioner control device, wherein the control unit continuously performs fan motor restraint energization that gives a low torque that does not allow the fan motor to operate based on an external fan motor restraint energization command. . A rectifier circuit for rectifying commercial AC voltage;
A smoothing capacitor that smoothes the voltage rectified by the rectifier circuit to obtain a DC bus voltage;
A transformer for generating a first control power voltage and a second control power voltage from the DC bus voltage;
An electronically controlled expansion valve driver that operates by supplying the first control power supply voltage and drives the electronically controlled expansion valve;
A control unit that operates by being supplied with the second control power supply voltage, and that drives and controls the electronically controlled expansion valve drive unit based on an external command;
With
The said control part is a control apparatus of the air conditioner characterized by continuing operating the said electronically controlled expansion valve based on the expansion valve operation command from the outside.

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