JPWO2016170633A1 - Air conditioner - Google Patents

Abstract

Even if the specifications of the motor, the outdoor unit control unit, and the connected commercial power supply are different, the motor and the outdoor unit control unit of the air conditioner have the purpose of obtaining an air conditioner that can share the control circuit unit. The reference voltage value is determined according to the setting information of the connected commercial power supply, the reference voltage value output from the inverter circuit driving microcomputer is stabilized, and the stabilized reference voltage value is converted into the voltage converted from the bus current. In comparison, an air conditioner having a variable reference voltage value is obtained.

Description

  The present invention relates to an air conditioner capable of overcurrent protection for a load device represented by a motor in an outdoor unit that is an outdoor unit of the air conditioner.

  Patent Document 1, which is an example of the prior art, has an issue of “performing an overcurrent protection, an overvoltage protection, and an overpower protection of an inverter circuit”. “An input voltage Vcc connected to a DC power supply 11 is applied to a motor. The inverter circuit 12 that supplies power to the inverter 13, the input current detection circuit 21 that detects the input current Iin flowing through the inverter circuit 12 by converting the input current Iin into a voltage Vin2 corresponding to the input current Iin, and the inverter circuit 12 are controlled. The current voltage control unit 20 generates a reference voltage Vref corresponding to a limit value of the current flowing through the inverter circuit 12 when the input voltage Vcc is applied, and includes the reference voltage Vref and the current voltage control unit 20. By comparing the voltage Vin2, the inverter circuit is operated so as to operate within a desired input current limit value Imax corresponding to the input voltage Vcc. It controls the 12 "power control device is disclosed.

JP 2013-66272 A

  However, according to the above-described conventional technology, the overcurrent protection circuit for protecting the motor as a load from overcurrent has only the function of making the overcurrent protection value variable according to the input voltage, and the same power control. When driving a motor having a different overcurrent protection value using a device, it is necessary to switch overcurrent protection value specifications for each type of motor. Further, not only the motor type but also the specifications of the outdoor unit control unit or the connected commercial power supply must be switched. Therefore, there is a problem that the control circuit unit cannot be shared.

  The present invention has been made in view of the above, and even if the specifications of the motor, the outdoor unit control unit or the connected commercial power source are different, the control circuit unit can be shared while realizing overcurrent protection. The purpose is to obtain a simple air conditioner.

  In order to solve the above-described problems and achieve the object, an air conditioner according to the present invention includes a rectifier circuit that converts an AC voltage from an AC power source into a DC voltage and outputs the DC voltage, and a DC that is output from the rectifier circuit. A smoothing circuit that smoothes the voltage through a power factor correction circuit, an inverter circuit that converts the DC voltage smoothed by the smoothing circuit into an AC voltage, and outputs the AC voltage to the compressor, and an inverter drive circuit that drives the inverter circuit An inverter circuit driving microcomputer that controls the inverter driving circuit, a control main microcomputer that controls a refrigerant circuit compressed by the compressor, and a current voltage that is output by converting the bus current of the inverter circuit to a voltage level A comparison circuit, a voltage comparison circuit that compares a voltage level obtained from the current-voltage conversion circuit and a reference voltage value, and a comparison result of the voltage comparison circuit A stop circuit that stops the operation of the compressor by stopping the inverter circuit when the voltage level exceeds the reference voltage value, and a model switching unit that outputs setting information to the control main microcomputer, The control main microcomputer calculates the reference voltage value to the voltage comparison circuit based on setting information acquired from the model switching unit and communicates with the inverter circuit driving microcomputer. The inverter circuit driving microcomputer The voltage of the reference voltage value is generated by the reference voltage value obtained from the control main microcomputer.

  The air conditioner according to the present invention has an effect that the control circuit unit can be shared while realizing overcurrent protection even if the specifications of the motor, the outdoor unit control unit, and the connected commercial power supply are different. .

The figure which shows the whole structure of the air conditioner which concerns on Embodiment 1. FIG. The figure which shows the structure of the outdoor unit in Embodiment 1, and the outdoor unit control part. The figure which shows the structure of the indoor unit in Embodiment 1, and an indoor unit control part. The figure which shows an example of the data stored in the control main microcomputer in Embodiment 1 The flowchart which shows operation | movement of the air conditioner which concerns on Embodiment 1. FIG. The flowchart which shows operation | movement of the air conditioner which concerns on Embodiment 2. FIG. The flowchart which shows operation | movement of the air conditioner which concerns on Embodiment 3. FIG.

  Hereinafter, an air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an overall configuration of an air conditioner according to Embodiment 1 of the present invention. FIG. 1 shows an outdoor unit 1, an indoor unit 2, and a remote controller 5. The outdoor unit 1 and the indoor unit 2 are connected by a refrigerant pipe 3 and an indoor / outdoor connection wiring 4, and the indoor unit 2 and the remote controller 5 are connected by a remote control wiring 6.

  In the remote controller 5, the user selects an operation mode such as cooling or heating and an air conditioning set temperature, and the remote controller 5 outputs an operation command according to the selected operation mode and air conditioning set temperature. In addition, the remote controller 5 includes a display unit 5a, and the display unit 5a displays the operating state of the air conditioner, the indoor suction temperature, and the air conditioning set temperature. The remote controller 5 may be a wireless remote controller.

  In addition, the compressor 11, the outdoor heat exchanger 12 and the electronic expansion valve 13 included in the outdoor unit 1 and the indoor heat exchanger 21 included in the indoor unit 2 are connected in a ring shape via the refrigerant pipe 3. Thus, the refrigerant circuit of the air conditioner is configured. The refrigerant in the refrigerant pipe 3 is compressed by the compressor 11. Outdoor air is sent to the outdoor heat exchanger 12 by the outdoor fan 14, and indoor air is sent to the indoor heat exchanger 21 by the indoor fan 22.

  The outdoor unit 1 is provided with an outdoor unit control unit 10, which includes a compressor 11, an outdoor fan motor 15, a high pressure switch 16, a low pressure switch 17, a compressor shell temperature thermistor 18, and the like. A refrigerant temperature thermistor 19 is connected. The indoor unit 2 is provided with an indoor unit control unit 20, and an indoor fan motor 23, an indoor temperature thermistor 24, and a cold room piping temperature thermistor 25 are connected to the indoor unit control unit 20. Moreover, although the commercial power supply 7 which is a three-phase alternating current power supply is connected to the outdoor unit control part 10, the commercial power supply 7 may be a single phase.

  FIG. 2 is a diagram illustrating configurations of the outdoor unit 1 and the outdoor unit control unit 10. The commercial power supply 7 is connected to the rectifier circuit 101, and a smoothing capacitor 102 is provided at the subsequent stage of the rectifier circuit 101. On the P bus side between the rectifier circuit 101 and the smoothing capacitor 102, a power factor improving reactor 103 and an inrush current suppressing circuit 104 connected in series are provided. That is, a power factor correction circuit is provided. The inrush current suppression circuit 104 includes an inrush current suppression relay 104a and an inrush current prevention element 104b, and is provided in the front stage of the reactor 103. The inrush current suppressing relay 104a and the inrush current preventing element 104b are connected in parallel. The AC voltage from the commercial power supply 7 is converted into a DC voltage by the rectifier circuit 101, and this DC voltage is smoothed to the bus voltage by the smoothing capacitor 102 via the reactor 103 and the inrush current suppression circuit 104. The inrush current suppression relay 104a is also called a 52C relay.

  An inverter circuit 105 is provided after the smoothing capacitor 102, and transistors 105a, 105b, 105c, 105d, 105e, and 105f are provided in the inverter circuit 105. A driving circuit 105g labeled Up is connected to the base of the transistor 105a, a driving circuit 105h labeled Vp is connected to the base of the transistor 105b, and a driving labeled Wp is connected to the base of the transistor 105c. Circuit 105i is connected to the base of the transistor 105d, a driving circuit 105j written as Un is connected to the base of the transistor 105e, and a driving circuit 105k written as Vn is connected to the base of the transistor 105f. Is connected to a driving circuit 105l labeled Wn. The driving circuits 105g, 105h, 105i, 105j, 105k, and 105l perform on / off control of the transistors 105a, 105b, 105c, 105d, 105e, and 105f, respectively. The inverter circuit 105 converts the bus voltage, which is a DC voltage smoothed by the smoothing capacitor 102, into an AC voltage and outputs the AC voltage. The AC voltage is output to the compressor 11, and the compressor 11 operates according to the frequency of the AC voltage. . Further, the inverter circuit 105 includes a stop circuit 105m, and the stop circuit 105m is configured to be able to stop the compressor 11 by stopping the drive circuits 105j, 105k, and 105l. The driving circuits 105g, 105h, 105i, 105j, 105k, and 105l are connected to the inverter circuit driving microcomputer 110 and are on / off controlled by the inverter circuit driving microcomputer 110.

  The outdoor unit 1 is provided with a control main microcomputer 120 that controls the overall control of the outdoor unit 1, and the control main microcomputer 120 transmits and receives information to and from the inverter circuit driving microcomputer 110 via the communication circuit 140. Do. As an example of the operation of such a configuration, the control main microcomputer 120 transmits the calculated operation frequency required for the operation of the compressor 11 to the inverter circuit driving microcomputer 110, and the inverter circuit driving microcomputer 110 transmits the control main microcomputer 120. Is transmitted to the driving circuits 105g, 105h, 105i, 105j, 105k, and 105l, and the inverters by the driving circuits 105g, 105h, 105i, 105j, 105k, and 105l are communicated. The compressor 11 is driven by on / off control in the circuit 105.

  A current-voltage conversion circuit 112 is provided on the N bus side between the smoothing capacitor 102 and the inverter circuit 105, and an overcurrent comparison circuit 111 is connected to the current-voltage conversion circuit 112. The current-voltage conversion circuit 112 converts the bus current Idc flowing in the inverter circuit 105 into a voltage level signal and outputs the voltage level signal from the voltage level signal output unit 112a.

  The overcurrent comparison circuit 111 includes a comparison circuit 111a and a voltage stabilization circuit 111b, and the voltage level signal of the bus current Idc output from the current-voltage conversion circuit 112 is input from the voltage level signal output unit 112a to the comparison circuit 111a. The On the other hand, the stabilized reference voltage output from the analog output terminal 110a of the inverter circuit driving microcomputer 110 is applied to the voltage stabilizing circuit 111b. The comparison circuit 111a outputs a voltage value of the voltage level signal of the bus current Idc output from the current-voltage conversion circuit 112, and is output from the analog output terminal 110a of the inverter circuit driving microcomputer 110 and stabilized by the voltage stabilization circuit 111b. Is compared with the reference voltage value. As a result of the comparison, when the voltage value of the voltage level signal of the bus current Idc is higher than the reference voltage value output from the analog output terminal 110a and stabilized, an overcurrent determination signal is output from the overcurrent output unit 111c. . The overcurrent determination signal is input to the inverter circuit driving microcomputer 110 and the stop circuit 105 m of the inverter circuit 105. The stop circuit 105m to which the overcurrent determination signal is input stops the inverter circuit 105. When the inverter circuit 105 stops, the operation of the compressor 11 also stops.

  Further, the overcurrent determination signal is also input to the inverter circuit driving microcomputer 110, and the inverter circuit driving microcomputer 110 can grasp the state of the overcurrent. In this way, when the overcurrent occurs, the inverter circuit 105 is stopped and the operation of the compressor 11 is stopped. Therefore, the inverter circuit 105 is protected from the overcurrent while preventing the failure of the compressor 11, and is caused by abnormal heating. Deterioration or failure of parts can be prevented.

  The inverter circuit driving microcomputer 110 includes an analog input terminal 110b, and a stabilized reference voltage output from the voltage stabilization circuit 111b is input to the analog input terminal 110b.

  The inrush current suppression relay drive circuit 123 is a drive circuit for the inrush current suppression relay 104a, and the control main microcomputer 120 controls on / off of the inrush current suppression relay 104a.

  The conversion circuit 113 is a voltage conversion circuit that receives the value of the bus voltage smoothed by the smoothing capacitor 102 and converts it so that it can be read by the inverter circuit driving microcomputer 110 and outputs it to the inverter circuit driving microcomputer 110. is there.

  The control main microcomputer 120 controls a fan motor drive circuit 124, and the drive circuit 124 controls the number of rotations of the outdoor fan motor 15 expressed as MF. The control main microcomputer 120 controls the drive circuit 125 for the electronic expansion valve, and the drive circuit 125 controls the opening degree of the electronic expansion valve 13.

  The high pressure switch 16 operates when the pressure of the refrigerant in the refrigerant circuit exceeds a threshold value, and the operating state of the high pressure switch 16 is input to the control main microcomputer 120 via the conversion circuit 130. The low pressure switch 17 operates when the pressure of the refrigerant in the refrigerant circuit becomes less than the threshold value, and the operating state of the low pressure switch 17 is input to the control main microcomputer 120 via the conversion circuit 131. The compressor shell temperature thermistor 18 detects the outer temperature of the compressor 11, that is, the shell temperature, and outputs a detected value. The detected value is input to the control main microcomputer 120 via the conversion circuit 132. The refrigerant temperature thermistor 19 detects the temperature of the refrigerant in the refrigerant circuit and outputs a detection value. The detected value is input to the control main microcomputer 120 via the conversion circuit 133.

  The nonvolatile memory 121 is a memory for recording information to be recorded by the control main microcomputer 120.

  The model switching unit 122 switches the setting according to the driving capability including the horsepower of the outdoor unit 1 and the power supply specification of the commercial power supply 7. The power supply specifications include three-phase or single-phase.

  The display unit 126 displays the operation status of the outdoor unit 1 and the abnormality occurring in the outdoor unit 1 to notify the user.

  The microcomputer malfunction monitoring circuit 127 is connected to a reset (RESET) terminal of the control main microcomputer 120. The microcomputer malfunction monitoring circuit 127 outputs a signal to the reset terminal of the control main microcomputer 120 when detecting the malfunction of the control main microcomputer 120. The control main microcomputer 120 that has received the signal at the reset terminal is reset to prevent further runaway.

  The indoor communication circuit 128 is a communication circuit for the control main microcomputer 120 to communicate with the indoor unit 2.

  FIG. 3 is a diagram illustrating configurations of the indoor unit 2 and the indoor unit control unit 20. The outdoor communication circuit 203 is a communication circuit for the indoor control microcomputer 201 to communicate with the outdoor unit 1. That is, the control main microcomputer 120 of the outdoor unit 1 and the indoor control microcomputer 201 of the indoor unit 2 transmit and receive information via the indoor communication circuit 128 and the outdoor communication circuit 203.

  The indoor control microcomputer 201 controls the fan drive circuit 208, and the fan drive circuit 208 controls the rotation speed of the indoor fan motor 23.

  The room temperature thermistor 24 detects the room temperature and outputs a detection value, and the detection value is input to the room control microcomputer 201 via the conversion circuit 206. The cold room piping temperature thermistor 25 detects the temperature of the piping of the indoor unit 2 and outputs a detected value, and the detected value is input to the indoor control microcomputer 201 via the conversion circuit 207.

  The nonvolatile memory 202 is a memory that records information to be recorded by the indoor control microcomputer 201.

  The changeover switch 204 switches the setting of the indoor unit 2 according to the driving situation. The remote control communication circuit 205 is a communication circuit for the indoor control microcomputer 201 to communicate with the remote controller 5.

  The operation of the air conditioner using the outdoor unit 1 and the indoor unit 2 described above will be described.

  FIG. 4 is a diagram illustrating an example of table data stored in the control main microcomputer 120. In the table data shown in FIG. 4, types 10a to 10h of outdoor unit control units, types 11a to 11g of compressors, types 110aa to 112ag of reference voltage values, and types 112aa to 112ag of overcurrent protection levels are shown for each configuration example. Has been. In the table data shown in FIG. 4, as a single-phase model a, horsepower 1.5, outdoor unit controller type 10a, compressor 11a, overcurrent protection level 112aa, reference voltage value 110aa, allowable reference voltage range ± 0. The configuration of 1% is shown. As the three-phase model g, the horsepower 1.5, the type 10d of the outdoor unit controller, the compressor 11a, the overcurrent protection level 112aa, the reference voltage value 110aa, the allowable reference voltage range ± A 0.1% configuration is shown. The single-phase model a and the three-phase model g are different in the type of the outdoor unit control unit 10. As in these configuration examples, it is necessary to switch the reference voltage value for each configuration example between the single-phase model a and the three-phase model g, and it is difficult to share the unit control unit 10 with the conventional technology. Met.

  FIG. 5 is a flowchart showing the operation of the air conditioner according to the present embodiment. First, processing is started when the power is turned on, and the model switching unit 122 inputs model setting information to the control main microcomputer 120 (S1). The control main microcomputer 120 determines the specifications of the commercial power supply 7 from the input setting information (S2), determines the specifications of the model from the input setting information (S3), and the outdoor unit control unit from the input setting information 10 specifications are determined (S4), and the specifications of the compressor 11 are determined from the input setting information (S5). Here, the order of steps S2 to S5 is not particularly limited.

  Then, the control main microcomputer 120 determines the compressor overcurrent protection level according to the determination result in steps S2 to S5 (S6), and the voltage value of the reference voltage output from this compressor overcurrent protection level to the voltage stabilization circuit 111b. (S7), and transmits the reference voltage value and allowable voltage range value determined in step S7 to the inverter circuit driving microcomputer 110 (S8). The inverter circuit driving microcomputer 110 outputs the voltage value of the received reference voltage from the analog output terminal 110a (S9), and thereafter ends the processing.

  As described above, the air conditioner described in the present embodiment converts the AC voltage from the AC power source into a DC voltage and outputs it, and the DC voltage output from the rectifier circuit via the power factor correction circuit. A smoothing circuit that smoothes and smoothes, an inverter circuit that converts the DC voltage smoothed by the smoothing circuit into an AC voltage and outputs the AC voltage, an inverter drive circuit that drives the inverter circuit, and the inverter drive circuit A microcomputer for driving the inverter circuit, a control main microcomputer for controlling the refrigerant circuit of the refrigerant compressed by the compressor, and a current-voltage conversion circuit for converting the detected value of the bus current of the inverter circuit into a voltage level and outputting the voltage level A voltage comparison circuit for comparing the voltage level output from the current-voltage conversion circuit with a reference voltage value, and setting information of the model to the control main microcomputer The control main microcomputer calculates the reference voltage value to the voltage comparison circuit based on the model setting information obtained from the model switching unit, and communicates to the inverter circuit driving microcomputer. The inverter circuit driving microcomputer generates the reference voltage value based on the reference voltage value obtained from the control main microcomputer.

  As described above, since the reference voltage value in the overcurrent comparison circuit can be controlled in accordance with the specifications of the motor, the outdoor unit, the outdoor unit control unit, and the commercial power supply, as described in the present embodiment, the motor, the outdoor unit Even if the specifications of the unit, the outdoor unit control unit, and the connected commercial power supply are different, the control circuit unit can be shared.

Embodiment 2. FIG.
In the present embodiment, a mode in which the accuracy of the reference voltage value can be further improved as compared with the first embodiment will be described.

  FIG. 6 is a flowchart showing the operation of the air conditioner according to Embodiment 2 of the present invention. Also in FIG. 6, steps S1 to S9 are the same as those in FIG. 5 of the first embodiment.

  In the present embodiment, after the reference voltage value is output from the analog output terminal 110a in step S9, this reference voltage value, which is the output voltage of the voltage stabilizing circuit 111b, is input to the analog input terminal 110b (S10). Then, the inverter circuit driving microcomputer 110 determines whether or not the voltage value input from the analog input terminal 110b is within the allowable voltage range (S11). When branching to No in S11, that is, when it is not within the allowable voltage range, the output voltage value of the analog output terminal 110a is adjusted so as to be within the allowable voltage range, and the command voltage is output to the analog output terminal 110a (S12). ), Returning to step S10, this reference voltage value, which is the output voltage of the voltage stabilizing circuit 111b, is input to the analog input terminal 110b (S10), and the determination in step S11 is performed again. When branching to Yes in S11, that is, within the allowable voltage range, the process is terminated.

  As described above, by feeding back the reference voltage value of the comparison circuit in the overcurrent protection circuit, the reference voltage value of the comparison circuit can be corrected, and the accuracy of the reference voltage value can be improved.

  Further, in the configuration without the conventional overcurrent protection circuit, there is a problem that an error may occur in the reference voltage value of the comparison circuit depending on the variation of the component circuit components. However, according to the configuration of the present embodiment, there is a problem. The reference voltage value of the comparison circuit in the overcurrent protection circuit is fed back to correct the reference voltage value of the comparison reference circuit, that is, the voltage is adjusted if the reference voltage value of the comparison circuit is not within the allowable voltage range. Since the command voltage can be output, the reliability and accuracy of overcurrent protection can be increased.

Embodiment 3 FIG.
In the present embodiment, a mode in which the outdoor unit can be stopped without any problem even when the reference voltage value cannot be set correctly for a certain period due to an abnormality or failure of the overcurrent comparison circuit will be described.

  FIG. 7 is a flowchart showing the operation of the air conditioner according to Embodiment 3 of the present invention. In FIG. 7, steps S1 to S9 are the same as those in the first and second embodiments. Step S10 is the same as that in the second embodiment.

  In the present embodiment, after the reference voltage value is input to the analog input terminal 110b in step S10, the inverter circuit driving microcomputer 110 determines whether the voltage value input from the analog input terminal 110b is within the allowable voltage range. It is determined whether or not (S21).

  If the process branches to Yes in step S21, that is, if the output voltage of the voltage stabilization circuit 111b input in step S10 is within the allowable voltage range received from the control main microcomputer 21 in step S8, the process ends. .

  When branching to No in step S21, that is, when the output voltage of the voltage stabilization circuit 111b input in step S10 is not within the allowable voltage range received from the control main microcomputer 120 in step S8, the inverter circuit driving microcomputer 110 starts the timer (S22).

  Next, the inverter circuit driving microcomputer 110 outputs from the analog output terminal 110a so that the output voltage of the voltage stabilization circuit 111b input in step S10 matches the reference voltage value received from the control main microcomputer 120. The reference voltage value is adjusted and output (S23).

  Next, the output voltage of the voltage stabilization circuit 111b is input to the inverter circuit driving microcomputer 110 from the analog input terminal 110b (S24), and the output voltage of the voltage stabilization circuit 111b is output from the control main microcomputer 120 in step S8. It is determined whether it is within the received allowable voltage range (S25).

  If the process branches to Yes in step S25, that is, if the output voltage of the voltage stabilization circuit 111b input in step S24 is within the allowable voltage range received from the control main microcomputer 120 in step S8, the process ends. .

  When branching to No in step S25, that is, when the output voltage of the voltage stabilizing circuit 111b input in step S24 is not within the allowable voltage range received from the control main microcomputer 120 in step S8, the inverter circuit driving microcomputer 110 determines whether the timer started in step S22 is completed (S26).

  When branching to No in step S26, that is, when the timer is not completed, the process returns to step S23. When branching to Yes in step S26, that is, when the timer is completed, the process proceeds to step S27, and the inverter circuit driving microcomputer 110 transmits abnormality information to the control main microcomputer 120. The control main microcomputer 120 performs an abnormality process in step S28 (S28) and sets the operation standby (S29). Here, the abnormality process can be exemplified by an operation of stopping the compressor.

  In the present embodiment, an example of the timer setting time is 3 minutes. In this way, when the set time of the timer is 3 minutes, it is determined that there is an abnormality when the reference voltage value cannot be set continuously for 3 minutes. The set time of the timer is not limited to this, and may be 10 seconds or 10 minutes. However, if the time is extremely short, it may be erroneously determined to be abnormal although it is normal, and therefore, an extremely short time is excluded.

  As described above, according to the configuration of the present embodiment, it is possible to notify the user when an abnormality occurs, so that maintainability can be improved as compared to the conventional case.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 outdoor unit, 2 indoor unit, 3 refrigerant piping, 4 indoor / outdoor connection wiring, 5 remote control, 5a remote control display, 6 remote control wiring, 7 commercial power supply, 10 outdoor unit control unit, 10a to 10h outdoor unit control unit 11 compressor, 11a to 11g compressor type, 12 outdoor heat exchanger, 13 electronic expansion valve, 14 outdoor fan, 15 outdoor fan motor, 16 high pressure switch, 17 low pressure switch, 18 compressor shell temperature Thermistor, 19 Refrigerant temperature thermistor, 20 Indoor unit controller, 21 Indoor heat exchanger, 22 Indoor fan, 23 Indoor fan motor, 24 Indoor temperature thermistor, 25 Cold room piping temperature thermistor, 101 Rectifier circuit, 102 Smoothing capacitor, 103 Power Rate improvement reactor, 104 Inrush current suppression Road, 104a Inrush current suppression relay, 104b Inrush current prevention element, 105 Inverter circuit, 105a, 105b, 105c, 105d, 105e, 105f Transistor, 105g, 105h, 105i, 105j, 105k, 105l Transistor drive circuit, 105m Stop circuit 110a, microcomputer for driving the inverter circuit, 110a analog output terminal, 110aa to 112ag, reference voltage value type, 110b analog input terminal, 111 overcurrent comparison circuit, 111a comparison circuit, 111b voltage stabilization circuit, 111c overcurrent output unit, 112 Current-voltage conversion circuit, 112aa to 112ag Overcurrent protection level type, 113 conversion circuit, 120 control main microcomputer, 121 nonvolatile memory, 122 model switching unit, 123 relay drive Circuit, 124 driving circuit, 125 electronic expansion valve driving circuit, 126 display unit, 127 microcomputer malfunction monitoring circuit, 128 indoor communication circuit, 130 high pressure switch conversion circuit, 131 low pressure switch conversion circuit, 132 compressor shell temperature thermistor conversion circuit 133 Refrigerant temperature thermistor conversion circuit, 140 communication circuit, 201 indoor control microcomputer, 202 non-volatile memory, 203 outdoor communication circuit, 204 changeover switch, 205 remote control communication circuit, 206 indoor temperature thermistor conversion circuit, 207 cold room piping temperature thermistor conversion Circuit, 208 Fan drive circuit.

In order to solve the above-described problems and achieve the object, an air conditioner according to the present invention includes a rectifier circuit that converts an AC voltage from an AC power source into a DC voltage and outputs the DC voltage, and a DC that is output from the rectifier circuit. A smoothing circuit that smoothes the voltage through a power factor correction circuit, an inverter circuit that converts the DC voltage smoothed by the smoothing circuit into an AC voltage, and outputs the AC voltage to the compressor, and an inverter drive circuit that drives the inverter circuit An inverter circuit driving microcomputer that controls the inverter driving circuit, a control main microcomputer that controls a refrigerant circuit of the refrigerant compressed by the compressor, and a detection value of a bus current of the inverter circuit is converted into a voltage level. a current-voltage conversion circuit that outputs Te, a voltage comparator for comparing a voltage level and the base reference voltage value output from the current-voltage conversion circuit, the type of setting information The a type change unit to be outputted to the control main microcomputer, the control main microcomputer, the model the reference voltage value the inverter circuit is calculated the the setting information obtained type from the switching unit to said voltage comparator circuit The inverter circuit driving microcomputer generates a voltage of the reference voltage value based on the reference voltage value obtained from the control main microcomputer, and the reference voltage value of the voltage comparison circuit is within an allowable voltage range. If not, the voltage is adjusted and the command voltage is output .

Claims (4)

A rectifier circuit that converts an AC voltage from an AC power source into a DC voltage and outputs the DC voltage;
A smoothing circuit that smoothes the DC voltage output from the rectifier circuit via a power factor correction circuit;
An inverter circuit that converts the DC voltage smoothed by the smoothing circuit into an AC voltage and outputs the AC voltage to the compressor;
An inverter drive circuit for driving the inverter circuit;
An inverter circuit driving microcomputer for controlling the inverter driving circuit;
A control main microcomputer for controlling the refrigerant circuit of the refrigerant compressed by the compressor;
A current-voltage conversion circuit that converts the detected value of the bus current of the inverter circuit into a voltage level and outputs the voltage level; and
A voltage comparison circuit that compares the voltage level output from the current-voltage conversion circuit with a reference voltage value;
A model switching unit for outputting model setting information to the control main microcomputer,
The control main microcomputer calculates the reference voltage value to the voltage comparison circuit according to the setting information of the model obtained from the model switching unit, and communicates to the inverter circuit driving microcomputer,
The inverter circuit driving microcomputer generates the voltage of the reference voltage value based on the reference voltage value obtained from the control main microcomputer.   2. A stop circuit for stopping operation of the compressor by stopping the inverter circuit when the voltage level exceeds the reference voltage value based on a comparison result of the voltage comparison circuit. The air conditioner according to 1.   The air conditioner according to claim 1, wherein when the reference voltage value of the voltage comparison circuit is not within an allowable voltage range, the voltage is adjusted and a command voltage is output.   2. The air conditioner according to claim 1, wherein when the reference voltage value does not coincide with a reference voltage value obtained from the control main microcomputer, it is determined that there is an abnormality and the compressor is stopped.

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