JP2005354760A - Hybrid compressor driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and light hybrid compressor driver for eliminating a loss of external power and enhancing the reliability of the external power. <P>SOLUTION: A relay 11 as a current blocking means is provided between a battery 1 and an inverter circuit 8, and blocks a current from the inverter circuit 8 to the battery 1. When a rotation frequency of an engine 69 as the external power is high, a waste load is not applied to the engine 69, a high voltage is not applied to an inverter apparatus and comfort air conditioning is maintained within a vehicle by turning off a clutch 44 and driving a compressing section using a DC brushless motor 9. The reliable, small and light hybrid compressor driver is obtained without the power loss. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drive device for a hybrid compressor including a DC brushless motor.

  A hybrid compressor drive device capable of switching the drive source will be described using a vehicle air conditioner.

  FIG. 8 is a system configuration diagram of a vehicle air conditioner equipped with a conventional hybrid compressor. In FIG. 8, air is sucked from the air introduction port 52 by the action of the indoor blower fan 51, and the air exchanged by the indoor heat exchanger 54 through the blower duct 53 is blown out from the air blowing port 55 into the vehicle interior.

  The indoor heat exchanger 54 constitutes a refrigeration cycle together with the outdoor heat exchanger 58 that exchanges heat with outdoor air by the action of the hybrid compressor 60, the expansion device 56, and the outdoor fan 57.

  The inverter device 61 drives a DC brushless motor that is a drive source of the hybrid compressor 60. The inverter device 61 is provided with an inverter circuit including a switching element for orthogonal transformation and a diode. The battery 1 serves as a power source for the inverter device 61.

  An example of the hybrid compressor 60 is shown in a sectional view in FIG. A belt 59 is put on the pulley 38 and connected to the engine 69. The shaft of the clutch 44 is directly connected to the shaft of the DC brushless motor 9. With this configuration, when the clutch 44 is ON, it can be driven by the engine 69, and when it is OFF, it can be driven by the DC brushless motor 9.

  The hybrid compressor 60 has a configuration in which a compression mechanism 28, a DC brushless motor 9, and the like are installed in a metal casing 32. The refrigerant is sucked from the suction port 33 and compressed by driving the compression mechanism portion 28 (the scroll compression mechanism in this example) by, for example, the DC brushless motor 9. The compressed refrigerant passes (cools) through the DC brushless motor 9 and is discharged from the discharge port 34. A terminal 39 internally connected to the winding of the DC brushless motor 9 is connected to the inverter device 61.

  The operation of the inverter device 61, the indoor fan 51, the outdoor fan 57, and the clutch 44 is controlled by the air conditioner controller 62.

  The air conditioner controller 62 includes an indoor air blowing fan switch 63 for setting automatic, strong, weak, and OFF of indoor air blowing, an air conditioner switch 64 for selecting ON / OFF of cooling operation, a temperature control switch 65, an indoor temperature sensor 67, and an outdoor temperature sensor 68. And a communication device 66 for bidirectional communication with a vehicle controller (not shown). As a result, the air conditioner controller 62 can obtain the engine 69, which is the driving power, from the vehicle controller, a rotation speed signal of the motor in place of the engine 69, and the like.

  FIG. 10 shows the arrangement of the air conditioner on the vehicle.

The outdoor heat exchanger 58, the outdoor fan 57, the hybrid compressor 60, the inverter device 61, and the like are arranged and fixed on the outdoor vehicle body in front of the vehicle, and the indoor fan 51, the indoor heat exchanger 54, the air conditioner controller 62, and the like are arranged indoors. . In these arrangements on the vehicle, since the vehicle running device is given priority, it is desirable that the device is small. In addition, it is desired to be lightweight in order to save energy of running energy.

  Further, there is a technique in which the rotor of the motor unit is rotated while being driven by the engine, and electric power generated in the motor unit is led to the battery by the dynamo effect and charged (for example, refer to Patent Document 1).

  This is because the engine 69 is selected as a drive source of the hybrid compressor 60 when the engine 69 is operating (such as when the vehicle is traveling). When the air conditioner controller 62 receives a signal indicating that the engine 69 is operating by the communication device 66, the air conditioner controller 62 turns on the clutch. Further, the operation of the inverter device 61 is stopped. At this time, the DC brushless motor 9 operates as a generator, and the battery 1 is charged.

When the vehicle is stopped and the engine 69 is stopped (such as idle stop), the DC brushless motor 9 is selected as a drive source for the hybrid compressor 60. When the air conditioner controller 62 obtains a signal indicating that the engine 69 is stopped by the communication device 66, the air conditioner controller 62 turns off the clutch, starts the operation of the inverter device 61, and drives the compression mechanism unit 28 by the DC brushless motor 9.
Japanese Utility Model Publication No. 6-87678

  However, in the conventional configuration, while the external power is in operation, the DC brushless motor operates as a generator and charges the battery, so a load is applied to the external power. Even when the charging is completed, a charging current flows, the battery generates heat, and wasteful power is consumed. For this reason, it is conceivable to disconnect the connection between the DC brushless motor and the inverter device. However, since the DC brushless motor normally has three phases, at least two disconnecting devices (opening / closing devices) are required. Therefore, it becomes an obstacle to miniaturization. In addition, when the rotational speed of the external power is high, the generated voltage of the DC brushless motor is also high, resulting in damage exceeding the maximum rating of the inverter device.

  The present invention solves the above-mentioned conventional problems, and provides a hybrid compressor driving device that is small and lightweight and has no power loss of external power and does not break even at high rotational speeds of external power. Objective.

  In order to solve the above-described conventional problems, the hybrid compressor driving device of the present invention includes current blocking means for blocking current from the inverter circuit to the DC power source between the DC power source and the inverter circuit.

  As a result, the current generated by the DC brushless motor can be prevented from flowing to the direct current power source, so that no load is applied to the external power.

  When the rotational speed of the external power is high, the clutch is turned off and the compression unit is driven by a DC brushless motor.

  Thereby, it is possible to prevent a high voltage from being applied to the inverter device, and to maintain the compression function.

  The hybrid compressor drive device of the present invention is small and light with only one current blocking means, prevents unnecessary power consumption, and controls the clutch and inverter circuit to prevent high voltage and maintain the compression function. be able to.

  Therefore, there is obtained a compact and lightweight hybrid compressor driving device that does not cause power loss of external power and does not break even at a high rotational speed of external power.

The first invention includes current blocking means for blocking current from the inverter circuit to the DC power supply.
As a result, it is possible to prevent the generated current from flowing to the DC power supply, and thus it is possible to prevent an unnecessary load from being applied to the external power.

According to a second aspect of the present invention, in the hybrid compressor driving device of the first aspect, a smoothing capacitor for smoothing fluctuations of direct current in direct current to alternating current conversion of the inverter circuit is provided between the direct current power source and the current blocking means. Therefore, it is possible to prevent the generated current from flowing through the smoothing capacitor, so that it is possible to prevent the external power from being loaded. The third invention is the hybrid compressor driving device according to the first or second invention. The high speed of the external power is higher than a predetermined value, and before the generated voltage by the DC brushless motor exceeds the maximum rating of the inverter device, the clutch device is turned off to prevent a high voltage from being applied to the inverter device. Breakage can be prevented.

  According to a fourth aspect of the invention, in the hybrid compressor driving apparatus of the third aspect of the invention, voltage detection means for detecting the voltage of the DC power supply line connected to the inverter circuit is provided between the current blocking means and the inverter circuit. By detecting the voltage generated by the DC brushless motor, turning off the clutch before the voltage exceeds the maximum rating of the inverter device prevents high voltage from being applied to the inverter device and damages it. Can be prevented.

  A fifth aspect of the invention is the hybrid compressor driving apparatus of the first to fourth aspects of the invention, wherein the current blocking means is an opening / closing device, the opening / closing of the opening / closing device is closed while the inverter circuit is operating, and the inverter circuit is stopped. The DC power supply is closed when charging is necessary, and is opened when the DC power supply is not required, so that a high voltage can be prevented from being applied to the inverter device and damage can be prevented. Can also be charged.

  According to a sixth aspect of the present invention, in the hybrid compressor driving device according to the first to fourth aspects of the present invention, the current blocking means is a diode whose anode is the DC power supply side, so that the generated current can be generated with a simple and compact configuration. Since it can be prevented from flowing to the DC power supply, it is possible to prevent a load from being applied to the external power.

  According to a seventh aspect of the present invention, in the hybrid compressor driving device of the first, third, and fourth aspects, the current blocking means is a booster that boosts the DC voltage of the DC power supply, thereby reducing the power supply voltage of the inverter circuit. By making it higher than the generated voltage, it is possible to prevent the generated current from flowing to the DC power supply, so that it is possible to prevent the external power from being loaded.

In the eighth aspect of the invention, when the clutch is turned off in the hybrid compressor driving device of the third to seventh inventions, a high voltage is applied to the inverter device by operating the inverter circuit and driving the hybrid compressor. Can be prevented and breakage can be prevented, the compression function is maintained, and comfortable air conditioning can be continued.

  According to a ninth aspect of the present invention, in the hybrid compressor driving device of the first or second aspect, the current blocking means is a switching device, and the voltage detecting means for detecting the voltage of the DC power supply line connected to the inverter circuit is the switching device and the inverter. When the generated voltage by the DC brushless motor detected by the voltage detecting means is smaller than a predetermined value in a state where the inverter circuit is stopped and the switchgear is opened, the clutch is turned off and the switchgear is opened. With the closed, the inverter circuit is operated and the hybrid compressor is driven, so that the compression capacity is maintained even when the rotational speed of the external power is low and the compression capacity is insufficient, and comfortable air conditioning can be continued.

  According to a tenth aspect, in the first to ninth aspects, by using the external power as the driving power for the vehicle, the driving power can be effectively used, and the small and lightweight effect can be utilized.

  Hereinafter, embodiments of the present invention will be described by taking a vehicle air conditioner as an example with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is an electric circuit diagram of a hybrid compressor driving apparatus according to Embodiment 1 of the present invention. The system configuration diagram of the vehicle air conditioner in the embodiment of the present invention is obtained by replacing the inverter device 61 in FIG. The hybrid compressor is the same as in FIG.

  In FIG. 1, 1 is a battery, 10 is an inverter device, and 9 is a sensorless DC brushless motor (hereinafter referred to as a motor or a DC brushless motor). An inverter circuit 8 includes a plurality of inverter operation switching elements 2 connected to the battery 1 and an inverter operation diode 3.

  Here, regarding the switching element 2, the upper arm switching element is defined as U, V, W, and the lower arm switching element is defined as X, Y, Z, and the switching elements U, V, W, X, Y, Z are Corresponding diodes are defined as 3U, 3V, 3W, 3X, 3Y, 3Z.

  The DC brushless motor 9 includes a stator winding 4 and a magnet rotor 5.

  Reference numeral 6 denotes a current sensor for detecting a power supply current.

  11 is a relay (switching device) as current blocking means.

  A control circuit 7 controls the relay 11, the switching element 2 and the like based on a command from the air conditioner controller 62 (operation / stop rotation speed instruction value, etc.) and a signal from the current sensor 6 and the like. Bidirectional communication is performed with the air conditioner controller 62 to transmit and receive signals.

  The relay 11 is closed while the inverter circuit 8 is operating. A direct current is supplied from the battery 1 to the inverter circuit 8, converted into a three-phase (U, V, W) alternating current, and supplied to the DC brushless motor 9. Here, the detected current value of the current sensor 6 is sent to the control circuit 7 and used for power consumption calculation, position determination of the magnet rotor 5 from the phase current, protection of the switching element 2 and the like.

The relay 11 is closed when the inverter circuit 8 is stopped and the battery 1 needs to be charged. When the clutch 44 of the hybrid compressor 60 is ON, the magnet rotor 5 rotates and a three-phase AC voltage is generated in the stator winding 4. This three-phase AC voltage is three-phase full-wave rectified by a diode (3U, 3V, 3W, 3X, 3Y, 3Z), and a voltage having the same polarity as that of the battery 1 is generated in the power supply line of the battery 1. An example of the current flow is indicated by a dashed arrow. It flows from the negative side of the battery 1 to the diode 3Y, the V-phase winding, and the neutral point, and to the diode 3Z, the W-phase winding, and the neutral point. Then, it flows from the neutral point to the U-phase winding, the diode 3U, the relay 11, and the positive side of the battery 1 to be charged. Since this current flows through the stator winding 4, the magnetic flux generated by this current generates torque in the magnet rotor 5. Thus, torque is generated in the engine 69 and becomes a load.

  Therefore, when the inverter circuit 8 is stopped and the battery 1 does not need to be charged, the relay 11 is opened to cut off the path through which the charging current flows and prevent the engine 69 from generating a load. The inverter device 10 and the DC brushless motor 9 may be disconnected, but at least two relays are required. Therefore, it is possible to prevent wasteful power consumption with only one current blocking means, which is small and light.

(Embodiment 2)
FIG. 2 is an electric circuit diagram of the hybrid compressor driving apparatus according to Embodiment 2 of the present invention. Compared to FIG. 1, a smoothing capacitor 12 that smoothes fluctuation (ripple) of direct current in direct current to alternating current conversion of the inverter circuit 8 is provided between the battery 1 and a relay 11 as current blocking means. When the smoothing capacitor 12 is provided between the relay 11 and the inverter circuit 8, the generated current flows to the smoothing capacitor 12 even when the inverter circuit 8 is stopped and the relay 11 is opened when the battery 1 does not require charging. . Accordingly, the interruption of the path through which the charging current flows becomes incomplete. Therefore, when the smoothing capacitor 12 is required, it is preferable to provide it between the battery 1 and the relay 11. Thereby, the load generation to the engine 69 can be completely prevented.

When the inverter circuit 8 according to the first embodiment is stopped and the battery 1 is required to be charged and the relay 11 is closed, the generated voltage corresponding to the fluctuation in the rotational speed of the engine 69 as external power is the inverter. Applied to the device 10 (inverter circuit 8, smoothing capacitor 12, etc.). Therefore, it is assumed that the generated voltage exceeds the maximum rating of the inverter device 10. Therefore, the control circuit 7 or the air conditioner controller 62 calculates the rotational speed of the DC brushless motor 9 from the rotational speed signal of the engine 69 received from the vehicle controller, and calculates the generated voltage. Then, before the generated voltage exceeds the maximum rating of the inverter device 10, the air conditioner controller 62 turns off the clutch 44. Thereby, it can prevent that the voltage exceeding a maximum rating is applied to the inverter apparatus 10, and can prevent a failure | damage.
When the relay 11 is open, the inverter circuit 8 and the device between the relay 11 and the inverter circuit 8 can be protected.

(Embodiment 3)
FIG. 3 is an electric circuit diagram of the hybrid compressor driving apparatus according to Embodiment 3 of the present invention. Compared to FIG. 1, the voltage detection device 13 is provided between the relay 11 and the inverter circuit 8. The control circuit 7 sends a signal for stopping the clutch 44 to the air conditioner controller 62 before the generated voltage obtained from the voltage detection device 13 exceeds the maximum rating of the inverter device 10 (inverter circuit 8, voltage detection device 13, etc.). Send. Thereby, the air conditioner controller 62 turns off the clutch 44. Thereby, it can prevent that the voltage exceeding a maximum rating is applied to the inverter apparatus 10, and can prevent a failure | damage.

  The generated voltage can be detected even when the relay 11 is open. In this case, detection is possible even when the generated voltage is lower than the voltage of the battery 1.

  Further, the charge amount and discharge amount of the battery 1 are managed by detecting the current by the current sensor 6 and calculating the voltage from the rotation speed signal of the engine 69 or by the voltage detection device 13. Can be calculated and calculated. At this time, the current sensor 6 may detect a bidirectional current and determine the polarity in the direction of the current. Any of the control circuit 7, the air conditioner controller 62, and the vehicle controller can be performed by transmitting and receiving current and voltage signals.

(Embodiment 4)
FIG. 4 is an electric circuit diagram of a hybrid compressor driving apparatus according to Embodiment 4 of the present invention. Compared to FIG. 1, a diode 14 having an anode on the battery 1 (DC power supply) side is provided instead of the relay 11 as current blocking means. Thus, while the inverter circuit 8 is in operation, a direct current is supplied from the battery 1 to the inverter circuit 8, but the generated current (broken arrow in FIG. 1) is blocked. Therefore, since it is possible to prevent the generated current from flowing to the DC power supply with a simple and small configuration, it is possible to prevent the engine 69 from being loaded.

  FIG. 5 is obtained by adding the voltage detection device 13 in the third embodiment to FIG. The effect is the same as in Embodiment 3, but cannot be detected when the generated voltage is lower than the voltage of battery 1.

(Embodiment 5)
FIG. 6 is an electric circuit diagram of a hybrid compressor driving apparatus according to Embodiment 5 of the present invention. Compared to FIG. 1, a booster 15 is provided instead of the relay 11 as current blocking means. The voltage of the battery 1 is boosted, and the voltage applied to the inverter circuit 8 is made higher than the generated voltage. As a result, the generated current can be prevented from flowing into the battery 1. Thus, it is possible to prevent the engine 69 from being loaded.
By providing the boosting device, PAM modulation can be performed instead of PWM modulation, so that efficiency and maximum output can be increased.

(Embodiment 6)
FIG. 7 is a flowchart showing the operation of the hybrid compressor driving apparatus according to Embodiment 6 of the present invention. The electric circuit diagram corresponding to this flowchart is one of FIG. 1, FIG. 2, and FIG.

  The locations according to the present embodiment are steps 10, 20, 30, 31, 32, 33, 22, 23, and 24, which will be described in order.

  From the start, it is determined in step 10 whether an air conditioner is requested. This is determined by ON / OFF of the air conditioner switch 64.

  If there is no air conditioner request, the clutch 44 is turned off at step 11, the inverter circuit 8 is turned off, and the relay 11 is also turned off at step 12.

  If there is an air conditioner request, the process proceeds to step 20 to determine whether the engine 69 is on. This is determined by a vehicle controller (not shown).

  If the engine 69 is OFF, the process proceeds to step 21 to determine whether the battery 1 needs to be charged. This is determined by a vehicle controller (not shown).

If charging is required, the engine 69 is turned on (started) in step 25. Step 2
6, the relay 11 is turned ON, and the battery 1 is charged from the inverter circuit 8 via the relay 11. If there is a separate charging mechanism, it is conceivable that the engine 69 and the relay 11 are not specially operated as indicated by broken line arrows in the figure.

  If charging is unnecessary, the clutch 44 is turned off in step 22. In step 23, the relay 11 is turned on, and in step 24, the inverter circuit 8 is turned on. As a result, the hybrid compressor 60 is driven by the DC brushless motor 9 and the air conditioner operates.

  If the engine 69 is ON, the clutch 44 is turned ON at step 30. Thereby, the hybrid compressor 60 is driven by the engine 69, and the air conditioner operates.

  Next, the process proceeds to step 31 to determine whether or not the battery 1 needs to be charged. This is determined by a vehicle controller (not shown).

  If charging is necessary, the relay 11 is turned on in step 34, and the battery 1 is charged from the inverter circuit 8 via the relay 11.

  If charging is unnecessary, the relay 11 is turned off in step 32. Thereby, the load of the engine 69 is reduced.

  Moving to step 33, it is determined whether or not the generated voltage is a high voltage close to the maximum rating of the inverter device 10. The generated voltage can be detected by the calculation by the air conditioner controller 62 in the second embodiment or the voltage detection device 13 in the third embodiment.

  If the generated voltage is not high, the process returns to step 10 as it is.

  If the power generation voltage is high, the clutch 44 is stopped in step 22 to stop power generation as described in the second and third embodiments so that the power generation voltage does not reach or exceed the maximum rating of the inverter device 10. Is turned off (broken line arrow in the figure).

  In this case, the hybrid compressor 60 stops, the air conditioner stops, and the comfort is impaired. Therefore, the relay 11 is turned ON at step 23, and the inverter circuit 8 is turned ON at step 24. As a result, the hybrid compressor 60 is driven by the DC brushless motor 9 and the air conditioner operates. Therefore, comfortable air conditioning can be maintained.

(Embodiment 7)
Similar to the sixth embodiment, description will be made with reference to the flowchart of FIG. The locations according to the present embodiment are steps 10, 20, 30, 31, 32, 33, 22, 23, and 24.

  In the present embodiment, in step 33, it is determined whether or not the generated voltage is a low voltage. In step 32, since the relay 11 is OFF, the voltage detection device 13 can also detect a voltage lower than the voltage of the battery 1.

  If the generated voltage is not low, the process returns to step 10 as it is.

If the generated voltage is low, it is determined that the rotational speed of the engine 69 is low and the compression capacity of the hybrid compressor 60 is insufficient. Accordingly, the clutch 44 is turned off at step 22, the relay 11 is turned on at step 23, and the inverter circuit 8 is turned on at step 24. As a result, the hybrid compressor 60 is driven by the DC brushless motor 9 and the air conditioner operates. Therefore, comfortable air conditioning can be maintained. Further, since the efficiency of the engine 69 is low in the region where the rotational speed of the engine 69 is low, the fuel efficiency can be improved by this means.

  In each of the above embodiments, the motor drive source of the hybrid compressor is a DC brushless motor. However, a DC brush motor can also be applied because it has a power generation action. However, in this case, an inverter circuit is not necessary.

  As described above, the hybrid compressor driving device according to the present invention can use the two powers of the external power and the motor properly, prevent unnecessary power consumption, prevent high voltage, and maintain the compression function. The present invention can be applied not only to automobiles but also to railway vehicles, ships, airplanes and the like.

1 is an electric circuit diagram of a hybrid compressor driving device according to Embodiment 1 of the present invention. Electric circuit diagram of hybrid compressor driving apparatus according to Embodiment 2 of the present invention Electric circuit diagram of hybrid compressor driving apparatus according to Embodiment 3 of the present invention Electric circuit diagram of hybrid compressor driving apparatus according to Embodiment 4 of the present invention Other electrical diagrams Electric circuit diagram of hybrid compressor driving apparatus according to Embodiment 5 of the present invention The flowchart which shows the action | operation of the hybrid compressor drive device in Embodiment 6, 7 of this invention. System configuration diagram of a vehicle air conditioner equipped with a conventional hybrid compressor Cross section of conventional hybrid compressor Arrangement diagram showing arrangement of conventional air conditioner in vehicle

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery 2 Inverter operation switching element 3 Inverter operation diode 5 Magnet rotor 8 Inverter circuit 9 DC brushless motor 10 Inverter device 11 Relay 12 Smoothing capacitor 13 Voltage detection device 14 Diode 15 Booster device 44 Clutch 60 Hybrid compressor 69 Engine

Claims (10)

A DC brushless motor having a magnet rotor as a drive source, and a clutch for turning on / off a power connection with an external power as a drive source, wherein either the DC brushless motor or the external power is a drive source And an inverter device that converts a direct current from a direct current power source that drives the DC brushless motor and outputs an alternating current, the inverter device comprising an inverter for orthogonal transformation and an diode A current blocking means for blocking current from the inverter circuit to the DC power supply between the DC power supply and the inverter circuit, and the external power drives the hybrid compressor when the clutch is turned on. When the DC brushless motor is a generator Actuates Te, hybrid compressor driving apparatus characterized by blocking current to the DC power source from the inverter circuit. The hybrid compressor driving device according to claim 1, wherein a smoothing capacitor that smoothes fluctuations of direct current in direct current to alternating current conversion of the inverter circuit is provided between the direct current power source and the current blocking means. The clutch is turned off before the generated voltage by the DC brushless motor exceeds the maximum rating of the inverter device when the clutch is on and the rotational speed of the external power is higher than a predetermined value. Item 3. The hybrid compressor drive device according to Item 2. The voltage detection means for detecting the voltage of a DC power supply line connected to the inverter circuit is provided between the current blocking means and the inverter circuit, and the generated voltage by the DC brushless motor is detected. Hybrid compressor drive device. The current blocking means is a switchgear, and the switchgear is closed when the inverter circuit is in operation, and the DC power supply is closed when the inverter circuit is stopped and the DC power supply is required for charging. The hybrid compressor driving device according to any one of claims 1 to 4, which is opened when charging is not required. The hybrid compressor driving apparatus according to any one of claims 1 to 4, wherein the current blocking means is a diode having an anode on the DC power supply side. 5. The hybrid compressor driving device according to claim 1, wherein the current blocking unit is a boosting device that boosts a DC voltage of the DC power supply. 6. The hybrid compressor driving device according to any one of claims 3 to 7, wherein when the clutch is turned off, the inverter circuit is operated to drive the hybrid compressor. The current blocking means is a switching device, and voltage detection means for detecting the voltage of a DC power supply line connected to the inverter circuit is provided between the switching device and the inverter circuit, and the switching circuit is open when the inverter circuit is stopped. When the voltage generated by the DC brushless motor detected by the voltage detection means is smaller than a predetermined value in a state where the device is open, the clutch is turned off, the opening / closing device is closed, and the inverter circuit is operated. The hybrid compressor driving device according to claim 1 or 2, wherein the hybrid compressor is driven. The hybrid compressor driving apparatus according to any one of claims 1 to 9, wherein the external power is driving power for a vehicle.

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