WO2023248708A1

WO2023248708A1 - Composite device

Info

Publication number: WO2023248708A1
Application number: PCT/JP2023/019681
Authority: WO
Inventors: 龍之介関
Original assignee: サンデン株式会社
Priority date: 2022-06-22
Filing date: 2023-05-26
Publication date: 2023-12-28
Also published as: JP2024001533A

Abstract

[Problem] To provide a composite device that can contribute to miniaturization of a vehicle air conditioning device, etc., and to suppress malfunctions, etc., of electronic circuits mounted therein. [Solution] This composite device 1 comprises: a first housing 2A in which a compression mechanism 3 for compressing a refrigerant and an electric motor 4 for driving the compression mechanism 3 are accommodated; a second housing 2B in which an electric heater 5 for heating a heat medium is accommodated; and a third housing 2C in which a motor drive circuit 20, a heater control circuit 30, and a power supply circuit 50 that generates power to be supplied to the motor drive circuit 20 and the heater control circuit are accommodated. The drive frequency of first switching elements Q1-Q6 of the motor drive circuit 20, the drive frequency of second switching elements Q7, Q8 of the heater control circuit 30, and the drive frequency of a third switching element Q9 of the power supply circuit 50 are set so as not to overlap each other.

Description

complex device

The present invention relates to a composite device having a refrigerant compression function and a heat medium heating function.

Patent Document 1 describes a vehicle air conditioner that can be applied to vehicles such as hybrid cars and electric cars. The vehicle air conditioner described in Patent Document 1 includes an electric compressor that compresses refrigerant, a radiator that radiates heat from the refrigerant discharged from the electric compressor to heat air supplied into the vehicle interior, and a heat radiator that heats the air supplied into the vehicle interior. The refrigerant circuit includes an expansion valve that expands the refrigerant under reduced pressure, and a heat exchanger that corresponds to an evaporator that exchanges heat between the refrigerant that has been expanded under reduced pressure and the outside air. In addition, the vehicle air conditioner described in Patent Document 1 includes a heat medium heating electric heater that heats a heat medium and a heated heat medium that is supplied into the vehicle interior in order to assist heating of the vehicle interior by a radiator. and a heat medium-air heat exchanger that heats the air.

Japanese Patent Application Publication No. 2014-213765

The vehicle air conditioner described in Patent Document 1 can compensate for the lack of heating capacity due to the radiator. However, in the vehicle air conditioner described in Patent Document 1, an electric compressor, a heat medium heating electric heater, and the like are individually provided. As a result, the overall size of the device has increased, and there is room for improvement in terms of installation space and other aspects.

An object of the present invention is to provide a composite device that can contribute to miniaturization of vehicle air conditioners, etc., and to suppress malfunctions of electronic circuits installed therein.

According to one aspect of the present invention, a composite device having a refrigerant compression function and a heat medium heating function is provided. The composite device houses a compression mechanism that compresses a refrigerant and an electric motor that drives the compression mechanism, and also has a refrigerant inlet that allows the refrigerant to flow into the inside, and a refrigerant that allows the refrigerant compressed by the compression mechanism to flow out to the outside. A compressor housing having an outlet, an electric heater for heating a heat medium housed therein, a heat medium inlet for causing the heat medium to flow into the inside, and a heat medium for causing the heat medium heated by the electric heater to flow out to the outside. a heater housing having a medium outlet; a motor drive circuit that drives the electric motor; a heater control circuit that controls the electric heater; and a control circuit that controls the operation of the motor drive circuit and the heater control circuit. , a circuit housing that accommodates therein the motor drive circuit, the heater control circuit, and a power supply circuit that generates power to be supplied to the control circuit. The compressor housing, the heater housing and the circuit housing are integrally coupled. The motor drive circuit, the heater control circuit, and the power supply circuit each include a switching element, and the drive frequency of the switching element of the motor drive circuit, the drive frequency of the switching element of the heater control circuit, and the power supply circuit are different from each other. The drive frequencies of the switching elements are set so that they do not overlap with each other.

According to the present invention, it is possible to provide a composite device that can contribute to downsizing of vehicle air conditioners and the like. Furthermore, malfunctions of electronic circuits (motor drive circuit, heater control circuit, power supply circuit, etc.) mounted on the multifunction device can be suppressed.

FIG. 1 is a front view of a multifunction device according to an embodiment. FIG. 2 is a right side view of the multifunction device according to the embodiment. FIG. 1 is a top view of a multifunction device according to an embodiment. 3 is a partial schematic sectional view of the composite device according to the embodiment, and is a view corresponding to the AA sectional view of FIG. 2. FIG. 1 is a diagram illustrating an example of a main part configuration of a motor drive circuit of a multifunction device according to an embodiment. FIG. 2 is a diagram illustrating an example of a main part configuration of a heater control circuit of a multifunction device according to an embodiment. 1 is a diagram illustrating an example of a main part configuration of a power supply circuit of a multifunction device according to an embodiment; FIG. FIG. 3 is a circuit block diagram of a circuit board of the multifunction device according to the embodiment. 4 is a partial schematic sectional view of the composite device according to the embodiment, and is a view corresponding to the BB sectional view of FIG. 3. FIG.

Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

1 to 4 show a schematic configuration of a multifunction device 1 according to an embodiment of the present invention. FIG. 1 is a front view of the multifunction device 1 according to the embodiment, FIG. 2 is a right side view of the multifunction device 1 according to the embodiment, and FIG. 3 is a top view of the multifunction device 1 according to the embodiment. 4 is a partial schematic sectional view of the composite device according to the embodiment, and is a view corresponding to the AA sectional view of FIG. 2.

The composite device 1 according to the embodiment has a refrigerant compression function that compresses a refrigerant, and a heat medium heating function that heats a heat medium other than the refrigerant. That is, the composite device 1 has a configuration in which a refrigerant compressor and a heat medium heating device are integrated.

The composite device 1 can be applied to a vehicle air conditioner as described above. That is, the composite device 1 can be used by being incorporated into a refrigerant circuit in which a refrigerant circulates, and a heat medium circuit in which a heat medium is circulated by a pump section including an electric pump or the like. For example, the refrigerant compression function section of the composite device 1 is incorporated in the refrigerant circuit, compresses the refrigerant that has passed through the expansion valve and the evaporator (or a heat exchanger equivalent to this), and also compresses the compressed refrigerant. , may be configured to supply a radiator (refrigerant-air heat exchanger) that heats air supplied into the vehicle interior. The heat medium heating function section of the composite device 1 is incorporated in the heat medium circuit and heats the heat medium that has passed through the heat medium-air heat exchanger that heats the air supplied into the vehicle interior. The heating medium may be configured to supply the heating medium to the heating medium-air heat exchanger. Note that the refrigerant and the heat medium may be selected arbitrarily, and for example, a gas refrigerant may be used as the refrigerant, and a liquid may be used as the heat medium. Furthermore, although not particularly limited, water (including water mixed with antifreeze or the like) is usually used as the heat medium. Therefore, the heat medium heating function (heat medium heating device) may also be referred to as a water heating function (water heating device).

Referring to FIGS. 1 to 4, the composite device 1 has a housing 2. As shown in FIG. The housing 2 of the composite device 1 includes a first housing 2A, a second housing 2B, a third housing 2C, a first cover 2D, a second cover 2E, and a third cover 2F, which are not shown. They are integrally connected (fastened) using fastening members such as bolts.

The first housing 2A is formed into a substantially cylindrical shape. A compression mechanism 3 that compresses refrigerant and an electric motor 4 that drives the compression mechanism 3 are housed in the first housing 2A in series in the axial direction. Although not particularly limited, the compression mechanism 3 may be a scroll compression mechanism including a fixed scroll and a movable (orbiting) scroll. Further, the output shaft 4a of the electric motor 4 is connected to the compression mechanism 3 (for example, the movable (orbiting) scroll).

One of the two open ends of the first housing 2A (the lower open end in FIGS. 1 and 2), that is, the open end of the first housing 2A on the compression mechanism 3 side is connected to the first cover. occluded by 2D. Note that the first housing 2A that houses the compression mechanism 3 and the electric motor 4 that drives it may also be referred to as a "compressor housing."

The second housing 2B is arranged on the side of the first housing 2A. The second housing 2B is formed into a substantially rectangular cylindrical shape. An electric heater 5 that heats the heat medium is housed inside the second housing 2B.

One of the two open ends of the second housing 2B (the lower open end in FIGS. 1 and 2) is closed by the second cover 2E. Note that the second housing 2B that accommodates the electric heater 5 may also be referred to as a "heater housing."

The third housing 2C is formed into a box shape with an open top surface. Inside the third housing 2C, there are a motor drive circuit 20 that drives (controls) the electric motor 4, a heater control circuit 30 that controls the electric heater 5, and a motor drive circuit 20 that controls the operation of the motor drive circuit 20 and the operation of the heater control circuit 30. A control circuit 40 for controlling and a power supply circuit 50 for generating power to be supplied to the motor drive circuit 20, the heater control circuit 30, and the control circuit 40 are housed. Specifically, in this embodiment, one circuit board 6 on which these motor drive circuit 20, heater control circuit 30, control circuit 40, and power supply circuit 50 are mounted is housed inside the third housing 2C.

The bottom wall 7 of the third housing 2C is connected to the other open end of the first housing 2A (the upper open end in FIGS. 1 and 2), that is, the open end of the first housing 2A on the electric motor 4 side, and the second The other open end (the upper open end in FIGS. 1 and 2) of the housing 2B is closed. Thereby, the inside of the first housing 2A and the inside of the third housing 2C are partitioned off, and the inside of the second housing 2B and the inside of the third housing 2C are partitioned off. That is, the bottom wall 7 of the third housing 2C has a first partition part 71 that partitions the inside of the first housing 2A and the inside of the third housing 2C, and a first partition part 71 that partitions the inside of the second housing 2B and the inside of the third housing 2C. It has a second partition part 72 for partitioning.

The upper surface (opening end) of the third housing 2C is closed by the third cover 2F. Note that the third housing 2C that houses the motor drive circuit 20, heater control circuit 30, control circuit 40, and power supply circuit 50 (specifically, the circuit board 6 on which these are mounted) is referred to as a "circuit housing" or a "board housing". ” can also be called.

In the composite device 1, the refrigerant compression function (refrigerant compressor) is mainly realized by the compression mechanism 3, the electric motor 4, and the motor drive circuit 20, and the heat medium heating function is mainly realized by the electric heater 5 and the heater control circuit 30. (heat medium heating device) is realized.

A refrigerant inlet 8 for allowing the refrigerant circulating in the refrigerant circuit to flow into the first housing 2A is formed in the first housing 2A. The refrigerant to be introduced is, for example, a refrigerant that has passed through an expansion valve and an evaporator (or a heat exchanger equivalent thereto), that is, a low-temperature, low-pressure refrigerant. In this embodiment, the refrigerant inlet 8 is located in a portion of the first housing 2A on the third housing 2C side, that is, in the vicinity of the first partition portion 71 that partitions the inside of the first housing 2A and the inside of the third housing 2C. It is provided. Preferably, the refrigerant inlet 8 is configured to cause the refrigerant circulating in the refrigerant circuit to flow into the first housing 2A so that at least a portion of the refrigerant flows along the first partition portion 71.

The (low-temperature, low-pressure) refrigerant that has flowed into the first housing 2A through the refrigerant inlet 8 flows inside the first housing 2A and is sucked into the compression mechanism 3. The refrigerant sucked into the compression mechanism 3 is compressed by the compression mechanism 3, and is discharged from the compression mechanism 3 as a high-temperature, high-pressure refrigerant. The discharged (high temperature and high pressure) refrigerant flows out from the refrigerant outlet 9 formed in the first housing 2A, and is supplied to, for example, the above-mentioned radiator (refrigerant-air heat exchanger).

In this embodiment, the refrigerant outlet 9 is provided in a portion of the first housing 2A on the first cover 2D side, that is, at a position away from the refrigerant inlet 8 in the vertical direction in FIGS. 1 and 2. Therefore, in this embodiment, the refrigerant that has flowed into the first housing 2A from the refrigerant inlet 8 flows from the upper side to the lower side in FIGS. 1 and 2 within the first housing 2A.

Note that the first partition part 71 can be cooled by the (low temperature, low pressure) refrigerant flowing into the first housing 2A through the refrigerant inlet 8, and the electric motor 4 can be cooled by the refrigerant flowing inside the first housing 2A. May be cooled. Further, the refrigerant inlet 8, the inside of the first housing 2A, and the refrigerant outlet 9 constitute a part of the refrigerant circuit.

A heat medium inlet 10 is formed in the second housing 2B for allowing the heat medium circulating in the heat medium circuit to flow into the second housing 2B. The heat medium to be introduced is, for example, a heat medium that has passed through the above-described heat medium-air heat exchanger, that is, a low-temperature heat medium. In the present embodiment, the heat medium inlet 10 is located at a portion of the second housing 2B on the third housing 2C side, that is, near the second partition portion 72 that partitions the inside of the second housing 2B and the inside of the third housing 2C. and is provided on the back side in FIG. 1 (on the right side in FIG. 2). Preferably, the heat medium inlet 10 is configured to cause the heat medium circulating in the heat medium circuit to flow into the second housing 2B so that at least a portion of the heat medium flows along the second partition portion 72. has been done.

The (low-temperature) heat medium that has flowed into the second housing 2B through the heat medium inlet 10 flows inside the second housing 2B and is heated by the electric heater 5 to raise its temperature. The heated heat medium flows out from the heat medium outlet 11 formed in the second housing 2B, and is supplied to, for example, the above-mentioned heat medium-air heat exchanger.

In this embodiment, the heat medium outlet 11 is located near the second partition part 72 that partitions the inside of the second housing 2B and the inside of the third housing 2C, and on the near side in FIG. 1 (left side in FIG. 2). It is set in. Therefore, in the present embodiment, the heat medium flowing into the second housing 2B from the heat medium inlet 10 flows inside the second housing 2B from the right side in FIGS. 2 and 4 along the second partition part 72. flows towards the left.

Note that the second partition portion 72 may be cooled by the (low-temperature) heat medium flowing into the second housing 2B through the heat medium inlet 10. Further, the heat medium inlet 10, the inside of the second housing 2B, and the heat medium outlet 11 constitute a part of the heat medium circuit.

Although not shown in the figure, the power supply line from the motor drive circuit 20 to the electric motor 4 and the power supply line from the heater control circuit 30 to the electric heater 5 are connected to the third housing in an airtight and liquidtight state, respectively. It extends through the bottom wall 7 of 2C.

Next, the motor drive circuit 20, heater control circuit 30, control circuit 40, and power supply circuit 50 will be explained.

The motor drive circuit 20 drives (controls) the electric motor 4 by converting a DC voltage from a high voltage power source HV such as a high voltage battery mounted on a vehicle into a three-phase AC voltage and supplying the voltage to the electric motor 4. It is configured as follows. FIG. 5 is a diagram showing an example of the main part configuration of the motor drive circuit 20. As shown in FIG. As shown in FIG. 5, the motor drive circuit 20 includes a smoothing capacitor 21, a first power module 22, and a first driver 23.

The smoothing capacitor 21 is connected between the power line of the high voltage power supply HV and the ground line, and smoothes the DC voltage from the high voltage power supply HV.

The first power module 22 includes six power switching elements (hereinafter referred to as "first switching elements") Q1 to Q6 and six diodes D1 to D6. Although not particularly limited, the first switching elements Q1 to Q6 may be IGBTs (insulated gate bipolar transistors). The first power module 22 converts the DC voltage from the high voltage power supply HV into a three-phase AC voltage and supplies it to the electric motor 4 by subjecting the first switching elements Q1 to Q6 to PWM control.

Specifically, the first power module 22 has a U-phase arm, a V-phase arm, and a W-phase arm that are provided in parallel with each other between the power line of the high-voltage power supply HV and the ground line.

Two first switching elements Q1 and Q2 are connected in series to the U-phase arm, and diodes D1 and D2 are connected in antiparallel to each of the first switching elements Q1 and Q2, respectively.

Two first switching elements Q3 and Q4 are connected in series to the V-phase arm, and diodes D3 and D4 are connected in antiparallel to each of the first switching elements Q3 and Q4, respectively.

Two first switching elements Q5 and Q6 are connected in series to the W-phase arm, and diodes D5 and D6 are connected in antiparallel to each of the first switching elements Q5 and Q6, respectively.

Furthermore, the intermediate points of the U, V, and W phase arms are connected to the other ends of the U, V, and W phase coils of the electric motor 4, which are star-connected at one end of each. That is, the midpoint between the first switching elements Q1 and Q2 of the U-phase arm is connected to the U-phase coil, the midpoint of the first switching elements Q3 and Q4 of the V-phase arm is connected to the V-phase coil, and the W-phase A midpoint between the first switching elements Q5 and Q6 of the arm is connected to the W-phase coil.

Therefore, the first power module 22 has a ratio of the ON period of the first switching elements Q1, Q3, Q5 on the power line side of each phase arm to the ON period of the first switching elements Q2, Q4, Q6 on the ground line side. is controlled (PWM controlled), the DC voltage from the high voltage power supply HV smoothed by the smoothing capacitor 21 can be converted into a three-phase AC voltage and supplied to the electric motor 4. Accordingly, the electric motor 4 and the compression mechanism 3 can be driven.

The first driver 23 turns ON/OFF (switches) the first switching elements Q1 to Q6 (gates thereof) based on a control signal (PWM signal) from the control circuit 40.

That is, in this embodiment, the operation of the motor drive circuit 20 (switching operation of the first switching elements Q1 to Q6), and furthermore, the operation of the electric motor 4 and the compression mechanism 3 (that is, the refrigerant compression function) is controlled by the control circuit 40. It's about to be controlled.

The heater control circuit 30 is configured to apply the voltage of the high voltage power supply HV to the electric heater 5. FIG. 6 is a diagram showing an example of the main part configuration of the heater control circuit 30. As shown in FIG. As shown in FIG. 6, the heater control circuit 30 includes a second power module 31 and a second driver 32. Although not shown, a smoothing capacitor may be connected between the power line of the high voltage power supply HV and the ground line, similar to the motor drive circuit 20.

The second power module 31 includes two power switching elements (hereinafter referred to as "second switching elements") Q7 and Q8 that control energization to the electric heater 5. The second switching elements Q7 and Q8 may be IGBTs like the first switching elements Q1 to Q6 of the motor drive circuit 20. In this embodiment, one of the two second switching elements Q7 and Q8 is provided on the output side (voltage side) of the high voltage power supply HV than the electric heater 5, and the other second switching element Q7 is provided on the output side (voltage side) of the high voltage power supply HV than the electric heater 5. The switching element Q8 is provided closer to the ground side of the high voltage power supply HV than the electric heater 5 is.

The second power module 31 turns ON/OFF the current between the high voltage power supply HV and the electric heater 5 by controlling the second switching elements Q7 and Q8 (PWM control). , and further the temperature of the heat medium heated by the electric heater 5 can be controlled.

The second driver 32 turns ON/OFF (switches) the second switching elements Q7 and Q8 (gates thereof) based on a control signal (PWM signal) from the control circuit 40.

That is, in this embodiment, the operation of the heater control circuit 30 (second switching elements Q7, Q8) and, by extension, the operation of the electric heater 5 (thermal medium heating function) are controlled by the control circuit 40. .

The control circuit 40 outputs a control signal to the first driver 23 in response to a request for operation of the refrigerant compression function from a higher-level control device (for example, the control device for the above-mentioned vehicle air conditioner), which is not shown, to heat the heat medium. It is configured to output a control signal to the second driver 32 in accordance with a functional operation request. Although not particularly limited, in this embodiment, the control circuit 40 is configured with a microcontrol unit (MCU).

The power supply circuit 50 is, for example, a switching type DC-DC converter, and generates predetermined DC voltages (15V and 5V) by switching a low-voltage power supply LV (DC12V in this case) such as a low-voltage battery mounted on a vehicle. It is configured to supply the generated DC voltage to a motor drive circuit 20, a heater control circuit 30, and a control circuit (MCU) 40. In this embodiment, the 15V DC voltage generated by the power supply circuit 50 is supplied to the first driver 23 of the motor drive circuit 20 and the second driver 32 of the heater control circuit 30, and the 5V DC voltage generated by the power supply circuit 50 is The DC voltage is supplied to a control circuit (MCU) 40.

FIG. 7 is a diagram showing an example of the configuration of main parts of the power supply circuit 50. As shown in FIG. 7, power supply circuit 50 includes a switching transformer 51. The switching transformer 51 is an insulating transformer, and has a primary winding 52 and a secondary winding 53 insulated from the primary winding 52.

A winding end 52B of the primary winding 52 is connected to a power supply line 54 of a low voltage power supply LV, and a winding start end 52A of the primary winding 52 is connected to a winding end 52A of the primary winding 52 via a switching element (hereinafter referred to as "third switching element") Q9. It is connected to the ground line 56 of the low voltage power supply LV. Although not particularly limited, the third switching element Q9 may be a MOSFET (metal oxide semiconductor field effect transistor).

The ON/OFF operation (switching operation) (of the gate) of the third switching element Q9 is controlled by the power supply circuit controller 55. The power supply circuit controller 55 is supplied with DC voltage from the low voltage power supply LV. Note that a smoothing capacitor 57 is connected between the power line 54 of the low voltage power source LV and the ground line 56.

The secondary winding 53 has a first winding part 58 and a second winding part 59. A winding start end 58A of the first winding portion 58 is connected to a first power output line (15V line) 60 via a diode D7. A winding end 58B of the first winding portion 58 is connected to a second power output line (5V line) 62 via a diode D8 and a regulator (LDO: low dropout regulator) 61. Further, the winding start end 59A of the second winding part 59 is connected to the winding end 58B of the first winding part 58, and the winding end 59B of the second winding part 59 connects the secondary side ground line 63. It is connected to secondary ground (SGND) through the terminal.

The first driver 23 of the motor drive circuit 20 and the second driver 32 of the heater control circuit 30 are connected to the first power output line 60, and the control circuit (MCU) 40 is connected to the second power output line 62. Ru.

Note that a smoothing capacitor 64 is connected between the first power output line 60 and the secondary ground line 63, and the second power output line 62 before and after the regulator 61 and the secondary ground line 63 are connected to each other.

Smoothing capacitors

65 and 66 are connected between them, respectively. Further, in this embodiment, the winding end 52B side of the primary winding 52 of the switching transformer 51 and the winding end 59B side of the second winding portion 59 of the secondary winding 53 are connected to each other via the coupling capacitor 67. are combined.

The power supply circuit controller 55 controls the switching operation of the third switching element Q9 according to the turns ratio of the switching transformer 51 so that DC 15V is output to the first power supply output line 60. As a result, DC 15V is supplied to the first driver 23 of the motor drive circuit 20 and the second driver 32 of the heater control circuit 30. Further, DC 5V is supplied to the control circuit (MCU) 40 via a regulator 61 from an intermediate output according to the turns ratio between the first winding section 58 and the second winding section 59 of the secondary winding 53. .

As described above, in this embodiment, the motor drive circuit 20, heater control circuit 30, control circuit (MCU) 40, and power supply circuit 50 are mounted on one circuit board 6. Note that FIG. 8 is a circuit block diagram of the circuit board 6.

Next, the arrangement structure of the first switching elements Q1 to Q6 of the motor drive circuit 20 and the second switching elements Q7 and Q8 of the heater control circuit 30 in the multifunction device 1 according to the embodiment will be described with reference to FIG. FIG. 9 is a partial schematic cross-sectional view of the composite device 1 (corresponding to the BB cross-sectional view in FIG. 3).

As described above, the circuit board 6 on which the motor drive circuit 20, the heater control circuit 30, the control circuit (MCU) 40, and the power supply circuit 50 are mounted is provided inside the third housing 2C, as shown in FIG. It can be attached to a plurality of board attachment parts 12 that are attached to each other. In this embodiment, each of the plurality of board mounting parts 12 is formed in a boss shape that protrudes from the bottom wall 7 of the third housing 2C (in the direction away from the first housing 2A and the second housing 2B). A circuit board 6 is attached to the upper surface of the board attachment part 12 with screws 13.

In this embodiment, the first switching elements Q1 to Q6 of the motor drive circuit 20 and the second switching elements Q7 and Q8 of the heater control circuit 30 are connected from the refrigerant inlet 8 into the first housing 2A in the third housing 2C. It is arranged at a position where it can be cooled by the inflowing refrigerant.

Specifically, the first switching elements Q1 to Q6 of the motor drive circuit 20 and the second switching elements Q7 and Q8 of the heater control circuit 30 are connected to the bottom of the third housing 2C of the circuit board 6 attached to the board mounting part 12. It is mounted on the surface on the wall 7 side and is in thermal contact with a first partition portion 71 that partitions the inside of the first housing 2A and the inside of the third housing 2C. Note that "being in thermal contact with the first partition part 71" means being in a state where heat exchange is possible with the first partition part 71, and being in direct contact with the first partition part 71. This includes being close enough to the first partition part 71 to allow heat exchange, and indirectly contacting the first partition part 71 via a heat exchange member with high thermal conductivity. It will be done.

By the way, in the third housing 2C, the first switching elements Q1 to Q6 of the motor drive circuit 20, the second switching elements Q7 and Q8 of the heater control circuit 30, and the third switching element Q9 of the power supply circuit 50 are set respectively. It is driven at a different drive frequency (also called switching frequency). That is, the first switching elements Q1 to Q6 of the motor drive circuit 20 are driven at the drive frequency (hereinafter referred to as "first drive frequency") f1 for the first switching elements Q1 to Q6, and the second The switching elements Q7 and Q8 are driven at a driving frequency (hereinafter referred to as "second driving frequency") f2 for the second switching elements Q7 and Q8, and the third switching element Q9 of the power supply circuit 50 is driven at a driving frequency f2 for the second switching elements Q7 and Q8. (hereinafter referred to as "third drive frequency").

Here, if the first drive frequency f1 and the second drive frequency f2 overlap, the first drive frequency f1 and the third drive frequency f3 overlap, or the second drive frequency f2 and the third drive frequency f3 overlap, This may lead to an increase in the noise level or malfunction of the circuit.

Therefore, in this embodiment, the first drive frequency f1, the second drive frequency f2, and the third drive frequency f3 are set so as not to overlap (shift) with each other. In other words, the first drive frequency (first switching frequency) f1, the second drive frequency (second switching frequency) f2, and the third drive frequency (third switching frequency) f3 are set such that they do not affect each other, that is, , are set so that no interference or resonance occurs between them.

Basically, considering the performance required for each circuit, the first drive frequency f1 of the first switching elements Q1 to Q6 of the motor drive circuit 20 is set to the first drive frequency f1 of the first switching elements Q1 to Q6 of the heater control circuit 30. The third drive frequency f3 of the third switching element Q9 of the power supply circuit 50 is set higher than the second drive frequency f2 by one order or more, and the third drive frequency f3 of the third switching element Q9 of the power supply circuit 50 is higher than the first drive frequency f1 of the first switching elements Q1 to Q6 of the motor drive circuit 20. will also be set more than an order of magnitude higher.

For example, the first driving frequency f1 is set to a frequency on the order of several tens of kHz (10 to 99 kHz), the second driving frequency f2 is set to a frequency on the order of several tens of Hz (10 to 99 Hz), and the third driving frequency f3 is set to a frequency on the order of several tens of kHz (10 to 99 Hz). , can be set to a frequency on the order of several hundred kHz (100 to 999 kHz). Although not particularly limited, by way of example, the first drive frequency f1 may be 10 to 20 kHz, the second drive frequency f2 may be 50 to 65 Hz, and the third drive frequency f3 may be 150 to 200 kHz.

According to the multifunction device 1 according to the embodiment, the following effects can be obtained.

The composite device 1 according to the embodiment includes a first housing (1) that houses in series a compression mechanism 3 that compresses a refrigerant and an electric motor 4 that drives the compression mechanism 3, and has a refrigerant inlet 8 and a refrigerant outlet 9. A compressor housing) 2A, a second housing (heater housing) 2B that houses an electric heater 5 for heating a heat medium and has a heat medium inlet 10 and a heat medium outlet 11, and drives an electric motor 4. a motor drive circuit 20 that controls the electric heater 5; a heater control circuit 30 that controls the electric heater 5; a control circuit (MCU) 40 that controls the operation of the motor drive circuit 20 and the heater control circuit 30; It includes a third housing (circuit housing) 2C that houses therein a power supply circuit 50 that generates power to be supplied to the circuit 30 and the control circuit (MCU) 40. The first housing (compressor housing) 2A, the second housing 2B (heater housing), and the third housing (circuit housing) 2C are integrally connected.

Such a composite device 1 can function as a refrigerant compressor (electric compressor) that compresses a refrigerant and a heat medium heating device that heats a heat medium, and can heat the heat medium while compressing the refrigerant. Can be done. Therefore, the composite device 1 can be applied to a vehicle air conditioner as described above. By applying the composite device 1 to a vehicle air conditioner, it is possible to downsize the vehicle air conditioner compared to a conventional configuration that separately includes an electric compressor and a heat medium heating device. It is.

Here, the motor drive circuit 20 includes first switching elements Q1 to Q6 that convert a DC voltage into a three-phase AC voltage, and the heater control circuit 30 includes a second switching element that turns ON/OFF energization to the electric heater 5. Including Q7 and Q8. Further, the power supply circuit 50 is configured with a switching type DC-DC converter, and includes a third switching element Q9. The motor drive circuit 20, the heater control circuit 30, the control circuit 40, and the power supply circuit 50 are mounted on one circuit board 6, and the first switching elements Q1 to Q6 of the motor drive circuit 20 are first driven. The frequency f1, the second drive frequency f2 of the second switching elements Q7 and Q8 of the heater control circuit 30, and the third drive frequency f3 of the third switching element Q9 of the power supply circuit 50 are set so as not to overlap with each other. . Preferably, the first drive frequency f1 is set to a frequency on the order of several 10 kHz, the second drive frequency f2 is set to a frequency on the order of several 10 Hz, and the third drive frequency f3 is set to a frequency on the order of several 100 kHz.

Therefore, malfunction of each circuit can be prevented without complicating or increasing the size of the third housing (circuit housing) 2C, and stable operation of the multifunction device 1 can be ensured.

Note that, in the above description, the case where the composite device 1 is mainly applied to a vehicle air conditioner is described. However, it is not limited to this. The composite device 1 can be applied to various devices and systems that utilize an electric compressor that compresses a refrigerant and a heat medium heating device that heats a heat medium.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that modifications and changes can be made based on the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1... Compound device, 2... Housing, 2A... First housing (compressor housing), 2B... Second housing (heater housing), 2C... Third housing (circuit housing), 3... Compression mechanism, 4... Electric motor, 5... Electric heater, 6... Circuit board, 7... Bottom wall, 8... Refrigerant inlet, 9... Refrigerant outlet, 10... Heat medium inlet, 11... Heat medium outlet, 20... Motor drive circuit, 30... Heater Control circuit, 40... Control circuit, 50... Power supply circuit, Q1 to Q6... First switching element (switching element of the motor drive circuit), Q7, Q8... Second switching element (switching element of the heater control circuit), Q9... 3 switching elements (switching elements of power supply circuit)

Claims

A composite device having a refrigerant compression function and a heat medium heating function,
A compression mechanism that compresses a refrigerant and an electric motor that drives the compression mechanism are housed inside, and a refrigerant inlet that allows the refrigerant to flow into the inside and a refrigerant outlet that allows the refrigerant compressed by the compression mechanism to flow out to the outside. a compressor housing;
A heater housing that houses an electric heater that heats a heat medium therein, and has a heat medium inlet that causes the heat medium to flow into the interior, and a heat medium outlet that causes the heat medium heated by the electric heater to flow out to the outside;
a circuit housing that houses therein a motor drive circuit that drives the electric motor, a heater control circuit that controls the electric heater, and a power supply circuit that generates power to be supplied to the motor drive circuit and the heater control circuit;
including;
the compressor housing, the heater housing and the circuit housing are integrally coupled;
The motor drive circuit, the heater control circuit, and the power supply circuit each include a switching element,
The driving frequency of the switching element of the motor drive circuit, the driving frequency of the switching element of the heater control circuit, and the driving frequency of the switching element of the power supply circuit are set so as not to overlap with each other.
Composite device.
The composite device according to claim 1, wherein the motor drive circuit, the heater control circuit, and the power supply circuit are mounted on one circuit board.
A control circuit that controls the operation of the motor drive circuit and the heater control circuit is further mounted on the circuit board,
The power supply circuit is configured to generate power to be supplied to the control circuit in addition to power to be supplied to the motor drive circuit and the heater control circuit.
The composite device according to claim 2.
The driving frequency of the switching element of the motor drive circuit is one order of magnitude higher than the driving frequency of the switching element of the heater control circuit, and the driving frequency of the switching element of the power supply circuit is higher than the driving frequency of the switching element of the motor drive circuit. The composite device according to any one of claims 1 to 3, which is one order of magnitude or more higher than .
The driving frequency of the switching element of the motor drive circuit is set to a frequency on the order of several tens of kHz, the driving frequency of the switching element of the heater control circuit is set to a frequency of the order of several tens of Hz, and the driving frequency of the switching element of the power supply circuit is set to a frequency on the order of several tens of kHz. 5. The composite device according to claim 4, wherein the frequency is set on the order of several 100 kHz.