KR20230116691A - Motor-driven compressor - Google Patents

Abstract

An electric compressor includes an inverter device having a circuit board and a connector. The inverter device includes an inverter circuit and a filter circuit. The filter circuit has a coil, a first capacitor located between the coil and the connector, and a second capacitor located between the coil and the inverter circuit. The coil, the first capacitor, and the second capacitor are mounted on the circuit board. The circuit board has a conductive pattern electrically connecting the first condenser and the second condenser, the conductive pattern is connected to ground, and the circuit board comprises the first condenser in the conductive pattern. and an insulating portion configured to make an impedance between the capacitor and the second capacitor greater than an impedance between the second capacitor and the ground in the conductive pattern.

Description

Motor-driven compressor {MOTOR-DRIVEN COMPRESSOR}

This disclosure relates to an electric compressor.

An electric compressor includes a compression unit, an electric motor, and an inverter device. The compression unit compresses the fluid. The electric motor drives the compression unit. The inverter device has a circuit board. The circuit board drives an electric motor. In addition, the electric compressor is equipped with a connector. The connector is electrically connected to a power source. In addition, the inverter device includes an inverter circuit. An inverter circuit converts DC power input from a power supply through a connector into AC power.

Moreover, for example, Japanese Unexamined Patent Publication No. 2019-187228 discloses an inverter device provided with a filter circuit. The filter circuit reduces noise while being positioned between the inverter circuit and the connector. Specifically, the filter circuit has a coil, a first condenser, and a second condenser. A 1st capacitor is located between a coil and a connector. The second condenser is positioned between the coil and the inverter circuit. The coil, the first capacitor, and the second capacitor are mounted on a circuit board. The circuit board has a conductive pattern. The conductive pattern electrically connects the first capacitor and the second capacitor. The conductive pattern is connected to ground.

Then, noise generated from the inverter circuit flows to the ground via the coil, the first condenser and the conductive pattern, or flows to the ground via the second condenser and the conductive pattern. Thereby, noise generated from the inverter circuit is suppressed from flowing into the connector. As a result, leakage of noise generated from the inverter circuit to the outside through the connector is suppressed.

Japanese Unexamined Patent Publication No. 2019-187228

In such an electric compressor, there is a possibility that noise flowing from the inverter circuit to the conductive pattern through the second condenser flows toward the connector via the first condenser. If noise generated from the inverter circuit flows into the connector, there is a risk that the noise generated from the inverter circuit leaks out through the connector. Therefore, in such an electric compressor, it is desired to suppress leakage of noise generated from the inverter circuit to the outside through the connector.

An electric compressor according to one aspect of the present disclosure includes an inverter device having a compression unit configured to compress fluid, an electric motor configured to drive the compression unit, and a circuit board configured to drive the electric motor, and electrically connected to a power source. It has a connector to be connected, and the inverter device includes an inverter circuit configured to convert DC power input from the power source through the connector into AC power, and is located between the inverter circuit and the connector and reduces noise. a filter circuit configured to reduce the voltage, the filter circuit having a coil, a first capacitor located between the coil and the connector, and a second capacitor located between the coil and the inverter circuit; , the coil, the first capacitor, and the second capacitor are mounted on the circuit board, the circuit board has a conductive pattern electrically connecting the first capacitor and the second capacitor, and the conductive The pattern is connected to ground, and the circuit board is configured such that an impedance between the first capacitor and the second capacitor in the conductive pattern is defined as an impedance between the second capacitor and the ground in the conductive pattern. has an insulation section configured to be larger than the impedance of

According to this, the insulating part makes the impedance between the first capacitor and the second capacitor in the conductive pattern larger than the impedance between the second capacitor and the ground in the conductive pattern. Therefore, noise flowing from the inverter circuit through the second condenser to the conductive pattern becomes difficult to flow toward the connector via the first condenser. Then, noise flowing from the inverter circuit through the second condenser to the conductive pattern tends to flow to the ground. As a result, leakage of noise generated from the inverter circuit to the outside through the connector can be suppressed.

In the electric compressor, a slit extending from between the first condenser and the second condenser toward the ground is formed in the conductive pattern, and the insulating portion may include the slit.

According to this, the insulating portion can be realized only by forming a slit extending from between the first capacitor and the second capacitor toward the ground in the conductive pattern. Therefore, it is not necessary to add, for example, a new coil or capacitor to the circuit board in order to suppress leakage of noise generated from the inverter circuit to the outside through the connector. As a result, it is possible to avoid the formation of a new noise path on the circuit board by adding a new coil or capacitor to the circuit board.

According to the present disclosure, leakage of noise generated from the inverter circuit to the outside through the connector can be suppressed.

1 is a sectional view of an electric compressor in an embodiment.
2 is a circuit diagram showing the electrical configuration of the electric compressor of FIG. 1;
3 is a plan view of the circuit board.

(Mode for implementing the invention)

Hereinafter, an embodiment embodying an electric compressor will be described with reference to FIGS. 1 to 3 . The electric compressor of this embodiment is used, for example, in a vehicle air conditioner.

(Overall composition of the vehicle (Ve))

As shown in FIG. 1 , vehicle Ve includes power storage device B and vehicle air conditioner 100 . The electrical storage device B is a power source for supplying power to devices mounted in the vehicle Ve. The power storage device B is a DC power supply. The power storage device B is, for example, a secondary battery or a capacitor. A vehicle air conditioner (100) includes an external refrigerant circuit (110), an air conditioning ECU (120), and an electric compressor (10). The external refrigerant circuit 110 supplies refrigerant as a fluid to the electric compressor 10 . The external refrigerant circuit 110 has, for example, a heat exchanger and an expansion valve. The external refrigerant circuit 110 heats and cools the interior of the vehicle Ve by exchanging heat between the outside and the refrigerant. The air conditioning ECU 120 is configured to be capable of grasping the temperature inside the car, the set temperature of the car air conditioner, and the like. Then, the air conditioning ECU 120 transmits various commands such as an ON/OFF command to the electric compressor 10 based on parameters such as the temperature inside the car or the set temperature of the car air conditioner.

(Entire configuration of the motor-compressor 10)

The electric compressor 10 includes a housing 20, a rotating shaft 30, a compression unit 31, an electric motor 32, a connector 36, and an inverter device 40. The housing 20 is made of metal. The housing 20 is made of aluminum, for example. In addition, the material of the housing 20 is arbitrary as long as it is a metal which has heat transfer property. The housing 20 is grounded to a body (not shown) of the vehicle Ve.

The housing 20 has a suction housing member 21, a discharge housing member 22, and a cover member 23. The suction housing member 21 has a plate-shaped end wall 21a, a cylindrical circumferential wall 21b, and a suction port 21c. The circumferential wall 21b rises from the outer periphery of the end wall 21a toward the discharge housing member 22 . The intake port 21c is connected to the external refrigerant circuit 110 . The inlet 21c is formed in the circumferential wall 21b.

The discharge housing member 22 is assembled to the suction housing member 21 so as to close the opening of the suction housing member 21 . Accordingly, the suction housing member 21 and the discharge housing member 22 form a motor accommodating chamber S1 in the housing 20 . The discharge housing member 22 has a discharge port 22a. The outlet 22a is connected to the external refrigerant circuit 110 .

The cover member 23 has a plate-shaped end wall 23a and a cylindrical circumferential wall 23b. The cover member 23 is attached to the end wall 21a of the suction housing member 21 so that the open end of the circumferential wall 23b abuts against the end wall 21a. The opening of the circumferential wall 23b of the cover member 23 is blocked by the end wall 21a. Thus, the end wall 21a and the cover member 23 form the inverter accommodation chamber S2. Therefore, the housing 20 has the inverter storage chamber S2. The end wall 21a blocks the motor accommodating chamber S1 and the inverter accommodating chamber S2.

The rotating shaft 30 is rotatably disposed with respect to the housing 20 . The rotating shaft 30 is rotatably supported by the housing 20 . The rotating shaft 30 is accommodated in the motor accommodation chamber S1 so that the axial direction of the rotating shaft 30 coincides with the axial direction of the circumferential wall 21b.

(Configuration of compression unit 31)

The compression part 31 is housed in the suction housing member 21 . The compression portion 31 is of a scroll type, and includes, for example, a fixed scroll (not shown) fixed within the suction housing member 21 and a movable scroll (not shown) opposed to the fixed scroll. The compression part 31 is disposed in a position closer to the discharge port 22a than to the suction port 21c in the motor accommodation chamber S1. The compression part 31 is connected to the rotating shaft 30 . The compression unit 31 is driven by rotation of the rotary shaft 30 to compress the refrigerant.

(Configuration of electric motor 32)

The electric motor 32 is accommodated in motor accommodation chamber S1. The electric motor 32 is arrange|positioned between the compression part 31 in motor accommodation chamber S1 and the end wall 21a. The electric motor 32 has, for example, a cylindrical rotor 33, a stator 34, and three-phase coils 35u, 35v, and 35w. The rotor 33 is fixed to the rotating shaft 30 . Accordingly, the rotating shaft 30 is disposed so as to be integrally rotatable with the rotor 33 . The stator 34 is fixed to the circumferential wall 21b of the housing 20 . The rotor 33 and the stator 34 face each other in the radial direction of the rotating shaft 30 .

The three-phase coils 35u, 35v, and 35w are wound around the stator 34, respectively. The three-phase coils 35u, 35v, and 35w are Y-connected, for example. In addition, the connection mode of the three-phase coils 35u, 35v, and 35w is not limited to Y connection, but is arbitrary. The connection mode of the three-phase coils 35u, 35v, and 35w may be, for example, a delta connection.

The rotor 33 rotates when the three-phase coils 35u, 35v, and 35w are energized in a predetermined pattern. Then, along with the rotation of the rotor 33, the rotating shaft 30 rotates. Accordingly, the compression unit 31 is driven. Therefore, the electric motor 32 drives the compression part 31 . Then, the refrigerant flowing through the external refrigerant circuit 110 is sucked into the housing 20 through the intake port 21c. The compression unit 31 compresses the refrigerant sucked into the housing 20 . The compressed refrigerant is discharged to the external refrigerant circuit 110 through the discharge port 22a.

(About connector 36)

The connector 36 is a terminal for supplying power from the power storage device B mounted in the vehicle Ve to the inverter device 40 . Connector 36 is electrically connected to power storage device B. The connector 36 is formed on the cover member 23 .

(Overall configuration of inverter device 40)

The inverter device 40 is accommodated in the inverter storage room S2. Therefore, the housing 20 accommodates the inverter device 40 . The inverter device 40 is electrically connected to the power storage device B via a connector 36 .

The inverter device 40 has a circuit board 41 . The circuit board 41 drives the electric motor 32 . The circuit board 41 is housed in the inverter housing chamber S2. The circuit board 41 opposes the end wall 21a in the axial direction of the rotating shaft 30 at a predetermined interval therebetween. The circuit board 41 is housed in the inverter storage chamber S2 so that the thickness direction of the circuit board 41 coincides with the axial direction of the rotating shaft 30 .

As shown in FIG. 2 , the inverter device 40 includes an inverter circuit 42 , a control unit 43 , and a filter circuit 44 .

(About the inverter circuit 42)

The inverter circuit 42 includes a positive bus Lp, a negative bus Ln, six switching elements Q1 to Q6, and six diodes D1 to D6. As the switching elements Q1 to Q6, IGBTs are used. Between the positive bus bar Lp and the negative bus bar Ln, a switching element Q1 constituting the u-phase upper arm and a switching element Q2 constituting the u-phase lower arm are connected in series. has been Between the positive bus bar Lp and the negative bus bar Ln, a switching element Q3 constituting the v-phase arm and a switching element Q4 constituting the v-phase lower arm are connected in series. Between the positive bus bar Lp and the negative bus bar Ln, a switching element Q5 constituting the w-phase arm and a switching element Q6 constituting the w-phase lower arm are connected in series. Diodes D1 to D6 are connected in anti-parallel to the switching elements Q1 to Q6.

Between the switching element Q1 and the switching element Q2 is connected to the u-phase coil 35u of the electric motor 32. Between the switching element Q3 and the switching element Q4 is connected to the v-phase coil 35v of the electric motor 32. Between the switching element Q5 and the switching element Q6, it is connected to the w-phase coil 35w of the electric motor 32. The inverter circuit 42 having the switching elements Q1 to Q6 constituting the upper and lower arms converts the DC voltage into an AC voltage in accordance with the switching operation of the switching elements Q1 to Q6 and outputs it to the electric motor 32. is configured to Thus, the inverter circuit 42 converts the DC power input from the electrical storage device B through the connector 36 into AC power.

(About the control unit 43)

The control unit 43 controls the switching operation of each of the switching elements Q1 to Q6. The controller 43 can be realized by, for example, one or more dedicated hardware circuits and/or one or more processors (control circuits) that operate according to computer programs (software). The processor includes a CPU and memory such as RAM and ROM, and the memory stores, for example, program codes or instructions configured to cause the processor to execute various processes. Memory, ie, computer readable media, includes all available media that can be accessed by a general-purpose or special-purpose computer.

The control unit 43 periodically turns ON/OFF each of the switching elements Q1 to Q6 based on a command from the air conditioning ECU 120 . In detail, the control part 43 performs PWM control of each switching element Q1-Q6 based on the command|command from air conditioning ECU120. The control unit 43 generates a control signal using the carrier signal and the command voltage value signal. Then, the control unit 43 converts DC power into AC power by performing ON/OFF control of each switching element Q1 to Q6 using the generated control signal.

(About the filter circuit 44)

The filter circuit 44 is formed between the connector 36 and the inverter circuit 42 . The filter circuit 44 reduces noise included in DC power input from the connector 36 to the inverter circuit 42 . Further, the filter circuit 44 reduces noise generated from the inverter circuit 42 and flowing toward the connector 36 . In addition, the noise generated from the inverter circuit 42 is noise generated accompanying the switching operation of the respective switching elements Q1 to Q6, for example.

The filter circuit 44 is connected to a positive electrode bus line Lp and a negative electrode bus line Ln. Therefore, the filter circuit 44 is formed on the input side of the inverter circuit 42 . The filter circuit 44 has a smoothing condenser 45, a coil 46, a first condenser 47, and a second condenser 48.

The smoothing capacitor 45 is an X capacitor connected in parallel with the inverter circuit 42 . Specifically, the smoothing capacitor 45 is connected to the positive electrode bus line Lp and the negative electrode bus line Ln.

The coil 46 is, for example, a common mode choke coil. The coil 46 is formed on the input side of the inverter circuit 42 . The coil 46 has a leakage inductance (L). The leakage inductance (L) is used as a choke coil for normal mode noise. Therefore, the leakage inductance (L), together with the smoothing capacitor 45, is a component of a low-pass filter circuit that removes normal mode noise. Accordingly, the coil 46 reduces noise included in DC power. Thus, the filter circuit 44 removes common mode noise and normal mode noise.

The filter circuit 44 has two first capacitors 47 . The two first capacitors 47 are connected in series. The space between the two first capacitors 47 is grounded to the body of the vehicle Ve via the housing 20 . The two first capacitors 47 are connected in parallel to the connector 36 . The two first condensers 47 are connected in parallel with respect to the coil 46 . The two first capacitors 47 are positioned between the connector 36 and the coil 46 .

The filter circuit 44 has two second capacitors 48 . The two second capacitors 48 are connected in series. Between the two second condensers 48, the body of the vehicle Ve is grounded via the housing 20. The two second capacitors 48 are positioned between the coil 46 and the inverter circuit 42 . The two second condensers 48 are connected in parallel with respect to the coil 46 . The two second capacitors 48 are connected in parallel to the smoothing capacitor 45 . The two second capacitors 48 are positioned between the coil 46 and the smoothing capacitor 45 .

(About the detailed configuration of the circuit board 41)

As shown in FIG. 3 , the coil 46 , the first capacitor 47 , and the second capacitor 48 are mounted on a circuit board 41 . In addition, in FIG. 3, only one each of the 1st capacitor|condenser 47 and the 2nd capacitor|condenser 48 is shown for convenience of description. In addition, although the smoothing capacitor 45 is also mounted on the circuit board 41, in FIG. 3, illustration of the smoothing capacitor 45 is abbreviate|omitted for explanatory convenience.

The circuit board 41 has a first conductive pattern 51 , a second conductive pattern 52 , and a third conductive pattern 53 . In addition, the circuit board 41 has an insulating layer 54 . The insulating layer 54 is formed of, for example, plate-shaped glass epoxy resin. The first conductive pattern 51, the second conductive pattern 52, and the third conductive pattern 53 are formed of sheet-like copper foil. The first conductive pattern 51, the second conductive pattern 52, and the third conductive pattern 53 are patterned into predetermined shapes. The first conductive pattern 51 , the second conductive pattern 52 , and the third conductive pattern 53 are formed on the surface of the insulating layer 54 . The first conductive pattern 51, the second conductive pattern 52, and the third conductive pattern 53 are formed on the surface of the insulating layer 54 so as to be spaced apart from each other to the extent that insulation can be ensured. .

The first conductive pattern 51 is electrically connected to the inverter circuit 42 . The first conductive pattern 51 has a first edge 51a facing the second conductive pattern 52 . In addition, the first conductive pattern 51 has a second edge 51b facing the third conductive pattern 53 . The second conductive pattern 52 is electrically connected to the connector 36 . The second conductive pattern 52 has a third edge 52a opposite to the first edge 51a of the first conductive pattern 51 . In addition, the second conductive pattern 52 has a fourth edge 52b facing the third conductive pattern 53 . The third conductive pattern 53 has a fifth edge 53a opposite to the second edge 51b of the first conductive pattern 51 and the fourth edge 52b of the second conductive pattern 52. .

A first end of the coil 46 is connected to the first conductive pattern 51 . A second end of the coil 46 is connected to the second conductive pattern 52 . Therefore, the coil 46 electrically connects the first conductive pattern 51 and the second conductive pattern 52 . The coil 46 crosses between the first edge 51a of the first conductive pattern 51 and the third edge 52a of the second conductive pattern 52, so that the first conductive pattern 51 and The second conductive pattern 52 is electrically connected.

The third conductive pattern 53 is a conductive pattern electrically connecting the first capacitor 47 and the second capacitor 48 . A first end of the first capacitor 47 is connected to the second conductive pattern 52 . The second end of the first capacitor 47 is connected to the third conductive pattern 53 . Accordingly, the first capacitor 47 electrically connects the second conductive pattern 52 and the third conductive pattern 53 . The first capacitor 47 crosses between the fourth edge 52b of the second conductive pattern 52 and the fifth edge 53a of the third conductive pattern 53, so that the second conductive pattern 52 ) and the third conductive pattern 53 are electrically connected.

A first end of the second capacitor 48 is connected to the first conductive pattern 51 . A second end of the second capacitor 48 is connected to the third conductive pattern 53 . Therefore, the second capacitor 48 electrically connects the first conductive pattern 51 and the third conductive pattern 53 . The second capacitor 48 crosses between the second edge 51b of the first conductive pattern 51 and the fifth edge 53a of the third conductive pattern 53, so that the first conductive pattern 51 ) and the third conductive pattern 53 are electrically connected.

A bolt 55 penetrates the third conductive pattern 53 . The bolt 55 fixes the circuit board 41 to the housing 20 by being screwed into the housing 20 . The bolt 55 is electrically connected to the housing 20 . Therefore, the bolt 55 is used as a ground. The third conductive pattern 53 is electrically connected to the bolt 55 . Therefore, the third conductive pattern 53 is connected to ground. And, the third conductive pattern 53 is grounded to the body of the vehicle Ve via the bolt 55 and the housing 20 .

(About the slit 56)

A slit 56 is formed in the third conductive pattern 53 . The slit 56 extends toward the bolt 55 from a portion located between the first capacitor 47 and the second capacitor 48 at the fifth edge 53a of the third conductive pattern 53. has been Specifically, the slit 56 has a first slit portion 56a and a second slit portion 56b. The first slit portion 56a is formed from a portion located between the first condenser 47 and the second condenser 48 in the fifth end 53a of the third conductive pattern 53 to the fifth end ( 53a) extends in a direction orthogonal to it. The second slit portion 56b extends from an end portion of the first slit portion 56a on the opposite side to the fifth end edge 53a toward the bolt 55 along the fifth end edge 53a. Therefore, the slit 56 extends from between the first condenser 47 and the second condenser 48 toward the ground.

(About the current path of the third conductive pattern 53)

The sectional area of the current path between the first condenser 47 and the second condenser 48 in the third conductive pattern 53 is obtained when the slit 56 is not formed in the third conductive pattern 53. is small compared to In addition, the current path between the first capacitor 47 and the second capacitor 48 in the third conductive pattern 53 is when the slit 56 is not formed in the third conductive pattern 53. is longer than that of Therefore, the impedance between the first condenser 47 and the second condenser 48 in the third conductive pattern 53 is the case where the slit 56 is not formed in the third conductive pattern 53. It is large in comparison.

Further, the slit 56 forms a current path between the first capacitor 47 and the second capacitor 48 in the third conductive pattern 53, and the second capacitor 47 in the third conductive pattern 53. It is made longer than the current path between the capacitor 48 and the bolt 55. Further, on the current path between the first capacitor 47 and the second capacitor 48 in the third conductive pattern 53, a bolt 55 exists.

(About the insulation part 57)

In the space inside the slit 56, noise flowing from the inverter circuit 42 through the second capacitor 48 to the third conductive pattern 53 passes through the first capacitor 47 without passing through the bolt 55. It is used as an insulator 57 to suppress flow to. Therefore, the insulating portion 57 reduces the impedance between the first capacitor 47 and the second capacitor 48 in the third conductive pattern 53 to the second capacitor 47 in the third conductive pattern 53. It is made larger than the impedance between the capacitor 48 and the bolt 55. Thus, the insulator 57 includes the slit 56 . In this way, the circuit board 41 has an insulating portion 57 .

(Action)

Next, the operation of this embodiment will be described.

Noise generated from the inverter circuit 42 passes through the coil 46, the first condenser 47, and the third conductive pattern 53 to the ground, as indicated by arrow A1 in FIG. 3, for example. flows to Noise generated from the inverter circuit 42 flows to the ground via the second condenser 48 and the third conductive pattern 53, as indicated by arrow A2 in FIG. 3, for example. As a result, noise generated from the inverter circuit 42 is suppressed from flowing into the connector 36 . As a result, leakage of noise generated from the inverter circuit 42 to the outside via the connector 36 is suppressed.

The insulator 57 controls the impedance between the first condenser 47 and the second condenser 48 in the third conductive pattern 53 to be the second condenser in the third conductive pattern 53 ( 48) and the bolt 55. Therefore, noise flowing from the inverter circuit 42 through the second condenser 48 to the third conductive pattern 53 becomes difficult to flow toward the connector 36 via the first condenser 47. Then, noise flowing from the inverter circuit 42 through the second condenser 48 to the third conductive pattern 53 tends to flow to the ground. As a result, leakage of noise generated from the inverter circuit 42 to the outside via the connector 36 is suppressed.

(effect)

In the above embodiment, the following effects can be obtained.

(1) In the circuit board 41, the impedance between the first condenser 47 and the second condenser 48 in the third conductive pattern 53 is 2 It has an insulation part 57 that makes it larger than the impedance between the condenser 48 and the ground. According to this, noise flowing from the inverter circuit 42 through the second condenser 48 to the third conductive pattern 53 becomes difficult to flow toward the connector 36 via the first condenser 47. Then, noise flowing from the inverter circuit 42 through the second condenser 48 to the third conductive pattern 53 tends to flow to the ground. As a result, leakage of noise generated from the inverter circuit 42 to the outside through the connector 36 can be suppressed.

(2) In the third conductive pattern 53, a slit 56 extending from between the first capacitor 47 and the second capacitor 48 toward the ground is formed. The insulating portion 57 includes a slit 56 . According to this, the insulating portion 57 can be realized only by forming the slit 56 extending from between the first capacitor 47 and the second capacitor 48 toward the ground in the third conductive pattern 53. there is. Therefore, in order to suppress leakage of noise generated from the inverter circuit 42 to the outside through the connector 36, for example, it is necessary to add members such as new coils and capacitors to the circuit board 41. does not exist. As a result, by adding the member to the circuit board 41, it is possible to avoid the formation of a new noise path on the circuit board 41.

(3) In order to suppress leakage of noise generated from the inverter circuit 42 to the outside through the connector 36, for example, it is necessary to add members such as new coils and capacitors to the circuit board 41. there is no Therefore, the size increase of the electric compressor 10 by adding a member to the circuit board 41 can be avoided. Moreover, since there is no need to change the arrangement space or layout of the circuit board 41 for the inverter storage room S2, the degree of freedom of the layout of the inverter storage room S2 can be improved.

(example of change)

In addition, the said embodiment can be implemented with a change as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a range that is not technically contradictory.

In the embodiment, MOSFETs may be used instead of IGBTs as the switching elements Q1 to Q6. In this case, the diodes D1 to D6 become unnecessary.

In the embodiment, instead of the slit 56, the insulating portion 57 may be formed by forming a through hole penetrating the circuit board 41, for example.

○ In the embodiment, the number of first capacitors 47 is not particularly limited.

○ In the embodiment, the number of second capacitors 48 is not particularly limited.

○ In the embodiment, the coil 46 is not limited to a common mode choke coil.

○ In the embodiment, the compression unit 31 is not limited to a scroll type, but may be of another type such as a piston type or a vane type, for example.

○ In the embodiment, the electric compressor 10 is used for the vehicle air conditioner 100, but is not limited thereto. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and compress air as a fluid supplied to the fuel cell by means of the compression unit 31 .

B: power storage device as power source
10: electric compressor
31: compression unit
32: electric motor
36: connector
40: inverter device
41: circuit board
42: inverter circuit
44: filter circuit
46: Coil
47: first condenser
48: second condenser
53: third conductive pattern as a conductive pattern
56: slit
57: insulation

Claims (2)

a compression unit configured to compress a fluid;
An electric motor configured to drive the compression unit;
an inverter device having a circuit board configured to drive the electric motor;
a connector electrically connected to a power source;
The inverter device,
an inverter circuit configured to convert DC power input from the power source through the connector into AC power;
a filter circuit positioned between the inverter circuit and the connector and configured to reduce noise;
The filter circuit,
coil,
A first capacitor positioned between the coil and the connector;
a second condenser positioned between the coil and the inverter circuit;
The coil, the first capacitor, and the second capacitor are mounted on the circuit board,
The circuit board has a conductive pattern electrically connecting the first capacitor and the second capacitor,
The conductive pattern is connected to ground,
In the circuit board, an insulation portion configured such that an impedance between the first capacitor and the second capacitor in the conductive pattern is greater than an impedance between the second capacitor and the ground in the conductive pattern. You have, an electric compressor. According to claim 1,
A slit extending from between the first capacitor and the second capacitor toward the ground is formed in the conductive pattern;
The motor-compressor, wherein the insulating portion includes the slit.