WO2020022706A1

WO2020022706A1 - Power conversion device and vehicle having same

Info

Publication number: WO2020022706A1
Application number: PCT/KR2019/008957
Authority: WO
Inventors: 김근회; 신동일; 이상봉
Original assignee: 엘지전자 주식회사
Priority date: 2018-07-19
Filing date: 2019-07-19
Publication date: 2020-01-30

Abstract

The present invention relates to a power conversion device and a vehicle having same. The power conversion device, according to one embodiment of the present invention, comprises: a direct-current power supply unit for outputting direct-current power; and a filter unit connected to a dc terminal which is an output terminal of the direct-current power supply unit. The filter unit may comprise: a first capacitor element of which one end is connected to one end of the dc terminal; a second capacitor element of which one end is connected to the other end of the dc terminal, and the other end is connected to the other end of the first capacitor element; first and second switching elements which are connected in series with each other and carry out a switching operation on the basis of a current flowing through at least one of the first and second capacitor elements; a third capacitor element connected between a gate terminal or a base terminal of the first switching element, and the other ends of the first and second capacitor elements; a fourth capacitor element connected between a gate terminal or a base terminal of the second switching element, and the other ends of the first and second capacitor elements; a fifth capacitor element connected between the first switching element and the one end of the dc terminal; and a sixth capacitor element connected between the second switching element and the other end of the dc terminal. Accordingly, common mode EMI noise, generated by the switching operation of the switching elements and flowing in the dc terminal along with a direct-current current, may be effectively reduced. In addition, various embodiments are possible.

Description

Power conversion device and vehicle having same

The present invention relates to a power converter and a vehicle having the same, and more particularly, to a power converter including a filter unit connected to a dc terminal supplied with a DC power source to reduce EMI noise, and a vehicle having the same. .

Vehicles brought about by the invention of internal combustion engines are indispensable for human life, but they cause energy depletion due to the main causes of environmental pollution and the consumption of enormous energy. There is a tendency for electric vehicles to be used as power and hybrid vehicles in combination with internal combustion engines to be developed and used.

On the other hand, such an electric vehicle or a hybrid vehicle generates the output using a motor, a battery, or the like,

On the other hand, such an electric vehicle or a hybrid vehicle is generally provided with a power conversion device for converting and outputting power, the power conversion device, for example, a DC-DC converter for stepping down or stepping up a DC power supply, DC power supply It may include an inverter for converting into an AC power source.

On the other hand, when the power converter operates to convert power, electromagnetic interference (EMI) noise may occur, for example, when the switching element provided in the inverter is turned on / off. Here, EMI noise refers to electromagnetic noise in the form of electromagnetic waves generated by an electronic device.

EMI noise affects normal control signals, communication signals, and the like, and may cause problems such as malfunction of a device and communication failure, and various methods for reducing such EMI noise have been proposed.

Conventionally, as in the prior art 1 (Korean Patent Publication No. 10-2018-0115788), using a passive filter such as a common-mode choke having a core, a coil, or the like, Although EMI noise is reduced, in order to satisfy the noise reduction standard by using a general passive filter such as a common mode choke, the volume of the passive filter is large, and manufacturing cost increases.

In addition, it is difficult to place a passive filter such as a common mode choke at an input terminal of an inverter that converts AC power into a DC power and outputs it to a motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power conversion device capable of actively reducing an EMI noise signal flowing in a dc terminal together with a direct current and a vehicle having the same.

In order to achieve the above object, a power conversion device according to an embodiment of the present invention, a plurality of capacitor elements connected to a dc terminal to which a direct current power is output, and detects an EMI noise signal flowing through the dc terminal together with a direct current; A plurality of switching elements may be provided to perform a switching operation so that the EMI noise signal flows to the ground terminal.

In order to achieve the above object, a power conversion device according to an embodiment of the present invention includes a DC power supply for outputting a DC power supply, a filter unit connected to the dc end which is an output terminal of the DC power supply unit, the filter unit A first capacitor element, one end of which is connected to one end, a second capacitor element of which one end is connected to the other end of the dc terminal, and the other end of which is connected to the other end of the first capacitor element, and flows through at least one of the first and second capacitor elements A third capacitor connected between the first and second switching elements connected in series with each other, the gate terminal or base terminal of the first switching element, and the other end of the first and second capacitor elements, which perform a switching operation based on a current; A fourth capacitor element connected between the element terminal, the gate terminal or the base terminal of the second switching element, and the other end of the first and second capacitor elements, one end of the dc terminal and the first switch It may include a sixth capacitor element connected between the fifth capacitor element, and the other terminal of the second switching element connected between the dc terminal devices referred to.

In order to achieve the above object, a vehicle according to an embodiment of the present invention includes a DC power supply for outputting a DC power supply, a filter portion connected to the dc end, which is an output terminal of the DC power supply, and the filter unit is connected to one end of the DC end. The first capacitor device, one end of which is connected, the other end of which is connected to the other end of the dc terminal, and the other end connected to the other end of the first capacitor element, the current flowing through at least one of the first and second capacitor elements A third capacitor element connected between the first and second switching elements connected in series with each other, the gate terminal or the base terminal of the first switching element, and the other end of the first and second capacitor elements performing a switching operation based on the first and second switching elements; A fourth capacitor element connected between the gate terminal or the base terminal of the second switching element and the other end of the first and second capacitor elements, one end of the dc end and the first switching element In that connection the fifth capacitor element, and the other terminal of the dc terminal may comprise a power conversion device including a sixth capacitor element connected between the second switching device.

According to various embodiments of the present disclosure, EMI noise in a common mode generated by the switching operation of the switching element and flowing in the dc terminal together with the DC current may be effectively reduced.

In addition, according to various embodiments of the present disclosure, when the passive filter is used together, a passive filter having a smaller volume and a lower price than the conventional filter may be used.

1 is a schematic view showing a vehicle body of a vehicle according to an embodiment of the present invention.

2A is an example of an internal block diagram of a power converter according to an embodiment of the present invention, and FIG. 2B is an example of an internal circuit diagram of a power converter according to an embodiment of the present invention.

3A is an example of an internal block diagram of a power converter according to another embodiment of the present invention, and FIG. 3B is an example of an internal circuit diagram of the power converter according to another embodiment of the present invention.

4A is an example of an internal circuit diagram of a power converter including an auxiliary filter unit according to an embodiment of the present invention, and FIG. 4B is a diagram of a power converter including an auxiliary filter unit according to another embodiment of the present invention. An example of an internal circuit diagram.

Hereinafter, with reference to the drawings will be described in detail the present invention. In the drawings, parts not related to the description are omitted in order to clearly and briefly describe the present invention, and the same reference numerals are used for the same or extremely similar parts throughout the specification.

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude, in advance, the existence or the possibility of adding numbers, steps, operations, components, parts, or combinations thereof.

Further, in this specification, terms such as first and second may be used to describe various elements, but such elements are not limited by these terms. These terms are only used to distinguish one element from another.

Referring to FIG. 1, the vehicle 100 according to an embodiment of the present invention may include, for example, a battery 205 for supplying power, a motor driving device 200 for receiving power from the battery 205, and a motor. Motor 250 that is driven and rotated by the driving device 200, front wheel 150 and rear wheel 155 rotated by the motor 250, front wheel suspension 160 to block the vibration of the road surface to the vehicle body And / or rear wheel suspension device 165, the inclination angle detector 190 for detecting the inclination angle of the vehicle body. On the other hand, a drive gear (not shown) for converting the rotational speed of the motor 250 based on the gear ratio may be additionally provided.

In the drawing, an electric vehicle driven by the motor 250 by the power supplied from the battery 205 will be described as an example of the vehicle 100, but the present invention is not limited thereto, and the switching operation of the switching element is performed. All vehicles including a power converter for converting power may be applicable.

The inclination angle detector 190 detects, for example, the inclination angle of the vehicle body, and the detected inclination angle is input to the controller 170 to be described later. The inclination angle detector 190 may be implemented as, for example, a gyro sensor or a horizontal gauge sensor.

Meanwhile, in the drawing, the inclination angle detector 190 is illustrated as being disposed on the battery 205, but is not limited thereto. The front wheel 150, the rear wheel 155, or the front wheel 150 and the rear wheel 155 may be disposed. have.

The battery 205 may supply power to the motor driving device 200, for example. In particular, the battery 205 can supply DC power to the capacitor C of the motor driving device 200.

The battery 205 may be formed of, for example, a plurality of unit cells. For example, the plurality of unit cells may be managed by a battery management system (BMS) to maintain a constant voltage, and may emit a constant voltage by the battery management system.

For example, the battery management system may detect the voltage Vbat of the battery 205 and transmit the voltage Vbat to the electronic controller (not shown) or the inverter controller 250 in the motor driving apparatus 200, and the battery voltage. When Vbat falls below the lower limit, the DC power stored in the capacitor C in the motor driving apparatus 200 may be supplied to the battery. In addition, when the battery voltage Vbat rises above the upper limit, the DC power may be supplied to the capacitor C in the motor driving device 200.

The battery 205 is, for example, preferably configured as a secondary battery capable of charging and discharging, but is not limited thereto.

The motor drive device 200 is supplied with a direct current power supply by the power input cable 120 from the battery 205, for example. The motor driving device 200 may, for example, convert DC power received from the battery 205 into AC power and supply the same to the motor 250. At this time, the AC power to be converted is preferably a three-phase AC power supply. The motor driving device 200 may supply three-phase AC power to the motor 250 through, for example, a three-phase output cable 125 provided in the motor driving device 200.

On the other hand, since the motor driving device 200 may convert the DC power into AC power to supply the motor 250, the motor driving device 200 may also be included in the power conversion device according to various embodiments of the present disclosure.

Although the motor driving device 200 of FIG. 1 shows a three-phase output cable 125 consisting of three cables, three cables may be provided in a single cable.

The motor 250 may include, for example, a stator 130 that is fixed without rotating and a rotating rotor 135. The motor 250 may include, for example, an input cable 140, and may receive an AC power supplied from the motor driving device 200 through the input cable 140. The motor 250 may be, for example, a three-phase motor, and the rotation speed of the rotor is variable based on the applied frequency when a voltage variable / frequency variable each phase AC power is applied to the coil of each stator. Can be.

The motor 250 may be in various forms, such as an induction motor, a brushless DC motor, a reluctance motor, and the like.

On the other hand, one side of the motor 250 may be provided with a drive gear (not shown). The drive gear can convert the rotational energy of the motor 250 based on the gear ratio, for example. For example, the rotational energy output from the drive gear is transmitted to the front wheel 150 and / or the rear wheel 155, the electric vehicle 100 can move.

The front wheel suspension device 160 and the rear wheel suspension device 165 may support the front wheel 150 and the rear wheel 155 with respect to the vehicle body, for example. The up-down direction of the front wheel suspension device 160 and the rear wheel suspension device 165 is supported by a spring or a damping mechanism, so that the vibration of the road surface may not touch the vehicle body.

The front wheel 150 may be further provided with, for example, a steering device (not shown). The steering device may mean, for example, a device for adjusting the direction of the front wheel 150 to drive the electric vehicle 100 in a direction intended by the driver.

On the other hand, although not shown in the drawings, the electric vehicle 100 may further include an electronic controller for controlling electronic devices in the overall electric vehicle. The electronic controller (not shown) controls each device to perform an operation, display, and the like. In addition, the above-described battery management system may be controlled.

In addition, the electronic control unit (not shown) includes, for example, an inclination angle detector (not shown) for detecting the inclination angle of the electric vehicle 100, a speed detector (not shown) for detecting the speed of the electric vehicle 100, and a brake pedal. On the basis of the detection signals from the brake detection unit (not shown) according to the operation, the axel detection unit (not shown) according to the operation of the accelerator pedal, and the like, various driving modes (driving mode, reverse mode, neutral mode, parking mode, etc.) According to the operation command value can be generated. The operation command value at this time may be, for example, a torque command value or a speed command value.

Meanwhile, the electric vehicle 100 according to the embodiment of the present invention may be a concept including a pure electric vehicle using a battery and a motor, as well as a hybrid electric vehicle using a battery and a motor while using an engine. In this case, the hybrid electric vehicle may further include a switching means capable of selecting at least one of a battery and an engine, and a transmission. On the other hand, the hybrid electric vehicle can be divided into a series method of driving the motor by converting the mechanical energy output from the engine into electrical energy, and a parallel method using the mechanical energy output from the engine and the electrical energy from the battery at the same time.

Referring to FIG. 2A, the power converter 300 may include, for example, a DC power supply unit 310, a filter unit 320, and / or a switching unit 330.

The DC power supply unit 310 may output DC power, for example. The DC power supply 310 may include, for example, a battery 205 for storing DC power.

The DC power supply unit 310 may include, for example, a dc terminal capacitor (not shown). For example, the dc terminal capacitor may be connected to a battery (eg, the battery 205 of FIG. 1) and may store a DC power supplied from the battery 205.

The switching unit 330 may include, for example, at least one switching element (not shown), and converts and outputs the DC power supplied from the DC power supply unit 310 by the switching operation of the switching element. Can be.

The switching unit 330 may include, for example, an inverter (not shown) and / or a DC-DC converter (not shown).

The inverter may include, for example, a plurality of switching elements, and converts a DC power source into a three-phase AC power source having a predetermined frequency by a switching operation of the plurality of switching elements, thereby providing a motor (for example, the motor 250 of FIG. Can be printed on)).

For example, when the upper arm switching element and the lower arm switching element are connected to each other in a pair, the inverter may include a total of three pairs of upper and lower arm switching elements connected in parallel to each other. In this case, for example, diode elements may be connected in anti-parallel to each switching element included in the inverter.

The DC-DC converter may include, for example, at least one switching element, and may output a voltage by stepping up or down a DC power supply by a switching operation.

The DC-DC converter may include, for example, a transformer, an inductor element, a diode element, a capacitor element, and the like to boost or step down the DC power supply.

For example, the filter unit 320 may be connected to a dc terminal (a-b terminal), which is an output terminal of the DC power supply unit 310, and may filter a noise signal of the dc terminal.

When at least one switching element included in the switching unit 330 performs a switching operation, EMI noise may occur, and the generated EMI noise may flow together with a DC current in the dc terminal.

At this time, the filter unit 320 can reduce the EMI noise by allowing the noise current flowing through the dc terminal to flow to the ground terminal.

Referring to FIG. 2B, the DC power supply 310 may include, for example, a battery 205 and a dc terminal capacitor C0.

The filter unit 320 may include, for example, a first capacitor element C1 connected to one end (a node) of the dc terminal and / or a second capacitor element C2 connected to the other end (b node) of the dc terminal. It may include.

For example, when the filter unit 320 includes both the first capacitor element C1 and the second capacitor element C2, one end of the first capacitor element C1 and the second capacitor element C2 may be formed. Respectively, one end (a node) and the other end (b node) of the dc terminal may be connected, and the other ends of the first capacitor element C1 and the second capacitor element C2 may be connected to each other.

The filter unit 320 may detect a current flowing in the dc terminal using, for example, the first capacitor element C1 and / or the second capacitor element C2. For example, among the components included in the current flowing in the dc terminal, the noise current, which is a high frequency component, may be induced to flow through the first capacitor element C1 and / or the second capacitor element C2.

The filter unit 320, for example, performs first and second switching operations based on a current detected through the first capacitor element C1 and / or the second capacitor element C2. Switching elements S1 and S2 may be included.

The first and second switching elements S1 and S2 may be, for example, transistors. The first and second switching elements S1 and S2 may be, for example, bipolar junction transistors (BJTs) or field effective transistors (FETs).

The first and second switching elements S1 and S2 may be, for example, push-pull switching elements or push-pull amplifiers. In the drawing, the first and second switching elements S1 and S2 are illustrated as being bipolar junction transistors BJT.

For example, the first switching element S1 may be a positive-positive-negative (npn) type bipolar junction transistor (BJT), and the second switching element S2 may be a pnp (positive-negative-positive) type. Bipolar junction transistor (BJT).

On the other hand, the filter unit 320 is, for example, between the first node (n1) and the other end of the first capacitor element (C1) and the second capacitor element (C2) connected to each other, and the first switching element (S1) The third capacitor device C3 may be connected to the third capacitor device C3.

The filter unit 320 is connected between, for example, a first node n1 having the other ends of the first capacitor element C1 and the second capacitor element C2 connected to each other, and the second switching element S2. The fourth capacitor device C4 may be formed.

In this case, the turn-on timing of the first and second switching elements S1 and S2 may be determined by the capacitances of the third and fourth capacitor elements C3 and C4.

For example, when the first and second switching elements S1 and S2 are bipolar junction transistors, the third and fourth capacitor elements C3 and C4 are respectively formed of the first and second switching elements S1 and S2. It may be connected to the second and third nodes n2 and n3 which are base ends. Meanwhile, when the first and second switching elements S1 and S2 are field effect transistors FETs, the third and fourth capacitors C3 and C4 are respectively the first and second switching elements S1 and S2. It can be understood that it is connected to the gate terminal of.

Meanwhile, the filter unit 320 may include, for example, a first resistor element R1 connected between the second and third nodes n2 and n3. As such, by disposing the first resistance element R1, not the diode element, between the second and third nodes n2 and n3, efficiency when noise reduction may be increased.

Meanwhile, the filter unit 320 may further include, for example, second and third resistance elements R2 and R3 connected in series between the first switching element S1 and the second switching element S2. In this way, the operational stability of the circuit elements of the filter unit 320 may be improved.

On the other hand, the filter unit 320 may include, for example, a fifth capacitor element C5 connected between one end of the dc terminal (a node) and the first switching element S1 and the other end of the dc terminal (b node). And a sixth capacitor element C6 connected between the second switching element S2.

Through this, the noise current which is a high frequency component among components included in the current flowing in the dc terminal may be induced to flow through the fifth capacitor element C5 and / or the sixth capacitor element C6, and the fifth capacitor By the capacitance of the element C5 and the sixth capacitor element C6, EMI noise can be reduced.

Meanwhile, the filter unit 320 is connected in series with each other, for example, connected between the fourth node n4, which is a node where the second and third resistance elements R2 and R3 are connected to each other, and the ground terminal GND. The device may further include a fourth resistance element R4 and a seventh capacitor element C7. For example, when the first switching element S1 is turned on, the noise current may flow to the ground terminal GND through the fourth resistor element R4 and the seventh capacitor element C7.

On the other hand, the filter unit 320 is, for example, between the fifth node (n5) and the second node (n2) that is a node to which the fifth capacitor (C5) and the first switching element (S1) is connected, and the sixth, A bias resistor element Rbias may be disposed between the sixth node n6 and the third node n3, which are nodes connected to the capacitor C6 and the second switching element S2, respectively.

In other words, the turn-on timings of the first and second switching elements S1 and S2 may include the first and second capacitor elements C1 and C2, the first resistor element R1, and the third and fourth capacitor elements. It may be determined based on the impedance values of C3 and C4 and the bias resistance element Rbias.

On the other hand, the filter unit 320, for example, may be applied to the reference voltage (Vcc) between the fifth and sixth node, and the capacitor element (related to the reference voltage (Vcc) between the fifth and sixth node ( Ccc) may be further arranged.

The filter unit 320 may be named, for example, an active filter.

3A is an example of an internal block diagram of a power converter according to another embodiment of the present invention, and FIG. 3B is an example of an internal circuit diagram of the power converter according to another embodiment of the present invention. Detailed descriptions of contents overlapping with those described in FIGS. 2A and 2B will be omitted.

Referring to FIG. 3A, the power conversion apparatus 200 may include, for example, a DC power supply unit 310, a filter unit 320, and / or a battery 205.

The DC power supply unit 310 may output DC power, for example.

The DC power supply unit 310 may convert, for example, AC power input from an external AC power source (not shown) into DC power and output the DC power. In this case, the DC power supply unit 310 may include, for example, an AC-DC converter (not shown) for converting single-phase AC power or three-phase AC power into DC power.

The AC-DC converter, for example, is composed of a diode or the like without a switching element, and may perform rectification without a separate switching operation. For example, when the external AC power source is a single-phase AC power source, four diodes may be provided in a bridge form. When the external AC power source is a three-phase AC power source, six diodes may be provided in a bridge form.

The AC-DC converter may be, for example, a half-bridge converter in which two switching elements and four diodes are connected. In the AC-DC converter, for example, when the external AC power supply is a three-phase AC power supply, six switching elements and six diodes may be used. The AC-DC converter in this case may be referred to as a rectifier.

The DC power supply unit 310 may output DC power based on, for example, DC power input from an external DC power supply (not shown).

On the other hand, the DC power supply unit 310 may boost or step down the DC power input from an external DC power supply (not shown), for example. In this case, the DC power supply unit 310 may include, for example, at least one switching element, and may include a DC-DC converter (not shown) for boosting or stepping down the DC power by a switching operation. Can be.

Meanwhile, the DC power supply unit 310 may convert, for example, AC power input from an external AC power source (not shown) into DC power, and output the voltage by stepping up or down through a DC-DC converter.

When the switching element provided in the DC power supply 310 performs a switching operation, EMI noise may occur, and the generated EMI noise may flow together with a DC current in the dc terminal.

The battery 205 may store, for example, DC power supplied through the filter unit 320.

Referring to FIG. 3B, the DC power supply 310 may boost or step down the DC power supplied from the external DC power 405 and output the same, for example, at least one switching element (not shown). It may include a DC-DC converter 305 having a.

The filter unit 320 may be connected to, for example, a dc terminal which is an output terminal of the DC-DC converter 310.

The filter unit 320 may include, for example, a first capacitor element C1 connected to one end (a node) of the dc terminal and / or a second capacitor element C2 connected to the other end (b node) of the dc terminal. It is possible to detect the current flowing through the dc stage through, and by filtering the switching operation of the first and second switching elements (S1, S2), it is possible to filter the noise signal flowing through the dc terminal (ab stage) with the direct current. .

4A is an example of an internal circuit diagram of a power converter including an auxiliary filter unit according to an embodiment of the present invention, and FIG. 4B is a diagram of a power converter including an auxiliary filter unit according to another embodiment of the present invention. An example of an internal circuit diagram. Detailed descriptions of contents overlapping with those described in FIGS. 2B and 3B will be omitted.

4A and 4B, the power converter 300 may further include, for example, an auxiliary filter unit 315 connected to a dc terminal.

The auxiliary filter unit 315 may include, for example, an inductor element Lcm, a resistor element Rcm, and a capacitor element Ccm connected in parallel with each other, and the inductor element Lcm and a resistor element connected in parallel. Rcm) and the capacitor element Ccm may be connected to one end (a node) and the other end (b node) of the dc terminal, respectively.

The auxiliary filter unit 315 may reduce, for example, a noise signal having a different frequency band from that of the noise signal reduced by the filter unit 320.

On the other hand, when a resonance phenomenon occurs between the inductor element Lcm provided in the auxiliary filter unit 315 and the first and / or second capacitor elements C1 and C2 provided in the filter unit 320, the filter unit Oscillation may occur while operating stability of devices included in the 320 is inferior.

The filter unit 320 may include, for example, a first node n1 having the other ends of the first capacitor element C1 and the second capacitor element C2 connected to each other, and the second and third resistor elements R2, The fifth resistor device R5 and the eighth capacitor device C8 connected to each other in series may be further included between the fourth node n4, which is a node connected to each other.

In addition, the filter unit 320 may be connected between, for example, a first node n1 and a seventh node n7, which is a node in which the third and fourth capacitors C3 and C4 are connected to each other. It may further include a resistance element.

As a result, the inputs to the first and second switching elements S1 and S2 are reduced at the resonant frequency, and thus the filter unit 320 does not perform the operation at the resonant frequency. A resonance phenomenon between the inductor element Lcm and the first and / or second capacitor elements C1 and C2 included in the filter unit 320 may be prevented.

The filter unit 320 may further include, for example, a first inductor element L1 connected in parallel to the fifth resistor element R5 and connected in series to the eighth capacitor element C8. .

In addition, the filter unit 320 may further include, for example, a ninth capacitor element C9 connected in parallel to the sixth resistor element.

As a result, the influence of the sixth resistor element R6 and the eighth capacitor element C8 may be reduced in a frequency band other than the resonance frequency, so that the filter unit 320 may perform normal operation in a frequency band other than the resonance frequency. Can be.

As described above, according to various embodiments of the present disclosure, a common mode generated by a switching operation of a switching element for power conversion included in the power conversion device 300 and flowing in a dc terminal together with a DC current EMI noise can be effectively reduced.

In addition, when a passive filter such as the auxiliary filter unit 315 is used together with an active filter, a passive filter having a smaller volume and lower cost than a conventional filter may be used.

The accompanying drawings are only for easily understanding the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications and equivalents included in the spirit and scope of the present invention are provided. It should be understood to include water or substitutes.

In addition, while the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims

DC power supply for outputting DC power;

A filter unit connected to a dc terminal which is an output terminal of the DC power supply unit,

The filter unit,

A first capacitor device having one end connected to one end of the dc terminal;

A second capacitor element having one end connected to the other end of the dc terminal and the other end connected to the other end of the first capacitor element;

First and second switching elements connected in series with each other to perform a switching operation based on a current flowing through at least one of the first and second capacitor elements;

A third capacitor element connected between the gate terminal or the base terminal of the first switching element and the other ends of the first and second capacitor elements;

A fourth capacitor element connected between the gate terminal or the base terminal of the second switching element and the other ends of the first and second capacitor elements;

A fifth capacitor device connected between one end of the dc terminal and the first switching device; And

And a sixth capacitor device connected between the other end of the dc terminal and the second switching device.
The method of claim 1,

And a switching unit having at least one switching element and connected to the dc terminal to convert the DC power and output the converted DC power.
The method of claim 2,

The switching unit,

And at least one of an inverter for converting the DC power into an AC power and supplying the motor to a motor, and a DC-DC converter for boosting or stepping down the DC power.
The method of claim 1,

And an auxiliary filter unit having at least one first inductor element and connected to the dc terminal,

The filter unit,

A seventh capacitor element having one end connected to the other end of the first and second capacitor elements; And

And a first resistor element connected between the first node to which the first switching element and the second switching element are connected, and the other end of the seventh capacitor element.
The method of claim 4,

The filter unit,

And a second resistor element, one end of which is connected to the other end of the first and second capacitor elements, and the other end of which is connected to the second node where the fifth and sixth capacitor elements are connected to each other. Converter.
The method of claim 5,

A second inductor element connected in parallel with the first resistance element; And

And an eighth capacitor element connected in parallel to the second resistance element.
The method of claim 6,

The filter unit,

And a ninth capacitor element and a third resistor element connected in series with each other and connected between the first node and the ground terminal.
The method of claim 7, wherein

The filter unit,

And a fourth resistance element connected between the gate terminal or the base terminal of the first switching element and the gate terminal or the base terminal of the second switching element.
The method of claim 8,

The filter unit,

A fifth resistance element connected between the first switching element and the first node; And

And a sixth resistor element connected between the second switching element and the first node.
A vehicle comprising the power conversion device according to any one of claims 1 to 9.