Three-phase and single-phase two-in-one power factor correction circuit, charging equipment and vehicle

Abstract

The utility model provides a three-phase and single-phase two-in-one power factor correction circuit, charging equipment and a vehicle, and belongs to the technical field of charging and discharging, and the three-phase and single-phase two-in-one power factor correction circuit comprises a circuit module and a filtering module; the filtering module is connected with an inductance unit in the circuit module, and the filtering module reduces electromagnetic interference of the power factor correction circuit under the condition that the power factor correction circuit is in a three-phase or single-phase working mode.

Description

Technical Field

[0001] The present disclosure relates to the technical field of charging and discharging, and in particular to a three-phase and single-phase two-in-one power factor correction circuit, a charging device and a vehicle. Background Art

[0002] At present, electric vehicles are generally equipped with an AC charging circuit, which converts the AC power output by external devices into DC power and then charges the battery, or converts the DC power output by the battery into AC power and then outputs AC power to external devices. In the AC charging circuit, the power factor correction circuit is an indispensable part. In the prior art, there are two-in-one power factor correction circuits of three-phase power factor correction and one-way power factor correction. However, during the operation of the power factor correction circuit, the inductor front end of the power factor correction circuit has a certain degree of EMI (Electromagnetic Interference) crosstalk to the surrounding circuits. Deteriorate the EMC (Electromagnetic Compatibility) performance of the whole machine. Utility Model Content

[0003] The embodiments of the present disclosure provide a three-phase single-phase two-in-one power factor correction circuit and a charging device, which can solve the electromagnetic interference problem of the three-phase single-phase two-in-one power factor correction circuit.

[0004] In a first aspect, the present application provides a three-phase single-phase two-in-one power factor correction circuit, including: a circuit module and a filter module

[0005] The filter module is connected to the inductor unit in the circuit module. When the power factor correction circuit is in a three-phase or single-phase working mode, the filter module reduces the electromagnetic interference of the power factor correction circuit.

[0006] Optionally, when the power factor correction circuit is in a three-phase working mode, the filtering module is arranged between the inductance unit and the bus midpoint as a high-frequency low-resistance feedback circuit; when the power factor correction circuit is in a single-phase working mode, the filtering module is arranged between the inductance unit and the neutral line input terminal as an X capacitor.

[0007] Optionally, the circuit module further includes a switch unit;

[0008] The switch unit is arranged between the phase line input terminal and the inductor unit;

[0009] The switch unit is used to control the power factor correction circuit to enter a three-phase working mode or a single-phase working mode.

[0010] Optionally, the circuit module further includes an inductor unit, the inductor unit includes a first inductor, a second inductor and a third inductor, and the bridge arm unit includes a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm;

[0011] The first end of the first inductor is connected to the first phase line input end of the phase line input end through the switch unit, and the second end of the first inductor is connected to the bridge arm midpoint of the first bridge arm;

[0012] The first end of the second inductor is connected to the second phase line input end of the phase line input end through the switch unit, and the second end of the second inductor is connected to the bridge arm midpoint of the second bridge arm;

[0013] The first end of the third inductor is connected to the third phase line input end of the phase line input end through the switch unit, and the second end of the third inductor is connected to the bridge arm midpoint of the third bridge arm;

[0014] The zero line input end is connected to the bridge arm midpoint of the fourth bridge arm.

[0015] Optionally, the switch unit includes a first switch, a second switch and a third switch;

[0016] A first end of the first switch is connected to the first phase line input end, and a second end of the first switch is connected to the first inductor;

[0017] The second switch is a single-pole double-throw switch, two fixed ends of the second switch are respectively connected to the first phase line input end and the second phase line input end, and a moving end of the second switch is connected to the second inductor;

[0018] A first end of the third switch is connected to the third phase line input end, and a second end of the third switch is connected to the third inductor.

[0019] Optionally, the filtering module includes a fourth switch and a filtering circuit;

[0020] The fourth switch is a single-pole double-throw switch, the two fixed ends of the fourth switch are respectively connected to the bus midpoint of the power factor correction circuit and the neutral line input end, and the moving end of the fourth switch is connected to the filter circuit.

[0021] Optionally, the filtering circuit includes a first capacitor, a second capacitor and a third capacitor;

[0022] The first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively.

[0023] Optionally, the first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively, including:

[0024] The first capacitor is connected to the second end of the first switch, the second capacitor is connected to the second end of the second switch, and the third switch is connected to the first end of the third switch.

[0025] Optionally, the first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively, including:

[0026] The first capacitor is connected to the second end of the first switch, the second capacitor is connected to the second end of the second switch, and the third switch is connected to the second end of the third switch.

[0027] Optionally, the power factor correction circuit is used to implement at least one of the following working modes under the control of the control circuit:

[0028] Three-phase working mode; corresponding to the three-phase working mode, the first switch and the third switch are closed, the moving end of the second switch is connected to the second phase line input, and the moving end of the fourth switch is connected to the busbar midpoint;

[0029] Single-phase working mode; corresponding to the single-phase working mode, the first switch is closed, the third switch is opened, the moving end of the second switch is connected to the first phase line input, and the moving end of the fourth switch is connected to the neutral line input.

[0030] Optionally, an AC filter is further provided between the phase line input terminal and the switch unit.

[0031] In a second aspect, an embodiment of the present application provides a charging device, including a battery and a three-phase single-phase two-in-one power factor correction circuit as described in any one of the first aspects.

[0032] In a third aspect, an embodiment of the present application provides a vehicle, comprising a power battery and a three-phase single-phase two-in-one power factor correction circuit as described in any one of the first aspects.

[0033] A beneficial effect of the embodiments of the present disclosure is that the phase line input terminal, the inductance unit and the bridge arm unit of the power factor correction circuit in the three-phase and single-phase two-in-one power factor correction circuit are connected in sequence. At the same time, the filter module can reduce the electromagnetic interference of the power factor correction circuit in the three-phase or single-phase working mode and improve the EMC performance.

[0034] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0036] Figure 1 A block diagram of a three-phase and single-phase two-in-one power factor correction circuit according to an embodiment of the present disclosure is shown.

[0037] Figure 2 A schematic diagram of a three-phase single-phase two-in-one power factor correction circuit in a single-phase working mode is shown according to an embodiment of the present disclosure.

[0038] Figure 3 A schematic diagram of a three-phase and single-phase two-in-one power factor correction circuit in a three-phase working mode is shown in an embodiment of the present disclosure.

[0039] Figure 4 A schematic diagram of a three-phase and single-phase two-in-one power factor correction circuit showing another connection mode of an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] like Figure 1As shown, an embodiment of the present application introduces a three-phase and single-phase two-in-one power factor correction circuit, including: a circuit module and a filter module, the filter module is connected to the inductance unit in the circuit module, and the filter module reduces the electromagnetic interference of the power factor correction circuit when the power factor correction circuit is in a three-phase or single-phase working mode.

[0046] In an example of this embodiment, when the power factor correction circuit is in a three-phase working mode, the filter module is arranged between the inductor unit and the bus midpoint as a high-frequency low-resistance feedback circuit, and when the power factor correction circuit is in a single-phase working mode, the filter module is arranged between the inductor unit and the neutral line input terminal as an X capacitor.

[0047] In this embodiment, the circuit module may include a switch unit, an inductor unit and a bridge arm unit connected in sequence. The phase line input end of the circuit is connected to the switch unit.

[0048] In one example, the power factor correction circuit further includes: a switch unit; the switch unit is arranged between the phase line input terminal and the inductor unit; the switch unit is used to control the power factor correction circuit to enter a three-phase working mode or a single-phase working mode.

[0049] In this embodiment, the circuit may further include a switch unit arranged between the phase line input terminal and the inductance unit. Multiple switches may be arranged in the switch unit to control the working mode of the power factor correction circuit. Specifically, it may include a three-phase working mode and a single-phase working mode. The three-phase working mode is the working mode when the power factor correction circuit is powered by three-phase alternating current, and the same is true for the single-phase working mode.

[0050] In an embodiment of the present application, the phase line input end of the power factor correction circuit may include three phase line input ports, namely a first phase line input end, a second phase line input end and a third phase line input end, and these three input ports may be any one of phase line A, phase line B and phase line C, respectively. When the power factor correction circuit is in a three-phase working mode, the three phase line ports work simultaneously. In a single-phase working mode, it can work through one of the three ports based on a specific circuit connection. In addition, the zero line input end of the power factor correction can also be connected to the bridge arm unit.

[0051] In an example of the present embodiment, the inductance unit includes a first inductance, a second inductance and a third inductance, and the bridge arm unit includes a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm; the first end of the first inductance is connected to the first phase line input end of the phase line input end through the switch unit, and the second end of the first inductance is connected to the midpoint of the bridge arm of the first bridge arm; the first end of the second inductance is connected to the second phase line input end of the phase line input end through the switch unit, and the second end of the second inductance is connected to the midpoint of the bridge arm of the second bridge arm; the first end of the third inductance is connected to the third phase line input end of the phase line input end through the switch unit, and the second end of the third inductance is connected to the midpoint of the bridge arm of the third bridge arm; the neutral line input end is connected to the midpoint of the bridge arm of the fourth bridge arm.

[0052] In one example, the bridge arm unit includes four bridge arms connected in parallel to the busbar of the power factor correction circuit, and each bridge arm is connected in series with at least two switching tubes to perform rectification to achieve the function of power factor correction.

[0053] In one example, the inductor unit may include a first inductor, a second inductor, and a third inductor, one end of each of the three inductors may be connected to the three phase line input ends through the switch unit, and the other end of each inductor may be connected to the midpoints of the three bridge arms in the bridge arm unit. Figure 2 As shown, one end of the first inductor is connected to the phase line A through the switch unit, and the other end is connected to the midpoint of the bridge arm of the first bridge arm. One end of the second inductor is connected to the phase line B through the switch unit, and the other end is connected to the midpoint of the bridge arm of the second bridge arm. One end of the third inductor is connected to the phase line C through the switch unit, and the other end is connected to the midpoint of the bridge arm of the third bridge arm.

[0054] In an example of the present embodiment, the switch unit includes a first switch, a second switch and a third switch; the first end of the first switch is connected to the first phase line input end, and the second end of the first switch is connected to the first inductor; the second switch is a single-pole double-throw switch, the two fixed ends of the second switch are respectively connected to the first phase line input end and the second phase line input end, and the moving end of the second switch is connected to the second inductor; the first end of the third switch is connected to the third phase line input end, and the second end of the third switch is connected to the third inductor.

[0055] In this embodiment, the switch unit includes a first switch, a second switch and a third switch, wherein the first switch and the third switch may be single-pole single-throw switches, and the second switch may be a single-pole double-throw switch. The first switch may be arranged between the first inductor and the first phase line input terminal, and the third switch may be arranged between the third inductor and the third phase line input terminal. At the same time, the moving end of the second switch is connected to the second inductor, and the two fixed ends are respectively connected to the first phase line input terminal and the second phase line input terminal. In this example, when the power factor correction circuit is in a three-phase working mode, if the first switch and the third switch can be turned on, the moving end of the second switch is connected to the second phase line input terminal, so that the three input terminals of the phase line are respectively connected to the three inductors of the inductor unit, and the function of three-phase power factor correction is realized. When the power factor correction circuit is in a single-phase working mode, the first switch may be turned on, the moving end of the second switch is connected to the first phase line input terminal, and the third switch is turned off, so that the first input terminal of the phase line is respectively connected to the two inductors of the inductor unit, and the function of single-phase power factor correction is realized.

[0056] In an example of this embodiment, the filtering module includes a fourth switch and a filtering circuit; the fourth switch is a single-pole double-throw switch, the two fixed ends of the fourth switch are respectively connected to the bus neutral point of the power factor correction circuit and the neutral line input end, and the moving end of the fourth switch is connected to the filtering circuit.

[0057] In an example of this embodiment, the filtering circuit includes a first capacitor, a second capacitor and a third capacitor; the first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively.

[0058] In one example, the filter module also includes a fourth switch and a filter circuit, and the filter circuit includes three capacitors, which are respectively connected to the first switch, the second switch and the third switch of the switch unit. The fourth switch can be a single-pole double-throw switch, the moving end of the fourth switch is connected to the filter circuit, and the two fixed ends are respectively connected to the first phase line input end and the second phase line input end. In different working modes, the fourth switch can control the moving end to be connected and turned on with one of the two fixed ends. For example, in the three-phase working mode, the moving end of the fourth switch is connected to the bus midpoint to form a high-frequency EMI low-resistance feedback circuit, and the EMI interference at the front end of the three-phase inductor is pulled to the reference ground (bus midpoint) of the power factor correction circuit through this low-resistance loop, thereby reducing the EMI interference amplitude of the inductor unit. In the single-phase working mode, the moving end of the fourth switch can be connected to the neutral line input end, and a filter capacitor is added between the front end of the inductor of the working inductor unit and the neutral line, which is equivalent to the X capacitor, thereby greatly reducing the high-frequency interference loop area of ​​the power factor correction circuit and reducing EMI crosstalk.

[0059] In this embodiment, the busbar midpoint may be a midpoint between busbar motors or resistors provided at the rear end of the power factor correction busbar.

[0060] In an example of this embodiment, the first capacitor, the second capacitor and the third capacitor are respectively connected to the first switch, the second switch and the third switch, including: the first capacitor is connected to the second end of the first switch, the second capacitor is connected to the second end of the second switch, and the third switch is connected to the first end of the third switch.

[0061] like Figure 2 As shown, in this embodiment, one end of the first capacitor, the second capacitor and the third capacitor are all arranged between their corresponding switches and inductors, and the other ends are connected to the zero line input terminal or the busbar midpoint through the fourth switch, thereby forming a high-frequency low-resistance path to reduce EMI interference.

[0062] In an example of this embodiment, the first capacitor, the second capacitor and the third capacitor are respectively connected to the first switch, the second switch and the third switch, including: the first capacitor is connected to the second end of the first switch, the second capacitor is connected to the second end of the second switch, and the third switch is connected to the second end of the third switch.

[0063] like Figure 4 As shown, in this embodiment, one end of the first capacitor and the second capacitor are all arranged between their corresponding switches and inductors, and one end of the third capacitor is arranged between the third switch and the phase line input terminal. When the power factor correction circuit is in three-phase working mode, the other ends of the three capacitors are connected to the bus midpoint through the fourth switch. Thereby forming a high-frequency low-resistance path to reduce EMI interference. When the power factor correction circuit is in single-phase working mode, the third inductor and the third bridge arm are in an idle and non-working state. If the third inductor and the first and second inductors are placed closely, electromagnetic coupling may occur, and the switch tube in the bridge arm also includes a body diode. If the third capacitor is connected to the inductor and the bridge arm, a high-frequency closed circuit may be formed to generate electromagnetic interference. Therefore, the third capacitor can be set between the third switch and the phase line input terminal to avoid this situation.

[0064] In one example of the present embodiment, the power factor correction circuit is used to implement at least one of the following operating modes under the control of the control circuit: a three-phase operating mode; corresponding to the three-phase operating mode, the first switch and the third switch are closed, the moving end of the second switch is connected to the second phase line input, and the moving end of the fourth switch is connected to the bus neutral point; a single-phase operating mode; corresponding to the single-phase operating mode, the first switch is closed, the third switch is opened, the moving end of the second switch is connected to the first phase line input, and the moving end of the fourth switch is connected to the neutral line input.

[0065] In some embodiments, the control circuit may send a control signal to control the operation of each circuit in the above-mentioned power factor correction circuit, for example: the control signal output by the control circuit to the power factor correction circuit causes the switch device of the power factor correction circuit to operate. Among them, the control circuit may include a control chip, which is not specifically limited here. Accordingly, the working mode implemented by the power factor correction circuit under the control of the control circuit may include a three-phase working mode and a single-phase working mode.

[0066] In three-phase mode, if Figure 3 As shown, the first switch and the third switch are closed, the moving end of the second switch is connected to the second phase line input, and the moving end of the fourth switch is connected to the busbar midpoint. The three input ends of the phase line are respectively connected to the three inductors of the inductor unit to achieve the function of three-phase power factor correction. The moving end of the fourth switch is connected to the busbar midpoint, and a high-frequency EMI low-resistance feedback circuit can also be formed to pull the EMI interference at the front end of the three-phase inductor to the reference ground (busbar midpoint) of the power factor correction circuit through this low-resistance loop, thereby reducing the EMI interference amplitude of the inductor unit.

[0067] In single-phase operation mode, Figure 2 As shown, the first switch can be turned on, the moving end of the second switch is connected to the first phase line input end, and the third switch is turned off, so that the first input end of the phase line is respectively connected to the two inductors of the inductor unit to achieve the function of single-phase power factor correction. The moving end of the fourth switch can be connected to the neutral line input end, and a filter capacitor is added between the front end of the inductor of the working inductor of the inductor unit and the neutral line, thereby greatly reducing the high-frequency interference loop area of ​​the power factor correction circuit and reducing EMI crosstalk.

[0068] In one example of this embodiment, an AC filter is further provided between the phase line input terminal and the switch unit to reduce the ripple of the power factor correction circuit and improve stability.

[0069] In an example of this embodiment, a charging device is also provided, including a battery and a three-phase single-phase two-in-one power factor correction circuit of any of the above embodiments, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0070] In an example of this embodiment, a vehicle is also provided, including a power battery and a three-phase single-phase two-in-one power factor correction circuit of any of the above embodiments, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0071] Each embodiment in the present disclosure is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and equipment embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0072] The above embodiments mainly focus on describing the differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.

[0073] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A three-phase single-phase two-in-one power factor correction circuit, characterized in that: include: Circuit module and filter module; The filter module is connected to the inductor unit in the circuit module. When the power factor correction circuit is in a three-phase or single-phase working mode, the filter module reduces the electromagnetic interference of the power factor correction circuit.

2. The power factor correction circuit according to claim 1, characterized in that: When the power factor correction circuit is in a three-phase working mode, the filter module is arranged between the inductor unit and the bus neutral point as a high-frequency low-resistance feedback circuit. When the power factor correction circuit is in a single-phase working mode, the filter module is arranged between the inductor unit and the neutral line input end as an X capacitor.

3. The power factor correction circuit according to claim 1, characterized in that: The circuit module also includes a switch unit; The switch unit is arranged between the phase line input terminal and the inductor unit; The switch unit is used to control the power factor correction circuit to enter a three-phase working mode or a single-phase working mode.

4. The power factor correction circuit according to claim 3, characterized in that: The circuit module further includes a bridge arm unit, the inductance unit includes a first inductance, a second inductance and a third inductance, and the bridge arm unit includes a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm; The first end of the first inductor is connected to the first phase line input end of the phase line input end through the switch unit, and the second end of the first inductor is connected to the bridge arm midpoint of the first bridge arm; The first end of the second inductor is connected to the second phase line input end of the phase line input end through the switch unit, and the second end of the second inductor is connected to the bridge arm midpoint of the second bridge arm; The first end of the third inductor is connected to the third phase line input end of the phase line input end through the switch unit, and the second end of the third inductor is connected to the bridge arm midpoint of the third bridge arm; The zero line input terminal is connected to the bridge arm midpoint of the fourth bridge arm.

5. The power factor correction circuit according to claim 4, characterized in that: The switch unit includes a first switch, a second switch and a third switch; A first end of the first switch is connected to the first phase line input end, and a second end of the first switch is connected to the first inductor; The second switch is a single-pole double-throw switch, two fixed ends of the second switch are respectively connected to the first phase line input end and the second phase line input end, and a moving end of the second switch is connected to the second inductor; A first end of the third switch is connected to the third phase line input end, and a second end of the third switch is connected to the third inductor.

6. The power factor correction circuit according to claim 5, characterized in that: The filtering module includes a fourth switch and a filtering circuit; The fourth switch is a single-pole double-throw switch, the two fixed ends of the fourth switch are respectively connected to the bus midpoint of the power factor correction circuit and the neutral line input end, and the moving end of the fourth switch is connected to the filter circuit.

7. The power factor correction circuit according to claim 6, characterized in that: The filter circuit includes a first capacitor, a second capacitor and a third capacitor; The first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively.

8. The power factor correction circuit according to claim 7, characterized in that: The first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively, including: The first capacitor is connected to the second end of the first switch, the second capacitor is connected to the second end of the second switch, and the third switch is connected to the first end of the third switch.

9. The power factor correction circuit according to claim 7, characterized in that: The first capacitor, the second capacitor and the third capacitor are connected to the first switch, the second switch and the third switch respectively, including: The first capacitor is connected to the second end of the first switch, the second capacitor is connected to the second end of the second switch, and the third switch is connected to the second end of the third switch.

10. The power factor correction circuit according to any one of claims 6 to 9, characterized in that: The power factor correction circuit is used to implement at least one of the following working modes under the control of the control circuit: Three-phase working mode; corresponding to the three-phase working mode, the first switch and the third switch are closed, the moving end of the second switch is connected to the second phase line input, and the moving end of the fourth switch is connected to the busbar midpoint; Single-phase working mode; Corresponding to the single-phase working mode, the first switch is closed, the third switch is opened, the moving end of the second switch is connected to the first phase line input, and the moving end of the fourth switch is connected to the neutral line input.

11. The power factor correction circuit according to any one of claims 3 to 9, characterized in that: An AC filter is also provided between the phase line input terminal and the switch unit.

12. A charging device, characterized in that: The invention comprises a battery and a three-phase and single-phase two-in-one power factor correction circuit as described in any one of claims 1 to 11.

13. A vehicle, characterized in that: It comprises a power battery and a three-phase and single-phase two-in-one power factor correction circuit as described in any one of claims 1 to 11.

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