Electric drive and charging system integrated with charging power factor correction function and vehicle

Abstract

The invention discloses an electric driving and charging system integrated with a charging power factor correction function and a vehicle, and relates to the technical field of multiplexing of a charging power factor correction circuit based on an electric driving system.The electric driving and charging system integrated with the charging power factor correction function comprises an electric driving system circuit and a charger circuit, the electric drive system circuit comprises a direct-current power supply, a bus capacitor, a motor winding, a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, and the charger circuit reuses the electric drive system circuit structure to replace a charging power factor correction circuit by connecting the motor winding, the three-phase bridge arm and the bus capacitor of the electric drive system circuit. The technical effects of saving a rectification module circuit of the vehicle-mounted charger and integrating a circuit structure of the vehicle-mounted charger are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging power factor correction circuit multiplexing based on an electric drive system, in particular to an electric drive and charging system integrated with charging power factor correction function and a vehicle. BACKGROUND

[0002] At present, an electric vehicle generally adopts an independently set vehicle-mounted charger circuit topology and an electric drive system circuit topology. Since the vehicle-mounted charger circuit topology and the electric drive system circuit topology are independent of each other, they do not affect each other. When the vehicle-mounted charger circuit works, the electric drive system circuit stops working; when the electric drive system circuit works, the vehicle-mounted charger circuit stops working. However, the vehicle-mounted charger is installed on the electric vehicle, so the independent setting mode of the vehicle-mounted charger circuit topology and the electric drive system circuit topology not only increases the volume and weight of the electric vehicle, but also increases the cost of the entire electric vehicle. SUMMARY

[0003] In order to solve at least one aspect of the above technical problems, an embodiment of the present application provides an electric drive and charging system integrated with charging power factor correction function, comprising:

[0004] An electric drive system circuit, the electric drive system circuit comprises a direct current power supply, a bus capacitor, a motor winding, a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, the bus capacitor, the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are respectively connected in parallel across the two ends of the direct current power supply, the motor winding comprises a first winding, a second winding and a third winding, the output end of the first winding is connected between the upper bridge arm and the lower bridge arm of the first phase bridge arm, the output end of the second winding is connected between the upper bridge arm and the lower bridge arm of the second phase bridge arm, and the output end of the third winding is connected between the upper bridge arm and the lower bridge arm of the third phase bridge arm;

[0005] A charger circuit, the charger circuit comprises a first switching circuit, a second switching circuit, a rectifier circuit and a DC / DC power supply, the two ends of the first switching circuit are respectively connected to the center points of the first winding and the second winding, the two ends of the second switching circuit are respectively connected to the center points of the second winding and the third winding, the rectifier circuit comprises a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode, the anode of the first rectifier diode and the cathode of the third rectifier diode are connected with an alternating current positive input, the anode of the fourth rectifier diode and the cathode of the second rectifier diode are connected with an alternating current negative input, the anode of the third rectifier diode and the anode of the second rectifier diode are connected with the center point of the first winding, and the cathode of the first rectifier diode and the cathode of the fourth rectifier diode are connected with the center point of the second winding, and the DC / DC power supply is connected in parallel with the bus capacitor, the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

[0006] Preferably, the upper bridge arm of the first phase bridge arm comprises a first phase upper bridge arm switch and a first phase upper bridge arm diode, the lower bridge arm of the first phase bridge arm comprises a first phase lower bridge arm switch and a first phase lower bridge arm diode, the upper bridge arm of the second phase bridge arm comprises a second phase upper bridge arm switch and a second phase upper bridge arm diode, the lower bridge arm of the second phase bridge arm comprises a second phase lower bridge arm switch and a second phase lower bridge arm diode, the upper bridge arm of the third phase bridge arm comprises a third phase upper bridge arm switch and a third phase upper bridge arm diode, and the lower bridge arm of the third phase bridge arm comprises a third phase lower bridge arm switch and a third phase lower bridge arm diode.

[0007] Preferably, the first phase upper bridge arm switch and the first phase lower bridge arm switch are triodes.

[0008] Preferably, the second phase bridge arm and the third phase bridge arm adopt the same circuit topology as the first phase bridge arm.

[0009] Preferably, the first switch circuit comprises a first switch, and the second switch circuit comprises a second switch, and the first switch and the second switch are closed when the charging machine circuit is charging.

[0010] In another aspect, a vehicle is provided, comprising the integrated charging power factor correction function electric drive and charging system as described in any one of the preceding aspects.

[0011] The integrated charging power factor correction function electric drive and charging system of the embodiments of the present application has the following technical effects: when the vehicle is charged by alternating current, the power factor correction function is realized by multiplexing the electric drive system part circuit, and the vehicle-mounted charging machine rectifier module circuit can be saved. In the structure of the vehicle-mounted electric drive system, the power factor correction module function of the vehicle-mounted charging machine is realized by using the electric drive system topology circuit, the structure is multiplexed, the material cost is saved, and the charging function integration of the electric drive system is realized. BRIEF DESCRIPTION OF DRAWINGS

[0012] For better understanding of the above and other objects, features, advantages and functions of the present application, reference can be made to the embodiments shown in the drawings. The same reference signs in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to illustrate the preferred embodiments of the present application, and have no limiting effect on the scope of the present application, and the various parts in the drawings are not drawn to scale.

[0013] Figure 1 A structure schematic diagram of a multiplexed power factor correction circuit is shown;

[0014] Figure 2 A structure schematic diagram of an electric drive system circuit is shown;

[0015] Figure 3 A structure schematic diagram of a vehicle-mounted charging machine circuit with an independent power factor correction circuit is shown;

[0016] Figure 4 A current flow diagram showing the AC positive half cycle bridge arm conduction of a multiplexed power factor correction circuit is shown;

[0017] Figure 5 A current flow diagram showing the AC positive half cycle bridge arm disconnection of a multiplexed power factor correction circuit is shown;

[0018] Figure 6 A current flow diagram showing the AC negative half cycle bridge arm disconnection of a multiplexed power factor correction circuit is shown;

[0019] Figure 7 A current flow diagram showing the AC negative half cycle bridge arm disconnection of a multiplexed power factor correction circuit is shown. DETAILED DESCRIPTION

[0020] Exemplary embodiments of the present disclosure are described herein with reference to the accompanying drawings, which are included to provide a thorough understanding of embodiments of the present disclosure by individuals of ordinary skill in the art, and should not be construed as a complete recitation of all the aspects of the present disclosure. Accordingly, those of ordinary skill in the art will recognize that modifications and variations of the described embodiments can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions can be omitted for clarity and conciseness.

[0021] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or variations thereof, are intended to cover a non-exclusive inclusion. The term "or" is intended to mean "and / or" unless otherwise indicated. The term "based on" means "based, at least in part, on." The terms "one example embodiment" and "an example embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "a first," "a second," etc. do not require that there be only one of the indicated objects. Other definitions can be found in the following detailed description.

[0022] To at least partially solve one or more of the above problems and other potential problems, embodiments of the present disclosure provide an electric drive and charging system integrated with a charging power factor correction function, including: an electric drive system circuit and a charger circuit, the electric drive system circuit including a DC power supply, a bus capacitor, motor windings, a first phase bridge arm, a second phase bridge arm, and a third phase bridge arm, the bus capacitor, the first phase bridge arm, the second phase bridge arm, and the third phase bridge arm being connected in parallel across the DC power supply, the motor windings including a first winding, a second winding, and a third winding, an output end of the first winding being connected between an upper bridge arm and a lower bridge arm of the first phase bridge arm, an output end of the second winding being connected between an upper bridge arm and a lower bridge arm of the second phase bridge arm, and an output end of the third winding being connected between an upper bridge arm and a lower bridge arm of the third phase bridge arm; the charger circuit including a first switching circuit, a second switching circuit, a rectifier circuit, and a DC / DC power supply, two ends of the first switching circuit being connected to center points of the first winding and the second winding, respectively, two ends of the second switching circuit being connected to center points of the second winding and the third winding, respectively, the rectifier circuit including a first rectifier diode, a second rectifier diode, a third rectifier diode, and a fourth rectifier diode, a positive electrode of the first rectifier diode and a negative electrode of the third rectifier diode being connected to an AC positive input, a positive electrode of the fourth rectifier diode and a negative electrode of the second rectifier diode being connected to an AC negative input, a positive electrode of the third rectifier diode and a positive electrode of the second rectifier diode being connected to the center point of the first winding, and a negative electrode of the first rectifier diode and a negative electrode of the fourth rectifier diode being connected to the center point of the second winding, the DC / DC power supply being connected in parallel with the bus capacitor.

[0023] Specifically, as shown in Figure 2 , the bus capacitor, the first phase bridge arm, the second phase bridge arm, and the third phase bridge arm of the electric drive system circuit are used to connect the motor windings and the DC power supply, to achieve power transmission between the DC power supply and the motor windings, and to achieve rapid disconnection of the power supply connection through the bridge arm in an emergency braking mode, and to achieve safety protection by discharging the bus capacitor.

[0024] The on-board charger circuit is used to charge the on-board power supply. The on-board charger circuit with an independent power factor correction module (PFC module) is as shown in Figure 3 , the power factor correction module includes a PFC module boost inductor L11, a PFC module boost inductor L12, a PFC module diode D16, a PFC module diode D15, a PFC module capacitor, a PFC module switch K12, and a PFC module switch K11. The rectifier circuit of the charger circuit includes a third rectifier diode D13, a first rectifier diode D11, a second rectifier diode D12, and a fourth rectifier diode D14.

[0025] As shown in Figure 3As shown, the positive pole of the first rectifier diode D11 and the negative pole of the third rectifier diode D13 are connected with the positive pole input of the alternating current, the positive pole of the fourth rectifier diode D14 and the negative pole of the second rectifier diode D12 are connected with the negative pole input of the alternating current, and the positive pole of the third rectifier diode D13 and the positive pole of the second rectifier diode D12 are connected with the negative pole of the DC / DC power supply.

[0026] The PFC module boost inductor L11 and the PFC module diode D15 are connected in series in the first boost circuit of the PFC module. The PFC module boost inductor L12 and the PFC module diode D16 are connected in series in the second boost circuit of the PFC module. The first boost circuit and the second boost circuit of the PFC module are connected in parallel, and the two ends of the circuit are respectively connected with the negative pole of the first rectifier diode D11, the negative pole of the fourth rectifier diode D14 and the positive pole of the DC / DC power supply.

[0027] The two ends of the PFC module capacitor are respectively connected with the positive pole and the negative pole of the DC / DC power supply. The PFC module switch K12 is connected with the first boost circuit and the negative pole of the DC / DC power supply, and the connection point of the PFC module switch K12 with the first boost circuit is at the positive pole end of the PFC module diode D15. The PFC module switch K11 is connected with the second boost circuit and the negative pole of the DC / DC power supply, and the connection point of the PFC module switch K11 with the second boost circuit is at the positive pole end of the PFC module diode D16.

[0028] In the embodiment, as shown in the figure, Figure 1 The charger circuit includes a first switch circuit, a second switch circuit, a rectifier circuit and a DC / DC power supply. The two ends of the first switch circuit are respectively connected with the center points of the first winding U and the second winding V. The two ends of the second switch circuit are respectively connected with the center points of the second winding U and the third winding W. The connection switching of the motor windings is realized by setting the first switch circuit and the second switch circuit. The DC / DC power supply of the charger circuit is connected with the bus capacitor, the first phase bridge arm, the second phase bridge arm and the third phase bridge arm, so as to realize the replacement of the PFC module boost inductor L11, the PFC module boost inductor L12, the PFC module diode D16, the PFC module diode D15, the PFC module capacitor, the PFC module switch K12 and the PFC module switch K11 in the PFC module.

[0029] In some embodiments, the upper arm of the first phase bridge arm includes a first phase upper bridge arm switch and a first phase upper bridge arm diode D1, the lower arm of the first phase bridge arm includes a first phase lower bridge arm switch 10 and a first phase lower bridge arm diode D4, the upper arm of the second phase bridge arm includes a second phase upper bridge arm switch and a second phase upper bridge arm diode D3, the lower arm of the second phase bridge arm includes a second phase lower bridge arm switch and a second phase lower bridge arm diode D6, the upper arm of the third phase bridge arm includes a third phase upper bridge arm switch and a third phase upper bridge arm diode D5, and the lower arm of the third phase bridge arm includes a third phase lower bridge arm switch and a third phase lower bridge arm diode D2.

[0030] Specifically, if Figure 2 As shown, the first-phase upper bridge arm switch and the first-phase lower bridge arm switch use transistors.

[0031] The first phase upper bridge arm switch uses a transistor K1, and the transistor K1 and the diode D1 form the first phase upper bridge arm; the first phase lower bridge arm switch uses a transistor K4, and the transistor K4 and the diode D4 form the first phase lower bridge arm.

[0032] The second phase bridge arm and the third phase bridge arm adopt the same circuit topology as the first phase bridge arm.

[0033] Specifically, if Figure 1 and Figure 2 As shown, the second-phase upper bridge arm switch adopts a transistor K3, and the transistor K3 and the diode D3 form the second-phase upper bridge arm; the second-phase lower bridge arm switch adopts a transistor K4, and the transistor K4 and the diode D4 form the second-phase lower bridge arm.

[0034] The third-phase upper bridge arm switch adopts transistor K5, and transistor K5 and diode D5 form the third-phase upper bridge arm; the third-phase lower bridge arm switch adopts transistor K6, and transistor K6 and diode D6 form the third-phase lower bridge arm.

[0035] In some embodiments, the first switch circuit includes a first switch, the second switch circuit includes a second switch, and the first switch and the second switch are closed when the charger circuit is charging.

[0036] Specifically, if Figure 1 As shown, the first switch circuit and the second switch circuit respectively use the first switch S1 and the second switch S2 to connect and disconnect the center points of the first winding U, the second winding V and the third winding W.

[0037] Example 1

[0038] During the positive half cycle of the AC input: the first switch S1 and the second switch S2 are closed, the first phase upper bridge arm switch K1, the third phase lower bridge arm switch K2, the first phase lower bridge arm switch K4, the third phase upper bridge arm switch K5, and the second phase lower bridge arm switch K6 are all open, and the second phase upper bridge arm switch K3 is in PWM control, such as Figure 4 As shown, when the second-phase upper bridge arm switch K3 is closed and turned on, the diode D4 is turned on, and the input AC power passes through the rectifier circuit and then passes through the second-phase winding V, the second-phase bridge arm point b, the diode D3 of the second-phase upper bridge arm, flows to the bus capacitor and the DC / DC power supply, and then passes through the diode D4 of the first-phase lower bridge arm, the first-phase bridge arm point a, the first-phase winding U, and then flows out through the rectifier circuit.

[0039] When the second phase upper bridge arm switch K3 is turned on and off, the diode D4 is turned on. Figure 5 As shown, the input AC power passes through the rectifier circuit and sequentially passes through the second phase winding V, the second phase bridge arm point b, the transistor K6 of the second phase lower bridge arm, the diode D4 of the first phase lower bridge arm, the first phase bridge arm point a, the first phase winding U, and then flows out through the rectifier circuit, forming an independent current loop between the bus capacitor and the DC / DC power supply.

[0040] During the negative half cycle of the AC input: close the first switch S1 and the second switch S2, the first phase upper bridge arm switch K1, the third phase lower bridge arm switch K2, the first phase lower bridge arm switch K4, the third phase upper bridge arm switch K5, and the second phase lower bridge arm switch K6 are all open, and the second phase upper bridge arm switch K3 is in PWM control, such as Figure 6 As shown in the figure, when the second-phase upper bridge arm switch K3 is closed and turned on, the diode D6 is turned on, and the input AC power passes through the rectifier circuit and then passes through the first-phase winding U, the first-phase bridge arm point a, the diode D1 of the first-phase upper bridge arm, flows to the bus capacitor and the DC / DC power supply, and then passes through the diode D6 of the second-phase lower bridge arm, the second-phase bridge arm point b, the second-phase winding V, and then flows out through the rectifier circuit.

[0041] When the second phase upper bridge arm switch K3 is turned on and off, the diode D6 is turned on and the current flows to Figure 7 As shown, the input AC power passes through the rectifier circuit, sequentially passing through the first-phase winding U, the first-phase bridge arm point a, the first-phase lower bridge arm switch K4, the second-phase lower bridge arm diode D6, the second-phase bridge arm point b, the second-phase winding V, and finally out through the rectifier circuit. An independent current loop is formed between the bus capacitor and the DC / DC power supply.

[0042] On the other hand, a vehicle is provided, comprising an electric drive and charging system with integrated charging power factor correction function as described above.

[0043] Having described various embodiments of the disclosure above, the descriptions are not exhaustive and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art. The selection of terms to be used in the description is intended to best explain the principles of the embodiments, practical application, or technical improvement over the prior art, or to enable other skilled persons in the art to understand the present document.

Claims

1. An electric drive and charging system with integrated charging power factor correction function, characterized in that: include: An electric drive system circuit includes a DC power supply, a bus capacitor, a motor winding, a first-phase bridge arm, a second-phase bridge arm, and a third-phase bridge arm. The bus capacitor, the first-phase bridge arm, the second-phase bridge arm, and the third-phase bridge arm are respectively connected in parallel at both ends of the DC power supply. The motor winding includes a first winding, a second winding, and a third winding. The output end of the first winding is connected between the upper bridge arm and the lower bridge arm of the first-phase bridge arm, the output end of the second winding is connected between the upper bridge arm and the lower bridge arm of the second-phase bridge arm, and the output end of the third winding is connected between the upper bridge arm and the lower bridge arm of the third-phase bridge arm. The charger circuit includes a first switching circuit, a second switching circuit, a rectifier circuit and a DC / DC power supply. The two ends of the first switching circuit are respectively connected to the center points of the first winding and the second winding, and the two ends of the second switching circuit are respectively connected to the center points of the second winding and the third winding. The rectifier circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode and a fourth rectifier diode. The positive electrode of the first rectifier diode and the negative electrode of the third rectifier diode are connected to the AC positive input, the positive electrode of the fourth rectifier diode and the negative electrode of the second rectifier diode are connected to the AC negative input, the positive electrode of the third rectifier diode and the positive electrode of the second rectifier diode are connected to the center point of the first winding, the negative electrode of the first rectifier diode and the negative electrode of the fourth rectifier diode are connected to the center point of the second winding, and the DC / DC power supply is respectively connected in parallel with the bus capacitor, the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

2. The system according to claim 1, wherein: The upper bridge arm of the first phase bridge arm includes a first phase upper bridge arm switch and a first phase upper bridge arm diode, the lower bridge arm of the first phase bridge arm includes a first phase lower bridge arm switch and a first phase lower bridge arm diode, the upper bridge arm of the second phase bridge arm includes a second phase upper bridge arm switch and a second phase upper bridge arm diode, the lower bridge arm of the second phase bridge arm includes a second phase lower bridge arm switch and a second phase lower bridge arm diode, the upper bridge arm of the third phase bridge arm includes a third phase upper bridge arm switch and a third phase upper bridge arm diode, and the lower bridge arm of the third phase bridge arm includes a third phase lower bridge arm switch and a third phase lower bridge arm diode.

3. The system according to claim 2, characterized in that The first-phase upper bridge arm switch and the first-phase lower bridge arm switch adopt triodes.

4. The system according to claim 3, characterized in that The second phase bridge arm and the third phase bridge arm adopt the same circuit topology as the first phase bridge arm.

5. The system according to claim 2, wherein: The first switch circuit includes a first switch, and the second switch circuit includes a second switch. The first switch and the second switch are closed when the charger circuit is charging.

6. A vehicle, characterized in that: An electric drive and charging system comprising an integrated charging power factor correction function as described in any one of claims 1 to 5.

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