阅读说明：本技术 车载充电机和车载dc/dc的集成电路、电动汽车 (Vehicle-mounted charger, integrated circuit of vehicle-mounted DC/DC and electric automobile ) 是由 李福生 张霞 曹碧颖 于 2020-03-30 设计创作，主要内容包括：本发明公开了一种车载充电机和车载DC/DC的集成电路、电动汽车,所述集成电路包括PFC模块、高压AC侧功率开关模块、AC变压模块、模式切换模块、高压DC侧功率开关模块、DC变压模块、低压DC侧功率开关模块和主控制模块；主控制模块用于根据外部触发条件控制模式切换模块将集成电路切换至工作模式,包括充电、放电以及DC/DC工作模式。本发明中车载充电机和车载DC/DC拥有各自独立变压器,且车载充电机变压器输出侧功率电路和车载DC/DC输入侧功率电路共用,充分利用集成技术减轻集成电路的总重量、减小了体积以及降低了成本,使得容易实现产品的平台化,且从整体上优化了整车布置空间,降低了整车成本。(The invention discloses a vehicle-mounted charger, a vehicle-mounted DC/DC integrated circuit and an electric vehicle, wherein the integrated circuit comprises a PFC (Power factor correction) module, a high-voltage AC side power switch module, an AC voltage transformation module, a mode switching module, a high-voltage DC side power switch module, a DC voltage transformation module, a low-voltage DC side power switch module and a main control module; the main control module is used for controlling the mode switching module to switch the integrated circuit to a working mode according to an external trigger condition, wherein the working mode comprises a charging mode, a discharging mode and a DC/DC working mode. According to the invention, the vehicle-mounted charger and the vehicle-mounted DC/DC have respective independent transformers, and the power circuit at the output side of the transformer of the vehicle-mounted charger and the power circuit at the input side of the vehicle-mounted DC/DC share the same, so that the total weight of the integrated circuit is reduced, the size is reduced, the cost is reduced by fully utilizing the integration technology, the platformization of the product is easy to realize, the arrangement space of the whole vehicle is optimized on the whole, and the cost of the whole vehicle is reduced.)

1. The integrated circuit is characterized by comprising a PFC module, a high-voltage AC side power switch module, an AC voltage transformation module, a mode switching module, a high-voltage DC side power switch module, a DC voltage transformation module, a low-voltage DC side power switch module and a main control module;

the PFC module, the high-voltage AC side power switch module and the AC transformation module are electrically connected in sequence, the low-voltage DC side power switch module is electrically connected with the DC transformation module, and the AC transformation module and the DC transformation module are electrically connected with the high-voltage DC side power switch module through the mode switching module; the mode switching module is electrically connected with the main control module, the PFC module is also electrically connected with an external power supply, the low-voltage DC side power switch module is also electrically connected with a low-voltage battery, and the high-voltage AC side power switch module is also electrically connected with a power battery;

the main control module is used for acquiring an external trigger condition, determining a working mode of the integrated circuit according to the external trigger condition, and controlling the mode switching module to switch the integrated circuit to the working mode;

when the working mode is a charging mode:

the high-voltage AC side power switch module is used for converting the input high-frequency alternating current into high-frequency alternating current and sending the high-frequency alternating current to the AC transformation module;

or, when the working mode is a discharging mode:

the high-voltage DC side power switch module is used for converting second direct current input by the power battery into high-frequency alternating current and sending the high-frequency alternating current to the AC transformation module through the mode switching module, the AC transformation module is used for carrying out electrical isolation and LL C transformation on the input high-frequency alternating current and sending the high-frequency alternating current to the high-voltage AC side power switch module, the high-voltage AC side power switch module is used for converting the input high-frequency alternating current into first direct current and sending the first direct current to the PFC module, and the PFC module is used for converting the input first direct current into alternating current for load work;

or, when the operating mode is a DC/DC operating mode:

the high-voltage DC side power switch module is used for converting second direct current input by the power battery into high-frequency alternating current and sending the high-frequency alternating current to the DC transformation module through the mode switching module, the DC transformation module is used for carrying out electrical isolation and LL C conversion processing on the input high-frequency alternating current and sending the high-frequency alternating current to the low-voltage DC side power switch module, the low-voltage DC side power switch module is used for converting the input high-frequency alternating current into direct current to charge the low-voltage battery, and at the moment, the low-voltage DC side power switch module is in a working state of synchronous rectification and filtering.

2. The vehicle-mounted charger and integrated circuit of vehicle-mounted DC/DC according to claim 1, wherein the mode switching module is a switch.

3. The vehicle-mounted charger and integrated circuit of vehicle-mounted DC/DC according to claim 2, wherein said change-over switch comprises a double-pole double-throw switch, a combination switch or a power device switch.

4. The vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit according to claim 1, wherein the PFC module comprises a first inductor, a first capacitor, a first power switch tube unit, a second power switch tube unit, a third power switch tube unit and a fourth power switch tube unit;

one end of the first inductor is electrically connected with one end of the external power supply, and the other end of the first inductor is electrically connected with one end of the first power switch tube unit and one end of the third power switch tube unit respectively; one end of the second power switch tube unit and one end of the fourth power switch tube unit are both electrically connected with the other end of the external power supply;

the other end of the first power switch tube unit and the other end of the second power switch tube unit are electrically connected with one end of the first capacitor, the other end of the third power switch tube unit and the other end of the fourth power switch tube unit are electrically connected with the other end of the first capacitor, and the two ends of the first capacitor are electrically connected with the high-voltage AC side power switch module.

5. The vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit according to claim 4, wherein the high-voltage AC side power switch module comprises a fifth power switch tube unit, a sixth power switch tube unit, a seventh power switch tube unit and an eighth power switch tube unit;

one end of the fifth power switch tube unit and one end of the sixth power switch tube unit are both electrically connected with one end of the first capacitor, the other end of the fifth power switch tube unit is respectively electrically connected with one end of the seventh power switch tube unit and the transformer module, the other end of the sixth power switch tube unit is respectively electrically connected with one end of the eighth power switch tube unit and the transformer module, and the other end of the seventh power switch tube unit and the other end of the eighth power switch tube unit are both electrically connected with the other end of the first capacitor.

6. The vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit according to claim 5, wherein the AC transforming module comprises a second inductor, a second capacitor, a third capacitor and a first transformer;

one end of the second capacitor is electrically connected with the other end of the fifth power switch tube unit, and the other end of the second capacitor is electrically connected with one end of the first coil winding in the first transformer;

one end of the second inductor is electrically connected with the other end of the sixth power switch tube unit, and the other end of the second inductor is electrically connected with the other end of the first coil winding;

one end of the third capacitor is electrically connected with one end of a second coil winding in the first transformer, and the other end of the third capacitor and the other end of the second coil winding are both electrically connected with the mode switching module.

7. The vehicle-mounted charger and integrated circuit of vehicle-mounted DC/DC according to claim 6, wherein when the mode switching module is a double-pole double-throw switch, the mode switching module comprises a first movable end, a second movable end, a first fixed end, a second fixed end, a third fixed end and a fourth fixed end;

the first movable end corresponds to the first fixed end and the second fixed end, and the second movable end corresponds to the third fixed end and the fourth fixed end;

the other end of the third capacitor is electrically connected with the first fixed end, and the other end of the second coil winding is electrically connected with the third fixed end;

the first active end and the second active end are both electrically connected with the high voltage DC side power switch module.

8. The vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit according to claim 7, wherein the high-voltage DC side power switch module comprises a fourth capacitor, a ninth power switch tube unit, a tenth power switch tube unit, an eleventh power switch tube unit and a twelfth power switch tube unit;

one end of the ninth power switch tube unit and one end of the eleventh power switch tube unit are both electrically connected with the first movable end, and one end of the tenth power switch tube unit and one end of the twelfth power switch tube unit are both electrically connected with the second movable end;

the other end of the ninth power switch tube unit and the other end of the tenth power switch tube unit are both electrically connected with one end of the fourth capacitor and one end of the power battery, and the other end of the eleventh power switch tube unit and the other end of the twelfth power switch tube unit are both electrically connected with the other end of the fourth capacitor and the other end of the power battery.

9. The vehicle-mounted charger and integrated circuit of vehicle-mounted DC/DC according to claim 8, wherein the DC transforming module comprises a fifth capacitor, a third inductor and a second transformer;

one end of the fifth capacitor is electrically connected with the second fixed end, and the other end of the fifth capacitor is electrically connected with one end of a third coil winding in the second transformer;

one end of the third inductor is electrically connected with the fourth fixed end, and the other end of the third inductor is electrically connected with the other end of the third coil winding;

and a fourth coil winding in the second transformer is electrically connected with the low-voltage DC side power switch module.

10. The vehicle charger and integrated circuit of vehicle DC/DC according to claim 9, wherein said fourth coil winding comprises a first sub-coil winding and a second sub-coil winding;

one end of the first sub-coil winding is electrically connected with one end of the second sub-coil winding;

the low-voltage DC side power switch module comprises a sixth capacitor, a fourth inductor, a diode, a thirteenth power switch tube unit and a fourteenth power switch tube unit;

one end of the thirteenth power switching tube unit is electrically connected with the other end of the first sub-coil winding, the other end of the thirteenth power switching tube unit is electrically connected with one end of the fourteenth power switching tube unit, one end of the fourth inductor and the cathode of the diode respectively, and the other end of the fourteenth power switching tube unit is electrically connected with the other end of the second sub-coil winding;

one end of the first sub-coil winding, the anode of the diode and one end of the sixth capacitor are electrically connected with one end of the low-voltage battery, and the other end of the sixth capacitor and the other end of the fourth inductor are electrically connected with the other end of the low-voltage battery.

11. The vehicle-mounted charger and integrated circuit of vehicle-mounted DC/DC according to claim 10, wherein when the controller determines that the operation mode of the integrated circuit is the charging mode or the discharging mode:

the mode switching module is used for electrically connecting the first movable end with the first fixed end, and the second movable end is electrically connected with the third fixed end;

when the controller determines that the working mode of the integrated circuit is a DC/DC working mode, the mode switching module electrically connects the first movable end with the second fixed end, and the second movable end is electrically connected with the fourth fixed end.

12. The vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit according to claim 10 or 11, wherein the first power switch tube unit to the fourteenth power switch tube unit each include one power switch tube or a plurality of power switch tubes connected in series and/or in parallel.

13. The vehicle-mounted charger and integrated circuit of vehicle-mounted DC/DC according to claim 12, wherein the power switch tube comprises a triode, a MOS tube or an IGBT transistor.

14. An electric vehicle, characterized in that it comprises an onboard charger according to any one of claims 1 to 13 and an onboard DC/DC integrated circuit.

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a vehicle-mounted charger, a vehicle-mounted DC/DC integrated circuit and an electric automobile.

Background

The electric automobile as a clean energy vehicle has the advantages of high energy utilization efficiency, energy conservation, environmental protection, low noise and the like, and becomes the main development direction of future vehicles. The vehicle-mounted charger is used for converting commercial power into direct current to charge the power battery pack, and the vehicle-mounted DC/DC is used for converting high-voltage direct current in the power battery pack into low-voltage direct current to supply power to a low-voltage load.

With the increase of the cost and pressure of the whole electric automobile, the vehicle-mounted parts are gradually developed towards miniaturization, integration and high power density. In order to improve the situation of the vehicle-mounted charger and the vehicle-mounted DC/DC discrete configuration, the following two integration schemes are mainly used in the field: (1) the vehicle-mounted charger and the vehicle-mounted DC/DC share the electrical connection, the water cooling plate and the shell, and electronic circuits of the vehicle-mounted charger and the vehicle-mounted DC/DC are independent and do not influence each other, so that the problems of low integration level, large assembly volume, high cost and the like exist in the scheme. (2) The magnetic integrated charger belongs to a magnetic integration scheme, a vehicle-mounted charger and a vehicle-mounted DC/DC shared transformer, a partial power circuit, a water cooling plate, a shell and electrical connection are adopted, but the scheme has the problems of magnetic circuit coupling, mutual influence, inconvenience for platform and the like between the vehicle-mounted charger and the vehicle-mounted DC/DC shared transformer.

Disclosure of Invention

The invention aims to overcome the defects of low integration level, large assembly volume, high cost, mutual influence, inconvenience for platform and the like of an integration scheme aiming at a vehicle-mounted charger and a vehicle-mounted DC/DC in the prior art, and aims to provide an integrated circuit of the vehicle-mounted charger and the vehicle-mounted DC/DC and an electric automobile.

The invention solves the technical problems through the following technical scheme:

the invention provides a vehicle-mounted charger and a vehicle-mounted DC/DC integrated circuit, wherein the integrated circuit comprises a PFC (power factor correction) module, a high-voltage AC (alternating current) side power switch module, an AC voltage transformation module, a mode switching module, a high-voltage DC (direct current) side power switch module, a DC voltage transformation module, a low-voltage DC side power switch module and a main control module;

the PFC module, the high-voltage AC side power switch module and the AC transformation module are electrically connected in sequence, the low-voltage DC side power switch module is electrically connected with the DC transformation module, and the AC transformation module and the DC transformation module are electrically connected with the high-voltage DC side power switch module through the mode switching module; the mode switching module is electrically connected with the main control module, the PFC module is also electrically connected with an external power supply, the low-voltage DC side power switch module is also electrically connected with a low-voltage battery, and the high-voltage AC side power switch module is also electrically connected with a power battery;

the main control module is used for acquiring an external trigger condition, determining a working mode of the integrated circuit according to the external trigger condition, and controlling the mode switching module to switch the integrated circuit to the working mode;

when the working mode is a charging mode:

the high-voltage AC side power switch module is used for converting the input high-frequency alternating current into high-frequency alternating current and sending the high-frequency alternating current to the AC transformation module;

or, when the working mode is a discharging mode:

the high-voltage DC side power switch module is used for converting second direct current input by the power battery into high-frequency alternating current and sending the high-frequency alternating current to the AC transformation module through the mode switching module, the AC transformation module is used for carrying out electrical isolation and LL C (resonant current) conversion processing on the input high-frequency alternating current and sending the high-frequency alternating current to the high-voltage AC side power switch module, the high-voltage AC side power switch module is used for converting the input high-frequency alternating current into first direct current and sending the first direct current to the PFC module, and the PFC module is used for converting the input first direct current into alternating current to supply load work;

or, when the operating mode is a DC/DC operating mode:

the high-voltage DC side power switch module is used for converting second direct current input by the power battery into high-frequency alternating current and sending the high-frequency alternating current to the DC transformation module through the mode switching module, the DC transformation module is used for carrying out electrical isolation and LL C conversion processing on the input high-frequency alternating current and sending the high-frequency alternating current to the low-voltage DC side power switch module, the low-voltage DC side power switch module is used for converting the input high-frequency alternating current into direct current to charge the low-voltage battery, and at the moment, the low-voltage DC side power switch module is in a working state of synchronous rectification and filtering.

Preferably, the mode switching module is a switch.

Preferably, the change-over switch comprises a double-pole double-throw switch, a combination switch or a power device switch.

Preferably, the PFC module includes a first inductor, a first capacitor, a first power switching tube unit, a second power switching tube unit, a third power switching tube unit, and a fourth power switching tube unit;

one end of the first inductor is electrically connected with one end of the external power supply, and the other end of the first inductor is electrically connected with one end of the first power switch tube unit and one end of the third power switch tube unit respectively; one end of the second power switch tube unit and one end of the fourth power switch tube unit are both electrically connected with the other end of the external power supply;

the other end of the first power switch tube unit and the other end of the second power switch tube unit are electrically connected with one end of the first capacitor, the other end of the third power switch tube unit and the other end of the fourth power switch tube unit are electrically connected with the other end of the first capacitor, and the two ends of the first capacitor are electrically connected with the high-voltage AC side power switch module.

Preferably, the high-voltage AC-side power switch module includes a fifth power switch tube unit, a sixth power switch tube unit, a seventh power switch tube unit, and an eighth power switch tube unit;

one end of the fifth power switch tube unit and one end of the sixth power switch tube unit are both electrically connected with one end of the first capacitor, the other end of the fifth power switch tube unit is respectively electrically connected with one end of the seventh power switch tube unit and the transformer module, the other end of the sixth power switch tube unit is respectively electrically connected with one end of the eighth power switch tube unit and the transformer module, and the other end of the seventh power switch tube unit and the other end of the eighth power switch tube unit are both electrically connected with the other end of the first capacitor.

Preferably, the AC transforming module comprises a second inductor, a second capacitor, a third capacitor and a first transformer;

one end of the second capacitor is electrically connected with the other end of the fifth power switch tube unit, and the other end of the second capacitor is electrically connected with one end of the first coil winding in the first transformer;

one end of the second inductor is electrically connected with the other end of the sixth power switch tube unit, and the other end of the second inductor is electrically connected with the other end of the first coil winding;

one end of the third capacitor is electrically connected with one end of a second coil winding in the first transformer, and the other end of the third capacitor and the other end of the second coil winding are both electrically connected with the mode switching module.

Preferably, when the mode switching module is a double-pole double-throw switch, the mode switching module includes a first movable end, a second movable end, a first fixed end, a second fixed end, a third fixed end and a fourth fixed end;

the first movable end corresponds to the first fixed end and the second fixed end, and the second movable end corresponds to the third fixed end and the fourth fixed end;

the other end of the third capacitor is electrically connected with the first fixed end, and the other end of the second coil winding is electrically connected with the third fixed end;

the first active end and the second active end are both electrically connected with the high voltage DC side power switch module.

Preferably, the high-voltage DC side power switch module includes a fourth capacitor, a ninth power switch tube unit, a tenth power switch tube unit, an eleventh power switch tube unit, and a twelfth power switch tube unit;

one end of the ninth power switch tube unit and one end of the eleventh power switch tube unit are both electrically connected with the first movable end, and one end of the tenth power switch tube unit and one end of the twelfth power switch tube unit are both electrically connected with the second movable end;

the other end of the ninth power switch tube unit and the other end of the tenth power switch tube unit are both electrically connected with one end of the fourth capacitor and one end of the power battery, and the other end of the eleventh power switch tube unit and the other end of the twelfth power switch tube unit are both electrically connected with the other end of the fourth capacitor and the other end of the power battery.

Preferably, the DC transforming module includes a fifth capacitor, a third inductor and a second transformer;

one end of the fifth capacitor is electrically connected with the second fixed end, and the other end of the fifth capacitor is electrically connected with one end of a third coil winding in the second transformer;

one end of the third inductor is electrically connected with the fourth fixed end, and the other end of the third inductor is electrically connected with the other end of the third coil winding;

and a fourth coil winding in the second transformer is electrically connected with the low-voltage DC side power switch module.

Preferably, the fourth coil winding comprises a first sub-coil winding and a second sub-coil winding;

one end of the first sub-coil winding is electrically connected with one end of the second sub-coil winding;

the low-voltage DC side power switch module comprises a sixth capacitor, a fourth inductor, a diode, a thirteenth power switch tube unit and a fourteenth power switch tube unit;

one end of the thirteenth power switching tube unit is electrically connected with the other end of the first sub-coil winding, the other end of the thirteenth power switching tube unit is electrically connected with one end of the fourteenth power switching tube unit, one end of the fourth inductor and the cathode of the diode respectively, and the other end of the fourteenth power switching tube unit is electrically connected with the other end of the second sub-coil winding;

one end of the first sub-coil winding, the anode of the diode and one end of the sixth capacitor are electrically connected with one end of the low-voltage battery, and the other end of the sixth capacitor and the other end of the fourth inductor are electrically connected with the other end of the low-voltage battery.

Preferably, when the controller determines that the operation mode of the integrated circuit is a charging mode or a discharging mode:

the mode switching module is used for electrically connecting the first movable end with the first fixed end, and the second movable end is electrically connected with the third fixed end;

when the controller determines that the working mode of the integrated circuit is a DC/DC working mode, the mode switching module electrically connects the first movable end with the second fixed end, and the second movable end is electrically connected with the fourth fixed end.

Preferably, the first power switch tube unit to the fourteenth power switch tube unit each include one power switch tube, or a plurality of power switch tubes connected in series and/or in parallel.

Preferably, the power switch tube comprises a triode, a MOS (metal oxide semiconductor field effect transistor) tube or an IGBT (insulated gate bipolar transistor).

The invention also provides an electric automobile which comprises the vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

(1) the vehicle-mounted charger and the vehicle-mounted DC/DC have independent transformers, and a power circuit at the output side of the transformer of the vehicle-mounted charger and a power circuit at the input side of the vehicle-mounted DC/DC share the transformers, so that the total weight of the vehicle-mounted charger and the vehicle-mounted DC/DC is reduced, the size is reduced, the cost is reduced, the problem of magnetic coupling in a magnetic integration scheme is avoided, and the platformization of a product is easier to realize; in addition, the integration level of the circuit is improved, and meanwhile, the arrangement space of the whole vehicle is optimized integrally, so that the cost of the whole vehicle is reduced;

(2) by setting a mode switching module (such as a double-pole double-throw switch), the working mode of the integrated circuit is flexibly switched and selected according to the actual use requirement, and the arbitrary switching of three working modes, namely a charging mode, a discharging (inverting) mode and a DC/DC working mode, is conveniently realized.

Drawings

Fig. 1 is a schematic structural diagram of a vehicle-mounted charger and a vehicle-mounted DC/DC integrated circuit according to embodiment 1 of the present invention.

Fig. 2 is a schematic circuit diagram of a vehicle-mounted charger and a vehicle-mounted DC/DC integrated circuit according to embodiment 2 of the present invention.

Fig. 3 is a schematic circuit diagram of a charging mode of the vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit according to embodiment 2 of the present invention.

Fig. 4 is a schematic circuit diagram of the vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit of embodiment 2 of the present invention in a discharging mode.

Fig. 5 is a circuit schematic diagram of the vehicle-mounted charger and the vehicle-mounted DC/DC integrated circuit of embodiment 2 of the present invention in the DC/DC operating mode.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.