CN112583096A

CN112583096A - Vehicle-mounted charging system and vehicle with same

Info

Publication number: CN112583096A
Application number: CN201910936705.7A
Authority: CN
Inventors: 杨柳; 吴昊; 刘宇; 许兴发
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2021-03-30
Anticipated expiration: 2039-09-29
Also published as: WO2021057488A1; CN112583096B

Abstract

The invention discloses a vehicle-mounted charging system and a vehicle with the same, wherein the vehicle-mounted charging system comprises a first resonant circuit module, a second resonant circuit module, a gating circuit module and a control module, wherein the first resonant circuit module is used for converting an electric signal in a first half period of power supply; the second resonant circuit module is used for converting the electric signal of the second half period of power supply; the first resonant circuit module comprises a first transformer, the second resonant circuit module comprises a second transformer, and the first transformer and the second transformer share the same magnetic core; the gating circuit module is used for gating the first resonance circuit module or the second resonance circuit module; the control module is used for controlling the first resonant circuit module when the power is supplied for a first half period or controlling the second resonant circuit module when the power is supplied for a second half period. The system and the vehicle adopt a design without electrolytic capacitors, so that the cost can be reduced, and the stability can be improved.

Description

Vehicle-mounted charging system and vehicle with same

Technical Field

The invention relates to the technical field of vehicles, in particular to a vehicle-mounted charging system and a vehicle with the same.

Background

Fig. 1 is a circuit diagram of a vehicle charging system in the related art, which is connected to a power grid at one end and a battery pack at the other end, and includes a Part1 'and a Part 2' two-stage circuit. When the battery is charged in the forward direction, Part 1' realizes alternating current-direct current conversion and power factor correction, and outputs direct current voltage. Part 2' is a dc-dc converter that outputs the appropriate voltage to charge the battery pack. For the system, in order to provide stable input direct-current voltage for the later stage Part2 ', a large-capacity electrolytic capacitor C1 ' is needed between Part1 ' and Part2 ', so that the volume and the cost of the system are increased, and the electrolytic capacitor C1 ' has the problems of service life and shock resistance and is unfavorable for the reliability of the system.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an onboard charging system that does not require a large-capacity electrolytic capacitor, reduces the system size, reduces the cost, and improves the system stability.

The invention further provides a vehicle adopting the vehicle-mounted charging system.

In order to solve the above problem, an in-vehicle charging system according to an embodiment of a first aspect of the present invention includes: the first end of the first resonant circuit module is connected with the first end of the electric unit and is used for converting the electric signal of the first half period of power supply; the first end of the second resonant circuit module is connected with the second end of the electric unit and is used for converting the electric signal of the second half period of power supply; the first resonant circuit module comprises a first transformer, the second resonant circuit module comprises a second transformer, and the first transformer and the second transformer share the same magnetic core; the first end of the gating circuit module is connected with the first end of the electric unit, the second end of the gating circuit module is connected with the second end of the electric unit, the third end of the gating circuit module is connected with the second end of the first resonance circuit module, and the fourth end of the gating circuit module is connected with the second end of the second resonance circuit module, and the gating circuit module is used for controlling the second end of the first resonance circuit module to be connected with the second end of the electric unit when receiving a first gating control signal or controlling the second end of the second resonance circuit module to be connected with the first end of the electric unit when receiving a second gating control signal; and the control module is used for outputting the first gating control signal when the power is supplied for the first half period and controlling the first resonant circuit module according to the timing signal of the first half period of the power supply, or outputting the second gating control signal when the power is supplied for the second half period and controlling the second resonant circuit module according to the timing signal of the second half period of the power supply.

According to the vehicle-mounted charging system provided by the embodiment of the invention, the gating circuit module and the two resonant circuit modules are arranged, the control module controls the gating circuit module according to the power supply period signal to gate the first resonant circuit module or the second resonant circuit module, so that the signal output by the resonant circuit module is steamed bread wave, and therefore, a large-capacity electrolytic capacitor is not needed for filtering, so that the system adopts a design without an electrolytic capacitor, only a small-capacity capacitor such as a film capacitor is needed, the cost and the volume of the electrolytic capacitor part are reduced, and the reliability and the service life of the system are improved; and the first resonance circuit module and the second resonance circuit module share the same magnetic core, so that the use of the magnetic core can be reduced, the power density is improved, and the cost is reduced.

In order to solve the above problem, a vehicle according to an embodiment of a second aspect of the present invention includes a battery pack and the vehicle-mounted charging system.

According to the vehicle provided by the embodiment of the invention, the vehicle-mounted charging system provided by the embodiment of the invention is adopted, so that the cost can be reduced, the reliability can be improved, and the anti-seismic grade can be improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a circuit diagram of a bidirectional vehicle-mounted charger in the related art;

FIG. 2 is a functional block diagram of an in-vehicle charging system according to one embodiment of the present invention;

fig. 3 is a functional block diagram of an in-vehicle charging system according to another embodiment of the present invention;

fig. 4 is a circuit diagram of an in-vehicle charging system according to an embodiment of the invention;

fig. 5 is a circuit diagram of an in-vehicle charging system according to another embodiment of the invention;

FIG. 6 is a block diagram of a vehicle according to one embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

An in-vehicle charging system according to an embodiment of the invention is described below with reference to fig. 2 to 5.

Fig. 2 is a block diagram of an in-vehicle charging system according to an embodiment of the present invention, and as shown in fig. 2, the in-vehicle charging system 100 of the embodiment of the present invention includes a first resonant circuit module 10, a second resonant circuit module 20, a gate circuit module 30, and a control module 50.

The first resonant circuit module 10 is configured to perform conversion processing on an electrical signal of a first half cycle of power supply, and a first end of the first resonant circuit module 10 is connected to a first end of the electrical unit 60. The second resonant circuit module 20 is used for converting the electrical signal of the second half period of the power supply, and the first end of the second resonant circuit module 20 is connected to the second end of the electrical unit 60. In an embodiment, the electrical unit 60 may include a power grid, an electrical device, and the like.

The gate circuit module 30 is configured to, when receiving the first gate control signal, turn on a corresponding switching tube thereof, and control the second end of the first resonant circuit module 10 to be connected to the second end of the electrical unit 60, where the first resonant circuit module 10 is enabled, or, when receiving the second gate control signal, turn on a corresponding switching tube thereof, and control the second end of the second resonant circuit module 20 to be connected to the first end of the electrical unit 60, where the second resonant circuit module 20 is enabled. The first terminal of the gate circuit module 30 is connected to the first terminal of the electric unit 60, the second terminal of the gate circuit module 30 is connected to the second terminal of the electric unit 60, the third terminal of the gate circuit module 30 is connected to the second terminal of the first resonance circuit module 10, and the fourth terminal of the gate circuit module 30 is connected to the second terminal of the second resonance circuit module 20.

The first resonant circuit module 10 includes a first transformer T1, the second resonant circuit module 10 includes a second transformer T2, and the first transformer T1 and the second transformer T2 share the same magnetic core, i.e., the transformers are magnetically coupled, so that the use of the magnetic core is reduced, the power density is improved, and the cost can be saved.

The control module 50 is configured to output a first gate control signal during a first half period of the power supply and control the first resonant circuit module 10 according to a timing signal of the first half period of the power supply, or output a second gate control signal during a second half period of the power supply and control the second resonant circuit module 20 according to a timing signal of the second half period of the power supply.

Specifically, when charging is performed, the electrical unit 60 may be a power grid, the control module 50 detects period information of alternating current output by the power grid, and outputs a first gating control signal when a first half period of power supply, for example, a positive half period, is performed, the gating circuit module 30 receives the first gating control signal, and turns on a corresponding switching tube thereof, and controls the second end of the first resonant circuit module 10 to be connected with the second end of the power grid, at this time, power supply by the power grid is provided to the first resonant circuit module 10, the control module 50 controls the first resonant circuit module 10 according to a timing signal of the first half period of power supply, and the first resonant circuit module 10 converts an alternating current signal of the positive half period of the power grid into a direct current electrical signal, and inputs the direct current electrical signal to a rear-stage.

Similarly, when the control module 50 detects that the power supply has a second half period, for example, an electrical signal of a negative half period, the control module 50 outputs a second gating control signal, the gating circuit module 30 receives the second gating control signal, the corresponding switching tube of the second gating control signal is turned on, and controls the second end of the second resonant circuit module 20 to be connected to the first end of the power grid, at this time, the power grid supply is provided to the second resonant circuit module 10, the control module 50 controls the second resonant circuit module 20 according to the timing signal of the second half period of the power supply, and the second resonant circuit module 20 converts the ac signal of the negative half period of the power grid into a dc electrical signal, and inputs the dc electrical signal to the subsequent circuit, so.

In an embodiment, the gating circuit module 30 selects positive and negative periodic electrical signals of the power grid, the control module 50 controls the first resonant circuit module 10 to output a positive direct current electrical signal during a positive half period, and the control module 50 controls the second resonant circuit module 20 to output a positive direct current electrical signal during a negative half period, where the direct current electrical signals are all provided to a subsequent circuit, that is, the direct current electrical signals provided to the subsequent circuit are steamed bread wave signals.

According to the vehicle-mounted charging system 100 provided by the embodiment of the invention, the gating circuit module 30 is arranged, the gating of the resonant circuit module can be carried out according to the power supply period, the control module 50 controls the first resonant circuit module 10 and the second resonant circuit module 20 according to the time sequence of the corresponding power supply period respectively, so that the direct-current signal provided by the resonant circuit module to the rear-stage circuit is a steamed bread wave, a large-capacity electrolytic capacitor is not needed, the system volume and the cost can be reduced, an electrolytic capacitor-free design is adopted, the service life and the anti-seismic problem of the electrolytic capacitor are not needed to be considered, the stability of the charging system is favorably provided, and the first resonant circuit module 10 and the second resonant circuit module 20 share the same magnetic core, the space can be reduced, the power density is improved, and.

Further, as shown in fig. 3, which is a block diagram of an in-vehicle charging system according to another embodiment of the present invention, as shown in fig. 3, the in-vehicle charging system 100 further includes a dc conversion circuit module 40, and the dc conversion circuit module 40 is configured to perform dc conversion on an input electrical signal, for example, to reduce a dc voltage or to boost a dc voltage. In some embodiments, the dc conversion circuit module 40 may employ a BOOST circuit. A first end of the dc conversion circuit module 40 is connected to the first resonant circuit module 10 and the second resonant circuit module 20, respectively, and a second end of the dc conversion circuit module 40 is connected to the battery pack 70.

Specifically, during the first half cycle of power supply, the first resonant circuit module 10 outputs a dc signal to the dc conversion circuit module 40, or during the second half cycle of power supply, the second resonant circuit module 20 outputs a dc signal to the dc conversion circuit module 40, and the dc conversion circuit module 40 converts the input dc signal to convert the dc signal into an electrical signal required by the battery pack 70 and transmits the electrical signal to the battery pack 70, so as to charge the battery pack 70.

In the vehicle-mounted charging system 100 according to the embodiment of the present invention, the dc conversion circuit module 40 is disposed at the rear, so that the charging voltage or the charging power output to the battery pack 70 can be adjusted by controlling the duty ratio of the dc conversion circuit module 40, which can not only widen the voltage range of the battery pack 70, but also shorten the charging time of the battery pack 70 and the charging efficiency of the battery pack 70.

The circuit structure of each module according to the embodiment of the present invention is further described below with reference to the drawings.

In some embodiments, fig. 4 is a circuit diagram of an onboard charging system in which the electrical unit is a power grid, according to one embodiment of the present invention. As shown in fig. 4, the gating circuit module 30 includes a first switch Q1 and a second switch Q2. A first end of the first switching tube Q1 is connected to a first end of the electric unit 60, a second end of the first switching tube Q1 is connected to a second end of the first resonant circuit module 10, and a control end of the first switching tube Q1 is connected to the control module 50; a first terminal of a second switching tube Q2 is connected to the second terminal of the electrical unit 60, a second terminal of the second switching tube Q2 is connected to the second terminal of the second resonant circuit module 20, and a control terminal of the second switching tube Q2 is connected to the control module 50.

Specifically, the switching timing of the control module 50 for the gating circuit module 30 is that, during the positive half-cycle of the supply voltage, the first switching tube Q1 is turned on, and the second switching tube Q2 is turned off, so as to gate the first resonant circuit module 10; during the negative half-cycle of the supply voltage, the first switching transistor Q1 is turned off and the second switching transistor Q2 is turned on, gating the second resonant circuit module 20. Therefore, different resonant circuit modules are gated according to the power supply periodic signal, so that the voltage signals output by the resonant circuit modules are in the same direction, namely, the steamed bread wave information is output to the direct current conversion circuit module 40.

In an embodiment, the first resonant circuit module 10 and the second resonant circuit module 20 may employ a symmetrical half-bridge LLC resonant circuit to achieve isolation and voltage regulation, and perform ac-dc conversion on an input electrical signal.

As shown in fig. 4, the first resonant circuit module 10 includes a first capacitor C1, a third switch tube Q3, a fourth switch tube Q4, a second capacitor C2, a third capacitor C3, a first transformer T1, a fifth switch tube Q5, a sixth switch tube Q6, a fourth capacitor C4, and a fifth capacitor C5.

A first terminal of the first capacitor C1 is connected to the first terminal of the electrical unit 60, and a second terminal of the first capacitor C1 is connected to the second terminal of the first switch Q1. The first capacitor C1 can filter the input electrical signal to reduce the electrical signal interference.

A first terminal of a third switching tube Q3 is connected to a first terminal of a first capacitor C1, a control terminal of a third switching tube Q3 is connected to the control module 50, a second terminal of the third switching tube Q3 is connected to a first terminal of a fourth switching tube Q4, a second terminal of a fourth switching tube Q4 is connected to a second terminal of the first capacitor C1, a control terminal of the fourth switching tube Q4 is connected to the control module 50, and a first node O1 is located between the second terminal of the third switching tube Q3 and the first terminal of the fourth switching tube Q4. A first terminal of the second capacitor C2 is connected to the first terminal of the third switch Q3, a second terminal of the second capacitor C2 is connected to the first terminal of the third capacitor C3, a second terminal of the third capacitor C3 is connected to the second terminal of the fourth switch Q4, and a second node O2 is located between the second terminal of the second capacitor C2 and the first terminal of the third capacitor C3.

The first transformer T1 includes a first winding W1 and a second winding W2, a first terminal of the first winding W1 is connected to a first node O1 through a first inductance L1, and a second terminal of the first winding W1 is connected to a second node O2.

A first end of the fifth switching tube Q5 is connected to the first end of the dc conversion circuit module 40, a control end of the fifth switching tube Q5 is connected to the control module 50, a second end of the fifth switching tube Q5 is connected to the first end of the sixth switching tube Q6, a second end of the sixth switching tube Q6 is connected to the second end of the dc conversion circuit module 40, a control end of the sixth switching tube Q6 is connected to the control module 50, a third node O3 is provided between the second end of the fifth switching tube Q5 and the first end of the sixth switching tube Q6, and the third node O3 is connected to the first end of the second coil W2 through a second inductor. A first end of a fourth capacitor C4 is connected to the first end of the fifth switch tube Q5 and the first end of the dc conversion circuit module 40, a second end of the fourth capacitor C4 is connected to the first end of the fifth capacitor C5, a second end of the fifth capacitor C5 is connected to the first end of the sixth switch tube Q6 and the second end of the dc conversion circuit module 40, a fourth node O4 is provided between the second end of the fourth capacitor C4 and the first end of the fifth capacitor C5, and the fourth node O4 is connected to the second end of the second coil W2. The fifth switch tube Q5, the sixth switch tube Q6, the fourth capacitor C4 and the fifth capacitor C5 form a rectifier circuit structure.

Specifically, when the grid voltage is a positive half-cycle during charging of the battery pack 70, the first switching tube Q1 is turned on, the second switching tube Q2 is turned off, and the first resonant circuit module 10 is gated; the grid voltage is applied to the first capacitor C1, the control module 50 turns on and off the third switching tube Q3 and the fourth switching tube Q4 at a fixed frequency and a fixed duty ratio, and the second capacitor C2 and the third capacitor C3 are charged and discharged, so that an alternating voltage is formed between a first node O1, which is a midpoint of the third switching tube Q3 and the fourth switching tube Q4, and a second node O2, which is a midpoint of the second capacitor C2 and the third capacitor C3. After being isolated by the first transformer T1, the rectifying circuit composed of the fifth switching tube Q5, the sixth switching tube Q6, the fourth capacitor C4 and the fifth capacitor C5 converts the ac voltage between the midpoint of the fifth switching tube Q5 and the sixth switching tube Q6, i.e., the third node O3, and the midpoint of the fourth capacitor C4 and the fifth capacitor C5, i.e., the fourth node O4, into the dc voltage to be output, i.e., the voltage to be supplied to the dc conversion circuit module 40, by controlling the on/off of the fifth switching tube Q5 and the sixth switching tube Q6, and charging and discharging the fourth capacitor C4 and the fifth capacitor C5, thereby implementing ac-dc conversion.

As shown in fig. 4, the dc conversion circuit module 40 includes a sixth capacitor C6, a seventh switch Q7, an eighth switch Q8, and a seventh capacitor C7.

A first end of the sixth capacitor C6 is connected to a first end of the fifth switching tube Q5 and a first end of the fourth capacitor C4, respectively, and a second end of the sixth capacitor C6 is connected to a second end of the sixth switching tube Q6 and a second end of the fifth capacitor C5, respectively; the sixth capacitor C6 is used to filter the input dc signal, and in the embodiment of the present invention, the sixth capacitor C6 is a capacitor device with a small capacitance, such as a thin film capacitor, and an electrolytic capacitor with a large capacitance is not needed.

A first end of a seventh switching tube Q7 is connected to the first end of the battery pack 70, a control end of the seventh switching tube Q7 is connected to the control module 50, a second end of the seventh switching tube Q7 is connected to the first end of an eighth switching tube Q8, a second end of the eighth switching tube Q8 is connected to the second end of the sixth capacitor C6 and the second end of the battery pack 70, respectively, a control end of an eighth switching tube Q8 is connected to the control module 50, a fifth node O5 is located between the second end of the seventh switching tube Q7 and the first end of the eighth switching tube Q8, and the fifth node O5 is connected to the first end of the sixth capacitor C6 through a third inductor L3; a first terminal of the seventh capacitor C7 is connected to the first terminal of the seventh switch tube Q7 and the first terminal of the battery pack 70, respectively, and a second terminal of the seventh capacitor C7 is connected to the second terminal of the eighth switch tube Q8 and the second terminal of the battery pack 70, respectively.

As shown in fig. 4, the second resonant circuit module 20 includes an eighth capacitor C8, a ninth switch Q9, a tenth switch Q10, a ninth capacitor C9, a tenth capacitor C10, a second transformer T2, an eleventh switch Q11, a twelfth switch Q12, an eleventh capacitor C11, and a twelfth capacitor C12. The second transformer T2 and the first transformer T1 share the same magnetic core, so that the cost is reduced.

A first terminal of the eighth capacitor C8 is connected to the second terminal of the electrical unit 60, and a second terminal of the eighth capacitor C8 is connected to the second terminal of the second switch Q2.

A first end of the ninth switching tube Q9 is connected to a first end of the eighth capacitor C8, a control end of the ninth switching tube Q9 is connected to the control module 50, a second end of the ninth switching tube Q9 is connected to a first end of the tenth switching tube Q10, a second end of the tenth switching tube Q10 is connected to a second end of the eighth capacitor C8, a control end of the tenth switching tube Q10 is connected to the control module 50, and a sixth node O6 is provided between the second end of the ninth switching tube Q9 and the first end of the tenth switching tube Q10.

A first terminal of the ninth capacitor C9 is connected to the first terminal of the ninth switch transistor Q9, a second terminal of the ninth capacitor C9 is connected to the first terminal of the tenth capacitor C10, a second terminal of the tenth capacitor C10 is connected to the second terminal of the tenth switch transistor Q10, and a seventh node O7 is located between the second terminal of the ninth capacitor C9 and the first terminal of the tenth capacitor C10.

The second transformer T2 includes a third coil W3 and a fourth coil T4, a first terminal of the third coil T3 is connected to the sixth node O4 through a fourth inductor L4, and a second terminal of the third coil W3 is connected to the seventh node O7.

A first end of the eleventh switch tube Q10 is connected to a first end of a sixth capacitor C6, a control end of the eleventh switch tube Q11 is connected to the control module 50, a second end of the eleventh switch tube Q11 is connected to a first end of a twelfth switch tube Q12, a second end of the twelfth switch tube Q12 is connected to a second end of a sixth capacitor C6, a control end of the twelfth switch tube Q12 is connected to the control module 50, an eighth node O8 is located between the second end of the eleventh switch tube Q11 and the first end of the twelfth switch tube Q12, and the eighth node O8 is connected to a first end of a fourth coil W4 through a fifth inductor L5.

A first end of an eleventh capacitor C11 is connected to a first end of the eleventh switch Q11 and a first end of a sixth capacitor C6, respectively, a second end of the eleventh capacitor C11 is connected to a first end of a twelfth capacitor C12, a second end of the twelfth capacitor C12 is connected to a second end of the twelfth switch Q12 and a second end of the sixth capacitor C6, respectively, a ninth node O9 is provided between the second end of the eleventh capacitor C11 and the first end of the twelfth capacitor C12, and the ninth node O9 is connected to the second end of the fourth coil W4.

Specifically, when the grid voltage is a negative half-cycle during charging of the battery pack 70, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, and the second resonant circuit module 20 is gated; the grid voltage is applied to the eighth capacitor C8, and the control module 50 controls the ninth switch Q9 and the tenth switch Q10 to be turned on or off at a fixed frequency and a fixed duty ratio, and charges and discharges the ninth capacitor C9 and the tenth capacitor C10, so that an alternating voltage is formed between a midpoint of the ninth switch Q9 and the tenth switch Q10, i.e., the sixth node O6, and a midpoint of the ninth capacitor C9 and the tenth capacitor C10, i.e., the seventh node O7. After being isolated by the second transformer T2, the eleventh switch tube Q11, the twelfth switch tube Q12, the eleventh capacitor C11 and the twelfth capacitor C12 form a rectification circuit, the control module 50 charges and discharges the eleventh capacitor C11 and the twelfth capacitor C12 by controlling on/off of the eleventh switch tube Q11 and the twelfth switch tube Q12, and converts alternating current voltage between a midpoint of the eleventh switch tube Q11 and the twelfth switch tube Q12, i.e., an eighth node O8, and a midpoint of the eleventh capacitor C11 and the twelfth capacitor C12, i.e., a ninth node O9, into direct current voltage to be output, i.e., voltages at two ends of the sixth capacitor C6, so as to implement alternating current-direct current conversion.

The voltage on the sixth capacitor C6 is proportional to the absolute value of the grid voltage, and since the voltage waveforms output by the first resonant circuit module 10 and the second resonant circuit module 20 are the bread waves, a large-capacity electrolytic capacitor is not needed for filtering, so that a small-capacity capacitor, such as a film capacitor, can be selected for the C6.

Further, the dc conversion circuit module 40 regulates the input dc voltage to supply to the battery pack 70. Specifically, when the eighth switch Q8 is turned on, the current of the third inductor L3 increases, and as shown in fig. 4, the current flows in a → L3 → Q8 → B; the eighth switch tube Q8 is turned off, the current of the third inductor L3 decreases, and the current flows in a → L3 → Q7 → battery pack → B as shown in fig. 4. The control module 50 performs high-frequency on/off control on the eighth switching tube Q8, so that the current waveform of the third inductor L3 tracks the voltage of the sixth capacitor C6, power factor correction can be achieved, and the current amplitude of the third inductor L3 depends on the charging power.

Based on the circuit structure of the vehicle-mounted charging system 10 shown in fig. 4, the vehicle-mounted charging system can also operate in a discharging mode, that is, the battery pack 70 is discharged to supply power to the electric equipment, and the specific process is as follows.

When the vehicle-mounted charging system 10 works in a discharging mode, the battery pack 70 discharges and outputs direct current, the direct current conversion circuit module 40 performs direct current-direct current conversion to realize a voltage regulation function, and the control module 50 controls two switching tubes in the gating circuit module 30 to gate according to the power supply period signal so as to gate the first resonance circuit module 10 or the second resonance circuit module 20 and output power frequency alternating current to supply power for the electric equipment or feed back to a power grid.

Referring to fig. 4, specifically, the switching timing of the dc conversion circuit module 40 is: when the seventh switching tube Q7 is turned on, the current of the third inductor L3 rises, and the battery pack 70 transfers energy to the rear-stage circuit; when the seventh switch Q7 is turned off, the current of the third inductor L3 drops, and then flows through the eighth switch Q8, and transfers energy to the subsequent stage. The control module 50 regulates the output voltage, i.e., the voltage across the sixth capacitor C6, by controlling the seventh switch Q7 to turn on and off, and the voltage amplitude depends on the switching duty ratio of the seventh switch Q7 and the voltage of the battery pack 70.

For the first resonant circuit module 10 and the second resonant circuit module 20, the first resonant circuit module 10 is gated on outputting a positive half cycle of the alternating current. Specifically, the fifth switch Q5 and the sixth switch Q6 are turned on or off at a fixed frequency and a fixed duty ratio, and the fourth capacitor C4 and the fifth capacitor C5 are charged and discharged, so that an alternating voltage is formed between a midpoint of the fifth switch Q5 and the sixth switch Q6, i.e., the third node O3, and a midpoint of the fourth capacitor C4 and the fifth capacitor C5, i.e., the fourth node O4. After the isolation of the first transformer T1, the third switching tube Q3, the fourth switching tube Q4, the second capacitor C2 and the third capacitor C3 realize a rectification function, and through the on/off of the third switching tube Q3 and the fourth switching tube Q4 and the charging and discharging of the second capacitor C2 and the third capacitor C3, the alternating current voltage between the middle points of the third switching tube Q3 and the fourth switching tube Q4, i.e., the first node O1 and the second capacitor C2, and the middle point of the third capacitor C3, i.e., the second node O2, is converted into a positive half-cycle part of the power frequency, i.e., the voltage at two ends of the first capacitor C1, so that the positive half-cycle part output of the power frequency alternating current is realized.

Likewise, the second resonant circuit module 20 is gated on the negative half-cycle of the alternating current output by the system. The eleventh switch tube Q11 and the twelfth switch tube Q12 are turned on or off at a fixed frequency and a fixed duty ratio, and the eleventh capacitor C11 and the twelfth capacitor C12 are charged and discharged, so that an alternating voltage is formed between a midpoint of the eleventh switch tube Q11 and the twelfth switch tube Q12, i.e., the eighth node O8, and a midpoint of the eleventh capacitor C11 and the twelfth capacitor C12, i.e., the ninth node O9. After the transformation and isolation of the second transformer T2, the ninth switching tube Q9, the tenth switching tube Q10, the ninth capacitor C9 and the tenth capacitor C10 realize a rectification function, and through the conduction or the disconnection of the ninth switching tube Q9 and the tenth switching tube Q10 and the charging and the discharging of the ninth capacitor C9 and the eleventh capacitor C10, the alternating current voltage between the midpoint of the ninth switching tube Q9 and the tenth switching tube Q10, i.e., the seventh node O7, and the midpoint of the ninth capacitor C9 and the tenth capacitor C10, i.e., the sixth node O6, is converted into the negative half-cycle of the power frequency alternating current, i.e., the voltage at two ends of the eighth capacitor C8, so as to realize the negative half-cycle output of the power frequency alternating current.

The switching timing for the gating circuit module 30 is: when the system outputs a positive half-cycle signal of alternating current, the first switching tube Q1 is switched on, the second switching tube Q2 is switched off, and the first resonant circuit module 10 is switched on; when the system outputs a signal of a negative half cycle of the alternating current, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, and the second resonant circuit module 20 is gated.

The bidirectional charging circuit structure of the vehicle-mounted charging system 100 of the embodiment of the present invention is described above, and in some embodiments, the vehicle-mounted charging system 100 of the embodiment of the present invention further includes a unidirectional charging circuit structure.

Fig. 5 is a circuit diagram of an in-vehicle charging system according to an embodiment of the present invention, and an in-vehicle charging system 100 according to an embodiment of the present invention will be described below with reference to fig. 5.

As shown in fig. 5, the first resonant circuit module 10 includes a thirteenth capacitor C13, a thirteenth switch Q13, a fourteenth switch Q14, a fourteenth capacitor C14, a fifteenth capacitor C15, a first transformer T1, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4.

Wherein a first terminal of the thirteenth capacitor C13 is connected to the first terminal of the electrical unit 60, e.g. the grid, and a second terminal of the thirteenth capacitor C13 is connected to the second terminal of the first switching tube Q1. The thirteenth capacitor C13 is used to filter the electrical signal from the grid input to reduce interference.

A first end of a thirteenth switching tube Q13 is connected to a first end of a thirteenth capacitor C13, a control end of a thirteenth switching tube Q13 is connected to the control module 50, a second end of the thirteenth switching tube Q13 is connected to a first end of a fourteenth switching tube Q14, a second end of a fourteenth switching tube Q14 is connected to a second end of a thirteenth capacitor C13, a control end of a fourteenth switching tube Q14 is connected to the control module 50, and a tenth node O10 is located between the second end of the thirteenth switching tube Q13 and the first end of the fourteenth switching tube Q14; a first terminal of the fourteenth capacitor C14 is connected to the first terminal of the thirteenth switching transistor Q13, a second terminal of the fourteenth capacitor C14 is connected to the first terminal of the fifteenth capacitor C15, a second terminal of the fifteenth capacitor C15 is connected to the second terminal of the fourteenth switching transistor Q14, and an eleventh node O11 is located between the second terminal of the fourteenth capacitor C14 and the first terminal of the fifteenth capacitor C15.

The first transformer T1 includes a first winding W1 and a second winding W2, a first end of the first winding W1 is connected to a tenth node O10 through a sixth inductance L6, and a second end of the first winding W1 is connected to an eleventh node O11. The first transformer T1 realizes transformation and isolation.

A first terminal of the first diode D1 is connected to the first terminal of the dc conversion circuit module 40, a second terminal of the first diode D1 is connected to the first terminal of the second diode D2, a second terminal of the second diode D2 is connected to the second terminal of the dc conversion circuit module 40, a twelfth node O12 is provided between the second terminal of the first diode D1 and the first terminal of the second diode D2, and the twelfth node O12 is connected to the first terminal of the second coil W2. A first terminal of the third diode D3 is connected to the first terminal of the dc conversion circuit block 40, a second terminal of the third diode D3 is connected to the first terminal of the fourth diode D4, a second terminal of the fourth diode D4 is connected to the second terminal of the dc conversion circuit block 40, a thirteenth node O13 is provided between the second terminal of the third diode D3 and the first terminal of the fourth diode D4, and the thirteenth node O13 is connected to the second terminal of the second coil W2. The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form a rectifying circuit.

Specifically, when the grid voltage is a positive half-cycle during charging of the battery pack 70, the first switching tube Q1 is turned on, and the second switching tube Q2 is turned off, so as to gate the first resonant circuit module 10. The grid voltage is applied to the thirteenth capacitor C13, the thirteenth switching tube Q13 and the fourteenth switching tube Q14 are turned on or off at a fixed frequency and a fixed duty cycle by the control module 50, the fourteenth capacitor C14 and the fifteenth capacitor C15 are charged and discharged, and an alternating voltage is formed between a tenth node O10, which is a midpoint of the thirteenth switching tube Q13 and the fourteenth switching tube Q14, and an eleventh node O11, which is a midpoint of the fourteenth capacitor C14 and the fifteenth capacitor C15. After being isolated by the first transformer T1, the voltage is provided to a rectifying circuit composed of a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, and the alternating current voltage is rectified to form direct current voltage, that is, the direct current voltage is provided to the direct current conversion circuit module 40, so that alternating current-direct current conversion is realized.

As shown in fig. 5, the dc conversion circuit module 40 includes a sixteenth capacitor C16, a fifth diode D5, a fifteenth switch tube Q15, and a seventeenth capacitor C17.

A first end of the sixteenth capacitor C16 is connected to the first end of the first diode D1 and the first end of the third diode D3, respectively, and a second end of the sixteenth capacitor C16 is connected to the second end of the second diode D2 and the second end of the fourth diode D4, respectively. The sixteenth capacitor C16 is used to filter the input electrical signal.

A first end of the fifth diode D5 is connected to the first end of the battery pack 70, a second end of the fifth diode D5 is connected to a first end of a fifteenth switching tube Q15, a second end of the fifteenth switching tube Q15 is connected to a second end of a sixteenth capacitor C16 and a second end of the battery pack 70, a control end of the fifteenth switching tube Q15 is connected to the control module 50, a fourteenth node O14 is located between the second end of the fifth diode D5 and the first end of the fifteenth switching tube Q15, and the fourteenth node Q14 is connected to the first end of the sixteenth capacitor C16 through a seventh inductor L7.

A first terminal of a seventeenth capacitor C17 is connected to the first terminal of the fifth diode D5 and the first terminal of the battery pack 70, respectively, and a second terminal of the seventeenth capacitor C17 is connected to the second terminal of the fifteenth switch tube Q15 and the second terminal of the battery pack 70, respectively.

As shown in fig. 5, the second resonant circuit module 20 includes an eighteenth capacitor C18, a sixteenth switch Q16, a seventeenth switch Q17, a nineteenth capacitor C19, a twentieth capacitor C20, a second transformer T2, a sixth diode D6, a seventh diode D7, an eighth diode D8, and a ninth diode D9, and the second transformer T2 and the first transformer T1 share the same magnetic core, so as to reduce the usage of the magnetic core and reduce the cost.

A first terminal of the eighteenth capacitor C18 is connected to the second terminal of the electrical unit 60, for example, the power grid, and a second terminal of the eighteenth capacitor C18 is connected to the second terminal of the second switching tube Q2. The eighteenth capacitor C18 is used for filtering the electric signal input by the power grid to reduce interference.

A first end of a sixteenth switching tube Q16 is connected to a first end of an eighteenth capacitor C18, a control end of the sixteenth switching tube Q16 is connected to the control module 50, a second end of the sixteenth switching tube Q16 is connected to a first end of a seventeenth switching tube Q17, a second end of the seventeenth switching tube Q17 is connected to a second end of the eighteenth capacitor C18, a control end of the seventeenth switching tube Q17 is connected to the control module 50, and a fifteenth node O15 is provided between the second end of the sixteenth switching tube Q16 and the first end of the seventeenth switching tube Q17.

A first end of the nineteenth capacitor C19 is connected to the first end of the sixteenth switching tube Q16, a second end of the nineteenth capacitor C19 is connected to the first end of the twentieth capacitor C20, a second end of the twentieth capacitor C20 is connected to the second end of the seventeenth switching tube Q17, and a sixteenth node O16 is provided between the second end of the nineteenth capacitor C19 and the first end of the twentieth capacitor C20.

The second transformer T2 includes a third coil W3 and a fourth coil W4, a first end of the third coil W3 is connected to a fifteenth node O15 through an eighth inductor L8, and a second end of the third coil W3 is connected to a sixteenth node O16.

A first terminal of the sixth diode D6 is connected to the first terminal of the sixteenth capacitor C16, a second terminal of the sixth diode D6 is connected to the first terminal of the seventh diode D7, a second terminal of the seventh diode D7 is connected to the second terminal of the sixteenth capacitor C16, a seventeenth node O17 is provided between the second terminal of the sixth diode D6 and the first terminal of the seventh diode D7, and a seventeenth node O17 is connected to the first terminal of the fourth coil W4. A first terminal of the eighth diode D8 is connected to a first terminal of the sixth diode D6 and a first terminal of the sixteenth capacitor C16, respectively, a second terminal of the eighth diode D8 is connected to a first terminal of the ninth diode D9, a second terminal of the ninth diode D9 is connected to a second terminal of the seventh diode D7 and a second terminal of the sixteenth capacitor C16, respectively, an eighteenth node O18 is provided between the second terminal of the eighth diode D8 and the first terminal of the ninth diode D9, and the eighteenth node O18 is connected to the second terminal of the fourth coil W4. The sixth diode D6, the seventh diode D7, the eighth diode D8 and the ninth diode D9 form a rectifying circuit.

Specifically, when the grid voltage is a negative half-cycle during charging of the battery pack 70, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, and the second resonant circuit module 20 is turned on. Specifically, the grid voltage is applied to the eighteenth capacitor C18, the control module 50 controls the sixteenth switch Q16 and the seventeenth switch Q17 to be turned on or off at a fixed frequency and a fixed duty ratio, and charges or discharges the nineteenth capacitor C19 and the twentieth capacitor C20, so that an alternating voltage is formed between a fifteenth node O15, which is a midpoint of the sixteenth switch Q16 and the seventeenth switch Q17, and a sixteenth node O16, which is a midpoint of the nineteenth capacitor C19 and the twentieth capacitor C20. After being isolated by the second transformer T2, the voltage is provided to a rectifying circuit consisting of a sixth diode D6, a seventh diode D7, an eighth diode D8 and a ninth diode D9 at the subsequent stage, and the rectifying circuit rectifies the input alternating current voltage into direct current voltage, namely, the voltage at two ends of a sixteenth capacitor C16, so that alternating current-direct current conversion is realized.

The voltage of the sixteenth capacitor C16 is proportional to the absolute value of the grid voltage, and since the voltage waveform output by the first resonant circuit module 10 and the second resonant circuit module 20 is the bread wave, a large-capacity electrolytic capacitor is not needed for filtering, so that a small-capacity capacitor, such as a film capacitor, can be selected for the C16.

Further, the dc conversion circuit module 40 regulates the input dc voltage to supply to the battery pack 70. Specifically, when the fifteenth switching tube Q15 is turned on, the current of the seventh inductor L7 increases, and as shown in fig. 5, the current flows in a → L7 → Q15 → B; when the fifteenth switch Q15 is turned off, the current of the seventh inductor L7 decreases, and the current flows in a → L7 → D5 → battery pack → B as shown in fig. 3. The fifteenth switch tube Q15 is controlled by the control module 50 to switch on and off at a high frequency, so that the current waveform of the seventh inductor L7 tracks the voltage of the sixteenth capacitor C16, thereby achieving power factor correction, and the current amplitude of the seventh inductor L7 depends on the charging power.

In the embodiment of the present invention, the switching tube may be a MOS tube or a triode or other suitable switching device.

In addition, for the Part of Part 2' in fig. 1, which is an LLC topology, when the output voltage range is wide, the switching frequency deviates from the resonant frequency more, resulting in low charging efficiency. The vehicle-mounted charging system 100 according to the embodiment of the invention can adjust the duty ratio of the operation of the dc conversion circuit module 40 at the rear stage through the control module 50 to control the charging power, and the adaptable battery voltage range is wider.

In summary, in the vehicle-mounted charging system 100 according to the embodiment of the present invention, the gating circuit module 30 and the two resonant circuit modules are arranged, and the control module 50 controls the gating circuit module 30 according to the power supply cycle signal to gate the first resonant circuit module 10 or the second resonant circuit module 20, so that the signal output by the resonant circuit module to the conversion circuit module is a steamed bread wave, and therefore, a large-capacity electrolytic capacitor is not required for filtering. The first resonant circuit module 10 and the second resonant circuit module 20 share the same magnetic core, so that the use of the magnetic core can be reduced, and the cost is reduced; and, through the duty cycle adjustment to dc conversion circuit module 40, can adapt to bigger battery voltage range, improve the efficiency of charging to battery package 40.

Based on the on-vehicle charging system of the above embodiment, a vehicle according to an embodiment of the second aspect of the invention is described below with reference to the drawings.

FIG. 6 is a block diagram of a vehicle according to one embodiment of the present invention. As shown in fig. 6, a vehicle 1000 according to an embodiment of the present invention includes a battery pack 70 and the vehicle-mounted charging system 100 according to the above embodiment, wherein the composition of the vehicle-mounted charging system 100 may refer to the description of the above embodiment, and of course, the vehicle 1000 further includes other systems, such as a transmission system, a power system, a steering system, and the like, which are not listed here.

According to the vehicle 1000 of the embodiment of the invention, by adopting the vehicle-mounted charging system 100 of the embodiment, the cost can be reduced, the reliability can be improved, and the anti-seismic grade can be improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An in-vehicle charging system, characterized by comprising:

the first end of the first resonant circuit module is connected with the first end of the electric unit and is used for converting the electric signal of the first half period of power supply;

the first end of the second resonant circuit module is connected with the second end of the electric unit and is used for converting the electric signal of the second half period of power supply;

the first resonant circuit module comprises a first transformer, the second resonant circuit module comprises a second transformer, and the first transformer and the second transformer share the same magnetic core;

the first end of the gating circuit module is connected with the first end of the electric unit, the second end of the gating circuit module is connected with the second end of the electric unit, the third end of the gating circuit module is connected with the second end of the first resonance circuit module, and the fourth end of the gating circuit module is connected with the second end of the second resonance circuit module, and the gating circuit module is used for controlling the second end of the first resonance circuit module to be connected with the second end of the electric unit when receiving a first gating control signal or controlling the second end of the second resonance circuit module to be connected with the first end of the electric unit when receiving a second gating control signal;

and the control module is used for outputting the first gating control signal when the power is supplied for the first half period and controlling the first resonant circuit module according to the timing signal of the first half period of the power supply, or outputting the second gating control signal when the power is supplied for the second half period and controlling the second resonant circuit module according to the timing signal of the second half period of the power supply.

2. The vehicle-mounted charging system according to claim 1, further comprising:

and the first end of the direct current conversion circuit module is respectively connected with the first resonance circuit module and the second resonance circuit module, and the second end of the direct current conversion circuit module is connected with the battery pack and used for performing direct current-direct current conversion on an input electric signal.

3. The vehicle charging system according to claim 1 or 2, wherein the gate circuit module includes:

a first end of the first switching tube is connected with a second end of the electric unit, a second end of the first switching tube is connected with a second end of the first resonant circuit module, and a control end of the first switching tube is connected with the control module;

and the first end of the second switch tube is connected with the first end of the electric unit, the second end of the second switch tube is connected with the second end of the second resonance circuit module, and the control end of the second switch tube is connected with the control module.

4. The vehicle charging system of claim 3, wherein the first resonant circuit module comprises:

a first end of the first capacitor is connected with a first end of the electric unit, and a second end of the first capacitor is connected with a second end of the first switch tube;

the first end of the third switch tube is connected with the first end of the first capacitor, the control end of the third switch tube is connected with the control module, the second end of the third switch tube is connected with the first end of the fourth switch tube, the second end of the fourth switch tube is connected with the second end of the first capacitor, the control end of the fourth switch tube is connected with the control module, and a first node is arranged between the second end of the third switch tube and the first end of the fourth switch tube;

a first end of the second capacitor is connected with a first end of the third switching tube, a second end of the second capacitor is connected with a first end of the third capacitor, a second end of the third capacitor is connected with a second end of the fourth switching tube, and a second node is arranged between the second end of the second capacitor and the first end of the third capacitor;

the first transformer comprises a first coil and a second coil, a first end of the first coil is connected with the first node through a first inductor, and a second end of the first coil is connected with the second node;

a fifth switching tube and a sixth switching tube, wherein a first end of the fifth switching tube is connected with a first end of the dc conversion circuit module, a control end of the fifth switching tube is connected with the control module, a second end of the fifth switching tube is connected with a first end of the sixth switching tube, a second end of the sixth switching tube is connected with a second end of the dc conversion circuit module, a control end of the sixth switching tube is connected with the control module, a third node is arranged between the second end of the fifth switching tube and the first end of the sixth switching tube, and the third node is connected with the first end of the second coil through a second inductor;

the first end of the fourth capacitor is connected with the first end of the fifth switching tube and the first end of the direct current conversion circuit module respectively, the second end of the fourth capacitor is connected with the first end of the fifth capacitor, the second end of the fifth capacitor is connected with the first end of the sixth switching tube and the second end of the direct current conversion circuit module respectively, a fourth node is arranged between the second end of the fourth capacitor and the first end of the fifth capacitor, and the fourth node is connected with the second end of the second coil.

5. The vehicle-mounted charging system according to claim 4, wherein the direct-current conversion circuit module includes:

a first end of the sixth capacitor is connected with a first end of the fifth switching tube and a first end of the fourth capacitor respectively, and a second end of the sixth capacitor is connected with a second end of the sixth switching tube and a second end of the fifth capacitor respectively;

a seventh switching tube and an eighth switching tube, wherein a first end of the seventh switching tube is connected to the first end of the battery pack, a control end of the seventh switching tube is connected to the control module, a second end of the seventh switching tube is connected to the first end of the eighth switching tube, a second end of the eighth switching tube is connected to the second end of the sixth capacitor and the second end of the battery pack, respectively, a control end of the eighth switching tube is connected to the control module, a fifth node is arranged between the second end of the seventh switching tube and the first end of the eighth switching tube, and the fifth node is connected to the first end of the sixth capacitor through a third inductor;

and a first end of the seventh capacitor is connected with the first end of the seventh switch tube and the first end of the battery pack respectively, and a second end of the seventh capacitor is connected with the second end of the eighth switch tube and the second end of the battery pack respectively.

6. The vehicle charging system according to claim 5, wherein the second resonance circuit module includes:

a first end of the eighth capacitor is connected with the second end of the electric unit, and a second end of the eighth capacitor is connected with the second end of the second switch tube;

a ninth switching tube and a tenth switching tube, wherein a first end of the ninth switching tube is connected with a first end of the eighth capacitor, a control end of the ninth switching tube is connected with the control module, a second end of the ninth switching tube is connected with a first end of the tenth switching tube, a second end of the tenth switching tube is connected with a second end of the eighth capacitor, a control end of the tenth switching tube is connected with the control module, and a sixth node is arranged between the second end of the ninth switching tube and the first end of the tenth switching tube;

a ninth capacitor and a tenth capacitor, wherein a first end of the ninth capacitor is connected to the first end of the ninth switching tube, a second end of the ninth capacitor is connected to the first end of the tenth capacitor, a second end of the tenth capacitor is connected to the second end of the tenth switching tube, and a seventh node is arranged between the second end of the ninth capacitor and the first end of the tenth capacitor;

the second transformer comprises a third coil and a fourth coil, a first end of the third coil is connected with the sixth node through a fourth inductor, and a second end of the third coil is connected with the seventh node;

the first end of the eleventh switch tube is connected with the first end of the sixth capacitor, the control end of the eleventh switch tube is connected with the control module, the second end of the eleventh switch tube is connected with the first end of the twelfth switch tube, the second end of the twelfth switch tube is connected with the second end of the sixth capacitor, the control end of the twelfth switch tube is connected with the control module, an eighth node is arranged between the second end of the eleventh switch tube and the first end of the twelfth switch tube, and the eighth node is connected with the first end of the fourth coil through a fifth inductor;

the first end of the eleventh capacitor is connected with the first end of the eleventh switching tube and the first end of the sixth capacitor respectively, the second end of the eleventh capacitor is connected with the first end of the twelfth capacitor, the second end of the twelfth capacitor is connected with the second end of the twelfth switching tube and the second end of the sixth capacitor respectively, a ninth node is arranged between the second end of the eleventh capacitor and the first end of the twelfth capacitor, and the ninth node is connected with the second end of the fourth coil.

7. The vehicle charging system of claim 3, wherein the first resonant circuit module comprises:

a thirteenth capacitor, wherein a first end of the thirteenth capacitor is connected to the first end of the electrical unit, and a second end of the thirteenth capacitor is connected to the second end of the first switch tube;

a thirteenth switching tube and a fourteenth switching tube, wherein a first end of the thirteenth switching tube is connected to a first end of the thirteenth capacitor, a control end of the thirteenth switching tube is connected to the control module, a second end of the thirteenth switching tube is connected to a first end of the fourteenth switching tube, a second end of the fourteenth switching tube is connected to a second end of the thirteenth capacitor, a control end of the fourteenth switching tube is connected to the control module, and a tenth node is arranged between the second end of the thirteenth switching tube and the first end of the fourteenth switching tube;

a fourteenth capacitor and a fifteenth capacitor, wherein a first end of the fourteenth capacitor is connected to the first end of the thirteenth switching tube, a second end of the fourteenth capacitor is connected to the first end of the fifteenth capacitor, a second end of the fifteenth capacitor is connected to the second end of the fourteenth switching tube, and an eleventh node is arranged between the second end of the fourteenth capacitor and the first end of the fifteenth capacitor;

the first transformer comprises a first coil and a second coil, a first end of the first coil is connected with the tenth node through a sixth inductor, and a second end of the first coil is connected with the eleventh node;

the first end of the first diode is connected with the first end of the direct current conversion circuit module, the second end of the first diode is connected with the first end of the second diode, the second end of the second diode is connected with the second end of the direct current conversion circuit module, a twelfth node is arranged between the second end of the first diode and the first end of the second diode, and the twelfth node is connected with the first end of the second coil;

the first end of the third diode is connected with the first end of the direct current conversion circuit module, the second end of the third diode is connected with the first end of the fourth diode, the second end of the fourth diode is connected with the second end of the direct current conversion circuit module, a thirteenth node is arranged between the second end of the third diode and the first end of the fourth diode, and the thirteenth node is connected with the second end of the second coil.

8. The vehicle-mounted charging system according to claim 7, wherein the direct-current conversion circuit module includes:

a sixteenth capacitor, a first end of the sixteenth capacitor is connected to the first end of the first diode and the first end of the third diode, respectively, and a second end of the sixteenth capacitor is connected to the second end of the second diode and the second end of the fourth diode, respectively;

a fifth diode and a fifteenth switching tube, a first end of the fifth diode is connected to the first end of the battery pack, a second end of the fifth diode is connected to the first end of the fifteenth switching tube, a second end of the fifteenth switching tube is respectively connected to the second end of the sixteenth capacitor and the second end of the battery pack, a control end of the fifteenth switching tube is connected to the control module, a fourteenth node is arranged between the second end of the fifth diode and the first end of the fifteenth switching tube, and the fourteenth node is connected to the first end of the sixteenth capacitor through a seventh inductor;

a seventeenth capacitor, a first end of the seventeenth capacitor is connected to the first end of the fifth diode and the first end of the battery pack, and a second end of the seventeenth capacitor is connected to the second end of the fifteenth switching tube and the second end of the battery pack.

9. The vehicle charging system according to claim 8, wherein the second resonance circuit module includes:

a first end of the eighteenth capacitor is connected with the second end of the electric unit, and a second end of the eighteenth capacitor is connected with the second end of the second switch tube;

a sixteenth switching tube and a seventeenth switching tube, wherein a first end of the sixteenth switching tube is connected to the first end of the eighteenth capacitor, a control end of the sixteenth switching tube is connected to the control module, a second end of the sixteenth switching tube is connected to the first end of the seventeenth switching tube, a second end of the seventeenth switching tube is connected to the second end of the eighteenth capacitor, a control end of the seventeenth switching tube is connected to the control module, and a fifteenth node is arranged between the second end of the sixteenth switching tube and the first end of the seventeenth switching tube;

a nineteenth capacitor and a twentieth capacitor, wherein a first end of the nineteenth capacitor is connected with a first end of the sixteenth switching tube, a second end of the nineteenth capacitor is connected with a first end of the twentieth capacitor, a second end of the twentieth capacitor is connected with a second end of the seventeenth switching tube, and a sixteenth node is arranged between the second end of the nineteenth capacitor and the first end of the twentieth capacitor;

the second transformer comprises a third coil and a fourth coil, a first end of the third coil is connected with the fifteenth node through an eighth inductor, and a second end of the third coil is connected with the sixteenth node;

a sixth diode and a seventh diode, wherein a first end of the sixth diode is connected to the first end of the sixteenth capacitor, a second end of the sixth diode is connected to the first end of the seventh diode, a second end of the seventh diode is connected to the second end of the sixteenth capacitor, a seventeenth node is arranged between the second end of the sixth diode and the first end of the seventh diode, and the seventeenth node is connected to the first end of the fourth coil;

the first end of the eighth diode is connected with the first end of the sixth diode and the first end of the sixteenth capacitor, the second end of the eighth diode is connected with the first end of the ninth diode, the second end of the ninth diode is connected with the second end of the seventh diode and the second end of the sixteenth capacitor, an eighteenth node is arranged between the second end of the eighth diode and the first end of the ninth diode, and the eighteenth node is connected with the second end of the fourth coil.

10. A vehicle characterized by comprising a battery pack and the on-vehicle charging system according to any one of claims 1 to 9.