CN112583095B

CN112583095B - Vehicle-mounted charging system and vehicle with same

Info

Publication number: CN112583095B
Application number: CN201910935346.3A
Authority: CN
Inventors: 吴昊; 许兴发; 刘宇; 杨柳
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2023-03-14
Anticipated expiration: 2039-09-29
Also published as: CN112583095A

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, a conversion circuit module and a control module, wherein the first resonant circuit module is used for carrying out alternating current-direct current conversion processing on an electric signal of a first half period of power supply; the second resonance circuit module is used for carrying out alternating current-direct current conversion processing on the electric signal of the second half period of power supply; the gating circuit module is used for controlling the first resonant circuit module to be connected with the electric unit or controlling the second resonant circuit module to be connected with the electric unit; the conversion circuit module is used for carrying out direct current-direct current conversion on the input electric signal; 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, in which one end of the system is connected to a power grid, and the other end of the system is connected to a battery pack, and the system includes a Part1 'and Part2' two-stage circuit. During forward charging, part1' realizes alternating current-direct current conversion and power factor correction, and outputs direct current voltage. Part2' is a dc-dc converter that outputs a suitable 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 the Part1' and the 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 signals of the second half period of power supply; 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; a first end of the conversion circuit module is connected with the first resonance circuit module and the second resonance circuit module respectively, and a second end of the conversion circuit module is connected with the battery pack and used for performing direct current-direct current conversion on an input electric 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 to the conversion circuit module by the resonant circuit module is a 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 thin-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.

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 circuit diagram of an in-vehicle charging system according to one embodiment of the present invention;

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

FIG. 5 is a block diagram of a vehicle according to one embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

An in-vehicle charging system according to an embodiment of the present invention is described below with reference to fig. 2 to 4.

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, a conversion circuit module 40, 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 a first terminal of the second resonant circuit module 20 is connected to a second terminal of the electrical unit 60. In an embodiment, the electrical unit 60 may include a power grid, an electrical device, and the like.

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

The conversion circuit module 40 is used for performing dc conversion on the input electrical signal, for example, reducing a dc voltage or boosting a dc voltage. In some embodiments, the conversion circuit module 40 may employ a BOOST circuit. A first end of the conversion circuit module 40 is connected to the first resonance circuit module 10 and the second resonance circuit module 20, respectively, and a second end of the conversion circuit module 40 is connected to the battery pack 70.

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 an 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, and controls the second end of the first resonant circuit module 10 to be connected to 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, 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 the conversion circuit module 40, and then the conversion circuit module 40 adjusts the input direct current electrical signal into an electrical signal required by the battery pack 70, thereby charging the battery pack 70.

Similarly, when the control module 50 detects that the power supply has a second half period, for example, 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 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 supplies power 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, the second resonant circuit module 20 converts the ac signal of the negative half period of the power grid into a dc signal, and inputs the dc signal to the conversion circuit module 40, and the conversion circuit module 40 adjusts the input dc signal to a required electrical signal of the battery pack 70, thereby charging the battery pack 70.

In an embodiment, the gating circuit module 30 selects positive and negative periodic electrical signals of the power grid, and in a positive half period, the control module 50 controls the first resonant circuit module 10 to output a forward direct current electrical signal, and in a negative half period, the control module 50 controls the second resonant circuit module 20 to output a forward direct current electrical signal, which is provided to the subsequent converting circuit module 40, that is, the direct current electrical signal provided to the converting circuit module 40 is a steamed bread wave signal, so that filtering with a large-capacity electrolytic capacitor is not required, and filtering with a common capacitor unit is required.

According to the vehicle-mounted charging system 100 provided by the embodiment of the invention, the gating circuit module 30 is arranged, the resonant circuit modules can be gated according to the power supply period, and 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, so that the direct current signals provided by the resonant circuit modules to the conversion circuit module 40 are steamed bread waves, 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 of the electrolytic capacitor and the anti-seismic problem are not needed to be considered, and the stability of the charging system is favorably improved.

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. 3 is a circuit diagram of an onboard charging system in accordance with one embodiment of the present invention, wherein the electrical unit is an electrical grid. As shown in fig. 3, 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 electrical 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 end of the second switching tube Q2 is connected to the second end of the electric unit 60, a second end of the second switching tube Q2 is connected to the second end of the second resonant circuit module 20, and a control end of the second switching tube Q2 is connected to the control module 50.

Specifically, the switching sequence of the control module 50 for the gating circuit module 30 is that, during a 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 tube Q1 is turned off, and the second switching tube Q2 is turned on, so as to gate 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 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. 3, the first resonant circuit module 10 includes a first capacitor C1, a third switching tube Q3, a fourth switching tube Q4, a second capacitor C2, a third capacitor C3, a first transformer T1, a fifth switching tube Q5, a sixth switching tube Q6, a fourth capacitor C4, and a fifth capacitor C5.

A first end of the first capacitor C1 is connected to the first end of the electric unit 60, and a second end of the first capacitor C1 is connected to the second end of the first switching tube Q1. The first capacitor C1 can filter the input electrical signal, so as to reduce the interference of the electrical signal.

The first end of the third switching tube Q3 is connected with the first end of the first capacitor C1, the control end of the third switching tube Q3 is connected with the control module 50, the second end of the third switching tube Q3 is connected with the first end of the fourth switching tube Q4, the second end of the fourth switching tube Q4 is connected with the second end of the first capacitor C1, the control end of the fourth switching tube Q4 is connected with the control module 50, and a first node O1 is arranged between the second end of the third switching tube Q3 and the first end of the fourth switching tube Q4. The first end of the second capacitor C2 is connected to the first end of the third switching tube Q3, the second end of the second capacitor C2 is connected to the first end of the third capacitor C3, the second end of the third capacitor C3 is connected to the second end of the fourth switching tube Q4, and a second node O2 is arranged between the second end of the second capacitor C2 and the first end of the third capacitor C3.

The first transformer T1 includes a first coil W1 and a second coil W2, a first end of the first coil W1 is connected to a first node O1 through a first inductor L1, and a second end of the first coil 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 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 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 arranged 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 the second inductor. A first end of the fourth capacitor C4 is connected to the first end of the fifth switch tube Q5 and the first end of the 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 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 turned on; the grid voltage is applied to the first capacitor C1, the third switching tube Q3 and the fourth switching tube Q4 are switched on and off at a fixed frequency and a fixed duty ratio through the control module 50, the second capacitor C2 and the third capacitor C3 are charged and discharged, and an alternating voltage is formed between a midpoint of the third switching tube Q3 and the fourth switching tube Q4, namely a first node O1, and a midpoint of the second capacitor C2 and the third capacitor C3, namely a second node O2. After being isolated by the first transformer T1, the rectifier circuit composed of the fifth switching tube Q5, the sixth switching tube Q6, the fourth capacitor C4 and the fifth capacitor C5 converts the alternating 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 direct voltage for output, i.e., the voltage provided to the conversion circuit module 40, by controlling the on/off of the fifth switching tube Q5 and the sixth switching tube Q6 and by charging and discharging the fourth capacitor C4 and the fifth capacitor C5, thereby implementing the alternating current-direct current conversion.

As shown in fig. 3, the converting 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 a 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 for filtering an input dc signal, and in the embodiment of the present invention, the sixth capacitor C6 may be a filter capacitor device with a small capacity, such as a thin film capacitor, without an electrolytic capacitor with a large capacity.

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

In the present embodiment, the conversion circuit module 40 is disposed at the rear, so that the duty ratio of the conversion circuit module 40 can be controlled to adjust the charging voltage or the charging power output to the battery pack 70, thereby not only widening the voltage range of the adaptive battery pack, but also shortening the charging time of the battery and the charging efficiency of the battery pack 70.

As shown in fig. 3, 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.

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

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

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

The second transformer T2 includes a third coil W3 and a fourth coil T4, a first end of the third coil T3 is connected to the sixth node O4 through a fourth inductor L4, and a second end 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 the 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 the twelfth switch tube Q12,

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

A first end of the eleventh capacitor C11 is connected to a first end of the eleventh switching tube Q11 and a first end of the sixth capacitor C6, respectively, a second end of the eleventh capacitor C11 is connected to a first end of the twelfth capacitor C12, a second end of the twelfth capacitor C12 is connected to a second end of the twelfth switching tube 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 turned on; the grid voltage is applied to the eighth capacitor C8, and the control module 50 controls the ninth switching tube Q9 and the tenth switching tube Q10 to be turned on and 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 sixth node O6, which is a midpoint of the ninth switching tube Q9 and the tenth switching tube Q10, and a seventh node O7, which is a midpoint of the ninth capacitor C9 and the tenth capacitor C10. 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 controls the on/off of the eleventh switch tube Q11 and the twelfth switch tube Q12 to charge and discharge the eleventh capacitor C11 and the twelfth capacitor C12, and converts an alternating current voltage 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, into a 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 steamed 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 sixth capacitor C6.

Further, the conversion circuit module 40 regulates the input dc voltage to supply to the battery pack 70. Specifically, when the eighth switching tube Q8 is turned on, the current in the third inductor L3 increases, and the current flows in a → L3 → Q8 → B as shown in fig. 3; the eighth switching tube Q8 is turned off, and the current of the third inductor L3 decreases, as shown in fig. 3, and the current flows in a → L3 → Q7 → battery pack → B. 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. 3, 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 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 to the electric equipment or feed the power frequency alternating current back to the power grid.

Referring to fig. 3, specifically, the switching timing of the converting 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 subsequent circuit; when the seventh switch tube Q7 is turned off, the current of the third inductor L3 decreases, and the current continues to flow through the eighth switch tube Q8, and energy is transferred to the subsequent stage. The control module 50 adjusts an output voltage, namely, a voltage across the sixth capacitor C6, by controlling on and off of the seventh switching tube Q7, and a voltage amplitude depends on a switching duty ratio of the seventh switching tube Q7 and a 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 the positive half cycle of the alternating current. Specifically, the fifth switching tube Q5 and the sixth switching tube Q6 are turned on and 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 switching tube Q5 and the sixth switching tube 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 switching on and 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 voltage between the midpoint of the third switching tube Q3 and the fourth switching tube Q4, i.e., the first node O1 and the midpoint of the second capacitor C2 and the third capacitor C3, i.e., the second node O2, is converted into a positive half-cycle part of the power frequency, i.e., voltages at two ends of the first capacitor C1, so as to realize the positive half-cycle part output of the power frequency alternating current.

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 and 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 an eighth node O8, which is a midpoint of the eleventh switch tube Q11 and the twelfth switch tube Q12, and a ninth node O9, which is a midpoint of the eleventh capacitor C11 and the twelfth capacitor C12. 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 and 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 period 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 period 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 negative half-cycle signal 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 turned on.

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. 4 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. 4.

As shown in fig. 4, the first resonant circuit module 10 includes a thirteenth capacitor C13, a thirteenth switching tube Q13, a fourteenth switching tube Q14, a fourteenth capacitor C14, a fifteenth capacitor C15, a third transformer T3, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4.

A first terminal of the thirteenth capacitor C13 is connected to the first terminal of the electrical unit 60, for example, a power 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 the 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 the fourteenth switching tube Q14 is connected to a second end of the thirteenth capacitor C13, a control end of the fourteenth switching tube Q14 is connected to the control module 50, and a tenth node O10 is arranged between the second end of the thirteenth switching tube Q13 and the first end of the fourteenth switching tube Q14; a first end of the fourteenth capacitor C14 is connected to the first end of the thirteenth switching transistor Q13, a second end of the fourteenth capacitor C14 is connected to a first end of the fifteenth capacitor C15, and a second end of the fifteenth capacitor C15 is connected to the first end of the fifteenth capacitor C15

A second end of the fourteenth switching tube Q14 is connected to the first end of the fourteenth capacitor C15, and an eleventh node O11 is located between the second end of the fourteenth capacitor C14 and the first end of the fifteenth capacitor C15.

The third transformer T3 includes a fifth coil W5 and a sixth coil W6, a first end of the fifth coil W5 is connected to the tenth node O10 through a sixth inductor L6, and a second end of the fifth coil W5 is connected to the eleventh node O11. The third transformer T3 realizes transformation and isolation.

A first end of the first diode D1 is connected to a first end of the conversion circuit module 40, a second end of the first diode D1 is connected to a first end of the second diode D2, a second end of the second diode D2 is connected to a second end of the conversion circuit module 40, a twelfth node O12 is provided between the second end of the first diode D1 and the first end of the second diode D2, and the twelfth node O12 is connected to a first end of the sixth coil W6. A first end of the third diode D3 is connected to the first end of the conversion circuit module 40, a second end of the third diode D3 is connected to a first end of the fourth diode D4, a second end of the fourth diode D4 is connected to the second end of the conversion circuit module 40, a thirteenth node O13 is located between the second end of the third diode D3 and the first end of the fourth diode D4, and the thirteenth node O13 is connected to the second end of the sixth coil W6. 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 and 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 third transformer T3, the alternating voltage is provided to a rectifying circuit composed of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, and rectified to form a direct voltage, that is, a voltage provided to the conversion circuit module 40, thereby realizing alternating current-direct current conversion.

As shown in fig. 4, the conversion circuit module 40 includes a sixteenth capacitor C16, a fifth diode D5, a fifteenth switch 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 for filtering 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 switch Q15, a second end of the fifteenth switch Q15 is respectively connected to the second end of the sixteenth capacitor C16 and the second end of the battery pack 70, a control end of the fifteenth switch Q15 is connected to the control module 50, a fourteenth node O14 is disposed between the second end of the fifth diode D5 and the first end of the fifteenth switch Q15, and the fourteenth node Q14 is connected to the first end of the sixteenth capacitor C16 through a seventh inductor L7.

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

As shown in fig. 4, the second resonant circuit module 20 includes an eighteenth capacitor C18, a sixteenth switching tube Q16, a seventeenth switching tube Q17, a nineteenth capacitor C19, a twentieth capacitor C20, a fourth transformer T4, a sixth diode D6, a seventh diode D7, an eighth diode D8, and a ninth diode D9.

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

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

The fourth transformer T4 includes a seventh coil W7 and an eighth coil W8, a first end of the seventh coil W7 is connected to the fifteenth node O15 through an eighth inductor L8, and a second end of the seventh coil W7 is connected to the sixteenth node O16.

A first end of the sixth diode D6 is connected to the first end of the sixteenth capacitor C16, a second end of the sixth diode D6 is connected to the first end of the seventh diode D7, a second end of the seventh diode D7 is connected to the second end of the sixteenth capacitor C16, a seventeenth node O17 is provided between the second end of the sixth diode D6 and the first end of the seventh diode D7, and the seventeenth node O17 is connected to the first end of the eighth coil W8. A first end of the eighth diode D8 is connected to a first end of the sixth diode D6 and a first end of the sixteenth capacitor C16, respectively, a second end of the eighth diode D8 is connected to a first end of the ninth diode D9, a second end of the ninth diode D9 is connected to a second end of the seventh diode D7 and a second end of the sixteenth capacitor C16, respectively, an eighteenth node O18 is provided between the second end of the eighth diode D8 and the first end of the ninth diode D9, and the eighteenth node O18 is connected to the second end of the eighth coil W8. And a sixth diode D6, a seventh diode D7, an eighth diode D8 and a 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, and the second switching tube Q2 is turned on, so as to gate the second resonant circuit module 20. Specifically, the grid voltage is applied to the eighteenth capacitor C18, and the control module 50 performs on/off control of the sixteenth switching tube Q16 and the seventeenth switching tube Q17 at a fixed frequency and a fixed duty cycle, and performs charging and discharging of 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 switching tube Q16 and the seventeenth switching tube 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 fourth transformer T4, the rectified ac voltage is supplied to a rectifier circuit composed of a sixth diode D6, a seventh diode D7, an eighth diode D8, and a ninth diode D9 at the subsequent stage, and the rectifier circuit rectifies the input ac voltage into a dc voltage, that is, a voltage across the sixteenth capacitor C16, thereby realizing ac-dc conversion.

The voltage of the sixteenth capacitor C16 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 steamed bread waves, a large-capacity electrolytic capacitor is not needed for filtering, so that the capacitor C16 can select a small-capacity capacitor, such as a film capacitor.

Further, the 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 in the seventh inductor L7 increases, and the current flows in a → L7 → Q15 → B as shown in fig. 3; when the fifteenth switch Q15 is turned off, the current in the seventh inductor L7 decreases, and the current flows a → L7 → D5 → battery pack → B, as shown in fig. 3. The fifteenth switching tube Q15 is controlled by the control module 50 to be switched 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, and power factor correction can be achieved, 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 devices.

In addition, for the Part of Part2' in fig. 1 being an LLC topology, when the output voltage range is wide, the switching frequency deviates greatly from the resonant frequency, resulting in low charging efficiency. The vehicle-mounted charging system 100 according to the embodiment of the present invention can adjust the duty ratio of the operation of the subsequent conversion circuit module 40 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. And by adjusting the duty cycle of the operation of the conversion circuit module 40, a larger battery voltage range can be adapted.

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. 5 is a block diagram of a vehicle according to one embodiment of the present invention. As shown in fig. 5, a vehicle 1000 according to an embodiment of the present invention includes a battery pack 70 and the vehicle charging system 100 according to the above embodiment, wherein the composition of the vehicle charging system 100 can 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;

a gating circuit module, a first end of which is connected to the first end of the electrical unit, a second end of which is connected to the second end of the electrical unit, a third end of which is connected to the second end of the first resonant circuit module, and a fourth end of which is connected to the second end of the second resonant circuit module, for controlling the second end of the first resonant circuit module to be connected to the second end of the electrical unit when receiving a first gating control signal, or controlling the second end of the second resonant circuit module to be connected to the first end of the electrical unit when receiving a second gating control signal;

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

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

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

2. The in-vehicle charging system according to claim 1, wherein the first resonance circuit module includes:

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 first end of the fifth switching tube is connected with a first end of the 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 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 switch tube and the first end of the 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 switch tube and the second end of the 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.

3. The vehicle charging system according to claim 2, wherein the 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 with a first end of the battery pack, a control end of the seventh switching tube is connected with the control module, a second end of the seventh switching tube is connected with a first end of the eighth switching tube, a second end of the eighth switching tube is respectively connected with a second end of the sixth capacitor and a second end of the battery pack, a control end of the eighth switching tube is connected with 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 with 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.

4. The vehicle charging system according to claim 3, 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;

a second transformer including a third coil and a fourth coil, a first end of the third coil being connected to the sixth node through a fourth inductor, and a second end of the third coil being connected to 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.

5. The vehicle charging system according to claim 1, wherein the first resonance circuit module includes:

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

a third transformer, including a fifth coil and a sixth coil, wherein a first end of the fifth coil is connected to the tenth node through a sixth inductor, and a second end of the fifth coil is connected to the eleventh node;

the first end of the first diode is connected with the first end of the 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 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 sixth coil;

the first end of the third diode is connected with the first end of the 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 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 sixth coil.

6. The vehicle charging system according to claim 5, wherein the 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, wherein 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 switch tube and the second end of the battery pack.

7. The vehicle charging system according to claim 6, 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;

a fourth transformer, which includes a seventh coil and an eighth coil, wherein a first end of the seventh coil is connected to the fifteenth node through an eighth inductor, and a second end of the seventh coil is connected to 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 eighth 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 eighth coil.

8. The vehicle-mounted charging system according to any one of claims 1 to 7, wherein the switching tube comprises one of a MOS tube and a triode.

9. A vehicle characterized by comprising a battery pack and the vehicle-mounted charging system according to any one of claims 1 to 8.