CN112821530A - Vehicle-mounted charging circuit and method and vehicle-mounted power supply - Google Patents

Vehicle-mounted charging circuit and method and vehicle-mounted power supply Download PDF

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Publication number
CN112821530A
CN112821530A CN202110028968.5A CN202110028968A CN112821530A CN 112821530 A CN112821530 A CN 112821530A CN 202110028968 A CN202110028968 A CN 202110028968A CN 112821530 A CN112821530 A CN 112821530A
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voltage
mos tube
main transformer
conversion circuit
inductor
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CN202110028968.5A
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CN112821530B (en
Inventor
姚云鹏
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Suzhou Huichuan United Power System Co Ltd
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Suzhou Huichuan United Power System Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention belongs to the technical field of automobile electronic power supplies, and discloses a vehicle-mounted charging circuit, a vehicle-mounted charging method and a vehicle-mounted power supply. The vehicle-mounted charging circuit comprises a rectifying circuit, a first DC/DC conversion circuit, a main transformer and a second DC/DC conversion circuit, wherein the main transformer comprises a primary winding, a first secondary winding and a second secondary winding; the power supply system is characterized in that a power grid side, a rectifying circuit, a primary side winding of a main transformer, a first secondary side winding of the main transformer, a first DC/DC conversion circuit and a high-voltage battery side are sequentially connected; and a second secondary winding of the main transformer is connected with the input end of a second DC/DC conversion circuit, and the output end of the second DC/DC conversion circuit is connected with the side of the low-voltage battery. According to the invention, the rectifying circuit, the first DC/DC conversion circuit, the main transformer and the second DC/DC conversion circuit realize topological integration on a power level through a shared magnetic device and a semiconductor device, so that the power density of high-voltage conversion and low-voltage rectification integration is improved.

Description

Vehicle-mounted charging circuit and method and vehicle-mounted power supply
Technical Field
The invention relates to the technical field of automobile electronic power supplies, in particular to a vehicle-mounted charging circuit and method and a vehicle-mounted power supply.
Background
At present, batteries of electric vehicles include two parts, a 400V/800V high-voltage battery and a 12V low-voltage battery. There are two ways to charge a high voltage battery: the first is direct current quick charging; the second is alternating current slow charging. The on-board charger (OBC) is an energy conversion device between an alternating current slow charging medium power grid and a high-voltage battery. Charging of the low voltage battery is accomplished by a high to low voltage DC-DC converter (LDC). At present, the physical integration of the OBC and the LDC is commonly adopted in passenger electric vehicles to achieve higher power density while maintaining excellent energy transmission performance.
However, the OBC and the LDC are adopted as two independent energy conversion devices, and the OBC does not work in the driving process, so that redundancy of semiconductor switching devices is caused, and the power density improvement of the power supply system of the electric automobile is influenced. When the power grid charges the high-voltage battery through the OBC, the power transmitted from the high-voltage battery to the low-voltage battery through the LDC needs to be deducted from the charging power, and the power level of the magnetic element exceeds the power level of taking power from the power grid, so that the design of a magnetic device is redundant, and the improvement of the power density is not facilitated.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a vehicle-mounted charging circuit, a vehicle-mounted charging method and a vehicle-mounted power supply, and aims to solve the technical problem that the power density of a power supply system is reduced due to device redundancy in the existing vehicle-mounted power supply mode.
In order to achieve the above object, the present invention provides an in-vehicle charging circuit, including: the transformer comprises a rectifying circuit, a first DC/DC conversion circuit, a main transformer and a second DC/DC conversion circuit, wherein the main transformer comprises a primary winding, a first secondary winding and a second secondary winding; wherein the content of the first and second substances,
the input end of the rectifying circuit is connected with the power grid side, and the output end of the rectifying circuit is connected with the primary winding of the main transformer;
the input end of the first DC/DC conversion circuit is connected with the first secondary winding of the main transformer, and the output end of the first DC/DC conversion circuit is connected with the side of the high-voltage battery;
and a second secondary winding of the main transformer is connected with the input end of the second DC/DC conversion circuit, and the output end of the second DC/DC conversion circuit is connected with the side of the low-voltage battery.
Optionally, the rectifier circuit comprises: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a first capacitor and a first inductor; wherein the content of the first and second substances,
the drain electrode of the first MOS tube is connected with the first output end of the power grid side, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the second output end of the power grid side;
the drain electrode of the third MOS tube is connected with the drain electrode of the first MOS tube, the source electrode of the third MOS tube is connected with the drain electrode of the fourth MOS tube, and the source electrode of the fourth MOS tube is connected with the source electrode of the second MOS tube;
the first end of the first capacitor is connected with the source electrode of the first MOS tube, the second end of the first capacitor is connected with the first end of the first inductor, the second end of the first inductor is connected with the first end of the primary winding of the main transformer, and the second end of the primary winding of the main transformer is connected with the source electrode of the third MOS tube.
Optionally, the first DC/DC conversion circuit comprises: the fifth MOS tube, the sixth MOS tube, the seventh MOS tube, the eighth MOS tube, the second capacitor and the second inductor; wherein the content of the first and second substances,
the first end of the second inductor is connected with the first end of the first secondary winding of the main transformer, the second end of the second inductor is connected with the first end of the second capacitor, and the second end of the second capacitor is respectively connected with the source electrode of the fifth MOS tube and the drain electrode of the sixth MOS tube;
the drain electrode of the fifth MOS tube is connected with the drain electrode of the seventh MOS tube, the source electrode of the seventh MOS tube is connected with the drain electrode of the eighth MOS tube, and the source electrode of the eighth MOS tube is connected with the source electrode of the sixth MOS tube;
the drain electrode of the eighth MOS tube is connected with the second end of the first secondary winding of the main transformer;
the drain electrode of the seventh MOS tube is connected with the first input end of the high-voltage battery side, and the source electrode of the eighth MOS tube is connected with the second input end of the high-voltage battery side.
Optionally, the second DC/DC conversion circuit includes a ninth MOS transistor, a tenth MOS transistor, an eleventh MOS transistor, a twelfth MOS transistor, a thirteenth MOS transistor, a fourteenth MOS transistor, a third capacitor, a third inductor, and a fourth inductor; wherein the content of the first and second substances,
the first end of the third inductor is connected with the first end of the second secondary winding of the main transformer, and the second end of the third inductor is connected with the source electrode of the ninth MOS tube and the drain electrode of the tenth MOS tube;
the drain electrode of the ninth MOS tube is connected with the drain electrode of the eleventh MOS tube, the source electrode of the eleventh MOS tube is connected with the drain electrode of the twelfth MOS tube, and the source electrode of the tenth MOS tube is connected with the source electrode of the twelfth MOS tube;
a first end of the third capacitor is connected with a drain electrode of the eleventh MOS transistor, and a second end of the third capacitor is connected with a source electrode of the twelfth MOS transistor;
the drain electrode of the thirteenth MOS tube is connected with the first end of the third capacitor, the source electrode of the thirteenth MOS tube is connected with the drain electrode of the fourteenth MOS tube, and the source electrode of the fourteenth MOS tube is connected with the second end of the third capacitor;
the first end of the fourth inductor is connected with the drain electrode of the fourteenth MOS tube, the second end of the fourth inductor is connected with the first input end of the low-voltage battery side, and the source electrode of the fourteenth MOS tube is connected with the second input end of the low-voltage battery side.
Optionally, a primary winding of the main transformer is connected to the first inductor, a first secondary winding of the main transformer is connected to the second inductor, and a second secondary winding of the main transformer is connected to the third inductor; wherein the content of the first and second substances,
the first inductor, the second inductor, the third inductor and the main transformer are connected in a magnetic integration mode.
Optionally, the first MOS transistor to the fourteenth MOS transistor are N-type MOSFETs.
Optionally, the vehicle-mounted charging circuit further comprises a control circuit; wherein the content of the first and second substances,
the grid electrodes of the first MOS tube to the fourteenth MOS tube are connected with the control circuit so as to control the wave transmission of the first MOS tube to the fourteenth MOS tube to be constant frequency or variable frequency.
In addition, to achieve the above object, the present invention also provides an in-vehicle charging method based on the in-vehicle charging circuit as described above, the in-vehicle charging circuit including: the vehicle-mounted charging method comprises the following steps of:
judging a current working mode;
when the current working mode is a power grid side input mode, the rectifying circuit receives alternating voltage input by a power grid side, converts the alternating voltage into high-voltage direct voltage and outputs the high-voltage direct voltage to the main transformer;
the main transformer outputs the high-voltage direct current voltage to a high-voltage battery side through a first DC/DC conversion circuit so as to charge the high-voltage battery;
and/or the presence of a gas in the gas,
the main transformer transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit converts the high-voltage direct current voltage into low-voltage direct current voltage and outputs the low-voltage direct current voltage to a low-voltage battery side so as to charge a low-voltage battery.
Optionally, after the step of determining the current operating mode, the method further includes:
when the current working mode is a high-voltage side input mode, the first DC/DC conversion circuit receives direct-current voltage input by a high-voltage battery side, converts the direct-current voltage into high-voltage direct-current voltage and outputs the high-voltage direct-current voltage to the main transformer;
the main transformer converts the high-voltage direct current voltage into alternating current voltage and outputs the alternating current voltage to the power grid side through a rectifying circuit;
and/or the presence of a gas in the gas,
the main transformer transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit receives the high-voltage direct current voltage, converts the high-voltage direct current voltage into low-voltage direct current voltage, and outputs the low-voltage direct current voltage to a low-voltage battery side so as to charge a low-voltage battery.
In addition, in order to achieve the above object, the present invention also provides an in-vehicle power supply including the in-vehicle charging circuit described above, or applying the in-vehicle charging method described above.
The invention provides a vehicle-mounted charging circuit, which comprises: the transformer comprises a rectifying circuit, a first DC/DC conversion circuit, a main transformer and a second DC/DC conversion circuit, wherein the main transformer comprises a primary winding, a first secondary winding and a second secondary winding; the input end of the rectifying circuit is connected with the power grid side, and the output end of the rectifying circuit is connected with the primary winding of the main transformer; the input end of the first DC/DC conversion circuit is connected with the first secondary winding of the main transformer, and the output end of the first DC/DC conversion circuit is connected with the side of the high-voltage battery; and a second secondary winding of the main transformer is connected with the input end of the second DC/DC conversion circuit, and the output end of the second DC/DC conversion circuit is connected with the side of the low-voltage battery. In the invention, the second secondary winding of the main transformer is connected with the second DC/DC conversion circuit, and the rectifying circuit, the first DC/DC conversion circuit, the main transformer and the second DC/DC conversion circuit realize topological integration on a power level through a shared magnetic device and a semiconductor device, thereby further improving the power density of a high-voltage conversion and low-voltage rectification integrated product. The vehicle-mounted charging circuit is used in the vehicle-mounted charger, so that the power density of the charger can be effectively improved, the design of the vehicle-mounted charger is more compact, the cost of the charger can be reduced, and the technical problem that the power density of a power supply system is reduced due to the fact that device redundancy exists in the existing vehicle-mounted power supply mode is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a vehicle charging circuit according to the present invention;
FIG. 2 is a circuit diagram of an embodiment of the vehicle charging circuit of the present invention;
FIG. 3 is a diagram of a magnetically integrated circuit configuration of an embodiment of the vehicle charging circuit of the present invention;
FIG. 4 is a schematic flow chart of a first embodiment of a vehicle charging method based on a vehicle charging circuit according to the present invention;
FIG. 5 is a schematic diagram of a wave generation in a power grid-side input mode according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the wave generation in the high-side input mode according to an embodiment of the present invention;
fig. 7 is a schematic wave-generating diagram of a low-voltage side input mode according to an embodiment of the invention.
The reference numbers illustrate:
Figure BDA0002889742840000051
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a vehicle-mounted charging circuit.
Referring to fig. 1, in an embodiment of the present invention, the vehicle-mounted charging circuit includes: the transformer comprises a rectifying circuit 101, a first DC/DC conversion circuit 102, a main transformer T1 and a second DC/DC conversion circuit 200, wherein the main transformer T1 comprises a primary winding, a first secondary winding and a second secondary winding; wherein the content of the first and second substances,
the input end of the rectifying circuit 101 is connected with the power grid side, and the output end of the rectifying circuit 101 is connected with the primary winding of the main transformer T1;
the input end of the first DC/DC conversion circuit 102 is connected to the first secondary winding of the main transformer T1, and the output end of the first DC/DC conversion circuit 102 is connected to the high-voltage battery side;
the second secondary winding of the main transformer T1 is connected to the input of the second DC/DC conversion circuit 200, and the output of the second DC/DC conversion circuit 200 is connected to the low-voltage battery.
In this embodiment, the rectifying circuit 101, the first DC/DC converting circuit 102, and the main transformer T1 may form the high voltage converting circuit 100, and then a first end of the high voltage converting circuit 100 is connected to the grid side, a second end of the high voltage converting circuit 100 is connected to the high voltage battery side, a third end of the high voltage converting circuit 100 is connected to a first end of the second DC/DC converting circuit 200, and a second end of the second DC/DC converting circuit 200 is connected to the low voltage battery side. The high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200 share a magnetic device and a semiconductor device through the second secondary winding of the main transformer T1, and topological integration is realized on a power stage through the shared magnetic device and the semiconductor device, so that the power density of integrated products of the high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200 is further improved.
It is easy to understand that the high voltage conversion circuit 100 is configured to receive an ac voltage input from the grid side, convert the ac voltage into a high voltage dc voltage, and output the high voltage dc voltage to the high voltage battery side, so as to charge the high voltage battery. The high voltage conversion circuit 100 may be an on-board charger (OBC) having a function of receiving an ac power supply, converting the ac power supply into a dc power supply, and charging a high voltage battery of the electric vehicle. The main transformer T1 may include a primary winding, a first secondary winding, and a second secondary winding, the main transformer T1 is connected to the grid side and the high-voltage battery side through the primary winding and the first secondary winding, the rectifier circuit 101 may receive the ac voltage input from the grid side, convert the ac voltage into a high-voltage DC voltage, and output the high-voltage DC voltage to the high-voltage battery side through the first secondary winding of the main transformer T1 and the first DC/DC conversion circuit 102, so as to charge the high-voltage battery.
It should be understood that the energy of the grid side can be transmitted to the high voltage battery side through the rectification circuit 101, the primary winding of the main transformer T1, the first secondary winding of the main transformer T1, and the first DC/DC conversion circuit 102, which are connected in sequence; the energy of the high-voltage battery side may also be transmitted to the grid side through the first DC/DC conversion circuit 102, the first secondary winding of the main transformer T1, the primary winding of the main transformer T1, and the rectification circuit 101, which are connected in sequence, which is not limited in this embodiment.
The high voltage converting circuit 100 is further configured to transmit the high voltage DC voltage to the second DC/DC converting circuit 200. In this embodiment, the main transformer T1 is connected to the second DC/DC conversion circuit 200 through the second secondary winding, the second DC/DC conversion circuit 200 is connected to the low-voltage battery side, and the high-voltage conversion circuit 100 can transmit the high-voltage direct current voltage to the second DC/DC conversion circuit 200 through the second secondary winding of the main transformer T1. The high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200 share a magnetic device and a semiconductor device through the second secondary winding of the main transformer T1, and topological integration is realized on a power stage through the shared magnetic device and the semiconductor device, so that the power density of integrated products of the high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200 is further improved.
The second DC/DC conversion circuit 200 is configured to receive the high-voltage DC voltage, convert the high-voltage DC voltage into a low-voltage DC voltage, and output the low-voltage DC voltage to the low-voltage battery side, so as to charge the low-voltage battery. In this embodiment, the second DC/DC conversion circuit 200 may be a low voltage DC-DC converter (LDC), and the low voltage DC-DC converter LDC converts the high voltage DC voltage into a low voltage DC voltage and outputs the low voltage DC voltage to the low voltage battery side, so as to charge the low voltage battery, and the LDC is enabled to charge the low voltage battery with the power transmitted from the high voltage conversion circuit 100. The LDC may be a device for converting the high voltage of the battery into the low voltage of 12V to supply power to the electronic load of the electric vehicle or the hybrid vehicle, and the specific conversion voltage of the second DC/DC conversion circuit 200 is not limited in this embodiment.
It is easy to understand that the energy of the grid side can be transmitted to the low-voltage battery side through the rectification circuit 101, the primary winding of the main transformer T1, the second secondary winding of the main transformer T1, and the second DC/DC conversion circuit 200 which are connected in sequence; the energy of the low-voltage battery side may also be transmitted to the grid side through the second DC/DC conversion circuit 200, the second secondary winding of the main transformer T1, the primary winding of the main transformer T1, and the rectification circuit 101, which are connected in sequence, which is not limited in this embodiment.
In this embodiment, the vehicle-mounted charging circuit includes: the transformer comprises a rectifying circuit 101, a first DC/DC conversion circuit 102, a main transformer T1 and a second DC/DC conversion circuit 200, wherein the main transformer T1 comprises a primary winding, a first secondary winding and a second secondary winding; the input end of the rectifying circuit 101 is connected with the power grid side, and the output end of the rectifying circuit 101 is connected with the primary winding of the main transformer T1; the input end of the first DC/DC conversion circuit 102 is connected to the first secondary winding of the main transformer T1, and the output end of the first DC/DC conversion circuit 102 is connected to the high-voltage battery side; the second secondary winding of the main transformer T1 is connected to the input of the second DC/DC conversion circuit 200, and the output of the second DC/DC conversion circuit 200 is connected to the low-voltage battery. In the invention, the second secondary winding of the main transformer T1 is connected with the second DC/DC conversion circuit, and the rectifying circuit 101, the first DC/DC conversion circuit 102, the main transformer T1 and the second DC/DC conversion circuit realize topological integration on a power stage through a shared magnetic device and a semiconductor device, thereby further improving the power density of an integrated product of the high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200. The vehicle-mounted charging circuit is used in the vehicle-mounted charger, so that the power density of the charger can be effectively improved, the design of the vehicle-mounted charger is more compact, the cost of the charger can be reduced, and the technical problem that the power density of a power supply system is reduced due to the fact that device redundancy exists in the existing vehicle-mounted power supply mode is solved.
Further, referring to fig. 2, the rectifier circuit 101 includes: the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, the fourth MOS transistor Q4, the first capacitor C1 and the first inductor L1; wherein the content of the first and second substances,
the drain of the first MOS transistor Q1 is connected to the first output terminal of the power grid side, the source of the first MOS transistor Q1 is connected to the drain of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is connected to the second output terminal of the power grid side;
the drain of the third MOS transistor Q3 is connected to the drain of the first MOS transistor Q1, the source of the third MOS transistor Q3 is connected to the drain of the fourth MOS transistor Q4, and the source of the fourth MOS transistor Q4 is connected to the source of the second MOS transistor Q2;
a first end of the first capacitor C1 is connected to the source of the first MOS transistor Q1, a second end of the first capacitor C1 is connected to a first end of the first inductor L1, a second end of the first inductor L1 is connected to a first end of a primary winding of the main transformer T1, and a second end of a primary winding of the main transformer T1 is connected to the source of the third MOS transistor Q3.
It should be noted that the high-voltage conversion circuit 100 is a high-voltage DC-DC part of the vehicle-mounted charging circuit in this embodiment, and the high-voltage conversion circuit 100 may include a rectification circuit 101, a first DC/DC conversion circuit 102, and a main transformer T1; the rectifier circuit 101 may include: the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, the fourth MOS transistor Q4, the first capacitor C1 and the first inductor L1.
Specifically, the first capacitor C1 may be a resonant capacitor or a dc blocking capacitor, and the first inductor L1 may be an independent inductor or a transformer leakage inductor. Unilateral resonance compensation can be carried out through the first capacitor C1 and the first inductor L1, so that the resonance current waveform is smoother, the noise and the loss of the high-voltage conversion circuit 100 can be reduced due to less current clutter, the number of resonance elements can be reduced, and the size of the high-voltage conversion circuit 100 and the heat productivity of devices can be further reduced.
Further, with continued reference to fig. 2, the first DC/DC conversion circuit 102 includes: a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh MOS transistor Q7, an eighth MOS transistor Q8, a second capacitor C2, and a second inductor L2; wherein the content of the first and second substances,
a first end of the second inductor L2 is connected to a first end of a first secondary winding of the main transformer T1, a second end of the second inductor L2 is connected to a first end of the second capacitor C2, and second ends of the second capacitor C2 are respectively connected to a source of the fifth MOS transistor Q5 and a drain of the sixth MOS transistor Q6;
the drain of the fifth MOS transistor Q5 is connected to the drain of the seventh MOS transistor Q7, the source of the seventh MOS transistor Q7 is connected to the drain of the eighth MOS transistor Q8, and the source of the eighth MOS transistor Q8 is connected to the source of the sixth MOS transistor Q6;
the drain of the eighth MOS transistor Q8 is connected to the second end of the first secondary winding of the main transformer T1;
the drain of the seventh MOS transistor Q7 is connected to the first input terminal of the high-voltage battery, and the source of the eighth MOS transistor Q8 is connected to the second input terminal of the high-voltage battery.
It should be noted that the first DC/DC conversion circuit 102 may include: a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh MOS transistor Q7, an eighth MOS transistor Q8, a second capacitor C2, and a second inductor L2; the second capacitor C2 may be a resonant capacitor or a dc blocking capacitor, and the second inductor L2 may be an independent inductor or a transformer leakage inductor. Unilateral resonance compensation can be carried out through the second capacitor C2 and the second inductor L2, so that the resonance current waveform is smoother, the noise and the loss of the high-voltage conversion circuit 100 can be reduced due to less current clutter, the number of resonance elements can be reduced, and the size of the high-voltage conversion circuit 100 and the heat productivity of devices can be reduced.
Further, with continued reference to fig. 2, the second DC/DC conversion circuit 200 includes a ninth MOS transistor Q9, a tenth MOS transistor Q10, an eleventh MOS transistor Q11, a twelfth MOS transistor Q12, a thirteenth MOS transistor Q13, a fourteenth MOS transistor Q14, a third capacitor C3, a third inductor L3, and a fourth inductor L4; wherein the content of the first and second substances,
a first end of the third inductor L3 is connected to a first end of a second secondary winding of the main transformer T1, and a second end of the third inductor L3 is connected to a source of the ninth MOS transistor Q9 and a drain of the tenth MOS transistor Q10;
the drain of the ninth MOS transistor Q9 is connected to the drain of the eleventh MOS transistor Q11, the source of the eleventh MOS transistor Q11 is connected to the drain of the twelfth MOS transistor Q12, and the source of the tenth MOS transistor Q10 is connected to the source of the twelfth MOS transistor Q12;
a first end of the third capacitor C3 is connected to the drain of the eleventh MOS transistor Q11, and a second end of the third capacitor C3 is connected to the source of the twelfth MOS transistor Q12;
the drain of the thirteenth MOS transistor Q13 is connected to the first end of the third capacitor C3, the source of the thirteenth MOS transistor Q13 is connected to the drain of the fourteenth MOS transistor Q14, and the source of the fourteenth MOS transistor Q14 is connected to the second end of the third capacitor C3;
a first end of the fourth inductor L4 is connected to the drain of the fourteenth MOS transistor Q14, a second end of the fourth inductor L4 is connected to the first input end of the low-voltage battery, and a source of the fourteenth MOS transistor Q14 is connected to the second input end of the low-voltage battery.
Note that, the high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200 share a magnetic device and a semiconductor device through the second secondary winding of the main transformer T1, and the second DC/DC conversion circuit 200 may include a ninth MOS transistor Q9, a tenth MOS transistor Q10, an eleventh MOS transistor Q11, a twelfth MOS transistor Q12, a thirteenth MOS transistor Q13, a fourteenth MOS transistor Q14, a third capacitor C3, a third inductor L3, and a fourth inductor L4; the third capacitor C3 may be a low-voltage bus filter capacitor, the third inductor L3 may be an independent inductor or a transformer leakage inductor, and the fourth inductor L4 may be an output filter inductor.
Further, referring to fig. 3, the primary winding of the main transformer T1 is connected to the first inductor L1, the first secondary winding of the main transformer T1 is connected to the second inductor L2, and the second secondary winding of the main transformer T1 is connected to the third inductor L3; the first inductor L1, the second inductor L2, the third inductor L3 and the main transformer T1 are connected in a magnetic integration manner.
It should be noted that, referring to fig. 3, the first inductor L1, the second inductor L2, the third inductor L3 and the main transformer T1 adopt a magnetic integration manner, and the magnetic integration is to wind two or more Discrete Devices (DM), such as inductors, transformers, etc., in the converter around a pair of magnetic cores, so as to structurally concentrate together, thereby reducing the volume and weight of the magnetic devices, and sometimes reducing current ripple, reducing magnetic loss, and improving the dynamic performance of the power supply, which is significant for improving the performance and power density of the power supply.
Specifically, by adopting a magnetic integration mode, the vehicle-mounted charging circuit does not have any magnetic device except for the fourth inductor L4, namely the low-voltage side output filter inductor, and is simple. In this embodiment, a three-port power converter topology is provided, and after the topology is adopted, a plurality of magnetic devices of the high-voltage conversion circuit 100 and the second DC/DC conversion circuit 200 may be integrated into the same magnetic device, so that the design of the vehicle-mounted charging circuit is simple. After the vehicle-mounted charging circuit topology is used in the vehicle-mounted charger, the power density of the charger can be effectively improved, so that the design of the vehicle-mounted charger is more compact, and meanwhile, the cost of the charger can be reduced.
Further, with continuing reference to fig. 2 or fig. 3, the first to fourteenth MOS transistors Q1 to Q14 are N-type MOSFETs.
Further, the vehicle-mounted charging circuit further comprises a control circuit; wherein the content of the first and second substances,
the gates of the first MOS transistor Q1 to the fourteenth MOS transistor Q14 are connected to the control circuit (not shown) to control the wave generation of the first MOS transistor Q1 to the fourteenth MOS transistor Q14 to be fixed frequency or variable frequency.
An embodiment of the present invention provides a vehicle charging method based on the vehicle charging circuit described above, where the vehicle charging circuit includes: referring to fig. 4, fig. 4 is a schematic flow chart of a first embodiment of a vehicle charging method based on a vehicle charging circuit according to the present invention.
In this embodiment, the vehicle-mounted charging method includes the following steps:
step S10: and judging the current working mode.
It should be noted that, in the present embodiment, the vehicle-mounted charging method can implement the following three operation modes based on the vehicle-mounted charging circuit, and the present embodiment is described in the following three ways, and the specific operation mode is not limited in the present embodiment. The operating modes may include a grid-side input mode, a high-side input mode, and a low-side input mode.
Step S20: and when the current working mode is a power grid side input mode, the rectifying circuit receives alternating voltage input by the power grid side, converts the alternating voltage into high-voltage direct voltage and outputs the high-voltage direct voltage to the main transformer.
The rectifier circuit, the first DC/DC conversion circuit, and the main transformer may form a high voltage conversion circuit, where the high voltage conversion circuit may be an on-board charger (OBC) having a function of receiving an ac power supply, converting the ac power supply into a DC power supply, and charging a high voltage battery of the electric vehicle. The main transformer can comprise a primary winding, a first secondary winding and a second secondary winding, the main transformer is respectively connected with the power grid side and the high-voltage battery side through the primary winding and the first secondary winding, the rectifying circuit can receive alternating voltage input by the power grid side and convert the alternating voltage into high-voltage direct current voltage, and the high-voltage direct current voltage is output to the high-voltage battery side through the first secondary winding and the first DC/DC conversion circuit of the main transformer so as to charge the high-voltage battery.
Step S30: the main transformer outputs the high-voltage direct current voltage to a high-voltage battery side through a first DC/DC conversion circuit so as to charge the high-voltage battery.
It is easy to understand that the energy on the power grid side can be transmitted to the high-voltage battery side through the rectifying circuit, the primary winding of the main transformer, the first secondary winding of the main transformer and the first DC/DC conversion circuit which are connected in sequence; the energy of the high-voltage battery side may also be transmitted to the grid side through the first DC/DC conversion circuit, the first secondary winding of the main transformer, the primary winding of the main transformer, and the rectification circuit, which are connected in sequence, which is not limited in this embodiment.
It should be understood that the main transformer is connected to a second DC/DC conversion circuit via a second secondary winding, the second DC/DC conversion circuit is connected to the low-voltage battery side, and the high-voltage conversion circuit can transmit said high-voltage direct voltage to said second DC/DC conversion circuit via the second secondary winding of the main transformer. The magnetic device and the semiconductor device shared by the high-voltage conversion circuit and the second DC/DC conversion circuit are realized through the second secondary winding of the main transformer, and topology integration is realized on a power level through the magnetic device and the semiconductor device shared, so that the power density of integrated products of the high-voltage conversion circuit and the second DC/DC conversion circuit is further improved.
Step S40: the main transformer transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit converts the high-voltage direct current voltage into low-voltage direct current voltage and outputs the low-voltage direct current voltage to a low-voltage battery side so as to charge a low-voltage battery.
It should be noted that the second DC/DC conversion circuit may be a low-voltage DC-DC converter (LDC), and the low-voltage DC-DC converter LDC converts the high-voltage DC voltage into a low-voltage DC voltage and outputs the low-voltage DC voltage to the low-voltage battery side, so as to charge the low-voltage battery, and the LDC is enabled to charge the low-voltage battery with the power transmitted from the high-voltage conversion circuit. The LDC may be a device for converting the high voltage of the battery into the low voltage of 12V to supply power to the electronic load of the electric vehicle or the hybrid vehicle, and the specific conversion voltage of the second DC/DC conversion circuit is not limited in this embodiment.
It is easy to understand that the energy on the power grid side can be transmitted to the low-voltage battery side through the rectification circuit, the primary winding of the main transformer, the second secondary winding of the main transformer and the second DC/DC conversion circuit which are connected in sequence; the energy of the low-voltage battery side may also be transmitted to the power grid side through the second DC/DC conversion circuit, the second secondary winding of the main transformer, the primary winding of the main transformer, and the rectification circuit, which are connected in sequence, which is not limited in this embodiment.
It should be noted that, in the present embodiment, the vehicle-mounted charging method can implement the following three operation modes based on the vehicle-mounted charging circuit, and the present embodiment is described in the following three ways, and the specific operation mode is not limited in the present embodiment.
Specifically, the first operating mode is: when the current operating mode is the grid-side input mode, the main wave-emitting mode is as shown in fig. 5, where the wave-emitting mode may be a fixed frequency or a variable frequency, at this time, the fifth MOS transistor Q5 to the eighth MOS transistor Q8 do not emit waves, and the ninth MOS transistor Q9 to the twelfth MOS transistor Q12 operate in a synchronous rectification mode, and the driving waveform thereof is synchronized with the current waveform. In the wave generation method of fig. 5, energy may flow from the grid side to both the high-voltage battery side and the low-voltage battery side, or energy may flow from the grid side to either the high-voltage battery side or the low-voltage battery side.
Specifically, the second operation mode is: when the current operating mode is the high-voltage side input mode, the main wave-emitting mode is as shown in fig. 6, wherein the wave-emitting mode may be a fixed frequency or a variable frequency, at this time, the first MOS transistor Q1 to the fourth MOS transistor Q4 do not emit waves or operate in the synchronous rectification mode, and the ninth MOS transistor Q9 to the twelfth MOS transistor Q12 operate in the synchronous rectification mode, and the driving waveforms thereof are synchronized with the current waveforms. In the wave generation method of fig. 6, energy may flow from the high-voltage battery side to the grid side and the low-voltage battery side at the same time, or energy may flow from the high-voltage battery side to either the grid side or the low-voltage battery side alone. For example, when the current operating mode is a high-voltage side input mode, the high-voltage conversion circuit receives a direct-current voltage input by a high-voltage battery side and converts the direct-current voltage into a high-voltage direct-current voltage; the high-voltage conversion circuit converts the high-voltage direct current voltage into alternating current voltage and outputs the alternating current voltage to the power grid side; and/or the high-voltage conversion circuit transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit receives the high-voltage direct current voltage, converts the high-voltage direct current voltage into low-voltage direct current voltage, and outputs the low-voltage direct current voltage to a low-voltage battery side so as to charge a low-voltage battery.
Specifically, the third operating mode is: when the current operating mode is the low-voltage side input mode, the main wave generation mode is as shown in fig. 7; the wave generation may be a fixed frequency or a variable frequency, and at this time, the first MOS transistor Q1 to the eighth MOS transistor Q8 do not generate waves or the first MOS transistor Q1 to the fourth MOS transistor Q4 do not generate waves and the fifth MOS transistor Q5 to the eighth MOS transistor Q8 operate in a synchronous rectification mode. In the wave generation method of fig. 7, energy may flow from the low-voltage battery side to the grid side and the high-voltage battery side at the same time, or energy may flow from the low-voltage battery side to either the grid side or the high-voltage battery side alone. For example: when the current working mode is a low-voltage side input mode, the second DC/DC conversion circuit receives low-voltage direct-current voltage input by a low-voltage battery side, converts the low-voltage direct-current voltage into high-voltage direct-current voltage, and transmits the high-voltage direct-current voltage to the high-voltage conversion circuit; the high-voltage conversion circuit receives the high-voltage direct-current voltage, converts the high-voltage direct-current voltage into low-voltage direct-current voltage, and outputs the low-voltage direct-current voltage to the low-voltage battery side so as to charge a low-voltage battery; and/or the high-voltage conversion circuit receives the high-voltage direct current voltage, converts the high-voltage direct current voltage into alternating current voltage and outputs the alternating current voltage to the power grid side.
The embodiment judges the current working mode; when the current working mode is a power grid side input mode, the rectifying circuit receives alternating voltage input by a power grid side, converts the alternating voltage into high-voltage direct voltage and outputs the high-voltage direct voltage to the main transformer; the main transformer outputs the high-voltage direct current voltage to a high-voltage battery side through a first DC/DC conversion circuit so as to charge the high-voltage battery; and/or the main transformer transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit converts the high-voltage direct current voltage into low-voltage direct current voltage and outputs the low-voltage direct current voltage to the side of a low-voltage battery so as to charge the low-voltage battery. In this embodiment, the second secondary winding of the main transformer is connected to the second DC/DC conversion circuit, and the rectifying circuit, the first DC/DC conversion circuit, the main transformer, and the second DC/DC conversion circuit implement topology integration on the power stage through a common magnetic device and a common semiconductor device, so as to further improve the power density of the integrated product of the high voltage conversion circuit and the second DC/DC conversion circuit. The vehicle-mounted charging circuit is used in the vehicle-mounted charger, so that the power density of the charger can be effectively improved, the design of the vehicle-mounted charger is more compact, the cost of the charger can be reduced, and the technical problem that the power density of a power supply system is reduced due to the fact that device redundancy exists in the existing vehicle-mounted power supply mode is solved.
In order to achieve the above object, the present invention further provides an onboard power supply, which includes the onboard charging circuit described above, or applies the onboard charging method described above. The specific structure of the vehicle-mounted charging circuit refers to the above-mentioned embodiments, the specific flow of the vehicle-mounted charging method refers to the above-mentioned embodiments, and since the vehicle-mounted power supply adopts all technical solutions of all the above-mentioned embodiments, at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are achieved, and details are not repeated here.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment may refer to the vehicle charging circuit provided in any embodiment of the present invention, and are not described herein again.
Further, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or circuit that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or circuit. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or circuit that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. An on-vehicle charging circuit, characterized in that the on-vehicle charging circuit includes: the transformer comprises a rectifying circuit, a first DC/DC conversion circuit, a main transformer and a second DC/DC conversion circuit, wherein the main transformer comprises a primary winding, a first secondary winding and a second secondary winding; wherein the content of the first and second substances,
the input end of the rectifying circuit is connected with the power grid side, and the output end of the rectifying circuit is connected with the primary winding of the main transformer;
the input end of the first DC/DC conversion circuit is connected with the first secondary winding of the main transformer, and the output end of the first DC/DC conversion circuit is connected with the side of the high-voltage battery;
and a second secondary winding of the main transformer is connected with the input end of the second DC/DC conversion circuit, and the output end of the second DC/DC conversion circuit is connected with the side of the low-voltage battery.
2. The vehicle-mounted charging circuit according to claim 1, wherein the rectifying circuit includes: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a first capacitor and a first inductor; wherein the content of the first and second substances,
the drain electrode of the first MOS tube is connected with the first output end of the power grid side, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the second output end of the power grid side;
the drain electrode of the third MOS tube is connected with the drain electrode of the first MOS tube, the source electrode of the third MOS tube is connected with the drain electrode of the fourth MOS tube, and the source electrode of the fourth MOS tube is connected with the source electrode of the second MOS tube;
the first end of the first capacitor is connected with the source electrode of the first MOS tube, the second end of the first capacitor is connected with the first end of the first inductor, the second end of the first inductor is connected with the first end of the primary winding of the main transformer, and the second end of the primary winding of the main transformer is connected with the source electrode of the third MOS tube.
3. The vehicle-mounted charging circuit according to claim 2, wherein the first DC/DC conversion circuit includes: the fifth MOS tube, the sixth MOS tube, the seventh MOS tube, the eighth MOS tube, the second capacitor and the second inductor; wherein the content of the first and second substances,
the first end of the second inductor is connected with the first end of the first secondary winding of the main transformer, the second end of the second inductor is connected with the first end of the second capacitor, and the second end of the second capacitor is respectively connected with the source electrode of the fifth MOS tube and the drain electrode of the sixth MOS tube;
the drain electrode of the fifth MOS tube is connected with the drain electrode of the seventh MOS tube, the source electrode of the seventh MOS tube is connected with the drain electrode of the eighth MOS tube, and the source electrode of the eighth MOS tube is connected with the source electrode of the sixth MOS tube;
the drain electrode of the eighth MOS tube is connected with the second end of the first secondary winding of the main transformer;
the drain electrode of the seventh MOS tube is connected with the first input end of the high-voltage battery side, and the source electrode of the eighth MOS tube is connected with the second input end of the high-voltage battery side.
4. The vehicle-mounted charging circuit according to claim 3, wherein the second DC/DC conversion circuit comprises a ninth MOS transistor, a tenth MOS transistor, an eleventh MOS transistor, a twelfth MOS transistor, a thirteenth MOS transistor, a fourteenth MOS transistor, a third capacitor, a third inductor and a fourth inductor; wherein the content of the first and second substances,
the first end of the third inductor is connected with the first end of the second secondary winding of the main transformer, and the second end of the third inductor is connected with the source electrode of the ninth MOS tube and the drain electrode of the tenth MOS tube;
the drain electrode of the ninth MOS tube is connected with the drain electrode of the eleventh MOS tube, the source electrode of the eleventh MOS tube is connected with the drain electrode of the twelfth MOS tube, and the source electrode of the tenth MOS tube is connected with the source electrode of the twelfth MOS tube;
a first end of the third capacitor is connected with a drain electrode of the eleventh MOS transistor, and a second end of the third capacitor is connected with a source electrode of the twelfth MOS transistor;
the drain electrode of the thirteenth MOS tube is connected with the first end of the third capacitor, the source electrode of the thirteenth MOS tube is connected with the drain electrode of the fourteenth MOS tube, and the source electrode of the fourteenth MOS tube is connected with the second end of the third capacitor;
the first end of the fourth inductor is connected with the drain electrode of the fourteenth MOS tube, the second end of the fourth inductor is connected with the first input end of the low-voltage battery side, and the source electrode of the fourteenth MOS tube is connected with the second input end of the low-voltage battery side.
5. The vehicle charging circuit of claim 4, wherein a primary winding of said main transformer is connected to said first inductor, a first secondary winding of said main transformer is connected to said second inductor, and a second secondary winding of said main transformer is connected to said third inductor; wherein the content of the first and second substances,
the first inductor, the second inductor, the third inductor and the main transformer are connected in a magnetic integration mode.
6. The vehicle-mounted charging circuit according to claim 4, wherein the first MOS transistor to the fourteenth MOS transistor are N-type MOSFETs.
7. The vehicle charging circuit of claim 4, further comprising a control circuit; wherein the content of the first and second substances,
the grid electrodes of the first MOS tube to the fourteenth MOS tube are connected with the control circuit so as to control the wave transmission of the first MOS tube to the fourteenth MOS tube to be constant frequency or variable frequency.
8. An in-vehicle charging method based on the in-vehicle charging circuit according to any one of claims 1 to 7, characterized in that the in-vehicle charging circuit includes: the vehicle-mounted charging method comprises the following steps of:
judging a current working mode;
when the current working mode is a power grid side input mode, the rectifying circuit receives alternating voltage input by a power grid side, converts the alternating voltage into high-voltage direct voltage and outputs the high-voltage direct voltage to the main transformer;
the main transformer outputs the high-voltage direct current voltage to a high-voltage battery side through a first DC/DC conversion circuit so as to charge the high-voltage battery;
and/or the presence of a gas in the gas,
the main transformer transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit converts the high-voltage direct current voltage into low-voltage direct current voltage and outputs the low-voltage direct current voltage to a low-voltage battery side so as to charge a low-voltage battery.
9. The vehicle-mounted charging method according to claim 8, further comprising, after the step of determining the current operating mode:
when the current working mode is a high-voltage side input mode, the first DC/DC conversion circuit receives direct-current voltage input by a high-voltage battery side, converts the direct-current voltage into high-voltage direct-current voltage and outputs the high-voltage direct-current voltage to the main transformer;
the main transformer converts the high-voltage direct current voltage into alternating current voltage and outputs the alternating current voltage to the power grid side through a rectifying circuit;
and/or the presence of a gas in the gas,
the main transformer transmits the high-voltage direct current voltage to a second DC/DC conversion circuit, and the second DC/DC conversion circuit receives the high-voltage direct current voltage, converts the high-voltage direct current voltage into low-voltage direct current voltage, and outputs the low-voltage direct current voltage to a low-voltage battery side so as to charge a low-voltage battery.
10. An on-vehicle power supply characterized in that the on-vehicle power supply comprises the on-vehicle charging circuit according to any one of claims 1 to 7, or the on-vehicle charging method according to any one of claims 8 to 9 is applied.
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Address after: No. 52, Tian'edang Road, Yuexi, Suzhou City, Jiangsu Province, 215104

Patentee after: Suzhou Huichuan United Power System Co.,Ltd.

Address before: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province

Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd.