CN112572188B - Vehicle-mounted charging system and vehicle with same - Google Patents
Vehicle-mounted charging system and vehicle with same Download PDFInfo
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- CN112572188B CN112572188B CN201910935261.5A CN201910935261A CN112572188B CN 112572188 B CN112572188 B CN 112572188B CN 201910935261 A CN201910935261 A CN 201910935261A CN 112572188 B CN112572188 B CN 112572188B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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- 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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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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 first rectifying circuit module, a second rectifying circuit module and a control module, wherein the first resonant circuit module and the second resonant circuit module are used for converting an input electric signal and multiplexing a second conversion unit; the gating circuit module is used for gating the first resonance circuit module or the second resonance circuit module; the first rectifying circuit module and the second rectifying circuit module are used for rectifying 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, or controlling the second conversion unit, the first rectifying circuit module and the second rectifying circuit module when the high voltage charges the low voltage. 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
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle-mounted charging system and a vehicle with the same.
Background
Fig. 1 is a circuit diagram of a vehicle charging system in the related art, which is connected to a power grid at one end and a battery pack at the other end, and includes a Part1 'and a Part 2' two-stage circuit. When the battery is charged in the forward direction, Part 1' realizes alternating current-direct current conversion and power factor correction, and outputs direct current voltage. Part 2' is a dc-dc converter that outputs the appropriate voltage to charge the battery pack. For the system, in order to provide stable input direct-current voltage for the later stage Part2 ', a large-capacity electrolytic capacitor C1 ' is needed between Part1 ' and Part2 ', so that the volume and the cost of the system are increased, and the electrolytic capacitor C1 ' has the problems of service life and shock resistance and is unfavorable for the reliability of the system.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an onboard charging system that does not require a large-capacity electrolytic capacitor, reduces the system size, reduces the cost, and improves the system stability.
The invention further provides a vehicle adopting the vehicle-mounted charging system.
In order to solve the above problem, an in-vehicle charging system according to an embodiment of a first aspect of the present invention includes: a first end of the gating circuit module is connected with a first end of the electric unit, and a second end of the gating circuit module is connected with a second end of the electric unit; the first resonant circuit module is used for converting an input electric signal and comprises a first conversion unit, a first transformer and a second conversion unit, wherein the first end of the first conversion unit is connected with the first end of the electric unit, the second end of the first conversion unit is connected with the third end of the gating circuit module, the primary side of the first transformer is connected with the first conversion unit, and the secondary side of the first transformer is connected with the second conversion unit; the second resonant circuit module is used for converting an input electrical signal, and comprises a second conversion unit, a third conversion unit and a second transformer, wherein a first end of the third conversion unit is connected with a second end of the electrical unit, a second end of the third conversion unit is connected with a fourth end of the gating circuit module, a primary side of the second transformer is connected with the third conversion unit, and a secondary side of the second transformer is respectively connected with a secondary side of the first transformer; the first end of the first rectifying circuit module is connected with the secondary side of the first transformer and used for rectifying an input electric signal; a second rectifier circuit module, a first end of which is connected to a secondary side of the second transformer, for rectifying an input electrical signal; and the control module is used for controlling the gating circuit module during a first half period of power supply to gate the first resonant circuit module and control the first resonant circuit module according to a time sequence signal of the first half period of power supply, or controlling the gating circuit module during a second half period of power supply to gate the second resonant circuit module and control the second resonant circuit module according to a time sequence signal of the second half period of power supply, or respectively controlling the second conversion unit, the first rectification circuit module, the fourth conversion unit and the second rectification circuit module according to a control time sequence of charging a low-voltage battery pack by a high-voltage battery pack.
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 periodic signal, so as to gate the first resonance circuit module or the second resonance circuit module, so that the signal output by the resonance circuit module to the conversion circuit module is a steamed bread wave, therefore, a large capacity electrolytic capacitor is not required for filtering, only a small capacity capacitor, such as a thin film capacitor, is used, the cost and volume of the electrolytic capacitor portion are reduced, the reliability and life of the system are improved, and, by the first rectifier circuit module and the second rectifier circuit module, the charging of the high-voltage battery pack to the low-voltage battery pack can be realized, the first resonant circuit module and the second resonant circuit module multiplex the second conversion unit, the number of used circuit devices can be reduced, and the cost is reduced.
In order to solve the above problem, a vehicle according to an embodiment of the second aspect of the present invention includes a high-voltage battery pack, a low-voltage battery pack, and the vehicle-mounted charging system.
According to the vehicle provided by the embodiment of the invention, by adopting the vehicle-mounted charging system provided by the embodiment of the invention, the cost can be reduced, the reliability is improved, the anti-seismic grade is improved, and the charging of the low-voltage battery pack can be realized at the same time.
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 schematic diagram of a resonant circuit output electrical signal waveform according to one embodiment of the present invention;
fig. 4 is a functional block diagram of an in-vehicle charging system according to another embodiment of the present invention;
fig. 5 is a circuit diagram of an in-vehicle charging system according to an embodiment of the invention;
FIG. 6 is a block diagram of a vehicle according to one embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
An in-vehicle charging system according to an embodiment of the invention is described below with reference to fig. 2 to 5.
Fig. 2 is a block diagram of an in-vehicle charging system according to an embodiment of the present invention, and as shown in fig. 2, the in-vehicle charging system 100 of an embodiment of the present invention includes a first resonant circuit module 10, a second resonant circuit module 20, a gate circuit module 30, a first rectifier circuit module 80, a second rectifier circuit module 81, and a control module 50.
Wherein a first terminal of the gate module 30 is connected to a first terminal of the electrical unit 60, and a second terminal of the gate module 30 is connected to a second terminal of the electrical unit 60. In an embodiment of the present invention, the electrical unit may be a power grid or an electrical load, i.e. when the electrical unit is a power grid, to achieve a charging operation, or when the electrical unit is an electrical load, to achieve a power battery discharging operation.
The first resonant circuit module 10 is used for performing conversion processing on an input electrical signal, and the first resonant circuit module 10 includes a first conversion unit 11, a first transformer T1 and a second conversion unit 12, in an embodiment, the first conversion unit 11 may be used for performing conversion between alternating current and alternating current, so as to implement conversion of an alternating current positive half-cycle electrical signal; the second conversion unit 12 can realize conversion between ac and dc, and the first transformer T1 plays a role in signal isolation and transmission. A first terminal of the first converting unit 11 is connected to the first terminal of the electric unit 60, a second terminal of the first converting unit 11 is connected to the third terminal of the gate circuit module 30, a primary side of the first transformer T1 is connected to the first converting unit 11, and a secondary side of the first transformer T1 is connected to the second converting unit 12.
The second resonant circuit module 20 is configured to perform a conversion process on an input electrical signal, and the second resonant circuit module 20 includes a third conversion unit 21, a second transformer T2, and a second conversion unit 12, where in an embodiment, the third conversion unit 21 may be configured to perform conversion between ac and ac, so as to implement conversion of an ac negative half-cycle electrical signal; the second transformer T2 plays the role of signal isolation and transmission. The first terminal of the third converting unit 21 is connected to the second terminal of the electrical unit 60, the second terminal of the third converting unit 21 is connected to the fourth terminal of the gating circuit module 30, the primary side of the second transformer T2 is connected to the third converting unit 21, and the secondary side of the second transformer T2 is connected to the secondary side of the first transformer T1 and the second converting unit 12, respectively.
The first resonant circuit module 10 and the second resonant circuit module 20 multiplex the second conversion unit 12, so that the number of switching tubes used by circuit devices can be reduced, and the cost is reduced.
The first end of the first rectifier circuit module 80 is connected to the secondary side of the first transformer T1, and is configured to rectify an input electrical signal, so that the rectified electrical signal can be provided to the low-voltage battery pack, so as to charge the low-voltage battery pack. The first end of the second rectifier circuit module 81 is connected to the secondary side of the second transformer T2, and is configured to rectify an input electrical signal, so that the rectified electrical signal can be provided to the low-voltage battery pack, so as to charge the low-voltage battery pack.
The control module 50 is configured to control the gating circuit module 30 to gate the first resonant circuit module 10 during a first half cycle of the power supply, and to control the first resonant circuit module 10 and the first rectifying circuit module 80 according to a timing signal during the first half cycle of the power supply, or to control the gating circuit module 30 during a second half cycle of the power supply, to gate the second resonant circuit module 20, and to control the second resonant circuit module 20 and the second rectifying circuit module 81 according to a timing signal during the second half cycle of the power supply. Alternatively, when the high-voltage battery pack charges the low-voltage battery pack, the control module 50 is configured to control the second conversion unit 12, the first rectifier circuit module 80, and the second rectifier circuit module 81 according to a charging control sequence.
In particular, when charging, the electrical unit 60 may be a power grid, and the control module 50 detects information of a period of the alternating current output by the power grid, and outputs a first gate control signal during a first half period, e.g., a positive half period, of the power supply, the gate circuit module 30 receives the first gate control signal, the corresponding switch tube is conducted to control the second end of the first resonant circuit module 10 to be connected with the second end of the power grid, at this time, the power grid supplies power to the first resonant circuit module 10, the control module 50 controls the first resonant circuit module 10 and the first rectifying circuit module 80 according to the timing signal of the first half cycle of the power supply, the first conversion unit 11 transmits the electric signal of the positive half cycle of the power grid to the first transformer T1, the alternating voltage is isolated and transmitted through the first transformer T1, and is converted into direct voltage through the second conversion unit 12, and the direct voltage is input to a rear-stage circuit to charge the high-voltage battery pack.
Similarly, when the control module 50 detects a second half period of power supply, for example, an electrical signal of a negative half period, it outputs a second gating control signal, the gating circuit module 30 receives the second gating control signal, its 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 and the second rectifying circuit module 81 according to the timing signal of the second half period of power supply, the third conversion unit 21 converts the signal of the negative half period of the power grid into an ac voltage, and performs isolation and transmission through the second transformer T2, and provides the ac voltage to the second conversion unit 12, and the second conversion unit 12 converts the ac voltage into a dc signal, which is input to a subsequent circuit to charge the high-voltage battery pack.
As shown in fig. 3, the electrical signal provided by the power grid 50 is as shown in (a) of fig. 3, and during the positive half-cycle, the control module 50 controls the gating circuit module 30 to conduct at the corresponding switching tube to gate the first resonant circuit module 10, the electrical signal input to the first resonant circuit module 10 is as shown in (b) of fig. 3, and the electrical signal output by the first resonant circuit module 10 is as shown in (d) of fig. 3. And, during the negative half cycle, the control module 50 controls the corresponding switch tube in the gating circuit module 30 to conduct and gate the second resonant circuit module 20, the input electrical signal of the second resonant circuit module 20 is shown in (c) of fig. 3, the output electrical signal of the second resonant circuit module 20 is shown in (e) of fig. 3, the waveform of the electrical signal provided to the subsequent circuit, which is the combined electrical signal output by the first resonant circuit module 10 and the second resonant circuit module 20, is shown in (f) of fig. 3, that is, the electrical signal provided to the subsequent circuit is a steamed bread wave, and similarly, the electrical signals provided to the subsequent circuit by the first rectifier circuit module 80 and the second rectifier circuit module 81 are also steamed bread waves, therefore, the post-stage circuit does not need to adopt a large-capacity electrolytic capacitor for filtering, and only needs to adopt a small-capacity capacitor device such as a film capacitor for filtering, so that the cost and the system volume can be reduced.
And, when the high voltage battery pack is discharged, when a positive half cycle is output, the first resonance circuit module 10 is gated, and the direct current output from the high voltage battery pack is converted into an alternating current signal of a positive half cycle by the first resonance circuit module 10 and supplied to the electrical unit 60, for example, an electrical load. When the negative half cycle is output, the second resonant circuit module 20 is gated, and the direct current output by the high-voltage battery pack is converted into an alternating current signal with the negative half cycle through the second resonant circuit module 20 and is provided to the electric load, so that the discharge mode of the high-voltage battery pack is realized.
And, in the embodiment of the present invention, the charging of the high-voltage battery pack to the low-voltage battery pack can also be realized by combining the first resonant circuit module 10 and the second resonant circuit module 20, and the first rectifier circuit module 80 and the second rectifier circuit module 81. Specifically, the control module 50 controls the second conversion unit 12, the first rectification circuit module 80, and the second rectification circuit module 81 according to the control timing of the high-voltage battery pack charging the low-voltage battery pack. The high voltage dc provided by the high voltage battery pack may be converted into ac power by the second conversion unit 12, and transmitted to the secondary sides of the first transformer T1 and the second transformer T2, provided to the first rectifier circuit module 80 by the secondary side of the first transformer T1, provided to the second rectifier circuit module 80 by the secondary side of the second transformer T2, and the control module 50 controls the switching tubes of the first rectifier circuit module 80 and the second rectifier circuit module 81 to rectify and convert the ac power into dc power to be provided to the low voltage battery pack, thereby implementing the charging of the low voltage battery pack by the high voltage battery pack.
According to the vehicle-mounted charging system 100 of the embodiment of the invention, the gating circuit module 30 is arranged to gate the resonant circuit modules according to the power supply period, the control module 50 controls the first resonant circuit module 10 and the second resonant circuit module 20 according to the time sequence of the corresponding power supply period, and controls the first rectifying circuit module 80 and the second rectifying circuit module 81 according to the power supply period, so that the direct current signals provided by the resonant circuit modules and the rectifying circuit modules to the rear-stage circuit are steamed waves, thereby a large-capacity filter device is not needed, a small-capacity filter device is used, the system volume and cost can be reduced, the problems of electrolytic capacitor life and shock resistance are not needed to be considered, the stability of the charging system is favorably provided, and the first rectifying circuit module 80 and the second rectifying circuit module 81 are also designed, the charging of the low-voltage battery pack can be realized simultaneously, and the first resonant circuit module 10 and the second resonant circuit module 20 multiplex the second conversion unit 12, so that the usage amount of circuit devices can be reduced, and the cost can be reduced.
Further, as shown in fig. 4, which is a block diagram of an in-vehicle charging system according to another embodiment of the present invention, as shown in fig. 4, the in-vehicle charging system 100 further includes a first dc conversion circuit module 40 and a second dc conversion circuit module 41, where the first dc conversion circuit module 40 is configured to perform dc conversion on an input electrical signal, for example, reduce a dc voltage or boost a dc voltage, and implement power factor correction. In some embodiments, the dc conversion circuit module 40 may employ a BOOST circuit or a BUCK circuit. The first dc conversion circuit module 40 is respectively connected to the second conversion unit 12 and the high-voltage battery pack 70, and is configured to perform dc-dc conversion on the input electrical signal. The second dc conversion circuit module 41 is connected to the first rectifier circuit module 80, the second rectifier circuit module 81, and the low-voltage battery pack 71, respectively, and is configured to perform dc-dc conversion on the input electrical signal, so as to convert the input dc signal into an electrical signal required by the low-voltage battery pack 71, and charge the low-voltage battery pack 71.
Specifically, during the first half cycle of the power supply, the first resonant circuit module 10 outputs a dc signal to the first dc conversion circuit module 40 to charge the high-voltage battery pack 70, or during the second half cycle of the power supply, the second resonant circuit module 20 outputs a dc signal to the first dc conversion circuit module 40 to charge the high-voltage battery pack 70. The first dc conversion circuit module 40 converts the input dc electrical signal into an electrical signal required by the high voltage battery pack 70, and transmits the electrical signal to the high voltage battery pack 70, thereby charging the high voltage battery pack 70. Or, when the high-voltage battery pack 70 is discharged, during a positive half period, the first resonant circuit module 10 is gated, the first dc conversion circuit module 40 converts the dc power of the high-voltage battery pack 70 and outputs the dc power to the electric load through the first resonant circuit module 10, and during a negative half period, the second resonant circuit module 10 is gated, the first dc conversion circuit module 40 converts the dc power of the high-voltage battery pack 70 and outputs the dc power to the electric load through the second resonant circuit module 20.
In the vehicle-mounted charging system 100 according to the embodiment of the invention, the dc conversion circuit module is disposed at the rear, so that the charging voltage or the charging power output to the battery pack can be adjusted by controlling the duty ratio of the dc conversion circuit module, thereby widening the voltage range of the adaptive battery pack, and shortening the charging time of the battery pack and the charging efficiency of the battery pack.
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. 5 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. 5, the gating circuit module 30 includes a first switch Q1 and a second switch Q2. A first end of the first switching tube Q1 is connected to a first end of the electric unit 60, a second end of the first switching tube Q1 is connected to a second end of the first converting unit 11, and a control end of the first switching tube Q1 is connected to the control module 50; a first terminal of the second switching tube Q2 is connected to the second terminal of the electric unit 60, a second terminal of the second switching tube Q2 is connected to the second terminal of the third converting unit 21, and a control terminal of the second switching tube Q2 is connected to the control module 50.
Specifically, the switching timing of the control module 50 for the gating circuit module 30 is that, during the positive half-cycle of the supply voltage, the first switching tube Q1 is turned on, and the second switching tube Q2 is turned off, so as to gate the first resonant circuit module 10; during the negative half-cycle of the supply voltage, the first switching transistor Q1 is turned off and the second switching transistor Q2 is turned on, gating the second resonant circuit module 20. Therefore, different resonant circuit modules are gated according to the power supply periodic signal, so that the voltage signals output by the resonant circuit modules are in the same direction, namely, the steamed bread wave information is output to the 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. 5, the first conversion unit 11 includes a first capacitor C1, a third switching tube Q3, a fourth switching tube Q4, a second capacitor C2, and a third capacitor C3; the second conversion unit 12 comprises a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7 and an eighth switching tube Q8; the third converting unit 21 includes an eighth capacitor C8, a ninth switch Q9, a tenth switch Q10, a ninth capacitor C9, and a tenth capacitor C10.
A first terminal of the first capacitor C1 is connected to the first terminal of the electrical unit 60, and a second terminal of the first capacitor C1 is connected to the second terminal of the first switch Q1. The first capacitor C1 can filter the input electrical signal to reduce the electrical signal interference.
A first terminal of a third switching tube Q3 is connected to a first terminal of a first capacitor C1, a control terminal of a third switching tube Q3 is connected to the control module 50, a second terminal of the third switching tube Q3 is connected to a first terminal of a fourth switching tube Q4, a second terminal of a fourth switching tube Q4 is connected to a second terminal of the first capacitor C1, a control terminal of the fourth switching tube Q4 is connected to the control module 50, and a first node O1 is located between the second terminal of the third switching tube Q3 and the first terminal of the fourth switching tube Q4. A first terminal of the second capacitor C2 is connected to the first terminal of the third switch Q3, a second terminal of the second capacitor C2 is connected to the first terminal of the third capacitor C3, a second terminal of the third capacitor C3 is connected to the second terminal of the fourth switch Q4, and a second node O2 is located between the second terminal of the second capacitor C2 and the first terminal of the third capacitor C3.
The first transformer T1 includes a first winding W1 and a second winding W2, a first terminal of the first winding W1 is connected to a first node O1 through a first inductance L1, and a second terminal of the first winding W1 is connected to a second node O2.
A first terminal of the eighth capacitor C8 is connected to the second terminal of the electrical unit 60, and a second terminal of the eighth capacitor C8 is connected to the second terminal of the second switch Q2.
A first end of the ninth switching tube Q9 is connected to a first end of the eighth capacitor C8, a control end of the ninth switching tube Q9 is connected to the control module 50, a second end of the ninth switching tube Q9 is connected to a first end of the tenth switching tube Q10, a second end of the tenth switching tube Q10 is connected to a second end of the eighth capacitor C8, a control end of the tenth switching tube Q10 is connected to the control module 50, and a sixth node O6 is provided between the second end of the ninth switching tube Q9 and the first end of the tenth switching tube Q10.
A first terminal of the ninth capacitor C9 is connected to the first terminal of the ninth switch transistor Q9, a second terminal of the ninth capacitor C9 is connected to the first terminal of the tenth capacitor C10, a second terminal of the tenth capacitor C10 is connected to the second terminal of the tenth switch transistor Q10, and a seventh node O7 is located between the second terminal of the ninth capacitor C9 and the first terminal of the tenth capacitor C10.
The second transformer T2 includes a fifth winding W5 and a sixth winding W6, a first end of the fifth winding W5 is connected to the sixth node O4 through a fifth inductor L5, a second end of the fifth winding W5 is connected to the seventh node O7, and a first end of the sixth winding W6 is connected to a second end of the second winding W2 through a fifteenth capacitor C15. .
A first end of the fifth switching tube Q5 is connected to the first end of the first dc converting 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 first dc converting circuit module 40, a control end of the sixth switching tube Q6 is connected to the control module 50, a third node O3 is located 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 L2.
A first end of a seventh switching tube Q7 is connected to a first end of a fifth switching tube Q5 and a first end of a first dc converting circuit module 40, a second end of a seventh switching tube Q7 is connected to a first end of an eighth switching tube Q8, a second end of the eighth switching tube Q8 is connected to a first end of a sixth switching tube Q6 and a second end of the first dc converting circuit module 40, a fourth node O4 is arranged between the second end of the seventh switching tube Q7 and the first end of the eighth switching tube Q8, and the fourth node O4 is connected to a second end of the sixth coil W6.
Specifically, when the grid voltage is a positive half-cycle during charging of the high-voltage battery pack 70, the first switching tube Q1 is turned on, the second switching tube Q2 is turned off, and the first resonant circuit module 10 is gated; the grid voltage is applied to the first capacitor C1, the control module 50 turns on or off the third switching tube Q3 and the fourth switching tube Q4 at a fixed frequency and a fixed duty cycle, and the second capacitor C2 and the third capacitor C3 are charged or discharged, so that an alternating voltage is formed between a midpoint of the third switching tube Q3 and the fourth switching tube Q4, i.e., the first node O1, and a midpoint of the second capacitor C2 and the third capacitor C3, i.e., the second node O2. After being isolated by the first transformer T1, the rectifying circuit composed of the fifth switching tube Q5, the sixth switching tube Q6, the fourth capacitor C4 and the fifth capacitor C5 converts the alternating-current 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-current voltage to be output, i.e., the voltage provided to the first direct-current conversion circuit module 40, by controlling the on or off of the fifth switching tube Q5 and the sixth switching tube Q6, and charging or discharging the fourth capacitor C4 and the fifth capacitor C5, so as to realize the alternating-direct-current conversion.
As shown in fig. 5, the first dc conversion circuit module 40 includes a sixth capacitor C6, an eleventh switch Q11, a twelfth switch Q12, and a seventh capacitor C7.
A first end of the sixth capacitor C6 is connected to the first end of the seventh switch tube Q7, and a second end of the sixth capacitor C6 is connected to the second end of the eighth switch tube Q8; the sixth capacitor C6 is used to filter the input dc signal, and in the embodiment of the present invention, the sixth capacitor C6 is a capacitor device with a small capacitance, such as a thin film capacitor, and an electrolytic capacitor with a large capacitance is not needed.
A first end of an eleventh switching tube Q11 is connected to the first end of the high-voltage battery pack 70, a control end of the eleventh switching tube Q11 is connected to the control module 50, a second end of an eleventh switching tube Q11 is connected to the first end of a twelfth switching tube Q12, a second end of the twelfth switching tube Q12 is connected to the second end of the sixth capacitor C6 and the second end of the high-voltage battery pack 70, respectively, a control end of a twelfth switching tube Q12 is connected to the control module 50, a fifth node O5 is located between the second end of the eleventh switching tube Q11 and the first end of the twelfth switching tube Q12, and the fifth node O5 is connected to 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 eleventh switch tube Q11 and the first end of the high-voltage battery pack 70, respectively, and a second end of the seventh capacitor C7 is connected to the second end of the twelfth switch tube Q12 and the second end of the high-voltage battery pack 70, respectively.
In the present embodiment, the first dc conversion circuit module 40 is disposed at the rear, so that the charging voltage or the charging power output to the high-voltage battery pack 70 can be adjusted by controlling the duty ratio of the conversion circuit module 40, 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 high-voltage battery pack 70.
Specifically, when the grid voltage is a negative half-cycle during charging of the high-voltage 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 switch Q9 and the tenth switch Q10 to be turned on or off at a fixed frequency and a fixed duty ratio, and charges or discharges the ninth capacitor C9 and the tenth capacitor C10, so that an alternating voltage is formed between a midpoint of the ninth switch Q9 and the tenth switch Q10, i.e., the sixth node O6, and a midpoint of the ninth capacitor C9 and the tenth capacitor C10, i.e., the seventh node O7. After being isolated by the second transformer T2, the rectifying circuit composed of the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 converts the ac voltage between the midpoint of the fifth switching tube Q5 and the sixth switching tube Q6, i.e., the third node O3, and the midpoint of the seventh switching tube Q7 and the eighth switching tube Q8, i.e., the fourth node O4, into the dc voltage output, i.e., the voltage provided to the first dc conversion circuit module 40, i.e., the voltage across the sixth capacitor C6, by controlling the on/off of the fifth switching tube Q5 and the sixth switching tube Q6, and charging or discharging the seventh switching tube Q7 and the eighth switching tube Q8, so as to realize ac-dc conversion.
The voltage on the sixth capacitor C6 is proportional to the absolute value of the grid voltage, and the voltage waveform is the output voltage waveform of the steamed bread wave by gating the first resonant circuit module 10 and the second resonant circuit module 20, so that a large-capacity electrolytic capacitor is not needed for filtering, and a small-capacity capacitor, such as a film capacitor, can be selected as the sixth capacitor C6.
Further, the first dc conversion circuit module 40 regulates the input dc voltage to supply to the high voltage battery pack 70. Specifically, when the twelfth switching tube Q12 is turned on, the current of the third inductor L3 increases, and as shown in fig. 5, the current flows in a → L3 → Q12 → B; the twelfth switching tube Q12 is turned off, and the current of the third inductor L3 decreases, as shown in fig. 5, the current flows in a → L3 → Q11 → battery pack → B. The twelfth switching tube Q12 is controlled by the control module 50 to be turned on or off at a high frequency, so that the current waveform of the third inductor L3 tracks the voltage of the sixth capacitor C6, and 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. 5, the vehicle-mounted charging system can also operate in the discharging mode of the high-voltage battery pack 70, that is, the high-voltage 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 high-voltage battery pack 70 discharges to output direct current, the first direct current conversion circuit module 40 performs direct current-direct current conversion to realize a voltage regulation function, and the control module 50 controls two switching tubes in the gating circuit module 30 to gate according to the power supply period signal so as to gate the first resonance circuit module 10 or the second resonance circuit module 20 and output power frequency alternating current to supply power for the power consumption equipment or feed back to a power grid.
Referring to fig. 5, specifically, the switching timing sequence of the first dc conversion circuit module 40 is as follows: when the eleventh switch tube Q11 is turned on, the current of the third inductor L3 rises, and the high-voltage battery pack 70 transfers energy to the rear-stage circuit; when the eleventh switch Q11 is turned off, the current of the third inductor L3 drops, and then flows through the twelfth switch Q12, and energy is transferred to the subsequent stage. The control module 50 regulates the output voltage, i.e., the voltage across the sixth capacitor C6, by controlling the eleventh switch Q11 to turn on and off, and the voltage amplitude depends on the switching duty cycle of the eleventh switch Q11 and the voltage of the high-voltage battery pack 70.
For the first resonant circuit module 10 and the second resonant circuit module 20, the first resonant circuit module 10 is gated on outputting a positive half cycle of the alternating current. Specifically, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 are turned on or off at a fixed frequency and a fixed duty ratio, and an alternating voltage is formed between the midpoint of the fifth switching tube Q5 and the sixth switching tube Q6, i.e., the third node O3, the seventh switching tube Q7 and the eighth switching tube Q8, i.e., the fourth node O4. After the isolation of the first transformer T1, the third switching tube Q3, the fourth switching tube Q4, the second capacitor C2 and the third capacitor C3 realize a rectification function, and through the on or off of the third switching tube Q3 and the fourth switching tube Q4 and the charging or discharging of the second capacitor C2 and the third capacitor C3, the alternating current voltage between the middle points of the third switching tube Q3 and the fourth switching tube Q4, i.e., the first node O1 and the second capacitor C2, and the middle point of the third capacitor C3, i.e., the second node O2, is converted into a positive half-cycle part of the power frequency, i.e., the voltage at two ends of the first capacitor C1, so that the positive half-cycle part output of the power frequency alternating current is realized.
Likewise, the second resonant circuit module 20 is gated on the negative half-cycle of the alternating current output by the system. The fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 are turned on or off at a fixed frequency and a fixed duty ratio, and an alternating voltage is formed between a third node O3, which is a midpoint between the fifth switching tube Q5 and the sixth switching tube Q6, and a fourth node O4, which is a midpoint between the seventh switching tube Q7 and the eighth switching tube Q8. After the transformation and isolation of the second transformer T2, the ninth switching tube Q9, the tenth switching tube Q10, the ninth capacitor C9 and the tenth capacitor C10 realize a rectification function, and through the conduction or the disconnection of the ninth switching tube Q9 and the tenth switching tube Q10 and the charging or the discharging of the ninth capacitor C9 and the eleventh capacitor C10, the alternating current voltage between the midpoint of the ninth switching tube Q9 and the tenth switching tube Q10, i.e., the seventh node O7, and the midpoint of the ninth capacitor C9 and the tenth capacitor C10, i.e., the sixth node O6, is converted into the negative half-cycle of the power frequency alternating current, i.e., the voltage at two ends of the eighth capacitor C8, so as to realize the negative half-cycle output of the power frequency alternating current.
The switching timing for the gating circuit module 30 is: when the system outputs a positive half-cycle signal of alternating current, the first switching tube Q1 is switched on, the second switching tube Q2 is switched off, and the first resonant circuit module 10 is switched on; when the system outputs a signal of a negative half cycle of the alternating current, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, and the second resonant circuit module 20 is gated.
Further, as shown in fig. 5, the secondary side of the first transformer T1 further includes a third coil W3 and a fourth coil W4, a second end of the third coil W3 and a first end of the fourth coil W4 are a first common end, and the first common end is connected to the first end of the second dc conversion circuit module 41.
The first rectifier circuit module 80 includes a thirteenth switching tube Q13 and a fourteenth switching tube Q14, wherein a first end of the thirteenth switching tube Q13 is connected to the first end of the third winding W3, a second end of the thirteenth switching tube Q13 is connected to the second end of the second dc converting circuit module 41, a control end of the thirteenth switching tube Q13 is connected to the control module 50, a first end of the fourteenth switching tube Q14 is connected to the second end of the fourth winding W4, a second end of the fourteenth switching tube Q14 is connected to the second end of the second dc converting circuit module 41, and a control end of the fourteenth switching tube Q14 is connected to the control module 50.
The secondary side of the second transformer T2 further includes a seventh coil W7 and an eighth coil W8, wherein a second terminal of the seventh coil W7 and a first terminal of the eighth coil W8 are a second common terminal, and the second common terminal is connected to the first terminal of the second dc conversion circuit module 41.
The second rectifying circuit module 41 includes a fifteenth switching tube Q15 and a sixteenth switching tube Q16, a first end of the fifteenth switching tube Q15 is connected to the first end of the seventh winding W7, a second end of the fifteenth switching tube Q15 is connected to the second end of the second dc conversion circuit module 41, a control end of the fifteenth switching tube Q15 is connected to the control module 50, a first end of the sixteenth switching tube Q16 is connected to the second end of the eighth winding W8, a second end of the sixteenth switching tube Q16 is connected to the second end of the second dc conversion circuit module 41, and a control end of the sixteenth switching tube Q16 is connected to the control module 50.
Further, the second dc conversion circuit module 41 includes a thirteenth capacitor C13, a seventeenth switch Q17, an eighteenth switch Q18 and a fourteenth capacitor C14.
A first end of the thirteenth capacitor C13 is connected to the first common terminal, and a second end of the thirteenth capacitor C13 is connected to the second end of the thirteenth switching tube Q13, the second end of the fourteenth switching tube Q14, the second end of the fifteenth switching tube Q15, and the second end of the sixteenth switching tube Q16, respectively.
A first end of a seventeenth switching tube Q17 is connected to the first end of the thirteenth capacitor C13 through a fourth inductor L4, a second end of the seventeenth switching tube Q17 is connected to the second end of the thirteenth capacitor C13 and the first end of the low-voltage battery pack 71, a control end of the seventeenth switching tube Q17 is connected to the control module 50, a first end of an eighteenth switching tube Q18 is connected to the fourth inductor L4 and the first end of the seventeenth switching tube Q17, a second end of the eighteenth switching tube Q18 is connected to the second end of the low-voltage battery pack 71, and a control end of the eighteenth switching tube Q18 is connected to the control module 50.
A first end of the fourteenth capacitor C14 is connected to the second end of the eighteenth switch tube Q18 and the second end of the low-voltage battery pack 71, respectively, and a second end of the fourteenth capacitor C14 is connected to the second end of the seventeenth switch tube Q17 and the first end of the low-voltage battery pack 71, respectively.
Based on the in-vehicle charging system shown in fig. 5, it is also possible to operate in a mode in which the high-voltage battery pack 70 charges the low-voltage battery pack 71. In this mode, the first dc conversion circuit 40, the secondary part of the first resonance circuit module 10, the secondary part of the second resonance circuit module 20, the first and second rectifier circuit modules 80 and 81, and the second dc conversion circuit module 41 participate.
Specifically, when the eleventh switching tube Q11 is turned on, the current of the third inductor L3 rises, and the high-voltage battery pack 70 transfers energy to the rear-stage circuit; when the eleventh switch Q11 is turned off, the current of the third inductor L3 drops, and then flows through the twelfth switch Q12, and energy is transferred to the subsequent stage. The first dc conversion circuit module 40, for example, the buck circuit outputs a voltage across the sixth capacitor C6, and the voltage across the sixth capacitor C6 can be adjusted by adjusting the duty ratio of the eleventh switch Q11.
By controlling the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 to be turned on or off at a certain frequency and duty ratio, an alternating current voltage is formed between a midpoint of the fifth switching tube Q5 and the sixth switching tube Q6, namely the third node O3, and a midpoint of the seventh switching tube Q7 and the eighth switching tube Q8, namely the fourth node O4, and the alternating current-alternating current conversion and the isolation are realized through the isolation of the secondary side of the first transformer T1. The secondary part of the first transformer T1 is connected in parallel with the secondary part of the second transformer T2, the starting operation time of the secondary part of the second transformer T2 is delayed from the starting operation time of the secondary part of the first transformer T1, the operation process is the same, and ac-ac conversion and isolation are realized through isolation on the secondary side of the second transformer T2.
Further, the first rectifier circuit module 80 and the second rectifier circuit module 81 convert the ac voltages of the third coil W3, the fourth coil W4 of the first transformer T1, and the seventh coil W7 and the eighth coil W8 of the second transformer T2 into dc voltages, and when the third coil W3 and the fourth coil W4 are positive and negative, the fourteenth switching tube Q14 is turned on, and the thirteenth switching tube Q13 is turned off, and outputs the dc voltages; when the third coil W3 and the fourth coil W4 are turned on and off, the fourteenth switching tube Q14 is not turned on, and the thirteenth switching tube Q13 is turned on, thereby outputting a dc voltage. The second rectifier circuit module 81 starts operating at a time delayed from the time of the first rectifier circuit module 80, and the operation is the same. When the seventh coil W7 and the eighth coil W8 are positive and negative, the sixteenth switching tube Q16 is turned on, the fifteenth switching tube Q15 is turned off, and a direct-current voltage is output; when the seventh coil W7 and the eighth coil W8 are up-down negative and positive, the sixteenth switching tube Q16 is not conducted, the fifteenth switching tube Q15 is conducted, and outputs a direct-current voltage to the low-voltage battery pack 71, so that the high-voltage battery pack 70 charges the low-voltage battery pack 71. In this operating mode, in the second dc conversion circuit module 41, the seventeenth switching tube Q17 is kept off, and the eighteenth switching tube Q18 is kept on.
In the embodiment of the present invention, when the high-voltage battery pack 70 discharges to the low-voltage battery pack 71, the two output current ripples are alternately superimposed to charge the low-voltage battery pack 71 through the relative delay of the operating time of the first rectifier circuit module 80 and the second rectifier circuit module 81, so that the current ripples are reduced, and the charging efficiency is improved.
In the embodiment of the present invention, the switching tube may be a MOS tube or a triode or other suitable switching device.
In addition, for the Part of Part 2' in fig. 1, which is an LLC topology, when the output voltage range is wide, the switching frequency deviates from the resonant frequency more, resulting in low charging efficiency. The vehicle-mounted charging system 100 according to the embodiment of the invention can adjust the duty ratio of the operation of the dc conversion circuit module at the rear stage through the control module 50 to control the charging power, and the adaptable battery voltage range is wider.
In summary, in the vehicle-mounted charging system 100 according to the embodiment of the present invention, the gating circuit module 30 and the two resonant circuit modules are arranged, and the control module 50 controls the gating circuit module 30 according to the power supply period 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 needed for filtering, and only a small-capacity filter device, such as a thin film capacitor, is used, so that the cost and the volume of the electrolytic capacitor portion are reduced, and the reliability and the service life of the product are improved. And, the arrangement of the first rectifier circuit module 80 and the second rectifier circuit module 81 can realize the charging of the high-voltage battery pack 70 to the low-voltage battery pack 71, and due to the delay of the rectification operating time, the current ripple can be reduced, and the charging efficiency can be improved, and the first resonant circuit module 10 and the second resonant circuit module 20 multiplex the second conversion unit 12, which can reduce the usage amount of circuit devices, reduce the cost, and, through the adjustment of the operating duty ratio of the dc conversion circuit module, can adapt to a larger battery voltage range, providing the charging power.
Based on the on-vehicle charging system of the above embodiment, a vehicle according to an embodiment of the second aspect of the invention is described below with reference to the drawings.
FIG. 6 is a block diagram of a vehicle according to one embodiment of the present invention. As shown in fig. 6, a vehicle 1000 according to an embodiment of the present invention includes a high-voltage battery pack 70, a low-voltage battery pack 71, and the vehicle-mounted charging system 100 according to the above embodiment, wherein the components of the vehicle-mounted 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 above embodiment, the cost can be reduced, the reliability can be improved, the anti-seismic grade can be improved, and the charging of the high-voltage battery pack to the low-voltage battery pack can be realized.
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 (10)
1. An in-vehicle charging system, characterized by comprising:
the first end of the gating circuit module is connected with the first end of the electric unit, and the second end of the gating circuit module is connected with the second end of the electric unit;
the first resonant circuit module is used for converting an input electric signal and comprises a first conversion unit, a first transformer and a second conversion unit, wherein the first end of the first conversion unit is connected with the first end of the electric unit, the second end of the first conversion unit is connected with the third end of the gating circuit module, the primary side of the first transformer is connected with the first conversion unit, and the secondary side of the first transformer is connected with the second conversion unit;
the second resonant circuit module is used for converting an input electrical signal, and comprises a second conversion unit, a third conversion unit and a second transformer, wherein a first end of the third conversion unit is connected with a second end of the electrical unit, a second end of the third conversion unit is connected with a fourth end of the gating circuit module, a primary side of the second transformer is connected with the third conversion unit, and a secondary side of the second transformer is connected with a secondary side of the first transformer;
the first end of the first rectifying circuit module is connected with the secondary side of the first transformer and used for rectifying an input electric signal;
a second rectifier circuit module, a first end of which is connected to a secondary side of the second transformer, for rectifying an input electrical signal;
and the control module is used for controlling the gating circuit module during a first half period of power supply to gate the first resonant circuit module and control the first resonant circuit module according to a time sequence signal of the first half period of power supply, or controlling the gating circuit module during a second half period of power supply to gate the second resonant circuit module and control the second resonant circuit module according to a time sequence signal of the second half period of power supply, or respectively controlling the second conversion unit, the first rectifying circuit module and the second rectifying circuit module according to a control time sequence of charging a low-voltage battery pack by a high-voltage battery pack.
2. The vehicle-mounted charging system according to claim 1, further comprising:
the first direct current conversion circuit module is respectively connected with the second conversion unit and the high-voltage battery pack and is used for performing direct current-direct current conversion on an input electric signal;
and the second direct current conversion circuit module is respectively connected with the first rectification circuit module, the second rectification circuit module and the low-voltage battery pack and is used for performing direct current-direct current conversion on an input electric signal.
3. The vehicle charging system of claim 2, wherein the gating circuit module comprises:
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 conversion unit, and a control end of the first switching tube is connected with the control module;
a first end of the second switching tube is connected with the first end of the electric unit, a second end of the second switching tube is connected with the second end of the third conversion unit, and a control end of the second switching tube is connected with the control module;
and when the power supply is carried out for the second half period, the first switching tube is controlled to be switched off, and the second switching tube is controlled to be switched on.
4. The vehicle-mounted charging system according to claim 3,
the first conversion unit comprises a first capacitor, a third switch tube, a fourth switch tube, a second capacitor and a third capacitor, the first end of the first capacitor is connected with the first end of the electric unit, the second end of the first capacitor is connected with the 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, a first node is arranged between the second end of the third switch tube and the first end of the fourth switch tube, and the first end of the second capacitor is connected with the first end of the third switch tube, a second end of the second capacitor is connected with a first end of a 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;
the third conversion unit comprises an eighth capacitor, a ninth switch tube, a tenth switch tube, a ninth capacitor and a tenth capacitor, wherein the first end of the eighth capacitor is connected with the second end of the electric unit, the second end of the eighth capacitor is connected with the second end of the second switch tube, the first end of the ninth switch tube is connected with the first end of the eighth capacitor, the control end of the ninth switch tube is connected with the control module, the second end of the ninth switch tube is connected with the first end of the tenth switch tube, the second end of the tenth switch tube is connected with the second end of the eighth capacitor, the control end of the tenth switch tube is connected with the control module, a sixth node is arranged between the second end of the ninth switch tube and the first end of the tenth switch tube, and the first end of the ninth capacitor is connected with the first end of the ninth switch tube, a second end of the ninth capacitor is connected with a first end of the tenth capacitor, a second end of the tenth capacitor is connected with a second end of the tenth switching tube, and a seventh node is arranged between the second end of the ninth capacitor and the first end of the tenth capacitor;
the second transformer comprises a fifth coil and a sixth coil, a first end of the fifth coil is connected with the sixth node through a fifth inductor, a second end of the fifth coil is connected with the seventh node, and a first end of the sixth coil is connected with a second end of the second coil through a fifteenth capacitor.
5. The vehicle-mounted charging system according to claim 4, wherein the second conversion unit includes:
a fifth switching tube and a sixth switching tube, wherein a first end of the fifth switching tube is connected with a first end of the first dc conversion circuit module, a control end of the fifth switching tube is connected with the control module, a second end of the fifth switching tube is connected with a first end of the sixth switching tube, a second end of the sixth switching tube is connected with a second end of the first dc conversion circuit module, a control end of the sixth switching tube is connected with the control module, a third node is arranged between the second end of the fifth switching tube and the first end of the sixth switching tube, and the third node is connected with the first end of the second coil through a second inductor;
the first end of the seventh switch tube is connected with the first end of the fifth switch tube and the first end of the first direct current conversion circuit module respectively, the second end of the seventh switch tube is connected with the first end of the eighth switch tube, the second end of the eighth switch tube is connected with the second end of the sixth switch tube and the second end of the first direct current conversion circuit module respectively, a fourth node is arranged between the second end of the seventh switch tube and the first end of the eighth switch tube, and the fourth node is connected with the second end of the sixth coil.
6. The vehicle-mounted charging system according to claim 5, wherein the first DC conversion circuit module comprises:
a first end of the sixth capacitor is connected with a first end of the seventh switching tube, and a second end of the sixth capacitor is connected with a second end of the eighth switching tube;
the first end of the eleventh switch tube is connected with the first end of the high-voltage battery pack, 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 respectively connected with the second end of the sixth capacitor and the second end of the high-voltage battery pack, the control end of the twelfth switch tube is connected with the control module, a fifth node is arranged between the second end of the eleventh switch tube and the first end of the twelfth switch 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 eleventh switch tube and the first end of the high-voltage battery pack respectively, and a second end of the seventh capacitor is connected with the second end of the twelfth switch tube and the second end of the high-voltage battery pack respectively.
7. The vehicle-mounted charging system according to claim 6,
the secondary side of the first transformer further comprises a third coil and a fourth coil, a second end of the third coil and a first end of the fourth coil are a first common end, and the first common end is connected with a first end of the second direct current conversion circuit module;
the first rectifying circuit module comprises a thirteenth switching tube and a fourteenth switching tube, wherein the first end of the thirteenth switching tube is connected with the first end of the third coil, the second end of the thirteenth switching tube is connected with the second end of the second direct current conversion circuit module, the control end of the thirteenth switching tube is connected with the control module, the first end of the fourteenth switching tube is connected with the second end of the fourth coil, the second end of the fourteenth switching tube is connected with the second end of the second direct current conversion circuit module, and the control end of the fourteenth switching tube is connected with the control module.
8. The vehicle-mounted charging system according to claim 7,
the secondary side of the second transformer further comprises a seventh coil and an eighth coil, wherein a second end of the seventh coil and a first end of the eighth coil are a second common end, and the second common end is connected with a first end of the second direct current conversion circuit module;
the second rectifying circuit module comprises a fifteenth switching tube and a sixteenth switching tube, wherein the first end of the fifteenth switching tube is connected with the first end of the seventh coil, the second end of the fifteenth switching tube is connected with the second end of the second direct current conversion circuit module, the control end of the fifteenth switching tube is connected with the control module, the first end of the sixteenth switching tube is connected with the second end of the eighth coil, the second end of the sixteenth switching tube is connected with the second end of the second direct current conversion circuit module, and the control end of the sixteenth switching tube is connected with the control module.
9. The vehicle-mounted charging system according to claim 8, wherein the second direct-current conversion circuit module includes:
a thirteenth capacitor, a first end of the thirteenth capacitor is connected to the first common terminal, and a second end of the thirteenth capacitor is connected to the second end of the thirteenth switching tube, the second end of the fourteenth switching tube, the second end of the fifteenth switching tube, and the second end of the sixteenth switching tube, respectively;
a seventeenth switching tube and an eighteenth switching tube, wherein a first end of the seventeenth switching tube is connected with a first end of the thirteenth capacitor through a fourth inductor, a second end of the seventeenth switching tube is respectively connected with a second end of the thirteenth capacitor and a first end of the low-voltage battery pack, a control end of the seventeenth switching tube is connected with the control module, a first end of the eighteenth switching tube is respectively connected with the fourth inductor and the first end of the seventeenth switching tube, and a second end of the eighteenth switching tube is connected with a second end of the low-voltage battery pack;
and a fourteenth capacitor, a first end of which is connected to the second end of the eighteenth switching tube and the second end of the low-voltage battery pack, respectively, and a second end of which is connected to the second end of the seventeenth switching tube and the first end of the low-voltage battery pack, respectively.
10. A vehicle comprising a high voltage battery pack, a low voltage battery pack, and an on-board charging system according to any one of claims 1-9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20180012566A (en) * | 2016-07-27 | 2018-02-06 | 주식회사 엘지화학 | System and method for balancing between a battery cell group using lc resonance |
| CN108183539A (en) * | 2017-12-26 | 2018-06-19 | 中国矿业大学 | Isolated bidirectional electric automobile charging system and its control method |
| CN207705877U (en) * | 2018-01-25 | 2018-08-07 | 辽宁工业大学 | A kind of automobile mounted charger of high efficiency motor |
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