CN110556901A - vehicle-mounted charging and discharging system - Google Patents
vehicle-mounted charging and discharging system Download PDFInfo
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- CN110556901A CN110556901A CN201910900675.4A CN201910900675A CN110556901A CN 110556901 A CN110556901 A CN 110556901A CN 201910900675 A CN201910900675 A CN 201910900675A CN 110556901 A CN110556901 A CN 110556901A
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- switch
- electrically connected
- conversion circuit
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- 238000007599 discharging Methods 0.000 title claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 262
- 239000003990 capacitor Substances 0.000 claims abstract description 89
- 230000002457 bidirectional effect Effects 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a vehicle-mounted charging and discharging system which comprises an alternating current/direct current conversion circuit. The second end of the AC/DC conversion circuit includes a first node, a second node, and a third node. The first capacitor is connected in series between the first node and the second node. The second capacitor is connected in series between the second node and the third node. The first dc/dc conversion circuit includes a fourth node, a fifth node, a sixth node, and a seventh node. The fourth node is electrically connected to the first node. The second dc/dc conversion circuit includes an eighth node, a ninth node, a tenth node, and an eleventh node. The eighth node is electrically connected to the fifth node. The ninth node is electrically connected to the third node. The tenth node is electrically connected with the seventh node; or the tenth node is electrically connected with the sixth node, and the eleventh node is electrically connected with the seventh node. The first terminal of the third dc/dc conversion circuit includes a twelfth node and a thirteenth node. The twelfth node is electrically connected with the first node. The thirteenth node is electrically connected to the third node.
Description
Technical Field
The application relates to the technical field of vehicle-mounted power supplies, in particular to a vehicle-mounted charging and discharging system.
background
Along with the continuous increase of the cruising ability of the electric automobile, the power of a vehicle-mounted charging and discharging system is increased, and the common power grades are 11KW and 22 KW. In terms of function realization, at present, most electric automobiles adopt a bidirectional vehicle-mounted charging and discharging system. The bidirectional vehicle charging/discharging system is generally composed of an alternating current/direct current (AC/DC) converter, a High Voltage (HV) direct current/direct current (DC/DC) converter, and a Low Voltage (LV) DC/DC converter.
Because the input power of the existing vehicle-mounted charging and discharging system is below 11kw, the AC/DC converter and the DC/DC converter can be realized by adopting a single stage. When the power is increased to 11kw or more than 11kw, the design difficulty of the magnetic element (especially the transformer) is increased by adopting the existing vehicle-mounted charging and discharging system circuit topology structure, and especially the heat and the volume of the transformer are difficult to optimize.
disclosure of Invention
Based on this, provide a vehicle-mounted charge-discharge system.
A vehicle-mounted charging and discharging system is electrically connected to a single-phase/three-phase power supply, and comprises:
the first end of the alternating current/direct current conversion circuit is electrically connected with the single-phase/three-phase power supply, and the second end of the alternating current/direct current conversion circuit comprises a first node, a second node and a third node;
a first capacitor, a first end of the first capacitor being electrically connected to the first node, a second end of the first capacitor being electrically connected to the second node;
A first end of the second capacitor is electrically connected with a second end of the first capacitor, and a second end of the second capacitor is electrically connected with the third node;
a first DC/DC conversion circuit, a first end of the first DC/DC conversion circuit (400) comprising a fourth node and a fifth node, the fourth node being electrically connected to the first node, a second end of the first DC/DC conversion circuit comprising a sixth node and a seventh node;
a second dc/dc conversion circuit, a first end of which includes an eighth node and a ninth node, the eighth node is electrically connected to the fifth node, the ninth node is electrically connected to the third node, a second end of which includes a tenth node and an eleventh node, the tenth node is electrically connected to the seventh node, or the tenth node is electrically connected to the sixth node, the eleventh node is electrically connected to the seventh node, and a terminal voltage between the eleventh node and the sixth node is a first voltage; and
and the first end of the third direct current/direct current conversion circuit comprises a twelfth node and a thirteenth node, the twelfth node is electrically connected with the first end of the first capacitor, the thirteenth node is electrically connected with the second end of the second capacitor, and the terminal voltage of the second end of the third direct current/direct current conversion circuit is a second voltage.
In one embodiment, the second voltage is less than the first voltage.
in one embodiment, the vehicle-mounted charging and discharging system further includes:
a first end of the third capacitor is electrically connected with the fourth node, and a second end of the third capacitor is electrically connected with a fifth node;
And a first end of the fourth capacitor is electrically connected with the eighth node, and a second end of the fourth capacitor is electrically connected with the ninth node.
In one embodiment, the first dc/dc conversion circuit includes:
A first switch, a first end of the first switch being electrically connected to the first node;
A second switch, a first end of the second switch being electrically connected to a first end of the first switch;
a third switch, a first end of the third switch being electrically connected to the second end of the first switch, a second end of the third switch being electrically connected to the eighth node;
a first end of the fourth switch is electrically connected with the second end of the second switch, and a second end of the fourth switch is electrically connected with the first end of the third switch;
a first resonant cavity, a first end of which includes a fourteen node and a fifteen node, a second end of which includes a sixteen node and a seventeen node, the fourteen node being electrically connected to a second end of the second switch and a first end of the fourth switch, respectively, and the fifteen node being electrically connected to a second end of the first switch and a first end of the third switch, respectively;
A fifth switch, a first end of which is electrically connected to the sixth node, and a second end of which is electrically connected to the sixteenth node;
a sixth switch, a first end of which is electrically connected to the sixth node, and a second end of which is electrically connected to the seventeen node;
A seventh switch, a first end of the seventh switch being electrically connected to the sixteen node, a second end of the seventh switch being electrically connected to the eleventh node;
a first end of the eighth switch is electrically connected to the seventeenth node, and a second end of the eighth switch is electrically connected to the eleventh node.
In one embodiment, at least one of the ac/dc conversion circuit, the first dc/dc conversion circuit, and the second dc/dc conversion circuit is a bidirectional conversion circuit.
in one embodiment, the third dc/dc conversion circuit is a bidirectional conversion circuit or a unidirectional conversion circuit.
In one embodiment, the first dc/dc conversion circuit and the second dc/dc conversion circuit have the same topology.
in one embodiment, the vehicle-mounted charging and discharging system further includes:
a first switch electrically connected between the seventh node and the eleventh node;
a second switch electrically connected between the seventh node and the tenth node;
a third switch electrically connected between the sixth node and the tenth node;
When the second end of the second direct current/direct current conversion circuit is connected with the second end of the first direct current/direct current conversion circuit in series, the second switch is closed, and the first switch and the third switch are opened;
And when the second end of the second direct current/direct current conversion circuit is connected with the second end of the first direct current/direct current conversion circuit in parallel, closing the first switch and the third switch and opening the second switch.
A vehicle-mounted charging and discharging system is electrically connected to a single-phase/three-phase power supply, and comprises:
The first end of the alternating current/direct current conversion circuit is electrically connected with the single-phase/three-phase power supply, and the second end of the alternating current/direct current conversion circuit comprises a first node, a second node and a third node;
a first capacitor, a first end of the first capacitor being electrically connected to the first node, a second end of the first capacitor being electrically connected to the second node;
a first end of the second capacitor is electrically connected with a second end of the first capacitor, and a second end of the second capacitor is electrically connected with the third node;
a first dc/dc conversion circuit, a first end of the first dc/dc conversion circuit including a fourth node and a fifth node, the fourth node being electrically connected to the first node, the fifth node being electrically connected to the third node, a second end of the first dc/dc conversion circuit including a sixth node and a seventh node;
A second dc/dc conversion circuit, a first end of which includes an eighth node and a ninth node, the eighth node is electrically connected to the fourth node, the ninth node is electrically connected to the fifth node, a second end of which includes a tenth node and an eleventh node, the tenth node is electrically connected to the seventh node, or the tenth node is electrically connected to the sixth node, the eleventh node is electrically connected to the seventh node, and a terminal voltage between the eleventh node and the sixth node is a first voltage; and
And the first end of the third direct current/direct current conversion circuit comprises a twelfth node and a thirteenth node, the twelfth node is electrically connected with the first end of the first capacitor, the thirteenth node is electrically connected with the second end of the second capacitor, and the terminal voltage of the second end of the third direct current/direct current conversion circuit is a second voltage.
Compared with the prior art, according to the vehicle-mounted charging and discharging system, the first direct current/direct current conversion circuit, the second direct current/direct current conversion circuit and the third direct current/direct current conversion circuit share the first capacitor and the second capacitor on the bus and are matched with the alternating current/direct current conversion circuit, the charging and discharging system can optimize the heat and the volume of the magnetic element in the vehicle-mounted charging and discharging system on the premise of ensuring the original functions, so that potential safety hazards are reduced, and the cost is saved.
Drawings
fig. 1 is a schematic block diagram of a vehicle-mounted charging and discharging system according to an embodiment of the present application;
fig. 2 is a first circuit block diagram of a vehicle-mounted charging and discharging system according to an embodiment of the present application;
Fig. 3 is a first schematic circuit diagram of a vehicle-mounted charging and discharging system according to an embodiment of the present disclosure;
Fig. 4 is a circuit block diagram ii of a vehicle-mounted charging and discharging system according to another embodiment of the present application;
Fig. 5 is a circuit block diagram iii of a vehicle-mounted charging and discharging system according to another embodiment of the present application;
Fig. 6 is a fourth circuit block diagram of a vehicle-mounted charging and discharging system according to another embodiment of the present application;
Fig. 7 is a second schematic circuit diagram of a vehicle-mounted charging and discharging system according to another embodiment of the present application;
Fig. 8 is a circuit block diagram of a vehicle-mounted charging and discharging system according to another embodiment of the present application.
Detailed Description
in order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
it will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, an embodiment of the present application provides a vehicle charging and discharging system 10 electrically connected to a single-phase/three-phase power source 101. The vehicle-mounted charge and discharge system 10 includes: an ac/dc conversion circuit 100, a first capacitor 200, a second capacitor 300, a first dc/dc conversion circuit 400, a second dc/dc conversion circuit 500, and a third dc/dc conversion circuit 600. A first terminal of the ac/dc conversion circuit 100 is electrically connected to the single-phase/three-phase power source 101. The second terminal of the ac/dc conversion circuit 100 includes a first node, a second node, and a third node. A first terminal of the first capacitor 200 is electrically connected to the first node. A second terminal of the first capacitor 200 is electrically connected to the second node. A first terminal of the second capacitor 300 is electrically connected to a second terminal of the first capacitor 200. A second terminal of the second capacitor 300 is electrically connected to the third node.
The first terminal of the first dc/dc conversion circuit 400 includes a fourth node and a fifth node. The fourth node is electrically connected to the first node. The second terminal of the first dc/dc conversion circuit 400 includes a sixth node and a seventh node. The first terminal of the second dc/dc conversion circuit 500 includes an eighth node and a ninth node. The eighth node is electrically connected to the fifth node. The ninth node is electrically connected to the third node. The second terminal of the second dc/dc conversion circuit 500 includes a tenth node and an eleventh node. The tenth node is electrically connected with the seventh node; alternatively, the tenth node is electrically connected to the sixth node, and the eleventh node is electrically connected to the seventh node. A terminal voltage between the eleventh node and the sixth node is a first voltage.
the first terminal of the third dc/dc conversion circuit 600 includes a twelfth node and a thirteenth node. The twelfth node is electrically connected to the first end of the first capacitor 200. The thirteenth node is electrically connected to the second terminal of the second capacitor 300. The terminal voltage of the second terminal of the third dc/dc conversion circuit 600 is a second voltage.
it is to be understood that the specific circuit structure of the ac/dc conversion circuit 100 is not limited as long as it has a function of converting ac power supplied from the single-phase/three-phase power supply 101 into dc power. In one embodiment, the ac/dc conversion circuit 100 may be composed of a full bridge rectifier and an EMI filter. In one embodiment, the ac/dc conversion circuit 100 may also be a PFC (Power Factor Correction) circuit. The ac power supplied from the single-phase/three-phase power source 101 is converted into dc power by the ac/dc conversion circuit 100, and is supplied to the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500.
in one embodiment, the ac/dc conversion circuit 100 is a bidirectional conversion circuit. That is, the ac/dc conversion circuit 100 can convert the ac power supplied from the single-phase/three-phase power source 101 into dc power. The dc power provided by the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 may also be converted into ac power.
in one embodiment, the first node may be a positive pole of the second terminal of the ac/dc conversion circuit 100. The third node may be a cathode of the second terminal of the ac/dc conversion circuit 100. Similarly, the fourth node may be a positive pole of the first terminal of the first dc/dc conversion circuit 400, and the fifth node may be a negative pole of the first terminal of the first dc/dc conversion circuit 400. The sixth node may be a positive pole of the second terminal of the first dc/dc conversion circuit 400, and the seventh node may be a negative pole of the second terminal of the first dc/dc conversion circuit 400.
The eighth node may be a positive terminal of the first terminal of the second dc/dc conversion circuit 500, and the ninth node may be a negative terminal of the first terminal of the second dc/dc conversion circuit 500. The tenth node may be a positive electrode of the second terminal of the second dc/dc conversion circuit 500, and the eleventh node may be a negative electrode of the second terminal of the second dc/dc conversion circuit 500. The twelfth node may be a positive electrode of the first terminal of the third dc/dc conversion circuit 600, and the thirteenth node may be a negative electrode of the first terminal of the third dc/dc conversion circuit 600.
It is understood that the specific structure of the first dc/dc conversion circuit 400 is not limited as long as it has the function of cooperating with the second dc/dc conversion circuit 500 and outputting the first voltage based on the dc power provided by the ac/dc conversion circuit 100 or outputting the dc power to the ac/dc conversion circuit 100 based on the first voltage. In one embodiment, the first dc/dc converter circuit 400 may be composed of a dc/dc converter and an EMI filter. In one embodiment, the first dc/dc converter circuit 400 may also be formed by a dc/dc converter and a capacitor. Wherein the second terminal of the first dc/dc conversion circuit 400 is connected in parallel (as shown in fig. 1) or in series (as shown in fig. 2) with the second terminal of the second dc/dc conversion circuit 500.
in one embodiment, the second dc/dc conversion circuit 500 has the same topology as the first dc/dc conversion circuit 400. In one embodiment, the vehicle charging and discharging system 10 may include at least one of the first dc/dc conversion circuit 400 and at least one of the second dc/dc conversion circuit 500. In one embodiment, the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 cooperate to output the first voltage based on the dc power provided by the ac/dc conversion circuit 100 or output the dc power to the ac/dc conversion circuit 100 based on the first voltage.
That is, the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 may be bidirectional conversion circuits. Through the cooperation of the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500, the charging and discharging system can reduce ripples and output filter capacitors on the premise of ensuring the original functions, thereby optimizing the size and reducing the cost.
It is understood that the specific structure of the third dc/dc conversion circuit 600 is not limited as long as it has a function of outputting the second voltage based on the dc power provided by the ac/dc conversion circuit 100 or outputting the dc power to the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 based on the second voltage. In one embodiment, the third dc/dc conversion circuit 600 may be formed by a dc/dc converter. In one embodiment, the third dc/dc converter circuit 600 may also be a full-bridge converter circuit.
in one embodiment, the second voltage is output by the third dc/dc conversion circuit 600 based on the dc power provided by the ac/dc conversion circuit 100, or the dc power is output to the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 based on the second voltage. That is, the third dc/dc conversion circuit 600 is a bidirectional conversion circuit. In one embodiment, the second voltage is less than the first voltage.
In one embodiment, the second voltage input/output from the second terminal of the third dc/dc conversion circuit 600 may be a low voltage (e.g., 9-16V). When the second terminal of the first dc/dc conversion circuit 400 is connected in parallel with the second terminal of the second dc/dc conversion circuit 500, the terminal voltage (i.e. the first voltage) between the sixth node and the eleventh node is a high voltage (200-500V); or, when the second terminal of the first dc/dc conversion circuit 400 is connected in series with the second terminal of the second dc/dc conversion circuit 500, the terminal voltage (i.e. the first voltage) between the sixth node and the eleventh node is a high voltage (500-800V). Thus, the third DC/DC conversion circuit 600 can be applied to the high voltage output by the 200-500V system or the 500-800V system. In addition, since the third dc/dc conversion circuit 600 takes power from the bus, the voltage is relatively stable, and the transformer inside the third dc/dc conversion circuit 600 can be optimized.
in one embodiment, the vehicle charging and discharging system 10 may be applied to an electric vehicle. Specifically, when the electric vehicle is charged by the single/three-phase power source 101, the ac/dc conversion circuit 100 converts ac power supplied from the single/three-phase power source 101 into dc power and supplies the dc power to the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500. The first dc/dc converter circuit 400 and the second dc/dc converter circuit 500 output the first voltage (i.e., the terminal voltage output between the eleventh node and the sixth node) based on the dc power and charge a high-voltage battery of an electric vehicle.
Meanwhile, the ac/dc conversion circuit 100 may also provide the dc power to the third dc/dc conversion circuit 600 through the first capacitor 200 and the second capacitor 300. The third dc/dc conversion circuit 600 outputs the second voltage based on the dc power and charges a low-voltage battery of the electric vehicle. At this time, the first dc/dc conversion circuit 400, the second dc/dc conversion circuit 500, and the third dc/dc conversion circuit 600 share the first capacitor 200 and the second capacitor 300 on the bus, and are matched with the ac/dc conversion circuit 100, so that the vehicle-mounted charge and discharge system realizes the staggered parallel output of the two dc/dc conversion circuits, and can reduce ripples, reduce the number of output filter capacitors, optimize the heat and volume of magnetic elements in the vehicle-mounted charge and discharge system, thereby reducing potential safety hazards and saving cost on the premise of ensuring the original functions. Furthermore, the withstand voltage of the switch in each dc/dc conversion circuit can be reduced, and the cost per switch can be reduced, so that the power that can be borne by the vehicle-mounted charging/discharging system 10 can also be increased.
in one embodiment, when the high voltage battery on the electric vehicle is discharged, the first voltage (i.e., the voltage of the high voltage battery when the high voltage battery is discharged) may be received by the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500, and the first voltage is converted and provided to the third dc/dc conversion circuit 600, so that the third dc/dc conversion circuit 600 outputs the second voltage based on the converted first voltage, thereby charging the low voltage battery. Meanwhile, the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 may convert the first voltage and provide the converted first voltage to the ac/dc conversion circuit 100 through the first capacitor 200 and the second capacitor 300, so that the ac/dc conversion circuit 100 provides ac power based on the converted first voltage.
in one embodiment, when the low-voltage battery on the electric vehicle is discharged, the third dc/dc conversion circuit 600 may receive the second voltage (i.e., the voltage of the low-voltage battery when the low-voltage battery is discharged), convert the second voltage, and provide the converted second voltage to the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500, so that the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 output the first voltage based on the converted second voltage, thereby charging the high-voltage battery.
In this embodiment, the first dc/dc conversion circuit 400, the second dc/dc conversion circuit 500, and the third dc/dc conversion circuit 600 share the first capacitor 200 and the second capacitor 300 on the bus and are matched with the ac/dc conversion circuit 100, so that the vehicle-mounted charging and discharging system implements the staggered parallel output of the two dc/dc conversion circuits, and can reduce ripples, reduce the number of output filter capacitors, optimize heat and volume of magnetic elements in the vehicle-mounted charging and discharging system, save cost, reduce withstand voltage of switches in each dc/dc conversion circuit, reduce cost of each switch, and further improve the power that can be borne by the vehicle-mounted charging and discharging system 10 on the premise of ensuring the original function.
in one embodiment, the vehicle charging and discharging system 10 further includes: a third capacitor 700 and a fourth capacitor 800. A first terminal of the third capacitor 700 is electrically connected to the fourth node. A second terminal of the third capacitor 700 is electrically connected to a fifth node. A first terminal of the fourth capacitor 800 is electrically connected to the eighth node. A second terminal of the fourth capacitor 800 is electrically connected to the ninth node. The third capacitor 700 may stabilize the voltage of the first terminal of the first dc/dc conversion circuit 400, and the fourth capacitor 800 may stabilize the voltage of the first terminal of the second dc/dc conversion circuit 500, thereby protecting the circuits from damage.
referring to fig. 3, the first dc/dc conversion circuit 400 is connected in series with the input of the second dc/dc conversion circuit 500. In one embodiment, the first dc/dc conversion circuit 400 includes: a first switch 410, a second switch 420, a third switch 430, a fourth switch 440, a first resonator 450, a fifth switch 460, a sixth switch 470, a seventh switch 480, and an eighth switch 490. A first terminal of the first switch 410 is electrically connected to the first node. A first terminal of the second switch 420 is electrically connected to a first terminal of the first switch 410. A first terminal of the third switch 430 is electrically connected to a second terminal of the first switch 410. A second terminal of the third switch 430 is electrically connected to the eighth node.
A first terminal of the fourth switch 440 is electrically connected to a second terminal of the second switch 420. A second terminal of the four switches 440 is electrically connected to a first terminal of the third switch 430. The first end of the first resonant cavity 450 includes fourteen nodes and fifteen nodes. The second end of the first resonator 450 includes sixteen nodes and seventeen nodes. The fourteen nodes are electrically connected to the second terminal of the second switch 420 and the first terminal of the fourth switch 440, respectively. The fifteen nodes are electrically connected to the second terminal of the first switch 410 and the first terminal of the third switch 430, respectively.
A first terminal of the fifth switch 460 is electrically connected to the sixth node. A second terminal of the fifth switch 460 is electrically connected to the sixteen node. A first terminal of the sixth switch 470 is electrically connected to the sixth node. A second terminal of the sixth switch 470 is electrically connected to the seventeen node. A first terminal of the seventh switch 480 is electrically connected to the sixteen nodes. A second terminal of the seventh switch 480 is electrically connected to the eleventh node. A first terminal of the eighth switch 490 is electrically connected to the seventeen nodes. A second terminal of the eighth switch 490 is electrically connected to the eleventh node.
In one embodiment, the first switch 410, the second switch 420, the third switch 430, the fourth switch 440, the fifth switch 460, the sixth switch 470, the seventh switch 480 and the eighth switch 490 may all adopt switches with lower withstand voltage (such as switches with withstand voltage of 600V to 800V, 650V in a preferred embodiment), such as an IGBT (Insulated Gate Bipolar Transistor), a MOS Transistor, etc. Thus, on the basis of ensuring the original functions, the cost of the switch can be greatly reduced, so that the cost of the first direct current/direct current conversion circuit 400 can be reduced, and the cost of the vehicle-mounted charging and discharging system 10 can be reduced.
in one embodiment, the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 may be bidirectional conversion circuits. The first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 cooperate to convert the dc power provided by the ac/dc conversion circuit 100 and output the first voltage, or convert the first voltage and output the dc power to the ac/dc conversion circuit 100 or the third dc/dc conversion circuit 600.
In one embodiment, the third dc/dc converting circuit 600 is a bidirectional converting circuit or a unidirectional converting circuit. In one embodiment, the third dc/dc conversion circuit 600 converts the dc power provided by the ac/dc conversion circuit 100 to output the second voltage, or converts the second voltage to output the dc power. In this case, the third dc/dc conversion circuit 600 is a bidirectional conversion circuit. In an embodiment, if the third dc/dc conversion circuit 600 only has a function of converting the dc power provided by the ac/dc conversion circuit 100 and outputting the second voltage, the third dc/dc conversion circuit 600 is a unidirectional conversion circuit.
referring to fig. 4, in an embodiment, the vehicle-mounted charging and discharging system 10 further includes: a ninth switch 510, a tenth switch 520, and an eleventh switch 530. The ninth switch 510 is electrically connected between the seventh node and the eleventh node. The tenth switch 520 is electrically connected between the seventh node and the tenth node. The eleventh switch 530 is electrically connected between the sixth node and the tenth node. When the second terminal of the second dc/dc conversion circuit 500 is connected in series with the second terminal of the first dc/dc conversion circuit 400, the tenth switch 520 is closed, and the ninth switch 510 and the eleventh switch 530 are opened. When the second terminal of the second dc/dc conversion circuit 500 is connected in parallel to the second terminal of the first dc/dc conversion circuit 400, the ninth switch 510 and the eleventh switch 530 are closed, and the tenth switch 520 is opened.
in one embodiment, the ninth switch 510, the tenth switch 520, and the eleventh switch 530 may be switched using relay switches. Specifically, the relay switch can be controlled by the main control equipment of the automobile. Through the cooperation of the ninth switch 510, the tenth switch 520, and the eleventh switch 530, the second terminal of the first dc/dc converter circuit 400 and the second terminal of the second dc/dc converter circuit 500 can be switched in series or in parallel, so that the range of the terminal voltage output between the eleventh node and the sixth node is wider, and the applicability is wider.
referring to fig. 5 and 6, an embodiment of the present application provides a vehicle charging and discharging system 10 electrically connected to a single-phase/three-phase power source 101. The vehicle-mounted charge and discharge system 10 includes: an ac/dc conversion circuit 100, a first capacitor 200, a second capacitor 300, a first dc/dc conversion circuit 400, a second dc/dc conversion circuit 500, and a third dc/dc conversion circuit 600. A first terminal of the ac/dc conversion circuit 100 is electrically connected to the single-phase/three-phase power source 101. The second terminal of the ac/dc conversion circuit 100 includes a first node, a second node, and a third node. A first terminal of the first capacitor 200 is electrically connected to the first node. A second terminal of the first capacitor 200 is electrically connected to the second node. A first terminal of the second capacitor 300 is electrically connected to a second terminal of the first capacitor 200. A second terminal of the second capacitor 300 is electrically connected to the third node.
the first terminal of the first dc/dc conversion circuit 400 includes a fourth node and a fifth node. The fourth node is electrically connected to the first node. The fifth node is electrically connected to the third node. The second terminal of the first dc/dc conversion circuit 400 includes a sixth node and a seventh node. The first terminal of the second dc/dc conversion circuit 500 includes an eighth node and a ninth node. The eighth node is electrically connected to the fourth node. The ninth node is electrically connected with the fifth node. The second terminal of the second dc/dc conversion circuit 500 includes a tenth node and an eleventh node. The tenth node is electrically connected with the seventh node; alternatively, the tenth node is electrically connected to the sixth node, and the eleventh node is electrically connected to the seventh node. A terminal voltage between the eleventh node and the sixth node is a first voltage.
the first terminal of the third dc/dc conversion circuit 600 includes a twelfth node and a thirteenth node. The twelfth node is electrically connected to the first end of the first capacitor 200. The thirteenth node is electrically connected to the second terminal of the second capacitor 300. The terminal voltage of the second terminal of the third dc/dc conversion circuit 600 is a second voltage.
in one embodiment, the specific circuit structures of the ac/dc conversion circuit 100, the first dc/dc conversion circuit 400, the second dc/dc conversion circuit 500, and the third dc/dc conversion circuit 600 may adopt the structures described in the above embodiments.
In this embodiment, the first end of the first dc/dc conversion circuit 400 is connected in parallel with the first end of the second dc/dc conversion circuit 500, and the first capacitor 200 and the second capacitor 300 on the bus are shared by the first dc/dc conversion circuit 400, the second dc/dc conversion circuit 500, and the third dc/dc conversion circuit 600 and are matched with the ac/dc conversion circuit 100, so that the vehicle-mounted charging and discharging system realizes the staggered parallel output of the two dc/dc conversion circuits. Furthermore, the withstand voltage of the switch in each dc/dc conversion circuit can be reduced, and the cost per switch can be reduced, so that the power that can be borne by the vehicle-mounted charging/discharging system 10 can also be increased.
referring to fig. 7, the first dc/dc conversion circuit 400 is connected in parallel with the input of the second dc/dc conversion circuit 500. In one embodiment, the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 have the same topology. In one embodiment, the first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 may be bidirectional conversion circuits. The first dc/dc conversion circuit 400 and the second dc/dc conversion circuit 500 are matched to convert the dc power provided by the ac/dc conversion circuit 100 and output the first voltage, or convert the first voltage and output the dc power.
In one embodiment, the first dc/dc conversion circuit 400 includes: a first switch 410, a second switch 420, a third switch 430, a fourth switch 440, a first resonator 450, a fifth switch 460, a sixth switch 470, a seventh switch 480, and an eighth switch 490. A first terminal of the first switch 410 is electrically connected to the first node. A first terminal of the second switch 420 is electrically connected to a first terminal of the first switch 410. A first terminal of the third switch 430 is electrically connected to a second terminal of the first switch 410. A second terminal of the third switch 430 is electrically connected to the third node.
A first terminal of the fourth switch 440 is electrically connected to a second terminal of the second switch 420. A second terminal of the four switches 440 is electrically connected to the third node. The first end of the first resonant cavity 450 includes fourteen nodes and fifteen nodes. The second end of the first resonator 450 includes sixteen nodes and seventeen nodes. The fourteen nodes are electrically connected to the second terminal of the second switch 420 and the first terminal of the fourth switch 440, respectively. The fifteen nodes are electrically connected to the second terminal of the first switch 410 and the first terminal of the third switch 430, respectively.
A first terminal of the fifth switch 460 is electrically connected to the sixth node. A second terminal of the fifth switch 460 is electrically connected to the sixteen node. A first terminal of the sixth switch 470 is electrically connected to the sixth node. A second terminal of the sixth switch 470 is electrically connected to the seventeen node. A first terminal of the seventh switch 480 is electrically connected to the sixteen nodes. A second terminal of the seventh switch 480 is electrically connected to the eleventh node. A first terminal of the eighth switch 490 is electrically connected to the seventeen nodes. A second terminal of the eighth switch 490 is electrically connected to the eleventh node.
In one embodiment, the first switch 410, the second switch 420, the third switch 430, the fourth switch 440, the fifth switch 460, the sixth switch 470, the seventh switch 480 and the eighth switch 490 may all adopt switches with lower withstand voltage (such as switches with a withstand voltage of 600V to 800V, 650V in a preferred embodiment), such as IGBT, MOS, etc. Thus, on the basis of ensuring the original functions, the cost of the switch can be greatly reduced, so that the cost of the first direct current/direct current conversion circuit 400 can be reduced, and the cost of the vehicle-mounted charging and discharging system 10 can be reduced.
Referring to fig. 8, in an embodiment, the vehicle-mounted charging and discharging system 10 further includes: a ninth switch 510, a tenth switch 520, and an eleventh switch 530. The ninth switch 510 is electrically connected between the seventh node and the eleventh node. The tenth switch 520 is electrically connected between the seventh node and the tenth node. The eleventh switch 530 is electrically connected between the sixth node and the tenth node. When the second terminal of the second dc/dc conversion circuit 500 is connected in series with the second terminal of the first dc/dc conversion circuit 400, the tenth switch 520 is closed, and the ninth switch 510 and the eleventh switch 530 are opened. When the second terminal of the second dc/dc conversion circuit 500 is connected in parallel to the second terminal of the first dc/dc conversion circuit 400, the ninth switch 510 and the eleventh switch 530 are closed, and the tenth switch 520 is opened.
in one embodiment, the ninth switch 510, the tenth switch 520, and the eleventh switch 530 may also be switched using relay switches. Specifically, the relay switch can be controlled by the main control equipment of the automobile. Through the cooperation of the ninth switch 510, the tenth switch 520, and the eleventh switch 530, the second terminal of the first dc/dc converter circuit 400 and the second terminal of the second dc/dc converter circuit 500 can be switched in series or in parallel, so that the range of the terminal voltage output between the eleventh node and the sixth node is wider, and the applicability is wider.
In an embodiment, the vehicle charging/discharging system 10 may include a plurality of dc/dc converting circuits, wherein first ends of the plurality of dc/dc converting circuits are connected in parallel or in series, and second ends of the plurality of dc/dc converting circuits are connected in parallel or in series, so as to further reduce withstand voltage that the switch in each module can bear, and reduce cost of the switch.
to sum up, this application through with first direct current/direct current converting circuit 400 on second direct current/direct current converting circuit 500 and the sharing bus of third direct current/direct current converting circuit 600 first electric capacity 200 with second electric capacity 300, and with interchange direct current converting circuit 100 cooperation for on-vehicle charge-discharge system realizes two direct current/direct current converting circuit crisscross parallel output, can reduce the ripple under the prerequisite of guaranteeing original function, reduces output filter capacitor quantity, optimizes the heat and the volume of the interior magnetic element of on-vehicle charge-discharge system, thereby reduces the potential safety hazard, practices thrift the cost. Furthermore, the withstand voltage of the switch in each dc/dc conversion circuit can be reduced, and the cost per switch can be reduced, so that the power that can be borne by the vehicle-mounted charging/discharging system 10 can also be increased.
the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
the above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A vehicle-mounted charging and discharging system electrically connected to a single-phase/three-phase power supply (101), comprising:
an AC/DC conversion circuit (100), a first terminal of the AC/DC conversion circuit (100) being electrically connected to the single/three phase power source (101), a second terminal of the AC/DC conversion circuit (100) comprising a first node, a second node, and a third node;
A first capacitor (200), a first terminal of the first capacitor (200) being electrically connected to the first node, a second terminal of the first capacitor (200) being electrically connected to the second node;
A second capacitor (300), a first terminal of the second capacitor (300) being electrically connected to a second terminal of the first capacitor (200), a second terminal of the second capacitor (300) being electrically connected to the third node;
A first DC/DC conversion circuit (400), a first end of the first DC/DC conversion circuit (400) comprising a fourth node and a fifth node, the fourth node being electrically connected to the first node, a second end of the first DC/DC conversion circuit (400) comprising a sixth node and a seventh node;
A second dc/dc conversion circuit (500), a first end of the second dc/dc conversion circuit (500) includes an eighth node and a ninth node, the eighth node is electrically connected to the fifth node, the ninth node is electrically connected to the third node, a second end of the second dc/dc conversion circuit (500) includes a tenth node and an eleventh node, the tenth node is electrically connected to the seventh node, or the tenth node is electrically connected to the sixth node, the eleventh node is electrically connected to the seventh node, and a terminal voltage between the eleventh node and the sixth node is a first voltage; and
a third dc/dc conversion circuit (600), wherein the first terminal of the third dc/dc conversion circuit (600) includes a twelfth node and a thirteenth node, the twelfth node is electrically connected to the first terminal of the first capacitor (200), the thirteenth node is electrically connected to the second terminal of the second capacitor (300), and a terminal voltage of the second terminal of the third dc/dc conversion circuit (600) is a second voltage.
2. The vehicle charging and discharging system according to claim 1, wherein the second voltage is smaller than the first voltage.
3. the vehicle-mounted charge and discharge system according to claim 1, further comprising:
A third capacitor (700), a first terminal of the third capacitor (700) being electrically connected to the fourth node, a second terminal of the third capacitor (700) being electrically connected to a fifth node;
A fourth capacitor (800), a first terminal of the fourth capacitor (800) being electrically connected to the eighth node, a second terminal of the fourth capacitor (800) being electrically connected to the ninth node.
4. The vehicle-mounted charge and discharge system according to claim 1, wherein said first dc/dc conversion circuit (400) comprises:
a first switch (410), a first terminal of the first switch (410) being electrically connected to the first node;
A second switch (420), a first end of the second switch (420) being electrically connected to a first end of the first switch (410);
A third switch (430), a first end of the third switch (430) being electrically connected to the second end of the first switch (410), a second end of the third switch (430) being electrically connected to the eighth node;
A fourth switch (440), a first terminal of the fourth switch (440) being electrically connected to the second terminal of the second switch (420), a second terminal of the fourth switch (440) being electrically connected to the eighth node;
a first resonant cavity (450), a first end of the first resonant cavity (450) comprising a fourteen node and a fifteen node, a second end of the first resonant cavity (450) comprising a sixteen node and a seventeen node, the fourteen node being electrically connected to a second end of the second switch (420) and a first end of the fourth switch (440), respectively, and the fifteen node being electrically connected to a second end of the first switch (410) and a first end of the third switch (430), respectively;
A fifth switch (460), a first terminal of the fifth switch (460) being electrically connected to the sixth node, a second terminal of the fifth switch (460) being electrically connected to the sixteen node;
a sixth switch (470), a first terminal of the sixth switch (470) being electrically connected to the sixth node, a second terminal of the sixth switch (470) being electrically connected to the seventeen node;
A seventh switch (480), a first terminal of the seventh switch (480) being electrically connected to the sixteen node, a second terminal of the seventh switch (480) being electrically connected to the eleventh node;
An eighth switch (490), a first end of the eighth switch (490) being electrically connected to the seventeenth node, a second end of the eighth switch (490) being electrically connected to the eleventh node.
5. the vehicle-mounted charge/discharge system according to claim 1, wherein at least one of the ac/dc conversion circuit (100), the first dc/dc conversion circuit (400), and the second dc/dc conversion circuit (500) is a bidirectional conversion circuit.
6. the vehicle-mounted charge and discharge system according to claim 1, wherein the third dc/dc conversion circuit (600) is a bidirectional conversion circuit or a unidirectional conversion circuit.
7. The vehicle-mounted charge and discharge system according to claim 1, wherein the first dc/dc conversion circuit (400) and the second dc/dc conversion circuit (500) have the same topology.
8. The vehicle charging and discharging system according to any one of claims 1 to 7, further comprising:
A ninth switch (510), the ninth switch (510) being electrically connected between the seventh node and the eleventh node;
A tenth switch (520), the tenth switch (520) being electrically connected between the seventh node and the tenth node;
An eleventh switch (530), the eleventh switch (530) being electrically connected between the sixth node and the tenth node;
closing the tenth switch (520) and opening the ninth switch (510) and the eleventh switch (530) when the second terminal of the second DC/DC conversion circuit (500) is connected in series with the second terminal of the first DC/DC conversion circuit (400);
When the second terminal of the second DC/DC conversion circuit (500) is connected in parallel with the second terminal of the first DC/DC conversion circuit (400), the ninth switch (510) and the eleventh switch (530) are closed, and the tenth switch (520) is opened.
9. A vehicle-mounted charging and discharging system electrically connected to a single-phase/three-phase power supply (101), comprising:
an AC/DC conversion circuit (100), a first terminal of the AC/DC conversion circuit (100) being electrically connected to the single/three phase power source (101), a second terminal of the AC/DC conversion circuit (100) comprising a first node, a second node, and a third node;
a first capacitor (200), a first terminal of the first capacitor (200) being electrically connected to the first node, a second terminal of the first capacitor (200) being electrically connected to the second node;
a second capacitor (300), a first terminal of the second capacitor (300) being electrically connected to a second terminal of the first capacitor (200), a second terminal of the second capacitor (300) being electrically connected to the third node;
a first DC/DC conversion circuit (400), a first end of the first DC/DC conversion circuit (400) comprising a fourth node and a fifth node, the fourth node being electrically connected to the first node, the fifth node being electrically connected to the third node, a second end of the first DC/DC conversion circuit (400) comprising a sixth node and a seventh node;
a second dc/dc conversion circuit (500), a first end of the second dc/dc conversion circuit (500) including an eighth node and a ninth node, the eighth node being electrically connected to the fourth node, the ninth node being electrically connected to the fifth node, a second end of the second dc/dc conversion circuit (500) including a tenth node and an eleventh node, the tenth node being electrically connected to the seventh node, or the tenth node being electrically connected to the sixth node, the eleventh node being electrically connected to the seventh node, a terminal voltage between the eleventh node and the sixth node being a first voltage; and
A third dc/dc conversion circuit (600), wherein the first terminal of the third dc/dc conversion circuit (600) includes a twelfth node and a thirteenth node, the twelfth node is electrically connected to the first terminal of the first capacitor (200), the thirteenth node is electrically connected to the second terminal of the second capacitor (300), and a terminal voltage of the second terminal of the third dc/dc conversion circuit (600) is a second voltage.
10. The vehicle charging and discharging system according to claim 9, wherein the second voltage is smaller than the first voltage.
11. The vehicle-mounted charge/discharge system according to claim 9, wherein at least one of the ac/dc conversion circuit (100), the first dc/dc conversion circuit (400), and the second dc/dc conversion circuit (500) is a bidirectional conversion circuit.
12. the vehicle-mounted charge and discharge system according to claim 9, wherein the third dc/dc conversion circuit (600) is a bidirectional conversion circuit or a unidirectional conversion circuit.
13. The vehicle-mounted charge and discharge system according to claim 9, wherein the first dc/dc conversion circuit (400) and the second dc/dc conversion circuit (500) have the same topology.
14. The vehicle charge and discharge system according to claim 13, wherein said first dc/dc conversion circuit (400) comprises:
a first switch (410), a first terminal of the first switch (410) being electrically connected to the first node;
A second switch (420), a first end of the second switch (420) being electrically connected to a first end of the first switch (410);
a third switch (430), a first terminal of the third switch (430) being electrically connected to the second terminal of the first switch (410), a second terminal of the third switch (430) being electrically connected to the third node;
a fourth switch (440), a first terminal of the fourth switch (440) being electrically connected to the second terminal of the second switch (420), a second terminal of the fourth switch (440) being electrically connected to the third node;
A first resonant cavity (450), a first end of the first resonant cavity (450) comprising a fourteen node and a fifteen node, a second end of the first resonant cavity (450) comprising a sixteen node and a seventeen node, the fourteen node being electrically connected to a second end of the second switch (420) and a first end of the fourth switch (440), respectively, and the fifteen node being electrically connected to a second end of the first switch (410) and a first end of the third switch (430), respectively;
A fifth switch (460), a first terminal of the fifth switch (460) being electrically connected to the sixth node, a second terminal of the fifth switch (460) being electrically connected to the sixteen node;
A sixth switch (470), a first terminal of the sixth switch (470) being electrically connected to the sixth node, a second terminal of the sixth switch (470) being electrically connected to the seventeen node;
A seventh switch (480), a first terminal of the seventh switch (480) being electrically connected to the sixteen node, a second terminal of the seventh switch (480) being electrically connected to the eleventh node;
an eighth switch (490), a first end of the eighth switch (490) being electrically connected to the seventeenth node, a second end of the eighth switch (490) being electrically connected to the eleventh node.
15. The vehicle charging and discharging system according to any one of claims 9 to 14, further comprising:
A ninth switch (510), the ninth switch (510) being electrically connected between the seventh node and the eleventh node;
A tenth switch (520), the tenth switch (520) being electrically connected between the seventh node and the tenth node;
an eleventh switch (530), the eleventh switch (530) being electrically connected between the sixth node and the tenth node;
closing the tenth switch (520) and opening the ninth switch (510) and the eleventh switch (530) when the second terminal of the second DC/DC conversion circuit (500) is connected in series with the second terminal of the first DC/DC conversion circuit (400);
When the second terminal of the second DC/DC conversion circuit (500) is connected in parallel with the second terminal of the first DC/DC conversion circuit (400), the ninth switch (510) and the eleventh switch (530) are closed, and the tenth switch (520) is opened.
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| CN201910900675.4A CN110556901A (en) | 2019-09-23 | 2019-09-23 | vehicle-mounted charging and discharging system |
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| CN201910900675.4A CN110556901A (en) | 2019-09-23 | 2019-09-23 | vehicle-mounted charging and discharging system |
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