CN114024363A - Double-power-supply system based on electric automobile and control method thereof - Google Patents
Double-power-supply system based on electric automobile and control method thereof Download PDFInfo
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- CN114024363A CN114024363A CN202111422162.0A CN202111422162A CN114024363A CN 114024363 A CN114024363 A CN 114024363A CN 202111422162 A CN202111422162 A CN 202111422162A CN 114024363 A CN114024363 A CN 114024363A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/003—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a double power supply system based on an electric automobile and a control method thereof, wherein the double power supply system comprises a first charging loop and a second charging loop which are connected in parallel between a high-voltage direct current input end and an in-automobile low-voltage load, and a communication and control module is connected between the first charging loop and the second charging loop; the communication and control module detects the states of the first charging circuit and the second charging circuit, and cuts off the first charging circuit and/or the second charging circuit to supply power to the low-voltage load in the vehicle according to the states; the invention adopts two charging loops which operate independently without influencing each other, increases the redundancy of the charging system, grades the low-voltage load in the vehicle, and determines to supply power to the important first-level load or all the loads according to the electric quantity of the lithium battery, thereby further improving the system safety of the electric vehicle.
Description
Technical Field
The invention relates to a power supply circuit, in particular to a double-power-supply system based on an electric automobile and a control method thereof.
Background
At present, the production scale of new energy automobiles is increased day by day, and the demand of low-voltage storage batteries is also increased day by day. The traditional lead storage battery has the characteristics of large volume, high weight, low energy density and high recovery cost, and the lithium battery has the characteristics of high energy density, long service life, low environmental pollution, high cost performance and the like, so that more and more lead storage batteries can be replaced by the lithium battery on future electric vehicles. Along with the increasing of vehicle-mounted mutual entertainment systems including vehicle-mounted sound systems, navigation systems, vehicle information systems, vehicle-mounted household appliances and the like, the requirements of people on the output power of electric vehicles are higher and higher, namely the power demand of loads is increased, and along with the rising of vehicle-mounted intelligent auxiliary driving systems and the subsequent development of unmanned driving, the low-voltage power supply safety of the electric vehicles becomes a great importance.
Referring to the conventional power supply circuit shown in fig. 1, an electric vehicle converts high voltage into low voltage through a DCDC module, and the low voltage firstly passes through a lithium battery and then reaches a load end, whereas the capacity of the low voltage lithium battery is reduced due to the comprehensive consideration of cost and weight, so that the capacity of the battery is reduced, and the capacity of the battery is reduced due to the tendency of increasing the current vehicle-mounted low voltage load, so that a contradiction which is not easy to generate is generated between the two.
Therefore, it is an urgent technical problem in the industry to develop a dual power supply system based on an electric vehicle to improve the power supply guarantee of electric vehicle equipment.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a dual power supply system based on an electric automobile and a control method thereof.
The technical scheme adopted by the invention is to design a double-power supply system based on an electric automobile, which comprises a first charging loop and a second charging loop which are connected in parallel between a high-voltage direct current input end and an in-automobile low-voltage load, wherein a communication and control module is connected between the first charging loop and the second charging loop; the communication and control module detects the states of the first charging circuit and the second charging circuit and cuts off the first charging circuit and/or the second charging circuit to supply power to the low-voltage load in the vehicle according to the states.
The first charging loop comprises a first DC/DC module and a first battery E1 connected in series, and the second charging loop comprises a second DC/DC module and a second switching module connected in series.
The low-voltage load in the vehicle comprises a primary load and a secondary load, the primary load is connected with the first battery E1 and the second switch module, and the secondary load is connected with the second switch module.
The output end of the second switch module is connected with the secondary load and is connected with the primary load through the first switch module.
And a second battery E2 is connected between the positive output end and the negative output end of the second DC/DC module.
The output end of the first battery E1 is connected in series with a reverse flow prevention module, and the reverse flow prevention module comprises a diode D1.
The second switching module includes a first switching tube Q1.
The first switch module adopts an isolation Relay, or adopts a second switch tube Q2 and a third switch tube Q3 which are connected in series.
And a failure protection module is connected between the first DC/DC module and the first battery E1 in series.
The invention also designs a control method of the double power supply system based on the electric automobile, wherein the double power supply system adopts the double power supply system based on the electric automobile, and the control method comprises the following steps: the charging system is provided with a two-charging-loop normal mode, a first charging-loop abnormal mode and a second charging-loop abnormal mode, wherein in the two-charging-loop normal mode, the first charging loop and the second charging loop supply power; in the first charging loop abnormal mode, the first charging loop is stopped, and the second charging loop supplies power; in the second charging circuit abnormal mode, the second charging circuit is stopped, and the first charging circuit supplies power.
The control method further comprises the following steps: in the second charging loop abnormal mode, the second switch module is switched off, the battery capacity N of the first battery E1 is detected, the battery capacity N is compared with a capacity threshold value M, when the battery capacity N is larger than or equal to the capacity threshold value M, the first switch module is switched on, and the first battery E1 is used for supplying power to the primary load and the secondary load; and when the battery capacity N is smaller than the capacity threshold value M, the first switch module is switched off, and the first battery E1 is used for supplying power to the primary load.
The control method specifically comprises the following steps: step 1, after power-on, operating a first charging loop and a second charging loop; step 2, checking whether the state of the second charging loop is normal, if the first charging loop and the second charging loop are both normal, turning to the step 3, if the first charging loop is abnormal, turning to the step 4, and if the first charging loop is normal, turning to the step 6; step 3, switching on the first switch module and the second switch module, and turning to step 2; step 4, stopping the first charging loop; step 5, switching on the first switch module and the second switch module; step 6, switching off the second switch module, switching on the first switch module, stopping running the second charging loop and running the first charging loop; step 7, detecting the battery power N of the first battery E1; step 8, comparing whether the battery electric quantity N is larger than an electric quantity threshold value M, if the battery electric quantity N is larger than or equal to the electric quantity threshold value M, turning to step 9, and if the battery electric quantity N is smaller than the electric quantity threshold value M, turning to step 10; step 9, switching on the first switch module, and turning to step 7; and step 10, disconnecting the first switch module, and turning to step 7.
The technical scheme provided by the invention has the beneficial effects that:
(1) the two charging loops are used for ensuring the driving safety of the electric automobile, providing stable and reliable energy supply for basic functional safety loads of the electric automobile and providing safer technical support for the existing unmanned or auxiliary driving automobile; (2) the two charging loops operate independently without influencing each other, the redundancy of the charging system is increased, the system safety of the electric automobile is further improved, and a safer power supply system is provided for unmanned driving and intelligent driving; (3) the anti-reflux module is arranged to protect the lithium battery, and the switch circuit is arranged to physically isolate a fault circuit from a normal circuit, so that the safety of low-voltage power supply is protected; (4) the low-voltage load in the vehicle is classified, and the power supply to the important first-level load or all the loads is determined according to the electric quantity of the lithium battery, so that the system safety of the electric vehicle is further improved.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic block diagram of the prior art;
FIG. 2 is a basic functional block diagram of the first switching module not provided;
FIG. 3 is a schematic block diagram of the division of the low voltage load in the vehicle into one and two stages;
FIG. 4 is a functional block diagram of a first switch module;
FIG. 5 is a functional block diagram of a fail safe module and an anti-reflux module;
fig. 6 is a circuit diagram of a first switching tube Q1 adopted by the second switching module and an isolation Relay adopted by the first switching module;
fig. 7 is a circuit diagram in which the first switching tube Q1 is provided on the negative pole of the output of the second charging circuit;
fig. 8 is a circuit diagram of a second switching module using a first switching tube Q1, a second switching tube Q2 and a third switching tube Q3 connected in series;
FIG. 9 is a control flow diagram;
fig. 10 is a waveform diagram of an output when both the first and second charging circuits are operating normally;
fig. 11 shows an abnormal condition of the dual power supply system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a double-power supply system based on an electric automobile, which comprises a first charging loop and a second charging loop which are connected in parallel between a high-voltage direct current input end and a low-voltage load in the automobile, wherein a communication and control module is connected between the first charging loop and the second charging loop; the communication and control module detects the states of the first charging circuit and the second charging circuit and cuts off the first charging circuit and/or the second charging circuit to supply power to the low-voltage load in the vehicle according to the states. In practical use, the high-voltage direct current input end is connected with a high-voltage battery in the vehicle, the first charging circuit and the second charging circuit supply power when the first charging circuit and the second charging circuit are normal, the second charging circuit supplies power when the first charging circuit fails, and the first charging circuit supplies power when the second charging circuit fails. The first charging loop comprises a battery, and the battery supplies power for the functional safety load in the vehicle when the charging loop is in fault, so that the safety driving function of the electric vehicle is guaranteed, and the dangerous conditions such as power failure and the like during driving are avoided. The two charging loops operate independently without mutual influence, the redundancy of the charging system is increased, and the system safety of the electric automobile is improved.
In a preferred embodiment, the first charging loop comprises a first DC/DC module and a first battery E1 connected in series, and the second charging loop comprises a second DC/DC module and a second switching module connected in series. The communication and control module can control the operation and stop of the first DC/DC module and the second DC/DC module and can also control the on-off of the second switch module. When the second charging loop is normal, the second switch module is conducted, and the second charging loop supplies power to the low-voltage load in the vehicle; when the second charging loop is in fault, the second switch module is switched off, and the first charging loop supplies power to the low-voltage load in the vehicle. In the preferred embodiment, the first battery E1 is a lithium battery.
Referring to fig. 3, the low voltage load in the vehicle includes a primary load connected to the first battery E1 and the second switching module and a secondary load connected to the second switching module. The low-voltage load in the electric automobile is a low-voltage load and can be divided into a primary load (also called a low-voltage functional safety load) and a secondary load (also called other low-voltage loads) according to functions, the low-voltage functional safety load is a load for maintaining basic functions of the electric automobile, such as a steering wheel power assisting load, a display screen, a VCU (vehicle control unit) and the like, and other low-voltage loads are a vehicle-mounted sound system, a windshield wiper, a low-voltage motor and the like. Because the lithium battery has the advantages of high energy density and long service life, the lithium battery is arranged to supply power for the low-voltage functional safety load, and the basic safety function of the electric automobile is ensured. The second DC/DC module in the second charging loop supplies power to the low voltage functional safety load and other low voltage loads.
Referring to fig. 4, in order to isolate the first and second charging circuits from each other, the output terminal of the second switching module is connected to the secondary load and connected to the primary load through the first switching module.
Referring to fig. 7, in order to improve the power supply guarantee and realize dual power supply, in the preferred embodiment, a second battery E2 is connected between the positive and negative output terminals of the second DC/DC module. Therefore, even if the first charging loop and the second charging loop are damaged, all the functions of all the loads of the whole vehicle can still be normally used in a short time, and the vehicle self-checking reporting in an emergency state plays an important role. The second battery E2 may be a lithium battery or other kinds of batteries.
In the embodiment shown with reference to fig. 5, 6 and 8, a capacitor C2 is connected between the positive and negative output terminals of the second DC/DC module. Note that the capacitor C2 may be replaced by a battery.
Referring to fig. 5, in the preferred embodiment, the output terminal of the first battery E1 is connected in series with a reverse current prevention module, which includes a diode D1, and a failure protection module is connected in series between the first DC/DC module and the first battery E1. When the switch Q1 is turned on, the anti-reflux module can prevent the current in the second charging circuit from impacting the lithium battery, prolong the service life of the lithium battery and ensure the physical independent operation of the first charging circuit and the second charging circuit. The failure protection module can prevent the overshoot caused by the external voltage impacting the battery cell. The fail-safe means may be a diode, but it is not limited thereto, and in addition to a diode, the fail-safe means may be a Mos tube, or another device having the same or similar function, for example, another device having a reasonable one-way conductivity.
Referring to the embodiment shown in fig. 6, the second switching module includes a first switching tube Q1, and the first switching tube Q1 is controlled by the communication and control module. In fig. 5, 6 and 8, the first switch Q1 is disposed in the positive output line of the second switch module, but the first switch Q1 may also be disposed in the negative output line of the second switch module, as shown in fig. 7. The structure can realize the time sequence control and reduce the cost of an external control module of Q1. Specifically, the Q1 is arranged in the positive output circuit, the control end of the switch Q1 needs to be isolated and controlled, the Q1 is arranged in the negative output circuit, and the control end of the Q1 does not need to be isolated, so that the cost is indirectly saved, and the volume is reduced.
To establish physical isolation between the loads of the first and second charging circuits, in the embodiment shown in fig. 6, the first switching module employs an isolation Relay. In the embodiment shown in fig. 8, the first switching module employs a second switching tube Q2 and a third switching tube Q3 connected in series. The first charging loop and the second charging loop are provided with physical isolation between loads, so that the whole low-voltage power supply system can be prevented from being damaged after the primary load circuit and the secondary load circuit are damaged.
Here, for example, the power of the first charging loop is 1KW, which satisfies the charging and primary load (functional safety load) of the lithium battery, and the power provided by the second charging loop is 3KW, which satisfies all low-voltage loads in the vehicle, including the functional safety load, when the second charging loop fails, the first charging loop satisfies the functional safety load of the entire vehicle and cuts off other low-voltage loads, so as to ensure the normal driving safety of the vehicle, and when the first charging loop fails, the second charging loop satisfies all low-voltage loads, so that the vehicle can be used normally.
The invention also designs a control method of the double power supply system based on the electric automobile, wherein the double power supply system adopts the double power supply system based on the electric automobile, and the control method comprises the following steps: the charging system is provided with a two-charging-loop normal mode, a first charging-loop abnormal mode and a second charging-loop abnormal mode, wherein in the two-charging-loop normal mode, the first charging loop and the second charging loop supply power; in the first charging loop abnormal mode, the first charging loop is stopped, and the second charging loop supplies power; in the second charging circuit abnormal mode, the second charging circuit is stopped, and the first charging circuit supplies power.
The control method further comprises the following steps: in the second charging loop abnormal mode, the second switch module is switched off, the battery capacity N of the first battery E1 is detected, the battery capacity N is compared with a capacity threshold value M, when the battery capacity N is larger than or equal to the capacity threshold value M, the first switch module is switched on, and the first battery E1 is used for supplying power to the primary load and the secondary load; and when the battery capacity N is smaller than the capacity threshold value M, the first switch module is switched off, and the first battery E1 is used for supplying power to the primary load. The low-voltage load in the vehicle is classified, the important first-level load or all loads are powered according to the electric quantity of the lithium battery, the power is supplied to the low-voltage load in the vehicle to the maximum extent, users can use various functions in the vehicle conveniently, and meanwhile the power consumption of the first-level load (function safety load) is guaranteed.
Fig. 9 shows a control flow of the preferred embodiment, and the control method specifically includes the following steps:
step 7, detecting the battery power N of the first battery E1;
step 8, comparing whether the battery electric quantity N is larger than an electric quantity threshold value M, if the battery electric quantity N is larger than or equal to the electric quantity threshold value M, turning to step 9, and if the battery electric quantity N is smaller than the electric quantity threshold value M, turning to step 10;
and step 10, disconnecting the first switch module (the battery electric quantity falls to a warning line and only can be provided with a first-level load), and turning to step 7 (continuously monitoring the battery electric quantity N).
Fig. 10 is a waveform diagram of an output when both the first and second charging circuits are operating normally. One horizontal line at the top of the figure is the output voltage waveform of the second charging circuit (DC/DC module 2). The middle horizontal line in the figure is the output voltage waveform of the first charging circuit (DC/DC module 1), which is operating, at output voltage, but not loaded. One horizontal line below the graph is a graph of the voltage waveform (output waveform) measured on the load.
Fig. 11 shows an abnormal condition of the dual power supply system. (a) When the DC/DC module 1 stops outputting, the output oscillogram of each module; (b) when the DC/DC module 1 is abnormally unloaded, the output oscillogram of each module; (c) when the DC/DC module 2 stops outputting, the output oscillogram of each module; (d) and when the DC/DC module 2 is abnormally unloaded, the output waveform diagram of each module. According to the four diagrams, the actual output is stable voltage when any one of the DC/DC module 1 and the DC/DC module 2 has a problem, so that the lithium battery and the load can work normally, namely the two charging loops operate independently without influencing each other, the redundancy of the charging system is increased, and the system safety of the electric automobile is further improved.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (12)
1. A double-power-supply system based on an electric automobile is characterized by comprising a first charging loop and a second charging loop which are connected in parallel between a high-voltage direct-current input end and a low-voltage load in the automobile, wherein a communication and control module is connected between the first charging loop and the second charging loop; the communication and control module detects the states of the first charging circuit and the second charging circuit and cuts off the first charging circuit and/or the second charging circuit to supply power to the low-voltage load in the vehicle according to the states.
2. The electric vehicle-based dual power supply system of claim 1, wherein the first charging loop comprises a first DC/DC module and a first battery E1 connected in series, and the second charging loop comprises a second DC/DC module and a second switching module connected in series.
3. The electric-vehicle-based dual power supply system according to claim 2, wherein the in-vehicle low-voltage load comprises a primary load and a secondary load, the primary load is connected with the first battery E1 and the second switch module, and the secondary load is connected with the second switch module.
4. The electric vehicle-based dual power supply system as claimed in claim 3, wherein the output terminal of the second switch module is connected to the secondary load and is connected to the primary load through the first switch module.
5. The electric-vehicle-based dual power supply system according to claim 4, wherein a second battery E2 is connected between the positive and negative output terminals of the second DC/DC module.
6. The dual electric supply system based on electric vehicle of claim 5, wherein the output terminal of the first battery E1 is connected in series with a reverse flow prevention module, and the reverse flow prevention module comprises a diode D1.
7. The electric vehicle-based dual power supply system of claim 6, wherein the second switching module comprises a first switching tube Q1.
8. The electric vehicle-based dual power supply system as claimed in claim 7, wherein the first switching module employs an isolation Relay, or a second switching tube Q2 and a third switching tube Q3 connected in series.
9. The electric vehicle-based dual power supply system of claim 2, wherein a fail-safe module is connected in series between the first DC/DC module and the first battery E1.
10. A control method of a dual power supply system based on an electric vehicle, wherein the dual power supply system adopts the dual power supply system based on an electric vehicle of any one of claims 1 to 9, the control method comprising: the charging system is provided with a two-charging-loop normal mode, a first charging-loop abnormal mode and a second charging-loop abnormal mode, wherein in the two-charging-loop normal mode, the first charging loop and the second charging loop supply power; in the first charging loop abnormal mode, the first charging loop is stopped, and the second charging loop supplies power; in the second charging circuit abnormal mode, the second charging circuit is stopped, and the first charging circuit supplies power.
11. The control method of an electric vehicle-based dual power supply system according to claim 10, further comprising: in the second charging loop abnormal mode, the second switch module is switched off, the battery capacity N of the first battery E1 is detected, the battery capacity N is compared with a capacity threshold value M, when the battery capacity N is larger than or equal to the capacity threshold value M, the first switch module is switched on, and the first battery E1 is used for supplying power to the primary load and the secondary load; and when the battery capacity N is smaller than the capacity threshold value M, the first switch module is switched off, and the first battery E1 is used for supplying power to the primary load.
12. The control method of an electric vehicle-based dual power supply system according to claim 11, wherein the control method specifically includes the steps of:
step 1, after power-on, operating a first charging loop and a second charging loop;
step 2, checking whether the state of the second charging loop is normal, if the first charging loop and the second charging loop are both normal, turning to the step 3, if the first charging loop is abnormal, turning to the step 4, and if the first charging loop is normal, turning to the step 6;
step 3, switching on the first switch module and the second switch module, and turning to step 2;
step 4, stopping the first charging loop;
step 5, switching on the first switch module and the second switch module;
step 6, switching off the second switch module, switching on the first switch module, stopping running the second charging loop and running the first charging loop;
step 7, detecting the battery power N of the first battery E1;
step 8, comparing whether the battery electric quantity N is larger than an electric quantity threshold value M, if the battery electric quantity N is larger than or equal to the electric quantity threshold value M, turning to step 9, and if the battery electric quantity N is smaller than the electric quantity threshold value M, turning to step 10;
step 9, switching on the first switch module, and turning to step 7;
and step 10, disconnecting the first switch module, and turning to step 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114865777A (en) * | 2022-05-31 | 2022-08-05 | 广州汽车集团股份有限公司 | Vehicle power supply control system and method and automobile |
| CN115042627A (en) * | 2022-07-22 | 2022-09-13 | 北京经纬恒润科技股份有限公司 | Low-voltage dual-power system of electric vehicle and control method |
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2021
- 2021-11-26 CN CN202111422162.0A patent/CN114024363A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114865777A (en) * | 2022-05-31 | 2022-08-05 | 广州汽车集团股份有限公司 | Vehicle power supply control system and method and automobile |
| CN115042627A (en) * | 2022-07-22 | 2022-09-13 | 北京经纬恒润科技股份有限公司 | Low-voltage dual-power system of electric vehicle and control method |
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