CN116278763A - Redundant power supply system and control method thereof - Google Patents
Redundant power supply system and control method thereof Download PDFInfo
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- CN116278763A CN116278763A CN202310399577.3A CN202310399577A CN116278763A CN 116278763 A CN116278763 A CN 116278763A CN 202310399577 A CN202310399577 A CN 202310399577A CN 116278763 A CN116278763 A CN 116278763A
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0092—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption with use of redundant elements for safety purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
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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
- H02J7/00302—Overcharge protection
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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
- H02J7/00306—Overdischarge protection
-
- 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]
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a redundant power supply system and a control method thereof, wherein the system comprises a power battery, a DCDC converter, a main storage battery, a power isolation module and a standby storage battery, wherein the power isolation module is internally provided with a main circuit, a first circuit and a second circuit which are arranged in parallel, one end of the first circuit is connected with a main power supply loop, and the other end of the first circuit is connected with the main circuit; one end of the second circuit is connected with the standby storage battery, and the other end of the second circuit is connected with the bus circuit; the first circuit is provided with a MOSFET Q1 and a MOSFET Q2 in series, and the second circuit is provided with a MOSFET Q3 and a MOSFET Q4 in series; the power isolation module is also provided with a first monitoring circuit, a second monitoring circuit, a first driving circuit and a second driving circuit; the standby storage battery is provided with a battery electric quantity sensor which is in communication connection with the power isolation module. The invention can ensure the normal power utilization of the whole vehicle and the reliability and the service life of the standby storage battery.
Description
Technical Field
The invention belongs to the technical field of vehicle power supply systems, and particularly relates to a redundant power supply system and a control method thereof.
Background
Along with the research of the automatic driving technology, the automatic driving and related modules are required to have higher functional safety levels, such as the requirement of braking and steering functions to have backup redundancy, and the network communication has backup redundancy, so that the automatic driving of the level L3 and above needs to have redundant power supply nodes, when the main power supply system fails, the power supply system needs to be immediately switched to the standby power supply system, so that the single point failure in the traditional vehicle power supply system is avoided, multiple functional failures of the whole vehicle are brought, and the safety and the reliability of the standby power supply system are very important.
The main power supply loop in the existing redundant power supply system is a power supply source composed of a DCDC converter and a low-voltage 12V storage battery, and the standby power supply adopts a standby 12V storage battery. When the main power supply loop fails, the main power supply loop needs to be switched to a standby power supply, the reliability and the safety of the standby power supply are very important, and the safety and the reliability of a standby 12V storage battery are not protected by the prior art. Therefore, how to design a redundant power supply system and a control method thereof to realize the backup of the vehicle power supply system and improve the safety and reliability of the standby power supply at the same time is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a redundant power supply system and a control method thereof, which are used for solving the technical problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the redundant power supply system comprises a power battery, a DCDC converter, a main storage battery, a power isolation module, a standby storage battery and a battery electric quantity sensor, wherein the power battery is electrically connected with the DCDC converter, and the DCDC converter and the main storage battery are arranged on a main power supply loop in parallel; the power isolation module is provided with a main circuit connected with a redundant power supply load, a first circuit and a second circuit which are arranged in parallel, one end of the first circuit is connected with the main power supply loop, and the other end of the first circuit is connected with the main circuit; the standby storage battery is connected with one end of the second circuit through a standby power supply loop, and the other end of the second circuit is connected with the bus circuit; the first circuit is provided with a MOSFET Q1 and a MOSFET Q2 in series, and the second circuit is provided with a MOSFET Q3 and a MOSFET Q4 in series; the power isolation module is also provided with a first monitoring circuit for detecting the main power supply loop, a second monitoring circuit for detecting the standby storage battery and the standby power supply loop, a first driving circuit for controlling the on-off of the MOSFET Q1 and the MOSFET Q2 and a second driving circuit for controlling the on-off of the MOSFET Q3 and the MOSFET Q4; the battery electric quantity sensor is arranged on the standby storage battery and is in communication connection with the power isolation module.
Preferably, the power distribution box further comprises a power distribution box, wherein a plurality of fuses are arranged in parallel in the power distribution box, each redundant power supply load is connected with a main line in the power distribution box through each fuse, and the main line is connected with the main line.
The redundant power supply control method based on the redundant power supply system comprises the following steps:
under normal conditions, the MOSFET Q1, the MOSFET Q2, the MOSFET Q3 and the MOSFET Q4 in the power isolation module are all conducted, and the whole vehicle is powered by a power battery through a DCDC converter; when short-time heavy load occurs, the main storage battery and the standby storage battery participate in short-time discharge;
when a first monitoring circuit in the power isolation module detects that the main power supply loop is in a failure state, the MOSFET Q1 and the MOSFET Q2 are turned off through the first driving circuit, the MOSFET Q3 and the MOSFET Q4 are controlled to be both on through the second driving circuit, and the whole vehicle is only powered by the standby storage battery; when the first monitoring circuit detects that the main power supply loop is recovered to a normal state from a failure state, the MOSFET Q1 and the MOSFET Q2 are controlled to be both conducted through the first driving circuit so as to recover the power supply of the main power supply loop to the redundant power supply load;
when a second monitoring circuit in the power isolation module detects that the standby storage battery or the standby power supply loop is in a failure state, the MOSFET Q3 and the MOSFET Q4 are turned off through a second driving circuit, the MOSFET Q1 and the MOSFET Q2 are controlled to be both on through a first driving circuit, and the whole vehicle is only powered by the main power supply loop; when the second monitoring circuit detects that the standby power supply circuit is recovered to a normal state from a failure state, the second driving circuit controls the MOSFET Q3 and the MOSFET Q4 to be conducted so as to recover the power supply of the standby storage battery to the redundant power supply load.
Preferably, when the main power supply loop and the standby power supply loop are normal, when the standby storage battery discharges through an external load, the battery electric quantity sensor monitors the electric quantity of the standby storage battery in real time and sends electric quantity information of the standby storage battery to the power isolation module, and when the power isolation module receives that the SOC of the standby storage battery sent by the battery electric quantity sensor is smaller than a first set threshold value, the MOSFET Q4 is disconnected through the second driving circuit, and the standby storage battery stops discharging; after the storage battery is charged, when the standby storage battery SOC is larger than a second threshold value, the second driving circuit controls the MOSFET Q4 to be conducted in a recovery mode, and the standby storage battery is allowed to discharge and be charged.
Preferably, the first set threshold is 69% to 71%; the second set threshold is 84% to 86%.
Preferably, when the main power supply loop and the standby power supply loop are normal, the DCDC converter continuously charges the standby storage battery, and when the SOC of the standby storage battery is larger than a third set threshold value, the MOSFET Q3 is disconnected through the second driving circuit, and the charging of the standby storage battery is stopped; after the standby battery is discharged to the outside, when the SOC of the standby battery is smaller than the second set threshold, the MOSFET Q3 is turned on by the second driving circuit, allowing the standby battery to be discharged to the outside and charged.
Preferably, the third set threshold is 94% to 96%.
Preferably, after the vehicle is powered down, the second driving circuit directly turns off the MOSFETs Q3 and Q4, and the whole vehicle is only powered by the main battery.
The invention has the beneficial effects that:
the redundant power supply system and the control method thereof can well realize the switching of the main power supply loop and the standby power supply loop, so that the main power supply loop and the standby power supply loop are mutually backed up, and the power utilization of the whole vehicle can be effectively ensured when the main power supply loop or the standby power supply loop fails, namely is in a failure state; meanwhile, the charging and discharging of the standby storage battery can be controlled, the occurrence of overcharging and overdischarging of the standby storage battery is avoided, and the safety, reliability and service life of the standby storage battery are ensured.
Drawings
For a clearer description of embodiments of the present application or of the prior art, reference will be made briefly to the drawings which are required to be used in the embodiments, and a further detailed description of specific embodiments of the invention will be given with reference to the accompanying drawings, in which
Fig. 1 is a schematic diagram of a redundant power supply system according to an embodiment of the present invention.
The reference numerals in the drawings:
11. a standby power supply loop 12 and a main power supply loop;
21. total wiring, 22, first wiring, 23, second wiring, 24, first driving circuit,
25. a second driving circuit;
31. main line, 32, fuse.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present solution will be described in further detail with reference to specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a redundant power supply system, which includes a power battery, a DCDC converter, a main battery, a power isolation module, a backup battery, and a battery power sensor, where the power battery is electrically connected to the DCDC converter, and the DCDC converter and the main battery are arranged in parallel on a main power supply circuit; the power isolation module is provided with a main circuit 21 connected with a redundant power supply load, a first circuit 22 and a second circuit 23 which are arranged in parallel, one end of the first circuit 22 is connected with the main power supply loop 12, and the other end of the first circuit 22 is connected with the main circuit 21; the standby storage battery is connected with one end of the second circuit 23 through a standby power supply loop 11, and the other end of the second circuit 23 is connected with the main circuit 21; the first circuit 22 is provided with a MOSFET Q1 and a MOSFET Q2 in series, the second circuit 23 is provided with a MOSFET Q3 and a MOSFET Q4 in series, and the power isolation module is also provided with a first monitoring circuit for detecting a main power supply loop, a second monitoring circuit for detecting a standby storage battery and a standby power supply loop, a first driving circuit 24 for controlling the on-off of the MOSFET Q1 and the MOSFET Q2, and a second driving circuit 25 for controlling the on-off of the MOSFET Q3 and the MOSFET Q4; the battery electric quantity sensor is arranged on the standby storage battery and is in communication connection with the power isolation module.
The redundant power supply system provided by the embodiment of the invention can well realize the switching of the main power supply loop and the standby power supply loop, so that the main power supply loop and the standby power supply loop are mutually backed up, and the power consumption of the whole vehicle can be effectively ensured when the main power supply loop or the standby power supply loop fails; meanwhile, the charging and discharging of the standby storage battery can be controlled, the occurrence of overcharging and overdischarging of the standby storage battery is avoided, and the safety, reliability and service life of the standby storage battery are ensured.
Further, the redundant power supply system further comprises a distribution box, wherein a plurality of fuses 32 are arranged in parallel in the distribution box, each redundant power supply load is connected with a main circuit 31 in the distribution box through each fuse, and the main circuit 31 is connected with the main circuit 21. With this arrangement, each redundant power supply load is short-circuited by each fuse. Preferably, the battery power sensor (IBS for short) is in communication connection with the power isolation module through a LIN bus. It will be appreciated that in the embodiment of the present invention, the power battery, the DCDC converter and the main battery are used as the main power source, and the backup battery is used as the backup power source. The power isolation module controls the charge and discharge of the standby storage battery according to the electric quantity information of the standby storage battery sent by the battery electric quantity sensor so as to avoid the phenomenon of overcharge and overdischarge of the standby storage battery, and improve the reliability and service life of the standby storage battery.
Wherein, MOSFET, english is called Metal-Oxide-Semiconductor Field-Effect Transistor, chinese is called: metal-oxide semiconductor field effect transistors, which are a type of controllable switch commonly used in the art.
The embodiment of the invention also provides a redundant power supply control method based on the redundant power supply system, which comprises the following steps:
under normal conditions, namely the main power supply loop and the standby power supply loop have no faults, namely when the main power supply loop and the standby power supply loop are in a normal state, the MOSFET Q1, the MOSFET Q2, the MOSFET Q3 and the MOSFET Q4 in the power isolation module are all conducted, and the whole vehicle is powered by the power battery through the DCDC converter; when short-time heavy load occurs, the main storage battery and the standby storage battery also participate in short-time discharge;
when a first monitoring circuit in the power isolation module detects that the main power supply loop 12 is in a failure state, the MOSFET Q1 and the MOSFET Q2 are turned off through the first driving circuit 24, and when a second monitoring circuit detects that the standby storage battery and the standby power supply loop are in a normal state, the MOSFET Q3 and the MOSFET Q4 are controlled to be both turned on through the second driving circuit 25, and the whole vehicle is only powered by the standby storage battery; when the first monitoring circuit detects that the main power supply loop is recovered to a normal state from a failure state, the MOSFET Q1 and the MOSFET Q2 are controlled to be both conducted through the first driving circuit so as to recover the power supply of the main power supply loop to the redundant power supply load;
when a second monitoring circuit in the power isolation module detects that a standby storage battery or a standby power supply loop 11 breaks down, namely is in a failure state, a MOSFET Q3 and a MOSFET Q4 are turned off through a second driving circuit 25, and when a first monitoring circuit detects that a main power supply loop is in a normal state, a MOSFET Q1 and a MOSFET Q2 are both controlled to be conducted through a first driving circuit, and the whole vehicle is only powered by a main power supply at the moment; when the second monitoring circuit detects that the standby power supply circuit is recovered to a normal state from a failure state, the second driving circuit 25 controls the MOSFET Q3 and the MOSFET Q4 to be both conducted so as to recover the power supply of the standby storage battery to the redundant power supply load.
The redundant power supply control method provided by the embodiment of the invention has the technical effects as well.
Further, when the main power supply loop and the standby power supply loop are normal, when the standby storage battery discharges through an external load, the electric quantity of the standby storage battery is gradually reduced, the battery electric quantity sensor monitors the electric quantity of the standby storage battery in real time, when the power isolation module receives that the SOC of the standby storage battery sent by the battery electric quantity sensor is smaller than a first set threshold value, the MOSFET Q4 is disconnected through the second driving circuit (at the moment, the MOSFET Q3 is still on), and the standby storage battery stops discharging, so that the standby storage battery is prevented from being in an overdischarge state, and the service life of the standby storage battery is ensured; after the battery is charged (at this time, the DCDC converter may charge the backup battery through the body diodes of the MOSFETs Q3 and Q4), when the backup battery SOC is greater than the second threshold value, the MOSFET Q4 is controlled to be turned on by the second driving circuit, allowing the backup battery to be discharged and charged to the outside.
It will be appreciated that in the case where the backup battery and the backup power supply circuit are in a normal state: when the MOSFET Q3 and the MOSFET Q4 are both on, the standby storage battery can supply power to the redundant power supply load, and can charge the standby storage battery at the same time; when the MOSFET Q4 is on and the MOSFET Q3 is off, the current of the standby storage battery can also supply power to the redundant power supply load through the body diodes of the MOSFET Q4 and the MOSFET Q3; when MOSFET Q4 is off but MOSFET Q3 is on, the main power supply can charge the backup battery through the body diodes of MOSFET Q3 and MOSFET Q4.
Specifically, the first set threshold is 69% to 71%, and may preferably be 70%; the second set threshold is 84% to 86%, and may preferably be 85%. It can be understood that SOC (State Of Charge), which is a State Of Charge, is used to reflect the remaining capacity Of a battery, and is defined numerically as the ratio Of the remaining capacity to the battery capacity, and is usually expressed as a percentage.
Further, when the main power supply loop and the standby power supply loop are normal, and the DCDC converter continuously charges the standby storage battery, and when the power isolation module receives that the standby storage battery SOC sent by the IBS is larger than a third set threshold value, the MOSFET Q3 is disconnected through the second driving circuit (at the moment, the MOSFET Q4 is still on), and the standby storage battery is stopped being charged, so that the standby storage battery is prevented from being in an overcharged state, the service life of the standby storage battery is ensured, and the reliability of the standby storage battery is improved; at this time, if the standby battery is required to discharge the outside, the conducting state of the MOSFET Q4 is unchanged, the standby battery can supply power to the redundant power supply load through the body diodes of the MOSFET Q4 and the MOSFET Q3, and if the standby battery is not required to discharge the outside, the MOSFET Q4 is controlled to be turned off through the second driving circuit; after the standby battery discharges outwards, when the IBS detects that the SOC of the standby battery is smaller than the second set threshold, the MOSFET Q3 is turned on by the second driving circuit, allowing the standby battery to discharge outwards and be charged.
Specifically, the third set threshold is 94% to 96%, and may be preferably 95%.
Further, after the vehicle is powered down, that is, the whole vehicle needs to enter a dormant state, the whole vehicle is powered down under high voltage, that is, the DCDC converter also stops working, the whole vehicle is powered by the low-voltage storage battery only, at this time, in order to prevent electric quantity loss caused by the fact that the electric quantity of the main storage battery is inconsistent with that of the standby storage battery, the two storage batteries are mutually charged, and in order to ensure that the standby storage battery is in the high-electric quantity state, after the vehicle is powered down, the second driving circuit directly turns off the MOSFET Q3 and the MOSFET Q4, so that the whole vehicle is powered by the main storage battery only.
It can be understood that the invention considers the charge and discharge protection of the standby storage battery, because the standby storage battery can only provide power when the main power supply loop fails, and the vehicle can only run safely and temporarily only by the standby power supply, because the storage battery has limited electric quantity, the electric quantity and the service life of the standby storage battery are extremely important for ensuring the safe running of the vehicle to the roadside for parking; the charging and discharging protection of the main storage battery is not considered, and the reason is that if the standby power supply fails, the whole vehicle can still be powered by the DCDC converter and the main storage battery, and the DCDC converter can ensure that the vehicle can normally run for a long time.
The invention adopts a novel whole-vehicle redundant power supply scheme, when a main power supply loop fails, the standby power supply can immediately and continuously supply power reliably, so that the driving safety of L3 and above automatic driving vehicles is ensured; the invention adopts a power supply scheme with a standby power supply protection function, the main control unit is a power supply isolation module, and the charging and discharging of the standby power supply are protected by judging the electric quantity information of the standby storage battery sent by IBS, so that the safety and reliability of the standby power supply are ensured; meanwhile, the residual electric quantity of the standby power supply is controlled to be not less than 70%, the deep discharge of the standby storage battery is avoided, and the service life of the standby power supply is greatly prolonged.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, and that various changes and modifications may be made by one skilled in the art after reading the present disclosure, and the equivalent forms thereof fall within the scope of the appended claims.
Claims (8)
1. The redundant power supply system is characterized by comprising a power battery, a DCDC converter, a main storage battery, a power isolation module, a standby storage battery and a battery electric quantity sensor, wherein the power battery is electrically connected with the DCDC converter, and the DCDC converter and the main storage battery are arranged on a main power supply loop in parallel; the power isolation module is provided with a main circuit connected with a redundant power supply load, a first circuit and a second circuit which are arranged in parallel, one end of the first circuit is connected with the main power supply loop, and the other end of the first circuit is connected with the main circuit; the standby storage battery is connected with one end of the second circuit through a standby power supply loop, and the other end of the second circuit is connected with the bus circuit; the first circuit is provided with a MOSFET Q1 and a MOSFET Q2 in series, and the second circuit is provided with a MOSFET Q3 and a MOSFET Q4 in series; the power isolation module is also provided with a first monitoring circuit for detecting the main power supply loop, a second monitoring circuit for detecting the standby storage battery and the standby power supply loop, a first driving circuit for controlling the on-off of the MOSFET Q1 and the MOSFET Q2 and a second driving circuit for controlling the on-off of the MOSFET Q3 and the MOSFET Q4; the battery electric quantity sensor is arranged on the standby storage battery and is in communication connection with the power isolation module.
2. The redundant power supply system of claim 1, further comprising a distribution box, wherein a plurality of fuses are disposed in parallel within the distribution box, each redundant power supply load being connected to a main line within the distribution box via each of the fuses, the main line being connected to the main line.
3. A redundant power supply control method based on the redundant power supply system according to claim 1, characterized by comprising:
under normal conditions, the MOSFET Q1, the MOSFET Q2, the MOSFET Q3 and the MOSFET Q4 in the power isolation module are all conducted, and the whole vehicle is powered by a power battery through a DCDC converter; when short-time heavy load occurs, the main storage battery and the standby storage battery participate in short-time discharge;
when a first monitoring circuit in the power isolation module detects that the main power supply loop is in a failure state, the MOSFET Q1 and the MOSFET Q2 are turned off through the first driving circuit, the MOSFET Q3 and the MOSFET Q4 are controlled to be both on through the second driving circuit, and the whole vehicle is only powered by the standby storage battery; when the first monitoring circuit detects that the main power supply loop is recovered to a normal state from a failure state, the MOSFET Q1 and the MOSFET Q2 are controlled to be both conducted through the first driving circuit so as to recover the power supply of the main power supply loop to the redundant power supply load;
when a second monitoring circuit in the power isolation module detects that the standby storage battery or the standby power supply loop is in a failure state, the MOSFET Q3 and the MOSFET Q4 are turned off through a second driving circuit, the MOSFET Q1 and the MOSFET Q2 are controlled to be both on through a first driving circuit, and the whole vehicle is only powered by the main power supply loop; when the second monitoring circuit detects that the standby power supply circuit is recovered to a normal state from a failure state, the second driving circuit controls the MOSFET Q3 and the MOSFET Q4 to be conducted so as to recover the power supply of the standby storage battery to the redundant power supply load.
4. The redundant power supply control method according to claim 3, wherein when the main power supply loop and the backup power supply loop are normal, when the backup battery is discharged through an external load, the battery power sensor monitors the power of the backup battery in real time and sends the power information of the backup battery to the power isolation module, and when the power isolation module receives that the SOC of the backup battery sent by the battery power sensor is smaller than a first set threshold, the MOSFET Q4 is turned off through the second driving circuit, and the backup battery stops discharging; after the storage battery is charged, when the standby storage battery SOC is larger than a second threshold value, the second driving circuit controls the MOSFET Q4 to be conducted in a recovery mode, and the standby storage battery is allowed to discharge and be charged.
5. The redundant power supply control method of claim 4, wherein the first set threshold is 69% to 71%; the second set threshold is 84% to 86%.
6. The redundant power supply control method according to claim 4, wherein the DCDC converter continuously charges the backup battery when both the main power supply loop and the backup power supply loop are normal, and turns off the MOSFET Q3 through the second driving circuit to stop charging the backup battery when the backup battery SOC is greater than a third set threshold; after the standby battery is discharged to the outside, when the SOC of the standby battery is smaller than the second set threshold, the MOSFET Q3 is turned on by the second driving circuit, allowing the standby battery to be discharged to the outside and charged.
7. The redundant power supply control method of claim 6, wherein the third set threshold is 94% to 96%.
8. A redundant power supply control method according to claim 3, wherein the second drive circuit directly turns off the MOSFETs Q3, Q4 after the vehicle is powered down, and the entire vehicle is powered only by the main battery.
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