CN113787912A - Vehicle low-voltage power supply system and method - Google Patents
Vehicle low-voltage power supply system and method Download PDFInfo
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- CN113787912A CN113787912A CN202111093021.9A CN202111093021A CN113787912A CN 113787912 A CN113787912 A CN 113787912A CN 202111093021 A CN202111093021 A CN 202111093021A CN 113787912 A CN113787912 A CN 113787912A
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- power supply
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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
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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
- B60L3/04—Cutting off the power supply under fault conditions
Abstract
The application discloses a vehicle low-voltage power supply system and method, which can reduce the cost of vehicle low-voltage power supply. Relate to vehicle technical field, vehicle low pressure power supply system includes: a high voltage power supply; a voltage converter in series with the high voltage power supply; a low-voltage power supply, wherein a change-over switch is arranged between the low-voltage power supply and the voltage converter; the low-voltage power supply switch module is electrically connected with the voltage converter and the low-voltage power supply respectively; and the low-voltage electric appliance is electrically connected with the low-voltage power supply switch module.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a vehicle low-voltage power supply system and method.
Background
When the intelligent driving vehicle is provided with L3 and above advanced functions, redundancy needs to be arranged on the low-voltage power supply, so that when a single set of low-voltage power supply fails, safe driving and parking of the vehicle can still be guaranteed.
However, the cost of the existing redundancy scheme for low voltage power supplies is relatively high.
Disclosure of Invention
The embodiment of the application provides a vehicle low-voltage power supply system and method, which can reduce the cost of vehicle low-voltage power supply.
In a first aspect of the embodiments of the present application, there is provided a vehicle low-voltage power supply system, including:
a high voltage power supply;
a voltage converter in series with the high voltage power supply;
a low-voltage power supply, wherein a change-over switch is arranged between the low-voltage power supply and the voltage converter;
the low-voltage power supply switch module is electrically connected with the voltage converter and the low-voltage power supply respectively;
and the low-voltage electric appliance is electrically connected with the low-voltage power supply switch module.
In some embodiments, further comprising:
the low-voltage power supply control module is electrically connected with the voltage converter, the change-over switch and the low-voltage power supply respectively;
the low-voltage power supply control module is used for monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply and monitoring the running state of the low-voltage power supply, and the low-voltage power supply control module is used for controlling the on and off of the change-over switch.
In some embodiments, the low-voltage electrical appliances are multiple ones, and the multiple low-voltage electrical appliances are classified into non-essential vehicle type low-voltage electrical appliances and essential vehicle type low-voltage electrical appliances;
the low-voltage power supply switch module comprises at least two power supply switches, and each power supply switch is electrically connected with at least one low-voltage electrical appliance;
the low-voltage power supply switch module is used for controlling the disconnection of the power supply switch corresponding to the non-essential driving type low-voltage electric appliance when the power supply state of the series circuit of the voltage converter and the high-voltage power supply fails so as to stop supplying power to the non-essential driving type low-voltage electric appliance.
In some embodiments, the low-voltage power supply control module is electrically connected to the low-voltage power supply switch module, and is further configured to send an off instruction to the low-voltage power supply switch module to control the power supply switch corresponding to the non-essential-vehicle-type low-voltage electrical equipment to be turned off when a power supply state of a series circuit of the voltage converter and the high-voltage power supply fails.
In some embodiments, the high voltage power source is a high voltage battery having a supply voltage in the range of 380V to 800V;
the low-voltage power supply is a low-voltage storage battery, and the power supply voltage range of the low-voltage storage battery is 12V-13.5V.
In a second aspect of the embodiments of the present application, there is provided a low-voltage power supply method for a vehicle, which is applied to the low-voltage power supply system for a vehicle according to the first aspect, and the method includes:
when a series circuit of a high-voltage power supply and a voltage converter supplies power to a low-voltage electric appliance through a low-voltage power supply switch module, the low-voltage power supply supplies power to the low-voltage electric appliance through the low-voltage power supply switch module;
monitoring the electric quantity of the low-voltage power supply;
and if the electric quantity of the low-voltage power supply is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, controlling a change-over switch to be switched on so that the high-voltage power supply charges the low-voltage power supply through the voltage converter.
In some embodiments, the low-voltage electrical loads are classified into non-essential-vehicle type low-voltage electrical loads and essential-vehicle type low-voltage electrical loads, the low-voltage power switch module includes at least two power switches, each power switch is electrically connected to at least one low-voltage electrical load, and the method further includes:
monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply;
if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the power supply of the non-essential driving low-voltage electric appliances is stopped by controlling the power supply switches corresponding to the non-essential driving low-voltage electric appliances to be switched off.
In some embodiments, the monitoring the charge of the low voltage power source comprises:
monitoring the electric quantity of the low-voltage power supply through the low-voltage power supply control module;
the monitoring of the power supply state of the series circuit of the voltage converter and the high voltage power supply includes:
and monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply through a low-voltage power supply control module.
In some embodiments, if it is monitored that the power of the low-voltage power supply is lower than a set power or the low-voltage power supply is fed, controlling a switch to be closed so that the high-voltage power supply charges the low-voltage power supply through a voltage converter includes:
if the electric quantity of the low-voltage power supply is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, the low-voltage power supply control module sends a closing instruction to the change-over switch;
and the change-over switch is closed according to the closing instruction, so that the high-voltage power supply charges the low-voltage power supply through the voltage converter.
In some embodiments, if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be failed, the method for stopping power supply to the non-essential driving type low-voltage electric appliances by controlling the power supply switches corresponding to the non-essential driving type low-voltage electric appliances to be turned off includes:
if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the low-voltage power supply control module sends an unnecessary disconnection instruction to the low-voltage power supply switch module;
and the low-voltage power supply switch module controls the power supply switch corresponding to the non-essential driving low-voltage electric appliance to be switched off according to the non-essential driving low-voltage electric appliance disconnection instruction so as to stop supplying power to the non-essential driving low-voltage electric appliance.
According to the vehicle low-voltage power supply system and the vehicle low-voltage power supply method, the low-voltage power supply switch module is arranged to be electrically connected with the voltage converter and the low-voltage power supply respectively, and the low-voltage electric appliance is electrically connected with the low-voltage power supply switch module. Under the condition of normal operation of vehicle low pressure power supply system, when the series circuit of high voltage power supply and voltage converter passes through low pressure power supply switch module to the low pressure with the electrical apparatus power supply, low voltage power supply is also passing through low pressure power supply switch module to the low pressure with the electrical apparatus power supply, can understand that there are two power supply lines for the low pressure with the electrical apparatus power supply, can realize the stable power supply to the low pressure with the electrical apparatus, if arbitrary power supply line breaks down or the electric quantity exhausts, another power supply line can also supply power for the low pressure with the electrical apparatus, can not influence the normal use of the low pressure with the electrical apparatus, in order to guarantee the driving safety of vehicle. Through setting up voltage converter, can only need a high voltage power supply and a low voltage power supply to the low pressure electrical apparatus power supply simultaneously, need two sets of high-pressure DCDC and single lead-acid battery for prior art, or single set DCDC and two lead-acid battery, lead-acid battery uses as low voltage battery usually, the vehicle low pressure power supply system that this application embodiment provided can save one set of voltage converter or save a low voltage power supply, therefore, the vehicle low pressure power supply system that this application embodiment provided can practice thrift the cost of low pressure power supply, can also reduce the quantity of low pressure power supply device, in order to reduce occupation space. In addition, if the electric quantity of the low-voltage power supply is insufficient, the high-voltage power supply, the voltage converter and the low-voltage power supply can form a passage by closing the change-over switch, so that the high-voltage power supply charges the low-voltage power supply through the voltage converter, two power supply lines can be ensured to supply power for the low-voltage electrical appliance, and stable power supply for the low-voltage electrical appliance can be realized.
Drawings
Fig. 1 is a schematic structural block diagram of a vehicle low-voltage power supply system provided in an embodiment of the present application;
FIG. 2 is a schematic block diagram of another low-voltage power supply system for a vehicle according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a vehicle low-voltage power supply method provided by an embodiment of the application.
Detailed Description
In order to better understand the technical solutions provided by the embodiments of the present specification, the technical solutions of the embodiments of the present specification are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations on the technical solutions of the embodiments of the present specification, and the technical features in the embodiments and examples of the present specification may be combined with each other without conflict.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The term "two or more" includes the case of two or more.
When the intelligent driving vehicle is provided with L3 and above advanced functions, redundancy needs to be arranged on the low-voltage power supply, so that when a single set of low-voltage power supply fails, safe driving and parking of the vehicle can still be guaranteed. However, the existing redundancy scheme of the low-voltage power supply has higher cost and larger occupied space, and is difficult to arrange on the whole vehicle.
In view of this, embodiments of the present application provide a vehicle low-voltage power supply system and method, which can reduce the cost of vehicle low-voltage power supply.
In a first aspect of the embodiments of the present application, a vehicle low-voltage power supply system is provided, and fig. 1 is a schematic structural block diagram of the vehicle low-voltage power supply system provided in the embodiments of the present application. As shown in fig. 1, a vehicle low-voltage power supply system provided in an embodiment of the present application includes: a high voltage power supply 100; a voltage converter 200, the voltage converter 200 being connected in series with the high voltage power supply 100; a low voltage power supply 300, a switch 400 is arranged between the low voltage power supply 300 and the voltage converter 200; the low-voltage power supply switch module 500, the low-voltage power supply switch module 500 is electrically connected with the voltage converter 200 and the low-voltage power supply 300 respectively; the low-voltage electrical appliance 600 is electrically connected with the low-voltage power supply switch module 500 through the low-voltage electrical appliance 600.
Illustratively, as shown in fig. 1, the voltage converter 200 may be configured to convert a high voltage output from the high-voltage power supply 100 into a low voltage that can be used by the low-voltage electrical appliance 600, and illustratively, if the supply voltage required by the low-voltage electrical appliance 600 is 12V, the voltage output from the voltage converter 200 is 12V, and the supply voltage output from the low-voltage power supply 300 is also 12V. The voltage converter 200 may be a direct current voltage converter, i.e., DCDC. Under the condition of normal operation of the vehicle low-voltage power supply system, when the series circuit of the high-voltage power supply 100 and the voltage converter 200 supplies power to the low-voltage electrical appliance 600 through the low-voltage power supply switch module 500, the low-voltage power supply 300 also supplies power to the low-voltage electrical appliance 600 through the low-voltage power supply switch module 500, namely, the power supply of the low-voltage electrical appliance 600 can be realized by understanding that two power supply lines are provided, the stable power supply of the low-voltage electrical appliance 600 can be realized, if any power supply line breaks down or the electric quantity is exhausted, the other power supply line can also supply power to the low-voltage electrical appliance 600, the normal use of the low-voltage electrical appliance 600 cannot be influenced, and the driving safety of the vehicle is ensured. In addition, if the electric quantity of the low voltage power supply 300 is insufficient, the high voltage power supply 100, the voltage converter 200 and the low voltage power supply 300 can form a channel by closing the switch 400, so that the high voltage power supply 100 charges the low voltage power supply 300 through the voltage converter 200, two power supply lines can be ensured to supply power for the low voltage electrical appliance 600, and stable power supply for the low voltage electrical appliance 600 can be realized.
The vehicle low-voltage power supply system provided by the embodiment of the application is electrically connected with the voltage converter 200 and the low-voltage power supply 300 respectively by arranging the low-voltage power supply switch module 500, and the low-voltage electrical appliance 600 is electrically connected with the low-voltage power supply switch module 500. Under the condition of normal operation of the vehicle low-voltage power supply system, when the series circuit of the high-voltage power supply 100 and the voltage converter 200 supplies power to the low-voltage electrical appliance 600 through the low-voltage power supply switch module 500, the low-voltage power supply 300 also supplies power to the low-voltage electrical appliance 600 through the low-voltage power supply switch module 500, namely, the power supply of the low-voltage electrical appliance 600 can be realized by understanding that two power supply lines are provided, the stable power supply of the low-voltage electrical appliance 600 can be realized, if any power supply line breaks down or the electric quantity is exhausted, the other power supply line can also supply power to the low-voltage electrical appliance 600, the normal use of the low-voltage electrical appliance 600 cannot be influenced, and the driving safety of the vehicle is ensured. Through setting up voltage converter 200, can only need a high voltage power supply 100 and a low voltage power supply 300 to the low voltage with electrical apparatus 600 power supply simultaneously, need two sets of high voltage DCDC and single lead-acid battery for prior art, or single set DCDC and two lead-acid battery, lead-acid battery uses as low voltage battery usually, the vehicle low pressure power supply system that this application embodiment provided can save one set of voltage converter 200 or save a low voltage power supply 300, therefore, the vehicle low pressure power supply system that this application embodiment provided can practice thrift the cost of low voltage power supply, can also reduce the quantity of low voltage power supply device, in order to reduce occupation space. In addition, if the electric quantity of the low voltage power supply 300 is insufficient, the high voltage power supply 100, the voltage converter 200 and the low voltage power supply 300 can form a channel by closing the switch 400, so that the high voltage power supply 100 charges the low voltage power supply 300 through the voltage converter 200, two power supply lines can be ensured to supply power for the low voltage electrical appliance 600, and stable power supply for the low voltage electrical appliance 600 can be realized.
In some embodiments, the vehicle low-voltage power supply system provided in the embodiments of the present application further includes: the low-voltage power supply control module is respectively connected with the voltage converter, the change-over switch and the low-voltage power supply; the low-voltage power supply control module is used for monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply and monitoring the running state of the low-voltage power supply, and the low-voltage power supply control module is used for controlling the opening and closing of the change-over switch.
For example, fig. 2 is a schematic structural block diagram of another vehicle low-voltage power supply system provided in an embodiment of the present application. As shown in fig. 2, the low voltage power supply control module 700 is electrically connected to the voltage converter 200, the switch 400 and the low voltage power supply 300, respectively; the low voltage power supply control module 700 is used to monitor the power supply state of the series circuit of the voltage converter 200 and the high voltage power supply 100 and to monitor the operation state of the low voltage power supply 300, and the low voltage power supply control module 700 is used to control the opening and closing of the change-over switch 400. If the power of the low voltage power supply 300 is detected to be lower than the set power or the low voltage power supply is fed, the low voltage power supply control module 700 may control the switch 400 to be closed, so that the high voltage power supply 100 charges the low voltage power supply 300 through the voltage converter 200. The low voltage power control module 700 may also monitor the power of the low voltage power source 300, and the low voltage power control module 700 may also be used to monitor the operation of the series circuit of the high voltage power source 100 and the voltage converter 200.
The vehicle low-voltage power supply system provided by the embodiment of the application can intelligently and automatically monitor the electric quantity of the low-voltage power supply 300 and the operation condition of the series circuit of the high-voltage power supply 100 and the voltage converter 200 by arranging the low-voltage power supply control module 700, and when the electric quantity of the low-voltage power supply 300 is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, the low-voltage power supply control module 700 controls the switch 400 to be switched on, so that the high-voltage power supply 100 charges the low-voltage power supply 300 through the voltage converter 200. Can realize intelligent monitoring and intelligent control to and guarantee through intelligent monitoring and intelligent control that there are two power supply lines for the low pressure supplies power with electrical apparatus 600, can realize the stable power supply with electrical apparatus 600 to the low pressure.
In some embodiments, the low-voltage electrical appliances are multiple, and the multiple low-voltage electrical appliances are classified into non-essential vehicle type low-voltage electrical appliances and essential vehicle type low-voltage electrical appliances; the low-voltage power supply switch module comprises at least two power supply switches, and each power supply switch is electrically connected with at least one low-voltage electrical appliance; the low-voltage power supply switch module is used for controlling the disconnection of the power supply switch corresponding to the non-essential-driving low-voltage electric appliance when the power supply state of the series circuit of the voltage converter and the high-voltage power supply fails so as to stop supplying power to the non-essential-driving low-voltage electric appliance.
Illustratively, with continued reference to fig. 2, the low-voltage consumer 600 is a plurality of low-voltage consumers, which may be, for example, a first low-voltage consumer, a second low-voltage consumer, a third low-voltage consumer, a fourth low-voltage consumer, a fifth low-voltage consumer, and a sixth low-voltage consumer. The low-voltage electric appliances 600 can be classified into non-essential driving type low-voltage electric appliances and essential driving type low-voltage electric appliances; for example, the second low-voltage electrical device, the third low-voltage electrical device and the fifth low-voltage electrical device may be low-voltage electrical devices of the type requiring driving, and the first low-voltage electrical device, the fourth low-voltage electrical device and the sixth low-voltage electrical device may be low-voltage electrical devices of the type not requiring driving. The unnecessary low-voltage electric appliances for vehicles can comprise entertainment sound, a heating seat, interior lighting, a music player, a video player, a radio and the like. The necessary driving type low-voltage electric appliances may include an electric power steering, an electric power brake, ADAS related sensors and processors, and the like, and the embodiments of the present application are not particularly limited. The low-voltage electric appliances of the necessary driving type are low-voltage electric appliances which are necessary to be used in the driving process, the low-voltage electric appliances of the unnecessary driving type are low-voltage electric appliances which can not be used in the driving process, when the power supply state of the series circuit of the high-voltage power supply 100 and the voltage converter 200 breaks down, only the low-voltage power supply 300 supplies power to the low-voltage electric appliances of the unnecessary driving type, the storage capacity of the low-voltage power supply 300 is small, in order to save power to ensure that the necessary low-voltage electric appliances in the driving can normally operate, the low-voltage electric appliances of the unnecessary driving type can be closed, namely, the power supply to the low-voltage electric appliances of the unnecessary driving type is stopped, when the power supply state of the series circuit of the high-voltage power supply 100 and the voltage converter 200 breaks down, the electric energy is saved, the normal operation time of the low-voltage electric appliances of the necessary driving type is prolonged to the utmost extent, and the driving safety is ensured. The power supply state of the series circuit of the high voltage power supply 100 and the voltage converter 200 may be a failure of the high voltage power supply 100, a failure of the voltage converter 200, or a failure of the connection between the high voltage power supply 100 and the voltage converter 200, and the power supply state of the series circuit of the high voltage power supply 100 and the voltage converter 200 may be monitored by monitoring the output voltage, the output current, the output power, or the voltage stability of the series circuit of the high voltage power supply 100 and the voltage converter 200, which is not particularly limited in the embodiment of the present application.
For example, each low-voltage electrical appliance 600 may be correspondingly connected to one power supply switch, or all non-essential driving type low-voltage electrical appliances may be correspondingly connected to one power supply switch, and all essential driving type low-voltage electrical appliances are correspondingly connected to one power supply switch; or part of the unnecessary driving type low-voltage electric appliances are correspondingly connected with one power supply switch, and part of the necessary driving type electric appliances are correspondingly connected with one power supply switch, and the embodiment of the application is not particularly limited with respect to the connection and the setting of the power supply switch.
In the low-voltage power supply system for the vehicle provided by the embodiment of the application, the plurality of low-voltage electric appliances 600 are divided into non-essential driving type low-voltage electric appliances and essential driving type low-voltage electric appliances; each power supply switch is connected with at least one low-voltage electric appliance 600; the low voltage power supply switch module 500 is configured to stop power supply to the unnecessary driving type low voltage electrical equipment by controlling the disconnection of the power supply switch corresponding to the unnecessary driving type low voltage electrical equipment when the power supply state of the series circuit of the voltage converter 200 and the high voltage power supply 100 fails. When the power supply state of the series circuit of the high-voltage power supply 100 and the voltage converter 200 is failed, only the low-voltage power supply 300 supplies power to the low-voltage electric appliances 600, the low-voltage power supply 300 has less storage capacity, and in order to save power and ensure normal operation of the low-voltage electric appliances necessary in driving, the low-voltage electric appliances which are not necessary in driving can be turned off, namely, the power supply to the low-voltage electric appliances which are not necessary in driving is stopped, so that when the power supply state of the series circuit of the high-voltage power supply 100 and the voltage converter 200 is failed, the electric energy is saved, and the normal operation time of the low-voltage electric appliances necessary in driving is prolonged to the maximum extent, so that the driving safety is ensured.
In some embodiments, the low-voltage power supply control module is electrically connected to the low-voltage power supply switch module, and the low-voltage power supply control module is further configured to send a disconnection instruction to the low-voltage power supply switch module to control a power supply switch corresponding to an unnecessary vehicle-type low-voltage electrical appliance to be disconnected when a power supply state of a series circuit of the voltage converter and the high-voltage power supply fails.
For example, with reference to fig. 2, the low voltage power supply control module 700 is electrically connected to the low voltage power supply switch module 500, the low voltage power supply control module 700 is further configured to send a disconnection instruction to the low voltage power supply switch module 500 when a power supply state of the series circuit of the voltage converter 200 and the high voltage power supply 100 fails, and the low voltage power supply switch module 500 controls the power supply switch corresponding to the non-essential driving low voltage electrical equipment to be disconnected according to the disconnection instruction, so as to stop power supply to the non-essential driving low voltage electrical equipment.
The vehicle low-voltage power supply system provided by the embodiment of the application can realize the monitoring of the low-voltage power supply control module 700 on the power supply state of the series circuit of the voltage converter 200 and the high-voltage power supply 100 by setting the low-voltage power supply control module 700 when the power supply state of the series circuit of the voltage converter 200 and the high-voltage power supply 100 fails, and meanwhile, a disconnection instruction is generated when the power supply state of the series circuit of the voltage converter 200 and the high-voltage power supply 100 fails and is sent to the low-voltage power supply switch module 500, and the disconnection instruction can control the disconnection of a power supply switch corresponding to an unnecessary driving type low-voltage electric appliance. The intelligent monitoring and intelligent control power supply can be realized, the electric energy is saved, and the normal operation time of the low-voltage electric appliance for driving is prolonged to the maximum extent so as to ensure the driving safety.
For example, the low voltage power control module 700 may be used to control the power supply to the low voltage electrical appliances by controlling the closing and opening of the power switch. For example, when a user turns off a part of the low-voltage electrical appliances 600, the low-voltage power supply control module 700 may control the power supply switches corresponding to the turned-off low-voltage electrical appliances to be turned off, so as to avoid the consumption of quiescent current and save the low-voltage energy consumption of the entire vehicle.
In some embodiments, the high voltage power supply 100 is a high voltage battery having a supply voltage in the range of 380V to 800V; the high voltage battery may be a 450V battery. The low voltage power supply 300 is a low voltage battery having a supply voltage range of 12V to 13.5V. The low-voltage storage battery may be a lead-acid battery, and specifically may be a 12V lead-acid battery, and the embodiment of the present application is not particularly limited.
In a second aspect of the embodiments of the present application, a vehicle low-voltage power supply method is provided, where the vehicle low-voltage power supply system is applied to the vehicle low-voltage power supply system according to the first aspect, and fig. 3 is a schematic flowchart of the vehicle low-voltage power supply method provided in the embodiments of the present application. As shown in fig. 3, a low-voltage power supply method for a vehicle provided in an embodiment of the present application includes:
s100: when the series circuit of the high-voltage power supply and the voltage converter supplies power to the low-voltage electric appliance through the low-voltage power supply switch module, the low-voltage power supply supplies power to the low-voltage electric appliance through the low-voltage power supply switch module. With reference to fig. 1, it can be understood that two power supply lines supply power to the low-voltage electrical appliance 600, so that stable power supply to the low-voltage electrical appliance 600 can be realized, if any power supply line fails or the electric quantity is exhausted, the other power supply line can supply power to the low-voltage electrical appliance 600, and the normal use of the low-voltage electrical appliance 600 cannot be affected, so as to ensure the driving safety of a vehicle.
S200: the electric quantity of the low-voltage power supply is monitored.
S300: and if the electric quantity of the low-voltage power supply is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, controlling the switch to be switched on so that the high-voltage power supply charges the low-voltage power supply through the voltage converter. The set amount of electricity may be 100%, 90%, or 80%, and the embodiment of the present application is not particularly limited. With reference to fig. 1, if the low voltage power supply 300 is insufficient in power, the high voltage power supply 100, the voltage converter 200 and the low voltage power supply 300 may form a path by closing the switch 400, so that the high voltage power supply 100 charges the low voltage power supply 300 through the voltage converter 200, two power supply lines may be ensured to supply power to the low voltage electrical appliance 600, and stable power supply to the low voltage electrical appliance 600 may be realized.
The vehicle low-voltage power supply method provided by the embodiment of the application, under the condition that a vehicle low-voltage power supply system normally operates, when a series circuit of a high-voltage power supply 100 and a voltage converter 200 supplies power to a low-voltage electric appliance 600 through a low-voltage power supply switch module 500, the low-voltage power supply 300 also supplies power to the low-voltage electric appliance 600 through the low-voltage power supply switch module 500, namely, the power can be stably supplied to the low-voltage electric appliance 600 by understanding that two power supply lines exist, if any power supply line breaks down or the electric quantity is exhausted, the other power supply line can also supply power to the low-voltage electric appliance 600, the normal use of the low-voltage electric appliance 600 cannot be influenced, and the driving safety of a vehicle is ensured. Through voltage converter 200, can only need a high voltage power supply 100 and a low voltage power supply 300 to supply power to low voltage electrical apparatus 600 simultaneously, need two sets of high voltage DCDC and single lead-acid battery for prior art, or single set DCDC and two lead-acid battery, lead-acid battery uses as low voltage battery usually, the vehicle low voltage power supply method that this application embodiment provided can save one set of voltage converter 200 or save a low voltage power supply 300, therefore, the vehicle low voltage power supply method that this application embodiment provided can practice thrift the cost of low voltage power supply, can also reduce the quantity of low voltage power supply device, in order to reduce occupation space. In addition, if the electric quantity of the low voltage power supply 300 is insufficient, the high voltage power supply 100, the voltage converter 200 and the low voltage power supply 300 can form a channel by closing the switch 400, so that the high voltage power supply 100 charges the low voltage power supply 300 through the voltage converter 200, two power supply lines can be ensured to supply power for the low voltage electrical appliance 600, and stable power supply for the low voltage electrical appliance 600 can be realized.
In some embodiments, the low-voltage electrical loads are classified into non-essential-vehicle type low-voltage electrical loads and essential-vehicle type low-voltage electrical loads, the low-voltage power switch module comprises at least two power switches, each power switch is electrically connected to at least one low-voltage electrical load, and the method further comprises:
monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply;
if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the power supply of the unnecessary driving type low-voltage electric appliances is stopped by controlling the power supply switches corresponding to the unnecessary driving type low-voltage electric appliances to be disconnected. Referring to fig. 2, the low-voltage electric appliances of the type that must drive a vehicle must be used during driving, and the low-voltage electric appliances of the type that do not necessarily drive a vehicle must be used during driving, and when the power supply state of the series circuit of the high-voltage power supply 100 and the voltage converter 200 fails, only the low-voltage power supply 300 supplies power to the low-voltage electric appliances of the type that do not necessarily drive a vehicle, and the low-voltage electric appliances of the low-voltage electric supplies power, and the low-voltage electric appliances of the non-voltage electric appliances of the low-voltage electric appliances of the high-voltage electric appliances of the necessarily drive a vehicle must be turned off, and the low-voltage electric appliances of the high-voltage electric appliances of the non-voltage electric appliances of the high-voltage electric appliances of the unnecessary electric appliances of the high-voltage electric appliances of the unnecessary electric appliances of the high-driving vehicles can be turned-voltage electric appliances of the high-driving vehicles can be turned electric appliances of the low-driven vehicles to be turned electric vehicles to be turned-driven vehicles to be turned-. The power supply state of the series circuit of the high voltage power supply 100 and the voltage converter 200 may be a failure of the high voltage power supply 100, a failure of the voltage converter 200, or a failure of the connection between the high voltage power supply 100 and the voltage converter 200, and the power supply state of the series circuit of the high voltage power supply 100 and the voltage converter 200 may be monitored by monitoring the output voltage, the output current, the output power, or the voltage stability of the series circuit of the high voltage power supply 100 and the voltage converter 200, which is not particularly limited in the embodiment of the present application.
In some embodiments, monitoring the charge of the low voltage power supply may include:
and monitoring the electric quantity of the low-voltage power supply through the low-voltage power supply control module.
Monitoring the power supply state of a series circuit of a voltage converter and a high voltage power supply, comprising:
and monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply through the low-voltage power supply control module.
The vehicle low-voltage power supply method provided by the embodiment of the application refers to fig. 2, and by means of the low-voltage power supply control module 700, the electric quantity of the low-voltage power supply 300 can be intelligently and automatically monitored, the operation condition of the series circuit of the high-voltage power supply 100 and the voltage converter 200 can be monitored, intelligent monitoring and intelligent control can be realized, two power supply lines are guaranteed to supply power for the low-voltage electric appliance 600 through intelligent monitoring and intelligent control, and stable power supply for the low-voltage electric appliance 600 can be realized.
In some embodiments, step S300 may include:
if the electric quantity of the low-voltage power supply is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, the low-voltage power supply control module sends a closing instruction to the change-over switch;
and the change-over switch is closed according to the closing instruction, so that the high-voltage power supply charges the low-voltage power supply through the voltage converter.
If the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the power supply to the non-essential driving type low-voltage electric appliances is stopped by controlling the disconnection of the power supply switches corresponding to the non-essential driving type low-voltage electric appliances, and the method comprises the following steps:
if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the low-voltage power supply control module sends an unnecessary disconnection instruction to the low-voltage power supply switch module;
and the low-voltage power supply switch module controls the power supply switch corresponding to the non-essential driving type low-voltage electric appliance to be switched off according to the non-essential driving type switching-off instruction so as to stop supplying power to the non-essential driving type low-voltage electric appliance.
Referring to fig. 2, a low-voltage power supply control module 700 monitors a power supply state of a series circuit of a voltage converter 200 and a high-voltage power supply 100 and an electric quantity of a low-voltage power supply 300, and when it is monitored that the power supply state of the series circuit of the voltage converter 200 and the high-voltage power supply 100 fails, the low-voltage power supply control module 700 sends an unnecessary disconnection instruction to a low-voltage power supply switch module 500; when it is detected that the power amount of the low voltage power supply 300 is lower than the set power amount or the low voltage power supply is fed, the low voltage power supply control module 700 sends a closing command to the switch 400. The intelligent monitoring and intelligent control power supply can be realized, the electric energy is saved, and the normal operation time of the low-voltage electric appliance for driving is prolonged to the maximum extent so as to ensure the driving safety.
While preferred embodiments of the present specification have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all changes and modifications that fall within the scope of the specification.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present specification without departing from the spirit and scope of the specification. Thus, if such modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, the specification is intended to include such modifications and variations.
Claims (10)
1. A vehicle low voltage power supply system, comprising:
a high voltage power supply;
a voltage converter in series with the high voltage power supply;
a low-voltage power supply, wherein a change-over switch is arranged between the low-voltage power supply and the voltage converter;
the low-voltage power supply switch module is electrically connected with the voltage converter and the low-voltage power supply respectively;
and the low-voltage electric appliance is electrically connected with the low-voltage power supply switch module.
2. The vehicle low voltage power supply system according to claim 1, further comprising:
the low-voltage power supply control module is electrically connected with the voltage converter, the change-over switch and the low-voltage power supply respectively;
the low-voltage power supply control module is used for monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply and monitoring the running state of the low-voltage power supply, and the low-voltage power supply control module is used for controlling the on and off of the change-over switch.
3. The vehicle low-voltage power supply system according to claim 2, wherein the low-voltage electrical appliances are a plurality of low-voltage electrical appliances, and the low-voltage electrical appliances are classified into non-essential vehicle type low-voltage electrical appliances and essential vehicle type low-voltage electrical appliances;
the low-voltage power supply switch module comprises at least two power supply switches, and each power supply switch is electrically connected with at least one low-voltage electrical appliance;
the low-voltage power supply switch module is used for controlling the disconnection of the power supply switch corresponding to the non-essential driving type low-voltage electric appliance when the power supply state of the series circuit of the voltage converter and the high-voltage power supply fails so as to stop supplying power to the non-essential driving type low-voltage electric appliance.
4. The vehicle low-voltage power supply system according to claim 3, wherein the low-voltage power supply control module is electrically connected to the low-voltage power supply switch module, and is further configured to send an off command to the low-voltage power supply switch module to control the power supply switch corresponding to the non-essential-vehicle-type low-voltage electric appliance to be turned off when a power supply state of a series circuit of the voltage converter and the high-voltage power supply fails.
5. The vehicle low-voltage power supply system according to any one of claims 1 to 4, characterized in that the high-voltage power supply is a high-voltage battery having a supply voltage ranging from 380V to 800V;
the low-voltage power supply is a low-voltage storage battery, and the power supply voltage range of the low-voltage storage battery is 12V-13.5V.
6. A vehicle low-voltage power supply method applied to the vehicle low-voltage power supply system according to any one of claims 1 to 5, the method comprising:
when a series circuit of a high-voltage power supply and a voltage converter supplies power to a low-voltage electric appliance through a low-voltage power supply switch module, the low-voltage power supply supplies power to the low-voltage electric appliance through the low-voltage power supply switch module;
monitoring the electric quantity of the low-voltage power supply;
and if the electric quantity of the low-voltage power supply is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, controlling a change-over switch to be switched on so that the high-voltage power supply charges the low-voltage power supply through the voltage converter.
7. The low-voltage power supply method for vehicles according to claim 6, characterized in that said low-voltage electrical consumers are classified into non-essential-vehicle-type low-voltage electrical consumers and essential-vehicle-type low-voltage electrical consumers, said low-voltage power supply switch module comprises at least two power supply switches, each of said power supply switches being electrically connected to at least one of said low-voltage electrical consumers, said method further comprising:
monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply;
if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the power supply of the non-essential driving low-voltage electric appliances is stopped by controlling the power supply switches corresponding to the non-essential driving low-voltage electric appliances to be switched off.
8. The vehicle low voltage power supply method according to claim 7, wherein said monitoring the charge of said low voltage power source comprises:
monitoring the electric quantity of the low-voltage power supply through the low-voltage power supply control module;
the monitoring of the power supply state of the series circuit of the voltage converter and the high voltage power supply includes:
and monitoring the power supply state of a series circuit of the voltage converter and the high-voltage power supply through a low-voltage power supply control module.
9. The vehicle low-voltage power supply method according to claim 8, wherein if the power of the low-voltage power supply is monitored to be lower than a set power or the low-voltage power supply is fed, the method controls a switch to be closed so that the high-voltage power supply charges the low-voltage power supply through a voltage converter, and comprises the following steps:
if the electric quantity of the low-voltage power supply is monitored to be lower than the set electric quantity or the low-voltage power supply is fed, the low-voltage power supply control module sends a closing instruction to the change-over switch;
and the change-over switch is closed according to the closing instruction, so that the high-voltage power supply charges the low-voltage power supply through the voltage converter.
10. The low-voltage power supply method for vehicles according to claim 8, wherein if a failure is detected in the power supply state of the series circuit of the voltage converter and the high-voltage power supply, the method stops the power supply to the non-essential driving type low-voltage electrical equipment by controlling the power supply switch corresponding to the non-essential driving type low-voltage electrical equipment to be turned off, and comprises the following steps:
if the power supply state of the series circuit of the voltage converter and the high-voltage power supply is monitored to be in fault, the low-voltage power supply control module sends an unnecessary disconnection instruction to the low-voltage power supply switch module;
and the low-voltage power supply switch module controls the power supply switch corresponding to the non-essential driving low-voltage electric appliance to be switched off according to the non-essential driving low-voltage electric appliance disconnection instruction so as to stop supplying power to the non-essential driving low-voltage electric appliance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111093021.9A CN113787912A (en) | 2021-09-17 | 2021-09-17 | Vehicle low-voltage power supply system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111093021.9A CN113787912A (en) | 2021-09-17 | 2021-09-17 | Vehicle low-voltage power supply system and method |
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| CN113787912A true CN113787912A (en) | 2021-12-14 |
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| CN111137231A (en) * | 2018-11-06 | 2020-05-12 | 北京宝沃汽车有限公司 | Power supply system and vehicle |
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| CN111137231A (en) * | 2018-11-06 | 2020-05-12 | 北京宝沃汽车有限公司 | Power supply system and vehicle |
| CN210577827U (en) * | 2019-04-25 | 2020-05-19 | 北京汽车股份有限公司 | Low-voltage battery management system, vehicle battery management system and vehicle |
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