CN114844166A - Vehicle-mounted power supply circuit, control method, device, equipment and medium - Google Patents

Vehicle-mounted power supply circuit, control method, device, equipment and medium Download PDF

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Publication number
CN114844166A
CN114844166A CN202210567860.8A CN202210567860A CN114844166A CN 114844166 A CN114844166 A CN 114844166A CN 202210567860 A CN202210567860 A CN 202210567860A CN 114844166 A CN114844166 A CN 114844166A
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CN
China
Prior art keywords
power supply
vehicle
direct current
relay
current converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210567860.8A
Other languages
Chinese (zh)
Inventor
张恒利
余才光
李岩
段继祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Automobile Research and Development Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Automobile Research and Development Co Ltd
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Publication date
Application filed by Zhejiang Geely Holding Group Co Ltd, Ningbo Geely Automobile Research and Development Co Ltd filed Critical Zhejiang Geely Holding Group Co Ltd
Priority to CN202210567860.8A priority Critical patent/CN114844166A/en
Publication of CN114844166A publication Critical patent/CN114844166A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • 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
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a vehicle power supply circuit, a control method, a device, equipment and a medium, the vehicle power supply circuit comprises a power supply, a circuit protection device, a first direct current converter, the anode of the power supply is connected with the first end of the circuit protection device, the second end of the circuit protection device is connected with the first end of the first direct current converter, the second end of the first direct current converter is connected with the cathode of the power supply, the loop formed in the way can realize the vehicle dormancy state, and power is supplied to the load on the vehicle through the first direct current converter. The scheme replaces a storage battery in the prior art with the power supply, the circuit protection device and the first direct current converter, supplies power to the load in the dormant state, and effectively prolongs the time for supplying power to the load in the dormant state.

Description

Vehicle-mounted power supply circuit, control method, device, equipment and medium
Technical Field
The application relates to the field of new energy automobiles, in particular to a vehicle-mounted power supply circuit, a control method, a device, equipment and a medium.
Background
With the rapid development of technology, the functions of automobiles, such as watching movies, charging mobile phones, etc., are more and more, which are not away from the vehicle-mounted power supply. For new energy vehicles, the vehicle-mounted power supply is generally composed of a storage battery and a high-voltage battery.
In the prior art, a new energy automobile is connected with a Direct Current (DC/DC) converter by a high-voltage battery under a normal operation state, and the DC/DC converter outputs a low-voltage Direct Current to supply power to a low-voltage load of the whole automobile. In the dormant state, the storage battery supplies power for the low-voltage load of the whole vehicle. Along with the intelligent degree of car is higher and higher, low voltage load is also more and more, leads to under the dormancy state, and the battery appears insufficient in electricity.
In summary, the existing vehicle-mounted power supply circuit is powered by the storage battery in a dormant state, so that the storage battery is insufficient in power, the service life of the storage battery is influenced, and the vehicle is started.
Disclosure of Invention
The embodiment of the application provides a vehicle-mounted power supply circuit, a control method, a control device, equipment and a medium, and is used for solving the problems that the service life of a storage battery is influenced and a vehicle is started due to the fact that the storage battery supplies power to the vehicle-mounted power supply circuit in a dormant state.
In a first aspect, an embodiment of the present application provides an on-vehicle power supply circuit, including: the power supply, the circuit protection device and the first direct current converter;
the anode of the power supply is connected with the first end of the circuit protection device, the second end of the circuit protection device is connected with the first end of the first direct current converter, and the second end of the first direct current converter is connected with the cathode of the power supply;
the first direct current converter is used for converting a first voltage value output by the power supply into a second voltage value when a vehicle to which the vehicle-mounted power supply circuit belongs is in a dormant state, and supplying power to a load connected into the first direct current converter based on the second voltage value, wherein the second voltage value is lower than the first voltage value.
In a specific embodiment, the circuit protection device is configured to be connected to an electronic control unit ECU, and the ECU is configured to control the circuit protection device to be disconnected when detecting that a voltage of a battery cell in the power supply is lower than a preset threshold.
In a specific embodiment, the vehicle-mounted power supply circuit further includes: the switching-on assembly comprises a pre-charging assembly and a main positive relay which are connected in parallel, and the pre-charging assembly comprises a pre-charging resistor and a pre-charging relay which are connected in series;
the first end of the switch-on component is connected with the second end of the circuit protection device, the second end of the switch-on component is connected with the first end of the second direct current converter, the second end of the second direct current converter is connected with the first end of the main negative relay, and the second end of the main negative relay is connected with the negative electrode of the power supply;
the second direct current converter is used for converting a first voltage value output by the power supply into a third voltage value when a vehicle to which the vehicle-mounted power supply circuit belongs is in a normal running state, and supplying power to a load connected to the second direct current converter based on the third voltage value, wherein the third voltage value is lower than the first voltage value.
In a specific embodiment, in the vehicle starting state, the main negative relay is in a closed state, the pre-charging relay is in a closed state, and the branch where the pre-charging assembly is located is communicated;
when the voltage at the two ends of the second direct current converter is greater than the preset percentage of the rated voltage of the power supply, the main positive relay is in a closed state, and the branch where the pre-charging assembly is located and the branch where the main positive relay is located are both in a communicated state;
and after the main positive relay is in a closed state, the pre-charging relay is in an off state, and the branch where the main positive relay is located is communicated.
In a specific embodiment, the vehicle-mounted power supply circuit further includes: the standby power supply assembly is connected with the second direct current converter in parallel;
the standby power supply assembly is used for supplying power to a load connected to the second direct current converter when the second direct current converter fails.
In a second aspect, an embodiment of the present application provides a vehicle-mounted power supply control method, which is applied to an ECU (electronic control unit), where the ECU is connected to a vehicle-mounted power supply control circuit, the vehicle-mounted power supply circuit includes a power supply, a circuit protection device and a first dc converter, an anode of the power supply is connected to a first end of the circuit protection device, a second end of the circuit protection device is connected to a first end of the first dc converter, and a second end of the first dc converter is connected to a cathode of the power supply, where the method includes:
detecting the voltage of a battery cell in the power supply;
and when the voltage of the battery cell is determined to be lower than a preset threshold value, controlling the circuit protection device to be disconnected.
In a specific embodiment, the vehicle-mounted power supply circuit further includes: the circuit protection device comprises a switch-on assembly, a second direct current converter and a main negative relay which are connected in series, wherein the switch-on assembly comprises a pre-charging assembly and a main positive relay which are connected in parallel, the pre-charging assembly comprises a pre-charging resistor and a pre-charging relay which are connected in series, a first end of the switch-on assembly is connected with a second end of the circuit protection device, a second end of the switch-on assembly is connected with a first end of the second direct current converter, a second end of the second direct current converter is connected with a first end of the main negative relay, and a second end of the main negative relay is connected with a negative electrode of the power supply;
the method further comprises the following steps:
when the vehicle is detected to be in a normal running state, controlling the main negative relay and the pre-charging relay to be in a closed state;
when the voltage at the two ends of the second direct current converter is detected to be larger than the preset percentage of the rated voltage of the power supply, controlling the main positive relay to be in a closed state;
and after the main positive relay is in a closed state, controlling the pre-charging relay to be in an open state.
In a specific embodiment, the vehicle-mounted power supply circuit further includes: a backup power supply assembly connected in parallel with the second dc converter, the backup power supply assembly comprising: an emergency relay;
the method further comprises the following steps:
when the vehicle is detected to be in a normal running state, controlling an emergency relay in the standby power supply assembly to be in a closed state;
and when the vehicle is detected to be in a dormant state, controlling an emergency relay in the standby power supply assembly to be in an off state.
In a third aspect, an embodiment of the present application provides an on-vehicle power supply control apparatus, which is applied to an on-vehicle electronic unit ECU, where the ECU is connected to an on-vehicle power supply control circuit, the on-vehicle power supply circuit includes a power supply, a circuit protection device, and a first dc converter, and the apparatus includes:
the detection module is used for detecting the voltage of a battery cell in the power supply;
and the control module is used for controlling the circuit protection device to be disconnected when the voltage of the battery cell is determined to be lower than a preset threshold value.
In a fourth aspect, an embodiment of the present application provides a vehicle, including an on-vehicle electronic unit ECU and an on-vehicle power supply circuit;
the vehicle-mounted power supply circuit is the vehicle-mounted power supply circuit of any one of the first aspect;
the ECU is adapted to perform the method of any of the second aspects described above.
In a fifth aspect, the present application provides a readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the vehicle-mounted power supply control method according to any one of the second aspects.
In a sixth aspect, the present application provides a computer program product, which includes a computer program, and the computer program is used for implementing the vehicle-mounted power supply control method according to any one of the second aspects when being executed by a processor.
The vehicle-mounted power supply circuit comprises a power supply, a circuit protection device and a first direct current converter, wherein the positive electrode of the power supply is connected with the first end of the circuit protection device, the second end of the circuit protection device is connected with the first end of the first direct current converter, and the second end of the first direct current converter is connected with the negative electrode of the power supply. The scheme replaces a storage battery in the prior art with the power supply, the circuit protection device and the first direct current converter, supplies power to the load in the dormant state, and effectively prolongs the time for supplying power to the load in the dormant state.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a first embodiment of a vehicle power supply circuit provided in the present application;
fig. 2 is a schematic structural diagram of a second embodiment of a vehicle-mounted power supply circuit provided in the present application;
fig. 3 is a schematic structural diagram of a third embodiment of a vehicle-mounted power supply circuit provided in the present application;
fig. 4 is a schematic flowchart of a first embodiment of a power supply control method for a vehicle-mounted power supply provided by the present application;
fig. 5 is a schematic flowchart of a second embodiment of a power supply control method for a vehicle-mounted power supply provided by the present application;
fig. 6 is a schematic structural diagram of an embodiment of a vehicle-mounted power supply control device provided by the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments that can be made by one skilled in the art based on the embodiments in the present application in light of the present disclosure are within the scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
With the development of science and technology and the improvement of living standard of people, people also put forward higher requirements on the aspects of clothes, eating, housing, etc., and for the aspect of going out, people tend to use new energy automobiles more and more in order to save energy.
The power supply circuit of the vehicle-mounted power supply of the new energy automobile generally comprises a storage battery, a high-voltage battery and a Direct Current (DC/DC) converter. The new energy automobile is connected with the DC/DC converter by the high-voltage battery under the normal running state, and the DC/DC converter outputs low-voltage direct current to supply power for a low-voltage load of the whole automobile. In the dormant state, the storage battery supplies power for the low-voltage load of the whole vehicle. Along with the intelligent degree of car is higher and higher, low pressure load is also more and more, leads to under high pressure after, the battery appears insufficient in electricity.
In order to solve the problems in the prior art, the inventor finds that, in the process of researching a vehicle-mounted power supply circuit, in order to prolong the time of supplying power to a load in a dormant state of a vehicle, a direct current converter can be added, and the direct current converter is used for supplying power to the load. The vehicle-mounted power supply circuit comprises a power supply source, a circuit protection device and a first direct current converter, wherein the positive electrode of the power supply source is connected with the first end of the circuit protection device, the second end of the circuit protection device is connected with the first end of the first direct current converter, the second end of the first direct current converter is connected with the negative electrode of the power supply source, and a loop formed in such a way can supply power for a load on a vehicle through the first direct current converter under the dormant state of the vehicle. In addition, when the battery core in the power supply is lower than the preset threshold value, the circuit protection device is disconnected, and the problem that the power supply appears due to over-discharge of the battery core is prevented. Based on the inventive concept, the vehicle-mounted power supply circuit and the control scheme are designed.
Exemplarily, fig. 1 is a schematic structural diagram of a first embodiment of a vehicle-mounted power supply circuit provided by the present application, and as shown in fig. 1, the vehicle-mounted power supply circuit includes a power supply 101, a circuit protection device 103, and a first dc converter 104, where the circuit protection device 103 may also be referred to as a first circuit protection device;
the positive electrode of the power supply 101 is connected with the first end of the circuit protection device 103, the second end of the circuit protection device 103 is connected with the first end of the first direct current converter 104, and the second end of the first direct current converter 104 is connected with the negative electrode of the power supply 101;
the first dc converter 104 is configured to convert a first voltage value output by the power supply 104 into a second voltage value when a vehicle to which the vehicle-mounted power supply circuit belongs is in a sleep state, and supply power to a load connected to the first dc converter 104 based on the second voltage value, where the second voltage value is lower than the first voltage value.
It should be noted that the internal structure of the first dc converter 104 is not limited in the embodiments of the present application, and may be selected according to actual situations.
According to the vehicle-mounted power supply circuit provided by the embodiment of the application, the power supply for the load of the vehicle in the dormant state can be realized through the loop formed by the power supply 101, the circuit protection device 103 and the first direct current converter 104, and compared with the prior art that the storage battery is used for supplying power for the load, the power supply time is prolonged.
In an embodiment of the present application, the circuit protection device 103 is configured to be connected to an Electronic Control Unit (ECU), and the ECU is configured to Control the circuit protection device 103 to be disconnected when detecting that a voltage of a battery cell in the power supply 101 is lower than a preset threshold.
Optionally, as shown in fig. 1, the vehicle-mounted power supply circuit may further include a second circuit protection device 102, a first end of the second circuit protection device 102 is connected to the positive electrode of the power supply 101, and a first end of a first circuit protection device 103 of the second circuit protection device 102 is connected to the positive electrode. The second circuit protection device 102 is configured to be connected to an ECU, and the ECU is configured to control the second circuit protection device 102 to be disconnected when a collision of the vehicle is detected.
The vehicle-mounted power supply circuit provided by the embodiment of the application effectively reduces the over-discharge risk of the power supply 101, reduces the vehicle operation risk and improves the vehicle operation safety by arranging the first circuit protection device 103 and the second circuit protection device 102.
Exemplarily, on the basis of the embodiment shown in fig. 1, fig. 2 is a schematic structural diagram of a second embodiment of the vehicle-mounted power supply circuit provided in this application, and as shown in fig. 2, the vehicle-mounted power supply circuit further includes: the system comprises a switch-on assembly 200, a second direct current converter 108 and a main negative relay 109 which are connected in series, wherein the switch-on assembly 200 comprises a pre-charging assembly 201 and a main positive relay 107 which are connected in parallel, and the pre-charging assembly 201 comprises a pre-charging resistor 105 and a pre-charging relay 106 which are connected in series;
a first end of the connection component 200 is connected with a second end of the circuit protection device 103, a second end of the connection component 200 is connected with a first end of a second direct current converter 108, a second end of the second direct current converter 108 is connected with a first end of a main negative relay 109, and a second end of the main negative relay 109 is connected with a negative electrode of the power supply 101;
the second dc converter 108 is configured to, when a vehicle to which the vehicle-mounted power supply circuit belongs is in a normal operation state, convert the first voltage value output by the power supply 101 into a third voltage value, and supply power to a load connected to the second dc converter 108 based on the third voltage value, where the third voltage value is lower than the first voltage value.
When the vehicle is in a starting state, the main negative relay 109 is in a closed state, the pre-charging relay 106 is in a closed state, and the branch where the pre-charging assembly 201 is located is communicated;
when the voltage at the two ends of the second direct current converter 108 is greater than the preset percentage of the rated voltage of the power supply 101, the main positive relay 107 is in a closed state, and the branch where the pre-charging assembly 201 is located and the branch where the main positive relay 107 is located are both in a communicated state;
after the main positive relay 107 is in the closed state, the pre-charge relay 106 is in the open state, and the branch where the main positive relay 107 is located is connected.
In the embodiment of the present application, the internal structure of the second dc converter 108 is not limited, and may be selected according to actual situations.
When the vehicle is in the sleep state, the pre-charge relay 106, the main positive relay 107, and the main negative relay 109 are in the off state.
According to the vehicle-mounted power supply circuit provided by the embodiment of the application, when a vehicle is in a normal running state, the vehicle-mounted power supply circuit supplies power to a load in the vehicle through a loop formed by the power supply 101, the switch-on component 200, the second direct current converter 108 and the main negative relay 109 and a loop formed by the power supply 101, the circuit protection device 103 and the first direct current converter 104, so that double-loop power supply is realized. In addition, the electrical components in the vehicle can be effectively protected by first closing the pre-charge relay 106, closing the main positive relay 107 when the voltage across the second dc converter 108 is greater than a preset percentage of the rated voltage of the power supply 101, and then opening the pre-charge relay 106.
Exemplarily, on the basis of the embodiment shown in fig. 2, fig. 3 is a schematic structural diagram of a third embodiment of the vehicle-mounted power supply circuit provided by the present application, and as shown in fig. 3, the vehicle-mounted power supply circuit further includes: a backup power supply unit 110 connected in parallel to the second dc converter 108;
the backup power supply assembly 110 is used to supply power to a load connected to the second dc converter 108 when the second dc converter 108 fails.
Illustratively, as shown in fig. 3, the backup power supply assembly 110 includes a first diode 111, an emergency relay 113, a transistor 114, a second diode 115, and a third diode 116.
It should be noted that the emergency relay 113 may be the same type of relay as the precharge relay 106, the main positive relay 107, and the main negative relay 109, or may be a different type of relay. The ECU may control the switching of the emergency relay 113, which is only a name corresponding to the emergency relay 113 and is not limited thereto, and the name of the emergency relay 113 may also be a first relay, a second relay, and the like.
The cathode of the first diode 111 is connected to the first end of the emergency relay 113, the second end of the emergency relay 113 is connected to the collector of the triode 114, the emitter of the triode 114 is connected to the cathode of the third diode 116, the anodes of the third diode 116 are respectively connected to the third end of the second dc converter 108 and the base of the triode 114, and the fourth end of the second dc converter 108 is connected to the anode of the second diode 115.
The anode of the third diode 116 and the fourth terminal of the second dc converter 108 are connected to the load. The anode of the first diode 111 is connected to the anode of at least one cell in the power supply 101, and the cathode of the second diode 115 is connected to the cathode of at least one cell in the power supply 101. The number of at least one battery cell may be determined according to the rated voltage of the battery cell, as long as the output voltage of the power supply formed by the number of battery cells can reach the voltage required by the load. The number of at least one battery cell is not limited, and the battery cell can be set according to actual conditions.
It should be noted that, when the vehicle is in the normal running state, the emergency relay 113 is in the closed state. When the vehicle is in the sleep state, the emergency relay 113 is in the off state.
Optionally, in another possible implementation of this embodiment, the backup power supply assembly 110 may also be implemented by a storage battery. Specifically, the anode of the first diode 111 may be connected to the anode of the battery, and the cathode of the second diode 115 may be connected to the cathode of the battery.
Optionally, the standby power supply assembly 110 further includes a third circuit protection device 112, a first terminal of the third protection device 112 is connected to the cathode of the first transistor 111, and a second terminal of the third protection device 112 is connected to the first terminal of the emergency relay 113. When the standby power supply assembly works, and the vehicle is in a dormant state after flameout, and when the fault of the emergency relay 113 is detected, the third circuit protection device 112 is controlled to be disconnected, so that the over-discharge of the battery core or the storage battery in the power supply 101 is prevented.
Optionally, the transistor 114 of the standby power supply 110 may be replaced by a MOS transistor.
According to the vehicle-mounted power supply circuit provided by the embodiment of the application, through the standby power supply assembly 110, when the second direct current converter 108 fails, power is supplied to a load connected to the second direct current converter 108, and vehicle safety is effectively guaranteed.
The following provides an embodiment of a power supply control method for a vehicle-mounted power supply. For details that are not disclosed in the embodiments of the vehicle power supply control method of the present application, please refer to the embodiments of the vehicle power supply circuit described above in the present application. It should be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 4 is a schematic flowchart of a first embodiment of a vehicle-mounted power supply control method provided by the present application, where the vehicle-mounted power supply control method is applied to an ECU, the ECU is connected to a vehicle-mounted power supply control circuit, and the vehicle-mounted power supply control circuit is the vehicle-mounted power supply control circuit described in any one of the embodiments of fig. 1 to fig. 3. Optionally, the vehicle-mounted power supply control method includes the following steps:
s401: and detecting the voltage of a battery cell in the power supply.
When the vehicle is in a sleep state, the load connected to the first dc converter 104 is powered by the loop formed by the power supply 101, the circuit protection device 103 and the first dc converter 104.
In this step, in order to prevent the power supply 104 from being over-discharged in the vehicle in the sleep state, a power management system in the vehicle may detect the voltage of the battery in the power supply 104, and the ECU may obtain the battery in the power supply 104 through the power management system.
S402: and when the voltage of the battery cell is determined to be lower than the preset threshold value, the circuit protection device is controlled to be disconnected.
In this step, after detecting and detecting the voltage of the battery cell in the power supply 104, the ECU controls the circuit protection device 103 to turn off when determining that the voltage of the battery cell is lower than the preset threshold value, in order to avoid the power supply 104 from being over-discharged.
It should be noted that the preset threshold is set by a worker before the vehicle leaves the factory, and is used to determine under what conditions the circuit protection device 103 is turned off. The preset threshold may be 2.4V, 2.6V, or 3V. The preset threshold value is not specifically limited, and can be set according to actual conditions.
According to the vehicle-mounted power supply control method provided by the embodiment, when the voltage of the battery cell in the power supply 101 is detected to be lower than the preset threshold, the circuit protection device 103 is switched off, so that the over-discharge risk of the power supply 101 is effectively reduced.
Fig. 5 is a schematic flowchart of a second embodiment of a power supply control method of a vehicle-mounted power supply provided in the present application, where the power supply circuit of the vehicle-mounted power supply further includes: the on-board power supply control method specifically comprises the following steps of connecting a switch-on assembly 200, a second direct-current converter 108 and a main negative relay 109 in series, wherein the switch-on assembly 200 comprises a pre-charging assembly 201 and a main positive relay 107 which are connected in parallel, the pre-charging assembly 201 comprises a pre-charging resistor 105 and a pre-charging relay 106 which are connected in series, a first end of the switch-on assembly 200 is connected with a second end of a circuit protection device 103, a second end of the switch-on assembly 200 is connected with a first end of the second direct-current converter 108, a second end of the second direct-current converter 108 is connected with a first end of the main negative relay 109, and a second end of the main negative relay 109 is connected with a negative pole of a power supply 101, as shown in fig. 5:
s501: and when the vehicle is detected to be in a normal running state, controlling the main negative relay and the pre-charging relay to be in a closed state.
In this step, the ECU detects that the vehicle is in a normal running state, i.e., the vehicle goes from a sleep state to a normal running state, in which all loads on the vehicle need to be supplied with power, and the vehicle-mounted power supply circuit is communicated with the vehicle drive motor. The general vehicle-mounted power supply circuit needs to be connected with electrical components such as a vehicle driving motor and a capacitor, if the general vehicle-mounted power supply circuit is directly connected with the electrical components, voltage values at two ends of the electrical components are instantly increased, and damage is easily caused, so that the main and negative relays 109 and the pre-charging relay 106 need to be controlled to be in a closed state.
It should be noted that the normal operation state includes a vehicle start and stop state and a vehicle running state.
S502: and when the voltage at the two ends of the second direct current converter is detected to be greater than the preset percentage of the rated voltage of the power supply, controlling the main positive relay to be in a closed state.
In this step, when the ECU detects that the voltage across the second dc converter 108 is greater than the preset percentage of the rated voltage of the power supply 101, since the electrical component is in a parallel state with the second dc converter 108, and therefore the voltage across the electrical component is also greater than the preset percentage of the rated voltage of the power supply 101, it indicates that the voltage across the electrical component is slowly increased, and the main positive relay 107 may be closed, so as to control the pre-charge relay 106 and the main positive relay 107 to be in a closed state.
It should be noted that the preset percentage is set by a worker before the vehicle leaves the factory, and is used for determining when to close the main positive relay 107. The preset percentage may be 95%, 97%, or 99%. The preset percentage is not specifically limited in the embodiment of the application, and the setting can be carried out according to the actual situation.
S503: and after the main positive relay is in a closed state, controlling the pre-charging relay to be in an open state.
In this step, after the ECU controls the main positive relay 107 to be closed, the pre-charge relay 106 is controlled to be opened, and the vehicle runs normally. At this time, the first dc converter 104 and the second dc converter 108 supply power to the load on the vehicle, so that the normal operation of the vehicle is ensured, and the operation risk is reduced.
It should be noted that the loads connected to the first dc converter 104 and the second dc converter 108 may be completely the same or partially the same. The embodiments of the present application do not limit the number of loads connected to the first dc converter 104 and the second dc converter 108, and the number of loads may be set according to actual situations.
When the vehicle goes from the normal running state to the sleep state, the ECU controls the pre-charge relay 106, the main positive relay 107 and the main negative relay 109 to be turned off, and the power supply 101, the circuit protection device 103 and the first dc converter 104 form a circuit to supply power to the load on the vehicle.
In the power supply control method for the vehicle-mounted power supply provided by the embodiment, when the vehicle is in a normal running state, the pre-charge relay 106 is firstly closed, when the voltage across the second direct current converter 108 reaches a preset percentage of the rated voltage of the power supply 101, the main positive relay 107 is closed, and then the pre-charge relay 106 is opened. The double-loop power supply system can realize double-loop power supply for loads on the vehicle, reduce the risk of damage of electrical components on the vehicle and improve the safety of the vehicle.
The following is a description of a standby circuit portion in a vehicle-mounted power supply circuit provided in an embodiment of the present application and a control method thereof.
The vehicle-mounted power supply circuit further comprises: a backup power supply assembly 110 connected in parallel with the second dc converter 108, the backup power supply assembly comprising: an emergency relay 113. When detecting that the vehicle is in a normal running state, the ECU controls an emergency relay 113 in the standby power supply assembly 110 to be in a closed state; the ECU controls the emergency relay 113 in the backup power supply assembly 110 to be in an off state when detecting that the vehicle is in the sleep state.
For example, as shown in fig. 1, when the ECU detects that the vehicle is in a normal operation state, the ECU controls the emergency relay 113 to close, and if the second dc converter 108 operates normally, since the third terminal of the second dc converter 108 is connected to the base of the transistor 114, when the base of the transistor 114 has a voltage, the emitter and the collector of the transistor 114 are disconnected, and power is not supplied to the load. If the second dc converter 108 fails, the base of the triode 114 has no voltage, so that the emitter and the collector of the triode 114 are connected to supply power to the load, and meanwhile, due to the existence of the third diode 116, in the process of the second dc converter 108 failing, the base of the triode 114 does not have voltage, the emitter and the collector of the triode 114 are connected, and the load is not powered off.
When detecting that the vehicle is in a dormant state, the ECU controls the emergency relay 113 to be switched off, and at the moment, because the pre-charging relay 106, the main positive relay 107 and the main negative relay 109 are also in an off state, a loop formed by the power supply 101, the circuit protection device 103 and the first direct current converter 104 supplies power to a load on the vehicle.
According to the power supply control method for the vehicle-mounted power supply, when the vehicle is in a normal running state, the emergency relay of the standby power supply assembly 110 is controlled to be in a closed state, and in the case of a fault of the second direct current converter 108, the standby power supply assembly 110 can be automatically triggered to supply power to the load. When the vehicle is in the sleep state, the emergency relay in the backup power supply assembly 110 is controlled to be in the off state, and power supply to the load cannot be triggered due to the power failure of the second dc converter 108. Effectively improving the running safety of the vehicle.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
FIG. 6 is a schematic structural diagram of an embodiment of a vehicle power supply control device provided in the present application; this vehicle mounted power supply controlling means is applied to ECU, and ECU is connected with vehicle mounted power supply control circuit, and vehicle mounted power supply circuit includes power supply, circuit protection device and first dc converter, as shown in fig. 6, this vehicle mounted power supply controlling means 60 includes:
the detection module 61 is configured to detect a voltage of a battery cell in the power supply;
and the control module 62 is configured to control the circuit protection device to be turned off when it is determined that the voltage of the battery cell is lower than a preset threshold.
Further, the vehicle-mounted power supply circuit further comprises: the switch-on subassembly, second direct current converter and the main negative relay of series connection, the switch-on subassembly includes parallelly connected pre-charge subassembly and main positive relay, the pre-charge subassembly includes series connection's pre-charge resistance and pre-charge relay, the first end of switch-on subassembly is held with the second of circuit protection device and is connected, the second end of switch-on subassembly is connected with the first end of second direct current converter, the second end of second direct current converter is connected with the first end of main negative relay, the second end of main negative relay is connected with power supply's negative pole. The control module 62 is further configured to:
when the detection module 61 detects that the vehicle is in a normal running state, the main negative relay and the pre-charging relay are controlled to be in a closed state;
when the detection module 61 detects that the voltage at the two ends of the second direct current converter is greater than the preset percentage of the rated voltage of the power supply, the main positive relay is controlled to be in a closed state;
and after the main positive relay is in a closed state, controlling the pre-charging relay to be in an open state.
Further, the vehicle-mounted power supply circuit further comprises a standby power supply assembly connected with the second direct current converter in parallel, and the standby power supply assembly comprises: an emergency relay. The control module 62 is further configured to:
when the detection module 61 detects that the vehicle is in a normal running state, controlling an emergency relay in the standby power supply assembly to be in a closed state;
when the detection module 61 detects that the vehicle is in a dormant state, an emergency relay in the standby power supply assembly is controlled to be in an off state.
The vehicle-mounted power supply control device provided by the embodiment is used for executing the technical scheme in any one of the method embodiments, and the implementation principle and the technical effect are similar, and are not described herein again.
The embodiment of the application also provides a vehicle, which comprises an ECU and a vehicle-mounted power supply circuit;
the vehicle-mounted power supply circuit is the vehicle-mounted power supply circuit in the structural embodiment of the vehicle-mounted power supply circuit;
the ECU is used for executing the method of the method embodiment.
The ECU in the vehicle provided in this embodiment is configured to execute the technical solutions in any of the foregoing method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
The embodiment of the present application further provides a readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the technical solutions provided by any of the foregoing method embodiments.
The embodiment of the present application further provides a computer program product, which includes a computer program, and the computer program is used for implementing the technical solution provided by any of the foregoing method embodiments when being executed by a processor.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (12)

1. An on-board power supply circuit, comprising: the power supply, the circuit protection device and the first direct current converter;
the anode of the power supply is connected with the first end of the circuit protection device, the second end of the circuit protection device is connected with the first end of the first direct current converter, and the second end of the first direct current converter is connected with the cathode of the power supply;
the first direct current converter is used for converting a first voltage value output by the power supply into a second voltage value when a vehicle to which the vehicle-mounted power supply circuit belongs is in a dormant state, and supplying power to a load connected into the first direct current converter based on the second voltage value, wherein the second voltage value is lower than the first voltage value.
2. The vehicle-mounted power supply circuit according to claim 1, wherein the circuit protection device is configured to be connected to an Electronic Control Unit (ECU), and the ECU is configured to control the circuit protection device to be disconnected when detecting that a voltage of a battery cell in the power supply is lower than a preset threshold value.
3. The vehicular power supply circuit according to claim 2, further comprising: the switch-on assembly comprises a pre-charging assembly and a main positive relay which are connected in parallel, and the pre-charging assembly comprises a pre-charging resistor and a pre-charging relay which are connected in series;
the first end of the switch-on component is connected with the second end of the circuit protection device, the second end of the switch-on component is connected with the first end of the second direct current converter, the second end of the second direct current converter is connected with the first end of the main negative relay, and the second end of the main negative relay is connected with the negative electrode of the power supply;
the second direct current converter is used for converting a first voltage value output by the power supply into a third voltage value when a vehicle to which the vehicle-mounted power supply circuit belongs is in a normal running state, and supplying power to a load connected to the second direct current converter based on the third voltage value, wherein the third voltage value is lower than the first voltage value.
4. The vehicle-mounted power supply circuit according to claim 3, wherein in the vehicle starting state, the main negative relay is in a closed state, the pre-charging relay is in a closed state, and the branch where the pre-charging component is located is communicated;
when the voltage at the two ends of the second direct current converter is greater than the preset percentage of the rated voltage of the power supply, the main positive relay is in a closed state, and the branch where the pre-charging assembly is located and the branch where the main positive relay is located are both in a communicated state;
and after the main positive relay is in a closed state, the pre-charging relay is in an off state, and the branch where the main positive relay is located is communicated.
5. The vehicular power supply circuit according to claim 3 or 4, further comprising: the standby power supply assembly is connected with the second direct current converter in parallel;
the standby power supply assembly is used for supplying power to a load connected to the second direct current converter when the second direct current converter fails.
6. A power supply control method of a vehicle-mounted power supply is applied to an ECU (electronic control unit) of a vehicle-mounted electronic unit, the ECU is connected with a control circuit of the vehicle-mounted power supply, the power supply circuit of the vehicle-mounted power supply comprises a power supply, a circuit protection device and a first direct current converter, the anode of the power supply is connected with the first end of the circuit protection device, the second end of the circuit protection device is connected with the first end of the first direct current converter, and the second end of the first direct current converter is connected with the cathode of the power supply, and the method comprises the following steps:
detecting the voltage of a battery cell in the power supply;
and when the voltage of the battery cell is determined to be lower than a preset threshold value, controlling the circuit protection device to be disconnected.
7. The method of claim 6, wherein the onboard power supply circuit further comprises: the circuit protection device comprises a switch-on assembly, a second direct current converter and a main negative relay which are connected in series, wherein the switch-on assembly comprises a pre-charging assembly and a main positive relay which are connected in parallel, the pre-charging assembly comprises a pre-charging resistor and a pre-charging relay which are connected in series, a first end of the switch-on assembly is connected with a second end of the circuit protection device, a second end of the switch-on assembly is connected with a first end of the second direct current converter, a second end of the second direct current converter is connected with a first end of the main negative relay, and a second end of the main negative relay is connected with a negative electrode of the power supply;
the method further comprises the following steps:
when the vehicle is detected to be in a normal running state, controlling the main negative relay and the pre-charging relay to be in a closed state;
when the voltage at the two ends of the second direct current converter is detected to be larger than the preset percentage of the rated voltage of the power supply, controlling the main positive relay to be in a closed state;
and after the main positive relay is in a closed state, controlling the pre-charging relay to be in an open state.
8. The method of claim 7, wherein the onboard power supply circuit further comprises: a backup power supply assembly connected in parallel with the second dc converter, the backup power supply assembly comprising: an emergency relay;
the method further comprises the following steps:
when the vehicle is detected to be in a normal running state, controlling an emergency relay in the standby power supply assembly to be in a closed state;
and when the vehicle is detected to be in a dormant state, controlling an emergency relay in the standby power supply assembly to be in an off state.
9. The utility model provides a vehicle mounted power supply controlling means, is applied to on-vehicle electronic unit ECU, ECU and vehicle mounted power supply control circuit are connected, vehicle mounted power supply circuit includes power supply, circuit protection device and first DC converter, its characterized in that, the device includes:
the detection module is used for detecting the voltage of a battery cell in the power supply;
and the control module is used for controlling the circuit protection device to be disconnected when the voltage of the battery cell is determined to be lower than a preset threshold value.
10. A vehicle is characterized by comprising an on-vehicle electronic unit (ECU) and an on-vehicle power supply circuit;
the vehicle-mounted power supply circuit is the vehicle-mounted power supply circuit of any one of the claims 1 to 5;
the ECU is adapted to perform the method of any one of the preceding claims 6 to 8.
11. A readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the in-vehicle power supply control method according to any one of claims 6 to 8.
12. A computer program product comprising a computer program which, when executed by a processor, is adapted to implement the in-vehicle power supply control method of any one of claims 6 to 8.
CN202210567860.8A 2022-05-24 2022-05-24 Vehicle-mounted power supply circuit, control method, device, equipment and medium Pending CN114844166A (en)

Priority Applications (1)

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CN202210567860.8A CN114844166A (en) 2022-05-24 2022-05-24 Vehicle-mounted power supply circuit, control method, device, equipment and medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210567860.8A CN114844166A (en) 2022-05-24 2022-05-24 Vehicle-mounted power supply circuit, control method, device, equipment and medium

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CN114844166A true CN114844166A (en) 2022-08-02

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