CN107134824B - Automatic recognition protection method for vehicle power supply - Google Patents

Automatic recognition protection method for vehicle power supply Download PDF

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Publication number
CN107134824B
CN107134824B CN201710298077.5A CN201710298077A CN107134824B CN 107134824 B CN107134824 B CN 107134824B CN 201710298077 A CN201710298077 A CN 201710298077A CN 107134824 B CN107134824 B CN 107134824B
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voltage
output
microprocessor
power supply
voltage detection
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CN107134824A (en
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李武斌
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Huizhou Foryou General Electronics Co Ltd
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Huizhou Foryou General Electronics Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention discloses a vehicle power supply automatic identification protection method, which comprises the following steps: constructing a voltage division detection circuit for a vehicle power supply; the voltage division detection circuit comprises a low-voltage sampling circuit, a high-voltage sampling circuit, a microprocessor and a power supply output circuit; the low-voltage sampling circuit divides and samples the vehicle power supply and outputs a sampling result to the microprocessor through the low-voltage detection end; the high-voltage sampling circuit divides and samples the vehicle power supply and outputs a sampling result to the microprocessor through the high-voltage detection end; and the microprocessor outputs corresponding control signals to manage and control the output voltage of the power output circuit according to the output values and the duration time of the low-voltage detection end and the high-voltage detection end. The invention automatically identifies the current vehicle power state, realizes the adaptation and management of a power supply system within a certain voltage drop range, and prevents the device damage caused by the continuous discharge of the vehicle power.

Description

Automatic recognition protection method for vehicle power supply
Technical Field
The invention relates to the technical field of automobile power supplies, in particular to an automatic identification and protection method for a vehicle power supply.
Background
Along with the integration level of the vehicle-mounted equipment is higher and higher, the power consumption is higher and higher, and the consumption of the electric quantity of the storage battery is higher and higher. At present, a vehicle power supply mainly comprises two power supply systems, namely a 12V power supply system and a 24V power supply system. And part of vehicle-mounted equipment is powered by a storage battery after the vehicle is shut down, such as a navigation vehicle-mounted system, a sound system and the like. When the vehicle is not used for a long time, the storage battery is discharged continuously, and if the power supply identification protection circuit is not arranged, the storage battery is over-discharged, so that the vehicle can not be ignited or the storage battery is damaged and is scrapped. Moreover, more and more OEM (Original Equipment Manufacturer) car factories use the start-stop function at present, but the prior art does not adapt and manage the vehicle power supply system and is compatible with the car start-stop function.
Disclosure of Invention
The invention aims to solve the technical problem of providing a universal vehicle power supply automatic identification protection method, which automatically identifies the current vehicle power supply state, realizes the adaptation and management of a power supply system within a certain voltage drop range and prevents the device damage caused by the continuous discharge of the vehicle power supply.
In order to solve the above technical problems, an embodiment of the present invention provides a vehicle power supply automatic identification protection method, including:
constructing a voltage division detection circuit for a vehicle power supply; the voltage division detection circuit comprises a low-voltage sampling circuit, a high-voltage sampling circuit, a microprocessor and a power supply output circuit;
the low-voltage sampling circuit divides and samples the vehicle power supply and outputs a sampling result to the microprocessor through the low-voltage detection end; the high-voltage sampling circuit divides and samples the vehicle power supply and outputs a sampling result to the microprocessor through the high-voltage detection end;
and the microprocessor outputs corresponding control signals to manage and control the output voltage of the power output circuit according to the output values and the duration time of the low-voltage detection end and the high-voltage detection end.
In an implementation manner, the microprocessor outputs corresponding control signals to manage and control the output voltage of the power output circuit according to the output values of the low voltage detection terminal and the high voltage detection terminal and the duration time thereof, and includes:
after the voltage division detection circuit is powered on and lasts for preset initialization time, the microprocessor detects output values of the low-voltage detection end and the high-voltage detection end; comparing the output values of the low-voltage detection end and the high-voltage detection end with a set first voltage minimum value, a set first voltage maximum value, a set second voltage minimum value and a set second voltage maximum value respectively; and the microprocessor switches the working state of the power supply according to the comparison result and controls the power-on or power-off operation of the power supply output circuit.
Optionally, the microprocessor switches the power supply operating state according to the comparison result, and controls a power-on or power-off operation of the power supply output circuit, including:
when the output value of the low-voltage detection end and the output value of the high-voltage detection end are both smaller than the first voltage minimum value, the microprocessor executes low-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine;
when the output value of the low-voltage detection end is greater than the first voltage minimum value and the output value of the high-voltage detection end is smaller than the first voltage maximum value, the microprocessor enters a first power supply management state and controls the power supply output circuit to be normally started;
when the output value of the low-voltage detection end is larger than the first voltage maximum value and the output value of the high-voltage detection end is smaller than the second voltage minimum value, the microprocessor executes abnormal voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine;
when the output value of the low-voltage detection end is greater than the second voltage minimum value and the output value of the high-voltage detection end is smaller than the second voltage maximum value, the microprocessor enters a second power supply management state and controls the power supply output circuit to be normally started;
and when the output value of the low-voltage detection end and the output value of the high-voltage detection end are both greater than the second voltage maximum value, the microprocessor executes high-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
Further, after the microprocessor enters the first power management state, when the output value of the high voltage detection terminal is smaller than the first voltage minimum value, the method further includes:
if the microprocessor detects that the output value of the current low-voltage detection end is greater than or equal to 6V and the duration time is less than the preset starting time, starting a 6V voltage starting and stopping function by the microprocessor;
and if the microprocessor detects that the current output value of the low-voltage detection end is less than 6V and the duration time is longer than the preset starting time, the microprocessor executes low-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
Further, after the microprocessor enters the first power management state, when the output value of the high voltage detection terminal is greater than the first voltage maximum value, the method further includes:
and the microprocessor executes high-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
Further, after the microprocessor enters a second power management state, when the output value of the high voltage detection terminal is smaller than the second voltage minimum value, the method further includes:
if the microprocessor detects that the output value of the current low-voltage detection end is greater than or equal to 8V and the duration time is less than the preset starting time, starting the 8V voltage starting and stopping function by the microprocessor;
and if the microprocessor detects that the current output value of the low-voltage detection end is greater than 8V and the duration time is greater than the preset starting time, the microprocessor executes low-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
Further, after the microprocessor enters a second power management state, when the output value of the high voltage detection terminal is greater than the second voltage maximum value, the method further includes:
and the microprocessor executes high-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
The vehicle power supply automatic identification protection method provided by the embodiment of the invention is characterized in that a voltage division detection circuit is constructed for a vehicle power supply, the vehicle power supply is subjected to voltage division, sampling, comparison and analysis through a low-voltage sampling circuit, a high-voltage sampling circuit and a microprocessor in the vehicle power supply, and a corresponding control signal is output according to the running state of a vehicle to perform adaptive control on the output voltage of a power supply output circuit. On one hand, the invention realizes the identification adaptation, high voltage protection and low voltage protection of a 12V power supply system and is compatible with the starting and stopping functions of 6V of the automobile; on the other hand, the invention realizes the identification adaptation, high voltage protection and low voltage protection of a 24V power supply system and is compatible with the 8V starting and stopping function of the automobile; and the protection of abnormal voltage between two power management systems of the vehicle is realized. The technical scheme provided by the invention has the advantages of low circuit construction cost, easiness in realization, high automation degree and high practicability.
Drawings
FIG. 1 is a flowchart illustrating steps of an embodiment of a method for automatic identification and protection of a vehicle power supply provided by the present invention.
Fig. 2 is a circuit schematic diagram of one embodiment of a vehicle power supply automatic identification protection circuit constructed in accordance with the present invention.
Fig. 3 is a circuit schematic diagram of yet another embodiment of a vehicle power supply automatic identification protection circuit constructed in accordance with the present invention.
FIG. 4 is a flowchart illustrating the steps of an embodiment of the present invention for managing and controlling the output voltage of a microprocessor.
FIG. 5 is a flowchart illustrating steps of a specific implementation of the present invention for managing and controlling output voltage by a microprocessor.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1, a flowchart of steps of an embodiment of a method for automatic identification and protection of a vehicle power supply provided by the present invention is shown.
In this embodiment, the method for automatically identifying and protecting a vehicle power supply mainly includes the following steps:
step S1: and constructing a voltage division detection circuit for the vehicle power supply. The voltage division detection circuit includes a low voltage sampling circuit 100, a high voltage sampling circuit 200, a Microprocessor (MCU)300, and a power output circuit 400.
Fig. 2 is a schematic circuit diagram of an embodiment of the automatic identification protection circuit for a vehicle power supply according to the invention. In specific implementation, a series circuit of the resistor R1 and the resistor R2 forms a low-voltage sampling circuit 100, and is connected with the microprocessor 300 through a low-voltage detection end AD 1; the series circuit of the resistor R3 and the resistor R4 forms a high-voltage sampling circuit 200; is connected with the microprocessor 300 through a high voltage detection end AD 2. In specific implementation, the highest voltage divided by the connection point of the resistor R1 and the resistor R2 cannot exceed the maximum voltage borne by the microprocessor 300, generally, 85% of the maximum value is selected for derating, and the current is required to meet the current consumption of the port of the microprocessor 300; similarly, the highest voltage expressed by the values of the resistors R3 and R4 cannot exceed the maximum voltage borne by the microprocessor 300, and the maximum voltage is generally reduced by 85% of the maximum value, so that the current is required to meet the current consumption of the port of the microprocessor 300; preferably, the precision of each resistor is 1%. In the present embodiment, the port AD1 is connected with the series node of the resistor R1 and the resistor R2 for realizing low voltage detection of the vehicle battery; the port AD2 is connected with the series node of the resistor R3 and the resistor R4 and is used for realizing high-voltage detection of the vehicle storage battery. In an implementation, the resistors R1 and R3 each have a value of 100K Ω, and the resistors R2 and R4 each have a value of 10K Ω.
In order to realize the overvoltage protection of the low-voltage sampling circuit 100 and the high-voltage sampling circuit 200 to the microprocessor 300 and filter the voltage noise, an overvoltage protection circuit and a filter circuit are further arranged in the voltage division detection circuit.
Referring to fig. 3, a schematic circuit diagram of another embodiment of the automatic identification protection circuit for the vehicle power supply constructed according to the present invention is shown. A voltage stabilizing diode Z1 and a capacitor C1 are connected in parallel between the low-voltage detection end AD1 and the grounding end, the voltage stabilizing diode Z1 and a resistor R1 form an overvoltage protection circuit, and the capacitor C1 and a resistor R1 form an RC filter circuit; similarly, a zener diode Z2 and a capacitor C2 are connected in parallel between the high voltage detection terminal AD2 and the ground terminal, the zener diode Z2 and a resistor R3 form an overvoltage protection circuit, and the capacitor C2 and a resistor R3 form an RC filter circuit.
In specific implementation, the microprocessor 300 controls the on/off of the power output circuit 400 to protect the on/off of the whole device by acquiring the states of the low voltage detection end AD1 and the high voltage detection end AD 2.
Step S2: the low voltage sampling circuit 100 divides and samples the vehicle power supply, and outputs a sampling result to the microprocessor 300 through a low voltage detection terminal AD 1; the high-voltage sampling circuit 200 divides and samples the vehicle power supply, and outputs the sampling result of the AD2 to the microprocessor 300 through a high-voltage detection terminal;
step S3: the microprocessor 300 outputs corresponding control signals to manage and control the output voltage of the power output circuit 400 according to the output values and the durations of the low voltage detection terminal AD1 and the high voltage detection terminal AD 2.
Referring to FIG. 4, a flowchart illustrating steps of an embodiment of the microprocessor for managing and controlling the output voltage according to the present invention is shown. Specifically, the step S3 includes:
step S301: after the voltage division detection circuit is powered on and lasts for a preset initialization time (for example, for more than 2 seconds), the microprocessor 300 detects the output values of the low voltage detection terminal AD1 and the high voltage detection terminal AD 2;
step S302: comparing the output values of the low voltage detection end AD1 and the high voltage detection end AD2 with a first voltage minimum value, a first voltage maximum value, a second voltage minimum value and a second voltage maximum value which are set respectively;
step S303: the microprocessor 300 switches the power state according to the comparison result and controls the power-on or power-off operation of the power output circuit 400.
Referring to fig. 5, a flowchart of the steps of one embodiment of the present invention for managing and controlling the output voltage by the microprocessor is shown.
Specifically, the first voltage minimum value is preferably 10.8V, the first voltage maximum value is preferably 16V, the second minimum value is preferably 18V, and the second maximum value is preferably 32V. The present embodiment describes the control principle of the microprocessor 300 with this as a preset value. In the present invention, the first voltage minimum value, the first voltage maximum value, the second voltage minimum value and the second voltage maximum value include, but are not limited to, the above-mentioned set values.
In this embodiment, the step S303 of switching the power supply operating state according to the comparison result includes:
(1) when the output value of the low voltage detection terminal AD1 and the output value of the high voltage detection terminal AD2 are both less than the first voltage minimum value of 10.8V, the microprocessor 300 executes a low voltage shutdown operation S3031, and shuts down the output of the power output circuit 400 or resets the whole machine;
(2) when the output value of the low voltage detection terminal AD1 is greater than the first voltage minimum value by 10.8V, and the output value of the high voltage detection terminal AD2 is less than the first voltage maximum value by 16V, the microprocessor 300 performs step S3032;
step S3032: entering a first power management state and controlling the power output circuit 400 to start up normally; preferably, the first power management state is a power-on and operation control operation for a 12V power management system.
(3) When the output value of the low voltage detection terminal AD1 is greater than the first voltage maximum value 16V and the output value of the high voltage detection terminal AD2 is less than the second voltage minimum value 18V, the microprocessor 300 performs an abnormal voltage shutdown operation S3033, and shuts down the output of the power output circuit 400 or resets the whole machine;
(4) when the output value of the low voltage detection terminal AD1 is greater than the second voltage minimum value 18V, and the output value of the high voltage detection terminal AD2 is less than the second voltage maximum value 32V, the microprocessor 300 performs step S3034;
step S3034: entering a second power management state and controlling the power output circuit 400 to start up normally; preferably, the second power management state is a power-on and operation control operation for a 24V power management system.
(5) And when the output value of the low voltage detection terminal AD1 and the output value of the high voltage detection terminal AD2 are both greater than the second voltage maximum value 32V, the microprocessor 300 performs a high voltage shutdown operation S3035 to shut down the output of the power output circuit 400 or reset the entire device.
Further, after the microprocessor 300 enters the first power management state S3032, when the output value of the high voltage detection terminal AD2 is less than the first voltage minimum value of 10.8V, the method further includes:
if the microprocessor 300 detects that the current output value of the low voltage detection terminal AD1 is greater than or equal to 6V and the duration T is less than a preset starting time T (e.g., T equals 21 seconds), the microprocessor 300 performs operation S3036;
step S3036: and starting a 6V voltage start-stop function.
If the microprocessor 300 detects that the current output value of the low voltage detection terminal AD1 is less than 6V and the duration T is greater than a preset start-up time T (e.g., T is 21 seconds), the microprocessor 300 performs a low voltage shutdown operation S3031 to shut down the output of the power output circuit 400 or reset the entire device.
On the other hand, after the microprocessor 300 enters the first power management state S3032, when the output value of the high voltage detection terminal AD2 is greater than the first maximum voltage value 16V, the method further includes:
the microprocessor 300 performs a high voltage shutdown operation S3035 to turn off the output of the power output circuit 400 or reset the entire device.
Further, after the microprocessor 300 enters the second power management state S3034, when the output value of the high voltage detection terminal AD2 is less than the second voltage minimum value 18V, the method further includes:
if the microprocessor 300 detects that the current output value of the low voltage detection terminal AD1 is greater than or equal to 8V and the duration T is less than a preset starting time T (e.g., T equals 21 seconds), the microprocessor 300 performs operation S3037;
step S3037: and starting the 8V voltage start-stop function.
If the microprocessor 300 detects that the current output value of the low voltage detection terminal AD1 is greater than 8V and the duration T is greater than a preset start-up time T (e.g., T is 21 seconds), the microprocessor 300 performs a low voltage shutdown operation S3031 to shut down the output of the power output circuit 400 or reset the entire device.
On the other hand, after the microprocessor 300 enters the second power management state S3034, when the output value of the high voltage detection terminal AD2 is greater than the second maximum voltage value 32V, the method further includes:
the microprocessor 300 performs a high voltage shutdown operation S3035 to turn off the output of the power output circuit 400 or reset the entire device.
The MCU turns off the output of the power output circuit 400 for protection until the automobile storage battery (B +) is powered off or the complete machine is reset, and then the next round of power-on initialization and re-judgment are carried out.
The vehicle power supply automatic identification protection method provided by the embodiment of the invention is characterized in that a voltage division detection circuit is constructed for a vehicle power supply, the vehicle power supply is subjected to voltage division, sampling, comparison and analysis through a low-voltage sampling circuit, a high-voltage sampling circuit and a microprocessor in the vehicle power supply, and a corresponding control signal is output according to the running state of a vehicle to perform adaptive control on the output voltage of a power supply output circuit. On one hand, the invention realizes the identification adaptation, high voltage protection and low voltage protection of a 12V power supply system and is compatible with the starting and stopping functions of 6V of the automobile; on the other hand, the invention realizes the identification adaptation, high voltage protection and low voltage protection of a 24V power supply system and is compatible with the 8V starting and stopping function of the automobile; and the protection of abnormal voltage between two power management systems of the vehicle is realized. The technical scheme provided by the invention has the advantages of low circuit construction cost, easiness in realization, high automation degree and high practicability.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (5)

1. A vehicle power supply automatic identification protection method is characterized by comprising the following steps:
constructing a voltage division detection circuit for a vehicle power supply; the voltage division detection circuit comprises a low-voltage sampling circuit, a high-voltage sampling circuit, a microprocessor and a power supply output circuit;
the low-voltage sampling circuit divides and samples the vehicle power supply and outputs a sampling result to the microprocessor through the low-voltage detection end; the high-voltage sampling circuit divides and samples the vehicle power supply and outputs a sampling result to the microprocessor through the high-voltage detection end;
the microprocessor outputs corresponding control signals to manage and control the output voltage of the power output circuit according to the output values and the duration time of the low-voltage detection end and the high-voltage detection end; the method specifically comprises the following steps:
after the voltage division detection circuit is powered on and lasts for preset initialization time, the microprocessor detects output values of the low-voltage detection end and the high-voltage detection end;
comparing the output values of the low-voltage detection end and the high-voltage detection end with a set first voltage minimum value, a set first voltage maximum value, a set second voltage minimum value and a set second voltage maximum value respectively;
the microprocessor switches the working state of the power supply according to the comparison result and controls the power-on or power-off operation of the power supply output circuit; the method specifically comprises the following steps:
when the output value of the low-voltage detection end and the output value of the high-voltage detection end are both smaller than the first voltage minimum value, the microprocessor executes low-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine;
when the output value of the low-voltage detection end is greater than the first voltage minimum value and the output value of the high-voltage detection end is smaller than the first voltage maximum value, the microprocessor enters a first power supply management state and controls the power supply output circuit to be normally started;
when the output value of the low-voltage detection end is larger than the first voltage maximum value and the output value of the high-voltage detection end is smaller than the second voltage minimum value, the microprocessor executes abnormal voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine;
when the output value of the low-voltage detection end is greater than the second voltage minimum value and the output value of the high-voltage detection end is smaller than the second voltage maximum value, the microprocessor enters a second power supply management state and controls the power supply output circuit to be normally started;
and when the output value of the low-voltage detection end and the output value of the high-voltage detection end are both greater than the second voltage maximum value, the microprocessor executes high-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
2. The vehicle power supply automatic identification protection method according to claim 1, wherein when the output value of the high voltage detection terminal is less than the first voltage minimum value after the microprocessor enters the first power management state, the method further comprises:
if the microprocessor detects that the output value of the current low-voltage detection end is greater than or equal to 6V and the duration time is less than the preset starting time, starting a 6V voltage starting and stopping function by the microprocessor;
and if the microprocessor detects that the current output value of the low-voltage detection end is less than 6V and the duration time is longer than the preset starting time, the microprocessor executes low-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
3. The vehicle power supply automatic identification protection method according to claim 1, wherein when the output value of the high voltage detection terminal is greater than the first voltage maximum value after the microprocessor enters the first power management state, the method further comprises:
and the microprocessor executes high-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
4. The vehicle power supply automatic identification protection method according to claim 1, wherein when the output value of the high voltage detection terminal is less than the second voltage minimum value after the microprocessor enters the second power management state, the method further comprises:
if the microprocessor detects that the output value of the current low-voltage detection end is greater than or equal to 8V and the duration time is less than the preset starting time, starting the 8V voltage starting and stopping function by the microprocessor;
and if the microprocessor detects that the current output value of the low-voltage detection end is greater than 8V and the duration time is greater than the preset starting time, the microprocessor executes low-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
5. The vehicle power supply automatic identification protection method according to claim 1, wherein when the output value of the high voltage detection terminal is greater than the second voltage maximum value after the microprocessor enters the second power management state, the method further comprises:
and the microprocessor executes high-voltage shutdown operation, and closes the output of the power output circuit or resets the whole machine.
CN201710298077.5A 2017-04-30 2017-04-30 Automatic recognition protection method for vehicle power supply Active CN107134824B (en)

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