CN117009174A

CN117009174A - Power supply control method, system, equipment and storage medium

Info

Publication number: CN117009174A
Application number: CN202310784161.3A
Authority: CN
Inventors: 陈泳龙; 徐立人; 韩旭
Original assignee: Guangzhou Weride Technology Co Ltd
Current assignee: Guangzhou Weride Technology Co Ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-11-07

Abstract

The invention relates to the field of automatic driving control, and discloses a power supply control method, a system, equipment and a storage medium. The method comprises the following steps: and sending a clock signal to the latch circuit, outputting a corresponding enabling signal based on a power-on pre-condition of the vehicle at the current moment, judging whether the clock signal is at a rising edge at the current moment when the enabling signal is an effective level signal, if so, generating a corresponding switch enabling signal based on the clock signal, and outputting the corresponding switch enabling signal to the power supply switch control processing unit for power-on. The latch circuit based on the D trigger is designed on the circuit, so that the power-on time sequence design of the processing unit is met, and the power supply of the operation unit is not influenced when the coprocessor is abnormal.

Description

Power supply control method, system, equipment and storage medium

Technical Field

The invention relates to the field of automatic driving control, in particular to a power supply control method, a system, equipment and a storage medium.

Background

In the prior art, the power-on control of the processing unit is performed through the combination of a coprocessor (MCU) and a high-performance processing unit, in the framework, the high-performance processing unit is responsible for image and algorithm processing, and the coprocessor is responsible for the control of a low-speed interface and a power-on time sequence. For the high-performance processing unit, the power supply switch is controlled by the coprocessor, but in the existing power supply control method, the processor directly powers on the processing unit according to the power supply, if the circuit does not perform any treatment, when the coprocessor has abnormal operation working conditions, the operation unit can be affected by abnormal power on and off conditions, so that the running safety of a vehicle is affected. Therefore, there is a need for a method that satisfies the power-up timing of a high performance processing unit and ensures that the power supply of the arithmetic unit is not affected even when an exception occurs in the coprocessor.

Disclosure of Invention

The invention mainly aims to solve the technical problems that the power supply control is single and the abnormal situation cannot be reported in the existing power supply method.

The first aspect of the present invention provides a power supply control method, in which a power supply switch controlled by a latch circuit is provided between a control unit and a processing unit, the latch circuit has two input terminals and an output terminal, the two input terminals are used for receiving a clock signal and an enable signal output by the control unit, the power supply control method includes: the control unit is controlled to send a clock signal to the latch circuit, a power-on precondition of the vehicle at the current moment is detected, and a corresponding enabling signal is output based on the power-on precondition, wherein the power-on precondition comprises an ignition signal, voltage and temperature; when the enabling signal is an effective level signal, judging whether the clock signal is at a rising edge at the current moment; and if the power supply switch control processing unit is at the rising edge, generating a corresponding switch enabling signal based on the clock signal, and outputting the corresponding switch enabling signal to the power supply switch control processing unit for power-up.

Optionally, in a first implementation manner of the first aspect of the present invention, before the controlling the control unit to send a clock signal to the latch circuit and detect a power-on precondition of a current moment of the vehicle, outputting a corresponding enable signal based on the power-on precondition includes: judging whether the power management unit receives direct current power supply or not; if yes, powering up the power management unit based on the direct current power supply, and powering up the control unit based on the power management unit; or detecting whether an ignition signal exists when the control unit is in a power-down state; if so, the power management unit is awakened, and the control unit is powered on based on the power management unit.

Optionally, in a second implementation manner of the first aspect of the present invention, the controlling the control unit to send a clock signal to the latch circuit, detect a power-on precondition of a current moment of the vehicle, and output a corresponding enable signal based on the power-on precondition includes: after the control unit is electrified, a clock signal is sent to the latch circuit, and whether an ignition signal is received or not is judged; if not, updating the state of the power management unit into a standby mode, and circularly detecting whether an ignition signal exists in a preset time period; if the power supply voltage is received, starting a voltage detection module and a temperature detection module, and detecting the voltage value of the power supply and the temperature of each hardware based on the voltage detection module and the temperature detection module to obtain a detection result; and determining the power-on state of the vehicle at the current moment based on the detection result, and outputting a corresponding enabling signal based on the power-on state.

Optionally, in a third implementation manner of the first aspect of the present invention, the enabling the voltage detection module and the temperature detection module, and based on the voltage detection module and the temperature detection module to detect a voltage value of the power supply and a temperature of each hardware, obtaining a detection result includes: acquiring a voltage value of a power supply based on a voltage detection module, and judging whether the voltage value is within a preset voltage range; if the voltage is within the preset voltage range, confirming that the detection result of the voltage detection module is that the voltage is normal; if the voltage is not in the preset voltage range, confirming that the detection result of the voltage detection module is abnormal; starting a temperature detection module, acquiring the temperature of each hardware based on a temperature sensor, and judging whether the temperature is not more than a preset temperature; if the temperature is not greater than the preset temperature, confirming that the detection result of the temperature detection module is that the temperature is normal; if the temperature is higher than the preset temperature, confirming that the detection result of the temperature detection module is abnormal.

Optionally, in a fourth implementation manner of the first aspect of the present invention, the determining a power-on state of the vehicle at the current moment based on the detection result, and outputting a corresponding enabling signal based on the power-on state, includes: judging that the detection result is that the temperature is normal and the voltage is normal; if the detection result is that the temperature is normal and the voltage is normal, outputting a high-level enabling signal, and confirming that the high-level enabling signal is an effective level signal; if the detection result is not that the temperature is normal and the voltage is normal, fault information is received, the fault information is reported, and a low-level enabling signal is output.

Optionally, in a fifth implementation manner of the first aspect of the present invention, if the signal is at a rising edge, a corresponding switch enable signal is generated based on the clock signal, and the signal is output to the power supply switch control processing unit to power up, where the power supply switch control processing unit includes: based on the rising edge states of the effective level signal and the clock signal, the latch circuit is connected with the power supply switch electrically; transmitting a switch enable signal to the power switch through the electrical connection based on a high level state after a rising edge of a clock signal; and switching on the power supply switch based on the switch enabling signal, and controlling the processing unit to be powered on.

Optionally, in a sixth implementation manner of the first aspect of the present invention, after the generating, based on the clock signal, a corresponding switch enable signal and outputting the switch enable signal to the power supply switch control processing unit to power up if the switch enable signal is at a rising edge, the method further includes: when the processing unit is electrified, monitoring whether the output state of the enabling pin of the control unit is changed or not; if the clock signal is changed, acquiring the clock signal output by the control unit, and judging whether the clock signal at the current moment is at the rising edge or not; if the power supply state is not in the rising edge, the output signal of the latch circuit is not changed, and the power supply state of the processing unit is not changed.

A second aspect of the present invention provides a power supply control system including a control unit, a latch circuit and a power supply switch, the power supply switch being controlled by the latch circuit, the latch circuit having two input terminals for receiving a clock signal and an enable signal output from the control unit and an output terminal, the power supply control system including:

the control unit is used for sending a clock signal to the latch circuit, detecting a power-on precondition of the vehicle at the current moment, and outputting a corresponding enabling signal based on the power-on precondition, wherein the power-on precondition comprises an ignition signal, voltage and temperature;

The latch circuit is used for judging whether the clock signal is at the rising edge at the current moment when the enabling signal is an effective level signal;

the latch circuit is further used for generating a corresponding switch enabling signal based on the clock signal and outputting the corresponding switch enabling signal to the power supply switch control processing unit for power-on if the latch circuit is at the rising edge.

Optionally, in a first implementation manner of the second aspect of the present invention, the control unit includes:

the receiving subunit is used for sending a clock signal to the latch circuit after the control unit is electrified and judging whether an ignition signal is received or not; when not received, the state of the power management unit is updated to be in a standby mode, and whether an ignition signal exists or not is circularly detected in a preset time period;

the starting subunit is used for starting the voltage detection module and the temperature detection module when receiving the power supply voltage value and the temperature of each hardware, and obtaining a detection result based on the voltage detection module and the temperature detection module;

and the output subunit is used for determining the power-on state of the vehicle at the current moment based on the detection result and outputting a corresponding enabling signal based on the power-on state.

Optionally, in a second implementation manner of the second aspect of the present invention, the receiving subunit is further configured to determine whether the power management unit receives a dc power supply; if yes, powering up the power management unit based on the direct current power supply, and powering up the control unit based on the power management unit; or detecting whether an ignition signal exists when the control unit is in a power-down state; if so, the power management unit is awakened, and the control unit is powered on based on the power management unit.

Optionally, in a third implementation manner of the second aspect of the present invention, the enabling subunit is further configured to obtain a voltage value of the power supply based on the voltage detection module, and determine whether the voltage value is within a preset voltage range; if the voltage is within the preset voltage range, confirming that the detection result of the voltage detection module is that the voltage is normal; if the voltage is not in the preset voltage range, confirming that the detection result of the voltage detection module is abnormal; starting a temperature detection module, acquiring the temperature of each hardware based on a temperature sensor, and judging whether the temperature is not more than a preset temperature; if the temperature is not greater than the preset temperature, confirming that the detection result of the temperature detection module is that the temperature is normal; if the temperature is higher than the preset temperature, confirming that the detection result of the temperature detection module is abnormal.

Optionally, in a fourth implementation manner of the second aspect of the present invention, the output subunit is further configured to determine that the detection result is that the temperature is normal and the voltage is normal; if the detection result is that the temperature is normal and the voltage is normal, outputting a high-level enabling signal, and confirming that the high-level enabling signal is an effective level signal; if the detection result is not that the temperature is normal and the voltage is normal, fault information is received, the fault information is reported, and a low-level enabling signal is output.

Optionally, in a fifth implementation manner of the second aspect of the present invention, the latch circuit includes:

the connection subunit is used for switching on the electric connection between the latch circuit and the power supply switch based on the rising edge states of the effective level signal and the clock signal;

the upper electronic unit is used for sending a switch enabling signal to the power supply switch through the electric connection based on a high level state after the rising edge of the clock signal; and switching on the power supply switch based on the switch enabling signal, and controlling the processing unit to be powered on.

Optionally, in a sixth implementation manner of the second aspect of the present invention, the latch circuit further includes:

the monitoring subunit is used for monitoring whether the output state of the enabling pin of the control unit is changed or not after the processing unit is electrified; if the clock signal is changed, acquiring the clock signal output by the control unit, and judging whether the clock signal at the current moment is at the rising edge or not; if the power supply state is not in the rising edge, the output signal of the latch circuit is not changed, and the power supply state of the processing unit is not changed.

A third aspect of the present invention provides a power supply control apparatus including a memory and at least one processor, the memory having instructions stored therein; the at least one processor invokes the instructions in the memory to cause the power control device to perform the steps of the power control method as described above.

A fourth aspect of the present invention provides a computer-readable storage medium having instructions stored thereon, which when executed by a processor, implement the steps of the power supply control method as described above.

According to the technical scheme provided by the invention, the clock signal is sent to the latch circuit, the corresponding enabling signal is output based on the power-on precondition of the current moment of the vehicle, when the enabling signal is an effective level signal, whether the clock signal is at the rising edge at the current moment is judged, if so, the corresponding switch enabling signal is generated based on the clock signal, and the corresponding switch enabling signal is output to the power supply switch control processing unit for power-on. According to the scheme, the latch circuit is arranged in the combination of the coprocessor and the high-performance computing unit, and the latch circuit based on the D trigger is designed on the circuit, so that the power-on time sequence design of the processing unit is met, the power supply of the computing unit is not influenced when the coprocessor is abnormal, the power supply control cost of the processing unit is reduced, and the power supply control efficiency and convenience of the processing unit are improved.

Drawings

Fig. 1 is a schematic diagram of a first embodiment of a power supply control method according to an embodiment of the present application;

fig. 2 is a schematic diagram of a second embodiment of a power supply control method according to an embodiment of the present application;

fig. 3 is a power-on logic schematic diagram of a power supply control method according to an embodiment of the present application;

fig. 4 is a schematic diagram of a power-on control circuit of a processing unit according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a power supply control system according to an embodiment of the present application;

fig. 6 is a schematic diagram of another structure of a power supply control system according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a power supply control device according to an embodiment of the present application.

Detailed Description

For the existing power supply control mode of the processing unit, the application sends the clock signal to the latch circuit, outputs the corresponding enabling signal based on the power-on precondition of the current moment of the vehicle, judges whether the clock signal is at the rising edge at the current moment when the enabling signal is an effective level signal, generates the corresponding switch enabling signal based on the clock signal if the clock signal is at the rising edge, and outputs the corresponding switch enabling signal to the power supply switch control processing unit for power-on. The scheme ensures that the high-performance processing unit starts to work under the condition that the input voltage and the on-board temperature are normal, also meets the logic of powering on and OFF of an automobile ignition signal control system, ensures low power consumption under the condition of IGN OFF, ensures normal power supply of the high-performance processing unit under the abnormal working condition of the MCU, and improves the power supply control efficiency of the processing unit.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

For easy understanding, the following describes a specific flow of an embodiment of the present invention, and please refer to fig. 1 for a schematic diagram of a first embodiment of a power supply control method provided by the embodiment of the present invention, where the method specifically includes the following steps:

101. and sending a clock signal to the latch circuit, detecting the power-on precondition of the vehicle at the current moment, and outputting a corresponding enabling signal based on the power-on precondition.

Before the MCU is used for powering on the processing unit, the power supply voltage range, the power supply stability requirement, the power-on sequence and other power supply related characteristics and requirements of the processing unit can be known by knowing the power supply requirement of the processing unit; configuring GPIO pins of the MCU, selecting an appropriate GPIO pin as a control pin for controlling a power supply switch, and ensuring that the selected pin is correctly connected with a power supply and a ground wire of the MCU; programming MCU to control the pin state, programming a code to control the state of the GPIO pin by using a programming tool and a programming language of the MCU, and controlling the switch state of the power supply switch by setting the pin to an appropriate level state (high level or low level); and controlling the power supply switch, and setting the GPIO pin to be in a proper state at a proper time when coding and writing codes so as to control the power supply switch to be turned on or turned off, and controlling the power-on of the processing unit by the MCU through controlling the state of the pin so as to realize power-on management.

The power-on precondition comprises ignition signal detection, voltage detection and temperature detection, a power supply switch controlled by a latch circuit is arranged between the control unit and the processing unit, the latch circuit is provided with two input ends and an output end, the two input ends are used for receiving clock signals and enabling signals output by the control unit, the method is suitable for a high-performance processing platform formed by a framework of a coprocessor and a high-performance processing unit, the coprocessor is an auxiliary processor and works in cooperation with a main processor (such as a CPU), and the high-performance computing platform consists of a plurality of processing units and the coprocessor. In an automatic driving system, a latch circuit controlled by an MCU is utilized to power up a processing unit, the MCU serves as a central control unit, coordinates the power-up sequence and ensures that the voltage is at a proper level before the processing unit is started, the MCU serves as a main control unit and is responsible for managing the power-up sequence, necessary input/output pins, an analog-to-digital converter and software functions are provided, the latch circuit serves as a buffer between the MCU and the processing unit and receives control signals from the MCU and is used for enabling or disabling a power supply of the processing unit, and the latch circuit comprises logic gates, triggers and other proper circuits and provides stable and controllable power-up functions.

Further, the MCU may also initiate a power-up sequence by providing a control signal to the latch circuit that determines whether the processing unit is to receive power or to maintain a power-down state, the latch circuit latches the control signal and maintains the power-up state of the processing unit until the MCU issues other instructions. The MCU integrates voltage monitoring and protection mechanisms to ensure that the power supplied to the processing unit remains within a specified voltage range, voltage sensors and comparators are used to monitor the voltage level, and if the voltage exceeds or falls below acceptable limits, the MCU will take appropriate action.

Preconditions for powering up a processing unit typically include: the power supply preparation, which is to ensure that the power supply provided to the processing unit meets the requirements of the processing unit, including the power supply voltage range, the current capacity, the stability, the noise requirement and the like, and the proper power supply is prepared and stable and reliable and meets the requirements of the processing unit before power-on; a power connection to correctly connect the power to the power pins of the processing unit, ensuring that the correct power polarity is connected, and using appropriate connectors and power lines; the power-on sequence requires that the power supply is provided according to a specific power-on sequence, and in general, the core power supply is powered on first and then the peripheral power supply is powered on; external circuitry is ready to ensure that external circuitry associated with the processing unit (e.g., clock source, reset circuitry, etc.) is ready and meets the processing unit requirements, possibly involving configuration of the clock source, design of the reset circuitry, etc.; signal integrity, in order to ensure signal integrity and stability, factors such as impedance matching, wiring specification, ground design and the like of a signal wire need to be considered before a processing unit is powered on; temperature control, some processing units may require ambient temperature to ensure that temperature control measures have been taken to maintain the processing unit within a suitable operating temperature range prior to powering up the processing unit.

When an ignition signal exists, starting a voltage detection module and a temperature detection module, judging whether a pre-power-on condition is met by using the voltage detection module and the temperature detection module, if not, obtaining fault information through two interfaces and obtaining the fault information through a debugging interface of an MCU, wherein the interfaces are mainly used in a test development stage and in field troubleshooting because of limitation due to the fact that the debugging interface is required to be accessed; the temperature information and fault information are contained in the network packets by sending them through an external ethernet interface, which can be obtained remotely if it is connected to the 4G/5G route. The voltage monitoring and the temperature monitoring are two independent monitoring modules, the two monitoring modules can return detection values, the MCU judges whether the returned values are in a normal range according to a set threshold value, and the two modules respectively have two abnormal states and normal states.

102. When the enable signal is an active level signal, whether the clock signal is at a rising edge at the current moment is judged.

In the scheme, the output clock signal of the MCU is output by the GPIO port of the MCU, the clock signal can be output only after the voltage monitoring and the temperature monitoring are passed, and the rising edge refers to the process that the pin level jumps from low to high. Only when the voltage and the temperature are normal, the MCU output state is normal, the value of the corresponding D is 1, when the clock signal is the rising edge, the output Q is 1, and the latch circuit sends a switch enabling signal to the power supply switch, and the power supply switch is opened to supply power to the high-performance computing unit.

103. If the power supply is at the rising edge, a corresponding switch enabling signal is generated based on the clock signal and is output to the power supply switch control processing unit to be electrified.

In addition to using the switch enable signal, the power switch may also be controlled to control the powering up of the high performance processing unit by: the software control is that the power supply switch is controlled by using a software program of the MCU or other controllers, and the on-off state of the power supply switch is controlled by programming corresponding codes and GPIO pins of the MCU or other digital output signals under specific conditions, so that the power-on of the high-performance processing unit is controlled on the software level; the timer or timer is used for timing control of the switching state of the power supply switch, and the control signal is automatically triggered at a specific time point or after a period of time by setting the time parameter of the timer or timer, so that the power supply switch is controlled to be turned on or off, and the power supply switch is suitable for the situation that power-on or power-off operation is required according to a preset time table; the external trigger signal is utilized to trigger and control the switch state of the power supply switch, a sensor, external equipment or other external events can be used as the trigger signal, when the trigger signal meets a specific condition, the control signal is transmitted to the power supply switch through the logic circuit, so that the power-on or power-off operation is realized, and the power-on control device is suitable for controlling the power-on of the high-performance processing unit according to the external event or condition; a GPIO pin of the MCU controls the power switch using a general purpose input/output (GPIO) pin of a Micro Controller Unit (MCU), and the MCU may control a state of the power switch by setting a specific GPIO pin to a high level or a low level; a controller chip or module for controlling the power switch using a dedicated controller chip or module, the controller chip or module typically having a dedicated interface or pin for receiving the control signal and controlling the state of the power switch; software control, typically involving writing corresponding code in a software program running on an MCU or computer to generate and send control signals to a power switch; a timer or timing circuit, the state of the power switch being controlled according to a predetermined time interval or timing using the timer or timing circuit.

The scheme realizes stable power supply to the processing unit when the MCU works abnormally and the enabling state pin level is unstable through designing the latch circuit, meets the power-on time sequence design of the processing unit, and ensures that the power supply of the operation unit is not influenced when the coprocessor is abnormal.

Referring to fig. 2, a schematic diagram of a second embodiment of a power supply control method according to an embodiment of the present invention is shown, referring to fig. 3, a power-on logic diagram of the power supply control method according to an embodiment of the present invention is shown, and a power management unit is used to power on a control unit to determine whether there is a dc power supply; if so, powering up the power management unit based on direct current power supply and powering up the control unit, or detecting whether an ignition signal exists when the control unit is powered down, and if so, waking up the power management unit and powering up the control unit. And after the control unit is electrified, if the ignition signal is not detected, updating the mode of the power management unit into a standby mode, circularly detecting whether the ignition signal exists in a preset time period, waking up the power management unit and electrifying the control unit again if the ignition signal exists, and if the ignition signal does not exist, updating the state of the control unit into a power-down state, wherein the high-performance computing platform enters a low-power consumption mode. Referring to fig. 4, a schematic diagram of a power-on control circuit of a processing unit according to an embodiment of the present invention is provided, and when the power supply control method provided by the present invention is used for controlling the processing unit, a control switch of a latch circuit in a power supply control system is connected between the processing unit and a power supply. When the enabling signal is in a high level, the output end outputs a switch enabling signal, the power supply switch is turned on to allow current to pass, and when the enabling signal is in a low level, the power supply switch is in a turned-off state to block the flow of current. A physical switch or an electronic switch is used as the control switch, which indicates that the switch enable signal is active when the switch is in the closed state and indicates that the switch enable signal is inactive when the switch is in the open state. A control signal (e.g., a GPIO pin from an MCU) is used as the enable signal, which is asserted when the control signal is high and deasserted when the control signal is low. The enabling signal is connected with the control end of the power supply switch, the power supply switch can be a relay, a MOSFET, a BJT and the like, and the specific selection depends on the requirements of a circuit and the characteristics of a load, when the enabling signal is effective, the power supply switch is opened, the current can pass through, and when the enabling signal is ineffective, the power supply switch is closed, and the current is blocked.

The method specifically comprises the following steps:

201. the control unit is powered on based on direct current power supply, an ignition signal is detected after the control unit is powered on, and a power supply control program is started based on the ignition signal.

When the system is provided with DC-IN power supply, the PMIC of the MCU is powered on and supplies power to the MCU; detecting whether an IGN signal (automobile ignition signal) exists after the MCU is powered on, wherein the scheme refers to ORIN of NIVIDIA; if the MCU detects no IGN signal, the PMIC of the MCU enters a standby mode, and in the standby mode, the PMIC detects the IGN signal. When IGN is not available, the MCU is kept in a power-down state, the whole system is in a low-power consumption mode, and when IGN is available, the PMIC is awakened, and the MCU is powered on again; if the MCU detects the IGN signal, enabling the on-board input voltage detection module and the temperature detection module; when the input voltage and the on-board temperature are detected to be abnormal, the MCU can report faults through the external interface, and the high-performance processing unit can not be electrified at the moment so as to ensure the safety of the high-performance processing unit.

The MCU triggering by IGN signal means triggering a specific operation or event using IGN (Ignition) signal of MCU (Microcontroller Unit ). Such triggering is often associated with an automobile or internal combustion engine. In the control system of an automobile or an internal combustion engine, IGN signals are generally used to control the operation of an ignition system. When the MCU detects the triggering of the IGN signal, the ignition system is triggered by the IGN signal, so that the ignition coil emits high voltage to ignite the fuel-air mixture, thereby realizing the ignition of the internal combustion engine, controlling the starting and closing of the system, triggering the starting process and starting related operations or functions.

202. The control unit acquires vehicle data and judges whether a power-on precondition is satisfied.

The control unit may detect the temperature on the board by: internal temperature sensors, in which temperature sensors are integrated in some MCUs, can directly measure the temperature of a chip, and generally provide an ADC channel, and acquire temperature information of the chip by reading the value of the channel; external temperature sensor, if MCU does not have internal temperature sensor, can measure the temperature on the board through connecting external temperature sensor, the common external temperature sensor includes analog temperature sensor (such as NTC thermistor) and digital temperature sensor (such as DS18B 20), and through connecting with ADC channel or digital interface of MCU, transmit the temperature information to MCU to read and process; the thermistor network is used for converting the temperature into a voltage or current signal by forming a resistor voltage division network by the thermistor and other resistors, and then measuring and converting by using an ADC module of the MCU; I2C or SPI temperature sensor, for MCU with integrated I2C or SPI bus interface, can communicate with temperature sensor of specific model, these sensors provide the temperature reading through I2C or SPI agreement, MCU communicates with sensor through the corresponding communication agreement, and read the temperature data; the safety valve, some MCU chips have built-in safety valve (SAFETY VALVE) function, can detect the temperature abnormal condition, when the temperature exceeds the threshold value of settlement, MCU can trigger and break or take other predefined operations, in order to protect the system from the influence of overheated.

The control unit may detect the supply voltage by: an internal voltage reference source, most MCUs provide an internal reference voltage source, commonly referred to as an internal reference voltage or internal reference voltage, having a known regulated voltage value, which can be used as a reference for the supply voltage, by using which the MCU can estimate the magnitude of the supply voltage by comparing the ratio of the supply voltage to the reference voltage, the MCU typically having a dedicated ADC (analog-to-digital converter) module, which can be used to measure and convert the supply voltage; an external voltage detection circuit, such as a voltage comparator or a voltage monitoring chip, which can be connected to the supply voltage and monitor the variation of the supply voltage, and which generates a signal to inform the MCU of the abnormality of the supply voltage once the supply voltage exceeds a specific threshold range; ADC measurement, MCU usually has built-in ADC module, can be used for measuring the external voltage, through connecting a suitable voltage divider circuit to MCU's ADC pin, can divide the supply voltage into measurable range, and use ADC to measure; 4. built-in comparators, some MCUs may have built-in comparator modules that can be used to compare the relationship between the supply voltage and the reference voltage, and by connecting the supply voltage to the input pins of the comparator and setting the reference voltage, the comparator output can be used to determine if the supply voltage is within a set range.

203. If the power-on precondition is satisfied, a switch enable signal is output based on the enable signal corresponding to the power-on precondition.

In this embodiment, the following preparation steps are required to control the power-up of the high-performance computing unit through the D flip-flop: determining D Flip-Flop types, e.g., common D Flip-flops include positive Edge Triggered D Flip-Flop (P-positive Edge-Triggered D Flip-Flop) and Negative Edge Triggered D Flip-Flop (Negative Edge-Tr iggered D Flip-Flop); connecting the D trigger with the computing unit, and connecting the output of the D trigger with a power control pin of the computing unit, wherein the pin is commonly used for controlling the power-on and power-off operations of the computing unit; designing a control signal, which may be a clock signal or other suitable signal, to determine the control signal to be used to control the triggering of the D flip-flop; the control signal and the D flip-flop are connected, and the control signal is connected to a Clock (Clock) input terminal of the D flip-flop. For a positive edge triggering D flip-flop, when the rising edge of the clock signal arrives, the D flip-flop latches the value of the D input to the output, and for a negative edge triggering D flip-flop, when the falling edge of the clock signal arrives, the D flip-flop latches the value of the D input to the output; and testing and verifying the function of the D trigger in practical application, so that the computing unit can be correctly electrified when the D trigger receives a trigger signal and can be correctly electrified when the D trigger is not needed. The main components of the latch circuit are a D trigger, the voltage monitoring and the temperature monitoring are two independent monitoring modules, the detection value can be returned by the MCU, whether the returned value is in a normal range is judged by the MCU according to a set threshold value, the two modules are in abnormal and normal states, when the two modules are in normal, the D output is 1, when any one module is abnormal, the D output is 0, the MCU enabling output instability means that the state of the current MCU in the latch circuit is not controlled, at the moment, the D state is uncertain, the D state can be 0 or 1, at the moment, the D output is X, the Q output represents the latched data value or the current state of the trigger, when the D trigger is triggered by a clock signal, the value of the D input can be latched on the Q output, and the value of the Q is updated to the value of the D. The truth table for the D flip-flop is shown in the following table:

D	CLK	Q	QN
				0	Rising edge	0	1
1	Rising edge	1	0
				X	0	Q	QN
X	1	Q	QN

Wherein 1 represents a high level, 0 represents a low level, X represents either one of the values of D being 0 and 1, Q represents the output state of the latch circuit unchanged when Q is Q, and QN represents the output state of the latch circuit unchanged when QN is QN. In the D flip-flop, D and CLK are input signals representing a data input and a clock input, respectively, in this embodiment, D represents an enable signal, CLK represents a clock signal, Q represents a switch enable signal, and D input may be a level of logic 0 or logic 1 representing a data value to be stored. CLK is the clock signal input of the D flip-flop, which will trigger on the rising or falling edge of the clock according to the value of the D input and latch the value of the D input onto the output when the clock signal arrives. In this embodiment, the D flip-flop stores the input data and transfers it to the output when triggered by the clock signal, and is used in the sequential logic circuit to implement functions such as data storage, sequential control, and state storage. Specifically, when the clock signal arrives, the D flip-flop will trigger on the rising or falling edge of the clock according to the type of flip-flop (e.g., positive or negative edge trigger), at the time of triggering, the D flip-flop will latch the value of the D input into the internal memory, the stored value can be read through the output terminal Q, representing the current state of the D flip-flop or the stored data, and the output terminal QN is the complement or inverted output of Q. I.e. Q and QN are representations of the output signal, Q representing the main output (or positive output) of the D flip-flop, representing the current state or stored value of the D flip-flop, the value of the D input being latched onto the Q output when the flip-flop is triggered by the clock signal, QN representing the complement output (or inverted output) of the D flip-flop, which is the logical inverse of the Q output, QN being low when the Q output is high and high when the Q output is low, QN being used to construct complement or inverted logic in the logic circuit, Q and QN being complementary in most D flip-flops, i.e. their levels are exactly opposite. Further, the switch enable signal is used to control the operation of the sequential logic circuit, and when the switch enable signal is used to control the D flip-flop, the enable signal is logically operated with the D input to determine whether to load a new data value into the D flip-flop, so that the enable signal will play a role in controlling the update of the D flip-flop.

204. The power supply switch is controlled to power up the processing unit according to the switch enabling signal, and two input ends of the latch circuit are monitored based on vehicle data.

After the processing unit is electrified, the control unit monitors vehicle data, wherein the vehicle data comprises ignition signals, temperature, voltage and running conditions of the vehicle, and judges whether the vehicle needs to be electrified or electrified abnormally, if so, the processing unit is electrified or kept in an electrified locking state based on the latch circuit, namely, the power supply state of the high-performance processing unit needs to be changed to meet the change of the MCU enabling foot output state and the MCU output clock signal is in the rising edge.

According to the scheme, the clock signal is sent to the latch circuit, the corresponding enabling signal is output based on the power-on pre-condition of the vehicle at the current moment, when the enabling signal is an effective level signal, whether the clock signal is at the rising edge at the current moment is judged, if yes, the corresponding switch enabling signal is generated based on the clock signal, and the corresponding switch enabling signal is output to the power supply switch control processing unit for power-on. The latch circuit based on the D trigger is designed on the circuit, so that the power-on time sequence design of the processing unit is met, and the power supply of the operation unit is not influenced when the coprocessor is abnormal.

In the foregoing description of the power supply control method in the embodiment of the present invention, the power supply control system in the embodiment of the present invention is described in detail from the perspective of a modularized functional entity, referring to fig. 5, a schematic structural diagram of the power supply control system provided in the embodiment of the present invention is shown, where the power supply control system includes a control unit 501, a latch circuit 502, and a power supply switch 503, the power supply switch 503 is controlled by the latch circuit, the latch circuit 502 has two input ends and one output end, the two input ends are used for receiving a clock signal and an enable signal output by the control unit 501, and the power supply control system includes:

the control unit 501 is configured to send a clock signal to the latch circuit, detect a power-on precondition of a current moment of a vehicle, and output a corresponding enable signal based on the power-on precondition, where the power-on precondition includes an ignition signal, a voltage, and a temperature;

the latch circuit 502 is configured to determine whether the clock signal is at a rising edge at a current time when the enable signal is an active level signal;

the latch circuit 502 is further configured to generate a corresponding switch enable signal based on the clock signal if the latch circuit is at a rising edge, and output the switch enable signal to the power supply switch control processing unit for powering up.

According to the scheme, the latch circuit is arranged in the combination of the coprocessor and the high-performance computing unit, and the latch circuit based on the D trigger is designed on the circuit, so that the power-on time sequence design of the processing unit is met, and the power supply of the computing unit is not influenced when the coprocessor is abnormal.

Referring to fig. 6, another schematic structural diagram of a power supply control system according to an embodiment of the present invention is provided, the power supply control system includes a control unit 601, a latch circuit 602, and a power supply switch 603, the power supply switch 603 is controlled by the latch circuit, the latch circuit 602 has two input terminals and one output terminal, the two input terminals are used for receiving a clock signal and an enable signal output by the control unit 601, and the power supply control system includes:

the control unit 601 is configured to send a clock signal to the latch circuit, detect a power-on precondition of a vehicle at a current moment, and output a corresponding enable signal based on the power-on precondition, where the power-on precondition includes an ignition signal, a voltage, and a temperature;

the latch circuit 602 is configured to determine whether the clock signal is at a rising edge at a current time when the enable signal is an active level signal;

The latch circuit 602 is further configured to generate a corresponding switch enable signal based on the clock signal if the latch circuit is at a rising edge, and output the switch enable signal to the power supply switch control processing unit for powering up.

In this embodiment, the control unit 601 includes:

a receiving subunit 6011, configured to send a clock signal to the latch circuit after the control unit is powered on, and determine whether an ignition signal is received; when not received, the state of the power management unit is updated to be in a standby mode, and whether an ignition signal exists or not is circularly detected in a preset time period;

an enabling subunit 6012, configured to enable, when received, the voltage detection module and the temperature detection module, and obtain a detection result based on the voltage value of the power supply and the temperature of each hardware detected by the voltage detection module and the temperature detection module;

and an output subunit 6013, configured to determine a power-on state of the vehicle at the current moment based on the detection result, and output a corresponding enable signal based on the power-on state.

In this embodiment, the receiving subunit 6011 is further configured to determine whether the power management unit receives dc power; if yes, powering up the power management unit based on the direct current power supply, and powering up the control unit based on the power management unit; or detecting whether an ignition signal exists when the control unit is in a power-down state; if so, the power management unit is awakened, and the control unit is powered on based on the power management unit.

In this embodiment, the enabling subunit 6012 is further configured to obtain a voltage value of the power supply based on the voltage detection module, and determine whether the voltage value is within a preset voltage range; if the voltage is within the preset voltage range, confirming that the detection result of the voltage detection module is that the voltage is normal; if the voltage is not in the preset voltage range, confirming that the detection result of the voltage detection module is abnormal; starting a temperature detection module, acquiring the temperature of each hardware based on a temperature sensor, and judging whether the temperature is not more than a preset temperature; if the temperature is not greater than the preset temperature, confirming that the detection result of the temperature detection module is that the temperature is normal; if the temperature is higher than the preset temperature, confirming that the detection result of the temperature detection module is abnormal.

In this embodiment, the output subunit 6013 is further configured to determine that the detection result is that the temperature is normal and the voltage is normal; if the detection result is that the temperature is normal and the voltage is normal, outputting a high-level enabling signal, and confirming that the high-level enabling signal is an effective level signal; if the detection result is not that the temperature is normal and the voltage is normal, fault information is received, the fault information is reported, and a low-level enabling signal is output.

In this embodiment, the latch circuit 602 includes:

A connection subunit 6021, configured to switch on an electrical connection between the latch circuit and the power supply switch based on the rising edge states of the active level signal and the clock signal;

an upper electronic unit 6022 for transmitting a switch enable signal to the power supply switch through the electrical connection based on a high level state after a rising edge of a clock signal; and switching on the power supply switch based on the switch enabling signal, and controlling the processing unit to be powered on.

In this embodiment, the latch circuit 602 further includes:

a monitoring subunit 6023, configured to monitor whether the output state of the enable pin of the control unit changes when the processing unit is powered on; if the clock signal is changed, acquiring the clock signal output by the control unit, and judging whether the clock signal at the current moment is at the rising edge or not; if the power supply state is not in the rising edge, the output signal of the latch circuit is not changed, and the power supply state of the processing unit is not changed.

Fig. 5-6 above describe the medium power control system in the embodiment of the present invention in detail from the point of view of modularized functional entities, and the power control device in the embodiment of the present invention is described in detail from the point of view of hardware processing.

Fig. 7 is a schematic structural diagram of a power supply control device according to an embodiment of the present invention, where the power supply control device 700 may have a relatively large difference due to different configurations or performances, and may include one or more processors (central processing units, CPU) 710 (e.g., one or more processors) and a memory 720, and one or more storage media 730 (e.g., one or more mass storage devices) storing application programs 733 or data 732. Wherein memory 720 and storage medium 730 may be transitory or persistent. The program stored in the storage medium 730 may include one or more modules (not shown), each of which may include a series of instruction operations to the power supply control device 700. Still further, the processor 710 may be configured to communicate with the storage medium 730 and execute a series of instruction operations in the storage medium 730 on the power control device 700 to implement the methods provided by the implementations described above.

The power control device 700 may also include one or more power supplies 740, one or more wired or wireless network interfaces 750, one or more input/output interfaces 760, and/or one or more operating devices 731, such as Windows Serve, mac OS X, unix, linux, freeBSD, and the like. It will be appreciated by those skilled in the art that the configuration of the power supply control apparatus shown in fig. 7 is not limiting of the power supply control apparatus provided by the present invention, and may include more or fewer components than shown, or may be combined with certain components, or may be arranged with different components.

The present invention also provides a computer readable storage medium, which may be a non-volatile computer readable storage medium, or may be a volatile computer readable storage medium, where instructions are stored in the computer readable storage medium, where the instructions when executed on a computer cause the computer to perform the steps of the power supply control method provided in the foregoing embodiments.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus or device, unit described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power supply control method applied to a power supply control system, the power supply control system including a control unit, a latch circuit and a power supply switch, the power supply switch being controlled by the latch circuit, the latch circuit having two input terminals for receiving a clock signal and an enable signal output from the control unit and an output terminal for outputting a switch enable signal, the power supply control method comprising:

the control unit is controlled to send a clock signal to the latch circuit, the power-on precondition of the vehicle at the current moment is detected, and a corresponding enabling signal is output based on the power-on precondition;

when the enabling signal is an effective level signal, judging whether the clock signal is at a rising edge at the current moment;

and if the power supply switch control processing unit is at the rising edge, generating a corresponding switch enabling signal based on the clock signal, and outputting the corresponding switch enabling signal to the power supply switch control processing unit for power-up.

2. The power supply control method according to claim 1, characterized by, before the control unit is controlled to transmit a clock signal to the latch circuit and detect a power-on precondition at a current time of a vehicle, outputting a corresponding enable signal based on the power-on precondition, comprising:

Judging whether the power management unit receives direct current power supply or not; if yes, powering up the power management unit based on the direct current power supply, and powering up the control unit based on the power management unit;

or,

detecting whether an ignition signal exists when the control unit is in a power-down state; if so, the power management unit is awakened, and the control unit is powered on based on the power management unit.

3. The power supply control method according to claim 1, wherein the controlling the control unit to transmit a clock signal to the latch circuit and detect a power-on precondition for a current time of the vehicle, and output a corresponding enable signal based on the power-on precondition, includes:

after the control unit is electrified, a clock signal is sent to the latch circuit, and whether an ignition signal is received or not is judged;

if not, updating the state of the power management unit into a standby mode, and circularly detecting whether an ignition signal exists in a preset time period;

if the power supply voltage is received, starting a voltage detection module and a temperature detection module, and detecting the voltage value of the power supply and the temperature of each hardware based on the voltage detection module and the temperature detection module to obtain a detection result;

And determining the power-on state of the vehicle at the current moment based on the detection result, and outputting a corresponding enabling signal based on the power-on state.

4. The power supply control method according to claim 3, wherein the enabling the voltage detection module and the temperature detection module, and obtaining the detection result based on the voltage value of the power supply and the temperature of each hardware detected by the voltage detection module and the temperature detection module, includes:

acquiring a voltage value of a power supply based on a voltage detection module, and judging whether the voltage value is within a preset voltage range;

if the voltage is within the preset voltage range, confirming that the detection result of the voltage detection module is that the voltage is normal; if the voltage is not in the preset voltage range, confirming that the detection result of the voltage detection module is abnormal;

starting a temperature detection module, acquiring the temperature of each hardware based on a temperature sensor, and judging whether the temperature is not more than a preset temperature;

if the temperature is not greater than the preset temperature, confirming that the detection result of the temperature detection module is that the temperature is normal; if the temperature is higher than the preset temperature, confirming that the detection result of the temperature detection module is abnormal.

5. The power supply control method according to claim 3, wherein the determining a power-on state of the vehicle at the current time based on the detection result, and outputting a corresponding enable signal based on the power-on state, includes:

Judging that the detection result is that the temperature is normal and the voltage is normal;

if the detection result is that the temperature is normal and the voltage is normal, outputting a high-level enabling signal, and confirming that the high-level enabling signal is an effective level signal;

if the detection result is not that the temperature is normal and the voltage is normal, fault information is received, the fault information is reported, and a low-level enabling signal is output.

6. The power supply control method according to any one of claims 1 to 5, wherein the generating a corresponding switch enable signal based on the clock signal if on a rising edge, and outputting to the power supply switch control processing unit for power-up, includes:

based on the rising edge states of the effective level signal and the clock signal, the latch circuit is connected with the power supply switch electrically;

transmitting a switch enable signal to the power switch through the electrical connection based on a high level state after a rising edge of a clock signal;

and switching on the power supply switch based on the switch enabling signal, and controlling the processing unit to be powered on.

7. The power supply control method according to claim 6, further comprising, after the power supply switch control processing unit is powered on, generating a corresponding switch enable signal based on the clock signal if the power supply switch control processing unit is on:

When the processing unit is electrified, monitoring whether the output state of the enabling pin of the control unit is changed or not;

if the clock signal is changed, acquiring the clock signal output by the control unit, and judging whether the clock signal at the current moment is at the rising edge or not;

if the power supply state is not in the rising edge, the output signal of the latch circuit is not changed, and the power supply state of the processing unit is not changed.

8. A power supply control system, characterized in that the power supply control system includes a control unit, a latch circuit and a power supply switch, the power supply switch is controlled by the latch circuit, the latch circuit has two input terminals for receiving a clock signal and an enable signal output by the control unit, and one output terminal for outputting a switch enable signal, the power supply control system includes:

9. A power control device comprising a memory and at least one processor, the memory having instructions stored therein; the at least one processor invokes the instructions in the memory to cause the power control device to perform the steps of the power control method of any one of claims 1-7.

10. A computer readable storage medium having instructions stored thereon, which when executed by a processor, implement the steps of the power supply control method according to any one of claims 1-7.