A vehicle-mounted DVR main power circuit control method, device and readable medium

Abstract

The present invention discloses a method, device, and readable medium for controlling the main power circuit of a vehicle-mounted DVR. When the vehicle-mounted DVR is powered on and running normally, the detected status of the ACC, vehicle-mounted battery power supply, supercapacitor module, and / or battery module is obtained. When the vehicle-mounted battery power supply is in an undervoltage or power-off state and the undervoltage or power-off duration exceeds a time threshold, the vehicle enters a delayed shutdown state and starts a delayed shutdown timer. At this time, the battery module or supercapacitor module can be selected to power the SOC module and peripheral modules. When the voltage of the battery module or supercapacitor module is lower than the corresponding threshold voltage, the vehicle-mounted DVR performs a forced shutdown. In response to the voltage of the battery module or supercapacitor module not being lower than the corresponding threshold voltage, the battery module or supercapacitor module provides power and disconnects the buck-boost module after the delayed shutdown time is reached. The vehicle-mounted DVR performs shutdown protection and then shuts down. The present invention can prevent the influence of pulse interference on the vehicle-mounted battery power supply, which may cause power supply problems.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted DVR power supply control, and in particular to a vehicle-mounted DVR main power circuit control method, device and readable medium. Background Art

[0002] Current vehicle-mounted DVR equipment must meet the requirements of ISO7637, ISO16750, and GB19056 standards to adapt to the environment where vehicle-mounted equipment experiences severe voltage fluctuations, as well as the equipment's operation requirements for a certain period of time during power outages in trucks and trucks. Some existing vehicle-mounted DVR equipment cannot fully meet these requirements, while others have high implementation costs and complex solutions.

[0003] The ISO7637 standard, specifically the 5,000-cycle P1 negative voltage pulse and P4 falling pulse interference, also has certain pulse width requirements. This pulse interference can affect and interfere with the vehicle's main battery's power supply to the onboard DVR, disrupting the DVR's operation and preventing timely data storage or causing hardware damage. Therefore, it is urgent to design a vehicle DVR main power circuit control method that meets the requirements of the ISO7637, ISO16750, and GB19056 standards for vehicle DVRs, as well as the practical requirements for the vehicle DVR to operate within a certain period of time after the vehicle's main battery is disconnected. Summary of the Invention

[0004] In view of the fact that the vehicle-mounted DVR is susceptible to pulse interference and thus has power supply problems, the embodiment of the present application aims to provide a vehicle-mounted DVR main power circuit control method, device and readable medium to solve the technical problems mentioned in the above background technology section.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling a main power supply circuit of a vehicle-mounted DVR, wherein the main power supply circuit of the vehicle-mounted DVR includes a power on / off control module, a buck-boost module, a backup power supply module, and a power switching module, wherein the backup power supply module includes a supercapacitor module and / or a battery module, the power on / off control module is connected to the buck-boost module, the buck-boost module is used to convert the voltage of the vehicle battery power supply, the buck-boost module and the backup power supply module are respectively connected to the power switching module, and the power switching module is used to switch the buck-boost module and the backup power supply module to power the SOC module and the peripheral modules according to the voltage provided by the buck-boost module and the backup power supply module, comprising the following steps:

[0006] S1, when the vehicle DVR is powered on and running normally, obtain the status of the detected ACC, vehicle battery power supply, super capacitor module and / or battery module;

[0007] S2, in response to the vehicle battery power supply being in an undervoltage or power-off state and the undervoltage or power-off duration exceeding a time threshold, entering a delayed shutdown state and starting a delayed shutdown timer;

[0008] S3, in response to the voltage of the battery module or super capacitor module being lower than the corresponding threshold voltage, the vehicle DVR performs a forced shutdown. In response to the voltage of the battery module or super capacitor module not being lower than the corresponding threshold voltage, the battery module or super capacitor module provides power and cuts off the buck-boost module after the delayed shutdown time is reached. The vehicle DVR performs shutdown protection and then shuts down.

[0009] Preferably, before step S1, the method further includes:

[0010] Determine whether the vehicle DVR startup conditions are met. If so, the vehicle DVR is started normally, and the vehicle battery power is started to supply power to the vehicle DVR main power circuit. Otherwise, determine whether ACC is at a high level. If so, it is in standby state and repeats this step. Otherwise, the vehicle DVR is directly shut down.

[0011] Preferably, when the ACC generated by the vehicle battery power supply is powered on for the first time is high or the ACC generated by the power on / off control module during the subsequent power-on process is high, the ACC received by the buck-boost module is at a high level and the buck-boost module is enabled, and the buck-boost module is used to convert the voltage of the vehicle battery power supply.

[0012] As an option, it also includes:

[0013] S4, in response to the vehicle battery power supply being in a state of not being under voltage or power off, determining whether the vehicle DVR meets a sleep condition, and if the vehicle DVR meets the sleep condition, the vehicle DVR enters a sleep mode;

[0014] S5, in response to the vehicle DVR entering the sleep mode, determining whether the exit sleep condition is met; if the vehicle DVR does not meet the sleep condition or the vehicle DVR meets the exit sleep condition, repeating step S1, starting the vehicle battery power supply to supply power to the vehicle DVR main power circuit; if the vehicle DVR does not meet the exit sleep condition, determining whether the vehicle DVR meets the normal shutdown condition; if so, the vehicle DVR executes shutdown protection and shuts down; otherwise, repeating step S5.

[0015] Preferably, step S3 specifically includes:

[0016] After starting the delayed shutdown timer, determine whether a battery module exists. If a battery module exists, determine whether the voltage of the battery module is lower than a first voltage threshold. If the voltage of the battery module is lower than the first voltage threshold, the vehicle DVR is forced to shut down. If the voltage of the battery module is not lower than the first voltage threshold, the battery module can provide power and the buck-boost module is cut off after the delayed shutdown time is reached, and the power supply of the SOC module and peripheral modules is turned off.

[0017] If there is no battery module, it is determined whether the voltage of the supercapacitor module is lower than the second voltage threshold. If the voltage of the supercapacitor module is lower than the second voltage threshold, the vehicle DVR is forced to shut down. If the voltage of the supercapacitor module is not lower than the second voltage threshold, the supercapacitor module can provide power and the buck-boost module is enabled after the delayed shutdown time is reached, and the power supply to the SOC module and peripheral modules is turned off.

[0018] Preferably, between steps S1 and S2, the following steps are further included:

[0019] The status of the ACC, vehicle battery power supply, supercapacitor module and battery module are sent to the SOC module at intervals. When the vehicle battery power supply is in undervoltage or power-off state, the power switching module will switch to the battery module or supercapacitor module to provide power.

[0020] Preferably, step S2 specifically includes:

[0021] Determine whether the vehicle battery power supply is in an undervoltage or power-off state. If the vehicle battery power supply is in an undervoltage or power-off state, start the undervoltage or power-off timing, and determine whether the undervoltage or power-off time of the vehicle battery power supply exceeds the time threshold. If so, generate an undervoltage or power-off warning signal and send it to the SOC module, and enter the delayed shutdown state; if the vehicle battery power supply is not in an undervoltage or power-off state, or the undervoltage or power-off time of the vehicle battery power supply does not exceed the time threshold, reset the undervoltage or power-off timing, and repeat step S1.

[0022] As an option, it also includes:

[0023] In response to the vehicle-mounted battery power source being in a normal power supply state, the output voltage of the buck-boost module is controlled to charge the supercapacitor module and / or the battery module.

[0024] In a second aspect, an embodiment of the present application provides a vehicle-mounted DVR main power circuit control device, wherein the vehicle-mounted DVR main power circuit includes a power on / off control module, a buck-boost module, a backup power module, and a power switching module. The backup power module includes a supercapacitor module and / or a lithium battery module. The power on / off control module is connected to the buck-boost module. The buck-boost module is used to convert the voltage of the vehicle battery power supply. The buck-boost module and the backup power module are respectively connected to the power switching module. The power switching module is used to switch the buck-boost module and the backup power module to power the SOC module and the peripheral modules according to the voltage provided by the buck-boost module and the backup power module, including:

[0025] The status detection module is configured to obtain the detected status of the ACC, the vehicle battery power supply, the super capacitor module and / or the battery module when the vehicle DVR is normally powered on and running;

[0026] A delayed shutdown starting module is configured to enter a delayed shutdown state and start a delayed shutdown timer in response to the vehicle battery power supply being in an undervoltage or power-off state and the undervoltage or power-off time exceeding a time threshold;

[0027] The delayed shutdown module is configured to execute forced shutdown in response to the voltage of the battery module or supercapacitor module being lower than the corresponding threshold voltage. In response to the voltage of the battery module or supercapacitor module being not lower than the corresponding threshold voltage, the battery module or supercapacitor module provides power and cuts off the buck-boost module after the delayed shutdown time is reached. The vehicle DVR executes shutdown protection and then shuts down.

[0028] In a third aspect, an embodiment of the present application provides an electronic device comprising one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors implement the method described in any implementation manner in the first aspect.

[0029] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any implementation manner in the first aspect.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The vehicle-mounted DVR main power supply circuit control method proposed in the present invention adopts a step-up / step-down module to convert the power supply voltage supplied by the vehicle-mounted battery power supply, and integrates a supercapacitor module, a battery module and a corresponding charging circuit. Under the control strategy of this method, when the voltage of the vehicle-mounted battery power supply is subject to pulse interference fluctuations or power failure, a backup power supply function can be provided to ensure that the equipment meets the corresponding requirements at a relatively low cost.

[0032] (2) The vehicle-mounted DVR main power supply circuit control method proposed in the present invention can fully meet the requirements of IOS7637, ISO16750, and GB19056 standards, as well as the actual use requirements for the vehicle-mounted DVR to work within a certain period of time after the vehicle's onboard battery power is cut off. It can also meet the requirements of trucks and heavy-duty trucks for the operating time of the equipment after power failure.

[0033] (3) The vehicle-mounted DVR main power circuit control method proposed in the present invention is logically reliable, and all the hardware used is integrated into the vehicle-mounted DVR main power circuit, eliminating the need for an external backup power supply, thus avoiding problems such as occupying space and untimely connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 1 is a hardware connection diagram of a vehicle-mounted DVR main power supply circuit control method according to an embodiment of the present application;

[0036] Figure 2 A schematic diagram of charging connection of a vehicle-mounted DVR main power supply circuit control method according to an embodiment of the present invention;

[0037] Figure 3 1 is a flow chart of a method for controlling a main power supply circuit of a vehicle-mounted DVR according to an embodiment of the present invention;

[0038] Figure 4 This is a logic block diagram of a vehicle-mounted DVR main power supply circuit control method according to an embodiment of the present invention;

[0039] Figure 5 A detailed diagram of part A in the logic block diagram of the vehicle-mounted DVR main power supply circuit control method according to an embodiment of the present invention;

[0040] Figure 6 Schematic diagram of a vehicle-mounted DVR main power circuit control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0042] refer to Figure 1 and Figure 2 The vehicle-mounted DVR's main power supply circuit includes a power-on / off control module 1, a buck-boost module 2, a backup power module, and a power switching module 3. The backup power module includes a supercapacitor module 41 and / or a battery module 42. The power-on / off control module 1 is connected to the buck-boost module 2, which converts the voltage of the vehicle-mounted battery power supply 7. The buck-boost module 2 and the backup power module are each connected to the power switching module 3. The power switching module 3 switches between the buck-boost module 2 and the backup power module to power the SOC module 5 and the peripheral modules 6 based on the voltage provided by the buck-boost module 2 and the backup power module. DC_IN (including the positive DC+, negative DC-, and control ACC) is input from the vehicle-mounted battery power supply 7 to the buck-boost module 2. The buck-boost module 2 is controlled by the power-on / off control module 1 (primarily controlled by the ACC during the first power-up). The buck-boost module 2 outputs 12.5V, which is used to charge the supercapacitor module 41 and / or the battery module 42 and to power the SOC module 5 and the peripheral modules 6. When the voltage of the vehicle-mounted battery power supply 7 fluctuates or is powered off, the supercapacitor module 41 or the battery module 42 supplies power to the SOC module 5 and the peripheral module 6. The vehicle-mounted DVR main power supply circuit control method of the embodiment of the present application is executed by the MCU module 8, and the vehicle-mounted battery power supply 7 can supply power to the MCU module 8 after passing through the buck-boost module 2 and then the power switching module 3. It should be noted that the power on / off control module 1, the buck-boost module 2, the MCU module 8, the backup power supply module and the power switching module 3 are all in the vehicle-mounted DVR main power supply circuit, that is, they are already built into the vehicle-mounted DVR, and are not powered externally by the backup power supply module and the vehicle-mounted DVR. Compared with an external backup power supply, the control method of the embodiment of the present application is lower in cost and has a good effect.

[0043] refer to Figure 2 The functions of each module in the vehicle DVR main power circuit are as follows:

[0044] The function of the power on / off control module 1 is as follows: when the vehicle battery power supply 7 is powered on for the first time, it is equivalent to DC+ power on, ACC changes from low level to high level, and MAIN_POWER_EN changes to high level to control the buck-boost module 2 to start working. At this time, the buck-boost module 2 is enabled and the MCU module 8 is powered on. The MCU module 8 pulls up MCU_MP_EN to start controlling the entire power system. In the subsequent power-on process of the vehicle battery power supply 7, the buck-boost module 2 is in the enabled state. The voltage converted by the buck-boost module 2 can convert the voltage of the vehicle battery power supply 7 under the control of the MCU module 8, and then power the SOC module 5 and the peripheral module 6.

[0045] Specifically, the buck-boost module 2 uses an LM5118 buck-boost converter, which can convert the 9-36V voltage supplied by the vehicle battery power supply 7 into a VCC_12V (12.5V) voltage when the enable terminal is at a high level.

[0046] Specifically, the supercapacitor module 41 may be four supercapacitors connected in series, and the output voltage VCC_12V of the buck-boost module 2 charges the four supercapacitors connected in series to VCC_SC under the control of a constant current IC.

[0047] Specifically, the battery module 42 can be a dual-cell lithium battery, which is charged by the vehicle-mounted battery power supply 7, and the discharge of the lithium battery is also controlled by the MCU module 8, which can minimize the self-discharge loss of the lithium battery when the device is not working.

[0048] The power switching module 3 is composed of three Schottky diodes connected to the buck-boost module 2, the supercapacitor module 41 and the battery module 42 respectively. According to the comparison of the output voltage of the buck-boost module 2, the voltage of the supercapacitor module 41 and the voltage of the battery module 42, the Schottky diode of the module with the larger voltage is turned on to provide the VDD voltage. The VDD voltage is then converted by the power supply to provide a suitable power supply voltage to power the SOC module 5 and the peripheral module 6. Specifically, after the device is powered on normally, the MCU module 8 enables the charging function of the supercapacitor module 41 and the battery module 42. If the vehicle battery power supply 7 is powered off and the voltage of the supercapacitor module 41 is lower than the voltage of the battery module 42, the battery module 42 discharges. If the vehicle battery power supply 7 is undervoltage or powered off and the voltage of the supercapacitor module 41 is higher than the voltage of the battery module 42, the supercapacitor module 41 discharges. When the device is shut down, the MCU module 8 will cut off the connection between the battery module 42 and the circuit to prevent battery leakage.

[0049] In a specific embodiment, when the vehicle-mounted battery power supply 7 is powered on for the first time, the initial power-on condition of the buck-boost module 2 is met, that is, the ACC generated when the vehicle-mounted battery power supply 7 is powered on for the first time is high, then the ACC received by the buck-boost module 2 is at a high level and the buck-boost module 2 is turned on; in the subsequent power-on process, the vehicle-mounted battery power supply 7 supplies power to the MCU module 8, and the MCU module 8 controls the buck-boost module 2. The peripheral control pins of the MCU module 8 are initialized, and the power on / off control module 1 controls MCN_MP_EN to a high level, so that the enable signal MAIN_POWER_EN of the buck-boost module 2 is at a high level and the buck-boost module 2 is continuously turned on. The buck-boost module 2 converts the voltage of the vehicle-mounted battery power supply 7 so that the vehicle-mounted battery power supply 7 continuously and stably provides power to the buck-boost module 2, and the output voltage of the buck-boost module 2 can meet the power supply requirements of the SOC module 5 and the peripheral module 6.

[0050] Figure 3A method for controlling a vehicle-mounted DVR main power supply circuit according to an embodiment of the present application is shown, comprising the following steps:

[0051] S0, determine whether the startup conditions of the vehicle DVR are met. If so, the vehicle DVR is started normally, and the vehicle battery power supply 7 is started to supply power to the main power circuit of the vehicle DVR. Otherwise, determine whether ACC is at a high level. If so, it is in standby state and repeats this step. Otherwise, the vehicle DVR is directly shut down.

[0052] In a specific embodiment, the startup conditions of the vehicle DVR are determined according to specific needs, including ambient temperature, unlocking status, etc. When the startup conditions are met, the vehicle DVR will start and run normally, and during the operation, the power supply status of the vehicle DVR main power circuit is monitored and controlled. The overall process is as follows Figure 4 shown.

[0053] S1, when the vehicle DVR is normally powered on and running, the detected status of the ACC, the vehicle battery power supply 7, the super capacitor module 41 and / or the battery module 42 is obtained.

[0054] In a specific embodiment, between steps S1 and S2, the following steps are also included:

[0055] The status of the ACC, onboard battery power supply 7, supercapacitor module 41, and battery module 42 are transmitted to the SOC module 5 at intervals. Specifically, the interval is T1. The ACC status can be low or high. The status of the onboard battery power supply 7 can be normal power supply, undervoltage, or power-off. The status of the supercapacitor module 41 includes the voltage level of the supercapacitor module 41. The status of the battery module 42 includes whether the battery module 42 is present and the voltage level of the battery module 42. When the onboard battery power supply 7 is undervoltage or power-off, and the voltage of the onboard battery power supply 7 is lower than the lower operating limit of the buck-boost module 2, the power switching module 3 will switch power supply to the battery module 42 or the supercapacitor module 41.

[0056] S2, in response to the vehicle battery power source 7 being in an undervoltage or power-off state and the undervoltage or power-off time exceeding a time threshold, entering a delayed shutdown state and starting a delayed shutdown timer.

[0057] In a specific embodiment, it is determined whether the vehicle battery power supply 7 is in an undervoltage or power-off state. If the vehicle battery power supply 7 is in an undervoltage or power-off state, the undervoltage or power-off timing is started, and it is determined whether the undervoltage or power-off time of the vehicle battery power supply 7 exceeds the time threshold. If so, an undervoltage or power-off warning signal is generated and sent to the SOC module 5, and the system enters a delayed shutdown state. If the vehicle battery power supply 7 is not in an undervoltage or power-off state, or the undervoltage or power-off time of the vehicle battery power supply 7 does not exceed the time threshold, the undervoltage or power-off timing is reset, and step S1 is repeated.

[0058] Specifically, the time threshold is T2, which is determined based on the duration of the pulse interference. Generally, the time threshold T2 is slightly larger than the interference pulse width. For example, under the 7637 standard, the duration of the P1 negative interference pulse is 200ms, and the width of the 16750-2 disturbance interference pulse is on the order of 10 seconds. The time threshold T2 will be larger than these times and leave a time margin. When the main power supply voltage is detected to be undervoltage or power failure, T2 timing begins. Taking into account the detection time error and functional reliability, T2 needs to be larger than the duration of different interferences by a margin ΔT. According to the standard requirements and the actual test conditions of the equipment, ΔT is equal to the time required for the undervoltage state specified in the standard to recover to the normal working voltage. By judging that the vehicle-mounted battery power supply 7 is in an undervoltage or power-off state and the undervoltage or power-off time exceeds the time threshold T2, it is possible to effectively judge whether the vehicle-mounted battery power supply 7 can provide stable power supply to the SOC module 5 and the peripheral module 6. Within the time threshold T2, the vehicle-mounted battery power supply 7 is in an undervoltage or power-off state, and power is provided by the battery module 42 or the supercapacitor module 41, so as to avoid the vehicle-mounted battery power supply 7 being subject to pulse interference and unable to provide stable power supply to the SOC module 5 and the peripheral module 6. If the vehicle-mounted battery power supply 7 still cannot provide stable power supply to the SOC module 5 and the peripheral module 6 after exceeding the time threshold T2, it enters the delayed shutdown state, and after the delayed shutdown time is reached, the buck-boost module 2 is enabled and the power supply to the SOC module 5 and the peripheral module 6 is turned off. When the vehicle-mounted battery power supply 7 is in an undervoltage or power-off state, the buck-boost module 2 cannot provide a suitable voltage to the power switching module 3. The power switching module 3 can then select the supercapacitor module 41 or the battery module 42 according to the voltage of the supercapacitor module 41 or the battery module 42 to power the SOC module 5 and the peripheral module 6, without affecting the short-term normal use and normal shutdown of the vehicle-mounted DVR. At the same time, after receiving the undervoltage or power-off warning signal, the SOC module 5 can report the information to the background server and save the data of the vehicle-mounted DVR in time to avoid data loss or hardware damage and extend the service life of the device. When the vehicle-mounted battery power supply 7 is in an undervoltage or power-off state, and the undervoltage or power-off time does not exceed the time threshold, it will not be affected by pulse interference at this time, and the status bit is still normal, indicating that the vehicle-mounted battery power supply 7 can supply power normally at this time.

[0059] S3, in response to the voltage of the battery module 42 or the supercapacitor module 41 being lower than the corresponding threshold voltage, the vehicle DVR performs a forced shutdown. In response to the voltage of the battery module 42 or the supercapacitor module 41 not being lower than the corresponding threshold voltage, the battery module 42 or the supercapacitor module 41 provides power and cuts off the buck-boost module 2 after the delayed shutdown time is reached. The vehicle DVR performs shutdown protection and then shuts down.

[0060] In a specific embodiment, reference Figure 5 , step S3 specifically includes:

[0061] After the delayed shutdown timer is started, it is determined whether the battery module 42 exists. If the battery module 42 exists, it is determined whether the voltage of the battery module 42 is lower than the first voltage threshold. If the voltage of the battery module 42 is lower than the first voltage threshold, the vehicle-mounted DVR is forced to shut down. If the voltage of the battery module 42 is not lower than the first voltage threshold, the battery module 42 can provide power and the buck-boost module 2 is cut off after the delayed shutdown time is reached, and the power supply of the SOC module and the peripheral modules is turned off;

[0062] If the battery module 42 does not exist, it is determined whether the voltage of the supercapacitor module 41 is lower than the second voltage threshold. If the voltage of the supercapacitor module 41 is lower than the second voltage threshold, the vehicle-mounted DVR is forced to shut down. If the voltage of the supercapacitor module 41 is not lower than the second voltage threshold, the supercapacitor module 41 can provide power and cut off the buck-boost module 2 after the delayed shutdown time is reached, and turn off the power supply to the SOC module and peripheral modules.

[0063] Specifically, when the vehicle battery power supply 7 is in an undervoltage or power-off state and meets the undervoltage or power-off shutdown conditions, the delayed shutdown is started at this time, the status bit is in the delayed shutdown status bit, the delayed shutdown timing is started, and it is determined whether there is a battery module 42. If there is a battery module 42, it is determined whether the voltage of the battery module 42 is lower than the first voltage threshold. If the voltage of the battery module 42 is not lower than the first voltage threshold, it means that the battery module 42 can provide stable power to the SOC module 5 and the peripheral module 6, and can meet the requirements of delayed shutdown, and cut off the buck-boost module 2 after the delayed shutdown time is reached; if there is no battery module 42, it is determined whether the voltage of the supercapacitor module 41 is lower than the second voltage threshold. If the voltage of the supercapacitor module 41 is not lower than the second voltage threshold, it means that the supercapacitor module 41 can provide stable power to the SOC module 5 and the peripheral module 6, and can meet the requirements of delayed shutdown, and cut off the buck-boost module 2 after the delayed shutdown time is reached, and turn off the power supply to the SOC module 5 and the peripheral module 6. Specifically, the first voltage threshold is V bat -S, the first voltage threshold is V sc-S, determined according to specific design requirements. The final power switching module 3 determines whether the battery module 42 or the supercapacitor module 41 provides stable power to the SOC module 5 and the peripheral module 6 based on the voltage of the battery module 42 and the supercapacitor module 41. When the delayed shutdown time is reached, the buck-boost module 2 is enabled and the power supply to the SOC module 5 and the peripheral module 6 is turned off. The discharge switch of the battery module 42 is cut off to reduce battery leakage loss. The MCU module 8 is powered by the remaining voltage on the supercapacitor module 41 and is powered off after the voltage is lower than the power supply threshold of the MCU module 8. The battery module 42 provides power to the SOC module 5 and the peripheral module 6 for a longer time, but is limited by the capacity and volume of the battery module 42. The supercapacitor module 41 can provide instantaneous power to the SOC module 5 and the peripheral module 6, but the discharge amount can be expanded according to the supercapacitors in series. The two can be used in conjunction to provide stable power to the SOC module 5 and the peripheral module 6, so that they meet the delayed shutdown time and facilitate data preservation and hardware protection. When the voltage of the battery module 42 is lower than the first voltage threshold or the voltage of the supercapacitor module 41 is lower than the second voltage threshold, the vehicle-mounted DVR is forced to shut down. Forced shutdown refers to the shutdown action taken if the voltage of the battery module 42 or the voltage of the supercapacitor module 41 is lower than a certain corresponding voltage threshold during the delayed shutdown process. It can be considered a type of delayed shutdown. If the battery voltage or the supercapacitor voltage is above the voltage threshold within the delay setting time, then forced shutdown will not occur. Under normal circumstances, the capacitance on the supercapacitor module 41 is about 2V greater than the voltage of the battery module 42. For the vehicle-mounted device that encounters more frequent transient interference, the vehicle-mounted battery power supply 7 is undervoltage or power outage (time is about seconds), and the supercapacitor module 41 discharges and compensates to supply power to the back-end circuit. At this time, the battery module 42 does not discharge, giving full play to the characteristics of the supercapacitor module 41 that the charging and discharging time is fast and the number of charging and discharging times can be far greater than that of the battery module 42. The battery module 42 only performs discharge compensation when the vehicle-mounted battery power supply 7 is undervoltage or power outage for a period longer than the discharge capacity of the supercapacitor module 41.

[0064] In a specific embodiment, it also includes:

[0065] S4, in response to the vehicle battery power supply 7 not being in an undervoltage or power-off state, determining whether the vehicle DVR meets the vehicle DVR entering sleep condition, and if the vehicle DVR meets the vehicle DVR entering sleep condition, the vehicle DVR enters sleep mode;

[0066] S5, in response to the vehicle DVR entering the sleep mode, determining whether the vehicle DVR meets the sleep exit condition. If the vehicle DVR does not meet the sleep entry condition or the vehicle DVR meets the sleep exit condition, the vehicle DVR repeats step S1, starts the vehicle battery power supply 7 to supply power to the vehicle DVR main power circuit. If the vehicle DVR does not meet the sleep exit condition, determining whether the vehicle DVR meets the normal shutdown condition. If so, the vehicle DVR executes shutdown protection and shuts down. Otherwise, repeating step S5.

[0067] Specifically, when the vehicle-mounted battery power supply 7 is not in an undervoltage or power-off state, it indicates that the vehicle-mounted battery power supply 7 can supply power normally. It is determined whether the vehicle-mounted DVR meets the sleep condition. If the vehicle-mounted DVR meets the sleep condition, it enters the sleep mode. If the vehicle-mounted DVR does not meet the sleep condition or the vehicle-mounted DVR meets the exit sleep condition, the vehicle-mounted DVR is started normally, the vehicle-mounted battery power supply 7 is started to supply power to the vehicle-mounted DVR main power circuit, and steps S1-S4 are repeated.

[0068] If the vehicle-mounted DVR does not meet the exit sleep condition, it is determined whether the vehicle-mounted DVR meets the normal shutdown condition. If so, the vehicle-mounted DVR performs shutdown protection and then shuts down. Otherwise, step S5 is repeated.

[0069] In a specific embodiment, it also includes:

[0070] In response to the vehicle-mounted battery power source 7 being in a normal power supply state, the output voltage of the buck-boost module 2 is controlled to charge the supercapacitor module 41 and / or the battery module 42 .

[0071] Specifically, when the vehicle-mounted battery power supply 7 is in a normal power supply state, the output voltage of the buck-boost module 2 can also be controlled to charge the supercapacitor module 41 and / or the battery module 42, so that the voltage of the supercapacitor module 41 and the battery module 42 can meet the subsequent power supply requirements for the SOC module 5 and the peripheral module 6.

[0072] Further references Figure 6 As an implementation of the methods shown in the above figures, the present application provides an embodiment of a vehicle-mounted DVR main power circuit control device, which is similar to Figure 3 Corresponding to the method embodiment shown, the device can be specifically applied to various electronic devices.

[0073] The embodiment of the present application provides a vehicle-mounted DVR main power circuit control device, wherein the vehicle-mounted DVR main power circuit includes a power on / off control module 1, a buck-boost module 2, a backup power module, and a power switching module 3. The backup power module includes a supercapacitor module 41 and / or a lithium battery module 42. The power on / off control module 1 is connected to the buck-boost module 2. The buck-boost module 2 is used to convert the voltage of the vehicle-mounted battery power 7. The buck-boost module 2 and the backup power module are respectively connected to the power switching module 3. The power switching module 3 is used to switch the buck-boost module 2 and the backup power module according to the voltage provided by the buck-boost module 2 and the backup power module to power the SOC module 5 and the peripheral module 6, including:

[0074] The status detection module 10 is configured to obtain the detected status of the ACC, the vehicle battery power supply 7, the super capacitor module 41 and / or the battery module 42 when the vehicle DVR is normally powered on and running;

[0075] The delayed shutdown starting module 20 is configured to enter the delayed shutdown state and start the delayed shutdown timer in response to the vehicle battery power supply 7 being in an undervoltage or power-off state and the undervoltage or power-off time exceeding a time threshold;

[0076] The delayed shutdown module 30 is configured to execute a forced shutdown in response to the voltage of the battery module 42 or the supercapacitor module 41 being lower than the corresponding threshold voltage. In response to the voltage of the battery module 42 or the supercapacitor module 41 not being lower than the corresponding threshold voltage, the battery module 42 or the supercapacitor module 41 provides power and cuts off the buck-boost module 2 after the delayed shutdown time is reached. The vehicle DVR executes shutdown protection and then shuts down.

[0077] It should be noted that the computer-readable medium described in this application may be a computer-readable signal medium or a computer-readable medium, or any combination of the two. Computer-readable media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor devices, apparatuses, or components, or any combination thereof. More specific examples of computer-readable media may include, but are not limited to, an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this application, a computer-readable medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution device, apparatus, or component. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution apparatus, device, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wireline, optical cable, RF, or any suitable combination thereof.

[0078] Computer program code for performing the operations of the present application can be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0079] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the devices, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0080] The modules involved in the embodiments described in this application may be implemented in software or hardware, and may also be set in a processor.

[0081] As another aspect, the present application further provides a computer-readable medium, which may be included in the electronic device described in the above embodiments, or may exist independently without being incorporated into the electronic device. The computer-readable medium carries one or more programs.

[0082] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A method for controlling the main power circuit of a vehicle-mounted DVR, characterized in that: The vehicle-mounted DVR main power supply circuit includes a power on / off control module, a buck-boost module, a backup power supply module, and a power switching module. The backup power supply module includes a supercapacitor module and a battery module. The power on / off control module is connected to the buck-boost module. The buck-boost module is used to convert the voltage of the vehicle-mounted battery power supply. The buck-boost module and the backup power supply module are respectively connected to the power switching module. The power switching module is used to switch the buck-boost module and the backup power supply module to power the SOC module and the peripheral modules according to the voltage provided by the buck-boost module and the backup power supply module. The circuit includes the following steps: S1, when the vehicle DVR is normally powered on and running, the detected status of the ACC, vehicle battery power supply, super capacitor module and battery module are obtained at preset time intervals; S2, determining whether the vehicle-mounted battery power supply is in an undervoltage or power-off state. If the vehicle-mounted battery power supply is in an undervoltage or power-off state, starting the undervoltage or power-off timing, and determining whether the undervoltage or power-off time of the vehicle-mounted battery power supply exceeds a time threshold. If so, generating an undervoltage or power-off warning signal and sending it to the SOC module, entering a delayed shutdown state, and starting the delayed shutdown timing, wherein the time threshold is greater than the pulse interference duration specified in the vehicle-mounted equipment power supply interference standard. When the vehicle-mounted battery power supply is in an undervoltage or power-off state, the power switching module preferentially switches to the supercapacitor module for power supply, and switches to the battery module for power supply only when the supercapacitor module has insufficient discharge capacity. If the vehicle-mounted battery power supply is not in an undervoltage or power-off state, or the undervoltage or power-off time of the vehicle-mounted battery power supply does not exceed the time threshold, the undervoltage or power-off timing is reset, and step S1 is repeated. S3, in response to the voltage of the battery module or supercapacitor module being lower than the corresponding threshold voltage, the vehicle DVR performs a forced shutdown; in response to the voltage of the battery module or supercapacitor module not being lower than the corresponding threshold voltage, the battery module or supercapacitor module provides power and disconnects the buck-boost module after the delayed shutdown time is reached, and the vehicle DVR performs shutdown protection and shuts down; The voltage of the supercapacitor module is greater than the voltage of the battery module, and the buck-boost module charges the supercapacitor module and the battery module when the on-board battery power supply is in a normal power supply state.

2. The vehicle-mounted DVR main power circuit control method according to claim 1, characterized in that: Before step S1, the following steps are also included: Determine whether the startup conditions of the vehicle DVR are met. If so, the vehicle DVR is started normally, and the vehicle battery power is started to supply power to the main power circuit of the vehicle DVR. Otherwise, determine whether ACC is at a high level. If so, it is in a standby state and repeats this step. Otherwise, the vehicle DVR is directly shut down.

3. The vehicle-mounted DVR main power circuit control method according to claim 1, characterized in that: When the ACC signal generated by the vehicle battery power supply is powered on for the first time and is high, or when the ACC signal generated by the power on / off control module is controlled to be high during a subsequent power-on process, the ACC signal received by the buck-boost module is at a high level and the buck-boost module is enabled. The buck-boost module is used to convert the voltage of the vehicle battery power supply.

4. The vehicle-mounted DVR main power circuit control method according to claim 1, characterized in that: Also includes: S4, in response to the vehicle battery power supply being in a non-undervoltage or power-off state, determining whether the vehicle DVR meets a sleep condition, and if the vehicle DVR meets the sleep condition, the vehicle DVR enters a sleep mode; S5, in response to the vehicle DVR entering the sleep mode, determining whether the exit sleep condition is met; if the vehicle DVR does not meet the sleep condition or the vehicle DVR meets the exit sleep condition, repeating step S1, starting the vehicle battery power supply to supply power to the vehicle DVR main power circuit; if the vehicle DVR does not meet the exit sleep condition, determining whether the vehicle DVR meets the normal shutdown condition; if so, the vehicle DVR executes shutdown protection and shuts down; otherwise, repeating step S5.

5. The vehicle-mounted DVR main power circuit control method according to claim 1, characterized in that: The step S3 specifically includes: After starting the delayed shutdown timing, it is determined whether the battery module exists. If the battery module exists, it is determined whether the voltage of the battery module is lower than the first voltage threshold. If the voltage of the battery module is lower than the first voltage threshold, the vehicle-mounted DVR is forced to shut down. If the voltage of the battery module is not lower than the first voltage threshold, the battery module can provide power and the buck-boost module is cut off after the delayed shutdown time is reached, and the power supply of the SOC module and the peripheral modules is turned off; If the battery module does not exist, it is determined whether the voltage of the supercapacitor module is lower than the second voltage threshold. If the voltage of the supercapacitor module is lower than the second voltage threshold, the vehicle-mounted DVR is forced to shut down. If the voltage of the supercapacitor module is not lower than the second voltage threshold, the supercapacitor module can provide power and the buck-boost module is enabled after the delayed shutdown time is reached, and the power supply to the SOC module and the peripheral modules is turned off.

6. A vehicle-mounted DVR main power circuit control device, characterized in that: The vehicle-mounted DVR main power supply circuit includes a power on / off control module, a buck-boost module, a backup power supply module, and a power switching module. The backup power supply module includes a supercapacitor module and a lithium battery module. The power on / off control module is connected to the buck-boost module. The buck-boost module is used to convert the voltage of the vehicle-mounted battery power supply. The buck-boost module and the backup power supply module are respectively connected to the power switching module. The power switching module is used to switch the buck-boost module and the backup power supply module to power the SOC module and peripheral modules according to the voltage provided by the buck-boost module and the backup power supply module, including: A status detection module is configured to obtain the detected status of the ACC, the vehicle battery power supply, the super capacitor module and the battery module when the vehicle DVR is normally powered on and running; The delayed shutdown starting module is configured to determine whether the vehicle battery power supply is in an undervoltage or power-off state. If the vehicle battery power supply is in an undervoltage or power-off state, the undervoltage or power-off timing is started, and it is determined whether the undervoltage or power-off time of the vehicle battery power supply exceeds a time threshold. If so, an undervoltage or power-off warning signal is generated and sent to the SOC module, and the delayed shutdown state is entered and the delayed shutdown timing is started, wherein the time threshold is greater than the pulse interference duration specified in the vehicle equipment power interference standard. When the vehicle battery power supply is in an undervoltage or power-off state, the power switching module preferentially switches to the supercapacitor module for power supply, and switches to the battery module for power supply only when the discharge capacity of the supercapacitor module is insufficient. If the vehicle battery power supply is not in an undervoltage or power-off state, or the undervoltage or power-off time of the vehicle battery power supply does not exceed the time threshold, the undervoltage or power-off timing is reset. a delayed shutdown module configured to, in response to the voltage of the battery module or supercapacitor module being lower than a corresponding threshold voltage, force the vehicle DVR to shut down; and, in response to the voltage of the battery module or supercapacitor module not being lower than a corresponding threshold voltage, provide power to the battery module or supercapacitor module and cut off the buck-boost module after the delayed shutdown time is reached, so that the vehicle DVR executes shutdown protection and shuts down; The voltage of the supercapacitor module is greater than the voltage of the battery module, and the buck-boost module charges the supercapacitor module and the battery module when the on-board battery power supply is in a normal power supply state.

7. An electronic device comprising: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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