Method and device for power management and deadlock protective control of vehicle-mounted positioning and tracking equipment

Abstract

The invention relates to a method and a device for the power management and deadlock protective control of vehicle-mounted positioning and tracking equipment. The device comprises the MCU, a first comparator, a second comparator, a first voltage sampling circuit, a power pre-stage protection circuit, the DC-DC circuit, a charging management circuit, an internal battery, a second voltage sampling circuit, a first LDO, a second LDO, and a third LDO, wherein the first comparator detects whether a vehicle power supply sampling voltage out of vehicle-mounted devices is less than an MCU power supply voltage, and judges whether a duration time of the vehicle power supply sampling voltage out of vehicle-mounted devices less than an MCU power supply voltage reaches a preset time, the second comparator judges whether an interior lithium battery power supply sampling voltage is less than the MCU power supply voltage, and judges whether the duration time of the of the interior lithium battery power supply sampling less than the MCU power supply voltage reaches the preset time. Compared with the prior art, the method and the device have the advantages of clear structure, capability of programming watchdog time, suitability for slow start circuits, automatic switch of the internal battery and an external battery, prolongation in depletion time of the internal battery.

Description

technical field [0001] The invention relates to a vehicle-mounted positioning and tracking device, in particular to a method and device for power management and anti-crash control of the vehicle-mounted positioning and tracking device. Background technique [0002] Vehicle positioning and tracking service terminal products usually use GPS technology, communication technologies such as GSM, CDMA, 3G, etc., and microprocessors (MCU, ARM7, ARM9, etc.). The basic functions of the main products are equivalent, including vehicle positioning, anti-theft and anti-robbery alarms , Vehicle oil and power cut off, display scheduling information and other functions. [0003] The current technical status of the product is as follows: [0004] 1) Generally, the overall structure of electrical appliances is power supply, GPS module, GSM, microprocessor, general IO, analog input, etc.; [0005] 2) The corresponding DC-DC circuit is used, and the vehicle power supply is 9V to 36V [0006] ...

AI Technical Summary

Problems solved by technology

[0010] 1) If the CPU of the communication module is the CPU of the application program when the vehicle positioning tracking service terminal product uses the CPU, if the application program crashes, because the communication module takes a long time to start, if the application program cannot feed the hardware watchdog in time, the communication module It will be reset frequently by the hardware watchdog, which will cause the terminal to fail to boot;

[0011] 2) The action time of the watchdog cannot be controlled by software;

[0012] 3) The lack of internal battery management of the terminal equipment, the problem that the communication module cannot automatically start when the external power supply is restored after the module is automatically shut down when the battery is exhausted, if there is no human intervention

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