The invention provides a control circuit and a control method for startup and shutdown of a vehicle-mounted DVR, and the control circuit comprises an MCU, an SOC, an RTC circuit, a GPS positioning module, a wireless communication module, a Power ON/OFF circuit, a first step-down module, a CARACC module, an LDO conversion circuit, a second step-down module, a third step-down module, a fourth step-down module, and a fifth step-down module. And the first voltage reduction module is controlled by the Power ON/OFF circuit. A power ON/OFF circuit is adopted to control a first-stage power supply, the first-stage power supply supplies power to an MCU and an SOC system through a voltage reduction module and an LDO conversion circuit, after a CAR-ACC signal is disconnected and flames out, the MCU enters a sleep working mode, and the power ON/OFF circuit is controlled according to timing shutdown time set by an RTC circuit; therefore, the control of a normal power-on process, a self-locking power-on process, a restarting process and a shutdown process is realized.
本发明提供了一种车载DVR开关机的控制电路及控制方法,控制电路包括MCU、SOC、RTC电路、GPS定位模块、无线通讯模块、Power ON/OFF电路、第一降压模块、CAR_ACC模块、LDO转换电路、第二降压模块、第三降压模块、第四降压模块和第五降压模块,从车载蓄电池输入信号PWR_IN到第一降压模块,第一降压模块由所述Power ON/OFF电路进行控制。采用Power ON/OFF电路对一级电源进行控制,一级电源通过降压模块和LDO转换电路给MCU和SOC系统供电,当CAR‑ACC信号断开熄火后,MCU进入了休眠工作模式,通过RTC电路设定的定时关机时间对Power ON/OFF电路进行控制;从而实现正常上电过程、自锁上电过程、重启过程以及关机过程的控制。
Control circuit and control method for startup and shutdown of vehicle-mounted DVR (Digital Video Recorder)
一种车载DVR开关机的控制电路及控制方法
2024-10-18
Patent
Electronic Resource
Chinese
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
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