The invention provides a standby power system of a vehicle-mounted terminal, which specifically comprises a main power supply, a standby battery, a standby power management circuit, a main and standby power switching circuit and an MCU (Microprogrammed Control Unit), wherein the main power supply and the standby battery are connected with the main and standby power switching circuit, and the MCU is connected with the main and standby power switching circuit and the standby power management circuit; the standby power management circuit is connected with a standby battery; after the main power supply is powered off, the main and standby power switching circuit controls to take power from the standby battery, the standby battery maintains system power supply until the voltage is lower than an under-voltage set value 3V, a comparator in the standby power management circuit outputs a standby battery closing signal, and the standby battery stops power supply; the invention provides a combined circuit for low-voltage turn-off and on-off control of a standby battery, and the combined circuit has the characteristics that the main control chip can control the turn-off of the standby battery, the reset of the main control chip does not affect the power supply of the standby battery, and the low-voltage turn-off of the standby battery is prevented from being turned into no-load turn-on again from on-load turn-off.
本发明提供一种车载终端的备电系统,具体包括:一种车载终端的备电系统,包括:主电源、备用电池、备电管理电路、主备电切换电路以及MCU;其中主电源、备用电池连接主备电切换电路,MCU连接主备电切换电路和备电管理电路;备电管理电路连接备用电池;主电源断电后,主备电切换电路控制从备用电池取电,备用电池维持系统供电,直至电压低于欠压设定值3V后,备电管理电路中的比较器输出关闭备用电池信号,备用电池停止供电;本发明提供了一种备用电池低压关断与通断控制的组合电路,具备主控芯片可控制备用电池关闭、主控芯片复位不影响备用电池供电,以及防止备用电池低压关断由带载转为空载再次开启的特性。
Standby power system of vehicle-mounted terminal
一种车载终端的备电系统
2024-06-18
Patent
Electronic Resource
Chinese
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
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