Double-battery circuit of law enforcement instrument

Abstract

The invention discloses a double-battery circuit of a law enforcement instrument. The circuit comprises an IC chip U101, the U101 is connected with a system power bus; the system power bus is connected in parallel with a backup battery and a main battery. A Schottky diode D401 and a Schottky diode D402 are connected in series between the backup battery and the connection node of the main battery and the system power supply bus; the positive electrode of the Schottky diode D401 is connected with an IC chip U101, the main battery is further connected with an IC chip U102, and the negative electrode of the Schottky diode D402 is connected with the IC chip U102. The design is simple, the cost is low, functions of a backup battery required by the technical requirement of the law enforcement instrument are met, system power supply is directly supplied by a main battery without passing through an MOS switch, extra MOS voltage drop cannot be generated, when the two batteries are charged, the two batteries are provided with independent charging ICs, and the problem that the batteries cannot be charged due to over-discharge is solved.

Description

technical field [0001] The invention relates to the technical field of public security law-enforcement instruments, and more specifically relates to a double-battery circuit of a law-enforcement instrument. Background technique [0002] At present, the public security law enforcement device needs to monitor and shoot the whole process of the scene during the law enforcement video recording process. When the battery suddenly runs out of power and replaces the battery during the law enforcement video recording process, the law enforcement video will be interrupted, so a backup battery is needed to maintain the law enforcement device for several seconds. Monitor shooting time. [0003] However, the existing technology usually uses a proprietary dual-battery control IC, such as Awinic’s dual-battery control chip AW3312, which configures the IC through an external proprietary GPIO to switch between the main battery and the backup battery. In this scheme, the main battery and the...

AI Technical Summary

Problems solved by technology

Although the proprietary dual-battery control IC can meet the requirements of switching to the backup battery to supply power to the system when the main battery is dead, there are several problems: 1. High BOM cost, complicated peripheral circuit design and implementation, and complicated software design process. Although the chip The function is powerful, but when the body enforcement instrument product only needs the main battery to change the battery, the system has a short-term uninterrupted power supply function, which wastes resources; 2. The main battery and backup battery are connected to the system for power supply through the MOS switch. When the current is large, the MOS The switch produces a voltage drop, which affects the system's judgment on the battery power

3. When charging the battery, because the chip adopts the mechanism of charging whoever supplies power to the system, when the main battery is low and over-discharged, there will be a problem that the main battery will not be charged but only the backup battery will be charged.

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