CAR STARTER WHICH WORKS UNDER VERY LOW TEMPERATURE AND A PROTECTION CIRCUIT THEREOF

摘要

A car starter able to work under very low temperature and a protection circuit thereof, include primarily a positive electrode output end, a negative electrode output end, an MCU single-chip microcomputer, a starter, a power heating circuit, and a MOS tube control circuit. The positive electrode of the starter is connected respectively with the positive electrode output end and the power heating circuit. Two pins are drawn from the MCU single-chip microcomputer to connect respectively with one of two ends of the MOS tube control circuit, and another three pins are drawn from the MCU single-chip microcomputer to connect with the power heating circuit. The feature of the present invention is that an independent power heating circuit is designed to solve the problem that the batteries cannot be discharged at a large electric current under very low temperature and to heat up the batteries of the car starter quickly and safely under low temperature, allowing the batteries of the car starter to achieve a reasonable working temperature, and solving the issues of using the car starter under low temperature. Furthermore, starting a car involves the discharge at a very large electric current, thus the safety concern needs to be accounted for too. The present invention solves the difficulty in starting the car in a very low temperature of -40°C, and the power heating circuit can turn off outputs immediately when short-circuiting, which protects the circuits on the starter and the clamps and also solves the safety issues of using the car starter effectively.