Charging protection circuit and automobile

Abstract

The present invention provides a charging protection circuit and an automobile. The charging protection circuit comprises a charging output end, a first switch element which comprises a first end, a second end and a control end, and a control circuit which is connected to the control end of the first switch element, wherein the first end and the second end of the first switch element are connected in series in a charging loop of the charging output end and a battery to be charged. In the embodiment of the invention, by setting the control circuit to output control voltage to the control end of the first switch element, the switch-on or switch-off of the first switch element is controlled, the current backward flowing of a charging circuit can be prevented, the battery is protected, the participation of software in control is not needed, the influences of external conditions such as temperature and current is zero, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a charging protection circuit and an automobile. Background technique [0002] With the continuous development of automotive electronics, more and more electronic functions are applied to electric vehicles, accompanied by the test of low-voltage power supply capabilities of electric vehicles, so DC to DC DC / DC low-voltage battery chargers for electric vehicles The power of the DC / DC low-voltage battery charger widely used at present can reach more than 200 amperes, or even greater, which makes the output of the DC / DC low-voltage battery charger for electric vehicles anti-backfeed Protection is getting harder and harder. Some products use the following methods: [0003] 1. Using power relays, controlled by software, defects: low reliability and high current relays are too bulky and costly; [0004] 2. Using power diodes, defect: too much loss; [0005] 3. Use power meta...

AI Technical Summary

Problems solved by technology

[0003] 1. Using power relays, controlled by software, defects: low reliability and high current relays are too bulky and costly;

[0004] 2. Using power diodes, defect: too much loss;

[0005] 3. Use power metal-oxide semiconductor field effect transistor mosfet, controlled by software, defect: affected by the accuracy of ADC (Analog-to-Digital Converter), the reliability is not high, and the response time is too slow

[0006] To sum up, the existing technical means cannot protect the battery well.

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