A kind of 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, which is accompanied by a test of the low-voltage power supply capacity of electric vehicles, so electric vehicle DC-to-DC DC / DC low-voltage battery chargers The power of DC / DC low-voltage battery chargers for electric vehicles, which are widely used at present, can reach more than 200 amperes or even greater. This makes the output of DC / DC low-voltage battery chargers for electric vehicles prevent backflow Protection is getting harder and harder. Some products use the following methods: [0003] 1. Use power relays, controlled by software, defects: low reliability and large current relays are too large and costly; [0004] 2. Using power diodes, defect: too much loss; [0005...

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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