A voltage boost protection circuit

Abstract

The invention discloses a voltage boost protection circuit comprising a boost chip U1, a first switching tube Q1, a second switching tube Q2 and a short-circuit protection circuit T1. An input terminal of the boost chip U1 is connected with an external power supply VCC; an output enabling terminal of the boost chip U1 is connected with the external power supply VCC by an inductor L1; an output terminal of the boost chip U1 is connected with a first input terminal of the first switching tube Q1 by a first one-way conduction diode D1; an on-off control signal terminal of the boost chip U1 is connected with a first input terminal of the second switching tube Q2; a second input terminal of the first switching tube Q1 is connected with the first input terminal of the first switching tube Q1 by a first resistor R3,is respectively connected with a second input terminal of the second switching tube Q2 and a cathode of the short-circuit protection circuit T1 by a third resistor R4, and is also connected with a load; an output terminal of the first switching tube Q1 is connected with a feedback electrode of the short-circuit protection circuit T1; and an anode of the short-circuit protection circuit T1 is grounded. According to the invention, short-circuit protection of the boost circuit can be realized.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a voltage boost protection circuit. Background technique [0002] All kinds of batteries provide power supply for portable mobile products, and play an irreplaceable role in the circuit of the whole machine. In many cases, the output voltage value of the battery cannot meet the needs of the whole circuit, so the battery needs to be boosted, especially for the application of a single battery. In addition, when the battery is in use, short-circuit protection is very necessary. If there is no short-circuit protection, the large current generated during the short-circuit can burn the circuit components and the battery itself in a short time, or even explode. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to provide a voltage boosting protection circuit, which can perform short-circuit protection on the boosting circui...

AI Technical Summary

Problems solved by technology

In many cases, the output voltage value of the battery cannot meet the needs of the whole circuit, so the battery needs to be boosted, especially for the application of a single battery

In addition, when the battery is in use, short-circuit protection is very necessary. If there is no short-circuit protection, the large current generated during the short-circuit can burn the circuit components and the battery itself in a short time, or even explode.

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