Short-circuit inductance energy bypass circuit for intrinsically safe boost converter

Abstract

The invention discloses a short-circuited inductance energy bypass circuit of an intrinsic safety Boost converter. The bypass circuit comprises a short-circuited cut-off protection circuit, a bypass drive circuit and an energy bypass circuit, wherein the short-circuited cut-off protection circuit and the bypass drive circuit are connected with the output end of a short-circuited signal production circuit, and the energy bypass circuit is connected with the output end of the short-circuited cut-off protection circuit. The short-circuited cut-off protection circuit comprises a short-circuited cut-off protection starting circuit and a short-circuited cut-off protection action circuit connected with the output end of the short-circuited cut-off protection starting circuit. The output end of the bypass drive circuit, the short-circuited signal production circuit and the energy bypass circuit are all connected with a main circuit of the intrinsic safety Boost converter, the main circuit of intrinsic safety Boost converter is connected with a current sampling circuit and a pulse signal production circuit, and the output end of the current sampling circuit and the pulse signal production circuit are connected. The short-circuited inductance energy bypass circuit is convenient to achieve, low in cost and capable of providing a discharging loop for energy in an inductance of the intrinsic safety Boost converter, and improves the intrinsic safety performance of the intrinsic safety Boost converter.

Description

technical field [0001] The invention belongs to the technical field of short-circuit protection of Boost converters, and in particular relates to a short-circuit inductance energy bypass circuit of intrinsically safe Boost converters. Background technique [0002] Intrinsically safe switching power supply is an important part of electronic equipment. In the intrinsically safe switching power supply of explosion-proof electrical equipment working in hazardous environments, in order to achieve a large enough output power and make the output voltage ripple small enough, the power supply The output terminal of the power supply usually contains a large-capacity filter inductor and capacitor. In addition, if the protection circuit cannot completely shut off the energy source of the power input terminal when the power supply fails, once a fault such as a short circuit occurs, the spark generated by it will inevitably detonate the power supply. Inflammable and explosive gases obviou...

AI Technical Summary

Problems solved by technology

However, for the energy storage of the inductor, although in the book "Intrinsically Safe Converter" and related reports, the method of dealing with the inductor energy during the short circuit fault is proposed, but when the output is short circuited, the switching tube is turned off, and the PWM output is low voltage. level, making the energy processing circuit unable to circulate normally, thus failing to achieve the expected effect

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