Series type energy-storage capacitor circuit for mine intrinsic safety power source

Abstract

The invention relates to a series type energy-storage capacitor circuit for a mine intrinsic safety power source. Intrinsic safety power source products are mainly operated in environment with inflammable and explosive gas, so the selection of components in circuits are very important, the selection of electrolytic capacitors is especially important due to the fact that the electrolytic capacitors are prone to explode when actual voltages exceed the upper limit of withstand voltage of the electrolytic capacitors, and the explosion definitely brings serious consequences in flammable gas. According to the series type energy-storage capacitor circuit for the mine intrinsic safety power source, an input voltage passes through a capacitor C1 after the input voltage is rectified by a rectifier bridge U1, an alternating current of 60 HZ is transformed into a direct current with a stable voltage by an energy-storage filtering wave of a capacitor C2, the direct current is output in two paths through a capacitor C3, wherein one path is that the direct current passes an oscillation module U3, an amplitude limiting circuit diode D1 and a diode D2 to be output to a seclusion type transformer U2, and the other path is that the direct current passes an oscillation module U4, a diode D3 and is output to the seclusion type transformer U2. The series type energy-storage capacitor circuit ensures the improvement of withstand voltage surplus capacity design of the energy-storage capacitor, therefore the safety of mining products is ensured, and product reliability and size are improved.

Description

technical field [0001] The invention relates to a series energy storage capacitor circuit of an intrinsically safe power supply for mines. Background technique [0002] Most of the intrinsically safe power supply products work in an environment with flammable and explosive gases. In this environment, the selection of components in the circuit is even more important, especially the electrolytic capacitor, because when the actual voltage exceeds the upper limit of the withstand voltage of the electrolytic capacitor , Electrolytic capacitors are prone to explosion, and this explosion in flammable gases will undoubtedly have serious consequences. [0003] In coal mines, the power grid fluctuates greatly. We generally select energy storage capacitors with 3 times the rated voltage, but low voltage and large capacity are the product characteristics of electrolytic capacitors. In order to improve the withstand voltage effect of electrolytic capacitors, many capacitor manufacturers ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a series energy storage capacitor circuit of mine intrinsically safe power supply, which solves the problems in the prior art that the capacitance withstand voltage margin is small and the volume of high withstand voltage electrophoresis is large

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