An Intrinsically Safe Circuit with Improving Capacitive Load Starting Ability

Abstract

The invention discloses an intrinsically safe circuit for improving the capacitive load start capacity. The intrinsically safe circuit for improving the capacitive load start capacity comprises a switching voltage regulator circuit which is connected with a main power supply access and used for providing voltage regulator direct current output, a compensating pipe control circuit connected with the voltage output circuit, an overcurrent and overvoltage protection circuit which is connected with the compensating pipe control circuit and used for real-time monitoring and regulating of the overvoltage output, short circuit and overcurrent output of the circuit, a counting unit connected with the overcurrent and overvoltage protection circuit, and a monostability trigger circuit which is connected with the counting unit and the compensating pipe control circuit. The counting unit is controlled to count when overcurrent or short circuit occurs during the output of the circuit; when the counting unit counts to a threshold, the monostability trigger circuit enters a temporary steady state output state and controls the compensating pipe control circuit connected with the monostability trigger circuit to cut off the output; when the short circuit or the overcurrent is recovered, a counting signal of the counting unit is invalid; the compensating pipe control circuit outputs normally.

Description

technical field [0001] The invention relates to an intrinsically safe circuit capable of providing capacitive load starting capability. Involving patent classification number H02 Power generation, power transformation or power distribution H02H Emergency protection circuit device H02H3 / 00 Automatic disconnection of emergency protection circuit device that responds directly to unexpected changes in normal electrical work, with or without reconnection H02H3 / 26 pairs Responsive to a difference in voltage or current; H02H3 / 32 Responsive to a phase difference between voltages or currents includes comparing voltage or current values ​​at corresponding points on different conductors of a single system, e.g. current. Background technique [0002] The intrinsically safe circuit part of the traditional mining intrinsically safe power supply mostly adopts the linear regulated output mode, and the constant current output is used as the main means to suppress the spark discharge. When t...

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Problems solved by technology

[0004] The present invention aims at the problem that during the start-up process of the capacitive load of the intrinsically safe circuit in the prior art, the load will generate a large current impact at the moment of start-up, resulting in over-current protection, and the continuous over-current protection mechanism will cause the problem that the load cannot be started. The developed An intrinsically safe circuit with improved capacitive load start-up capability, having:

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