Method and device for improving performance of intrinsic safety switching power supply

Abstract

The invention discloses a method and a device for improving the performance of an intrinsic safety switching power supply in an explosive dangerous environment. By adoption of the method for detecting the change rate of a current by an inductor, a main circuit is cut off; the time of the current change during short circuit is delayed by the inductor to make the current start rising after a voltage is reduced to zero, so discharging energy during the occurrence of a fault is reduced; and the change rate of the current during the short circuit is controlled by the inductor, so the influence of electromagnetic interference (EMI) is reduced. A current differential measurer of the device is connected with an input end of a driving circuit; an output end of the driving circuit is connected with control ends of switches; the first switch is connected in series with a current-limiting inductor; the second switch is grounded by a load resistor (RL); the current-limiting inductor is connected in parallel with a diode; and the current-limiting inductor and the diode which are connected in parallel are grounded by the RL. The invention has the advantages that: the power of the intrinsic safety switching power supply is improved; the safety and reliability of an intrinsic safety system are improved; the change rate of the current is reduced; and the EMI is reduced.

Description

technical field [0001] The invention relates to an intrinsically safe switching power supply in an explosive hazardous environment, in particular to a method and a device for improving the performance of the intrinsically safe switching power supply. Background technique [0002] At present, the explosion-proof types commonly used in the world include: flameproof type, increased safety type, intrinsically safe type and so on. Comparing various explosion-proof forms, we can see that the intrinsically safe electrical equipment guarantees the explosion-proof requirements from the electrical parameter design of the circuit, saves the heavy explosion-proof shell, has a high degree of safety, small size, light weight, easy to carry and maintain and low cost. And other advantages, so intrinsically safe circuits are widely used. [0003] The widespread use of high-power electrical equipment has increased the demand for high-power intrinsically safe switching power supplies. And du...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for improving the performance of the intrinsically safe switching power supply, to solve the problem that the power of the intrinsically safe switching power supply is relatively small and the EMI effect of the intrinsically safe switching power supply is poor

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