Intrinsic safety type power circuit and device with intrinsic safety type power circuit

Abstract

The invention discloses an intrinsic safety type power circuit and a device with the intrinsic safety type power circuit. The intrinsic safety type power circuit comprises a double current-limiting protection circuit, a double output overvoltage protection circuit and a double output short-circuit protection circuit. The intrinsic safety type power circuit is provided with a strong fault-detecting defective function and a self-recovery work function. The intrinsic safety type power circuit can be started automatically after a fault recovery and strong in anti-jamming capacity. The intrinsic safety type power circuit is arranged inside a box body with an explosive-proof function in a containing mode. The device is further provided with the explosive-proof function and safe and reliable and suitable for the anti-explosion field. In addition, the intrinsic safety type power circuit further comprises a soft-start protection circuit. A normal start of the whole intrinsic safety type power circuit is controlled through the soft-start protection circuit. After the intrinsic safety type power circuit is started normally, the soft-start protection circuit stops working. A sudden increase of a current, a voltage and the like and an overcurrent, an overvoltage or a short trouble occurred are avoided in the start process.

Description

technical field [0001] The present invention relates to the technical field of electric power supply, more specifically, relates to an intrinsically safe power supply circuit and a device with the power supply circuit. Background technique [0002] In underground coal mines, petrochemical industry, metallurgy and other fields, due to the existence of explosive or combustible substances, various electrical equipment used in these fields must meet the explosion-proof technical standards of related fields before they can be officially used. At present, there are three types of common explosion-proof devices, namely intrinsically safe type, flameproof type and increased safety type. For intrinsically safe (intrinsically safe) explosion-proof devices, the purpose of explosion-proof is achieved by suppressing the energy of the ignition source. Due to its simple structure, wide application range, simple operation and convenient maintenance, it is widely used in the explosion-proof ...

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Problems solved by technology

[0005] In view of this, the present invention provides an intrinsically safe power supply circuit and a device with the power supply circuit to overcome the problem in the prior art that the device automatically stops working after detecting a fault, but cannot automatically resume work after the fault is eliminated. The problem

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