Circuit and method for detecting the start and end time of arc when inductive circuit is disconnected

Abstract

The invention discloses a circuit and a method for detecting the start and end moments of an inductive circuit when an arc is disconnected. The circuit includes a voltage signal processing circuit, a phase-separation delay circuit and a comparison output circuit; the voltage signal processing circuit includes an instrument amplifier U1 and a voltage-stabilizing diode D1; The phase delay circuit includes a first phase delay circuit and a second phase delay circuit, the first phase delay circuit includes a capacitor C1, a first proportional resistor network and a second proportional resistor network; the second phase delay circuit includes a capacitor C2 , the third proportional resistance network and the fourth proportional resistance network; the comparison output circuit includes comparators U2 and U3, D flip-flop U4, switching diodes D2 and D3; the method includes steps: one, detection circuit connection, two, voltage signal processing , Third, the inductive circuit is disconnected to detect the start and end moments of the arc. The invention works stably and reliably, can quickly and effectively detect the starting and ending moments of arc discharge when the inductive circuit is disconnected, and has wide application range.

Description

technical field [0001] The invention belongs to the technical field of arc discharge detection when an inductive circuit is disconnected, and in particular relates to a circuit and a method for detecting the start and end moments of an arc when an inductive circuit is disconnected. Background technique [0002] There are a lot of flammable and explosive gases or substances in dangerous environments such as coal mines and petrochemicals. Electronic and electrical equipment used in these occasions must meet the requirements of intrinsic safety. For electronic equipment containing energy storage components such as inductors and capacitors, the electric sparks caused by the open circuit of the inductor and the short circuit of the capacitor may ignite flammable and explosive gases or substances, posing a serious threat to people and equipment in these environments. The safety spark test device is a device used to conduct spark tests on intrinsically safe explosion-proof equipmen...

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Problems solved by technology

[0004] In order to solve the above problems, the Chinese patent application number 201611261062.3 discloses a circuit and method for detecting the start and end moments of the inductance disconnection arc. The sudden rise of the voltage generated twice, but according to the breaking arc discharge characteristic curve of the small inductance inductive circuit, when the inductance is small, the breaking arc discharge voltage has been rising, and there is no obvious second sudden rise phenomenon, so for small inductance Breaking the arc discharge, using the patented circuit and method with the application number 201611261062.3 cannot accurately detect the end time of the breaking arc discharge

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