Relay fault detection circuit and fault detection method thereof

Abstract

The present invention discloses a relay fault detection circuit and a fault detection method thereof. The circuit comprises a relay, an optocoupler, a switching switch and a signal control unit, wherein the optocoupler is used for detecting the voltage between the two output ends of the relay, the switching switch is connected between one output end of the relay and the optocoupler, and the control end of the relay, the control end of the switching switch and the output end of the optocoupler are connected to the signal control unit. The method comprises the following steps that: the signal control unit controls a switching switch, thus controls the optocoupler to collect the voltage between the two output ends of the relay periodically, and generates an output signal; and whether the relay is failed or not is judged according to the switch state of the relay and the output signal. According to the relay fault detection circuit and the fault detection method, through controlling the switching switch to collect the voltage between the two output ends of the relay periodically, a detection time is short, and the problem of load flicker is solved.

Description

technical field [0001] The invention relates to the field of fault detection, in particular to a relay fault detection circuit and a fault detection method thereof. Background technique [0002] Relays are usually used to provide signal switching. With the continuous development of society, there are more and more high-rise buildings. Relays are used to control the motors of various lamps in the building. Due to the variety of equipment on the construction site, the structure is very Complicated, there are resistive loads, such as incandescent lamps; capacitive loads, such as fluorescent lamps; inductive loads, such as motors; the power of equipment is also different, ranging from a few watts to several kilowatts. The relay needs to control and drive these different devices. Since the power supply of the devices used on site is 220V AC mains, in the process of relay application, the opening and closing of the device will have a great impact on the relay, so the relay is like...

AI Technical Summary

Problems solved by technology

[0006] In view of the problems existing in the above-mentioned prior art, the present invention proposes a relay fault detection circuit and its fault detection method. The voltage on both sides of the relay is periodically sampled by controlling the switching switch, and the detection time is only tens of ms. Whether it is No leakage current flows through any load, which solves the problem of load flickering

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