Power grid open-phase detection device and method for controlling switch tube in rectifier bridge

Abstract

The invention discloses a power grid open-phase detection device and a method for controlling a switch tube in a rectifier bridge, and the power grid open-phase detection device comprises a voltage detection circuit and an open-phase detection circuit. The input end of the voltage detection circuit is connected with each switch tube in the rectifier bridge, and the voltage detection circuit is used for outputting a first voltage detection signal to the open-phase detection circuit when any switch tube meets a preset condition; when any switch tube does not meet the preset condition, a second voltage detection signal is output to the open-phase detection circuit; the open-phase detection circuit is used for outputting a normal signal when the first voltage detection signal is received; and when the second voltage detection signal is received, an open-phase fault signal is output. The power grid open-phase detection device can solve the technical problems that an existing power grid open-phase fault detection circuit is complex in structure, and time delay is large when power grid open-phase fault detection is carried out in a software mode.

Description

technical field [0001] The invention belongs to the technical field of power electronic equipment, and in particular relates to a power grid phase loss detection device and a method for controlling a switch tube in a rectifier bridge. Background technique [0002] With the development of power electronics technology, the application of rectifier bridges on the rectification side of high-power inverters is also increasing. [0003] In related technologies, the three-phase power grid is prone to phase loss during the high-voltage and complex working process. If the phase loss fault is not detected in time or takes a long time to detect and eliminate, it will damage the relevant power equipment such as the rear rectifier bridge. lead to serious economic property losses. [0004] However, the traditional power grid phase loss fault detection circuit mainly uses software to detect the power grid phase loss fault. Not only the circuit structure is complex, but also it cannot resp...

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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a power grid phase loss detection device, which aims to solve the problem ...

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