Apparatus for monitoring inverter bypass switching

Abstract

The invention relates to an inverter bypass switching monitoring device, including an AC voltage mutual inductor, an electric network voltage and phase detecting unit, an inverted voltage detecting unit, an AC transducer, a load current detecting unit, an isolation driving circuit, a main-switching device, a crystal vibrator, a reset circuit and a voltage reference circuit, the network voltage is converted by the AC voltage mutual inductor to enter the network voltage and phase detecting unit, and then connects to two input pins of a MCU; the inverted voltage is converted by the AC voltage mutual inductor to enter the inverted voltage detecting unit and then connects with an input pin PTB2 of the MCU; the load current is converted by the AC transducer to enter the load current detecting unit and then connects with an input pin PTB3 of the MCU; the output pin of the MCU connects with the main switching device-the control end of a rapid silicon controlled rectifier through the isolation driving circuit. The structure is reasonable and the switching is short-cut, the safety of the device is high and the use range of the device is wide.

Description

technical field [0001] The invention relates to a power monitoring device, in particular to an inverter power bypass switching monitoring device. Background technique [0002] We know that with the development of society, more and more occasions require the use of inverter power, such as power, communication, financial and other systems, to protect the continuity of power supply of some important equipment and avoid data loss caused by power failure. Failures such as loss, network breakdown, loss of control of protection equipment, etc. At present, contactors and thyristors are mostly used for switching when dealing with inverter output and grid bypass. The switching time of the contactor is long, generally 10-100mS, which is likely to cause failures such as computer crashes and equipment misoperations, and can only be used in occasions where the switching time is not strictly required. The use of silicon controlled rectifiers can effectively control the switching time, bu...

AI Technical Summary

Problems solved by technology

The switching time of the contactor is long, generally 10-100mS, which is likely to cause failures such as computer crashes and equipment misoperations, and can only be used in occasions where the switching time is not strictly required.

The use of silicon controlled rectifiers can effectively control the switching time, but it often occurs that the device is destroyed due to improper control.

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