Voltage surge detection circuit

Abstract

The invention relates to a voltage surge detection circuit, which comprises a rectification circuit, a surge detection circuit and a zero-cross detection circuit, wherein an input end of the surge detection circuit and an input end of the zero-cross detection circuit are respectively connected with the rectification circuit, an output end of the surge detection circuit is connected with an output end of the zero-cross detection circuit, and alternating current mains supply is converted into direct current mains supply by the rectification circuit. A mains supply alternating current voltage signal is detected by the surge detection circuit disclosed by the invention, and if the mains supply alternating current voltage signal has the surge phenomenon, the circuit takes effect, and the output surge signal is a high-level signal. The signal triggers subsequent surge protection circuits to work, and related power components are protected against damage. If the mains supply alternating current signal does not have the surge phenomenon, the output surge signal is a low-level signal. The surge phenomenon in a circuit can be accurately detected by the voltage surge detection circuit, so that a semiconductor power component in a circuit system can be effectively protected.

Description

technical field [0001] The invention relates to the technical field of circuit system protection, in particular to a voltage surge detection circuit, which is suitable for circuit systems that are sensitive to voltage mutations and need to detect and protect voltage surges, such as electromagnetic heating systems, frequency conversion control circuit systems, etc. . Background technique [0002] In the electromagnetic heating circuit or frequency conversion control circuit system, the general circuit design has high output power and relatively large current. The semiconductor power components used for power conversion need to be protected, especially for the transient voltage surge mutation generated in the circuit. protection from damage to power conversion semiconductors. In the actual circuit, there are not only positive surges, but also a large number of negative voltage drops. Research has found that, in addition to positive surges that can damage semiconductor power c...

AI Technical Summary

Problems solved by technology

In the actual circuit, there are not only positive surges, but also a large number of negative voltage drops. Research has found that, in addition to positive surges that can damage semiconductor power components in the circuit, negative voltage drop surges also exist. The defect of damaging power components, and there is no bidirectional voltage surge detection circuit that can target both positive surges and negative drop surges in the prior art, so it cannot effectively protect the semiconductor power in the circuit system element

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