Circuit with electrostatic protection function, high-voltage integration circuit and air conditioner

Abstract

The invention discloses a circuit with an electrostatic protection function, a high-voltage integration circuit and an air conditioner. The circuit with the electrostatic protection function comprisesa voltage detection circuit, a main discharge circuit and a circuit to be protected. The voltage detection circuit is used for detecting an electrostatic voltage between a power supply line and a grounding line. The main discharge circuit is arranged to provide a main discharge channel for a static current. The circuit to be protected comprises a main circuit unit to be protected and an auxiliaryprotection circuit. The auxiliary protection circuit can carry out secondary discharge on electrostatic energy which is not completely discharged from the main discharge circuit, and simultaneously can discharge the electrostatic energy entered from the signal input end of the main circuit unit to be protected so as to prevent static electricity from entering into the main circuit unit to be protected via ports except for the power supply line and the grounding line. In the technical scheme, electrostatic protection is performed on the main circuit unit to be protected simultaneously from thepower supply line and a signal line and the electrostatic protection capability of an integral circuit is increased.

Description

technical field [0001] The invention relates to the field of high-voltage integrated circuits, in particular to a circuit with an electrostatic protection function, a high-voltage integrated circuit and an air conditioner. Background technique [0002] A high-voltage integrated circuit is a gate drive circuit with functions such as undervoltage protection and logic control. It combines power electronics with semiconductor technology, gradually replaces traditional discrete components, and is increasingly used in IGBT, high-power MOSFET drive field. Electrostatic discharge (ESD) phenomenon is one of the most important reliability problems that cause failure of integrated circuit products. Relevant research surveys show that 30% of integrated circuit failure products are caused by electrostatic discharge phenomena. In the process of manufacturing, packaging, testing, and transportation of integrated circuit chips, various degrees of electrostatic discharge events will occur....

AI Technical Summary

Problems solved by technology

Its protection mechanism is simple input and output diode protection. The circuit structure has limited impact resistance and cannot meet the requirements of existing high-voltage integrated circuits for electrostatic protection, and occupies a large chip area.

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