Inverter circuit with overcurrent protection function

Abstract

The invention discloses an inverter circuit with an overcurrent protection function, and the circuit comprises a power supply circuit, an auxiliary power module, a DC-AC module, a transformer, an AC-DC module, an inversion module, a control chip and an overcurrent protection module. The inversion module is a full-bridge inverter topological structure comprising four first MOS tubes, and the grid electrode of the first MOS tube is connected with the output end of the control chip. The overcurrent protection module is configured in a manner that an output end cuts off the control of the controlchip for the first MOS tube when a current passing through the first MOS tube is greater than a set value. The circuit achieves the detection of an output current of the inversion module through the overcurrent protection module, judges whether the output current of the inversion module is greater than the set value set by the overcurrent protection module or not, and controls the connection between the grid electrode of the first MOS tube and the control chip according to a judgment result. The circuit can timely cut off the first MOS tube when the output current of the inversion module is too large, thereby guaranteeing that the first MOS tube is not damaged. The circuit is used for converting a direct current into a power frequency alternating current.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an inverter circuit structure with an overcurrent protection function. Background technique [0002] As a conventional power supply source, batteries are widely used in various electrical equipment. However, since the output of the battery is DC voltage, it cannot be directly connected to AC electrical equipment. It is necessary to convert the DC output of the battery into AC power through an inverter. Then output to AC power equipment. [0003] Although the existing inverter is equipped with the necessary overcurrent protection circuit, the overcurrent protection circuit is configured at the output end of the inverter circuit. When a short circuit occurs in the electrical equipment, it can cut off the inverter and The energized connection of the electrical equipment is used to ensure the safety of the electrical equipment, but it causes damage to the inverter to a certain ext...

AI Technical Summary

Problems solved by technology

[0003] Although the existing inverter is equipped with the necessary overcurrent protection circuit, the overcurrent protection circuit is configured at the output end of the inverter circuit. When a short circuit occurs in the electrical equipment, it can cut off the inverter and The energized connection of the electrical equipment is used to ensure the safety of the electrical equipment, but it causes damage to the inverter to a certain extent.

In the traditional inverter circuit, the switch tube is turned on and off to realize the conversion of DC power to AC power. If the connected electrical equipment has a short-circuit fault, the current flowing through the switch tube will exceed the limit current of the switch tube, thereby burnt switch tube

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