An overvoltage protection circuit and projector

Abstract

The invention relates to the technical field of projection equipment, and discloses an overvoltage protection circuit and a projector. The circuit includes: a first detection circuit, a switch circuit, an action and a delay recovery circuit, wherein the first detection circuit is used to detect output voltage, when the output voltage is higher than the preset overvoltage value, the switch circuit is turned on, so that the action and the delay recovery circuit trigger the overvoltage protection action, and after the preset delay period, the first detection The circuit restarts to detect the output voltage of the power module so as to carry out overvoltage protection again. Through the circuit composed of discrete components, the overvoltage protection function and the automatic recovery function after the action are realized. The circuit structure is simple and the cost performance is high. The circuit is Modular design, suitable for most power circuits, with good versatility and universal applicability.

Description

technical field [0001] The invention relates to the technical field of projection equipment, in particular to an overvoltage protection circuit and a projector. Background technique [0002] In the power module, in order to make the power module work more reliably, it is generally necessary to have an overvoltage protection circuit. Some control ICs do not have an overvoltage protection function, so they need to be implemented with peripheral circuits; although some control ICs are integrated with an overvoltage protection function, there is a possibility that their own control may be disordered. When an overvoltage occurs, effective protection is still not available. Therefore, the existing overvoltage protection circuit has the disadvantage that the overvoltage protection performance is not stable enough or cannot automatically restore normal output. Contents of the invention [0003] The main purpose of the present invention is to provide an overvoltage protection circ...

AI Technical Summary

Problems solved by technology

Some control ICs do not have an overvoltage protection function, so they need to be implemented with peripheral circuits; although some control ICs are integrated with an overvoltage protection function, there is a possibility that their own control may be disordered. When an overvoltage occurs, effective protection is still not possible

Therefore, the existing overvoltage protection circuit has the disadvantage that the overvoltage protection performance is not stable enough or cannot automatically restore normal output

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