Overvoltage indication circuit, overvoltage indication method and household electrical appliance

Abstract

The invention discloses an overvoltage indication circuit, an overvoltage indication and a household appliance. The overvoltage indication circuit comprises a first indication circuit and a voltage detection circuit. The first indication circuit comprises overvoltage indicating lamps which are electrically connected in series; the first end of each overvoltage indicating lamp is electrically connected with a live wire of an alternating-current power supply through a second current-limiting resistor, and the second end of each overvoltage indicating lamp is electrically connected with a zero line of the alternating-current power supply through a controllable element; the voltage detection circuit comprises a bidirectional trigger diode; the first end of the bidirectional trigger diode is electrically connected with the live wire of the alternating-current power supply through a first current-limiting resistor, and the second end of the bidirectional trigger diode is electrically connected with the control end of a controllable element; and when the alternating-current voltage reaches or exceeds the overvoltage threshold, the bidirectional trigger diode is conducted to trigger the controllable element to be conducted, so that an overvoltage indicating lamp is electrified and lightened to indicate that overvoltage exists in the alternating-current voltage of the alternating-current power supply. The overvoltage indication circuit provided by the invention has the advantages of simple circuit structure, low implementation cost, stability, reliability and the like.

Description

technical field [0001] The invention relates to overvoltage detection technology, in particular to an overvoltage indicating circuit, an overvoltage indicating method and a household appliance with the overvoltage indicating circuit. Background technique [0002] This section only provides background information related to the application to facilitate those skilled in the art to understand the application more thoroughly and accurately, and it is not necessarily the prior art. [0003] Electronic devices such as home appliances usually provide a voltage detection function to detect whether the used voltage is too high, and intuitively reflect the voltage detection result through the indicator light, especially to remind users to pay attention to the safety of electronic devices when the used voltage is too high. [0004] Such as figure 1 As shown, most of the existing technologies use single-chip microcomputers for overvoltage detection and indicate the detection results t...

AI Technical Summary

Problems solved by technology

[0005] Although the prior art utilizes the single-chip microcomputer 12 to cooperate with the voltage detection circuit 13 to accurately detect whether there is an overvoltage to the alternating current provided to the power consumption circuit, the prior art relies on the single-chip microcomputer or similar controllers to realize, and the required circuit modules are relatively large. Many, the circuit is more complex and the overall implementation cost is higher

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