Zero Power Standby Circuit

Abstract

The invention discloses a zero-power-consumption standby circuit and relates to the technical field of household appliances. The zero-power-consumption standby circuit comprises a single chip microcomputer, a button detection circuit and a strong-current control circuit. The single chip microcomputer is respectively connected with the button detection circuit and the strong-current control circuit, and is used for receiving strong-current button signals detected by the button detection circuit, and triggering the strong-current control circuit to control connection and disconnection of strong currents and an electrical device. The single chip microcomputer is connected with weak-current power source, and the button detection circuit comprises a strong and weak current separation device which is used for preventing the strong currents from flowing to the single chip microcomputer. The zero-power-consumption standby circuit achieves zero power consumption of a standby state, avoids potential safety hazards, and enhances circuit safety.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a zero-power consumption standby circuit. Background technique [0002] At present, the country's requirements for the standby power consumption of household appliances are constantly improving, so various methods for reducing standby power consumption have emerged, such as low-power consumption devices, control methods and so on. For example, the washing machine first introduced a zero-power consumption control method, because most of the washing machine program controllers were designed in a floating way. Such as figure 1 As shown, when no button is pressed, the whole circuit is not charged. When SW312 is pressed, the circuit has current flow, and the single-chip microcomputer works. By controlling K1 to close, the button SW312 is lifted at this time, and the circuit still has power. When the program finishes running or the button input terminal detects that SW31...

AI Technical Summary

Problems solved by technology

[0003] The design of the above zero-power consumption circuit is designed for the floating mode. Although it can achieve zero power consumption in standby mode, the safety is not high. The disadvantages of this circuit are:

[0004] 1. In order to meet the ground-type design, the weak current +5V and the strong current are connected together, such as figure 1 The middle L' end is connected after K1 is closed, so that when there is electricity, the whole circuit will have strong electricity. If some touch buttons are used on home appliances, it will cause electric shock, which is easy to cause safety hazards

[0005] 2. When the two ends L and L' of the button SW312 are connected, they are directly connected to the single-chip microcomputer. If the two ends L and L' are wrongly connected, the single-chip microcomputer and the entire circuit will be damaged.

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