CN2657253Y - Single chip machine controlled universal antielectric wall device for electric appliance - Google Patents

Abstract

The utility model discloses a singlechip controlled, electric appliance universally used electric wall device, more particularly a personal safety protective device under the circumstance of failures of earth connection and basic insulation at the same time, pertaining the electronic technical field, which characterized in that the detection signal of the ground wire and the mull wire and the live wire detection device are connected with the I/O input end of the singlechip respectively, while the I/O output end of the singlechip is connected with the electronic switch circuit; the buck circuit of the detection circuit has two forms of transformer buck and switch tube buck. The utility model overcomes the defeat of the electric appliance product of lacking personal safety protective function when the earth connection and basic insulation fail at the same time thus can be wildly used in all kinds of electric appliances.

Description

Monolithic processor controlled electric appliance general electricity-preventing wall device

Technical field the utility model belongs to electronic technology field.

Before background technology the utility model applying date, the personal safety protector that each electric appliances does not mostly have live wire when electric leakage does not have ground connection and the basic insulation personal safety protector when losing efficacy simultaneously especially.

The summary of the invention the purpose of this utility model is exactly to overcome the shortcoming that prior art exists, and the personal safety protector that a kind of electrical equipment connects instead ground connection and basic insulation inefficacy simultaneously, ground wire electrification, fiery ground wire, live wire can cut off ground wire or ground wire and live wire in real time when leaking electricity is provided.When local tape was electric, the potential difference that produces between ground wire and zero line obtained high level through reduction voltage circuit, makes the switching tube conducting that is connected on the reduction voltage circuit, and the Single-chip Controlling electronic switch disconnects, and cuts off ground wire in real time or cuts off ground wire and live wire simultaneously.The potential difference that produces between ground wire and zero line is zero or when approaching zero, the switching tube that is connected on the reduction voltage circuit ends, and electronic switch disconnects, and the normally-closed contact on the electronic switch links to each other ground wire or live wire.

Description of drawings Fig. 1 is a circuit structure block diagram of the present utility model, and 1 is single-chip microcomputer among the figure; 2 for being connected across the signal deteching circuit between ground wire and zero line; 3 is the live wire earth detector; 4 is electronic switching circuit; Fig. 2 is that the utility model embodiment one Fig. 3 is the utility model embodiment two.

Embodiment the utility model ground wire electrification signal deteching circuit is connected across between ground wire E and the zero line N, provides detection signal by reduction voltage circuit to single-chip microcomputer, and the utility model embodiment one reduction voltage circuit is by transformer T and rectifier D ₁-D ₄Voltage-stabiliser tube W forms, and is equivalent to capacitance-resistance R ₁C ₁Reduction voltage circuit.The utility model embodiment two reduction voltage circuits are by capacitance-resistance R ₁C ₁With rectification circuit D ₁-D ₄Form, be equivalent to the reduction voltage circuit that transformer T forms.Electronic switch is by relay J ₁Or J ₁J ₂Form.Switch transistor T ₁Or T ₁T ₂Level according to the reduction voltage circuit signal is just exported high level or low level, the conducting of control switch pipe (high level) with by (low level).

Claims (1)

1. A kind of monolithic processor controlled electric appliance general electricity-preventing wall device, its principal character are to have an anti-electric wall checkout gear, and its test point is taken from potential difference between ground wire and zero line and the difference between current between live wire and zero line.

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