Device and technology for solving short circuit of electric blanket while maintaining normal operation

Abstract

The invention provides a device and technology for solving a short circuit of an electric blanket while maintaining the normal operation. By means of random access of a four-wire electric blanket alternating current control switch, a focus-free alternating current switch of a photoelectric coupling assembly comprising a light emitting device and a photoconductive device can be connected as long asa breakpoint is made at any position of alternating current, and the transmission of on-off control signals to each controlled power-off switch in an optical isolation mode needs to be completed through at least one photoelectric coupling assembly. Energy is taken from load current by a current transformer to establish a power supply of a control circuit. The electric blanket alternating currentfour-wire solid-state switch has a particularly excellent short-circuit protection function, namely, surge-free short-circuit protection, electric sparks are generally not generated at the short-circuited position when loads are all short-circuited, and no damage is caused to the power supply, the wire, the switch and the like. The switch is externally provided with four leads, and when two of theleads are short-circuited, the other two leads are switched to enable the electric blanket to continue to operate normally.

Description

[0001] 1. Technical field [0002] The invention relates to the design field of electric heating blankets, and proposes a device and technology for solving the short circuit of the electric heating blankets and still working normally. [0003] 2. Background technology [0004] The invention and use of electricity has brought great changes to people's production and life. The widespread use of electricity has driven lasting and profound structural changes in production. Electricity gradually replaced steam. In the 1870s, as new electricity entered the production field as a new energy source, it became the main power of factory machines, and human history entered the "Electrical Age". Due to the use of electricity, other industrial sectors have also developed rapidly, especially the development of the steel industry, which has made mankind bid farewell to the "cotton era" in the field of materials. Electrification and the advent of the "Steel Age" marked the rise of modern ind...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned defects in the design of the existing electric blanket, and provide a method to solve the safety problems such as electric shock casualties and fires caused by the surge current generated when the wires of the electric blanket are short-circuited, so as to solve the problem of short-circuit hazards of the electric blanket and ensure its safety. The circuit is safe, and the electric blanket can continue to work normally through the two wires at the other end when a short circuit occurs

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