Safety breaking method and device for electric blanket

Abstract

The invention discloses a safety circuit breaking method for an electric blanket. In the method, the rolling-up or lamination state of the electric blanket is judged, power is supplied to the electric blanket as usual if the electric blanket is not rolled-up or laminated, and power supply to the electric blanket is stopped if the electric blanket is really rolled-up or laminated. A safety circuit breaking device adopting the method for the electric blanket structurally comprises a master control chip, the electric blanket, a detection wire group and a protective switch circuit, wherein the master control chip is connected with a power supply; the electric blanket is connected with the master control chip; the detection wire group is arranged on the electric blanket in an enclosing way, and comprises A wires and B wires which are arranged at small intervals; the A and B wires are nakedly arranged on the surface of the electric blanket; and the protective switch circuit is connected with the master control chip, and is also connected with the A and B wires respectively. All the A and B wires are short-circuited when the electric blanket is randomly rolled up or laminated, so the protective switch circuit feeds a real-time signal back to the master control chip when the electric blanket is rolled up or laminated, and the master control chip immediately cuts power supply connection to the electric blanket off to radically eliminate the potential safety hazard of smoldering caused by the overhigh density of electric heating elements in local areas of the electric blanket.

Description

technical field [0001] The invention relates to an electric heating appliance, in particular to a method and device for safely disconnecting electric heating blankets. Background technique [0002] The electric blanket is a kind of contact electric heating appliance. The soft cable electric heating element is woven or sewn into the blanket in the shape of a snake, and it will emit heat when it is energized. According to the experience of many households using electric blankets, there are two main unsafe factors in the use of electric blankets: (1) electric shock accidents caused by poor insulation or insulation damage of electric blankets; The electric blanket is rolled up or stacked, and the density of the electric heating element in the local area is too high to cause smoldering, and the temperature is too high to cause burning accidents such as sparks and arcing. [0003] For the first unsafe factor, the potential safety hazard can be eliminated by strengthening the insu...

AI Technical Summary

Problems solved by technology

[0005] Due to the technical bottlenecks of current sensor materials and circuit structures, the above-mentioned improvement direction obviously cannot realize a safe electric blanket with a cost-effective price that meets market demand in the short term, nor can it be expected to solve the discomfort caused by smoldering of electric blankets. safety factors

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