Safety control structure for heating wires

Abstract

The invention discloses a safety control structure for heating wires. The safety control structure comprises a switch, a first heating wire, a second heating wire and an overcurrent protective element, wherein an insulation fusible layer is arranged between the first heating wire and the second heating wire; and therefore, in a normal state, a trigger circuit triggers the switch, so that the first heating wire and the second heating wire can perform a heating action in a preset temperature range; but when the first heating wire and the second heating wire generate an abnormal high temperature, the insulation fusible layer is fused, and the first heating wire and the second heating wire are in a short-circuit state, so that a current value is instantly increased, an overcurrent protective element interruption circuit is in an open-circuit state, and continuous heating is stopped.

Description

Technical field [0001] The invention relates to a heating wire safety control structure, in particular to a heating device that can interrupt the power supply to stop heating when the heating wire generates abnormally high temperature to ensure safe use, and is suitable for heating devices such as electric blankets and hot compress pads. Background technique [0002] Heating devices such as hot compress pads have been widely used in the market, and the heating wire can be automatically interrupted after heating to the temperature set by the user, so that the heating device can be kept within a predetermined heating range. Provides functions such as hot compresses and ensures safe use. [0003] In order to effectively achieve the effect of temperature control, US Patent No. 5,861,610 uses a positive temperature coefficient (PTC) element as a detection line to sense temperature changes, and at the same time it is equipped with a heating line for temperature control heating . The ab...

AI Technical Summary

Problems solved by technology

However, each temperature control circuit is quite complicated. When the circuit components such as the detection or controller are damaged, the heating wire will continue to be heated, causing danger.

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