Heating device capable of eliminating induction electricity

Abstract

The invention relates to a heating device capable of eliminating induction electricity. The heating device comprises a PTC heating element and metal pieces arranged at the two sides of the PTC heating element respectively. The metal pieces are peripherally and sequentially wrapped by a first insulating layer, a metal shielding layer and a second insulating layer from inside to outside. The metal shielding layer provides a first input end and a second input end, wherein the first input end and the second input end are connected with a null / live wire signal sampling circuit. The null / live wire signal sampling circuit is connected with a null / live wire identification circuit. The null / live wire identification circuit is connected with a first power-on sequence circuit, a second power-on sequence circuit and a null wire locking circuit. The advantages of the heating device are that: through corresponding action design, circuit processing and logical judgment, the connection with the metal shielding layer of a heating pipe and a commercial power zero wire are kept all the time, thereby blocking a PTC ceramic heating block and an affiliated connection mechanism from generating distributed capacitance with a heat-conductive metal tube and water, and further, eliminating induction electricity on the surface of the heating pipe and in the water of a foot bath device.

Description

technical field [0001] The present invention relates to a foot bath, in particular, a heating device capable of eliminating induction electricity. Background technique [0002] As a second-class electrical appliance in household appliances, foot baths do not require the use of grounding wires. Therefore, the presence of induced electricity in foot baths is a long-standing safety problem in the water-filled foot bath industry. The induction electricity will pass through when users bathe their feet. The human body discharges electricity to the ground, causing the user to feel electric numbness. The reason for the induced electricity is that the heating element body and the attached connection mechanism in the heating device will generate distributed capacitance with the heat-conducting metal of the heating device and the water connected to the metal. Through the effect of the distributed capacitance, the heating element body and the The attached connecting mechanism makes the...

AI Technical Summary

Problems solved by technology

[0002] As a second-class electrical appliance in household appliances, foot baths do not require the use of grounding wires. Therefore, the presence of induced electricity in foot baths is a long-standing safety problem in the water-filled foot bath industry. The induction electricity will pass through when users bathe their feet. The human body discharges the earth, which in turn makes the user feel electric numbness

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