Overheat prevention circuit for heat source of thermotherapy device

Abstract

The present invention relates to an overheat prevention circuit for a heat source of a thermotherapy device used for providing heat fomentation and hot massage effects. When one of a plurality of heat sources is overheated, the overheat prevention circuit of a thermotherapy device according to the present invention controls the supply of electrical energy from a power supply primarily through a FET unit and then secondarily through a master FET unit. The present invention may further comprise a safety controller which can automatically block the supply of electrical energy to the heat sources, even when a main controller is in failure condition. The safety controller comprises a multivibrator connected to a clock signal line, a multiline for transferring a signal that is generated by the multivibrator and an AND gate for conducting an AND operation on input signals from a multiline and a control signal line.

Description

technical field [0001] The present invention relates to an anti-overheating circuit for the heat source of a thermotherapy instrument, especially relates to an overheating phenomenon of internal ceramics and external ceramics and other heat sources used in a thermotherapy instrument, which can automatically cut off the power supply, and even if the main control part is in the In an inoperable state, the anti-overheating circuit for the heat source of the thermotherapy instrument can also be automatically cut off from the power applied to the heat source. Background technique [0002] The thermotherapy instrument is a product that uses electric energy to heat the heating body at a high temperature, and makes the moxibustion instrument composed of jade generate far-infrared rays while touching or massaging the user's body parts, thereby providing moxibustion and massage effects. . [0003] At present, the thermotherapy instrument has been developed into an automatic type from...

AI Technical Summary

Problems solved by technology

[0012] However, in the thermotherapy apparatus of the prior art, unfortunately, the above-mentioned field-effect transistor (FET) may fail to work normally.

At this time, although the above-mentioned main control part normally sends a power supply interruption signal, because the above-mentioned field effect transistor (FET) does not work, it will continue to supply power, resulting in burns to the user's body

[0013] In addition, in the thermotherapy apparatus of the prior art, when the main control unit breaks down and continues to supply electric energy to the ceramic heat source in such a state, because the main control unit cannot work, therefore, although the above-mentioned heat source continues to overheat phenomenon, and there is no means to end or prevent the above

[0014] Therefore, in the thermotherapy device of the prior art, the user's body will be scalded due to continuous overheating, and what's more, there is a danger of causing a fire

Images