PTC and NTC double-temperature-control circuit and temperature control method thereof

Abstract

The invention discloses a PTC and NTC double-temperature-control circuit and temperature control method of the PTC and NTC double-temperature-control circuit. The PTC and NTC double-temperature-control circuit comprises a heating element and a controller, wherein the heating element comprises an induction wire, an NTC layer and a PTC heating wire, and the controller comprises a fuse, a capacitance resisting and voltage relief circuit, an indicating lamp circuit, a power source voltage detecting circuit, a synchronous signal circuit, a high-frequency square wave emitting circuit, a high-frequency square wave receiving circuit, an NTC voltage detecting circuit, an NTC load detecting circuit, a PTC load detecting circuit, a protection thyristor, an operation thyristor, an operation thyristor short circuit detecting circuit and a central processing unit. According to the PTC and NTC double-temperature-control circuit and temperature control method of the PTC and NTC double-temperature-control circuit, the operation thyristor and the protection thyristor are matched with each other, when the operation thyristor is out of control, the protection thyristor can cut off a power source in time and synchronously checks the operating states of the PTC heating wire and the induction wire, and failure detecting ability is stronger.

Description

technical field [0001] The invention relates to the technical field of temperature control, in particular to a PTC and NTC dual temperature control circuit and a temperature control method thereof. Background technique [0002] At present, the main principle of the temperature control circuit of traditional heating pads, electric blankets and other electric heating products in the domestic market is to control the on and off of the temperature switch. The principle of this temperature control circuit is simple, but it has obvious deficiencies in fault detection. The switch of the switch is often in the on-off state, so it will inevitably run out of control, and the temperature control circuit of the prior art does not pay attention to the detection of the switch out of control, causing the product to be heated until the heating wire burns out, causing unnecessary casualties and property losses. Contents of the invention [0003] (1) Technical problems to be solved [0004...

AI Technical Summary

Problems solved by technology

[0002] At present, the main principle of the temperature control circuit of traditional heating pads, electric blankets and other electric heating products in the domestic market is to control the on and off of the temperature switch. The principle of this temperature control circuit is simple, but it has obvious deficiencies in fault detection. The switch is often in the on-off state, so it is inevitable that it will be out of control, and the temperature control circuit of the prior art does not pay attention to the detection of the switch out of control, causing the product to be heated until the heating wire burns out, causing unnecessary casualties and property losses

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