Constant-temperature controlled circuit for an electric heating device
This disclosure discloses a constant-temperature controlled circuit for an electric heating device, comprises an AC/DC switching circuit, a heating strip and a temperature controlled circuit; the heating strip comprises a heating line, a temperature sensing line and a NTC layer located between the heating line and the temperature sensing line; the temperature controlled circuit comprises a central processing unit, a voltage sampling circuit, a TRIAC circuit and a load detection circuit. Compared with existing technology, in the heating process, resistance of the NTC layer decreases as the temperature increases, since the heating strip and the voltage sampling circuit are connected in series, the output sample voltage of the voltage sampling circuit reflects the current temperature, and then the central processing unit outputs controls to switch the TRIAC circuit on or off according to the sample voltage, keeping the device at a constant temperature. Constant temperature control is realized.
Dongguan City Sinoshine Technology Co., Ltd.
H G
H05B G05D
inventional inventional
Jihong
Chen