Dual protecting temperature control circuit and air frying pan

Abstract

The invention relates to a dual protecting temperature control circuit and an air frying pan and relates to the technical field of temperature control circuits. The circuit comprises a single chip microcomputer, a PWM driving circuit, a relay and a silicon controlled control circuit which are successively connected, wherein the single chip microcomputer is also connected to a zero cross detectioncircuit and the silicon controlled control circuit, the relay is connected to a living wire, and the silicon controlled control circuit is connected to the relay or a zero line; the single chip microcomputer is used for acquiring the cross zero point of the zero cross detection circuit and capable of controlling the working condition of the silicon controlled control circuit to output a PWM pulsesignal; the PWM driving circuit is controlling the relay to be on and off according to the input PWM pulse signal; the reliability is improved based on small amplitude temperature control by means ofa serial control mode of the controlled silicon and the relay, so that the dual protecting function is achieved.

Description

technical field [0001] The invention relates to the technical field of temperature control circuits, in particular to a double-protection temperature control circuit and an air fryer. Background technique [0002] The traditional air fryer thermostat is generally controlled by two relays connected in parallel, one for controlling the heating device and the other for controlling the fan. This control method cannot adjust the power, and the heating range is relatively large, which is not conducive to small-range control of temperature adjustment. [0003] The other is two SCR parallel control methods, one for controlling the heating device and the other for controlling the fan. This control method is less reliable. If the SCR is broken down and short-circuited, the heating device will continue to heat, causing safety hazards. Hidden danger. Contents of the invention [0004] In view of this, the purpose of the present invention is to provide a dual protection temperature co...

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Problems solved by technology

[0002] The traditional air fryer thermostat is generally controlled by two relays connected in parallel, one to control the heating device and the other to control the fan. This control method cannot adjust the power, and the heating range is relatively large, which is not conducive to small-scale control of temperature adjustment.

[0003] The other is two SCR parallel control methods, one for controlling the heating device and the other for controlling the fan. This control method is less reliable. If the SCR is broken down and short-circuited, the heating device will continue to heat, causing safety hazards. Hidden danger

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