Control and protection circuit of heater, towel heating barrel and control method thereof

A towel heating barrel, comprising a control and protection circuit,

• wherein the control and protection circuit comprises
• a power module,
• a power supply module,
• a control module,
• a temperature detection module, and
• a heating module, wherein the power module, the power supply module and the heating module are connected in series to supply power to the heating module, the control module is in signal connection with the power supply module to control on and off of the power supply module, and the temperature detection module is in signal connection with the control module;
• the power supply module comprises a high-temperature protection switch, a fuse and a relay, the high-temperature protection switch and the fuse being connected in series with the heating module, and the power supply module being electrically connected with the power module through the relay;
• and
• the control module comprises a control circuit, the control circuit being connected with the relay in a controlled way and controlling on and off of the relay;
• wherein the power supply module further comprises an input circuit and a step-down chip, the input circuit being electrically connected with the power module;
• the step-down chip comprises a fourth pin connected with a live wire and a third pin connected with a zero wire, and the fuse is electrically connected with the fourth pin;
• the input circuit comprises a capacitor C1 connected in parallel with the third pin and the fourth pin, a resistor R1 and a capacitor C7 connected in series with the third pin, and a resistor R2 connected in parallel with the capacitor C7 and connected with the resistor R1.

A control method of a towel heating barrel, wherein the towel heating barrel comprises

• a display screen,
• a liner,
• an upper cover,
• a shell,
• a base, and
• a control protection circuit, the relay, fuse and high-temperature protection switch being all arranged on the liner, and the control protection circuit comprising a power module, a power supply module, a control module, a temperature detection module and a heating module, the control module being connected with the power supply module in signal to control on and off of the power supply module;
• the power supply module comprising a high-temperature protection switch, a fuse and a relay, the high-temperature protection switch and the fuse being connected in series with the heating module, and the power supply module being electrically connected with the power module through the relay;
• the display screen being provided with a control switch, a high-temperature indicator, a power indicator and a timing selection switch in control connection with the control module;
• the control method comprises following steps:
• pressing the control switch, after which the power indicator lights up and the relay is closed, and if the circuit is turned on normally, the control and protection circuit operates normally, and if there is a fault in the circuit, the high-temperature indicator flashes to give an alarm;
• making the high-temperature indicator constantly on when it is detected that a temperature of the liner reaches 45° C.;
• sending, by the control module, a control signal to the relay when it is detected that the temperature of the liner reaches the preset temperature T1, so that the relay automatically turns off, a flow path between the power module and the power supply module is cut off to prevent the temperature of the liner from rising continuously, and to make the temperature of the liner start to decrease;
• maintaining the temperature of the liner at a preset temperature T4 by continuously controlling starting and stopping of the relay when it is detected that the temperature of the liner has dropped to the preset temperature T4;
• disconnecting the relay again so that the temperature of the liner continues to dropping when the temperature of the liner is maintained at the preset temperature T4 for 12 minutes;
• maintaining the temperature of the liner at a preset temperature T5 by continuously controlling the starting and stopping of the relay when the temperature of the liner drops to the preset temperature T5;
• completely disconnecting the relay so that the towel heating barrel directly enters a standby state and the power indicator goes out when it is detected that the temperature of the liner is maintained at the preset temperature T5 for one hour;
• and
• making the high temperature indicator go out when it is detected that the temperature of the liner drops to 45° C.