555 electric rice cooker automatic controller circuit

Published:2011/6/1 19:10:00 Author:TaoXi | Keyword: 555, electric, rice cooker, automatic controller | From:SeekIC

As the figure 15-31 shows, the controller is composed of the step-down voltage circuit (VDD=+12V), the R-S trigger circuit which is composed of 555 and the relay control circuit.etc. The R-S trigger is composed of the 555 and R5, R6, RP1, RT, R4, RP2, VT2. RT is the negative temperature coefficient thermistor. When the cooker is cooking the dry rice, the two-knife single-throw switch K1 closes. So the separate voltages of R5 and R6 make the pin-6 of 555 gets the voltage of 2/3VDD=8V, the voltage of pin-2 is the separate voltage of RP1, RT, RP2, the voltage value is less than 1/3VDD, so 555 sets, LED1 turns on and J1 closes.



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