555 electric rice cooker automatic power regulator circuit

Published:2011/6/1 19:21:00 Author:TaoXi | Keyword: 555, electric rice cooker, automatic, power regulator | From:SeekIC

As the figure 15-30 shows, the regulator is composed of the step-down rectifier circuit (VDD=13V), the oscillation control circuit and the silicon controlled phase shifting trigger circuit. When the switch K is at the strong fire position, the VT2 cuts off, the contact point J1-1 is in the NC connection state, at this time R1 is in parallel with the RP1 and R2, and the RC trigger network is composed of the R1 and C1, after the SCR is conducted, the socket can get the 220V voltage. When the water is boiled, you dial the switch K to the mini fire position, the temperature sensor VT1 (3AX31) is in the heat conduction state, the pin-2 of 555 has the low electrical level, so the 555 sets, pin-3 has the high electrical level, VT2 conducts, J closes and J1-1 releases.



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