Rice cooker fire power controller circuit

Rice cookers are generally used to cook dry rice, such as making soup, porridge, and steaming food, but they cannot automatically "trip". Some foods that need to be cooked with "slow fire" cannot adjust the firepower, so the soup liquid is prone to overflow, which is neither It’s safe and wastes electricity. If an ordinary rice cooker is equipped with the fire power controller introduced here, its functions can be increased, bringing a lot of convenience to the user. working principle  　　

It consists of two parts: a mechanical timer and a stepless voltage regulation circuit. CZ1 is the socket for the rice cooker. S is the function switching switch. When S is dialed to "1", the fire power control circuit loses its function and the rice cooker resumes its normal cooking function; when S is dialed to "2", the fire power control circuit is turned on and the rice cooker can be used for making soup, Cook porridge, steam food, etc. The stepless voltage regulation circuit is composed of a triac VS contactless control switch, a 2CS bidirectional trigger diode, and a phase-shifting network of RP, R2, and C. By adjusting the resistance of RP, different charging time constants can be obtained, thereby obtaining different conduction angles of VS. The timer functions as an automatic power off. R1, ZD and HTD constitute a timing sound and light reporting circuit. When making soup, you can first turn the mechanical timer to a certain angle (for example, it takes 30 minutes) based on your food cooking experience. At this time, the sound and light alarm circuit is short-circuited by the timer switch and does not work, and then press the button on the rice cooker. Switch and adjust RP to make the voltage at both ends of the rice cooker change steplessly within the range of 60V-220V. Different voltages are applied to the electric cooker to obtain different firepower. The soup liquid will not overflow due to excessive firepower, and at the same time it can save electricity and make the soup taste more delicious. When the timer's predetermined time expires, the timer switch contact is disconnected. At this time, a weak current flows through the alarm circuit, causing a sound and light alarm to notify the owner that the soup is ready. In actual use, the owner can record the amount of food in the pot, the amount of firepower, and the timing to form experience values. After a period of time, the owner can be handy, so that he can eat the cooked rice without having to pay attention to the rice cooker for a long time. food. The component selection and production component list is shown in the table below. No. Name Model Quantity R1 Resistor 10K 1 R2 Resistor 4.7K 1 R3 Resistor 470Ω 1 RP Adjustable resistor 470K 1 C Polyester capacitor 0.15u/160V 1 2SC Bidirectional trigger diode DB－3 1 VS Triac 16A/600V 1 ZD Neon Tube 1 HTD Piezoelectric Buzzer 1 As long as the components are of good quality, this circuit can work normally without debugging. According to the data shown in the figure (table), this device can be used in various models of rice cookers below 1000W. Flexibly used, it can also be used for high-power dimming, electric fan speed adjustment, etc.