Working principle: The circuit schematic of the device is shown in Figure 1. It consists of a mechanical timer and a stepless voltage regulator circuit. CZ1 is a socket for rice cookers. S is a function switch. When S is set to "1", the fire control circuit loses its function, and the rice cooker resumes the ordinary cooking function. When S is set to "2", the fire control circuit is turned on, and the rice cooker can be used for soup, Cook porridge, cook food, etc.
Stepless Piezoelectric Routing Triacs (SCRs, short for thyristor rectifiers), are four-layer high-power semiconductor devices with three PN junctions, also known as thyristors. It is one of the more commonly used semiconductor devices because of its relatively simple structure and strong function. It is widely used in various electronic devices and electronic products, and is used for controllable rectification, inverter, frequency conversion, voltage regulation, and no Contact switch, etc.) VS contactless control switch, 2CS bidirectional trigger diode, RP, R2, C phase shift network. By adjusting the resistance of the RP, different charging time constants can be obtained, thereby obtaining different conduction angles of the VS. The timer automatically turns off the power. R1, ZD, and HTD constitute a timing sound and light reporting circuit. When used for soup, according to the cooking experience of food, first turn the mechanical timer to a certain angle (if it takes 30 minutes), then the sound and light signal circuit is shorted by the timer switch, and then press the rice cooker. The switch adjusts the RP so that the voltage across the rice cooker can be steplessly varied from 60V to 220V. The voltage applied to the electric raft is different. To obtain different firepower, the soup will not overflow too much due to the firepower, and at the same time, it can save energy, and the soup tastes more delicious. When the timer expires, the timer switch contact is disconnected. At this time, a weak current flows through the signalling circuit, causing the sound and light to report, notifying the owner that the soup is ready. In actual use, the owner can record the amount of food in the pot, the size of the fire, the length of the timer, and form an experience value. After a period of time, you can be handy, so that you don't have to pay attention to the rice cooker for a long time, and you can eat it. food.
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