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Multi-function refrigerator controller composed of 555

2015-01-29 22:48  
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Multi-function refrigerator controller composed of 555
The chart shows the multi-function refrigerator controller. The controller consists of over voltage, under voltage sampling circuit, delay-start circuit, sound and light alarm circuit, buck rectifier circuit. Buck rectifier circuit provides DC voltage for the entire controller. Delay start circuit consists of IC1 (555) and C6, R14, W3, etc, when turning on or getting power after power failure, the terminal voltage of C6 can not be mutated, 555 occurs resetting as pin ⑥ being in high potential, with the charging, C6 makes the potential of pin 2 be less than 1/3VDD, the 555 occurs setting, high output of pin③ makes the relay pull in. The corresponding delay is td = 1.1 (Rw3 + R14) C6, the icon corresponding delay parameter is about 4 to 10 minutes. Overvoltage, undervoltage and overcurrent detection, switch circuit consists of W1, R2, R3, DW1, BG1, BG2, BG3 and so on. When occurring overvoltage, undervoltage or over-flow, BG3 is off, its collector is in high potential, the potential is added to the pin ⑥ of IC1, and 555 resets, the low output of pin ③ makes the relay J release, contact J2-2 cut off, the power of the refrigerator cut off, while LED1 is lit; the other way, the partial pressure passing the R10, R1 added to the pin ④, of IC2, IC2 starts oscillation.