AC voltage regulator delay overvoltage alarm circuit principle
As shown in the figure, the AC voltage regulator delay overvoltage alarm circuit. The alarm is mainly composed of a high voltage delay circuit, an overvoltage detection and alarm circuit, and an output control circuit. The output control circuit is composed of a thyristor SCR and relays J0 and D7. High-voltage delay circuit: time base circuit 555 and R7, C4, etc. form a delay oscillation circuit. When the AC power is connected, since the voltage on C4 cannot be abrupt, the voltage of the 2 pin is low. At this time, the 5553 pin outputs a high level, so that BG1 is turned on, the relay J0 is turned on, and the DC of the regulated source is turned off. high pressure. Due to the large capacity of C4, when it is charged for about 1 minute, when the voltage on it is greater than 1/3 VDD, the 5553 pin outputs a low level correspondingly, so that the BG1 tube is turned off. The contacts J0-1 and J0-2 of relay J0 are reset, the high voltage is turned on, and the green indicator light is on.
Overvoltage detection and alarm circuit: R10, W2, C6, IC2 (555) form a multivibrator. When the voltage of the overvoltage protection sampling signal taken out by the voltage divider (R1, W1, R2) exceeds a given value, the thyristor SCR is turned on, and J0 is pulled to disconnect the high voltage of the regulated power supply. At the same time, the BG1 tube is turned on, so that the power circuit of the 555 is turned on and generates oscillation. The oscillation frequency can be achieved by adjusting W2. The acoustic signal is emitted by the piezoelectric ceramic buzzer HTD.
The device has an overvoltage automatic protection function. When the AC voltage regulator is not working properly and the output voltage is too high, the alarm is automatically displayed and the high voltage is disconnected.
Standard Recovery Stud Diode are mainly used for rectifying and switching
It has positive pressure reduction (0.4v -- 1.0v), short reverse recovery time (2-10ns nanosecond), large reverse leakage current, low pressure resistance, generally lower than 150V, and is used in low voltage situations.
Diodes are electronic devices that have two electrodes that allow only a single current to flow in a single direction.Varicap bond (bond) is an electronic adjustable capacitor.Most diodes have a current orientation that we call reading "rectifier".The most common function of a diode is to allow only the current to pass in one direction (called forward bias) and to block in the opposite direction (called reverse bias).
Standard Recovery Stud Diode,Standard Recovery Diode,400V Standard Recovery Diode,Stud Diode
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