Design of electric blanket power saver circuit based on 555 timer
555 application: (1) constitute Schmitt trigger, used for TTL system interface, shaping circuit or pulse amplitude correction; (2) constitute a multivibrator, constitute a signal generation circuit; oscillation period: T = 0.7 ( R1+2R2)C; (3) constitutes a one-shot trigger for timing delay shaping and some timing switches. The 555 application circuit can be combined into one or more of these three methods to form various practical electronic circuits, such as timers, frequency dividers, pulse signal generators, component parameters and circuit detection circuits, and toy game machine circuits. , audio alarm circuit, power exchange circuit, frequency conversion circuit, automatic control circuit, etc.
As shown in Figure 18-16, the circuit consists of an AC buck rectifier circuit, a 555 oscillator, and a control circuit. 555 and R1, RP1, C3, etc. constitute an astable multivibrator, the oscillation period T=0.693 (R1+RP1)C3, the period of the graphic parameter is about 12 minutes, the duty ratio, the 3 feet are high level. The SCR triggers the conduction, and the electric blanket is energized and heated, and the LED is bright. During the low level of the 3 pin, the SCR is turned off and powered off.
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