Realization of high-power time-controlled voltage regulation

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As shown, the circuit includes a one-shot clock circuit. Time-controlled voltage regulation is performed by controlling the phase shift pulse.
ICl-a (1/2·556) and Rl, RPl, R2, R3, Cl, etc. constitute a monostable circuit. When the manual control button AN is pressed, IC1-a is set, and the output terminal 5 has high electrons. The temporary stabilization time is determined by the time from C1 charging to triggering the electronic 2/3Vdd, that is, Td1=0.693 (RP.1+R2) Ten R3) C1.IC1-a output control ICl-b (1/2·556) forced reset terminal l0 pin, IC1-b is in the wait trigger state during IC1-a output high level, and in IC1- During the output low period, the circuit is in the forced reset state. The trigger pin 8 of Icl-b is connected to the pulse synchronization signal synchronized with 50Hz. The monostable pulse width of IC1-b is much smaller than the temporary stability pulse width of IC1-a. Therefore, whenever the sync pulse comes, IC1-b is set by the last name, and the steady state (pulse width) is long by RP2, R4, C3 determines that td2=0.693 (RP2+R4)C3, ta2<<Td1. The output of lC1-b drives the high-power switch tube TWH8751, coupled via an isolation transformer, and the negative pulse is cut by D2 and D3. The positive pulse is used to send the SCR to control the conduction angle. The load voltage can be 10-210V. Changes within the scope. The conduction angle is controlled by RP2, which is the timing of the lower edge of the IC1-b steady state. The switch K2 is used to adjust the conduction angle of the thyristor. The adjustment is not affected by the monostable waveform of IC1-a. After adjustment, the switch back to the “time control” position.