| 摘要 |
PURPOSE:To obtain a frequency-divided AC current by rectifying an AC voltage to charge an integration circuit, using the voltage as the phase shift of an AC waveform and a steep rising circuit and conducting a main current circuit control thyristor. CONSTITUTION:A voltage delayed by a proper phase with a phase shift circuit comprising a resistor R2 and a capacitor C2 from an AC power supply AC is fed to a base of a transistor T via a resistor R3. A DC power of the transistor T is obtained by an integration circuit from a series resistor R1 to a capacitor C via a diode D and the voltage rises stepwise. When the voltage reaches a value, an output voltage of the transistor T is fed to a gate pf a thyristor SCR1 via a variable resistor VR to conduct it and a current flows to a load Z. When the current flows to the main current circuit, a voltage is generated across a resistor R6 connected in parallel with diodes D1, D2 to conduct a discharge thyristor SCR2 and the electric charge in the capacitor C is discharged. Then the circuit restores to the initial state and the main current circuit is acted intermittently. |
