| 摘要 |
PURPOSE:To perform the line regulation by a transducer of a small capacity with high accuracy by using the signal in the source of a control system to synthesize a waveform similar to the absolute value of a load voltage waveform. CONSTITUTION:The output of a voltage comparator 7 which decides a conduction angle has a square waveform and is differentiated by a differentiation circuit 8. This differential pulse gives conduction to a triac 10 through the secondary side of a pulse transformer PT to apply the AC voltage to a load. The output voltage of the comparator 7 which decides the time point of conduction is fed back to a TRQ1 of a generating circuit for signal corresponding to load voltage. The TRQ1 conducts at its rise to turn off a TRQ2. Then a signal having a voltage waveform corresponding to the conduction angle of the voltage supplied to a load 9 is sent to an effective value conversion circuit 12 to be converted into the effective value. Here the comparator 7 compares the sawtooth wave voltage with the output of the circuit 12 and delivers a square wave to control the conduction angle of the triac 10. |
