| 摘要 |
PURPOSE:To increase both speed of response as well as accuracy of output electric power for a constant voltage circuit which sets an ON time of a transistor and then supplies the constant voltage to a load, by setting the ON time of the transistor by the output of the 2nd comparing/amplifying means. CONSTITUTION:The voltage supplied to a load RL is detected by a voltage detecting circuit 7 and delivered to a differential amplifier 10 to be compared with the reference voltage E0. Then this differential is amplified and delivered to a differential amplifier 9. The amplifier 9 compares the voltage supplied from the amplifier 10 with the voltage to be applied to a resistance R2, and this differential is amplified and delivered to a pulse width control circuit 8. The circuit 8 sets by the output of the amplifier 9 the time width to be applied to the voltage of a transistor Q. As a result, an unstable state never occurs to a feedback system having an order delay element with a high level secured for the gain. Therefore the overall gain of the circuit can be increased. |
