| 摘要 |
PURPOSE:To allow independent or simultaneous output of a high voltage and an intermediate voltage from multiple states by providing a feedback control circuit with one or more circuit having a switch for detecting a different voltage and providing a load circuit with one or more different intermediate voltage circuit having a switch. CONSTITUTION:Output voltage from the low voltage rectified output terminal 9 of the tertiary negative feedback low voltage winding 1c in a transformer 1 is divided by means of a resistor 10a and a voltage division circuit 10b which is set such that the voltage at a high voltage output terminal 5a is lower than the operation starting voltage of a high voltage load circuit 6 when switches 11b, 11d are turned OFF. Upon turn ON of the switch 11b, a voltage detecting circuit 11a is connected in parallel with the impedance of the voltage division circuit 10b to increase the output of a differential amplifier 12a. Consequently, the high voltage load circuit 6 is actuated and the switch 11d is turned ON to power up a voltage detection circuit 11c thus effecting the regulation of output voltage. Intermediate voltage load circuits 7b, 7e may be powered up arbitrarily by means of switches 7c, 7f. |
