| 摘要 |
PROBLEM TO BE SOLVED: To lessen a transistor insertion loss of a series regulator circuit by inserting a circuit of a diode, a capacitor, and a resistor which rectifies the voltage waveform at a connection between a DC-AC inverter circuit and a choke coil and then supplies base current to a transistor of the series regulator circuit. SOLUTION: A transistor 3, a resistor 4, and a Zener diode 5, which constitute a series regulator circuit, are connected to an input power line of a DC-AC inverter circuit 1. As the base current of the transistor 3 of the series regulator circuit 3, the voltage obtained by rectifying the AC voltage at the connection between the DC-AC inverter circuit 1 and a choke coil 2 by a diode 10 and a capacitor 11 is supplied to the series regulator circuit through a resistor 12. By this method, the effect by the voltage between the base and the emitter of the transistor 3, which has been inevitably appearing as an insertion loss of the series regulator circuit in conventional circuits, can be neglected. |
