| 摘要 |
PURPOSE:To increase the efficiency and to reduce the noise of a power source circuit by switching a transistor, converting the output to a sinusoidal wave by a parallel resonator and further returning excess energy to a DC voltage source. CONSTITUTION:When a DC voltage source 10 generates an output voltage, the emitter voltage of a UJT60 rises in response to the time constant determined by a resistor 54 and a capacitor 56. When the emitter voltage reaches the prescribed value, the UJT60 is conducted, the charge charged in the capacitor 56 is discharged, a transistor 28 is conducted, and the UJT60 is interrupted. A circuit which has the transistor 28 as a center starts oscillating, and since a coil 20 and a capacitor 22 are a parallel resonator, a sinusoidal voltage is generated across the coil 20. The energy absorbed by the coil 26 is transmitted to the secondary winding 34, and returned through a reverse blocking diode 36 to the source 10. The nonconducting point of the transistor 28 is controlled by the difference between the output voltage of a rectifying the smoothing circuit 50 and a reference voltage. |
