| 摘要 |
PURPOSE: To superpose an AC voltage only by the use of cheap parts such as diodes, resistors, capacitors, etc., by applying AC current capable of passing through a low-pass filter to a divided point of a smooth voltage generated by the low-pass filter. CONSTITUTION: A low-voltage DC signal is switching-controlled and converted into a low-voltage AC signal by a switching circuit 1. This low-voltage AC signal is boosted by a high-voltage transformer 2, and converted into a high- voltage AC signal. Furthermore, the high-voltage AC signal is rectified and smoothed by a rectifier circuit and a low pass filter 3 to obtain a high voltage DC signal. The high-voltage DC signal obtained by smoothing is divided by resistors R1 and R2 . The switching circuit 1 is controlled by a feedback circuit 5 so that the voltage at a voltage-divided point 4 by resistors R1 and R2 may be constant. And an AC power source 13 is provided for applying AC current having a frequency component capable of passing through a low-pass filter to the voltage divided point 4. Consequently, an AC superposed voltage can be obtained. |
