| 摘要 |
PURPOSE:To reduce the fluctuation of output voltage by a method wherein an output voltage is controlled by means of a signal of deviation between output voltage and set up voltage as well as a signal of differential value of an input voltage. CONSTITUTION:The fluctuation of input voltage into inverter circuit 5 is detected by means of detecting a current flowing into a smoothing condenser 4 connected to input of the inverter 5 by a current transformer 20. The output from the current transformer 20 is input into a voltage error amplifying circuit 16 through the intermediary of a current amplifying circuit 21. The voltage error amplifying circuit 16 is supplied with the output from reference voltage generating circuit 17 and voltage detecting circuit 15. A phase control circuit 12 is supplied with the output of said voltage error amplifying circuit 16 controlling output pulse width of the inverter circuit 5. |
