| 摘要 |
PURPOSE:To suppress transient variation of output current without reducing the response frequency of a control loop by superposing the detected result of input voltage to the detected result of output current and changing the frequency of AC in accordance with the superposed result. CONSTITUTION:An error amplifier AMP2 compares the input voltage with reference voltage E2 and generates an output corresponding to the error voltage. An adder ADD generates an output obtained by adding the output of the error amplifier AMP1 to the output of an amplifier AMP2 and a voltage/frequency converter V/f generates an AC signal having the frequency corresponding to the output of the adder ADD and supplies the signal to an inverter INV. Receiving the AC signal, the inverter INV generates an AC output. Since the voltage drop of a resonance coil L1 and a resonance capacitor C1 is changed by changing the frequency of the AC output generated from the inverter INV, DC current generated in a load resistor RL can be kept constant. |
