| 摘要 |
PROBLEM TO BE SOLVED: To prevent oscillation in DC power supply without the decrease in control function of a constant current control circuit, by using a switch means for adding an output of an oscillation control circuit to an output of a signal selecting circuit for the constant current control circuit and a constant voltage control circuit. SOLUTION: When an oscillation component in DC current is over a given level with a power converter 41 in a forward transformer operation and an AND condition is satisfied, a switching circuit 82 is closed to generate an output signal from an oscillation control signal generating circuit 81 to an adder 75. When an oscillation magnitude in DC current is below a given level with power converter 42 in a forward transformer operation and a power converter 43 in an inverter operation, an output of the AND circuit 85 is zero and a switching circuit 82 is opened. At this time the output from the oscillation control signal generating circuit 81 is not fed to the adder 75 so as not to carry out the oscillation control. In addition, the oscillation in DC current can be controlled effectively without any influence on a normal current control system. |
