| 摘要 |
PURPOSE:To obtain a downsized inexpensive output means or a low loss output means by comparing ON intervals of switching elements in respective converters thereby making uniform the output current being born by each converter. CONSTITUTION:A pulse width voltage converting circuit 16 receives pulse voltages from the secondary windings 7 of transformers 6 in converters A0, A1, at terminal (f) thereof, and produces a voltage corresponding to ON interval, i.e., a voltage corresponding to the output voltage, at terminal (g). Since a voltage corresponding the bearing current is applied on one end of a resistor 17 and a voltage averaged through two converters A0, A1 is applied on the other end of the resistor 17, a voltage corresponding to the difference of bearing output current appears across the resistor 17. A differential amplifier 18 amplifies the differential voltage and varies the reference voltage of an error amplifier 12 through a resistor 15 connected with the output of the differential amplifier 18. The differential amplifier 18 varies the output voltages of the converters A0, A1 so that the bearing current is made uniform. |
