| 摘要 |
PROBLEM TO BE SOLVED: To simplify a current detector for taking the current balance of a parallel operation power unit, and increase the applicability. SOLUTION: This circuit is composed of resistors 11 and 12 which detect currents, being inserted into the junction where DC-DC converters 2 and 3 are connected in parallel, a differential voltage amplifier 13 which receives differential voltage within both ends of resistors 11 and 12, a level shift circuit 14 which applies the output voltage of the differential voltage amplifier 13 to the Vref of a level shift DC-DC converter 2, a lamp which receives the output voltage of the differential voltage amplifier 13 and discriminates between the positive and negative directions of the input voltage and shows the control direction, and an indicator 15 which produces an alarm at the limit of control. Then, the current balance is taken by varying the Vref by the differential voltage between the detected voltages V1 and V2 of the resistors 11 and 12. |
