UNINTERRUPTIBLE POWER SUPPLY

摘要

PROBLEM TO BE SOLVED: To provide an uninterruptible power supply capable of changing a capacity while holding down an increase in cost and capable of improving a reliability.

SOLUTION: When gate pulses 10 using a main circuit unit 8a for one machine as an object are generated by a PWM circuit 7 and the gate pulses 10 are output to a gate adjusting circuit 13a, the gate pulses 10 are input to the gate adjusting circuits 13a to 13c respectively by successive relaying among the gate adjusting circuits 13a to 13c. The gate adjusting circuits 13a to 13c generate the gate pulses 10a to 10c so that the imbalanced output currents from the main circuit units 8a to 8c are corrected by adjusting the gate pulses 10 on the basis of the current informations 9a to 9c of the main circuit units 8a to 8c, and then output them to the main circuit units 8a to 8c.

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