UNINTERRUPTIVE POWER SUPPLY

Japanese Patent JP3279712

B2

PURPOSE: To obtain an uninterruptive power supply capable of easily balancing the output current of each rectifier regardless of the size of load by varying the current references of a current control circuit of the rectifier in response to the active component of the output voltage of an inverter.
CONSTITUTION: An inverter 12 is parallel operation-controlled so as to balance the output currents with other inverters by the operation of a parallel control circuit 141. Also, an output current of the inverter 12 is determined by the apparent power of a load but the output current of a rectifier is determined by the active power of the load, therefore, the active component of the output current of the inverter 12 detected through CT15 is detected by an active current detecting circuit 142, and the control is so performed that the operation level of a constant current control circuit 131 of a rectifier 11 is changed in response to the detected output. And the output current of the rectifier is controlled in response to the active component of the output current of the inverter for which the parallel operation is adopted to achieve the balance. As a result, the control is so performed that the balance of the output current of the rectifier can be achieved indirectly independently from the size of load.

Yoshiaki Miyazawa

JP8233793A

April 30, 2002

April 09, 1993

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Toshiba Corporation

H02J3/38; H02J9/06; H02M7/493; (IPC1-7): H02J3/38; H02J9/06; H02M7/48

JP327724A
JP583860A
JP4970152A
JP50156626A
JP5374240A

Hideaki Togawa

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