Abstract
A novel control algorithm for an active power conditioner (APC) is proposed. The operation of this APC can be divided into two modes: active power filter mode and back-up power mode. When the mains are normal, the proposed APC operates in the active power filter mode that provides the functions of active power filter and battery charger. Once the mains have failed, the proposed APC operates in the back-up power mode to supply power to the demands. In this circuit design, the control circuit is suitable for both operation modes except in the arrangement of feedback signals. Hence, the design cost can be reduced; also, no load current sensor is used in the circuit. The practicality of the method is, therefore, further enhanced.
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