Feedforward techniques using voltage integral duty-cycle control [for power convertors]

Two power convertor feedforward techniques (reset integral control and modulated integral control) based on the integral duty-cycle control concept are investigated. While retaining the performance features of the conventional voltage feedforward technique in terms of input harmonics and disturbance rejection these techniques also correct automatically the errors caused by switching losses. Modulated integral control is also capable of compensating for the effect of switching delays on the input. The attenuation of input source harmonics achieved by these two techniques is evaluated quantitatively. Design considerations are discussed, and experimental results on a 1 kW prototype confirm the feasibility and features of the proposed techniques