Power converter with digital signal processor

摘要

An up-converter ( 100 ) comprises: an inductor ( 5 ) and a diode ( 6 ) connected in series with an output ( 3 ); a capacitor ( 8 ) connected in parallel to said output; a controllable switch ( 7 ) having one switch terminal coupled to a node between the inductor and the diode. A control method comprises the steps of feeding the inductor with a rectified AC voltage (V_i); and generating a switch control signal (S_C) having a pulse width (T_H), for switching the switch open and closed; wherein the switch control signal is generated on the basis of the output voltage (Vo) at said output ( 3 ). According to the invention, the up-converter comprises a digital processor ( 110 ) which samples the output voltage (Vo), and digitally processes the sampled output voltage (V_o) to calculate the pulse width (TH) of the switch control signal (S_C) such that the output voltage (V_o) remains substantially constant.