Patent ID: 6115266
Filing Date: 2000-09-05
Classification: H02M

Abstract:
A switching power source arrangement comprising a switching circuit for switching an input electric power to produce a switching output of intermittent pulse-like waveform, an output circuit for converting the switching output into a DC power output, and a digital control for controlling switching operation of said switching circuit in accordance with the output of the output circuit;characterized bysaid digital control being operative:to receive an output analogue signal corresponding to at least one of an output voltage and an output current from said output circuit and convert the output analogue signal into an output digital signal;to calculate a command value for determining at least one of a switching cycle time and on or off time of said switching circuit based on said output digital signal; and,to produce a control pulse based on said command value and apply the control pulse to said switching circuit to thereby control switching operation of the switching circuit;the conversion of said output analogue signal to said output digital signal in said digital control being performed in synchronism with the switching cycle in the switching operation of said switching circuit so that the conversion takes place at the same phase in the switching cycle.