Patent ID: 6608770
Filing Date: 2003-08-19
Classification: H02M,Y02B

Abstract:
An apparatus for controlling the current drawn from an AC input and delivering a DC voltage to a load, comprising:a bridge rectifier having a first and a second input for receiving power from the AC input, a positive output, and a negative output; two capacitances each having one plate connected to a center tap and one plate connected to a respective end tap; a first filter inductance connected in series between the positive output of the bridge rectifier and a first end tap; a second filter inductance connected in series between the negative output of the bridge rectifier and a second end tap; a range switch connected in series between the second input of the bridge rectifier and the center tap for doubling the output voltage when the switch is closed; the first and second end taps connected to feed the load; and wherein the first inductance is connected so that when it carries a current, the instantaneous value of the current equals the sum of the currents in the load and in the capacitance connected to the first end tap; and wherein the second inductance is connected so that when it carries a current, the instantaneous value of the current equals the sum of the currents flowing in the load and in the capacitance connected to the second end tap.