Patent ID: 6828762
Filing Date: 2004-12-07
Classification: H02M

Abstract:
The switching regulator having an input coupled to a source of potential VIN and having an output providing an output potential V0 and an output current, comprising:a switching circuit having at least two controllable power switches, and at least two rectifier switches connected in series at a second node, said at least two controllable switches each having a control node, and said first rectifier switch and said second rectifier switch having control terminal; a transformer having at least one primary winding connected to said input via said at least two controllable power switches, and a first and a second secondary windings connected together in series at a first node and said first secondary windings connected to said first rectifier switch at a third node and said second secondary winding connected to said second rectifier switch at a fourth node and said first secondary winding and said second secondary winding having an inherent DC winding resistances; an output stage having an output stage input and an output stage output, said output stage input connected to said first node and said second node, said output stage output connected to a load circuit, said output stage input and said output stage output having a common node; an inductor for providing output current to said load circuit having a first terminal connected to said output stage input and a second terminal connected to said output stage output and an inherent DC resistance there between; a current sensor having a current sensor input and a current sensor output and said current sensor input connected to said third node and to said fourth node and said second terminal of said inductor, said current sensor comprising a first and a second resistor and a capacitor, said first resistor having a first and a second terminal, said second resistor having a first and a second terminal, said capacitor having a first and a second terminal, said first terminal of said first resistor connected to said third node and said first terminal of said second resistor connected to said fourth node, said second terminal of said first resistor connected to said second terminal of said second resistor and said first terminal of said capacitor at a fifth node, said second terminal of said capacitor connected to said second terminal of said inductor; said current sensor providing a sensed voltage at said current sense output proportional to the inductor's said output current and derived from the voltage drop across said inherent DC resistances of said inductor and said inherent DC winding resistances of said secondary windings; a control circuit having a modulator circuit for generating control pulses for a driver circuitry, said driver circuitry generating drive signals for said controllable power switches and said rectifying first rectifying and said second rectifier switch.