Patent ID: 6473317
Filing Date: 2002-10-29
Classification: H02M,Y02B

Abstract:
A forward DC/DC converter comprising:a first transformer defining an input winding with a first and a second input winding lead and a corresponding output winding with a first and a second output winding lead, a power source defining a first and a second terminal with the first terminal connected to the first input winding lead a switch connected between the second power source terminal and the second input winding lead, the switch defining an activation input, a pulse width modulator defining an output signal, a delay circuit accepting the output signal and providing a delayed output signal to the activation input, a second transformer with an input winding connected to receive the output signal, the second transformer providing a second transformer output signal winding, an inductor connected between the first output winding lead of the first transformer and a load, the load connected to a reference point, a first MOSFET source connected to the reference point and a drain to the second output winding lead of the first transformer, the first MOSFET completes the circuit from the inductor and the load through the output winding of the first transformer, the first MOSFET defining a first gate, a connection from the first output winding lead of the first transformer to the first gate, a second MOSFET source connected to the reference point and a drain connected to the first output winding lead, the second MOSFET connected across the inductor and the load wherein the second MOSFET completes a circuit, the second MOSFET defining a second gate, a diode with an anode connected to the drain of the first MOSFET and a cathode to the gate of the second MOSFET, the diode performing voltage peak detection and holding, the peak voltage driving the gate of the second MOSFET, a third MOSFET source connected to the reference point and a drain connected to the gate of the second MOSFET, the third MOSFET defining a third gate, and a connection from the second transformer output signal winding to the third gate.