Patent ID: 8699242
Filing Date: 2014-04-15
Classification: H02M,Y02B

Abstract:
1. A synchronous DC to DC converter circuit for converting an input DC voltage to an output DC voltage, the synchronous DC to DC converter circuit comprising: a two-stage DC input source for supplying DC input voltage, a first stage configured to supply high current for regulation to an electrical load, a second stage electromagnetically coupled to the first stage and configured to supply low current for FET bias and logic circuits; a control FET having a source, drain and gate, the gate functioning to control a flow of power from the drain to the source, wherein the source is connected to the electrical load; a comparator having positive and negative inputs and an output, wherein the output provides an alternating input control signal to the gate of the FET; means for providing a reference voltage to the negative input of the comparator; a voltage reset circuit for resetting the negative input of the comparator comprising a resistor and diode coupled to the second stage of the two-stage DC input source and the negative input of the comparator, wherein the voltage reset circuit resets the voltage on the negative input of the comparator each time a second stage voltage reverses direction; means for providing a peak charge voltage to the positive input of the comparator; and means for providing a bias current to the drain on the FET.