Method and system for polarity independent step-up converter capable of operating under ultra-low input voltage condition

摘要

Apparatus and method for a polarity independent step-up converter capable of operating with ultra low input voltage. The step-up converter as disclosed herein receives an input source having a variable polarity and includes a first core circuit coupled to the input source and an output of the step-up converter and a second core circuit coupled to the input source and the output of the step-up converter. The first core circuit is configured to be active for a first input voltage polarity to output a first step-up voltage and the second core circuit is configured to be active for a second input voltage polarity to output a second step-up voltage.

主权项

1. A voltage step-up converter comprising:
an input source having a variable polarity; a single step-up transformer including a primary winding and two secondary windings, wherein the primary winding is coupled to the input source; a first depletion mode transistor coupled at its first terminal to the input source and at its second terminal to a reference point; and a second depletion mode transistor coupled at its first terminal to the primary winding and at its second terminal to the reference point; a coupling capacitor between the first depletion mode transistor and a second winding of the secondary winding; and a second coupling capacitor between the second depletion mode transistor and a first winding of the secondary winding, wherein the step-up converter is polarity independent.