Patent ID: 6963498

Claim:
A bootstrap capacitor charging circuit comprising: first and second power switching transistors arranged in a half bridge arrangement such that the first and second transistors are disposed between a high side potential and a low side potential; a driver circuit for driving the first and second transistors; a bootstrap capacitor adapted to be charged from a potential source and for providing a voltage source to power an electronic circuit; a charging circuit providing a charging path from one of said high and low side potentials to said bootstrap capacitor; first and second series connected switches arranged between a common node of said first and second transistors and one of said high and low side potential; the bootstrap capacitor having a first terminal coupled to be charged by said charging circuit and a second terminal coupled to a common node between said first and second series connected switches; and a control circuit operating in first and second modes, wherein in a first mode when said first and second power switching transistors are switching at a rate above a predetermined frequency, a first of said switches connected to said common node of said first and second power switching transistors is controlled on and said second switch is controlled off; and wherein; when said first power switching transistor is on for a duration of time exceeding a preset duration, said control circuit operates in a second mode wherein said first and second switches are alternately turned on and off for first and second predefined periods of time whereby the bootstrap capacitor charges through said second switch and said charging circuit during the second predefined period of time.