Method and circuit for controlling the charge of a bootstrap cap

Details Method and circuit for controlling the charge of a bootstrap cap Method and circuit for controlling the charge of a bootstrap cap

1997-07-17

2000-03-14

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323288, 323286, G05F 144

Patent

active

060377607

ABSTRACT:
A method of controlling the charging of a bootstrap capacitance incorporated into a switching regulator of a power transistor includes the steps of comparing, at each switching cycle, the voltage value at the bootstrap capacitance and a predetermined threshold voltage, to change the mode of operation of the regulator following said comparison. More particularly, the control on the transistor is taken off the regulator when the voltage at the bootstrap capacitance is lower than the threshold voltage, while the transistor is forced into the "on" state through a full cycle. In this way, the minimum current to operate the regulator can be minimised.

REFERENCES:
patent: 4521725 (1985-06-01), Phaneuf
patent: 4553082 (1985-11-01), Nesler
patent: 4587441 (1986-05-01), Torelli et al.
patent: 5365118 (1994-11-01), Wilcox
patent: 5408150 (1995-04-01), Wilcox
patent: 5627460 (1997-05-01), Bazinet et al.

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