Right half-plane zero compensation and cancellation for...

Details Right half-plane zero compensation and cancellation for... Right half-plane zero compensation and cancellation for...

2007-11-20

2007-11-20

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

11380364

ABSTRACT:
An improved method of canceling a RHPZ of a switching regulator can include detecting a predetermined error signal provided to a pulse width modulation (PWM) circuit, wherein the predetermined error signal is associated with the RHPZ. Once a RHPZ is detected, a ramp waveform provided to the PWM circuit can be temporarily lengthened, thereby canceling the RHPZ. Notably, temporarily lengthening the ramp waveform can be based on adjusting an RZ*CZ time constant. In one embodiment, the ramp waveform can be lengthened to create a left half-plane zero (LHPZ), which improves stability.

REFERENCES:
patent: 4774478 (1988-09-01), Taylor
patent: 5204639 (1993-04-01), Moore et al.
patent: 6252383 (2001-06-01), Wittenbreder
patent: 6522115 (2003-02-01), Greitschus
patent: 6914476 (2005-07-01), Ingino, Jr.
patent: 2006/0176098 (2006-08-01), Chen et al.
patent: 2007/0030074 (2007-02-01), Ritter

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