Fixed frequency hysteretic regulator

Details Fixed frequency hysteretic regulator Fixed frequency hysteretic regulator

2005-04-26

2005-04-26

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

06885175

ABSTRACT:
A control circuit for controlling a hysteretic regulator to operate at substantially fixed frequency has a voltage offset circuit which receives a first feedback signal and generates a pair of upper and lower offset voltages; a control reference stage which receives a reference voltage and the upper and lower offset voltages and outputs upper and lower control reference voltages; and a window comparator which receives the upper and lower control reference voltages and an output voltage feedback signal and outputs a pair of upper and lower control voltages for controlling switching of the hysteretic regulator at a fixed frequency. The first feedback signal may be representative of a switching frequency, a temperature or an output voltage of the hysteretic regulator, for example. The voltage offset circuit may further receive a second and/or an additional feedback signal. The first, second and/or additional feedback signals further may be weighted. According to particularly useful embodiments of the invention, the control method for a hysteretic regulator may use both output voltage and switching frequency as primary feedback signals, thereby allowing the window limits (control voltages) to be positioned completely independently and in any possible configuration about the nominal voltage. In other words, the two window limits can be positioned symmetrically or asymmetrically about the nominal voltage, and at the same time the lower window limit can be positioned either below, above, or equal to the upper window limit.

REFERENCES:
patent: 3660753 (1972-05-01), Judd et al.
patent: 4392103 (1983-07-01), O'Sullivan et al.
patent: 4437146 (1984-03-01), Carpenter
patent: 4529927 (1985-07-01), O'Sullivan et al.
patent: 4929882 (1990-05-01), Szepesi
patent: 5345165 (1994-09-01), Froeschle
patent: 5734259 (1998-03-01), Sisson et al.
patent: 6147478 (2000-11-01), Skelton et al.
patent: 6348780 (2002-02-01), Grant
patent: 6433525 (2002-08-01), Muratov et al.
patent: 6456050 (2002-09-01), Agiman
patent: 6791306 (2004-09-01), Walters et al.
Analog Devices, Inc., Multiphase IMVP-IV Core Controller for Mobile CPUs ADP3205, pp. 1-24; www.analog.com, 2003.
Texas Instruments, Inc., TPS5211 High Frequency Programmable Hysteretic Regulator Controller, pp. 1-32, Sep., 1999.

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