Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Reexamination Certificate
2002-06-03
2003-11-18
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
C323S280000, C323S281000
Reexamination Certificate
active
06650093
ABSTRACT:
FIELD OF THE INVENTION
This invention generally relates to electronic systems and in particular it relates to an auxiliary boundary regulator that provides enhanced transient response.
BACKGROUND OF THE INVENTION
There are a number of ways to accomplish a voltage regulation function, but two are more commonly used: (1) a continuous-time analog regulator or switched mode power supply (SMPS) with a continuous-time control loop, and (2) a ‘hysteretic’ type of converter which simply responds to provide energy when the regulated output falls outside of a hysteretic window. The first type provides a tightly controlled, lowripple, output voltage, and in the case of the SMPS, a controlled operating frequency, but the transient response time is slow. A fast load or supply transient can send the output out of regulation limits before the control loop can respond. The second type has a large ripple voltage and uncontrolled frequency, but the response time is extremely fast.
One prior art device involves the use of a linear regulator to perform the boundary function about an SMPS main converter. Another prior art device involves using a similar fast recovery converter around the main converter, which is an SMPS.
SUMMARY OF THE INVENTION
A regulator circuit with an auxiliary boundary regulator that provides enhanced transient response includes: an upper comparator having a first input coupled to a feedback node and a second input coupled to a first reference voltage node; a lower comparator having a first input coupled to the feedback node and a second input coupled to a second reference voltage node; a first switching device having a control node coupled to an output of the upper comparator; a second switching device having a control node coupled to an output of the lower comparator; an inductor having a first end coupled to the first and second switching devices, and a second end coupled to an output node; and a feedback circuit coupled between the output node and the feedback node. This circuit provides a precise, quiet, linear regulator that provides a tightly regulated output with a fast regulator working in parallel to ensure that the output voltage stays within an acceptable boundary.
REFERENCES:
patent: 5608312 (1997-03-01), Wallace
patent: 5864227 (1999-01-01), Borden et al.
patent: 5966004 (1999-10-01), Kadanka
patent: 6201375 (2001-03-01), Larson et al.
patent: 6333623 (2001-12-01), Heisley et al.
patent: 6377033 (2002-04-01), Hsu
Baldwin Dave
Patel Sanmukh
Teggatz Ross E.
Brady III W. James
Riley Shawn
Stewart Alan K.
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