Synthetic ripple regulator with frequency control
First Claim
1. A synthetic ripple regulator which converts an input voltage to a regulated output voltage and which includes frequency control based on a fixed frequency reference clock, said synthetic ripple regulator comprising:
- an error network providing an error signal indicative of relative error of the output voltage;
a ripple detector which provides a ramp control signal based on the input and output voltages and a pulse control signal;
a combiner which adjusts said ramp control signal based on a frequency compensation signal to provide an adjusted ramp control signal;
a ripple generator which develops a ripple control signal based on said adjusted ramp control signal;
a comparator network which develops said pulse control signal to control switching based on said error signal and said ripple control signal at a frequency that varies in response to load transients; and
a phase comparator which compares said pulse control signal with the reference clock and which provides said frequency compensation signal indicative thereof to control steady-state operating frequency of the synthetic ripple regulator by adjusting said ramp control signal to adjust said frequency of said pulse control signal towards the fixed frequency of the reference clock.
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Accused Products
Abstract
A synthetic ripple regulator including frequency control based on a reference clock. The regulator includes an error network, a ripple detector, a combiner, a ripple generator, a comparator network and a phase comparator. The error network provides an error signal indicative of relative error of the output voltage. The ripple detector provides a ramp control signal based on the input and output voltages and a pulse control signal. The combiner adjusts the ramp control signal based on a frequency compensation signal to provide an adjusted ramp control signal. The ripple generator develops a ripple control signal based on the adjusted ramp control signal. The comparator network develops the pulse control signal to control switching based on the error signal and the ripple control signal. The phase comparator compares the pulse control signal with the reference clock and provides the frequency compensation signal.
88 Citations
20 Claims
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1. A synthetic ripple regulator which converts an input voltage to a regulated output voltage and which includes frequency control based on a fixed frequency reference clock, said synthetic ripple regulator comprising:
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an error network providing an error signal indicative of relative error of the output voltage; a ripple detector which provides a ramp control signal based on the input and output voltages and a pulse control signal; a combiner which adjusts said ramp control signal based on a frequency compensation signal to provide an adjusted ramp control signal; a ripple generator which develops a ripple control signal based on said adjusted ramp control signal; a comparator network which develops said pulse control signal to control switching based on said error signal and said ripple control signal at a frequency that varies in response to load transients; and a phase comparator which compares said pulse control signal with the reference clock and which provides said frequency compensation signal indicative thereof to control steady-state operating frequency of the synthetic ripple regulator by adjusting said ramp control signal to adjust said frequency of said pulse control signal towards the fixed frequency of the reference clock. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic device, comprising:
a synthetic ripple regulator which converts an input voltage to a regulated output voltage and which includes frequency control based on a fixed frequency reference clock, wherein said synthetic ripple regulator comprises; an error network providing an error signal indicative of relative error of the output voltage; a ripple detector which provides a ramp control signal based on said input and output voltages and a pulse control signal; a combiner which adjusts said ramp control signal based on a frequency compensation signal to provide an adjusted ramp control signal; a ripple generator which develops a ripple control signal based on said adjusted ramp control signal; a comparator network which develops said pulse control signal to control switching based on said error signal and said ripple control signal at a frequency that varies in response to load transients; and a phase comparator which compares said pulse control signal with said reference clock and which provides said frequency compensation signal indicative thereof to control steady-state operating frequency of said synthetic ripple regulator by adjusting said ramp control signal to adjust said frequency of said pulse control signal towards said fixed frequency of said reference clock. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of controlling steady-state switching frequency of a synthetic ripple regulator based on a fixed frequency reference clock, wherein the synthetic ripple regulator converts an input voltage to a regulated output voltage, the method comprising:
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determining an error of the output voltage and providing a compensation signal indicative thereof; developing a window signal with upper and lower limits using the compensation signal; generating a ramp signal based on a difference between the input and output voltages when a pulse control signal is asserted high and based on the output voltage when the pulse control signal is asserted low; providing a frequency compensation value based on comparing the pulse control signal and the reference clock; adjusting the ramp signal based on the frequency compensation value and providing an adjusted ramp signal to adjust a frequency of the pulse control signal towards the fixed frequency of the reference clock; converting the adjusted ramp signal to a ripple signal; and comparing the ripple signal and the window signal and providing the pulse control signal indicative thereof at a frequency that varies in response to load transients. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification