Accurate voltage regulation of a primary-side regulation power supply in continuous conduction mode operation
First Claim
1. A method comprising:
- (a) generating multiple original voltage samples of a feedback-derived signal by sampling the feedback-derived signal during an OFF cycle of a power switch of a power converter, wherein the feedback-derived signal is indicative of an output voltage of the power converter;
(b) generating at least one voltage samples of a current-sense signal during an ON cycle of the power switch, wherein the current-sense signal is indicative of an output inductor current of the power converter;
(c) generating a calibrated feedback-derived voltage based on the multiple original voltage samples of the feedback-derived signal and said at least one voltage samples of the current-sense signal; and
(d) using the calibrated feedback-derived voltage to regulate the output voltage of the power converter.
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Abstract
A power converter operates in continuous conduction mode and outputs a regulated output voltage. A feedback-derived signal is used to regulate the output voltage. The feedback-derived signal is sampled at multiple time points during an OFF cycle of a power switch. A current-sense signal is also sampled at one or more time points during an ON cycle of the power switch. The current-sense signal is indicative of an output inductor current of the power converter. A calibrated feedback-derived voltage is then generated based on the multiple voltage samples of the feedback-derived signal and the one or more voltage samples of the current-sense signal. The calibrated feedback-derived voltage is less sensitive to an output inductor current loop resistance than the original voltage samples of the feedback-derived signal. The calibrated feedback-derived voltage also compensates for the nonlinearity of a diode of the output inductor current loop.
37 Citations
26 Claims
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1. A method comprising:
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(a) generating multiple original voltage samples of a feedback-derived signal by sampling the feedback-derived signal during an OFF cycle of a power switch of a power converter, wherein the feedback-derived signal is indicative of an output voltage of the power converter; (b) generating at least one voltage samples of a current-sense signal during an ON cycle of the power switch, wherein the current-sense signal is indicative of an output inductor current of the power converter; (c) generating a calibrated feedback-derived voltage based on the multiple original voltage samples of the feedback-derived signal and said at least one voltage samples of the current-sense signal; and (d) using the calibrated feedback-derived voltage to regulate the output voltage of the power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power converter, comprising:
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a power switch; a feedback circuit that generates a feedback-derived signal that is indicative of an output voltage of the power converter; a current-sense circuit that generates a current-sense signal that is indicative of an output inductor current of the power converter; and a multi-sample error function circuit (MSEFC), wherein the MSEFC generates multiple original voltage samples of the feedback-derived signal during an OFF cycle of the power switch, wherein the MSEFC generates at least one voltage samples of the current-sense signal during an ON cycle of the power switch, and wherein the MSEFC generates a calibrated feedback-derived voltage that is less sensitive to an output inductor current loop resistance than the original voltage samples of the feedback-derived signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A flyback converter comprising:
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an amplifier that amplifies a feedback voltage against a reference voltage and outputs a feedback error signal; and means for generating a calibrated feedback error voltage based on multiple original voltage samples of the feedback error signal, wherein the calibrated feedback error voltage is less sensitive to a secondary inductor current loop resistance than the original voltage samples of the feedback error signal, and wherein the flyback converter is operable in continuous conduction mode (CCM). - View Dependent Claims (24, 25, 26)
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Specification