Multi-threshold multi-gain active transient response circuit and method for digital multiphase pulse width modulated regulators
First Claim
1. In a multiphase pulse-width modulated voltage regulator system providing synchronous pulse width modulated pulses for regulating voltage at a load, a method of detecting deviations from a pre-determined output voltage level comprising the steps of:
- setting a threshold at which a deviation from the pre-determined voltage level in a first direction is detected;
setting multiple thresholds at which deviations from the desired voltage in a second direction are detected;
detecting when one or more of the multiple thresholds has been exceeded; and
providing an output that is adjusted in accordance with the number of multiple thresholds that have been exceeded wherein providing the adjusted output comprises;
detecting a current at an output stage of the pulse-width modulated voltage regulator system;
providing the detected current to a filter; and
adjusting, a bandwidth of the filter when detecting that one or more of the multiple thresholds has been exceeded.
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Abstract
Disclosed is a multi-phase pulse width modulated voltage regulator and method in which transient voltage excursions or deviations that exceed the load line voltage by more than a pre-determined amount are detected by an ATR circuit and a correction signal is applied. The correction signal is in the form of asynchronous pulses and the number of such pulses is a function of the magnitude of the voltage excursion as determined by the number of thresholds that are exceeded. Also disclosed is an adaptive voltage positioning (AVP) circuit and method for early detection of a transient event by sensing voltage changes at the load and adjusting the target voltage with pre-determined current values prior to the time that ATR event changes in the current at the load are detected.
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Citations
13 Claims
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1. In a multiphase pulse-width modulated voltage regulator system providing synchronous pulse width modulated pulses for regulating voltage at a load, a method of detecting deviations from a pre-determined output voltage level comprising the steps of:
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setting a threshold at which a deviation from the pre-determined voltage level in a first direction is detected; setting multiple thresholds at which deviations from the desired voltage in a second direction are detected; detecting when one or more of the multiple thresholds has been exceeded; and providing an output that is adjusted in accordance with the number of multiple thresholds that have been exceeded wherein providing the adjusted output comprises; detecting a current at an output stage of the pulse-width modulated voltage regulator system; providing the detected current to a filter; and adjusting, a bandwidth of the filter when detecting that one or more of the multiple thresholds has been exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification