Adaptive frequency jitter for controller
AssigneeInfineon Technologies AG
InventorsXiaowu Gong, Siu Kam Kok, Yaw Hann Thian
Life of this patent
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Abstract
In order to convert an input power to one or more DC power levels that are provided to an output load, some aspects of the present disclosure relate to techniques for driving a switching regulator as a function of a pulsed voltage signal. In particular, this pulsed voltage signal is provided substantially at a target frequency, but exhibits frequency jitter that causes the pulsed voltage to vary slightly from the target frequency in time. The frequency jitter has a frequency range that varies as a function of the output load.
Claims20
A method of power conversion that accounts for a time-varying characteristic of a load, comprising:
- comparing a feedback signal derived from an output signal to a reference signal, thereby providing an error signal indicative of a difference therebetween;
- providing an oscillating current signal based on the error signal;
- providing a pulsed voltage signal that exhibits frequency jitter based on the oscillating current signal, where the frequency jitter has a first frequency range while the load exhibits a first load condition and a second frequency range while the load exhibits a second load condition that differs from the first load condition.
An apparatus for driving a load, comprising:
- an input terminal to receive a DC supply signal;
- a switching regulator to regulate the DC supply signal as a function of a pulsed voltage signal and thereby provide a DC output voltage at an output terminal;
- a comparator to compare a feedback signal derived from the DC output voltage with a reference DC voltage, and to selectively generate an error signal based on the comparison;
- and
- control logic to provide the pulsed voltage signal substantially at a target frequency as a function of the error signal, the pulsed voltage signal exhibiting frequency jitter having a first frequency range while the load exhibits a first load condition and having a second frequency range while the load exhibits a second load condition that differs from the first load condition.
A method, comprising:
- sensing during a first time a first feedback voltage indicative of a first load condition and derived from a DC output signal;
- providing a pulsed voltage signal having a first jitter frequency range based on the first feedback voltage;
- sensing during a second time a second feedback voltage indicative of a second load condition that differs from the first load condition;
- updating the pulsed voltage signal to exhibit a second jitter frequency range based on the second feedback voltage, the second jitter frequency range differing from the first jitter frequency range.
Dependencies are inferred from the claim text.