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US 9,882,476 B2Granted
Method and apparatus for phase current estimation in semi-resonant voltage converters
AssigneeInfineon Tehnologies Austria AG
InventorAmir Babazadeh
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AssigneeInfineon Tehnologies Austria AG
InventorAmir Babazadeh
Estimating the term…
A resonant or semi-resonant voltage converter includes a synchronous rectification (SR) switch through which a current having a half-cycle sinusoidal-like shape is conducted when the SR switch is active. The current through the SR switch is modelled, and estimates of the SR switch current are generated by a digital estimator based on the model. The SR switch current estimates are updated at a fairly fast rate, as may be needed by a controller of the voltage converter. Analog converters are run at a slower rate, and generate error signals that are fed back into the digital estimator in order to improve future SR switch current estimates. Because the analog converters run at a fairly slow rate, power usage is minimal. However, the SR switch current estimates are updated at a rate that is fast enough to provide adequate control for the voltage converter.
A voltage converter that uses a variable switching frequency, the voltage converter comprising:
A method for current estimation in a variable-frequency voltage converter, the variable-frequency voltage converter including a synchronous rectification (SR) switch through which an SR current having a half-cycle sinusoidal-like shape is conducted when the SR switch is active, the method comprising, for each switching cycle of the variable-frequency voltage converter:
Dependencies are inferred from the claim text.