Adaptive Hybrid Primary/Secondary-Side Digital Control for Series Resonant DC-DC Converters in 48 V VR Applications

In this paper, a current sensorless adaptive secondary-side control is proposed for the series resonant converter (SRC), making it a good candidate for MHz 48 voltage regulators. By means of varying ac equivalent resistance, the output voltage regulation is achieved by controlling the duty cycle of...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2015-06, Vol.3 (2), p.422-429
Main Authors: Shangzhi Pan, Pahlevaninezhad, Majid, Jain, Praveen K.
Format: Article
Language:English
Subjects:
Capacitors
Control systems
MOSFET
Rectifiers
Resistance
Voltage control
Zero voltage switching
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Summary:In this paper, a current sensorless adaptive secondary-side control is proposed for the series resonant converter (SRC), making it a good candidate for MHz 48 voltage regulators. By means of varying ac equivalent resistance, the output voltage regulation is achieved by controlling the duty cycle of the synchronous MOSFET. By taking advantage of the secondary-side control, SRCs can operate under zero-voltage switching at any input voltage and load conditions. A current sensorless adaptive digital control is proposed to control the current-type synchronous MOSFETs, which automatically compensates the delay caused by the current-sensor circuit and the gate driver, and also eliminates the current sensor in the power path. A hybrid control strategy is introduced to overcome the efficiency degradation caused by the secondary-side control.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2014.2320855