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Magnetic control of DC-DC resonant converters provides constant frequency operation

Magnetic control of DC-DC resonant converters provides constant frequency operation

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© The Institution of Engineering and Technology
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A solution to operate DC-DC resonant converters at constant frequency is proposed. A variable inductor is used to achieve output voltage control and regulation without changing the switching frequency of the converter. The output voltage characteristic of the parallel resonant converter operating under this so-called magnetic control is briefly analysed. A 48 V input, 5 V output, 500 kHz, 25 W prototype is presented to prove the feasibility of the proposed control method.

Inspec keywords: voltage control; resonant power convertors; power inductors; DC-DC power convertors

Other keywords: output voltage control; voltage 48 V; frequency 500 kHz; magnetic control; parallel resonant converter; switching frequency; variable inductor; power 25 W; DC-DC resonant converter; regulation; constant frequency operation

Subjects: Transformers and reactors; Power convertors and power supplies to apparatus; Power electronics, supply and supervisory circuits

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      • S. Ben-Yaakov , M. Peretz . A self-adjusting sinusoidal power source suitable for driving capacitive loads. IEEE Trans. Power Electr. , 4 , 890 - 898
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      • M. Perdigao , J.M. Alonso , E. Saraiva . Magnetically-controlled dimming technique with isolated output. Electron. Lett. , 14 , 756 - 758
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      • A.S. Kislovski . Quasi-linear controllable inductor. Proc. IEEE , 2 , 267 - 269
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      • J.M. Alonso , M.A. Dalla Costa , M. Rico-Secades , J. Cardesín , J. García . Investigation of a new control strategy for electronic ballasts based on variable inductor. IEEE Trans. Ind. Electron. , 1 , 3 - 10
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