High performance control of the series–parallel resonant converter

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High performance control of the series–parallel resonant converter

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The authors describe the operation, characteristics and design of a two-loop control technique for a MHz-switching series–parallel resonant converter. A resonant current feedback loop is used to determine the transistor switching instants resulting in the fourth-order converter characteristics becoming third order and, furthermore, being insensitive to operating conditions. The technique exploits the inherent delays in MHz-switching converter systems to provide well-damped dynamics. An output voltage control loop bandwidth of 100 kHz is achieved.

Inspec keywords: control system analysis; switching circuits; power semiconductor switches; control system synthesis; resonant power convertors; voltage control; power transistors

Other keywords: fourth-order power converter characteristics; 100 kHz; high-performance control; output voltage control loop bandwidth; series-parallel resonant power converter; MHz-switching; transistor switching; resonant current feedback loop

Subjects: Control of electric power systems; Power convertors and power supplies to apparatus; Voltage control; Control system analysis and synthesis methods; Power electronics, supply and supervisory circuits

References

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      • R. Oruganti , T.C. How . Resonant-tank control of parallel resonant converter. IEEE Trans. , 2 , 127 - 134
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      • G.C. Verghese , M.E. Elbuluk , J.G. Kassakian . A general approach to sampled-datamodelling for power electronic circuits. IEEE Trans. , 2 , 76 - 89
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      • A.K.S. Bhat , S.B. Dewan . Analysis of a high-frequency resonant converter usingLCC-type commutation. IEEE Trans. , 4 , 291 - 300
    4. 4)
      • A.J. Forsyth , Y.K.E. Ho . Dynamic characteristics and closed-loop performance ofthe series–parallel resonant converter. IEE Proc. B , 5 , 345 - 353
    5. 5)
      • Oruganti, R., Lee, F.C.: `Resonant power processors : part II — methods of control', Proceedings of the IEEE-IAS conference, 1984, p. 868–878.
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