Analysis and design of an LCL-T resonant converter as a constant-current power supply

An LCL-T resonant converter (LCL-T RC) is shown to behave as a current source when operated at resonant frequency. A detailed analysis of the LCL-T RC for this property is presented. Closed-form expressions for converter gain, component stresses, and the condition for converter design optimized for minimum size of resonant network is derived. A design procedure is illustrated with a prototype 200-W 20-A current-source power supply and experimental results are presented. The LCL-T RC as a current source offers many advantages such as easy parallel operation and low circulating currents at light load. Additionally, with appropriate phase shift in paralleled modules, the peak-peak ripple in output current is reduced and the ripple frequency is increased, reducing filtering requirements. The leakage inductance of a transformer can be advantageously integrated into the resonant network. These merits make the topology applicable in various applications such as magnet power supply, capacitor charging power supply, laser diode drivers, etc.

[1]  G. Ivensky,et al.  Application of integrated magnetics in resonant converters , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.

[2]  Fred C. Lee,et al.  Integrated magnetic for LLC resonant converter , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[3]  Yoichi Hori,et al.  Novel half-bridge resonant converter topology realized by adjusting transformer parameters , 2002, IEEE Trans. Ind. Electron..

[4]  V. Vorperian,et al.  A complete DC analysis of the series resonant converter , 1982, 1982 IEEE Power Electronics Specialists conference.

[5]  Takamasa Hori,et al.  Performance and Design of an L-C-L Converter for Voltage Regulator Type Applications , 1999 .

[6]  Hisaichi Irie,et al.  Immittance converters suitable for power electronics , 1998 .

[7]  M. M. Swamy,et al.  Analysis and design of a high frequency parallel resonant converter operating above resonance , 1988, APEC '88 Third Annual IEEE Applied Power Electronics Conference and Exposition.

[8]  H. Seidel.  A high power factor tuned Class D converter , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.

[9]  R. M. Nelms,et al.  A capacitor-charging power supply using a series-resonant topology, constant on-time/variable frequency control, and zero-current switching , 1991 .

[10]  M. Duffy,et al.  New method for integration of resonant inductor and transformer-design, realisation, measurements , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[11]  H. Pollock,et al.  Simple constant frequency constant current load-resonant power supply under variable load conditions , 1997 .

[12]  R. Severns.  Topologies for three element resonant converters , 1990, Fifth Annual Proceedings on Applied Power Electronics Conference and Exposition.

[13]  Robert L. Steigerwald,et al.  High-Frequency Resonant Transistor DC-DC Converters , 1984, IEEE Transactions on Industrial Electronics.

[14]  Issa Batarseh,et al.  Resonant converter topologies with three and four energy storage elements , 1994 .

[15]  A. K. S. Bhat,et al.  Analysis and design of LCL-type series resonant converter , 1990, 12th International Conference on Telecommunications Energy.

[16]  J.M. Burdio,et al.  Unipolar voltage-cancellation control of resonant inverters for induction cooking appliances , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[17]  Sandra McLain.  IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2007 .

[18]  R. Steigerwald,et al.  A comparison of half-bridge resonant converter topologies , 1987, 1987 IEEE Applied Power Electronics conference and Exposition.