Full Text:   <1965>

CLC number: TN78; TM92

On-line Access: 

Received: 2007-12-10

Revision Accepted: 2008-03-10

Crosschecked: 0000-00-00

Cited: 0

Clicked: 3144

Citations:  Bibtex RefMan EndNote GB/T7714

-   Go to

Article info.
1. Reference List
Open peer comments

Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.8 P.1150~1156


A novel current-sharing scheme based on magamp

Author(s):  Wen-xi YAO, Xiao-yuan HONG, Zheng-yu LU

Affiliation(s):  School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   ywxi@zju.edu.cn

Key Words:  Current-sharing (CS), Magnetic amplifier (magamp), Parallel

Share this article to: More <<< Previous Article|

Wen-xi YAO, Xiao-yuan HONG, Zheng-yu LU. A novel current-sharing scheme based on magamp[J]. Journal of Zhejiang University Science A, 2008, 9(8): 1150~1156.

@article{title="A novel current-sharing scheme based on magamp",
author="Wen-xi YAO, Xiao-yuan HONG, Zheng-yu LU",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T A novel current-sharing scheme based on magamp
%A Wen-xi YAO
%A Xiao-yuan HONG
%A Zheng-yu LU
%J Journal of Zhejiang University SCIENCE A
%V 9
%N 8
%P 1150~1156
%@ 1673-565X
%D 2008
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0720112

T1 - A novel current-sharing scheme based on magamp
A1 - Wen-xi YAO
A1 - Xiao-yuan HONG
A1 - Zheng-yu LU
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 8
SP - 1150
EP - 1156
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0720112

The magamp (magnetic amplifier) is widely used in power supplies due to its low cost, simplicity and other advantages. This paper discusses a novel application of the magamp in switching power supplies, where the magamp is used to regulate pulse width modulation (PWM) instead of power signal in the main circuit. This method extends the application of the magamp in power supplies, and makes it possible to further regulate control signal when PWMs have been generated. Based on this application, a new current-sharing (CS) scheme using the magamp is proposed, which uses a modified inner loop CS structure. In this scheme PWMs are generated by one main controller, and CS is achieved by regulating PWMs using a magamp in each module. Compared with traditional application of the magamp, the new CS scheme can be used in most topologies and only requires magamps of low power capacity. Then a test circuit of parallel power supply is developed, in which CS is achieved by a PWM regulator with the magamp. The proposed scheme is also used to upgrade an electroplate power to make it capable of paralleling supplies. Experimental results show that the proposed scheme has good CS performance.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


[1] Chen, D.Y., Lee, J., Jamerson, C., 1989. A simple model predicts small-signal control loop behavior of magamp post-regulator. IEEE Trans. on Power Electr., 4(4):402-408.

[2] Chen, W., Han, J., Wen, C.C., 2002. Bi-directional Resetting Scheme of the Magamp Post-regulator. Proc. IEEE APEC, Dallas, TX, USA, 2:838-842.

[3] Chen, Y.T., Liang, J.M., 2006. Paralleling magamp postregulator modules with sliding-mode-control method. IEEE Trans. on Ind. Electr., 53(3):974-983.

[4] Hang, L.J., Gu, Y.L., Lu, Z.Y., Qian, Z.M., Xu, D.H., 2005. Magamp Post Regulation for LLC Series Resonant Converter with Multi-output. Proc. IECON, Raleigh, NC, USA, p.628-632.

[5] Huang, Y., Tse, C.K., 2007. Circuit theoretic classification of parallel connected DC-DC converters. IEEE Trans. on Circuits Syst. I: Fundam. Theory Appl., 54(5):1099-1108.

[6] Huber, L., Jovanovic, M.M., 1999. Small-signal modeling of nonideal magamp PWM switch. IEEE Trans. on Power Electr., 14(5):882-889.

[7] Irving, B.T., Jovanovic, M.M., 2000. Analysis, Design, and Performance Evaluation of Droop Current-sharing Method. Proc. IEEE APEC, New Orleans, LA, USA, 1:235-241.

[8] Jaber, A., Qahouq, A., Huang, L., 2007. Allan, Novel Current Sharing Schemes for Multiphase Converters with Digital Controller Implementation. Proc. IEEE APEC, Anaheim, CA, USA, p.148-156.

[9] Jovanovic, M.M, Crow, D.E., Lieu, F.Y., 1996. A novel, low-cost implementation of “democratic” load-current sharing of paralleled converter modules. IEEE Trans. on Power Electr., 11(4):604-611.

[10] Kim, J.W., Choi, H.S., Cho, B.H., 2002. A novel droop method for converter parallel operation. IEEE Trans. on Power Electr., 17(1):25-32.

[11] Lin, C.S., Chen, C.L., 2000. Single-wire current-share paralleling of current-mode controlled DC power supplies. IEEE Trans. on Ind. Electr., 47(4):780-786.

[12] Lin, W., Rinne, K., Lu, Z., Hua, G., 2005. A High Efficiency Gate-driver Scheme of Synchronous Rectifiers for Magamp Regulation Applications. Proc. IEEE APEC, Austin, TX, USA, 3:1478-1484.

[13] Luo, S.G., Ye, Z.H., Lin, R.L., Lee, F.C., 1999. A Classification and Evaluation of Paralleling Methods for Power Supply Modules. Proc. IEEE PESC, Charleston, SC, USA, 2:901-907. [doy.10.1109/PESC.1999.785618]

[14] Mao, H., Yao, L., Wang, C., Batarseh, I., 2007. Analysis of inductor current sharing in nonisolated and isolated multiphase DC-DC converters. IEEE Trans. on Ind. Electr., 54(6):3379-3388.

[15] Siri, K., Banda, J., 1995. Analysis and Evaluation of Current-sharing Control for Parallel-connected DC-DC Converters Taking into Account Cable Resistance. Conf. Record of IEEE Aerospace Applications Conf., p.29-48.

[16] Siri, K., Lee, C.Q., Wu, T.F., 1992a. Current distribution control for parallel connected converters: Part I. IEEE Trans. on Aerosp. Electr. Syst., 28(3):829-840.

[17] Siri, K., Lee, D.Q., Wu, T.F., 1992b. Current distribution control for parallel connected converters: Part II. IEEE Trans. on Aerosp. Electr. Syst., 28(3):841-850.

[18] Wen, C.C., Chen, C.L., 2005. Magamp application and limitation for multiwinding flyback converter. IEE Proc. Electr. Power Appl., 152(3):517-525.

Open peer comments: Debate/Discuss/Question/Opinion


Please provide your name, email address and a comment

Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - Journal of Zhejiang University-SCIENCE