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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

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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.

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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
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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.

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