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Stabilizing magamp control loop by using an inner-loop compensation

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4 Author(s)
Chao-Hwa Yang ; Nat. Taiwan Univ., Taipei, Taiwan ; Chen, D.Y. ; Jamerson, C. ; Yan-Pei Wu

Using an inner-loop compensation scheme, the order of the open-loop transfer function of a magamp control circuit is essentially reduced from two to one for a self-reset scheme. The problem normally associated with compensating a control transfer function with resonance peaking is thereby eliminated. Moreover, if the inner loop gain is designed high enough, the closed-loop gain can be insensitive to the variation of power circuit parameters such as saturable reactor permeability and capacitor equivalent series resistance (ESR). A design example is given to illustrate the step-by-step design procedure for a practical magamp control circuit. The results are verified by loop gain measurements

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Power Electronics, IEEE Transactions on  (Volume:6 ,  Issue: 3 )