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Novel zero ripple DC current transformer design

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2 Author(s)
Li-Ling Lee ; Ind. Technol. Res. Inst., Hsinchu ; Tasy, C.-L.E.

A new circuit of DC ripple-free current transformer (DCCT) is proposed to achieve the high-accuracy, the high-speed, the high-reliability and the no hysteresis effect in sensing of current for power electronic applications. This DCCT consists of two phase (opposite phase) transistor-core-based multivibrators synchronized to clock pulses with built-in oscillators. In this paper, the operating principle and experimental results, both on static and dynamic characteristics are presented. Moreover, the response time of 2 μsec under 3 kHz of clock pulse is also reported

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )