Active EMC filter for machine tools

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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C327S100000, C363S037000

Reexamination Certificate

active

07629836

ABSTRACT:
An active EMC filter for machine tools allows reducing the leakage current normally induced by large phase-to-ground capacitances. The filter may comprise an active shunt module or an impedance converter or a correction signal generator and is suitable both for three-phase and single-phase applications.

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Quian Zhaoming et al., “Status of electromagnetic compatibility research in power electronics,” The Third International Power Electronics and Motion Control Conference, Aug. 15-18, 2000, IEEE, vol. 1, Aug. 15, 2000, pp. 46-57.
I. Takahashi et al., “Active EMI filter for switching noise of high frequency inverters,” Power Conversion Conference, Nagaoka, Japan, Aug. 3-6, 1997, IEEE, vol, 1, Aug. 3, 1997, pp. 331-334.

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