The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 2006
Filed:
Jul. 24, 2003
Eddy Ying Yin Ho, Torrance, CA (US);
Yong LI, Torrence, CA (US);
Jun Honda, El Segundo, CA (US);
David C. Tam, Manhattan Beach, CA (US);
Toshio Takahashi, Rancho Palos Verdes, CA (US);
Eddy Ying Yin Ho, Torrance, CA (US);
Yong Li, Torrence, CA (US);
Jun Honda, El Segundo, CA (US);
David C. Tam, Manhattan Beach, CA (US);
Toshio Takahashi, Rancho Palos Verdes, CA (US);
International Rectifier Corporation, El Segundo, CA (US);
Abstract
A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.