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:
May. 15, 2007
Filed:
Oct. 30, 2003
Wen-shi Huang, Taoyuan County, TW;
Ming-shi Tsai, Taoyuan County, TW;
Cheng-chieh Liu, Taichung County, TW;
Tsung-jung Hsieh, Taipei County, TW;
Yuch-lung Huang, Miaoli County, TW;
Wen-shi Huang, Taoyuan County, TW;
Ming-shi Tsai, Taoyuan County, TW;
Cheng-chieh Liu, Taichung County, TW;
Tsung-jung Hsieh, Taipei County, TW;
Yuch-lung Huang, Miaoli County, TW;
Delta Electronics Inc., Taoyuan County, TW;
Abstract
A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The driving unit is connected with the digital/analog converting unit in series for receiving the voltage signal, while the driving unit provides a first predetermined voltage level and a second predetermined voltage level as references. The fan motor is kept to run with a low constant rotation speed when the voltage signal level is higher than the first predetermined voltage level, with a full constant rotation speed when the voltage signal level is lower than the second predetermined voltage level, and with a variable rotation speed when the voltage signal level is lower than the first predetermined voltage level and higher than the second predetermined voltage level.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile