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:
Sep. 04, 2012
Filed:
Nov. 18, 2010
Lap Chi David Leung, Hong Kong, HK;
Yat Tung Lai, Hong Kong, HK;
Chun Fai Wong, Hong Kong, HK;
Kam Hung Chan, Kowloon, HK;
Kwok Kuen David Kwong, Davis, CA (US);
Lap Chi David Leung, Hong Kong, HK;
Yat Tung Lai, Hong Kong, HK;
Chun Fai Wong, Hong Kong, HK;
Kam Hung Chan, Kowloon, HK;
Kwok Kuen David Kwong, Davis, CA (US);
Abstract
A motor driver circuit for driving the gate node of a high-side driver transistor to a boosted voltage from a charge pump draws little or no static current from the charge pump. The gate node is pulled to the boosted voltage by a p-channel pullup-control transistor that is driven by p-channel transistors that are pumped by capacitors that cut off current flow to ground from the charge pump. An n-channel output-shorting transistor shorts the gate node to the output when the high-side driver is turned off. A coupling capacitor initializes the shorting transistor for each output transition. A p-channel output-sensing transistor generates a feedback to a second stage that drives the coupling capacitor. P-channel diode transistors and an n-channel equalizing transistor control the voltage on the coupling capacitor.