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:
Feb. 16, 2021
Filed:
Jan. 11, 2018
Apple Inc., Cupertino, CA (US);
Nan Liu, Sunnyvale, CA (US);
Rohan Dayal, Daly City, CA (US);
Weihong Qiu, San Ramon, CA (US);
Zaki Moussaoui, San Carlos, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A wireless power system may use a wireless power transmitting device to transmit wireless power to a wireless power receiving device. The wireless power transmitting device may have an array of coils that extend under a wireless charging surface. Control circuitry may supply alternating-current control signals to inverters. The inverters are coupled to resonant circuits. Each resonant circuit includes a capacitor coupled to a respective one of the coils. During operation, wireless power signals are transmitted from the coils to the wireless power receiving device through the charging surface. The capacitor associated with each resonant circuit may potentially be individually selected to enhanced uniformity of the wireless power transmitting device. The array of coils may have multiple layers and the capacitors in each layer may have different respective values.