US 11,757,313 B2
Operating frequency based power level altering in extended range wireless power transmitters
Jason Green, Evanston, IL (US); Andrew Kovacs, Lafayette, IN (US); Mark Melone, Frankfort, IL (US); and Md Nazmul Alam, Lombard, IL (US)
Assigned to NuCurrent, Inc., Chicago, IL (US)
Filed by NuCurrent, Inc., Chicago, IL (US)
Filed on Jan. 31, 2022, as Appl. No. 17/588,531.
Application 17/588,531 is a continuation of application No. 16/863,682, filed on Apr. 30, 2020, granted, now 11,239,709.
Prior Publication US 2022/0231545 A1, Jul. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 50/80 (2016.01); H02J 50/12 (2016.01); H02J 50/70 (2016.01); H02J 50/50 (2016.01); H01F 38/14 (2006.01); H01F 27/28 (2006.01); H01F 27/36 (2006.01); H01F 27/24 (2006.01)
CPC H02J 50/80 (2016.02) [H01F 27/24 (2013.01); H01F 27/28 (2013.01); H01F 27/36 (2013.01); H01F 38/14 (2013.01); H02J 50/12 (2016.02); H02J 50/50 (2016.02); H02J 50/70 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A power transmitter for wireless power transfer at an operating frequency selected from an operating frequency range, the power transmitter powered by an external power supply, the power transmitter comprising:
a transmitter controller including a pulse width modulation (PWM) signal generator configured to determine and select the operating frequency from the operating frequency range, the transmitter controller configured to provide power control signals to the external power supply and control a power level of an alternating current (AC) power signal for transmission to a power receiver;
an inverter circuit configured to convert a direct current (DC) input power to the AC power signal;
a transmitter coil configured to transmit the AC power signal to the power receiver; and
wherein the external power supply is configured to generate the DC input power based on the power control signals and provide the DC input power to the inverter circuit, wherein the external power supply comprises:
a voltage regulator, and
a power supply controller configured to:
(i) receive the power control signals;
(ii) generate voltage regulation instructions for altering a DC voltage of the DC input power, wherein the voltage regulation instructions comprise one or more instructions to select the DC voltage of the DC input power, and wherein the DC voltage is selected from one or more preset DC voltage levels comprising a first DC voltage level that is electrically associated with a first AC power signal level and a second DC voltage level that is electrically associated with a second AC power signal level; and
(iii) provide the voltage regulation instructions to the voltage regulator to control the DC voltage of the DC input power, and
wherein a frequency shift is determined such that an alternating current (AC) output power level is greater than the first AC power signal level and less than the second AC power signal level.