US 11,944,176 B2
Modulation techniques for prolonging battery life in a battery-powered hair dryer
Ryan Goldman, San Diego, CA (US); Jonathan Friedman, San Diego, CA (US); and Zachary Rattner, San Diego, CA (US)
Assigned to SPUR CONCEPTS INC., San Diego, CA (US)
Filed by Spur Concepts Inc, San Diego, CA (US)
Filed on Oct. 28, 2020, as Appl. No. 17/083,219.
Application 17/083,219 is a continuation in part of application No. 15/663,735, filed on Jul. 29, 2017, granted, now 10,021,952.
Application 15/663,735 is a continuation in part of application No. 15/660,601, filed on Jul. 26, 2017, granted, now 10,405,630.
Claims priority of provisional application 62/368,962, filed on Jul. 29, 2016.
Prior Publication US 2022/0022621 A1, Jan. 27, 2022
Int. Cl. A45D 20/12 (2006.01); H02J 7/00 (2006.01)
CPC A45D 20/12 (2013.01) [H02J 7/0049 (2020.01); H02J 7/0063 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A battery-operated hair dryer, comprising:
a heating element positioned within an air flow channel; and
control circuitry coupled to the heating element and powered by at least one battery, the control circuit having an algorithm configured to determine the battery state-of-charge in real-time, calculate the remaining battery life before depletion, and determine a power mode setting to alter the power to the heating element to maximize the remaining battery life, and alter the power to the heating element for the power mode setting including multiple steps of power reduction;
wherein the multiple steps include 100% or full power to the heating element until the algorithm calculates that there is 4 minutes (of full-power) of battery life remaining, the power is then stepped down to 50% power until the algorithm calculates that there is about 45 seconds (of full-power) battery life remaining, and the power to the heating element is stopped and the hair dryer switches to cool shot to blow air until the battery is depleted.