US 12,296,495 B2
Small electrical appliance with protective circuit
Thomas Verstege, Frankfurt AM (DE); Frank Stefan Skopp, Eschborn (DE); Marius Beat Hanner, Oberursel (DE); and Uwe Schober, Glashütten (DE)
Assigned to Braun GMBH, Kronberg (DE)
Filed by Braun GmbH, Kronberg (DE)
Filed on Mar. 9, 2021, as Appl. No. 17/196,008.
Claims priority of application No. 20161838 (EP), filed on Mar. 9, 2020.
Prior Publication US 2021/0276208 A1, Sep. 9, 2021
Int. Cl. B26B 19/38 (2006.01); A61C 17/22 (2006.01); B26B 19/28 (2006.01)
CPC B26B 19/388 (2013.01) [A61C 17/221 (2013.01); B26B 19/282 (2013.01)] 19 Claims
OG exemplary drawing
 
1. Small electrical appliance comprising a hair removal device or a toothbrush, comprising:
an electric load, wherein the electric load heats up during operation;
a measuring circuitry for measuring an electrical parameter of the electric load;
a temperature sensor arranged spatially separated from the electric load; and
control circuitry adapted to protect the electric load from overheating by controlling the electric load based on the electrical parameter of the electric load and an output of the temperature sensor, wherein a temperature of the electric load is estimated using the output from the temperature sensor comprising an ambient base temperature and a heating effect derived from the electrical parameter.