US 12,272,940 B2
Protection circuit for an electrical appliance
Yuen Kee Leow, Singapore (SG); Weifu Yu, Singapore (SG); Shiyi Chen, Singapore (SG); Aaron Qingwei Cai, Singapore (SG); and Kai Wang, Singapore (SG)
Assigned to Dyson Technology Limited, Malmesbury (GB)
Appl. No. 18/008,218
Filed by Dyson Technology Limited, Wiltshire (GB)
PCT Filed Apr. 22, 2021, PCT No. PCT/GB2021/050972
§ 371(c)(1), (2) Date Dec. 5, 2022,
PCT Pub. No. WO2021/250369, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 2008956 (GB), filed on Jun. 12, 2020.
Prior Publication US 2023/0246434 A1, Aug. 3, 2023
Int. Cl. H02H 5/04 (2006.01)
CPC H02H 5/04 (2013.01) 14 Claims
OG exemplary drawing
 
1. A protection circuit for an electric appliance, comprising:
a first comparator module configured to compare an operating parameter input signal to a threshold value and to output a first control signal to a first switching circuit configured to control power flow to an associated electrical component,
wherein the first comparator module is configured to receive an enable/disable signal from a first state-change latching device,
wherein the first state-change latching device is responsive to a state change of the first control signal from the first comparator module, in response to which the state-change latching device changes the enable/disable signal from an enable state to a disable state thereby to set the first control signal into an off state and thereby lock the appliance in a non-working safe state.