公开(公告)号：US20240215113A1

公开(公告)日：2024-06-27

申请号：US18288721

申请日：2022-04-19

Applicant: Dyson Technology Limited

Inventor： Yuen Kee LEOW ,  Zhiyang PAN ,  Kai WANG ,  Stephen John WOOLAGHAN ,  Kishan Mayur AMRATIA ,  Brian William WEEKS ,  Glen Raymond WARDLE ,  Adorjan GAVEL

IPC: H05B1/02 ,  H03K3/0233 ,  H03K3/356 ,  H03K3/3565 ,  H03K5/1536 ,  H03K5/24

CPC classification number: H05B1/0225 ,  H03K3/02337 ,  H03K3/356104 ,  H03K3/3565 ,  H03K5/1536 ,  H03K5/24 ,  H05B1/0252

Abstract: A method for generating a clock signal from an AC power supply signal includes receiving a reference signal at a first input of a comparator and receiving the AC power supply signal at a second input of the comparator. A clock signal is output by the comparator based on a comparison of the reference signal and the AC power supply signal, such that transitions of the clock signal take place while the reference signal is at a trigger voltage. Following each clock signal transition, the reference signal is changed from the trigger voltage to a hysteresis voltage that reduces a likelihood of the comparator outputting, immediately after each clock signal transition, a spurious transition of the clock signal due to noise on the AC power supply signal. The reference signal is then returned from the hysteresis voltage to the trigger voltage prior to return of the AC power supply signal to a level intended to cause a further clock signal transition at the output of the comparator.

公开(公告)号：US20230246434A1

公开(公告)日：2023-08-03

申请号：US18008218

申请日：2021-04-22

Applicant: Dyson Technology Limited

Inventor： Yuen Kee LEOW ,  Weifu YU ,  Shiyi CHEN ,  Aaron Qingwei CAI ,  Kai WANG

IPC: H02H5/04

CPC classification number: H02H5/04

Abstract: A protection circuit for an electric appliance that is configured to control power supply to an associated electrical component of the appliance such as a heating device, lamp or motor in the event that unsafe conditions are detected. The protection circuit includes 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 the associated electrical component. The first comparator module is configured to receive an enable/disable signal from a first state-change latching device, which 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.