公开(公告)号：US20240237800A1

公开(公告)日：2024-07-18

申请号：US18288671

申请日：2022-04-19

Applicant: Dyson Technology Limited

Inventor： Yuen Kee LEOW ,  Weifu YU ,  Clement Jian Ming TAN ,  Xinyi LI ,  Gaudencio III Racho TEVES ,  Stephen John WOOLAGHAN ,  Kishan Mayur AMRATIA ,  Jack Michael THOMPSON ,  Brian William WEEKS ,  Teng Lee KHOO

IPC: A45D20/12

CPC classification number: A45D20/12

Abstract: A haircare appliance includes a pressure sensor for generating a pressure signal indicative of air pressure within an airflow path, the pressure sensor being upstream of an airflow generator. A controller is configured to estimate, based at least partly on the pressure signal, a blockage factor corresponding to an amount by which the airflow path is blocked. When the estimated blockage factor exceeds a blockage warning threshold, a warning indicative of a partial blockage is output. When the estimated blockage factor exceeds a critical threshold, the critical threshold being higher than the blockage warning threshold, a power output of at least one component of the haircare appliance is turned off or reduced.

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：US20240206612A1

公开(公告)日：2024-06-27

申请号：US18288567

申请日：2022-04-19

Applicant: Dyson Technology Limited

Inventor： Yuen Kee LEOW ,  Li NIU ,  Stephen John WOOLAGHAN ,  Kishan Mayur AMRATIA ,  Stephen BERRY ,  Michael James WAITE ,  Andrew John Dennis SPILLMAN ,  Neil WAREHAM ,  Robert STREETER

IPC: A45D20/12 ,  H03K17/56

CPC classification number: A45D20/12 ,  H03K17/56

Abstract: A haircare device includes at least one power semiconductor switch coupled to drive, in use, a heater. A temperature sensor disposed for sensing a temperature of the at least one power semiconductor switch and outputting a temperature signal indicative of the sensed temperature. A controller is configured to determine whether the temperature signal is indicative of a temperature of the one or more power semiconductor switch exceeding a threshold. When the temperature signal is indicative of the temperature of the one or more power semiconductor switch exceeding the threshold, a power output of the at least one power semiconductor switch is turned off or reduced.