公开(公告)号：US20180219474A1

公开(公告)日：2018-08-02

申请号：US15746248

申请日：2016-06-30

Applicant: Dyson Technology Limited

Inventor： Stephen GREETHAM ,  Stephen BERRY ,  Hari Babu KOTTE ,  Ambatipudi RADHIKA

IPC: H02M1/42 ,  H02J7/02 ,  H02J7/04 ,  H02M3/335 ,  H02M1/08 ,  H02M1/12

CPC classification number: H02M1/4241 ,  H02J7/022 ,  H02J7/045 ,  H02J2007/0059 ,  H02M1/083 ,  H02M1/12 ,  H02M1/4208 ,  H02M1/4225 ,  H02M1/4258 ,  H02M3/33576 ,  H02M2001/0058 ,  Y02B40/90 ,  Y02B70/126 ,  Y02P80/112

Abstract: A battery charger comprising input terminals for connection to an AC source, output terminals for connection to a battery to be charged, and a power factor correction (PFC) circuit connected between the input terminals and the output terminals. The PFC circuit comprises a current control loop for regulating an input current drawn from the AC source. The voltage at the output of the PFC circuit is regulated by the voltage of the battery which is reflected back to the PFC circuit. As a result, the battery charger acts as a current source that outputs an output current at the output terminals, and the waveform of the output current is periodic with a frequency twice that of the input current and a ripple of at least 50%.

公开(公告)号：US20180205313A1

公开(公告)日：2018-07-19

申请号：US15746403

申请日：2016-06-30

Applicant: Dyson Technology Limited

Inventor： Stephen GREETHAM ,  Stephen BERRY ,  Hari Babu KOTTE ,  Ambatipudi RADHIKA

IPC: H02M1/42 ,  H02J7/02 ,  H02M3/335 ,  H02M1/12

CPC classification number: H02M1/4241 ,  H02J7/022 ,  H02M1/12 ,  H02M1/4225 ,  H02M1/4258 ,  H02M1/4266 ,  H02M3/33592 ,  H02M3/337 ,  H02M2001/0058 ,  H02M2001/007 ,  H02M2001/4291 ,  Y02B40/90 ,  Y02B70/126 ,  Y02B70/1475 ,  Y02B70/1491 ,  Y02P80/112

Abstract: A battery charger comprising input terminals for connection to an AC source supplying an alternating input voltage, output terminals for connection to a battery to be charged, and a power factor correction (PFC) circuit connected between the input terminals and the output terminals. The battery charger monitors the voltage of the battery and operates in a first mode when the voltage is below a threshold. The battery charger then switches to a second mode when the voltage exceeds the threshold. The PFC circuit regulates an input current drawn from the AC source such that the waveform of the input current when operating in the first mode is different to that when operating in the second mode.

公开(公告)号：US20240225230A1

公开(公告)日：2024-07-11

申请号：US18563867

申请日：2022-05-10

Applicant: Dyson Technology Limited

Inventor： Darren Matthew LEWIS ,  Henry Licming LAMBOURN ,  Joseph TIMM ,  Stephen BERRY ,  Thomas Alexander CARLYLE

IPC: A45D2/00 ,  H05B6/48 ,  H05B6/54 ,  H05B6/62

CPC classification number: A45D2/002 ,  H05B6/48 ,  H05B6/54 ,  H05B6/62

Abstract: A hair styling appliance is described having electrodes and a drive unit. The drive unit is operable to determine a presence of hair between the electrodes. In response to determining that hair is present, the drive unit applies an alternating voltage to the electrodes to heat the hair dielectrically.

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.

公开(公告)号：US20180198366A1

公开(公告)日：2018-07-12

申请号：US15746401

申请日：2016-06-30

Applicant: Dyson Technology Limited

Inventor： Stephen GREETHAM ,  Stephen BERRY ,  Hari Babu KOTTE ,  Ambatipudi RADHIKA

IPC: H02M1/42 ,  H02J7/02 ,  H02M3/335 ,  H02J7/06

CPC classification number: H02M1/4225 ,  H02J7/022 ,  H02J7/06 ,  H02J2007/0059 ,  H02M1/4208 ,  H02M1/4241 ,  H02M1/4258 ,  H02M1/44 ,  H02M3/33576 ,  H02M3/33592 ,  H02M2001/007 ,  Y02B40/90 ,  Y02B70/126 ,  Y02P80/112

Abstract: A battery charger comprising input terminals for connection to an AC source supplying an alternating input voltage, output terminals for connection to a battery to be charged, and a PFC circuit connected between the input terminals and the output terminals. The power factor correction (PFC) circuit regulates an input current drawn from the AC source such that the input current has a waveform selected from a sine wave with third harmonic injection, a clipped sine wave and a trapezoidal wave. The battery charger then generates an output current at the output terminals, the output current having a waveform defined by the multiplication of the input current and the input voltage.