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    VACUUM CLEANER HAVING A DUAL POWER SUPPLY
    1.
    发明申请
    VACUUM CLEANER HAVING A DUAL POWER SUPPLY 审中-公开

    公开(公告)号：US20180199782A1

    公开(公告)日：2018-07-19

    申请号：US15746405

    申请日：2016-06-30

    Applicant: Dyson Technology Limited

    Inventor： Stephen GREETHAM

    IPC: A47L9/28

    CPC classification number: A47L9/2868 ,  A47L9/2878

    Abstract: A vacuum cleaner comprising a vacuum motor and a power supply. The power supply comprises input terminals for connection to an AC source, output terminals connected to the vacuum motor, an AC-to-DC stage, and a battery. The AC-to-DC stage converts alternating current drawn from the AC source into direct current that is supplied to the battery and the vacuum motor. The power supply operates in a first mode when disconnected from the AC source and a second mode when connected to the AC source. In the second mode, the vacuum motor operates in either a low-power state or a high-power state. In the low-power state, the vacuum motor and the battery each draw power from the AC source such that the battery charges. When the vacuum motor operates in the high-power state, the vacuum motor draws power from both the AC source and the battery such that battery discharges.

    CONTROL OF A BRUSHLESS MOTOR
    2.
    发明申请
    CONTROL OF A BRUSHLESS MOTOR 审中-公开
    无刷电机的控制

    公开(公告)号：US20140009095A1

    公开(公告)日：2014-01-09

    申请号：US13933473

    申请日：2013-07-02

    Applicant: Dyson Technology Limited

    Inventor： Stephen GREETHAM ,  David John HAWKER

    IPC: H02P1/04

    Abstract: A method of controlling a brushless motor that includes sensing a temperature and using the sensed temperature to define a current limit. A lower current limit is then defined for a lower sensed temperature. A winding of the motor is sequentially energised and de-energised, with the winding being de-energised when current in the winding exceeds the defined current limit.

    Abstract translation: 一种控制无刷电动机的方法，包括感测温度并使用所感测的温度来限定电流限制。 然后为较低的感测温度定义较低的电流限制。 电机的绕组被顺序地通电并断电，当绕组中的电流超过限定的电流极限时，绕组被断电。

    DRIVE CIRCUIT FOR A BRUSHLESS MOTOR
    3.
    发明公开
    DRIVE CIRCUIT FOR A BRUSHLESS MOTOR 审中-公开

    公开(公告)号：US20230421085A1

    公开(公告)日：2023-12-28

    申请号：US18038184

    申请日：2021-11-15

    Applicant: Dyson Technology Limited

    Inventor： Stephen GREETHAM ,  Maté HORVÁT

    IPC: H02P27/04

    CPC classification number: H02P27/04

    Abstract: A drive circuit for a brushless motor is described. The drive circuit includes a converter for connection to a phase winding of the motor, and a controller. The converter includes a plurality of switches and the controller controls the states of the switches to configure the converter in one of a plurality of configurations. In a first configuration, current is permitted to flow through the phase winding in a first direction and in a second opposite direction. In a second configuration, current is permitted to flow through the phase winding in the first direction and is prevented from flowing through the phase winding in the second direction. The controller includes an input for receiving a signal indicative of current in the converter, and the controller configures the converter from the first configuration to the second configuration in response to a characteristic of the current.

    RESISTIVE LIQUID HEATER
    4.
    发明公开
    RESISTIVE LIQUID HEATER 审中-公开

    公开(公告)号：US20230337334A1

    公开(公告)日：2023-10-19

    申请号：US18009666

    申请日：2021-06-16

    Applicant: Dyson Technology Limited

    Inventor： Stephen GREETHAM

    IPC: H05B3/60 ,  H05B1/02 ,  H05B3/03 ,  F24H15/219 ,  F24H15/37 ,  F24H1/10 ,  F24H15/407

    CPC classification number: H05B3/60 ,  H05B1/0202 ,  H05B3/03 ,  F24H15/219 ,  F24H15/37 ,  F24H1/106 ,  F24H15/407 ,  H05B2203/021 ,  F24H2250/10

    Abstract: A liquid heater is described including a chamber for receiving a liquid, pairs of electrodes located within the chamber for applying electric current to the liquid, input terminals for connection to a power supply, a plurality of switches for connecting the pairs of electrodes to the input terminals, and a control unit for controlling the switches. The switches have a plurality of different states for selectively connecting pairs of electrodes to the input terminals in one of a plurality of electrode configurations, the electrodes having a different total electrical resistance in each electrode configuration. When switching between a first electrode configuration and a second electrode configuration having a second lower total electrical resistance, the control unit controls the switches such that switching between the electrode configurations occurs in response to zero-crossings in a voltage of the power supply or the electrodes of the second electrode configuration are energised with a voltage having a higher duty than the electrodes of the first electrode configuration.

    DRIVE CIRCUIT FOR A BRUSHLESS MOTOR (as amended)
    5.
    发明申请
    DRIVE CIRCUIT FOR A BRUSHLESS MOTOR (as amended) 审中-公开
    无刷电机驱动电路（修订）

    公开(公告)号：US20160028334A1

    公开(公告)日：2016-01-28

    申请号：US14773251

    申请日：2014-03-10

    Applicant: DYSON TECHNOLOGY LIMITED

    Inventor： Stephen GREETHAM ,  Andrew Charlton CLOTHIER

    IPC: H02P6/00

    CPC classification number: H02P6/28 ,  H02P6/085 ,  H02P6/26 ,  H02P27/16

    Abstract: A drive circuit for a brushless motor comprising power lines for carrying an AC voltage, an inverter, and a controller. Each leg of the inverter is connected to a winding of the motor and comprises one or more bi-directional switches. The controller can output control signals that cause a pair of switches to conduct in one direction during the positive half-cycle of the AC voltage, and to conduct in the opposite direction during the negative half-cycle of the AC voltage. Alternatively, The controller can output control signals that cause a first pair of switches to conduct during the positive half-cycle of the AC voltage and a second pair of switches to conduct during the negative half-cycle of the AC voltage such that the winding is excited in the same direction irrespective of the polarity of the AC voltage.

    Abstract translation: 一种用于无刷电动机的驱动电路，包括用于承载交流电压的电力线，逆变器和控制器。 逆变器的每条支路连接到电动机的绕组，并且包括一个或多个双向开关。 控制器可以输出控制信号，使得一对开关在交流电压的正半周期内沿一个方向传导，并且在交流电压的负半周期期间以相反的方向导通。 或者，控制器可以输出在AC电压的正半周期期间导致第一对开关导通的控制信号，并且第二对开关在AC电压的负半周期期间导通，使得绕组为 不管交流电压的极性如何，都以相同方向激励。

    DRIVE CIRCUIT FOR A BRUSHLESS MOTOR HAVING AN AC/AC BOOST CONVERTER
    7.
    发明申请
    DRIVE CIRCUIT FOR A BRUSHLESS MOTOR HAVING AN AC/AC BOOST CONVERTER 有权
    具有AC / AC升压转换器的无刷电机的驱动电路

    公开(公告)号：US20160261214A1

    公开(公告)日：2016-09-08

    申请号：US15028344

    申请日：2014-10-07

    Applicant: DYSON TECHNOLOGY LIMITED

    Inventor： Stephen GREETHAM ,  Andrew Charlton CLOTHIER

    IPC: H02P6/14 ,  H02M5/293

    CPC classification number: H02P6/14 ,  H02M5/293

    Abstract: An AC/AC boost converter comprising input terminals, output terminals, an inductor, a bridge arm comprising a pair of bi-directional switches, a capacitor and a control circuit for controlling the switches. The bridge arm and the capacitor are connected in parallel across the output terminals. The inductor has a first end connected to one of the input terminals and a second end connected to one of an end and a junction of the bridge arm, the junction being located between the two switches. Another of the input terminals is then connected to the other of the end and the junction of the bridge arm. An AC power supply supplies an AC input voltage at the input terminals, and the control circuit controls the switches of the bridge arm such that an AC output voltage is supplied at the output terminals, the AC output voltage being greater than the AC input voltage.

    Abstract translation: 一种AC / AC升压转换器，包括输入端子，输出端子，电感器，包括一对双向开关的电桥臂，用于控制开关的电容器和控制电路。 桥臂和电容器并联连接在输出端子上。 电感器具有连接到一个输入端子的第一端和连接到桥臂的端部和接头之一的第二端，该接合部位于两个开关之间。 另一个输入端子然后连接到桥臂的端部和接头中的另一个。 AC电源在输入端提供交流输入电压，控制电路控制桥臂的开关，使输出端提供交流输出电压，交流输出电压大于交流输入电压。

    RESISTIVE LIQUID HEATER
    8.
    发明公开
    RESISTIVE LIQUID HEATER 审中-公开

    公开(公告)号：US20230221037A1

    公开(公告)日：2023-07-13

    申请号：US18009643

    申请日：2021-06-16

    Applicant: Dyson Technology Limited

    Inventor： Stephen GREETHAM

    IPC: F24H1/10 ,  H05B1/02

    CPC classification number: F24H1/106 ,  H05B1/0244 ,  F24H2250/10

    Abstract: A liquid heater is described including a chamber for receiving a liquid, a pair of electrodes located within the chamber for applying electric current to the liquid, input terminals for connection to a power supply, a plurality of bi-directional switches for connecting the electrodes to the input terminals, and a control unit for controlling the switches. The power supply supplies an alternating voltage having a frequency no greater than 60 Hz, and the control unit controls the switches such that the electrodes are energised with an alternating voltage having a frequency no less than 150 kHz.

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