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    • 65. 发明申请
    • RESISTIVE LIQUID HEATER
    • WO2022003314A1
    • 2022-01-06
    • PCT/GB2021/051510
    • 2021-06-16
    • DYSON TECHNOLOGY LIMITED
    • GREETHAM, Stephen
    • H05B6/60F24H1/10F24H1/106F24H9/1818H05B2203/021
    • A liquid heater is described comprising 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 having a first total electrical resistance 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. Additionally or alternatively, the control unit controls the switches such that the electrodes of the first electrode configuration are energised with a voltage having a first duty, and the electrodes of the second electrode configuration are energised with a voltage having a second higher duty.