作者: Andrew John Howe , David Charles Harding , Simon Peter Turner
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摘要: An electrical power supply system comprising: an connector (106); a signal transmitter (200) configured to send (500) having first voltage waveform the measurement module (202) measure second at and controlling means comprising one or more processors (108) compare shape of measured by with signal; control transfer and/or from (106) based on comparison. The may be alternating current two pulses (502, 504), which have equal duration opposite amplitude.