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ELECTRIC VEHICLE SUPPORT EQUIPMENT HAVING A SMART PLUG WITH A RELAY CONTROL CIRCUIT

  • US 20140268473A1
  • Filed: 03/14/2013
  • Published: 09/18/2014
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A smart plug for coupling an electric vehicle to a power supply, said smart plug comprising:

  • a relay including contacts, the relay configured to operate in a closed state to enable power to be supplied to the electric vehicle and an open state to prohibit power from being supplied to the electric vehicle;

    a microcontroller (MCU) coupled to the relay, the MCU outputting a control signal to operate the relay in the closed state; and

    a zero crossing detector (ZCD) coupled to the relay, the ZCD outputting a close signal to the relay when a voltage of the power is substantially zero and outputting an open signal to the relay when a current of the power is substantially zero.

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