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Apparatus for and method of protecting wireless-coupled power devices from overvoltage, overcurrent, and overtemperature using hysteresis

  • US 9,966,799 B2
  • Filed: 07/10/2015
  • Issued: 05/08/2018
  • Est. Priority Date: 05/17/2011
  • Status: Active Grant
First Claim
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1. An apparatus to wirelessly transmit power, the apparatus comprising:

  • a power device;

    an overvoltage protecting circuit and an overcurrent protecting circuit configured to protect the power device, wherein the overvoltage protecting circuit comprises a resistive divider, a rectifier, a DC supply, and a hysteresis comparator, and the overcurrent protecting circuit comprises a resistive divider, DC supplies, a switch, an amplifier, and a hysteresis comparator; and

    a control circuit configured to perform an operation on an output signal of the overvoltage protecting circuit and an output signal of the overcurrent protecting circuit, and to determine whether an input signal is transmitted to the power device, in response to an operation result, wherein the control circuit comprises an OR gate and a NAND gate.

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