Patent ID: 8891270

Claim:
A voltage adjusting circuit, comprising: an inducing circuit configured to induce a voltage from electromagnetic waves; a first rectifying circuit configured to rectify an output signal of the inducing circuit; a second rectifying circuit configured to rectify the output signal of the inducing circuit; a third rectifying circuit configured to rectify the output signal of the inducing circuit; a first regulator configured to regulate an output signal of the first rectifying circuit; and a second regulator configured to regulate an output signal of the second rectifying circuit by connecting a current generated by an output voltage of the second rectifying circuit to ground when the output voltage of the second rectifying circuit is greater than a predetermined reference voltage, and blocking the current generated by the output voltage of the second rectifying circuit when the output voltage of the second rectifying circuit is less than the predetermined reference voltage, the second regulator controlling the output signal of the second rectifying circuit in response to an output signal of the third rectifying circuit.