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US 9,178,362 B2Granted
Voltage adjusting circuit and contactless card and contactless card system which include the same
AssigneeSamsung Electronics Co., Ltd.
InventorsIl Jong Song, Jong Pil Cho
Life of this patent
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Abstract
A voltage adjusting circuit includes 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 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.
Claims10
A voltage adjusting circuit, comprising:
- a first rectifying circuit configured to rectify an induced voltage;
- a second rectifying circuit configured to rectify the induced voltage;
- a third rectifying circuit configured to rectify the induced voltage;
- 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.
3 more elements
A contactless card, comprising:
- a voltage adjusting circuit comprising:
- a first rectifying circuit configured to rectify an induced voltage;
- a second rectifying circuit configured to rectify the induced voltage;
- a third rectifying circuit configured to rectify the induced voltage;
- 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;
- and
- an internal logic circuit configured to receive a direct current (DC) voltage from the first regulator and process data received or transmitted through the inducing circuit.
6 more elements
Dependencies are inferred from the claim text.