Electronic device including circuit configured to operate using boosted voltage

• US 10,734,901 B2
• Filed: 07/06/2018
• Issued: 08/04/2020
• Est. Priority Date: 12/05/2017
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Oh, Hyoungseok, Moon, Youngjin
• Primary Examiner(s): Diao, M Baye
• Application Number:
  US16/028,460
• Publication Number:
  US 20190173382A1
• Time in Patent Office: 760 Days
• Field of Search: 320108
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: H02M 3/1588 comprising at least one synchronous rectifier element H02M3/1582, H02M3/1584 take precedence
• CPC Class Codes: H02M 3/33576 having at least one active switching element at the secondary side of an isolation transformer
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 52/00 Power management, e.g. TPC [Transmission Power Control], power saving or power classes gain control in transmitters or power amplifiers H03G3/3042

Abstract

An electronic device includes a transmitter circuit, an inductive element, and a boost converter. The transmitter circuit outputs a current, which has a varying level, based on a supply voltage. The inductive element generates an output signal based on the current, such that wireless communication with an external device is performed. The boost converter boosts a system voltage to output the supply voltage. A voltage level of the supply voltage provided from the boost converter to the transmitter circuit based on the boosted system voltage is maintained to be equal to or higher than a reference level which is higher than a voltage level of the system voltage, regardless of a decrease in the voltage level of the system voltage.

Claims

1. An electronic device comprising:

a transmitter circuit that outputs a current based on a supply voltage, the current having a level which varies corresponding to values of data;

an inductive element that generates an output signal based on the current, such that wireless communication with an external device is performed with regard to the data; and

a boost converter that boosts a system voltage to output the supply voltage, wherein;

a voltage level of the supply voltage provided from the boost converter to the transmitter circuit based on the boosted system voltage is maintained to be equal to or higher than a first reference level regardless of a decrease in a voltage level of the system voltage, and

the first reference level is higher than the voltage level of the system voltage.

2. The electronic device of claim 1, further comprising a power manager circuit that outputs power to be supplied to components of the electronic device, based on the system voltage.

3. The electronic device of claim 1, wherein:

as the system voltage is boosted, a voltage level of the boosted system voltage is higher than the voltage level of the system voltage, and

the boost converter outputs the boosted system voltage as the supply voltage.

4. The electronic device of claim 1, wherein variation in the level of the current includes a first transition from a first peak level to a second peak level and a second transition from the second peak level to the first peak level.

5. The electronic device of claim 4, wherein:

when a value of the data corresponds to a first logic value, the second transition does not occur during a reference time interval after the first transition, and

when a value of the data corresponds to a second logic value, the second transition occurs within the reference time interval after the first transition.

6. The electronic device of claim 4, wherein:

amplitudes of the first peak level and the second peak level are maintained to be equal to or greater than a reference amplitude, and

the reference amplitude corresponds to a value which is obtained by dividing the first reference level by a resistance value of a resistance component of the inductive element.

7. The electronic device of claim 1, wherein the voltage level of the supply voltage is maintained between the first reference level and a second reference level which is higher than the first reference level.

8. An electronic device comprising:

an inductive element that generates an output signal based on a current;

a transmitter circuit that outputs the current to the inductive element based on a supply voltage; and

a charger circuit that boosts a voltage of a battery terminal to selectively output the supply voltage, such that a voltage level of the supply voltage is maintained to be equal to or higher than a reference level regardless of a voltage level of the voltage of the battery terminal, the reference level being higher than the voltage level of the voltage of the battery terminal, wherein

the supply voltage output from the charger circuit is provided to the transmitter circuit through a charging input terminal based on the boosted voltage.

9. The electronic device of claim 8, wherein the charger circuit outputs a charging voltage for charging a battery through the battery terminal, based on power received through the charging input terminal.

10. The electronic device of claim 9, wherein:

when the charger circuit outputs the charging voltage through the battery terminal, the charger circuit does not output the supply voltage, and

when the charger circuit outputs the supply voltage through the charging input terminal, the charger circuit does not output the charging voltage.

11. The electronic device of claim 8, further comprising:

a voltage regulator comprising transistors and the inductive element that regulate a voltage of the charging input terminal from the voltage of the battery terminal or regulate the voltage of the battery terminal from the voltage of the charging input terminal, wherein

the transistors are implemented within the charger circuit.

12. The electronic device of claim 11, wherein when the charger circuit outputs a charging voltage through the battery terminal, the voltage regulator operates as a buck converter for dropping the voltage of the charging input terminal to regulate the voltage of the battery terminal.

13. The electronic device of claim 12, wherein the charger circuit outputs the regulated voltage of the battery terminal as the charging voltage.

14. The electronic device of claim 11, wherein when the charger circuit outputs the supply voltage through the charging input terminal, the voltage regulator operates as a boost converter for boosting the voltage of the battery terminal to regulate the voltage of the charging input terminal.

15. The electronic device of claim 14, wherein the charger circuit outputs the regulated voltage of the charging input terminal as the supply voltage.

16. The electronic device of claim 11, wherein when connection with a peripheral device is provided, the voltage regulator operates as a boost converter for boosting the voltage of the battery terminal to regulate the voltage of the charging input terminal.

17. The electronic device of claim 16, wherein the charger circuit outputs the regulated voltage of the charging input terminal as an operation voltage for operating the peripheral device.

18. An electronic device comprising:

a transmitter circuit that outputs a current based on a supply voltage; and

an inductive element that generates an output signal based on the current, wherein;

a voltage level of the supply voltage received in the transmitter circuit is maintained between a first reference level and a second reference level and each of the first reference level and the second reference level is higher than a voltage level of a battery voltage, and

a level of the current output from the transmitter circuit to the inductive element varies between a positive peak level and a negative peak level and amplitudes of the positive peak level and the negative peak level vary between a first reference amplitude and a second reference amplitude.

19. The electronic device of claim 18, wherein the supply voltage is generated by being boosted based on the battery voltage, such that the voltage level of the supply voltage is higher than the voltage level of the battery voltage.

20. The electronic device of claim 18, wherein the first reference amplitude and the second reference amplitude correspond to values obtained by dividing the first reference level and the second reference level by a resistance value of a resistance component of the inductive element, respectively.