# US 11,910,499 B2 · Electronic apparatus and control method thereof

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- Number: US 11,910,499 B2
- Document ID: US11910499B2
- Status: Granted
- Kind: B2
- Application number: 17/575,281
- Filed: 2022-01-13
- Published: 2022-10-20
- Granted: 2024-02-20
- Earliest claimed: 2021-04-19
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Junhyun Won; Jiwon Lee; Sungyong Joo; Taejun You
- Web page: https://patentgrep.com/patent/US11910499B2

## CPC

- H05B 45/10: Controlling the intensity of the light
- H05B 45/50: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- G09G 3/00: Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H05B 45/30: Driver circuits
- H10H 29/14: comprising multiple light-emitting semiconductor components
- H05B 45/345: Current stabilisation; Maintaining constant current
- H05B 45/375: using buck topology
- H10W 90/00: Package configurations
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

An electronic apparatus is provided. The electronic apparatus includes: a plurality of LED arrays disposed in parallel, a first sensing inductor connected to a first LED array of the plurality of LED arrays in series, a first auxiliary inductor disposed adjacent to the first sensing inductor, a second sensing inductor connected to a second LED array of the plurality of LED arrays in series, a second auxiliary inductor disposed adjacent to the second sensing inductor, a variable resistance connected to the plurality of LED arrays and configured to adjust an amount of a current flowing to the plurality of LED arrays according to a resistance value, and an LED driver configured to, based on at least one of a first induced voltage generated on the first auxiliary inductor or a second induced voltage generated in the second auxiliary inductor being a threshold voltage or more, identify that an error occurs in at least one of the first LED array or the second LED array, and adjust the resistance value of the variable resistance based on the identified result.

## Claims

### Claim 1

An electronic apparatus comprising:
a plurality of light emitting diode (LED) arrays disposed in parallel;
a first sensing inductor connected to a first LED array of the plurality of LED arrays in series;
a first auxiliary inductor disposed adjacent to the first sensing inductor;
a second sensing inductor connected to a second LED array of the plurality of LED arrays in series;
a second auxiliary inductor disposed adjacent to the second sensing inductor;
a variable resistance connected to the plurality of LED arrays and configured to adjust an amount of a current flowing to the plurality of LED arrays according to a resistance value; and
an LED driver configured to, based on at least one of a first induced voltage generated on the first auxiliary inductor or a second induced voltage generated on the second auxiliary inductor being a threshold voltage or more, identify that an error occurs in at least one of the first LED array or the second LED array, and adjust the resistance value of the variable resistance based on the identified result.

### Claim 2 (depends on 1)

The electronic apparatus according to claim 1, wherein the LED driver is configured to, based on the identification that an error occurs in at least one of the first LED array or the second LED array, increase the resistance value of the variable resistance.

### Claim 3 (depends on 2)

The electronic apparatus according to claim 2, wherein the first sensing inductor and the second sensing inductor comprise primary coils,
each of the first auxiliary inductor and the second auxiliary inductor comprise a secondary coil disposed adjacent to a corresponding primary coil,
a threshold voltage corresponding to the first induced voltage is determined based on a turns ratio of a number of turns of the first sensing inductor to a number of turns of the first auxiliary inductor, and
a threshold voltage corresponding to the second induced voltage is determined based on a turns ratio of a number of turns of the second sensing inductor to a number of turns of the second auxiliary inductor.

### Claim 4 (depends on 2)

The electronic apparatus according to claim 2, wherein the LED driver is configured to, based on the identification that an error occurs in any one of the first LED array or the second LED array, adjust a voltage applied to another one of the first LED array or the second LED array to be less than the threshold voltage by increasing the resistance value of the variable resistance.

### Claim 5 (depends on 1)

The electronic apparatus according to claim 1, wherein the LED driver is configured to, based on the identification that an error occurs in any one of the first LED array or the second LED array based on the identified result, convert a power supply mode for another one of the first LED array or the second LED array from a quasi-resonant (QR) mode to a continuous current mode (CCM).

### Claim 6 (depends on 5)

The electronic apparatus according to claim 5, wherein the LED driver is configured to increase a duty ratio of a pulse width modulation (PWM) current applied to the other one of the first LED array or the second LED array in the CCM mode.

### Claim 7 (depends on 1)

The electronic apparatus according to claim 1, further comprising:
a first switch disposed between the first LED array and the first sensing inductor;
a second switch disposed between the second LED array and the second sensing inductor; and
a third switch disposed between the first sensing inductor and the second sensing inductor,
wherein the LED driver is configured to:
based on the identification that an error occurs in the first LED array based on the identified result, connect the first sensing inductor, the second sensing inductor, and the second LED array in series by controlling the first switch and the third switch, and
based on the identification that an error occurs in the second LED array based on the identified result, connect the first sensing inductor, the second sensing inductor, and the first LED array in series by controlling the second switch and the third switch.

### Claim 8 (depends on 1)

The electronic apparatus according to claim 1, wherein a plurality of first LEDs included in the first LED array and a plurality of second LEDs included in the second LED array are disposed alternately.

### Claim 9 (depends on 1)

The electronic apparatus according to claim 1, wherein the plurality of LED arrays, the sensing inductor and the auxiliary inductor corresponding to each of the plurality of LED arrays, and the variable resistance are included in an LED circuit, and
a resistance value of the LED circuit is adjusted according to the adjustment of the resistance value of the variable resistance.

### Claim 10 (depends on 1)

The electronic apparatus according to claim 1, wherein the LED driver is configured to: identify the number of LED arrays in which an error occurs among the plurality of LED arrays, and
adjust the resistance value of the variable resistance to correspond to the identified number.

### Claim 11

A method for controlling an electronic apparatus comprising a plurality of light emitting diode (LED) arrays disposed in parallel, a first sensing inductor connected to a first LED array of the plurality of LED arrays in series, and a second sensing inductor connected to a second LED array in series, the method comprising:
based on at least one of a first induced voltage generated on a first auxiliary inductor disposed adjacent to the first sensing inductor or a second induced voltage generated on a second auxiliary inductor disposed adjacent to the second sensing inductor being a threshold voltage or more, identifying that an error occurs in at least one of the first LED array or the second LED array; and
adjusting a resistance value of a variable resistance connected to the plurality of LED arrays and adjusting an amount of a current flowing to the plurality of LED arrays according to the resistance value based on the identified result.

### Claim 12 (depends on 11)

The method according to claim 11, wherein the adjusting comprises, based on the identification that an error occurs in at least one of the first LED array or the second LED array, increasing the resistance value of the variable resistance.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the first sensing inductor and the second sensing inductor comprise primary coils,
each of the first auxiliary inductor and the second auxiliary inductor comprise a secondary coil disposed adjacent to a corresponding primary coil,
a threshold voltage corresponding to the first induced voltage is determined based on a turns ratio of a number of turns of the first sensing inductor to a number of turns of the first auxiliary inductor, and
a threshold voltage corresponding to the second induced voltage is determined based on a turns ratio of the number of turns of the second sensing inductor to the number of turns of the second auxiliary inductor.

### Claim 14 (depends on 12)

The method according to claim 12, wherein the adjusting comprises, based on the identification that an error occurs in any one of the first LED array or the second LED array, adjusting a voltage applied to another one of the first LED array or the second LED array to be less than the threshold voltage by increasing the resistance value of the variable resistance.

### Claim 15 (depends on 11)

The method according to claim 11, further comprising:
based on the identification that an error occurs in any one of the first LED array or the second LED array based on the identified result, converting a power supply mode for one of the first LED array or the second LED array from a quasi-resonant (QR) mode to a continuous current mode (CCM).

### Claim 16 (depends on 15)

The method according to claim 15, further comprising:
increasing a duty ratio of a pulse width modulation (PWM) current applied to the other one of the first LED array or the second LED array in the CCM mode.

### Claim 17 (depends on 11)

The method according to claim 11, further comprising:
a first switch disposed between the first LED array and the first sensing inductor;
a second switch disposed between the second LED array and the second sensing inductor; and
a third switch disposed between the first sensing inductor and the second sensing inductor,
based on the identification that an error occurs in the first LED array based on the identified result, connecting the first sensing inductor, the second sensing inductor, and the second LED array in series by controlling the first switch and the third switch, and
based on the identification that an error occurs in the second LED array based on the identified result, connecting the first sensing inductor, the second sensing inductor, and the first LED array in series by controlling the second switch and the third switch.

### Claim 18 (depends on 11)

The method according to claim 11, wherein a plurality of first LEDs included in the first LED array and a plurality of second LEDs included in the second LED array are disposed alternately.

### Claim 19 (depends on 11)

The method according to claim 11, wherein the plurality of LED arrays, the sensing inductor and the auxiliary inductor corresponding to each of the plurality of LED arrays, and the variable resistance are included in an LED circuit, and
a resistance value of the LED circuit is adjusted according to the adjustment of the resistance value of the variable resistance.

### Claim 20 (depends on 11)

The method according to claim 11, wherein the identifying comprises identifying the number of LED arrays in which an error occurs among the plurality of LED arrays, and
wherein the adjusting comprises adjusting the resistance value of the variable resistance to correspond to the identified number.