# US 9,883,572 B2 · Electronic device

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- Number: US 9,883,572 B2
- Document ID: US9883572B2
- Status: Granted
- Kind: B2
- Application number: 15/587,408
- Filed: 2017-05-05
- Published: 2017-11-16
- Granted: 2018-01-30
- Earliest claimed: 2016-05-10
- Assignees: ASUSTeK COMPUTER INC.
- Applicants: ASUSTeK COMPUTER INC.
- Inventors: Hsin-Wu Huang
- Web page: https://patentgrep.com/patent/US9883572B2

## CPC

- H05B 41/16: in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC {, or with network frequencies}
- H05B 41/282: with semiconductor devices ({H05B41/2806}, H05B41/288, H05B41/295 take precedence)
- H05B 41/34: to provide a sequence of flashes
- H05B 41/38: Controlling the intensity of light
- H05B 41/3927: {by pulse width modulation (H05B41/3922 takes precedence)}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

An electronic device adapted for adjusting a light effect of a CCFL is provided. The electronic device is electronically connected to the CCFL. The electronic device comprises a PWM controller configured to receive at least a digital signal and to output a specific-frequency reference signal according to the digital signal, a driver electronically connected to the PWM controller and configured to output a first voltage signal according to the specific-frequency reference signal, and a transformer electronically connected to the driver and the CCFL. The transformer amplifies the first voltage signal to generate a second voltage signal and sends the second voltage signal to the CCFL. A light effect is generated by the CCFL according to the second voltage signal.

## Claims

### Claim 1

An electronic device, adapted for adjusting a light effect of a cold cathode fluorescent lamps (CCFL), the electronic device is electronically connected to the CCFL, the electronic device comprising:
a pulse width modulation (PWM) controller configured to receive at least a digital signal and to output a specific-frequency reference signal according to the digital signal;
a driver electronically connected to the PWM controller and configured to output a first voltage signal according to the specific-frequency reference signal; and
a transformer electronically connected to the driver and the CCFL, the transformer amplifies the first voltage signal to generate a second voltage signal and sends the second voltage signal to the CCFL, and a light effect is generated by the CCFL according to the second voltage signal.

### Claim 2 (depends on 1)

The electronic device according to claim 1, wherein the electronic device further includes a power supply connected to the PWM controller, and the PWM controller is configured to modulate a direct current voltage received from the power supply into the specific-frequency reference signal according to the digital signal.

### Claim 3 (depends on 1)

The electronic device according to claim 1, wherein the electronic device further includes at least a general purpose input/output (GPIO) port connected to the PWM controller, and the PWM controller receives the digital signal via the GPIO port.

### Claim 4 (depends on 1)

The electronic device according to claim 1, wherein the PWM controller is enabled via an enabling signal.

### Claim 5 (depends on 1)

The electronic device according to claim 1, wherein the second voltage signal is an alternating current (AC) voltage signal for driving the CCFL to discharge, the light effects of the CCFL are different based on the second voltage signals with different oscillation frequencies.

### Claim 6 (depends on 5)

The electronic device according to claim 5, wherein when the oscillation frequency of the second voltage signal is in a first frequency range, the light effect of the CCFL is a flashing lightning-shape lighting.

### Claim 7 (depends on 5)

The electronic device according to claim 5, wherein when the oscillation frequency of the second voltage signal is in a second frequency range, the light effect of the CCFL is a non-flashing lightning-shape lighting.

### Claim 8 (depends on 5)

The electronic device according to claim 5, wherein when the oscillation frequency of the second voltage signal is in a third frequency range, the light effect of the CCFL is a static curve-line lighting or a static straight-line lighting.

### Claim 9 (depends on 5)

The electronic device according to claim 5, wherein when the oscillation frequency of the second voltage signal is increased gradually in a first transitional frequency range, the light effect of the CCFL is gradually changed from a flashing lightning-shape lighting to a non-flashing lightning-shape lighting.

### Claim 10 (depends on 5)

The electronic device according to claim 5, wherein when the oscillation frequency of the second voltage signal is increased gradually in a second transitional frequency range, the light effect of the CCFL is gradually changed from a non-flashing lightning-shape lighting to a static curve-line lighting or a static straight-line lighting.