Electronic device

Patent metadata

Field	Value
Publication number	US-9883572-B2
Application number	US-201715587408-A
Country	US
Kind code	B2
Filing date	May 5, 2017
Priority date	May 10, 2016
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

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.

First claim

What is claimed is:

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.

2. 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.

3. 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.

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

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

Assignees

• Asustek Comp Inc

Inventors

• Huang Hsin-Wu

Classifications

• H05B41/34

  to provide a sequence of flashes · CPC title

• H05B41/16 Primary

  in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC {, or with network frequencies} · CPC title

• H05B41/38

  Controlling the intensity of light · CPC title

• H05B41/282 Primary

  with semiconductor devices ({H05B41/2806}, H05B41/288, H05B41/295 take precedence) · CPC title

• H05B41/3927

  by pulse width modulation (H05B41/3922 takes precedence) · CPC title