Light emitting diode driving system

• US 9,060,395 B1
• Filed: 05/20/2014
• Issued: 06/16/2015
• Est. Priority Date: 03/19/2014
• Status: Active Grant

• Current Assignee: Semisilicon Technology Corp.
• Original Assignee: Semisilicon Technology Corp.
• Inventors: Peng, Wen-Chi
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): Chan, Wei
• Application Number:
  US14/282,443
• Time in Patent Office: 392 Days
• Field of Search: 315/307, 315/291, 315/254, 363/15
• US Class Current: 1/1
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A rectifier rectifies an alternating current power to obtain a direct current power. The rectifier sends the direct current power to a driving power and synchronous signal generation apparatus. The driving power and synchronous signal generation apparatus generates a driving power. The driving power and synchronous signal generation apparatus sends the driving power through a transmission line to a plurality of light emitting diode driving apparatuses to drive a plurality of light emitting diodes. The driving power and synchronous signal generation apparatus generates a synchronous signal regularly according to the direct current power. The driving power and synchronous signal generation apparatus sends the synchronous signal through the transmission line to the light emitting diode driving apparatuses. The light emitting diode driving apparatuses drive the light emitting diodes synchronously according to the synchronous signals.

Claims

1. A light emitting diode driving system applied to a rectifier and a plurality of light emitting diodes, the light emitting diode driving system comprising:

a driving power and synchronous signal generation apparatus electrically connected to the rectifier;

a transmission line electrically connected to the driving power and synchronous signal generation apparatus; and

a plurality of light emitting diode driving apparatuses electrically connected to the transmission line, the driving power and synchronous signal generation apparatus and the light emitting diodes,

wherein the light emitting diode driving apparatus comprises;

a power positive terminal electrically connected to the driving power and synchronous signal generation apparatus;

a voltage regulator electrically connected to the power positive terminal;

a power negative terminal electrically connected to the voltage regulator;

a signal detector electrically connected to the power positive terminal;

a synchronous control logic circuit electrically connected to the voltage regulator, the power negative terminal and the signal detector; and

a light changing control circuit electrically connected to the voltage regulator, the power negative terminal and the synchronous control logic circuit,

wherein the rectifier rectifies an alternating current power to obtain a direct current power;

the rectifier sends the direct current power to the driving power and synchronous signal generation apparatus;

the driving power and synchronous signal generation apparatus generates a driving power;

the driving power and synchronous signal generation apparatus sends the driving power through the transmission line to the light emitting diode driving apparatuses to drive the light emitting diodes;

wherein the driving power and synchronous signal generation apparatus generates a synchronous signal regularly according to the direct current power;

the driving power and synchronous signal generation apparatus sends the synchronous signal through the transmission line to the light emitting diode driving apparatuses;

the light emitting diode driving apparatuses drive the light emitting diodes synchronously according to the synchronous signals.

2. The light emitting diode driving system in claim 1, wherein the light emitting diode driving apparatus further comprises:

an oscillator electrically connected to the voltage regulator, the power negative terminal, the synchronous control logic circuit and the light changing control circuit.

3. The light emitting diode driving system in claim 2, wherein the light emitting diode driving apparatus further comprises:

a driving current control circuit electrically connected to the voltage regulator, the power negative terminal and the light changing control circuit.

4. The light emitting diode driving system in claim 3, wherein the light emitting diode driving apparatus further comprises:

a plurality of driving current output circuits electrically connected to the driving current control circuit and the light emitting diodes.

5. The light emitting diode driving system in claim 4, wherein the driving power and synchronous signal generation apparatus comprises:

a first resistor electrically connected to the rectifier;

a second resistor electrically connected to the first resistor;

a first diode electrically connected to the rectifier and the first resistor;

a first capacitor electrically connected to the first diode;

a third resistor electrically connected to the first diode; and

a first transistor electrically connected to the first resistor, the second resistor and the third resistor.

6. The light emitting diode driving system in claim 5, wherein the driving power and synchronous signal generation apparatus further comprises:

a fourth resistor electrically connected to the third resistor and the first transistor;

a second transistor electrically connected to the first diode and the power positive terminal;

a fifth resistor electrically connected to the power positive terminal and the second transistor; and

a second capacitor electrically connected to the power positive terminal and the second transistor.

7. The light emitting diode driving system in claim 5, wherein the driving power and synchronous signal generation apparatus further comprises:

a fourth resistor electrically connected to the third resistor;

a second transistor electrically connected to the first diode;

a fifth resistor electrically connected to the first diode;

a second capacitor electrically connected to the power positive terminal;

a second diode electrically connected to the power positive terminal, the second capacitor and the first diode;

a sixth resistor electrically connected to the fifth resistor, the first transistor and the second transistor; and

a seventh resistor electrically connected to the second transistor and the second capacitor.

8. The light emitting diode driving system in claim 5, wherein the driving power and synchronous signal generation apparatus further comprises:

a fourth resistor electrically connected to the first diode;

a second transistor electrically connected to the first diode;

a fifth resistor electrically connected to the fourth resistor and the second transistor;

a second capacitor electrically connected to the power positive terminal;

a second diode electrically connected to the power positive terminal, the second capacitor and the first diode;

a sixth resistor electrically connected to the second transistor and the second capacitor; and

a third transistor electrically connected to the first transistor, the third resistor and the fifth resistor.

9. The light emitting diode driving system in claim 5, wherein the driving power and synchronous signal generation apparatus further comprises:

a fourth resistor electrically connected to the first diode;

a second transistor electrically connected to the first diode and the power positive terminal;

a fifth resistor electrically connected to the third resistor, the first transistor and the second transistor; and

a second capacitor electrically connected to the power positive terminal and the second transistor.

10. The light emitting diode driving system in claim 9, wherein the driving power and synchronous signal generation apparatus further comprises:

a sixth resistor electrically connected to the power positive terminal and the second transistor;

a third transistor electrically connected to the first resistor, the second resistor, the first transistor and the fourth resistor;

a seventh resistor electrically connected to the sixth resistor; and

a fourth transistor electrically connected to the fourth resistor, the third transistor and the second capacitor.