DRIVING DEVICE, OPTICAL EMITTER, AND OPERATION METHOD THEREOF

• US 20140133866A1
• Filed: 12/28/2012
• Published: 05/15/2014
• Est. Priority Date: 11/14/2012
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Yeh, Chien-Hung, Liu, Yu-Feng, Chow, Chi-Wai
• Application Number:
  US13/730,304
• Publication Number:
  US 20140133866A1
• Time in Patent Office: Days
• US Class Current: 398/182
• CPC Class Codes: H04L 27/04 Modulator circuits; Transmitter circuits
• CPC Class Codes: H05B 47/165 following a pre-assigned programmed sequence; Logic control [LC]
• CPC Class Codes: H05B 47/195 the transmission using visible or infrared light

Abstract

A driving device adapted to at least one light emitting diode, includes a clock recovery unit, a modulation unit, and a bias tee unit. The clock recovery unit receives a first alternating current signal, and generates a square wave signal according to the first alternating current signal. The modulation unit is coupled to the clock recovery unit, for receiving the square wave signal and a signal source, and for generating a message signal by using the square wave signal and the signal source. The bias tee signal is coupled to the modulation unit, for receiving a second alternating current signal and the message signal, and for outputting a driving signal to at least one light emitting diode by using the second alternating current signal and the message signal, in order to make at least one light emitting diode generate an optical signal.

Claims

1. A driving device, adapted to drive at least one light emitting diode (LED), and comprising:

a clock recovery unit, for receiving a first alternating current (AC) signal, and generating a square wave signal according to the first alternating current signal;

a modulation unit, coupled to the clock recovery unit, for receiving the square wave signal and a signal source, and generating a message signal according to the square wave signal and the signal source; and

a bias tee unit, coupled to the modulation unit, for receiving a second alternating current signal and the message signal, and for outputting a driving signal to the at least one light emitting diode by using the second alternating current signal and the message signal, in order to make the at least one light emitting diode generate an optical signal.

2. The driving device according to claim 1, wherein the at least one light emitting diode includes two alternating current light emitting diodes coupled with each other in inverse parallel, and the driving device further comprises:

a voltage transformation unit, coupled to the clock recovery unit and the bias tee unit, for receiving a third alternating current signal and transforming a voltage of the third alternating current signal to generate the first alternating current signal and the second alternating current signal.

3. The driving device according to claim 1, wherein the at least one light emitting diode comprises a direct current light emitting diode, and the driving device further comprises:

a voltage transformation unit, coupled to the clock recovery unit, for receiving a fourth alternating current signal and transforming a voltage of the fourth alternating current signal to generate the first alternating current signal and a fifth alternating current signal; and

a full-wave rectification unit, coupled to the voltage transformation unit and the bias tee unit, for receiving the fifth alternating current signal and rectifying the fifth alternating current signal to generate the second alternating current signal.

4. The driving device according to claim 1, wherein the at least one light emitting diode comprises a plurality of direct current light emitting diodes which are coupled in series, and the driving device further comprises:

a full-wave rectification unit, coupled to the bias tee unit, for receiving a sixth alternating current signal and rectifying the sixth alternating current signal to generate the second alternating current signal.

5. An optical emitter, comprising:

a first signal source generation unit, for generating a first signal source;

a first clock recovery unit, for receiving a first alternating current signal, and generating a first square wave signal according to the first alternating current signal;

a first modulation unit, coupled to the first clock recovery unit, for receiving the first square wave signal and the first signal source, and for generating a first message signal according to the first square wave signal and the first signal source;

a first bias tee unit, coupled to the first modulation unit, for receiving a second alternating current signal and the first message signal, and for generating a first driving signal by using the second alternating current signal and the first message signal; and

at least one first light emitting diode, coupled to the first bias tee unit, for receiving the first driving signal, to generate a first optical signal.

6. The optical emitter according to claim 5, wherein the at least one first light emitting diode comprises a plurality of first alternating current light emitting diodes which are coupled in series, and a plurality of second alternating current light emitting diodes which are coupled in series, the series of the plurality of first alternating current light emitting diodes and the series of the plurality of second alternating current light emitting diodes are coupled in inverse parallel.

7. The optical emitter according to claim 5, wherein the at least one first light emitting diode comprises two alternating current light emitting diodes which are coupled in inverse parallel, and the optical emitter further comprises:

a voltage transformation unit, coupled to the first clock recovery unit and the first bias tee unit, for receiving a third alternating current signal and transforming a voltage of the third alternating current signal to generate the first alternating current signal and the second alternating current signal.

8. The optical emitter according to claim 5, wherein the at least one first light emitting diode comprises a direct current light emitting diode, and the optical emitter further comprises:

a voltage transformation unit, coupled to the first clock recovery unit, for receiving a fourth alternating current signal and transforming a voltage of the fourth alternating current signal to generate the first alternating current signal and a fifth alternating current signal; and

a full-wave rectification unit, coupled to the voltage transformation unit and the first bias tee unit, for receiving the fifth alternating current signal and rectifying the fifth alternating current signal to generate the second alternating current signal.

9. The optical emitter according to claim 5, wherein the at least one first light emitting diode comprises a plurality of direct current light emitting diodes which are coupled in series, and the optical emitter further comprises:

a full-wave rectification unit, coupled to the first bias tee unit, for receiving a sixth alternating current signal and rectifying the sixth alternating current signal to generate the second alternating current signal.

10. The optical emitter according to claim 5, further comprising:

a phase shift unit, for receiving the first alternating current signal and the second alternating current signal, and for shifting the first alternating current signal and the second alternating current signal to generate a first shifted alternating current signal and a second shifted alternating current signal;

a second signal source generation unit, for generating a second signal source;

a second clock recovery unit, for receiving the first shifted alternating current signal, and generating a second square wave signal according to the first shifted alternating current signal;

a second modulation unit, coupled to the second clock recovery unit and the second signal source generation unit, for receiving the second square wave signal and the second signal source, and for generating a second message signal according to the second square wave signal and the second signal source;

a second bias tee unit, coupled to the second modulation unit, for receiving the second shifted alternating current signal and the second message signal, and for generating a second driving signal by using the second shifted alternating current signal and the second message signal; and

at least one second light emitting diode, coupled to the second bias tee unit, for receiving a second optical signal generated by the second driving signal.

11. The optical emitter according to claim 10, wherein the at least one second light emitting diode comprises a plurality of first alternating current light emitting diodes which are coupled in series, and a plurality of second alternating current light emitting diodes which are coupled in series, the series of the plurality of first alternating current light emitting diodes and the series of the plurality of second alternating current light emitting diodes are coupled in inverse parallel.

12. The optical emitter according to claim 10, wherein the at least one second light emitting diode comprises two alternating current light emitting diodes which are coupled in inverse parallel, and the optical emitter further comprises:

a voltage transformation unit, coupled to the second clock recovery unit and the second bias tee unit, for receiving a third alternating current signal and transforming a voltage of the third alternating current signal to generate the first alternating current signal and the second alternating current signal.

13. The optical emitter according to claim 10, wherein the at least one second light emitting diode comprises a direct current light emitting diode, and the optical emitter further comprises:

a voltage transformation unit, coupled to the second clock recovery unit, for receiving a fourth alternating current signal and transforming a voltage of the fourth alternating current signal to generate the first alternating current signal and a fifth alternating current signal; and

a full-wave rectification unit, coupled to the voltage transformation unit and the second bias tee unit, for receiving the fifth alternating current signal and rectifying the fifth alternating current signal to generate the second alternating current signal.

14. The optical emitter according to claim 10, wherein the at least one second light emitting diode comprises a plurality of direct current light emitting diodes which are coupled in series, and the optical emitter further comprises:

a full-wave rectification unit, coupled to the second bias tee unit, for receiving a sixth alternating current signal, and for rectifying the sixth alternating current signal to generate the second alternating current signal.

15. An operation method of an optical emitter, comprising:

providing a first signal source;

receiving a first alternating current signal, and generating a first square wave signal according to the first alternating current signal;

generating a first message signal according to the first square wave signal and the first signal source;

generating a first driving signal by using a second alternating current signal and the first message signal; and

driving at least one first light emitting diode by using the first driving signal to generate a first optical signal.

16. The operation method of the optical emitter according to claim 15, further comprising:

receiving the first alternating current signal and the second alternating current signal, and shifting the first alternating current signal and the second alternating current signal to generating a first shifted alternating current signal and a second shifted alternating current signal;

providing a second signal source;

receiving the first shifted alternating current signal, and generating a second square wave signal according to the first shifted alternating current signal;

receiving the second square wave signal and the second signal source, and generating a second message signal according to the second square wave signal and the second signal source;

generating a second driving signal by using the second shifted alternating current signal and the second message signal; and

driving at least one second light emitting diode by using the second driving signal to generate a second optical signal.