Optical Coupling Device

• US 20060197112A1
• Filed: 12/02/2005
• Published: 09/07/2006
• Est. Priority Date: 12/02/2004
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nishimura, Takashi, Uchihara, Takeshi, Usui, Yasunori
• Application Number:
  US11/275,020
• Publication Number:
  US 20060197112A1
• Time in Patent Office: Days
• US Class Current: 257/213
• CPC Class Codes: H01L 31/12 structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto semiconductor devices with at least one potential barrier or surface barrier adapted for light emission H01L33/00; amplifiers using electroluminescent element and photocell H03F17/00; electroluminescent light sources per se H05B33/00
• CPC Class Codes: H03K 17/78 using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
• CPC Class Codes: H03K 17/785 controlling field-effect transistor switches

Abstract

In various aspects, an optical coupling device may include a light emitting element configured to emit an optical signal; a photo receiving element having a serial connected of photo diodes, the photo receiving element configured to receive the optical signal and generate an electrical signal; and a control circuit having an active element, a source and a drain of the active element connected to both ends of the photo receiving element; wherein the breakdown voltage of the control circuit is no more than an open circuit voltage of the photo receiving element.

Claims

1. An optical coupling device, comprising:

a light emitting element configured to emit an optical signal;

a photo receiving element having serial connected photo diodes, the photo receiving element configured to receive the optical signal and generate an electrical signal; and

a control circuit having an active element, a source and a drain of the active element connected to both ends of the photo receiving element;

wherein a breakdown voltage of the control circuit is less than or equal to an open circuit voltage of the photo receiving element.

2. An optical coupling device of claim 1, further comprising an output element connected to the control circuit, the output element controlled by the control circuit.

3. An optical coupling device of claim 2, wherein the output element is a MOSFET and the output element is connected to a source and a gate of the MOSFET.

4. An optical coupling device of claim 1, wherein a number of the photodiode array connected serially is defined as n, the breakdown voltage of the control circuit is no more than 0.55×

n (V).

5. An optical coupling device of claim 1, wherein the active element is one of a

6. An optical coupling device of claim 1, further comprising a constant voltage diode connected between both ends of the photo receiving element.

7. An optical coupling device of claim 3, further comprising a constant voltage diode connected between both ends of the photo receiving element.

8. An optical coupling device of claim 4, further comprising a constant voltage diode connected between both ends of the photo receiving element.

9. An optical coupling device of claim 2, wherein a number of the photodiode array connected serially is defined as n, the breakdown voltage of the control circuit is no more than 0.55×

n (V).

10. An optical coupling device of claim 6, wherein a number of the photodiode array connected serially is defined as n, the breakdown voltage of the control circuit is no more than 0.55×

n (V).

11. An optical coupling device, comprising:

a light emitting element configured to emit an optical signal;

a photo receiving element having serial connected photo diodes, the photo receiving element configured to receive the optical signal and generate an electrical signal; and

an active element connected to the photo receiving element, a source and a drain of the active element connected to both ends of the photo receiving element;

wherein a breakdown voltage of the active element is no more than an open circuit voltage of the photo receiving element.

12. An optical coupling device of claim 11, further comprising an output element connected to the control circuit, the output element controlled by the control circuit.

13. An optical coupling device of claim 11, wherein the output element is a MOSFET and the output element is connected to a source and a gate of the MOSFET.

14. An optical coupling device of claim 11, wherein a number of the photodiode array connected serially is defined as n, the breakdown voltage of the control circuit is no more than 0.55×

n (V).

15. An optical coupling device of claim 11, wherein the active element is one of a MOSFET and J-FET.

16. An optical coupling device of claim 11, further comprising a constant voltage diode connected between both ends of the photo receiving element.

17. An optical coupling device of claim 13, further comprising a constant voltage diode connected between both ends of the photo receiving element.

18. An optical coupling device of claim 14, further comprising a constant voltage diode connected between both ends of the photo receiving element.

19. An optical coupling device of claim 12, wherein a number of the photodiode array connected serially is defined as n, the breakdown voltage of the control circuit is no more than 0.55×

n (V).

20. An optical coupling device of claim 16, wherein a number of the photodiode array connected serially is defined as n, the breakdown voltage of the control circuit is no more than 0.55×

n (V).