Supplemental dimming circuit for electronic LED driver

• US 8,928,238 B2
• Filed: 01/06/2012
• Issued: 01/06/2015
• Est. Priority Date: 01/06/2012
• Status: Active Grant

• Current Assignee: Eptronics, Inc.
• Original Assignee: Eptronics, Inc.
• Inventors: O'Neil, Thomas
• Primary Examiner(s): TRAN, ANH Q
• Application Number:
  US13/345,498
• Publication Number:
  US 20130175940A1
• Time in Patent Office: 1,096 Days
• Field of Search: None
• US Class Current: 315/224
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/3575 by means of dummy loads or bleeder circuits, e.g. for dimmers
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output

Abstract

A supplemental dimming circuit for an electronic led driver comprising a universal control section has a VCC3 startup and low conduction period circuit for providing a current during start-up and during low conduction periods; a CC hold current circuit for providing a hold current for the dimmer at low conduction periods; a latch circuit for providing a current draw latch on; and a PWM synchronized dimming circuit for providing a PWM signal dependent on the conduction period of the dimmer in real time. The supplemental dimming circuit also has a socket and a plug. The universal control section is on a daughter board that is pluggable to the socket. The VCC3 startup and low conduction period circuit creates a low AC voltage dummy load, which is a resistive load. The CC hold current circuit creates a low AC current dummy load that is a constant current load.

Claims

1. A supplemental dimming circuit for an electronic led driver comprising a universal control section having:

a. a VCC3 startup and low conduction period circuit for providing a current during start-up and during low conduction periods;

b. a CC hold current circuit for providing a hold current for the dimmer at low conduction periods;

c. a latch circuit for providing a current draw latch on;

d. a PWM synchronized dimming circuit for providing a PWM signal dependent on the conduction period of the dimmer in real time.

2. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 1, further comprising a socket and a plug, wherein the universal control section is on a daughter board that is pluggable to the socket.

3. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 1, wherein the VCC3 startup and low conduction period circuit creates a low AC voltage dummy load, which is a resistive load.

4. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 1, wherein the CC hold current circuit creates a low AC current dummy load which is a constant current load.

5. A supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 1, further comprising a VCC startup and low conduction period source circuit.

6. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 5, further comprising a socket and a plug, wherein the universal control section is on a daughter board that is pluggable to the socket.

7. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 5, wherein the VCC3 startup and low conduction period circuit creates a low AC voltage dummy load, which is a resistive load.

8. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 5, wherein the CC hold current circuit creates a low AC current dummy load which is a constant current load.

9. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 1, further comprising a VCC3 Normal run 15V circuit.

10. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 9, further comprising a socket and a plug, wherein the universal control section is on a daughter board that is pluggable to the socket.

11. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 9, wherein the VCC3 startup and low conduction period circuit creates a low AC voltage dummy load, which is a resistive load.

12. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 9, wherein the CC hold current circuit creates a low AC current dummy load which is a constant current load.

13. A supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 9, further comprising a VCC startup and low conduction period source circuit.

14. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 13, further comprising a socket and a plug, wherein the universal control section is on a daughter board that is pluggable to the socket.

15. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 13, wherein the VCC3 startup and low conduction period circuit creates a low AC voltage dummy load, which is a resistive load.

16. The supplemental dimming circuit for an electronic led driver comprising a universal control section of claim 13, wherein the CC hold current circuit creates a low AC current dummy load which is a constant current load.