Flash-LED Driver Discharge Control

• US 20150077014A1
• Filed: 09/10/2014
• Published: 03/19/2015
• Est. Priority Date: 09/17/2013
• Status: Active Grant

• Current Assignee: Skyworks Solutions Incorporated
• Original Assignee: Skyworks Solutions Incorporated
• Inventors: Hariman, George A., Ng, Wendy
• Granted Patent: US 9,585,211 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 3/07 using capacitors charged and discharged alternately by semiconductor devices with control electrode , e.g. charge pumps
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: H05B 45/60 Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
• CPC Class Codes: H05B 47/17 Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations

Abstract

Various implementations include circuits, devices and/or methods that enable the repeated generation of controlled surges with lower risk of component failure. Some implementations include a discharge control assembly including a discharge circuit and a controller. In some implementations, the discharge circuit is selectively connectable to a driver circuit, and the discharge circuit is configured to provide a dominant discharge path for the driver circuit when the driver circuit is effectively decoupled from a first load in order to decay an electrical condition of the driver circuit produced prior to the driver circuit being effectively decoupled from the first load. In some implementations, the controller is configured to selectively connect the driver circuit to a combination of the discharge circuit and the first load, and in at least one combination the discharge circuit is effectively coupled to the driver circuit when the first load is effectively decoupled from the driver circuit.

Claims

1. A discharge control assembly comprising:

a discharge circuit selectively connectable to a driver circuit, the discharge circuit configured to provide a dominant discharge path for the driver circuit when the driver circuit is effectively decoupled from a first load in order to decay an electrical condition of the driver circuit produced prior to the driver circuit being effectively decoupled from the first load; and

a controller configured to selectively connect the driver circuit to a combination of the discharge circuit and the first load, and in at least one combination the discharge circuit is effectively coupled to the driver circuit when the first load is effectively decoupled from the driver circuit.

2. The discharge control assembly of claim 1 further comprising the driver circuit.

3. The discharge control assembly of claim 1 wherein the driver circuit is configured to provide an electrical surge to the first load for a first duration.

4. The discharge control assembly of claim 3 wherein the controller is configured to effectively decouple the driver circuit from the first load at the end of the first duration.

5. The discharge control assembly of claim 3 wherein the controller is configured to effectively decouple the driver circuit from the discharge circuit at the end of a second duration, the second duration extending beyond the end of the first duration.

6. The discharge control assembly of claim 5 wherein the second duration starts when the driver circuit is effectively decoupled from the first load.

7. The discharge control assembly of claim 1 wherein the controller is configured to effectively decouple the driver circuit from the discharge circuit after the driver circuit has been decoupled from the first load.

8. The discharge control assembly of claim 1 wherein the driver circuit includes an inductive element.

9. The discharge control assembly of claim 1 further comprising the first load.

10. The discharge control assembly of claim 1 wherein the first load includes one or more light emitting diodes.

11. The discharge control assembly of claim 1 wherein the first load includes a camera flash assembly.

12. A discharge control assembly module comprising:

a packaging substrate configured to receive a plurality of components;

a discharge circuit included on at least a portion of the packaging substrate, the discharge circuit selectively connectable to a driver circuit, the discharge circuit configured to provide a dominant discharge path for a driver circuit when the driver circuit is effectively decoupled from a primary intended load in order to decay an electrical condition of the driver circuit produced prior to the driver circuit being effectively decoupled from the primary intended load; and

a controller configured to selectively connect the driver circuit to a combination of the discharge circuit and the primary intended load, and in at least one combination the discharge circuit is effectively coupled to the driver circuit when the primary intended load is effectively decoupled from the driver circuit.

13. The discharge control assembly module of claim 12 further comprising the driver circuit.

14. A method of decaying an electrical condition of a driver circuit, the electrical condition produced prior to the driver circuit being effectively decoupled from a primary intended load, the method comprising:

coupling a discharge circuit to the driver circuit, the discharge circuit configured to provide a dominant discharge path for the driver circuit when the driver circuit is effectively decoupled from the primary intended load; and

decoupling the driver circuit from the primary intended load.

15. The method of claim 14 wherein the driver circuit is decoupled from the primary intended load after a first duration.

16. The method of claim 15 further comprising providing an electrical surge from the driver circuit to the primary intended load during the first duration.

17. The method of claim 15 wherein the driver circuit is coupled to the discharge circuit during the first duration.

18. The method of claim 15 further comprising decoupling the driver circuit from the discharge circuit at the end of a second duration, the second duration extending beyond the end of the first duration.

19. The method of claim 18 wherein the second duration starts when the driver circuit is effectively decoupled from the primary intended load.

20. The method of claim 14 further comprising decoupling the driver circuit from the discharge circuit after the driver circuit has been decoupled from the primary intended load.