Systems and methods for converting alternating current to drive light-emitting diodes

• US 9,661,699 B2
• Filed: 06/02/2015
• Issued: 05/23/2017
• Est. Priority Date: 09/04/2014
• Status: Active Grant

• Current Assignee: Bionatus, LLC
• Original Assignee: Colorado Energy Research Technologies, LLC
• Inventors: Powell, Wayne J., Boehmer, Robert D.
• Primary Examiner(s): Tran, Thuy Vinh
• Application Number:
  US14/728,425
• Publication Number:
  US 20160073454A1
• Time in Patent Office: 721 Days
• Field of Search: 315185, 315227 R, 315276, 315291, 315299, 315299 R
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]

Abstract

A system and method for converting alternating current from at least two types of electronic ballasts for fluorescent bulbs into direct current for an array of LEDs. The device is assembled such that it can fit into existing fluorescent bulb fixtures. Alternating current from a contemplated electronic ballast can have one of two peak-to-peak voltages and the circuitry of the device will convert either alternating current into approximately the same direct current. In doing so, the array of LEDs is illuminated providing an LED alternative to fluorescent light bulbs.

Claims

1. A lighting device comprising:

a set of light-emitting diodes (LEDs) electrically coupled with each other; and

a conversion circuit electrically coupled with the set of light emitting diodes, comprising;

a first circuitry coupled with the set of LEDs and configured to convert an alternating current having a first peak-to-peak voltage into a first direct current and further configured to feed the first direct current into the set of LEDs,

a second circuitry coupled to the set of LEDs and configured to convert an alternating current having a second peak-to-peak voltage into a second direct current and further configured to feed the second direct current into the set of LEDs, and

a switching circuitry configured to switch an input alternating current between the first circuitry and the second circuitry based on a peak-to-peak voltage of the input alternating current.

2. The lighting device of claim 1, wherein the first circuitry comprises:

(1) a first set of capacitors configured to convert the alternating current having the first peak-to-peak voltage to a modified alternating current having a reduced peak-to-peak voltage based on the manufacturer'"'"'s specification for LEDs in the set of LEDs, and (2) at least one full-wave rectifier configured to convert the alternating current with the reduced peak-to-peak voltage to the first direct current.

3. The lighting device of claim 2, wherein the second circuitry comprises:

a second set of capacitors configured to convert the alternating current having the second peak-to-peak voltage to a modified alternating current having a reduced peak-to-peak voltage based on the manufacturer'"'"'s specification for the LEDs in the set of LEDs; and

at least one full-wave rectifier configured to convert the reduced alternating current to the second direct current.

4. The lighting device of claim 3, wherein a resultant capacitance of the second set of capacitors is higher than a resultant capacitance of the first set of capacitors.

5. The lighting device of claim 3, wherein the first set of capacitors makes up a subset of the second set of capacitors.

6. The lighting device of claim 1, wherein the first peak-to-peak voltage is approximately 1 kilovolt.

7. The lighting device of claim 1, wherein the second peak-to-peak voltage is approximately 2 kilovolts.

8. The lighting device of claim 1, wherein the switching circuitry comprises a set of MOSFET switches.

9. The lighting device of claim 1, wherein the switching circuitry comprises a set of TRIAC switches.

10. The lighting device of claim 1, wherein the switching circuitry comprises a set of relay switches.

11. A light-emitting diode (LED) lighting system for driving a set of LEDs having a manufacturer'"'"'s specification of a current value and a voltage value required for activating the set of LEDs, comprising:

a first circuitry coupled to the set of LEDs and configured to convert an alternating current having a first peak-to-peak voltage into a first direct current and further configured to feed the first direct current into the set of LEDs,

wherein the first circuitry comprises;

(1) a first set of capacitors configured to convert the alternating current having the first peak-to-peak voltage to a modified alternating current having a reduced peak-to-peak voltage based on the manufacturer'"'"'s specification for the set of LEDs, and (2) at least one full-wave rectifier configured to convert the alternating current with the reduced peak-to-peak voltage to the first direct current;

a second circuitry coupled to the set of LEDs and configured to convert an alternating current having a second peak-to-peak voltage into a second direct current and further configured to feed the second direct current into the set of LEDs; and

a switching circuitry configured to switch an input alternating current between the first circuitry and the second circuitry based on a peak-to-peak voltage of the input alternating current.

12. The light-emitting diode (LED) lighting system of claim 11, wherein the first peak-to-peak voltage is approximately 1 kilovolt.

13. The light-emitting diode (LED) lighting system of claim 11, wherein the second peak-to-peak voltage is approximately 2 kilovolts.

14. The light-emitting diode (LED) lighting system of claim 11, wherein the second circuitry comprises:

a second set of capacitors configured to convert the alternating current having the second peak-to-peak voltage to a modified alternating current having a reduced peak-to-peak voltage based on the manufacturer'"'"'s specification for the set of LEDs; and

at least one full-wave rectifier configured to convert the reduced alternating current to the second direct current.

15. The light-emitting diode (LED) lighting system of claim 14, wherein a resultant capacitance of the second set of capacitors is higher than a resultant capacitance of the first set of capacitors.

16. The light-emitting diode (LED) lighting system of claim 15, wherein the first set of capacitors makes up a subset of the second set of capacitors.

17. The light-emitting diode (LED) lighting system of claim 11, wherein the switching circuitry comprises a set of MOSFET switches.

18. The light-emitting diode (LED) lighting system of claim 11, wherein the switching circuitry comprises a set of TRIAC switches.

19. The light-emitting diode (LED) lighting system of claim 11, wherein the switching circuitry comprises a set of relay switches.