POWER SUPPLY FOR 2-LINE DIMMER

• US 20070126366A1
• Filed: 10/26/2006
• Published: 06/07/2007
• Est. Priority Date: 10/27/2005
• Status: Active Grant

• Current Assignee: Leviton Manufacturing Company Incorporated
• Original Assignee: Leviton Manufacturing Company Incorporated
• Inventors: Frid, Eugene
• Granted Patent: US 7,489,088 B2
• Time in Patent Office: Days
• US Class Current: 315/209.R
• CPC Class Codes: H02M 1/0006 Arrangements for supplying an adequate voltage to the control circuit of converters
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: H05B 39/04 Controlling
• CPC Class Codes: Y10S 315/04 Dimming circuit for fluorescent lamps

Abstract

A power supply circuit for a dimmer switching device includes a voltage doubler circuit, a filter circuit, a switching power supply, and a linear regulator circuit. In one embodiment, the voltage doubler circuit includes a first stage having a first capacitor and a first diode, and a second stage having a second capacitor and a second diode. The switching power supply may include a feedback circuit, and may be a non-isolated power supply. In an embodiment, the dimmer device is variable between an OFF position and a full ON position, and the circuit is effective to provide power for operation of the switching power supply while the dimmer device is in the full ON position.

Claims

1. A power supply circuit for providing power to internal circuits of a lighting dimmer device adapted to be connected to a source of potential, comprising:

a voltage multiplier adapted to be coupled to said source of potential to provide an output signal of at least double said source of potential;

a switching power supply coupled to said voltage multiplier to receive, as an input potential, said at least double potential from said voltage multiplier; and

a linear post regulator interposed between said switching power supply and said internal circuits.

2. A power supply circuit according to claim 1, wherein the voltage multiplier is a voltage doubler.

3. A power supply circuit according to claim 1, wherein the switching power supply is a non-isolated power supply.

4. A power supply circuit according to claim 1, wherein the switching power supply includes a feedback circuit.

5. A power supply circuit according to claim 1, further comprising a filter circuit interposed between the voltage multiplier and the switching power supply.

6. A power supply circuit according to claim 1, wherein said source of potential includes a line terminal, said line terminal being accessible for direct connection to components of the dimmer device.

7. A power supply circuit according to claim 1, wherein said source of potential is one of AC mains power, a transformer, an AC divider, and a filter.

8. A power supply circuit according to claim 1, further comprising a switching device having a line connection terminal for connection to said source of potential and a load connection terminal, and wherein the voltage multiplier is coupled to the load connection terminal.

19. A power supply circuit according to claim 1, wherein the voltage multiplier is a voltage tripler.

20. A power supply circuit according to claim 1, wherein said source of potential includes a load terminal, said load terminal being accessible for direct connection to components of the dimmer device.

21. A power supply circuit according to claim 1, wherein said source of potential represents a train of pulses and the switching power supply is utilized to power devices other than dimmers connected to said source.

22. A power supply circuit according to claim 1, further comprising a switching device having a line connection terminal for connection to said source of potential and a load connection terminal, and wherein the voltage multiplier is coupled to the line connection terminal.

9. A power supply circuit for connection to a lighting dimmer device, comprising:

a voltage doubler circuit adapted to be coupled to a source of potential;

a filter circuit connected to the voltage doubler circuit;

a switching power supply connected to the filter circuit; and

a linear regulator circuit connected to the switching power supply and coupled to an internal circuit of said dimmer device.

10. A power supply circuit according to claim 9, wherein the voltage doubler circuit includes a first stage having a first capacitor and a first diode, and a second stage having a second capacitor and a second diode.

11. A power supply circuit according to claim 9, wherein the filter circuit includes an inductor and a capacitor.

12. A power supply circuit according to claim 9, wherein the switching power supply includes a feedback circuit.

13. A power supply circuit according to claim 9, wherein the linear regulator circuit includes a linear voltage regulator and a capacitor.

14. A power supply circuit according to claim 9, wherein said source of potential is one of AC mains power, a transformer, an AC divider, and a filter.

15. A power supply circuit according to claim 9, wherein the switching power supply is a non-isolated power supply.

16. A power supply circuit according to claim 9, wherein said dimmer device is variable between an OFF position and a full ON position, and said circuit is effective to provide power for operation of the switching power supply while said dimmer device is in the full ON position.

17. A power supply circuit according to claim 9, further comprising a switching device having a line connection terminal for connection to said source of potential and a load connection terminal, and wherein the voltage doubler is coupled to the load connection terminal.

18. A power supply circuit according to claim 17, wherein the switching device includes a triac.

23. A power supply circuit according to claim 17, wherein the switching device includes a FET.

24. A power supply circuit according to claim 17, wherein the switching device includes a IGBT.