CA2613242A1 - Dimmer having a microprocessor-controlled power supply - Google Patents

Dimmer having a microprocessor-controlled power supply Download PDF

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Publication number
CA2613242A1
CA2613242A1 CA002613242A CA2613242A CA2613242A1 CA 2613242 A1 CA2613242 A1 CA 2613242A1 CA 002613242 A CA002613242 A CA 002613242A CA 2613242 A CA2613242 A CA 2613242A CA 2613242 A1 CA2613242 A1 CA 2613242A1
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CA
Canada
Prior art keywords
voltage
power supply
storage element
energy storage
controllably conductive
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Granted
Application number
CA002613242A
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French (fr)
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CA2613242C (en
Inventor
Robert C. Newman, Jr.
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Lutron Technology Co LLC
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Individual
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/044—Controlling the light-intensity of the source continuously
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/044—Controlling the light-intensity of the source continuously
    • H05B39/048—Controlling the light-intensity of the source continuously with reverse phase control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/905—Lamp dimmer structure

Abstract

A power supply for a two-wire load control device supplies power to a microprocessor, in turn controlling the power supply which comprises an ener gy storage element, e.g., a capacitor, for producing a DC voltage for powering the microprocessor and also includes a high impedance circuit for allowing t he energy storage element to receive energy at a first rate before the DC volta ge is produced and the microprocessor is powered. The power supply further comprises a low-impedance circuit, i.e., a resistor in series electrical connection with a controllably conductive device, for allowing the energy storage element to receive energy at a second rate greater than the first rate. After starting up, the microprocessor selectively enables and disables the second energy-receiving circuit by rendering the controllably conductive device conductive and non-conductive, respectively. The microprocessor monitors the power supply and to control the amount of power delivered to an electrical load.

Claims (46)

1. A two-wire load control device (400) for control of power delivered to an electrical load (408) from a source of AC voltage (404), wherein the two-load control device comprises a first controllably conductive device (410) adapted to be operatively coupled to the source of AC voltage and to the electrical load for controlling the power delivered to the load, the two-wire load control device further comprises a microprocessor (414) coupled to the first controllably conductive device for controlling the first controllably conductive device, the two-wire load control device further comprises a power supply (422) adapted to be coupled to the source of AC voltage and coupled to the microprocessor for generating a DC voltage (V CC) to power the microprocessor, characterized in that:
the power supply includes an energy storage element (C510) and a second controllably conductive device (Q514) for controllably storing energy in the energy storage element, wherein the microprocessor is operatively coupled to the second controllably conductive device to control the second controllably conductive device.
2. The load control device of claim 1, wherein the power supply further comprises a low impedance circuit in series electrical connection with the second controllably conductive device and a high impedance circuit in parallel electrical connection with the series combination of the low impedance circuit and the second controllably conductive device;
wherein when the second controllably conductive device is non-conductive, the energy storage element is operable to receive energy through the high impedance circuit, and when the second controllably conductive device is conductive, the energy storage element is operable to receive energy through the low impedance circuit.
3. The load control device of claim 2, wherein the microprocessor monitors the power supply in order to determine whether the energy storage element is receiving energy through the low impedance circuit.
4. The load control device of claim 3, wherein the power supply further comprises a hardware shut-off circuit for causing the second controllably conductive device to become non-conductive when the DC voltage exceeds a predetermined threshold.
5. The load control device of claim 4, wherein the microprocessor controls the second controllably conductive device to become conductive at a predetermined time after a zero-crossing of the AC voltage.
6. The load control device of claim 4, wherein the microprocessor controls the second controllably conductive device to become non-conductive before the DC
voltage exceeds the predetermined threshold.
7. The load control device of claim 3, wherein the microprocessor is operable to control the first controllably conductive device in order to control the power delivered to the electrical load in response to monitoring the power supply.
8. The load control device of claim 3, further comprising:
a low-voltage load powered by the DC voltage of the power supply and operable to draw a current from the energy storage element of the power supply;
wherein the microprocessor is operable to control the first controllably conductive device in order to control the power delivered to the electrical load in response to the current drawn by the low-voltage load.
9. The load control device of claim 3, further comprising:
a low-voltage load powered by the DC voltage of the power supply and operable to draw a current from the energy storage element of the power supply;
wherein the microprocessor is operable to control the amount of current drawn by the low-voltage load in response to monitoring the power supply.
10. The load control device of claim 2, wherein the microprocessor controls the second controllably conductive device to become conductive at a predetermined time after a zero-crossing of the AC voltage.
11. The load control device of claim 2, wherein the microprocessor controls the second controllably conductive device to become non-conductive at a predetermined time after a zero-crossing of the AC voltage.
12. The load control device of claim 2, wherein the power supply further comprises a hardware shut-off circuit for causing the second controllably conductive device to become non-conductive when the DC voltage exceeds a predetermined threshold.
13. The load control device of claim 2, further comprising:
a low-voltage load powered by the DC voltage of the power supply and operable to draw a current from the energy storage element of the power supply;
wherein the microprocessor is operable to control the amount of current drawn by the low-voltage load to substantially zero amps for a predetermined number of half-cycles of the AC voltage after a startup of the microprocessor.
14. The load control device of claim 2, wherein the power supply further comprises a third controllably conductive device (Q540) in series electrical connection with the high impedance circuit, the microprocessor operable to control the third controllably conductive device.
15. A two-wire load control device (400) for control of a load (408) from a source of AC voltage 404, wherein the two-wire load control device comprises a first controllably conductive device (410) adapted to be coupled in series electrical connection between the load and the source of AC voltage, and the two-wire load control device further comprises a power supply (422), characterized in that:
the power supply comprises a controllable impedance coupled in series electrical connection with an energy storage element (C5 10), the power supply operable to provide a DC voltage (V CC) to the energy storage element, the energy storage element operable to receive energy when the first controllably conductive device is non-conductive;
and a controller (414) powered by the DC voltage of the power supply and coupled to the first controllably conductive device and the controllable impedance for control of the first controllably conductive device and the controllable impedance, respectively, wherein the controller is operable to control the controllable impedance to a first impedance value to cause the energy storage element to receive energy at a first rate and to control the controllable impedance to a second impedance value to cause the energy storage element to receive energy at a second rate, wherein the second impedance value is substantially smaller than the first impedance value.
16. The load control device of claim 15, wherein the controllable impedance comprises a first resistor (R516) in series electrical connection with a second controllably conductive device (Q514), wherein the controller is operable to control the second controllably conductive device.
17. The load control device of claim 16, wherein the controllable impedance comprises a second resistor (R512) in parallel electrical connection with the series combination of the second controllably conductive device and the first resistor.
18. A two-wire load control device (400) for control of a load (408) from a source of AC voltage (404), wherein the two-wire load control device comprises a controllably conductive device (410) adapted to be coupled in series electrical connection between the load and the source of AC voltage, and wherein the two-wire load control device further comprises a power supply (422), characterized in that:
the power supply comprises an energy storage element (C510), a first energy-receiving circuit for the energy storage element, and a second energy-receiving circuit for the energy storage element, the first energy-receiving circuit allowing the energy storage element to receive energy at a first rate, the second energy-receiving circuit allowing the energy storage element to receive energy at a second rate greater than the first rate, the power supply operable to store energy in the energy storage element when the controllably conductive device is non-conductive, the power supply producing a DC voltage (V CC), and the load control device further comprises a controller (414) powered by the DC voltage of the power supply, the controller operable to control the controllably conductive device and coupled to the power supply to selectively enable and disable the second energy-receiving circuit.
19. A two-wire load control device (400) for control of power delivered to an electrical load (408) from a source of AC voltage, wherein the two-wire load control device comprises a first controllably conductive device (410) adapted to be operatively coupled to the source (404) of AC voltage and to the electrical load for controlling the power delivered to the load, a microprocessor (414) coupled to the first controllably conductive device for controlling the first controllably conductive device, and a power supply (422) adapted to be coupled to the source of AC voltage and coupled to the microprocessor for generating a DC voltage (V CC) to power the microprocessor, characterized in that:
the power supply comprises an energy storage element (C510), and the power supply further comprises a second controllably conductive device (Q514) operatively coupled to the microprocessor and operable to controllably store energy in the energy storage element in response to the microprocessor, and the power supply further comprises a low impedance circuit in series electrical connection with the second controllably conductive device, and the power supply further comprises a high impedance circuit in parallel electrical connection with the series combination of the low impedance circuit and the second controllably conductive device, wherein when the second controllably conductive device is non-conductive, the energy storage element is operable to receive energy through the high impedance circuit, and when the second controllably conductive device is conductive, the energy storage element is operable to receive energy through the low impedance circuit, and wherein the microprocessor monitors the power supply in order to determine whether the energy storage element is receiving energy through the low impedance circuit.
20. A power supply (422) for a two-wire load control device (400) for controlling a load (408) from a source of AC voltage (404), the load control device having a controller (414),, the power supply characterized in that:
the power supply comprises an energy storage element (C510) operable to produce a DC voltage (V CC) for powering the controller, and the power supply further comprises a first energy-receiving circuit for allowing the energy storage element to receive energy at a first rate and the power supply further comprises a second energy-receiving circuit for allowing the energy storage element to receive energy at a second rate greater than the first rate, wherein the controller is powered by the DC voltage and is operable to control the power supply to selectively enable and disable the second energy-receiving circuit.
21. The power supply of claim 20, wherein the second energy-receiving circuit comprises a first controllably conductive device (Q514) having a control input, the energy storage element operable to receive energy at the second rate when the first controllably conductive device is conductive;
wherein the controller is operable to render the controllably conductive device conductive and non-conductive.
22. The power supply of claim 21, further comprising:
a hardware shut-off circuit operable to render the first controllably conductive device non-conductive when the DC voltage exceeds a predetermined threshold.
23. The power supply of claim 22, further comprising:
a second controllably conductive device switch (Q518) having a control input and coupled between the DC voltage and the control input of the first controllably conductive device;
wherein the first controllably conductive device is rendered conductive when the second controllably conductive device is conductive.
24. The power supply of claim 23, wherein the hardware shut-off circuit comprises:
a third controllably conductive device (Q536) having a control input and coupled between the DC voltage and the control input of the second controllably conductive device;
a resistor (R532) coupled to the DC voltage and the control input of the third controllably conductive device; and a zener diode (Z534) having a cathode coupled to the junction of the resistor and the control input of the third controllably conductive device; the series combination of the resistor and the zener diode connected in parallel electrical connection with the energy storage element;
wherein the third controllably conductive device is rendered conductive when the voltage across the zener diode exceeds the break-over voltage of the zener diode.
25. The power supply of claim 22, wherein the controller is operable to render the first controllably conductive device non-conductive before the DC
voltage exceeds the predetermined threshold.
26. The power supply of claim 22, wherein the controller is coupled to the hardware shut-off circuit and is operable to determine if the hardware shut-off circuit is rendering the first controllably conductive device non-conductive.
27. The power supply of claim 21, wherein the second energy-receiving circuit comprises a first resistor (R516) in series electrical connection with the first controllably conductive device.
28. The power supply of claim 27, wherein the first energy-receiving circuit comprises a second resistor (R512) in parallel electrical connection with the series combination of the first controllably conductive device and the first resistor.
29. The power supply of claim 28, wherein the first energy-receiving circuit further comprises a second controllably conductive device (Q540) in series electrical connection with the second resistor; the controller operable to render the second controllably conductive device conductive and non-conductive.
30. The power supply of claim 21, wherein the first controllably conductive device comprises a semiconductor switch.
31. The power supply of claim 30, wherein the semiconductor switch comprises a bipolar junction transistor.
32. A method for generating a DC voltage (V CC) in a two-wire load control device (400) for controlling the power delivered from an AC power source (404) to an electrical load (408), characterized in that:
the method comprises the step of generating the DC voltage across an energy storage element (C510), and the method further comprises the step of providing the DC
voltage to a controller (414) of the load control device, and the method further comprises the step of controlling the time constant with which the energy storage element charges.
33. The method of claim 32, wherein the step of controlling the time constant comprises selectively charging the energy storage element with a first time constant and with a second time constant greater than the first rate in response to the controller.
34. The method of claim 33, wherein the step of controlling the time constant further comprises charging the energy storage element with the second time constant after a second predetermined time after the zero-crossing of the AC voltage of the AC power source, the second predetermined time closer to the zero-crossing than the first predetermined time.
35. The method of claim 34, wherein the step of controlling the rate further comprises providing a hardware shut-off circuit coupled to the energy storage element for causing the energy storage element to stop charging with the second time constant.
36. The method of claim 35, further comprising the step of:
monitoring the hardware shut-off circuit to determine whether the energy storage element has stopped charging with the second time constant.
37. The method of claim 36, wherein the step of controlling the time constant further comprises causing the energy storage element to stop charging with the second time constant before the hardware shut-off circuit causes the energy storage element to stop charging with the second time constant.
38. The method of claim 36, further comprising the step of:
controlling the power delivered to the electrical load in response to the step of monitoring the hardware shut-off circuit.
39. The method of claim 36, further comprising the steps of:
providing a low-voltage load powered by the DC voltage and operable to draw a current from the energy storage element; and controlling the power delivered to the electrical load in response to the current drawn by the low-voltage load.
40. The method of claim 36, further comprising the steps of:
providing a low-voltage load powered by the DC voltage and operable to draw a current from the energy storage element; and controlling the amount of current drawn by the low-voltage load in response to step of monitoring the hardware shut-off circuit.
41. The method of claim 33, further comprising the step of:
determining if the DC voltage has exceeded a predetermined voltage;
wherein the step of controlling the time constant further comprises charging the energy storage element with the second time constant when the DC voltage is below the predetermined voltage.
42. The method of claim 41, wherein the step of controlling the time constant further comprises charging the energy storage element with the second time constant before a first predetermined time after a zero-crossing of an AC voltage of the AC power source.
43. The method of claim 33, wherein the step of controlling the time constant further comprises charging the energy storage element at the first time constant before a startup of the controller.
44. The method of claim 43, further comprising the step of:
determining if the DC voltage has exceeded a predetermined voltage;
wherein the step of controlling the time constant comprises selectively charging the energy storage element with a third time constant when the DC
voltage is above the predetermined voltage, the third time constant equal to substantially large such that the energy storage element is prevented from charging.
45. The method of claim 34, further comprising the steps of:
providing a low-voltage load powered by the DC voltage and operable to draw a current from the energy storage element; and controlling the amount of current drawn by the low-voltage load to substantially zero amps for a predetermined number of half-cycles of the AC
voltage after a startup of the controller.
46. A method for generating a DC voltage (V CC) in a two-wire load control device (400) and providing the DC voltage to a controller (414) of the load control device, characterized in that:
the method comprises the step of generating the DC voltage across an energy storage element (C510), the method further comprises the step of selectively allowing the energy storage element to receive energy at a first rate and at a second rate greater than the first rate in response to the controller, and the method further comprises the step of determining when the DC voltage exceeds a predetermined voltage, wherein the step of controlling the rate further comprises allowing the energy storage element to receive energy at the second rate when the DC voltage is below the predetermined voltage.
CA2613242A 2005-06-30 2006-06-30 Dimmer having a microprocessor-controlled power supply Active CA2613242C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US69578405P 2005-06-30 2005-06-30
US60/695,784 2005-06-30
PCT/US2006/025662 WO2007005651A2 (en) 2005-06-30 2006-06-30 Dimmer having a microprocessor-controlled power supply

Publications (2)

Publication Number Publication Date
CA2613242A1 true CA2613242A1 (en) 2007-01-11
CA2613242C CA2613242C (en) 2012-12-11

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US (3) US7546473B2 (en)
EP (1) EP1897419B1 (en)
JP (1) JP4729617B2 (en)
CN (1) CN101213885B (en)
AU (1) AU2006265902C1 (en)
BR (1) BRPI0613294A2 (en)
CA (1) CA2613242C (en)
IL (1) IL188332A (en)
MX (1) MX2008000321A (en)
WO (1) WO2007005651A2 (en)

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