Patent Application
20140265931
This invention generally relates to electrical power supplies, and more particularly to power supplies for LED lighting systems.
Typically, conventional power supplies are designed to provide an electrical output at a predetermined current level or at a predetermined voltage or power level. These power supplies generally include a circuitry to provide the aforementioned power, current and/or voltage levels sealed within a housing. In some cases, this circuitry is not designed to be modified and therefore is not accessible to the user. If the user requires electrical power at a variety of voltage and current levels, a separate power supply might need to be purchased for each voltage and current level desired. As such, users may be forced acquire a number of different power supplies at considerable expense.
In other cases, the power supply includes multiple wires that require measuring and selecting the appropriate wires for use in a circuit. Other power supplies have jumpers on a circuit board, or a dip switch for selecting a desired output level. These systems are error-prone and could easily result in the wrong output voltage or current being selected by the user.
Embodiments of the present invention address the aforementioned problems and represent an advancement over the current state of the art with respect to electrical power supplies. Certain advantages of the invention, as well as various inventive features thereof, will be apparent from the description of the invention provided herein.
In one aspect, embodiments of the invention provide a power supply that supplies electrical power at a predetermined level. The power supply includes circuitry configured to receive an electrical input and produce an electrical output. The power supply further includes a housing with an opening configured to receive a removable plug-in cartridge. The removable plug-in cartridge is configured to limit the electrical power output to the predetermined level. In particular embodiments, the power supply is configured to supply power to a light-emitting diode (LED) lighting system, a compact fluorescent (CFL) lighting system, or a high-intensity discharge (HID) lighting system. Further, the power supply may be configured to supply electrical power in a range from 1 watt to 100 watts, and accommodate electrical inputs ranging from 90 volts to 300 volts.
In a particular embodiment, the removable plug-in cartridge limits the power, current, or voltage output of the power supply to a predetermined current level. The removable plug-in cartridge may include a resistive or other element, or may have circuitry designed to output a constant current or voltage or power or required function of voltage and current regardless of the voltage of the electrical input.
In certain embodiments, the removable plug-in cartridge is marked with a current value, and the plug-in cartridge is configured to limit the current level of the electrical output to the current value, while in other embodiments, the removable plug-in cartridge is marked with a voltage value, and the plug-in cartridge is configured to limit the voltage level of the electrical output to the voltage value. In yet other embodiments, the removable plug-in cartridge is marked with a power value, and the plug-in cartridge is configured to limit the power level of the electrical output to the power value. The removable plug-in cartridge may also include other function-indicative coding and/or color coding to indicate function or performance of the power supply.
In an embodiment of the invention, the removable plug-in cartridge is configured to interrupt a flow path between one or more beams light sources and one or more respective photodiodes, wherein the pattern of light detected by the photodiodes determines a current or voltage value, power, or function of the electrical output. Alternatively, the circuitry and the removable plug-in cartridge may include corresponding inductively-coupled or magnetically-coupled elements, wherein a parameter of the inductively-coupled elements determines a current, voltage, power, or other functional value of the electrical output. The inductively-coupled or magnetically-coupled elements may include some combination of magnetic components and reed switches, or, in alternate embodiments, may include a Hall Effect device or other magnetic-field-sensitive device.
In a further embodiment, the circuitry for the power supply includes two connectors, and wherein the removable plug-in cartridge has two electrical terminals, each designed to be inserted into a respective one of the two connectors.
In another aspect, embodiments of the invention provide an LED driver for providing electrical power to an LED lighting unit. The LED driver includes circuitry configured to receive an electrical input and produce an electrical output. The LED driver further includes a housing with an opening configured to receive a removable plug-in cartridge. The removable plug-in cartridge is configured to limit the electrical power output to the predetermined level. Alternate embodiments of the invention include CFL and HID ballast circuits configured to provide power for either CFL or HID lighting systems.
The LED driver may be configured as a constant-current LED driver, as a constant-voltage LED driver, a constant power LED driver, or an LED driver configured to deliver some other function of voltage and current to an LED. Similarly, the CFL and/or HID ballasts may be configured to deliver constant current, constant voltage, constant power, or some other function of voltage and current.
Other aspects, objectives and advantages of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention and, together with the description, serve to explain the principles of the invention. In the drawings:
While the invention will be described in connection with certain preferred embodiments, there is no intent to limit it to those embodiments. On the contrary, the intent is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the invention as defined by the appended claims.
While embodiments of the present invention are described herein with respect to their use in Light-Emitting Diode (LED), compact fluorescent light (CFL), and high-intensity discharge (HID) lighting systems, one of skill in the art will recognize that the invention is not necessarily limited to this type of application. Nothing disclosed herein is intended to limit the invention to use with LED, CFL, or HID lighting systems. It is envisioned that the subject matter of this application may find uses in other types of lighting systems, or in any number of applications where electrical power is desired at a constant current or constant voltage.
Power supplies for the aforementioned lighting systems, also referred to as LED drivers, CFL ballasts, or HID ballasts may provide AC power or DC power depending on the design of the lighting system. DC lighting system power supplies may be configured to supply either constant current or constant voltage. For example, constant-current LED drivers are typically used to drive a group of LEDs wired in series, while constant-voltage LED drivers are typically used to drive a group of LEDs wired in parallel. The power output of these power supplies may vary widely. For example, systems that provide electrical power from 1 watt to 100 watts are typical. Further, these systems may be capable of accepting a wide range of input voltages, for example from 90 volts to over 300 volts.
However, the embodiment of
In certain embodiments, the removable plug-in cartridge 112 is configured to limit the current output from a constant current power supply to a predetermined current level, or in alternate embodiments, configured to limit the voltage output from a constant voltage power supply to a predetermined level of voltage, power, or function of voltage and current. The removable plug-in cartridge 112 may be a resistive element, or may have circuitry configured to output a constant current despite fluctuations in the voltage of the electrical input. Alternatively, the removable plug-in cartridge 112 may have circuitry configured to output a voltage despite fluctuations in the voltage of the electrical input.
In a particular embodiment, the circuitry 106 includes two receptacles 118, and the removable plug-in cartridge 112 includes two terminals 116, each designed for insertion into a respective one of the two mating receptacles 118. As can be seen from
Thus, a user can fashion a power supply to provide any number of desired output currents, voltages, power, or function of voltage and current by merely swapping out the removable plug-in cartridge 112 for one with the desired current, voltage, power, or function rating. As such, one power supply can satisfy a wide range of user needs. Also, because the current, voltage, power, or function to be output by the power supply is clearly shown, via text or color coding for example, on the plug-in cartridge, user-caused errors are less likely.
In another embodiment of the invention, the power supply 100 includes a non-contact means for selecting power supply output current, or output voltage, such as, but not limited to, the interruption of a beam of light from an LED to a receiving photodiode such that the power supply 100 mechanically interrupts or passes the beam causing a signal current or no-signal current to flow in the receiving photodiode, depending on the presence or non-presence of an interruptor to the beam of light from the LED. In an exemplary embodiment, a multiplicity of pairs of LEDs and photodiodes, incorporated in the circuitry 106, can be arranged to coincide with possible light paths, which may be arranged so as to interrupt or allow the passage of light between the LED and the photodiode. The removable plug-in cartridge 112 may be configured to interrupt light beams in the manner described. In such an arrangement of pairs of LEDs and photodiodes, the electrical signal from the photodiode can be decoded, in at least one instance, as a binary number such that certain binary numbers correspond to certain power supply 100 output currents, voltages, power, or function or voltage and current.
In alternate embodiments, other non-contact means for selecting power supply 100 output current or voltage are also envisioned. These include, but are not limited to, power supplies 100 in which the removable plug-in cartridge 112 includes some combination of magnetic parts with reed switches or Hall Effect devices arranged to encode power supply 100 output currents or voltages, and non-contact means having inductively-coupled elements where a parameter of the inductively-coupled elements is read and may correspond to a particular driver output current or voltage of the power supply 100. It should be noted that other non-contact means for selecting or adjusting power supply 100 output current or voltage not mentioned here are not excluded from the invention.
All references, including publications, patent applications, and patents cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) is to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
