Remote electrical converter

• US 5,053,681 A
• Filed: 04/17/1989
• Issued: 10/01/1991
• Est. Priority Date: 04/17/1989
• Status: Expired due to Fees

• Current Assignee: LOCKWOOD, ROBERT G., 7303 FINEVALE DR., DOWNEY, CA
• Original Assignee: Robert G. Lockwood
• Inventors: Lockwood, Robert G., Budny, Bernard R.
• Primary Examiner(s): LaRoche, Eugene R.
• Assistant Examiner(s): Neyzari, Ali
• Application Number:
  US07/339,219
• Time in Patent Office: 897 Days
• Field of Search: 315/219, 315/220, 315/221, 315/277, 315/278, 315/279, 315/272, 315/224, 315/315, 315/307, 315/DIG. 2, 315/DIG. 5, 315/324, 363/35, 363/37
• US Class Current: 315/219
• CPC Class Codes: H05B 41/245 for a plurality of lamps
• CPC Class Codes: Y10S 315/05 Starting and operating circuit for fluorescent lamp

Abstract

A circuit, including an electrical load such as a fluorescent lamp, energized through an inverter which is in turn energized from a standard household alternating current voltage source. The output of the inverter is of a low voltage, low current and high frequency. This power is then transmitted by a low current voltage link, in the form of a flexible small gauge, jacketed wire conductor connected across the outputs of the inverter, to the input terminals of a compact step-up transformer located a distance away from the inverter. The power created by the step-up transformer is converted to usable power by the electrical load. The low voltage link need not be enclosed in a raceway.

Claims

1. Electrical power conversion apparatus for energizing an electrical device, such as a fluorescent lamp, from a conventional alternating current source, said apparatus comprising:

power source means for converting the conventional alternating current to a low voltage, low current, high frequency source, said power source means includes means for rectifying the conventional alternating current, inverter means connected to the output of said rectifying means for producing high frequency alternating current, and step-down transformer means for converting said high frequency alternating current to a low voltage, low current, high frequency output at the output of said step-down transformer means;

device means remote from said power source means;

power conversion means including step-up transformer means electrically coupled to said device means;

low voltage link means connected to the output of said power source means for transmitting the energy therefrom to the input of said power conversion means for enabling conversion of said low voltage, low current, high frequency source to a voltage suitable for energizing said electrical device; and

said step-up transformer means includes first and second generally identical ferrite pot core transformers having the primary windings thereof connected in parallel for providing a symmetrical current waveform to said device means.

2. The apparatus according to claim 1 wherein the output of said power source means is limited to a maximum of approximately 30 volts RMS or 43 volts at a frequency of approximately 24-30 Khz, and the output current of said power source means is limited to a maximum of 3 amperes.

3. The apparatus according to claim 1 wherein the output voltage of said power source means is electrically limited to 30 volts RMS or 43 volts peak, and said power conversion means provides power to said device means at operating voltages much greater than 30 volts RMS.

4. The apparatus to claim 1 wherein said first and second ferrite pot core transformers each have a secondary winding and a tertiary winding.

5. The apparatus according to claim 4 wherein said device means is at least one fluorescent lamp including first and second filaments, each of which is connected to a tertiary winding.

6. The apparatus according to claim 5 wherein said parallel connected primary windings form a series circuit with the secondary windings of said first and second transformers and with an inductor.

7. The apparatus according to claim 6 wherein said series circuit is connected in parallel with a capacitor across said device means, the value of the capacitor and the value of the inductor being selected to establish a generally resonant circuit for assisting in establishing and maintaining the discharge within said fluorescent lamp.

8. Electrical power apparatus for energizing a fluorescent lamp, said apparatus comprising;

means for providing a low voltage, low current, high frequency source at an output;

power conversion means electrically coupled to the fluorescent lamp, said power conversion means having an input and including step up transformer means having first and second primary windings, first and second secondary windings and first and second tertiary windings, the first and second tertiary windings being coupled to the filaments of the lamp, wherein said primary windings are connected in parallel and form a series circuit including both of said secondary windings in series with an inductor, with the series circuit so-formed connected in parallel with a capacitor across said lamp, the value of the capacitor and inductor being selected to establish a resonant circuit;

low voltage link means connected to said output for transmitting the high frequency, low current, low voltage to the input of said power conversion means for enabling conversion of the high frequency low voltage to a voltage suitable for energizing said lamp, said resonant circuit assisting to establish and maintain the gaseous discharge within said fluorescent lamp; and

wherein said means for providing a low voltage, low current, high frequency includes means coupled to a conventional alternating current source, means for rectifying the conventional alternating current, inverter means for converting the rectified output to a high frequency alternating current and step-down transformer means for providing a high frequency, low current, low voltage at said output.

9. The apparatus according to claim 8 wherein said inverter means includes first and second semiconductor means connected in push pull configuration and control thereof is effected through feedback transformer means sensing current through said semiconductor means.

10. The apparatus according to claim 9 wherein said feedback transformer means includes inductor means in series with the primary thereof for controlling saturation current to the feedback transformer means.

11. The apparatus according to claim 9 wherein said semiconductor means are transistors and said inverter means includes step-down transformer means, the output of which is high frequency, low current and low voltage.

12. The apparatus according to claim 11 wherein said conventional alternating current source is about 110 to 120 volts and the output or said inverter is limited to a maximum of approximately 30 volts RMS or 43 volts peak at a frequency of approximately 24-30 Khz.

13. The apparatus according to claim 8 wherein the output current of said inverter is limited to a maximum of 3 amperes.

14. The apparatus according to claim 13 wherein the output voltage of said inverter is electrically limited to 30 volts RMS or 43 volts peak.

15. Electrical power apparatus for energizing a two fluorescent lamp configuration, said apparatus comprising;

means for providing a low voltage, low current, high frequency source at an output;

first and second power conversion means electrically coupled respectively to one of said fluorescent lamps, each of said power conversion means having an input and including step-up transformer means having first and second primary windings, first and second secondary windings and first and second tertiary windings, the first and second tertiary windings being coupled to the respective lamp filaments, wherein said primary windings are connected in parallel and form a series circuit including both of said secondary windings, with the series circuit so-formed connected in parallel across the lamp;

an inductor connecting a selected filament terminal of one of said lamps to a selected filament terminal of the other of said lamps, said inductor assisting to establish and maintain the gaseous discharge within each of said fluorescent lamps;

low voltage link means connected to said output for transmitting the high frequency, low current, low voltage to the input of said first power conversion means;

connective means for interconnecting the inputs of said first and second power conversion means for enabling conversion of the low current, low voltage, high frequency source to a voltage suitable for energizing said lamps; and

wherein said means for providing a high frequency, low current, low voltage includes means coupled to a conventional alternating current source, means for rectifying the conventional alternating current, inverter means for converting the rectified output to a high frequency alternating current and step-down transformer means for providing a high frequency, low current, low voltage at said output.

16. The apparatus according to claim 15 wherein said connective means includes an earth ground, and said low voltage, low current, high frequency source is electrically limited to approximately 30 volts RMS or 43 volts peak at a frequency of approximately 24-30 Khz, and the output current is limited to a maximum of 3 amperes.

17. The apparatus according to claim 16 wherein said inverter means includes first and second semiconductor means connected in push pull configuration with control thereof effected through feedback transformer means sensing current through said semiconductor means, and wherein said feedback transformer means includes inductor means in series with the primary thereof for controlling saturation current to the feedback transformer means.

18. Electrical power conversion apparatus for energizing a remote electrical device from a conventional alternating current source, said apparatus comprising:

power source means including a diode rectifying bridge, a feed-back transformer, a step-down transformer, and push-pull transistor switching means for converting the conventional alternating current to a low voltage, low current, high frequency power source;

electrical device means remote from said power source means;

power conversion means having input terminals and including at least one step-up transformer and mating circuitry electrically coupled to said device means enabling conversion of the low voltage, low current, high frequency source to provide suitable ignition and steady state operating power to said device means;

low voltage link means connected between said output terminals and said input terminals for transmitting the energy from said power source means to the said conversion means; and

wherein said step-up transformer further includes two substantially identical transformers each having a primary, secondary, and tertiary winding, the primary windings being connected in parallel and forming a series circuit with the secondary windings.

19. The apparatus according to claim 18 wherein said device means is a fluorescent lamp including first and second filaments, each connected to a said tertiary winding, and said mating circuitry includes inductor and capacitance means for establishing a generally resonant circuit for assisting and maintaining the discharge within said at least one fluorescent lamp.

20. The apparatus according to claim 18 wherein:

said device means includes two fluorescent lamps;

said power conversion means includes first and second step-up transformers electrically coupled respectively to one of said fluorescent lamps, each of said step-up transformers having first and second primary windings, first and second secondary windings and first and second tertiary windings, the first and second tertiary windings being coupled to the respective lamp filaments, wherein said primary windings are connected in parallel and form a series circuit including both of said secondary windings, with the series circuit so-formed connected in parallel across the lamp;

said mating circuitry includes an inductor connecting a selected filament terminal of one of said lamps to a selected filament terminal of the other of said lamps, said inductor assisting to establish and maintain the gaseous discharge within each of said fluorescent lamps; and

wherein there is included connective means for interconnecting the inputs of said first and second step-up transformers for enabling conversion of the low current, low voltage, high frequency source to a voltage suitable for energizing said lamps.

21. The apparatus according to claim 18 wherein said conventional alternating current source is substantially 115 volts, the output or said power source means is limited to a maximum of approximately 30 volts RMS or 43 volts at a frequency of approximately 24-30 Khz, the output current of said power source means is limited to a maximum of 3 amperes, and said power conversion means provides power to said device means at operating voltages much greater than 30 volts RMS.