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Class Information
Number: 315/219
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Periodic switch in the primary circuit of the supply transformer
Description: Systems provided with a transformer connected between the source of supply and the load device for supplying electric current or potential to the load device and having the periodic switch connected in the primary circuit of the transformer so as to periodically interrupt the primary circuit.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4988924 |
Circuit arrangement for controlling the brightness of a lamp |
Jan. 29, 1991 |
| 4982137 |
Apparatus for igniting a discharge lamp including circuitry for preventing cataphoresis phenomenon generation |
Jan. 1, 1991 |
| 4980611 |
Overvoltage shutdown circuit for excitation supply for gas discharge tubes |
Dec. 25, 1990 |
| 4973885 |
Low voltage direct current (DC) powered fluorescent lamp |
Nov. 27, 1990 |
| 4972124 |
Electronic ballast inverter |
Nov. 20, 1990 |
| 4970439 |
Power supply circuit for a gaseous discharge tube device |
Nov. 13, 1990 |
| 4963795 |
Step-controllable electronic ballast |
Oct. 16, 1990 |
| 4961029 |
Discharge lamp lighting device |
Oct. 2, 1990 |
| 4954753 |
Strobe flash lamp power supply with input voltage feedthrough afterflow prevention circuit |
Sep. 4, 1990 |
| 4954754 |
Controlled electronic ballast |
Sep. 4, 1990 |
| 4950959 |
Cassette light, powering unit therefore, multi-dynamic smart magnetic structure and method |
Aug. 21, 1990 |
| 4949017 |
Strobe trigger pulse generator |
Aug. 14, 1990 |
| 4947086 |
System for lighting fluorescent lamps |
Aug. 7, 1990 |
| 4945289 |
Electronic supply system for fluorescent tubes with electrodes |
Jul. 31, 1990 |
| 4940921 |
Combination ballast and cold cathode sealed lamp and method |
Jul. 10, 1990 |
| 4939430 |
Ignitor circuit for discharge lamps with novel ballast |
Jul. 3, 1990 |
| 4939427 |
Ground-fault-protected series-resonant ballast |
Jul. 3, 1990 |
| 4935673 |
Variable impedance electronic ballast for a gas discharge device |
Jun. 19, 1990 |
| 4933612 |
Excitation circuit for gas discharge lamp |
Jun. 12, 1990 |
| 4929873 |
Luminaire system |
May. 29, 1990 |
| 4926097 |
Ballast circuit for a fluoroescent lamp |
May. 15, 1990 |
| 4920299 |
Push-pull fluorescent dimming circuit |
Apr. 24, 1990 |
| 4918569 |
Regulated forward converter for generating repeating spark discharge pulses |
Apr. 17, 1990 |
| 4916362 |
Excitation supply for gas discharge tubes |
Apr. 10, 1990 |
| 4906901 |
Power supply for outdoor lighting systems using high frequency |
Mar. 6, 1990 |
| 4904906 |
Fluorescent light dimming |
Feb. 27, 1990 |
| 4904904 |
Electronic transformer system for powering gaseous discharge lamps |
Feb. 27, 1990 |
| 4900989 |
Magnetron feeding apparatus and method of controlling the same |
Feb. 13, 1990 |
| 4894587 |
High frequency gas discharge lamp dimming ballast |
Jan. 16, 1990 |
| 4891561 |
Neon tube lighting device |
Jan. 2, 1990 |
| RE33057 |
High frequency supply system for gas discharge lamps and electronic ballast therefor |
Sep. 12, 1989 |
| 4862040 |
Frequency-modulated inverter-type ballast |
Aug. 29, 1989 |
| 4855646 |
Fluorescent illuminator with inverter power supply |
Aug. 8, 1989 |
| 4808889 |
Circuit for fluorescent light power supply in a borehole television probe |
Feb. 28, 1989 |
| 4800323 |
Single-ended self-oscillating dc-dc converter for intermittently energized load having V.sub.BE responsive current limit circuit |
Jan. 24, 1989 |
| 4792729 |
Fluorescent lamp brightness control |
Dec. 20, 1988 |
| 4775821 |
Variable input voltage DC to DC converter with switching transistor drive current regulator |
Oct. 4, 1988 |
| 4755723 |
Strobe flash lamp power supply with afterglow prevention circuit |
Jul. 5, 1988 |
| 4733135 |
Self-regulating, no load protected electronic ballast system |
Mar. 22, 1988 |
| 4725761 |
Electroluminescent sheet assembly |
Feb. 16, 1988 |
| 4724360 |
Circuit arrangement for operating a high-pressure discharge lamp |
Feb. 9, 1988 |
| 4716342 |
Power circuit for spectral analysis gaseous discharge lamps |
Dec. 29, 1987 |
| 4704561 |
Push-pull generator |
Nov. 3, 1987 |
| 4701671 |
High-frequency oscillator-inverter ballast circuit for discharge lamps |
Oct. 20, 1987 |
| 4700113 |
Variable high frequency ballast circuit |
Oct. 13, 1987 |
| 4695770 |
Circuit for switching current in an inductive load |
Sep. 22, 1987 |
| 4694224 |
Lighting apparatus for an electric discharge lamp |
Sep. 15, 1987 |
| 4689524 |
Fluorescent lamp ballast |
Aug. 25, 1987 |
| 4686427 |
Fluorescent lamp dimming switch |
Aug. 11, 1987 |
| 4682082 |
Gas discharge lamp energization circuit |
Jul. 21, 1987 |
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