| |
 |
|
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 |
| 5982108 |
DC/AC converter for a discharge lamp having a DC offset at the switching element to reduce power loss |
Nov. 9, 1999 |
| 5982106 |
Self-protected series resonant electronic energy converter |
Nov. 9, 1999 |
| 5977722 |
Device for applying particular voltage waveform for operating a discharge lamp |
Nov. 2, 1999 |
| 5973455 |
Electronic ballast with filament cut-out |
Oct. 26, 1999 |
| 5973437 |
Scheme for sensing ballast lamp current |
Oct. 26, 1999 |
| 5969481 |
Power supply and electronic ballast with high efficiency voltage converter |
Oct. 19, 1999 |
| 5962987 |
Operating circuit for an electrodeless low-pressure discharge lamp |
Oct. 5, 1999 |
| 5955841 |
Ballast circuit for fluorescent lamp |
Sep. 21, 1999 |
| 5952790 |
Lamp ballast circuit with simplified starting circuit |
Sep. 14, 1999 |
| 5945785 |
Power source device with minimized variation in circuit efficiency due to variation in applied voltage to driving transformer |
Aug. 31, 1999 |
| 5945783 |
Zero energy-storage ballast for compact fluorescent lamps |
Aug. 31, 1999 |
| 5945786 |
Discharge lamp igniter with reduced noise output |
Aug. 31, 1999 |
| 5939830 |
Method and apparatus for dimming a lamp in a backlight of a liquid crystal display |
Aug. 17, 1999 |
| 5939834 |
Power supply circuit with complementary converter switches |
Aug. 17, 1999 |
| 5936360 |
Brightness controller for and method for controlling brightness of a discharge tube with optimum on/off times determined by pulse waveform |
Aug. 10, 1999 |
| 5929573 |
Switching device having varying RC time period for ignition of a lamp |
Jul. 27, 1999 |
| 5925989 |
Buck converter switching scheme |
Jul. 20, 1999 |
| 5925984 |
Circuit arrangement having LC parallel tuned drive circuitry |
Jul. 20, 1999 |
| 5925982 |
Power supply circuit for intermittently actuating a filament of a vacuum fluorescent display |
Jul. 20, 1999 |
| 5923126 |
Fluorescent lamp electronic ballast with rapid voltage turn-on after preheating |
Jul. 13, 1999 |
| 5923129 |
Apparatus and method for starting a fluorescent lamp |
Jul. 13, 1999 |
| 5914566 |
Lighting circuit for applying a negative AC voltage to a discharge lamp |
Jun. 22, 1999 |
| 5914871 |
Device for multi-stage illuminance control for light source of scanner |
Jun. 22, 1999 |
| 5898278 |
Series resonant lamp circuit having direct electrode connection between rectifier and AC source |
Apr. 27, 1999 |
| 5892327 |
Circuit arrangement for operating a discharge lamp |
Apr. 6, 1999 |
| 5889660 |
Isolated power supply for indicator light |
Mar. 30, 1999 |
| 5883473 |
Electronic Ballast with inverter protection circuit |
Mar. 16, 1999 |
| 5874810 |
Electrodeless lamp arrangement wherein the excitation coil also forms the primary of the feedback transformer used to switch the transistors of the arrangement |
Feb. 23, 1999 |
| 5872430 |
Single switch electronic ballast with low in-rush current |
Feb. 16, 1999 |
| 5872431 |
Efficient power transfer in electronic ballast |
Feb. 16, 1999 |
| 5864212 |
Control system for providing power to a gas discharge lamp |
Jan. 26, 1999 |
| RE35994 |
Variable control, current sensing ballast |
Dec. 15, 1998 |
| 5844375 |
Dual-inverter type operating circuit for generating two AC signals that are respectively provided to two lamp electrodes of a gas discharge lamp |
Dec. 1, 1998 |
| 5841239 |
Circuit for dimming compact fluorescent lamps |
Nov. 24, 1998 |
| 5841240 |
Efficient discharge lamp electrode heating circuit operable over wide temperature and power range |
Nov. 24, 1998 |
| 5841650 |
High frequency inverter |
Nov. 24, 1998 |
| 5841241 |
Electronic ballast for fluorescent lamps |
Nov. 24, 1998 |
| 5838113 |
Power supply circuit employing a differential amplifier connected to an AND gate that is in turn connected to flip-flop |
Nov. 17, 1998 |
| 5834902 |
Discharge lamp igniting and operating curcuit having interference signal suppression from 9 KHz to 100 MHz |
Nov. 10, 1998 |
| 5834903 |
Double resonant driver ballast for gas lamps |
Nov. 10, 1998 |
| 5834907 |
Cold cathode tube operating apparatus with piezoelectric transformer |
Nov. 10, 1998 |
| 5831394 |
Circuit arrangement for the production of voltage pulse sequences, in particular for the operation of dielectrically impeded discharges |
Nov. 3, 1998 |
| 5825136 |
Circuit arrangement for operating electric lamps, and an operating method for electronic lamps |
Oct. 20, 1998 |
| 5818176 |
Circuit arrangement for the operation of discharge lamps |
Oct. 6, 1998 |
| 5814948 |
Flash circuit for low cost cameras |
Sep. 29, 1998 |
| 5808421 |
Ballast circuit having dual voltage source and emergency battery |
Sep. 15, 1998 |
| 5804925 |
Modulator for generating high power electric pulses |
Sep. 8, 1998 |
| 5798615 |
Universal high intensity discharge electronic starter |
Aug. 25, 1998 |
| 5798616 |
Fluorescent lamp circuit employing both a step-up chopper and an inverter |
Aug. 25, 1998 |
| 5786670 |
High-frequency converter for fluorescent lamps using an improved trigger circuit |
Jul. 28, 1998 |
|
|
|
