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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 |
| 5786670 |
High-frequency converter for fluorescent lamps using an improved trigger circuit |
Jul. 28, 1998 |
| 5770923 |
Power supply for an electroluminescent panel or the like |
Jun. 23, 1998 |
| 5757140 |
Electronic ballast with frequency control |
May. 26, 1998 |
| 5757630 |
Control circuit with improved functionality for non-linear and negative resistance loads |
May. 26, 1998 |
| 5747942 |
Inverter for an electronic ballast having independent start-up and operational output voltages |
May. 5, 1998 |
| 5744915 |
Electronic ballast for instant-start lamps |
Apr. 28, 1998 |
| 5742134 |
Inverter driving scheme |
Apr. 21, 1998 |
| 5739645 |
Electronic ballast with lamp flash protection circuit |
Apr. 14, 1998 |
| 5729095 |
High frequency lighting apparatus having an intermediate potential applied to the trigger electrode to reduce leakage current |
Mar. 17, 1998 |
| 5712536 |
Reduced bus voltage integrated boost high power factor circuit |
Jan. 27, 1998 |
| 5705897 |
Apparatus for lighting alternating current discharge lamp |
Jan. 6, 1998 |
| 5703439 |
Lamp power supply circuit with electronic feedback circuit for switch control |
Dec. 30, 1997 |
| 5701059 |
Elimination of striations in fluorescent lamps driven by high-frequency ballasts |
Dec. 23, 1997 |
| 5694006 |
Single switch ballast with integrated power factor correction |
Dec. 2, 1997 |
| 5691606 |
Ballast circuit for fluorescent lamp |
Nov. 25, 1997 |
| 5668444 |
Soft-transition FSK dimmer for gaseous luminous tube lights |
Sep. 16, 1997 |
| 5654611 |
Lamp control circuit having a V-I converter with slopes of different magnitudes and a second resistor connected in series with a first such that the second senses the output current of the V-I |
Aug. 5, 1997 |
| 5652479 |
Lamp out detection for miniature cold cathode fluorescent lamp system |
Jul. 29, 1997 |
| 5652480 |
Electronic ballast incorporating a clocked switching controller |
Jul. 29, 1997 |
| 5640069 |
Modular lighting system |
Jun. 17, 1997 |
| 5627434 |
Apparatus for operating a fluorescent lamp of an image forming apparatus |
May. 6, 1997 |
| 5621278 |
Ignition apparatus |
Apr. 15, 1997 |
| 5621279 |
Power-factor-corrected electronic ballast circuit |
Apr. 15, 1997 |
| 5608292 |
Single transistor ballast with filament preheating |
Mar. 4, 1997 |
| 5608293 |
Lamp circuit arrangement for controlling current flow through switching element |
Mar. 4, 1997 |
| 5608295 |
Cost effective high performance circuit for driving a gas discharge lamp load |
Mar. 4, 1997 |
| 5604409 |
Electronic lighting controller |
Feb. 18, 1997 |
| 5589742 |
Discharging lamp lighting apparatus having optimal lighting control |
Dec. 31, 1996 |
| 5578907 |
Power supply circuit |
Nov. 26, 1996 |
| 5576601 |
Drive circuit for electroluminescent panels and the like |
Nov. 19, 1996 |
| 5574337 |
Single touch flash charger control |
Nov. 12, 1996 |
| 5568017 |
Power supply system for discharge lamps, and a vehicle headlamp using such a power supply system |
Oct. 22, 1996 |
| 5565739 |
Power supply with the main inventive concept of periodically drawing power from a DC source |
Oct. 15, 1996 |
| 5561349 |
Frequency-modulated converter with a series-parallel resonance |
Oct. 1, 1996 |
| 5559395 |
Electronic ballast with interface circuitry for phase angle dimming control |
Sep. 24, 1996 |
| 5559405 |
Parallel resonant ballast with boost |
Sep. 24, 1996 |
| 5550437 |
Electronic dimmable gas tube power supply with overvoltage protection |
Aug. 27, 1996 |
| 5550436 |
MOS gate driver integrated circuit for ballast circuits |
Aug. 27, 1996 |
| 5550438 |
Circuit arrangement |
Aug. 27, 1996 |
| 5534754 |
Apparatus for supplying electrical power to an arc lamp including resonant circuit |
Jul. 9, 1996 |
| 5523654 |
Flashtube trigger circuit with anode voltage boost feature |
Jun. 4, 1996 |
| 5517089 |
Regulated electroluminescent panel power supply |
May. 14, 1996 |
| 5510680 |
Electronic ballast with special voltage waveforms |
Apr. 23, 1996 |
| 5510681 |
Operating circuit for gas discharge lamps |
Apr. 23, 1996 |
| 5502423 |
Discharge lamp lighting device |
Mar. 26, 1996 |
| 5498936 |
Power system with simplified, low cost self-starting self oscillator, power factor correction, power regulation and output open circuit voltage regulation, overload and short circuit protectio |
Mar. 12, 1996 |
| 5495149 |
Power supply |
Feb. 27, 1996 |
| 5479074 |
Electronic ballast with pre-conditioner circuit |
Dec. 26, 1995 |
| 5477112 |
Ballasting network with integral trap |
Dec. 19, 1995 |
| 5475285 |
Lamp circuit limited to a booster in which the power output decreases with increasing frequency |
Dec. 12, 1995 |
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