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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 |
| 7615934 |
High efficiency resonant ballast |
Nov. 10, 2009 |
| 7592753 |
Inductively-powered gas discharge lamp circuit |
Sep. 22, 2009 |
| 7589476 |
Power supply for external electrode fluorescent lamps |
Sep. 15, 2009 |
| 7580271 |
Apparatus and method for suppressing the input current inrush for a voltage converter in a pre-charge stage |
Aug. 25, 2009 |
| 7564191 |
Inverter having single switching device |
Jul. 21, 2009 |
| 7545103 |
Cold-cathode tube lighting device for use in a plurality of cold-cathode tubes lit by one low-impedance power source |
Jun. 9, 2009 |
| 7541745 |
Fluorescent lamp assembly having multiple settings and method |
Jun. 2, 2009 |
| 7525293 |
Power supply switching circuit for a halogen lamp |
Apr. 28, 2009 |
| 7521873 |
Circuit designs and control techniques for high frequency electronic ballasts for high intensity discharge lamps |
Apr. 21, 2009 |
| 7521877 |
Dimmer circuit for a discharge lighting apparatus |
Apr. 21, 2009 |
| 7518317 |
Backlight driving and control circuit with an isolated power factor correction structure |
Apr. 14, 2009 |
| 7508142 |
Ballast control circuit for use with CCFL and EEFL lamps |
Mar. 24, 2009 |
| 7489087 |
Backlight inverter and method of driving same |
Feb. 10, 2009 |
| 7480162 |
High efficiency two stage inverter |
Jan. 20, 2009 |
| 7459864 |
Power control methods and apparatus |
Dec. 2, 2008 |
| 7456581 |
Power supply, backlight apparatus, and display device |
Nov. 25, 2008 |
| 7441921 |
Backlight unit and method of driving the same |
Oct. 28, 2008 |
| 7443106 |
Circuit with switch-off device for the operation of light sources |
Oct. 28, 2008 |
| 7436123 |
Discharge lamp ballast device and lighting appliance |
Oct. 14, 2008 |
| 7436126 |
Resonant ballast circuit |
Oct. 14, 2008 |
| 7417381 |
Discharge lamp lighting circuit |
Aug. 26, 2008 |
| 7408356 |
Method of determining a zero point of a current sensor |
Aug. 5, 2008 |
| 7394208 |
Simplified electronic ballast circuit and method of operation |
Jul. 1, 2008 |
| 7391163 |
Apparatus of driving light source for display device |
Jun. 24, 2008 |
| 7388335 |
Apparatus for providing a sinusoidally amplitude-modulated operating voltage, lighting system and method for generating an amplitude-modulated voltage |
Jun. 17, 2008 |
| 7388336 |
Discharge lamp driving circuit having a signal detection circuit therein |
Jun. 17, 2008 |
| 7385360 |
High intensity discharge lamp control |
Jun. 10, 2008 |
| 7378802 |
Discharge lamp lighting circuit |
May. 27, 2008 |
| 7378805 |
Single-stage digital power converter for driving LEDs |
May. 27, 2008 |
| 7375471 |
Charging circuit |
May. 20, 2008 |
| 7372212 |
Lamp, method of driving the lamp, backlight assembly and liquid crystal display device having the backlight assembly |
May. 13, 2008 |
| 7368879 |
Pendulum resonant converter and method |
May. 6, 2008 |
| 7365498 |
Electrodeless discharge lamp lighting device and luminaire |
Apr. 29, 2008 |
| 7348733 |
Discharge lamp lighting circuit and method |
Mar. 25, 2008 |
| 7339323 |
Serial powering of an LED string |
Mar. 4, 2008 |
| 7332868 |
Discharge lamp lighting device |
Feb. 19, 2008 |
| 7332873 |
Electrical circuit for fluorescent lamps |
Feb. 19, 2008 |
| 7330180 |
Circuit and method for driving a capacitive load, and display device provided with a circuit for driving a capacitive load |
Feb. 12, 2008 |
| 7327093 |
External electrode fluorescent lamp, backlight unit using the external electrode fluorescent lamp, LCD backlight equipment using the backlight unit and driving device thereof |
Feb. 5, 2008 |
| 7323829 |
Minimizing bond wire power losses in integrated circuit full bridge CCFL drivers |
Jan. 29, 2008 |
| 7323823 |
Fluorescent lamp assembly having multiple settings and method |
Jan. 29, 2008 |
| 7323826 |
Anti-cycling control system for luminaires |
Jan. 29, 2008 |
| 7321200 |
Square wave drive system |
Jan. 22, 2008 |
| 7313006 |
Shoot-through prevention circuit for passive level-shifter |
Dec. 25, 2007 |
| 7300192 |
Methods and apparatus for illuminating environments |
Nov. 27, 2007 |
| 7294972 |
Feedback circuit for push-pull inverters |
Nov. 13, 2007 |
| 7285919 |
Electronic ballast having improved power factor and total harmonic distortion |
Oct. 23, 2007 |
| 7279848 |
Electronic ballast for a lamp |
Oct. 9, 2007 |
| 7274152 |
Rare gas fluorescent lamp lighting apparatus |
Sep. 25, 2007 |
| 7265499 |
Current-mode direct-drive inverter |
Sep. 4, 2007 |
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