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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 |
| 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 |
| 7388336 |
Discharge lamp driving circuit having a signal detection circuit therein |
Jun. 17, 2008 |
| 7388335 |
Apparatus for providing a sinusoidally amplitude-modulated operating voltage, lighting system and method for generating an amplitude-modulated voltage |
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 |
| 7323826 |
Anti-cycling control system for luminaires |
Jan. 29, 2008 |
| 7323823 |
Fluorescent lamp assembly having multiple settings and method |
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 |
| 7253564 |
Lamp current balancing device |
Aug. 7, 2007 |
| 7247991 |
Dimming ballast and method |
Jul. 24, 2007 |
| 7245086 |
Lamp operating circuit and operating method for a lamp having active current measurement |
Jul. 17, 2007 |
| 7242153 |
Pulse width modulation inverter circuit and control method thereof |
Jul. 10, 2007 |
| 7239090 |
Discharge lamp lighting apparatus |
Jul. 3, 2007 |
| 7233114 |
Apparatus for driving lamp of liquid crystal display device |
Jun. 19, 2007 |
| 7233113 |
Power supply system for liquid crystal monitors |
Jun. 19, 2007 |
| 7230391 |
Multi-phase input dimming ballast with flyback converter and method therefor |
Jun. 12, 2007 |
| 7227315 |
Discharge lamp drive apparatus and liquid crystal display apparatus |
Jun. 5, 2007 |
| 7218059 |
Discharge-lamp control device |
May. 15, 2007 |
| 7218060 |
Flyback ballast for fluorescent lamp |
May. 15, 2007 |
| 7218541 |
High efficiency two stage inverter |
May. 15, 2007 |
| 7211965 |
High intensity discharge lamp with current sense resistor |
May. 1, 2007 |
| 7208884 |
Discharge lamp lighting circuit with an open protection circuit |
Apr. 24, 2007 |
| 7208886 |
Apparatus for driving cold cathode fluorescent lamps |
Apr. 24, 2007 |
| 7205725 |
Electronic stabilizer used for hand-held lamp |
Apr. 17, 2007 |
| 7199530 |
Digital ballast |
Apr. 3, 2007 |
| 7187135 |
High intensity discharge lamp electronics controller |
Mar. 6, 2007 |
| 7183722 |
Apparatus and method of driving lamp of liquid crystal display device |
Feb. 27, 2007 |
| 7176638 |
Discharge lamp lighting circuit |
Feb. 13, 2007 |
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