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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:

Class Number Class Name Patents
315/223 Condenser or inductance in the primary circuit 72
315/222 Plural interrupted transformer coil circuits 15
315/220 Plural transformers in the supply circuit 59
315/221 Secondary conductively connected to the primary 27


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13

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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