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| Number | Title | Issue Date |
| 8174200 | Piezoelectric transformer driving device, cold-cathode tube inverter, cold-cathode tube driving device, and image forming apparatus A piezoelectric transformer driving device including: an oscillator; a frequency-divider outputting a pulse by dividing a clock signal from the oscillator by a frequency-divide ratio received thereto; a switching element driven by the pulse and intermittently applyi... | 05/08/2012 |
| 8164268 | Lighting device implemented through utilizing insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs) A lighting device implemented through utilizing an insulating type piezoelectric transformer in driving light-emitting-diodes (LEDs), comprising at least said insulating type piezoelectric transformer connected to an LED module, a primary side of said insulating typ... | 04/24/2012 |
| 7948187 | Electronically controlling acoustic energy from piezoelectric transformers A power-supply circuit is described. In particular, the power-supply circuit includes an input node configured to receive a power-supply signal, an output node configured to output a modulated power-supply signal, and a modulation mechanism coupled between the input... | 05/24/2011 |
| 7902763 | Piezoelectric cascade resonant lamp-ignition circuit The present invention discloses a piezoelectric cascade resonant lamp-ignition circuit, which uses the intrinsic capacitors of a piezoelectric transformer as piezoelectric capacitors. One lamp is cascaded to one set of the piezoelectric capacitors. Several sets of t... | 03/08/2011 |
| 7683554 | High-voltage lamp-ignition piezoelectric oscillator The present invention discloses a high-voltage lamp-ignition piezoelectric oscillator, wherein a piezoelectric capacitor is connected to an LC resonance circuit in parallel to transform power. The LC resonance circuit is used to generate resonance. Voltage is applie... | 03/23/2010 |
| 7372211 | Cold cathode tube lighting device and driving method and integrated circuit to be used in same A cold cathode tube lighting device is provided which is capable of obtaining stable luminance when a cold cathode tube is driven by applying voltages to input terminals on both ends of the cold cathode tube. A first current flowing through each of transformer secon... | 05/13/2008 |
| 7319297 | Balanced current lamp module and multi-lamp circuit A balanced current lamp module driven by a power source includes a first balanced current unit, a second balanced current unit and a balanced transformer. The first balanced current unit includes a first transformer, a first lamp and a second lamp. The first transfo... | 01/15/2008 |
| 7309964 | Floating drive circuit for cold cathode fluorescent lamp A floating driving device for illumination includes a illumination unit having a first terminal and a second terminal. A first driver is electrically coupled to the first terminal of the illumination unit, for applying AC voltages to the first terminal. A second dri... | 12/18/2007 |
| 7304441 | Method and apparatus for driving discharge lamps in a floating configuration A technique is described that facilitates sensing current through a load. A method according to the technique includes mounting a discharge lamp in a floating point configuration, sensing current through the discharge lamp, and controlling current through the discha... | 12/04/2007 |
| 7282866 | Discharge lamp lighting apparatus The present invention provides a discharge lamp lighting apparatus for lighting a discharge lamp having two electrodes, having: a first drive circuit, a second drive circuit, and a control circuit. The first drive circuit is connectable to one of the two electrodes ... | 10/16/2007 |
| 7279822 | Transformer level driving circuit A transformer level driving circuit mainly aims to drive a medium voltage system. It includes a control unit to generate a resonant frequency and output phase signal waveforms, and a medium voltage driving circuit which includes a floating level unit and a driving u... | 10/09/2007 |
| 7274172 | Drive state detection circuit A drive state detection circuit is disclosed that detects a drive state of plural parts driven by alternating currents. The drive state detection circuit comprises current detecting parts to detect alternating current detection signals of the respective alternating ... | 09/25/2007 |
| 7253565 | Apparatus for supplying power, backlight assembly and liquid crystal display apparatus having the same Disclosed are a power supplying apparatus, a backlight assembly and an LCD apparatus having the same. A control section outputs a switching signal so as to control an output of a constant current supplied to a lamp unit in response to on and/or off signals and a dim... | 08/07/2007 |
| 7233117 | Inverter controller with feed-forward compensation The present invention is an inverter controller with feed-forward compensation. The inverter controller includes an error amplifier, a high frequency oscillator (HFOSC) with feed-forward compensation, a comparator, and a driver. The error amplifier can output a sign... | 06/19/2007 |
| 7227316 | Protective and measure device for multiple cold cathode fluorescent lamps A protective and measure device for multiple cold cathode fluorescent lamps includes an electronic ballast functioning as a high-frequency power source for driving multiple cold cathode fluorescent lamps (CCFLs), primarily by parallel connecting one end of each of a... | 06/05/2007 |
| 7202592 | Piezoelectric transformer, power supply circuit and lighting unit using the same A piezoelectric transformer includes a piezoelectric ceramic disc having one face and the other face opposite to each other in a thickness direction. A pair of low-impedance portions acting as one of a driving portion and a generator portion are disposed in the piez... | 04/10/2007 |
| 7200017 | Controller and driving method for supplying energy to display device circuitry A controller for controlling at least two power circuits comprises a phase-shift selector for generating a reference signal according to variable input signals, the reference signal is programmed to indicate an amount of phase-delay according to a number of CCFL pow... | 04/03/2007 |
| 7196476 | Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Apparatus and methods for measuring cathode fall in fluorescent lamps are disclosed. Together with measurements of cathode temperature, such measurements of cathode fall may inform a determination of cathode heater voltage as a function of discharge current (i.e., a... | 03/27/2007 |
| 7196475 | Image forming apparatus utilizing a piezoelectric-transformer high-voltage power supply and method for controlling the same A piezoelectric-transformer high-voltage power supply in combination with an image-forming apparatus including a latent-image forming section configured to form an electrostatic latent image on an image carrier, a developing section configured to form a toner image ... | 03/27/2007 |
| 7183726 | Cold cathode fluorescent lamp drive apparatus and method A cold cathode fluorescent lamp drive apparatus for lighting a cold cathode fluorescent lamp is disclosed. The cold cathode fluorescent lamp drive apparatus includes an abnormal current holding unit that is configured to hold an abnormal current that flows in the co... | 02/27/2007 |
| 7166969 | Drive circuit for illumination unit In case of driving a plurality of lamps with the use of a plurality of output transformers, a difference in the bright-ness of each lamp occurs by a dispersion of characteristics of the output transformers, and an object is to prevent such troubles. For this purpose... | 01/23/2007 |
| 7161276 | Self-powered, electronic keyed, multifunction switching system A self-powered switching system using electromechanical generators generates power for activation of a latching relay, switch, solenoid or latch pin. The electromechanical generators comprise electroactive elements that may be mechanically actuated to generate elect... | 01/09/2007 |
| 7157861 | Push-pull inverter circuit The present invention discloses a push-pull inverter circuit comprising a transformer with a power output end coupled to a load and two power input ends, and a power driver unit is connected between the two power output ends and a power supply unit, and the power dr... | 01/02/2007 |
| 7151394 | Phase shifting and PWM driving circuits and methods The present invention provides an inverter controller comprising a drive circuit that generates a plurality of switch drive signals for inverter applications. In some exemplary embodiments, the drive circuit operates by reversing the command level of an error signal... | 12/19/2006 |
| 7106010 | Backlight module for reducing interference A backlight module for reducing interference includes: a plurality of radiating units, a plurality of transferring units, and a phase control unit. Each transferring unit is connected to a corresponding radiating unit and can provide a set of driving power sources t... | 09/12/2006 |
| 7091674 | Rare gas fluorescent lamp device A lighting apparatus comprising a branch circuit wherein a light receiving cycle signal branches into a synchronizing signal and a light controlling signal, a frequency recognizing circuit which wherein a lighting frequency is calculated from the light controlling s... | 08/15/2006 |
| 7049760 | Camera flash circuit using a piezoelectric transformer to trigger firing of the camera flash tube A camera flash circuit employing a piezoelectric transformer in the flash trigger circuit, the piezoelectric transformer having input terminals coupled to the main flash voltage storage capacitor and an output terminal coupled to the flash trigger terminal on the fl... | 05/23/2006 |
| 7042135 | Current detection circuit and current detection method A current detection circuit which applies an AC voltage to a vibrator (1) which converts electricity into a mechanical energy to vibrate, and detects a mechanical branch current serving as a current component which contributes to the vibration of the vibrator... | 05/09/2006 |
| 7038354 | Driving circuit for piezoelectric transformer, cold-cathode tube light-emitting apparatus, liquid crystal panel and device with built-in liquid crystal panel A driving circuit for a piezoelectric transformer is provided, which ensures lighting of all the cold-cathode tubes connected to the piezoelectric transformer, and reduces the difference in brightness between the cathode tubes during steady lighting, thereby enhanci... | 05/02/2006 |
| 7038644 | Apparatus for applying OFF-state stress to P-MOS device An apparatus for applying an OFF-state stress to a P-MOS device of one of an array substrate for an LCD device and an LCD panel having attached substrates includes: a power supply unit supplies a source power; a panel loading unit including a plurality of panel jigs... | 05/02/2006 |
| 7034800 | Driving circuit and driving method for piezoelectric transformer, backlight apparatus, liquid crystal display apparatus, liquid crystal monitor, and liquid crystal TV A driving circuit for a piezoelectric transformer is provided, which is capable of driving a piezoelectric transformer at a high efficiency and with low distortion, and being miniaturized. At the commencement of lighting a cold-cathode fluorescent tube, a digital co... | 04/25/2006 |
| 7030538 | Piezoelectric transformer, piezoelectric transformer unit, inverter circuit, light emission control device, and liquid crystal display device A low loss, small scale piezoelectric transformer, suited for a cold cathode tube load, and having a high effective coupling factor, is provided using a piezoelectric plate having a single polarization direction. Controlling the dimensions of the third electrode por... | 04/18/2006 |
| 7023142 | Light modulation method and apparatus for cold cathode fluorescent lamps A method and apparatus for modulating light of CCFLs that couples frequency alteration and pulse width modulation (PWM) approaches to change output voltage and current of a piezoelectric transformer to modulate the luminosity of a CCFL. The invention includes a PWM ... | 04/04/2006 |
| 6989626 | Piezoelectric transformer A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes. ... | 01/24/2006 |
| 6969956 | Current control apparatus for fluorescent lamps A current control apparatus for fluorescent lamps adopted for use on high voltage actuated a fluorescent lamp includes a high frequency pulse modulator to provide voltage distribution signals, a power switch which is a MOSFET to output actuation signals, a conversio... | 11/29/2005 |
| 6958582 | Lamp current control circuit The present invention is a lamp current control circuit applied to a high voltage outputting combination for providing uniformity of lamp current of at least one load. Voltage dividing units of the lamp current control circuit receive high power signals output by th... | 10/25/2005 |
| 6949890 | LCD back light panel lamp connecting structure An improved LCD back light panel lamp connecting structure comprises at least one set of cold cathode fluorescent lamps (CCFL), each having its high voltage end and feedback end arranged alternately, and the feedback ends on both sides of the CCFL respectively coupl... | 09/27/2005 |
| 6946806 | Method and apparatus for controlling minimum brightness of a fluorescent lamp An efficient power conversion circuit for driving a fluorescent lamp uses a minimum pulse generator circuit to control the minimum on-time of a time modulated signal to increase the dimming range of the fluorescent lamp operating over a wide range of temperature and... | 09/20/2005 |
| 6914365 | Piezoelectric transformation driving apparatus A piezoelectric transformation driving apparatus to drive a plurality of high voltage systems through a low voltage system includes a control unit and a driving unit to output first driving signals of the same phase and same frequency to drive a transformation unit,... | 07/05/2005 |
| 6914392 | Switching apparatus for operating discharge lamps The following circuit is proposed for discharge lamps having a particularly high starting voltage. An a.c. voltage generator (1) provides a corresponding a.c. voltage. A starting voltage generating device, which comprises a piezo transformer (2), is co... | 07/05/2005 |
