| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 315283000 | Inductance in the supply circuit | 15 |
| 20090267531 | Arrangement for Driving LED Cells - A driving arrangement for feeding a current generated by a high frequency generator ( | 10-29-2009 |
| 20100194305 | ELECTRONIC BALLAST FOR DISCHARGE LAMP - An electronic ballast for a discharge lamp includes a predictive circuit and a correction circuit in addition to a power conversion circuit including an inverter circuit and a resonant circuit, a drive circuit and a frequency control circuit. The inverter circuit applies load voltage across a load circuit including the lamp via the resonant circuit. The predictive circuit predicts a resonance frequency of the combination of the resonant circuit and the load circuit after ignition of the lamp. The resonance frequency is predicted based on an input signal representing the load voltage in the period of time from the start of sweep of the inverter circuit's operating frequency through a time point immediately after ignition of the lamp. The correction circuit changes the end frequency of the sweep to the resonance frequency. | 08-05-2010 |
| 20100277088 | SYSTEM FOR SUPPLYING CURRENT TO A LOAD - A system for supplying current to a load is disclosed. One embodiment provides a switching converter for providing a load current to the load. The switching regulator includes a switching circuit. A current control unit generates a modulated current control signal representing a desired load current. The switching circuit is driven dependent on the modulated current control signal. A logic circuit receives a pulse-width-modulated control signal representing a desired dimming ratio and is configured to generate a gate signal for driving the switching circuit dependent on the current control signal during a duty cycle of the pulse-width-modulated control signal. The logic circuit is configured to activate the switching converter, independent on the state of the current control signal, at the beginning of the duty cycle of the pulse-width-modulated control signal. | 11-04-2010 |
| 20110006700 | CHARGE PUMP ELECTRONIC BALLAST FOR USE WITH LOW INPUT VOLTAGE - A charge pump electronic ballast for use with low input voltage is described. The charge pump electronic ballast includes a DC/AC inverter circuit having two switching transistors, a resonant circuit having an inductor and a capacitor. The charge pump electronic ballast further includes a voltage multiplying rectifying circuit for transforming low input AC voltage into high output DC voltage, and a charge pump circuit having an inductor and a first pump capacitor. | 01-13-2011 |
| 20110133664 | Transition Mode Commutation For Inverter - A driver circuit includes a plurality of switches, forming two switching legs, each of at least two switches and connected between two DC voltage buses. The switches are matched to form diagonal pairs. The driver circuit also includes a load circuit connecting the legs, with a first inductor connected between one leg's switches, and a second inductor connected between the other leg's switches, and lamp terminals between the inductors and in series with the second inductor. The driver circuit also includes a capacitor in parallel with the series-connected lamp terminals and the second inductor, and a control circuit connected to the plurality of switches. During a commutation period, a diagonal pair operates in a non-conductive state and the other in a conductive state, until a current through the first inductor reaches a predefined value. Then the other operates in a non-conductive state until the current through the first inductor reaches zero. | 06-09-2011 |
| 20120001565 | IGNITION CONTROL APPARATUS USED IN ELECTRONIC BALLAST AND METHOD THEREOF - The present invention is generally related to an electronic ballast, an ignition control apparatus used therein and associated method of operation. In one embodiment, an electronic ballast comprising an inverter and an ignition control apparatus which comprises a stability monitoring circuit and a controlled ignition circuit. The inverter converts a DC input voltage into an AC voltage to drive a gas discharge lamp. The stability monitoring circuit monitors whether the DC input voltage is stable. The controlled ignition circuit is electrically coupled to the stability monitoring circuit and the lamp, ignites the lamp based on the monitoring result. The controlled ignition circuit does not ignite the gas discharge lamp until the DC input voltage becomes stable. | 01-05-2012 |
| 20120242246 | LIGHTING DEVICE AND ILLUMINATION APPARATUS - A lighting device includes: a series circuit of an inductor and a switching element; a diode which regenerates and supplies an energy of the inductor; and a control circuit which controls on/off of the switching element. The control circuit includes a drive signal generator which outputs a high frequency pulse drive signal; and a drive control section which turns on and off the switching element based on the high frequency drive signal and a PWM signal. The drive signal generator changes an ON time of the high frequency drive signal such that, after the PWM signal is changed from OFF to ON, a peak value of the load current gradually drops along an envelope of a specific slope, and the specific slope of the envelope is changed based on a duty ratio of the PWM signal. | 09-27-2012 |
| 20120286693 | Circuit Assembly and Method for Operating a Discharge Lamp - A circuit assembly for operating a discharge lamp ( | 11-15-2012 |
| 20120326621 | Power Efficient Driving Circuits of Light Source for Projectors - A system for driving current to the light source may include a first inductor to supply current to the light source, a power source to supply current to the inductor, a first switch SET to supply current to the inductor without supplying the current to the light source and a second switch SET to supply the current from the inductor to the light source. Also a system for driving current to light source may include two inductors or a transformer, to supply current to the light source by connecting the first inductor to the light source by a switch set, while the second inductor may be connected to the voltage source by another switch set. And this role can be exchanged between the two inductor alternately and in sequence, defined by time periods. | 12-27-2012 |
| 20130127367 | LIGHTING DEVICE AND ILLUMINATION APPARATUS - A lighting device includes: a DC converter including at least an inductor, a switching unit and a diode and being configured to output an energy accumulated in the inductor to a load via the diode by using an input from a DC power source when the switching unit is turned off; a load voltage detection unit connected to the load to detect a load voltage of the load; and an abnormality determining unit configured to determine an abnormality when the load voltage is equal to or less than a preset threshold voltage. The device further includes an output control unit configured to drive the switching unit so that oscillation of the switching unit is stopped or the output of the DC converter is decreased when the abnormality is determined. | 05-23-2013 |
| 20140084807 | DIGITALLY CONTROLLED CURRENT REGULATOR FOR HIGH POWER SOLID STATE LIGHTING - A representative apparatus controls current supplied to solid state lighting, such as light emitting diodes. The apparatus includes an inductor, a memory adapted to store a plurality of current parameters and a controller. The controller is configured to control a power source to supply current to the inductor to start an energizing cycle, monitor an inductor current level, reduce the inductor current level in response to the inductor current level reaching a predetermined peak inductor current, and increase the inductor current level in response to the inductor current reaching a predetermined minimum current is reached. In at least one embodiment, the controller modulates a current provided to the solid state lighting such that a DC average current level is substantially proportional to one-half of a sum of the predetermined peak current level and the predetermined minimum current level. | 03-27-2014 |
| 20140111111 | GAS DISCHARGE LAMP BALLAST WITH RECONFIGURABLE FILAMENT VOLTAGE - An amount of filament voltage supplied by a reconfigurable ballast may be adjusted based on a lamp type with which the ballast is operating. The filament voltage may be reconfigured dynamically and/or may be reconfigured via a user-provided value. An electronic dimming ballast may include a control circuit configured to control generation of the AC filament voltage in accordance with a reconfigurable AC filament voltage value. Reconfiguring an electronic dimming ballast may include reconfiguring an AC filament voltage applied by the electronic dimming ballast to a filament of a lamp installed in the electronic dimming ballast. Reconfiguring the AC filament voltage may include computing a hot-to-cold cathode resistance ratio associated with the filament. Reconfiguring the AC filament voltage may include determining whether the computed hot-to-cold cathode resistance ratio is within a range specified for the electronic dimming ballast. | 04-24-2014 |
| 20140152192 | POWER SUPPLY APPARATUS FOR LED LIGHTING AND LED LIGHTING APPARATUS USING THE POWER SUPPLY APPARATUS - Disclosed are a power supply apparatus for an LED lighting and an LED lighting apparatus using the power supply apparatus. The LED lighting apparatus includes a power source unit configured to supply a rectified voltage, a voltage converter configured to include at least one first inductor and to convert the rectified voltage, an auxiliary coil configured to include a second inductor and to supply a detection voltage corresponding to the current of the first inductor of the voltage converter, a controller configured to control the current of the voltage converter using a driving pulse generated in response to a control signal and a sensing voltage, and a voltage regulation circuit configured to regulate the detection voltage and to supply the regulated voltage as an operating voltage for the controller. | 06-05-2014 |
| 20160102647 | IGNITION DEVICE OF SPARK-IGNITION INTERNAL COMBUSTION ENGINE - In an ignition device of a spark-ignition internal combustion engine that performs ignition with high energy efficiency while reducing power to be input to a spark plug, after a DC-voltage-pulse generation circuit that generates a DC voltage pulse between electrodes of a spark plug is operated by a control circuit, an AC-pulse generation circuit that generates an AC pulse between the electrodes of the spark plug is operated. Furthermore, the control circuit controls the AC-pulse generation circuit with a plurality of group pulses and quiescent periods between the group pulses are provided. | 04-14-2016 |
| 315284000 | Variable inductance | 1 |
| 20080203938 | Block Dimming for Hid Lamps - To dim a high intensity gas discharge (HID) lamp an inductance is connected in series with said HID lamp. The inductance functions as a ballast. The HID lamp is supplied by a frequency adjustable AC voltage supply. Since the impedance of the inductance is dependent on the frequency of the supply voltage, the current through the inductance is dependent on said frequency. Thus, the lamp current may be controlled by changing the frequency of the supply voltage, while the voltage is kept high kept high to prevent the lamp from extinguishing. The method and circuit of the present invention are suitable for driving a number of HID lamps simultaneously. Further, the HID lamp may be dimmed to about 20% of its nominal power, depending on the type of HID lamp. Dimming may be performed substantially instantly without extinction of the lamp. | 08-28-2008 |
