Patent application number | Description | Published |
20150097542 | Asymmetric Inductors in Multi-Phase DCDC Converters - A multi-phase DC-to-DC converter is configured to achieve fast transient response and to optimize efficiency over the load range. Phase shedding changes the active number of phases according to output currents. Each phase of the converter has an inductor configured to optimize the efficiency for a range of load currents in which that phase is used. A converter may have 3 phases, the first used only in sleep mode and has a large inductance with low AC losses, the second used in sync mode at low currents and having a lower inductance with low AC losses, the third phase is used in sync mode at high currents and has small inductance with low DC losses. The number of phases is ≧2. | 04-09-2015 |
20150301091 | Duty Cycle Independent Comparator - Disclosed are methods and circuits to measure independently of duty cycles a pulsed current of a pass transistor of a switched circuit. Methods and circuits of one embodiment may be applied to precisely operate DC-to-DC converters such as buck converters in the most efficient operation modes. Another embodiment can be used to measure the pulsed current independently of duty cycle over a wide range of current values. | 10-22-2015 |
20150301551 | Multiple Output Offset Comparator - A multiple output comparator compares a first input signal and a second input signal. An output mirror circuit receives the comparison and sets an output signal at a first output terminal of the multiple output comparator to a digital state indicating that the magnitude of the first signal is greater than or lesser than the second signal. An offset generator creates an offset signal for adjusting a threshold signal level at the output mirror circuit such that the difference of the first signal and the second signal is combined with the offset signal. The output mirror circuit transfers provides a digital state to another output terminal indicating that the first signal is greater than or lesser than the second signal as adjusted by the adjustment signal. | 10-22-2015 |
20150303800 | Negative Current Clocking - A switching mode power supply (SMPS) is capable of clearing an overvoltage condition. The overvoltage is determined by detecting that the output voltage has exceeded the input voltage by a limited amount. The overvoltage is cleared by repetitively turning on and then off the switches controlling the flow of energy to the SMPS in sequence until the excess charge resulting from the overvoltage is couple to circuit ground, and the output is reduced to within acceptable limits. | 10-22-2015 |
20150303801 | Buck Variable Negative Current - An active diode formed within a buck power regulator with an NMOS transistor is connected to a PMOS transistor at a node that is further connected to the regulator output through an inductor. The active diode combines the NMOS transistor with circuitry to prevent conduction once the active diode passes a threshold voltage. Additional circuitry compares the output voltage to the target input voltage and varies the threshold voltage of the active diode such that the active diode can discharge excess current from the regulator each cycle until the output voltage is less than the target voltage. | 10-22-2015 |
20150303802 | Drive Scheme for Weakly Coupled Coils - A variable efficiency and response buck converter is achieved. The device includes a multi-phase switch, the coupled coils, the filter capacitor, and the load. The multi-phase switch includes the phase control inputs, the circuit common reference, at least two pairs of complementary switches with each switch containing one upper switch and one lower switch, at least two phase control outputs from the complementary switches. The coupled inductive coils are coupled to the phase control outputs to enable weak couplings and strong couplings. Based on the working mode, equivalently the coupled coils can provide strong mutual inductances and weak mutual inductances. The filter capacitors connected to the output of the coupled coils provide high efficiency output to the load. | 10-22-2015 |
20160105108 | Method and Apparatus for a Buck Converter with Pulse Width Modulation and Pulse Frequency Modulation Mode - A buck converter device with minimum off-time operation, the device comprising a comparator providing an output signal of a minimum off time, a first amplifier, a p-channel MOSFET whose gate is connected to the output of a first amplifier providing a signal threshold voltage to a positive terminal of a comparator, a second amplifier; and, a second p-channel MOSFET whose gate is connected to the output of a second amplifier providing a signal to a negative terminal of a comparator, and a capacitor element. A capacitor establishes a voltage whose rate of change is proportional to power supply Vdd, establishing a time to charge the capacitor to a threshold voltage proportional to (Vdd-Vref)/Vdd, and establishing a minimum off time on the output of a comparator. | 04-14-2016 |
20160111956 | Clocked Pulse Frequency Modulation Buck DC-to-DC Converter - A hysteretic mode control circuit within a DC-to-DC converter is configured for varying the current limit that controls the switching interval and duration of a power switching section of the DC-to-DC converter to permit the DC-to-DC converter to manage large changes in output current load of the DC-to-DC converter. The hysteretic mode control circuit has a positive and a negative current limit section that develop a first and a second reference signal for turning on and turning off the first and the second switching device. The first and second reference signals are compared to an output voltage of the power switching section to determine if the first switching device or the second switching device is to be turned on or turned off. | 04-21-2016 |
Patent application number | Description | Published |
20080203930 | Electroluminescent Display Devices - An active matrix display device comprises an array of display pixels provided over a common substrate. Each pixel has a voltage-programmed current source circuit, a drive transistor and a light sensitive device for sensing the display element light output. The light sensitive device provides a current dependent on the display element output, and the light sensitive device and the current source circuit define a feedback control loop which controls the voltage provided to the gate of the drive transistor. This pixel circuit uses a current source circuit to provide a gate voltage to a drive transistor. This enables the current source circuit to operate at low current levels, and therefore under low voltage stress. | 08-28-2008 |
20080212000 | Colour Active Matrix Displays - A method of manufacturing a colour active matrix display device comprises forming islands over a rigid carrier substrate, forming a plastic substrate over the rigid carrier substrate, forming an array of pixel circuits over the plastic substrate and forming a display layer over the array of pixel circuits. The rigid carrier substrate is then released from the plastic substrate and the plastic substrate then has channels defined by the islands. These are filled to define colour filter portions. The formation of a plastic substrate on a rigid carrier, with the use of a subsequent lift off process, enables the circuit arrays to be made on very thin plastic sheets. The colour filters can then be made on the outside of the LC cell. Depressions are formed in the plastic substrate registered to the circuit array, and these are filled in with colour filter material, for example by ink jet printing. | 09-04-2008 |
20100177075 | ELECTROLUMINESCENT DISPLAY DEVICES - An active matrix LED display device uses optical feedback for controlling the pixel drive transistors ( | 07-15-2010 |
20100265440 | COLOUR ACTIVE MATRIX DISPLAYS - A method of manufacturing a colour active matrix display device comprises forming islands over a rigid carrier substrate, forming a plastic substrate over the rigid carrier substrate, forming an array of pixel circuits over the plastic substrate and forming a display layer over the array of pixel circuits. The rigid carrier substrate is then released from the plastic substrate and the plastic substrate then has channels defined by the islands. These are filled to define colour filter portions. The formation of a plastic substrate on a rigid carrier, with the use of a subsequent lift off process, enables the circuit arrays to be made on very thin plastic sheets. The colour filters can then be made on the outside of the LC cell. Depressions are formed in the plastic substrate registered to the circuit array, and these are filled in with colour filter material, for example by ink jet printing. | 10-21-2010 |
Patent application number | Description | Published |
20120215506 | WAVEFORM INVERSION BY MULTIPLE SHOT-ENCODING FOR NON-FIXED SPREAD GEOMETRIES - Seismic data processing methods and computing systems are presented. In one embodiment, a method is disclosed that includes simulating a set of simulated seismic data from a set of acquired seismic data; separating the simulated seismic data into a plurality of data sets, wherein one set of data is matched in the acquired seismic data and one set of data is unmatched in the acquired seismic data; conforming the simulated seismic data and the acquired seismic data to one another using separated, simulated seismic data unmatched by a counterpart in the acquired seismic data from the acquired seismic data; and performing an inversion between the acquired seismic data and the separated, simulated seismic data after they are conformed to one another. | 08-23-2012 |
20130294196 | INVERSION USING A FILTERING OPERATOR - To perform inversion to produce a model of a structure, a filtering operator based at least on an angle between a propagating direction of a source wavefield and a propagating direction of a back-propagated receiver wavefield is computed. The filtering operator is used in performing the inversion to produce the model of the structure. | 11-07-2013 |
20130338922 | DETERMINING AN OUTPUT REPRESENTING A TARGET STRUCTURE BASED ON ENCODED SOURCE AND RECEIVER DATA - A source wavefield is computed from encoded source data calculated by performing encoding of source wavelets with noise. A receiver wavefield is computed from encoded receiver data calculated by encoding of measured receiver data with the noise. An output representing a target structure is determined based on the source wavefield and the receiver wavefield. | 12-19-2013 |
20150272506 | WAVE EQUATION PROCESSING - A volume of data is partitioned into a plurality of domains. A multilevel preconditioner is applied in the plurality of domains to provide iterative approximate solutions for the domains, which are coupled with boundary conditions. The approximate solutions for the domains are stitched together to provide a solution for a wave equation which can be used in full waveform inversion. | 10-01-2015 |