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| 20100246216 | SWITCH MODE POWER SUPPLY CONTROLLERS - This invention relates to SMPS controllers employing primary side sensing. We describe a system for identifying a knee point in a sensing waveform, at which the output voltage of the SMPS may be sampled accurately on the primary side. The system identifies the knee point, broadly speaking, by tracking a portion of a power transformer voltage waveform, and samples the voltage waveform at the knee point to determine the SMPS output voltage. In preferred embodiments this technique is implemented using a circuit akin to a decaying peak detector, providing a timing signal indicating detection of the knee point. Sample/hold and error amplifier circuits may be employed to achieve output voltage regulation. | 09-30-2010 |
| 20130094248 | Regulating Controller for Controlled Self-Oscillating Converters Using Bipolar Junction Transistors - A power converter controller and methods for its operation are provided that can control a self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller estimates the output power of the converter without requiring a connection to the secondary side of the converter transformer. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed. | 04-18-2013 |
| 20130294112 | Regulating Controller for Controlled Self-Oscillating Converters Using Bipolar Junction Transistors - A power converter controller and methods for its operation are provided that can control a self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller estimates the output power of the converter without requiring a connection to the secondary side of the converter transformer. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed. | 11-07-2013 |
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| 20100039833 | POWER SUPPLY CONTROL SYSTEM - This invention relates to improved control systems and methods for switch mode power supplies. A control system for a switch mode power supply (SMPS), the SMPS having a input side for receiving a power supply input and an output side for providing a dc output voltage, said input and output side of said SMPS being coupled by a transformer, the control system having two operating modes, a first mode for regulating an output voltage of the power supply responsive to a feedback signal derived from a dc voltage on said power supply output side dependent upon said output voltage, and a second mode for regulating an output voltage of the power supply responsive to a feedback signal derived from an auxiliary winding of said transformer, said control system having a feedback input to receive a said feedback signal, a control output for regulating said output voltage, and a mode selector coupled to said feedback input to select one of said first and second control system operating modes responsive to said feedback signal. | 02-18-2010 |
| 20100046258 | POWER SUPPLY CONTROL SYSTEM - A digital control system for a switch mode power supply (SMPS), the control system having a demand input for a signal indicating whether an output voltage of said SMPS is above or below a desired value, and a drive output for a switch controlling energy transfer between an input and an output of said SMPS during a power switching cycle, the control system further including: a signal processor coupled to said demand input and to said drive output to control said drive output responsive to said demand signal to regulate said output voltage at said desired value, and wherein said signal processor includes at least one storage element to store at least one value of said demand signal, and wherein said switching control signal for a said power switching cycle is responsive to a value of said demand signal in at least two previous power switching cycles. | 02-25-2010 |
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| 20110114824 | APPARATUS AND METHOD FOR PREVENTING CHARGE PUMPING IN SERIES CONNECTED DIODE STACKS - An ambient light sensor includes a first stack of at least two photodiodes, wherein a cathode of one of the at least two photodiodes is electrically connected to an anode of another of the at least two photodiodes. The ALS further includes a bias source for providing a bias voltage to the first stack, and at least one switch electrically connected to the first stack. The at least one switch is operative to periodically apply the bias voltage to and remove the bias voltage from the first diode stack. | 05-19-2011 |
| 20120038597 | PRE-PROGRAMMING OF IN-PIXEL NON-VOLATILE MEMORY - A display device includes a liquid crystal display having a plurality of pixels, each pixel having a corresponding pixel electrode. Each pixel also includes a volatile memory (VM) cell and a non-volatile memory (NVM) cell. The VM cell includes a VM cell input for receiving data to be stored in the VM cell and a VM cell output for outputting data stored in the VM cell. The NVM cell includes an NVM program input operatively coupled to the VM cell output, and an NVM data output for providing data stored in the first NVM cell to the pixel electrode. The display device also includes programming logic operatively coupled to each of the plurality of pixels, wherein the programming logic is configured to substantially simultaneously program each pixel's first NVM cell with data provided by each pixel's VM cell. | 02-16-2012 |
| 20130033450 | DUAL MODE CAPACITIVE TOUCH PANEL - A dual mode capacitive touch panel includes a sensor substrate, an electrode layer comprising an array of sensor electrodes arranged over the sensor substrate, the array of sensor electrodes including a plurality of drive electrodes and a plurality of sense electrodes, each sensor electrode corresponding to a location on the sensor substrate, and a shield layer arranged over and spaced apart from the electrode layer. The shield layer includes a predetermined resistance that permits transmission of an electric field at a first frequency and prevents transmission of an electric field at a second frequency, wherein a spacing between the shield layer and the electrode layer is deformable as a result of a force applied to the shield layer due to a user touch, wherein the deformation alters a capacitance between the shield layer and a sensor electrode of the array. A controller is operatively coupled to the array of sensor electrodes, the controller configured to drive the shield layer and at least some sensor electrodes of the sensor electrode array at the first frequency in a first mode to measure a location of an object relative to the sensor substrate, and drive the shield and the at least some sensor electrodes at a second frequency in a second mode different from the first mode to measure a force applied toward the sensor substrate. | 02-07-2013 |
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| 20100060562 | STRAY LIGHT COMPENSATION IN AMBIENT LIGHT SENSOR - A method is provided of compensating for stray light in a light sensor having a detection photosensor ( | 03-11-2010 |
| 20110006311 | PHOTOSENSITIVE STRUCTURE AND APPARATUS INCLUDING SUCH A STRUCTURE - A photosensitive structure comprises a plurality of photosenstivie regions ( | 01-13-2011 |
| 20110268151 | ARRAY ELEMENT FOR TEMPERATURE SENSOR ARRAY CIRCUIT, TEMPERATURE SENSOR ARRAY CIRCUIT UTILIZING SUCH ARRAY ELEMENT, AND AM-EWOD DEVICE INCLUDING SUCH A TEMPERATURE SENSOR ARRAY CIRCUIT - An array element for a temperature sensor array circuit. The array element includes a switch transistor; and a temperature sensor element having an impedance which varies as a function of temperature, the temperature sensor element being connected in parallel with a source and drain of the switch transistor | 11-03-2011 |
| 20140009428 | CAPACITIVE TOUCH PANEL WITH HEIGHT DETERMINATION FUNCTION - A capacitive touch sensor includes a sensor substrate and an array of electrode elements formed over the sensor substrate. Each electrode element of the array includes at least one of a first electrode group comprising at least two drive electrodes and at least one sense electrode, or a second electrode group comprising at least two sense electrodes and at least one drive electrode. The respective electrodes of the first or second electrode group are arranged to form multiple capacitances over different coupling distances. A controller is operatively coupled to the array of electrode elements, the controller configured to determine a distance of an object relative to the surface of the touch sensor based on variations in the multiple capacitances. | 01-09-2014 |
| 20140062933 | CAPACITIVE TOUCH PANEL WITH A 'DUAL LAYER' FORCE SENSOR - A capacitive touch panel includes a first substrate and a second substrate arranged relative to the first substrate. A plurality of drive electrodes are arranged on the first substrate, wherein each drive electrode comprises a first drive electrode section and a second drive electrode section. In addition, a plurality of sense electrodes are arranged on the second substrate, the plurality of sense electrodes including touch sensing electrodes and force sensing electrodes. At least part of a sense electrode of the plurality of sense electrodes forms a force sensitive coupling capacitance with a second drive electrode section and not with a first drive electrode section. | 03-06-2014 |
| 20140062934 | CAPACITIVE TOUCH PANEL WITH FORCE SENSING - A capacitive type touch sensing device includes a first electrode array including a plurality of drive electrodes and a plurality of sense electrodes, and a second electrode array spaced apart from the first electrode array and including a plurality of discrete, electrically floating conductive regions. At least part of the second electrode array positionally overlaps with at least part of the first electrode array to define a separation distance therebetween, the separation distance varying with a force applied to a surface of the touch sensing device. Further, each conductive region is positioned relative to a respective drive electrode and sense electrode of the first electrode array so that a capacitance between certain pairs of drive and sense electrodes is more sensitive to a variation in the separation distance than a capacitance between other pairs of drive and sense electrodes. | 03-06-2014 |
