Patent application number | Description | Published |
20130080310 | Returns-Timing for Multiple Market Factor Risk Models - Until recently, risk models have been built using low frequency data, such as weekly or monthly data. This approach has resulted in a necessary compromise between model stability for which one needs a long history of data, and model responsiveness, for which, the shorter the history, the better. Stability plus responsiveness can be achieved if one uses daily data, which allows for a large number of observations to be used in model estimation without using long out-of-date data. Daily data have other problems, however, as the differing closing times of markets worldwide may induce spurious relationships across model factors. In particular, correlations between markets may appear lower than they truly are due to a market lag To address such issues, a stable, daily data-based factor risk model is described which takes account of the differing market closing times and corrects the model factor correlations and specific returns accordingly. | 03-28-2013 |
20130297530 | Methods and Apparatus for Improving Factor Risk Model Responsiveness - Construction of factor risk models that better predict the future volatility of returns of a portfolio of securities such as stocks, bonds, or the like is addressed. More specifically, improved factor-factor covariance estimation is made even when the covariances change rapidly over time. Methods and techniques for achieving better accuracy, responsiveness, and stability of factor risk models are addressed. | 11-07-2013 |
20140201107 | Methods and Apparatus for Improving Factor Risk Model Responsiveness - Construction of factor risk models that better predict the future volatility of returns of a portfolio of securities such as stocks, bonds, or the like is addressed. More specifically, improved factor-factor covariance estimation is made even when the covariances change rapidly over time. Methods and techniques for achieving better accuracy, responsiveness, and stability of factor risk models are addressed. | 07-17-2014 |
Patent application number | Description | Published |
20120038285 | LED SWITCH CIRCUITRY FOR VARYING INPUT VOLTAGE SOURCE - An LED array switching apparatus, comprises: a plurality of LED segments D | 02-16-2012 |
20120038615 | LED SWITCH CIRCUITRY FOR VARYING INPUT VOLTAGE SOURCE - An LED array switching apparatus, comprises: a plurality of LED arrays arranged in a serial path; a voltage supply coupled to the plurality of LED arrays; a plurality of current sources selectively coupled to the LED arrays, each of the current sources being switchable between a current regulating state and an open state; and a controller that outputs at least one control signal. The controller, the at least one switch and current sources cooperate together such that: when the voltage of the voltage source is below the at least one reference voltage, and/or when a predetermined level of current passes through the one or more current sources, at least one switch is closed and one or more associated current sources are controlled so as to break the serial path into one or more parallel paths each including less than all of the LED arrays. | 02-16-2012 |
20120056608 | STABILIZING NETWORK FOR ELECTRONIC TRANSFORMER DRIVEN LED DEVICES - A stabilization circuit is provided at an output of an electronic transformer driving circuit having a rectifier fed into a feedback-controlled oscillator circuit that drives an isolation transformer at an output of the electronic transformer driving circuit. The stabilization circuit includes: a current limiting portion that limits an amount of current delivered by the electronic transformer driving circuit. | 03-08-2012 |
20140339984 | LED Switch Circuitry for Varying Input Voltage Source - An LED array switching apparatus, comprises: a plurality of LED segments D | 11-20-2014 |
20150156831 | LED SWITCH CIRCUITRY FOR VARYING INPUT VOLTAGE SOURCE - An LED array switching apparatus, comprises: a plurality of LED arrays arranged in a serial path; a voltage supply coupled to the plurality of LED arrays; a plurality of current sources selectively coupled to the LED arrays, each of the current sources being switchable between a current regulating state and an open state; and a controller that outputs at least one control signal. The controller, the at least one switch and current sources cooperate together such that: when the voltage of the voltage source is below the at least one reference voltage, and/or when a predetermined level of current passes through the one or more current sources, at least one switch is closed and one or more associated current sources are controlled so as to break the serial path into one or more parallel paths each including less than all of the LED arrays. | 06-04-2015 |
Patent application number | Description | Published |
20110115401 | METHOD AND APPARATUS FOR CONTROLLING BRIGHTNESS OF LIGHT EMITTING DIODES - A circuit for driving a light emitting diode (LED) comprises: an alternating voltage power supply, comprising a triac dimmer having a firing angle and output terminals that provide power to the LED; a zero crossing detector that detects a polarity change of the alternating voltage provided by the alternating voltage power supply and provides a zero crossing output signal indicative of the zero crossing; a timer triggered by the zero crossing output signal that generates a timer output signal during a time period of the timer; and LED power circuitry that reduces current to the light emitting diode based upon timing characteristics of the timer output signal. | 05-19-2011 |
20130043799 | LIGHT ENGINE WITH LED SWITCHING ARRAY - An LED array switching apparatus comprises, on a single PCB substrate: a plurality of LED arrays D | 02-21-2013 |
20130113375 | TRIAC DIMMABLE POWER SUPPLY UNIT FOR LED - A power-factor-corrected power supply adapted to supply power to one or more light emitting diodes (LEDs), comprises: a triac dimmer electrically connected between an alternating current source and a bridge rectifier; a damping circuit electrically connected between the alternating current source and the bridge rectifier; a bleeder circuit configured to conduct current between a supply terminal of the bridge rectifier and ground only when a triac in the triac dimmer is not conducting current; a fast startup circuit configured to conduct current between the supply terminal of the bridge rectifier and a voltage supply terminal of a power-factor-corrected controller when the triac dimmer is initially turned on until a supply voltage capacitor coupled to the voltage supply terminal of the power-factor-corrected controller has charged; a dimming slope control circuit configured to reduce a first voltage sensed at a current sensing terminal of the power-factor-corrected controller, such that a reduced amount of current is supplied to the one or more LEDs at a given firing angle, wherein the first voltage is representative of a current flowing through a primary winding of a flyback transformer; and a dummy load circuit provided in parallel with the one or more LEDs to draw a holding current for the triac only after the triac is turned on. | 05-09-2013 |
20150015142 | LED LIGHT BULB WITH LEDS MOUNTED ON ANGLED CIRCUIT BOARD - An LED light bulb has a lamp base for a lamp socket, a heat sink, and a globe. Within the globe on the heat sink is a printed circuit board having tabs or legs projecting from the circuit board. The tabs or legs have one or more LEDs mounted thereon and are angled relative to the circuit board so as to be directed away from the axis of the light bulb. the circuit board may either be ring-shaped with inwardly extending tabs, or may have outwardly extending tabs. Methods of making such LED light bulb and methods of distributing light from the LED light bulb, which involves directing light output by a plurality of LEDs in a plurality of radially outward directions relative to an axis of the light bulb, are also disclosed herein. | 01-15-2015 |
20150042236 | METHOD AND APPARATUS FOR CONTROLLING BRIGHTNESS OF LIGHT EMITTING DIODES - A circuit for driving a light emitting diode (LED) comprises: an alternating voltage power supply, comprising a triac dimmer having a firing angle and output terminals that provide power to the LED: a zero crossing detector that detects a polarity change of the alternating voltage provided by the alternating voltage power supply and provides a zero crossing output signal indicative of the zero crossing; a timer triggered by the zero crossing output signal that generates a timer output signal, during a time period of the timer; and LED power circuitry that reduces current to the light emitting diode based upon timing characteristics of the timer output signal. | 02-12-2015 |
20150084527 | METHOD AND APPARATUS FOR CANCELLING OUTPUT CURRENT RIPPLES IN LED DRIVING CIRCUITS - A device and method for reducing current ripple to a light emitting diode array having a single stage power factor correction driver with an output voltage ripple that is reduced by using a linear current regulator connected in series between the single stage power factor correction driver and the light emitting diode array, which actively adjusts an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver. | 03-26-2015 |
20150102738 | AC LED ARRAY CONFIGURATION SWITCHING CIRCUIT TRIGGERED BY SOURCE VOLTAGE LEVEL - An LED lighting circuit where the configuration of the connection of two or more LEDs are changed from parallel to series through the use of solid state switches depending on whether the voltage level from an AC source measured by a voltage detector exceeds the sum of the forward voltages of the LEDs. Also, a method of activating LEDs in an LED array lighting apparatus involving applying a rectified alternating current to two or more LEDs, each LED having a forward bias voltage; comparing the rectified alternating current to the sum of the forward bias voltages of the two or more LEDs; and changing the circuit configuration of the two or more LEDs between a parallel connection and a series connection with respect to the rectified alternating current depending on whether the rectified alternating current exceeds the sum of the forward bias voltages of the two or more LEDs. | 04-16-2015 |
20160113083 | METHOD AND ARRANGEMENT FOR REMOTELY DRIVING LIGHT EMITTING DIODES FROM A THREE-PHASE POWER SOURCE VIA A SINGLE PHASE CABLE SYSTEM - Multiple LEDs connected in series are driven by DC voltage that is provided by a diode rectifier connected to a three-phase power source. In order to reduce ripple in the DC voltage, the series-connected LEDs can be divided into a first set and a second set, and a first constant current source is provided that drives the first set, and a second constant current source is provided that drives the second set. The first and second constant current sources are both connected across the outputs of the rectifier circuit, and operate to drive the respective sets of light emitting diodes in alternation. The capability for dimming can be provided, as well as back-up single phase operation. The light emitting diodes can be situated remote from said rectifier and connected thereto by a single phase power transmission system, formed by only two wires. | 04-21-2016 |
Patent application number | Description | Published |
20100200147 | Adhesive bonding method - The present invention provides an adhesive bonding method including: providing a first component and a second component to be bonded and an adhesive; positioning the adhesive between the first component and the second component with the adhesive contacting with the first component and the second component; providing at least one light concentrator; and providing a light source and making at least partial light beams of the light source pass through the light concentrator and the first component in order, and then irradiate on the adhesive to cure the adhesive so as to bond the first component and the second component. The adhesive bonding method of the instant invention can maintain the alignment precision between the components being bonded so as to optimize products' performances. The invention also provides a plate installing device with a light concentrator, which can be installed by the adhesive bonding method above mentioned. | 08-12-2010 |
20110194186 | Method for manufacturing polymer miniature lens and collimator including the polymer miniature lens - A method for manufacturing a polymer miniature lens on a substrate with the lens forming pattern, and the liquid polymer is dispensed therein. The lens forming pattern having a periphery area and an interior area, most portion of the periphery area having a property of confining liquid polymer, while the interior area having at least one portion exposing the surface of the substrate; depositing liquid polymer onto the lens forming pattern; and curing the liquid polymer after the liquid polymer reaches equilibrium shape and is confined to the periphery area. The invention also discloses a collimator including the polymer miniature lens. | 08-11-2011 |
20110198014 | ADHESIVE BONDING METHOD - The present invention provides an adhesive bonding method including: providing a first component and a second component to be bonded and an adhesive; positioning the adhesive between the first component and the second component with the adhesive contacting with the first component and the second component; providing at least one light concentrator; and providing a light source and making at least partial light beams of the light source pass through the light concentrator and the first component in order, and then irradiate on the adhesive to cure the adhesive so as to bond the first component and the second component. The adhesive bonding method of the instant invention can maintain the alignment precision between the components being bonded so as to optimize products' performances. | 08-18-2011 |
20120011286 | Optical communication module, universal serial bus cable with the same and processing method of data transfer thereof - The present invention discloses an optical communication module comprising a second mode supporting a data transfer of USB 3.0 standard and a third mode supporting a data transfer of USB 2.0 standard, and the second mode comprises A mode and B mode with a different power consumption and supported data rate, and a detect unit operative to detect idle state of the data traffic on the data path of USB 3.0 standard to determine to stay on the A mode or enter to the B mode automatically during operation in the second mode. The control circuitry can work in different modes to support different status of devices attachment and removal, different data rate of USB 2.0 and 3.0 standards; and it can real time monitor the data traffic to switch different modes to save power consumption. The present invention also discloses a USB cable and a processing method of data transfer for an optical communication module. | 01-12-2012 |