Abstract:
A multiple phase buck converter or boost converter, or buck-boost converter has an inductor in each phase. A magnetic core with a unique woven topology provides inverse coupling between the inductors. The inductors can comprise straight conductors since the magnetic core has the woven topology wrapped around each inductor. The inductors have a reduced electrical resistance since they are straight and do not loop around the magnetic core. The reduced electrical resistance increases energy efficiency and improves transient response of the circuit. The magnetic core can comprise top and bottom portions that are magnetically connected. The inductors can comprise straight circuit board traces and the circuit board can have holes to accommodate the magnetic core.
Abstract:
A voltage converter uses a component such as a JFET or four-terminal power MOSFET having no body diode and exhibiting no body diode conduction characteristic as a synchronous rectifier to reduce switching losses and body diode conduction losses and to support high frequency switching so that use of smaller components and higher current densities can be achieved. These effects are enhanced by a self-driven circuit utilizing positive feedback to enhance switching speed and reduce switching losses which increase with switching frequency.
Abstract:
An optical system is provided for achieving enhanced rejection of scattered excitation light and superior signal-to-noise performance when reading microplate wells. The optical system uses an axial configuration in which the excitation beam incident upon the sample propagates along the axis of the microplate well. Excitation light from a light source, such as a lamp or fiber optic bundle, is collimated into a beam using a lens. A reflective pick-off mirror is then used to reflect the collimated excitation beam upward along the well axis. A focusing lens, with a diameter exceeding the diameter of the collimated excitation beam, is used to focus the excitation beam in the well. The same broad lens is used to collimate the emitted fluorescent light, of which a large percentage propagates axially past the pick-off mirror towards a second focusing lens that focuses the emission beam onto the face of a fiber optic bundle. The emitted light is later filtered and detected using at a position that is optically shielded from the aforementioned optical system. The optical system is incorporated into a microplate reader or automated assay instrument in order to provide a compact assembly for sensitive fluorescence measurements either above or below the microplate. The optical system further enables the simultaneous measurement of absorbance and fluorescence in a compact optical configuration.
Abstract:
A power converter having a primary circuit (e.g. full bridge) and a secondary circuit (e.g. current doubler) has switches in the secondary circuit that are controlled by a drive circuit. The drive circuit is connected to a swing node in the primary circuit, and is powered by the primary circuit. The drive circuit has an isolation device such as a transformer to provide electrical isolation between the primary circuit and secondary circuit. The drive circuit provides a current source for driving the secondary switch gates, thereby reducing power consumption. The present drive circuit provides clean gate drive signals without noise and oscillations. The drive circuits of the invention are simple, and require only a few components.
Abstract:
A method of printing a liquid ink which is produced from a heat activated dye which is selected from a limited group of dyes which are capable of transfer at low energy. A printer which uses liquid ink, such as an ink jet printer, prints an image onto an intermediate substrate medium. The dyes contained in the ink are not substantially activated during the process of printing on to the medium. The image formed by the printed ink is transferred from the medium to a final substrate by the application of heat and pressure for a short period of time to activate the ink. The dye and dispersing/emulsifying agent(s) are selected from a limited group to produce an ink which permits thermal transfer at low energy, with the resulting image, as deposited on the final substrate, having an optical density of 1.0 or greater. Liquid ink is produced using heat activated dyes selected from a limited group of dyes that are capable of heat activation. The dyes are not substantially soluble in the liquid carrier, such as water. One or more emulsifying agents stabilize the ink formulation. A printer that uses liquid ink, such as an ink jet printer, is used to print the ink, and the dye is heat activated after printing.
Abstract translation:<?delete-start id =“DEL-S-00001”date =“20060131”?>一种印刷由热活化染料制成的液体油墨的方法,该活化染料选自能够转移的有限染料组 在低能量。 使用液体墨水的打印机,例如喷墨打印机,将图像打印到中间基板介质上。 包含在墨水中的染料在印刷到介质的过程中基本上不被活化。 由印刷油墨形成的图像通过在短时间内施加热和压力从介质转移到最终的基板以启动油墨。 染料和分散/乳化剂选自有限的组合以产生允许以低能量进行热转印的油墨,沉积在最终基材上的所得图像具有1.0或更大的光密度。 ?delete-end id =“DEL-S-00001”?> <?insert-start id =“INS-S-00001”date =“20060131”?>液体油墨是使用选自有限组 能够热活化的染料。 染料基本上不溶于液体载体,如水。 一种或多种乳化剂稳定油墨制剂。 使用诸如喷墨打印机之类的液体墨水的打印机来打印墨水,并且在打印后染料被热激活。<?insert-end id =“INS-S-00001”?>
Abstract:
An optical add/drop multiplexer (OADM) having reduced crosstalk is disclosed. The OADM uses an optical interleaver to separate channels of a wavelength division multiplexed signal into a plurality of branches. The branches then separately act on the widely spaced channels to add or drop channels. After the add/drop function is completed, the channels on the branches are recombined.
Abstract:
Reactive inks and methods of generating an image on a substrate using both reactive and heat activated inks are presented. An image is printed on a substrate, without reacting the reagents in the ink. Subsequently, the reagents are reacted to fix the image to a substrate, with substantial permanency and fastness. Sublimation or similar heat activated dyes are printed are also printed on the substrate. The sublimation or similar heat activated dyes are activated, and have an affinity for polymer that is applied to the substrate.
Abstract:
An overvoltage protection circuit for use with a power supply is proposed, wherein the power supply includes a voltage supply circuit and a diode having a first electrode and a second electrode. The overvoltage protection circuit is used to stop or reduce the output voltage of the voltage supply circuit when the output voltage of the voltage supply circuit exceeds its maximum output voltage rating. The overvoltage protection circuit comprises a first comparator for detecting a first voltage at the first electrode of the diode and outputting a first detecting signal in response to the comparison between the first voltage and the maximum output voltage rating, a second comparator for detecting a second voltage at the second electrode of the diode and outputting a second detecting signal in response to the comparison between the second voltage and the maximum output voltage rating, and a logic circuit for stopping or reducing the output voltage of the voltage supply circuit when both of the first voltage and the second voltage are higher than the maximum output voltage rating.
Abstract:
The present invention provides methods and devices for optical performance monitoring using co-located switchable fiber Bragg gratings (FBGs) in conjunction with a few detectors. This arrangement combines the merit of both tunable FBG filters and discrete detectors to achieve high spectral resolution, fast detection process and great dynamic range. By using parallel co-located FBGs in conjunction with a banded architecture, the tuning range of each FBG becomes much smaller (equivalent of ˜0.08% strain). As a result, not only does the update speed of the spectral characteristics for each channel become much faster, but it effectively eliminates the concern of FBG long-term reliability as well.
Abstract:
The present invention discloses methods and apparatus for constructing optical switch systems, in which any input optical signals can be routed to any output ports. The methods and apparatus provide advantages of configuration flexibility, modular construction, constant signal loss, and minimal numbers of switch units required. The switch systems comprise M×N switch modules. The switch module in turn comprises a two-dimensional waveguide array and a number of waveguide grating-based wavelength selective switches. With the capability of wavelength-selective routing provided by the switch modules, the optical switch systems requires a relatively small amount of switch units to extend into a very-large-scale switch system.