205 results about "Reversed polarity" patented technology

A dual output buck-boost power converter operates with a single inductor to achieve high efficiency with automatic or inherent load balancing. Switches associated with the opposite polarity outputs are driven based on feedback signals, with one feedback signal being a reference voltage and another feedback signal being related to an opposite polarity output. The opposite polarity feedback signal is provided to a comparator with a reversed polarity to achieve a simple balanced control that maintains polarity outputs. The power converter delivers power to each output with each switching cycle and uses a single inductor to achieve high efficiency performance.

Systems, tools and methods of assaying biological material are used to perform complex sandwich hybridization assays. The tools used comprise biological solution probes that are customized for each assay. The solution probe comprises a first region for hybridizing to a probe, in a generic set of capture probes on a universal assay apparatus, and a second region for hybridizing to a target in a sample. The solution probe assembles the target to the assay apparatus by hybridizing the second region to the target and the first region to the capture probe. In array assays, one or more biological samples, having one or more targets per sample, can be multiplexed on the same universal array comprising the generic set of capture probes in an array pattern of features on the substrate. The customized solution probe addresses and assembles a predetermined target-sample combination onto the array at a corresponding capture probe address location. The systems, tools and methods have specificity and sensitivity by systematically providing a reduced likelihood of cross-hybridizations and intramolecular structures in the probes. Specificity and sensitivity of the assay are provided by the incorporation of a chemically modified monomer in the capture probe and a similarly modified monomer complement in the first region of the solution probe. The modified monomers preferentially hybridize with each other. When the probe and respective probe region are oligonucleotides, the complementary modified nucleotides have a reversed polarity relative to the polarity of the respective probe and probe region. The complementary reversed polarity nucleotides form a thermodynamically more stable hybridization to each other than a hybridization between the reversed polarity nucleotide and a complementary nucleotide whose polarity is not similarly reversed.

A liquid crystal display of this invention includes a plurality of scan lines, a plurality of data lines, and pixels provided at each intersection of the plurality of scan lines and the plurality of data lines. The liquid crystal display further includes a plurality of pixel groups constituted of the pixels provided at each intersection of the consecutive plurality of data lines and one of the plurality of scan lines, in which signals of the same polarity are outputted to all data lines included in each of the plurality of pixel groups by a time-sharing drive that sequentially outputs signals, and reversed polarity signals are outputted to the plurality of pixel groups adjacent to each other, so that signals with polarities inverted after each frame are outputted to the data lines included in the pixel groups.

An electrically regeneratable battery of electrochemical cells for capacitive deionization (including electrochemical purification) and regeneration of electrodes is operated at alternate polarities during consecutive cycles. In other words, after each regeneration step operated at a given polarity in a deionization-regeneration cycle, the polarity of the deionization step in the next cycle is maintained. In one embodiment, two end electrodes are arranged one at each end of the battery, adjacent to end plates. An insulator layer is interposed between each end plate and the adjacent end electrode. Each end electrode includes a single sheet of conductive material having a high specific surface area and sorption capacity, preferably a sheet formed of carbon aerogel composite. The batter further includes a plurality of generally identical double-sided intermediate electrodes that are equidistally separated from each other, between the two end electrodes. As the electrolyte enters the battery of ells, t flows through a continuous open serpentine channel defined by the electrodes, substantially parallel to the surfaces of the electrodes. By polarizing the cells, ions are removed from the electrolyte and are held in the electric double layers formed at the carbon aerogel surfaces of the electrodes. As the electrodes of each cell of the battery are saturated with the removed ions, the battery is regenerated electrically at a reversed polarity from that during the deionization step of the cycle, thus significantly minimizing secondary wastes.

The invention provides a welding method of a stainless steel composite board, comprising the following steps of: (a) machining a groove: machining the welding end of the stainless steel composite board into an X-shaped groove, wherein an included angle of the X-shaped grooves is 65+/-5 degrees, a gap at the middle part of the groove is 2+/-1mm, and the root of the groove is 1-2mm distant from a composite interface; (b) welding a basement layer: dividing the basement layer into three layers: a base layer (1), a filling layer (2) and a covering layer (3), and welding the base layer (1), the filling layer (2) and the covering layer (3) in sequence; (c) welding a transition layer: carrying out straight welding by adopting a minor-diameter welding rod or a welding wire and adopting the small-scale reversed polarity; and (d) welding a multiple layer: welding by adopting small current, high welding speed and low heat input.

The invention relates to a single-end fault ranging method based on initial reversed-polarity directional traveling wave detection, which can effectively realize single-end traveling wave fault ranging and has high reliability and high accuracy. The method comprises the following steps: (1) when a traveling wave fault ranging device is started, testing the arriving time t1 of the line modular component of the initial traveling wave of a fault, and extracting traveling wave signals in the time interval [0, 2L/v], wherein L indicates the length of the line, and v indicates the wave speed of theline module component; (2) testing the initial reversed-polarity directional traveling wave in the time interval, calculating the difference of the arriving time of the line modular component of the initial reversed-polarity directional traveling wave and the arriving time of the line modular component of the initial traveling wave of the fault, determining whether the fault is a nearby fault or a remote fault with reference to Curve Chart 3, and accordingly determining the section with the fault point; (3) judging the properties of the second arriving wave head through the determined fault section; and (4) determining final ranging results through the initial traveling wave and the wave head of the second traveling wave of the fault.

The invention discloses a monitoring system of multi-component gas pollutants in air of a chemical industrial park. The monitoring system comprises a PID sensor, an electrochemical sensor, a catalytic combustion sensor, a geographic information determination apparatus a signal conversion apparatus, a memory, a controller, an acousto-optic alarm apparatus, wherein the PID sensor, the electrochemical sensor, and the catalytic combustion sensor commonly form a part for frontal acquisition and detection of the pollutants of the monitoring system, and the part of the monitoring system is used for pollutant kind determination and parameter coupling analysis. The PID sensor comprises a gas acquisition device, a filtering device, and a photo-ionization sensor detection device; the electrochemical sensor comprises a gas acquisition device, a dedusting device, and an electrochemical sensor detector; and the catalytic combustion sensor detector comprises a gas acquisition device, a catalytic combustion sensor detector, and an outrange and reversed polarity protection device. The monitoring system also comprises the controller for statistics and analysis of detection results, and the acousto-optic alarm apparatus for alarm when the gas concentration in the pollutants exceeds a standard.

An integrated circuit (IC) has logic and timing circuits that are coupled to discrete circuitry to provide protection and indications whenever an AC adapter that is faulty or has improper voltage levels or polarity are plugged into a system. In particular, the IC device provides over-voltage, under-voltage, and reversed-polarity protections to an electronic system to keep the electronic system from being damaged by an alternating current (AC) adapter having an improper voltage range or voltage polarity. It also provides a protection that prevents an adapter from powering a host system that has a short-circuit fault.

A feedback circuit for an isolated power converter includes an opto-coupler and a reversed polarity regulator. The opto-coupler provides a current related to an output voltage of the isolated power converter. When the isolated power converter enters light load, the output voltage rises and the reversed polarity regulator reduces the current to decrease the power consumption and thus improve the light load efficiency of the isolated power converter.

A system for connecting a receiver to a redundant power supply. The power supply units are connected to the receiver by means of a pair of control switches, each being connected in series between one of the power units and the receiver, and each having its intrinsic diode forwardly biased between the power unit and the receiver. A voltage comparator senses which of the power supply units is having the higher potential difference between its high and low potential terminals. The output of the comparator controls the gate of both control switches such that the control switch in series with the sensed power supply unit is conducting while the other one is off. When a reversed polarity is applied to the receiver, the receiver is protected by the intrinsic diode. When at least one of the power supplies is connected with the correct polarity, the receiver is supplied without an appreciable voltage drop and with the lowest possible power losses.

The invention belongs to a relay protection controlling technology of a power transmission and distribution network, and relates to a longitudinal differential protection current phase compensation method for an YNd5 transformer, which comprises the steps of enabling TA secondary windings of the high-voltage side and the low-voltage side of the YNd5 transformer to be in Y connection; b, connecting the A-phase current, B-phase current and the C-phase current of the Y-side TA secondary windings of the transformer to loops of the A-phase current, the B-phase current and the C-phase current of a YNd11 transformer differential protection device; c, connecting each phase current of the d-side TA secondary windings of the transformer into the YNd11 transformer differential protection device according to the reversed polarity of each d-side phase current of the YNd5 transformer; and d, utilizing the YNd11 transformer protection device to finally realize the differential protection phase compensation of the YNd5 transformer. The longitudinal differential protection current phase compensation method for the YNd5 transformer is simple in principle, convenient to implement and can adapt to the longitudinal differential protection current phase compensation of the YNd5 connecting transformer.

A magnet system having a pair of parallel plate-like permanent magnets in which magnetic poles of reversed polarities are opposed to each other with a space therebetween. The pair of permanent magnets includes main portions magnetized in the same direction as their thickness direction, and peripheral portions magnetized in a direction different from their thickness direction.

Disclosed is an electrophoretic display and a method for driving the electrophoretic display. The method for driving the electrophoretic display, which includes a first electrode, a second electrode, and an electrophoretic layer including electrophoretic particles disposed in a plurality of pixels receiving the voltage for driving from the first electrode and the second electrode and provided between the first electrode and the second electrode includes applying a reset voltage to the pixels, applying a reset compensation voltage including reversed polarity to the reset voltage to the pixels, applying an image display voltage including the same or different polarity during a predetermined time between the neighboring pixels, and applying an image display compensation voltage including reversed polarity to the image display voltage to the pixels during a predetermined time. The foregoing method provides a potential distribution which is symmetrical in the boundary region between the neighboring pixels such that the display size of the real image of each of the pixels is uniform and an afterimage may be prevented, thereby improving the display performance.

The invention belongs to a relay protection controlling technology of power transmission and distribution network, and relates to a longitudinal differential protection current phase compensation method for an YNd7 transformer, which comprises the steps of enabling TA secondary windings of the high-voltage side and the low-voltage side of the YNd7 transformer to be in Y connection; b, connecting the A-phase current, B-phase current and the C-phase current of the Y-side TA secondary windings of the transformer to loops of the A-phase current, the B-phase current and the C-phase current of a YNd11 transformer differential protection device; connecting each phase current of the d-side TA secondary windings of the transformer into the YNd1 transformer differential protection device according to the reversed polarity of each d-side phase current of the YNd7 transformer; and d, utilizing the YNd1 transformer protection device to finally realize the differential protection phase compensation of the YNd7 transformer. The longitudinal differential protection current phase compensation method for the YNd7 transformer is simple in principle, convenient to implement and can adapt to the longitudinal differential protection current phase compensation of the YNd7 connecting transformer.

The invention discloses a reversed polarity protection circuit of a power supply. The reversed polarity protection circuit comprises an electronic switch, a pump power supply driving circuit and a reversed polarity detection circuit, wherein the electronic switch comprises a first end connected with a power supply input end, a second end connected with a power supply output end, and a control end; the pump power supply driving circuit is connected with the second end of the electronic switch and is used for generating driving voltage higher than power supply input voltage when a power supply is in normal polarity; the reversed polarity detection circuit is connected with the first end and the control end of the electronic switch; when the power supply is in normal polarity, the reversed polarity detection circuit is driven by the driving voltage generated by the pump power supply driving circuit and outputs control signals for conducting the first end and the second end of the electronic switch, to the control end of the electronic switch; and when the power supply is in reverse polarity, the reversed polarity detection circuit is used for outputting control signals for disconnecting the first end and the second end of the electronic switch, to the control end of the electronic switch. The reversed polarity protection circuit disclosed by the invention can be used for controlling the conduction and the disconnection of the input end and the output end of the power supply conveniently, rapidly and effectively so as to protect terminal equipment at the output end of the power supply.

An inverter transformer for lighting multiple discharge lamps is provided which has a plurality of output voltages including reversed polarity output voltages while ensuring a reliable insulation performance, and which is produced in a small size and at a low cost. An inverter transformer includes a magnetic core assembly, and a plurality of bobbins each having a primary winding and a secondary winding wound therearound. Adjacent two bobbins of the bobbins constitute either a first bobbin pair which are provided with respective secondary windings at which output voltages having their polarities reversed from each other are induced, or a second bobbin pair. An insulation distance setting means are provided between the two bobbins so that the distance between the secondary windings disposed at the two bobbins and of the first bobbin pair is larger than the distance between the secondary windings disposed at the two bobbins of the second bobbin pair.

A liquid crystal display of this invention includes a plurality of scan lines, a plurality of data lines, and pixels provided at each intersection of the plurality of scan lines and the plurality of data lines. The liquid crystal display further includes a plurality of pixel groups constituted of the pixels provided at each intersection of the consecutive plurality of data lines and one of the plurality of scan lines, in which signals of the same polarity are outputted to all data lines included in each of the plurality of pixel groups by a time-sharing drive that sequentially outputs signals, and reversed polarity signals are outputted to the plurality of pixel groups adjacent to each other, so that signals with polarities inverted after each frame are outputted to the data lines included in the pixel groups.

The invention discloses a polarity testing device of horns, and the device comprises a single chip microcomputer, a left sound channel output control circuit, a left microphone, a front voltage amplification circuit of the left microphone, a left power amplification circuit, a left zero-crossing comparison circuit, a right sound channel output control circuit, a right microphone, a front voltage amplification circuit of the right microphone, a right power amplification circuit, a right zero-crossing comparison circuit, an alarm circuit, a keyboard control/function conversion circuit and a power circuit. The device can conveniently detect whether earphones have the problem that a left horn and a right horn are in reversed connection and whether a single horn has the problem of reversed polarities, thereby helping improve the outgoing quality of the horns.

The invention provides a reversed-polarity AlGaInP-based LED coated with ITO on the surface and a manufacturing method thereof, belonging to the technical field of semiconductors. Since an ITO extended current extension layer is used to replace an n-type AlGaInP current extension layer, the current extension uniformity of an LED chip can be improved, the problem of light absorption of the n-type AlGaInP current extension layer can be avoided and therefore the light emitting efficiency is increased. Thus, both the service life and the photoelectric conversion efficiency of the reversed-polarity AlGaInP-based LED can be enhanced. The reversed-polarity AlGaInP-based LED coated with ITO on the surface and the manufacturing method thereof provided by the invention have the advantages of simple process and great convenience in production operation.

The invention provides a same-tower double-power transmission circuit single-end traveling wave fault location method, and belongs to the technical field of relay protection of electrical power systems. When a fault occurs to a same-tower double-power transmission circuit, voltage traveling wave data of each phase are detected and recorded; a voltage traveling wave mode maximum value of a fault phase is obtained by converting small waves, and distribution of a traveling wave head on a time axis is obtained; an initial reversed-polarity traveling wave head is marked, and a moment corresponding to the initial reversed-polarity traveling wave head is used as a referential moment to calculate the distance reflected by a same-polarity traveling wave head between an initial fault traveling wave head and the initial reversed-polarity traveling wave head; meanwhile, the moment when the initial fault traveling wave head arrives is used as a referential moment to calculate the distance reflected by the same-polarity traveling wave head between the initial fault traveling wave head and the initial reversed-polarity traveling wave head; two pairs of distances which are close or equal are found from the two sets of distances, and then the distance really reflecting the fault position is distinguished out through a simulation method after measurement.