74results about How to "Reduce spikes" patented technology

Systems and methods are provided for switching between power supply rail voltages for a differential driver device of a class G amplifier device. The amplifier device employs power MOSFETs to switch between supplying high supply voltages and low supply voltages to the power rails of the differential driver. The class G amplifier can be employed in driving an ADSL signal over a telephone line. A control device ramps the power supply rail voltage between low power supply states and high power supply states to mitigate noise and spikes that can be coupled to the output signal.

A system mitigates the effects of a market spike caused by the triggering and election of conditional orders in an automated matching system. The system monitors trading that takes place as a result of the cascading triggering of conditional orders. When an order is executed beyond a predetermined price threshold, an instrument may be flagged, allowing matching to take place only at or within the predetermined price threshold. Orders within the price threshold are matched at the price threshold against orders beyond the price threshold, in order to dampen any instantaneous damaging effects of the price spike. The system may adjust the price threshold when market appropriate, allowing the order flow to bring the market back to whatever is the true price level. The system mitigates price fluctuations that are purely conditional order cascade driven, but allows the market to continuously trade in controlled price and time intervals to ensure that a true market move can still occur and not have price control mechanisms hinder trade matching and true price discovery.

The invention discloses a full-bridge zero-voltage boost switching resonant converter based on LLC used for UPS. The converter is characterized in that resonant converting circuit in DC / DC convertingmodule is full-bridge LLC resonant converting circuit and the converting circuit comprises switch bridge which is composed of four main switching tubes through full-bridge connection, main transformerof which primary winding is in parallel with excited inductor, series resonance inductors connected with the main transformer, series resonance capacitors, and LLC resonance network composed of excited inductor, series resonance inductors and series resonance capacitors, wherein the network is connected with the two output ends of the switch full-bridge, and output sides of the main transformer is synchronous full wave rectifying circuit composed of two groups of rectifying diodes and are separately connected with two output capacitors sharing the same ground wire. The full-bridge zero-voltage boost switching resonant converter of the invention overcomes the defect that switch tube zero-voltage conduction in full scope is hard to realize, the work is easy to reach optimal state, the testvalue of the practical boosting circuit efficiency is about 95%, the volume of electromagnetic elements is reduced, the circuit is simplified and the cost is reduced.

An energy storage device and methods for controlling the same are disclosed. The energy storage device can include a connector to or from which at least one battery pack is attached or detached, a power converter that converts external input power into DC power in a charge mode, and a switching unit that performs a switching operation such that the DC power converted by the power converter is charged in a first battery pack attached to the connector in the charge mode. Energy storage device can also include a controller that controls the switching unit to turn off electrical connections between the energy storage device and the first battery pack and a second battery pack for a predetermined off period when the first and second battery packs are attached to the connector. Accordingly, when a battery pack is attached or detached, a surge of inrush current may be reduced.

A system mitigates the effects of a market spike caused by the triggering and the election of a conditional order in an automated matching system. Conditional orders submitted to a trading engine are evaluated to compare a price of an order to a predetermined price range. Matching of the orders may be delayed when the price of the orders lies outside of the predetermined price range. An opening price to be used by the trading engine is derived and a time interval is used to delay a matching of the orders until the opening price is within a predetermined price range up to a maximum delay time set by a control center. Implied spreads are also removed until other instruments within a trading unit are verified open.

A system mitigates the effects of a market spike caused by the triggering and election of conditional orders in an automated matching system. The system monitors trading that takes place as a result of the cascading triggering of conditional orders. When an order is executed beyond a predetermined price threshold, an instrument may be flagged, allowing matching to take place only at or within the predetermined price threshold. Orders within the price threshold are matched at the price threshold against orders beyond the price threshold, in order to dampen any instantaneous damaging effects of the price spike. The system may adjust the price threshold when market appropriate, allowing the order flow to bring the market back to whatever is the true price level. The system mitigates price fluctuations that are purely conditional order cascade driven, but allows the market to continuously trade in controlled price and time intervals to ensure that a true market move can still occur and not have price control mechanisms hinder trade matching and true price discovery.

Multilevel voltage arrangement having a transformer and a power converter or inverter comprising one or more common DC links connectable to a power source, said arrangement comprising one first set of H bridges being connected to said common DC link, wherein each of said H bridges comprises with at least two nodes connected to the ends of wirings at the primary side of a transfer, wherein control means are configured for controlling H bridges so as to achieve a multilevel voltage signal between the first node and the second node of said H bridges.

A method and system for operating an engine wherein ignition of the engine is activated according to a predetermined timing schedule that references engine speed, and the ignition is suppressed above a predetermined engine speed threshold to allow engine speed to fall below the predetermined engine speed threshold. Thereafter, ignition is reactivated according to timing that is retarded relative to the predetermined timing schedule for a predetermined number of engine revolutions substantially when the engine speed has fallen below the predetermined engine speed threshold, thereby mitigating undesirable spikes in combustion chamber maximum pressure.

The invention discloses a power supply system, a power module in the power supply system and a manufacturing method for the power module. The power module comprises a first common pin, a second common pin, a first bridge arm and a second bridge arm. The first common pin and the second common pin are symmetrically arranged on one side of a substrate. The first bridge arm comprises a first semiconductor device and a second semiconductor device, wherein the first semiconductor device and the second semiconductor device are mutually connected through the first common pin and adjacently arranged. The second bridge arm comprises a third semiconductor device and a fourth semiconductor device, wherein the third semiconductor device and the fourth semiconductor device are mutually connected through the second common pin and adjacently arranged. The first semiconductor device and the third semiconductor device are symmetrically arranged, and the second semiconductor device and the fourth semiconductor device are symmetrically arranged.

A surface emitting semiconductor laser device comprising: a layered structure in which a light-emitting layer is disposed between a pair of reflector layered structures formed by hetero junction of a plurality of semiconductor materials, the layered structure being formed on a substrate and an impurity being doped into the reflector layered structure; wherein in the reflector layered structure the doping concentration of said impurity into a region positioned in the vicinity of the light-emitting layer is relatively smaller than the doping concentration of said impurity into other regions spaced from the light-emitting layer; and at the same time, in the reflector layered structure the region positioned in the vicinity of said light-emitting layer has a relatively smaller energy gap difference DELTAEg between the semiconductor materials forming the region than the energy gap difference DELTAEg between the semiconductor materials forming the other regions, and the driving voltage can be reduced without the deterioration of the optical output power characteristics.

A rotation generation device is provided that includes: at least one pair of Cylindrical Containers having Chambers therein at each end to receive and discharge a fluid, the Cylindrical Containers interconnected via a tubular member and mounted essentially perpendicular to a Shaft; Threaded Caps with dual nozzles that screw on to each Chamber at the end of the Cylindrical Containers; two or more Pistons, each Piston interconnected to another Piston via a hollow tube, each Piston resides in a sliding relationship in a respective Cylindrical Container and wherein the hollow tube resides in the tubular member, the hollow tube having a length for a first of the two or more pistons to cause one of the Cylindrical Containers to receive fluid as the first piston slides within the respective Cylindrical Container, while a second of the two or more pistons causes another of the Cylindrical Containers to discharge fluid therein; a weight, residing and capable of moving laterally within the hollow tube; Pipes interconnecting adjacent Cylindrical Containers via the Cap nozzles; bellows within each Chamber of the Cylindrical Containers, wherein each bellow attaches on one end to a Piston and at an opposite end to the Chamber of the Cylindrical Container.

A computer-implemented method for determining a water treatment parameter includes receiving, by a computer, measurements of a fluorescence emission spectrum of a water sample including a first peak emission wavelength and at least a second peak emission wavelength, emitted in response to an excitation wavelength, receiving, by the computer, an absorbance measurement obtained at the excitation wavelength of the water sample, determining, using the computer, a ratio of the measurements at either the second peak emission wavelength, or a sum of measurements at a plurality of peak emission wavelengths including at least the first peak emission wavelength and the second peak emission wavelength, to the first peak emission wavelength, and calculating, using the computer, a value for the water treatment parameter based on a combination of at least the ratio and the absorbance measurement.

A monitoring system configured to receive an on-line sample associated with a process includes a sample chamber positioned to receive the on-line sample and a detector positioned to selectively receive and detect multiple wavelengths of light transmitted through the sample during an absorbance measurement, and emitted by the sample during a fluorescence measurement in response to illumination by each of the at least one excitation wavelength. An optical fiber couples light transmitted through the sample and directs the transmitted light to the multi-channel detector during the absorbance measurement. Optics direct light emitted by the sample during the fluorescence measurement to the detector without passing through any optical fiber. A computer in communication with the detector is configured to correct the fluorescence measurement using the absorbance measurement and determine a sample parameter based on the fluorescence and absorbance measurements of the on-line sample.

The invention relates to a driving circuit of a Cascode type GaN power device. A turn-on loop and a turn-off loop of the GaN driving circuit are separated, and a turn-on acceleration capacitor and a turn-off acceleration capacitor with different capacitance values are adopted in the turn-on loop and the turn-off loop respectively to connect a turn-on gate resistor and a turn-off gate resistor in parallel, so that different dynamic and steady grid currents are provided for the GaN power device, the turn-on and turn-off processes are accelerated, the turn-on and turn-off time is shortened, and meanwhile, the peak and oscillation of voltage and current are reduced; the voltage peak, the current peak, the oscillation, the turn-on time and the turn-off time of the GaN power device in the switching process are reduced, and the requirements for high reliability, small loss and high switching speed of the GaN driving circuit are met. According to the invention, the performance requirement of the GaN power device under a high-frequency condition can be met, high switching speed and low switching loss are ensured, meanwhile, voltage and current peaks and oscillation of the drain and source electrodes in the switching-on and switching-off processes of the GaN power device can be effectively suppressed, and high-reliability work of the GaN power device is ensured.

The invention discloses a vibrating diaphragm of a loudspeaker and the loudspeaker comprising the vibrating diaphragm. A cone-shaped inclination part of the vibrating diaphragm of the loudspeaker is provided with a through hole, a waterproof sheet covers the through hole, and therefore peaks of mid-high frequency bands in a frequency response curve of the loudspeaker can be reduced, so that the frequency response curve of the mid-high frequency bands is more smooth, the sound effect is improved, and original sound can be reflected more truly.

The invention provides an inverter used for converting DC to AC. The inverter comprises a DC power supply, a first switching module, a second switching module, an inductor and a control circuit. The DC power supply produces the DC, the first switching module and the second switching module are used for receiving the DC, and the first switching module and the second switching module are connected in parallel. One parallel end of the first switching module and one parallel end of the second switching module are grounded in a point mode. The other parallel end of the first switching module and the other parallel end of the second switching module are in point connection with one end of the inductor. The other end of the inductor is used for outputting the AC. The control circuit emits a sine pulse width modulation signal serving as a control signal to control the first switching module and the second switching module to alternately output voltage to the inductor. The inductor is used for converting the DC to the AC in cooperation with the first switching module and the second switching module. According to the inverter, the size and the weight of the inverter can be effectively reduced, electromagnetic interference is reduced, and therefore the inverter has long service life.

The pulse transformer for a driving an isolated gate double-base transistor in the invention changes layering and grouping coiling into mixing layer coiling, thus strengthening and deepening coupling degree, so that the parameters and functions such as impedance, inductance, coupling degree, waveform and the like of various secondary levels and windings are basically consistent, thus providing identical driving waveform and conditions for a bridge arm which needs to open and close simultaneously in the working process of IGBT, improving the working reliability of IGBT, reducing noise wave and spike, improving efficiency and reducing loss. The adoption of high-temperature lead can satisfy high-standard requirements, and the selection of a can-shaped magnetic core ensures excellent shielding effect and improves performance index of electromagnetic compatibility of the pulse transformer. Summarizing all the advantages, the IGBT driving transformer is an ideal transformer for driving IGBT.

The invention discloses a low power consumptionlow differential voltage linear voltage regulator system. The system comprises alow power consumption benchmark circuit, an under-voltage locking circuit connected with the low power consumption benchmark circuit, a low differential voltage linear voltage regulator circuit connected with the low power consumption benchmark circuit and the under-voltage locking circuit respectively, wherein the low power consumption benchmark circuit outputs benchmark voltage signals to the under-voltage locking circuit, the low power consumption benchmark circuit outputs bias current signals and benchmark voltage signals to the low differential voltage linear voltage regulator circuit. The low power consumption low differential voltage linear voltage regulator system can substantially enhance the transient response performance of the LDO circuit.

The invention discloses a five-level inverter and a method for controlling leakage current thereof. The five-level inverter is characterized in that a first switch tube and a second switch tube which are serially connected with each other are connected to two ends of a power source in parallel and are used as additional bridge arms. A conducting state of the first switch tube and a conducting state of the second switch tube are controlled, voltage between a first node of the five-level inverter and a negative end of the power source is in smooth transition at a zero-crossing point by the aid of a certain control strategy, peak is reduced, and accordingly the magnitude of the leakage current is reduced.

A connector interface may include an arrangement of contacts in a first connector, and a corresponding, complementary arrangement of contacts in a second connector mating with the contacts of the first connector. The contacts may be signal contacts or ground contacts. When the connectors are mated, a ground may be established between the connectors by the mating of the ground contacts from the respective connectors. The ground contacts in the first connector may be shaped to bridge together an array of ground contacts in the second connector when the connectors are mated. Such bridging tends to establish a continuous ground along the array of ground contacts, creating a more robust ground than in an otherwise identical connector.

A voltage converter comprises at least two capacitive charge pump stages, each comprising a capacitor, a charging switch through which a capacitor charging current is adapted to flow, and a control circuit for controlling the charging switch. wherein the control circuit for at least one charge pump stage comprises current limiting means for limiting the current through the charging switch. By limiting the current flowing through the switch, current spikes are avoided, which reduces high frequency distortion.

A method is provided for controlling an operating frequency of an integrated circuit when operating modes with different operating frequencies are changed. The method comprises the step of changing the operating frequency of the integrated circuit to an operating frequency of an operating mode after changing, in a stepwise manner.

This invention relates to vehicle suspension systems and devices, and particularly to vehicle suspension systems and devices having an air spring with adjustable and / or tunable characteristics. The vehicle suspension may generally include features for modifying the spring rate of an air spring, such as, for example, to increase initial suppleness and to decrease spiking during later portions of travel. In an exemplary aspect, the fork may include features for decreasing the initial volume of the air chamber of the positive air spring during the initial part of travel and may further include features for expanding the air chamber of positive air spring during a later part of travel.

A 5-IDT type longitudinally-coupled resonator type elastic wave filter device with narrowly-pitched electrode finger sections improves steepness of the filter characteristics. It is a 5-IDT type longitudinally-coupled resonator type elastic wave filter device (1) having first through a fifth IDTs (11a-11e) wherein, when the total numbers of the electrode fingers provided at the narrowly-pitched electrode finger sections in a first region (R1) and a fourth region (R4) are denoted respectively as Nx, and the total numbers of the electrode fingers provided at the narrowly-pitched electrode finger sections in a second region (R2) and a third region (R3) are denoted respectively as Ny, the average value of the cycles of the electrode fingers is set greater for the narrowly-pitched electrode finger sections in the regions with the greater total numbers between the total numbers Nx of the electrode fingers and the total numbers Ny of the electrode fingers than the narrowly-pitched electrode finger sections in the regions with the smaller total numbers, and cycles of the electrode fingers are set narrower for the IDT electrodes that are included in the regions with the greater total numbers out of the first, the third, and the fifth IDT electrodes (11a, 11c, 11e) than the IDT electrodes that are included in the regions with the smaller total numbers of electrode fingers, except at the parts where the narrowly-pitched electrode finger sections are provided.

The invention discloses a driving control circuit and method for optimizing switching characteristics of a power semiconductor device. The method comprises the following steps: acquiring a driving signal; selecting a preset selectable hierarchical driving voltage according to a hierarchical driving signal in the driving signals, and outputting a hierarchical driving voltage signal; and amplifyingthe graded driving voltage signal and sending the amplified graded driving voltage signal to a power semiconductor device. According to the drive control circuit and method for optimizing switching characteristics of a power semiconductor device, the driving control is taken as an entry point, the graded driving voltage is selected according to the graded driving signal, the graded driving voltagesignal is output and then sent to the power semiconductor device, so that the power semiconductor device makes a corresponding action response, the purpose of optimizing switching characteristics isachieved, and the design difficulty of driving protection is reduced.