5059 results about "Sampling circuits" patented technology

A multi-stage speech recognition system includes an audio transducer that detects a speech signal, and a sampling circuit that converts the transducer output into a digital speech signal. A spectral analysis circuit identifies a portion of the speech signal corresponding to a first class and a second class. The system includes memory storage or a database having a first and a second vocabulary list. A recognition circuit recognizes the first class based on the first vocabulary list to obtain a first recognition result. A matching circuit restricts a vocabulary list based on the first recognition result, and a recognizing circuit recognizes the second class based on the restricted vocabulary list, to obtain a second recognition result.

Architectures for imager arrays configured for use in array cameras in accordance with embodiments of the invention are described. One embodiment of the invention includes a plurality of focal planes, where each focal plane comprises a two dimensional arrangement of pixels having at least two pixels in each dimension and each focal plane is contained within a region of the imager array that does not contain pixels from another focal plane, control circuitry configured to control the capture of image information by the pixels within the focal planes, where the control circuitry is configured so that the capture of image information by the pixels in at least two of the focal planes is separately controllable, sampling circuitry configured to convert pixel outputs into digital pixel data, and output interface circuitry configured to transmit pixel data via an output interface.

A motor control system for a brushless and sensorless DC motor for driving a compressor, pump or other application, includes a protection and fault detection circuit for detecting a locked rotor and a rotor which has stopped because of lost rotor phase lock. The motor control system also includes an off-the-shelf motor control integrated circuit having an input for disabling power outputs to the motor phase coils. The protection and fault detection circuit uses a back EMF sampling circuit coupled to the motor phase coils and momentarily disables power to the motor phase coils, via the motor control integrated circuit input, to determine if the motor rotor is rotating. The system also monitors supply voltage, supply current, temperature, and motor speed limits to detect faults and protect system components.

An AC-to-DC voltage converter as power supply for lamp converts an AC input voltage to a constant DC voltage at predetermined value set by potentiometer. The converter includes input power supply 210, input protection circuit 201, EMI filter 202, rectifier 203, filter 204, converter 206, output filter 214, lamp 211, start circuit 208, control circuit 209, biasing circuit 212, sampling circuit 207, output protection circuit 200, feedback and dimming circuit 205 and input monitor circuit 213. This version is a flyback converter; versions from other topologies etc are also provided. The converter has feedback function that can regulate output voltage at predetermined value. The converter has dimming function and can adjust lamp brightness for conformability. The output constant brightness decreases peoples' eyes fatigue to minimum level.

The invention relates to a super capacitor energy storage type power quality compensator. A system structure comprises a compensation transformer, a series compensator, a parallel compensator, a super capacitor group, a current foldback circuit, a bidirectional DC/DC chopper circuit, a signal sampling circuit, a control circuit, a drive circuit, a human-computer interface and corresponding auxiliary circuits, which form a three-phase three-wire system topological structure. By utilizing the excellent characteristics of great power density, high charging and discharging speed and long cycle life of a super capacitor, the super capacitor energy storage type power quality compensator is matched with the DC/DC chopper circuit to form an energy storage control system which plays the roles of adjusting power and stabilizing the voltage of a direct current bus in work. The invention also has the functions of dynamic voltage recovery, active filter and reactive compensation and can ensure that a load can obtain rated sine voltage and the current of a grid is sine current with the same direction (unit power factor) with that of a voltage fundamental wave positive sequence active component, thereby comprehensively improving the quality of power. The invention has positive generalization and application value for both the public grid and users.

Array cameras incorporating quantum film imagers are disclosed. One embodiment includes: a plurality of focal planes, where each focal plane comprises a plurality of rows of pixels that also form a plurality of columns of pixels and each focal plane is contained within a region of the imager array that does not contain pixels from another focal plane; at least one quantum film located on the surface of the imager array, where each quantum film comprises a plurality of quantum dots; control circuitry configured to control the capture of image information by the pixels within the focal planes, where the control circuitry is configured so that the capture of image information by the pixels in at least two of the focal planes is separately controllable; and sampling circuitry configured to convert pixel outputs into digital pixel data.

A smart electricity meter with a function of monitoring and protecting power failure comprises a metering chip, a leakage current sampling circuit, a phase current sampling circuit, a phase voltage sampling circuit, a CPU (central processing unit), a power module and a low voltage breaker. The leakage current sampling circuit is electrically connected with the metering chip which is mutually electrically connected with the CPU. The CPU is electrically connected with the low voltage breaker through a trip output port. The low voltage breaker is electrically connected with the CPU through a status acquisition interface. The invention further provides a power failure monitoring and controlling method of the smart electricity meter. The smart electricity meter has the advantages that the reliable power module for power failure protection and control is provided, various types of power failure warning and protection are provided, failure warning and failure protection for voltage, current, power and the like are achieved for power users, failure spots are prevented and isolated, economic loss and personal safety accidents due to failure of electric circuit equipment of the users are prevented and reduced, and reliability of low voltage grids is effectively improved.

There is provided an imaging unit: including an image sensor with a number of pixels arranged in a matrix, the pixels having color pixels where color filters are disposed, and white pixels where the color filters are not disposed; a sampling circuit section for sampling pixel signals generated in the image sensor; and a main controller for controlling the image sensor and/or the sampling circuit section to sample the pixel signals generated in the white pixels or the pixel signals generated in the color pixels sequentially in a time-series manner.

A capacitive touch panel capable of reducing a disturbance noise and reducing touch detection time with a simple structure is obtained. The capacitive touch panel includes: a plurality of drive electrodes each to which a drive signal for touch detection is applied; a plurality of touch detection electrodes arranged to intersect the plurality of drive electrodes, and each outputting a detection signal synchronized with the drive signal; a first sampling circuit (A/D conversion circuits 72 and 73) extracting a first series of sampling signal including a signal component with first level and a noise component, from the detection signal; a second sampling circuit (A/D conversion circuits 75 and 76) extracting a second series of sampling signal including a signal component with second level different from the first level and the noise component, from the detection signal; a filter circuit (digital LPFs 81 and 82) performing a high range cut process on the first series of sampling signal and the second series of sampling signal; and a computation circuit (a subtraction circuit 90) determining a signal for touch detection based on an output of the filter circuit.

A device for detecting a demodulated signal received by a spread spectrum receiver and converted into digital samples. The device is characterized by a matched filter for calculating the correlation between an incoming signal and at least one reference signal, an oscillator for generating a sampling frequency, and a sampling circuit for re-sampling the demodulated digital sample signal at the sampling frequency, which is such that the timing of samples of the references signals of the matched filter corresponds to the timing of a sample signal going from the sampling circuit to the matched filter. The device also includes a multiplier in which the sample signal is multiplied by a carrier replica generated locally before the sampling circuit or thereafter, to remove the carrier from the sample signal.

A power converter used in the current control circuit and control method, consisting of a converter, a voltage divider circuit, a current sampling circuit, a first gain circuit, a differential amplifier, a second gain circuit, a multiplier, a saw tooth wave generator, a modulation comparator, and a driver. The invention samples inductor current through the current sampling circuit and generates the current sense signal, then processes again. With the differential amplifier, it compares the feedback voltage from the voltage divider circuit with the reference voltage, and the results along a modulation comparator output a drive signal to control the duty cycle in order to avoid the generation of inrush current. The present invention avoids inrush current caused by the large drive signal and achieves a good response rate and better system stability.

A high-speed data receiving circuit allowing correct and reliable data reception without the need for adjusting delays in circuits and interconnections is disclosed. A sampling circuit samples received data according to first, second, and third clock signals to produce first, second, and third streams of data. The first, second, and third clock signals sequentially have a predetermined phase difference between adjacent ones. A clock generator generates the first, second, and third clock signals having phases determined depending on a clock selection signal obtained by comparing the first, second, and third streams of data. The second clock signal is selected as an output clock signal and the second stream of data corresponding to said second clock signal is selected as an output data of the high-speed data receiving circuit.

A bandpass SIGMADELTA ADC utilizing either a single-loop or a MASH architecture wherein the resonators are implemented as either a delay cell resonator, a delay cell based resonator, a Forward-Euler resonator, a two-path interleaved resonator, or a four-path interleaved resonator. The resonator can be synthesized with analog circuit techniques such as active-RC, gm-C, MOSFET-C, switched capacitor, or switched current. The switched capacitor or switched current circuits can be designed using single-sampling, double-sampling, or multi-sampling circuits. The non-stringent requirement of a SIGMADELTA ADC using switched capacitor circuits allows the ADC to be implemented in a CMOS process to minimize cost and reduce power consumption. Double-sampling circuits provide improved matching and improved tolerance to sampling clock jitter. In particular, a bandpass MASH 4-4 SIGMADELTA ADC provides a simulated signal-to-noise ratio of 85 dB at an oversampling ratio of 32 for a CDMA application. The bandpass SIGMADELTA ADC can also be used in conjunction with undersampling to provide a frequency downconversion.

The present invention provides apparatuses and computer readable media for obtaining information about a heating, ventilating, and air conditioning (HVAC) system and sending the information to a remote networked device. A control circuit deactivates loads of a HVAC system so that a sampling circuit can inject a test signal into the loads. Based on a resulting signal, a processor determines what loads are connected to a thermostat. The processor can consequently determine the type of the HVAC system. The processor may further utilize a lookup table that maps possible values of the resulting signal with different types of HVAC systems. The thermostat may consequently send information about the load configuration to a networked device. The thermostat may further detect a change of the load configuration and notify the networked device and may periodically inject the test signal into the connected loads when the control relays are deactivated.

A data acquisition system includes a charge-sensitive amplifier (CSA) configured to receive a charge from an x-ray detector, the CSA includes a high-gain electronic voltage amplifier, an electrical energy storage device coupled with the amplifier, and an electrical resistor coupled with the amplifier. The data acquisition system includes a baseline sampling circuit configured to receive an output from the CSA and to sample a baseline signal from the CSA, at least one discriminator coupled to an output of the CSA and to an output of the baseline sampling circuit, the at least one discriminator configured to output a voltage if the output of the CSA exceeds a threshold, and a counter coupled to an output of the discriminator and configured to output a digital signal indicative of a photon count received at the x-ray detector and based on the output from the CSA and on the signal from the CSA.

A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.

An apparatus and method for detecting objects buried beneath the surface of a medium. A plurality of wide-bandwidth antennas, coupled to form an array, is drawn across the surface. Each antenna radiates a plurality of pulses of electromagnetic radiation at periodic intervals of time and receives the plurality of pulses after their interaction with the medium. The return pulses are sampled by a sampling circuit disposed at the feed of each antenna so as to create an equivalent-time pulse signal, and a self-signature of each antenna is subtracted from the equivalent-time pulse signal so as to detect features of objects buried beneath the surface of the medium. A pulse former is provided at the feedpoint of the receiving antenna.

The invention relates to an alternate current/direct current (AC/DC) energy converter, and aims to provide a high-efficiency AC/DC combined convertor with a wide output voltage range. The convertor of the invention comprises a filter, a rectifier bridge B1, a Buck PFC circuit, an uncontrollable DC/DC circuit, an output filter capacitor Co and a parallel AC/DC circuit, wherein the filter is connected with the rectifier bridge B1; a control terminal of a switching tube S1 in the Buck PFC circuit is connected with the output of a Buck PFC control circuit; the Buck PFC control circuit is connected with the output of a feedback control circuit; the feedback control circuit comprises an error amplifier and a signal isolating circuit; and the output side of the output filter capacitor Co is sequentially connected with an output signal sampling circuit, the error amplifier and the signal isolating circuit. The invention acquires high efficiency and high power factors when isolation and the wide output voltage range are realized, improves the efficiency of the AC/DC convertor connected with the Buck PFC circuit in parallel, can solve the problem of too high starting up surge current of a boost power-factor correction (Boost) circuit, and does not need a surge current suppressing circuit, thus improving the efficiency.

The invention provides a measuring device and method for the target line-of-sight angel offset and distance. The device is composed of a four-quadrant avalanche photodetector, a receiving and sending optical unit, a noise compensation circuit, a four-circuit front amplification circuit, a video amplification circuit, an automatic gain amplification circuit, a peak keeping circuit, an AD conversion circuit, a laser, a dominant wave sampling circuit, a summing circuit, a time identifying circuit, a time test circuit and a digital processing circuit, wherein the receiving and sending optical unit enables narrow pulse laser rays emitted by the laser to be converged on the photoelectric detector to form echo light spots after target reflection, photovoltaic conversion of the four-quadrant avalanche photodetector, front amplification, video amplification and automatic gain amplification are conducted, narrow-pulse peak keeping is conducted, transmission of the AD conversion circuit is conducted, and the digital processing circuit extracts the digital line-of-sight angel offset; summing is conducted on the four-circuit front amplification circuit, the dominant wave sampling circuit is combined, the time identifying circuit determines laser emitting and echo coming and returning time, the time is transmitted to the time identifying circuit to be measured, and the digital processing circuit decodes the corresponding distance.

The invention discloses a switch voltage regulation circuit and method with a frequency limiting function, achieving the function of improving the electromagnetic interference distribution and improving the efficiency by limiting the switch frequency. The circuit comprises an energy storage element capable of storing energy; a switch electrically coupled to the energy storage element and used forbeing conducted to enable the energy storage element to store energy and being cut off to transmit the energy stored in the energy storage element to a load; a current sampling circuit electrically connected to the switch and used for sampling current flowing by the switch and generating a current sampling signal representative of the current flowing by the switch; a voltage feedback circuit for sampling an output voltage of the switch voltage regulation circuit and generating a feedback signal related to the output voltage of the switch voltage regulation circuit; a control circuit for controlling the conduction and cutting-off of the switch according to the current sampling signal and the feedback signal; and a frequency limiting circuit electrically coupled to the control circuit and used for limiting the frequency at which the switch is conducted and cut off.

The invention discloses a switching power supply for an AC/DC-DC self-adaptive instrument within an ultra-wide voltage input range. The switching power supply comprises an input protective circuit, an EMI filter circuit, a power frequency rectification and filter circuit, a high frequency rectification and filter circuit, a boosting conversion circuit, a flyback conversion circuit, a first voltage sampling circuit, a first current sampling circuit, a second voltage sampling circuit, a second current sampling circuit, a first PWM circuit, a second PWM circuit, an auxiliary power supply circuit, a power switching circuit, a voltage detection and comparison control circuit and an optocoupler isolation feedback circuit. A two-stage type cascade circuit is formed by the boosting conversion circuit and the flyback conversion circuit, and the automatic instrument can automatically adapt to power supply of an 85-265V alternating-current power supply and an 18-100V direct-current power supply.

A solid-state imaging device comprises: a plurality of pixels including a light-sensitive portion (2) for photoelectrically converting incident light, a transfer gate (10) for transferring a charge stored in the light-sensitive portion, a resettable detection capacitor (18) for storing the charge transferred from the transfer gate, and a selection switch (26) for outputting a charge of the detection capacitor according to a selection signal RWn; a charge amplifier (41) for converting the detection capacitor charge, which is outputted from the pixels, to a voltage; and a correlated double sampling circuit (86) for obtaining a voltage difference between a reset level and a detected level converted by the charge amplifier. According to the above device, a thermal noise is eliminated due to the correlated double sampling circuit. Further, a fixed pattern noise is not generated due to the pixel circuit structure.

An overcurrent detection circuit for a power switch comprises a sampling circuit and a comparing circuit. The sampling circuit is configured to perform current sampling on the power switch using a sampling Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and an amplifier, convert a sample current into a sample voltage and transmit the sample voltage to the comparing circuit, and clamp operating voltages of the comparing circuit and of an output circuit of the amplifier by a serially connected clamping MOSFET. The comparing circuit is configured to compare the sample voltage with a reference voltage and to output a result of overcurrent detection.

The invention relates to a sub-module circuit board used for a dynamic simulation test for simulating a high-capacity multi-level modular converter (MMC). A digital controller on the circuit board is used for controlling a plurality of MMC sub-modules of which parameters are reduced according to an exponential method, the sub-modules are connected in series. Each MMC sub-module comprises a main circuit an insulated gate bipolar transistor (IGBT) and silicon controlled rectifier driving circuit, a capacitance and voltage sampling circuit, a circuit board isolation power supply, a control and coding-decoding chip shared by a plurality of sub-modules, and a fiber channel, wherein the main circuit a capacitor, two IGBTs which are connected vertically in series and connected with the capacitor in parallel, a bypass switch connected with the lower IGBT in parallel, and a silicon controlled rectifier which is used for protecting the IGBTs and the capacitor and connected with the lower IGBT.

A switching power supply controller which includes at least one switching element, and controls a switching cycle during which the switching elements are switched on and off to regulate the power supply's output voltage. The controller has a feedback signal which represents the output voltage, and a circuit node which conducts a current that is higher during a second portion of the switching cycle than it is during a first portion, such that the feedback signal varies with the current conducted by the node. To overcome feedback signal inaccuracies, a sampling circuit samples a signal which varies with the feedback signal only during the first portion of the switching cycle; the controller then regulates the output voltage in response to the sampled signal. The sampling circuit may be further arranged to produce an output which approximates the portion of the feedback signal waveform which is not sampled.

A light-adjusting and current-limiting control circuit for a lamp includes a sampling circuit formed of a manganese-copper line or a current transformer, a power circuit provided with resistors, capacitors, diodes, a Varistor and a zener diode, a signal adjusting circuit composed of diodes, resistors, a varistor, triacs and capacitors, and a control output circuit having a thyristor, diodes, a relay and an LED. The control output circuit can be replaced with a light-adjusting input circuit, a chip processor control circuit, a zero-crossing detection circuit and a two-way silicon controlled rectifier control output circuit 5. Thus, the invention has a low cost, a small size and an excellent precision, compared to conventional ones.

The invention relates to a device for rapidly detecting the short-circuit fault of a power system, which comprises a power supply circuit, an A/D sampling circuit, a voltage/current detection circuit, a digital signal processing signal and a protective signal output circuit, wherein the power supply circuit converts 220V alternating current into direct current for ensuring normal running of the entire device; voltages and currents in a power grid are transformed by an external transformer and then fed into the voltage/current detection circuit, voltage/current signals are formed by means of the regulation and setting of the voltage/current detection circuit, then converted by the A/D sampling circuit from analog quantity to digital quantity and at last output to the digital signal processing signal, the digital signal processing signal judges whether the short-circuit fault occurs, and if so, the digital signal processing signal controls the protective signal output circuit to send a protective signal. The device can judge the short-circuit fault according to the voltage/current signals at ports of each breaker only, and the detection time of the device is in general less than 5ms; and the device can facilitate expanding and updating power grid and reforming network.

The invention provides a leakage detecting protection circuit capable of periodically automatically detecting function integrity. The leakage detecting protection circuit comprises a main loop switch, a resetting button, a tripping coil, a silicon controlled rectifier, an induction coil for detecting leakage current, a self-induction coil for detecting a low-resistance failure and a control chip which drives the switching-on/off of the silicon controlled rectifier by a leakage current detection result, and further comprises a) a timer for periodically outputting a function integrity detection signal, b) a detection signal latching circuit, c) an analogue test switch for generating analogue leakage current, d) a delay output circuit and e) a sampling circuit, wherein the timer outputs the detection signal to the latching circuit and the delay output circuit; and if a function is detected to fail, the delay output circuit outputs a tripping signal to switch the silicon controlled rectifier on, and the main loop switch is switched off. The leakage detecting protection circuit has the main advantages of periodically automatically detecting whether the leakage protection function of the circuit is integral or not without annual testing and avoiding tripping within the service life of the circuit, along with more convenience of use.

The invention relates to a photovoltaic high-frequency isolation boost soft switch DC/DC converter and a control method thereof, which is used for solving the problems of difficult current conversion of leading leg in idle load or light load and low efficiency in full load, improving the efficiency of the converter and realizing full-power converter. The photovoltaic high-frequency isolation boost soft switch DC/DC converter comprises a high-frequency transformer, wherein the primary side of the high-frequency transformer is provided with a phase shift PWM (pulse-width modulation) control converter; the high-frequency transformer is provided with three secondary sides; two secondary sides are formed by connecting bridge type diode rectification circuits in series for outputting high voltages, the output ends of the secondary sides are connected with output voltage and current sampling circuits, and the output voltage and current sampling circuits are connected with a controller; the third secondary side is formed by connecting a voltage dropping winding with a current converting inductor and a switch in series; the primary side of the transformer is provided with a blocking capacitor Cb and a saturation inductor LS which are connected in series; output filtering capacitors Lfl and Lf2 are coupling capacitors and share one magnetic core; output ends Df1-R1-Cf1 and Df2-R2-Cf2 form a crossed clamping buffer circuit; and the asymmetrical phase shift PWM controller controls power switching devices VT1 to VT4 and a switch K0.

The invention relates to a light-gathering wind and light complementary power station with an automatic sun tracking function and a maximum power point tracking function, which comprises a light-gathering device, a photovoltaic cell array device, a tracking driving device, a photovoltaic controller with a maximum power point tracking function, and a wind generating set, wherein the light-gathering device and the photovoltaic cell array device comprise a frame consisting of a Fresnel lens light-gathering device array and a photovoltaic cell array respectively; the tracking driving device comprises an intelligent control system for driving the light-gathering device and the photovoltaic cell array device to move in a sun-tracking manner, and a mechanical control and transmission device; the photovoltaic controller with the maximum power point tracking function consists of a voltage sampling circuit, a current sampling circuit and a microprocessor in which a multiplier and a comparator are arranged; and the wind generating set consists of a wind-driven generator and a wind turbine controller. The light-gathering wind and light complementary power station has high automation degree, light weight and high photoelectric conversion efficiency. By adopting the photovoltaic controller with the maximum power point tracking function, the investment cost of photoelectric power generation can be greatly lowered, and the power generating efficiency is greatly increased.