372results about How to "Simple circuit" patented technology

A high speed modem is provided which targets the use of a selectable, desirable portion of the total available bandwidth of a channel for achieving a data rate which nevertheless far exceeds that of conventional voice-band modems. In a preferred embodiment, the invention is implemented in an Asymmetric Digital Subscriber Loop (ADSL), and the nominal data rate is achieved using an analog front end (AFE) with subband filtering which causes an upstream transceiver to use only a selected number of available sub-channels for downstream data transmission and allows slower sampling rate for the AFE. The data rate of the modem is increased in a multiplicative fashion through modular expansion of a bank of AFEs to increase the number of transmitted downstream sub-channels.

A high speed modem is provided which uses a selectable, desirable portion of the total available bandwidth of a transmission channel. In a preferred embodiment, the invention is incorporated in a dedicated hardware circuit which is connected on one end to a data processor and on the other end to an upstream transceiver through a channel supporting an Asymmetric Digital Subscriber Loop (ADSL) standard. The achievable target data rate of the modem is based on the capabilities of an analog front end (AFE) used in the modem, and a signal processor within the dedicated hardware. In particular, the modem AFE contains subband filtering which causes an upstream transceiver to use only a selected number of available sub-channels for downstream data transmission. The data rate of the modem is increased by upgrading the AFE or the signal processor in order to increase the number of processable transmitted downstream sub-channels.

A dual-band, dual-orthogonally-polarized antenna element includes a dielectric substrate having a conductor layer that includes a square ring slot and a shorted square ring, with each having a pair of orthogonal feed points. The shorted square ring is fed with coaxial probe feeds, while the square ring slot feeds striplines terminated in open-circuited stubs for coupling energy to each pair of orthogonal feed points. The first and second stripline feeds are not coplanar in order that each stub terminates past a center point of the element. The square ring slot operates as a high frequency band radiator and the shorted square ring operates as a low frequency band radiator, and both bands radiate substantially simultaneous dual-orthogonally-polarized modes. The modes can be any combination of dual-Circular Polarization (CP) and dual-Linear Polarization (LP), depending on the geometry of the radiators.

The invention relates to an online system for testing the essential resistance and the voltage of a single cell of a fuel cell stack, comprising a testing unit, a programmed AC driving source, a blocking condenser, an electric current detecting module, a keyboard, an LCD unit and a storage unit, which is characterized in that the programmed AC driving source is serially connected with the blocking condenser and then parallel connected with an output end of a fuel cell, and the testing unit is used for controlling the frequency and the amplitude value of the AC driving source periodically through a communication interface and collecting the voltage and the electric current signals of each single cell in order for computing essential resistance; the electric current detecting module, the keyboard, the LCD unit and the storage unit are respectively connected with the testing unit which communicates with a main controller of galvanic pile and other equipments through the communication interface. The invention has compact and legible circuit, high reliability, moderate cost, high measurement precision, quick measurement speed and ample and scalable interfaces, and the invention satisfies the requirements of the real-time and high-precision testing of the essential resistance and the voltage of the single cell of the fuel cell stack.

The invention discloses a Booth multiplier, which comprises a Booth coding circuit, a Booth decoding circuit, compressors and a carry save adder, wherein the Booth coding circuit is used for implementing Booth coding and coding a binary multiplying factor B to acquire signals X1, X2 and Neg; the Booth decoding circuit is used for combining the signals X1, X2 and Neg and a binary multiplicand A to generate partial product terms; the compressors are used for accumulating a plurality of partial product terms generated by the decoding circuit to acquire two accumulated values; and the carry save adder is used for implementing carry save adding operation on the two accumulated values acquired by accumulation of a plurality of partial product terms through the compressors to acquire a final product result. The operating rate is improved by adopting a hybrid Wallace-Tree structure and inserting a streamline. Compared with the prior art, the invention has the advantages that the Booth multiplier can achieve good effects on rate and area, and is low in energy consumption and accurate in calculation result at the same time.

An ultrasound probe which is capable of structurally improving resolution is provided. This ultrasound probe includes: an ultrasound probe which transmits ultrasound waves to a subject; and an optical probe which detects, with use of light, the ultrasound waves reflected off internal tissue of the subject, and openings of the ultrasound probe are larger than openings of the optical probe. With this, reflected waves (ultrasound waves) from the subject can be detected by the large openings, so that high resolution can be obtained relative to a width of the transmitted ultrasound waves.

An airbag ECU includes a communication bus connection circuit for connecting communication buses to communication circuits. A central control circuit connects some of the communication buses to the communication circuits with the communication bus connection circuit and sets addresses for some of slave sensor devices. When those addresses are set, the other communication buses are connected to the communication circuits by the communication bus connection circuit, and addresses for the other slave sensor devices are set. Thus, a circuit can be made simpler without any influence on address setting, thus reducing cost and size of an airbag apparatus.

The invention discloses a multipath LED constant current drive circuit suitable for a non-isolated converter, which comprises a DC/AC converting circuit, a current-equalizing transformer, rectifier filter circuits and LED loads. The multipath LED constant current drive circuit is characterized in that the DC/AC converting circuit converts the input direct voltage into alternating voltage, and the alternating voltage is input to the current-equalizing transformer; the current-equalizing transformer performs balancing control on each path of current; and after passing through each rectifier filter circuit, the current is output to each LED load respectively. The multipath LED constant current drive circuit has the advantages that: 1, the current-equalizing transformer realizes the equalization of a plurality of paths of LED load current, and the cost is low; 2, the current equalization control is realized by the current-equalizing transformer automatically without additional control circuits, and the circuit is simple and has high reliability; and 3, the current-equalizing transformer has a high efficiency to achieve the current equalization, and even the voltage difference of two paths of LEDs is large, the consumption for realizing the current equalization is small.

A position-posture sensing system of movable robot is composed of a photoelectric sensor for detecting the change of position and posture and converting the change to digital signals, an elastic pressing unit for ensuring the proper distance between said photoelectric sensor and ground, and a controlling-processing circuit consisting of a single-chip microprocessor, a communication interface chip, and the firmed programs. Its method is also disclosed.

The invention relates to startup and shutdown technology of electronic products, in particular to a startup and shutdown circuit. The startup and shutdown circuit comprises a startup and shutdown key, a system main control chip, a hard startup circuit, a soft shutdown circuit, a forced shutdown circuit and a system power supply, wherein the hard startup circuit, the soft shutdown circuit, the forced shutdown circuit and the system power supply are all formed by discrete components. The hard startup circuit, the soft shutdown circuit and the input end of the forced shutdown circuit are all connected with the startup and shutdown key. The output end of the hard startup circuit is connected with the system power supply, the output ends of the soft shutdown circuit and the forced shutdown circuit are connected with the system power supply through the hard startup circuit, and the soft shutdown circuit is further connected with the system main control chip. The startup and shutdown circuit is composed of all discrete components and is simple and low in standby power consumption and cost compared with startup and shutdown circuits controlled by an advanced reduced instruction set computer machine (ARM)/micro controller unit (MCU)/Super input/output (IO)/electronic computer (EC)/south bridge chip. Simultaneously the startup and shutdown circuit has high circuit reliability, can achieve a startup and shutdown control method same as that of x86 platform products (personal computer (PC) and Notebook) under the condition of non-x86 platform products, and increases a new user experience effect.

The invention discloses a burr detection device that consists of a double bounce inspection circuit and a reset control circuit; if the detected input signals have rising edge or descending edge, the double bounce edge inspection circuit outputs signals that have double bounce edge. The reset control circuit outputs a reset narrow pulse within each sample circle under the action of the clock edge so as to reset each sample circle of the double bounce edge inspection circuit and clean the locked signals that has rising and falling edge. Thus, the double bounce edge inspection circuit has rising edge and falling edge signals only in the sample circle to output signals that has double bounce that is the burr signals. The invention has direct indication for the burr inspection needless of comparing two types of sampling data; at the same time, the level status of the detected input signals does not need time to be inspected. Compared with prior art, the invention is needless of data comparing under the situation of delay, sampling or locking, the circuit is simple and is easy to be realized.

Systems and methods are provided that may be implemented to provide a power supply with automatic overcurrent protection (OCP) point calibration and/or current sense resistor (Rsense) verification. The provided systems and methods may implement auto-calibration techniques on the secondary side of a power supply to achieve a more precise OCP point than is possible with conventional adapter technology, and in one example may implement auto trimming for OCP voltage threshold value.

An acoustic wave switch includes a substrate with an acoustic wave cavity formed therein such that the mass per unit area of the acoustic cavity is greater than the mass per unit area of the substrate adjacent the cavity. A transducer is mounted on the acoustic cavity for generating an acoustic wave that is substantially trapped in the cavity. A touch on the touch surface of the acoustic wave cavity absorbs acoustic wave energy and produces a detectable change in the impedance of the transducer. The acoustic wave switch has a high Q so as to enable a touch to be detected by extremely simple, low-cost circuitry. The acoustic wave switch of the present invention is rugged, explosion proof, operates in the presence of liquids and other contaminants, has a low power consumption and can be incorporated and integrally formed in a wall of a housing for a device.

This method and device are used for the underwater cabins, e.g. dived sightseeing submarine to comm. and wreck alarm (CWA) with the commending ship or the dock control station. This underwater audio CWA device possesses simple circuit, compact structure, reliability, and efficiency. It saves energy, costs low and is easy to miniaturize. It adopts sideband CWA mode, co-uses the receiving modulating and emitting demodulating circuits. It not only builds an underwater audio comm. channel, but also offers a wreck alarm channel. The audio alarm signal offers position info for the searching and succoring ships. This system is also equipped with a recorder with a waterproof and stress-durable shell. This recorder records and stores all CWA audio info of whole process to offer an original info for the happened wreck analyzing. These meet the requirement of the effective safety measure submitted by the modern ship verification and raises the safety of the underwater tasks.

The invention relates to a digital pick-up device for body surface cardiac electric signals, and belongs to the field of medical appliances. The digital pick-up device adopts multiplexing and single-stage single-channel amplifier structures, and is a virtual instrument structure adopting a single-channel A/D convertor to realize synchronous acquisition of twelve-lead body surface cardiac electric signals. The instrument is provided with an isolating communication part and a detachable data storage device, and can meet corresponding medical electrical safety standard. The digital pick-up device has the advantages of small volume, low electric power consumption and low cost, is designed by taking EMC as reference, and is particularly suitable for popularization and application of families.

This invention discloses a 155M error analysis tester based on a site programmable gate array composed of a tested device, a clock data extraction and recover chip, a clock synthetic chip, a site programmable gate array chip, a single-chip processor, a liquid crystal display screen, a bit error pilot lamp, a film key board and a serial communication interface. The site programmable gate array includes a count module.

The invention discloses a water-curtain-type air humidifying and cooling device and a humidity control method thereof. The water-curtain-type air humidifying and cooling device is characterized by consisting of an automatic humidity control device, a water storage vessel, a multi-pipeline water-flow distribution unit, a water curtain and suspension parts of the water curtain, and the like. The humidity control method of the water-curtain-type air humidifying and cooling device is as follows: in a dry room or a relatively-closed air conditioner room, a flow rate per unit time of water in the water storage vessel, flowing onto the water curtain, is automatically controlled by the automatic humidity control device according to data such as the air humidity and the like inside the room, so that the water wets a given area on the water curtain and is naturally evaporated to control the evaporation amount of vapor on the water curtain so as to control the air humidity of the room and to lower the temperature; and the air humidity is automatically controlled within a set humidity range, so that the air-condition disease and discomfort of people because of dry air can be avoided.

The invention discloses a novel chaos source circuit based on quadratic-term nonlinear effect and a corresponding signal amplitude and polarity control method. The novel chaos source circuit is characterized by implementing output of a special chaos attractor by adopting a multiplying circuit consisting of three multipliers, an integration summing circuit consisting of seven resistors (including rheostats or potentiometers), three capacitors and three operational amplifiers, and an inverse-phase amplifying circuit consisting of four resistors and two operational amplifiers. The feedback intensity of product signals is partially and synchronously adjusted by the potentiometers, so that the partial and whole control on the amplitudes of output signals can be realized; and the polarities of linear feedback signals can be selectively controlled by switches, so that the polarity control on two paths of chaos signals can be realized. The partial amplitude control provided by the invention gives up the amplitude variation of a variable, and the polarity control only aims at two state variables. The novel chaos source circuit and the signal amplitude and polarity control method have the advantages of simple signal source circuit, special attractor, adjustable amplitude and controllable polarity, and can be widely applied to the fields of chaos radars, secret communication and the like.

The present invention discloses an electronic ballast, which comprises a rectifier-filter circuit and a high pressure trigger and also comprises a switch inverter and a control unit, the switch inverter converts the direct current outputted by the rectifier-filter circuit into the voltage and the current matched with the load electrical property, and changes the direct current into a middle frequency square wave signal and a low frequency square wave signal, to drive the load operation; the switch inverter comprises a full bridge inverter circuit or comprises a half bridge inverter circuit, the DC/DC and the DC/AC two-stage conversions are completed with the one-stage DC/AC conversion, to ensure that the circuit is simple; the control unit adopts a PWM control technology, two functions of the property matching and the inversion are realized, and a function of a soft switch is realized, to ensure that the efficiency is very high; the present invention is mainly suitable for a HID light, in particular to the control of the HID light, the present invention also can be applied in a pure resistance load, an inductive character load, a capacitive load and various application occasions that an output frequency is a middle frequency and a low frequency.

An improved passive pixel sensor (PPS) circuit comprising a correlated sampling circuit and method that integrates pixel charge leakage onto an integrating amplifier during sampling periods. An integrator circuit is provided for integrating PPS pixel charges received via a column line, and correlated sampling circuit is provided for the removal of kTC noise and dark integration. A multi-point sampling of the output of the integrator is provided wherein at least a first and second correlated sample are used to detect the charge integration from the column line leakages, and at least a third sample is used to detect the PPS signal after pixel readout. The correlated sampling method is employed to remove kTC noise and dark integration from the PPS signal.

The invention discloses an inverter outputting voltage testing circuit, which comprises a U, V, W three-phase outputting voltage end and a VU, VW voltage testing end which can realize the three-phase outputting voltage, and also comprises a first to a sixth dividing potential electric resistances (R11, R12, R13, R2, R31, R32), a first to a third filter capacitors (C11, C12, C13), and a first and a second voltage comparers (U1, U2), which are connected between the U, V, W three-phase outputting voltage end and the VU, VW voltage testing end. The invention minimizes number of megohm-grade electrodes to 2/3 of original number through promoting existing technique under a condition that current circuit performance can be affected, which lowers cost, simplifies three-phase outputting voltage differential testing circuit, decreases products volumes, lowers products cost, and simultaneously increases products competitive power.

The invention is the controlling system of the mixed dynamic electric automobile assembly. It transmits the speed signal of the cell of measuring the speed to the main controller whose controlling signal is transmitted to the accumulator through the drive module and the charger. The controlling signal of the main controller is transmitted to the charger through the temperature controller. The voltage, the electricity and the temperature signal of the accumulator is transmitted to the main controller through the detection model. The setting signal is transmitted to the main controller , the data signal end of the CAN outer bus connects with the main controller. The controlling signal of the main controller is transmitted to the transducer through the module of the numeral model .It transmits the frequency signal of the transducer to the electromotor. The controlling system of the dynamic dynamoelectric automobile assembly works according with the flow. The invention is provided with the easy circuit, the strong reliability, the high intelligent degree, the steady moving and the fast response.

The invention discloses a flat wire continuous wave staggered winding and a stator comprising the same and belongs to the technical field of motor manufacture. The flat wire continuous wave staggeredwinding is composed of a wire inlet end lead part (101), a wire outlet end lead part (102) and an S-shaped S wave line (103). The S-shaped wave line (103) includes an active side part (301), a straight line part (302) and an end part (303). The S-shaped wave line (103) is provided with a staggered winding part (304) in which the leads of different phases are arranged in a staggered manner. According to the invention, single three-phase control can be realized for motors or generators with different slot number of each phase and each electrode. Therefore, a motor circuit can be simplified and manufacture cost can be reduced. Secondary harmonics of the motor can be reduced, motor noise can be reduced and product quality can be improved.

The invention is concerned with the broad band microwave local-surge generator, it is: the vector-controlled oscillator creates low-voice high-frequency signal to the power divider, the phase-lock circuit, the loop filter in turn, then feedback to the vector-controlled oscillator in order to form the phase-lock loop signal source creating circuit that is the decimal fraction frequency division and reflecting-phase mixed-dispel suppression, the high-frequency signal creating by the circuit passes the frequency multiplier, the filter and the amplifier to get the signal source with different frequency that is needed by the microwave system. The invention can achieve the multi circuit local-surge creation on the veneer with lower cost.

The invention relates to an automotive anti-collision radar signal processing device, particularly relates to an automotive anti-collision radar signal processing device by use of 77GHz millimeter waves, and belongs to the technical field of communication and radar. The device comprises a radio frequency module, a power supply module, an FPGA (Field Programmable Gate Array) module, four groups ofreceiving circuits, two groups of transmission circuits, a clock and an RS232 interface module, wherein each group of receiving circuit consists of a front receiving amplification circuit, a receiving filter module, a rear receiving amplification circuit and an A/D (analog to digital) conversion module; and each group of transmission circuit consists of a D/A (digital to analog) conversion module, a transmission attenuation circuit and a transmission filter circuit. The device has the advantages of concise circuit, small occupied vehicular space, low cost and low power consumption; a signal processing board can be used for effectively amplifying and filtering a signal received by a radar antenna; and a high-performance low-noise filter chip is adopted in secondary amplification, so that high-frequency noise is effectively reduced, the accuracy of sampled data is guaranteed, and the dynamic range of signals is effectively improved.

The power supersonic transducer exciting circuit used in biomedicine engineering technology includes two signal generator circuits; gate circuit with first and second inputs connected to the outputs of the signal generator circuits, control end accepting the frequency selecting signal, the third input accepting signal from the protecting circuit and output connected to the input of the driver circuit; driver circuit with output connected to the signal input of serially resonant power amplifier circuit; serially resonant power amplifier circuit with feeding input connected to the voltage output of multiple-stage DC source to output protecting signal to the protecting circuit and signal output connected to the power supersonic transducer to excite it to send supersonic wave. The present invention has simple circuit, easy regulation, controllable output signal amplitude and duty ratio, high transmission efficiency and circuit safety.

The present invention provides a method of selecting antennas, devices and video glasses. The method includes: in a different time period, a first device receives a sounding signal sent by a second device on different channel groups, where each channel in each channel group is an antenna of the second device and the The first device performs channel estimation on each channel according to the sounding signal, and determines a channel parameter of each channel; and the first device determines, according to the channel parameter from The antenna of the second device and the antenna of the first device. Receiving sounding signals by time division and estimating channel parameters, selecting a working antenna according to these channel parameters can simplify the circuit of the transceiver of the communication device, save power resources and improve communication quality.

The invention discloses an LED backlight dimming system. The system comprises an MCU, an MMI module, a PWM dimming module, a selective analog switch and a current detection circuit, wherein the MCU is a microprocessor unit, and the MMI is a man-machine interface module. An LED backlight is provided with multiple LED lamps which are equally divided into N groups to form N string lights connected in series, N light emitting modules are formed based on the N string lights, and N is an integer larger than or equal to 2. The MCU outputs PWM pulse to the PWM dimming module, and the output end of the PWM dimming module is connected with a common IO end of the selective analog switch. The positive electrode ends of the N light emitting modules are connected with N channel branch IO ends of the selective analog switch respectively, and the negative electrode ends of the N light emitting modules are grounded through a measurement resistor Rx. The output end of a voltage detection module is connected with a data input port of the MCU. By the adoption of the LED backlight dimming system, stepless and constant-current dimming can be achieved, and reliability is high.

The invention discloses an LLC resonance power converter with double resonance frequencies. On the basis of the traditional LLC resonance power converter resonance network formed by two bridge arms and four NMOS transistors M3, M4, M5 and M6, a bridge arm formed by NMOS transistors M1 and M2 is additionally arranged, an active network is formed together with an inductor La, an isolation transformer and a Class D full bridge rectifier are serially connected sequentially, the Class D full bridge rectifier is sequentially connected with a sampling circuit, an error amplification circuit, an STM32F407 microcontroller and a high-frequency gate driving circuit via a load R, and output of the high-frequency gate driving circuit drives three bridge arms and six MOS transistors from M1 to M6 in the resonance network additionally provided with the active network to work normally. The LLC resonance power converter with double resonance frequencies has two working modes, the light-load efficiency of the LLC resonance converter is greatly improved, a switching frequency range is narrow, and symmetric work in a full load range is realized.

The invention provides a pseudo random number generation device and a method, wherein the device comprises a first linear feedback shift register (LFSR) and a second LFSR; the displacement directions of the first LFSR and the second LFSR are opposite; the first LFSR is used for generating a first register value with k bits in each clock cycle, and the second LFSR is used for generating a second register value with k bits in each clock cycle; and according to the displacement direction of the first LFSR, the first register value with k bits is respectively connected with the second register value with k bits in the direction opposite to the displacement direction of the second LFSR, and logic operation is respectively carried out to generate a random number with k bits. The pseudo random number generation device and the method remove the relativity of the register values in the LFSRs between the adjacent clock cycles, and generates random numbers which are independently and uniformly distributed with a very simple circuit.