163 results about "Chopper" patented technology

The invention relates to the technical field of robot intelligent actuators, and discloses a magneto-rheological end effector accurate grasping system based on force feedback, which comprises a multi-curved-surface bionic fingertip formed by a magneto-rheological elastomer, and a three-dimensional distributed excitation coil array is embedded in the fingertip. The coil array is excited by a high-frequency chopping constant-current driving module to generate a space gradient magnetic field, and the magnetic field changes the shear modulus of the elastomer within millisecond-level time, so that the fingertip surface hardness jumps in real time along with a control instruction; and the force feedback closed-loop control unit comprises an ultrathin film strain sensing net attached to the inner curved surface of the fingertip. Through time-sharing switching of a negative pressure micropore adsorption layer and a magneto-rheological rigidity keeping mode, traditional adsorption and rigid clamping are changed into a pre-fixing and rigidity gradual change two-section type process, instantaneous force impact during adsorption release is eliminated, meanwhile, thin film wrinkling caused by continuous negative pressure is avoided, and it is ensured that an ultrathin and high-added-value workpiece is kept flat and traceless in the whole transfer process.

The invention provides a zero-voltage ride-through control method for a self-synchronizing voltage source doubly-fed wind turbine generator, which comprises the following steps that: when the self-synchronizing voltage source doubly-fed wind turbine generator is in a transient state, a grid-side converter adopts vector control, and a rotor-side converter adopts additional virtual impedance and annular current limiting; the transient overcurrent of the grid-side converter and the rotor-side converter can be effectively suppressed, so that the continuous operation capability of the wind turbine generator in the zero-voltage ride-through period can be maintained; meanwhile, by improving the transient capacity and the transient reactive current amplitude of the converter, the transient voltage supporting capacity of the wind turbine generator during the zero voltage ride-through period can be effectively provided; when the self-synchronizing voltage source doubly-fed wind turbine generator set is in a transient state, overvoltage of direct-current bus voltage is limited by a Chopper circuit, active-priority current amplitude limiting control is adopted by a grid-side converter, parameters of a current inner ring PI controller of a rotor-side converter are optimized, energy balance of a direct-current side can be achieved in the zero-voltage ride-through period, and stability of the direct-current bus voltage is maintained.

A locomotive has DC or AC traction motors, powered by a hydrogen fuel cell, and optionally other sources such as regenerative braking. The traction motors of the locomotive may be connected to a set of independent DC choppers or AC inverters, linked via a common DC bus, configured to regulate power from the one or more power sources. A manager module, among other functions, may receive inputs and signals to coordinate delivery of electricity from the sources to the motor. A method for retrofitting a legacy locomotive may include removing a generator and a control apparatus configured for diesel fuel, and installing a kit of apparatus configured to be powered by a hydrogen fuel cell. A railway system for use by locomotives powered by hydrogen has one or more hydrogen-generation stations deployed near a track of the railway system.

A signal processing device and a signal transceiver device are provided. The signal processing device includes a first amplifier, two first choppers, a second chopper, and a third chopper. The first amplifier is configured to generate a second signal from a first signal. The two first choppers are embedded between an input and an output of the first amplifier and are configured to perform a first frequency shift and a first frequency shift back, respectively. The second chopper is coupled to the input of the first amplifier and is configured to perform a second frequency shift. The third chopper is coupled to the output of the first amplifier and is configured to perform a second frequency shift back. The first frequency and the second frequency are different.

The utility model provides a drive circuit with chopping and current limiting functions and a stage lamp, comprising an ILIMIT pin, an external pull-down resistor arranged on the ILIMIT pin; the output end of the H bridge is connected with a load; the first input end of the control logic circuit is connected with the ILIMIT pin, and the driving output end of the control logic circuit is connected with the H bridge; the control logic circuit comprises a calculation circuit, a current detection circuit, a comparison circuit and a chopper circuit, the ILIMIT pin serves as the input end of the calculation circuit, the input end of the comparison circuit is connected with the output end of the calculation circuit and the output end of the current detection circuit, and the input end of the chopper circuit is connected with the output end of the comparison circuit and the output end of the current detection circuit. The driving circuit provided by the utility model has a current chopping and current limiting function so as to prevent the output current of the H bridge from infinitely increasing, and surge current can be effectively limited without damaging a chip and a load during the starting or transient period of the load.

This invention discloses a liquid crystal filter-based lidar chopping device for atmospheric wind and temperature detection, comprising a digitally controlled voltage output module, a liquid crystal module, a light guide module, a timing control module, a polarization beam splitter module, a frequency discriminator module, a reference channel photodetector, a frequency discriminator channel photodetector, a photon counting and acquisition card, a computer, a pulsed laser, a telescope, and a collimation module. This invention also discloses a liquid crystal filter-based lidar chopping method for atmospheric wind and temperature detection. This invention solves the problem of atmospheric wind and temperature detection being limited by the dynamic range of the photodetector; the received signal attenuation amplitude can be adaptively adjusted in real time, better adapting to weather changes. Furthermore, although liquid crystal filtering introduces some signal loss, wind and temperature detection typically uses the ratio of the reference channel and frequency discriminator channel signals for inversion, so the final result is independent of the liquid crystal's transmittance, thus avoiding the negative impact of liquid crystal filtering.

This invention discloses a bandgap reference circuit structure, belonging to the field of integrated circuit design technology. The circuit structure includes a bandgap reference core circuit, a chopper-equipped operational amplifier (op-amp), a bandgap reference startup circuit, a temperature-to-absolute-temperature (PTAT) bias current source, and a current source startup circuit. By optimizing the bandgap reference core circuit architecture, combining chopper technology to eliminate the effects of offset voltage and device mismatch, and with the matching startup circuit and low-voltage-adaptive bias current source, the reference voltage is essentially independent of the op-amp input offset voltage, improving circuit symmetry performance and load dynamic response speed. Furthermore, in most common complementary metal-oxide-semiconductor (CMOS) processes, it only requires a power supply voltage of 2V or higher to operate stably, significantly improving the accuracy and stability of the reference voltage.

The invention provides an LED dimming constant-voltage power supply self-adaptive to load voltage and an overload protection method thereof, and the power supply comprises a main control circuit which is used for outputting a first reference voltage signal to enable a controlled voltage conversion circuit to be maximum voltage output, and outputting a PWM dimming signal to drive a first transistor through a chopper circuit. And outputting a switching signal to initiate voltage detection of the load; the self-detection circuit comprises a constant current source circuit and a first operational circuit, and the constant current source circuit is connected with a load to form a constant current power supply loop; the first operational circuit is used for measuring load voltage and outputting a voltage sampling signal to the main control circuit; the master control circuit outputs a second reference voltage signal to the controlled voltage conversion circuit according to the voltage sampling signal so that the controlled voltage conversion circuit can be adjusted to load voltage output. According to the invention, load voltage detection and load power supply voltage adjustment are realized by controlling the self-detection circuit, and overload protection under different output voltages is realized through the overload protection circuit.

To provide an amplifier in which intermodulation distortion is reduced.SOLUTION: The auto-zero amplifier circuit 2122 includes a transconductance amplifier 211221 and sampling capacitors CM1 and CM2. A modulation chopper circuit 31,32 modulates an input signal and inputs the modulated signal to a mutual conductance amplifier 211,221. The auto-zero switch circuit 41 includes auto-zero switches S31 and S32, and the auto-zero switch circuit 42 includes auto-zero switches S33 and S34. One end of the dummy switch Sd1 is connected between the input-terminal INM and the connection point of the auto-zero switches S31 and S32. One end of the dummy switch Sd2 is connected between the input-terminal INP and the connection point of the auto-zero switches S33 and S34. A capacitor C4 is connected between the other ends of the dummy switches Sd1, Sd2 and a ground line.SELECTED DRAWING: Figure 1

This invention relates to the field of lighting control technology, specifically disclosing an environment-adaptive LED constant current energy-saving control method. The method includes: arranging a dielectric-photoelastic sensing array, a magnetostrictive-leakage flux detection coil, and a broadband impedance spectrum detection unit on the phosphor encapsulation layer, the inductor core, and the output bus, respectively; simultaneously acquiring three types of timing signals; extracting dielectric-magnetic-electric coupling degradation feature vectors; inputting the feature vectors into an energy-saving-lifetime co-optimization model; correcting the target luminous flux based on the dielectric relaxation offset; constructing a core loss-efficiency mapping surface to solve for the minimum energy consumption operating point; generating a constant current target value offset sequence and a PWM chopper phase-frequency co-transfer strategy; and simultaneously adjusting the duty cycle, switching frequency, and gate impedance through a feedforward-feedback composite adjustment network, and feeding back the current ripple spectrum and dielectric relaxation offset to update the feature vector weights. This invention achieves multi-physics field co-sensing and energy-saving-lifetime co-optimization.

The class AB amplifier device includes an input chopper switch circuit that performs a chopping operation in synchronization with a first and second chopper clock signal, and outputs first and second modulated signals obtained by modulating the first and second differential input signals to a first and second node; an input amplifier circuit that receives the first and second modulated signals via the first and second nodes, and outputs a differential amplified signal obtained by amplifying the first and second modulated signals; an output chopper switch circuit that receives the differential amplified signal, performs a chopping operation in synchronization with the first and second chopper clock signals, and modulates the differential amplified signal to output a demodulated signal demodulated to the frequency band of the first and second differential input signals; and an output amplifier circuit that outputs a first output signal obtained by amplifying the demodulated signal.

The invention provides a chopper unit and a wind generating set, and relates to the technical field of frequency converter equipment. Through the modular design, the structure is compact, two chopper outputs can be achieved through one structure, installation and maintenance are convenient, and the working efficiency is improved. The chopper unit and the wind generating set comprise a cabinet body, a radiator and a power module, wherein the cabinet body is provided with an accommodating cavity; the radiator is arranged in the accommodating cavity and is used for horizontally dividing the accommodating cavity into a first accommodating space and a second accommodating space; the power modules are arranged in the first accommodating space and the second accommodating space, each power module comprises a plurality of power elements, and the plurality of power elements are arranged in the vertical direction. The chopper unit and the wind generating set are used for expanding the power element.

The invention relates to the technical field of semiconductor packaging equipment, and discloses an automatic threading mechanism of a semiconductor packaging wire bonder, which comprises an operation table, a coiling assembly driven by a motor is arranged on one side of the top of the operation table, a wire bonding head is movably arranged on one side of the operation table, and one side of the wire bonding head is fixedly connected with a chopper through a connecting seat. The top of the chopper fixedly penetrates through the middle of the connecting seat, the top of the connecting seat is fixedly connected with a connecting cylinder, and the top of the connecting cylinder is provided with a wire clamping assembly. By arranging the wire clamping assembly, the cleaning mechanism and the wire inlet cylinder, surface cleaning is completed while a gold wire automatically and straightly penetrates into the chopper, and the wire welding precision, reliability and packaging efficiency are effectively improved.

The application discloses a control method for high-voltage ride-through of an energy storage power station, and according to the different degrees of fault and working states, three control methods in three states are given, namely, under normal working conditions, the DC chopper does not act, and the energy storage PCS system outputs a given value of reactive current; under a light degree of fault, the DC chopper acts, and the energy storage PCS system outputs a given value of reactive current; and under a deep degree of fault, a dynamic reactive power compensation device is put into use, the DC chopper acts, and the energy storage PCS system outputs a given value of reactive current. The method can judge the degrees and states of high-voltage faults of a power grid by detecting the voltage of a grid-connected point of the energy storage power station, switches different control modes, protects the PCS converter part of the energy storage power station, and keeps the energy storage power station from being disconnected from the power grid within a certain time when the high-voltage fault occurs.

This power conversion device comprises: a chopper that has a switching element, and bidirectionally converts a battery voltage and a DC link voltage using the switching element; an inverter that bidirectionally converts the DC link voltage and an AC voltage; and a control device that controls the inverter and the chopper. The control device can select, as an operating mode for controlling the chopper, one of a first mode in which the DC link voltage is controlled in accordance with a voltage command value by turning on / off the switching element, and a second mode in which the switching element is always in an on state. The control device reduces the voltage command value when the operating mode is shifted from the first mode to the second mode.

The invention relates to a control system, which is composed of a main controller electrically connected to an AC chopper wall-controller, enabling users to control the AC chopper wall-controller by pressing, and the AC chopper wall-controller fully utilizes the principle of AC electricity and combining it with the characteristics of AC zero-crossing circuit, the main controller that controls an electrical appliance is capable of easily identifying signals, and at the same time, signals of the main controller will not be interfered due to a short power outage, thus capable of working stably.

This invention discloses a Sigma-Delta analog-to-digital converter (ADC) with aliasing suppression function. The Sigma-Delta ADC includes a preset loop filter module, a sampling module, a quantizer, and a preset feedback DAC module. The preset loop filter module, sampling module, and quantizer are connected in series. The preset loop filter module includes a chopper. The preset feedback DAC module is connected between the loop filter module and the quantizer to suppress aliasing introduced by the chopper and maintain the effective signal sampled by the sampling module within the corresponding frequency band. All poles of the transfer function of the preset feedback DAC module are located at the aliasing points introduced by the chopper, thus achieving the function of suppressing aliasing.

The application discloses a chopper AC to AC voltage converter, which comprises an AC input module, an input voltage detection circuit, a chopper switch module, a driving circuit, an AC output module, a control circuit and a power supply circuit, wherein the chopper switch module comprises a first switch tube and a second switch tube which are oppositely connected, and the chopper switch module is connected to the control circuit and the power supply circuit through the driving circuit. The first switch tube and the second switch tube are oppositely combined into a switch circuit to replace a thyristor, the first switch tube and the second switch tube are opened to output when the mains voltage is lower than a peak value of 200V, the first switch tube and the second switch tube are closed when the mains voltage is higher than the peak value of 200V, and the first switch tube and the second switch tube are opened again when the mains voltage is lower than the peak value of 200V, so that the output voltage is always lower than the peak value of 200V through the above-mentioned process, and the user's electronic and electrical products are prevented from being burnt due to the excessively high peak voltage.

The utility model provides a high-frequency chopping output control circuit for an electronic cigarette, which is characterized in that the output end of a charging circuit is in charging connection with a power supply, and the output end of the power supply is in power supply connection with an electronic cigarette gradual wave output main control circuit and a tobacco tar atomization control circuit; the output end of the microphone switch is connected with the input end of the electronic cigarette gradual wave output main control circuit, the output end of the electronic cigarette gradual wave output main control circuit is connected with the input end of the tobacco tar atomization control circuit, and the output end of the tobacco tar atomization control circuit is in power supply connection with an atomizer in an electronic cigarette cartridge. The output end of the electronic cigarette gradual wave output main control circuit is further connected with a display screen, and a main control chip U2 capable of outputting gradual wave control signals is arranged in the electronic cigarette gradual wave output main control circuit. The beneficial effects of the utility model are that the chopping output frequency of the main control chip U2 exceeding 20KHz does not make the main control circuit board vibrate to generate noise which can be heard by human ears.

The utility model provides a high-bandwidth Hall current sensor chip and a circuit structure thereof. The circuit structure comprises a first Hall element and a second Hall element which are used for sensing a detection current and generating a differential voltage signal; the three-stage low-frequency amplification chopping module is used for carrying out high-precision amplification and ripple and offset elimination on the differential signals and comprises a high-bandwidth fully-differential amplifier input stage and a high-bandwidth fully-differential amplifier output stage, and the high-bandwidth fully-differential amplifier input stage comprises two operational amplifiers; the comparator is used for comparing the amplified signal output by the three-stage low-frequency amplifying and chopping module with a reference signal to generate a final output signal; and the programmer is used for adjusting the output sensitivity and / or the static output voltage. According to the high-bandwidth current sensor, a dual-channel signal transmission structure and a three-stage low-frequency amplification chopping module are adopted, high bandwidth can be achieved, the ever-increasing frequency requirement is met, the compromise between residual offset and residual ripple amplitude is solved, and quick response of the high-bandwidth current sensor can be achieved.

The invention relates to the technical field of intelligent equipment control, in particular to a chopping and phase cutting integrated dimming fan lamp remote control and wall control integrated system which comprises an integrated controller, a wall-mounted control panel and a wireless remote controller. The integrated controller integrates a micro control unit (MCU), a chopping dimming driving circuit and a phase cutting speed regulation driving circuit, and the MCU executes a mixed dimming control algorithm and can dynamically select a mode of chopping for a lamp or a mode of phase cutting for a fan according to load characteristics to carry out optimal control. According to the system, the real-time synchronization of the states of the wall control terminal and the remote control terminal is realized through a two-way communication protocol, and unified seamless user experience is provided. In addition, various intelligent algorithms such as brightness smooth transition, fan speed self-adaptive steady speed, dynamic power optimization and locked-rotor protection are built in the system, and the comfort, stability and safety of dimming and speed regulation are remarkably improved. According to the invention, the control experience of high performance, high reliability and humanized operation is realized.

A bidirectional DC-DC power converter capable of both step-up and step-down conversion and a control method thereof. The converter comprises a bidirectional DC-DC resonant converter and a control unit. The control unit generates a plurality of control signals for controlling the resonant converter, such that the resonant converter can operate in a plurality of different conversion modes according to the control signals to achieve bidirectional step-up and step-down conversion between the two sides of the resonant converter. In particular, when the resonant converter converts the input voltage received by a second full-bridge chopper circuit to the output of a first full-bridge chopper circuit via an LLC resonant circuit while the control frequency of the second full-bridge chopper circuit is lower than the resonant frequency on the input side, the control of the first full-bridge chopper circuit is increased when the LLC resonant circuit reaches resonance, so that the output side can output a higher output voltage.

A drive tracking system including a heliostat structure, a power electronic converter, and a tracking controller. The heliostat structure includes a heliostat support frame, a plurality of linear actuators, and a heliostat facet. A first end of each of the plurality of linear actuators is connected to an underside of the heliostat facet and a second end of each of the plurality of linear actuators is connected to the heliostat support frame. The power electronic converter includes a plurality of direct current (DC) chopper converters mechanically coupled to the plurality of linear actuators via a worm gear system. The worm gear system includes a plurality of worm gears and a plurality of linear screws. The tracking controller includes a three-axis gyroscopic sensor and a microcontroller. The microcontroller has instructions to control the DC choppers based on data provided by the three-axis gyroscopic sensor.

The embodiment of the invention relates to the technical field of superconducting magnetic energy storage, and discloses a topological structure of a converter, a control method, equipment and a storage medium, and the topological structure is characterized in that a primary side winding of a transformer is connected to a power grid, a secondary side of the transformer is provided with a plurality of three-phase windings, and each three-phase winding is connected with an alternating current side of an inverter module group; the direct current sides of the plurality of inverter modules in each inverter module group are connected in parallel to form a direct current bus; the chopper module group is connected with one group of energy storage units in the superconducting energy storage system, and a plurality of chopper modules in the chopper module group are sequentially connected in series. According to the scheme, the inverter modules are connected in parallel, the current level can be improved by increasing the number of the parallel modules, the chopper modules are connected in series, the voltage level can be improved by increasing the number of the chopper modules connected in series, and the converter which can flexibly expand the power level to adapt to the high-power superconducting energy storage system is constructed.

The invention provides a switched capacitor notch filter for a chopping stabilized amplifier. The switched capacitor notch filter comprises a first-stage chopper, a second-stage chopper, an amplifier GM1, a first-stage amplifier GM1F, a second-stage amplifier GM2, a third-stage amplifier GM3 and the switched capacitor notch filter. The filter comprises differential capacitors C1-C2 and single-ended capacitors C3-C6, the single-ended capacitors realize control of DC voltage of an input end on an output end, and voltage drift is avoided; the clock frequency is 1 / 2 of that of a chopper clock, the transmission voltage is sampled only at the edge center of the output waveform of the chopper, and the ripple is reduced. The DC bias establishment speed can be increased, only one path of architecture is needed, the power consumption and the chip area are greatly reduced, and the method is suitable for a high-precision measurement scene.

The present disclosure relates to systems, methods, controllers and computer program products for thermal management of a brake chopper resistor. The system comprises a resistor housing portion configured to receive a cooling fluid in a cooling fluid flow path; a brake chopper resistor in the resistor housing portion; a plurality of temperature sensors in thermal communication with different respective parts of the resistor cooling flow path through the resistor housing portion and configured to measure a first temperature at a first location in the cooling fluid flow path of the brake chopper resistor and to measure a second temperature at a second location in the cooling fluid flow path of the brake chopper resistor; and control logic, configured to compare the first temperature and / or the second temperature to a threshold value or to compare the first temperature with the second temperature, and to make a determination of whether to allow activation of the brake chopper resistor in response to the comparison with the threshold value.

The utility model provides a drive control circuit and an LED driver. The driving control circuit is used for controlling the LED driver and comprises a chopping signal control circuit and a driving signal generation circuit. The input end of the chopping signal control circuit is used for being coupled with a dimming signal end, and the output end of the chopping signal control circuit outputs a chopping signal. The driving signal generation circuit comprises a delay control circuit, a brightness judgment circuit and a constant current driving circuit. The first input end of the brightness judgment circuit is coupled with the output end of the chopping signal control circuit, and the second input end of the brightness judgment circuit is coupled with a preset signal end to obtain a preset value. The input end of the delay control circuit is respectively coupled with the output end of the brightness judgment circuit and the output end of the chopping signal control circuit. The input end of the constant current driving circuit is coupled with the output end of the chopping signal control circuit. The drive control circuit and the LED driver provided by the utility model can solve the stroboflash problem and ensure the dimming resolution at the same time.

The converter (1) converts the AC power supplied from the AC power source (7) into DC power and outputs it to the DC line. The inverter (3) converts the DC power supplied from the DC line into AC power and supplies it to the load (10). The bidirectional chopper (2) exchanges DC power between the DC line and the first and second energy storage devices (8,9). The switching circuit (6) is provided between the bidirectional chopper (2) and the first and second energy storage devices (8,9). The first energy storage device (8) has a higher output density than the second energy storage device (9). The second energy storage device (9) has a higher energy density than the first energy storage device (8). The control device (5) controls the switching circuit (6) to allow charging of the first and second energy storage devices (8,9) and discharging of the first energy storage device (8) when the AC power supply (7) is healthy, and controls the switching circuit (6) to allow discharging of the first and second energy storage devices (8,9) when the AC power supply (7) is abnormal.

In the present invention, among a plurality of power conversion modules (P), a number of the power conversion modules (P) necessary to supply power to a load are placed in an operational state, and the remaining power conversion modules (P) are placed in a standby state. The power conversion modules (P) in the operational state operate a converter (1), a bidirectional chopper (5), and an inverter (6) to supply power to the load. The power conversion modules (P) in the standby state stop operation of the bidirectional chopper (5) and the inverter (6) and stand by without supplying power to the load, but do operate the converter (1). If there are two or more power conversion modules (P) in the standby state, then one power conversion module (P) of the two or more power conversion modules (P) in the standby state stops operation of the converter (1), and executes diagnostic operation for diagnosing degradation of a capacitor (3) on the basis of change over time in the direct current voltage of a direct current line (2).

The application provides a bipolar compensation type dynamic voltage regulator, method, device and storage medium, which comprises a double-chopper circuit and LC filter and transformer. In the first circuit: T1 / T2 emitter is connected in common, T2 / T3 collector is connected in common, and T3 / T4 emitter is connected in common; the second circuit is symmetrically connected. The filter inductor is connected to the T2 / T3 collector node, the capacitor is connected to the T6 / T7 collector node, and the free ends of the inductor and the capacitor are interconnected. The primary side of the transformer is connected to the LC connection point through the same end, and the non-same end is connected to the free end of the capacitor. Through the cooperative control of the double circuits: the non-working circuit is closed, the complementary conduction of the circuits is activated to generate a reverse compensation voltage; during the dead time period, the freewheeling path is constructed by using the conduction tube and the anti-parallel diode to eliminate overvoltage; the duty cycle is dynamically adjusted in real time according to the input-output voltage difference to realize accurate compensation.