39 results about "Analog feedback" patented technology

The invention discloses a control method and system for a hydraulic system of a tunnel secondary lining trolley, and the method comprises the steps that when the tunnel secondary lining trolley stops and does not work, a PLC obtains a self-checking starting instruction, and outputs a driving signal to each electromagnetic valve; the electromagnetic valve is driven to act to enable the corresponding oil cylinder to generate detection-level displacement which can be collected by the displacement sensor and does not change the working state of the corresponding template; the PLC associates and matches a driving signal output time sequence with an acquired displacement information acquisition time sequence, and establishes an actual mapping relation between a digital quantity output channel and an analog quantity feedback channel to identify the connection state of the oil pipe and the electromagnetic valve; and the PLC updates the association logic of the remote controller instruction and the digital quantity output channel based on the actual mapping relation. According to the scheme, the actual channel mapping relation is established through self-checking, the control logic is updated, the problem of control failure caused by connection dislocation of the oil pipe and the electromagnetic valve is solved, it is ensured that the remote controller can accurately control the target oil cylinder, and the control reliability of a hydraulic system and the operation safety of a trolley are improved.

The system according to this embodiment aims to enable users to practice effective proposal methods and negotiation strategies in advance, based on the characteristics of their clients' representatives. [Solution] The system according to the embodiment comprises a reception unit, a learning unit, a generation unit, a simulation unit, and a feedback unit. The reception unit inputs information of the contact person of the business partner. The learning unit learns based on the information input by the reception unit. The generation unit generates advice and suggestions based on the data learned by the learning unit. The simulation unit performs a dialogue simulation based on the advice and suggestions generated by the generation unit. The feedback unit inputs feedback on the dialogue performed by the simulation unit.

This invention provides a control channel multiplexing and docking method, apparatus, computer equipment, and medium based on a high-speed network, comprising: configuring a logical channel connected to the control system for each test site and dynamically setting IP routing mapping relationships; converting analog feedback signals output by sensors at the first test site into digital feedback signals, encapsulating them, and transmitting them to the test control room via a high-speed real-time network; receiving a first data packet, decapsulating it, converting it into an analog feedback signal, and inputting it to the control system; converting analog control commands issued by the control system into digital control commands, encapsulating them, and transmitting them to the first test site via a high-speed real-time network; decapsulating a second data packet according to its destination IP address, converting it into an analog control command, and outputting it to the actuator; updating the IP routing mapping relationship and switching the logical channel connection when switching test sites. This enables the hardware resources of a control system to be reused.

A level of thrust generated in a linear drive system is monitored by receiving an analog feedback signal at a controller from a position sensor mounted along a track for the linear drive system. The analog feedback signal varies as a function of a position of a mover traveling along the track, and the controller receives the analog feedback signal as the mover travels between a first position and a second position proximate the position sensor. An amplitude of the analog feedback signal corresponds to a value of thrust generated by the linear drive system for the mover. A change in the analog feedback signal from a nominal value of the analog feedback signal for the mover is detected as the mover travels between the first and second positions. Operation of the linear drive system is adapted when the change in the analog feedback signal exceeds a predefined threshold.

The invention discloses a radio frequency matcher control terminal which comprises a key module, a display module, an ADC sampling module, an analog interface, an MCU control module, a DAC output module and a digital interface. The key module is used for receiving menu selection, confirmation and function switching; the display module is used for displaying menu content and corresponding parameter information; the ADC sampling module is used for collecting analog feedback voltages of the TUNE capacitor and the LOAD capacitor; the analog interface is used for realizing analog signal interaction between the control terminal and an external matcher; the MCU control module is used for analyzing various input instructions, processing acquired signals and controlling the modules to work cooperatively and transmit data; the DAC output module is used for outputting feedback voltage for capacitor position adjustment to the analog interface according to an instruction of the MCU control module; and the digital interface is used for realizing digital signal interaction between the control terminal and an external matcher. Multi-mode control of the matcher is achieved, and the problems that an existing matcher is single in operation, inconvenient to switch and insufficient in remote control are solved.

The present application relates to switching power supply and DC voltage stabilizing power supply technical field, particularly to a kind of non-isolated double-state voltage stabilizing power supply control method, device and system.The device is sampled output voltage signal, after by digital discrete level transmission, by double-state comparison control unit based on preset upper and lower limit threshold value is completed discrimination, output low gear instruction, high gear instruction or gear keep instruction, drive gear selectable drive unit corresponding implementation lower speed energy conversion, higher speed energy conversion or maintain current speed energy conversion, realize output voltage stabilization.The present application overall adopts digital control architecture, without error amplifier, loop compensation network, completely discard traditional analog feedback loop, from root avoid loop temperature drift, phase lag, loop oscillation and other defects, with circuit extremely simple, response fast, strong anti-interference, long-term reliability high characteristics.

The present application relates to a kind of proportional reversing valve control drive circuit, belong to proportional reversing valve control drive technical field, solve the problem that proportional reversing valve control drive circuit is mostly one-way drive. Including: digital-analog conversion circuit, receives digital given control signal and carries out digital-analog conversion, obtains corresponding analog given control signal;The positive and negative of corresponding digital given control signal and analog given control signal are same;Forward analog feedback control circuit, based on the forward analog given control signal received and the forward current sampling signal obtained from the positive connection terminal of proportional reversing valve generates forward deviation control signal, and the forward deviation control signal is carried out pulse width modulation, amplification drive, generates the forward valve drive signal for controlling the positive connection terminal of proportional reversing valve;Reverse analog feedback control circuit, based on reverse analog given control signal generates the reverse valve drive signal for controlling the negative connection terminal of proportional reversing valve.

A microelectromechanical system with a micromechanical rotation rate sensor and at least one drive control unit. The micromechanical rotation rate sensor includes a drive unit. The at least one drive control unit includes a first part. The first part includes at least one demodulation unit, wherein analog demodulation of at least one analog feedback signal of the drive unit can be carried out by the at least one demodulation unit of the first part of the drive control unit.

The application discloses a sensor signal sampling circuit, a method and a sensor, and relates to the technical field of sensors. The sensor signal sampling circuit comprises a first amplification module, a mode switching switch, a differential amplification module and a control unit. The input end of the first amplification module is connected with a sensor reading head. The mode switching switch is arranged at the output end of the first amplification module. The output end of the differential amplification module is connected with the input end of an analog-to-digital converter. The output end of the analog-to-digital converter is connected with the control unit. The control unit is further provided with an analog feedback signal output end which is connected with the first input end of the differential amplification module. The amplification gain of the first amplification module is smaller than that of the differential amplification module. When the mode switching switch is in a first conduction state, the output end of the first amplification module is connected with the input end of the analog-to-digital converter. When the mode switching switch is in a second conduction state, the output end of the first amplification module is connected with the second input end of the differential amplification module. Through the sensor signal sampling circuit, the measurement accuracy can be ensured while a large range measurement is met.

The invention relates to an impedance measurement system and an impedance measurement method. The system comprises an error current detection module, a digital vector negative feedback module and a feedback current output module. The error current detection module is used for detecting error current flowing into the input end of the error current detection module and converting the error current into a digital error signal; the digital vector negative feedback module is used for generating a digital feedback signal based on the received digital error signal and a preset orthogonal reference signal; and the feedback current output module is used for converting the received digital feedback signal into an analog feedback current until the error current value is 0. Through high-precision digital vector negative feedback, the error current corresponding to the measured device can be eliminated in a wide frequency range, the current measurement accuracy of the measured device is improved, and the impedance measurement accuracy of the measured device is further improved.

A bias circuit (100) of an avalanche photodiode, APD, comprising: a voltage conversion module (110) connected to the APD, wherein the voltage conversion module(110) is configured to convert an input supply voltage (Vin) to a bias voltage for the APD; an error amplifier (120) connected to the voltage conversion module (110) for implementing a feedback control; a voltage feedback loop (130) configured to provide the error amplifier (120) a first analog signal related to the bias voltage; and a current feedback loop (140) configured to provide the error amplifier (120) a second analog signal related to the APD current; wherein the error amplifier (120) is configured to control the voltage conversionmodule (110) based on the first and the second analog signals.

The invention discloses an ambient light elimination method, a light detection sensor and a system, and belongs to the technical field of proximity light sensors. In the calibration stage of the sensor, a current compensation module dynamically adjusts compensation current according to a compensation control signal output by an error amplification module, counteracts a current signal generated by ambient light and establishes a compensation state; in the detection stage, the current compensation module keeps the established compensation state, so that the compensation current continues to offset the ambient light current, and the integrator module only carries out integration on the current corresponding to the target light signal. According to the invention, a method for later compensation depending on digital signal processing and a digital-to-analog converter in a traditional scheme is abandoned, a front-end analog direct elimination mechanism is provided, ambient light current is directly offset through an analog feedback loop in an initial stage of a signal chain, namely before analog-to-digital conversion, and delay and precision limitation caused by digital processing are avoided.

This invention provides a control system and method for an underwater or sub-ice exploration robot applied to confined space exploration. One aspect of the control system includes a load-bearing umbilical cable. One end of the umbilical cable is connected to an ROV (Remotely Operated Vehicle), and the other end is wound around a winch drum. A magnetic ring is fixed to the end of the umbilical cable connected to the ROV, forming a linkage structure with the ROV to generate analog feedback to the control unit. A spring-loaded structure for resetting the magnetic ring is provided between the magnetic ring and the ROV. A tension sensor for monitoring the tension on the umbilical cable is fixed to one side of the winch, and the tension sensor is connected to the control unit. This invention can detect the umbilical cable status in real time and adaptively adjust the umbilical cable length, ensuring that the umbilical cable does not become taut due to contact with obstacles it avoids. This allows the ROV to autonomously return from complex terrain after completing observations in confined areas.

The utility model belongs to the field of simulation feedback devices, and particularly relates to a simulation feedback device for medical education, which comprises a simulator, a universal wheel disc is fixedly mounted at the lower end of the simulator, a mounting frame is fixedly connected to the lower part of the front surface of the simulator, and a wire holder is slidably connected to the lower end of the mounting frame. A dismounting mechanism is arranged on the outer side of the wire holder, a connecting frame is fixedly connected to the middle of the outer side of a rod piece of the simulator, a storage box is fixedly connected to the front face of the connecting frame, and a wire arranging frame is fixedly connected to the side, away from the storage box, of the connecting frame. The simulator is additionally provided with the wire arrangement frame, the wrapping post, the mounting frame and other structures, a circuit can be wound and stored through the wrapping post and the movable cover in the using process, later-stage wire finding and operation of a student can be facilitated, meanwhile, the wire holder can be detached through the detaching mechanism, and the simulator is convenient to use. Therefore, the socket on the wire holder of the simulator can be conveniently displayed.

A distributed control system with multiple controllers generates a request data packet in a first controller. The request data packet is transmitted from the first controller to a second controller, and the request data packet is received at the second controller. The second controller simulates the presence of a signal on the second controller. The simulated signal is used by a series of instructions stored on the second controller, and the simulated signal is not present at an input for the second controller. The series of instructions are executed in response to receiving the request data packet, and a response data packet is generated on the second controller as a function of simulating the presence of the feedback signal and executing the series of instructions. The response data packet is transmitted from the second controller to the first controller.

The invention discloses a sensor signal sampling circuit and method and a sensor, and the circuit comprises a first amplification module of which the input end is connected with a sensor read head; the mode change-over switch is arranged at the output end of the first amplification module; the output end of the differential amplification module is connected with the input end of the analog-to-digital converter; the control unit is connected with the output end of the analog-to-digital converter, the control unit is further provided with an analog feedback signal output end, and the analog feedback signal output end is connected with the first input end of the differential amplification module; wherein the amplification gain of the first amplification module is smaller than that of the differential amplification module; when the mode change-over switch is in a first conduction state, the output end of the first amplification module is connected with the input end of the analog-to-digital converter; and when the mode change-over switch is in a second conduction state, the output end of the first amplification module is connected with the second input end of the differential amplification module. Through the sensor signal sampling circuit, measurement precision can be guaranteed while wide-range measurement is met.

The invention relates to metastable state detection and correction in analog-to-digital signal converters. Embodiments disclosed herein relate to detecting metastable states to reduce noise and improve performance of an analog-to-digital converter (ADC) (120). In an example, an ADC (120) is provided that includes comparator circuitry (comparator 215), synchronization circuitry (synchronizers 225 and 230), digital output circuitry (SAR circuitry 235), and stability check circuitry (digital stability checker circuitry 240). The comparator circuitry performs a comparison of an analog input signal and an analog feedback signal and outputs a result of the comparison. Synchronization circuitry samples the results of the comparison at different times, resulting in a first sampled value and a second sampled value. The digital output circuitry generates a digital output signal based on the first sampling value and outputs the digital output signal. Stability check circuitry determines whether a metastable condition occurs with respect to the analog-to-digital converter based on the first sampled value and the second sampled value, and outputs an indication of whether the metastable condition occurs.

A circuit comprising (1) one or more input devices configured to sense analog inputs, (2) at least one analog-to-digital converter communicatively coupled to the input devices and configured to convert the analog inputs into digital inputs, (3) at least one filter component communicatively coupled to the analog-to-digital converter and configured to output digital feedback based at least in part on the digital inputs, and (4) a digital-to-analog converter communicatively coupled to the filter component and configured to (A) convert the digital feedback into analog feedback and (B) output the analog feedback to facilitate removing the analog feedback from the analog inputs. Various other apparatus, systems, and methods are also disclosed.

The application provides a power waveform generator with a four-quadrant feedback loop and a control method thereof. The generator is controlled by a user through a host computer and a graphical interface to output a first control signal and a second control signal. The first control signal is input to an FPGA+ARM main control board, parsed into secondary instructions and sent to an auxiliary FPGA, and then used to control a digital-to-analog converter to generate a digital-to-analog converted signal and output the signal to a four-quadrant analog feedback loop to generate an arbitrary waveform signal. The second control signal is directly used to control a bias adjustment circuit to output a suitable bias signal to the four-quadrant analog feedback loop. The four-quadrant analog feedback loop superimposes and processes the received signal to output a voltage and current signal to a bit number expansion circuit, and further drives an operational amplifier bootstrap network to generate a voltage drive waveform, and then generates an arbitrary-shaped power waveform through a push-pull output network.

A DAC for use in an incremental analog-to-digital converter, iADC, configured to convert a multi-bit word (x[n]) into an analog feedback signal (y[n]). The DAC comprises a MMS logic block. It further comprises a plurality of output elements configured to generate a respective analog portion (y i [n]) based on a selection vector (s[n]), and a signal combiner for combining the analog portions (y i [n]) into the analog feedback signal (y[n]). In the MMS logic block, cascaded switching zone blocks are provided. Each switching zone block receives at least a portion of the multi-bit word (x[n]), splits the portion into two sub-portions, and forwards each sub-portion to one of a subsequent switching zone block or an output element. A weight factor (W[n]) is adjusted by multiplying the weight factor with a difference of the two sub-portions. A weight accumulator accumulates successive adjusted weight factors (W’[n]), wherein how a portion of a further multi-bit word (x[n]) is split is determined based on a sign of the weight accumulator.

The embodiment of the invention relates to the technical field of operation risk control, and discloses an intelligent operation risk prevention and control method, device and equipment based on digital twinning and behavior analysis, and the method comprises the steps: obtaining an operation intention and operation key features of a to-be-executed operation; performing prediction processing on the operation intention, the knowledge graph and the operation key features by using a risk assessment model, and outputting an operation risk score of the to-be-executed operation, wherein context information, operation environment information and historical operation information related to the to-be-executed operation are stored in the knowledge graph; simulation execution of the to-be-executed operation in the digital twin environment is determined based on the operation risk score, and simulation feedback information is collected; and generating an operation authority for executing the to-be-executed operation based on the simulation feedback information so as to execute the to-be-executed operation based on the operation authority in the real environment. By fusing various information, the operation risk is scored by using the risk assessment model before the to-be-executed operation is executed, so that the accuracy, timeliness and intelligent level of high-risk operation identification are improved.

A level of thrust generated in a linear drive system is monitored by receiving an analog feedback signal at a controller from a position sensor mounted along a track for the linear drive system. The analog feedback signal varies as a function of a position of a mover traveling along the track, and the controller receives the analog feedback signal as the mover travels between a first position and a second position proximate the position sensor. An amplitude of the analog feedback signal corresponds to a value of thrust generated by the linear drive system for the mover. A change in the analog feedback signal from a nominal value of the analog feedback signal for the mover is detected as the mover travels between the first and second positions. Operation of the linear drive system is adapted when the change in the analog feedback signal exceeds a predefined threshold.

An analog-to-digital conversion circuit, a chip, and a recording device are provided. The analog-to-digital conversion circuit includes a main path module, a dynamic range enhancement module, and a dynamic digital-to-analog conversion module. The main path module converts an analog signal and an analog feedback signal into a digital signal to be processed, outputs the digital signal to be processed to the dynamic range enhancement module, and obtains a digital signal output according to the digital signal to be processed and the digital gain signal. The dynamic range enhancement module performs dynamic quantization processing on the digital signal to be processed to obtain at least one control signal and generate the digital gain signal. The dynamic digital-to-analog conversion module dynamically controls on and off of each of DAC elements in a digital-to-analog conversion array according to the at least one control signal and generates the analog feedback signal.

The application discloses a kind of double-resonance MEMS sensor and its working method, double-resonance MEMS sensor includes: first oscillator, second oscillator, frequency discriminator and phase detector and delay control circuit;Oscillator includes resonator and resonance circuit, resonance circuit includes delayer;Resonator detects the capacitive signal generated by signal to be measured, resonance circuit is used to output analog feedback signal under the control of delayer according to capacitive signal, analog feedback signal is input into resonator to form closed loop circuit;Frequency discriminator and phase detector detect the frequency and phase of the digital signal input into two delayers, output control signal of delay control circuit when frequency difference is less than preset first threshold and phase difference is less than preset second threshold, and delay control circuit controls two delayers to carry out delay adjustment according to control signal, so that the phase of two analog feedback signals is out of step.The application can avoid the problem of resonance measurement blind area when the frequency of two resonators of double-resonance MEMS sensor is close.

The embodiment of the invention discloses a control method of a Sigma-delta ADC, the Sigma-delta ADC and a storage medium, and belongs to the technical field of analog-to-digital conversion circuits, the Sigma-delta ADC comprises an ADC quantizer and a DAC in a feedback channel, and the DAC comprises N feedback capacitors and k auxiliary capacitors; the control method comprises the following steps: when the output value of an ADC quantizer is a constant value, obtaining the total number of capacitors in a DAC; wherein the total number of the capacitors is the sum of N and k; obtaining an input code of the DAC according to the output value of the ADC quantizer; determining the distribution frequency of the tone of the DAC according to the sampling clock frequency of the Sigma-delta ADC, the total number of capacitors and the input code; and in each sampling period, k capacitors are selected as reference capacitors, and on the basis of the reference capacitors, a capacitor to be selected is determined according to the input code, so that an analog feedback signal is generated and transmitted to the ADC quantizer; wherein the reference capacitor does not participate in the selection process triggered by the input code, and the positions of the reference capacitor in at least part of the sampling periods are different. According to the invention, the performance of the Sigma-delta ADC can be improved.

Embodiments disclosed herein relate to digital signal processing, and more particularly, to detecting metastability to reduce noise and improve performance of an analog-to-digital converter (ADC). In an example, an ADC is provided that includes comparator circuitry, synchronization circuitry, digital output circuitry, and stability checking circuitry. The comparator circuitry performs a comparison of an analog input signal to an analog feedback signal and outputs a result of the comparison. The synchronization circuitry samples the result of the comparison at different times, resulting in first and second sampled values. The digital output circuitry generates a digital output signal based on the first sampled value and outputs the digital output signal. The stability checking circuitry determines whether a metastability condition occurred with respect to the analog-to-digital converter based on the first and second sampled values and outputs an indication of whether the metastability condition occurred.

The invention relates to an "adaptive method for digital PID controller" which aims to automatically adjust the parameters of a digital PID controller by analog feedback of the actual value for the automation of process flows in programmable logic controllers. The invention is based on the use of nine regulation equations derived by reverse engineering of a PID controller. The adjustment of the PID controller parameters K p , K i and K d is performed in a closed loop control with negative feedback, i.e. the iterative steps for K p are k, for K i are m and for K d are n, independent of each other. The adaptive regulation method is compact, independent of other methods and algorithms, mathematically balanced, i.e. requires minimum computational resources and easy to implement. Setting up a PID controller with this method does not require a preliminary assessment of the controlled object and the establishment of a mathematical model. This also means that the method has good general applicability and is not linked to a specific controlled object.

The application discloses a kind of control method and system of tunnel second lining trolley hydraulic system, the method includes: when tunnel second lining trolley stops and does not work, PLC obtains self-checking start instruction, to each electromagnetic valve output drive signal, drive electromagnetic valve action makes corresponding cylinder produce the detection level displacement that can be collected by displacement sensor and does not change corresponding template working state;PLC will drive signal output time sequence and the displacement information acquisition time sequence of association matching, establish the actual mapping relationship of digital output channel and analog feedback channel to identify the connection state of oil pipe and electromagnetic valve;PLC is based on actual mapping relationship and updates the associated logic of remote controller instruction and digital output channel.The scheme is adopted, and the actual mapping relationship of channel is established by self-checking and control logic is updated, the problem that control failure caused by oil pipe and electromagnetic valve connection misplacement is solved, ensure that remote controller can accurately control target cylinder, improve the reliability of hydraulic system control and trolley operation safety.

The invention provides a test device and method for a brush motor controller based on ripple signals, and belongs to the technical field of automobile detection. According to the invention, the ripple simulation test device is connected with the to-be-tested ripple motor controller, the running state of the controlled brush motor is simulated when the motor driving signal sent by the ripple motor controller is detected, and the simulation feedback signal in the current state is calculated and generated; in addition, injection events can be directly added in the running process of the ripple simulation testing device, testing without actual parts is achieved, the testing cost is reduced, the testing efficiency is improved, the problem of motor stalling damage caused by misoperation is avoided, meanwhile, different working conditions can be directly simulated, and the testing efficiency is improved. Verification of different items is met by changing motor setting parameters loaded in the ripple simulation test device, limitation is smaller, adaptability is higher, control is easy, and industrial development is facilitated.