109 results about "Direct digital control" patented technology

The invention discloses a cold source centralized digital control method based on energy consumption monitoring. The cold source centralized digital control method based on energy consumption monitoring comprises the following steps that a, real-time monitoring is conducted on power utilization, water utilization, the cooling quantity, the temperature, the pressure and the equipment state of a cold source system of a central air conditioner; b, energy consumption data and system state data collected in the step a are summarized, real-time refrigerating efficiency of the cold source system is calculated according to operating power parameters of a water chilling unit, a chilled water pump, a cooling water pump and a cooling tower fan in the system and the refrigerating capacity of the water chilling unit, forecast energy consumption data at present are obtained through forecasting according to outdoor temperature and humidity parameters at present, indoor temperature and humidity parameters at present and a load forecast model, the forecast energy consumption data and the energy consumption data which are actually monitored are compared, problems existing in the use process of a refrigerating system are found, and an optimized operation control strategy of the cold source system is formed; c, the optimized operation control strategy formed in the step b is conducted, and optimized operation control is achieved through a direct digital controller and an electrically operated valve connected with the direct digital controller.

The invention discloses a variable air volume air-conditioner control system with a variable frequency fan and a digital air valve for adjusting tail end air volume and an implementation method, belonging to the technical field of the control of a variable air volume air-conditioner system. The variable air volume air-conditioner control system structurally comprises a master station DDC (direct digital control) controller, a tail end temperature controller, a filed bus, a tail end variable air volume box (VAV-BOX) and an air valve driver, comprises mater station DDC control and tail end temperature controller control in control types, and adopts a strategy of collective processing at first and decentralized control later. Through a method for adjusting the tail end air volume by the variable frequency fan and the digital air valve, the variable air volume air-conditioner system eliminates throttle energy loss of the air valve without a device for measuring the air volume, has simple control type and no influence on the operation of the whole variable air volume system, and has the advantages of good system stability and obvious energy-saving effect; and the fault on the variable air volume tail end device of certain node has no influence on the normal operation of other variable air volume tail end devices.

The invention is applicable to the field of nuclear power control, and provides a method and a system for digitalizing an overall grogram of a nuclear power plant and a digital control system (DCS) control system. The method comprises the following steps of: searching a digitalized operation sheet corresponding to task information according to a program main body, wherein the program main body comprises output task information, digitalized operation sheet information corresponding to the task information and supporting interface information; outputting task detail information, equipment information corresponding to the task detail information, and link information according to the searched digitalized operation sheet; and sending a link instruction to the supporting sheet by the digitalized operation sheet, and outputting a monitoring parameter and an operation instruction across the system by the supporting interface which receives the link instruction. By the invention, the defect of the DCS in the intuitive aspect is overcome, the operating efficiency of the overall program of the nuclear power plant is improved, and the advantages of the DCS in information processing are fullyexerted.

The invention discloses a light high-accuracy digital control system for a miniature flywheel. The system belongs to a kind of posture control execution mechanism applied to miniature satellites which are lighter than 100Kg, and mainly comprises a field programmable gate array (FPGA) module, a three-phase full-bridge driving device, an RS-232 communication circuit, a Buck converter, an analogue-to-digital (AD) sampling circuit and a signal conditioning circuit, a Hall signal filter and the like, wherein the FPGA module comprises an instruction parser, a moment-current converter, a single-neuron adaptive proportion integration differentiation (PID) controller, a pulse width modulator (PWM), a commutation logic signal generator and the like. By the invention, a nonlinear transformation online correction method is adopted; the digital control system for the miniature flywheel is formed by taking the FPGA module as a control core based on a single-neuron adaptive PID control algorithm; and the high-accuracy moment output of the posture control execution mechanism for the miniature satellite is realized by adopting a moment mode. The invention has the characteristics that: the algorithm is simple and easy to implement; the system is quick in response, low in power consumption, high in reliability, flexible in design and particularly suitable for the miniature satellite; the power density of the miniature flywheel is increased; the mass and volume of the miniature flywheel are decreased; and cost is decreased.

The invention discloses a portable HDMI CEC automatic testing device and a testing method thereof. A testing device circuit comprises a power resource and a micro control unit MCU, wherein the micro control unit MCU is respectively connected with an HDMI interface and an LED status indicating circuit, and the power resource supplies electricity to the MCU and the LED status indicating circuit. The MCU detects +5V on the HDMI interface and hot plug detects (HPD) signals of the two pins, is communicated with a test object through a bus of a direct digital control system DDC and a bus of a CEC, automatically completes the test of the CEC function of the HDMI equipment, and displays a test result through the LED indicating circuit, wherein the LED status indicating circuit consists of a luminous diode. The invention is simple in structure, convenient in operation, low in cost, high in production efficiency, very small in whole volume due to few devices, convenient for the product manufacture of the quality test, completely automatic in the whole test process, simple, convenient and practical.

The invention discloses a high power density charging module and method based on all-digital control. A three-phase Wiener PFC circuit is subjected to double-loop control of a voltage outer loop and an AC current inner loop of a DC bus. A three-level LLC DC converter is subjected to pi control operation of the voltage and current loops. Meanwhile, the operational results of the voltage and current loops are compared in real time to determine the larger value, and the control mode thereof is used for driving the three-level LLC DC converter so that the charging module is in a constant voltage or constant current charging state. According to the invention, the miniaturized high power density of the charging module is realized by optimizing main circuit topological parameters, using control strategies and the like under the premise that the output power level is unchanged, the size of the single machine charging module is reduced, the size of the whole charging system device is thus reduced, the hardware cost and the manpower for engineering debugging are reduced, and the light weight and easy maintenance are realized.

The invention discloses a multi-channel demodulation signal processing platform based on a CPCI (compact programmable communication interface). The demodulation signal processing platform comprises a multi-channel intermediate-frequency signal receiving module; the multi-channel intermediate-frequency signal receiving module can be connected with at least one A/D (analog/digital) conversion module and at least one DDC (direct digital control) digital down converter module; the DDC digital down converter module is connected with an FPGA (field programmable gate array) module; and the FPGA module is connected with a DSP (digital signal processor) module and a CPCI module. By using the multi-channel demodulation signal processing platform based on the CPCI, which is provided by the invention, the analog signal reception and the digital signal sending are integrated into a whole; the parallel and independent A/D conversion module and a DDC digital down converter passage are adopted; at least one intermediate-frequency signal of satellite mobile communication can be received; the multi-channel demodulation signal processing is realized; and the signal processing platform is compatible with signal processing techniques with different modes, different systems and different speed rates, and has stronger practicability.

A method is directed to providing adaptive digital control for the PFC front-end of a switching mode power supply. The method uses an evaluation model to adjust control loop parameters of a control algorithm used by a controller on the primary side of the power supply. The method performs a series of step adjustments of the control loop parameter values to determine optimized values. In some implementations, the method determines and compares the line current THD corresponding to different control loop parameter values. The method provides simplified digital control loop design, optimizes PFC front-end performance, improves system efficiency by decreasing harmonic ripples, and reduces labor cost and time to market due to shorter research and development phase. System performance optimization is fully adaptive adjusted for changes in operating conditions due to, for example, environmental and temperature variations.

The invention provides a free monitoring point increase and decrease direct digital controller, which comprises power modules with different powers, microprocessor modules with different processing speeds, an identical single-way analog quantity digital value input module, an identical single-way analog quantity digital value output module, a man-machine interface and an expansion module, wherein the microprocessor modules are in plug-in connection with the power supply modules by connecting point terminals and in plug-in connection with both the single-way analog quantity digital value input module and the single-way analog quantity digital value output module. The controller has the advantages that: the structure is modularized, point redundancy is avoided, and the costs of all links including purchase, storage, production, finished product, sale, after-sales service, installation, debugging, maintenance and the like are reduced; electronic waste is reduced, which contributes to environmental protection; and the large-scale production and operation are convenient. The controller can perform in-situ display control, network communication and expansion control and can also perform configuration monitoring in a control controller. The controller can be widely used in various fields requiring complex control, such as intelligent buildings, industrial control, automobiles, ships and aviation.

The invention provides a real-time fresh air volume calculation method and belongs to the technical field of air volume calculation for a central air conditioning system. The method is based on a CO2 concentration monitoring device and used for calculating real-time demanded fresh air volume of air conditioning areas and requires installation of a CO2 concentration detector or people detectors as well as an air volume detector in the air conditioning areas. For an area with stable people density, the people density can be considered to keep a designed value. A system fresh air volume set value obtained through calculation can be applied to a system equipped with a direct digital controller and is used for setting the minimum fresh air volume of an air cabinet of a multi-area air volume variable system. The design is reasonable, and real-time demanded fresh air volume of each area and demanded fresh air volume of the system can be calculated, so that the minimum fresh air volume set value of the system can be set and used for regulating opening of a fresh air valve of the system.

The invention discloses a method and device for nuclear power station to generate virtual digital control system configuration file, wherein the method for nuclear power station to generate virtual digital control system configuration file mainly comprises the following steps: reading an actual digital control system configuration file; classifying the read actual digital control system configuration file according to a preset virtual digital control system function block; replacing the function block in the actual digital control system configuration file after the classification with the virtual digital control system function block through the inquiring of a preset mapping database; and generating the virtual digital control system configuration file from the actual digital control system configuration file after the classification according to the code rule of the virtual digital control system. The invention can finish the fast conversion of the configuration file to the virtual digital control system configuration file which can be recognized by the computer with short realizing time, high accuracy rate, simple and convenient modification and update.

The invention discloses a digital down-converting system for implementing a frequency-agility metrewave radar. The digital down-converting system comprises a DDC (direct digital control) module, an NOC (numerical controlled oscillator) module, an A/D (analog/digital) sampling module, a frequency mixing module and a filtering module; the DDC module outputs working frequency points of a radar system to the NCO module and controls time sequence of the entire DDC module, the A/D sampling module quantizes radar echo signals, frequency mixing with local oscillating signals output by the NCO module to acquire zero intermediate frequency IQ two-way signals, and finally the filtering module filters to output the satisfactory zero intermediate frequency IQ two-way signals. Compared with the prior art, the digital down-converting system has the advantages that the working frequency points of the frequency-agility metrewave radar are limited and discontinuous, an implementation different with an original NCO module is adopted, resource consumption of an FPGA (field programmable gate array) is reduced, the local oscillating signals higher in frequency resolution can be acquired as well, a digital down-converting function of the frequency-agility metrewave radar is well achieved, and the high-quality local oscillating signals are required for frequency agility.

The invention provides a digital control method and a digital control system of a primary circuit hydrostatic test of a pressurized water reactor nuclear power station, suitable for the nuclear power control field. The method comprises the following steps of: displaying key parameters, a control operation inlet and important alarming related to the primary circuit hydrostatic test on a hydrostatic test control interface; and directly controlling the primary circuit hydrostatic test process through the control operation inlet displayed on the hydrostatic test control interface according to the key parameters displayed by the hydrostatic test control interface. By the method of the invention, the key parameters, the control operation inlet and the important alarming related to the primary circuit hydrostatic test are displayed on the hydrostatic test control interface, and the primary circuit hydrostatic test process is directly controlled through the control operation inlet displayed on the hydrostatic test control interface according to the key parameters displayed by the hydrostatic test control interface, so as to visually and rapidly control the primary circuit hydrostatic test process.

The invention relates to a digital hydraulic control valve, and belongs to the technical field of hydraulic driving and controlling. The digital hydraulic control valve comprises five groups of flow control units which are same in structure. Each flow control unit is composed of connecting of eight sets of electro-magnetic switch valves with throttling openings in parallel. The drift diameters of the electro-magnetic switch valves are totally same. The throttling areas of the throttling openings are coded by adopting the Fibonacci sequence. By controlling the combining state of electro-magnets of the electro-magnetic switch valves, the control over the output flow (the size and the direction) and the pressure can be achieved. The resolution ratio and the maximum flow of the valves can be confirmed according to the actual needs. The digital hydraulic control valve is formed by the regular electro-magnetic switch valves and the throttling openings, the structure is simple, the cost is low, the advantages of the switch valves are continued, the reliability is high, the anti-pollution capacity is strong, the all-digital control is achieved, multiple control modes and working modes are achieved, the control freedom degree is high, the flexibility is high, the fault diagnosis is easy to carry out, and the great fault-tolerant capability is achieved.

The invention discloses a long term evolution-interference cancellation system (LTE-ICS) and method. The system comprises an analog-digital conversion (ADC) module, a first complex frequency mixing processing unit, a direct digital control (DDC) module, an interference cancellation system (ICS) echo self-cancellation module, a digital up conversion (DUC) module, a second complex frequency mixing processing unit and a digital-analog conversion (DAC) module, which are sequentially connected with one another; and the system is characterized in that the ICS echo self-cancellation module comprises a first accumulator unit, a gain control unit, a delay unit, an XCORR module, a least mean square (LMS) module and a second accumulator unit; the input end of the first accumulator unit is connected to the output end of the DDC module and the output end of the second accumulator unit, and the output end of the first accumulator unit is connected to the input end of the gain control unit; the output end of the gain control unit is connected with the input end of the XCORR module and the input end of the delay unit; and the output end of the delay unit is connected to the input end of the XCORR module and the input end of the LMS module, the output end of the XCORR module is connected to the input end of the LMS module, and the output end of the LMS module is connected to the input end of the second accumulator unit. The system and the method are used for the self cancellation of the interference of a LTE wireless co-channel repeater.

An electrical power management system includes a power intervening panel having a low voltage power supply having a low voltage output electrically coupled to a low voltage circuit, a low voltage common and a power load input, a power module array having a plurality of power contactor modules wherein each of the plurality of power contactor modules has a power contactor with a power load input and a power load output switchable between a closed and an open position and a low voltage switch operably connected to the power contactor for switching the power contactor between the closed and the open position, a low voltage signal relay module having a plurality of signal couplings wherein a primary coupling is a low voltage signal output connected to the low voltage power supply for transmitting a low voltage output signal to one of a direct digital controller and a digital timer and wherein a secondary coupling is a low voltage signal input for receiving the low voltage output signal from one of the direct digital controller and the digital timer, the secondary coupling being electrically coupled to the low voltage switch of one of the plurality of power contactor modules, and an enclosure containing the low voltage power supply, the power module array and the low voltage signal relay module.

The invention discloses an automatic control system for air-conditioning dust removal in a cotton spinning mill, which includes a pipe connecting the controlled workshop of the cotton spinning mill and an air-conditioning room, and a temperature and humidity sensor and an enthalpy transmitter are arranged at the fresh air inlet of the air-conditioning room; Air valves, return air valves, and fresh air valves are equipped with electric actuators for air valves; electric valves are installed on the water supply pipes and steam pipes in the air-conditioning room; the air volume of the sending and returning fans is controlled by frequency converters; A dew point temperature sensor is set after the spray section of the room; a direct digital controller is set near the air-conditioning room. The invention has the advantages of greatly saving energy consumption of water, electricity, steam, cold source and heat source. It can save more than 40% energy for air conditioners in textile factories. High precision control of temperature and humidity in textile process. The control accuracy is within ±0.5°C for temperature and within ±3% for relative humidity. Greatly improved the quality of finished and semi-finished textile products. Greatly reduced labor costs.

The invention discloses a data configuration diagnosis system and method of a digital control system. The system comprises a user terminal used for uploading a configuration file of the digital control system; and a service terminal connected with the user terminal and used for uploading, storing and analyzing the configuration file and feeding back an analysis process and an analysis result of the configuration file to the user terminal. The method comprises the following steps: uploading the configuration file, importing the configuration file, analyzing the configuration file and performing analysis and feedback. By adoption of the data configuration diagnosis system and method disclosed by the invention, configuration analysis and configuration check can be performed on the configuration of the DCS system, the DCS configuration is specifically analyzed by using counting, comparing, classifying, contrasting and other methods, a result is displayed for a user in a chart and other visual forms, the user is helped to find DCS configuration errors and configuration loss in time so as to find and eliminate hidden dangers as soon as possible, and thus a DCS device and especially a nuclear power plant DCS device can enter a high availability status as soon as possible.

The invention relates to a charging system of a tail end box of a variable air volume central air conditioner and a charging method, wherein the charging method comprises the following steps: A. a direct digital controller meters an instantaneous air volume value of the tail end box of the variable air volume air conditioner, and transmits the metered instantaneous air volume value to a belonged network controller; B. a variable air volume metering manager reads the above instantaneous air volume value from the network controller by a switch and carries out accumulation; C. the variable air volume metering manager transmits accumulated air volume information when the direct digital controllers of the tail end box of all the variable air volume air conditioners are in the charging time interval to a local charging processor; D. the local charging processor calculates the unit price of the cold quantity of the central air conditioner in the time interval; E. the local charging processor calculates the cold quantity consumed by the tail end box of a certain variable air volume air conditioner; and F. the local charging processor calculates the consumed cold quantity cost according to the cold quantity of the tail end box of a certain variable air volume air conditioner and the unit price of the cold quantity. The invention has simple charging mode, low cost, is charged according to actual usage and has reasonable charging mode.

The invention discloses a building intelligent auto-control system DDC (direct digital control) and an auto-control method and belongs to the technical field of electronic information. The building intelligent auto-control system DDC comprises an information acquisition unit, an information communication unit, an information processing control unit, an information feedback unit and an information display unit. The DDC functions of the subsystems of a building auto-control system are implemented by the use of the embedded and internet-of-things technology, connection to an upper platform or a field node can be of a wired or wireless manner, the problem that the subsystems of the building auto-control system have abundant protocols unable to be uniformized is effectively solved, the building auto-control system is uniformized and simplified, and the building auto-control system is higher in speed, reliability and flexibility.

The invention provides a multi-axis linkage embedded type digital control system and a development method thereof. The method comprises steps of constructing a hardware platform; designing a hardwarecircuit; transplanting an ARM-linux embedded real-time operation system, carrying out RTOS development on a multi-core processor; establishing communication between inner cores of the multi-core processor, establishing communication between the multi-core processor and an FPGA, developing firmware programs of a periphery circuit module and solidifying DSP, the FPGA firmware programs and the ARM application programs to the system. The digital control system comprises the multi-core process, the FPGA, a power supply module and the periphery circuit module based on FPGA expansion. The power supply module is connected with the multi-core processor, the FPGA and the periphery circuit module. The multi-core processor is connected with the FPGA. According to the invention, design difficulty levelof the system can be effectively reduced; development period is greatly shortened; and the system and the method help users to concentrate on solving specific application problems.

The invention discloses a method for reducing the uplink noise of a GSM (Global System for Mobile Communications) digital repeater, which comprises the following steps of: processing an uplink GSM signal by a DDC (Direct Digital Control) module to obtain a baseband I/Q signal of each carrier wave; determining the border of each time slot of each carrier wave according to an uplink border indication pulse signal; and counting the powers of all time slots, if the power value is smaller than the threshold power value configured by an upper computer, considering the time slot as noise, and setting the baseband signal I/Q of the time slot to zero. The method is realized in a digital board of a remote computer, the uplink noise of the remote computer is eliminated, and the method can be used for eliminating the noise on an uplink useless channel.

This invention publicized belonged to the diesel engine fuel injection installment one kind of electric control in line combination to pump/the valve - tube - mouth to spray the diesel oil injection system. Should the injection system mainly include the electronic control unit, in line the combination pumps/the valve mechanism, the high-pressure oil pipe, the spray hole and the low pressure fuel oil system. The characteristic is in line the combination pumps/the valve mechanism plunger partner to use the direct jack-in type structure, in pump body in-line type arrangement; The plunger partner's plunger crown does not have the skewed slot, only undertakes for the oil and pressurizes the function; Integrates on in in the plunger partner plunger cavity high-pressured oil duct has the high speed solenoid valve module, solenoid valve coil and the electronic control unit is connected, by electronic control unit through solenoid valve direct control fuel injection process; This system not only causes the oil pump structure to simplify, the intensity increases, greatly enhanced has supplied the oil pressure, moreover caused for the oil process and the adjustment process decoupling, has realized through the high speed solenoid valve module to fuel injection the process direct digital control; The blow rule for a more ideal wedge, has the low initial blow rate, high host spraying rate, the fast high-pressured unloading and the remaining fluctuation of pressure are small and so on the merit: Also system layout simple, transforms few to the engine main body, the transplant is convenient.

The invention relates to a video signal interface circuit and particularly discloses an insulation protective circuit for a DDC (Direct Digital Control) interface. A bidirectional insulator is connected onto each signal line between a DDC interface on a video signal input interface and an I2C (Inter-Integrated Circuit) interface of an E-EDID (Enhanced Extended Display Identification Data) information memory stack of video signal receiving equipment, each bidirectional insulator is connected with a pull-up resistor, and the E-EDID information memory stack of the video signal receiving equipment is connected with a pull-up resistor; and a bidirectional insulator is connected onto each signal line between the I2C interface of the E-EDID information memory stack of the video signal receiving equipment and an I2C interface of a local control core of the video signal receiving equipment, and the local control core of the video signal receiving equipment is connected with a pull-down resistor and a field effect tube. In the invention, a protective circuit is additionally arranged, thereby ensuring that no conflicts can be generated among the circuits of various parts in the aspects of electrical property and data reading/writing operation, preventing the data loss, and facilitating the maintenance process.

The invention relates to a non-linear distortion compensation device of a power amplifier. The non-linear distortion compensation device of the power amplifier comprises a first analog-to-digital converter, a field programmable gate array (FPGA), a digital-to-analog converter, the power amplifier and a second analog-to-digital converter, wherein the first analog-to-digital converter, the FPGA, the digital-to-analog converter, the power amplifier and the second analog-to-digital converter are connected in sequence, and the second analog-to-digital converter is connected with the FPGA. The FPGA comprises a direct digital control (DDC)_digital up conversion (DUC) module, a cell failure ratio (CFR) peak clipping module, a digital pre-distortion (DPD) module, a self-adaption module and a memory, wherein an input end of the DDC_DUC module is connected with the first analog-to-digital converter, the DDC_DUC module, the CFR peak clipping module and the DPD module are connected in sequence, the DPD module is connected with the digital-to-analog converter and the self-adaption module, the self-adaption module is connected with the memory, and an output end of the second analog-to-digital converter is connected with the memory. Compared with the prior art, the non-linear distortion compensation device of the power amplifier has the advantages of saving cost of the FPGA, being high in stability, and the like.