Driver Board Research Articles

Design of the CCD-TCD2964BFG Drive and Sampling Based on FPGA

This technology is mainly focused on the charge coupled device (CCD)TCD2964BFG as image sensor and using AD9826 as sampling chip, which introduces a design of driving and sampling circuit based on the FPGA of Altera Corporation. It discusses the design of driving and control timing by using FPGA chip EP4CE30F23C7N technology. Then it describes the design of the CCD driver board and the CCD mounting board in detail. This is a pivotal design to high-precision measurement, color image scanning and so on. Its highest accuracy can be reached 4800DPI with high resolution when it works and its output signal can be more reliable, more stable by being processed by AD9826, so it is very important for high-precision measurement, color image scanning ,etc. While making it into sub-circuit board physical model by using integrated circuit form, meanwhile, it’s very convenient to connect with a variety of FPGA core boards and it can be applied on various occasions by outgoing interface signals. The design is known for its flexibility, high integration, easy to update, convenient to apply and so on. The observed results indicate that the design of driving timing and circuit can meet the normal demands for the color linear CCD.

红外偏振成像系统高速处理模块设计

The high speed imaging processing module based on MWIR cooled 320256 detector, SDRAM memory and other function module circuit was designed for time-sharing type polarization imaging system. Processing module mainly included the driver board connected to detector, processing board with FPGA as its core, system power supply board. The algorithm of blind pixels compensation, nonuniformity correction, plateau histogram equalization and linear mapping were implemented, calibration parameters can be calculated online. Image processing module can realize the synchronization switch, integral time adjusted continuously, frame rate up to 200 fps, and output 320256 pixels high quality infrared image, meeting the requirement of the polarization imaging system to detect moving objects. Infrared polarization imaging experiments on plastic cups with groove were carried out, effective Stokes parameter images were extracted from the polarization images, and the significant polarization properties were observed. The processing module can be applied to the detection of space target, mine detection, maritime search and camouflage target detection.

Development of obstacle- avoiding robots using RF technology

Purpose In the capricious span of this current millennium, there is a deafening roar in the demand for modernization in the sector of robotics and technology to perform tasks in an intelligent manner. Thus to replenish such necessities, the innovations and inventions of researchers came forward as blessings on human civilization due to their sheer ingenuity and relentless and arduous efforts with each nanosecond passed from now onwards. With the same sublime goal, same resilient endeavor, same aggressive demeanor, the paper on obstacle avoiding robots comes forward. The paper aims to discuss these issues. Design/methodology/approach It exhibits how to control a differential drive robot wirelessly by analog thumb joystick module with added obstacle avoidance protection. The variations made by the user in the control of analog thumb joystick module are fed as input to the Atmega 16 microcontroller board which further transfers it wirelessly to the robot through the radio frequency (RF) transmitting module. The Arduino mega microcontroller equipped to the robot cross-checks the instructions gained through the RF receiving module and provides power accordingly to the geared motors through the motor driver board for movement along with scanning the environment to avoid obstacles present thereby. Findings The improvisation of RF technology in controlling the obstacle avoiding robot has enhanced its application and reliability by leaps and bounds reducing the anxiety and tension of the human controller. Originality/value With more advanced algorithm and genuine deployment sensors, the idea behind this research work can be used in humanoid robots which can help immensely in going to the extremely dangerous terrains, war zones and also in human rescue operations.

Co-integrating thermal and hemodynamic imaging for physiological monitoring

Photoplethysmographic imaging (PPGI) has gained popularity fornon-intrusive cardiovascular monitoring. However, certain symptoms(e.g., fever) may not be easily detectable using cardiovascularbiomarkers. Here, we investigate the co-integration of PPGIand thermal imaging to create a non-contact, widefield, multimodalphysiological monitoring system. To achieve strong PPGI performance,high-power infrared LED stability was investigated by evaluatingtwo LED driver boards. Results show that the multimodalimaging system was able to acquire spatially consistent hemodynamicpulsatility and heat distributions in a case study. This multimodalsystem may lead to improved systemic disease detectionand monitoring.

Review of Commercial GaN Power Devices and GaN-Based Converter Design Challenges

Gallium nitride (GaN) power devices are an emerging technology that have only recently become available commercially. This new technology enables the design of converters at higher frequencies and efficiencies than those achievable with conventional Si devices. This paper reviews the characteristics and commercial status of both vertical and lateral GaN power devices, providing the background necessary to understand the significance of these recent developments. In addition, the challenges encountered in GaN-based converter design are considered, such as the consequences of faster switching on gate driver design and board layout. Other issues include the unique reverse conduction behavior, dynamic $R_{\mathrm {{ds}},\mathrm {{on}}}$ , breakdown mechanisms, thermal design, device availability, and reliability qualification. This review will help prepare the reader to effectively design GaN-based converters, as these devices become increasingly available on a commercial scale.

Acoustic micro-vortexing of fluids, particles and cells in disposable microfluidic chips.

We demonstrate an acoustic platform for micro-vortexing in disposable polymer microfluidic chips with small-volume (20 μl) reaction chambers. The described method is demonstrated for a variety of standard vortexing functions, including mixing of fluids, re-suspension of a pellet of magnetic beads collected by a magnet placed on the chip, and lysis of cells for DNA extraction. The device is based on a modified Langevin-type ultrasonic transducer with an exponential horn for efficient coupling into the microfluidic chip, which is actuated by a low-cost fixed-frequency electronic driver board. The transducer is optimized by numerical modelling, and different demonstrated vortexing functions are realized by actuating the transducer for varying times; from fractions of a second for fluid mixing, to half a minute for cell lysis and DNA extraction. The platform can be operated during 1 min below physiological temperatures with the help of a PC fan, a Peltier element and an aluminum heat sink acting as the chip holder. As a proof of principle for sample preparation applications, we demonstrate on-chip cell lysis and DNA extraction within 25 s. The method is of interest for automating and chip-integrating sample preparation procedures in various biological assays.

Deployment of the CMS Tracker AMC as backend for the CMS pixel detector

The silicon pixel detector of the CMS experiment at CERN will be replaced with an upgraded version at the beginning of 2017 with the new detector featuring an additional barrel- and end-cap layer resulting in an increased number of fully digital read-out links running at 400 Mbps. New versions of the PSI46 Read-Out Chip and Token Bit Manager have been developed to operate at higher rates and reduce data loss. Front-End Controller and Front-End Driver boards, based on the μTCA compatible CMS Tracker AMC, a variant of the FC7 card, are being developed using different mezzanines to host the optical links for the digital read-out and control system. An overview of the system architecture is presented, with details on the implementation, and first results obtained from test systems.

Design of Permanent Magnet Synchronous Motor Control Chip Based on SOPC

This article presents a program for permanent magnet synchronous motor (PMSM) vector control chip design based on SOPC technology. Microprocessor NIOSII and hardware arithmetic unit such as CORDIC and SVPWM, were all integrated in a FPGA by using bus interconnect and IP reuse technology, so that became a dedicated control chip of PMSM. Using hardware and software co-design methods, the chip was designed on Altera's CycloneIII FPGA, chip design flexibility and use small resource. Finally, combined with the power driver board achieved the dual closed-loop control of PMSM. The results show that system have a good performance, which proved that system can be well controlled by the designed IC.

The Design of Dynamic Target Echo Intermediate-Frequency Signal Source of Radar

The dynamic target echo intermediate-frequency signal source can be used to detecting and repairing receiving system, signal processing system, display system of conventional radar. The output frequency which conducted by the signal source can be adjusted. The range of output signal frequency basically covers different types of radar, which has important practical application value on the maintenance of radar. The dynamic target echo intermediate-frequency signal source is make up of source processing unit, intermediate-frequency unit, monitoring unit, the time reference source, input and output driver board and power supply pulse generation. Pulse processing unit in the signal source is in the core status.

The Research of Self-Balancing Vehicle Based on Posture Sensor System

The main subject of this thesis is to study a uneasily two-wheeled self-balancing vehicle system. Two tires are placed on two sides of the body parallel in this system . Controlling the rotation of two DC motors can achieve the goal of walking upright. The circuit part is mainly made up by attitude sensors parts (including Gyroscope and Accelerometer), control circuit and the driver board. Attitude sensors measure the tilt angle and the rate of change of inclination of vehicle, and then the controller calculate the responding data and finally drive two DC motors forward or backward to produce forward or backward acceleration to make the car balancing.

Switched Reluctance Motors Control

A current controlled switched reluctance motor (SRM) drive for variable speed applications with efficiency optimization is presented. A robust, modular and flexible prototyping SRM drives is proposed. It is composed of a power electronic block, a driver board, a measurement and interface board and a DSP controller board. Firing angles are computed online, the turn-on is calculated by means of the Boses rule, and the turn-off is calculated using the general theory of the optimal turn-off angle proposed by Gribble. In steady state operation, tie initial selection of firing angles is fine-tuned by means of an algorithm that minimizes the input power of the drive. A 6/4 switched reluctance motor drive prototype was tested and the experimental results show an improvement in online efficiency, a good steady-state performance and no deterioration in the dynamic response. An efficiency comparison with a commercial vector-controlled induction motor drive of the same size is also included.

A fast UV-LED QRdriver for calibration system for SiPM based scintillator HCAL detector

We report on latest version of the calibration and monitoring system developed for the scintillator tile hadron calorimeter (AHCAL) for the ILC. System is based on original fast (3.5 ns pulse width) and precise LED driver board called QMB. One UV-LED can illuminate 72 scintillating tiles with SiPM. Distribution of the light pulses uses notched fibres, developed at our laboratory. All parts of the system are continually upgraded to get better results. The system is flexible to all necessary monitoring and calibration of SiPM detector tasks. It has high dynamic range of precise a few nanosecond pulses. Low intensity LED pulses are needed to obtain SiPM single photoelectron spectra. A routine monitoring of all SiPMs during the test beam operations is achieved with mid-range a fixed-intensity light pulse. The full SiPM response function is cross-checked by varying the light intensity from zero to the saturation level. In calibration systems we developed, we concentrate especially on the aspect a high dynamic range of precise a few nanosecond pulses. Calibration system has been tested with 2.2 m long slab of engineering AHCAL prototype, which uses 864 SiPM embedded in 3 by 3 cm scintillator tiles and represents a part of the biggest foreseen detector using SiPMs.

Simulating the Arm Movements of a Stepper Motor Controlled Pick-and-Place Robot Using the Stepper Motor Model

This paper describes the simulation of arm movements of a stepper motor controlled pick-and-place robot using the mathematical model of a stepper motor. The model includes: a) a model of the stepper model driver board, b) a model of the hybrid stepper motor and load combination, and c) the interconnection of the two models which is used to simulate the motions of the base, shoulder, elbow, and wrist (pitch) motions of the pick-and-place robot. The model is simulated using Simulink and the results of angular displacement from the simulation and actual measurements show good uniformity.

Design and Development of a Control System for Nanofiber Electrospinning

This paper describes the development of a control hardware and software for a nano-fiber electro-spinning system. The hardware consists of motor driver boards, a high DC voltage board, and a main control board. The user interface software on PC is developed using Visual Studio C # 2010 express edition. The motor driver boards are controlled by an ATmega8 microcontroller IC, while the main board is controlled by an ATmega 128 microcontroller IC. Communication between the main board and the motor driver boards uses the inter integrated circuit (I2C), while communication between PC and the main board uses a serial communication at a baud rate of 9,600 bps. The high DC voltage generator is designed to have an output of 0-25 kV. High DC voltage output is configurable by giving a combination of low logic and high impedance into a six bit input. The result show that maximum output of high DC voltage is 25.025 kV with formula of curve is y = 1x – 0.0244 with R2 = 0.9998 and PC software interface can work very well. Polymer flow rate can be configured from PC interface software via I2C connected to the main board. The flow rate y follows the RPM setting x, according to the formula y = 0.954x – 0.0099 with R2 = 1. The results of scanning electron microscope (SEM) for morphology analysis of PVDF copolymer composite nano-fiber shows that the average diameter of the resulted fiber is 136.43 nm, when output high DC voltage is set to 15 kV and speed of syringe pump is set to 5 RPM.

TFT LCD Driver Board Design Based on the AD9985A Chip and the EPM3128A Chip

On the basis of the introduction of the TFT color LCD principle and the analysis of the VGA interface standard, a TFT LCD driver board design program based on the AD9985A chip and the EPM3128A chip is proposed. A system block diagram of the TFT LCD driver board is designed. Then the main circuit design of the system is described in detail, including the power circuit design, the analog interface chip AD9985A circuit design and the programmable logic device EPM3128A circuit design. Finally, the main content of software design are introduced. Practice shows that the design is feasible and effective.

The Application of SG3525 Pulse Width Modulator in Intermediate Frequency Induction Heating Power Supply

In This paper, we introduce a kind of intermediate frequency induction heating power supply integral design based on the pulse width modulator SG3525, analyse SG3525, KA962F driving chip, the main circuit structure and function and realize frequency and occupies emptiescompared independent can be adjusted. The main circuit adopts the series resonant type IGBT half bridge inverter circuit. It outputs pulse with difference of two phases of 180 degrees to the IGBT driver board through the SG3525, IGBT driver board receives the pulse and drive the IGBT main circuit. Circuit adds the limit frequency protection circuit design, so that the heating power supply works in the inductive state. To improve the on-site operation safety.Finally the unit circuit experiment is conducted on the basis of the field experiment, it is proved that the whole design scheme is feasibility by experiments.

Cryogenic applications of commercial electronic components

We have developed a range of techniques useful for constructing analog and digital circuits for operation in a liquid Helium environment (4.2K), using commercially available low power components. The challenges encountered in designing cryogenic electronics include finding components that can function usefully in the cold and possess low enough power dissipation so as not to heat the systems they are designed to measure. From design, test, and integration perspectives it is useful for components to operate similarly at room and cryogenic temperatures; however this is not a necessity. Some of the circuits presented here have been used successfully in the MUSTANG [1] and in the GISMO [2] camera to build a complete digital to analog multiplexer (which will be referred to as the Cryogenic Address Driver board). Many of the circuit elements described are of a more general nature rather than specific to the Cryogenic Address Driver board, and were studied as a part of a more comprehensive approach to addressing a larger set of cryogenic electronic needs.

Experiment Study on Performances of Servo Pump Used in Hydraulic Press Machine

As we known, the energy efficiency of pump-control system is higher than valve-control system. So, using pump-control system to replace valve-control system has a positive meaning to improve the energy efficiency in hydraulic press machine. In order to research the performance of servo pump used in hydraulic press machines, the present study is conducted. First, a test bench for comparison of pump-control and valve-control system is established. In this test bench, the pump of former valve-control system and the servo pump are settled. These two pumps are switched by solenoid to supply oil for the hydraulic system. Then, host PC, target PC, I/O board and other hard-wares are connected. Soft-wares and the corresponding driver board are applied to collect data. In order to test the performances of the pressure, velocity and displacement under the condition of the valve-control system and pump-control system, the two systems are tested with the same working conditions. The performance of repeatability and energy efficiency are also obtained. The results show that it’s feasible to apply servo pump to hydraulic press machine. And under the pump-control condition, the velocity and pressure performance of press machine is more stable.

Rapid High-Precision In Situ Wavelength Calibration for Tunable Lasers Using an Athermal AWG and a PD Array

This letter presents a simple and rapid high-precision in situ calibration technique for tunable superstructure grating distributed Bragg reflector (SSG-DBR) lasers using a laser driver board with an athermal arrayed waveguide grating (AWG) and a photodetector (PD) array. The experiment demonstrates laser calibration for seven wavelength channels completed in 23 s with a precision of <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\pm$</tex> </formula> 0.015 nm. This letter describes the details of the system calibration method, the mode competition detection technique, and the calibration time analyses. The presented technique can also apply to other tunable lasers with suitable modification in the laser driver interfaces. <?Pub _bookmark="" Command="[Quick Mark]"?>

A Conserved Neural Circuit-Based Architecture for Ambulatory and Undulatory Biomimetic Robots

AbstractThe adaptive capabilities of underwater organisms result from layered exteroceptive reflexes responding to gravity, impediment, and hydrodynamic and optical flow. In combination with taxic responses to point sources of sound or chemicals, these reflexes allow reactive autonomy in the most challenging of environments. We are developing a new generation of lobster and lamprey-based robots that operate under control by synaptic networks rather than algorithms. The networks, based on the command neuron, coordinating neuron, and central pattern generator architecture, code sensor input as labeled lines and activate shape memory alloy-based artificial muscles through a simple interface that couples excitation to contraction. We have completed the lamprey-based robot and are adapting this sensor, board, and actuator architecture to a new generation of the lobster-based robot. The networks are constructed from discrete time map-based neurons and synapses and are instantiated on the digital signal processing chip. A sensor board integrates inputs from a short baseline sonar array (for beacon tracking and supervisory control), accelerometer, a compass, antennae, and optionally chemosensors. Actuator control is mediated by pulse-width duty cycle coding generated by the electronic motor neurons and a comparator and power field-effect transistor (FET) system housed on low- and high-current driver boards. These circular boards are stacked in a tubular hull with the processor and batteries. This system can readily mimic the biomechanics of the model organisms by the addition of hydrodynamic control surfaces. The behavioral set results from chaining sequences of exteroceptive reflexes released by sensory feedback from the environment.