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Related Concept Videos

Control Systems01:10

Control Systems

1.2K
Control systems are everywhere in contemporary society, influencing diverse applications from aerospace to automated manufacturing. These systems can be found naturally within biological processes, such as blood sugar regulation and heart rate adjustment in response to stress, as well as in man-made systems like elevators and automated vehicles. A control system is essentially a network of subsystems and processes that collaboratively convert specific inputs into desired outputs.
At the heart...
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Control Systems: Applications01:25

Control Systems: Applications

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Electrical engineering plays a pivotal role in our daily lives, with control systems at the heart of many applications, from home appliances to sophisticated space shuttles. Control systems manage and regulate the behavior of devices and processes, ensuring they function safely, correctly, and efficiently.
In modern vehicles, control systems manage various functions to enhance performance and safety. The steering wheel and accelerator are primary inputs in a car's control system. The...
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Control System Problem01:21

Control System Problem

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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
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Open and closed-loop control systems01:17

Open and closed-loop control systems

813
Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal...
813
Multi-input and Multi-variable systems01:22

Multi-input and Multi-variable systems

129
Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
In the absence...
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Feedback control systems01:26

Feedback control systems

346
Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
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Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
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A many-channel FPGA control system.

Daniel T Schussheim1, Kurt Gibble1

  • 1Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

The Review of Scientific Instruments
|August 2, 2023
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Summary
This summary is machine-generated.

A new field-programmable gate array (FPGA) system offers high-speed, many-channel experiment control. It efficiently manages multiple servo loops and demonstrates novel filters for advanced applications.

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Area of Science:

  • Experimental Physics
  • Control Systems Engineering
  • Embedded Systems Design

Background:

  • Advanced experimental control systems are crucial for high-precision scientific research.
  • Existing systems often face limitations in channel count, speed, and resource efficiency.
  • Field-programmable gate arrays (FPGAs) offer a flexible platform for developing high-performance control solutions.

Purpose of the Study:

  • To develop and characterize a many-channel experiment control system utilizing FPGA technology.
  • To demonstrate the system's capability in managing multiple high-speed servo loops and complex waveform generation.
  • To present efficient digital filter implementations for resource-constrained FPGA environments.

Main Methods:

  • Implementation of a custom FPGA-based control system with high-resolution analog I/O and digital interfaces.
  • Development of low-latency (30 ns) infinite-impulse-response (IIR) proportional-integral-differential filters using bit-shifts and additions.
  • Integration of a touchscreen interface for real-time experiment monitoring and control.
  • Demonstration of applications including laser locking, temperature servos, and arbitrary waveform generation.

Main Results:

  • The FPGA system provides 10 analog input (100 MS/s, 16-bit) and 14 analog output (100 MS/s, 16-bit) channels.
  • Support for up to ten servo loops with 155 ns latency and MHz bandwidths, plus additional lower-bandwidth servos.
  • Demonstrated IIR filters achieve 30 ns latency, conserving FPGA resources compared to multiplier-based designs.
  • Successful implementation of Hänsch-Couillaud laser locks, variable duty cycle temperature servos, and synchronized arbitrary waveform generation.

Conclusions:

  • The developed FPGA system provides a powerful and versatile platform for high-channel-count, high-speed experiment control.
  • Efficient IIR filter designs enable complex control tasks on a single FPGA, reducing hardware requirements.
  • The system's flexibility and performance are suitable for a range of demanding scientific applications.