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Related Concept Videos

Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
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Bridge rectifier01:24

Bridge rectifier

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The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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Half wave rectifier01:20

Half wave rectifier

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A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
966
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

113
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
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Full wave rectifier01:22

Full wave rectifier

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A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
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Related Experiment Video

Updated: Jun 13, 2025

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
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A 13.56-MHz 93.5%-Efficiency Optimal On/Off Timing Tracking Active Rectifier With Digital Feedback-Based Adaptive

Jisan Ahn, Hyun-Su Lee, Kyeongho Eom

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    |September 11, 2024
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    Summary

    This adaptive active rectifier uses digital feedback delay controllers (DFDC) for rapid optimization of on/off timing, enhancing power conversion efficiency (PCE) and voltage conversion ratio (VCR) under varying conditions.

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    Area of Science:

    • Electrical Engineering
    • Power Electronics
    • Integrated Circuit Design

    Background:

    • Active rectifiers are crucial for efficient power conversion.
    • Conventional designs face challenges with input voltage and load variations.
    • Optimizing switching timing is key to improving performance.

    Purpose of the Study:

    • To present an adaptive active rectifier with digital feedback delay controllers (DFDC).
    • To improve tracking of optimal on/off timing against dynamic operating conditions.
    • To enhance voltage conversion ratio (VCR) and power conversion efficiency (PCE).

    Main Methods:

    • Employed dynamically controlled coarse/fine delay lines instead of static comparators.
    • Implemented a dual-loop digital feedback system with a 13.56-MHz loop bandwidth.
    • Integrated a real-time power-saving mode control to minimize dynamic power loss.

    Main Results:

    • Achieved a peak power conversion efficiency (PCE) of 93.5%.
    • Reached a peak voltage conversion ratio (VCR) of 96.3%.
    • Demonstrated effective operation across input voltages (1.7-2.6 V) and load ranges (0.33-2.2 kΩ).

    Conclusions:

    • The proposed adaptive active rectifier with DFDC effectively optimizes switching timing.
    • The design offers significant improvements in PCE and VCR.
    • The system enables efficient power management and reduced dynamic power loss.