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Bridge rectifier

Bridge rectifier

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.
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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.

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.

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Related Experiment Video

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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

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An Integrated Power-Efficient Active Rectifier With Offset-Controlled High Speed Comparators for Inductively Powered

Hyung-Min Lee¹, Maysam Ghovanloo

¹GT-Bionics Lab, School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30308 USA.

IEEE Transactions on Circuits and Systems. I, Regular Papers : a Publication of the IEEE Circuits and Systems Society

|December 17, 2011

Summary

This summary is machine-generated.

This study introduces an active full-wave rectifier using standard CMOS technology for efficient power conversion in high-frequency applications. It achieves a record 80.2% power conversion efficiency (PCE) for inductively powered devices.

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Area of Science:

Electrical Engineering
Integrated Circuit Design
Power Electronics

Background:

Passive rectifiers often exhibit high dropout voltage and low power conversion efficiency (PCE), limiting performance in high-frequency (HF) applications.
Inductively powered devices require efficient power conversion, especially at HF ranges.

Purpose of the Study:

To develop an active full-wave rectifier with offset-controlled comparators for improved PCE in HF applications.
To achieve lower dropout voltage and higher PCE compared to existing passive rectifier solutions.

Main Methods:

Designed and fabricated an active full-wave rectifier using a 0.5-microm standard CMOS process.
Integrated high-speed comparators with built-in offset-control functions to manage switching delays.
Incorporated overvoltage protection (OVP) and back telemetry using detuning and load shift keying (LSK) techniques.

Main Results:

Achieved a power conversion efficiency (PCE) of 80.2% at 13.56 MHz with a 3.8 V peak AC input and 500 Ω load.
Demonstrated significantly lower dropout voltage compared to passive rectifiers.
Successfully tested OVP and back telemetry functionalities.

Conclusions:

The active rectifier offers superior performance, particularly in terms of PCE and dropout voltage, for HF inductively powered devices.
The integrated offset-control comparators effectively enhance forward current and minimize back current, boosting PCE.
The design provides a robust and efficient solution with added safety and communication features.