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Half wave rectifier

Half wave rectifier

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.

Full wave rectifier

Full wave rectifier

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.

Voltage Doubler Circuit

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

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.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...

Generator Voltage Control

Generator Voltage Control

Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...

MOSFET Amplifiers

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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2.4 GHz GaN HEMT Class-F Synchronous Rectifier Using an Independent Second Harmonic Tuning Circuit.

Jongyun Na¹, Sang-Hwa Yi², Jaekyung Shin¹

¹College of Information and Communication Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon 16419, Korea.

Sensors (Basel, Switzerland)

|March 6, 2021

Summary

This summary is machine-generated.

This study presents a novel class-F synchronous rectifier for 2.4 GHz wireless power transmission. The design achieves a peak RF-to-DC conversion efficiency of 69.6% using a GaN HEMT, enhancing power receiver performance.

Keywords:

GaN HEMT device RF synchronous rectifier class-F power amplifier independent harmonic tuning circuit time reversal duality wireless power transmission

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Area of Science:

Electrical Engineering
RF and Microwave Engineering
Power Electronics

Background:

Wireless power transmission (WPT) systems require efficient power receivers.
Synchronous rectifiers are crucial components in WPT for high efficiency.
Class-F amplifiers offer high efficiency but require careful harmonic tuning.

Purpose of the Study:

To propose and implement a class-F synchronous rectifier for 2.4 GHz WPT systems.
To leverage time reversal duality for rectifier design based on a class-F power amplifier.
To optimize rectifier performance using an independent second harmonic tuning circuit.

Main Methods:

Designed a class-F synchronous rectifier by inverting the RF ports of a class-F power amplifier.
Incorporated an independent second harmonic tuning circuit in matching networks.
Implemented the rectifier using a 6 W Gallium Nitride High Electron Mobility Transistor (GaN HEMT).

Main Results:

Achieved a peak RF-to-DC conversion efficiency of 69.6%.
Delivered a DC output power of approximately 7.8 W.
The associated class-F power amplifier demonstrated a peak drain efficiency of 72.8%.

Conclusions:

The proposed class-F synchronous rectifier is effective for 2.4 GHz WPT receivers.
The independent second harmonic tuning circuit enables optimized impedance matching for improved efficiency.
The GaN HEMT technology facilitates high-performance rectifier implementation in WPT systems.