Fast recovery diodes | Hitachi Energy
Diodes can be subdivided into two main classes: Rectifier diodes (standard recovery) and fast diodes. Rectifier diodes are generally used for conversion of AC (alternating current) to DC (direct current). While optimized for low conduction losses, Rectifier diodes withstand only moderate dynamic stress in transition from conducting to the blocking state.
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Fast diodes, on the other hand, are companion devices to switches in DC to AC conversion. Every switch (GTO, IGCT or IGBT) requires a complementary diode (e.g. for "free-wheeling" reactive power) in order to enable operation of the DC-AC conversion system with inductive loads.
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Fast diodes are optimized to accept high dynamic stress (fast transition from conducting to blocking state). However, they generally have higher conduction losses than rectifier diodes. For every switch family (GTO, IGCT and IGBT), we offer fast diodes that are optimized for the switch application.
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What Is Schottky As Fast Recovery Diode
What Is Schottky As Fast Recovery Diode
In the realm of electronic components, diodes play a crucial role in various circuits, from power supplies to switching applications. Two types of diodes that stand out for their performance and efficiency are Schottky diodes and Fast Recovery Epitaxial Diodes (FREDs). Duken, a leading manufacturer in the electronics industry, offers high-quality Schottky and FRED diodes that meet the demanding requirements of modern electronic systems. This article delves into the characteristics and applications of these diodes, highlighting the advantages of Duken's products.
Understanding Schottky Diodes
Schottky diodes, also known as Schottky barrier diodes, are widely recognized for their fast switching speeds and low forward voltage drop. These properties make them ideal for applications where high efficiency and minimal power loss are critical.
Key Features of Schottky Diodes
Low Forward Voltage Drop: Schottky diodes typically have a forward voltage drop (Vf) of around 0.2 to 0.3 volts, which is much lower than the 0.7 volts of standard silicon diodes. This low Vf reduces power dissipation and increases overall system efficiency.
Fast Switching Speed: Schottky diodes have a very short reverse recovery time (trr), often less than 10 nanoseconds. This fast switching capability makes them suitable for high-frequency applications.
High Reverse Current: One downside of Schottky diodes is their higher reverse leakage current compared to other diodes. However, advancements in technology have significantly reduced this issue, making them viable for a wide range of applications.
Applications of Schottky Diodes
Power Supplies: Schottky diodes are commonly used in power supplies, particularly in the output rectification stage of switch-mode power supplies (SMPS). Their low forward voltage drop reduces power losses and improves efficiency.
Solar Panels: In solar panel systems, Schottky diodes are used as bypass diodes to prevent reverse current flow and protect the panels from damage.
RF Circuits: Due to their fast switching speed, Schottky diodes are used in radio frequency (RF) circuits for signal detection and mixing.
Duken's Schottky Diodes
Duken offers a range of Schottky diodes that are designed to meet the highest standards of performance and reliability. These diodes are manufactured using advanced semiconductor technologies to ensure low forward voltage drops, fast switching speeds, and minimal reverse leakage currents.
Understanding Fast Recovery Epitaxial Diodes (FREDs)
Fast Recovery Epitaxial Diodes (FREDs) are another type of diode known for their rapid turn-off characteristics. Unlike Schottky diodes, FREDs are made from silicon and have a reverse recovery time that is significantly shorter than standard diodes.
Key Features of FREDs
Short Reverse Recovery Time: FREDs have a reverse recovery time (trr) that is typically less than 50 nanoseconds, making them suitable for high-frequency switching applications.
Low Reverse Leakage Current: Compared to Schottky diodes, FREDs have a much lower reverse leakage current, which reduces power losses and improves reliability.
High Reverse Blocking Voltage: FREDs can handle higher reverse voltages, making them ideal for applications where high voltage blocking is required.
Applications of FREDs
Switching Power Supplies: FREDs are widely used in the primary rectification stage of switching power supplies. Their fast recovery time and low reverse leakage current improve the efficiency and reliability of these systems.
Motor Control Circuits: In motor control applications, FREDs are used in flyback diodes to protect the circuit from voltage spikes caused by inductive loads.
Inductive Loads: FREDs are also used in circuits with inductive loads, such as transformers and solenoids, to prevent damage from back EMF.
Duken's FRED Diodes
Duken's FRED diodes are designed to provide exceptional performance in high-frequency and high-voltage applications. These diodes are manufactured using epitaxial growth techniques to ensure uniform doping and precise control over the diode's characteristics.
Advantages of Duken's Diodes
High Reliability: Duken's diodes are rigorously tested to ensure high reliability and long lifespan. They are designed to withstand harsh operating conditions and provide consistent performance.
Wide Operating Temperature Range: Both Schottky and FRED diodes from Duken can operate over a wide temperature range, making them suitable for use in various environments.
Comprehensive Product Line: Duken offers a wide range of diodes with different voltage and current ratings, ensuring that customers can find the right product for their specific needs.
Technical Support: Duken provides comprehensive technical support, including application notes, datasheets, and expert advice, to help customers integrate their diodes into their designs.
Case Studies and Applications
Case Study 1: High-Efficiency Power Supply
A manufacturer of high-efficiency power supplies needed diodes with low forward voltage drops and fast switching speeds. By using Duken's Schottky diodes, the manufacturer achieved a significant reduction in power losses and improved the overall efficiency of their power supplies.
Case Study 2: Motor Control System
An industrial automation company required diodes with fast reverse recovery times and low reverse leakage currents for their motor control systems. Duken's FRED diodes met these requirements, resulting in more reliable and efficient motor control circuits.
Duken is a trusted name in the electronics industry, offering high-quality Schottky diodes and Fast Recovery Epitaxial Diodes (FREDs) that meet the demanding requirements of modern electronic systems. Whether you need diodes for power supplies, motor control circuits, or RF applications, Duken has the solutions you need. Choose Duken for reliable, efficient, and high-performance diodes that will enhance the functionality and reliability of your electronic designs. Contact Duken today to explore their extensive product range and technical support services.
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