Current Limiting Devices (CLD) for improved performance in surge protection

Continuing to improve the support to customers adopting Current Limiting Devices (CLD) for their advanced surge and lightning protection solutions, CALY Technologies is proud to announce the release of Application Note AN-00038-17 “Improving Performance of Surge Protection Circuits with Current Limiting Devices.”

This application note demonstrates how the use of Current Limiting Devices (CLD) in surge and lightning protection circuits enables surpassing the performance offered by standard solutions, bringing unprecedented protection and compactness levels. This is illustrated with a widely-used circuit topology, the π-protection circuit, using a Gas Discharge Tube (GDT) and a Transient Voltage Suppressor (TVS).

CLD vs RES protection circuit

With such CLD-based surge and lightning protection circuit, the current through the TVS as well as its dissipated power remain at very low values (smaller and cheaper TVS), and are almost independent of the amplitude of the aggression surge. Additionally, the load voltage presents a predictable and smooth behavior, showing no spike, and remains independent of the amplitude of the aggressing surge.

graph CLD vs RES
Typical waveforms and conduction phases in the π protection circuit during a surge event using classical solution or Current Limiting devices

This Application Note is aimed at customers designing and deploying lightning and surge protection applications for audio/video, data and communication networks, by providing an application schematic and evidence on how the use of CLDs greatly improves performance.

For more information contact CALY Technologies or have a look at our CLD web page.

Meet us at the 52nd International Paris Air Show Le Bourget, June 19-25 2017

Paris Air Show - Le bourget 2017

CALY Technologies will be taking part to 52nd International Paris Air Show to be held in Le Bourget , France, on 19-25 June.

This event is the world’s oldest and largest aviation show and has become one of the industry’s major networking events.
Open to both professionals and the general public, the Paris Air Show will bring together all the industry’s players across the globe to showcase the latest technological innovations.
We will be highlighting our product line of SiC Current Limiting Devices (CLD) for lightning protection applications and presenting our demo boards featuring our CLD products.

Come and meet us at booth  FG156 in Hall 2B.

LTSpice Electro-thermal Model of 1200V, 2 Ohm SiC CLD KE12LS200

To ease the adoption of its  Silicon Carbide (SiC) Current Limiting Devices (CLD), CALY Technologies makes available for download from its website an Electro-thermal model of the KE12LS200 SiC CLD for simulations under the LTSpice environment.

This model enables transient as well as steady-state electrical simulations. In an electro-thermal model electrical parameters are updated at every simulation step based on the actual junction temperature. At its turn, device junction temperature depends on the power being dissipate in the device.

Application note AN-00029-17 is also available, which describes the derivation of the SiC CLD electro-thermal model and how to use it in LTSpice. The Application Note also provides instructions on how to import the model into LTSpice, and finally compares test and simulations results.

SiC CLD LTSpice model and symbol Results of electro-thermal LTSpice simulations and experimental data

These model and Application Note greatly help customers with the design and deployment of SiC CLD-based lightning and surge protection applications.

CALY Technologies Announces New 4kV, 2A SiC Schottky Diode

Villeurbanne-France, January, 2017: CALY Technologies, manufacturer and supplier of specialty SiC devices, announces the release of a 4kV, 2A SiC Schottky diode for high-efficiency power conversion applications such as rectifiers, voltage multipliers and boost converters.
This device is part of a family of SiC Schottky diodes targeting highly demanding markets such as Medical, Data Centers, Transportation and EV, Industrial and Well Drilling (Geothermal and Oil&Gas).
Its outstanding characteristics contribute to reduce losses, enabling size,weight and cost reductions, while operating under severe conditions thanks to the robustness and reliability offered by its construction using Silicon Carbide (SiC).
Schottky diodes from CALY Technologies are available as packaged devices but also as bare dies. Contact us to know about available metallizations.

Visit our Schottky Diodes page or request more information through our email address


New Family of SiC Current Limiters / Regulators


Villuerbanne-France, January 25, 2017: CALY Technologies, manufacturer and supplier of specialty SiC devices, releases a family of SiC Current Limiting Devices (CLD) intended for protection and current regulation applications. CLD_News_Schematics

CLDs are two terminal, SiC, monolithic, discrete devices able to keep the current through them constant once their voltage drop goes above a given threshold around 7V to 10V. For lower voltages, CLDs behave like a small constant resistor.
Depending upon construction, CLDs can be unidirectional or bidirectional, allowing their use in DC as well as AC applications.
Unlike JFETs, CLDs are optimized to sustain much higher overload (short-circuit) conditions without degradation, even under repetitive stresses with applied voltages up to 1.2kV. Additionally, CLDs are plug-and-play devices as no driving nor any adjustments is needed to be performed by the final user.
Typical CLD applications comprise lightning and surge protections of power or data busses, circuit breaker assistance, constant current battery pack protections and driverless LED current regulation.
Their robustness, thanks to their manufacturing using in Silicon Carbide (SiC) semiconductor, makes them ideally suited for high-reliability markets such us Aerospace, Transportation and EV, Data Centers, Medical and Smart Grid.
CLDs are available as packaged devices but also as bare dies. Contact us to know about available metallizations.
Visit our CLD page or request more information through our email address