TDK Announces Extension of 5 Year Warranty

TDK Corporation announces the introduction of 50W models to the five year warranty TDK-Lambda RWS-B series of AC-DC power supplies, designed to provide solid performance at an economical price. The product line up now has five power levels and compact case sizes, including 100, 150, 300 and 600W.

Operating from a universal input of 47-63Hz, 85-265Vac (300Vac for 5 seconds), the

RWS50-B series is available with nominal outputs of 5, 12, 24 and 48Vdc with an adjustment range of a minimum of +/-10%. The series is designed to meet a wide range of applications, including industrial, test & measurement, broadcast, communications and LED signage.

The convection cooled 50W models operate from -10oC to 70 oC with derating above 40 oC. In addition over voltage and over current protection is included.

High operating efficiencies of up to 88% reduce internal waste heat and component temperatures, resulting in electrolytic capacitor service life ratings of at least ten years.

The TDK-Lambda RWS-B series is certified to the safety standards of UL/CSA 60950-1, UL508 (on certain models), is CE marked according to the Low Voltage, RoHS2 Directives, and additionally evaluated to EN 60950-1. All models offer curve B conducted and radiated performance to EN55011/EN55022-B, FCC class B and VCCI-B.

Full SiC & Hybrid SiC IGBTs & IPMs

Powerex and Mitsubishi continue to expand their product offering with the newest power semiconductor technology, Silicon Carbide. SiC offers significant advantages over Silicon (Si) in power applications requiring low losses, high frequency switching, and/or high temperature environments.

Powerex/Mitsubishi offer a full line of Silicon Carbide (SiC) modules to serve a wide

range of applications. SiC hybrid modules (Si IGBT + SiC Schottky diode) and full SiC

modules (SiC MOSFET + SiC Schottky diode) are available for new, very high

efficiency designs or to achieve significant loss reduction in existing designs. Our

extensive SiC module lineup supports applications including:

 Small inverters for HVAC

 High power inverters for traction and renewable energy applications

 High frequency inverters for medical and welding applications

SiC hybrid modules offer ~45% reduction in power loss vs. Si counterparts due to

lower turn-on losses, lower V, and effective reduction of diode reverse recovery

losses to zero.

Full SiC modules offer ~70% reduction in power loss vs. Si counterparts due to

switching efficiency of MOSFET technology as well as reduced diode losses.

Further, use of full SiC modules results in ~60% module size reduction vs. traditional Si.

TDK- Cathodic Protection Using Active Corrosion Control

To avoid corrosion in large metallic structures, passive cathodic protection is widely employed. Such structures include steel used as reinforcement in concrete buildings, bridges, piers, pipelines, offshore platforms and ships. Basically the steel in the structure is made the “cathode”and a more easily corrodible “sacrificial” metal is connected to it, acting as the “anode”. The chemical reaction between the two metals generates an electrical current. The sacrificial metal then corrodes, protecting the original structure. Eventually that metal part has to be replaced, like the rod in most domestic water heaters. For both environmental and operating cost reasons, the traditional passive protection is being replaced by active corrosion control. In the ‘active’ method, a sophisticated electronic current control system is used to inject a reverse current to that generated from corrosion to protect the structure. Since current flow is closely related to the flow of charge over time (I = dQ/dt), having constant current control allows the user to accurately control the process. This is also known as impressed current cathodic protection (ICCP)

Active corrosion control was initially discovered in the early 1800s, but was unsuccessful due to the lack of suitable materials and current source.In larger systems like pipelines, the passive anodes cannot deliver enough current to provide protection, and sophisticated monitoring and control is often needed.The initial cost of an active system is higher, but in the long term, the environmental & maintenance benefits outweigh this.TDK-Lambda’s new Z+ series of 200 to 800W programmable power supplies offer a wide range of models and options suitable for active corrosion systems. The series can operate in constant current mode with currents ranging from 2A to 72A. In addition, the units can be remotely programmed and monitored using a variety of isolated analog and digital interfaces, including RS232/485, IEEE488 and LAN. Up to six units can be paralleled to supply additional current.