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Quasi-Resonant, Zero-Current Switching DC/DC Converters

June 7, 2004 by Staff
Figure 1. Diagram of a quasi-resonant, zero-current switching DC/DC converter.{toggle author}Switching converters were introduced in the 1960s to achieve the reductions in size and weight promised by higher than line frequency operation. Initial products had switching frequencies of 20 - 30 kHz. By the late 1970s, with the advent of component improvements such as high-speed transistors, frequencies over 100 kHz were being achieved. Unfortunately, switching-related losses, which also increased with frequency, were becoming prohibitively high. Against this backdrop, the quasi-resonant, zero-current switching (ZCS) DC/DC converter was introduced with switching frequencies of 1 MHz, overcoming the frequency-related loss barrier. Each switch cycle delivers a quantized packet of energy to the converter output, with each switch turn-on and turn-off occurring at zero current, resulting in switch losses related only to current conduction, independent of frequency.
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Gavazzi distributes Danaher controls

June 7, 2004 by Staff
Danaher counters, relays. controllers, PID. MISSISSAUGA, Ont. – Carlo Gavazzi Inc. has been appointed the Canadian master distributor for Danaher Controls. The product offering includes electronic counters, time delay relays, process controllers, and PID temperature controllers. These products complement Carlo…
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Passives distibutor helps keep costs in check

June 7, 2004 by Staff
TTI staff in Woodbridge, Ont.: From top, l-r, Dan Heath, Scott Neilson, Dave Meloff, Mike Zarycki, Tony Piacente, Bill Cunningham, Tom Andrus, Jules Marchildon, Carmela Visconti, Brian Wambolt, and Lisa Crandall.{toggle author}For just about any type of business, one of the most prevalent means of cost cutting in today's global economy is reducing transaction costs. For OEMs, that often means reducing the number of candidates on their supplier lists.
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Industry Leaders Gather to Discuss RFID Standards, Cost

June 7, 2004 by Staff
MARKHAM, Ont. -? Industry leaders gathered here in April for Canada’s first radio frequency identification (RFID) conference, in an effort to clarify some of the technical issues and business concerns surrounding the adoption of a technology some believe will have an impact similar to that of the integrated circuit.Organized and hosted by RFID distributor and system integrator R. Moroz Ltd. of Markham, Ont. the two-day event attracted over 250 delegates from retail, banking, manufacturing, and supply chain sectors across the country. RFID is the fastest growing part of R. Moroz’s business, says company president, Bob Moroz. "Last year the RFID side experienced 400 per cent growth, and we forecast two to 300 per cent growth this year," Moroz said.
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Microwave relay modules

June 7, 2004 by Staff
The control and interface features of the SMIPII family have enabled a modular off-the-shelf approach for microwave switching applications, without sacrificing critical performance requirements.
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5PPM thin film chip resistors

June 7, 2004 by Staff
Nichrome thin film chip resistors, the RNC series provide tolerances down to 0.01% and temperatures coefficients to +/- 5ppm per ∞C.
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Snap acting micro-switch

June 7, 2004 by Staff
Snap action micro-switch is rated at 22 Amps at 125/250 VAC. Applications for the high current snap switch include motor controls, locking mechanisms, or any other compact higher current requirement.
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Die cast backshells feature single- or dual-cable entry

June 7, 2004 by Staff
A range of die cast backshells form part of the Amplimite D-subminiature range connector family, feature two cable entries.
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Control indicator module SCADA compatible

June 7, 2004 by Staff
This control indicator module (CIM) contains a SCADA interface for remote control and monitoring of power circuit breakers and reclosers.
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Tantalum capacitors

June 7, 2004 by Staff
Kemet has added 67 new parts to its tantalum-Mn02 and organic tantalum-polymer KO-Cap series. This expands the existing product portfolio to include 53 new KO part types, 40 of which are low ESR options.
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Chinese cords approved

June 7, 2004 by Staff
The Chinese 10 amp power cord part number 86517050 comes with the molded Chinese plug and 2.5 meters of 3 x 1.00mm2 international cable.
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Non-metallic hose clamps

June 7, 2004 by Staff
Acetal tube and hose clamps are often used in place of stainless clamps as they do not rust, are non-conducting and stable in a variety of chemical salts, alcohols, oils, greases, gasoline, et cetera.