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POWER SUPLIES ANN_ingenieur_91x277_Mise en page 1 29.10.14 15:45 Page1 THE ORIGINAL MEDICAL PUSH-PULL CONNECTOR SEE US IN HALL B4 BOOTH 267 11-14 NOVEMBER 2014 LEMO SA - Switzerland Phone: (+41 21) 695 16 00 info@lemo.com More than 75'000 connector combinations The modular design of LEMO products provides more than 75'000 different combinations of connectors with a large choice of contact configurations: High and low voltage Coaxial and triaxial Quadrax Thermocouple Fibre optic Fluidic and pneumatic Hybrid Custom solutions Cable assembly Contact your local partner on www.lemo.com process which greatly improves the manufacturability for mass production and reduces the system cost. The components saving and the layout optimization imply a material cost reduction of about 30%, in a dimensions decrease of 30% and in a 35% lighter machine than a commercial solution. A straightforward benchmarking test was performed running this Full-Bridge welding platform at 100 kHz to check its performance at high frequency operation. The test scope Fig. 4: (a) 3.5kW Full-Bridge welding machine demonstrator and (b) related waveforms at time scale 2μs/div. Red waveform, IGBT VCE at 100V/div. Green waveform, high frequency transformer primary side current at 20A/div. is to measure the maximum output current capability while maintaining the same IGBT temperature swing between case and ambient. At the same time, system efficiency and maximum Collector-Emitter and Gate-Emitter Voltage overshoots are monitored. For a correct comparison, the driving setup is the same until reaching system instability or a fault is triggered. The results of the test are summarized in Table 1. At 100kHz operating frequency, Trenchstop 5 shows a performance not to be reached by any other comparable device. H5 IGBT provides 30% higher output current than the best alternative and delivers 70% more output DC current compared to second best option, meanwhile avoiding additional effort to smooth driving waveforms. H5 IGBT reveals 1% to 3% higher efficiency than any other candidate at maximum output current level of the welding machine. This allows the welding machine to grant a higher energy efficiency grade. The slightly higher Collector-Emitter voltage overshoot, as found in the Half-Bridge case, does not cause issues in most of the cases. First, the absolute value of this overshooting is limited to 430V at 200A, and second, H5 IGBT is characterized by additional 50V margin on the breakdown voltage compared to most of the available devices. Table 1: Benchmarking test results on Full-Bridge demonstrator. www.electronics-eetimes.com Electronic Engineering Times Europe November 2014 33


EETE NOV 2014
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