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EETE NOVEMBER 2012

DESIGN & PRODUCTS T a s ou tr s n lowable total maximum loss-In the application field,with specific thermal designof the power system, the aldanas explained below.)sIrogeMtnuouclmrePdcfdanIfnran(urS SeePico’scoelectronics.com as the configuration of powersink size, ventilation as wellieeis defined according to heatyltaidmmgolataCllufip.ww-devices, magnetic compow nents etc. At the same time Low Profile from the junction temperature of all .19"ht. the de-rating requirement ofthe power devices must fulfill e.g. 80% of the Tjmax. That means also that the maximum Fig. 4: Efficiency and case temperature (at max allowable power loss per power) comparison in a 1kW PFC test board. device is defined as well. Audio Transformers Take a practical value e.g. Impedance Levels 10 ohms to 250k ohms, 40W for standard TO-247, Power Levels to 3 Watts, Frequency Response ±3db 20Hz to 250Hz. All units manufactured and and the same load condition tested to MIL-PRF-27. QPL Units available. mentioned above (20A square Power & EMI Inductors wave, 50% duty cycle) for a 40A device. The maximum Ideal for Noise, Spike and Power Filtering Applications in Power Supplies, DC-DC operation frequency of High- Converters and Switching Regulators Speed3, with respect to max Pulse Transformers junction temperature 100°C, 10 Nanoseconds to 100 Microseconds. is around 28kHz. ET Rating to 150 Volt Microsecond, Manufactured As a comparison, the new and tested to MIL-PRF-21038. IGBT H5 it could be driven up Multiplex Data Bus to 50kHz. At this frequency Pulse Transformers Fig. 5: Power dissipation as a function of switching the cost and reliability benefit Plug-In units meet the requirements brought by the frequency of QPL-MIL-PRF 21038/27. frequency. Surface units are electrical equivalents increase, like smaller and of QPL-MIL-PRF 21038/27. light-weight magnetic com- DC-DC Converter ponents, as well as possibility Transformers to reduce or even eliminate Input voltages of 5V, 12V, 24V And 48V. electrolytic capacitors in voltages can be supplied). Can be used as self some cases, would defi-laicepS(V003otsegatloVtuptuOdradnat S saturating or linear switching applications. All units nitely overcome the additional manufactured and tested to MIL-PRF-27. design complexity (thermal, 400Hz/800Hz layout optimization etc). This Power Transformers is extremely important for ap- 0.4 Watts to 150 Watts. Secondary Voltages 5V to plications like solar and UPS, Class S (Class V, 1550C available). where the cost of the passive,5edarG72-FRP-LIMotderutcafunamstinU.V003 components dominate the bill Delivery-Stock toantitiesek of material.To validate the aboveewenouconsiderations, an applicationFig. 6: Efficiency measurement on Solar inverter withqelpmasrof test was carried out on a solar HERIC topology. Courtesy of Fraunhofer ISE. inverter at the Fraunhofer PICO Electronics, Inc. in state-of-the-art inverter design, the sists of 6 duo-pak IGBTs and 2 discrete-Institute ISE. The HERIC topology conAt 20kHz, which is commonly used 143 Sparks Ave. Pelham, N.Y. 10803 total power loss per IGBT dropped from diodes. By replacing the HighSpeed 3 E Mail: info@picoelectronics.com www.picoelectronics.com 32.80 W by HighSpeed 3 to 25.04 W by IGBT with HighSpeed 5 - H5 at 16 kHz, using the H5, that means approximately the peak efficiency is increased by 0.2 Pico Representatives Germany 24% reduction. Moreover, if we replace % to reach 98.3%. ELBV/Electronische Bauelemente Vertrieb the anti-parallel diode with Infineon 2nd In a separate test, the H5 allows to E mail: info@elbv.de Phone: 0049 (0)89 4602852 generation SiC Schottky diode, an- triple the switching frequency (from Fax: 0049 (0)89 46205442 other 11% power loss reduction could 16 to 48 kHz) by keeping the same or Ginsbury Electronics Ltd. be achieved. This allows us to either higher efficiency as previous generationdnalgnE E-mail: rbennett@ginsbury.co.uk increase the system output power by HighSpeed 3 over the entire load range, Phone: 0044 1634 298900 keeping the same device temperature, confirming the simulated results – see Fax: 0044 1634 290904 or to increase the switching frequency, figure 6. 52 Electronic Engineering TimesEurope November 2012 www.electronics-eetimes.com


EETE NOVEMBER 2012
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