Appliance Design - February 2008 - (Page 41) COOKING TECHNOLOGY Fig. 4. Single-ended topology for soft switching and typical waveform. typical waveforms are shown in Fig. 4. In contrast to the half-bridge topology, the current waveform is almost triangular (light blue) while the voltage waveform (dark blue) is sinusoidal. However, the IGBT is controlled in a way that it turns on when the voltage has reached the zero level again. This ensures a zero voltage switching during turn-on. The resulting voltage oscillation during turn-off leads to a low voltage level across the IGBT. The tail current therefore does not dominate the turn-off energy and the turn-off transition generates little losses. Soft-switching applications Infineon’s newest RC-IGBT IHW30N160R in 1,600 V/30 A addresses soft-switching applications such as induction cookers in single-ended topologies that need much higher breakdown voltages. The 1,200 V device is still the most common IGBT voltage class used in these applications. A higher breakdown voltage gives the manufacturer a higher safety margin against over-voltage peaks that may occur for different reasons, such as net instabilities of the power source. To account for a higher breakdown voltage, the thickness of the IGBT has to be increased to lower the electric field from the junction to the backside of the IGBT. This increase in Customers everywhere depend on our igniters. No matter where you are, from the North Pole to the South Seas, Saint-Gobain has an igniter to meet your needs. Our igniters deliver dependable performance in gas appliances of every description, from furnaces and boilers to ranges, cooktops, and dryers. Made with a state-of-the-art ceramic, our igniters offer physical and thermal strength, electrical stability, easy handling, and simple installation. They are available in virtually every voltage, including 12V, 24V, 120V, and 240V. Slotless MINI-IGNITER™ CRYSTAR® Igniter For more information about Saint-Gobain Igniter Products – makers of the original Norton Igniter – call us at 603-673-2681 or visit us at www.igniterproducts.saint-gobain.com. After all, when it comes to reliability, our igniters beat the others cold. For more Information Enter 116 AD12074StGobain.indd 1 www.applianceDESIGN.com applianceDESIGN 11/16/07 9:17:17 41 February 2008 AM http://www.igniterproducts.saint-gobain.com http://www.igniterproducts.saint-gobain.com http://www.appliancedesign.com
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