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Short-Circuit Critical Frequency for Induction Heating Parallel Resonant Inverters
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| Author(s) |
Jose JORDÃN, Jose Miguel MAGRANER, Cesar CASES, Vicente ESTEVE, Enrique DEDE, Esteban SANCHIS-KILDERS, Enrique MASET, Eva GUMBAU |
| Abstract |
In induction heating applications, the component being heated is very close to the heating coil. Due to the high temperatures reached during the process, isolation is not always possible and short-circuits may happen. Two main types of short-circuit should be considered: complete inductor's short-circuit and short-circuit between windings. Parallel resonant oscillators are widely used in induction heating applications together with a current fed inverter to generate the alternating current. Parasitic inductance in the connection between the inverter and the oscillator tank may generate high over-voltages if the switching is uncontrolled. The aim of the paper is to describe the protections needed to avoid the failure of the transistors due to over-voltages which may occur during the short-circuit process. Short-circuit critical frequency is calculated and determines whether over-voltages will appear after short-circuit occurs. |
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| Filename: | 0589-epe2009-full-11440518.pdf |
| Filesize: | 240.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2010-01-27 by System |
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