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ARE PARALLELED IGBT MODULES OR PARALLELED IGBT INVERTERS THE BETTER CHOICE?
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| Author(s) |
Ch. Keller; Y. Tadros |
| Abstract |
The power range which can be handled by PWM inverter applying available IGBT modules is about 150kW. For higher power levels more than one device per bridge arm is necessary. In this paper possibilities to enlarge output power of IGBT inverters using parallel circuit are discussed . For direct parallel operation of advanced IGBT devices difficulties are caused by negative temperature coefficient of on-state voltage. This includes a risk of thermal runaway or large imbalance of current sharing. The necessary conditions for a good current balance will be deduced. Satisfying these conditions, direct paralleling of high current IGBT modules is possible up to three devices. For higher power levels with a larger number of IGBT modules it is not possible to achieve close thermal coupling which is essential for good on-state current sharing. For such higher power-levels paralleled inverters with electronic controlled current imbalance are advisable. |
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| Filesize: | 3.57 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-03 by System |
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