Solution for paralleling of discrete MOSFETs in hard switching power electronic converters

Request Number N177574
Need details

Siemens is seeking solutions for paralleling of discrete MOSFETs in hard switching power electronic converters



Semiconductor discrete devices such as MOSFETs are widely used in power electronic applications. However the current rating of a single device is rather limited (ID = 30…100A). In order to use the same technology for higher power applications several devices need to be paralleled.


Exclusively MOSFET devices in Silicon and Silicon Carbide with a blocking voltage (Vdsmax) of >=600 V shall be considered. The application area lies in hard switching DC/AC converters with two, three and multi-level topologies.


Key Success Criteria

The paralleled devices shall exactly behave like a single device in regard to switching performance and efficiency.


The current shall be evenly shared between MOSFETs in parallel operation even if tolerances in the threshold voltage of each device exist. The current sharing shall be better than 5 % (dynamically and stationary) over the whole operating temperature range of the device.


The proposed solution shall be capable of operating at least three and up to six MOSFET devices in parallel. Robustness towards typical device tolerances is essential. A preselection phase must be avoided.


The switching frequency of a single device shall be above 20 kHz.


Possible Approaches

Active dynamic gate drive control.

Approaches not of interest

Passive decoupling by including bulky sharing reactors; decoupling by parallel interleaving; reduction of switching performance.


Preferred Collaboration types
  • Joint Development
  • Contract Research
  • Technology Licensing
  • Technology Acquisition
  • Consulting
  • Supply Agreement
  • To Be Negotiated
Items to be submitted

We are looking for concise, non-confidential proposals. The proposal should:

•           Describe the technical approach

•           Include a description of the responding organisation or team and their experience


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Point of Contact
Stephen Clulow
Area of Interest
  • Electronics & Electronic Components
  • Energy & Power Production
  • Power Transmission
Due Date
June 30, 2017
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