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Investigation and Implementation of a 10 MHz DC/DC Converter For AESA Radar Applications

Niklas Hagman ; Erik Gustavsson
Göteborg : Chalmers tekniska högskola, 2014. 70 s.
[Examensarbete på avancerad nivå]

The field of power electronics is under constant pursuit for devices with higher power density, improved efficiency, spectral purity, and low cost. In this thesis two DC/DC converter topologies converting 50 V to 30 V, with a maximum load of 6 W are implemented in hardware. The two converter topologies implemented are a Buck converter and a ZVS-CV converter. The converters suitability to operate with a switching frequency of 10 MHz is evaluated. The Buck converter showed an overall peak efficiency of 80.8 %, with a switching frequency of 9.8 MHz. The Buck output power stage alone showed a peak efficiency of 87.2 %. The ZVS-CV converter showed an overall peak efficiency of 76.1 % with a switching frequency of 9.0 MHz, and a peak output stage efficiency of 95.2 %. The higher efficiency for the output power stage of the ZVS-CV is a result of successful removal of switching losses in the switching transistor. The lower overall efficiency of the ZVS-CV converter is due to the need of a more complex control and driving circuit. However, it might be possible to improve the efficiency of the driver circuit in the ZVS-CV converter. The output voltage ripple in the Buck converter is approximately 500 mV compared to the 100 mV in the ZVS-CV converter. The ZVS-CV converter is deemed well suited for 10 MHz operation. Future work should include implementation of a voltage regulator, development of a more efficient driver and control circuit, adaptive control of the dead time and an improved output filter to increase voltage quality.



Publikationen registrerades 2014-07-03. Den ändrades senast 2014-07-03

CPL ID: 200124

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