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MODELLING POWER MOSFET DC-DC CONVERTERS USING SPICE2 PROGRAM
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| Author(s) |
E. Tatakis; J. Sanchez-Molero |
| Abstract |
This paper deals with computer-aided analysis and simulation of a power mosfet dc-dc converter. Improved models for power mosfets and power diodes, adapted to SPICE2 are described in order to simulate accurately their static and dynamic behavior. The parameters of the models are determined using non-linear optimization methods. The variation of power mosfets on-resistance with drain current is considered and the variable gate-drain capacitance is simulated by an auxiliary network. Hence its possible to estimate with an excellent accuracy turn-on and turn-off wave forms, as well as switching and conduction losses. Models for power diodes are based upon the physical structure of a PIN diode. An auxiliary network is used to simulate the rate of decrease of the recovery current which plays an important role in power circuits containing inductances . We also demonstrate that noise voltages at the output terminals of the switching power supply can be predicted if we include the dominant parasitic elements in the models of passive components. To obtain accurate values of these spikes we have to take the layout into account by introducing the inductances of the connections. Simulated wave forms on a forward dc-dc converter and experimental results are in excellent agreement. |
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| Filename: | Unnamed file |
| Filesize: | 3.603 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-15 by System |
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