Zeta topology DC/DC converter design based on TPS40200 driver

Objectives. The study set out to investigate typical characteristics of a Zeta converter developed by the authors based on the TPS40200 driver under various input voltages and loads and compare the experimental characteristics of the Zeta converter with those obtained through SPICE¹ simulation in the Multisim computer-aided design (CAD) system, as well as with the results derived from a continuous-time mathematical model.

Methods. A continuous-time mathematical model of the Zeta converter and the Multisim CAD system were used. The schematic diagram of the converter was developed according to the TPS40200 driver circuit design methodology presented in its datasheet. The printed circuit board layout was created using the Altium Designer CAD system.

Results. An experimental test bench of the Zeta topology DC/DC converter was designed and built using coupled chokes based onthe TPS40200driver. The results ofthe study showed ahigh correlation ofboth its load characteristics and its DC and AC components of currents flowing through the choke windings and capacitor voltages from the input voltage at two load resistances of 50 and 100 Ohm obtained by experimental, computational, and modeling methods.

Conclusions. The continuous-time mathematical model of the converter, along with the calculation method based on it, forms a foundation for the design of DC/DC converters using the Zeta topology. The experiment confirms the validity of both the mathematical model and the calculation method. The proposed design methods takes the magnetic coupling and the active resistance of inductors into account. The magnetic coupling permits a two-fold reduction of inductor values while maintaining the same ripple or a reduction in the ripple by up to half with unchanged inductor values.

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