| Abstract |
Photovoltaic systems need an actuating element for the adaption of the generator to the back-up battery or the d.c. link. Further especially for these systems a high efficiency is desired. The d.c./d.c. converter with the two-switch structure improves a high efficiency and it has an integrated power supply for the controlling unit, the data acquisition and the basic current for the main transistor. By switching off the main transistor of the converter the current commutates to the auxiliary transistor and the integrated power supply will be loaded. lf its voltage is high enough, the auxiliary transistor switches off the current. The converter works on the effect, that the auxiliary transistor (MOSFET) operates much faster than the main transistor (bipolar). For the dimensioning of the reactor a new method, the so-called core distinctive number method is used. The measurements show, that the efficiency especially in the range less than 1/3 of the maximum power is better than for usual converters. |
