Control of inverter for inductively powered electric vehicles

Abstract

Artykuł przedstawia analizę pracy oraz wybrane wyniki badania modelu laboratoryjnego układu bezstykowego przekazywania energii elektrycznej do pojazdów elektrycznych z wykorzystaniem cewek o słabym sprzężeniu magnetycznym. W szczególności omówiono warunki pracy układu w stanie rezonansu, dobór parametrów układu i metodę sterowania przekształtnika tranzystorowego w przypadku zmiany wielkości szczeliny powietrznej pomiędzy cewkami.Most electrical equipment in common use is connected to the supply via plugs, flexible cables, slip rings, pantograph, etc. It can be useless in moist or explosion-endangered environment. This paper describes a technique, the contactless electrical energy transfer system, by which electrical energy may be transmitted through the large air gap. The transfer system is attractive especially for automatic battery charging stations and for energy supply of inductively powered electric vehicles and other movable consumers. In this case energy is transmitted via ironless transformer. Coupling between the windings is variables and depend on dimensions of air gap. The efficiency of system with large air gap (about 100 mm) can be considerably improved by using higher transmission frequencies in the range approximately 100 kHz. Large leakage inductances may be compensated also in resonance condition by adding capacitances to the windings. Paper presented analysis of power electronics converter with variable voltage frequency. These theoretical developments are compared with practical measurements from a prototype contactless system