| Abstract |
Recent analytical studies on the functioning of static power converters and resulting new structures permit the realisation of reliable, lightweight and economic power supplies for domains as diverse as UPS, aerospace power supply, speed variable drive, instrumentation, etc. In this article, the authors present the realisation of a three phase inverter which combines the advantages of high frequency switching conversion with that of advance reversible power control. Thus, it is possible to assure the functioning of the inverter on no-load or full-Ioad conditions with good regulation and easy protection. Moreover, third harmonic techniques make it possible to obtain an o/p voltage 15 % higher than that of conventional systems. For applications related to speed variable drives for AC motors, the absence of HF and LF harmonics is equally advantageous. On this breadboard realisation, the condition U/f = const. is easily met even at low frequencies and the motor is braked regeneratively. |
