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Extra resources for Control in Power Electronics: Selected Problems (Academic Press Series in Engineering)
Controlled switch and a freewheeling diode, is shown in Fig. 38. Both the output voltage, vo , and current, io , can only be positive. The average output voltage is given by Vo ¼ DVi ð1:15Þ where D denotes the duty ratio of the switch. The magnitude control ratio, M, is defined here as Vo =Vi and it equals D. Example waveforms of vo and io are shown in Fig. 75. As in all PWM converters, the output voltage is pulsed, but the output current is continuous thanks to the load inductance. The current ripple is inverse proportional to the switching frequency, fsw .
The resonance is initiated by turning on the bidirectional switch, composed of auxiliary switches SA1 and SA2 and their antiparallel diodes. The auxiliary switches are turned on and off under zero-current conditions. ARCP inverters, typically designed for high-power applications, provide highly efficient power conversion. In contrast to the RDCL inverter, whose output voltage waveforms consist of packets of resonant pulses, the ARCP inverter is capable of true pulse width modulation, but with the voltage pulses characterized by low dv=dt.
These capacitors shunt a part of the harmonic content of squarewave currents, so that the load currents resemble those of the VSI. 6 CONCLUSION The described variety of power electronic converters allows efficient conversion and control of electrical power. Pulse width modulated converters offer better operating characteristics than the phase-controlled ones, but the very process of high-frequency switching creates undesirable side effects of its own. 63 Output current waveforms in a current-source inverter in the square-wave mode.