INVERTER SYSTEM HAVING SMOOTH SWITCHING BETWEEN OPERATIONAL MODES

摘要

In an inverter system for the conversion of direct current power to alternating current power of the type including an inverter circuit selectively operable in either a time ratio controlled (pulse width modulation) or a square wave mode there is provided suitable control means and method of operation to insure a substantially constant voltage-frequency relationship throughout the operating range of the inverter circuit, including the transition period between the two modes of operation.