Patent ID: 6111770
Filing Date: 2000-08-29
Classification: H02M

Abstract:
An auxiliary resonant dc tank converter, comprising:an ac power supply and an ac bus;a dc power supply for providing dc current to a dc bus;an inverter having at least one phase leg connected to said ac bus and connected across said dc bus, said inverter having at least one main switching device per phase leg; anda resonant dc tank circuit coupled in parallel with said dc power supply for generating a resonant voltage across said dc bus, said resonant dc tank circuit including;an upper resonant capacitor and a lower resonant capacitor connected in series as a resonant leg,a first dc tank capacitor and a second dc tank capacitor connected in series as a tank leg, andan auxiliary resonant circuit, said auxiliary resonant circuit being coupled across the junction of said upper and lower resonant capacitors and the junction of said first and second dc tank capacitors, said lower resonant capacitor being coupled across said dc bus, said resonant leg being coupled across said tank leg.