초록 ▼

A high efficiency power converter is achieved which eliminates the needs for self-commutated devices and requires only twelve thyristors for full double bridge AC/AC power conversion. The system utilizes a series resonant DC link between the AC/DC and DC/AC converters. The DC resonant circuit functi

A high efficiency power converter is achieved which eliminates the needs for self-commutated devices and requires only twelve thyristors for full double bridge AC/AC power conversion. The system utilizes a series resonant DC link between the AC/DC and DC/AC converters. The DC resonant circuit functions as a commutating circuit which ensures turn off of all twelve thyristors by providing the necessary zero current instants. A significantly improved sinusoidal current waveform can be obtained on both the input and the output compared to conventional high power converters by the use of high frequency pulse density modulation.

대표청구항 ▼

A power converter for converting DC power to AC power comprising: (a) a DC series resonant link circuit having a capacitor adapted to receive a DC power input, a first inductor connected in series with the capacitor, a second inductor connected in parallel with at least the capacitor, and a DC curre

A power converter for converting DC power to AC power comprising: (a) a DC series resonant link circuit having a capacitor adapted to receive a DC power input, a first inductor connected in series with the capacitor, a second inductor connected in parallel with at least the capacitor, and a DC current bus providing the output current from the resonant circuit; (b) means for causing the resonant circuit to oscillate stably at or near its resonant frequency and for the current on the DC current bus to be maintained at a desired average DC level and to go to zero current at least once during each cycle of oscillation of the resonant circuit; and (c) an inverter connected to receive the current on the DC bus and having gated switching devices which are switched on and off only when the current on the DC bus feeding the inverter is substantially zero.