초록 ▼

A DC Link for use with a multi-phase DC to AC converter provides soft-switch opportunities to the main inverter devices only when such opportunities are required. A quasi-resonant rail swings from source to ground potential either with or without the assistance of an auxiliary switch. The quasi-reso

A DC Link for use with a multi-phase DC to AC converter provides soft-switch opportunities to the main inverter devices only when such opportunities are required. A quasi-resonant rail swings from source to ground potential either with or without the assistance of an auxiliary switch. The quasi-resonant rail swings from ground to source potential with the assistance of an auxiliary switch. Low switch stresses are characteristic in both the main inverter switch devices and the DC link switch devices. Main power is carried predominantly through a DC link switch thereby minimizing power handling requirements of DC link reactive components.

대표청구항 ▼

A DC link having a DC input and a DC output, the DC input coupled to a DC source and the DC output having substantially a first voltage during power delivery intervals and substantially a second voltage during power interrupt intervals, the DC link comprising: the DC input comprising a positive DC r

A DC link having a DC input and a DC output, the DC input coupled to a DC source and the DC output having substantially a first voltage during power delivery intervals and substantially a second voltage during power interrupt intervals, the DC link comprising: the DC input comprising a positive DC rail at the first voltage and a negative DC rail at the second voltage; the DC output comprising a quasi-resonant rail and the negative DC rail; a first controlled switch connected between the positive DC rail and the quasi-resonant rail; a second controlled switch connected between the negative DC rail and the quasi-resonant rail; first and second diodes, the first diode coupled in anti-parallel across the first controlled switch and the second diode coupled in anti-parallel across the second controlled switch; first and second capacitors, the first capacitor coupled across the first controlled switch and the second capacitor coupled across the second controlled switch; a series coupled inductor and capacitor coupled having first and second ends, the first end thereof being coupled to the quasi-resonant rail; a third controlled switch coupled between the positive DC rail and the second end of the series coupled inductor and capacitor; a third diode coupled in anti-parallel across the third controlled switch; and a DC link control for executing power interrupt intervals intermediate power delivery intervals by sequentially commanding off the first controlled switch to release the quasi-resonant rail from the first voltage to thereby swing the quasi-resonant rail to the second voltage, commanding on the second controlled switch while the second diode is forward biased, commanding on the third controlled switch to catalyze a swing of the quasi-resonant rail to the first voltage, commanding off the second controlled switch to release the quasi-resonant rail from the second voltage to thereby swing the quasi-resonant rail to the first voltage, commanding on the first controlled switch while the first diode is forward biased, and commanding off the third controlled switch while the third diode is forward biased.