Low-loss power current inverter
First Claim
Patent Images
1. A low-loss power inverter, comprising:
- a d.c. intermediate circuit having a first tie point and including an upper pair of series-connected capacitors having a second tie point, and a lower pair of series-connected capacitors having a third tie point, the upper pair of series-connected capacitors being connected in series to the lower pair of series connected capacitors, each of the upper pair of series-connected capacitors having substantially equal capacitances and each of the lower pair of series-connected capacitors having substantially equal capacitances;
at least one isolating diode;
an inverter phase connected in parallel to the d.c. intermediate circuit and having an output terminal, the inverter phase including an upper bridge half and a lower bridge half, each of the upper bridge half and the lower bridge half including two power semiconductor switches and two diodes, each of the two diodes of each of the upper bridge half and the lower bridge half being antiparallel-connected to one of the two power semiconductor switches, the two semiconductor switches of each of the upper bridge half and the lower bridge half having a fourth tie point, the fourth tie point being coupled to the first tie point via one of the at least one isolating diode;
an auxiliary circuit including an upper auxiliary switch, a lower auxiliary switch, and a resonant inductor, each of the upper auxiliary switch and the lower auxiliary switch being connected in series to the resonant inductor, the auxiliary circuit coupling the second tie point and the third tie point to the output terminal; and
at least one resonant capacitor coupled to the inverter phase.
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Abstract
A low-loss power inverter is provided. Each inverter phase includes an upper and a lower bridge half, each having two power semiconductor switches, with antiparallel-connected diodes, with one tie point of the power semiconductor switches being connected using an isolating diode to a tie point of a d.c. intermediate circuit, an auxiliary circuit consisting of an upper and a lower auxiliary switch and a resonant inductor is provided, and at least one resonant capacitor is provided for power semiconductor switches of the inverter phase. This yields a low-loss power inverter which combines the advantages of a three-point inverter with those of an ARCP inverter.
34 Citations
17 Claims
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1. A low-loss power inverter, comprising:
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a d.c. intermediate circuit having a first tie point and including an upper pair of series-connected capacitors having a second tie point, and a lower pair of series-connected capacitors having a third tie point, the upper pair of series-connected capacitors being connected in series to the lower pair of series connected capacitors, each of the upper pair of series-connected capacitors having substantially equal capacitances and each of the lower pair of series-connected capacitors having substantially equal capacitances; at least one isolating diode; an inverter phase connected in parallel to the d.c. intermediate circuit and having an output terminal, the inverter phase including an upper bridge half and a lower bridge half, each of the upper bridge half and the lower bridge half including two power semiconductor switches and two diodes, each of the two diodes of each of the upper bridge half and the lower bridge half being antiparallel-connected to one of the two power semiconductor switches, the two semiconductor switches of each of the upper bridge half and the lower bridge half having a fourth tie point, the fourth tie point being coupled to the first tie point via one of the at least one isolating diode; an auxiliary circuit including an upper auxiliary switch, a lower auxiliary switch, and a resonant inductor, each of the upper auxiliary switch and the lower auxiliary switch being connected in series to the resonant inductor, the auxiliary circuit coupling the second tie point and the third tie point to the output terminal; and at least one resonant capacitor coupled to the inverter phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A low-loss power inverter, comprising:
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a d.c. intermediate circuit having a first tie point and including an upper pair of series-connected capacitors having a second tie point, and a lower pair of series-connected capacitors having a third tie point, the upper pair of series-connected capacitors being connected in series to the lower pair of series connected capacitors, the upper pair of series-connected capacitors having substantially equal capacitances and the lower pair of series-connected capacitors having substantially equal capacitances; at least one isolating diode; an inverter phase connected in parallel to the d.c. intermediate circuit and having an output terminal, the inverter phase including an upper bridge half and a lower bridge half, each of the upper bridge half and the lower bridge half including two power semiconductor switches and two diodes, each of the two diodes of each of the upper bridge half and the lower bridge half being antiparallel-connected to one of the two power semiconductor switches, the two semiconductor switches of each of the upper bridge half and the lower bridge half having a fourth tie point, the fourth tie point being coupled to the first tie point via one of the at least one isolating diodes; and an auxiliary circuit including an upper auxiliary switch, a lower auxiliary switch, and two resonant inductors, each of the upper auxiliary switch and the lower auxiliary switch being connected in series to one of the two resonant inductors, the auxiliary circuit coupling the second tie point and the third tie point to the output terminal; and at least one resonant capacitor coupled to the inverter phase.
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Specification