Abstract
A dc-dc converter with asymmetric pulse-width modulation is presented for medium voltage applications, such as three-phase ac-dc converters, dc microgrid systems, or dc traction systems. To overcome high voltage stress on primary side and high current rating on secondary side, three dc-dc circuits with primary-series secondary-parallel structure are employed in the proposed converter. Current doubler rectifiers are used on the secondary side to achieve low ripple current on output side. Asymmetric pulse-width modulation is adopted to realize soft switching operation for power switches for wide load current operation and achieve high circuit efficiency. Current balancing cells with magnetic component are used on the primary side to achieve current balance in each circuit cell. The voltage balance capacitors are also adopted on primary side to realize voltage balance of input split capacitors. Finally, the circuit performance is confirmed and verified from the experiments with a 1.44 kW prototype.
Highlights
Medium voltage dc–dc converters have been proposed and implemented to achieve high power density and high efficiency advantages for dc light rail transportation systems [1,2], dc microgrid systems [3,4], or industry power converters [5,6]
This paper presents a high voltage dc–dc converter with three cascade half-bridge circuits on primary side to reduce the voltage and current ratings of power devices for high voltage and medium power applications, such as dc light trail transportation systems and three-phase ac–dc power converters
S6 are controlled in the same circuit manner as S2, it can be expected that the zero-voltage switching of power switches S3 ~S6 are all achieved from 20% output load
Summary
Medium voltage dc–dc converters have been proposed and implemented to achieve high power density and high efficiency advantages for dc light rail transportation systems [1,2], dc microgrid systems [3,4], or industry power converters [5,6]. In those applications, the high side dc bus voltage is normally at 750 V. This paper presents a high voltage dc–dc converter with three cascade half-bridge circuits on primary side to reduce the voltage and current ratings of power devices for high voltage and medium power applications, such as dc light trail transportation systems and three-phase ac–dc power converters.
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