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This paper introduces a novel circuit configuration of multilevel current-source inverter (CSI) that has many steps with fewer power switches. In this new topology, an H-bridge CSI is connected with current-cell circuits working to generate the intermediate level currents of multilevel current waveform. Using the proposed topology, the switching power device count, isolated gate drive circuits and...
One of challenges in power conversion with conventional topologies is a large smoothing capacitor. This paper proposes a soft-switching boost DC to AC converter, which is a combination of a DC/AC converter and a pulse voltage generator working as a step-up chopper. The pulse generator generates high frequency pulse voltage from a low DC voltage with relatively small inductor and capacitor. The DC/AC...
This paper deals with a resonant gate-drive circuit for fast and high-voltage power semiconductor devices, which is equipped with optical fibers for both gate control signal and dc power supply. A resonant inductor connected with the gate terminal makes it possible to charge or discharge the gate-to-source voltage by using the parallel resonance between the inductor and the input capacitance of the...
A novel two-phase interleaved LLC resonant converter is proposed, which can manage the number of phases by output loading. In the proposed scheme, the output load current is detected with sensing resistor in the output terminal. The measured value is compared with the threshold value for phase management and the signal is generated to trigger the gate driver. As a result, it is possible to improve...
Recently, DC power supply systems have been widely viewed as an energy-saving solution. The protection of the system from over current is one of the most important factors in DC power supply system. This paper presents malfunction mechanism of a semiconductor circuit breaker.
A four-phase interleaved bidirectional dc-dc converter with coupled inductor is adopted in both boost- and buck-mode operations. The circuit allows synchronous mode operation to achieve zero-voltage switching. Together with the use of low Rds-on power MOSFET as the switching device, ultra high efficiency can be obtained. This paper shows a high-voltage example system operating completely in synchronous...
This paper presents a double DC-DC converter for uninterruptible power supply applications. The converter has a simple structure and is applied to a high capacity uninterruptible power supply (UPS). In comparison with a conventional DC-DC converter, a double DC-DC converter exhibits lower ripple current and offers many benefits to UPS systems such as size/weight reduction and higher efficiency. The...
In this paper, a novel step-up converter is presented, where the charge pump concept, combined with the traditional boost converter structure, is utilized. Although two inductors are used in such a converter, the difference in value between the two inductors does not degrade the performance of this converter. Besides, the behavior of this converter is similar to the traditional boost converter, and...
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