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Partial shading on photovoltaic (PV) strings is known to generate serious issues, such as reduced power generation and occurrence of multiple power point maxima. Although various kinds of PV equalizers have been proposed for preventing the partial shading issues, most conventional PV equalizers require numerous switches, likely increasing the circuit complexity. In this paper, the single-switch PV...
A passive lossless snubber for soft-switching Bidirectional Buck/boost Converter (BBC) is proposed in this paper. Although the conventional lossless snubbers can effectively alleviate the switching losses during turn on and turn off transients, they can be applied to only the unidirectional converters, but not a bidirectional converter. On the other hand, the proposed lossless snubber is able to improve...
The proposed xenon lamp drivers are composed of the capacitor charging and main pulse unit, simmer power supply unit, and series trigger unit. The capacitor bank stores the energy to generate pulses of light sintering and the series trigger ionizes the xenon in the lamp. The simmer not only sustains this ionized xenon gas but also improves the better lamp lifetime and efficiency by reducing the number...
High gain DC-DC converters have become increasingly popular in recent years as there is greater need to interface low voltage DC sources such as solar cells and batteries with much higher voltage DC buses. A new high gain DC-DC converter with high gain, galvanic isolation and an integrated passive snubber network is proposed in the paper. In the paper, the general operation of the converter is discussed,...
Due to the increasing demands of safe and efficient renewable energy systems, isolated DC-DC converters became widely used in this field as the essential power conversion blocks. At the same time, such converters are demanded for wide input voltage range and fault tolerance as desirable features. This paper proposes a isolated boost full bridge DC-DC converter which features wide input range and resilient...
Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
Flyback type converters are widely used in various applications including small power LED drivers. However, they suffer from the losses from the snubber circuit. To beat this problem, previous studies investigated the lossless snubbers. However, they still have a limitation due to the additional components resulting in a high cost and low power density. In this paper, a new converter topology for...
This paper presents a simple passive voltage balancing circuit for a modular DC/DC step-up converter for medium voltage (MV) DC grid in wind energy systems. The proposed auxiliary circuit is able to balance the capacitor voltages over a wide range of operating points. Regarding the converter, high frequency step-up resonant circuits with high gain rectifier modules are combined to form a modular step-up...
This paper presents the operation principle and benefits of a novel power converter topology named three-level two-stage decoupled Active Neutral Point Clamped Converter (3L-TDANPC), which is implemented based on a hybrid utilization of Si IGBTs and SiC MOSFETs. The 3L-TDANPC converter can achieve high efficiency with limited number of SiC MOSFET modules while keeping balanced distribution among the...
Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
In this paper, a soft switching technique for a LED driver based on an Integrated Double Buck-Boost (IDBB) converter is presented. The converter is a two-stage cascaded Buck-Boost topology featuring a single main switch and positive voltage output. The first stage is connected to the grid and it is operated in discontinuous conduction mode (DCM); working this way, a high power factor is naturally...
Series connected IGBTs provide a useful method to improve the voltage level, and which is a very important approach to achieve high-voltage power converters. However the imbalance of collector-emitter voltages across IGBTs is a key issue that must be addressed. This paper proposed a novel type of series connected IGBT circuit with voltage self-balance by using clamping diode and snubber capacitor,...
This paper proposed a novel isolated bidirectional flyback converter integrated with two non-dissipative LC snubbers. In the proposed topology, the main flyback transformer and the LC snubbers are crossed-coupled to reduce current circulation and recycle the leakage energy. The proposed isolated bidirectional flyback converter can step-up the voltage of the battery (Vbat = 12V) to a high voltage side...
A new three-phase DC-DC PWM boost converter that is suitable for use in renewable energy applications is proposed in the paper. The number of components in the proposed circuit is fewer that other previously proposed converters of the same type, resulting in lower cost and simpler operation. The paper discusses the operation of the converter, presents a procedure for its design, and demonstrates the...
Flyback converters are widely used in telecom applications with two of the most popular being in point-of-use power supplies and as part of two-stage AC-DC converters. They can be implemented with either passive snubbers or active snubbers for the main converter switch. Active snubbers are generally thought to be more efficient but more expensive than passive snubbers, but recent developments in passive...
This paper proposes a modified DC-DC flyback converter with high efficiency. The converter is based on an N-stages flyback converter with the inputs in parallel and output in series. A high efficiency is obtained by including an active snubber circuit, which returns the energy stored in the transformer leakage inductance to the input source. This topology reduces the current in each switch therefore...
In this work, four different snubber solutions for an Auxiliary Resonant Commutated Pole (ARCP) converter with an auxiliary thyristor are evaluated. The first two solutions are an RC snubber and a variation thereoff where the RC snubber losses are reduced by employing diodes for limiting the voltage overshoot. Two other concepts are a novel lossless dV/dt clamp snubber circuit and a low-loss RC snubber...
This paper proposes a transformerless improved step-down conversion ratio Interleaved Buck Converter (IBC) with low switch voltage stress, which is achieved through capacitive voltage division. A snubber circuit is also incorporated which can perform as an auxiliary circuit for capacitor pre-charging as well as can perform snubber function. The proposed approach eliminates the need of additional pre-charging...
This paper presents a zero voltage switching (ZVS) passive snubber circuit for the MOSFET used in conventional boost converter which consists of an inductor, a capacitor, a resistance and a diode. It helps in improving the high current and voltage stress. With the help of this circuit, power conversion efficiency is improved by controlling the voltage and current in the switch, thus providing zero-voltage...
In this paper, a novel valley-fill snubber circuit for a three-phase PWM inverter is proposed. One advantage of the valley-fill snubber is that surge voltage suppression is achieved without the power loss that happens in a conventional snubber resister. The second advantage is that ZVS/ZCS operation is realized without using additional active switches. Hence, the proposed snubber circuit is effective...
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