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This paper introduces a dual-mode hybrid zero-voltage/zero-current switching (ZVS/ZCS) circuit and a complementary controller for flyback converters operating in discontinuous conduction mode (DCM). The new ZVS/ZCS solution provides soft switching feature and high efficiency throughout the whole operating range. It also requires smaller components than other soft switching solutions [1]–[6]. To achieve...
This paper presents a GaN Transistor based 90W ac/dc adapter with a Buck-PFC stage and an isolated Quasi-Switched-Capacitor (QSC) dc/dc stage. In the dc/dc stage, two different QSC converters are proposed. Compared to Flyback and LLC resonant converters, the QSC converters feature: 1) reduced voltage stress on the primary-side switches to 2/3 of the input voltage; 2) reduced voltage stress on the...
This paper introduces a novel bridgeless resonant ac-to-dc converter, capable of efficiently converting arbitrary low-amplitude input voltages into a regulated dc voltage. High-frequency resonant operation owing to LC resonance allows small footprint for passive components, thereby increasing the circuit power density without suffering from switching losses. A resonant gate drive circuit is designed...
This paper presents a general method to measure the output capacitance (Coss) related energy loss per switching cycle in power MOSFETs used in zero-voltage-switched (ZVS) applications. It is shown that a simple model using Coss in series with a resistance Ross is inadequate for describing the observed energy loss and a different model is needed. This work also shows that the traditional hard-switched...
This paper discusses a development for high output of 2.5 MHz inverter without fast-switching semiconductor switches. This inverter consists of a multi-phase inverter using conventional silicon semiconductor switches and multiple core transformers. In this paper, a principle of drop in inverter output voltage which reduces the inverter output voltage due to a relationship between dead-time and a leakage...
Against conventional wisdom, asymmetrical interleaving strategy is proposed for two-phase interleaved LLC resonant DC/DC running at the same switching frequency to guarantee the equilibrium point of current sharing under all operation condition. Basing this strategy, adaptive-voltage-positioning (AVP) concept is further proposed for passive current sharing realization, while satisfying output voltage...
This paper presents a new self-oscillating resonant gate drive composed solely of passive components. The gate drive can be used in various resonant converters and inverters and can be used for both low and high side gate drive. The paper presents examples of how higher order harmonics can be used to improve the performance of the gate drive and how the gate drive can be implemented in a class E inverter,...
The paper proposes a novel push-pull forward converter (PPFC) in which a passive resonant network is introduced in the secondary winding. The converter can effectively overcome the drawbacks of the conventional PPFC, such as the high voltage stress over rectifying diodes and high voltage overshoots of switches. Furthermore, efficiency of the converter can be improved. Operating principles and features...
In this paper, the small-signal model of LLC resonant converter is derived using extended describing function (EDF) methodology and the dynamics of the LLC resonant converter are studied based on the small signal model taking into account the circuit parasitic resistance. When designing the controller, this damping effect induced by the parasitic resistance is usually neglected. While it will be shown...
This paper introduces a unified modeling methodology to describe and explore the loss mechanism of resonant Switched Capacitor Converter (SCC) operating in a self-commutation zero current switching. The conventional equivalent resistance concept, which assumes a single conduction path of the resonant current, is generalized to model the losses in cases where the resonant current is divided across...
This paper will present an improved Coupled-Magnetic method for Reset Zero-voltage switching inverter. The improved inverter topology can fully use leakage inductance of coupled inductor, simplify the coupled inductor design, and improve the inductor coupled efficiency and inverter efficiency. Besides, this improved soft-switching inverter also inherit same merits, which are: The main device is Power...
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