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In this paper, a novel LLC resonant converter with parallel input and parallel output circuit topology is proposed to achieve the good performance of reduced switch count and medium power compared with conventional parallel half-bridge resonant converter. The proposed LLC resonant converter has two resonant circuits, two resonant circuits use the same power switches to transmit power so that the switch...
In this paper, we propose an efficient terrain meshing method based on discrete point cloud, which is based on the existing meshing method of 3D reconstruction. Our meshing method uses the DTM (Delaunay Triangle Mesh) as a criterion to establish vertex constraints and evaluation functions. We start from a seed triangle and use the growing method to extend the outer-edge of each triangle until all...
Scene space organizational structure and visibility culling plays a crucial role in the quality and efficiency of subsequent rendering. To improve the real-time rendering of indoor and outdoor objects and enhance the organization efficiency of scenes, we propose an optimized scene management structure for fast visibility culling. We organize the scene into an adaptive binary tree (ABT) structure to...
Scene management technology is one of the key technologies of virtual reality and visualization. In this paper, we propose a new method based on adaptive binary tree (ABT) and scene graph, which is used to improve the real-time rendering of indoor and outdoor objects and enhance the organization efficiency of scenes structure. The generation algorithm of adaptive binary tree, the scoring standard...
The investigation and study of deep sea ore is an important part of deep sea scientific research. In accordance with the requirements of the “Jiaolong” manned submersible deep ore sampling job, launched a design of portable deep cutting device which based on the “Jiaolong”. By analyzing the working characteristics and structural features of world underwater cutting work tool, design a mounted Jiaolong's...
The Five-Level Active-Neutral-Point-Clamped (5L-ANPC) inverters are receiving more attentions as one of preferred solutions for medium and high power applications because of the combination of the features of the conventional Flying-Capacitor (FC) type and Neutral-Point-Clamped (NPC) type inverters. This paper proposes a new DC-link capacitor voltages balancing technique for the Seven-Switch 5L-ANPC...
This paper proposes a 1-MHz single stage LLC converter with improved hybrid full bridge / voltage doubler rectifier for laptop power adapter. Using single stage LLC instead of the two stage configuration is expected to reduce both the size and loss of the existing commercial products. For universal AC input, the hybrid full bridge / voltage doubler rectifier is desired. At 220 V AC input condition,...
The Five-Level Active-Neutral-Point-Clamped (5L-ANPC) inverter is one of the most popular topologies among five-level inverters since it combines the features of Flying-Capacitor (FC) type and Neutral-Point-Clamped (NPC) type inverters and was commercially used for industrial applications. This paper proposes a novel modulation strategy for a Six-Switch 5L-ANPC (6S-5L-ANPC) topology to keep voltages...
LCLC converter is an LLC-based, four-element resonant topology, which has been proved to achieve high voltage gain and high efficiency. Such trait makes LCLC converter specifically suitable for wide-input-voltage-range DC/DC applications. Currently, LCLC converter lacks a design method targeting at optimal efficiency over a wide input voltage range. In fact, due to the complexity, efficiency itself...
Dynamic voltage Scaling (DVS) has been widely studied as an innovative technology in reducing the real-time embedded devices. An efficient performance of DVS algorithm largely depends on how to acquire more slack times to scale voltage down. In this paper, we present a more effective power management algorithm to reclaim online slack time from both higher-priority and lower-priority tasks. Based on...
An automatic current sharing method is proposed for multi-phase LLC resonant converter for high power application. There are two types, one is common inductor, and the other is common capacitor. Automatic current sharing is achieved by using a common component for all LLC resonant stages. The proposed method can automatically share the load current without any additional circuit and control strategy...
In this paper, a new common capacitor current sharing method is proposed for multi-phase LLC resonant converter. Automatic current sharing is achieved by using a common resonant capacitor for all the LLC resonant stages, by connecting the resonant capacitors in each phase in parallel. The proposed method can automatically share the load current without any additional circuits and control strategy...
This paper proposes a new half bridge (HB) LLC resonant converter with pulse width modulated (PWM) auxiliary switch (sLLC converter) for hold-up mode operation. The proposed sLLC converter works with synchronous rectifier (SR), which is suitable for low output voltage applications. The magnetizing inductor can be designed with large value to reduce the circulation loss. In the proposed sLLC converter,...
An algorithm based on new circulated current model is proposed to analyze the circulating current in the multiphase LLC converter. First of all, a virtual-open concept is introduced and LLC phases are decoupled from each other, Thus, A circulating current model can be achieved from fundamental harmonic approximation (FHA). Secondly, the ac voltages on the equivalent resistor of different phases are...
The five-level active-neutral-point-clamped (ANPC) converters are newly hybrid topologies which have the advantages of traditional neutral-point-clamped (NPC) and flying-capacitor (FC) multilevel converters. A novel seven-switch five-level ANPC (7S-5L-ANPC) inverter topology is proposed, which reduces the number of active semiconductor switches over traditional 5L-ANPC inverter topologies. It is capable...
Multilevel converters are a popular solution for medium-voltage and high-power applications, including renewable energy conversion. Five-level active neutral-point-clamped converter (5L-ANPC) is one of the most advantageous topologies among five-level multilevel converters. A six-switch 5L-ANPC (6S-5L-ANPC) topology is proposed, which can achieve low-cost because several fast recovery diodes are employed...
A passive impedance matching (PIM) concept is proposed for multi-phase resonant converters application. The new concept can achieve load current sharing between every unit automatically. A passive element such as an inductor or a capacitor is connected in the common branch of the two units (or multi-units), such that several sets of equivalent positive resistors and negative resistors are distributed...
Submarine video surveillance technology is one of the most important technologies in the field of submarine investigation and exploration. This technology has been developed for many years but the previous submarine video surveillance systems typically use analog camera and video server architecture. This not only reduces the resolution of the video but also affects the real-time performance of the...
This paper proposes a new current-ripple-based control strategy for the Series Ripple Cancellation Converter (Series RCC), which eliminates LED light flicker caused by Power Factor Correction (PFC) stage and significantly reduces its output capacitance. Instead of sensing two differential output voltage signals as in existing voltage-ripple-based control strategy, the proposed current-ripple-based...
In this paper, a new common inductor current sharing method is proposed for multi-phase LLC resonant converter for high power application. Automatic current sharing is achieved by using a common resonant inductor for all the LLC resonant stages, by connecting the resonant inductors in each phase in parallel. The proposed method can automatically share the load current without any additional circuit...
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