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This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage...
In this paper, a resonant switched-capacitor dc-dc converter is proposed for data center application. The proposed converter possesses features such as high efficiency, high power density and light-weight. Zero current switching (ZCS) can be achieved with the resonant operation, which allows the converter operating under high efficiency. Proper switching device selection and in-depth power loss analysis...
This paper presents comparison of GaN based switched-tank converter (STC) and traditional cascaded voltage divider (CVD) dc-dc converter for data center applications. The operation principle of two kinds of converters are presented. And simulations with Saber are both conducted to verify the proposed comparison, respectively. The system volume and efficiency are fully compared via GaN based device...
This paper discusses a GaN based motor drive topology with a high conversion ratio and sinusoidal output voltage. This inverter topology is based on the z-source inverter and provides many benefits over the traditional three-phase inverter or traditional inverter with a DC-DC boost converter input. The semi-quasi-z-source inverter allows the input voltage source and the load to share a ground so the...
This paper shows a combinational decoupling method to minimize dc-bus capacitance and improve power density for DC to AC applications, especially for single-phase inverters. The proposed method is combined with in-series structure and in-parallel structure together with power equations analyzed. The detailed control strategy is given. The simulations are conducted via PLECS software to prove the theoretical...
This paper presents a review on SiC MOSFET based 3-phase inverter lifetime prediction. The inverter-level lifetime prediction flowchart is first illustrated with the system failure rate and system Mean Time to Failure derived which integrate five in-series stresses. An overview of SiC MOSFET power module Physics-of-Failure is then presented. Following it are the step-by-step lifetime modeling comparison...
This paper presents a 3-phase dc-link capacitor RMS current reduction method by increasing paralleled inverter module number for segmented traction drive. Compared with the existing 2-module paralleled system, this paper investigates increasing paralleled module number can further reduce the value of dc-link capacitor RMS current. The results show that 2 paralleled modules can reduce ∼45% and 3 paralleled...
This paper presents a modular multilevel dc-dc converter (MMC) with zero-current switching (ZCS) feature and its analysis for medium-voltage direct current (MVDC) applications. The main focus of this paper is analyzing the overall efficiency of the proposed MMC and experimentally verifying the theoretical analysis on operating principle. Furthermore, in order to achieve high efficiency, the proposed...
This paper presents a novel modular multilevel switched-capacitor based resonant converter (MMSCRC) to achieve dc-dc power conversion function. In comparison to existing multilevel modular switched-capacitor circuits, the proposed switched-capacitor resonant converter (SCRC) possess voltage regulation capability. Its modular structure accomplishes voltage conversion function and proposed closed-loop...
This paper presents an innovative resonant multilevel modular bidirectional dc-dc switched-capacitor converter based on GaN switching devices. Proposed converter achieves the following advantages; soft switching, low voltage device rating, boost or buck mode, common ground, high conversion ratio, variety of environment temperature operation, simple control algorithm and modular structure. The proposed...
This paper presents high-power-density inverter with pulse current injection power decoupling method. In order to reduce the dc-link capacitor significantly, dc-link current is fully analyzed with double Fourier method in theory. Compared with the traditional 2nd harmonic power decoupling method, the pulse current injection method considers not only 2nd order harmonic but also the higher order harmonics...
In this mobile era, people have become increasingly dependent on smart devices. Smartphones have emerged as the most popular smart computing device. However, numerous security issues affecting smartphones have been exposed. In recent years, mobile network traffic based approaches have been proposed to identify malware malicious behaviors, but these approaches, especially the approaches using machine...
Actuator plays an important role in the Flight Control System of UAV (Unmanned Aerial Vehicle), so it is necessary to diagnose the fault in real time. This paper analyzed the operating principle of UAVs actuator, on this basis the analytic model is established to operate state monitoring and fault diagnosis, and designed a threshold-improved SPRT joint algorithm to extract the characteristic of fault...
This paper presents a new bidirectional multilevel modular switched-capacitor dc-dc converter for high voltage and high conversion ratio application with low capacitor voltage rating. For the high voltage and high conversion ratio application, high voltage capacitor with good performance will not be available either, like the switching devices. For the traditional multilevel modular switched-capacitor...
Multimedia content is increasingly available in multiple modalities. Each modality provides a different representation of the same entity. This paper studies the problem of joint representation of the text and image components of multimedia documents. However, most existing algorithms focus more on inter-modal connection rather than intramodal feature extraction. In this paper, a simple yet effective...
To further improve the safety and reliability of small unmanned aerial vehicle (UAV), triplex redundancy flight control computer and its strategy of redundancy management were designed. And considering the limitations of communication speed and data communication load of traditional CAN bus, FlexRay-based communication mechanism has been designed. Specifically, mosular hardware has integrated the...
Popularity of surveillance and mobile cameras provides great opportunities to video-based face recognition (VFR) in less-controlled conditions. This paper proposes a joint space learning method to simultaneously identify the most representative samples and discriminative features from facial videos for reliable face recognition. Specifically, we use a mixture modal by learning multiple feature spaces...
In this paper, in order to improve the in-series power decoupling circuit, an in-series and -parallel method is proposed to further reduce the extra capacitor without performance penalty. Based on DC-side in-series method and AC-side three-leg method, a novel way is given to not only reduce the DC-link capacitor but also to decrease the extra capacitor. Thus, it could further make the system high...
This paper presents a high-efficiency and low cost linear LED driver with concave current control method for low power applications. In order to achieve a high efficiency of the linear LED driver, control methods with three different current shapes, namely, traditional flat and convex current shape, proposed concave current shape, have been discussed and compared via theoretical analysis. It is concluded...
This Paper presents a new modular multilevel converter (MMC) concept to achieve high ratio DC-DC power conversion purpose. This converter can be deployed in High-voltage direct current (HVDC) system, or it can be used as a Solid-state Transformer (SST). The proposed converter is flexible, reliable and it possesses scalability and simplicity. The conversion ratio can be regulated by the phase-shifted...
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