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A novel sub-module circuit is proposed in this paper based on the controllability theory. At first, traditional full bridge sub-modules (FBSM) of the MMC is modeled as a switched linear system, then controllability of the switched linear system model of the sub-module circuit is studied. It is found that the sub-module circuit is state controllable with only four operation modes adopted in the model...
This paper proposes a transient modeling and analysis method for the fractional-order DC-DC converters in continuous conduction mode (CCM), in which a fractional-order Buck converter is taken as an example. By extending the usage of equivalent small parameter method (ESP), the converter is modeled by a general state vector differential equation. Then by adopting the principle of harmonic balance,...
Wide bandgap (WBG) semiconductors can be used at high switching frequency and have a high breakdown voltage and high junction temperature rating which make them appealing for use in power conversion. This paper sets forth a rigorous multi-objective optimization based design paradigm for a DC generation system. Using this paradigm, the loss versus mass trade-off (i.e. Pareto-optimal front) of the generation...
Based on the fact that both the phase and amplitude characteristics of fractional capacitor are related to its order, the introduction of fractional capacitor will make power factor correction (PFC) more flexible compared with the one using conventional capacitor. In order to verify the PFC function with fractional capacitor, an equivalent fractional capacitor model composed of an inverter and a resistor...
In this paper, a novel flicker-free ac/dc LED driver without electrolytic capacitor is presented. The driver comprises a single-stage boost-forward converter and a bidirectional buck-boost converter, which serves to bypass the low frequency ripple. Therefore, electrolytic capacitor is no longer needed. Compared with other electrolytic capacitor-less topologies, the proposed driver has the advantages...
At rates of 100Gb/s and above, CMOS DSP-based transceivers integrated with high-sampling-rate data converters are critical to realize the phase-sensitive modulation schemes based on coherent detection that are essential to metro and long-haul networks [1]. To support dual-polarization QPSK format, quad low-power DACs and ADCs are needed and precise phase alignment has to be maintained between XI,...
Five-level neutral point clamped H-bridge (NPCH) converter has been found practical application due to its low EMI and high output capacity. However, the unbalanced loss distribution of semiconductor devices in NPCH converter would limit the lifetime and the output capacity. In this paper, a five-level active neutral point clamped H-bridge (ANPCH) converter topology is studied, which is composed two...
A fully integrated, reconfigurable step-up DC-DC switched-capacitor power supply solution for energy harvesting system is presented in this paper. A new series-parallel architecture of step-up switched-capacitor converter with Pulse Skip Modulation (PSM) is proposed. This converter generates a stable regulated output (1.2V) from an ultra-low input voltage of 0.3V–1.2V. The designed converter achieves...
In this paper, a cathode-short MOS-controlled thyristor (CS-MCT) is proposed and fabricated for pulse power application. The CS-MCT is distinguished from conventional MCT (CON-MCT) with a cathode-short structure, which forms an extracting path for hole current at gate-ground (Vg=0 V) and brings about a normally-off characteristic. During the conduction of current in the on-state, the PNPN structure...
A 25–30 GHz 6-bit digital attenuator with high accuracy and low insertion loss by 0.15μm GaAs PHEMT process is presented in this work. An improved structure with a parallel capacitor is applied in the attenuator architecture to enhance the attenuation accuracy. To reduce leakage of the RF signal, a cascade structure is proposed to enhance isolation and compensate the insertion loss simultaneously...
A new method of steady-state analysis for non-integer order DC/DC converters operating in continuous-conduction-mode (CCM) is put forward. First, the periodic and time-variant non-integer order DC/DC converter system is modeled by a nonlinear vector differential equation. Then by combining the principle of harmonic balance and equivalent small parameter method, the vector differential equation is...
The topology of modular multilevel converters (MMC) is investigated in this paper. First, single phase half bridge inverter with split wound coupled inductors was studied, it was found that more voltage levels can be generated by using split wound coupled inductors. Therefore, new MMC topology was proposed by the analysis result, therein, two more diodes were used for each arm, and split wound coupled...
On the basis of summarizing the advantages and disadvantages of present phase-modular three-phase power factor correction (PFC) converters, this paper proposes the phase-modular three-phase isolated bridgeless Sepic and Cuk PFC converter. The proposed converters are implemented by star connection of single-phase isolated bridgeless Sepic and Cuk PFC converter. The proposed converters not only can...
Clock distribution becomes a challenge as clock frequency and chip size keep increasing at the same time. Meanwhile, the distributed effects of the clock channel often show up where clock frequency is high and/or it drives large capacitive loading. In these cases, a standing wave-based structure becomes an attractive technique to deliver a low-jitter clock over a long distance with low power consumption...
This paper presents a novel design to reduce the size of both power dividers and branch couplers using interdigital circuit. The disadvantage of planar dividers and couplers working at low frequency is their large size. To overcome it, a design method by using interdigital circuit is proposed, which consists of two interdigital capacitors and a high characteristic impedance line. The design theory...
This paper proposes a novel high gain DC-DC converter, the core structure of the circuit is a bridge which is composed of two power switches and two equivalent voltage sources. The two equivalent voltage sources are charged in parallel during the two switches turn on and are discharged in series during the two switches turn off, which makes the converter produce high output voltage to realize high...
In many applications, such as motor drives and integrating distribute power sources into a grid, there are two or more ac sources or loads. The conventional solution is to use separate modular multilevel converters, which increases cost and volume of system. Thus, a novel nine-arm modular multilevel converter is proposed in this paper, which operates as two conventional modular multilevel converters...
With the development of photovoltaic (PV), fuel cells and uninterruptible power supply (UPS), high step-up converter plays an important role in them. In this paper, a single switch high step-up DC-DC converter is proposed, which can achieve high voltage gain without extreme duty cycle and huge turn ratios of coupled inductor. The leakage energy of coupled inductor can be recycled and the voltage across...
A novel quasi-Z-source dc-dc converter is proposed in this paper. Compared with the conventional Z-source dc-dc converter, the proposed converter features high voltage gain with lower voltage stress of the impedance network capacitors and has common ground for input and output. Moreover, both the input source current and output load current of the proposed converter are continuous, which provides...
In this paper, a novel high-voltage gain converter is proposed, which is based on passive clamp coupled inductor, and two voltage double cells are added to extend the voltage gain. The voltage stress on the main switch is reduced with a passive clamp circuit; low on-state resistance of the main switch can be adopted to reduce the conduction loss. Furthermore, zero-current-switching turn-on is achieved...
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