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In this paper, a novel current sharing control strategy, named module link, is used to realize multiple modules paralleled. To achieve this goal, there are three full-bridge phase-shift converters are used as three modules and connected in parallel to feed the load. In this study, three phase-shift control integrated circuits, named UCC28950 made by Texas Instruments Co., are used to control individual...
This paper is focused on the performance and limits of the boost rectifiers with unity power factor, in terms of the total harmonic distortion factor of the current drawn from the power supply. Different values of the prescribed output voltage are taken into consideration. The direct current control based on the output of voltage controller is proposed. The case study of a battery charging station,...
The technology of microgrid has been developed by the progress of new energy technology, the new energy connected to the microgrid by (distributed generator) DG. Microgrid represents the new direction of the power grid as the great complements of traditional power supply network. This paper presents that using several photovoltaic grid-connected inverters as the DG, and control the microgrid by controlling...
In this paper, a DC power supply for wide input-voltage range and multi output, which is applied to both 200-V and 400-V power sources, is proposed. This power supply consists of a flying-capacitor three-level PFC and a LLC resonant three-level DC/DC converter. In the PFC, the circuit topology enables to use 600-V devices, minimize the detection circuit and the gate drive circuit, and reduce the size...
The modular multilevel converters (MMCs) are composed of many sub-modules(SMs) connected in series. Module control unit is key components of the SMs, and a auxiliary power supply is needed to energize the module control unit. However, Many MMCs projects require the voltage of IGBT to be higher than 3300V, which means the input voltage of auxiliary power supply used in MMCs should be higher than 2500V...
This paper focus on energy efficiency comparison and analysis of different DC power distribution mode for large data center. First, several single-module DC power supply systems with different voltage level and power capacity are applied to substitute for UPS based AC distribution mode for a typical data center of high-tech park with many enterprises. Secondly, system efficiency, power supply loss...
This paper describes design and development of Pulsed Power DC-DC converter called Pulsed Power Supply Unit for Transmit/Receive Integrated Module of L-band SAR. This paper presents topology selection, design challenges and use of bias winding for feedback. Novel feature of this design is that by using bias winding for feedback overall efficiency is improved and excellent regulation of Tx outputs,...
As aviation power supply is developing to be increasingly integrated, by sharing the same main circuit, AC and DC dual output can be achieved through the same power supply to greatly improve power integration and power density. However, transformation ratio and transformer leakage in AC conversion can cause voltage drop in DC output and thus fail to meet the rated voltage of aviation DC power. To...
When power frequency alternating voltage was used to heat soybean milk, electrode surface was corroded. Aiming at this problem, a high frequency and high power supply based on ARM microprocessor was designed. This power supply consists of ARM microprocessor, human-computer interaction interface, direct current power module, inverter device and data acquisition device. And it could change direct voltage...
This paper presents an approach to design a DCM controller for digital DC-DC step-up converter running in a traditional 16 bit, low consumption and 3 V powered microcontroller, whose purpose is to regulate its own power supply from an input energy source around 1 V. Starting from the performance specifications, it's described the controller parameters determination through a step-by-step procedure...
In this paper, author proposes study of two-loop voltage mode controlled (TVMC) buck converter for improved transient and dynamic performance under line and load disturbances. Buck converter with voltage mode control will improve efficiency, but transient response is sluggish. It requires large filter capacitor. Two-loop voltage control technique is proposed to improve output voltage regulation irrespective...
This paper introduces a digital multi-mode boost converter with wide range of input voltage for an energy recycling load system. The boost converter is controlled digitally with constant off- time/constant frequency hybrid pulse width modulation (PWM) control. Constant off-time control is to avoid the limit cycle oscillation and gain a high gain when the input voltage is far less than the output voltage...
Modular multilevel converters (MMCs) require isolated power supplies at their cells (modules). For high voltage MMC cells with considerable power consumption, simple flyback converters are no more applicable as power supplies; however, input-series output-parallel (ISOP) flyback converters are suitable provided that simplicity and cost-effectiveness are preserved. In this paper, a simple 100W 2.8kV-to-36V...
The modified emitter follower compensation circuit is discussed and the principle of a slop compensation circuit is also analyzed. Focusing on transformer primary side existing current peak when duty ratio of peak current-mode control power converter is higher than one half. Theoretical analysis shows that this circuit can eliminate the phenomenon of current peak, increased the range of the duty ratio...
For the requirements of the aircraft equipment to power supply, it is necessary to research the high voltage DC-DC power converter module. In this paper, firstly it is researched that the topological structure of the HVDC (High Voltage DC-DC Converter), then design of the start circuit based on the control chip TL3844 and the calculation method of the components parameters are presented. Finally it...
This paper presents a new circuit topology for electromagnetic stirring (EMS) systems based on Z-Source inverter that can boost voltage while lowers the harmonic distortion of rectifier input current. Z-Source modulation index can control the output voltage of inverter proportional with load changing in EMS systems. Simulations were carried out and the results show the performance of proposed circuit...
The main scope of this work is to design a low cost programmable DC power supply unit for electronics laboratory. The system designed provides a low cost solution with specifications needed for electronics laboratory. The power supply unit is an open loop control system which is designed using a buck regulator IC and the controller uses PIC24FJ64GA002 microcontroller which provides control signal...
Power supplies prepare for a power failure often apply converters in the input side, and use inverters in the output side. The input side and the output side of power supply are coupled by high frequency transformer. This method requires a transformer. Because the switch devices included in the power flow increase, the power conversion efficiency declines. Though, high frequency transformer-less circuits...
This thesis mainly introduces a kind of soft switching technology which is named as phase-shifted full-bridge zero voltage PWM control technology, the basic working principle of power factor correction Boost converter and an control chip UC3854 commonly used by Boost converter. The paper designs an control circuit of Boost converter based on UC3854, moreover, it puts forward an improved PFC circuit.
A method of current harmonic suppression and voltage waveform improvement in power supply system is introduced. The key technology is to control the rectifier's input current, which includes reversed components of harmonic current, and part of them will be eliminated, while the voltage will be drifted toward the sinusoidal waveform. Direct digital control technique is employed in a switching power...
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