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In this paper we discusses in details the effect of the gate equivalent series resistance, ESR, of switching power MOSFETs on different aspects of loss mechanisms when used in DC-DC converters. The loss mechanisms addressed are current rise and fall times, die current distribution and localized shoot through
A smoothed-power output topology for battery of stand-alone renewable power system (SARPS) using EDLC (electric double layer capacitor) is presented. To prolong the service life of battery, decrease maintenance cost and power loss of SARPS by realizing smoothed-power output supply, an EDLC is paralleled with battery as a part of storage system, and connected by a bi-directional buck/boost compensation...
This paper proposes a new stator section crossing method that can overcome the drawbacks of the tow-step and three-step methods used in Shanghai Maglev railway. This method has no descending of propelling force and idleness of PWM converters. The mathematic model and vector control strategy of the permanent magnetic long stator linear machine (PMLSM) are also researched in this paper. The effectiveness...
This paper proposes a novel single-stage high-power-factor electronic ballast with symmetrical half-bridge topology for fluorescent lamps. The proposed electronic ballast only uses a symmetrical half-bridge topology to procure the functions of a boost power-factor-correction converter and a half-bridge series parallel-loaded inverter. In spite of its simplicity, an excellent performance concerning...
This paper investigates the inductance characteristics of a novel 3-phase 12/10 (12-stator-tooth/10-rotor-pole) flux-switching permanent magnet (FSPM) machine with doubly-salient structure based on finite element (FE) analysis. Firstly, the topology and operation principle of the machine are presented. Secondly, the apparent (static) and incremental (dynamic) inductances are defined. Then, the conventional...
This paper presents a novel prototype of a current source resonant inverter using insulated gate bipolar transistors for driving a streamer reactor, streamer generation technology has been recognized as one of the best methods for water treatment, disinfection, industrial wastes utilization, and so on. However, some technological difficulties related to efficient streamer production have been significant...
A novel current-sharing control scheme is presented for redundant parallel inverters. The control scheme employs the share bus which interconnects all the parallel inverters to transfer synchronous signal and average current signal. Current-sharing of all the parallel modules is realized through distributed average circuit. Average current is subtracted from the output current of each parallel inverter...
This paper investigates the function of DASM (doubly-fed asynchronous machine) with emphasis placed on its ability to the stabilization of the power system. P (active power) and Q (reactive power) compensation from DASM can be determined by fuzzy logic, and regulated independently through secondary-excitation controlling. Simulation results by EMTP show that such system can restore the power system...
Paper bases on the principles of the coupling inductor to illustrate the planar integration of two resonant inductors and one filter inductor in the ZCS buck QRC, all three inductors are integrated in one magnetic core, then the decreasing in the volume and height can be achieved, through comparing the close coupling with the loose coupling, how to achieve the soft switching is discussed, and the...
A circuit topologies family of single-stage parallel uninterruptible AC/DC converter with high power factor is presented. The topology includes four sections, i.e. full bridge rectifier, parallel converter with power factor correction (PFC), uninterruptible power supply and fast output voltage regulation. The converter has lots of advantages such as: single stage power conversion, uninterruptible...
The study of a fuzzy logic controlled, three-phase shunt active power filter to improve power quality by compensating harmonics and reactive power is presented. The advantage of fuzzy controller with self-adjustable factor proposed in this paper is that it is based on a linguistic description and does not require a mathematical model of the system. Furthermore the fuzzy control rules can be modified...
In this paper, dynamic analysis of a current source ICPT system is performed based on the circuit equations of each stage in an operation cycle. From the solution, frequencies of different stages are discussed. Besides a common frequency of the circuit, the other two are resonant frequencies of each side of the transformer. A simplified form of frequency expression is obtained. It is found that in...
This paper presents a new circuit topology of dc bus line switch-assisted half-bridge soft switching PWM inverter type dc-dc converter for arc welder. The proposed power converter is composed of typical voltage source half-bridge high frequency PWM inverter with a high frequency transformer link in addition to dc bus line side power semiconductor switching devices for PWM control scheme and capacitive...
In this paper, a small signal model of a novel ZVZCS FB-PWM DC/DC converter is built and analyzed. A double closed loop controller is employed: the inner loop is a PI controller and the outer loop is a fuzzy logic with integrator controller. The novel control strategy improves the performance of the converter greatly, such as stability, control precision and dynamic response. The dramatic feature...
Based on the time-domain analysis, a time-domain mathematical model of three-phase three-wire active power filter (APF) current control loop is established; Predictive control equation and its optimal feasible solution with minimum objective function value are gotten, and the sliding-mode control strategy of current control loop is deduced. A novel optimization-sliding mode control strategy is proposed,...
This paper presents a variable inductor for single phase system which employs a new control method based on active power filter schemes. The novel variable inductor combines an active power filter circuit and a control circuit. The active power filter circuit is based on a single phase inverter with four controllable switches, a standard H-bridge inverter. The AC side of the inverter is connected...
The stator of the linear magnetic flux compression generator (LMFCG) consists of a helical coil, epoxy (insulator) and a casing, of which the helical coil is the key part. In order to grasp the detailed state about the helical coil under the impact of pulsed current, a 3D solid model of the helical coil was set up and the magnetic-structural coupling analysis of coil was carried out. Some useful conclusions...
An improved direct torque control (DTC) scheme for the matrix converter fed Interior Permanent Magnet Synchronous Machine (IPMSM) is presented in this paper. In the proposed scheme, the modified DTC strategy for matrix converter IPMSM drives is achieved using a variable-structure torque and stator flux controller, and indirect space vector modulation (ISVM) technique. It features low torque and flux...
In this paper, the main reason causing rotor position detection error in sensorless BLDC motor drives that the band pass filters are employed to get the zero-crossings of back-emf is presented. The effects on commutation that result from the rotor position detection error are investigated, and the simulation results are given. The correction method is suggested, and the experimental results are provided
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