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An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
A new asymmetrical hybrid multilevel inverter topology is presented. The new topology improve the number of the output voltage level greatly through cascading two five-level H-bridge cells. A hybrid PWM strategy is proposed for the new topology that the switches of different cells works in different switching frequency to low switching losses. Lastly, an experimental 17-level asymmetrical inverter...
The LC resonance in the traditional passive quasi resonant soft switched Zero Voltage Switching (ZVS)-SEPIC converter, together with the adoption of pulse frequency modulation leads to the complex control and high electrical stress of its electronic components. In order to resolve this issue, the use of an active clamped topology for the ZVS-SEPIC is proposed. With this technique, the resonant effect...
The high efficiency power management IC (PMIC) with switching device is presented in this paper. PMIC is controlled with PWM control method in order to have high power efficiency at high current level. Dynamic threshold voltage CMOS (DT-CMOS) with low on-resistance is designed to decrease conduction loss. The threshold voltage of DT-CMOS drops as the gate voltage increases, resulting in a much higher...
This paper proposes a digital implement method of selective harmonic elimination pulse width modulation (SHEPWM) based on digital signal processor (DSP). First, the switching angles for eliminating selective harmonics are calculated with computer-aided software, and functional relationships between modulation indexes and switching angles are obtained. The curve fitting technique is then used to fit...
Random carrier-frequency (RCF) modulation has been applied to DC/DC converters, reducing conducted EMI significantly. The selection of the duty cycle is critical in terms of suppressing EMI level in RCF modulation. But limited related literature is available. In this paper, we analysis the effect of duty cycle on suppressing EMI level by deduced the expression of the amplitude of switching voltage...
This paper presents a novel model for average current control that can be applied to the buck-cascaded buck-boost converter (BuCBB) with two independently controlled switches in universal input power factor correction (PFC) circuits. The proposed BuCBB PFC model consists an averaged BuCBB topology with all the switching elements replaced by dependent sources and an average current control scheme with...
With the increasing of the wind turbine capacity, inverter paralleling is one of the best approaches for MW-level wind power converter system design. This paper presents a new control algorithm for paralleling inverters based on SVPWM, which can reduce the output harmonic currents and inhibit the circulating current between the inverters. The detailed algorithm principles and mathematic derivations...
This paper proposes a novel Zero-Current-Switching (ZCS) Pulsewidth Modulation (PWM) switch cell, featuring ZCS of all switches and zero-voltage -switching (ZVS) of all diodes at entire load range.The additional current stress and the conduction loss of the main switch and diodes are minimized. Based on the presented ZCS-PWM switch cell, a novel family of ZCS-PWM converters is derived, which is suitable...
This paper introduces a new soft switching current-fed DC-DC power converter. A clamp circuit in this converter provides soft switching condition for all switches and absorbs the voltage spikes of main switches at turn off instance. This converter contains four switches, two main switches and two auxiliary switches. Since all switches operate under soft switching condition, this converter can operate...
This paper proposes a novel ZCT (zero-current-transition) PWM full-bridge DC-DC converter. The proposed converter can achieve ZCS (zero-current- switching) for all the active switches in the entire load ranges, also it realizes soft commutation for the output rectifier diodes. Furthermore, the auxiliary circuit also helps to turn on the main switches softly. Soft-switching operational principle is...
The developed switched reluctance starter/generator system in low voltage is presented, which is made up of the three-phase 12/8 structure double salient reluctance machine, three-phase asymmetric bridge single polarity power converter and the controller. The three-phase 12/8 structure double salient reluctance machine, the three-phase asymmetric bridge single polarity power converter and the control...
This paper presents a digital implementation of two-axis position control of microstepping bipolar drive with the controlled current, depending on the load torque applied. The topology of power converter for each motor is the conventional three-phase inverter, using space-vector pulse-width-modulation (PWM) technique. It is well known that the microstepping technique allows the stepping motor rotating...
Based on the working conditions and development trend of operating mechanism of high-voltage circuit breaker, this paper presented a high-load adjustment rate of portable high-frequency switching power supply designed for high-voltage circuit breakers test. The main circuit topological structure is analysed in detail, which uses the fullbridge circuit and IGBTs (insulated gate bipolar transistor)...
The matrix rectifier described in this paper can realizes three-phase AC voltages to a DC output voltage and can work as a power factor correction converter. The paper presents an SPWM control strategy based on virtual DC link for AC/DC matrix rectifier with high frequency link. The matrix converter in the paper can be equivalent to a virtual rectifier and a virtual inverter. The proposed control...
Using the state-space average modeling method, a nonlinear affine model of Boost converter working on current conduction mode (CCM) is set up. Based on the input-output linearization method of differential geometry theory, the internal dynamics of the systems, with output represented by the input inductor current and the capacitor voltage respectively, are been studied. It is pointed out that the...
Multilevel converters have excellent performance in power application, especially in high-power medium voltage fields. To find an effective and general strategy for multilevel and multiphase system is a challenge attracting many researchers. This paper analyses the basic analytical meaning of PWM strategy, which is to implement an analog continuous reference value by means of several available discrete...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
Based on control type soft switching, an interleaved three-phase bidirectional DC/DC converter for high voltage high power applications is presented. The converter main circuit uses the interleaved three-phase bidirectional DC/DC topology and takes use of the three-phase complementary PWM control to implement soft switching condition. The circuit principles, the working modes and control type soft...
Speed control of salient pole permanent magnet synchronous motor (PMSM) is studied based on energy-shaping and port-controlled Hamiltonian (PCH) system theory. Firstly, the PCH speed control model of PMSM is established. Secondly, the desired equilibrium point of the system is obtained based on maximum torque per ampere (MTPA) control principle. Then the speed controllers are designed when the load...
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