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An effective control solution for speed sensorless vector control of induction motor fed by a cascaded neutral point clamped (NPC) inverter is proposed, where the novel SPWM pulse rotation control approach provides a simple way to implement vector control for induction motor when the cascaded NPC inverter is employed. The single carrier is used in the novel pulse control, instead of the multi-carriers,...
In this paper, a predictive non-linear voltage mode control method is introduced to enhance the transient performance of the VR. The proposed control method enables the VR to operate at a lower switching frequency in 250 KHz range for higher efficiency during steady state operation but respond fast accordingly to transient events when necessary. Compare to conventional method, the proposed control...
The ZVS-SVM controlled three-phase boost rectifier can realize ZVS operation for all switching devices. In this paper, the operation principal and design guideline are described in detail. The soft switching restriction is analyzed in particular. The experimental results of a 40 kW hardware prototype are presented to show the superiority of the topology and the reduction on loss.
Two techniques are presented to balance the filter capacitor voltages of a multi-pulse rectifier with active injection operating on a variable frequency supply. The active injector consists of a low-rated, bidirectional switch that modifies the behaviour of a 12-pulse rectifier at either low or high-frequency, resulting in 24-pulse or multi-level PWM operation respectively. The operation of the rectifier...
Burst mode control is applied to improve light load efficiency of LLC converter in this paper. Detailed analysis on characteristic and operation processes of LLC burst mode control with SR is presented. Based on the analysis, some important rules of LLC burst mode control are proposed, which is the key to achieve high light load efficiency. The rules include: the suitable primary and secondary driving...
A charge pump power factor correction (CPPFC) circuit for PT power converter has been proposed according to the circuit topology and the features of PT. The main contributions are as follows: 1) The principle of continuous input current CPPFC circuit and the unity power factor condition have been analyzed; 2) The design method has been put forward and the parameters have been calculated; 3) The Pspice...
The MVAC-SVM controlled three-phase boost rectifier can realize ZVS operation for all switching devices. SVM can be realized with switch device operating at the fixed switching frequency. And the switching voltage stress of all the power switch devices is equal to the DC link voltage. In this paper, a minimum voltage active clamping zero voltage switching SVM controlled three phase boost rectifier...
A new interleaved forward converter, adopting series-input structure with a common transformer reset circuit, is proposed in this paper. Series-input structure distributes the switch voltage stress, which makes it suitable for high input voltage applications. Moreover, since two forward converters share one active-clamp circuit for the transformer reset, its primary structure is simplified. In addition,...
A novel integrated EMI filter structure is proposed in this paper, based on FML foils. It integrates common mode inductors and differential mode capacitors and inductors into a single unit. A novel interleaved flexible multi-layer (FML) foil structure is proposed to overcome the difficulty of enlarging the DM capacitance. A prototype is constructed based on this concept and was put into a front-end...
Busbar structures must first achieve the principal function of a low inductive, multiport interconnection. Therefore, large sheets, very close to each other are used. An interesting issue is to use the inherent capacitive effects of busbars for achieving an integrated EMI filter function. However, this may not cause any inductance degradation. Busbar topology including the ground potential brings...
Input-series and output-parallel (ISOP) inverter system is very suitable for high input-voltage and high output-current power conversion applications. Input voltage sharing (IVS) and output current sharing (OCS) between the modules of the ISOP inverter system are required for its proper work. A control strategy with load current controlled is proposed for ISOP inverter system in the paper to achieve...
A resonant converter suitable for applications having a wide input range is proposed. The proposed converter is a hybrid combination of a half bridge converter and a phase-shift full-bridge converter and they use one leg of switches in common. The secondary sides of two transformers are connected in series with a resonant capacitor in between which forms a resonant tank with the leakage inductances...
This paper introduces an LED drive circuit implemented by series input connected converter cells with a common duty cycle control approach operating from a dc voltage bus. With this structure, low voltage high frequency ICs and low profile components can be applied in high voltage applications. Flexibility is provided for the cells to work under different voltage supply conditions by simply changing...
Due to the high rise in luminous efficiency that HB-LEDs have experienced in the last recent years, many new applications have been researched. In this paper, a streetlight LED application will be covered, using the integrated buck-flyback converter developed in previous works, which performs power factor correction (PFC) from a universal AC source, as well as a control loop using the LM3524 IC, which...
In this paper, a current-balancing converter is proposed herein and applied to driving LED strings paralleled, so as to make the required current shared among LED string. There are two stages of the proposed current-balancing converter. The first stage is one buck converter under constant current control and transfers DC current to AC current, whereas the second stage is passive AC-DC rectifiers with...
This paper presents a new electronic ballast topology used to feed one or more high pressure sodium lamps and it is ideal for poles luminaries with one or more HPS lamps used in private or public lighting. The proposed ballast supplies the lamps using synthesized waveform with fundamental frequency below 1 kHz in order to avoid acoustic resonance and minimize luminous flux oscillation. Control strategy,...
In order to avoid conventional topology's drawbacks, a new topology that the diode rectifier is replaced by the thyristor rectifier and the control strategy of the active voltage quality regulator with variable dc-bus voltage are proposed in this paper. This paper analyzes the circuit topology and control strategy in detail. Then losses and efficiency of the both circuit topologies are compared in...
This paper describes the design, construction and testing of a dual-output power converter concept where only the large components, such as the DC link capacitor and heat-sink, are shared between two actuators which are used sequentially in the deployment of aircraft landing gear. This mutual component approach combines the advantages of dual-use power converters with the flexibility of one power...
Converters that integrate the functions of power factor correction (PFC) and isolated dc-dc conversion in a single power converter have been proposed to reduce the cost associated with operating two separate switch-mode converters. Many low power ac-dc single-stage converters have been proposed in the power electronics literature, but very few three-phase single-stage full-bridge converters and these...
In traditional three-level neutral-point-clamped (NPC) inverters, a major issue is capacitor voltage imbalance, which results in low order harmonics. The compensation of the capacitor voltages often require additional control complexity, which cannot be conveniently implemented. The "alternative phase opposition disposition" (APOD) modulation method used in traditional NPC topologies also...
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