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The boost topology with ripple cancellation network allows input and output current ripple attenuation, which means the suppression of the input filter and a high reduction of the output filter. However, to achieve the ripple cancellation, the complexity and the number of components of the converter increase compared with the conventional boost. A detailed analysis has been developed to specify the...
A novel wide range input front-end dc-dc converter featuring in optimized overall input range efficiency is presented in this paper. This proposed converter combines the two kinds of dual switch ZVS forward-flyback topologies together, while the DC Gain for these two kinds of forward-flyback topologies is different and that of secondary full-bridge rectifier is doubled than current-doubler rectifier...
The full-bridge series-parallel resonant converters (also known as LCC resonant converters) with capacitive output filter is evaluated in high output voltage (>50 kV), high power (>50 kW) and high frequency (20 kHz) ESP (Electrostatic Precipitator) power supply applications. By using the leakage inductance and the winding capacitance of the transformer as the resonant elements only an additional...
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...
A line-interactive UPS has a higher efficiency than double conversion topology. It also has lower cost and size. Nevertheless, the transfer time between modes is an important drawback which makes impossible for line-interactive UPS to be implemented in certain applications. During this transfer time, which the UPS needs to detect the grid disturbance and to establish the stored-energy mode of operation,...
This paper presents the application of the One-Cycle Control technique to a single-phase three-leg three-level unified power quality conditioner. The system does not use any matching transformer and has a reduced number of components, since it has only three legs. Besides having a power factor close to unity, the proposed system has fast response, stability, robustness, reduced voltage stress applied...
In the course of the more electric aircraft program active three-phase rectifiers in the power range of 5 kW are required. A comparison with other rectifier topologies shows that the three-phase Delta-switch rectifier (comprising three Delta-connected bidirectional switches) is well suited for this application. The system is analyzed using space vector calculus and a novel PWM current controller concept...
The paper presents the design of an active load for electronic welding machines. The active load's main purpose is to reduce the amount of electrical energy that is wasted during the welding equipment burn-in tests, allowing a large fraction of it to be re-circulated through the utility grid. The converter needs to operate with low input voltages, typically a few tens of Volts, and high input currents,...
A novel power electronic load (PEL) is introduced in this paper. This equipment can simulate R,L,C load as well as non-linear load. Furthermore, it can recycle the energy back to grid. Topology for single phase AC PEL, three-phase AC PEL, and DC PEL are presented firstly. Based on disadvantages of repetitive controller, an improved repetitive controller is presented to improve the dynamic performance...
This paper presents an extension of direct duty ratio pulse width modulation (DDPWM) to various topologies of matrix converters. In DDPWM, by using the concept of average over one switching period, the duty ratio which is compared with the triangular carrier waveform can be obtained so as to synthesize the desired output voltages. Owing to the per-phase modular structure of the DDPWM method, it can...
As proven in literature, the Z-loaded rectifier is an alternative topology for PFC applications requiring wide output voltage controllability. The main advantage of the Z-rectifier is the availability of two control signals allowing buck-boost operation. This raises the possibility of regarding the Z-rectifier as a novel single-stage PFC converter with ripple-less output regulation, whereby one control...
Multilevel inverters are traditionally seen as a step forward in DC/AC conversion, providing more output voltage levels, better quality of the generated waveform and lower switching losses than the two-level and can process higher voltages with a given forced commutated switch technology. There are also drawbacks associated with this technology: more switching devices and associated gate driver circuitry,...
Power electronic inverters are becoming more and more popular for various industrial drive applications. Many kinds of multilevel inverter topologies have been proposed to enhance the performance of motor drive system during last two decades. In this paper, a sensor-less drive of induction motor based on a new hybrid cascaded multilevel and SVM controls are presented. In the proposed drive system,...
This paper investigates six three-leg single-phase to single-phase dc-link converters employing three-level and two-level legs. The pulse-width modulation techniques and a control technique that aims at maximizing the utilization of the DC-link voltage are presented. In addition, several relevant characteristics of the converter are addressed, such as voltage capability, harmonic distortion, shared-leg...
A novel three-phase single-stage boost power factor correction (PFC) converter topology is presented. The converter operates in discontinuous conduction mode (DCM), and the PFC function is realized easily with the peak of input current following input voltage automatically which is the same as that of the traditional single switch three-phase boost PFC. Compared with the single switch three-phase...
This paper describes a three-phase high power factor rectifier for an electrolytic capacitor-less inverter based on the current injection scheme. The rectifier injects the machine side zero sequence current into the grid side through three bi-directional switches. This paper also introduces the modified circuit topology which is suitable for an electrolytic capacitor-less inverter. A bulky dc or ac...
This paper proposes three topologies of drive systems to supply independently two induction machines. A commercial three-leg inverter connected to a photovoltaic energy source have been used to supply both motors. The proposed two-motor drive systems are seen as a potentially viable solution for remote applications requiring one high-power (three-phase machine) and one low-power machine (single-phase...
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...
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