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A 300 W and 100 kHz single phase soft switching power factor correction (PFC) circuit is developed with a new active snubber cell. This active snubber cell provides Zero Voltage Transition (ZVT) turn on and Zero Current Transition (ZCT) turn off for the main switch without any extra current or voltage stresses. The active snubber cell component values are defined by optimization process to minimize...
It is difficult to improve power capacity and switch frequency of the conventional switching power system because of so many drawbacks resulting from the hard switching state of power switches such as the losses and the diode reverse recovery problem and so on. In this paper, a novel ZVZCS (Zero Voltage Zero Current Switching) PWM (Pulse Width Modulation) Buck converter is proposed. A detailed analysis...
In this paper, a novel active clamp Flyback-Forward converter is proposed for large voltage gain and high power applications. The interleaved configuration on the primary side is employed to handle the large input current. An improved voltage doubler configuration is adopted on the secondary side to make the output diodes sustain only half of the high output voltage. Furthermore, the output diode...
In this paper, a simple method to obtain the frequency response of a switching DC/DC converter is proposed. The Bode plot is obtained from a single simulation in the time domain using the switching model of the power converter, and injecting a multisine perturbation. The procedure to generate the perturbation, simulate the converter and post-process the response is explained. It is applied to several...
An efficient method for ripple analysis of networks with synchronized switching power converters is proposed. While the focus of previous publications is on the operation of a single power converter, the proposed method extends the steady-state and ripple analysis to the area of power converter systems. A network consisting of several converters is modeled as a single piece-wise linear system. The...
This paper presents the design of simple but powerful soft switching scheme for a DC-DC Boost Converter with a closed loop control. A new novel soft switching scheme is proposed with a single switch and minimum components which offers load independent operations. Here only one switch is used in this converter which is switched ON at zero current and switched OFF at zero voltage. The proposed Controller...
In this paper, a high efficiency Soft-switching Boost Converter is proposed with a Simple Auxiliary Resonant Circuit (SARC), which is composed of an auxiliary switch, a diode, a resonant inductor, and a resonant capacitor. The Conventional Boost Converter decreases the efficiency because of Hard-switching, which generates losses when the switches are turned ON/OFF. During this interval, all switches...
With the increase of switching frequency, dissipation of switching device became one of the most important factors which constrained the efficiency of DC-DC converter. A phase-shifted full-bridge circuit which based on the phase-shifted quasi-resonant converter was introduced in this paper. We developed a switching power supply prototype for 1000W. Some specific circuits, waveforms from the saber...
In recent years, more and more researches show that hard switching mode has limited the switching frequency in converter and full-bridge zero-voltage PWM soft switching (ZVZCS) converter existing the phenomenon of duty cycle loss seriously. This paper introduces full-bridge zero-voltage and zero-current PWM soft switching converter's main circuit topology and working principle. Because one of characteristics...
A novel single-switch three-level (TL) converter is proposed for dimmable LED lighting. Compared with standard TL converters, the proposed topology not only maintains the advantage of using a lower voltage rating power switch that is rated half the input voltage, but also eliminates one active switch and its associated driving circuit. Moreover, it can naturally solve the voltage stress imbalance...
This paper presents a look-up table based digital control approach to on-line efficiency optimization over wide ranges of operating conditions. The proposed digital controller allows programmable modes of operation based on off-line efficiency characterization and optimization. Applied to a flyback dc-dc converter, the controller adopts valley switching in discontinuous conduction mode (DCM), which...
A new auxiliary circuit that can be implemented in dc-dc and ac-dc ZVS-PWM converters is proposed in the paper. The circuit is for ZVS-PWM converters used in applications where high-frequency operation is needed and the load current is higher than that of typical ZVS-PWM converters. In the paper, the operation of a new ZVS-PWM converter is described, its steady-state operation is analyzed, and a procedure...
This paper proposes a bidirectional multilevel dc-dc converter for applications that require high voltage gain. Some of conventional multilevel dc-dc converters have diverse voltage or current stresses for the switching devices within the circuit, not suitable for modular configuration or for high efficiency demand; some suffer from relatively high power loss or large device count for high voltage...
Electronic loads (E-Load) are commonly used to test power supplies. In order to test computer power supplies, the E-Load must possess an ideal controlled current source property which draws a desired load current even in the case of a very low terminal voltage of the Source-under-test (SUT). It also needs to have superior dynamic performance to simulate high slew rate load transients. This paper proposes...
With respect to the deficiency of the output modeling, topology modeling and switching function modeling of the STATCOM, this paper states the voltage regulating principle of the STATCOM and analyzes the switch characteristics of the voltage source converter controlled by the SPWM, then deduces the duty ratio of each switches based on the switching function. Then, introduces the switching system concept...
This paper presents a soft-switching (ZVS) boost converter integrated in such a way to obtain, in a single conversion stage, the maximum energy extraction from photovoltaic panels, battery charging and discharging dynamic control, and high voltage step-up to the inverter DC bus, also operating with soft-switching capability. In order to verify its effectiveness, experimental results from this converter...
In this paper, a voltage multiplier cell with built-in transformer is inserted into the conventional single switch boost converter, which can extend the voltage gain by regulating not only the duty cycle, but also the turns ratio of the built-in transformer. Furthermore, the switch voltage stress can be reduced greatly by increasing the turns ratio of the built-in transformer. Therefore, the switch...
This paper studies boundary control for a multiple-input buck-boost (MIBB) converter topology with equal voltages at each input leg. In addition to not requiring different input voltages as in previously suggested MIBB converters, when input voltages are equal the proposed controller eliminate the need for forward-conducting bidirectional-blocking switches (FCBBs) also present in previous MIBB topologies...
Cascade distributed power architectures include tightly-regulated point-of-load converters that exhibit instantaneous-constant-power-load (CPLs) characteristics. Boundary control is investigated for dc-dc boost and buck-boost converters that feed these instantaneous (CPLs). Without adequate controls, the destabilizing nonlinear effect of the CPL inverse-voltage term leads to significant oscillations...
In this paper, a buck resonant voltage divider (BRVD) with bidirectional operation considered is presented with the fixed switching frequency all over the load range, which can be used as the first stage of the bus converter. The proposed buck resonant voltage divider with open loop control can obtain about half of the output voltage created from the resonant voltage divider. Above all, all switches...
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