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This paper proposed an improved dual-edge modulation (IDM) for digital average voltage (DAV) controlled switching converters. The DAV control can regulate the output voltage of switching converter without a PI compensator. Different from the conventional symmetrical dual-edge modulation (SDM) method, the IDM has double sampling points in one switching cycle, which ameliorates the transient performance...
Wide bandgap (WBG) semiconductors owing to their low loss and high switching capability, are gradually adopted in high power-density high efficiency applications, and impose new challenges from control to hardware design. In this paper, a Gallium Nitride (GaN) HEMT plus SiC diode based Vienna type rectifier is proposed to serve as the power factor correction stage for a high-density battery charger...
A single-inductor dual-output (SIDO) buck converter with adaptive freewheel current and hybrid mode control is presented in this paper. It operates in pseudo-continuous conduction mode (PCCM) with single freewheel phase to reduce switching loss and minimize cross regulation. Freewheel current adjustment is implemented by detecting and control freewheel time, which can extend the load range and improve...
This paper proposes a sensorless matrix-converter IPMSM drive system based on detecting the PWM switching-state current-ripples. By detecting the current-ripple of each PWM switching-state, the rotor position of the IPMSM can be estimated. As a result, the circuit of high-frequency sinusoidal voltage or current source is not required. A nonlinear controller is proposed here. The proposed nonlinear...
Multilevel converters are expected as a fundamental solution to harmonics and EMI problems caused by power converters. In general, the multilevel converters generate the output voltage using voltages of internal capacitors or floating voltage sources. From the practical point of view, implementation of the source of multilevel voltage without increase in the volume of the converter is strongly desired...
The problem of cascaded control system design for a Cuk converter is discussed where control system consists of three feedback loops. In the first one the input current control is provided by means of pulse-width modulated (PWM) proportional-integral (PI) controller. In the second one the voltage across capacitor for transferring energy is regulated by PI controller. Finally, in the third one the...
Current-mode control is commonly used in buck converters. Many current-mode buck converters with variable-frequency controllers have been published for smaller inductance and maintaining efficiency via fast and slow frequency, respectively. However, bandwidth of the current-mode buck converter with fixed compensation coefficients is limited by the lowest switching frequency, thus decreases transient...
The EER (Envelope Elimination and Restoration) architecture is high efficient power control method for high frequency power amplifiers. The EER architecture has a feature of high efficiency operation for the high PAPR system such as QAM and OFDM. However, due to slow transient attenuation of the tuned power amplifiers, actual EER system cannot achieve expected power level and efficiency. In order...
Double pulse test (DPT) is a widely accepted method to evaluate the switching characteristics of semiconductor switches, including SiC devices. However, the observed switching performance of SiC devices in a PWM inverter for induction motor drives (IMD) is almost always worse than the DPT characterization, with slower switching speed, more switching losses, and more serious parasitic ringing. This...
Closed-loop control and modulation of AC drives with offline computed optimized pulse patterns can be achieved by manipulating the time instants of the switching transitions. During torque steps, faults and low-voltage ride through operation, however, the transient response time is often rather slow, due to the absence of an appropriate voltage vector. By inserting additional switching transitions,...
For more than 20 years modern developments of auxiliary power converters (APC) for railway applications have focused on demands for low dimensions and mass, higher efficiency and simplified maintenance. Currently under an increasing number of electronic loads, requiring high-quality electric energy and under the ever increasing running distances of locomotives a requirement of high reliability becomes...
The EER transmission system was introduced to exploit high efficiency switching power amplifiers in the high PAPR transmission systems such as QAM and OFDM. However, due to transient attenuation characteristics of the tuned switching power amplifiers, EER systems suffered from low power efficiency in the actual transmission systems. EPWM architecture was introduced to improve power efficiency of the...
This paper highlights performance and efficiency benefits using time optimal control (TOC) in a synchronous buck converter, over an optimally tuned current mode control (CMC) for a step reference transient. An approximate second order closed loop model is obtained for CMC using type-II compensation, and critical performance limits are derived using a normalized framework. Under frequent step change...
This paper presents a model predictive-based current control for PMSMs. In our approach, a reference voltage to an inverter can be strictly treated as a discrete voltage vector so that the output saturation of the inverter is avoided. Various constraints can be also taken into consideration in our approach. Both tolerance ranges for control variables and number of switching operations are incorporated...
The paper deals with design, simulation analysis and experimental verification of electrical properties of resonant converter with LCTLC resonant network. The LCTLC topology belongs to multi-element resonant topologies. The converter consists of the two resonant tanks and HF transformer. The paper shows the design of the resonant elements and shortly the design of HF transformer. First the topology...
This paper proposes a new concept of adaptive ramp generation to enhanced the transient response of PWM voltage mode buck converter. Based on a simple ramp slope controller, the proposed adaptive ramp generator can output ramp with different slopes to accelerate duty ratio adjustment so as to reduce the voltage variations (voltage spikes) and the transient recovery time. A PWM voltage mode buck converter...
The control of boost converters using traditional linear techniques features fixed switching frequency and a simple implementation. Due to its characteristic non-minimum phase behaviour, the dynamic response can be improved only to a limited extent. On the other hand, excellent dynamic performance can be achieved with boundary controllers in which the demands placed on processors and sensors are greatly...
An authentic mode-toggled detector (AMTD) technique is proposed to achieve load and line regulations in a proposed buck-boost (BB) converter. In the case of load transient, conventional BB converter will oscillate and cannot settle to a wellregulated output voltage owing to the on-resistance of the power MOSFETs. Accurate and expeditious mode-toggled detection in the BB converter meet the requirements...
This paper proposes a single inductor dual output (SIDO) DC-DC Converter with exclusive control circuit. We propose two kinds of SIDO converter: a buck-buck and a boost-boost converter. We have simulated and experimented with exclusive control method. Dual voltage outputs are controlled exclusively, using error voltage feedback. This approach requires no current sensors and does not depend on the...
In this paper, Parallel system of DC-DC Converter applied to DC distribution system for building Applications. Power supply device of DC distribution needs a large power system that is requires Efficiency and reliability of the power conversion systems. If A single converter supplies power to the all load connected to DC grid, Temperature rise, reduction in life of system and capacity expansion is...
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