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This paper proposes a digital online efficiency optimization technique for DC/DC Dual Half-Bridge Series Resonant Converters. The proposed technique implements an advanced modulation scheme which exploits the degrees of freedom inherently available in the converter modulation space in order to simultaneously regulate the output voltage and maintain the system in its maximum efficiency point. Furthermore,...
One of the main technical challenges of the Modular Multilevel Converter (MMC) for medium-voltage adjustable-speed motor drive applications is the large magnitude of the SubModule (SM) capacitor voltage ripple under low-speed operation. This paper proposes two new techniques to reduce the magnitude of SM capacitor voltage ripple of the MMC for motor drive applications. The paper presents a comprehensive...
This paper presents adaptive ripple-based constant on-time control architecture for buck converter ICs with wide duty ratio applications. An internal ramp compensation with emulating inductor current ripple is implemented to solve the ripple oscillation instability issue when using low-ESR output capacitors in buck converters. Therefore, no external compensation is required to simplify the system...
An input filter is usually required in a power supply system in order to comply with regulations, reduce EMI, and ensure that input transients are properly handled. In systems with a single input power supply and multiple output converters, the phase positioning of the converters affects the input current/voltage ripple as well as the magnitude of the input harmonics. Optimizing the phase positioning...
The losses of realistic litz wires are characterized while explicitly accounting for their construction, using a procedure that computes the current-driven and magnetic-field-driven copper losses using fast numerical simulations. We present a case study that examines loss variation in one- and two-level litz wires as a function of twisting pitch, over a wide range of values and in small increments...
An optimize design process of inductors and transformers used in switching power converters is presented in this paper. An analytical modeling of conductor physical behavior was developed to match optimization requirements, and used to compare various components with different cores — coils geometries and wire technologies. Rigorous analytical modeling was applied to achieve minimization of the losses,...
Traditional induction heating cooktops typically employ a circular planar coil in resonance excited by a switching inverter. This configuration results in stray magnetic fields below the coil and non-uniform heating profile on the top. This paper presents the concept of multiphase, multi-resonant induction heating using a Halbach winding arrangement to eliminate the shortcomings of the traditional...
Typical AC traction drive electrical components include the motor, inverter, dc link and filter elements. Drive design parameters and component values are chosen to minimize system-level drive losses. This paper presents a systematic approach for selecting rotor flux magnitude and passive component values in an induction motor drive using a comprehensive loss-minimization algorithm. The total losses...
In this paper, a new post-fault modulation strategy is proposed to operate the direct matrix converter (MC) as close as possible to its desired normal operating under an open-switch fault condition. The proposed strategy determines the switching states of the eight, out of the nine, remaining healthy switches of the converter, to generate the reference voltage. The corresponding duty cycles of the...
This paper proposed the design and optimization of parallel DC-DC system for high power applications. A current-driven phase shift full bridge (CD-PSFB) converter with fewer components, lower voltage stress and no snubber is chosen as one of the modules in parallel system and several attractive features that are fit for parallel are analyzed in detail. The amount of CD-PSFB module is first selected...
This paper presents an optimization technique for a flyback converter with a bidirectional energy transfer. The main goal is to optimize the converter for driving an incremental dielectric electro active polymer actuator, which must be charged and discharged from 0 V to 2500 V DC, supplied from a 24 V battery. The proposed optimization routine sweeps through a database of low voltage switching devices,...
This paper proposes an optimization method to design the parameters of controls for power converters in order to achieve a very fast dynamic response while remaining stable and robust over the desired operation region. The proposed optimization algorithm is applied to different analog controls and is used to compare the dynamic response of the Voltage mode, V2 and V2Ic control for different cases...
A mathematical method is proposed for optimal scheduling lead-acid batteries for cycling use in this work. Typical battery characteristic curves and experiential data, including the discharge rate vs. discharge time, discharge depth vs. cycling times, are first converted into mathematical expressions with consideration of the circumstance temperature. And then through the proposed optimization algorithm...
High efficiency and low cost coil system design is one of the key points for wireless power transfer. In this paper, a optimization method with generic algorithm is presented. The coil track layouts are interpreted with binary strings in the design iterations. Some practical considerations and detailed implementations are introduced in the optimization procedure.
The increase in the number of power electronic applications has led to harmonic pollution of the power grid. Harmonic resonance that can result in severe voltage distortion is a well documented problem. Several suppression techniques have been proposed to solve this problem. This paper proposes a technique to cooperatively operate multiple Active Power Line Conditioner (APLC) installed in the same...
This paper presents the application of a multi-objective optimization method to minimize two conflicting features, power loss and total harmonic distortion, of grid-tied PWM-based cascaded multilevel inverter. These features are similarly important, thus requiring a compromise because of inherent conflict between them. One major challenge is that these features cannot be expressed simply by mathematical...
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