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A buck converter, employing a sawtooth feedforward control circuits, is described in this paper. The circuit is simple and can be fabricated in conventional process. Measured results are presented for buck converter with-and without- feedforward control circuit. Experiment results show that the designed buck converter with feedforward control achieves well line- and load-regulation.
This paper proposes a T-S fuzzy model based maximum power control to enhance the efficiency of the solar photovoltaic (PV) system. To draw the maximum power from a solar PV array, a buck converter is applied to adjust the output of PV power. Based on the T-S fuzzy representation, the fuzzy maximum power point tracking (MPPT) controller are developed to maintain the maximum power voltage. The MPPT...
In order to adhere to voltage regulation criteria, capacitor selection of a Buck converter must be based on the worst possible scenario. It is well known that, for a low duty cycle Buck converter, the output voltage deviation of a Buck converter undergoing an unloading transient will be significantly larger than that of a corresponding loading transient of equal magnitude. Therefore, in this paper,...
A nonlinear control buck converter with fast transient response is presented. Methods and principles are analyzed. In the proposed control scheme, the idea of integration is applied and the variable which relates to input voltage and duty ratio is introduced to be compared with the integration variable. The simulations for this design are implemented and simulation results show that fast load and...
A low-power and high-speed ADC is crucial in a digital controller IC design. The Self-Strobe Delay-Line (SSDL) ADC architecture has been used because of its low-power and high-speed characteristics. However, the transconductance gain of the V-I converter in the SSDL ADC have not been optimized to have high sensitivity with low power consumption. In this paper, a differential sensing circuit was designed...
A 100 MHz switching power supply with two-loop control is proposed for radio frequency power amplifiers. The power supply has a tracking bandwidth of 5 MHz and an estimated efficiency of 80%. The two-loop topology consists of a buck converter with an inner loop for one-cycle control and an outer loop that contains a PI compensator. With the two loops a stable feedback control is obtained with an excellent...
This investigation is to design an optimal pulse width modulation form of sliding mode controller for buck converter. In this controller design, the converter parameters and the initial conditions of the state variables are made use of. The Proportional Integral Derivative type of switching surface is chosen and continuous current conduction mode of operation is assumed. The design method is illustrated...
DC-DC switch-mode converters recently have been increasingly used in many EV and HEV applications when the power distribution is in the form of multi-converter DC electrical system due to their good specifications. Different control strategies such as sliding mode control and current mode control have been applied to DC-DC converters to improve their robustness, efficiency, and stability. However,...
An approach to the modeling and regulation problem of a buck converter which relies on its hybrid nature is presented. The buck converter is modeled as a switched affine system. Then, using the stored energy in the inductor and the capacitor as the common Lyapunov function, switching rules and activation region of all the subsystems are defined to assess quadratic stability of the converter. Simulation...
This paper explores digital average current (DAC) control buck converter with dual-edge modulation (trailing-triangle modulation and leading-triangle modulation). It is found that DAC control with dual-edge modulation doesnpsilat have sub-oscillation problems. As the same as conventional digital control of switching dc-dc converter, there is also one switching cycle time delay between sampling and...
In this paper, a digital and analog hybrid control of multiphase power-modules with low output-voltage and high output-current are presented. The topology of each power module is a current-fed push-pull converter. The front stage is a buck converter which is used to regulate the output voltage and the rear stage is a push-pull converter with the electrical isolation and voltage step-down function...
This paper presents a comprehensive study about the application of three control methods in DC/DC converters. Fuzzy, proportional-integral and fixed frequency sliding mode controllers are applied to DC/DC buck converter. Fixed frequency sliding mode controller is studied with two different design approaches. Advantages, disadvantages, similarities and design procedures of controllers are studied....
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