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Among various converters, the LLC electric current resonant converter attracts attention because of high power density, low noise and high efficiency. However, this converter cannot apply the analysis of averaging method, and impossible to derivate the transfer function, so designing is difficult. In this study, we devised a method to derive a frequency response characteristic with a transfer function...
In this paper a 600MHz 4th order low-pass analog filter in CMOS-28nm is presented. The transfer function is obtained with the cascade of two Active-RC Rauch biquadratic cells. Each cell is based on a novel OPAMP optimized for very high frequency operation achieving a Unity Gain Bandwidth (UGBW) > 7GHz. The developed three stage folded OPAMP exploits a feed-forward compensation technique to maximize...
Regarding the great advantages of impedance source converter topologies, research trends based on conventional Z-source inverter (ZSI) are much more interesting. However, it is very complicated because such a model is forth-order system. The higher order model remains a large obstacle for switching power converter design of various applications. This paper investigates the feasibility of reduced order...
Coupled-inductor boost converters are under development for high-current, high-power applications ranging from automotive fuel cells to photovoltaics. This paper presents the small-signal analysis of a coupled-inductor boost converter operating in both CCM and DCM. Due to the complexity of operation of a coupled-inductor boost converter operating in DCM, several small-signal models must be derived...
This paper proposes a realization of fully tunable all-pass (AP) filter and its application. Three Multiple Outputs Operational Transconductance Amplifiers (MOOTAs) and a grounded capacitor are used for realizing an all-pass filter which is able to tune in both of the frequency response and gain. The frequency response and gain are independently tuned through particular bias current. The advantage...
The use of a digital architecture in PWM controllers for point-of-load (POL) applications, together with system identification techniques, allows the development of fully automated routines for in-situ system performance optimization where controller parameters are specifically tailored to the application. In this context, this paper proposes a method for performing parametric system identification...
In present days, all the fundamental concepts and techniques of signal processing and control theory is being extended towards fractional order systems. In this paper, we considered a family of fractional order low pass filters. Using the concepts of fractional order calculus, they are approximated uptoa satisfactory level. We then took these approximated transfer functions and realised them using...
A new frequency compensation scheme using a second generation differential current conveyor (DCCII) for three-stage amplifiers is proposed. By adding a DCCII as a feedback path from output of the second and the third stage to the output of the first stage, feed-forward path and the right-half plane zero will be removed subsequently which improves phase margin and the gain-bandwidth product. Calculations...
The motivation of this paper is to show systematic procedure how to design electronically reconfigurable first-order filtering section without change in network topology. It is verified that for different active elements matrix nodal methods can be directly used without any changes in the calculation algorithm. As a consequence this task does not represent problem and can be marked as educational...
This paper brings some practical examples how to create and utilize fractional-order two-terminal devices in analog filtering applications. Starting with desired decimal order of designed fractional-order element its passive circuit approximant is introduced and values of network components are calculated by using analytical formulas as well as Orcad Pspice optimizer. Then final device becomes a part...
In this paper, the performance of a cascaded multilevel H-bridge converter for a series voltage compensation system under multiple loop control strategy (MLCS) is investigated. The control method employs the voltage and current of the capacitor of the output LC filter of the converter as the feedback signals to generate the reference signal for the converter. The contribution of each voltage source...
This paper presents a SC biquad using a simple quasi-unity gain amplifier. In sub-nanometer CMOS technologies the intrinsic gain of the transistors is low, this increases the difficulty of designing high gain amplifiers. The proposed SC filter is based on the Sallen-Key biquad and it requires only a simple low gain amplifier. A differential filter circuit, including a suitable low gain amplifier based...
In this paper, a method for approximating a first-order implicit fractional transfer function, that corresponds to a frequency-bounded fractional differentiator or integrator, is presented. The proposed method is based on the well-known Newton's method for iterative root approximation. First-order implicit fractional transfer functions have several applications in modeling and control. This type of...
The aim of this paper is to describe a method of filter bank realization using the switched capacitor (SC) technique. The analysis of steps needed for this realization is performed. The correct solution requires the IIR filter bank synthesis followed by the conversion to SC circuits. Due to simplicity only the two-channel filter bank is used. The main points of the whole design procedure and key recommendations...
Considering that the lifespan of electrolytic capacitors in power supply don't match that of LED, we propose a Buck converter which uses active ripple compensation circuit to replace the traditional electrolytic capacitor filter. When the converter works on long duty ratio, the power loss in compensation circuit is small and ripple current and voltage are low. The operation principle of this new topology...
Some capacitor types, such as tantalum capacitors, cannot be well modeled by means of the commonly used R-L-C network, so other equivalent circuits are required when an accurate model is needed. This paper proposes a simple and systematic modeling procedure of capacitors. A canonical passive network (minimum number of elements) is synthesized from the frequency response of the capacitor. The validation...
The fixed on-time with bottom detection control having ripple injection has become very attractive due to practical usage and realization of ceramic capacitor solution for output while keeping ultra fast transient response. This paper presents quantitative analysis by introducing averaging method in comparator operation for the transfer function. As a result, the frequency response characteristic...
Two-stage, grid-tied Photovoltaic (PV) systems commonly use boost-type converters at the front end. The charge-pumped reboost converter is a high-step-up dc-dc converter with continuous input-current which is suitable for this purpose. Using a tapped-inductor boost topology for the small-signal model, a high-bandwidth input-voltage loop can be designed which rapidly tracks reference changes, source...
This paper to design a novel technique for notch filter by using multilayer uniformly distributed RC line (MURC) with three capacitive layers is presented. The proposed circuit configuration consists of one notch characteristics circuit using MURC, one capacitor (C0) and a single gain amplifier. alpha1, alpha2, beta and K parameters of the circuits are used to improve the magnitude response with notch...
In order to connect an LCL filter in a three phase system, two methods are possible. The first one is a wye connection and the second one is a delta connection. To study the stability problems, a mathematical model should be known, but the model of a delta connected LCL filter is not formulated. In this paper, a model with transfer functions is proposed for that purpose. Furthermore, this paper describes...
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