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A new ripple controlled synchronous Buck converter featuring with improved transient response and low output voltage ripple is presented in this paper. The proposed modified ripple-based control (MRBC) technique adopting a novel ripple generate mechanism realizes the fast response ability by regulating the inductor current and output voltage through separate loops rapidly. In addition, a high-precision...
The purpose of this paper is to proposed digital controlled integral gain switchover method dc-dc converter. The integral coefficient changes for the continuous current mode(CCM) and discontinuous current mode(DCM). The integral coefficient is changed by the reactor current detection. The integral coefficient changes in the CCM using the average value of reactor current. It is confirmed that the regulation...
A digital hybrid ramp compensation method with output capacitor current ramp estimator and external ramp for digital V2 control is proposed to solve the stability issues in low-ESR output capacitor application of buck converters. Since capacitor current is in derivative relation with output voltage, the proposed method has faster transient response and simpler structure than digital inductor current...
A modified control scheme is presented in this paper to improve the load transient response of DC-DC power converter by utilizing a previously proposed auxiliary circuit which is capable of operating in both boost mode to discharge the output capacitor during load step down transient, and in buck mode to charge the output capacitor during load step up transient. The proposed modified control scheme...
This paper presents a redundant operation of a modular three-phase AC/DC converter based on a distributed control method. For the flexibility and redundant operation purpose, each converter module employs an individual controller to control the power converter operation. The mathematical model to design the output voltage control is described in this paper. The performance evaluation was conducted...
This paper introduces a digital controlled fast average current mode dc-dc converter using a voltage controlled oscillator (VCO) and a FIR filter. The VCO is used to detect the current in real time. The minimum phase FIR filter is preformed to control the output voltage. The proposed method shows a superior transient response. As a result, the convergence time of output voltage is improved to 97%...
The purpose of this paper is to present a novel digital variable integral gain control for dc-dc converter. The integral coefficient KI changes for the continuous current mode and discontinuous current mode. The integral coefficient KI is changed by the reactor current detection. The integral coefficient KI changes in the discontinuous current mode using the average value of reactor current. Then...
This paper presents a novel prediction based digital control dc-dc converter. In this method, a neural network control is adopted to improve the transient response in coordination with a conventional P-I-D control. The prediction based control term is consists of predicted data which are obtained from repetitive training of the neural network. This works to improve the transient response very effectively...
This paper introduces a novel fast average current mode digital control for dc-dc converter. The proposed control circuit has two features. First, the voltage controlled oscillator (VCO) is used for the switch/reactor current detection. The VCO is low price and can transform to digital value quickly without complex calculation when the current is detected. Second, the digital feedback value of output...
A switching regulator with quasi-V2 adaptive on-time (AOT) control, that provides a fast load transient response is proposed. A feed-forward path network allows the proposed switching regulator to achieve a fast transient response and stable operation without requiring an output capacitor with a large equivalent series resistance. The proposed AOT controller makes the switching frequency pseudo fixed...
Main content of this paper is a new auto-bias method for digital control dc-dc converter. In the proposed method, not only the P-I-D control as the feedback one but also the new auto-bias method as the feedforward one is used. The new auto-bias method consists of two superior functions. One is the steady-state function for the expanse of regulation range of output voltage, and another is exponential...
A fully integrated wide-band PID controller is implemented for a buck DC-DC converter operating in voltage mode. To implement efficiently areal on-chip PID controller, a novel compensator is proposed utilizing AC ripple current of the inductor. The integral controller with an error amplifier and the proportional controller do not require any additional capacitors. The bandwidth of overall loop is...
The proposed current-mode synthetic control (CSC) technique in the design of boost converters can improve the transient response time and maintain high conversion efficiency over a wide load range. The CSC technique has high accuracy similar to the current-mode control and doesn't need the slope compensation for simplicity. Besides, the transient response is also improved due to the current-mode hysteresis...
An integrated fixed frequency adaptive-on-time DC-DC converter with fast transient response is presented. To achieve fixed frequency, the slope information of the inductor current is employed to adjust the on-time and keep the switching frequency constant at 1MHz to within 10% variation across the whole input/output and loading ranges. An integrated boost converter with an input voltage of 1.8V to...
This paper presents the design of current mode PI controller for single-phase PWM inverter. The controller is comprised of inductor current as the inner loop and output voltage as the outer feedback loop. The control design is carried out using Sisotool, which is provided in Matlab. By using this tool, users can examine the effects of changing the gain control values to system's transient response...
This paper offers a comprehensive optimization approach for voltage regulator modules (VRMs). Minimal material cost is achieved while specifications for transient response, steady-state operation, and efficiency are treated as constraints with equal priority. The power stage and the controller are designed as a whole system by combining time-domain and frequency-domain models. Practical solutions...
This paper presents design, modeling and simulation of a low-power digitally controlled synchronous rectifier (SR) buck converter. Due importance is given in the model to the effect of non-linear parameters in low voltage converters, such as equivalent series resistance ESL of the inductor, ESR of capacitor and RDS(on) of MOSFET switches. A digital PID controller is design adopting direct digital...
Two DC-DC converters for bipolar outputs is implemented which are suitable for large-size AM-OLED (Active-Matrix Organic Light Emitting Diode) display. The positive output voltage is regulated by a buck DC-DC converter, and the negative one is regulated by a inverting buck-boost DC-DC converter. Both DC-DC converters operate in a current mode in order to enhance the transient responses. The improved...
This paper discusses the performance benefits and energy efficiency improvements from microprocessors that communicate with their power supply. The power supply's response to computing load changes can be vastly improved with information about expected transients. Supply voltages can be modified to decrease steady-state power losses. A microprocessor can also adjust its computational activity based...
This paper proposed a solid-duty-control technique in the boost converter to keep a constant duty control to reduce dip voltage during load transient period. Besides, due to variable transient enhancement controller, fast transient response is achieved. The proposed SDC technique can provide a stable and regulated output for edge-lit LED backlight systems. Compared to conventional design without any...
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