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The purpose of this paper is to present a performance characteristics of digital current detector in dc-dc converter. The digital peak current mode control dc-dc converter using the voltage-controlled oscillator (VCO) has already proposed. The peak current is detected by using VCO in the proposed method. The gain of amplifier in the current detector affects to the input voltage range of VCO. Also,...
The purpose of this paper is to present the performance characteristics of the digital PID based two-compensator for the dc-dc converter. Authors have already presented a fast PD control method, which can reduce the influence of the delay time. In this paper, the transient characteristics of output voltage are confirmed in the simulation when the sampling frequency of the PID control is slowed down...
The purpose of this paper is to propose a digitally proportional gain varying method for dc-dc converter. In the proposed method, the proportional gain is set to a small value in the steady state and is changed to a large value over stability limit for only a short time in the transient state. Using the proposed method, the transient response can be improved while the dc-dc converter system is kept...
This paper presents a simple and low cost PV simulator using diode characteristics for development of PV system. In order to reproduce characteristics of PV module, instead of huge digital data of I-V characteristics of PV module considering temperature dependence, a real diode is used in the proposed system. A low cost microcontroller that has a little amount of data memory is used to control the...
This paper presents the parameter design of the integral gain switchover function for the digital control dc-dc converter and its transient response in the DCM. The proposed gain switchover function utilizes the load current to determine the integral gain because the output current is detected in the dc-dc converters for the ICT system. The proposed method uses the hysteresis function around the critical...
The aim of this paper is to give a comparative study on the effect of neural network based reference modification method for a digitally controlled dc-dc converter when circuit parameters and PID control parameters are changed. In general, the parameters of PID control are selected to satisfy both stable regulation of static state and followability of transient state. The selection of parameter values...
This paper describes transient response improvement of digital PID and I-PD controlled synchronous rectification buck-type dc-dc converter using feedforward compensator. Numerical formulae of the feedforward compensator were introduced by taking into account the relational expression including input voltage, output voltage, load current and ON-time of high-side switch. The steady-state characteristics...
This paper presents a random frequency hopping with triangular ramp control for harmonic reductions in a dc-dc converter. The relationship between “the sawtooth and triangular ramp signals” and the inductor current is analyzed, and the two ramp signals are implemented into the converter to compare the variation of output voltage. When the switching frequency hops, using triangular ramp keeps the small...
The purpose of this paper is to discuss a current prediction algorithm for sensorless model control dc-dc converter. In the proposed method, the sensing resistor for the current detection is eliminated by predicting the output current. The output current is predicted from the equation of the relationship between the output and input voltage in the static state using the duty ratio and the output voltage...
The purpose of this paper is to present the digital peak current mode phase-shifted full-bridge zero volt switching dc-dc converter for the data center in the higher voltage direct current (HVDC) system, and show its transient response. The proposed peak current mode control circuit is composed of the RC integrator and comparator only and can detect the peak current in real time. At first, the basic...
The purpose of this paper is to propose a novel digital control method of dc-dc converter where a neural network predictor based reference modification is adopted to improve the transient response in coordination with a conventional PID control. Power supplies for electrical equipment such as computing server, UPS, and so forth, requires a superior control method which can obtain stable operation...
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