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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,...
This paper presents a current sensor-less hysteretic current mode switching power supply. Switching power supplies are controlled in the voltage mode or the current mode. The current mode converters are used in the power system which requires of high reliability because it has high stability of the feedback loop compared with the voltage mode converter. The current mode converter is necessary to detect...
The purpose of this paper is to reveal possibility that suppression of output capacitance on dc-dc converter by applying fast P control method. Furthermore, in HVDC system, a consideration whether this control method is effective for miniaturization of output capacitor is presented. A prototype uses 800 W full-bridge dc-dc converter.
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...
The purpose of this paper is to present the digital overcurrent detector for the peak current mode dc-dc converter which has been already applied to the server for the data center. The proposed peak current detection circuit is composed of the RC integrator and comparator as the A-D converter for the detected current. The proposed method can detect the overcurrent by using the RC integration time...
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...
This paper presents the electric vehicle(EV) system using module balancing method in vehicle-to-grid(V2G) system. Since there are intrinsic discrepancies among batteries, the state of charge(SOC) of each battery after charging or discharging may not be the same. Consequently, the batteries are with different voltages during the charging and discharging process. As a result, over-charging or over-discharging...
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 propose a high efficiency DC-DC converter and simple control method for the multi energy source management. The proposed DC-DC converter consists of the two high efficiency DC-DC converters such as the switched capacitor DC-DC converter and Current resonant type isolated DC-DC converter. In addition, this paper describes the novel control method for the multi energy source management. The...
Three phase PFC rectifier followed by a DC-DC isolated converter has been the industry workhorse for conversion of three phase AC to isolated DC output used for high power (> 3kW) telecom loads. In this paper a reduced device count nine-switch converter topology which integrates the two stages of a conventional three phase AC-DC power supply with an isolated DC output voltage for telecom applications...
This paper introduces a highly-efficient two-stage DC-DC converter with wide input voltage. Based on the digital control technology, it uses two-stage DC-DC conversion. This paper describes the circuit topology, working principle and control method of the convert in detail. The converter consists of the former input circuit, intermediate conversion circuit, output rectifying circuit and feedback control...
In this paper, a novel digital soft-start control method which employs a reference modification with a neural network predictor is presented to improve the transient characteristics in parallel operated dc-dc converters. To reduce the power consumption in parallel operated dc-dc converters, the mode of them is changed frequently from stand-by mode to operating mode, or vice versa. In the transient...
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...
In this paper a resonant voltage doubler circuit is reported on, which enables high efficiency and low power consumption of a solar cell DC-DC converter (PV converter) for solar cell input. We have also developed a PV converter that uses a resonant voltage doubler circuit and achieved high conversion efficiency of 97.6% at an output power of 10kW.
This paper proposes droop control for Multi-Level Virtual Conductor (MLVC). This control method aims at overcoming the problem that circulating current flows when MLVC constitutes a mesh connection. Generally, the voltage difference between the terminals of any conductor is zero volts. However, MLVC can keep the voltage difference between the converter terminals constant at a certain value. In this...
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...
In this paper, a nanosecond level response digital pulse width modulation (PFM) control circuit for the current resonant converter such as LLC has been proposed. The proposed circuit is composed of a unique analog to digital converter and logic based digital controller. With the experimental results, it was confirmed that the switching frequency can be varied from 0.8 to 1.2MHz in regard to 20% variation...
This paper proposes a method to improve the power efficiency in the half-bridge LLC resonant DC-DC converter. The optimum design of a transformer is discussed to improve power efficiency. The interlinkage magnetic flux in the primary and secondary wires causes eddy currents, which results in a power loss. This study demonstrates that power loss can be reduced through optimum design of the strand diameter...
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