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In this paper, a reference modification method for the PID control is studied to improve the transient response of the output voltage of the power converter using weighted prediction information with a neural network predictor. Several predictions of the output voltage with the neural network are used to obtain the modified reference value in the PID control by minimizing the objective function. The...
The purpose of this paper is to propose the digital control method that is comprised of the fast P control and model control for an improvement of the transient response of the dc-dc converter. The electronic devices are required the operation in the standby mode and the quick return to the active mode. The fast transient response of the dc-dc converter in such condition is important. In this paper,...
This paper presents a consideration about miniaturization of buck-boost dc-dc converter with the fast P control. From frequency characteristics, it is identified that fast P control method is useful to suppression of output capacitance and circuit miniaturization.
This paper presents the digital overcurrent limitation for the peak current mode dc-dc converter to realize the highly reliable power supply system. The proposed overcurrent limitation circuit is the simple configuration because the existing function in the regulation mode is applied. The proposed method can detect the overcurrent in real time and it is possible to maintain an arbitrary current in...
A single-stage ac-dc converter consisting of full-bridge converter is proposed for EV charger applications. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components...
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 a novel zero-crossing point detection method for boundary current mode PFC converter. In the conventional boundary current mode, the zero-crossing point is detected by observing the inductor voltage. When the digital controller is used in the conventional method, the detection of the zero-crossing point is delayed due to the delay time caused by the processing of DSP. And the detection...
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...
The comparison of the power stage dynamics between a conventional LLC converter and a three-level LLC converter is presented in this paper. The frequency response was similar in continuous current mode, but different in discontinuous current mode. Moreover, how the variation of circuit parameters affects the transfer function of the three-level LLC converter is studied. The experimental verification...
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 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...
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 a comparison of dissipation between LLC and phase shift converters under the same size condition using a manufactured power supply. Moreover, it is clarified that the ratio of the transformer dissipation for the overall dissipation of LLC is much higher than that of the phase shift converter. In addition, we show that the winding resistance decreases by improving the coupling between...
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...
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...
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...
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