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The digital control has the attractive capability, for instance, the high-performance function and the energy management capability. On the other hand, there are issues which must be solved for the actual implementation. The proposed method can solve some of them, namely the transient response, the dynamic characteristics and the precision of the controller, with the simple method.
This paper proposes a current balance control in parallel operation using neural network control in addition to the conventional digital soft-start control for dc-dc converters. The neural network predictor is used in the average current balance control to improve the voltage drop when the current balance operation starts. In the proposed method, the neural network is trained to predict the output...
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...
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...
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 purpose of this paper is to present a digital control method which suppresses the delay-time for the switching power supplies. The operation part of power supply has two controllers as the fast PD and the conventional PID, which are processed in parallel. Therefore, the fast PD control can improve the transient response of switching pulses. Obtained simulation results show that the proposed method...
Since the Great East Japan Earthquake, everyone has come to relook how to use electric energy. In addition, people who say that it should aggressively install safe and clean energy system have increased. To create city which is learned from nature, supported by science and technology, we started activity of community in Fukuoka and Yokohama. This paper introduces overview of smart energy system and...
The purpose of this paper is to present a digital control method which suppresses the delay-time for the switching power supply. Generally, there is the delay-time caused by the A/D conversion time and the calculation time in the digital control. It causes the worsening of the transient response and brings the instability of the system. The proposed method can suppress the delay-time and improve the...
Since the Great East Japan Earthquake, everyone has come to relook how to use electric energy. In addition, people who say that it should aggressively install safe and clean energy system have increased. To create city which is learned from nature, supported by science and technology, we started activity of community in Fukuoka and Yokohama. This paper introduces overview of smart energy system and...
This paper presents a new digital load-dependent soft-start method of dc-dc converter for energy management system. The soft-start operation is used to prevent negative effects for a power supply. In the conventional soft-start operation, the dc-dc converter must start up very slowly to deal with the worst load condition. It takes long time to start up a power supply. The proposed digital control...
The purpose of this paper is to present a novel digital control boundary current mode ac-dc converter. The ac-dc converter is widely used as power factor correction. The ac-dc converter that operates in a boundary current mode has the some advantages. It has capability to achieve low current distortion. The unity power factor is theoretically obtained by the boundary current mode control. In the proposed...
The purpose of this paper is to present a new digital control switching power supply for the HVDC system in data center. The two stage converters are proposed to address the problem of input voltage drop. It consists of the boost converter and the phase-shifted full bridge converter. Since the first stage boost converter make the output voltage constant, good regulation characteristics against the...
This paper presents a novel digital P-I-D control FPGA for a switching power supply in the higher voltage direct-current (HVDC) power feeding system. At first, digital fast P control buck type converter is presented. Then, the appropriate number of sample point is determined. Then the fast P control is applied to the full bridge converter for HVDC. The acceptable delay time, with realizing superior...
This paper presents the performance of novel digital P-I-D control switching power supply with fast proportional control, which is compared with conventional digital control. The transient response is improved, while the transient response of proposed method is improved even with P-I-D parameters that are same to the conventional method. It is confirmed that it has the superior transient response,...
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...
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