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This paper presents a regulation characteristics of proposed fast response digitally peak current controlled dc-dc converter. In the proposed method, the peak current can be detected in real time by using an inexpensive voltage controlled oscillator (VCO) and a programmable delay circuit. In a simulation and an analysis results, it is revealed that a proposed circuit has a sufficient resolution to...
This paper presents a new digital soft-start circuit for the parallel current mode dc-dc converter. It is required to operate in soft-start and in parallel for the energy saving. Since the optimal parameters for the soft-start change depending on the load condition, it is important to detect the load condition. In the conventional analog control circuit, the fixed large parameter of the soft-start...
In this paper, we study a neural network based digital control method for dc-dc converters. In particular, we consider the time duration effect of the neural network control term on the improvement of the transient response of dc-dc converter. To obtain a fast response in the transient state, we focus on the utilization of the neural network predictor in addition to the conventional PID control. In...
The purpose of this paper is to present a novel digital peak current mode dc-dc converter and its control characteristics. The proposed method can detect the peak current in real time. The proposed peak current detection circuit is composed of RC integrator and comparator as the A-D converter. The design of RC integrator has a large effect on regulation characteristics and the transient response of...
Early and certain fire detection is one of the important issues to keep infrastructures safe. Especially, it becomes an urgent problem for open places such as port facilities, large factories, and power plants, due to its large harmful effect to the surrounding areas. In these places, direct detection of fire or flame has some difficulties because they are open and hence have problem to set sensor...
This study presents a novel adaptive control based on a neural network for dc -- dc converters. The control method is required to adapt to changes of conditions to obtain high performance dc -- dc converters. In this study, the neural network control is adopted to improve the transient response of dc -- dc converters. It woks in coordination with a conventional PID control to realize a high adaptive...
The purpose of this paper is to show performance characteristics of the reference modification control dc-dc converter which uses neural network and model controls. In the presented method, the neural network controller is used to modify the reference in the proportional control term of the conventional PID control. The neural network controller is repeatedly trained using former predicted data to...
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...
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 performance characteristics of a quick response digital peak-current-mode 380V dc-dc converter for the green IT system. A proto-type is constructed as the digital control dc-dc converter used in the higher voltage direct current (HVDC) system for the green IT. The proto-type uses the digital peak-current-mode control to show a superior transient response. A...
The purpose of this paper is to present a transient response of proposed quick response peak current control dc-dc converter. In the proposed method, the peak current is able to be detected in real time by using voltage controlled oscillator (VCO) which is very low cost and a high speed A-D converter. The proposed circuit generates the turn off signal of the main switch. In simulated results, the...
In the previous research, the fast P control method is proposed. In this method, the PID control part is divided into the P control and I-D control parts. The high speed-low resolution A-D converter and low speed-high resolution A-D converter are required for the P control and I-D control, respectively. These two A-D converters are lower cost than the high-speed and high-resolution A-D converter....
This paper presents a new soft-start method for the current mode digital control dc-dc converter. For the soft-start operation, it is important to detect the load current. In the analog control method, the fixed parameter of the soft-start circuit must be set. In the proposed digital control in the current mode control, the load resistor can be calculated with the output voltage and output current...
It is with great pleasure that we welcome you to the 1stInternational Conference on Renewable Energy Research and Applications (ICRERA) 2012 in Nagasaki, Japan.
This paper presents a new fast response digitally controlled full bridge converter which combines the fast proportional-differential control with the FIR filter. In the proposed method, the sample timing for proportional-differential control is contrived. Thus, the delay time for proportional-differential control is minimized. The FIR filter is used in order to minimize the steady-state-errors. It...
The purpose of this paper is to present a novel reference modification dc-dc converter using the reactor current sensing method and to compared its transient characteristics with the conventional output current sensing method. The proposed method uses the reactor current sensing method with the R-C filter in order to exclude the sensing resistor for the output current sensing method. Moreover, transient...
The purpose of this paper is to present a new neural network based method for digitally controlled dc-dc converters. In the presented method, the neural network predictor is used to modify the reference value of the output voltage in the PID control to improve the transient response. This neural network control operates in coordination with the PID control. At the first, the neural network is repeatedly...
The purpose of this paper is to present performance characteristics of a quick response average current mode dc-dc converter using a digital filter. The proposed control circuit performs the digital FIR filter using the moving average to control the output voltage. It also uses a voltage controlled oscillator (VCO) to realize a quick response. The VCO can detect the reactor current in real time. This...
This paper presents adaptive soft-start characteristics of digital control dc-dc converter. For the soft-start operation, it is important to detect the load resistor. In conventional analog method, the fixed large parameter of the soft-start circuit must be set by the condition. In the proposed digital control, the load resistor can be calculated with the output voltage and output current, and the...
This paper presents a new reference model digital control dc-dc converter and its transient characteristics. A reference value is modified to suppress the transient response against the change of output voltage by the reference model control. The modifying of reference value operates only when the output voltage becomes larger than a plus-minus 1% from the steady state value. Using the proposed method,...
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