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A model control and a filter suppressing oscillation of the output voltage that can obtain the stable output voltage of a dc-dc converter have been proposed previous. Although there is a problem that the condition on the input side of dc-dc converter is changed when it connects the load equipment to renewable energy generators through the DC bus, since the renewable energy generators are sometimes...
This study presents a sensorless static model based with output current estimation method for digital PWM control dc-dc converters. The static model is a feedforward type control method adopted in coordination with the standard PID control and it can improve characteristics of wide input and output range of dc-dc converter by using information of output current. The one of the drawbacks of the static...
One of the important role for dc-dc converters is to regulate output voltage against the transient variation of input voltage. Recently, renewable energy becomes popular and renewable power generators are connected to the dc power grid directly, dc bus voltage is affected from them. Therefore, the improvement of the transient response against the variation of the dc bus voltage is required to control...
This paper considers influence of voltage dividing class E amplifier by parasitic capacitances of diode of connected to drive circuit. Voltage dividing class E amplifier can accommodate problem of class E amplifier because it is possible to divide peak switch voltage by connecting transistors in series. In this circuit, the source of transistor can't be connected to ground by connecting transistors...
This paper discussed the regulation characteristics of boundary conduction mode PFC converter with a novel zero-crossing point detector. In the conventional method, the zero-crossing point is detected by observing the change of inductor voltage. The detection of zero-crossing point is delayed due to the effect of parasitic capacitors in the main components of PFC converter. The proposed detector can...
We have proposed the sensorless model control based on the static model equation of the dc-dc converter that is able to change the bias value corresponding to changes of the load current, the input voltage and output voltage. The sensorless model control can regulate the output voltage. On the other hand, the transient response of output voltage is not improved. Therefore, an improvement of the transient...
This paper studies about computational burden of a reference modified PID with a neural network prediction for dc-dc converters. Flexible control methods are required to realize a superior transient response since the converter has a nonlinear behavior. However, the computational burden becomes a problem to implement the control to computation devices. In this paper, the neural network is adopted...
This paper clarifies the relationship between voltage gain tolerance and resonant circuit components variation for mass production of LLC converters. The LLC converter is a good solution for high power application, hence many PV systems which use LLC converter have been proposed. The combination of the LLC converter and a multi-level conversion technique is also proposed to overcome a drawback of...
In this paper, we present the class E amplifier connecting the transistors in series, and some of connected transistors in series are constantly kept active, and rests are periodically controlled. In the proposed method, peak switch voltage of class E amplifier is reduced lower than conventional because shunt capacitance voltage is divided by connecting the transistors in series. Thus, peak switch...
Switching power converters connected to dc loads need high stability because the dc bus voltage is fluctuated in the hybrid energy system. The aim of this paper is to present stability characteristics of a digital peak current control dc-dc converter regarding input voltage fluctuation. The proposed method shows higher stability than the digital voltage mode control method even though the input voltage...
The switching power supply is required the wide load range operation for the energy saving. In such a situation, the output voltage must be regulated. The model control is able to regulate the output voltage, because the bias value is varied depending on the static model equation. Thus, it is effective for switching power supply to implement the model control. The existing sensorless model cannot...
The purpose of this paper is to analyze the dynamic characteristics of proposed digital peak current mode dc-dc converter. The waveforms of the output voltage and the reactor current are derived by the small signal analysis. They are compared with simulation results assuming an actual large amplitude operation. It is confirmed that the tendency of the transient response is indicated based on the analysis...
The aim of this paper is to present a superior transient response of a digital peak current mode dc-dc converter in order to address input voltage fluctuation. In the dc power feeding system, a quick response is important for not only load fluctuation but also input voltage fluctuation. Since the proposed peak current mode control method can detect the peak current in real time, the transient response...
The dc power feeding system has been attracted attention in recent years. Since the load is dynamically changed in this system, the stability of dc-dc converter is important. This paper presents the stability analysis and the transient response of digital integral gain changeable control dc-dc converter using small output capacitance. The proposed method changes the integral gain with a single logarithm...
In the switching converter control, a digital feedback control is widely used to regulate the output voltage of power supply. However, its feedback gain selection becomes more sensitive and difficult since the switching frequency tends to be faster in recent converters to satisfy the requirements of miniaturization and power efficiency. Therefore, a novel control method is needed to improve the transient...
This paper proposes a novel digital soft-start control method of dc-dc converter for a higher voltage direct current (HVDC) oriented data center application. The soft-start operation is used to suppress the inrush current and the overshoot of output voltage in the startup of a power supply. The proposed digital control method switches two functions which are used to control the speed of the soft-start...
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...
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...
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 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...
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