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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 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 proposes a modulation method for a full-bridge three-level LLC resonant converter. The target converter is known to enable fixed frequency operation, small resonant inductance ratio, and zero-current switching operation of rectifier diodes under wide output-voltage variation. Therefore, it is suitable for an application such as in battery chargers. A new parameter named “master duty,” which...
In this paper, we report the low stability phenomenon of digitally controlled switching mode power supply (SMPS) caused by Equivalent Serial Resistance (ESR) degradation of electrolytic capacitor. The ESR of the output capacitor stack of SMPS is known as the dumping factor in a control loop that enhances SMPS stability. However, while studying electrolytic capacitor degradation in digitally controlled...
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...
The purpose of this paper is to present a new approach of optimum energy scheduling using linear programing for an emergency isolated power generator installed in a large hospital. In our previous work, we have developed a simulator to analyze the power grid conditions when a power failure occurred in medical facilities. Analyzing the power supply and demand balance in medical facilities with our...
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...
Resonant converters have wide application in power conversion facilities based on renewable energy systems. This paper presents a new family of resonant Single Ended Primary Inductor Converter (SEPIC) suitable for high frequency dc-dc power conversion. The proposed circuit features ideal soft-switching and zero-voltage resonant operation at turn-on switching edge to enable high efficiency and low...
The introduction of micro-converter is effective in order to extract maximum energy from solar power. Boost and buck-boost type dc-dc converters generally consist of the micro converter. Downsizing the micro-converter is required because it is installed to each solar cell. The operation in the high frequency is required for downsize the power converter. Soft switching technology is effective in such...
In this paper, a new digital hysteresis current control for ac-dc converters is presented. The new control circuit has the peak and valley current detectors which are comprised of an RC integrator, comparator and R-S flip-flop. These current detectors can detect the peak and valley reactor currents in real time. The proposed control circuit structure and the operation principle are explained with...
The boost type dc-dc converter is used for compensation of dc bus voltage in the dc power feeding system such as the renewable energy system. It should be operated stably to improve reliability of the system. The peak current mode control is applied to operate stably because the boost type dc-dc converter tends to be unstable. However, a peak value of reactor current cannot be captured in the digital...
The renewable energy has been attracted attention as a solution of global warming because it can suppress the carbon dioxide emissions. The renewable energy should be optimized by the energy management in the renewable energy system. The digital peak current mode control dc-dc converter is presented to realize the stable operation in this system considering the variation of the input voltage condition...
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...
This paper proposes an FPGA implementation of a simple and reliable method for real-time peak detection of time series data. Focusing on an existing off-line method called Automatic Multiscale Based Peak Detection (AMPD), we show, how the original AMPD algorithm is modified to be an on-line method and how it is applied on an FPGA. To validate the accuracy of our design, simulation results in a case...
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...
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