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In this paper, the already proposed high feedback gain switching method has the optimum setting for a specific load step. Therefore, we investigate the optimal setting of the proportional gain switching for various disturbance such as the line and load fluctuation, which could occur in the renewable energy system. As a result, the following setting of the proposed method is optimum: the optimum setting...
The purpose of this paper is to improve dynamic characteristics of dc-dc converters in the information and telecommunications system by using a proportional and integral gain changeable control method. Generally, stability becomes worse and a limit cycle oscillation occurs when large PID control gains are used. In the proposed method, the proportional gain is risen during a transient state to improve...
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...
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.
The purpose of this paper is to present the wide feedback gain changeable control dc-dc converter to improve the transient response. In general, the control gain is set to a value as large as possible considering the stability of the system when a quick response is required. A quantization error has the resolution of the digital controller coarse in such a case. Also, the oscillation based on the...
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...
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...
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...
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...
In this paper, we present a feedback gain changing dc-dc converter. The proposed method corresponds to the input voltage variation because the integral gain is determined in consideration of it. Generally, a quick transient response cannot be obtained when the proportional gain is small. On the other hand, when the proportional gain is set to a large value, the transient response is improved. However,...
Recently, the energy saving is required. It is necessary for the energy saving to operate the electric device in the sleep mode. Therefore, the output voltage rises abnormally because the dc-dc converter is required the operation in the discontinuous current mode. Therefore, we have proposed the model control using static model and strived for improvements. In the proposed method, the output voltage...
The purpose of this paper is to reveal the designing of the static characteristic of the digital peak current mode dc-dc converter using a voltage controlled oscillator (VCO). In the proposed method, it is able to sample the reactor current by using the VCO and the delay circuit. The improvement of the dynamic characteristic and the analysis of the proposed method have already been revealed. However...
In this paper, we present a new quick response digital control dc-dc converter based on a dynamic unstable gain to improve transient response. In the proposed method, the proportional gain is set to the small value in the steady state and the large value over the stability limit for only a short time in the transient state. Compared with the conventional PID, the undershoot, the overshoot and convergence...
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.
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