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This paper presents a novel zero-voltage-switching approach for predictive boundary conduction mode PFC converter for LED lighting. In the proposed method, instead of being detected by a sensing circuit, the switching off-time for achieving zero-voltage-switching is determined by analytical equations of PFC converter. Therefore, the efficiency reduction caused by sensing circuit can be eliminated...
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...
In this paper, the application of genetic algorithm (GA) to energy management of isolated power system is discussed. A method to realize the simultaneous optimization of configuration and operation with emergency generators (EGs) in a hospital is proposed as an example. The simultaneous optimization of configuration and operation needs search of enormous combinations, which is generally considered...
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 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 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.
The purpose of this paper is a new digital peak current control for the dc-dc converter with a fast proportional (P) control and IIR filter. The proposed control circuit has two features. First, a simple A-D converter for the peak current detection is used. It is consist of an RC integrator and delay circuit. The sampling point of detected current is changed by the feedback value of output voltage...
We have already reported the novel digital control method "static model reference" which is the improved smart digital reference of output voltage for its digitally controlled dc-dc converter. The circuit mechanism and the static characteristics have been cleared. This paper presents dynamic characteristics of the digitally controlled dc-dc converter with static model reference. Moreover,...
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