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This paper analyzes the conducted noise generation mechanism of totem-pole bridgeless PFC converter in consideration of frame ground capacitor and LISN at every input voltage zero-crossing. The spike current occurs at zero-crossing and causes severe common mode noise. The frequency range on noise spectrum caused by zero-crossing issue is discussed by mathematical calculation. Furthermore, the experimental...
This paper proposes a new design method to minimize the cause of parasitic oscillation in zero-current-switching (ZCS) DC-DC converter. The parasitic capacitance in switche is considered in circuit operation, a design of the ZCS DC-DC converter is optimized by proposed design method. With some prerequisites and assumptions, the waveform equations of the parasitic oscillations are analytically derived...
Since the loss of input rectifying diode bridge in the conventional PFC circuit reduces the efficiency, the bridgeless PFC circuit has been proposed. However, the performances of EMC in some bridgeless PFC circuits are unsatisfactory. In order to improve noise performance, the noise mechanism should be investigated as the first step. In this study, common mode noise current of conventional bridge...
The stability analysis of the adaptive variable step size MPPT algorithms is extremely depending on the value of the scaling factor (N), which typically adjusts the input signal to a proper magnitude prior to determine the proceeding step size. This paper proposes a new small signal analysis of the variable step size incremental resistance INR MPPT algorithm used in photovoltaic PV battery charging...
In the fields of using green energy such as EV power system and the PV system, the bi-directional DC-DC converter, which is used to control the charge and discharge of batteries, is now attracting more and more attention. In the bi-directional DC-DC converter for the battery charger, the response characteristics and stability of one are key points for the performance of the whole system. However,...
The Power Supply Working Group, created inside the Cooperative Study Group on “Applied Simulations of Power Electronics Systems” of IEEJ, is developing practical simulation examples of power supply circuits. The simulation examples have the following key features: (1) Parameters in the simulation examples are thoughtfully set to practical values so that one can readily carry out practical simulations...
Conventional maximum power point tracker (MPPT) uses fixed step size perturbation in order to track the maximum power point (MPP), therefore the tracking efficiency has decreased due to steady state oscillations around the MPP. Recently, many techniques have been developed proposing new approaches in the field of variable step size MPPT to overcome the shortcoming of the fixed step size techniques...
In DC power supply system, a fast response circuit breaker is required. Semiconductor DC circuit breaker is an important key technology in DC power supply system. This paper considers the malfunction issue of Silicon Carbide-Static Induction Transistor (SiC-SIT) based DC circuit breaker in DC power supply system. The malfunction mechanism is explained, and a solution methodology proposed. Investigations...
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