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This paper reveals how the conducted common mode noise of a boost converter can be reduced by the use of leakage inductance of coupled inductor. Specifically, it shows how the common mode impedance due to the leakage inductance of a coupled inductor can be used to reduce common mode current, and this point is experimentally verified using two kinds of inductors: a gapped core inductor with a higher...
Recentry, interference of artificial noises from electrical power transfer becomes large and deterioration of sound quality of AM radio is worried. The authors proposed a noise suppression system for AM radio using quadrature demodulation and PI algorithm. It is expected that the noise suppression effect is reduced when the system has a synchronization error. In this paper, an effect of synchronization...
In this paper, we propose a circuit model that can predict the common-mode noise current in the AM radio band that will flow to an evaluation circuit consisting of a DC motor, a motor control unit, and a battery. In this model, the common-mode impedance of each unit and the impedance of the cables are expressed by lumped constant circuits. It is found that the common-mode current that flows in the...
A highly accurate filter simulation requires a high precision SPICE model for the common mode choke. Conventional SPICE models for chokes consist of parallel RLC circuits and show a substantial difference between the measured and simulated impedance characteristics due to the lack of frequency-dependent complex permeability considerations. Here, we propose a novel SPICE model for a common mode choke...
In recent years, interference of artificial noises from electrical power transfer becomes large and deterioration of sound quality of AM radio is worried. In this paper, a noise suppression system using quadrature demodulation techniques is proposed to reduce the effect of the interference. The proposed system utilizes the fact that the in-phase signal from the demodulator includes both of AM signal...
Recently, hybrid vehicles (HVs) have become widespread. In the current HVs, a high-voltage (200 V) battery supplies power to the Power Control Unit (PCU) for driving a motor, generator and air conditioner compressor. It is expected that such kinds of power electronic devices will increase in number in the future. We previously proposed a power line communication (PLC) that uses a high-voltage power...
The artificially generated noise from the appliances has a periodicity in frequency domain. A noise suppression system, which is based on the PI(Power Inversion) algorithm and using frequency shift, has already been proposed. However, the system has a significant problem that the suppression effect can not be obtained when the frequency shift is not accurate. In this paper, reduction method of frequency...
Based on experimental time-series data, a new electromagnetic clutch structure is verified to be useful for surge voltage suppression, providing a reduction in the surge voltage of approximately 50%, in its trial production. The new structure has a metal layer with low resistivity surrounding the clutch coil, which is located between the clutch coil and the coil housing. First, we optimized the structure...
In recent years, electronics and large appliances became popular. However, a noise from the appliances would interfere with radio communication system. The artificially generated noise from the appliances has a periodicity in frequency. In this paper, a periodical noise suppression system using a frequency shift is proposed. Suppression effect for the periodical noise by the proposed system is confirmed...
Recently, as hybrid vehicles (HVs) and electric vehicles (EVs) have become widespread, a large number of electronic devices have been incorporated into the vehicles. Thus, there is concern regarding the increasing number of lines and connectors. In HVs and EVs, a high-voltage (200 V) battery is employed. We have studied power line communication (PLC) that uses a high-voltage power line to address...
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