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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 proposed paper aims at characterizing the effect of thermal aging of a buck DC-DC converter on its electromagnetic emission and identifying the role of the different constituting components. An equivalent model is built to confirm the emission level increase induced by high temperature stress.
We derived expressions of power and ground voltage noises for reducing common-mode voltage in a power distribution network of an LSI and found that they have the same amplitude and a phase difference approaching 180°. To confirm this, we performed an experiment using a test board with a cover-metal structure-essentially, a floating conductor in an LSI package to reduce common-mode voltage. The evaluation...
Power supply noise generated by integrated circuits is one of the major sources of EM radiation from PCBs. The reduction of power supply noise can be realized by means of devices that bypass the current among power supply planes, such as bypass capacitors, ground vias and so on. In the present work the effect of current bypass devices on the far field radiation from multilayer PCBs is represented...
Resonances in power distribution network are the major cause of voltage fluctuation and noise problems. In this paper, a new method that suppresses impedance peak is proposed. The proposed method uses a high series resistance (HSR) capacitor in parallel to regular bypass capacitors. By selecting the parameters so that the series resonance frequency of the HSR capacitor equals to the anti-resonance...
In recent times, more than 60 percent of the world's energy is used to drive electric motors. Because of the growing requirements of speed control, pulse width modulated (PWM) inverters are widely used in adjustable speed drives. Noise generated by PWM inverter fed AC motor drive systems causes severe parasitic current problems, especially at the cases of high frequency. This paper proposes two new...
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