Common mode voltage (CMV) causes various issues, including a negative impact on the performance of hybrid electric vehicle’s power system (HEV). Many papers have published methods that mitigate CMV, almost all which attempt to avoid zero vectors, but this increases total harmonic distortion (THD). This work describes simple and efficient method for reducing CMV in two-level three-phase source i...

A guard trace placed near a signal line reduces commonmode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace r...

The use of differential voltage measurements is widely used in EIT instruments. Instrumentation amplifiers are always affected by common mode voltages at their input. These voltages may have different origins, being the current sources and multiplexers the ones which contribute the most. However, even considering ideal current sources and multiplexers, some amount of common mode voltage will al...

Class AB differential amplifiers using composite BiCMOS and bipolar transistors are introduced. Their utilization for the implementation of low voltage (+-1.65V) operational amplifiers with high slew rate and rail to rail common mode input voltage range is discussed.

The dynamic voltage restorer (DVR) provides a technically advanced and economical solution to voltage-sag problem. As the voltage-restoration process involves real-power injection into the distribution system, the capability of a particular DVR topology, especially for compensating long-duration voltage sags, depends on the energy storage capacity of the DVR. The interline DVR (IDVR) proposed i...

This paper explains a mechanism of commonmode generation on a printed circuit board with a narrow ground pattern. A transmission line has its value of degree of unbalance. At a connection point of two transmission lines having different degrees of unbalance, common mode voltage is generated proportional to the difference, and it drives common mode current. The authors propose a method to evalua...

This paper presents an active solution to a commonmode voltage created by typical three-phase inverters. It is shown that the addition of a fourth leg to the bridge of a threephase inverter eliminates the common-mode voltage to ground created by the modulation of the inverter. An appropriate fourphase LC filter is inserted between the inverter and the load in order to create sinusoidal output l...