introduction: human embryonic stem cells (hescs) are pluripotent cells that can proliferate and differentiate to many cell types. their electrophysiological properties have not yet been chracterzed. in this study, the passive properties (such as resting membrane potential, input resistance and capacitance) and the contribution of delayed rectifier k+ channel currents to the membrane conductance...

In this paper the voltage and current stress of a delta-connection of three single-phase boost-type unity power factor rectifier modules ( -Rectifier) is analyzed in order to perform a design comparable to a direct threephase three-level six-switch unity power factor (conventional) rectifier system. The conduction losses of the power semiconductors are calculated using analytical approximations...

1PG scholar, Dept of Electrical Engineering, A.U. College of Engineering (A), Andhra Pradesh, India. 2 Professor, Dept of Electrical Engineering, A.U. College of Engineering (A), Andhra Pradesh, India. ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract A dual bridge rectifier topology consisting of...

Three three-phase, single-switch, high-powerfactor rectifier implementations were evaluated on a comparative basis. Specifically, the discontinuousconduction-mode boost rectifier with a 5-harmonic-trap filter, the discontinuous-conduction-mode boost rectifier with a harmonic-injection circuit, and the multi-resonant, zero-current-switching buck rectifier were compared with respect to their effi...

In this paper three single-phase, high-power-factor rectifier implementations were evaluated on a comparative basis. Specifically, a zero-voltage-switching continuousconduction-mode boost rectifier, a zero-current-zero-voltageswitching continuous-conduction-mode boost rectifier, and an interleaved variable-frequency discontinuous-conduction-mode boost rectifier were compared with respect to the...

A technique which improves the performance of the boost converter by reducing the reverse-recovery-related losses in the boost switch and rectifier with an active snubber that is implemented with a minimum number of components is presented. This minimum-component-count snubber consists of a snubber inductor, an auxiliary switch, and a rectifier. The proposed technique reduces the reverse-recove...

A new current mode precision rectifier is presented. This circuit provides precision rectification for wide range of input signal with low temperature sensitivity. It can work as full wave rectifier as well as half wave rectifier with controllability on action. It can amplify rectified current signal by a bias voltage. Direction of the output current signal can also be controlled by changing th...

The three-phase three-level ∆-Rectifier is formed by a delta-connection of single-phase three-level PWM rectifier modules and does provide the full rated output power also in case of a mains phase loss. Furthermore, the system shows a low harmonic content of the mains phase currents if the modulation is with respect to the formation of a maximum zero-sequence component of the module input curre...

A new type of single-phase stand-alone induction generator using a three-phase induction machine and a single-phase voltage-source PWM inverter is introduced. The generator scheme is capable of producing constant load frequency with a very well regulated output voltage. A small lead acid battery and a single-phase full diode-bridge rectifier are used to feed the inverter. The inverter feeds one...

Fig. 1 Input rectifier bridges circuit diagrams Fig. 2 Reverse recovery waveforms comparing standard rectifier (a) to semifast rectifier (b) Switching power semiconductors are used in inverter systems with a DC-link. Due to high switching frequencies, harmonics and line distortions may be generated. It is important that new designs reduce these disturbances and fulfill the EMI filtering require...