Design and analysis of output filter for 3-phase UPS inverter

This paper presents new architectures and implementations of original open-loop Class-BD audio amplifiers with balanced Common-Mode output. The output stage of each proposed amplifier includes the typical H-bridge with four MOSFETs and four additional MOSFET switches that balance and keep the Common-Mode output constant. The presented amplifiers employ the extended NBDD PWM or PSC PWM modulation scheme. When the output stage is built only on NMOSFET transistors, gate drivers require a floating power supply, using a self-boost charge pump with capacitive isolation of the control signal. The use of complementary MOSFETs in the output stage greatly simplifies gate control systems. The proposed amplifiers were compared to the typical Class-BD configuration, using the optimal NBDD modulation with respect to audio performance of the Differential-Mode (DM) and Common-Mode (CM) outputs. Basic SPICE simulations and experimental studies have shown that the proposed Class-BD amplifiers have similar audio performance to the prototype with the optimal NBDD modulation scheme, while at the same time having a balanced constant voltage CM output, thus eliminating the main contributor to radiation emission. As a result, the filtering of the DM output signals can be greatly simplified, while the filtering of the CM output signals can be theoretically eliminated. Practically, due to the timing errors added by the gate drivers, spikes are generated at the CM output, which are very easy to filter out by the reduced LC output filter, even at very low L.

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Sensorless control of induction motor drives equipped with inverter output filter

IEEE International Conference on Electric Machines and Drives, 2005. ◽

10.1109/iemdc.2005.195743 ◽

2005 ◽

Cited By ~ 8

Author(s):

J. Salomaki ◽

M. Hinkkanen ◽

J. Luomi

Keyword(s):

Induction Motor ◽

Sensorless Control ◽

Motor Drives ◽

Induction Motor Drives ◽

Output Filter

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Voltage-Mode Universal Biquadratic Filter Using Single DVCC

ISRN Electronics ◽

10.1155/2013/125746 ◽

2013 ◽

Vol 2013 ◽

pp. 1-5 ◽

Cited By ~ 6

Author(s):

Jiun-Wei Horng ◽

Zih-Yang Jhao

Keyword(s):

Current Conveyor ◽

Circuit Topology ◽

Voltage Mode ◽

Allpass Filters ◽

Differential Voltage ◽

Biquadratic Filter ◽

Differential Voltage Current Conveyor ◽

Output Filter

A voltage-mode universal biquadratic filter using a differential voltage current conveyor (DVCC), two capacitors, and two resistors is presented. The proposed circuit has four input terminals and three output terminals and can realize all the standard filter functions, which are lowpass, bandpass, highpass, notch, and allpass filters, without changing the circuit topology. Three simultaneous output filter responses can be obtained from some derived filter types. The proposed circuit employs only one DVCC that simplifies the configuration.

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