Comparison and Improvement for PWM Output Circuit

Li Guo; Xi Ping Wang; Wei Li; Yu Min Yang; Man Fan

doi:10.4028/www.scientific.net/AMM.150.139

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 150Comparison and Improvement for PWM Output Circuit

Comparison and Improvement for PWM Output Circuit

Abstract:

The switch power amplifier is widely used in magnetic bearing system, the lab uses pulse width modulator TL494 which is produced by U.S. Texas instruments company to drive power tubes. It can generate PWM signal. In this paper, a three level half bridge switch power amplifier is designed based on TL494.The original design of the double op-amp circuit is analyzed and improved through analyzing positive input signal for the internal error amp of TL494. Removing the redundant circuit, the new signal input circuit can realize the same function as the double op-amp circuit and the circuit structure can be more compact.

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Periodical:

Applied Mechanics and Materials (Volume 150)

Pages:

139-143

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.150.139

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Online since:

January 2012

Authors:

Li Guo, Xi Ping Wang, Wei Li, Yu Min Yang, Man Fan

Keywords:

Magnetic Bearing, Switch Power Amplifier, Tl494

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