Educación

 

Generating bipolar magnetic fields by using unipolar power sources

 

A. Hernández, E.E. Mazón, E. Mena, and M.E. Cano

 

Centro Universitario de la Ciénega. Universidad de Guadalajara, Av. Universidad # 1115, Col. Linda vista, 47800, Ocotlán, Jalisco, México, e-mails: h.s.alfonso@gmail.com; mazon_valadez@hotmail.com; emena@cuci.udg.mx; meduardo2001@hotmail.com

 

Received 25 February 2015;
Accepted 27 July 2015

 

Abstract

A low cost current inversion system is presented as solution to achieve bipolar magnetic fields through a series array of analog programmable unipolar power sources. The system is based on a digital signal controller to provide an accurate zero-crossing detection of the voltage supplied to a commercial electromagnet, and a polarity inversion system composed of a set of switches in H-bridge configuration and optical isolators. Furthermore a stage of magnetic uncoupling is performed to generate a pair of independent signals to drive each power supply. In general the system have shown be able to generate fine and coarse magnetic field sweeps, which can be used to conduct studies of basic science or academic works in a physics laboratory, bypassing the absence of an expensive bipolar power source.

Keywords: Magnetic field; zero crossing; power inverter.

 

PACS: 07.05.Dz; 07.05.Fb; 07.05.Hd

 

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