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This article describes a circuit arrangement for taping the resonant secondary winding in a ferro transformer at the desired secondary voltage required.
English (United States)
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Ac Isolated Secondary Voltage
This article describes a circuit arrangement for taping the resonant secondary
winding in a ferro transformer at the desired secondary voltage required.
The dielectric strength voltage potential between primary and secondary
voltages in power isolation transformers sometimes does not meet
INTERNATIONAL ELECTROTECHNICAL COMMISSION (PUBLICATION 380)
requirements of 3750V dielectric strength voltage. order to use 1500V dielectric
strength voltage transformers in products and not degrade a higher internal
safety standard, the circuit arrangement disclosed herein presents a solution to
the problem if an approved ferro transformer is present within the product.
The ferro transformer has a resonant secondary winding that has AC root
mean square (RMS) voltage present as shown in the drawing. It is assumed that
the required dielectric strength potential between the primary and secondary
windings is present in an approved ferro transformer. By taping the resonant
winding at the desired AC secondary voltage required, the safety requirement is
also met. Since the secondary is a regulated output, normal Å10 percent line
voltage or similar AC voltage requiring a regulated AC voltage is met.