Power Transformer for Public Address Amplifier

The transformer is widely use in the Stage amplifier, KTV, Public Address System and other professional amplifier. According to the main power request of Amplifier, it requests the transformer is with high efficiency, small loss, Low interference resistance, small magnetic leakage, No static current sound, sufficient power, low temperature rise.

For the amplifier transformer, customer very care about the interference issue. The raw material using and processing technology are very important to improve interference.
 
The main material core, what we use is 0.23mm high magnetic flux, low loss oriented silicon steel core. With this core, the transformer’s static loss is low.

Using CNC automatic arrangement technology, strengthen the coupling between winding and winding. Reduce leakage of internal magnetic field of winding.
 

Power Range: 10VA to 450VA (EI41 - EI133.2)

Phase: Single

Input/Output: Customized

Insulation: up to 4kV (Hi-pot)

Sample Lead Time： 3~5 days
 Production Lead Time：3 Weeks  (Urgent order can be negotiated)
 Quantity：No MOQ Require

Specification Table

EI Transformer Main Materials (IQC process)

All the material is inspected strictly with ISO9001:2015 quality program.

Core: appearance inspection and core loss test.

Copper wire: pinhole test and coat of adhesion test

 EI  Transformer Process

• EI lamination has 0.35mm and 0.5mm thickness, material has Z11/H12/H14/H18/H50 of option.
• The insulation for coil has 0.075/0.125mm thickness polyster film. 0.18/0.25mm DMD insulation paper and T410 Nomex paper. The brand of polyster film is DUPONT. The layers of overlap is deponds on the safety agent requirements.
• Primary and Secondary winding wire is polyesterimid enameled, have 130/155/180/200degree for option.
• Primary lead wire from type UL1617 double insulation for 600V voltage and 105 degree or UL3321 XLPE for 600V and 150degree.
• Secondary lead wire from type UL1015 for 600V voltage and 105 degree.
• Outer insulation is overlap 1 layer 0.075/0.125mm thickness polyester film or 0.18/0.25mm DMD insulation paper or T410 Nomex paper.

EI  Transformer Testing Items

• Exciting current & core loss: 100% test
• DC Resistance: 100% test
• Layer insulation: 100% test
• Loading test: 100% test
• Hi-pot test: 100% test, but the time is only approx 10seconds for the production-run.
• Aging test: Spot check, 10% of product quantity