EI-13X15 3VA Blue transformer
Core role
Voltage conversion: High voltage AC (such as 220V) is reduced to a safe voltage (12V/24V) through electromagnetic induction.
Electrical isolation: There is no direct electrical connection between the primary and secondary sides, which blocks common-mode interference between circuits and improves equipment safety.
Impedance matching: Optimizes signal transmission efficiency in scenarios such as audio equipment and sensors.
Core Features
Structural design
- Iron core: EI-13X15 silicon steel sheets are stacked in steps, with low magnetic leakage and low vibration and noise;
- Winding: Copper wire winding, primary thin wire (high voltage side), secondary thick wire (low voltage side);
- Protection: Blue epoxy resin encapsulated housing, protection grade IP20, dustproof and touchproof.
Performance parameters
- Capacity: 3VA (no-load loss ≤ 0.8W);
- Insulation grade: Class B (130℃ temperature resistance), temperature rise ≤60K;
- Frequency: 50Hz/60Hz industrial frequency.
Advantages
It has a small size (fits into compact spaces), low cost, and a dry-type design that is maintenance-free. However, there is a slight electromagnetic hum during power frequency operation.
How it works
Electromagnetic induction: The input AC current generates an alternating magnetic field through the primary winding, which is coupled to the secondary winding through the EI iron core.
Voltage conversion: The secondary winding induces a low-voltage electromotive force through the turns ratio (such as N₂/N₁=1:18) to achieve energy transfer.
Isolation characteristics: Magnetic circuit coupling realizes electrical isolation between primary and secondary sides, and only supports AC input.
Typical application areas
1.Industrial control
The 24V isolated power supply of the PLC control cabinet prevents high voltage interference.
Low voltage power supply for machine tool sensors and alarm indicators.
2.Consumer electronics
Auxiliary power supply for smart home devices such as thermostats.
Audio amplifier impedance matching circuit.
3.Instruments
Voltage stabilizing modules for electric meters and testing instruments.
Laboratory low voltage experimental equipment power supply.