EI-13x20 5VA transformer

Core role

1.Safe voltage conversion: step down the mains voltage of 220V to safe voltages such as 12V/24V to power the control circuit;

2.Signal isolation: Blocking common-mode interference between the primary and secondary circuits through magnetic circuit coupling, improving the system's anti-interference capability;

3.Impedance matching: Optimizes signal transmission efficiency in scenarios such as audio equipment and sensors.

Key Features

◆Structural design

- Iron core: EI-13x20 silicon steel sheet stepped lamination, magnetic leakage <5%;

- Winding: Primary 0.1mm enameled wire (220V side), secondary 0.3mm wire diameter (low voltage side);

- Protection: Blue epoxy resin potting, IP20 protection grade.

◆Electrical performance

- Capacity: 5VA (maximum continuous load);

- No-load current ≤ 10mA, efficiency ≥ 85%;

- Insulation resistance ≥ 100MΩ (500VDC test).

◆Environmental adaptability

Operating temperature: -20°C ~ +60°C, humidity ≤ 95% RH (non-condensing).

How it works

Electromagnetic induction: The input AC current generates an alternating magnetic field through the primary winding, which is conducted to the secondary winding through the EI core;

Voltage conversion: voltage reduction is achieved through the turns ratio (e.g. 220V → 12V corresponds to 18:1), and energy is transferred in the form of magnetic field;

Isolation characteristics: There is no direct electrical connection between the primary and secondary sides, which complies with the GB19212.1-2003 safety standard.

Model parameter