What is the no-load operation of a high-frequency transformer?

No-load operation of a high-frequency transformer refers to the operation of the transformer when there is no load or the load is extremely small. In this case, the secondary winding of the transformer is either not connected to a load or the load current is very small, and the transformer essentially does not supply power to the external circuit.

Here are several characteristics of the no-load operation of a high-frequency transformer:

1. No load current: Since the secondary winding is not connected to a load or the load current is very small, the current in the secondary winding is almost zero.

2. Magnetic flux saturation: In the no-load state, if the input voltage of the transformer remains constant, the magnetic flux may reach saturation because there is no demagnetizing effect of the load current.

3. Low efficiency: Although the transformer does not supply power to the load during no-load operation, the primary winding still absorbs a certain amount of power from the power supply to maintain the establishment of the magnetic field. This part of the power is mainly converted into heat, resulting in very low efficiency.

4. High losses: The losses of the transformer during no-load operation mainly include iron losses (hysteresis losses and eddy current losses in the magnetic core) and copper losses (resistive losses in the primary winding). Since there is no load current, copper losses are relatively small, but iron losses still exist.

5. Constant voltage ratio: Ideally, the voltage ratio of the transformer (the ratio of primary voltage to secondary voltage) remains the same in the no-load state as in the loaded state, because the voltage ratio depends only on the turns ratio of the windings.

6. Possible noise and vibration: Due to the saturation of magnetic flux and the magnetic force in the magnetic circuit, a high-frequency transformer may produce more noise and vibration during no-load operation than during loaded operation.

High-frequency transformers are commonly used in high-frequency circuits such as switch-mode power supplies. Their design and material selection are all aimed at efficient operation at high frequencies. No-load operation is not the normal working state of a high-frequency transformer, but the design must take into account the losses and potential problems in the no-load state to ensure the reliability and efficiency of the transformer throughout its operating range.

 Why is the high-frequency transformer of Golden Eagle recognized by customers?

1) Lean production line with one-piece flow, no accumulation

2) Full automation of winding, assembly, and comprehensive testing

3) 100% raw materials from well-known enterprises to ensure material quality from the source