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<p>Does the toroidal transformer charge electricity under no-load conditions? Today we will take a closer look: First of all, we must understand that the loss of the transformer is divided into active loss and reactive loss. Active loss includes iron loss and copper loss. The reactive power loss is composed of two parts. One part is the loss caused by the excitation current or no-load current. </p><p><br></p><p>It is related to the iron core, but not to the load. Different transformer specifications determine the power consumption of this transformer. The second is the no-load test of the transformer, that is, the primary circuit of the transformer is closed and the secondary winding circuit is open. At this time, the no-load current exists in the primary circuit, but the no-load current is small. This part of the power is the power consumption of the transformer when it is no-load In addition, the no-load loss of the transformer includes the hysteresis and eddy current loss in the iron core and the loss of the no-load current on the primary coil resistance. The former is called iron loss and the latter is called copper loss. Since the no-load current is very small, the latter can be omitted. Therefore, the no-load loss is basically the iron loss. (Take the 300W / 220V / 24V <a href="https://www.fs-xwd.com/xianweida-toroidal-transformers-oem-odm" rel="noopener noreferrer" target="_blank">toroidal transformer </a>as an example: When the primary side of the transformer is closed, the no-load current of the transformer is about 30mA, the primary resistance is 3.7Ω, the core weight is 2.5Kg, and the core loss coefficient is 1.5W / Kg. When the power consumption of the transformer is: Po = P empty + P iron loss == (0.03A) 2 × 3.7Ω + 2.5Kg × 1.5W / Kg≈0.003W + 3.75W = 3.753W). It can be seen from this that the power consumption of the 300W transformer under no-load conditions is very small, accounting for about 1.25% of the total power of the transformer; the ratio of the power consumption of the transformers of different powers under no-load conditions to the total power will be Slightly different.</p>
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