1, SMPS transformers appearance: size, clean, solder conditions, dipping bright
2, turns ratio, out, secondary turns ratio
3, primary (or secondary) inductance
4, DC resistance
5, the output voltage, current or output power
6, transformer efficiency
7, interference and anti-interference ability 1-4 SMPS transformer manufacturer inspection 5-7 power machine test
Measure the primary leakage inductance of the transformer: the secondary of all transformers are shorted up, then the primary inductance is the primary leakage inductance. And so on, to measure a secondary leakage is the primary and other items are short-circuit, then measured a secondary inductance is its leakage. In addition to the filter on the circuit to remove the spikes, but also by reducing the leakage inductance of the flyback transformer to cut the spikes. Improving the winding process of the transformer can reduce the leakage inductance of the transformer.
Another can be used sandwich winding process can reduce the leakage inductance of the transformer. Or the use of high permeability CORE can also reduce the leakage inductance of the transformer you said that the tip may make the switch tube damage.
High-core magnetic core is mainly used for low-frequency weak field, where the field is the working magnetic field strength, the unit is mT. Power material mainly work in the high frequency field, when the core loss has been negligible, because it will lead to core PC30, PC40 and other materials of the grade difference is mainly the power loss. Low power consumption of materials can improve the operating frequency and magnetic field, followed by increased transmission power, which can be miniaturized. High-conductivity materials because of the formula and Technology and other reasons, strong field power consumption is very high, then the Bs than the power material is low, so can not mix. Besides, all kinds of materials have their own advantages and disadvantages, no one material to pack the world.
More transformer in www.xp-elec.com