Main products: power adapter, medical power, LED power, charger and so on.
Shenzhen Lianyunda Electronics Co., Ltd. is committed to doing a good job in power supply products, and sincerely welcomes customers to contact us by phone or email.
The Unicom power adapter has a wide range of applications, fine workmanship, over-voltage, over-current standard design, safety and stability, real materials, quality and quantity, so that you can use more confidence.
How to check the quality of the power adapter transformer, we need to check what aspects, Lianyunda Electronics here to share some methods.
1. Does the primary inductance meet the requirements?
2. Primary to secondary analogy, primary versus feedback
3. The capacitance between the primary and secondary, the capacitance of the primary feedback, and the capacitance between the secondary feedback. The smaller the better, the average is only a few dozen P
4. Coupling degree: Primary secondary coupling coefficient, coupling coefficient between primary feedbacks
6. Withstand voltage, primary secondary withstand voltage, primary feedback withstand voltage, all coils with magnetic withstand voltage
10. Transformer label
11. Whether the core and the skeleton meet the requirements, especially for the skeleton.
The above test requires the use of a transformer integrated tester, pressure gauge. How to test the coupling degree, withstand voltage and primary and secondary capacitance, what is the criterion for evaluation? Transformer comprehensive tester, the larger the coupling reading, the better, the maximum 100%, the general transformer can not reach this value, generally more than 80%, 90% the following.
Withstand voltage: generally primary secondary 3750VAC 1 minute set current 3mA, no breakdown, no flashover, no excessive noise
Diurnal capacitance: the smaller the better (for the flyback transformer). For multi-winding transformers, sometimes it is necessary to consider the short-term problems between the same sides, such as: 1. Poor manufacturing of the enameled wire (pinhole phenomenon); Various coil products are damaged in the enameled wire during production and processing. The thickness of the enameled wire is different, and the setting of the test voltage is also different;
The transformer is the core component of the power adapter, and its quality is directly related to the quality of the power supply. Shenzhen Lianyunda Electronics strictly controls the quality of quality control components to produce high quality, high quality power supplies.