source:Industry News Popular:adapter release time:2022-03-11 15:03:34 Article author:sznbone
We all know that the power adapter needs current to operate, and the power cord needs to be used to transmit current, but some people should not know about the DC power cord. The following editor will explain it to you:
DC power cord is a wire used for DC power supply. The so-called DC power refers to the current whose magnitude and direction do not change with time, also known as constant current, which is a closed conductive loop composed of DC power supply and resistance. It is mainly composed of four parts: conductor, insulating layer, shielding layer and shelter layer.
The DC power cord generally has two lines, one is all black, the other is black with a solid white line in the middle, the all black line is the negative pole, and the other is the positive pole. The electrical appliance is plugged in; if the connection is wrong, it will not only affect the correct use of the electrical appliance, but even seriously damage the electrical appliance; so it is best to use a multimeter to determine the DC voltage.
What is the main reason for the low output voltage caused by the power adapter? Many people do not know about these professional knowledge. Today, the editor has compiled some information to introduce the main reasons for the low output voltage caused by the power adapter!
1. The power supply load is short-circuited (especially the DC/DC converter is short-circuited or has poor performance, etc.), at this time, first disconnect all the loads of the adapter circuit, and check whether the adapter circuit is faulty or the load circuit is faulty. If the load circuit is disconnected and the voltage output is normal, the load is too heavy; or if it is still abnormal, the adapter circuit is faulty.
2. The failure of the filter capacitor or rectifier diode at the output voltage end can be judged by the replacement method.
3. The performance of the switch tube is degraded, which leads to the failure of the switch tube to conduct normally, which increases the internal resistance of the power supply and reduces the load capacity.
4. The poor switching transformer will not only cause the output voltage to drop, but also cause insufficient excitation of the switch tube, which will damage the switch tube.
5, 300V filter capacitor is not good, resulting in poor load capacity of the power supply, and the output voltage will drop as soon as the load is connected.
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