source:Industry News Popular:adapter release time:2021-09-09 10:57:08 Article author:sznbone
Switching power supply output DC voltage is low
Many consumers will say that they will always encounter some faults when using switching power supplies, but they don’t know what are the reasons for these faults. In fact, it will bring great difficulties to our actual use. , So in order to help you better solve these problems for me, the editor here today will give you a detailed introduction about the reasons for the low output DC voltage of the switching power supply?
We want to master the operation methods to solve these power supplies. We must first understand the causes of these failures. Only in this way can we better solve the problems. Under normal circumstances, everyone knows that the reason why the output DC voltage is low is because the voltage stabilization control circuit will cause the output voltage to be too low. In addition, the reasons we know are not very many.
But in fact, there are some other reasons that can cause the output voltage to be too low, which are mainly divided into the following points. First, the switching power supply load has a short-circuit fault. In this case, we should disconnect all of our power circuit. The load is used to distinguish whether the power circuit is faulty or the load circuit is faulty. If the load circuit is disconnected and its voltage output is normal, then it means that our debt is too heavy, but if the person is abnormal, it means that it is The circuit of the switching power supply has malfunctioned. The second situation is the failure of the rectifier diode and filter capacitor at the output voltage side. When this situation is encountered, we can judge by substitution. Then there is the switch. The performance of the power tube decreases. In this case, it will inevitably cause the switching tube to fail to reverse normally. This will increase the internal resistance of the power supply and decrease the load capacity. This also leads to our entire power switch. An important reason why it cannot be used normally, the primary stage of the switching power tube is usually connected to a resistor with a small resistance but a large power, which is used for over-current protection detection resistance. The resistance of this kind of resistance is generally Between 0.2 and 0.8, if the resistance only changes or the welding is open, poor contact will also cause the output voltage to be too low.
Of course, the poor contact of the power output line will also cause the output voltage to be too low, and the power of the voltage grid is too low, which is also an important reason we must consider, although the switching power supply can still output the rated voltage under the low voltage situation , But when our grid voltage is lower than the minimum voltage limit of the power switch, the output voltage will also be too low. Let us understand the reasons for the low output DC voltage, the next thing you need to master is some maintenance methods. The maintenance methods are actually the causes of different faults in the tools to conduct independent investigations. We must know the different situations. In fact, they The maintenance methods that need to be adopted are also different. Of course, the same method is to use a multimeter to check whether the high voltage DC, the filter capacitor has deteriorated and whether the capacity has decreased. Everyone can judge whether it can be charged and discharged normally. Under normal circumstances, if we detect a certain part and no problem is found, we can continue to detect other parts. There must be a problem in one of the parts, which will cause our power supply to operate abnormally. .
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