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. .
Read recommendations:
EI-28 AC ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter Linear Adapter
72-200W Switching Power Supply
Understand the material characteristics of the power cord through the printing of the plug power cor
usb power adapter manufacturer customization.power adapter Factory
Popular recommended products
200-500W Switching Power Supply
2020-08-2924-65W Switching Power Supply
2020-08-2912V2ASwitching Power Supply
2020-08-28MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-28EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-28EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-28EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28ER42 High Frequency Transformer
2020-08-2712-36W POE POWER SUPPLY
2020-08-27Transformer,Power Transformer,Ring Power Transformer
2020-08-27Transformer,High Frequency Transformer,Frequency Transformer
2020-08-2712-24W Medical Switching Power Supply
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-2745W PD Charger,45W Charger,PD Charger
2020-08-2736-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger
2020-08-2724W USB Charger,24W Charger,USB Charger
2020-08-2724W 2USB Charger,24W Charger ,2USB Charger
2020-08-2710-24W Charger,24W Charger,10W Charger
2020-08-2730-500W LED Power Supply 30-500W Power Supply
2020-08-27Related Information
What are the conditions of use and maintenance methods for switching power supplies?
2022-05-21Some Frequently Asked Questions about Power Adapters
2022-05-20How to deal with the electromagnetic interference of switching power supply which is difficult in EM
2022-05-19Six situations and solutions that cause the whistling of switching power supplies.power supply price
2022-05-18Lightning Surge Test Method for Switching Power Adapters.adapter factory
2022-05-17Two common power adapter output overload protection methods.ADAPTOR price
2022-05-16Common fault maintenance skills of switching power supply
2022-05-14How should we choose the charger?
2022-05-13Power adapter expertise.CE ADAPTOR
2022-05-12How to solve the high temperature rise of switching power supply transformer?
2022-05-11The role of varistor in switching power supply
2022-05-10Structural characteristics and working principle of varistor
2022-05-09The role of varistor in switching power supply
2022-05-09What are the main components of switching power supply
2022-05-07Two ways for MOS devices to dissipate in high-power power supplies,CE ADAPTOR Processing
2022-05-06Several common insulation protection technologies for power adapters
2022-05-05What are the unique advantages of high frequency switching power adapter
2022-04-27What are the main components of switching power supply.China cnc plastic cutting
2022-04-26Troubleshooting method of switching power supply,CE ADAPTOR wholesale
2022-04-25How to use the power adapter correctly
2022-04-23What is the comparison between a charger and an adapter?
2022-04-23The optimal solution of drone power management solution!
2022-04-22Several common insulation protection technologies for power adapters
2022-04-21What are the unique advantages of high frequency switching power adapter
2022-04-20General Mechanism Analysis of Switching Power Adapter.ac power adapter wholesaler
2022-04-19Suppression method of low frequency ripple of switching power supply
2022-04-16Why is the power adapter making noise?
2022-04-15When the power adapter is in normal use, what is the normal temperature?
2022-04-1490% of people use the car charger incorrectly, are you using it right?CAR POWER SUPPLY sales
2022-04-13The difference between a power adapter and a voltage regulator
2022-04-12Popular recommended products
24V21A LED Power Supply 24V Power Supply 21A Power Supply
2020-08-273-8W Charger,3W Charger,8W Charger,4W Charger,5W Charger,6W Charger,7W Charger
2020-08-2712W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER
2020-08-2712W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY
2020-08-27Transformer,Power Transformer,Ring Power Transformer
2020-08-2718-25W Switching Power Supply
2020-08-2812V2ASwitching Power Supply
2020-08-28MK-C1806028 MKA ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-2824-65W Medical Switching Power Supply
2020-08-2730W PD Charger,30W Charger,PD Charger
2020-08-27MKS-120200EU-36 Switching Power Supply
2020-08-29EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-2824-65W Switching Power Supply
2020-08-29Inductance & Coil
2020-08-27EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-2830-500W LED Power Supply 30-500W Power Supply
2020-08-27ER42 High Frequency Transformer
2020-08-2736-65W Switching Power Supply
2020-08-29QC3.0 24W USB Charger,24W USB Charger,24W USB Charger,USB Charger
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-27EI Power Transformer Power Transformer
2020-08-27MKS-1202000-36 Switching Power Supply
2020-08-2940W 4USB Charger,40W Charger,4USB Charger
2020-08-2724V1.5A 36W Switching Power Supply
2020-08-2924W 2USB Charger,24W Charger ,2USB Charger
2020-08-27MKS-1201250HEU Switching Power Supply
2020-08-2972-200W Switching Power Supply
2020-08-2924-36W Charger,36W Charger,24W Charger,30W Charger
2020-08-2719V2A 36W Switching Power Supply
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-28