source:Industry News Popular:adapter release time:2022-05-14 09:18:25 Article author:yu
Power failures account for the majority of electronic equipment failures in electrical troubleshooting. Therefore, being familiar with the common faults and maintenance skills of switching power supplies is conducive to shortening the maintenance time of electronic equipment failures and improving personal equipment maintenance skills.
1. Common faults
⑴ Fuse blown:
In general, a blown fuse indicates a problem with the internal circuit of the power supply. Since the power supply works under the condition of high voltage and high current, the fluctuation and surge of the grid voltage will cause the current in the power supply to increase instantaneously and cause the fuse to blow. The key point should be to check the rectifier diodes, high-voltage filter electrolytic capacitors, inverter power switch tubes, etc. at the input end of the power supply, and check whether these components have breakdown, open circuit, damage, etc. If the fuse is indeed blown, you should first check the various components on the circuit board to see if the surface of these components is burnt and whether there is electrolyte overflow. . It is necessary to pay special attention: when a component is found to be damaged, it must not be turned on directly after replacement. It is very likely that the replaced component will be damaged because other high-voltage components are still faulty. Be sure to conduct a comprehensive inspection of all high-voltage components of the above circuit. After checking and measuring, the fault of blown fuse can be completely ruled out.
(2) No DC voltage output or unstable voltage output
If the fuse is in good condition, under the condition of load, there is no output of DC voltage at all levels. This situation is mainly caused by the following reasons: open circuit and short circuit in the power supply, overvoltage and overcurrent protection circuit failure, auxiliary power supply failure, oscillation circuit not working, power supply overload, rectifier diode in high frequency rectifier filter circuit Breakdown, leakage of filter capacitors, etc. After measuring the secondary components with a multimeter and ruling out the breakdown of the high-frequency rectifier diode and the short-circuit of the load, if the output is zero at this time, it is certain that the control circuit of the power supply is faulty. If there is some voltage output, it means that the pre-stage circuit is working normally, and the fault is in the high-frequency rectifier and filter circuit. The high-frequency filter circuit is mainly composed of a rectifier diode and a low-voltage filter capacitor to form a DC voltage output. The breakdown of the rectifier diode will cause no voltage output in the circuit, and the leakage of the filter capacitor will cause the output voltage to be unstable and other faults. The damaged components can be detected by statically measuring the corresponding components with a multimeter.
(3) Poor power load capacity
Poor load capacity of power supply is a common fault, which usually occurs in old-fashioned or long-working power supplies. Should focus on checking whether the Zener diode generates heat and leakage, the rectifier diode is damaged, the high-voltage filter capacitor is damaged, etc.
Read recommendations:
40W 4USB Charger,40W Charger,4USB Charger
EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
How to deal with the electromagnetic interference of switching power supply which is difficult in EM
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
EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-2836-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger
2020-08-273-100W PCBA power supply 3-100W Customized power supply 3-100W power supply
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-273-15W Switching Power Supply
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-2812-24W Medical Switching Power Supply
2020-08-2772-200W Switching Power Supply
2020-08-2924W USB Charger,24W Charger,USB Charger
2020-08-27200-500W Switching Power Supply
2020-08-2924-65W Switching Power Supply
2020-08-293-8W Charger,3W Charger,8W Charger,4W Charger,5W Charger,6W Charger,7W Charger
2020-08-2712VDC8A 96W power supply
2020-08-2812W 2USB Charger,2USB Charger,12W Charger,USB Charger
2020-08-27MKS-1202000-36 Switching Power Supply
2020-08-29500W Charger,Charger
2020-08-2824V1.5A 36W Switching Power Supply
2020-08-2919V2A 36W Switching Power Supply
2020-08-28MKS-1401700H Switching Power Supply
2020-08-2960W 6USB Charger,60W Charger,6USB Charger,Charger
2020-08-27Inductance & Coil
2020-08-27EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-2818-25W Switching Power Supply
2020-08-28ER42 High Frequency Transformer
2020-08-2724-36W Charger,36W Charger,24W Charger,30W Charger
2020-08-27MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28MKS-120200BS-36 Switching Power Supply
2020-08-2924W 2USB Charger,24W Charger ,2USB Charger
2020-08-2724-65W Medical Switching Power Supply
2020-08-27MKS-1201250HEU Switching Power Supply
2020-08-29