source:power adapter Popular:adapter release time:2021-11-30 09:21:53 Article author:sznbone
The following are the main reasons for the low output voltage caused by the power adapter:
1. Switching power supply load short circuit failure (especially DC/DC converter short circuit or poor performance, etc.). At this time, first disconnect all loads of the switching power supply circuit and check whether the switching power supply circuit is faulty or the load circuit is faulty. If the load circuit is disconnected and the voltage output is normal, it means that the load is too heavy; or it is still abnormal, it means that the switching power supply circuit is faulty.
2. The failure of the filter capacitor or rectifier diode at the output voltage can be judged by the replacement method.
3. The performance of the switch tube is reduced, which causes the switch tube to fail to conduct normally, which increases the internal resistance of the power supply and reduces the load capacity.
4. Poor switching transformer not only causes the output voltage to drop, but also causes insufficient excitation of the switching tube and thus damages the switching tube.
5. The poor 300V filter capacitor results in poor load carrying capacity of the power supply, and the output voltage will drop as soon as the load is connected.
The output voltage is too high
Excessive output voltage generally comes from voltage stabilization sampling and voltage stabilization control circuits. In the closed control loop composed of DC output, sampling resistor, error sampling amplifier such as TL431, optocoupler, power control chip and other circuits, any one of the components will cause the output voltage to rise.
The fuse is normal, no output voltage
The fuse is normal and no output voltage indicates that the switching power supply is not working or has entered a protection state. The first step is to check the value of the startup voltage of the startup pin of the power control chip. If there is no startup voltage or the startup voltage is too low, check whether the external components of the startup pin and the startup resistor are leaking.
If the power control chip is normal, the fault can be quickly found through the above monitoring. If there is a startup voltage, measure whether there are high and low level jumps at the output of the control chip at the moment of power-on. If there is no jump, it means that the control chip is damaged, the peripheral oscillation circuit components are damaged or the protection circuit is faulty, and the control chip is replaced. Chips, check the peripheral components, and check them one by one; if they are changing, most of them are bad or damaged switch tubes.
The difference and relationship between switching power supply and linear power supply
Our common power supplies, including power adapters and chargers, are all switching power supplies. Switching power supply is a power supply that maintains a stable output DC voltage by controlling the time ratio of switching on and off. The switching power supply is generally composed of pulse width modulation control IC and MOSFET field effect transistors. High-frequency switching power supply is the direction of its development. High-frequency makes switching power supply miniaturized and enables switching power supply to enter a wider range of applications, especially in the high-tech field. It promotes the miniaturization and lightness of high-tech products. change. In addition, the development and application of switching power supplies are of great significance in saving energy, saving resources and protecting the environment.
Read recommendations:
72-200W Switching Power Supply
ER42 High Frequency Transformer
Transformer,Power Transformer,Ring Power Transformer
Is the power adapter a switching power supply?ac power adapters Production
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 is the structure of the notebook power adapter?LINEAR ADAPTOR
2022-02-15What is a power adapter?Linear Power Adapter
2022-02-15Power adapter characteristics
2021-12-17How to choose the right power adapter for yourself?
2021-12-17R & D and production of more types of power adapters.power adapter Manufacturing
2021-12-07Power adapter CE certification.power supply adapter company
2021-12-03The main purpose and function of the power adapter.indian adapter Manufacturing
2021-12-03The difference between power adapter.dc power adapter wholesaler
2021-12-02Application of high frequency power adapter.dc power adapter wholesaler
2021-12-02Principle of switching power supply.india plug charger Merchant
2021-11-30Understand the cause of low output voltage caused by power adapter.ac power adapters Production
2021-11-30Is the power adapter a switching power supply?ac power adapters Production
2021-11-27What are the common insulation shielding technologies for power adapters?ac power adapters Productio
2021-11-279V power adapter price.india plug charger Merchant
2021-11-26power adapter customization.ac power adapter wholesaler
2021-11-26U.S. power adapter manufacturers.india plug charger Merchant
2021-11-25Power adapter customization.indian amplifier wholesaler
2021-11-259V power adapter.wall charger Factory
2021-11-24Switching power adapter manufacturer customization.adapter manufacturer
2021-11-23U.S. power adapter.adapter manufacturer
2021-11-23Quality issues must be considered when power adapters
2021-11-20usb power adapter.power supply factory
2021-11-20US standard power adapter wholesale customization.adapter manufacturer
2021-11-19Which switching power adapter is better.CE ADAPTOR wholesale
2021-11-19Which computer power adapter is of good quality.ac power adapter Processor
2021-11-18How to choose the right power adapter for yourself?ac power adapter Processor
2021-11-18Switching power adapter customization.AC ADAPTER wholesale
2021-11-17Which is the best standard power adapter?CE ADAPTOR Production
2021-11-17How to choose the right power adapter for yourself?
2021-11-1624V power adapter wholesale customization.LINEAR ADAPTOR sales
2021-11-16Popular recommended products
45W PD Charger,45W Charger,PD Charger
2020-08-27EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-2810-24W Charger,24W Charger,10W Charger
2020-08-27MK-C1806028 MKA ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-2819V2A 36W Switching Power Supply
2020-08-28Inductance & Coil
2020-08-2730W PD Charger,30W Charger,PD Charger
2020-08-27MKS-1202000-36 Switching Power Supply
2020-08-2940W 4USB Charger,40W Charger,4USB Charger
2020-08-27MKS-1203000EX Switching Power Supply
2020-08-29MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-2812V2ASwitching Power Supply
2020-08-2824-65W Medical Switching Power Supply
2020-08-273-100W PCBA power supply 3-100W Customized power supply 3-100W power supply
2020-08-27500W Charger,Charger
2020-08-2824V1.5A 36W Switching Power Supply
2020-08-29100-300W Charger,100W Charger,200W Charger,300W Charger
2020-08-27EI-28 AC ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter Linear Adapter
2020-08-28MKS-1401700H Switching Power Supply
2020-08-2912W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY
2020-08-27Transformer,Power Transformer,Ring Power Transformer
2020-08-27EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-28ER42 High Frequency Transformer
2020-08-273-15W Switching Power Supply
2020-08-283-8W Charger,3W Charger,8W Charger,4W Charger,5W Charger,6W Charger,7W Charger
2020-08-2718-25W Switching Power Supply
2020-08-28MKS-1201250HEU Switching Power Supply
2020-08-2972-200W Switching Power Supply
2020-08-29MKS-120200BS-36 Switching Power Supply
2020-08-29