home > News > power supply

Several important parts of switching power supply

source:power supply     Popular:adapter     release time:2021-04-30 17:18:04     Article author:sznbone    

  Switching power supplies are favored by people for their obvious advantages such as low power consumption, high efficiency, and small size, and are widely used in computer equipment, electronic instruments, communication equipment and household appliances. The following will introduce the main technical indicators of the switching power supply.

Several important parts of switching power supply(图1)

  1. Input voltage range: When the input voltage of the switching power supply changes, the input voltage change range that keeps the output characteristics unchanged. The wider the range, the stronger the ability of the power supply to adapt to changes in the external city power, and the wider the working range of the switching power supply. It is related to the error amplifier inside the switching power supply, the gain of the sampling feedback adjustment circuit and the adjustment range of the duty cycle. At present, the input voltage range of the switching power supply has been 90V-270V, which can save the 110V/220V switch on many electrical appliances.

  2. Voltage regulation rate: The voltage regulation rate is also called voltage stability, which is the relative change of the output voltage when the output current does not change (that is, the load does not change) and the input AC working voltage changes. This technical index is used to verify whether the stability of the output voltage of the switching power supply meets the required specifications under the worst power supply voltage environment.

  3. Current regulation rate: The current regulation rate is also called the load regulation rate. It is the relative change of the output voltage when the input AC voltage is at the rated value (such as 220VAC) and the output current changes from the minimum value of 0 to the maximum value. This indicator is used to verify whether the output voltage stability of the switching power adapter meets the required specifications under the worst load environment.

  4. Output internal resistance: The ratio of the change in output voltage to the change in output current. The smaller the ratio, the smaller the change of the output voltage of the power supply with the size of the load, and the better the voltage regulation performance.

  5. Conversion efficiency: the ratio of the output power of the power supply to the input power. The higher the ratio, the higher the efficiency of the change, the smaller the size of the switching power supply, the higher the reliability. At present, the efficiency of switching power supplies can reach more than 90%.

  6. Ripple of the output voltage: Since the voltage stabilization process of the switching power supply is a process of continuous sampling and feedback adjustment, a superimposed and fluctuating ripple voltage will appear on the output DC voltage, that is, the output ripple voltage. The smaller the value, the better the output characteristics. There are two ways to express ripple: one is the effective value of the output ripple voltage; the other is the peak-to-peak value of the output ripple voltage. Generally, the specifications of the switching power supply are required to be less than 1% of the output DC voltage, and its bandwidth is 20Hz-20MHz or other higher frequencies, such as 100MHz. In the harsh environment of the switching power supply, the output instantaneous voltage after the output DC voltage plus the noise ripple should not exceed the output high and low voltage boundary (Min value and Max value), otherwise it may cause the power supply voltage to exceed or fall below the logic The circuit (such as TTL circuit) malfunctions due to the working voltage, which further causes the phenomenon of crash.


Read recommendations:

12W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER

36-65W Switching Power Supply

12-24W Medical Switching Power Supply

What is the reason why the switching power supply has no voltage output?

Where can the power adapter be used?

Related Information

Commonly used insulation materials for power cords

2021-10-27

How to repair a switching power supply failure?power supply factory

2021-10-09

Parallel current sharing of switching power supplies is becoming more and more popular?power supply

2021-10-09

What are the classifications of led switching power supplies?

2021-09-18

What are the advantages and disadvantages of switching power supply?UL ADAPTOR company

2021-09-18

Power adapter detection?CE ADAPTOR factory

2021-09-14

What are the classifications of switching power supplies? What are the control principles?switching

2021-09-14

What are the precautions for the power adapter?

2021-09-08

What are the vulnerable components and faults of the switching power supply?MKA ADAPTER price

2021-09-08

What is rail switching power supply? what's the effect?

2021-07-24

What are the modulation methods of switching power supply?

2021-07-24

Where can the power adapter be used?

2021-07-22

What is the reason why the switching power supply has no voltage output?

2021-07-22

Precautions for the use of switching power supply

2021-07-16

Precautions for the use of switching power supply!

2021-07-16

How to dispense in the production of power adapters

2021-07-10

How to deform the power supply

2021-07-10

Use the power adapter scientifically and safely!

2021-07-10

The development trend of switching power supply industry

2021-05-07

Several important parts of switching power supply

2021-04-30

Features and types of integrated regulated power supply

2021-04-17

The PD power supply manufacturer tells you the choice of PD power adapter material, which is the bes

2021-04-09

Japan PSE certification requirements for switching power supply adapters

2021-03-29

Is the power supply the same as the power adapter?

2021-03-16

The structural principle of switching power supply

2021-03-15

What are the advantages of switching power supply?

2021-03-15

[Power adapter manufacturer] What is the aging test of the power supply?

2021-03-12

Is the power supply the same as the power adapter?

2021-03-12

What is a switching power supply?

2021-02-22

The difference between drive power supply and switching power supply

2021-02-22

Popular recommended products

12-36W POE POWER SUPPLY

2020-08-27

500W Charger,Charger

2020-08-28

36-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger

2020-08-27

MKS-120200BS-36 Switching Power Supply

2020-08-29

45W PD Charger,45W Charger,PD Charger

2020-08-27

3-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply

2020-08-27

12W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY

2020-08-27

60W 6USB Charger,60W Charger,6USB Charger,Charger

2020-08-27

12W 2USB Charger,2USB Charger,12W Charger,USB Charger

2020-08-27

24-36W Charger,36W Charger,24W Charger,30W Charger

2020-08-27

MKS-1201250HEU Switching Power Supply

2020-08-29

MKS-1202000-36 Switching Power Supply

2020-08-29

12V2ASwitching Power Supply

2020-08-28

MKS-120200EU-36 Switching Power Supply

2020-08-29

Transformer,Power Transformer,Ring Power Transformer

2020-08-27

EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter

2020-08-28

Inductance & Coil

2020-08-27

200-500W Switching Power Supply

2020-08-29

36-65W Switching Power Supply

2020-08-29

MKS-1401700H Switching Power Supply

2020-08-29

100-300W Charger,100W Charger,200W Charger,300W Charger

2020-08-27

3-100W PCBA power supply 3-100W Customized power supply 3-100W power supply

2020-08-27

QC3.0 24W USB Charger,24W USB Charger,24W USB Charger,USB Charger

2020-08-27

3-8W Charger,3W Charger,8W Charger,4W Charger,5W Charger,6W Charger,7W Charger

2020-08-27

Transformer,High Frequency Transformer,Frequency Transformer

2020-08-27

40W 4USB Charger,40W Charger,4USB Charger

2020-08-27

EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter

2020-08-28

24V21A LED Power Supply 24V Power Supply 21A Power Supply

2020-08-27

30-500W LED Power Supply 30-500W Power Supply

2020-08-27

24W 2USB Charger,24W Charger ,2USB Charger

2020-08-27
Copyright 2020 © Merryking Technology Co., Ltd. All rights reserved