source:power supply Popular:adapter release time:2021-09-18 10:13:18 Article author:sznbone
What are the classifications of led switching power supplies?
The first category: Constant current type:
1. The constant current drive circuit is ideal for driving LEDs.
2, the constant current circuit is strictly forbidden to open the load completely.
3. The output current of the constant current drive circuit is constant, and the output DC voltage will vary within a certain range with the size of the load resistance.
4. Constant current top has the maximum withstand current and voltage value, so please limit the number of leds used.
The second category: regulated type:
1. After the voltage regulator circuit determines the various parameters, the output is a fixed voltage, but the output current changes with the increase or decrease of the load;
2. Although the voltage stabilizing circuit is not afraid of open load, it is strictly forbidden to short-circuit the load completely;
3, the voltage change after rectification will easily affect the brightness of the LED;
4. Appropriate resistors must be added so that the display brightness of each string of LEDs driven by a voltage regulator circuit can be uniform.
According to the design structure of the circuit can be divided into six categories
1. Capacitor step-down method: This method is more susceptible to the impact of power supply voltage fluctuations, and its efficiency and reliability are low. Because it is stepped down by capacitors, when flashing is used, due to the effect of charging and discharging, the moment it passes through the LED The current is extremely large and it is easy to damage the chip.
2. Resistive step-down method: This method has low efficiency and low reliability. The weight of the shape is still heavy, and the advantage is small size. In general, this method uses less power.
3. Conventional transformer step-down method: This type of power supply is rarely used. Although the appearance is small, the weight is still heavier, and the efficiency is relatively low, and the reliability is not high.
4. Electronic transformer step-down method: The disadvantage of this method is that the power supply efficiency is low, the voltage range is not wide enough, and the ripple interference is large. The market uses less power products of this type.
5. RCC step-down switching power supply: The advantage of this method is higher efficiency and wide application. The disadvantage is that the oscillation frequency is not continuous in the control mode, the switching frequency is not easy to control, the adaptability of abnormal load is poor, and the voltage ripple coefficient of the load is relatively large, so it is not recommended to use it.
6. PWM control mode switching power supply:
This method of power supply is recommended for design and use. It is composed of four parts, namely the input rectification and filtering part, the output rectification and filtering part, the PWM voltage stabilization control part, and the switching energy conversion part.
The basic working principle of P is that when the input voltage, internal parameters and external load change, the control circuit performs closed-loop feedback through the difference between the controlled signal and the reference signal, and adjusts the pulse width of the main circuit switching device to make the switch The output voltage or current of the power supply is stable (that is, the corresponding regulated power supply or constant current power supply). The advantages are high efficiency and stable output voltage and current. The power supply of this design type has complete protection measures.
Read recommendations:
QC3.0 24W USB Charger,24W USB Charger,24W USB Charger,USB Charger
3-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
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
Commonly used insulation materials for power cords
2021-10-27How to repair a switching power supply failure?power supply factory
2021-10-09Parallel current sharing of switching power supplies is becoming more and more popular?power supply
2021-10-09What are the classifications of led switching power supplies?
2021-09-18What are the advantages and disadvantages of switching power supply?UL ADAPTOR company
2021-09-18Power adapter detection?CE ADAPTOR factory
2021-09-14What are the classifications of switching power supplies? What are the control principles?switching
2021-09-14What are the precautions for the power adapter?
2021-09-08What are the vulnerable components and faults of the switching power supply?MKA ADAPTER price
2021-09-08What is rail switching power supply? what's the effect?
2021-07-24What are the modulation methods of switching power supply?
2021-07-24Where can the power adapter be used?
2021-07-22What is the reason why the switching power supply has no voltage output?
2021-07-22Precautions for the use of switching power supply
2021-07-16Precautions for the use of switching power supply!
2021-07-16How to dispense in the production of power adapters
2021-07-10How to deform the power supply
2021-07-10Use the power adapter scientifically and safely!
2021-07-10The development trend of switching power supply industry
2021-05-07Several important parts of switching power supply
2021-04-30Features and types of integrated regulated power supply
2021-04-17The PD power supply manufacturer tells you the choice of PD power adapter material, which is the bes
2021-04-09Japan PSE certification requirements for switching power supply adapters
2021-03-29Is the power supply the same as the power adapter?
2021-03-16The structural principle of switching power supply
2021-03-15What are the advantages of switching power supply?
2021-03-15[Power adapter manufacturer] What is the aging test of the power supply?
2021-03-12Is the power supply the same as the power adapter?
2021-03-12What is a switching power supply?
2021-02-22The difference between drive power supply and switching power supply
2021-02-22Popular recommended products
60W 6USB Charger,60W Charger,6USB Charger,Charger
2020-08-2712VDC8A 96W 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
2020-08-28Inductance & Coil
2020-08-2724W USB Charger,24W Charger,USB Charger
2020-08-27MKS-1201250HEU Switching Power Supply
2020-08-29QC3.0 24W USB Charger,24W USB Charger,24W USB Charger,USB Charger
2020-08-27200-500W Switching Power Supply
2020-08-2912W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER
2020-08-2745W PD Charger,45W Charger,PD Charger
2020-08-27MKS-1202000-36 Switching Power Supply
2020-08-2912-36W POE POWER SUPPLY
2020-08-27EI-28 AC ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter Linear Adapter
2020-08-28MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-2819V2A 36W Switching Power Supply
2020-08-2812W 2USB Charger,2USB Charger,12W Charger,USB Charger
2020-08-2724-65W Switching Power Supply
2020-08-29MKS-120200BS-36 Switching Power Supply
2020-08-29100-300W Charger,100W Charger,200W Charger,300W Charger
2020-08-27Transformer,High Frequency Transformer,Frequency Transformer
2020-08-273-100W PCBA power supply 3-100W Customized power supply 3-100W power supply
2020-08-27500W Charger,Charger
2020-08-28MKS-120200EU-36 Switching Power Supply
2020-08-2930-500W LED Power Supply 30-500W Power Supply
2020-08-2772-200W Switching Power Supply
2020-08-2924-36W Charger,36W Charger,24W Charger,30W Charger
2020-08-2730W PD Charger,30W Charger,PD Charger
2020-08-27EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-2840W 4USB Charger,40W Charger,4USB Charger
2020-08-27