source:Industry News Popular:adapter release time:2022-05-12 11:34:25 Article author:yu
The first, pulse width modulation
PWM is abbreviated as Pulse Width Modulation. Its characteristic switching cycle is a constant value, and the duty cycle is changed by adjusting the pulse width to achieve the purpose of voltage regulation. Its core PWM controller. The application of pulse width modulation switching power supply is the most common, and its duty cycle adjustment range is large, and PWM can also be synchronized with the clock of the main system.
The second type, pulse frequency modulation
Referred to as PFM, that is, pulse frequency modulation. Its characteristic is that the pulse width is a constant value, and the duty cycle is changed by adjusting the switching frequency to achieve the purpose of voltage regulation. At its core is the PFM controller. The pulse frequency modulated switching power supply is especially suitable for portable equipment, which can reduce the quiescent current of the control chip under the condition of low duty cycle and low frequency.
The third type, pulse density modulation
Abbreviated as PDM, which means pulse density modulation. Its characteristic is that the pulse width is a constant value, and the purpose of voltage regulation is achieved by adjusting the number of pulses. It adopts zero-voltage technology, which can significantly reduce the loss of the power switch tube.
Fourth, mixed modulation
It is a combination of the first and second ways. The switching period and pulse width are not fixed and can be adjusted. It contains PWM controller and PFM controller.
The above four working modes are collectively referred to as "time ratio control" (TRC for short) mode, among which PWM controller is the most widely used. It should be pointed out that the PWM controller can be used as an independent integrated circuit, and can also be integrated in a switching regulator or a single-chip switching power supply. Among them, the switching regulator is a DC/DC converter, and the switching power supply is generally an AC/DC converter.
Read recommendations:
18W European standard Power Adapter
New ABS Fire Shell Gigabit ESD Protection POE Powered Adapter Power Supply 90W POE Injector
5V 20A ac dc switching power supply 100w smps for it equipment
The latest article
S series S1000 energy storage mobile power supply
2021-03-18S series S900 energy storage mobile power supply
2021-03-18New ABS Fire Shell Gigabit ESD Protection POE Powered Adapter Power Supply 90W POE Injector
2021-03-18ShenZhen Factory OEM ODM AC DC Open Frame Switching Power Supply Manufacturer
2021-03-18130W bare board power supply
2021-03-1880W bare board power supply
2021-03-1872W bare board power supply
2021-03-1872W bare board power supply
2021-03-1860W bare board power supply (54V)
2021-03-1836W Open Frame Power Supply
2021-03-1836W Open Frame Power Supply
2021-03-1830W Open Frame Power Supply
2021-03-1810W Open Frame Power Supply
2021-03-187W Open Frame Power Supply
2021-03-187W Open Frame Power Supply
2021-03-18Amplifier + power supply
2021-03-1060W single power supply
2021-03-10Amplifier + power supply
2021-03-1027W single power supply
2021-03-10Amplifier + power supply
2021-03-1030W power amplifier power supply
2021-03-10144W power amplifier power supply
2021-03-1048W desktop
2021-03-1048W desktop
2021-03-1024W U.S. regulations
2021-03-1018W U.S. regulations 18W Wall-Mounted Power Adapter
2021-03-1018W U.S. regulations18W Wall-Mounted Power Adapter
2021-03-1018W European standard Power Adapter
2021-03-1018W European standard Power Adapter
2021-03-1018W U.S. regulations18W Wall-Mounted Power Adapter
2021-03-10The latest article
2003-2004
2025-03-252004-2006
2025-03-252006-2008
2025-03-252009-2011
2025-03-252012-2014
2025-03-252014-2017
2025-03-252018-2022
2025-03-252022-2024
2025-03-252024-2025
2025-03-25What are the types of mobile phone chargers and their functions?
2022-05-21Advantages of switching power adapters
2022-05-21Five core functions that the power adapter can achieve.adapter manufacture
2022-05-20Analysis of the importance of power adapters for notebooks.adapter Processor
2022-05-20Details of switching power supply in maintenance
2022-05-19Understand the precautions of the power adapter and be an expert in electricity safety
2022-05-19This is how the EMC interference of the switching power supply is generated.adapter wholesaler
2022-05-18The relationship between the nominal voltage and current of the power adapter.power adapter price
2022-05-18Five basic functions of notebook power adapters.adapter wholesaler
2022-05-17Lightning surge immunity test method.power adapter price
2022-05-17Switching power supply ripple source and control
2022-05-16Level 6 energy efficiency standard power adapter T series
2022-05-16Children sleeping with pacifiers are prone to tooth decay
2022-05-16Six methods to deal with the heating problem of switching power supply transformer
2022-05-14The principle of flyback switching power supply
2022-05-14Types of thermal protection for power adapters.adjustable power adapter
2022-05-13Summary of common faults of LED switching power supply
2022-05-13The power transistor should be used like this in the power adapter
2022-05-124 modulation methods of switching power supply
2022-05-12Some little knowledge about switching power supply
2022-05-11Laptop Power Adapter Troubleshooting Steps
2022-05-11About
Product
Process
News
Recruitment
中文
Online consultation
Online map
中
