source:Industry News Popular:adapter release time:2021-06-03 10:38:57 Article author:sznbone
In the current-mode control circuit of the power adapter, slope compensation is very common, and there are many ways of compensation. This article introduces how the slope compensation technology is implemented and how it affects the performance of the current mode control switching regulator. Then, the article continues to incorporate examples of commercial voltage controllers from major power module manufacturers in this technology.
The power adapter is a kind of power supply that uses modern power electronic technology to control the turn-on and turn-off time ratio of the switching transistor to maintain a stable output voltage. Compared with linear power supplies, it has high efficiency, high power density, and can realize and output. The electrical isolation of the human power grid and other advantages are known as the off-efficiency energy-saving power supply. At present, the power adapter has been applied to various fields, especially in the occasion of high-power applications, the power adapter has obvious advantages.
The power adapter is generally composed of a pulse width control (PWM) IC, a power switch tube, a rectifier diode, and an LC filter circuit. In the small and medium power power adapter, the power switch tube can be integrated in the PWM control IC. The power adapter is divided into voltage mode and current mode according to the feedback mode. The current mode power adapter has been rapidly developed and widely used due to its outstanding advantages. But the structure of the current mode determines that it has two shortcomings: constant peak current rather than constant average current caused by open loop instability of the system: open loop instability of the system when the duty cycle is greater than 50%.
This article aims to analyze the shortcomings and improvements of the traditional current mode in principle, and then analyze a practical slope compensation circuit.
2. Principle analysis of current mode
The scanner power adapter can have many structures, but the principles are basically similar. Figure 1 is a schematic diagram of the current mode step-down chopper fg (Buck) power adapter. The main difference between it and the voltage mode is the addition of current sampling resistor R3 and current amplifier IA. The resistance of R3 is generally small to avoid large power consumption. The power tube Ql is turned on and maintained for a period of Ton at the beginning of each cycle, and the filter capacitor C is connected to the filter capacitor C through the filter inductor Lo. Charging and supplying current to the load at the same time. At this time, the rate of change of the current on Lo with time is
Read recommendations:
AC-DC Power Module 10W High Power Switching Power Supply Board 90V-264V
12W 12V UL FCC CE certificates 12V wall mount power adapter
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
What 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
2022-05-119 classification methods of switching power supply
2022-05-10Advantages and disadvantages of switching power supply current mode
2022-05-10Advantages and disadvantages of switching power supply current mode
2022-05-099 classification methods of switching power supply
2022-05-09Characteristics and working methods of PFC regulated switching power supply
2022-05-07Six maintenance rules for drone lithium batteries.manual charger power adapter
2022-05-07Reasons for Inrush Current in Switching Power Supply Design.adjustable power adapter
2022-05-06The optimal solution of drone power management solution!12w acdc power adapter
2022-05-06Characteristics of Switching Power Adapter Transient Loads
2022-05-05About
Product
Process
News
Recruitment
中文
Online consultation
Online map
中
