source:Industry News Popular:adapter release time:2021-06-09 09:43:25 Article author:sznbone
Note: The magnetic flux level of the magnetic core is selected under the conditions of minimum input voltage and maximum pulse width. It can be seen that the weak point of magnetic core saturation under high input voltage is retained. However, the pulse width required to transmit power under high voltage conditions will be narrowed accordingly, and the transformer will not saturate.
Under transient load conditions, when the power adapter is lightly loaded and working at a high input voltage, if the load needs to be increased suddenly, the control amplifier will immediately widen the driving pulse to provide additional power. As a result, the input voltage and pulse width are both maximum within a short period of time, and the transformer will saturate, which will lead to failure.
To prevent this, the following points should be considered.
(1) Design the transformer under the condition of higher voltage and maximum pulse width. This requires lower magnetic flux density and more primary turns. This has the disadvantage of reducing the efficiency of the transformer.
(2) The control circuit must be able to withstand high voltage conditions and maintain the pulse width at a safe value during transient conditions. Sometimes this is difficult to do because the response time to the current is relatively slow.
(3) The third point is to provide a double pulse current limit for the drive transistor Q1. The current-limiting circuit will determine the core saturation caused by the sudden increase in the primary current and prevent the pulse width from further increasing. This method has the fastest response time and is the recommended technique. Current-type control automatically provides this function.
The charger manufacturer Jiuqi Industrial Co., Ltd. gave a quick and practical design method for the flyback transformer. Many examples show that the results obtained with this simple method are often close to the optimal design. This method quickly provides transformer working standards for further design and evaluation of power adapters.
In this design example, the wire size, wire shape, or winding topology is not specifically specified. These are definitely basic issues to be considered. Designers should refer to Chapter 4 of Part Three, where there is a detailed discussion of these factors. It is important to just fill the effective area of the winding frame with the number of turns of the wire, but high-frequency transformers cannot do this. Due to the skin effect (see Appendix 4. B), the copper loss generated by this method can easily exceed the optimal design value by 10 times or more.
Read recommendations:
350W power amplifier power supply
ShenZhen Factory OEM ODM AC DC Open Frame Switching Power Supply Manufacturer
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
