source:Industry News Popular:adapter release time:2021-06-18 09:25:38 Article author:sznbone
The resistors R1 and R2 are usually the discharge resistors of the energy storage capacitors C1 and C2. After they are switched on, they cause current to flow into the capacitor C3, and the capacitor C4 of the auxiliary charger will discharge at this time.
The voltage of C3 will increase until both ends of the diac reach the trigger voltage. The bidirectional two-pole thyristor will trigger and transfer part of the charge from C3 to C4, and the size of the transferred current is limited by the resistance R3.
Choose the appropriate capacitors C3, C4 and the voltage value of the bipolar thyristor, so that the required auxiliary charger voltage is gradually formed at both ends of C, and the converter starts to work through a normal soft start.
Again, through D5 and additional winding positive feedback, the main transformer provides an auxiliary charger.
As C4 is further charged and the voltage rises, the bipolar thyristor turns off. Because of the clamping action of ZD1 on C3, the voltage across the bipolar thyristor no longer reaches the trigger value.
This circuit has such advantages:
During the turn-on transient, a large current is provided, and there will be no excessive loss on the resistors R1 and R2. In the case that the first pulse of the converter fails to start (this situation rarely occurs), once C4 is discharged and C3 is recharged to the turn-on voltage of the bipolar thyristor, the start action will be repeated.
The choice of bipolar thyristor is very important. It must be able to conduct the required conduction current, and the conduction voltage should be less than (V1-Vstart) and greater than (V1-V2) (where V1 is the clamping voltage of ZD1, Vstart is the starting voltage of the control circuit, and V2 is the converter C4 voltage during operation); otherwise, the lock will occur after the first pulse. It is feasible to replace the bidirectional triode with a small SCR and an appropriate gate drive circuit.
Read recommendations:
60W power amplifier power supply
AC-DC Power Module 10W High Power Switching Power Supply Board 90V-264V
Can the power adapter be used as a charger?
Have you ever seen a power adapter that does not invade water or fire?
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
