source:Industry News Popular:adapter release time:2021-05-25 11:43:08 Article author:sznbone
The drive current loop established from P2 through R3, Q1 base-emitter junction, R1, and back through D2 is like a forward diode. The larger drive current value makes the transistor fully saturated during the entire turn-on period.
When Q1 is turned on, the collector current will increase with time, and its size is determined by the primary inductance, the converted secondary inductance L and the load.
As the current increases, the voltage across R1 and the base voltage of Q1 also increase until the Zener diode turns on.
Choose the value of R1 reasonably so that the drive current is cut off when the collector current reaches the maximum control value. At this time, the magnetic core just enters the saturation point, that is, the point S1' in the figure. Since H cannot be further increased when the clamping current is reached, the voltage across all windings must drop to zero. In the end, only a very small flyback is required to turn off Q1 and turn on Q2 and Q2 to continue to complete the work cycle. The collector limit current no longer depends on the transistor gain.
When the converted load current is lower than the magnetizing current, the diodes D5 and D6 connected to the collector provide a path for the reverse current. These two diodes work in a cross-connected manner. For example, when Q1 is turned off, the magnetizing current will quickly make the collector of Q1 positive. At the same time, the collector of Q2 quickly becomes negative until D6 is turned on. The dislocation effect provided by D6 makes the collector voltage of Q1 twice of Vcc. In order to reduce the shadow of leakage inductance, P1 and P3 should be wound with double strands.
In order to reduce radio frequency interference and secondary side breakdown stress, a buffer circuit is required in addition to D5 and D6.
In order to ensure a good switching effect, sufficient regenerative feedback is required, and P2 in the circuit shown should provide a driving voltage of at least 4 volts.
Read recommendations:
Customize 90 - 264Vac Input To 54V 2.77A Output Constant Voltage Ac To Dc Power Supply
How does the power adapter get smaller and smaller?wall charger manufacture
Switching regulated power adapter with extremely wide input voltage range
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
