source:Industry News Popular:adapter release time:2022-01-27 09:16:40 Article author:sznbone
The circuit of 15V, 2A precision constant voltage/constant current output power adapter is shown in the figure. A total of 4 integrated circuits are used in the circuit: TOP214Y monolithic power adapter (IC1), PC816A linear optocoupler (IC2), adjustable precision shunt regulator TL431C (IC3), low-power dual op amp LM358 (IC4) , Including two operational amplifiers IC4a and IC4b). The circuit has the following characteristics:
(1) Use IC4b, IC3, VD5 and sampling resistors R3, R4 to form a voltage control loop; IC4a, VD6 and overcurrent detection resistor R6 form a current control loop;
(2) The voltage control loop and the current control loop work according to the principle of "logic OR gate", that is, at any time, the loop whose output is high level plays a control role;
(3) The secondary bias winding NSB is added to supply power to the control loop, and the secondary bias USB can automatically follow the change of the DC input voltage UI.
Make the power supply output voltage UO still have constant current characteristics when the output voltage UO is greatly reduced, and enter the automatic restart state only when UO≤0.8V;
(4) Use a TOP214Y single-chip power adapter to make the rated output power reach 30W;
(5) When a current control loop composed of an operational amplifier is used, the resistance value of the current detection resistor R6 can be reduced to 0.1Ω, the power consumption can be reduced to 0.4W, and the power supply efficiency can be improved;
(6) Increase the maximum value of the feedback voltage UFB to 46V. Here, a PC816A optocoupler is used, with U(BR)CEO=70V>40V.
Under normal circumstances, the voltage control loop works, and the power adapter works in the constant voltage zone. When IO is close to 2A, it enters the constant current zone, and the current control loop works at this time. The non-inverting input terminal of IC4a is connected to the current detection signal UR6, and the inverting input terminal is connected to the voltage divider voltage UFY. The voltage divider is composed of R5, R8 and TL431C. After IC4a compares UR6 with UFY, it outputs an error signal Ur2, which then becomes a current signal through VD5 and R1, which flows into the LED in the optocoupler, and then controls the duty cycle of TOP214Y, so that the output current IOH of the power supply is in the constant current region. Keep constant within. Obviously, VD5 and VD6 are equivalent to an "OR gate." If the output of the current control loop is high and the output of the voltage control loop is low, the power supply works in a constant current output state; otherwise, it works in a constant voltage output state.
Read recommendations:
New ABS Fire Shell Gigabit ESD Protection POE Powered Adapter Power Supply 90W POE Injector
Manufacturer desktop type 18w ac dc 12v switch power supply adapter 90v adaptor
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
