Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-04-07 Hits: Popular:AG11 battery
Overcurrent protection circuit design for switching power supply
1 Commonly used overcurrent protection circuits for switching power supplies
1.1 Use current sensors for current detection
The working principle of the overcurrent detection sensor is shown in Figure 1. The secondary current of the converter obtained through the converter is converted into voltage by I/V. After the voltage is converted into DC, it is compared with the set value by the voltage comparator. If the DC voltage is greater than the set value, an identification signal is issued. . However, this kind of detection sensor is generally used to monitor the load current of the induction power supply. For this reason, the following measures need to be taken. Since when the induction power supply starts, the starting current is several times the rated value, which is much larger than the current at the end of the start. Therefore, when the current battery is simply monitored, the necessary output signal should be obtained when the induction power supply starts. It must be used The timer sets the prohibition time so that the induction power supply does not output unnecessary signals before the end of startup. After the timer expires, it switches to the predetermined monitoring state.
1.2 Start the inrush current limiting circuit
When the switching power supply is powered on, it will generate a high surge current. Therefore, a soft-start device to prevent surge current must be installed at the input end of the power supply to effectively reduce the surge current to the allowable range. The surge current is mainly caused by the charging of the filter capacitor. At the moment when the switch tube starts to conduct, the capacitor shows a low impedance to the AC. If no protective measures are taken, the surge current can approach hundreds of A.
The input of the switching power supply generally uses a capacitor rectifier filter circuit as shown in Figure 2. The filter capacitor C can be a low-frequency or high-frequency capacitor. If a low-frequency capacitor is used, a high-frequency capacitor with the same capacity needs to be connected in parallel to bear the charge and discharge current. The current limiting resistor Rsc inserted in series between the rectification and filtering in the figure is to prevent the impact of surge current. When closing, Rsc limits the charging current of capacitor C. After a period of time, when the voltage on C reaches the preset value or the voltage on capacitor C1 reaches the action voltage of relay T, Rsc is short-circuited to complete the startup. At the same time, circuits such as thyristors can also be used to short-circuit Rsc. When closing, since the thyristor is turned off, the capacitor C is charged through Rsc. After a period of time, the thyristor is triggered to conduct, thus short-circuiting the current limiting resistor Rsc.
1.3 Current limiting circuit using base drive circuit
Under normal circumstances, the base drive circuit is used to isolate the control circuit of the power supply from the switching transistor. The control circuit and the output circuit share the same ground, and the current limiting circuit can be directly connected to the output circuit. The working principle is shown in Figure 3. When the output is overloaded or short-circuited, V1 is turned on, and the voltage at both ends of R3 increases, and is inverted with the comparator. terminal reference voltage comparison. Control PWM signal on and off.
Read recommendations:
What are the characteristics of lithium iron phosphate batteries?solar energy battery storage system
Last article:no. 7 alkaline battery
Next article:lithium polymer battery
Popular recommendation
3.2v 280ah lifepo4 battery cell
2023-03-22603450 polymer battery company
2023-03-22801538 battery manufacture
2023-03-22battery for solar energy storage Processing
2023-05-103.7v 18650 battery pack
2023-03-22902030 500MAH 3.7V
2023-06-10Li-ion 18650 3200mAh 3.7V
2022-06-20Lithium-ion battery GN200
2022-07-29601248 300MAH 3.7V
2023-06-12Lithium Battery LQ-1212
2022-08-19Coin Battery CR 2354
2022-09-27521133 160mAh 3.7V
2022-07-01Lithium Battery GN4830
2022-08-19Coin Battery CR 2025
2022-09-27602535 500mAh 3.7V
2022-08-1918650 battery pack maker
2023-06-25batteries aaa
2023-06-2518650 lithium 3.7 battery
2023-06-25AAA Ni-MH batteries
2023-06-25CR2025 battery
2023-06-25Lithium-Ion Battery Thermal Management System Design
2025-08-15Energy density of ternary lithium batteries
2024-01-17Which Is Better for Tricycles: Lithium Ion Batteries or Lead Acid Batteries?
2025-02-14Lithium battery development
2022-11-15Polymer Battery Structure Optimization Design
2025-06-13What are the advantages of lithium iron phosphate batteries
2023-02-23The advantages of lithium iron phosphate battery.lifepo16 battery for solar energy storage Processin
2023-05-0848V lithium ion battery protection board
2022-12-06Lithium battery structure and voltage, capacity composition method
2023-02-08Analyze the factors affecting the life of lithium batteries
2023-02-11