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
Analysis of the effect of short circuit protection circuit on inverter
In the design and manufacturing process of the inverter, over-current short-circuit protection is a very important link, which largely determines the safety of the inverter in actual use. If the over-current short-circuit protection circuit fails, then the inverter will The inverter will most likely burn out, so the short-circuit protection circuit plays a great role in the inverter.
If you want to quickly understand the overcurrent short-circuit protection circuit in the inverter, you must first conduct a comprehensive analysis of the load characteristics. Most of the loads in real life are impact loads, such as incandescent light bulbs. The resistance when cold is much lower than when it is lit. For rectifier loads such as computers and televisions, since the input alternating current needs to be rectified, a A relatively large capacitor is used for filtering, so the inrush current is relatively large. There are also inductive loads on motors such as refrigerators. The motor also needs electricity to generate relatively large torque from standstill to normal rotation, so the starting current is also relatively large.
When the rated output power is less than the starting power, it cannot be started. Of course, this only refers to the situation where the inverter can only set a long-term working output power. At this time, the inverter needs to be equipped according to the starting power, which is obviously a waste. In practice, when we design an overcurrent short-circuit protection circuit, we will design two protection points, rated power and peak power. Generally, the peak power is set to 2-3 times the rated power. In terms of time, the rated power will not be protected after working for a long time, and the peak power will generally only last for a few seconds before being protected. Let’s take the designed overcurrent short-circuit protection circuit as an example to explain:
R5 is the high-voltage current sampling resistor at the source of the full-bridge high-voltage inverter MOS tube. We can understand that the size of the high-voltage current basically determines the size of the output power, so we use R5 to detect the size of the high-voltage current. The two comparator units of LM339 in the picture are used for over-current and short-circuit detection respectively.
Let’s first look at the overcurrent protection circuit composed of IC3D and its peripheral components. Pin 8 of IC3D sets a reference voltage, and its value is determined by the voltage division of R33, VR4, R56, and R54. U8=5*(R33+VR4)/(R33 +VR4+R56+R54). When the voltage on R5 exceeds the voltage of pin 8 after being delayed by R24 and C17, pin 14 outputs a high level and is isolated to pin 5 of IC3B through D7. Pin 4 also serves as battery under-voltage protection. Normally, the voltage of pin 5 is lower than pin 4. After overcurrent, the voltage of pin 5 is higher than pin 4. Pin 2 outputs a high level to control the high-voltage MOS of the subsequent stage to turn off. Of course, it can also control the front stage. level MOS is turned off together. The function of D8 is to lock pin 2 to high level with positive feedback after overcurrent, short circuit or battery undervoltage.
The short-circuit protection point should be designed according to parameters such as the ID of the MOS tube, the safe area and the loop stray resistance. Generally speaking, it is relatively safe if the current is within ID and the action time is within 30 microseconds. Let’s look at the short-circuit protection circuit composed of IC3C. The principle is similar to that of over-current protection, except that the delay time is shorter. The capacity of C19 is very small, and the speed of LM339 is very fast. The short-circuit protection can be turned off within a few microseconds. , effectively protecting the safety of high-voltage MOS tubes.
Read recommendations:
Analysis of common problems of lithium iron phosphate material in battery processing
Last article:lithium 3400mah 3.7v 18650 battery
Popular recommendation
601848 battery direct sales
2023-03-2232700 battery direct sales
2023-03-22802540 battery company
2023-03-22Battery Packs direct sales
2023-05-091.5V rechargeable battery
2023-03-22Carpet game signs
2022-09-22LR03
2022-07-2318650 2400mAh 3.7V
2022-06-20902030 500mAh 3.7V
2022-06-27Lithium Battery LQ12-200
2022-08-19L822 32A/29A
2022-10-09603450 1200mAh 3.7V
2022-07-01551235 180mAh 3.7V
2022-08-19LR14
2022-07-01L1325 4LR44
2022-10-0918650 battery pack Product
2023-06-25Nickel Hydride No. 5
2023-06-2518650 battery 3.7v 2000mah
2023-06-2518650 battery pack 12v
2023-06-25r03 battery
2023-06-25Good Low-temperature Performance of Lithium-ion Batteries
2024-12-28LR754 battery.New smart materials could open new areas of research
2023-11-30Selection of Single - Use Lithium Batteries
2025-04-16Capacity of Cylindrical Lithium Batteries
2025-04-17Lithium battery application common sense
2024-04-10Future Development of Lithium Battery Diaphragm Materials
2022-11-10Lithium battery manufacturers introduce three categories of lithium batteries!lifepo4 lithium ion ba
2023-03-11What is the difference between 18650 batteries and soft pack lithium batteries?CR1625 battery
2023-06-20How to charge lithium batteries for new batteries.lithium polymer battery 10000mah
2023-07-1818650 battery 4800mah.What are the application fields of polymer lithium batteries
2023-10-14