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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:2024-03-26 Hits: Popular:AG11 battery
USB powered 18500 battery switch mode charger circuit design
Charge NiMH batteries via USB
Figure 1. USB-powered single-cell NiMH battery switch-mode charger
Although Li+ batteries have ostensibly taken over the portable world, NiMH batteries have not been completely abandoned. Surprisingly, although there is still a large gap in energy per unit weight, its energy per unit volume is only about 15% lower than that of Li+ batteries. The biggest disadvantage of NiMH batteries is the high self-discharge rate. Hybrid NiMH batteries have solved this problem to a great extent. For example, SANYO® Eneloop® batteries can still retain 85% of their power after one year of static use. The appeal of NiMH batteries lies in their low cost, high safety, and ease of user replacement. At least standard batteries have these advantages.
The portable device shown in Figure 1 is powered by a AA NiMH battery and is charged via USB. The charger switching frequency is approximately 150kHz and the battery charging current is 1.1A (typical AA NiMH battery at approximately 0.5°C). Since the buck converter converts 5V, 500mA into 1.5V, 1.1A when charging the battery, the current supplied to the battery by the circuit (1.1A) is greater than the current obtained from the USB interface (500mA). It should be noted that since charging termination cannot be correctly determined at low charging rates, only 500mA or higher power ports can be used for charging. So, when enumeration determines that only 100mA is available, charging should not be activated. The system stops charging by turning off Q2 on TMR, leaving the timer resistor floating.
Another particularly useful function of this charger is to detect the battery impedance to determine whether the connected alkaline battery or a faulty battery is connected. Charging will be prohibited when this condition is detected. This allows users to insert alkaline batteries in an emergency without worrying about accidental charging.
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