It depends on your actual needs. Lithium batteries are divided into capacity type and power type. Lithium iron phosphate is basically a power type, with a 1C charge and discharge cycle life of up to 2,000 times. A single battery will not burn when overcharged to 30V and will not explode if punctured. The operating temperature range is -20°C to +75°C. In comparison, lithium polymer batteries are much more. delicate. Lithium polymer batteries are also divided into two types: power type and capacity type. Needless to say, the ability type has great ability. The discharge rate of power type is not lower than that of lithium iron phosphate. is not inferior to that of lithium iron phosphate, but the price is much more expensive, the price is also low, and the quality is not good enough. It's easy to swellr when charging and discharging with high current, so it still remains. depends on your actual needs before choosing the suitable lithium battery. Personally, I prefer lithium polymer batteries.
This can be done, but it is more inconvenient and not recommended.
It requires a Mos tube, a large inductor, a MOS driver circuit and a 34063 circuit.
There are many 34063+NMOS boost circuits, so I won't list them here . The reasons for failure are usually:
1 There is no current expansion, ie. no high quality NMOS is used< /p>
2. If the inductance is too large, it may be saturated. There are many calculators online. Just calculate it well and don't make it too big (the minimum value). is about 5 times better)
3, NMOS has no discharge circuit and is constantly turned off.
4. Ipk is not connected (but low voltage Ipk requires concspecial eption), preferably a tapped inductor
5. The feedback is affected by the inductance and oscillates
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