用220V直接给单片机供电。

李***

liuzon*** 发表于 2024-9-9 11:49
用尽量低的成本生产充电器。

太省了，不用考虑售后？

Debu***

不建议生产劣质产品

晓***

liuzon*** 发表于 2024-9-9 10:54
一计不成又生一计，这次才用多谐振荡器，小电流，功耗降低了，成本稍稍有点高大约5毛钱。多谐振荡器工作在 ...

这个电路要是不炸，我给你发特别创新奖

liuzon***

晓*** 发表于 2024-9-9 12:19
这个电路要是不炸，我给你发特别创新奖

讲讲，为啥会炸？我觉得还行啊。

autop***

串联电容降压，小家电非常常见。

280

autop***

串联电容降压，小家电非常常见。

280

liuzon***

autop*** 发表于 2024-9-9 13:15
串联电容降压，小家电非常常见。

280

要是直接从220交流取电用容阻降压法很好用。我想从331，取电，这样不用滤波整流了。
还有一个，电容太贵了。5毛钱一个呢。

jm***

liuzon*** 发表于 2024-9-9 10:54
一计不成又生一计，这次才用多谐振荡器，小电流，功耗降低了，成本稍稍有点高大约5毛钱。多谐振荡器工作在 ...

How does that reduce power consumption ?

If your pulse 10x the current for 10% of the time, your RMS current means the heat loss is the exactly the same 3.3 Watts per 10mA of load. (ignoring additional switching losses)

It is a good idea to include a transistor as you can regulate the base of that for the actual power usage of the MCU and do not need to always waste 3.3 Watts/10mA
ie use the MCU to switch your Q3, once the circuit has started.

jm***

liuzon*** 发表于 2024-9-9 11:09
These are made for the domestic electric bicycle charger, the production is very large, the profit ...

Be sure to tell the operator of this domestic electric bicycle charger, that you have decided he should end up paying far more in electricity costs over the life of this product, than you ever hoped to save in jellybean components !
Will he thank you ?

liuzon***

jm*** 发表于 2024-9-9 13:20
How does that reduce power consumption ?

If your pulse 10x the current for 10% of the time, your ...

You are right, the heat is not reduced. Still so much.After much thinking, I finaly like the first solution，it is simple, lowest cost.I also thought of using six Schottky voltage diodes in series, but the heat is not reduced. Or don't use it.