用220V直接给单片机供电。

liuzon***

jm*** 发表于 2024-9-9 13:29
Be sure to tell the operator of this domestic electric bicycle charger, that you have decided he  ...

His charger is 1000w, and the whole charger I designed doesn't consume much power. It's much more efficient than the original transformer. I will switched to the main power, here 6 resistor  only consumes 5 mA,Power is less than 1 watt.

Tui***

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

生产充电器？移动的？如果是这样，就更不能使用非隔离式降压方案，很容易出安全问题，安全隐患特别大。你能保证每一个元器件不被短路？断路还好，要是短路了呢？如果是自己搞研究可以，但真的不建议生产产品投放市场！

jm***

liuzon*** 发表于 2024-9-9 14:41
His charger is 1000w, and the whole charger I designed doesn't consume much power. It's much more  ...

I will switched to the main power, here 6 resistor only consumes 5 mA,Power is less than 1 watt.

Switch to pulsed DC  / full wave rectified mains does lower the power, but Spice shows it only lowers 3.6 watts to 2.7 watts (~75%)  for the same 10.5mA average load current.

That is why lowering the MCU current is so important.

liuzon***

Tui*** 发表于 2024-9-9 22:20
生产充电器？移动的？如果是这样，就更不能使用非隔离式降压方案，很容易出安全问题，安全隐患特别大。你 ...

任何低压电器总有热端和冷端，我这是在热端的。

liuzon***

jm*** 发表于 2024-9-10 07:54
Switch to pulsed DC  / full wave rectified mains does lower the power, but Spice shows it only l ...

对啊，电流的平方根热量正相关，电流降低一半，热量降低到四分之一。stc官方的数据是10ma。

hai***

都卷到这种程度了吗？我要是按你这样做，利润起码翻三倍

jm***

,Liuzonggong published on 2024-9-10 09:33
Yes, the square root of the current is positively correlated with the heat. If the current is reduced by half, the heat will be reduced to a quarter. The official data of STC is 10ma . ...

10mA can change with MHz.
STC8H series STC gives Inor = 1.49mA typ at 6MHz, and Iidle = 0.88mA at 6MHz
You also need to measure the Idd profile during startup , as that is not defined in the data sheet.


Other 50uA Iz operating zeners, to save energy on mains-dropper designs, are MMSZ4690 (5v6) and MMSZ4688(4v7) in SOD123 packages.


If you really do need 10mA and above, to power a MCU, there are pulsed mains dropper regulators like DK5030, or EC5230, which give inductor-less 5V at 30mA




These parts have 650V MOSFET and LDO, and turn ON the mosfet for AC between 8-45V then disable for the peak, and turn on again when AC drops 45-8V
VDD has a ripple supply,   6.5-7.5V and VOUT is a regulated DC

liuzon***

hai*** 发表于 2024-9-10 09:39
都卷到这种程度了吗？我要是按你这样做，利润起码翻三倍

看来你的利润厚啊，电动车充电器，出货量大，利润薄。只有一两块利润。

liuzon***

jm*** 发表于 2024-9-10 10:20
10mA can change with MHz.
STC8H series STC gives Inor = 1.49mA typ at 6MHz, and Iidle = 0.88mA at  ...

The last side approach is good，I once wanted to use a db 3 to drive a Controllable silicon diode, adjust the Angle, as EC4230,design all parameter ，Let it communicate at under 20V  ,Controllable silicon diode, i have looked at it on www web, the  Controllable silicon diode  is  expensive . This ec4230 may be more expensive.DK5303 Is a power management chip. To be charged, it's much more expensive too .EC4230 is a very good idear.I will ask the agency.

liuzon***

小*** 发表于 2024-9-7 16:30
RC阻容降压吧，电路是是不是缺整流部分啊

从整流后取电。