用220V直接给单片机供电。

Tui***

你这样做产品简直就是谋财害命！做电子产品，特别是高压要把安全放在第一位！！！

liuzon***

Tui*** 发表于 2024-9-9 07:21
你这样做产品简直就是谋财害命！做电子产品，特别是高压要把安全放在第一位！！！ ...

在机箱内，5W左右的发热也还行，把热分散给几个电阻分担，就不用买昂贵的水泥电阻了。其他电路没有问题。

liuzon***

一计不成又生一计，这次采用多谐振荡器，小电流，功耗降低了，成本稍稍有点高大约5毛钱。多谐振荡器工作在非对称情况，相当于输出固定占空比的pwm。经过仔细计算参数就行。

liuzon***

liuzonggong 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 ...

明知山有虎，偏向虎山行，在降低成本的路线上战斗不息。

jm***

liuzon*** 发表于 2024-9-9 07:24
在机箱内，5W左右的发热也还行，把热分散给几个电阻分担，就不用买昂贵的水泥电阻了。其他电路没有问题。 ...

It is not just the heat, do you want to sell these globally ?
5 Watts is already ten times the international standby standard

In July 2007 California's 2005 appliance standards came into effect, limiting external power supply standby power to 0.5 watts

liuzon***

jm*** 发表于 2024-9-9 10:56
It is not just the heat, do you want to sell these globally ?
5 Watts is already ten times the int ...

These are made for the domestic electric bicycle charger, the production is very large, the profit is very thin, the daily shipment is about 100k. You have to cut down on your costs.

jm***

liuzon*** 发表于 2024-9-9 07:15
The tick-tap pulse generator you introduced（dropper-regulator part like SS540S ）is too expensive. ...

You can get 50uA Zeners like BZX38450 family, or you can use better shunt regulators with < 100uA or < 80uA minimum currents.

10-20mA is very high for an idling controller.
The STC reports have it able to run ~ 2uA @ 3.3V with RTC operating.

If you can get average < 1.5mA, you can meet the international standby power standard of < 0.5W

李***

你是怎么想的，告诉我！！！！

liuzon***

李*** 发表于 2024-9-9 11:30
你是怎么想的，告诉我！！！！

用尽量低的成本生产充电器。

liuzon***

jm*** 发表于 2024-9-9 11:26
You can get 50uA Zeners like BZX38450 family, or you can use better shunt regulators with < 100uA ...

I'm not trying to just start up only.Iwant to control directly, with out  another circuit. Do not have to run in the "idling" state.