比较器在运放放大器的基础上强化了输入结构的精度和输出级的开关速度,所以比较器的翻转速度往往可以工作于ns级别,一般的运算放大器则望尘莫及。 晓飛飛 发表于 2025-7-9 23:29
电压比较器和运算放大器看似一样,但是有本质的区别,比较器和运放一样有同相输入端和反相输入端,但是内部 ...
那就是不能像传统运放那样恒流哦!
vb2002 发表于 2025-7-9 23:37
那就是不能像传统运放那样恒流哦!
是的,你可以这样理解,电压比较器是模拟数字混合芯片,输入级是模拟的,输出级是数字的,像逻辑电路一样,分推拉输出和开漏输出两种。当然了,非要强行把比较器当运放来用,那相当于让一个数字IO输出模拟电压信号,一般的办法是注入三角波生成PWM信号低通后得到模拟电压,线路复杂不说精度和频率响应都不能保证。 晓飛飛 发表于 2025-7-10 00:08
是的,你可以这样理解,电压比较器是模拟数字混合芯片,输入级是模拟的,输出级是数字的,像逻辑电路一样 ...
那我懂了.
我还是去学学pid可能来的实在点~ vb2002 发表于 2025-7-10 10:10
那我懂了.
我还是去学学pid可能来的实在点~
并不是所有的闭环控制系统都适合用PID,PID对于无惯性系统的控制能力非常差,你要做LED的恒流源就看看正经的光源程控电源是怎么做的,尽量使用纯硬件实现反馈环。
实在想搞高端的,可以使用照度传感器参与闭环控制,恒流调流只是手段,恒亮调亮才是最终需求。
很多半导体激光器在一个封装内安装一个发射管LD和一个接收管PD,就是为了在恒流驱动的基础上增加照度闭环修正,从这个思路试试。
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
晓飛飛 发表于 2025-7-10 11:34
并不是所有的闭环控制系统都适合用PID,PID对于无惯性系统的控制能力非常差,你要做LED的恒流源就看看正经 ...
是的,恒流并不能恒亮
运算放大器的我已经弄成功了
现在市面上的基本就是这几种
1, 直驱, 用18650供电, 随着电压降低,亮度也就慢慢降低了.
2, 恒流,让输出电流始终恒定在一个值,比如500ma . 这个恒流其实并不能恒亮,因为功率还是会随着电压的下降而下降.只是相对直驱稍微小一点.
3,升压 ,这种基本能实现恒流恒亮,目前最好的.
现在我思路是想用PID做恒流,慢慢的改进做成恒亮. 比如我需要的功率是3瓦, 18650电压4.2时,电流714ma,当电压下降到3.8v 时, 电流通过PID计算到达789ma.
这个是用软件(最省成本的方案)达到不增加硬件的最好方案了. vb2002 发表于 2025-7-10 12:36
是的,恒流并不能恒亮
运算放大器的我已经弄成功了
现在市面上的基本就是这几种
我说的你是一点都没看懂,为何一定要纠结用PID实现功能,按你后面的思路,其实就是恒功率,一次函数的事情和PID有什么关系,非要纠结就用温度传感器做温升光衰补偿更实用。如果不是计量级的仪器光源,没必要搞这么隆重。 晓飛飛 发表于 2025-7-10 13:53
我说的你是一点都没看懂,为何一定要纠结用PID实现功能,按你后面的思路,其实就是恒功率,一次函数的事 ...
我的意思是,用软件来弥补硬件. 因为硬件要增加成本
手电现在挺高端的.
有的一个驱动22mm直径.32mm直径的卖几百都是常事
一个手电4000多
要不飞哥我加你微,搞不好你做点牛逼的出来.还能小赚一笔{:4_249:} 没有亮度反馈,别谈什么恒亮了,就算激励恒定,灯珠自身还有衰减呢
电筒这玩意就跟炒鞋子,炒卡,炒娃娃一样,骗钱忽悠人套路
网老四 发表于 2025-7-10 14:23
没有亮度反馈,别谈什么恒亮了,就算激励恒定,灯珠自身还有衰减呢
电筒这玩意就跟炒鞋子,炒卡,炒娃娃一样,骗 ...
不算抄吧,正常也就几十百来块一个。
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