三极管驱动的疑问
遇到了用一个三极管驱动 8-10个三极管的问题(不能用芯片唉),想到了两种方式,不知道那种更可靠,请讨论。图中三极管和光耦全在开关状态工作,对时间要求不高,三极管 Q2 - Q11基极电流分别控制在2mA 左右。1与2 相位不同,1的光耦输出导通后仍有点压降,有可能使Q1不能关断。
相对而言2要好些,但是要改进一下,光耦与R2交换,光耦输出加一个电阻,5V、12V换成同一个电压,看你需要多少V。 LcwSwust 发表于 2022-8-8 17:13
1与2 相位不同,1的光耦输出导通后仍有点压降,有可能使Q1不能关断。
相对而言2要好些,但是要改进一下,光 ...
您说的对。再问您一个问题,这种驱动方式,对Q2-Q11的基极电流是否存在分配不均衡,就是害怕有三极管可能无法工作在开关模式。 本帖最后由 alienmiller 于 2022-8-9 18:21 编辑
LcwSwust 发表于 2022-8-8 17:13
1与2 相位不同,1的光耦输出导通后仍有点压降,有可能使Q1不能关断。
相对而言2要好些,但是要改进一下,光 ...
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您还有什么更好的方法,打字就行了,不用画图。
光耦和Q1都用发射极输出吧,都接12V,我就是如此做的。 coody 发表于 2022-8-8 20:25
光耦和Q1都用发射极输出吧,都接12V,我就是如此做的。
先谢了,这样实际上是达林顿接法,原来想过,但一直害怕光耦的暗电流导致误触发,因此拿不准。 光耦输出之后,不需要5V电压,直接都用12V。
那个三极管用PNP管。
有上拉电阻,不用担心光耦的暗电流。
alienmiller 发表于 2022-8-8 17:56
您说的对。再问您一个问题,这种驱动方式,对Q2-Q11的基极电流是否存在分配不均衡,就是害怕有三极管可能 ...
当前Q2-Q11每个三极基极都串了电阻,不存在分配不均,不用怕。
我暂无更好的方法,就看实际情况如何了。 QuakeGod 发表于 2022-8-9 00:43
光耦输出之后,不需要5V电压,直接都用12V。
那个三极管用PNP管。
感谢回答,先做个试验。 LcwSwust 发表于 2022-8-9 12:00
当前Q2-Q11每个三极基极都串了电阻,不存在分配不均,不用怕。
我暂无更好的方法,就看实际情况如何了。 ...
麻烦您了,准备打样做个小板试试。 alienmiller 发表于 2022-8-8 21:41
先谢了,这样实际上是达林顿接法,原来想过,但一直害怕光耦的暗电流导致误触发,因此拿不准。 ...
一个下拉电阻的事。现代的光耦,暗电流小到可以忽略。 先感谢各位,根据大家的建议,准备这样试试,光耦电源那里加个跳线,看5V和12V的状态。
那个R2电阻要改一下,改成串联分压方式。
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