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| | | | | | | 芯片型号是MID400, 规格书见附件。还没在电路上试,不过看规格书介绍是可以的 |
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| | | | | | | 从规格书看来,没问题。
以下来自规格书,规格书见刚才的回复。
The MID400 is an optically isolated AC line−to−logic interface
device. It is packaged in an 8−lead plastic DIP. The AC line voltage is
monitored by two back−to−back GaAs LED diodes in series with an
external resistor. A high gain detector circuit senses the LED current
and drives the output gate to a logic low condition.
The MID400 has been designed solely for the use as an AC line
monitor. It is recommended for use in any AC−to−DC control
application where excellent optical isolation, solid state reliability,
TTL compatibility, small size, low power, and low frequency
operations are required.
• Direct Operation from any Line Voltage with the Use of an External
Resistor
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| | | | | | | | | 规格书中提到该光耦适用于低频率,但没有说具体适用的低频率范围,一般AC115V,400Hz比较常见。
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| | | | | | | | | | | 400Hz, 有点悬,规格书有turn on/off时间
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| | | | | | | | | | | | | | | | | 需要国产化 ,而且还要稳定可靠,不能误检测,我看这块很多是先整流滤波后再用单片机检测。
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| | | | | 为什么不把交流通过整流桥整流滤波之后再接到单极光耦的原边呢?这样的话就会存在上述问题了啊 |
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| | | | | | | 整流滤波后成本会高一点,电压也被抬升了一些,但是也可以的。再简单一点,用阻容降压给单片机供电,单片机的IO口直接检测过零点,再对应做出逻辑判断和信号输出 |
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