eepty
Full Member level 2
I have a isolated switch mode power supply (SMPS) circuit. The output is good for my requirement. However, I need AC line zero crossing detection for my product. Since the DC reference is at different potential with the AC Live or Neutral, I can not use the general zero crossing detection circuit.
The only way I can think of is to make another non-isolated simple voltage drop circuit (eg. capacitor voltage divider), and use the common zero crossing detection circuit.
However, by this way, first, the circuit is not isolated. Second, it appears to me that the cost of the capacitor voltage divider circuit is wasted.
Can anyone suggest another way to do the zero crossing detection?
Thank you.
The only way I can think of is to make another non-isolated simple voltage drop circuit (eg. capacitor voltage divider), and use the common zero crossing detection circuit.
However, by this way, first, the circuit is not isolated. Second, it appears to me that the cost of the capacitor voltage divider circuit is wasted.
Can anyone suggest another way to do the zero crossing detection?
Thank you.
