Help on this zero-volt triggered(switched) circuit

[soidal]

Hello,

This is my first post. I am a novice in electronics and would appreciate your expert help.

I am trying to make a circuit that reverses output polarity whenever 0v from the input side is encountered.

The input voltage, which will drive the output device but also acts as a trigger voltage, will be a positive DC and this DC voltage will flutuate in between +50v(peak) and 0v. And my goal is to have this fluctuating DC voltage to "trigger" the reversal of polarity to the output device.

This reversal should occur whenever the input voltage falls down to zero (or very near zero) and the reversal will be continuosly alternating i.e. if the current output polarity is positive-negative then the next time 0v is encountered, will become negative-positive and the next time, positive-negative and the next time negative-positive and so on. And snubber circuit may not be necessary since the voltage at the time of polarity reversal will be zero(or near zero).

What simple IC or circuit or relay or triac or other devices this novice is ignorant of will do this? (The max wattage this circuit should handle is about 400w. RMS will be about 200w)

I would so much appreciate if you could help me building this inexpensive but reliable circuit.

Thank you for your time.

 

[NoTime]

Welcome to PF.

Perhaps you could tell up just what your power supply is, what you are trying to run with it and just what it is that this circuit is supposed to do.

Depending on just what it is that you are trying to accomplish, you might be able to use a Schmitt trigger IC, an Op-amp or a transistor for zero detection.

I have no idea where you going with the positive-negative/negative-positive thing.

In general we won't design a circuit for you, but we may be able to tell you something about what you need to know to do what you want.

 

[ravenprp]

Hi there,

Thank you for reaching out for help with your circuit. It sounds like you are trying to create a zero-volt triggered or switched circuit that will reverse the output polarity whenever 0v is encountered on the input side. This can be achieved using a few different components and techniques.

One option is to use a comparator IC, such as the LM339, which can compare the input voltage to a reference voltage and provide a digital output based on that comparison. You can set the reference voltage to 0v and use the output of the comparator to trigger a relay or transistor circuit that will reverse the polarity of the output device. This method may require some additional circuitry to handle the switching of higher wattages, so be sure to research and understand the components you will be using.

Another option is to use a microcontroller, such as an Arduino, to monitor the input voltage and trigger the polarity reversal. This would allow for more flexibility and control over the circuit, but may also require more programming knowledge and additional components.

In terms of handling 400w, you may need to use a relay or triac to switch the high power load. Be sure to choose components that can handle the voltage and current requirements of your circuit.

I hope this helps get you started in the right direction. Good luck with your project!