Re: AW: Re: Aw: Re: AW: [EVGRAY] Re: buck plug ...

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Third time.

Hi Sven,
 
 Here is one of your schematics which will do for describing an idea for peak detection. I hope this message doesn't get truncated.
 
 The current through the freewheeling diodes can be monitored by measuring the sign of the voltage across them. By watching when the voltage (U_pos) across D3 is negative this tells that the current through D1 has stopped and the stored energy of inductor L1 is being 'discharged' or actually demagnetized. When the inductor L1 is fully demagnetized the U_pos voltage stops being negative and the capacitor C1 is fully charged. This is the time for discharging C1 by triggering the T1 SCR.
 
 A similar circuit is used for triggering the negative cycle. By doing it this way the triggering point will always happen when the charging current to the capacitors stop flowing.
 
 Regards
 Ole
 

---In [email protected], <s.friedrich@...> wrote :

 

 Hello Ole, thank you for your comments. I would like to switch to the peak first, unfortunately, the circuit works together then I could imagine if I switch later, I get back to a clean sine wave without distortion. I would like to switch the voltage almost to zero a short peak, which is possible with reactive energy. By impedance reduction, of course, I can switch later or is it now only the impedance that makes it dependent? I think that I discharge the capacitors so now when the current is in zero crossing, otherwise the energy would be reflective to the load because additional current is charged into the capacitors. Greetings Sven
 

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