Hopefully? Another 48vdc-240vac Toriod Inverter build.

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tinyt Guru Joined: 12/11/2017 Location: United States Posts: 438	Posted: 12:54pm 05 Jun 2023         KeepIS said   For anyone interested in the Precision Peak detector: I have changed the cap from 2.2 to 4.7uF. A few tweaks to the inverter have seen the startup time of some machinery reduced. The Cap change allows me to see the current reached correctly, which in this case is almost Full scale deflection of the Meter @ 585A, just 15A shy of the 600A limit. For those who think this circuit is not accurate, it is! Right across the full scale range of  the meter. These current Sensors are low cost and have a 100% repeatable response, this circuit only needs one or two cycles of 100Hz current to charge the Cap to the Peak instantaneous DC input.   I'm comparing the Meter reading with a DSO capture from the Sensor output, the output is a permanent socket mounted on the Inverter control panel. I no longer need to use the DSO for Peak input checks, this meter is that good. Of course the DSO is still used for waveform analysis. For the Meter, the DC current waveform is always going to be a 100Hz DC sinewave representation of the FET current drawn to produce 50Hz AC when driving the Toriod Primary.   Revised circuit: The Meter I used is 50uA FSD, but almost any meter will work, if the adjustment range is limited, a change to the 500 ohm 10 turn preset or the 1K connected to it will fix that. ... . Nice! Can I have permission to copy your circuit? Do yo have a part number for the Hall effect sensor? Thanks.