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| DC to MAINS Inverter experts? |
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| Jester:
This is a pretty vague question, here goes...... I was told that some (perhaps most) of the newer 120V pure sine wave inverters have load detection schemes that basically keep the inverter output in a low power state disabled state whenever no load is detected by the inverter. In this state the inverter "blips" it's output every so often looking for a load and when a load is detected the inverter then activates the output stage until the load gets switched off. Does this sound correct and if so does anyone have any insight as to how often the "blips" occur, thresholds etc? |
| Bratster:
in my experience that's not normally something that's on by default or even universally supported, generally the inverter is continuously outputting. But that is definitely a fairly common option. Usually goes under the name of power save or search mode, something along those lines. especially on the large low frequency transformer style of inverter because their idle current is so high. I think it's less common in the high frequency style of inverter because their idle current can be very low. As far as what it actually is, usually it would be one or two complete cycles of AC, and they could be sent every 1 to 10 seconds depending on the inverter. The nicer ones are configurable as to how often they should search for a load and what the minimum load should be. I'm no expert, but I have installed a handful of low frequency and high frequency inverters with and without that option. Sent from my Pixel 2 XL using Tapatalk |
| NiHaoMike:
A better way it could be done is to send a high frequency pulse and measure the return signal, specifically looking for a significant change as would be caused by a switch changing state. |
| SparkyFX:
There are inverters that require a minimum load or otherwise go out of spec (output voltage exceeds nominal output), also some thyristor designs require a method to switch these thyristors off, those might fail without an actual load. The alternative would be to include a dummy load in the design and constantly waste energy to it. But those are kind of old designs, might be that these things are outdated. So regarding the question it depends on the application how often you need to try to detect a load. Once per sine wave might be a good start? Not so often that you go out of spec, but often enough to reliably start operation. |
| coromonadalix:
Gonna sound stupid, what is the gain to have a sleep function, or low power and still running, you know you have a current draw / consumption to make it run A simple power off is enough ??? you dont use it kill it ?? |
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