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| 12v DC to 110VAC pure-sine converter |
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| astroboy907:
I'm working on a college project where we need to trigger a 110VAC solenoid (rated at about ~18W). We are running solely from a 65C LiPo cell at 11.1V. I screwed up and bought a standalone 12V DC to 110VAC converter module from amazon but it outputs a square-wave output at 20kHz. We need something that will boost the voltage to the correct level - I'd use a standard automotive inverter but our project is largely weight-sensitive (will be airborne), so any reduction in mass we can accomplish is hugely beneficial. Is there a commonly used chipset that we can utilize to do a very simple power inverter? |
| Johncanfield:
Why the constraint of a 120vac solenoid? An engineering exercise? |
| Zero999:
Silly question, can't you change the solenoid for a 12V one or re-wind it? Try to avoid converting one voltage to another, especially DC to AC, whenever possible. Just use the correctly rated voltage component for the supply you have. You didn't specify the frequency, presumably 60Hz? There's no standard chipset to convert 12V to 110VAC at a mains frequency.. It's a very in-depth project and requires multiple steps. 1) DC:DC converter to boost the voltage to the peak voltage of the AC, which is 110*1.414 = 156V,. 2) H-bridge driven with a higher frequency PWM signal, modulated with a 60Hz sine wave. 3) LC filter to remove the high frequency element, leaving only 60Hz left. Each of the above is a fairly decent project in itself. The correct solution is to use a 12V solenoid in the first place. |
| Martin72:
The specs of the project will be needed…. First thoughts : Converting 12Vdc to 60 (?) hz AC... Create 60hz sinewave by e.g. DAC, feed it to a comparator for creating a modulated pwm signal, driving a power stage. Filtering this one as mentioned before with LC filter and feed it into a transformer 1:12 |
| astroboy907:
The solenoids we are looking at are rated at 50/60 Hz so that's a major constraint. We'd use a 12V solenoid but the manufacturer suggested that a 120V AC solenoid has a quicker actuation rate, and actuation rate is a driving factor for our design. I could likely swap it with a 24V DC one easily - a 12V one might be more difficult to find. At the end of the day we definitely would prefer lower actuation time over an over-complicated power system. |
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