Timeline for boost converter for ultra low power application
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 12, 2018 at 9:41 | comment | added | Andy aka | @A.Z not5 really but if you have a simulator you can do this yourself. Sims are free these days like micro-cap student edition so it wouldn't take too much setting up. If you do this you can post a new question if the sim isn't giving you the results and get more front-line help from other folk as a spin-off. | |
| Aug 12, 2018 at 8:58 | comment | added | A.Z | can you please give me a simulation about what you say? | |
| Jul 29, 2018 at 11:33 | comment | added | Andy aka | @A.Z you forget the capacitor at the input to the circuit. It'll accumulate energy delivered at low current levels and sustain 30 mA (or so) through the inductor for short periods of time. The inductor peak current is >> than your fuel cell average current but that is not what is important. I = C dv/dt and at 0.5 mA and 1 uF the voltage rise is 500 V/sec. This is countered by the pulse of inductor current (say 30 mA for 1 us) and reduces the capacitor voltage by 30 mV for each 1 us. You just have to ensure your load power is no more than about 50% of input power. | |
| Jul 29, 2018 at 11:04 | comment | added | A.Z | I appreciate your response. I don't agree with ur opinion because : the peak current in Inductor ( Iin ) will obey this formula in every boost converter [ Ipeak=(VinD)/(fsL) ]. so we can use very low Duty Cycle (for example 1%) to reach low quiescent current (7 uA in datasheet) but we cant Power manage with 1% Duty Cycle ... if I increase Duty Cycle, I will sink more current from my Fuel cell ( i can't do more than 300 uA like I said before ) I think quiescent current report in an IC data sheet is a trick. it cant Power manage in this mode ... | |
| Jul 28, 2018 at 12:44 | history | answered | Andy aka | CC BY-SA 4.0 |