Difference between revisions of "Bat boost"
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| + | ==how does volume changed with L and Isat== | ||
| + | [http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/indtor.html Toroid inductance] | ||
| + | [http://powerelectronics.com/mag/power_inductor_core_material/ Core Material] | ||
| + | * R increases with N, but L increase with N^2 | ||
| + | * L increases with A, eg A~radius^2, but Res ~ radius | ||
| + | * assume saturation depends on B (eg Bmax), thus there is a Imax limit | ||
| + | * But increasing A, increases L at A^2, but R linearly. Volume increases ~linearly w/A | ||
| + | ==multiphase== | ||
| + | http://powerelectronics.com/power_management/regulator_ics/multiphase-converter-ic-power-requirements-0101/ | ||
| + | ==efficiency== | ||
| + | [http://powerelectronics.com/power_management/boost_converter_efficiency_calculations-809/index.html] | ||
| + | |||
| + | ==split pi== | ||
| + | http://en.wikipedia.org/wiki/Split-pi | ||
| + | |||
| + | =old= | ||
*Assume 9V is Vbat min (probably less due to ESR). | *Assume 9V is Vbat min (probably less due to ESR). | ||
*Also assuming peak L charge time is 1uS | *Also assuming peak L charge time is 1uS | ||
Latest revision as of 15:55, 11 November 2009
how does volume changed with L and Isat
Toroid inductance Core Material
- R increases with N, but L increase with N^2
- L increases with A, eg A~radius^2, but Res ~ radius
- assume saturation depends on B (eg Bmax), thus there is a Imax limit
- But increasing A, increases L at A^2, but R linearly. Volume increases ~linearly w/A
multiphase
efficiency
split pi
http://en.wikipedia.org/wiki/Split-pi
old
- Assume 9V is Vbat min (probably less due to ESR).
- Also assuming peak L charge time is 1uS
- Single phase requires 70 amps
- Lmax = 9/70 = 0.13uH
- 2 phase, Lmax = 9/35 = 0.26uH
- 4 phase, Lmax = 0.514uH (Imax=17.4)
