Difference between revisions of "Power Converters"
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** L/R fall-off time: 0.8e-9/20e-6 = 40 us. |
** L/R fall-off time: 0.8e-9/20e-6 = 40 us. |
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** resistance 'seen' on primary coil: 20e-6*100**2 = 0.2 Ohm. |
** resistance 'seen' on primary coil: 20e-6*100**2 = 0.2 Ohm. |
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| + | * secondary coil, stainless steel ([resistivity = 690 nOhm m, [http://chemistry.about.com/od/moleculescompounds/a/Table-Of-Electrical-Resistivity-And-Conductivity.htm chemistry.about.com]) |
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| + | ** resistance: 690e-9 * 3.14*10e-3 / (1e-3*100e-3) = 216.66 u Ohm |
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| + | ** L/R fall off time: 0.8e-9/ 217 u Ohm = 3.7 us |
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| + | ** resistance 'seen' on primary coil: 217 *100**2 = 2.2 Ohm, so with 200 primary turns, will be 8.7 Ohm. |
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=Misc= |
=Misc= |
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Revision as of 12:40, 5 July 2015
Main MOSFETs
P channel
- FDS9953A, digi-key FDS9953ACT-ND, max 2.9 A cont, typ 2.5/max 3.4 nC, <23 ns on/off time (fairchild package drawing)
N Channnel
- SSM6N58NU, digi-key SSM6N58NULFCT-ND, max 4A continuous, 1.8nC gate charge, 29/9 ns on/off time, dual, EUR 0.34 (25 stuks)
Drive of main mosfets
Comparators
- MAX9012EUA+ digi-key MAX9012EUA+-ND: typ 20/30 mA short, prop delay 9ns, rise/fall 3 ns, 2.2 EUR (dual)
- 584-AD8564ARUZ-R, mouse, short current??? in tabel niet meer dan +/- 10 mA, in text 'can deliver up to 40 mA per channel'. Rest wel goed (en quad).
- LMV7219M7, Farnell 1468946: typ 65 mA short, rise/fall time 1.3ns, prop delay typ 7, max 19 ns, EUR 2.96/stuk (1.6 voor 50)
- NCX2200, farnell 2164804: typ 68 mA short, 10 ns transition time, ... 800ns prop delay...
MOSFETs
- N/P: DMG1029SV, digi-key, mouser: typ 0.3 nC, 15 ns, 6 Ohm, EUR 0.43
- N/P: DMC2400UV-7, digikey, 0.5 nC, Vgs(th)=0.9V, 0.48 Ohm (Vgs=4.5V), EUR 0.25, SOT563
- N/P: DMG1016UDW-7, digikey, typ 0.74 nC (740nC datasheet), Vgs(th)=1V , RdsON=0.5 Ohm (Vgs=4.5V), SOT363 (pitch 0.65)
Other Components
Inductive Heating Power Transfer
Coils
Indactance calculator, or simpler, this one gives different/wrong? results
- primary coil: length=110mm, diameter=11mm, N=100 => 9.7 uH
- secondary coil: length=100mm, diameter=10mm, 1mm thick brass:
- inductance=8.0 uH/100^2=0.80nH (8.0uH is inductance for 10mm diameter coil)
- resistance: 65e-9 [Ohm m] * 3.14*5e-3 / (1e-3*100e-3) = 20 u Ohm
- L/R fall-off time: 0.8e-9/20e-6 = 40 us.
- resistance 'seen' on primary coil: 20e-6*100**2 = 0.2 Ohm.
- secondary coil, stainless steel ([resistivity = 690 nOhm m, chemistry.about.com)
- resistance: 690e-9 * 3.14*10e-3 / (1e-3*100e-3) = 216.66 u Ohm
- L/R fall off time: 0.8e-9/ 217 u Ohm = 3.7 us
- resistance 'seen' on primary coil: 217 *100**2 = 2.2 Ohm, so with 200 primary turns, will be 8.7 Ohm.
Misc
- FT234XD-T, usb<->rs232 etc converter, 2 EUR, heeft geen cristal nodig (?)
- Layouts: Solderrm-d
