Easy peasy
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Yesterday, 21:12Easy peasy replied to a thread Different FETs for Top and Bottom FET in synchronous Buck converter in Power ElectronicsShort answer = yes3 replies | 128 view(s) -
Yesterday, 21:11as Klaus says, the above is a very bad idea, get some help from some one who has some experience in power electronics ...6 replies | 184 view(s)
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Yesterday, 03:35Easy peasy replied to a thread Adding an LC post filter can make an SMPS unstable....use RC filter instead? in Power ElectronicsYes, put damped C's on your power supply, and damping in the control loops, 3rdly specify max capacitance load, it is generally only a problem...7 replies | 248 view(s)
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Yesterday, 02:06A variac and an isolating transformer ...3 replies | 223 view(s)
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Yesterday, 02:05at start up with no load these simple bang-bang reg's can go over volts and sit there for a long time until the leakage current on the electro...6 replies | 184 view(s)
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25th February 2020, 04:53Easy peasy replied to a thread Adding an LC post filter can make an SMPS unstable....use RC filter instead? in Power ElectronicsIf you load a converter with a less than critically damped LC stage, where the Fo is close to or less than the crossover freq of the converter - ...7 replies | 248 view(s)
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25th February 2020, 04:48The 1k should be in the Drain of Q5 ... else it affects the gate drive volts of Q5 ...5 replies | 153 view(s)
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25th February 2020, 04:44Easy peasy replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power Electronicsjust for clarity, Tan-delta is used to calc losses, capacitor VA x tan-delta = watts i.e. 2Vrms x 2A rms = 4 VA in the cap x ...11 replies | 402 view(s)
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24th February 2020, 07:17Easy peasy replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power Electronicsthe resistance of the cap at 750kHz ( it will be higher than ESR min at resonance ) will add vectorially to the XL at 750kHz to give a Z some...11 replies | 402 view(s)
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24th February 2020, 04:22Easy peasy replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power Electronicsjust a note, most electro's are self resonant from 50 - 100kHz, i.e. above this they are inductors, they provide bulk storage for low...11 replies | 402 view(s)
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24th February 2020, 04:19where are you buying for control IC's from ... ?35 replies | 809 view(s)
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24th February 2020, 01:12Easy peasy replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power ElectronicsV ripple is given as 1Vpp ( at a min load ) this is 350mV rms, most of the current ripple generated by the converter is soaked up by the...11 replies | 402 view(s)
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24th February 2020, 01:06Easy peasy replied to a thread Need to ensure SMPS output filter has at least 10mR of ESR...use "ESR resistor"? in Power ElectronicsSay you use 1000uF on the o/p, ues 2 x 470uF low ESR put 10 milli-ohm in series with one of them - job done - it will be stable ...7 replies | 277 view(s)
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23rd February 2020, 21:59Easy peasy replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects Problemspower in snubber resistors is approx = C. Vpk^2 F for 15-0-15 Vpk ~ 42Vpk, F = 50/60 Hz, say C = 100nF, then power in R = 10mW for...43 replies | 3974 view(s)
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23rd February 2020, 21:53Yes the 200W light bulb is only a few ohms when cold - so unless your soft start is ~ 30 seconds, you will never get it going ... even then...35 replies | 809 view(s)
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23rd February 2020, 07:18Easy peasy replied to a thread Inductance of coile dup cbale on winch (twisted pair or just two strand) in Power Electronicsagreed - twisted pair and side by side is essentially the same thing, for send & return coiling has no effect ... - - - Updated - - - as to...2 replies | 219 view(s)
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23rd February 2020, 07:16transformer design and phasing of windings is critical to the flyback circuit working - as is making sure the feedback is working before applying...4 replies | 265 view(s)
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22nd February 2020, 23:03Easy peasy replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects Problemsif you are happy putting snubbers across the 15Vac - then go for it ...43 replies | 3974 view(s)
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22nd February 2020, 10:37there is no limit on the duty cycle if the feedback, via opto, does no work properly. There is a 36V zener inside the chip on the Vcc line - but...35 replies | 809 view(s)
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22nd February 2020, 10:23the problem here is lack of cognitive function, without a zener the Vcc will be exceeded if the IC does not start ....35 replies | 809 view(s)
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22nd February 2020, 10:13Simple logic tells you that if the IC fails through over-voltage it is likely that over-voltage will make it to the gate pin, holding the fet on, ...35 replies | 809 view(s)
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22nd February 2020, 09:41OK - it's pretty ugly gate drive - but cannot say more without a schematic ...69 replies | 3638 view(s)
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22nd February 2020, 09:40As above - there is no zener to limit the volts on the chip supply ....35 replies | 809 view(s)
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22nd February 2020, 04:55temp rise is a function of the watts dissipated in the Tx and the surface area and shape of the Tx and any cooling air flow - there is no simple...14 replies | 565 view(s)
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22nd February 2020, 04:46Sorry but none of the documentation provided helps to solve your issue - schematic please - it could be that you are running off an isolated...35 replies | 809 view(s)
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21st February 2020, 21:46R = rho. L / Area is what an engineer would use, watts dissipated = R . i^2 ( for rms current in the wire ) then there is an added...14 replies | 565 view(s)
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21st February 2020, 21:43I wouldn't worry about that too much - - is that the gate drive ... ?69 replies | 3638 view(s)
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21st February 2020, 21:40Easy peasy replied to a thread Please help power supply dead 110V to 24vdc 5vdc in Service Manuals, Requests, Repair Tipsntc could have gone open ckt - but more likely the low power ckt supplying the IC has died - hence the IC dead & main mosfet check o/p diode...7 replies | 410 view(s)
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21st February 2020, 21:38you need to post the schematic - you are doing something wrong - but the magic crystal ball is clouded over by lack of real information ...35 replies | 809 view(s)
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19th February 2020, 22:17Easy peasy replied to a thread common mode feedback question in Analog Integrated Circuit (IC) Design, Layout and Fabrication- another assumption unless the op-amp is ac coupled with a capacitor - it will act down to DC ...8 replies | 428 view(s)
About Easy peasy
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- founder MagnetPowerNZ Ltd
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- Melbourne
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- engineer
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