Easy peasy
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Today, 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 - ...2 replies | 73 view(s) -
Today, 04:48The 1k should be in the Drain of Q5 ... else it affects the gate drive volts of Q5 ...3 replies | 54 view(s)
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Today, 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 | 291 view(s)
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Yesterday, 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 | 291 view(s)
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Yesterday, 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 | 291 view(s)
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Yesterday, 04:19where are you buying for control IC's from ... ?35 replies | 709 view(s)
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Yesterday, 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 | 291 view(s)
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Yesterday, 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 | 208 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...42 replies | 3865 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 | 709 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 | 204 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 | 243 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 ...42 replies | 3865 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 | 709 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 | 709 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 | 709 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 | 3586 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 | 709 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 | 472 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 | 709 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 | 472 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 | 3586 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 | 387 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 | 709 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 | 395 view(s)
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19th February 2020, 22:12Mica and thermal paste is not rated for more than 100V, so check the insulation to the heat-sink in case you knocked it and things got shorted out...69 replies | 3586 view(s)
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19th February 2020, 20:58Easy peasy replied to a thread common mode feedback question in Analog Integrated Circuit (IC) Design, Layout and Fabrication- you are making a big assumption - based on what exactly ...?8 replies | 395 view(s)
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19th February 2020, 15:58how are you heatsinking the fets?69 replies | 3586 view(s)
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19th February 2020, 09:42To attenuate the switching noise of the converter the C would have to be on the left of the L, as it is the filter is filtering what is coming thru...8 replies | 351 view(s)
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19th February 2020, 07:51Actuarrrly, the Zo of that filter is 0.22 ohms - so 0.3 ohms is just a bit higher than critically damped ( i.e. less damped )8 replies | 351 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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