treez
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Today, 14:44but you seemed to say that you had 84v on a 21v zener?29 replies | 363 view(s) -
Today, 14:17R7, at 12k, is way too low ohmic value. Please tell what is R7?...what package and power rating? Also, what is your Z4 value....you could be...3 replies | 105 view(s)
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Today, 14:08So you put a 21V zener in the circuit, and the voltage at the cathode of the zener went to 84v?..........something is very wrong here....the zener...29 replies | 363 view(s)
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Today, 14:05treez started a thread Why dooes offtheshelf DCDC module limit the numbr of parallel units? in Power ElectronicsHello Page 1 of the DCM3623T50M53C2T00 datasheet states that only up to 8 modules can be placed in parallel. Why is this? Why not say, 40 in...0 replies | 0 view(s)
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Yesterday, 17:46esd damage to your uc3843? If a 150k resistor is connected to a >47uF cap at the vcc pin, it shoudl simply not be possible for the vcc voltage to...29 replies | 363 view(s)
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Yesterday, 14:29Yes all the points above are valid, and especially from Klaus who has given me and many many others some fantastic electronics info in the past. But...29 replies | 363 view(s)
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21st February 2020, 23:21treez started a thread Inductance of coile dup cbale on winch (twisted pair or just two strand) in Power ElectronicsHi, The cable seen at 4:50 of this.. https://www.youtube.com/watch?v=GzTMaXfLFb4 ..is 100m long. Since it comprises "go" and "return", the...2 replies | 141 view(s)
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21st February 2020, 19:43I think you should use an R/ZENER/BJT startup regulator...(high voltage BJT) Diode OR it out when the bias winding gets up to voltage (also,...29 replies | 363 view(s)
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21st February 2020, 19:41yes i believe i see your point, and in addition, it looks to me that upstream of this heavily damped inductor, there will be a need for a CLC...8 replies | 284 view(s)
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19th February 2020, 06:44Thanks, from the Bode plot etc, the inductor is being pretty well shorted out, so i believe we will need to get rid of the 0.3R parallel resistor...8 replies | 284 view(s)
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18th February 2020, 22:03Hi, In the Vicor DCM3623 DCDC module datasheet (below) , page 21, there is, at Figure 23, an LC input filter to some DCM3623 modules in parallel....8 replies | 284 view(s)
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18th February 2020, 21:32treez replied to a thread Designing Inductor for designing of buck boost converter of 50W in Power ElectronicsBriefly..pick a ferrite core (eg ETD, PM, POT core, etc etc)....see eg ferroxcube or TDK data books of cores. Then you will wind it with enammelled...2 replies | 189 view(s)
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17th February 2020, 09:05(i'll say nothing, i got my brains smashed up once when asked to design Cuk's single stage isolated PFC'd Cuk converter for an EV charger at...23 replies | 803 view(s)
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16th February 2020, 21:51That's a great link...see Dr Slobodan Cuk of Tesla is talking air gaps there.23 replies | 803 view(s)
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16th February 2020, 13:59here i attach ltspice with LPRI = 1mH...just for sake of argument...and to keep it in DCM......i had to reduce the fsw to 16khz......and adjust LSEC...23 replies | 803 view(s)
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16th February 2020, 13:49Well...i made it just on the border of DCM/CCM at 270VDC with 226uH = LPRI and FSW=100khz......which is a good situation. If you increase LPRI,...23 replies | 803 view(s)
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16th February 2020, 13:19treez started a thread Where to buy Electronics components in UK for domestic use? in Miscellaneous EngineeringHi, I am in UK. I have now bought two DAB radios (from supermarkets) and neither of them work on the switch mode mains adapter that they were...2 replies | 403 view(s)
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16th February 2020, 11:25I attach here the new transformer in the ltspice schem for DCM at 230VAC...in fact, its DCM down to 270vdc input on the HV bus, so you have some...23 replies | 803 view(s)
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16th February 2020, 11:06if you dont have airgap in flyback txfmr then it will saturate immediately because when you power up it is on full load charging up the output...23 replies | 803 view(s)
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15th February 2020, 19:54Give me a shout if you want me to re-do your transformer for DCM over all VAC input? Please also tell what is your VAC input range?23 replies | 803 view(s)
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15th February 2020, 15:36Do you want to know about.... 1...Operation of active clamp flyback? 2...current mode control in flyback? 3....A sinusoidal inverter using a full...1 replies | 172 view(s)
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15th February 2020, 15:31did you look at it with thermal camera?...see if anything getting hot...there is a good therm cam you can buy for £150...ask me and i will tell you...5 replies | 302 view(s)
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15th February 2020, 12:36Hi I did your flyback in LTSPICE. It is attached for you….This is the free sim from analog.com…..you can run it by simply converting it to .asc...23 replies | 803 view(s)
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15th February 2020, 10:52treez replied to a thread The "cheap, quick and easy" way to do high power SMPS's? in Power ElectronicsThanks, The principle of the top post…..can it equivalently be done with two vicor DCM modules in parallel?....but this time with an error...9 replies | 409 view(s)
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14th February 2020, 08:43treez replied to a thread The "cheap, quick and easy" way to do high power SMPS's? in Power ElectronicsThanks, I admit that one controller is better…..(eg one error amplifier for multiple units etc etc)……though in some ways I like the idea of a totally...9 replies | 409 view(s)
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13th February 2020, 22:11treez started a thread The "cheap, quick and easy" way to do high power SMPS's? in Power ElectronicsHi, Is this the “cheap, quick and easy way” to do high power SMPS’s? The attached shows two identical Two Transistor forward converters in...9 replies | 409 view(s)
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13th February 2020, 21:34treez started a thread Heatsinking for Vicor DCDC modules on a test PCB? in PCB Routing Schematic Layout software and SimulationHi, We are doing a Test PCB containing one Vicor BCM4414xH0E5035yzz module, which will feed 4 paralleled Vicor DCM3623x50M53C2yzz modules....1 replies | 339 view(s)
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12th February 2020, 09:12...on the theme.......we could have eight identical paralleled 1.5Kw two transistor forwards……..and put a current limiter on the output of each...23 replies | 1006 view(s)
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12th February 2020, 08:40sorry here is the link to the smps course with the section on pfc... https://drive.google.com/open?id=0B7aRNbu3Fes4TU92Mkw3YlA3ams ...it shows...13 replies | 611 view(s)
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11th February 2020, 22:05treez replied to a thread Intrerleave wind transformer on Phase Shift Full Bridge converter? in Power ElectronicsThanks, i thought proximity losses were worse when there were say, multiple layers of windings on top of each other.6 replies | 442 view(s)
About treez
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- April 5, 1982 (37)
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