baileychic
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Today, 02:31Easy peasy replied to a thread Passing both DC and pulses through a toroid? in Analog Circuit Designit is at odds with logic, because, a piece of wire or magnetic core, cannot "know" when next in time a signal is going to reverse .... so how...16 replies | 567 view(s) -
Yesterday, 23:03Easy peasy replied to a thread Passing both DC and pulses through a toroid? in Analog Circuit Designinterestingly - this appears not to be the case in power electronics when applied to losses in magnetics (and wires) - you would think the DC...16 replies | 567 view(s)
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Yesterday, 22:57Easy peasy replied to a thread Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter) in Power Electronicsyou should put a common mode choke ( size commensurate with current flowing ) right at the upper gate drive on the isolated DC as it comes in - ...10 replies | 339 view(s)
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Yesterday, 15:49Easy peasy replied to a thread Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter) in Power ElectronicsADD 470nF to the 2.2uF ...!10 replies | 339 view(s)
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Yesterday, 04:02Easy peasy replied to a thread Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter) in Power Electronicslight load ( at usually high frequency ) is one of the danger spots for LLC if the dead time is not perfect ... - - - Updated - - - a good...10 replies | 339 view(s)
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Yesterday, 00:17Easy peasy replied to a thread Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter) in Power Electronicsthe spikes are likely a result of your probing - can you post a pic please? if you have too much dead time you may be hard switching the top...10 replies | 339 view(s)
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21st October 2019, 19:51Easy peasy replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticsapologies - I must be so used to dealing with L & C, certainly the freq most quoted is when R = 1/ ( 2 pi f C ) so the impedances are the...24 replies | 1124 view(s)
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21st October 2019, 09:08Easy peasy replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticsat the 3dB freq the volts reduce to 0.707 across the C only ....24 replies | 1124 view(s)
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20th October 2019, 09:05Easy peasy replied to a thread Passing both DC and pulses through a toroid? in Analog Circuit Designfor a very large toroid; the first single turn with 5V applied will have its current ramping up at 5/Lpr amps per sec, the flux in the core...16 replies | 567 view(s)
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17th October 2019, 22:21you are referring to a cascaded buck + boost, 2 converters in one ...21 replies | 850 view(s)
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17th October 2019, 20:15it is part of the overall losses and does not lend itself to exact calculation - frequency makes a difference as does the shape of the currents...7 replies | 394 view(s)
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17th October 2019, 20:12LT8705 is a lot of bits if you just want a low power converter @ asdf44; I think the point is made - with good layout capA is not required...21 replies | 850 view(s)
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17th October 2019, 15:18cap A is there by virtue of B & C, i.e. cap A can be deleted if B & C are there ...21 replies | 850 view(s)
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17th October 2019, 09:20try searching: ...21 replies | 850 view(s)
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17th October 2019, 09:12Easy peasy replied to a thread [SOLVED] HEI primary current duration in Elementary Electronic Questionsinterestingly that IGBT has 120 ohm internal gate resistor to guarantee a slower turn on / off - it also has 1.25V Von drop at 6A ... which...14 replies | 1237 view(s)
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17th October 2019, 03:49Easy peasy replied to a thread [SOLVED] Generation of 4 Phase Shifted clock Signals in Analog Circuit DesignCD4015B should do it (?) 4 stage shift register - dual - - - - Updated - - - sorry - I missed post #7 - at 2.5MHz it is futile...12 replies | 636 view(s)
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17th October 2019, 03:45Easy peasy replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticsrespectfully - even if there is loads of resistance as there is here - 50 ohm in fact - the Smith chart tells you the reactive impedance AND...24 replies | 1124 view(s)
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16th October 2019, 22:40respectfully - you not bucking or boosting from input to output... a common ground is also often assumed which this ckt cannot supply21 replies | 850 view(s)
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16th October 2019, 20:37Easy peasy replied to a thread [SOLVED] Wiring of DC fans in Series in Elementary Electronic Questionsa cheap buck converter to give to 12V for the fans is looking better and better ...20 replies | 907 view(s)
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16th October 2019, 20:34you may get the same total losses as only one fet to control and one o/p diode - plus far easier control - less time to build and get going...21 replies | 850 view(s)
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16th October 2019, 09:55Easy peasy replied to a thread [SOLVED] Wiring of DC fans in Series in Elementary Electronic QuestionsQ4 is not needed - Q3 will dissipate, Ifan * 15V so be careful there ...20 replies | 907 view(s)
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16th October 2019, 08:36Easy peasy replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsA PC psu should be designed to at least 2.5kV ac phase to o/p's if not it is a very bad PC to own a dish washer could be run thru an...46 replies | 2588 view(s)
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16th October 2019, 08:31Easy peasy replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticshe reactive part is 77.16 ohms, this is the sum of the Xc & XL, at 205MHz it is basically all capacitive so yes = Xc24 replies | 1124 view(s)
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16th October 2019, 06:55A flyback is also a buck-boost ( the original in fact ) - - - Updated - - - as is a Sepic21 replies | 850 view(s)
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16th October 2019, 06:51Easy peasy replied to a thread [SOLVED] Wiring of DC fans in Series in Elementary Electronic QuestionsR's are fine - but extra power draw / loss and no guarantee of sharing at power up where fans can and do draw more than 5x the run current - ...20 replies | 907 view(s)
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16th October 2019, 06:49Easy peasy replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticsthe Smith chart is for a specific 10pF cap, that is clue #1, it is not explicitly shown on the Smith chart, but the 77 ohm at 205MHz gives you...24 replies | 1124 view(s)
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16th October 2019, 04:09Easy peasy replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsYou could go around cutting out all the Y caps ( RFI caps that go from phase & neutral to "earth" ) inside the appliances that have them - ...46 replies | 2588 view(s)
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16th October 2019, 04:00Easy peasy replied to a thread [SOLVED] Wiring of DC fans in Series in Elementary Electronic Questionsa 5W 16V zener across each fan will be the way to go, else a buck converter to 15V to run both of them in //.20 replies | 907 view(s)
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16th October 2019, 03:57Easy peasy replied to a thread [SOLVED] Generation of 4 Phase Shifted clock Signals in Analog Circuit DesignCMOS gate parts can do this easily @ 2.5MHZ look up the CD4000 series - there should be a shift register type part that will do it in 16...12 replies | 636 view(s)
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16th October 2019, 03:55boost converter usually has low side drive to the fet which is easier, buck converter needs a level shift driver or a P channel fet - more...21 replies | 850 view(s)
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