treez
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Today, 06:29Thanks, presumably thats because the combination of the AC filter section and the TVS's ensures the downstream SMPS circuitry sees no more than...7 replies | 211 view(s) -
Yesterday, 21:33Thankyou...we have behind a diode (its for the 10W flyback and the diode is so the Power factor is not detrmiented) And there is 130nF oif ceramic...7 replies | 211 view(s)
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14th September 2019, 17:44treez started a thread To which standards must we conform for our electronics/electrical product? in Professional Hardware and Electronics DesignHello My company has developed a way of removing body and facial hair for cosmetic reasons. It involves high frequency flashing (~1KHz) of high...4 replies | 249 view(s)
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14th September 2019, 17:05Thanks, the 100pF caps were placed across diff mode inductors...i was assured by the engineer that it was for moving peaks on the scan to get the...14 replies | 2100 view(s)
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14th September 2019, 11:53I have seen quite a few offline SMPS schematics with 100pF or so capacitors across the diff mode filter inductors. This is said to offer the...14 replies | 2100 view(s)
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14th September 2019, 10:03Hi, We wish to analog dim this chip down to 25% output, and then we obviously have to PWM dim to further get the leds dimmer from there. I trust...1 replies | 139 view(s)
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14th September 2019, 00:41As can be seen, this LSP05240 Mains Surge module lets through up to 1100V of ‘residual’ voltage. Obviously, the surge module has to go upstream of...7 replies | 211 view(s)
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13th September 2019, 22:34Hi I attended an interview and they briefly showed a schem of a 650W Boost PFC. Just downstream of the Diode, there was a gate controlled device,...4 replies | 281 view(s)
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8th September 2019, 20:41treez started a thread Type one compensator...why is everybody giving it a phase of -90 degreees in Power ElectronicsSurely a type one compensator phase vs frequency Bode plot should always be drawn with -270 degrees phase? I mean, -180degrees for the inverting...2 replies | 187 view(s)
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8th September 2019, 19:54I did one like that but it was very low power......it was because my PCB was connected to a 50khz power bus and had to slowly charge a battery from...6 replies | 285 view(s)
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8th September 2019, 19:47treez started a thread SMPS feedback compensation..origin pole is "pole at origin"? in Power ElectronicsHi http://www.ti.com/lit/an/slva662/slva662.pdf ..pg 4 , equation 8 of the above doesnt make sense....because "fp0" is zero Hertz...it has to be...3 replies | 306 view(s)
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8th September 2019, 12:12To design a half bridge transformer, first design a virtual buck converter with your vout. Decide what is your max duty cycle (say 0.7). So you...8 replies | 539 view(s)
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8th September 2019, 12:01treez started a thread SMPS feedback loop parameters...."Excess phase" is king? in Power ElectronicsHello, I am reading page 205 of “power supply cookbook” by Marty Brown, 2nd ed. It says that there are three main parameters in SMPS stability…...0 replies | 102 view(s)
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8th September 2019, 10:26Thanks Klaus, especially for your great help on this subject some time ago aswell. I wonder when we have people charging electric cars all over the...7 replies | 463 view(s)
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8th September 2019, 10:10Thanks, at one of the worlds major TV design/manufacturers, they were using a ferrite bead in the place where i show a drain_inductor....(they...4 replies | 281 view(s)
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7th September 2019, 20:40How is the mains so stable in large cities like London?....surely it is because there are thousands of micro generators all over London, with...7 replies | 463 view(s)
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7th September 2019, 19:27Yes, when the diode goes off, the diode voltage suddenly collapses from abotu 0.7v to zero, and its klind oif liek a step input, and the buick...2 replies | 258 view(s)
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7th September 2019, 19:21treez replied to a thread SMPS PFC+LLC/Flyback 24V 100W low THD cool thermals reference design? in Power Electronicsor you could do a simple BCM Boost PFC....followed by Innoswitch syncronous rectified flyback on the output.3 replies | 338 view(s)
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7th September 2019, 19:14treez replied to a thread Flyback SMPS power MOSFET getting hot? uc3843 pwm converter in Power Electronics2v is too low for a fet to turn on properly. What is your vin. What is the gate series resistor value. Can you show scoep shot of gate voltage on...17 replies | 571 view(s)
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7th September 2019, 19:09There is a small inductor in the drain of the fet of this boost converter (attached). It massively reduces the reverse recovery spike that goes...4 replies | 281 view(s)
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5th September 2019, 19:40treez started a thread [moved] Switch mode power supply interview question and response...bluffing? in Power ElectronicsAt an interview today, the engineer told me that Voltage mode controlled SMPS’s need slope compensation to be added when the duty cycle goes...3 replies | 292 view(s)
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3rd September 2019, 14:54Hi, The MCP6001 offers "rail to rail input and output".....but if the vin goes above 3.1v, then it latchs up to the 3.3v rail. Do you know where in...1 replies | 210 view(s)
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3rd September 2019, 06:18Thanks, sorry i thought you were going to say .... "For an SMPS the Earth current is the unwanted = leakage current, plus the capacitive current." ?7 replies | 442 view(s)
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2nd September 2019, 20:44Thanks, Precision around +/-0.05v vbus/300 is made from a potential divider fed to a opamp buffer. Load impednace >10Meg4 replies | 291 view(s)
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2nd September 2019, 19:55Hi As in the attached schematic, we wish to add a 1.2V offset to the signal “HSIN”. The circuit does it but needs two opamps and a negative supply....4 replies | 291 view(s)
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2nd September 2019, 14:09The "Y capacitor current" we would say is the normal capacitive current and is V/Z. "Leakage" current in a capacitor, pertains, i thought, to...7 replies | 442 view(s)
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2nd September 2019, 11:11treez started a thread Thermal camera reading fet temperatures...how far away to hold it? in Miscellaneous EngineeringFor assessing the temperature of FETs on the PCB, how far away from the fet should this thermal camera (HT-04) be held? The spec appears to suggest...2 replies | 1230 view(s)
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2nd September 2019, 06:05treez replied to a thread Reducing radiated emissions in an offline flyback SMPS transformer in Power ElectronicsThanks, but do you suspect that the grounded outer coil stops that?...like a flux band Like pg20 of this...6 replies | 424 view(s)
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2nd September 2019, 06:03Thanks, but that would not be classified as "leakage"?7 replies | 442 view(s)
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1st September 2019, 21:10Hello, Is the earth leakage current in this PSU a little high at 500uA? https://www.xppower.com/portals/0/pdfs/SF_ASB110.pdf What might be...7 replies | 442 view(s)
About treez
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- April 5, 1982 (37)
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- cyclist
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- cambridge
- Interests:
- football, cycling
- Occupation:
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