treez
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Yesterday, 07:02treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power Electronicsthanks, yes because its an electric shower.19 replies | 561 view(s) -
10th November 2019, 19:59treez replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsThanks, its only just creeping into CCM...so the reverse recovery of the output diode wont be as bad as it could be in hard CCM. But i guess you are...17 replies | 495 view(s)
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10th November 2019, 19:54treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, do you think the attached mains input current waveform would pass EN61000-3-11? Its 32ARMS. If this were the mains input current waveform...19 replies | 561 view(s)
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10th November 2019, 17:08treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsOK Thanks very much, i now appreciate that we cant do 10ms "gaps". According to pg 12 of the following on EN61000-3-11, for the attached LTspice...19 replies | 561 view(s)
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10th November 2019, 13:07treez replied to a thread What is saturation current of ELC09D-221 (220uH) inductor? in Elementary Electronic QuestionsThanks FvM, that's brilliant, we will change to the Wurth 7447452221 - - - Updated - - - The RLB0914 is some five times cheaper though, and...4 replies | 375 view(s)
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10th November 2019, 12:30treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, it looks like electric showers are 7.5 to 10kW......this comes off single phase mains, but it has its own thicker wiring...and comes off its...19 replies | 561 view(s)
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10th November 2019, 12:18treez replied to a thread MOSFET gate driver trasformer isolated in Service Manuals, Requests, Repair TipsThe value of CB will depend on the primary inductance. You will need to tell the primary and secondary inductances, but we presume its 1:1. The Q1,...1 replies | 181 view(s)
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10th November 2019, 11:45treez replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsThanks yes, I believe you are right, the ripple seen is part real and part due to the noise of it edging into CCM at the peak. This flyback was...17 replies | 495 view(s)
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9th November 2019, 22:53treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, Presumably the attached two mains input current waveforms to the heater are perfect, and would cause no problem in the mains supply...19 replies | 561 view(s)
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9th November 2019, 21:58always do a representative simulation before doing a power supply. LTspice is free and the LT124X series is the same almost as UC384X. - - -...16 replies | 612 view(s)
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9th November 2019, 21:49Power supply repair is usually electrolytic capacitor replacement. Or maybe MOV and fuse replacement if it got taken out by a transient. Or maybe...4 replies | 295 view(s)
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9th November 2019, 21:05another reason for AC is it means relays get less damage from switching....eg, a relay for 250vac would only handle switching 30vdc >60hz means...9 replies | 348 view(s)
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9th November 2019, 20:59treez replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsThere is no boost choke. The flyback does pfc and outputs to the leds.17 replies | 495 view(s)
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9th November 2019, 19:54treez started a thread What is saturation current of ELC09D-221 (220uH) inductor? in Elementary Electronic QuestionsUnfortunately , Datasheet only gives irms.. http://industrial.panasonic.com/cdbs/www-data/pdf/AGB0000/AGB0000C1.pdf4 replies | 375 view(s)
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9th November 2019, 18:12treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, if you look at the waveform of the top post, it skips only 10ms intervals, but the overall DC is zero......it skips a positive half cycle,...19 replies | 561 view(s)
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9th November 2019, 15:31treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, you mean by full wave that a full 20ms must be switched out, not just 10ms?19 replies | 561 view(s)
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9th November 2019, 15:06smazzer your particular concern, as described by others above, is not relevant in the case of the sync buck...but yes, your point is very relevant in...7 replies | 306 view(s)
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9th November 2019, 14:36treez replied to a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsThanks, its Constant off time flyback (off time = 8.2us). I scoped the primary sense resistors and theres no saturation anywhere in the 10ms half...17 replies | 495 view(s)
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9th November 2019, 14:10treez started a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsHello, We have an electric heating element connected to the mains. We wish to regulate the temperature by skipping half mains cycles, as in the...19 replies | 561 view(s)
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9th November 2019, 02:20treez started a thread Scoping the post rectifier DC bus in a 240VAC , 100W PFC'd flyback in Power ElectronicsHello I was scoping the Primary , Post rectifier DC Bus in a 100W, 240VAC, offline PFC’d Flyback to see what the voltage ripple was like on this...17 replies | 495 view(s)
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6th November 2019, 21:43treez replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit Design.....Now this is quite a point. Fluke do use it , (as in the above video in post #12 above) and they use it because it’s a super-quick acting...21 replies | 639 view(s)
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6th November 2019, 21:06treez replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignThanks , this is very interesting. I’ve now heard it from a few different sources that driving current through the VEBO (zener) is bad in that ...21 replies | 639 view(s)
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5th November 2019, 07:11treez replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignThis video discusses using an NPN as a clamping zener diode, via its reverse biased BE junction...21 replies | 639 view(s)
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4th November 2019, 20:56treez replied to a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignThanks, this is on the PCB now, which has been made, and we cant go back unfortunately. Anyway, i think we will increase the base resistor to 3k3...21 replies | 639 view(s)
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3rd November 2019, 22:02treez started a thread Will we get tombstoning of this capacitor and resistor? in PCB Routing Schematic Layout software and SimulationHi, Please advise if we will get “tombstoning” if we remove the thermal reliefs to the pads of the following components.. The component ringed...4 replies | 236 view(s)
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3rd November 2019, 21:45treez started a thread NPN having its VBE protected against reverse voltage....but unecessary? in Analog Circuit DesignHi, The attached circuits provide an 8.3V rail which supplies approx. 10mA. The Left-hand version shows a diode D1, which is supposed to protect...21 replies | 639 view(s)
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3rd November 2019, 14:03treez replied to a thread SMD Sync Buck converters with parallel FETs and no heatsinks in Power Electronicsthanks, all your ideas are great...thing is, in this case, any manual-labour heatsinking in the production assembly is going to knock the cost too...6 replies | 333 view(s)
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3rd November 2019, 11:52treez replied to a thread SMD Sync Buck converters with parallel FETs and no heatsinks in Power ElectronicsThanks, if not being paralleled, then what generally do you take as being the maximum power dissipatable in say a DPAK FET on a 2 layer FR4 PCB with...6 replies | 333 view(s)
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3rd November 2019, 00:05treez started a thread Adding capacitor to Cgs in low side FET of sync Buck converter. in Power ElectronicsPage 5 of the following says that when selecting the low-side FET in a synchronous buck converter, the Qgd/Qgs ratio should be as low as possible. It...4 replies | 245 view(s)
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2nd November 2019, 22:35treez started a thread SMD Sync Buck converters with parallel FETs and no heatsinks in Power ElectronicsWhy do you rarely get low voltage all-SMD sync buck schematics with say three SMD power FETs in parallel? Surely, paralleling SMD FETs here is the...6 replies | 333 view(s)
About treez
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- Date of Birth
- April 5, 1982 (37)
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- cyclist
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- cambridge
- Interests:
- football, cycling
- Occupation:
- engineer
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12th November 2019
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