treez
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Yesterday, 22:12treez started a thread Mains transient portection with capacitor coupling of transient in Power ElectronicsHi Do you agree that for mains transient protection only, the only bit of the damping/transient circuitry on the 28th page of the below datasheet...0 replies | 79 view(s) -
17th February 2019, 17:11Thanks, the voltage is due to the ringing between the filter L's and C's when there is a step input of the mains at mains peak. We are actually...2 replies | 143 view(s)
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17th February 2019, 01:15treez replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsThansk yes, we dont have overall ESD flooring, we just put PCBs into the pink plastic ESD bags when we transport them from place to place.17 replies | 283 view(s)
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16th February 2019, 23:53Hello We have a Panasonic ECQU2A224 220nF X2 capacitor in the AC filter of our offline 60W Flyback SMPS. When the product is connected to the mains...2 replies | 143 view(s)
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16th February 2019, 22:48treez replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsYes i know what you mean, but when you are busy, and constantly going to and from the bench multiple times each day, its easy to once forget to put...17 replies | 283 view(s)
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16th February 2019, 22:19treez replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsThanks, presumably you are talking of electric shock hazard here?17 replies | 283 view(s)
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16th February 2019, 21:38treez replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsThanks, So in the environment with the aluminium floor tiles that are connected to earth via 2 MegOhms, and the resistance through the soles of...17 replies | 283 view(s)
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16th February 2019, 20:41treez replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsThanks, the thing is, when wearing a single point wrist strap, where is the loop for the charge to flow in as part of the discharge process of the...17 replies | 283 view(s)
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16th February 2019, 20:18treez replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsThanks, As you know, for static charge to dissipate, there has to be a circuit loop in which it can flow. If a totally insulated person who is...17 replies | 283 view(s)
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16th February 2019, 19:12treez started a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsHi Supposing an electronics assembly worker walks towards their workbench. They first walk on a non-ESD safe carpet which gives them a high voltage...17 replies | 283 view(s)
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13th February 2019, 15:39Hi, We are looking for second source parts for our 1210 pulse rated 10R resistor (SGS73P2ERTTD100J) However, we can only find these... ...0 replies | 115 view(s)
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10th February 2019, 16:48Thanks yes you are right, i should have said the 6mA is only when DALI is transmitting...which isnt often, most often the current draw is around...4 replies | 230 view(s)
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10th February 2019, 12:24Hi We are doing a high voltage linear regulator to run off rectified 240VAC. The following two schematics are our possible choices. They would ...4 replies | 230 view(s)
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8th February 2019, 21:36treez replied to a thread Surge modules containg MOV and GDT in series...how to test the MOV for leakage currnt in Elementary Electronic Questionsthanks, yes we do that test, and thats why we need the GDT in series with the MOV to earth....otherwise it would blow when we do the insulation test....4 replies | 250 view(s)
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7th February 2019, 21:44treez replied to a thread High power, short time power pulses in FETs in Elementary Electronic QuestionsThanks, this fet can dissipate 1600w for 100us and no more....imagine it dissipating 1600W for 200us, then nothing for 0.999800...5 replies | 390 view(s)
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7th February 2019, 21:33May the IGBT be used in place of the FET in the attached? Also, considering any FET based linear regulator....i presume the FET could be simply...0 replies | 118 view(s)
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7th February 2019, 21:01treez started a thread Surge modules containg MOV and GDT in series...how to test the MOV for leakage currnt in Elementary Electronic QuestionsHi, On our offline product, we have Surge modules containing MOVs to Earth from mains input live and neutral. The MOVs to earth have a ...4 replies | 250 view(s)
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6th February 2019, 22:24treez started a thread High power, short time power pulses in FETs in Elementary Electronic QuestionsHi, Do you think that this FET (STD3NK90Z) could conduct 0.7A (with a Vds of 440V) for 50us? Then also for 500us? STD3NK90Z FET:...5 replies | 390 view(s)
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3rd February 2019, 02:18treez replied to a thread 3W power resistor at 100degC, 8 hours per night, 365days per year in Elementary Electronic QuestionsThanks but no unfortunately not….this resistor is mounted vertically on the PCB, because of lack of space…so we will have to have silicone squeezed...7 replies | 374 view(s)
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2nd February 2019, 19:36treez started a thread 3W power resistor at 100degC, 8 hours per night, 365days per year in Elementary Electronic QuestionsHello, We have an offline 60W Flyback SMPS. The primary clamp resistor is dissipating 450mW. This resistor is a 3W rated ROX3SJ39K. The power...7 replies | 374 view(s)
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2nd February 2019, 16:46treez replied to a thread LLC converter reverse current flow with secondary gate drive in Power ElectronicsYour 1MHz switching frequency sounds too high. You will get too much switching loss, because LLC still has some switching loss....due to the...5 replies | 351 view(s)
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2nd February 2019, 16:01Hello, We recently measured the temperatures of the components of our 60W Flyback SMPS with many k type thermocouples, whilst it was in the...2 replies | 253 view(s)
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2nd February 2019, 14:51Hello, Our contractor has decided that we can save money on our offline 240VAC lighting product by changing the 47R resistor in the attached...3 replies | 187 view(s)
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2nd February 2019, 14:31treez replied to a thread MCPCB which is double sided and with plated through vias in Power Electronicsto be honest, i've seen many LED tubes with LEDs on a 1mm thick FR4 PCB, and they have a good amount of thermal copper pour on the LED side, and the...14 replies | 749 view(s)
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2nd February 2019, 11:46treez started a thread Temperature of TO220 MOSFET tab measured through layers of kapton tape in Thermal ManagementHello We were measuring the temperature of the tab of a TO220 FET (dissipating 3W) in an 60W offline flyback SMPS. We glued the the k type...2 replies | 1136 view(s)
About treez
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- Date of Birth
- April 5, 1982 (36)
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- Power Electronics
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- Biography:
- cyclist
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- cambridge
- Interests:
- football, cycling
- Occupation:
- engineer
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