treez
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Today, 07:25treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsThanks i see what you mean and agree. This does appear to be a mistake in the regulations though.......i mean, the customer may only need 25W at a...15 replies | 500 view(s) -
Yesterday, 20:43treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsAs discussed, the Class C regulations require conformance all the way down to 25W. However, as I have remarked, its not economically feasible to ...15 replies | 500 view(s)
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Yesterday, 07:31treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsOK thanks, ill look into adapting it for opto-isolated feedback.15 replies | 500 view(s)
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Yesterday, 06:41treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsThanks, but we are sure its Table 2, page 7 (class C ) standard for 25W upwards for lighting supplies... http://www.epsma.org/PFCver100406_b.pdf ...15 replies | 500 view(s)
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17th November 2019, 20:38treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsHi The attached LTspice simulations show a 97W PFC’d Flyback LED driver which passes mains harmonics at 97W…but when the dimmed down version at 29W...15 replies | 500 view(s)
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17th November 2019, 17:57usually, a full wave rectifier would supply the input bus voltage needed by the interleaved active clamp flyback. You cant make a full wave...3 replies | 189 view(s)
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16th November 2019, 20:34Sorry no its temperature dependent.26 replies | 1107 view(s)
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16th November 2019, 19:33treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsThanks Volker… ..i hate to say it, but that is open to interpretation, and also, it says that it only concerns those conditions identified by the...15 replies | 500 view(s)
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16th November 2019, 16:42treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsThanks, I would love to be able to afford these specs so i can read exactly what is said. The thing is, there is a question here which may remain...15 replies | 500 view(s)
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16th November 2019, 12:03treez replied to a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsThanks for your quote. From the way that is worded, it does look to me that the mains harmonics are only to be tested at the maximum load. It talks...15 replies | 500 view(s)
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16th November 2019, 09:54yes it sounds like you are doing leading edge dimming. I think trailing edge dimming may be slightly less EMC noisy. You can also make the switched...4 replies | 273 view(s)
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16th November 2019, 09:45by the polarity dots on your CMC, i see that it is connected correctly....it is connected such that the field from the one coil, will cancel the...1 replies | 131 view(s)
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16th November 2019, 09:41treez started a thread Mains harmonic emissions for dimmable offline LED drivers. in Power ElectronicsHi, As you know, its not difficult to design and build an offline SMPS LED driver that can run at 235W output, and also be dimmable down to 25W...15 replies | 500 view(s)
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15th November 2019, 07:38treez replied to a thread Will this ceramic capacitor be damaged by overvoltage spikes? in Analog Circuit DesignThanks, I must admit, I once worked in a huge multinational aerospace company. I was doing a board where I needed more capacitance but didn’t have...6 replies | 299 view(s)
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14th November 2019, 21:53treez started a thread Will this ceramic capacitor be damaged by overvoltage spikes? in Analog Circuit DesignHi, I exposed a 630V rated ceramic capacitor (1812, X7R) to a spike voltage of 680Vpk. (the spike voltage as in the attached) It did not blow up....6 replies | 299 view(s)
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13th November 2019, 07:41pcb design as attached26 replies | 1107 view(s)
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12th November 2019, 20:27did you kelvin connect the sense resistor? Did you put a gate series resistor to damp the fet switch on?26 replies | 1107 view(s)
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11th November 2019, 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 | 785 view(s)
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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 | 732 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 | 785 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 | 785 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 | 434 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 | 785 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 | 343 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 | 732 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 | 785 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. - - -...26 replies | 1107 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 | 344 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 | 434 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 | 732 view(s)
About treez
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- April 5, 1982 (37)
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