treez
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Today, 00:54treez replied to a thread Grid tied inverters will result in high mains voltages above 300VAC..do you agree? in Elementary Electronic QuestionsI believe the overvoltages would be more common over short time ranges of up to 10 milliseconds or so.....because the GTIs would quickly sense the...2 replies | 23 view(s) -
Yesterday, 22:50treez started a thread Grid tied inverters will result in high mains voltages above 300VAC..do you agree? in Elementary Electronic QuestionsWhen a grid tied inverter (from a solar fed battery) is connected to the mains, it senses the mains voltage and disconnects if the mains voltage...2 replies | 23 view(s)
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Yesterday, 18:02Please read the attached6 replies | 368 view(s)
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Yesterday, 12:06here is some help with layout, which you also requested6 replies | 257 view(s)
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Yesterday, 02:26treez started a thread PFC controller datasheets do not tell you that they need to damp LC filter ringing? in Power ElectronicsHi Why is it that PFC controller datasheets don’t tell you that they all have a facility to damp the LC filter ringing near the mains zero...0 replies | 211 view(s)
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Yesterday, 01:24treez started a thread Flyback SMPS constant off time controller with PIC micro? in MicrocontrollersHi, We wish to program the PIC16F176X micro to be a constant off time controller for a Current mode Flyback SMPS. Please could you say if this is...0 replies | 83 view(s)
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30th November 2019, 17:23treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, yes I believe there is a real threat of instability here. Please could you check if the following would be unstable? (schematic attached) I...15 replies | 764 view(s)
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29th November 2019, 13:39treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsJust to note, I’ve just actually wired in 51.7uF of capacitance in parallel with C2, and its still not gone unstable. (11 pieces of 4u7, 0805,...15 replies | 764 view(s)
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27th November 2019, 21:42treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, I will read about “in loop compensation” etc, it sounds good. Today I actually addressed our contractor, and tried to talk him out of the...15 replies | 764 view(s)
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27th November 2019, 07:25treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, actually there is some requirement for the opamp to sink current some of the time. 15mA was just an average figure. What would you say is...15 replies | 764 view(s)
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26th November 2019, 21:43treez started a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsHi We wish to have this 8V3 Regulator. (attached) Do you think the amount of output capacitance will make the MIC6211 opamp go unstable? MIC6211...15 replies | 764 view(s)
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25th November 2019, 21:01treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, yes you are right, controlling temperature by controlling the flow rate appears to be the main method....but it is a poor method....just...28 replies | 1241 view(s)
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24th November 2019, 20:47treez started a thread Do you know the efficiency vs output load for this dcdc module? in Miscellaneous Engineeringhttps://www.cui.com/product/resource/pds1-m.pdf ..the datasheet doesnt say. It only says "up to 82%" Its the PDS1-S12-D15-M one ...1 replies | 530 view(s)
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24th November 2019, 19:52treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsHaving re-looked at the shower of post #21, I now agree with your words. It’s the flow rate that is being adjusted to give a wide range of...28 replies | 1241 view(s)
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24th November 2019, 14:50treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, I also read the manual. There are three flow settings. Then there’s the temperature dial for you to increase/decrease temperature with...28 replies | 1241 view(s)
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24th November 2019, 14:10treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power Electronicssorry Betwixt, i should have made clear that i am only speaking of "electric showers" here.....you are kindly referring to whats known in shower...28 replies | 1241 view(s)
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24th November 2019, 11:52treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsInterestingly, The following electric shower.. https://www.mirashowers.co.uk/showers/electric-showers/mira-decor-dual-108kw/ ..has an extremely...28 replies | 1241 view(s)
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23rd November 2019, 21:28treez replied to a thread PIC1F1508 with four PWM outputs operating at different frequency? in MicrocontrollersThanks, oh no, we need some to be slower than others, thats why i was hoping that one of the pwm streams can have like a software flip flop put with...4 replies | 313 view(s)
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23rd November 2019, 16:46treez started a thread PIC1F1508 with four PWM outputs operating at different frequency? in MicrocontrollersPage 252 of the PIC16F1508 datasheet suggests that the four PWM outputs of the PIC16F1508 must all be the same frequency. However, is their some way...4 replies | 313 view(s)
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20th November 2019, 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 | 783 view(s)
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19th November 2019, 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 | 783 view(s)
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19th November 2019, 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 | 783 view(s)
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19th November 2019, 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 | 783 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 | 783 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 | 277 view(s)
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16th November 2019, 20:34Sorry no its temperature dependent.28 replies | 1452 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 | 783 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 | 783 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 | 783 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 | 338 view(s)
About treez
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- April 5, 1982 (37)
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