treez
Advanced Member level 5
Find latest posts
View Articles
View Blog EntriesMini Statistics
- Join Date
- 22nd September 2008
- Last Activity
- Today 06:55
- Blog Entries
- 0
More 4 Friends
Awards
No Awards.
Achievements
7 years registeredRecent Visitors
This page has had 21,278 visits
- Tab Content
- treez's Activity
- About Me
- Friends
- Experience
-
Older Activity
-
Today, 06:55treez replied to a thread Adding an LC post filter can make an SMPS unstable....use RC filter instead? in Power ElectronicsThanks, and by damped C's i take thats C's with "added ESR" (series resistors added)?7 replies | 215 view(s) -
Yesterday, 22:08Thats probably the only other one.....the zener or TVS clamp.....there is the RCDZ clamp which reduces rcd clamp dissipation in light or no load....27 replies | 1040 view(s)
-
Yesterday, 21:56treez replied to a thread Adding an LC post filter can make an SMPS unstable....use RC filter instead? in Power ElectronicsThanks, I am speaking of cases where the output feedback is taken upstream of the RC filter. Though I believe we would say that the reduced phase...7 replies | 215 view(s)
-
Yesterday, 09:06treez replied to a thread Adding an LC post filter can make an SMPS unstable....use RC filter instead? in Power ElectronicsThanks, i am thinking , the straight RC second-stage output filter may offer good enough filtration, and has no problem with any instability like...7 replies | 215 view(s)
-
24th February 2020, 22:04treez started a thread Adding an LC post filter can make an SMPS unstable....use RC filter instead? in Power ElectronicsAs per page 32 of the attached…. “Switch Mode power converter compensation made easy “ by Robert Sheehan ….if you design an SMPS, and you...7 replies | 215 view(s)
-
24th February 2020, 21:26its a flyback so you cant avoid the RCD clamp....if you dont like it you could do a two transistor forward instead.27 replies | 1040 view(s)
-
24th February 2020, 21:23I wonder of the trxformer is wrongly phased, and the bias outputs into vcc when your fet is on, and the turns are higher than should be also, hence...35 replies | 791 view(s)
-
24th February 2020, 21:11treez replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power ElectronicsThanks, with tan d being proprotional to Freq , that makes the ESR readings a lot lower.......taking the vishay 038 series electros......11 replies | 378 view(s)
-
24th February 2020, 11:03treez replied to a thread Need to ensure SMPS output filter has at least 10mR of ESR...use "ESR resistor"? in Power Electronicsthanks, at 20khz, I get ESR = "tan d" * Xc = 637microohms for a 1000uF cap and tan d = 0.08 and 20khz7 replies | 265 view(s)
-
24th February 2020, 08:44treez replied to a thread Need to ensure SMPS output filter has at least 10mR of ESR...use "ESR resistor"? in Power Electronicsthanks, im obviously missing something here, but wouldnt the cap with no esr placed in series with it, partially short out the esr that had been...7 replies | 265 view(s)
-
24th February 2020, 08:39treez replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power Electronicsthanks, i was wanting to do the calculation with the "tan d" figure for 20khz...but its not available......though i believe "tan d" will be less at...11 replies | 378 view(s)
-
24th February 2020, 06:52treez replied to a thread Calculating capacitor ripple current in output filter of DCDC module? in Power ElectronicsThanks, the Fsw is not stated , i agree, but i found the figure hidden on page 14 which shows the vout ripple scope shot...which looks to be about...11 replies | 378 view(s)
-
23rd February 2020, 21:58treez started a thread Impedance vs frequency plot of input filter of SMPS? in Analog Circuit DesignHi, How do I get the impedance vs frequency (fig 2.32a) plot of page 33 of the attached in LTspice?...2 replies | 182 view(s)
-
23rd February 2020, 20:27treez replied to a thread Need to ensure SMPS output filter has at least 10mR of ESR...use "ESR resistor"? in Power ElectronicsIn fact, In order to ensure that the DCDC module always effectively “sees” at least 10millOhms of ESR…could we add a series resistor into the output...7 replies | 265 view(s)
-
23rd February 2020, 18:02it sounds like the light bulb is maybe messing things up...not leaving enough voltage for the flyback startup circuit. Can you just get rid of the...35 replies | 791 view(s)
-
23rd February 2020, 17:56treez started a thread Calculating capacitor ripple current in output filter of DCDC module? in Power ElectronicsHello, We are doing an SMPS using the DCM3623T50M53C2T00 Vicor DCDC module. We need to know what is the ripple current in the external output...11 replies | 378 view(s)
-
23rd February 2020, 17:35treez started a thread Need to ensure SMPS output filter has at least 10mR of ESR...use "ESR resistor"? in Power ElectronicsHello, We are doing an SMPS using the DCM3623T50M53C2T00 Vicor DCDC module. Please assist us in getting at least 10mR of ESR in our external...7 replies | 265 view(s)
-
23rd February 2020, 17:34You probably know the next suggestion......get rid of the isolation, implement resistor divider feedback straight to the uc3844, power the uc3844...4 replies | 258 view(s)
-
23rd February 2020, 17:31Thanks, the routing situation is what i first thought, but the DCM3623T50M53C2T00 module uses "droop" sharing....(its vout decreases by some 5%,...27 replies | 1304 view(s)
-
23rd February 2020, 14:44but you seemed to say that you had 84v on a 21v zener?35 replies | 791 view(s)
-
23rd February 2020, 14:17R7, at 12k, is way too low ohmic value. Please tell what is R7?...what package and power rating? Also, what is your Z4 value....you could be...4 replies | 258 view(s)
-
23rd February 2020, 14:08So you put a 21V zener in the circuit, and the voltage at the cathode of the zener went to 84v?..........something is very wrong here....the zener...35 replies | 791 view(s)
-
23rd February 2020, 14:05Hello Page 1 of the DCM3623T50M53C2T00 datasheet states that only up to 8 modules can be placed in parallel. Why is this? Why not say, 40 in...27 replies | 1304 view(s)
-
22nd February 2020, 17:46esd damage to your uc3843? If a 150k resistor is connected to a >47uF cap at the vcc pin, it shoudl simply not be possible for the vcc voltage to...35 replies | 791 view(s)
-
22nd February 2020, 14:29Yes all the points above are valid, and especially from Klaus who has given me and many many others some fantastic electronics info in the past. But...35 replies | 791 view(s)
-
21st February 2020, 23:21treez started a thread Inductance of coile dup cbale on winch (twisted pair or just two strand) in Power ElectronicsHi, The cable seen at 4:50 of this.. https://www.youtube.com/watch?v=GzTMaXfLFb4 ..is 100m long. Since it comprises "go" and "return", the...2 replies | 216 view(s)
-
21st February 2020, 19:43I think you should use an R/ZENER/BJT startup regulator...(high voltage BJT) Diode OR it out when the bias winding gets up to voltage (also,...35 replies | 791 view(s)
-
21st February 2020, 19:41yes i believe i see your point, and in addition, it looks to me that upstream of this heavily damped inductor, there will be a need for a CLC...8 replies | 371 view(s)
-
19th February 2020, 06:44Thanks, from the Bode plot etc, the inductor is being pretty well shorted out, so i believe we will need to get rid of the 0.3R parallel resistor...8 replies | 371 view(s)
-
18th February 2020, 22:03Hi, In the Vicor DCM3623 DCDC module datasheet (below) , page 21, there is, at Figure 23, an LC input filter to some DCM3623 modules in parallel....8 replies | 371 view(s)
About treez
Basic Information
- Date of Birth
- April 5, 1982 (37)
Areas of Interest
- Area of specialization:
- Power Electronics
Optional Info
- Biography:
- cyclist
- Location:
- cambridge
- Interests:
- football, cycling
- Occupation:
- engineer
Statistics
Total Posts
- Total Posts
- 7,145
- Posts Per Day
- 1.71
General Information
- Last Activity
- Today 06:55
- Join Date
- 22nd September 2008
Helpful Postings
- Has Rated
- 5562
- Post Rated
- Rated helpful 516 out of 516 times
4 Friends
Showing Friends 1 to 4 of 4
Experience
Points
- Points
- 34,388
- Level
- 45
Level up completed
- Level up completed
- 30%
- Points required
- 1,062
Activity
- Activity
- 99.7%
- Activity last 30 days
- 99.7%
- Activity last 7 days
- 99.7%
Points
All Points for user
- Points for User
- 3,171
- Points for Reputation
- 1,043
- Points for every day since registration
- 2,116
- Points for Friends
- 12
All Points for threads
- Points for threads
- 7,444
- Points for Threads
- 1,901
- Points for tagging threads
- 2,124
- Points for replies
- 3,419
All Points for posts
- Points for Posts
- 23,772
- Points for Posts
- 21,180
- Average Posts per Day
- 1.00
- Helpful Answers
- 2,580
- Solved Threads
- 12
All Points for miscellaneous
- Points for Misc
- 0
Activities
26th February 2020
- 03:06 treez has earned 9 Points for Posts points
- 03:06 treez has earned 2 Points for threads points
25th February 2020
- 03:06 treez has earned 5 Points for threads points
- 03:06 treez has earned 3 Points for User points
- 03:06 treez has earned 29 Points for Posts points
24th February 2020
- 03:06 treez has earned 33 Points for Posts points
- 03:06 treez has earned 12 Points for threads points
23rd February 2020
- 03:05 treez has earned 3 Points for User points
- 03:05 treez has earned 11 Points for Posts points
- 03:05 treez has earned 1 Points for threads points
22nd February 2020
- 03:06 treez has earned 3 Points for User points
- 03:06 treez has earned 2 Points for threads points
- 03:06 treez has earned 14 Points for Posts points
20th February 2020
- 03:06 treez has earned 3 Points for Posts points
- 03:06 treez has earned 1 Points for threads points
19th February 2020
- 03:06 treez has earned 6 Points for Posts points
- 03:06 treez has earned 3 Points for threads points
- 03:06 treez has earned 1 Points for User points
18th February 2020
- 03:06 treez has earned 3 Points for Posts points
17th February 2020
- 03:05 treez has earned 4 Points for threads points
Show Activities from all Users