choke input power supply filter - Page 5

nicoch58 · 20th January 2012, 12:10 AM

Quote:

Originally Posted by Roscoe Primrose

That's a common-mode choke, and not suitable as a PS filter in this application.

Roscoe

nope common mode type choke work even better in psu....

Roscoe Primrose · 20th January 2012, 12:26 AM

A core that size, especially a toroid, isn't going to handle anywhere near that much current...

Try the Hammond 159ZE, a bit pricey, but well worth the money...

Roscoe

Zen Mod · 20th January 2012, 01:18 AM

differential mode choke ( big one ) is the way to go

flux cancellation blahblah

Fuzzy ZM

jtsaudio · 24th January 2012, 08:40 AM

Quote:

differential mode choke ( big one ) is the way to go

How "big" would be the smallest recommended for 3A per channel current capability?

THX,

-Joe

Roscoe Primrose · 24th January 2012, 01:16 PM

About the size of the previously mentioned Hammond 159ZE....

Roscoe

Zen Mod · 24th January 2012, 02:21 PM

big in value , or big in size ?

lookielookie : The NEM AI-50

observe value of L2

hop to 6moon article , read , study CRO photos

use PSUD to decide what's enough for your particular case

jtsaudio · 26th January 2012, 05:26 AM

Quote:

About the size of the previously mentioned Hammond 159ZE....

Digikey's website shows the 159ZE as L= 28mH, Imax =3A and R= 0.43 ohms, and costing $28 and weighing almost three pounds!

Since NP suggests 1.5-2.2mH, I will continue looking for a suitable surplus toroidal unit...

-Joe

nicoch58 · 27th January 2012, 10:57 PM

RR#002 - DC Filament Supply Test

Loudthud · 28th January 2012, 05:26 AM

I've been running a lot of PSUD simulations recently on choke input filters. Sometimes I get a warning that the rectifier reverse voltage has been exceeded. The voltage spike comes right at the zero crossing of the transformer voltage.

Usually the big peak in transformer current comes after the transformer voltage peak. (Current lags voltage in an inductor.) If you get the load current and capacitance just right, the current peak is very near the center of the voltage peak and looks like the current peak you normally see with capacitor input filters. No spikes. If you put a smallish capacitor on the rectifier side of the choke, you can increase the voltage between the choke input value and the cap input value. The problem becomes finding a cap that can withstand the ripple current.

Power factors (power out/power in) run about 60-65% with cap only or CLC filters. About 10% higher with LC filters.

Note: To get PSUD to spit out valid RMS numbers, run the simulation for 100mS to get 5 complete cycles at 50Hz or 6 complete cycles at 60Hz. Then you get pretty good numbers for the currents in all the components. There is also a feature that lets you calculate the transformers bulk impedance from the winding resistances and no load voltages.

I use a 2 second delay, but you can get a big voltage spike at turn on. Check what goes on with zero delay. I guess I'll be shopping for thermistors soon.

jtsaudio · 05:41 PM

Quote:

I guess I'll be shopping for thermistors soon

Absolutely. Thermistors were specified by Mr. Pass in my PSU circuit.

Does PSUD simulate use of one CL 60 on each primary line lead to traf?

If so, how does this affect the peak voltage on rectifier(s)?

Thx,

-Joe

P.S. Loudthud:If you want I can send you a spare pair of CL60 I have lying around(PM me).

20th January 2012, 01:18 AM	#43
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	differential mode choke ( big one ) is the way to go flux cancellation blahblah Fuzzy ZM __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

24th January 2012, 02:21 PM	#46
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	big in value , or big in size ? lookielookie : The NEM AI-50 observe value of L2 hop to 6moon article , read , study CRO photos use PSUD to decide what's enough for your particular case __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

27th January 2012, 10:57 PM	#48
nicoch58 diyAudio Member Join Date: Oct 2004	nice info RR#002 - DC Filament Supply Test __________________ Sic58

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Choke input power supply, capacitor ratings	00940	Tubes / Valves	14	7th July 2009 05:52 PM
Choke Input Filter.	G	Tubes / Valves	8	11th February 2008 08:57 PM
Using Choke in LCRC filter in power supply	vangogh-hk	Tubes / Valves	5	24th November 2005 05:21 PM
SOZ Choke input filter?	gnomus	Pass Labs	48	14th May 2004 06:41 PM
Choke input Power Supply	NickC	Solid State	4	6th November 2002 07:41 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th January 2012, 12:26 AM	#42
Roscoe Primrose Do you smell smoke? diyAudio Member Join Date: Jan 2004 Location: Virginia, USA	A core that size, especially a toroid, isn't going to handle anywhere near that much current... Try the Hammond 159ZE, a bit pricey, but well worth the money... Roscoe

24th January 2012, 01:16 PM	#45
Roscoe Primrose Do you smell smoke? diyAudio Member Join Date: Jan 2004 Location: Virginia, USA	About the size of the previously mentioned Hammond 159ZE.... Roscoe

28th January 2012, 05:26 AM	#49
Loudthud diyAudio Member Join Date: Nov 2007 Location: Near Dallas Texas USA	I've been running a lot of PSUD simulations recently on choke input filters. Sometimes I get a warning that the rectifier reverse voltage has been exceeded. The voltage spike comes right at the zero crossing of the transformer voltage. Usually the big peak in transformer current comes after the transformer voltage peak. (Current lags voltage in an inductor.) If you get the load current and capacitance just right, the current peak is very near the center of the voltage peak and looks like the current peak you normally see with capacitor input filters. No spikes. If you put a smallish capacitor on the rectifier side of the choke, you can increase the voltage between the choke input value and the cap input value. The problem becomes finding a cap that can withstand the ripple current. Power factors (power out/power in) run about 60-65% with cap only or CLC filters. About 10% higher with LC filters. Note: To get PSUD to spit out valid RMS numbers, run the simulation for 100mS to get 5 complete cycles at 50Hz or 6 complete cycles at 60Hz. Then you get pretty good numbers for the currents in all the components. There is also a feature that lets you calculate the transformers bulk impedance from the winding resistances and no load voltages. I use a 2 second delay, but you can get a big voltage spike at turn on. Check what goes on with zero delay. I guess I'll be shopping for thermistors soon.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read