YH11068A 45-390V High Voltage DC-DC, Schematic, Details, Tips and more!
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- While I was reorganizing my Bins that contain Partially finished or planned Designs, I saw that Little China High Voltage Current Mode Flyback DC-DC that can Deliver ca. 30W(40W with a lot of cooling) and 45-390V Single Rail or Dual Rail, depending on the Model. I have a lot of these Modules because I use the Transformer on it for another of my Designs.
I reverse Engineered it long ago and today I want to share the Design of this little China DC-DC HV Module along with Details on the Schematic.
An Introduction to Flyback Converters: Parameters, Topology, and Controllers:
www.monolithic...
Flyback Converter: www.sunpower-u...
The Role of Slope Compensation in Current-Mode-Controlled Voltage Regulators:
www.digikey.at...
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Hello from Ottawa, Ontario, Canada!
Hi Luc, Greetings from Austria/Vienna
Thanks for sharing. I use it as stabilized screen supply for push-pull 7189 pentode stereo amplifier. 300 V, 10-50 mA. Removed unnecessary bulky parts: fuse holder (replace with 40 AWG jumper wire), screw terminals, LED, trim pot (replace with 2.2K resistor), all electrolyte caps (bad quality indeed). In freed-up space added 10 uF stack of ceramic wafer filter caps, 1 mH iron powder core filter toroid, and 10 uF 450 V Nichicon second filter cap. Plus additional outboard LC filtering element. The module screwed to aluminum chassis by heat sink, with thermal paste between sink and chassis - for better cooling.
Hi Anatoly, Thankyou! Yes as I said its some Work necessary to get these Modules output "Cleaner". I would be interested to see how the 10uf Stack of Ceramics look ! What additional LC Filtering element you men/use ? My Email is in the Channel Description Tab. Cheers, Konstantin
Got this module for testing transistors for their avalanche properties (for a Jim Williams fast edge pulse generator) works nice, I only used up to 250v. Just I'll be adding a filter on the output, something at least 22uH inductor and a second capacitor, probably a few ceramics too, I don't need a lot of juice but lower noise will be nice, I didn't measured the noise but probably be way more than 10Vpp.
Hi Ruben, the LC lowpass is nessesary , I would suggest additionally a ferrite bead 1000ohm@100Mhz followed by a 10nf HV Ceramic. This Module IS noisy :-)
look forward to your design.
Which one ? My Version of the hv module or the capacitance leakage tester ?
@@KonstantinGrigoriadis My first interrest goes for the hv module. Reusing the parts for a better module with real world specoifications (without the need to cool it down to near zero Kelvin like Ali express does it). I am interested in getting the ripple voltage down to a minimum.
High Tony, the Transformer uses an EFD25/13/9 Core that will deliver Max ca. 20W(according to Magnetics Datasheet), that probably was intended for a Capacitor Charger for Photography Studio Flash(my Assumption :-).
The Transformer gets Warm when these max 20W are exceeded and bcs the transformer is probably not designed to work with a duty Cycle more then 50%, which is the case using the UC3843 Chip that goes up to almost 100% Duty.
In my Redesign of the Module for the Capacitor Leakage Tester, I will never reach these 20W. The most important is to not exceed those 20 W (the Magnetic Datasheet states it even for less 18W) and to use higher Input Voltage (19-24V Laptop PSU), to keep the Duty Cycle as near as Possible to 50% by using the Whole Secondary Winding instead only the Half !
Cheers,
Konstantin
Would also be a fine anode voltage supply for a tube circuit.
Yes but with additional Filtering only.
Very good project. I used that module in my own cap leakage tester, but have really not trusted these modules too much 😊
I have used one of these modules for a stereo PCL86 amplifier. 13V for the filament and for the converter.
But I don't trust it much. The transformer gets very hot. I think its at the limit it can handle.
I disabled the negative rail output on mine: it had less power capability than the positive out, anyway. And when I draw power from the positive out, the negative rail was climbing in voltage as it stayed unloaded, fearing capacitor explosion.
I think the transformer could be replaced by a more powerful one from an old smps, but used backwards?? One from a 12v 60+ watts?
Hello, Thankyou, this is why I designed my own Modules using the Transformer and even the Heatsink of the China Modules :-)
Cheers,
Konstantin
Hello Josep, The Transformer uses an EFD25/13/9 Core that will deliver Max ca. 20W(according to Magnetics Datasheet), that probably was intended for a Capacitor Charger for Photography Studio Flash(my Assumption :-).
The Transformer gets Warm when these max 20W are exceeded and bcs the transformer is probably not designed to work with a duty Cycle more then 50%, which is the case using the UC3843 Chip that goes up to almost 100% Duty.
In my Design I don't use the CT of the Secondary, I use the Sec in Total. As for more Power, I would make a new Design with a better Transformer made on my specs in China. I don't use Salvaged Transformers that are not available en mass(like the one of the Module, or on other Widely available Modules), bcs this makes it a one of project and I want my Designs repeatable.
But for a on off project the salvaged one would do, although UN-optimized and the SMPS from where you use the transformer must be a Flyback one(Laptop PSU for ex.), PC PSU' are mostly HalfBridge Designs or Better.
To get 300V and above I would use available (what I will show in a future Video) Aliexpress transformers for PushPull Operation >= 100W. Flyback is noisy, I prefer PushPull for Audio and RF when i need to Power HV equipment from Low Voltage.
Cheers, Konstantin
Nice project. Are there terminals/connector to read the scaled output voltage setting and cap leakage current? I was looking for something around the volt set potentiometer. I am thinking it would be nice to use the cheap Chinese LED voltmeter modules to display output voltage and current.
Hi Darren, Thankyou! The Modules of the Video are just the HV Flyback Converters for the Future Cap Leakage Design which will be MCU based and display both Set Voltage and Leakage at the Set Voltage on a LCD Display.
The Cap Leakage Tester will have switchable:
1) a 12 Pos Switch forming a Voltage Divider String for standard High Voltages
2) a 10Turn Pot to set the High Voltage Freely
2) a 12 Pos Switch forming a Voltage Divider String for standard Low Voltages < 50V or so
Cheers, Konstantin
@@KonstantinGrigoriadis I look forward to the finished design. It is something that I have wanted to build for a long time.
Why have 2 different current sensing, the chip ISence, and the slowish LM393 output???
The sense on the cs pin is to limit the current cycle by cycle as a part of the Regulation, the sensing via the 393 is used to Shut it complete down in a ocp situation like a crowbar, donno why they did it so, its redundant .
@@KonstantinGrigoriadis Oh really! :) Of course they, and I and once again spoke too soon and failed to engage my brain!.
I have always been disappointed/baffled that the UC384x series does not have built in slope compensation, ....VERY ANNOYING!
Donno Why they left it out
@@KonstantinGrigoriadis CHEAP BASTARDS, that is why :)
I have no idea, and although trivial, I still would love to know, as even back then slope compensation was very well known.