Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Regarding the PFC concerns, this particular power supply is meant to work with a Servo drive that does not have it's own DC bus. It's a fairly common drive and I can certainly guarantee 90% of the users of the drive do not gu through trying to implement a PFC circuit. Caps, a recifier, an inrush...
Whether PFC is absolutely necessary or not, I'm not sure. I have used the setup of some caps with a rectifier and some contactors for over a year. Not that it's a bad idea, I'm just not sure I have the experience to implement it. I did spend a bit of time looking at a TI PFC chip and calculating...
I realize that the idea of the resistor or NTC in parallel with the triac defeats the purpose of the triac. The triac is there as the "switch" that turns on the power supply, running the current limiter in parallel with the triac would be using the triac as the bypass and require an external on...
Hmm, how about putting the NTC in parallel with the triac rather than resistors,The NTC has the advantage of reducing it's own resistance if something goes wrong where the resistor remains a heater until it burns up.
It was never the intention to "leave the thermister in the path the whole...
Not really sure what I would use as an external power supply, again trying to keep everything self contained.
If you omit the IGBT from the drawing there, the only actual issue with the DC bus side is the after the caps have charged the NTC should not really remain in the circuit as it will...
Prefer not to use a relay if possible. If I were to use a relay the NTC has to go on the line side since I have found no PCB mount relays that can handle the DC voltage/current. Not using any off-board contactors/relays.
Yes but one line remains live to the rectifier, I may remove the second...
I'm trying to design a self contained DC bus power supply. Specifically it's for a 400v 2200w AC servo drive. Trying to get this all down on 1 PCB for simplicity. I've been using this drive for some time with just 240v mains rectified to 340vDC and some filter caps. The inrush current on...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
