Continue to Site

Welcome to EDAboard.com

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.

Register Log in

[SOLVED] 12v 1000w pure sine wave inverter fault

Status
Not open for further replies.
B

byronboy

Newbie level 4
Joined
Jan 4, 2013
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,323
Hi Guys. I,m in the middle of repairing a skytronic 12v 1000w pure sine wave inverter which originally came in with no AC output.With no circuit diagram to hand it can be tricky to fault find.The no output problem was caused by two s/c irf740s ,two s/c irf3205 mosfets,a s/c smd transistor and o/c 100 ohm smd resistor,both in the drive of one of the irf740s.This got it up and running but with 200v reading instead of 230v.It appears to use 3 switch-mode transformer circuits in a parallel configuration using a KA3525 smps controller ic.
LM324 quad high gain op amp ic.
EM78P458 8bit micro processor.
Any help would be appreciated.
Regards, Peter.
 

Check for DC bus voltage which shoud be around 310V. Find the regulation loop going to KA3525 from here. See if you can adjust.
 

ALERTLINKS said:
Check for DC bus voltage which shoud be around 310V. Find the regulation loop going to KA3525 from here. See if you can adjust.
Click to expand...

Hi.
After a quick voltage check on the KA3525 smps ic,I decided to change it.This in fact cured the lower than normal output reading and is now spot on.
Many thanks for your assistance.
Regards, Peter.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top