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.

single phase inverter

Status
Not open for further replies.

fadhel93

Newbie level 4
Joined
May 19, 2015
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
59
I have a project that inverts DC to AC. I have a problem as I increase the load, ripple occure in the DC bus voltage and the output signal become distorted.

hh.jpg
this is the circuit diagram
 

KlausST

Super Moderator
Staff member
Joined
Apr 17, 2014
Messages
19,428
Helped
4,297
Reputation
8,599
Reaction score
4,257
Trophy points
1,393
Activity points
128,877
Hi,

This is only a snipet of a schematic. No information about bulk capacitors, power source, current, freqzency....

And there is no question. What do you want to know?

Klaus
 

fadhel93

Newbie level 4
Joined
May 19, 2015
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
59
The power source is 70v from DC to DC converter, and the mosfet drivers are fed with 20KHz PWM from mbed microcontroller, the Inverter is designed to handle 100watt, the question is why when I increase the load, the output signal is distorted. and ripple occure in the DC bus voltage (even when I supply the inverter from bench power supply)
 

BradtheRad

Super Moderator
Staff member
Joined
Apr 1, 2011
Messages
14,000
Helped
2,789
Reputation
5,576
Reaction score
2,696
Trophy points
1,393
Location
Minneapolis, Minnesota, USA
Activity points
104,425
What pattern of Ampere waveform is drawn from your DC supply?

When the power section draws large bursts of current, many times per second, it is liable to create ripple on the supply to the control section.

It might help you diagnose the trouble if you feed separate power leads to the different sections.

Also, consider installing a large value capacitor across the power leads where they connect to your circuit board.
 

Orson Cart

Advanced Member level 3
Joined
Jun 18, 2009
Messages
800
Helped
347
Reputation
1,146
Reaction score
558
Trophy points
1,373
Location
New Zealand
Activity points
5,973
your DC source is not sufficiently powerful, you need caps across your bridge...
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top