Finding the fault in this circuit (UV lamp controller)

In summary, the conversation revolves around a UV lamp controller that has been burning out occasionally. Possible reasons for this include a heavy load, running without a load, bad components, high ambient temperature, or a poorly designed circuit. The transistors in the circuit have failed and it could be due to temperature or voltage spikes. It is also noted that the schematic looks amateurish and questions are raised about its origin and design.
  • #1
engnrshyckh
51
2
TL;DR Summary
Guys this circuit and shematic is of UV lamp controller.. It burns sometime as shown in figure can someone tell the reason?
Guys this circuit and shematic is of UV lamp controller.. It burns sometime as shown in figure can someone tell the reason?
 

Attachments

  • FB_IMG_1583408658834.jpg
    FB_IMG_1583408658834.jpg
    52.4 KB · Views: 221
  • FB_IMG_1583408652669.jpg
    FB_IMG_1583408652669.jpg
    40.1 KB · Views: 191
Engineering news on Phys.org
  • #2
Is this a one time failure? From your description, 'sometimes it burns', does this mean it has happened with a replacement controller, too? Do you have UV lamp specifications you can let us see?
 
  • #3
engnrshyckh said:
Summary:: Guys this circuit and shematic is of UV lamp controller.. It burns sometime as shown in figure can someone tell the reason?

It burns sometime as shown in figure can someone tell the reason?
Several possibilities:
  • Load is too heavy (wrong lamps? high humidity?))
  • Running without a load
  • C6 bad
  • Transformer has shorted turn(s)
  • A resistor has changed value (looks like they have overheated, replace 'em)
  • Supply voltage is (occassionally?) too high
  • High ambient temperature
  • Bad design (parts under-rated for the use)
The above is roughly in order of probability. (unless it is a third-world design with a very low price; then the bad design is most likely. :wink:)
Likely a few more "maybe's."

From the looks of them, those transistors have failed shorted. Which could be temperature related (overload, shorted transformer, shorted C6) or from voltage spikes (running no-load, or open C6). Could also be a bad resistor.

Cheers,
Tom
 
  • #4
@engnrshyckh -- The schematic looks a bit amateurish. Is this a home-brew circuit? Did you design it? If not, where did you get it and the schematic?

1583505330208.png
 

Related to Finding the fault in this circuit (UV lamp controller)

1. How do I know if there is a fault in the circuit?

There are a few ways to determine if there is a fault in the circuit. One way is to use a multimeter to check for continuity and resistance in the circuit. Another way is to visually inspect the circuit for any damaged components or loose connections.

2. What are the common causes of faults in a UV lamp controller circuit?

Some common causes of faults in a UV lamp controller circuit include damaged or faulty components, loose connections, incorrect wiring, and power surges.

3. How can I troubleshoot a fault in the circuit?

To troubleshoot a fault in the circuit, you can start by checking the power supply and making sure all connections are secure. Then, you can use a multimeter to test for continuity and resistance in the circuit. If necessary, you can also replace any damaged components.

4. Can a fault in the circuit be fixed or does the entire circuit need to be replaced?

It depends on the severity of the fault. If it is a minor issue, such as a loose connection, it can usually be fixed by re-soldering or tightening the connection. However, if a major component is damaged, it may need to be replaced to fix the fault.

5. How can I prevent faults from occurring in the circuit?

To prevent faults from occurring in the circuit, it is important to use high-quality components and follow proper wiring and installation procedures. Regular maintenance and inspections can also help identify and prevent potential faults before they occur.

Similar threads

  • Electrical Engineering
Replies
5
Views
2K
  • Electrical Engineering
Replies
19
Views
1K
  • Electrical Engineering
Replies
12
Views
5K
  • Electrical Engineering
Replies
4
Views
669
  • Electrical Engineering
Replies
10
Views
4K
  • Introductory Physics Homework Help
Replies
18
Views
999
Replies
10
Views
3K
  • Electrical Engineering
Replies
3
Views
860
  • General Engineering
Replies
6
Views
2K
Replies
6
Views
3K
Back
Top