Single phase half bridge converter working help

In summary, the conversation is discussing the use of two diodes instead of two SCRs in a single phase half bridge converter. The difference it makes is that using all four SCRs may result in negative voltage output for a short duration, while using two diodes creates a freewheeling path that solves this issue. The reason for not using all four SCRs may be due to potential problems with highly reactive loads.
  • #1
electricallov
6
0
why are we using two diodes instead of two scrs in a single phase half bridge converter? What difference does it make? (say in my attachment s2 and s3 are diodes instead of scrs?)
Wont we get the same operation with two scrs itself (only thing you have to fire them together with s1 and s4). I am confused. Please help.
 
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  • #2
electricallov said:
why are we using two diodes instead of two scrs in a single phase half bridge converter? What difference does it make? (say in my attachment s2 and s3 are diodes instead of scrs?)
electricallov, your attachment is missing.
 
  • #3
Im sorry. Now I've resubmitted.
 

Attachments

  • RLload.gif
    RLload.gif
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  • #4
Hi electricallov. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

Offhand, I can't see a reason for not using 2 SCRs and 2 diodes here, at least for resistive loads. (Highly reactive loads can pose problems for SCRs, so I'd need to examine this closely to see whether that may be a consideration, especially when the L element is shown so prominently in the schematic here. :wink:)
 
Last edited by a moderator:
  • #5
In my humble opinion,
if you use all four SCRs then you would end up with negative voltage output for a short duration before s2 and s4 are triggered.
 
  • #6
GingerLee, this negative voltage concept solves everything. I did not notice the freewheeling path created when the two scrs are replaced by two diodes. This solves my question. Thanks
 

Related to Single phase half bridge converter working help

1. How does a single phase half bridge converter work?

A single phase half bridge converter works by converting AC voltage into DC voltage using a diode bridge and a capacitor. The AC voltage is first rectified by the diode bridge, and then smoothed out by the capacitor. The half bridge converter then switches the DC voltage on and off at a high frequency using a transistor, creating a pulsating DC output.

2. What components are needed for a single phase half bridge converter?

The main components needed for a single phase half bridge converter are a diode bridge, a capacitor, and a transistor. Other components such as resistors, inductors, and a control circuit may also be required depending on the specific design and application.

3. What is the advantage of using a single phase half bridge converter?

The advantage of using a single phase half bridge converter is that it is a simple and cost-effective way to convert AC voltage into DC voltage. It also allows for variable output voltage by adjusting the switching frequency of the transistor.

4. What are the applications of a single phase half bridge converter?

A single phase half bridge converter is commonly used in low power applications such as battery chargers, small power supplies, and motor control. It can also be used in renewable energy systems to convert AC voltage from solar panels or wind turbines into DC voltage for battery storage.

5. How can I troubleshoot issues with a single phase half bridge converter?

If you are experiencing problems with your single phase half bridge converter, some common troubleshooting steps include checking for loose connections, testing the components for any damage, and ensuring that the input and output voltages are within the specified range. It is also helpful to refer to the manufacturer's instructions or seek professional assistance if needed.

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