uoficowboy
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Hi - can somebody tell me what advantages/disadvantages flybacks, push-pull, and forward converter DC/DCs have with respect to each other?
Here's my attempt:
Flyback:
+lowest part count (1 primary switch, 1 diode)
-inductor is typically larger, I think (since you're storing energy)
-Susceptible to ringing on primary
Push-pull:
-Highest part count (4 switches, 4 diodes)
-Most losses in signal path (current in primary flows through two switches, current in secondary flows through two diodes)
+transformer is smaller than flyback, I think
+least ringing on primary (this is a educated guess!)
-Output voltage is dependent on your transformer turns ratio
Forward converter
~less parts than push pull, more than flyback (1 switch, 2 diodes)
~transformer is a bit larger than push pull (I think)
-More ringing on primary than push pull, not sure about flyback
-Output voltage is dependent on your transformer turns ratio
How am I doing so far?
I should mention my eventual interest is in making a high Vout/Vin ratio DC/DC. Something like 5V to 1KV. But I'm also interested in comparing these topologies in the general sense.
Thanks!!
Here's my attempt:
Flyback:
+lowest part count (1 primary switch, 1 diode)
-inductor is typically larger, I think (since you're storing energy)
-Susceptible to ringing on primary
Push-pull:
-Highest part count (4 switches, 4 diodes)
-Most losses in signal path (current in primary flows through two switches, current in secondary flows through two diodes)
+transformer is smaller than flyback, I think
+least ringing on primary (this is a educated guess!)
-Output voltage is dependent on your transformer turns ratio
Forward converter
~less parts than push pull, more than flyback (1 switch, 2 diodes)
~transformer is a bit larger than push pull (I think)
-More ringing on primary than push pull, not sure about flyback
-Output voltage is dependent on your transformer turns ratio
How am I doing so far?
I should mention my eventual interest is in making a high Vout/Vin ratio DC/DC. Something like 5V to 1KV. But I'm also interested in comparing these topologies in the general sense.
Thanks!!