T
treez
Guest
Hello,
Do you know of an Dual interleaving controller IC for Isolated , PFC’d Flybacks? The load would be connected to the output of the dual PFC’d flybacks, which both pour their current into the same output.
I just searched st.com, ti.com, Infineon, fairchild, analog, mps, and onsemi but none of them do it.
I appreciate that such a topology would’nt usually make sense, but this is a particular case where it would be useful.
There are plenty of Dual interleaved Boost PFC IC’s, but these are generally not suitable for “hacking” into a useage with flybacks
One reason that Dual PFC’d boost PFC IC’s are not suitable for the said flyback useage, is their lack of suitable output overload protection, and lack of suitable output short circuit protection. The above two kind of follow from the fact that Boost PFCs don’t usually connect directly to the load, so for them , short circuit protection is not as relevant…..whereas PWM controllers that serve the load directly, need the typical timeout overload protection……this “timeout” overload protection does not exist in Dual interleaved Boost PFC chips.
Also, few of the Dual interleaved Boost PFC IC’s have suitable connection for a feedback optocoupler…….this could be hacked in, but not too conveniently.
Some of the Dual interleaved Boost PFC IC’s have very lax overcurrent protection….for example, the UCC28064A needs the overcurrent sense resistor to be set for at least twice the peak current of either of the Dual Boost stages…….this would be very poor if used with flybacks that are directly connected to the load… thinking of the high staircasing of primary current that would occur in the event of an output short circuit.
(i posted similar previously , but this time it is specific to the controller, so a different post if i may, specially since the post title will spring and invite incoming interest from google searchers, thus helping the forum with extra traffic)
Do you know of an Dual interleaving controller IC for Isolated , PFC’d Flybacks? The load would be connected to the output of the dual PFC’d flybacks, which both pour their current into the same output.
I just searched st.com, ti.com, Infineon, fairchild, analog, mps, and onsemi but none of them do it.
I appreciate that such a topology would’nt usually make sense, but this is a particular case where it would be useful.
There are plenty of Dual interleaved Boost PFC IC’s, but these are generally not suitable for “hacking” into a useage with flybacks
One reason that Dual PFC’d boost PFC IC’s are not suitable for the said flyback useage, is their lack of suitable output overload protection, and lack of suitable output short circuit protection. The above two kind of follow from the fact that Boost PFCs don’t usually connect directly to the load, so for them , short circuit protection is not as relevant…..whereas PWM controllers that serve the load directly, need the typical timeout overload protection……this “timeout” overload protection does not exist in Dual interleaved Boost PFC chips.
Also, few of the Dual interleaved Boost PFC IC’s have suitable connection for a feedback optocoupler…….this could be hacked in, but not too conveniently.
Some of the Dual interleaved Boost PFC IC’s have very lax overcurrent protection….for example, the UCC28064A needs the overcurrent sense resistor to be set for at least twice the peak current of either of the Dual Boost stages…….this would be very poor if used with flybacks that are directly connected to the load… thinking of the high staircasing of primary current that would occur in the event of an output short circuit.
(i posted similar previously , but this time it is specific to the controller, so a different post if i may, specially since the post title will spring and invite incoming interest from google searchers, thus helping the forum with extra traffic)