Hello,
I need some help specifying a transformer. It will be used to power a music server. The idea is to use a dual winding transformer, and feed one of the secondaries into an Evotronix single active power supply (seen at the bottom of this page). I attached a schematic of the circuit. This will in turn feed unregulated power to an HDPlex 400W DC-ATX converter that will power the motherboard and CPU. The HDPlex accepts input voltage of 16-30Vdc.
The other secondary will feed into an Evotronix Zeno MKII linear power supply, which will power a network card that accepts 5V 2A. I attached a schematic of the Zeno MKII as well.
The single active power supply uses a FWB rectifier with input cap, so I think I understand peak DC voltage will be 1.414 X Vac at zero load and before diode voltage drop. Where I'm confused is how current will be affected. The Hammond rectifier design guide says DC current will be .62 X the secondary AC current. Say I have a 20Vac 10A secondary. After feeding it through the single active power supply, will I get 28.28Vdc 6.2A? I would like to supply the HDPlex with 20-28Vdc 10A. Would I need a secondary rated at 16A (10/.62=16.129)?
On to the other secondary. The Zeno MKII looks like it uses a half wave rectifier. The Hammond guide says DC current is .28 X the secondary AC current for this load. The goal is 5Vdc 2A to power the network card. Would this secondary need to be rated at 7A (2/.28=7.14)? The Zeno is rated up to 4A continuous, so would this cause any issues?
FWIW, estimated power consumption of this server under load is 200-220W. I've also read computers represent a non-linear load with lots of instantaneous peaks, which confuses me even more.
Sorry if I posted this in the wrong section. I'm not very knowledgeable about circuits but would like to learn. Thanks for the help.
I need some help specifying a transformer. It will be used to power a music server. The idea is to use a dual winding transformer, and feed one of the secondaries into an Evotronix single active power supply (seen at the bottom of this page). I attached a schematic of the circuit. This will in turn feed unregulated power to an HDPlex 400W DC-ATX converter that will power the motherboard and CPU. The HDPlex accepts input voltage of 16-30Vdc.
The other secondary will feed into an Evotronix Zeno MKII linear power supply, which will power a network card that accepts 5V 2A. I attached a schematic of the Zeno MKII as well.
The single active power supply uses a FWB rectifier with input cap, so I think I understand peak DC voltage will be 1.414 X Vac at zero load and before diode voltage drop. Where I'm confused is how current will be affected. The Hammond rectifier design guide says DC current will be .62 X the secondary AC current. Say I have a 20Vac 10A secondary. After feeding it through the single active power supply, will I get 28.28Vdc 6.2A? I would like to supply the HDPlex with 20-28Vdc 10A. Would I need a secondary rated at 16A (10/.62=16.129)?
On to the other secondary. The Zeno MKII looks like it uses a half wave rectifier. The Hammond guide says DC current is .28 X the secondary AC current for this load. The goal is 5Vdc 2A to power the network card. Would this secondary need to be rated at 7A (2/.28=7.14)? The Zeno is rated up to 4A continuous, so would this cause any issues?
FWIW, estimated power consumption of this server under load is 200-220W. I've also read computers represent a non-linear load with lots of instantaneous peaks, which confuses me even more.
Sorry if I posted this in the wrong section. I'm not very knowledgeable about circuits but would like to learn. Thanks for the help.
Attachments
Hi ,why do you chose linear power supplies for things on Iike server or pc ? Those are fine with smps , and you will have less heat and power consumption . Linear needed only when directly related to audio - preamplifier , dac ,adc ...