HIGH CURRENT VOLTAGE REGULATOR
- Thread starter HEALEY
- Start date
Hello,
There's a circuit at http://www.edn.com/article/CA434875.html that shows how to parallel integrated regulators. If you used LM350, at 3 amps each you would need 25 of them, plus diodes, capacitors. Also, as all ICs share the common terminal (tab in TO220, case in TO-3 package) they can be mounted on a single heatsink. Take note that for 25 devices, regulation terminal current amounts to 25X100uA=2.5 mA. Also, the circuit shown by EDN uses fixed regulators, common tab to ground, whereas using LM350 which needs two resistors to adjust voltage output you would need a common resistor coming out from the heatsink. Using a switching regulator with MOSFET pass transistor you might reduce power dissipation and size; don't know how to, but at the factory floor we use 24V 40A switching PSUs.
Best regards
There's a circuit at http://www.edn.com/article/CA434875.html that shows how to parallel integrated regulators. If you used LM350, at 3 amps each you would need 25 of them, plus diodes, capacitors. Also, as all ICs share the common terminal (tab in TO220, case in TO-3 package) they can be mounted on a single heatsink. Take note that for 25 devices, regulation terminal current amounts to 25X100uA=2.5 mA. Also, the circuit shown by EDN uses fixed regulators, common tab to ground, whereas using LM350 which needs two resistors to adjust voltage output you would need a common resistor coming out from the heatsink. Using a switching regulator with MOSFET pass transistor you might reduce power dissipation and size; don't know how to, but at the factory floor we use 24V 40A switching PSUs.
Best regards
Hi there,
Check circuits and also some theory about PWM regulation at
http://www.edn.com/contents/images/31600di.pdf dimmer
http://us.st.com/stonline/books/pdf/docs/3566.pdf dimmer
http://users.pandora.be/educypedia/electro...uitsbypower.htm
You can regulate the secondary side, using low voltage, high current MOSFETS - IRFZ44 - or regulate the primary side, using a TRIAC. I can remember repairing a little beast at a mechanic's shop; it regulated the primary side of thr transformer using a VERY SIMPLE triac circuit and rectifying the secondary with many diodes in parallel. This thing was used to charge 24/48 V batteries, also as a starter for truck motors. It was too simplistic, missed current sharing resistors in series with each diode at the secondary side. Maybe you could try a similar idea and improving upon the thery at the preceding links.
Best regards
Check circuits and also some theory about PWM regulation at
http://www.edn.com/contents/images/31600di.pdf dimmer
http://us.st.com/stonline/books/pdf/docs/3566.pdf dimmer
http://users.pandora.be/educypedia/electro...uitsbypower.htm
You can regulate the secondary side, using low voltage, high current MOSFETS - IRFZ44 - or regulate the primary side, using a TRIAC. I can remember repairing a little beast at a mechanic's shop; it regulated the primary side of thr transformer using a VERY SIMPLE triac circuit and rectifying the secondary with many diodes in parallel. This thing was used to charge 24/48 V batteries, also as a starter for truck motors. It was too simplistic, missed current sharing resistors in series with each diode at the secondary side. Maybe you could try a similar idea and improving upon the thery at the preceding links.
Best regards
Here's where you can get schematics for ASTRON regulated 12-14VDC power supplies up to 75A. They are fairly well designed. You'd be interested in their output PASS transistor configurations.
http://www.repeater-builder.com/rbtip/astron-index.html
http://www.repeater-builder.com/rbtip/astron-index.html
Ther's a list of high current diodes at http://www.dacosemi.com.tw/pdf/Standard%20...very%20DO-5.pdf
Best regards
Best regards
