| Electronics > Projects, Designs, and Technical Stuff |
| Holding voltage under load with buck boost converter |
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| BernieX:
I have built a 3D printer. It is powered by a 24vdc/20amp AC line powered supply. The 24vdc output is split to first power the heat bed of the printer at the full 24vdc and second feeds into a 24vdc to 12vdc buck boost unit. The 12vdc feeds the control board-computer to intern operate stepper motors and heat the hot extruder end. When the printer is operating I am not getting the heat at the hot end (powered by the 12vdc coming from the buck boost) that I feel is due to voltage drop. When heating the voltage at the output of the buck boost drops from 12.7 when not heating to 7.8vdc. Is there a buck boost unit available that will not loose voltage under load or is this a primary power feed problem—(the 24vdc power supply is to small)? The heating element inside the hot end draws 2.6 amps when powered by an independent bench supply at 12vdc. Thank you. :rant: |
| ejeffrey:
What is the 12 V buck-boost rated for? There certainly exist 24->12 V supplies that can handle that much load. Is this a commercial supply? Was it designed to go with this 3D printer or did you just use a random supply you had around? Have you modified the printer? If the power supply is part of a system designed to work together it should be rated high enough. It might be that something in the controller is broken and drawing a large fault current causing the voltage drop. It seems unlikely that it is a problem with your 24V supply but you should definitely measure the 24 V rail with everything on to see if it is dropping a lot. |
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