I am fairly new to electronics as a hoby, so please bare with me.
I am building a project to run a bow thruster control system in a yacht which has a 12V battery bank. In essence the project has four substantial blocks
1) An MCU (ESP32) that controls logic of timing, relay switching delays and some bluetooth functionality.
2) A number of opto isolated signals to control the truster relays. These signals use very little current so can be driven directly off the MCU.
3) Power supply circuitry that protects, regulates and filters the potential noisey electrical environment due to the relay swithcing and inductive bow thruster motor.
4) A cntrol panel board with LED backlighting (expected 60mA max).
Up until now I have focused on a power supply using a DC/DC converter (XL1509-3.3) to provide a low noise supply for the MCU at 3.3V.
I now find that I also need a steady 12V rail for back lighting etc. The voltage from the battery bank can swing from something like 10 - 15 Volts - I guess)
So my question is - what is the best apprach to supply these two rails.
Should I,
1) Create a seperate 12V rail using another DC/DC converter (I guess would need to be Buck/Bost) and associated circuity.
2) Create a primary 12V rail using changing the existing DC/DC converter to a XL1509-12 and then use something like a 3.3V linear regulator to provide the logic level voltage.
3) Some other approach.
A couple of notes:
1) Board space is getting a little cramped due to some mechanical constraints of the project so I want to use as small footprints as is reasonably possible.
2) One of my mechanical constraints is depth of components so if possible I want to use SMD's
3) I am trying to keep as noise free as possible.
I would be interested in your thoughts as to how you would approach such power supply requirements.
Craig
I am building a project to run a bow thruster control system in a yacht which has a 12V battery bank. In essence the project has four substantial blocks
1) An MCU (ESP32) that controls logic of timing, relay switching delays and some bluetooth functionality.
2) A number of opto isolated signals to control the truster relays. These signals use very little current so can be driven directly off the MCU.
3) Power supply circuitry that protects, regulates and filters the potential noisey electrical environment due to the relay swithcing and inductive bow thruster motor.
4) A cntrol panel board with LED backlighting (expected 60mA max).
Up until now I have focused on a power supply using a DC/DC converter (XL1509-3.3) to provide a low noise supply for the MCU at 3.3V.
I now find that I also need a steady 12V rail for back lighting etc. The voltage from the battery bank can swing from something like 10 - 15 Volts - I guess)
So my question is - what is the best apprach to supply these two rails.
Should I,
1) Create a seperate 12V rail using another DC/DC converter (I guess would need to be Buck/Bost) and associated circuity.
2) Create a primary 12V rail using changing the existing DC/DC converter to a XL1509-12 and then use something like a 3.3V linear regulator to provide the logic level voltage.
3) Some other approach.
A couple of notes:
1) Board space is getting a little cramped due to some mechanical constraints of the project so I want to use as small footprints as is reasonably possible.
2) One of my mechanical constraints is depth of components so if possible I want to use SMD's
3) I am trying to keep as noise free as possible.
I would be interested in your thoughts as to how you would approach such power supply requirements.
Craig