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Battery for stepper motors and controller

balearicdynamics

Hi to all. The scenario is the following: by one side there is a couple of stepper motors (running on 4.5 Vcc.) and by the other there is the 5 Vcc needed to power the controller board (consuming very few current, i.e. 150 mA). So, there will be two different power lines. To get them from a single battery (e.g. 2A LiIon rechargeable battery), is it sufficient splitting the battery power supply, one to the motors and one to a 5V power regulator to power the controller?

 

Thank you in advance image Enrico

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    It is a little more expensive to implement because now another supply is needed, it is more trouble, more space and more money.  The consumer market gets some rather poor circuits because the market is so cost-sensitive.  Optoisolators and similar circuits are fairly ubiquitous in medical electronics, for example, because the market is professional and not so hyper-reactive to cost.  These are interesting circuits.  I am not telling you to use them so much as to encourage you to read the highly-rewarding application notes about them, then decide for yourself.  They have products nowadays called 'logic optoisolators' that require a minimum of design effort to implement. Opto-isolators are a little less popular now because bandwidth and circuits they protect are a little more robust by nature now.  There are other forms of isolators that use acoustic or RF energy instead of light that are used in special cases.  Transformers can also be used in some cases to minimize the energetic transfer across a barrier.

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    It is a little more expensive to implement because now another supply is needed, it is more trouble, more space and more money.  The consumer market gets some rather poor circuits because the market is so cost-sensitive.  Optoisolators and similar circuits are fairly ubiquitous in medical electronics, for example, because the market is professional and not so hyper-reactive to cost.  These are interesting circuits.  I am not telling you to use them so much as to encourage you to read the highly-rewarding application notes about them, then decide for yourself.  They have products nowadays called 'logic optoisolators' that require a minimum of design effort to implement. Opto-isolators are a little less popular now because bandwidth and circuits they protect are a little more robust by nature now.  There are other forms of isolators that use acoustic or RF energy instead of light that are used in special cases.  Transformers can also be used in some cases to minimize the energetic transfer across a barrier.

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