Battery Consumption and Power Drainage.

Discussion in 'Power Electronics' started by dou2abou, Sep 25, 2016.

  1. dou2abou

    Thread Starter New Member

    Sep 25, 2016
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    0
    Hello,
    I'm trying to power an 18F4550 (PIC 3) which is a microcontroller that requires 5 Volts of power. Since I'm not an expert when it comes to electronics, here's my idea of how to do it.

    - Use a 5V voltage regulator.
    - Use a capacitor to provide a clear signal.

    Question is:
    - If I use a 5V voltage regulator, what would be the difference between using a battery that provides 6V or more? In other words, would using a 6V battery or a 11V battery make any difference? or does it simply mean that my 11V battery would last longer than a 6V battery?
    - How do I figure out how long my battery would last?
    - If the voltage regulator's job is to regulate voltage, do I still need to use a capacitor to provide a clear signal? If so, how do I pick my capacitor?

    Thank you for your patience.
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    6,046
    1,168
    Welcome to AAC!
    It depends on the type of regulator. A 6V battery would require either a 'low drop-out' linear regulator or a switched mode (SM) regulator. A linear regulator with an 11V battery would waste a lot of energy.
    Not necessarily. The duration depends on the capacity, i.e. ampere-hour (Ah) value, of the battery. For example, a 1Ah (1000mAh) battery will (in theory) supply a 10mA load for 1000mAh/10mA = 100 hours.
    You read the regulator's datasheet to find the recommended capacitor value.
     
    dou2abou likes this.
  3. dou2abou

    Thread Starter New Member

    Sep 25, 2016
    2
    0
    Thank you for your answer.
     
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