Versatile Micropower Battery Protector


Posted on Feb 7, 2014

Back in May 2002, we (Silicon Chip) presented the `Battery Guardian`, a project designed specifically for protecting 12V car batteries from over-discharge. This unit has proven to be very popular and is still available from kit suppliers. This new design does not supersede the Battery Guardian at least not when it comes to 12V car batteries. I


Versatile Micropower Battery Protector
Click here to download the full size of the above Circuit.

nstead, it`s a more flexible alternative that can be used with a wide range of battery voltages. In this new "Micropower Battery Protector", we`ve dispensed with the low-battery warning circuitry and the relatively cheap N-channel MOSFET used in the Battery Guardian in favour of a physically smaller module that steals much less battery power. It costs a little more but can switch lower voltages, allowing it to be used with 6V & 12V lead-acid batteries and 4-cell to 10-cell NiCd and NiMH battery packs. Most battery-powered equipment provides no mechanism for disconnecting the batteries when they`re exhausted. Even when the voltage drops too low for normal operation, battery drain usually continues until all available energy is expended. This is particularly true of equipment designed to be powered from alkaline or carbon cells but retro-fitted with rechargeables. Another example is emergency lighting and security equipment designed to be float-charged from the mains. In an extended blackout period, the batteries can be completely drained and may not recover when the mains power is finally restored.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Air Ioniser circuit
    Rgb-video-amplifier
    Radio alarm clock
    TESLA COIL BUILT
    Line Bal Test Meter
    Solar Panel Optimizing Battery Charger
    AD7730 digital pressure measuring circuit
    Stepping HM4246 touch dimmer light circuit



    Top