Cutoff Load while charging the Lipo battery

Discussion in 'Power Electronics' started by Johnny1010, Jun 24, 2016.

  1. Johnny1010

    Thread Starter Member

    Jul 13, 2014
    I want to cutoff the battery from load, while charging it. Schematic of the designed circuit is attached. I have used a PNP transistor to do it. Positive terminal of the battery is connected to emitter, charger positive input is connected to base. Simulation is running good but I want to know would this circuit work in hardware? Is there any problem with the circuit?
  2. eetech00

    Active Member

    Jun 8, 2013

    Try a logic level N mosfet.
    Connect G to IC Charge pin. S to GND. Load between +V and D.
    When charging starts, mosfet shuts off and disconnects the load.
    When charging stops, mosfet turns on and connects the load.

    If not already using the charge pin to light an LED, PU charge pin thru 47k resistor to +V.