audioguru Posted September 8, 2004 Report Share Posted September 8, 2004 Hi Newguy,If you use this lab power supply to charge a Li-Ion battery then you risk having an explosion and/or a fire!.When a Li-Ion battery is fully charged, it needs a "minimum current" detector circuit to shut-off the charger. This lab power supply doesn't have a method to detect the minimum current nor a way to shut it off.If you use this lab power supply to charge a Li-Ion battery, you can set its current to charge at the regulated current that is specified for the battery.You can also set the voltage so that the battery will not charge to a higher voltage than is specified for the battery.When the battery is about 65% charged, its voltage will reach its specified maximum and the power supply's voltage regulator will keep it there. Then the battery will continue drawing current until it is fully charged and will continue drawing current as it is overcharging.When the battery is overcharging, all the current is used to heat it.Ka-boom!Another problem with using a power supply to charge a Li-Ion battery is that you must detect whether the battery's voltage is lower than its specified minimum voltage for "normal current" charging. If its voltage is low, then the initial charging current must be reduced until its voltage rises above its specified minimum voltage.Special ICs are made for battery chargers that incorporate all precautions as mentioned above, and also their circuits have back-up safety measures of maximum temperature cutoff and timer cutoff.A good article about battery chargers is in our Articles Section, here:http://www.web-ee.com/primers/files/fsect5.pdf Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.