LOW COST BATTERY CHARGER WITH VARIABLE CHARGE RATE
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-13
The Personal Cordless Phone presents an unusual charging problem, that is, selecting the minimum charging current for the internal batteries that will maximize the battery cell life. In home use the Cord- less Phone is stored in its charging cradle at all times except when making a phone call. If the Cordless Phone is used for home and business use, it is removed from the charging cradle in the morning and not returned until the end of the day, possibly 12 to 14 hours later. In the first case little energy is removed from the battery but, in the second case the battery energy is nearly depleted. If the charge current is set for the worst case usage, the charge rate for home usage is too high. Similarly, if the rate is set for home usage, the battery will not fully charge over night.