초록 ▼

In the rapid charging of a Nickel Cadmium (NiCad) battery, the rapid charging is terminated and trickle charging is initiated when any of three conditions is satisfied: a first condition determined by comparing a sensed instantaneous battery voltage with a target voltage; a second condition which is

In the rapid charging of a Nickel Cadmium (NiCad) battery, the rapid charging is terminated and trickle charging is initiated when any of three conditions is satisfied: a first condition determined by comparing a sensed instantaneous battery voltage with a target voltage; a second condition which is determined by comparing the instantaneous battery temperature with minimum and maximum values; and a third condition determined by comparing an elapsed time of rapid charging with a maximum value. Because battery voltage versus rapid charging time is a function of ambient temperature, the target voltage is determined from an initial measurement of battery temperature, which is assumed to equal the ambient temperature. The target voltage, which is approximately a linearly declining function of ambient temperature, is determined by reading a stored lookup table using the sensed temperature as an index or address.

대표청구항 ▼

[ What is claimed is:] [1.] A battery charging control device comprising:means for determining a target voltage as a function of a sensed battery temperature or a sensed ambient temperature;means for first comparing a sensed battery voltage with the determined target voltage and based on the result

[ What is claimed is:] [1.] A battery charging control device comprising:means for determining a target voltage as a function of a sensed battery temperature or a sensed ambient temperature;means for first comparing a sensed battery voltage with the determined target voltage and based on the result of the first comparing, detecting the occurrence of a first condition;means for terminating the rapid charging in response to the detection of said first condition;means for second comparing a sensed battery temperature with a predetermined maximum temperature and based on the result of the second comparing, detecting the occurrence of a second condition; wherein said terminating means is for terminating the rapid charging in response to the detection of occurrence of any of the first and said second conditions; andmeans for third comparing a sensed battery temperature with a predetermined minimum temperature and based on the result of the third comparing, detecting the occurrence of a third condition; wherein said terminating means is for terminating the rapid charging in response to the detection of occurrence of any of the first, second, and third conditions.