Battery charger control circuit
First Claim
1. An automatic battery charging apparatus including,means for providing a source of regulated electrical current for charging a battery,means for sensing the battery voltage at regular intervals, said means including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time,means for comparing successive average battery voltage readings,means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, andmeans responsive to said control signal for disconnecting said source of charging current from said battery.
3 Assignments
0 Petitions
Accused Products
Abstract
An automatic battery charging apparatus is provided with a regulated battery charger (15) and a control circuit (20) for monitoring the actual voltage across the battery terminals to control the operation of contactor (25). The control circuit includes means (50) for sensing the average battery voltage at regular intervals and means (55, 60) for comparing successive average battery voltage readings. Whenever the present average voltage reading differs from the previous average battery voltage reading by less than a predetermined amount, a signal (63) is applied to a circuit (65), and whenever a predetermined number of consecutive voltage readings have been detected, a logic circuit (70) causes the contactor (25) to terminate the charging operation.
76 Citations
4 Claims
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1. An automatic battery charging apparatus including,
means for providing a source of regulated electrical current for charging a battery, means for sensing the battery voltage at regular intervals, said means including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time, means for comparing successive average battery voltage readings, means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, and means responsive to said control signal for disconnecting said source of charging current from said battery.
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3. An electrical circuit for controlling the operation of a regulated battery charger in response to the state of actual charge of a battery, including
means for sensing voltage of the battery at regular intervals including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time, means for storing the digital representation of the previous average battery voltage, means for comparing the present average battery voltage with the previous average battery voltage, means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, and means responsive to said control signal for disconnecting said battery charger from said battery.
Specification