Automatic electric battery charging apparatus
First Claim
1. Automatic electric battery charging apparatus of the taper charge type for supplying a direct charging current to battery terminals from a.c. supply terminals, comprising:
- means for generating a control signal representative of the difference between a first signal dependent on the battery voltage and a second signal dependent on the a.c. supply voltage; and
terminating means responsive to the rate of rise of said control signal for initiating the termination of a phase of the charge when the rate of rise of said control signal falls below a predetermined value.
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Abstract
An automatic battery charger of taper type has means for comparing a reference signal with a control signal varying with battery voltage, and terminating the charge when the rate of rise of battery voltage falls below a predetermined value. To prevent spurious operation due to mains voltage variation, the control signal comprises the difference between a signal dependent on battery voltage and a signal dependent on a.c. supply voltage.
The rate of rise of the control signal is monitored by comparing it with a staircase reference voltage which is increased by a step whenever the control signal exceeds it, and termination is initiated if the time interval between two steps exceeds a given period. This may be long enough, e.g. half an hour, to provide an equalizing charge without requiring additional equipment.
22 Citations
18 Claims
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1. Automatic electric battery charging apparatus of the taper charge type for supplying a direct charging current to battery terminals from a.c. supply terminals, comprising:
- means for generating a control signal representative of the difference between a first signal dependent on the battery voltage and a second signal dependent on the a.c. supply voltage; and
terminating means responsive to the rate of rise of said control signal for initiating the termination of a phase of the charge when the rate of rise of said control signal falls below a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- means for generating a control signal representative of the difference between a first signal dependent on the battery voltage and a second signal dependent on the a.c. supply voltage; and
Specification