| 摘要 |
An automatic electric battery charging apparatus which includes terminating means comprising a bistable circuit having set and reset conditions, means for supplying a control signal dependent on battery voltage on charge through a capacitor to an input of the bistable circuit, so as to set the circuit when the battery voltage increases, capacitor charge adjusting means operative when the bistable circuit is set, for supplying current to the capacitor to adjust the charge of the latter until it re-sets the bistable circuit, a timer arranged to be reset by the bistable circuit in its set state, and means to terminate the charge or reduce the average charging current if the timer is not reset within a predetermined time. Thus the input potential to the bistable has a sawtooth waveform while the bistable is reset the capacitor charge remains unaltered, so that the bistable input potential follows that of the battery until the bistable is set. Thereupon the charge adjusting means alters the capacitor charge to change the bistable input potential in the other direction to reset the bistable again.
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