Timed voltage clamp for battery charger
First Claim
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1. A charging circuit for use with a battery having an associated temperature sensing device, the circuit comprising;
- power supply means for supplying DC power to the battery;
switching means for controlling the level of power supplied by the power supply means to the battery in response to a control signal;
a first control circuit coupled to supply a first control signal to the switching means in response to a predetermined battery temperature sensed by the sensing device;
a second control circuit coupled to supply a second control signal to the switching means in response to a predetermined battery voltage; and
timing means for enabling the second control circuit for a predetermined time period, said period beginning at the start of each charge cycle.
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Abstract
A battery charging device wherein the charging current level is controllable by a thermal circuit responsive to battery temperature also includes a circuit responsive to battery voltage and a timing circuit. The timing circuit is activated when a battery is inserted into the device for charging and immediately times a very brief interval. If the battery voltage exceeds a predetermined level during the timed interval, the charging current level is reduced as by the thermal circuit. The circuit protects both cold and charged batteries from damage due to overcharging.
41 Citations
7 Claims
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1. A charging circuit for use with a battery having an associated temperature sensing device, the circuit comprising;
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power supply means for supplying DC power to the battery; switching means for controlling the level of power supplied by the power supply means to the battery in response to a control signal; a first control circuit coupled to supply a first control signal to the switching means in response to a predetermined battery temperature sensed by the sensing device; a second control circuit coupled to supply a second control signal to the switching means in response to a predetermined battery voltage; and timing means for enabling the second control circuit for a predetermined time period, said period beginning at the start of each charge cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification