Multi mode cordless battery charger
First Claim
1. A self contained battery charger for use in charging an external battery through a pair of connecting cables, said battery charger comprising:
- an internal battery for providing a first predetermined battery voltage;
a DC to DC converter connected to the internal battery for converting said first predetermined voltage to a low current signal;
first switching circuitry for communicating said low current signal to the external battery through said terminals;
status monitoring circuitry for monitoring voltage and current conditions at the external battery;
second switching circuitry for communicating a high current signal to the external battery, in response to said status monitoring circuitry.
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Abstract
A self contained battery charger is disclosed for use in charging an external battery through a pair of connecting cables. The battery charger comprises an internal battery for providing a first predetermined battery voltage and a DC to DC converter, connected to the internal battery, for converting the first predetermined voltage to a low current signal. First switching circuitry is provided for communicating a low current signal to the external battery. Status monitoring circuitry is provided for monitoring voltage and/or current conditions when said low current signal is communicated to the external battery. Second switching circuitry is provided for communicating a high current signal to the external battery in response to sensed voltage and/or current conditions.
37 Citations
10 Claims
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1. A self contained battery charger for use in charging an external battery through a pair of connecting cables, said battery charger comprising:
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an internal battery for providing a first predetermined battery voltage; a DC to DC converter connected to the internal battery for converting said first predetermined voltage to a low current signal; first switching circuitry for communicating said low current signal to the external battery through said terminals; status monitoring circuitry for monitoring voltage and current conditions at the external battery; second switching circuitry for communicating a high current signal to the external battery, in response to said status monitoring circuitry. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A battery charger/monitoring circuit for enabling current flow between a charging battery and a battery to be charged, the circuit comprising:
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a switching circuitry connectable to the charging battery said switching circuitry being operative to alternately output to the battery to be charged one of a low current signal and a high current signal; status monitoring circuitry for monitoring current and voltage conditions when the switching circuitry is outputting said high current signal in response to said monitored current and voltage conditions. - View Dependent Claims (8, 9)
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10. The circuit as recited in claim 10 wherein said switching circuitry comprises a momentary switch operative to enable a low current path when depressed in a momentary position.
Specification