Constant current, fast and float rate, variable hysteresis battery charger
First Claim
1. A battery charging circuit connected to a voltage source and the terminals of a battery for maintaining a charge on the battery comprising:
- input means connected to said voltage source;
current regulating means connected to said input means for providing a constant current output to said battery;
resistive means connected to said regulating means for selectively setting charging rate currents provided to said battery by said regulating means;
switching means connected to said resistive means for controlling the operation of said resistive means;
means for sensing the state of charge of said battery connected across the terminals of said battery; and
integrated buffer circuit means connected between sensing means and said switching means to control the operation of said switching means in response to the state of battery charge sensed by said sensing means.
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Accused Products
Abstract
A battery charger of the type which provides a constant current charge for charging batteries which may be used to charge batteries having a wide range of voltages and capacities. The charging circuit of the constant current battery charger of the present invention includes a conventional voltage source, three terminal regulators, fast and float charging rate resistors, a resistive divider for sensing battery voltage and integrated circuit means for providing drive current for a switching relay and for providing hysteresis. The circuit provides ready and complete adjustability of voltage range, fast and float current ranges and switching hysteresis range wherein these ranges are defined by linear relationships and may be changed by substituting passive components such as resistors.
14 Citations
8 Claims
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1. A battery charging circuit connected to a voltage source and the terminals of a battery for maintaining a charge on the battery comprising:
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input means connected to said voltage source; current regulating means connected to said input means for providing a constant current output to said battery; resistive means connected to said regulating means for selectively setting charging rate currents provided to said battery by said regulating means; switching means connected to said resistive means for controlling the operation of said resistive means; means for sensing the state of charge of said battery connected across the terminals of said battery; and integrated buffer circuit means connected between sensing means and said switching means to control the operation of said switching means in response to the state of battery charge sensed by said sensing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification