Battery charging apparatus
First Claim
1. A battery charging apparatus which comprises:
- (a) voltage source means for forming a DC charging current at a specified voltage to be applied to charge a battery;
(b) a discharge circuit which connects from the positive terminal of a battery comprising a switch and a solid state controlled resistor means to selectively and controllably discharge the battery;
(c) a charging circuit utilizing said voltage source connected in series with the battery and said solid state controlled resistor means to controllably charge the battery; and
(d) wherein said solid state controlled resistor means comprises a differential amplifier circuit comparing two values to form a control voltage for control of said resistor means wherein said two values are derived from a set value and a value related to the charge condition of the battery.
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Accused Products
Abstract
A battery charging and analyzing apparatus for a nickel-cadmium battery is disclosed. The equipment utilizes a type of solid state resistor formed of a plurality of paralleled emitter follower transistors which are collectively a load for a Ni-Cid battery. The apparatus senses the requirements for charge and adjusts a control voltage which is compared with a reference voltage. The control voltage is applied to a circuit which conditions a signal to adjust the conductivity of the emitter follower transistors as required. When the device is switched on or off by the application of power, charging or discharging through the solid state resistor (SSR) is accomplished. This is accomplished over a timed interval.
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Citations
19 Claims
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1. A battery charging apparatus which comprises:
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(a) voltage source means for forming a DC charging current at a specified voltage to be applied to charge a battery; (b) a discharge circuit which connects from the positive terminal of a battery comprising a switch and a solid state controlled resistor means to selectively and controllably discharge the battery; (c) a charging circuit utilizing said voltage source connected in series with the battery and said solid state controlled resistor means to controllably charge the battery; and (d) wherein said solid state controlled resistor means comprises a differential amplifier circuit comparing two values to form a control voltage for control of said resistor means wherein said two values are derived from a set value and a value related to the charge condition of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery charging apparatus which comprises:
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(a) voltage source means for forming a DC charging current at a specified voltage to be applied to charge a battery; (d) a discharge circuit which connects from the positive terminal of a battery comprising a switch and a solid state controlled resistor means to selectively and controllably discharge the battery; (c) a charging circuit utilizing said voltage source connected in series with the battery and said solid state resistor means to controllably charge the battery; (d) wherein said solid state controlled resistor means comprises; (1) a base driven serially connected transistor and resistor connected together; (2) means for forming a control voltage for the base of said transistor, (3) which means comprises a comparator circuit means having two inputs, (i) one of which is a selected reference signal, and (ii) the other is a voltage level proportional to current flow through said solid state resistor; and (e) a series sampling resistor connected in said solid state controlled resistor means such that the current flow is directed through the sampling resistor to form a voltage drop thereacross which is input to said comparator circuit means. - View Dependent Claims (9, 10, 11, 12)
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13. A battery charging apparatus which comprises:
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(a) voltage source means for forming a DC charging current at a specified voltage to be applied to charge a battery; (b) a discharge circuit which connects from the positive terminal of a battery comprising a switch and a solid state controlled resistor means to selectively and controllably discharge the battery; (c) a charging circuit utilizing said voltage source connected in series with the battery and said solid state resistor means to controllably charge the battery; (d) wherein said battery has positive and negative terminals and the positive terminal is connected to a first diode in said discharge circuit conductive to enable discharge current from the battery to flow through said solid state controlled resistor means; (e) a second diode connected from the negative terminal of the battery to flow charging current through said solid state controlled resistor means; and (f) a third diode having its cathode connected from the negative terminal of the battery to ground to conduct during discharge of the battery. - View Dependent Claims (14, 15, 18)
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16. A battery charging apparatus which comprises:
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(a) voltage source means for forming a DC charging current at a specified voltage to be applied to charge a battery; (b) a discharge circuit which connects from the positive terminal of a battery comprising a switch and a solid state controlled resistor means to selectively and controllably discharge the battery; (c) a charging circuit utilizing said voltage source connected in series with the battery and said solid state resistor means to controllably charge the battery; (d) wherein said switch is comprised of a transistor in said discharge circuit having a base adapted to be connected to a signal source switching said transistor off or on, said transistor functioning as a switch on connection of said transistor in the discharge circuit so that current flows through the collector and emitter thereof subject to gating of current flow by the base voltage. - View Dependent Claims (17, 19)
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Specification