Battery charger for charging batteries requiring a constant current source only and the constant current source followed by constant voltage source
First Claim
1. A universal battery recharging circuit, comprising:
- a constant current recharging circuit;
a constant voltage recharging circuit;
a voltage supply;
an input terminal for receiving a battery voltage;
a voltage comparative circuit having an output signal;
a controller; and
a regulator, wherein said universal battery recharging circuit can recharge batteries requiring a constant current for recharging, a constant voltage for recharging, or a constant current followed by a constant voltage for recharging, said constant current recharging circuit and said constant voltage recharging circuit both providing feedback to said regulator, said controller having as input signals a battery sensing signal and said output signal from said voltage comparative circuit, and having as output signals a first output signal, a second output signal, and a third output signal, said first output signal activating said constant current recharging circuit, said second output signal activating said constant voltage recharging circuit, said third output circuit activating said voltage comparative circuit.
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Accused Products
Abstract
Disclosed is a battery charger capable of charging a rechargeable battery in accordance with three different types of charge modes. These three charge modes are constant current, constant voltage, and constant current followed by a constant voltage. A microprocessor receives as input signals from a battery indicating the battery type and the battery voltage. The microprocessor automatically outputs control signals which activate certain circuitry depending upon the inputs received from the battery. A regulator outputs a switching voltage that is converted into either a constant current or a constant voltage depending upon the circuitry activated. The circuitry provides feedback to the regulator so that the proper pulse width is output by the regulator depending upon the current or voltage sensed. A voltage comparator compares the terminal voltage of the battery and a divided terminal voltage of the battery to a reference value, and sends the results on to the microprocessor which automatically determines whether or not to complete the recharging process using a constant voltage producing circuit.
42 Citations
8 Claims
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1. A universal battery recharging circuit, comprising:
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a constant current recharging circuit; a constant voltage recharging circuit; a voltage supply; an input terminal for receiving a battery voltage; a voltage comparative circuit having an output signal; a controller; and a regulator, wherein said universal battery recharging circuit can recharge batteries requiring a constant current for recharging, a constant voltage for recharging, or a constant current followed by a constant voltage for recharging, said constant current recharging circuit and said constant voltage recharging circuit both providing feedback to said regulator, said controller having as input signals a battery sensing signal and said output signal from said voltage comparative circuit, and having as output signals a first output signal, a second output signal, and a third output signal, said first output signal activating said constant current recharging circuit, said second output signal activating said constant voltage recharging circuit, said third output circuit activating said voltage comparative circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification