Pulsed battery charger circuit
First Claim
1. A pulsed battery charger circuit including a drive output and a sense input comprising:
- an operational amplifier including a first input, a second input, and an output coupled to the drive output of the pulsed battery charger circuit, said second input being coupled to said output of said operational amplifier;
a sense circuit for sensing a battery voltage applied to the sense input of the pulsed battery charger circuit including an input coupled to the sense input, a first output, and a second output;
a control circuit including first and second inputs coupled respectively to said first and second outputs of said sense circuit, a clock input for receiving a clock signal, a first output, and a second output;
a first current source having a control input coupled to said first output of said control circuit and an output coupled to said first input of said operational amplifier wherein said control circuit enables and disables said first current source for providing first current pulses;
a second current source including a control input coupled to said second output of said control circuit and an output coupled to said first input of said operational amplifier wherein said control circuit enables and disables said second current source for providing second current pulses; and
a first resistor including a first terminal coupled to said first input of said operational amplifier and a second terminal coupled to the sense input of the pulsed battery charger circuit.
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Accused Products
Abstract
A pulsed battery charger circuit (11) for charging a battery (28). A control circuit (17) is responsive to a sense circuit (16) that monitors the battery voltage. The control circuit (17) pulses a first current source (25) or a second current source (20). An amplifier (14) is responsive to the first (25) and second (20) current sources for generating first and second predetermined voltages between a drive output (12) and a sense input (13). The first current source (25) is pulsed when the sense circuit (16) senses the battery voltage to be less than a first threshold voltage. The second current source (20) is pulsed when the sense circuit (16) senses the battery voltage to be greater than the first threshold voltage. Both the first (25) and second (20) current sources are disabled when the sense circuit (16) senses the battery voltage to be greater than a second threshold voltage.
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Citations
23 Claims
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1. A pulsed battery charger circuit including a drive output and a sense input comprising:
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an operational amplifier including a first input, a second input, and an output coupled to the drive output of the pulsed battery charger circuit, said second input being coupled to said output of said operational amplifier; a sense circuit for sensing a battery voltage applied to the sense input of the pulsed battery charger circuit including an input coupled to the sense input, a first output, and a second output; a control circuit including first and second inputs coupled respectively to said first and second outputs of said sense circuit, a clock input for receiving a clock signal, a first output, and a second output; a first current source having a control input coupled to said first output of said control circuit and an output coupled to said first input of said operational amplifier wherein said control circuit enables and disables said first current source for providing first current pulses; a second current source including a control input coupled to said second output of said control circuit and an output coupled to said first input of said operational amplifier wherein said control circuit enables and disables said second current source for providing second current pulses; and a first resistor including a first terminal coupled to said first input of said operational amplifier and a second terminal coupled to the sense input of the pulsed battery charger circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An integrated battery charger output stage circuit comprising:
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an amplifier including a first input, a second input, and an output; a level shift current source circuit for providing first and second currents including a control input, a first terminal coupled to said second input of said amplifier, and a second terminal; a current generator circuit including a terminal coupled to said second terminal of said level shift current source; a current mirror circuit including a first terminal coupled to said second terminal of said level shift current source circuit and a second terminal coupled to said first input of said amplifier; and a first resistor including a first terminal coupled to said first input of said amplifier and a second terminal coupled to said output of said amplifier. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for charging a battery comprising:
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pulsing a first predetermined current when a voltage of the battery is below a first predetermined voltage; pulsing a second predetermined current when said voltage of the battery is above said first predetermined voltage; sensing said voltage of the battery between current pulses of said first or second predetermined currents; and stopping said pulsing of said second predetermined current when said battery voltage is above a second predetermined voltage.
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Specification