OVER VOLTAGE TRANSIENT CONTROLLER
First Claim
1. A circuit comprising:
- a comparator operable for comparing a monitoring signal indicating a difference between a raw voltage level of a battery pack and an average voltage level of said battery pack to an adjustable reference signal, and for generating a comparison output indicating a condition of said battery pack; and
a control loop coupled to said comparator and operable for receiving said comparison output and for adjusting said adjustable reference signal according to said average voltage level,wherein said control loop comprises a digital-to-analog converter operable for generating an output signal according to said average voltage level, and wherein said adjustable reference signal is based on said output signal.
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Abstract
An over voltage transient controller to protect a rechargeable battery from an over voltage transient condition. The over voltage transient controller may comprise a comparator to compare a first signal with a second signal representative of a reference voltage level and to provide an output signal representative of an over voltage transient condition to a switch if the first signal is greater than or equal to the second signal. The switch is responsive to the output signal to protect the rechargeable battery from the over voltage transient condition. The over voltage transient controller may further comprise a DAC, wherein the second signal is based, at least in part, on an output of the DAC. An apparatus comprising a charge switch and such an over voltage transient controller is also provided.
31 Citations
15 Claims
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1. A circuit comprising:
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a comparator operable for comparing a monitoring signal indicating a difference between a raw voltage level of a battery pack and an average voltage level of said battery pack to an adjustable reference signal, and for generating a comparison output indicating a condition of said battery pack; and a control loop coupled to said comparator and operable for receiving said comparison output and for adjusting said adjustable reference signal according to said average voltage level, wherein said control loop comprises a digital-to-analog converter operable for generating an output signal according to said average voltage level, and wherein said adjustable reference signal is based on said output signal. - View Dependent Claims (2, 3, 4)
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5. An apparatus comprising:
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a first switch coupled to a battery pack in series; and an over voltage transient controller coupled to said first switch and operable for comparing a monitoring signal indicative of a difference between a raw voltage level of said battery pack and an average voltage level of said battery pack to an adjustable reference signal, and for generating a control signal when said monitoring signal is greater than said adjustable reference signal, wherein said adjustable reference signal is adjusted based on said average battery level, and wherein said first switch responds to said control signal to protect said battery pack from an over voltage transient condition. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for detecting an over voltage transient condition of a battery pack, said method comprising:
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receiving a monitoring signal indicative of a difference between a raw voltage level of said battery pack and an average voltage level of said battery pack; generating an adjustable reference signal according to said average battery level by an analog-to-digital conversion; and generating a control signal representative of said over voltage transient condition if said monitoring signal is greater than said adjustable reference signal. - View Dependent Claims (13, 14, 15)
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Specification