Method and apparatus for charging and discharging a rechargeable battery
First Claim
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1. A battery protection system for a rechargeable battery, comprising:
- a switch module that selectively interrupts battery current from the rechargeable battery to a load based on a control signal;
a battery voltage sensor that senses battery voltage;
a battery temperature sensor that generates a battery temperature signal; and
a control module that generates said control signal based on said battery temperature signal and said battery voltage, wherein said control signal is a pulse-width modulated (PWM) waveform having a period that is set by a first signal and a duty cycle that is set by a second signal that varies based on said battery temperature signal and said first signal and wherein said duty cycle is zero percent when said battery temperature exceeds a first predetermined temperature.
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Abstract
A battery protection system is provided for a rechargeable battery. The system has a switch module that selectively interrupts battery current based on a control signal, a battery voltage sensor that senses battery voltage, a battery temperature sensor that generates a battery temperature signal, and a control module that generates said control signal based on said battery temperature signal and said battery voltage.
42 Citations
24 Claims
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1. A battery protection system for a rechargeable battery, comprising:
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a switch module that selectively interrupts battery current from the rechargeable battery to a load based on a control signal; a battery voltage sensor that senses battery voltage; a battery temperature sensor that generates a battery temperature signal; and a control module that generates said control signal based on said battery temperature signal and said battery voltage, wherein said control signal is a pulse-width modulated (PWM) waveform having a period that is set by a first signal and a duty cycle that is set by a second signal that varies based on said battery temperature signal and said first signal and wherein said duty cycle is zero percent when said battery temperature exceeds a first predetermined temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 21, 22, 23)
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8. A battery protection circuit comprising:
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a switch module that selectively interrupts battery current based on a control signal; a first oscillator module that generates a first signal having a first period; a temperature dependent oscillator module that generates a second signal having a second period; and a duty cycle generator that receives said first signal and said second signal and generates said control signal, wherein said control signal is pulse-width modulated at said first period with a duty cycle established by said second period wherein said temperature dependent oscillator module receives a reset signal that is based on said first signal and generates said second signal based on said reset signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for protecting a rechargeable battery, comprising:
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monitoring a battery temperature; monitoring a battery voltage; pulse width modulating the current flow from the battery at a period that is set by a first signal and at a duty cycle that is set by a second signal that varies based on said battery temperature and said battery voltage and said first signal; and setting said duty cycle to turn off the current flow when said battery temperature exceeds a first predetermined temperature. - View Dependent Claims (16, 17, 18, 19, 20)
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24. A battery protection circuit comprising:
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a switch module that selectively interrupts battery current based on a control signal; a first oscillator module that generates a first signal having a first period; a temperature dependent oscillator module that generates a second signal having a second period; and a duty cycle generator that receives said first signal and said second signal and generates said control signal, wherein said control signal is pulse-width modulated at said first period with a duty cycle established by said second period, wherein said temperature dependent oscillator module generates said second signal based on said first signal.
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Specification