Battery over voltage and over current protection circuit and adjustable adapter current limit circuit
First Claim
1. A battery charger circuit comprising a charge controller generating a charging current and voltage along a charging path based on the duty cycle of PWM signal generated by said controller;
- and a protection circuit coupled to said charging path and adapted to reduce said duty cycle of said switches when said charging path is an open circuit, and thereby reduce the voltage and current generated by said PWM signal.
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Accused Products
Abstract
A battery charging circuit is disclosed that includes protection circuitry and/or adapter current limit offset circuitry. The protection circuitry is operable to reduce or eliminate an overvoltage and overcurrent condition generated by a charge controller when a charging path is an open circuit, for example, when a battery is disconnected from the charging path. The adapter current limit offset circuitry is operable to generate an offset signal to an adapter current signal utilized by a charger controller.
22 Citations
19 Claims
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1. A battery charger circuit comprising a charge controller generating a charging current and voltage along a charging path based on the duty cycle of PWM signal generated by said controller;
- and a protection circuit coupled to said charging path and adapted to reduce said duty cycle of said switches when said charging path is an open circuit, and thereby reduce the voltage and current generated by said PWM signal.
- View Dependent Claims (2, 3, 4, 5, 6, 18, 19)
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7. A battery charger circuit, comprising a battery charging circuit comprising a charge controller generating a charging current and voltage along a charging path based on the duty cycle of a PWM signal generated by said charge controller;
- and further comprising adapter current limit protection circuitry that generates an offset signal to an adapter current signal utilized by said controller.
- View Dependent Claims (8, 9, 10, 11, 12)
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13. A battery charger circuit, comprising a battery charging circuit comprising a charge controller generating a charging current and voltage along a charging path based on the duty cycle of a PWM signal generated by said controller;
- a protection circuit coupled to said charging path and adapted to generate feedback data to said charge controller to reduce said duty cycle of said switches when said charging path is an open circuit, and thereby reduce the voltage and current generated by said switches; and
adapter current limit protection circuitry that generates an offset signal to an adapter current signal utilized by said controller. - View Dependent Claims (14, 15, 16, 17)
- a protection circuit coupled to said charging path and adapted to generate feedback data to said charge controller to reduce said duty cycle of said switches when said charging path is an open circuit, and thereby reduce the voltage and current generated by said switches; and
Specification