METHOD AND SYSTEM FOR MINIMUM OUTPUT-VOLTAGE BATTERY CHARGER
First Claim
1. A circuit for providing system power and charging a battery, comprising:
- a switching regulator configured for transmitting the system power based on an input power and a duty cycle;
a duty cycle generator configured for generating the duty cycle to be used to regulate power output from the circuit in response to an input-current limit control circuit, a battery-current limit control circuit, and a battery-voltage limit control circuit;
the input-current limit control circuit configured for limiting the duty cycle based on a limit of an input current;
the battery-current limit control circuit configured for limiting the duty cycle based on a limit of a battery charging current;
the battery-voltage limit control circuit configured for limiting the duty cycle based on a limit of a battery voltage;
a controllable impedance element for nominally coupling the battery to the system; and
an output voltage regulation circuit configured for controlling the controllable impedance element, the controllable impedance element partially or substantially decoupling the battery from the system when the voltage of the system drops below a system voltage limit.
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Accused Products
Abstract
An apparatus and method for a portable device incorporating a battery and a battery charger. In the portable device, there are a plurality of system components configured to facilitate a plurality of functions that the portable device is designed to perform. The battery in the portable device is configured for providing an internal power supply to the plurality of system components in the absence of an external input power supply. The battery charger is configured for charging the battery when the external input power supply is available. The battery charger disclosed herein is capable of supplying system power to the system components when voltage of the battery that is being charged is below a limit, thereby allowing the portable device to operate when voltage of the battery drops below the limit.
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Citations
16 Claims
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1. A circuit for providing system power and charging a battery, comprising:
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a switching regulator configured for transmitting the system power based on an input power and a duty cycle; a duty cycle generator configured for generating the duty cycle to be used to regulate power output from the circuit in response to an input-current limit control circuit, a battery-current limit control circuit, and a battery-voltage limit control circuit; the input-current limit control circuit configured for limiting the duty cycle based on a limit of an input current; the battery-current limit control circuit configured for limiting the duty cycle based on a limit of a battery charging current; the battery-voltage limit control circuit configured for limiting the duty cycle based on a limit of a battery voltage; a controllable impedance element for nominally coupling the battery to the system; and an output voltage regulation circuit configured for controlling the controllable impedance element, the controllable impedance element partially or substantially decoupling the battery from the system when the voltage of the system drops below a system voltage limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for a portable device, comprising:
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a plurality of system components configured to facilitate a plurality of functions that the portable device is designed to perform; a battery configured for providing an internal power supply to the plurality of system components in the absence of an external input power supply; and a battery charger configured for charging the battery when the external input power supply is available, wherein the battery charger is capable of supplying system power to the system components when voltage of the battery that is being charged is below a limit, thereby allowing the system components to operate when the voltage of the battery drops below the limit. - View Dependent Claims (15, 16)
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Specification