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US 11,239,685 B2Granted
Battery charging system
AssigneeTexas Instruments Incorporated
InventorIsaac Cohen
Life of this patent
Estimating the term…
Abstract
One example includes a battery charging system configured to charge a battery associated with a mobile device. The battery charging system includes a transformer configured to receive an AC charging current via a charging cable at a primary inductor and to generate an AC secondary current at a secondary inductor. The battery charging system also includes a rectifier system configured to rectify and filter the AC secondary current to generate a DC charging current that is provided to charge a battery.
Claims18
A mobile device comprising:
- a first terminal configured to receive an AC voltage from an AC adapter;
- a second terminal configured to provide a DC control signal to the AC adapter;
- a controller having a first input configured to monitor an alternating current associated with the AC voltage, a second input configured to monitor a battery voltage of a battery, an output configured to provide the DC control signal based on the alternating current and the battery voltage, the DC control signal is configured to adjust an output current of the AC adapter;
- a transformer having a primary inductor configured to receive the AC voltage as a primary voltage, and a secondary inductor configured to provide a secondary voltage;
- a rectifier system coupled to the secondary inductor, and configured to generate a direct current for charging the battery to the battery voltage;
- a resistor having a first end coupled to the primary inductor, and a second end coupled to the first input of the controller for providing a charge voltage representative of the alternating current;
- and
- a capacitor having a first end coupled to the output of the controller, and a second end coupled to the first input of the controller.
5 more elements
A controller comprising:
- a first input configured to receive an AC charge voltage representative of an AC charge current from a primary inductor of a transformer;
- a second input configured to receive a DC battery voltage rectified from a secondary inductor of the transformer;
- and
- an output configured to provide a feedback signal to an AC power source for providing the AC charge current to the primary inductor, the feedback signal based on a first amplitude of the AC charge voltage and a second amplitude of the DC battery voltage.
1 more element
A battery operated device comprising:
- a first terminal configured to receive an AC charge current from an external AC adapter;
- a second terminal configured to provide a DC control signal to the external AC adapter;
- a transformer having a primary inductor coupled to the first terminal for receiving the AC charge current, and a secondary inductor configured to provide a secondary voltage;
- and
- a rectifier system coupled to the secondary inductor, and configured to generate a DC charge current;
- a battery having a first terminal coupled to receive the DC charge current, and a second terminal coupled to a ground terminal;
- and
- a controller having a first input configured to monitor the AC charge current, a second input configured to monitor a battery voltage of the battery, an output configured to provide the DC control signal to adjust the AC charge current provided by the external AC adapter.
5 more elements
Dependencies are inferred from the claim text.