Load/charger detection circuit, battery management system comprising the same and driving method thereof
AssigneeFairchild Korea Semiconductor Ltd.
InventorsJinhwa CHUNG, Sehwan KIM
Life of this patent
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Abstract
Disclosed are a load/charger detection circuit, a battery management system comprising the same and a driving method thereof. The load/charger detection circuit includes a current source; a current mirror connected to the current source to copy a current of the current mirror; at least two resistors connected between a first terminal providing a corresponding voltage to a charger or a load and a power supply; and a zener diode connected between the first terminal and the current mirror.
Claims14
A load/charger detection circuit comprising:
- a current source;
- a current mirror coupled to the current source and configured to copy a current of the current source;
- at least two resistors coupled to each other in series between a first terminal providing a corresponding voltage to a charger or a load and a power supply;
- and
- a zener diode coupled between the first terminal and the current mirror.
A battery management system comprising:
- a first terminal providing a corresponding first voltage when a load or a charger is connected;
- a load/charger detector receiving the first voltage through the first terminal, providing a first signal when the load is connected, and providing a second signal when the charger is connected;
- and
- a controller controlling such that discharging is performed from a battery cell to the load according to the first signal, and controlling such that charging is performed from the charger to the battery cell according to the second signal,
- wherein the load/charger detector includes,
- at least two resistors coupled to each other in series between a voltage source and the first terminal;
- a current mirror coupled to a current source and configured to copy a current of the current source;
- and
- a zener diode coupled between the first terminal and the current mirror, and
- wherein the first signal corresponds to a voltage of a first contact point between the current source and the current mirror, and the second signal corresponds to a voltage of a second contact point between the at least two resistors.
A method of driving a battery management system, the method comprising:
- providing a current source;
- providing a current mirror coupled to the current source to copy a current of the current mirror;
- providing a first terminal configured to provide a first voltage when a charger is connected and to provide a second voltage greater than the first voltage when a load is connected;
- providing at least two resistors coupled to each other in series between a voltage source and the first terminal;
- providing a first signal to a contact point between the at least two resistors by stopping the current mirror when the charger is connected;
- providing a second signal to a contact point between the current source and the current mirror by operating the current mirror when the load is connected;
- and
- charging or discharging a battery cell according to the first signal and the second signal.
Dependencies are inferred from the claim text.