Battery protection circuit and over-current blocking method using same
AssigneeLG Chem, Ltd.
InventorsWon Jeon JEONG, Ji Uk JANG
Life of this patent
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Abstract
The present invention relates to a battery protection circuit for accurately detecting and blocking overcurrent by overcharge and overdischarge by using a power management IC (PMIC) side sensing resistor provided in an external system and connected to a battery without a separate shunt resistor mounted in the battery, and an overcurrent blocking method using the same.
Claims10
A battery protection circuit of a battery connected to an external system connected to the battery, the external system including a power management unit having a sensing resistor for sensing an incoming battery current, the battery protection circuit comprising:
- a battery charge/discharge input and output unit connected to the external system;
- a control unit configured to sense overcurrent by overcharge and overdischarge and control a charge/discharge control FET;
- a charge control FET configured to control a flow of charge current of the battery under control of the control unit;
- and
- a discharge control FET configured to control a flow of discharge current of the battery under control of the control unit,
- wherein the control unit is connected to both ends of the sensing resistor of the power management unit of the external system to sense overcurrent by overcharge and overdischarge of the battery from a voltage at both ends of the sensing resistor.
Dependencies are inferred from the claim text.