Patent ID: 11955823
Assignee: O2MICRO INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A battery pack comprising:
a battery configured to power a load module if said battery is coupled to said load module;
a protection terminal configured to provide a protection signal to protect said battery; and
protection circuitry, coupled to said battery and said protection terminal, and configured to control said protection signal to a state of a plurality of states according to a status of said battery, wherein if said battery pack is connected to an external power source through a charge module, then said protection signal controls a charge switch, in said charger module, to control charging of said battery, and wherein if there is no external power source connected to said battery pack, then said protection signal controls a discharge switch, in said load module, to control discharging of said battery, wherein said plurality of states comprise a first state, a second state, a third state, and a fourth state, and wherein:
said protection signal, if in said first state, causes said charge switch to be turned on and said discharge switch to be turned off;
said protection signal, if in said second state, causes said charge switch to be turned off and said discharge switch to be turned on;
said protection signal, if in said third state, causes said charge switch to be turned off and said discharge switch to be turned off; and
said protection signal, if in said fourth state, causes said charge switch to be turned on and said discharge switch to be turned on.