Battery protection system with reference voltage control system
AssigneeSemiconductor Components Industries, LLC
InventorsYasuaki Hayashi, Keiji Amemiya, Mutsuki Niki, Hiroshi Saito
Life of this patent
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Abstract
A programmable battery protection system. Implementations may include: a battery and a battery protection integrated circuit (IC) coupled with the battery that includes a reference voltage circuit, a variable resistor circuit coupled with the reference voltage circuit, and only two field effect transistors (FETs) coupled with the overcurrent detection circuit and with the battery. The reference voltage circuit and the variable resistor circuit may be configured to cause a current sense signal of the system to vary substantially linearly with changes in a supply voltage of the system.
Claims20
A battery protection integrated circuit (IC) comprising:
- a reference voltage circuit;
- a variable resistor circuit coupled with the reference voltage circuit;
- an overcurrent detection circuit coupled with the reference voltage circuit;
- and
- two field effect transistors (FETs) coupled with the overcurrent detection circuit.
A battery protection integrated circuit (IC) for a battery protection system, the IC comprising:
- a reference voltage circuit;
- a variable resistor circuit coupled with the reference voltage circuit;
- an overcurrent detection circuit coupled with the reference voltage circuit;
- and
- two field effect transistors (FETs) coupled with the overcurrent detection circuit and with the battery;
- wherein the reference voltage circuit and variable resistor circuit are configured to cause a current sense signal of the battery protection system to vary substantially linearly with changes in a supply voltage of the battery protection system.
A method of providing a reference voltage to an overcurrent detection circuit of a battery protection integrated circuit (IC), the method comprising:
- substantially linearizing a response of a current sense signal of a battery to changes in a supply voltage of the battery by:
- setting a summed resistance of a plurality of resistors coupled to a plurality of switching components;
- using the summed resistance, generating a current by converting variation in the supply voltage into a current;
- and
- generating a reference voltage for use by an overcurrent detector circuit.
Dependencies are inferred from the claim text.