Patent ID: 9007033
Filing Date: 2015-04-14
Classification: H02J

Abstract:
1. A battery charger system, comprising: charger controller circuitry configured to generate a controllable charging current to charge a battery coupled to the charger controller, the charger controller comprising a temperature sensing node configured to be coupled to temperature sensor circuitry, associated with the battery, to monitor a voltage drop proportional to the temperature of the battery, wherein when the battery charger circuitry is coupled to the battery, a parasitic resistance is generated; and compensation circuitry coupled to the temperature sensing node and configured to generate a compensation current that sinks current from the temperature sensing node in an amount proportional to a voltage drop of the controllable charging current across the parasitic resistance, wherein the charger controller circuitry further comprises current source circuitry configured to supply a temperature sensing current, based on a reference current, to the temperature sensor circuitry, and wherein the current source circuitry comprises: