Patent ID: 9190869
Filing Date: 2015-11-17
Classification: H02J

Abstract:
1. A circuit for operating an auxiliary unit for starting internal combustion engines via a starter battery, comprising: a circuit arrangement, which is a start-stop system having a battery management system, configured to receive a state-of-charge signal and a state-of-function signal and a state-of-health signal from the battery-management system, the respective signals indicating a state of charge of the starter battery, whether the starter battery is capable of operating the auxiliary unit, and whether the starter battery is damaged; wherein the circuit arrangement is configured to absorb electrical energy from a high-voltage battery, connected to the circuit arrangement, when the state-of-charge signal indicates that the state of charge of the starter battery is too low to operate the auxiliary unit and when the following is satisfied: (i) the state-of-function signal indicates that operation of the auxiliary unit by the starter battery is not possible, and (ii) the state-of-health signal indicates that the starter battery is damaged, and wherein the state of function of the starter battery characterizes whether the starter battery is capable of taking up adequate electrical energy to operate the auxiliary unit.