Patent ID: 7755303
Filing Date: 2010-07-13
Classification: H05B,Y02B

Abstract:
1. An automobile lighting circuit, comprising: a power source; a temperature sensor outputting ambient temperature measurement data; a voltage sensor coupled to the power source and configured to determine a system voltage therefrom and to output system voltage measurement data based on the system voltage; a voltage adjusting module configured to receive the ambient temperature measurement data and the system voltage measurement data, and responsive to both the ambient temperature measurement data and the system voltage measurement data thereto, to estimate a voltage loss in the lighting circuit based on the ambient temperature measurement data, the system voltage measurement data, or both, and to output a pulse width modulation signal in response to the voltage loss; a switch that is electrically coupled to the power source and to the voltage adjusting module, the switch being operable to receive the pulse width modulating signal and regulate a duty cycle for voltage from the power source based on the voltage loss to maintain a constant output voltage; and a lighting component coupled to receive the constant output voltage from the switch.