Dual voltage supply system for vehicle - produces high charging volts for battery and constant volts for lights

摘要

The supply system has a shared control unit (10) connected in parallel with the stable loads (7,7a) to the vehicle generator (1). The stable loads are insensitive to fluctuations in their supply voltage. The control unit has a first output supply line producing a constant voltage for those unstable loads such as lamps (11) which are sensitive to fluctuations in their supply voltage. A second output supply line (12) carries twice the generator's voltage and is connected to the vehicle starter battery (5a) in order to charge it. The control unit contains a static inverter supplied from the vehicle's normal supply and with a transformer at its output. The transformer has windings for producing the constant voltage and the charging voltage for the battery. The constant voltage is controlled by a semiconductor device.