Dual battery charger having dual output

Claim 2

A vehicle charging system comprising: a. alternator means controllable to produce one of first and second output voltages; b. first and second batteries connected in series and defining a junction therebetween, one side of said series connected batteries being connected to a point of constant reference potential; c. means responsive to the voltage between the other side of said series connected batteries and said junction and operative to connect said one output voltage of said alternator to said other side of said series connected batteries when said voltage between said other side and said junction is less than a first predetermined voltage whereby both said batteries are charged and to connect the other of said first and second output voltages to said junction when the voltage between said other side and said junction is greater than said first predetermined voltage, whereby one of said first and second batteries is charged; and d. a voltage regulator respoNsive to the voltage at said junction and operatively connected with said alternator means to maintain a second predetermined voltage at said junction, whereby said regulator means controls said alternator means to produce said one of said first and second output voltages when said one output voltage is applied to said other said side of said series connected batteries and to control said alternator means to produce said other of said first and second voltages when said other voltage is applied to said junction.

Claim 3

A motor vehicle battery charging system for charging at least two batteries comprising: a. an alternating current generator having an output winding and a field winding; b. first rectifier means having AC input terminals connected to said output winding and first and second direct current output terminals; c. first and second batteries; d. means connecting said batteries in series across said direct current output terminals of said first rectifier means with said first battery connected between said first output terminal and a junction and said second battery connected between said junction and said second output terminal; e. a voltage regulating means including field current control means connected with said field winding and said output winding of said generator, said voltage regulating means including voltage sensing means connected between said junction and said second direct current output terminal of said rectifier means whereby the output voltage of said generator is regulated to a value which is a function of the voltage appearing between said junction and said second direct current output terminal of said first rectifier means; f. second rectifier means having direct current output terminals and AC input terminals connected with said output winding; and g. means responsive to the voltage appearing between said first direct current output terminal of said first rectifier means and said junction causing a direct voltage from said second rectifier means to be applied to said junction when the voltage between said first output terminal and said junction reaches a predetermined value to thereby substantially terminate charging of said first battery and charge said second battery from said second rectifier means.