Dual voltage charging system

Claim 2

A circuit for charging the first of first and second series connected batteries comprising: a. voltage sensitive switch means connected across said second battery and operative to provide a first output voltage when the voltage across said second battery exceeds a first predetermined voltage and a second output voltage when the voltage across said second battery is less than said first predetermined voltage; b. controllable oscillator and transformer means operatively connected with said second battery and said voltage sensitive switch, said controllable transformer means rendered operable to provide an AC output voltage by the presence of said first output voltage of said voltage sensitive switch and rendered inoperable by the presence of said second output voltage of said voltage sensitive switch; and c. rectifier and regulator means connecting said oscillator and transformer means with said first battery and operative to maintain a second predetermined voltage there-across when the voltage across said second battery is greater than said first predetermined voltage.

Claim 3

In a vehicle charging system including a generator having first and second DC output terminals, one of said output terminals being connected to a point of constant reference potential, a first battery connected between said output terminals of said generator, a second battery having first and second terminals, one of said terminals of said second battery being connected to the other of said generator output terminals, a circuit for charging said second battery comprising: a. controllable oscillator means connected between said first and second output terminals of said generator and operative to provide an AC output voltage, said oscillator having operable and nonoperable states: b. voltage sensitive switch connected between said output terminals of said generator and operatively connected with said controllable oscillator means to render said oscillator means operable when the voltage across said first and second output terminals of said generator exceeds a first predetermined voltage and to render said oscillator means inoperable when said voltage across said first and second output terminals of said generator is less than said first predetermined voltage; c. rectifier means connected with said oscillator means to rectify said AC output voltage and having first and second DC output terminals connected respectively with said first and second terminals of said second battery, said rectifier means comprising a controllable unidirectional current conducting device; and, d. voltage regulator means connected between said first and second terminals of said second battery and operatively connected with said controllable unidirectional current conducting device to render said device conductive when the voltage between said first and second terminals of said second battery is less than a second predetermined voltage and to permit said controllable device to become nonconductive when said voltage exceeds said second predetermined voltage, whereby said second predetermined voltage is maintained across said second battery when the output of said generator is greater than said first predetermined voltage.

Claim 4

In a vehicle charging system including a generator having first and second DC output terminals, one of said output terminals being connected to a point of constant reference potential, a first battery connected between said output terminals of said generator, a second battery having first and second terminals, one of said terminals of said second battery being connected to the other of said generator output terminals, a circuit for charging said second battery comprising: a. controllable oscillator means connected between said first and second output terminals of said generator and operative to provide an AC output voltage, said oscillator having operable and nonoperable states: b. voltage sensitive switch connected between said output terminals of said generator and operatively connected with said controllable oscillator means to render said oscillator means operable when the voltage across said first and second output terminals of said generator exceeds a first predetermined voltage and to render said oscillator means inoperable when said voltage across said first and second output terminals of said generator is less than said first predetermined voltage; c. rectifier means connected with said oscillator means to rectify said AC output voltage and having first and second DC output terminals connected respectively with said first and second terminals of said second battery, said rectifier means comprising a controllable unidirectional current conducting device; and, d. voltage regulator means connected between said first and second terminals of said second battery and operatively connected with said controllable unidirectional current conducting device to render said device conductive when the voltage between said first and second terminals of said second battery is less than a second predetermined voltage and to permit said controllable device to become nonconductive when said voltage exceeds said second predetermined voltage, whereby said second predetermined voltage is maintained across said second battery when the output of said generator is greater than said first predetermined voltage.

Claim 5

A battery charging system for a dual voltage motor vehicle electrical system wherein first and second batteries are connected in series to supply a high voltage load and wherein at least one of said first and second batteries is utilized to supply a lower voltage electrical load, the combination comprising: a. a direct voltage generating means; conductor means connecting the output terminals of said direct voltage generating means with opposite sides of said first battery whereby said first battery can be charged from said direct voltage generating means, b. a DC to AC converter means connecting said conductor means with the input of said DC to AC converter including a switching means, voltage sensing means for sensing the voltage across said conductor means; c. means connecting said voltage sensing means and said switching means such that said switching means is biased to a conductive condition to electrically connect said conductor means and the input of said DC to AC converter when the voltage across said conductor means exceeds a predetermined value, said switching means being biased to a nonconductive condition by said voltage sensing means when the voltage across said conductor means is below a predetermined value to thereby disconnect said conductor means and said input of said DC to AC converter, d. rectifier means having input terminals connected with the output of said DC to AC converter and having direct current output terminals connected across said second battery whereby said second battery can be charged by the voltage appearing across said conductor means through said DC to AC converter when said switching means is biased conductive; and e. voltage regulating means including a voltage sensing circuit connected across said second battery for maintaining the voltage applied to said second battery at a predetermined regulated value.

Claim 6

A battery charging system for a dual voltage motor vehicle electrical system wherein first and second batteries are connected in series to supply a high voltage load and wherein at least one of said first and second batteries is utilized to supply a lower voltage electrical load, the combination comprising: a. a direct voltage generating means; conductor means connecting the output terminals of said direct voltage generating means with opposite sides of said first battery whereby said first battery can be charged from said direct voltage generating means, b. a DC to AC converter means connecting said conductor means with the input of said DC to AC converter including a switching means, voltage sensing means for sensing the voltage across said conductor means; c. means connecting said voltage sensing means and said switching means such that said switching means is biased to a conductive condition to electrically connect said conductor means and the input of said DC to AC converter when the voltage across said conductor means exceeds a predetermined value, said switching means being biased to a nonconductive condition by said voltage sensing means when the voltage across said conductor means is below a predetermined value to thereby disconnect said conductor means and said input of said DC to AC converter, d. rectifier means having input terminals connected with the output of said DC to AC converter and having direct current output terminals connected across said second battery whereby said second battery can be charged by the voltage appearing across said conductor means through said DC to AC converter when said switching means is biased conductive; and e. voltage regulating means including a voltage sensing circuit connected across said second battery for maintaining the voltage applied to said second battery at a predetermined regulated value.

Claim 7

A battery charging system for a dual voltage motor vehicle electrical system comprising, a. first and second batteries; b. a direct voltage generating means having direct current output terminals connected across said first battery for charging said first battery; c. a DC to AC converter; d. means connecting the input of said DC to AC converter with said first battery including a switching means; e. means for biasing said switching means to a conductive condition to electrically connect said first battery and the input of said DC to AC converter when the voltage across said first battery exceeds a predetermined value, said last named means operative to bias said switching means to a nonconductive condition to disconnect said first battery and the input of said DC to AC converter when the voltage across said first battery drops below a predetermined value, f. rectifier means having input terminals connected with the output of said DC to AC converter and having direct current output terminals connected across said second battery whereby said second battery can be charged from the system including said first battery when said switching means is biased conductive; and g. voltage regulating means including a voltage sensing circuit connected across said second battery for maintaining the voltage applied to said second battery at a predetermined value.

Claim 8

A battery charging system for a dual voltage motor vehicle electrical system comprising, a. first and second batteries; b. a direct voltage generating means having direct current output terminals connected across said first battery for charging said first battery; c. a DC to AC converter; d. means connecting the input of said DC to AC converter with said first battery including a switching means; e. means for biasing said switching means to a conductive condition to electrically connect said first battery and the input of said DC to AC converter when the voltage across said first battery exceeds a predetermined value, said last named means operative to bias said switching means to a nonconductive condition to disconnect said first battery and the input of said DC to AC converter when the voltage across said first battery drops below a predetermined value, f. rectifier means having input terminals connected with the output of said DC to AC converter and having direct current output terminals connected across said second battery whereby said second battery can be charged from the system including said first battery when said switching means is biased conductive; and g. voltage regulating means including a voltage sensing circuit connected across said second battery for maintaining the voltage applied to said second battery at a predetermined value.

Claim 9

A battery charging system for a dual voltage motor vehicle electrical system comprising: a. first and second batteries; b. direct voltage generating means connected across said first battery for charging said first battery; c. DC to DC converter means comprising oscillator transformer and rectifier means, said DC to DC converter connecting said generating means with said second battery; d. a voltage sensitive switch connected across said generaTing means and operatively connected with said DC to DC converter means to render said converter means operable to produce an output therefrom when the voltage across said generating means exceeds a first predetermined voltage and to render said converter means inoperable when said voltage across said generating means is less than said first predetermined voltage; and e. voltage regulator means connected across said second battery and operatively connected with said DC to DC converter means to maintain a second predetermined voltage from the output thereof to said second battery when the voltage across said generating means is greater than said first predetermined value.

Claim 10

A battery charging system for a dual voltage motor vehicle electrical system comprising: a. first and second batteries; b. direct voltage generating means connected across said first battery for charging said first battery; c. DC to DC converter means comprising oscillator transformer and rectifier means, said DC to DC converter connecting said generating means with said second battery; d. a voltage sensitive switch connected across said generaTing means and operatively connected with said DC to DC converter means to render said converter means operable to produce an output therefrom when the voltage across said generating means exceeds a first predetermined voltage and to render said converter means inoperable when said voltage across said generating means is less than said first predetermined voltage; and e. voltage regulator means connected across said second battery and operatively connected with said DC to DC converter means to maintain a second predetermined voltage from the output thereof to said second battery when the voltage across said generating means is greater than said first predetermined value.