DUAL VOLTAGE SYSTEM
First Claim
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1. In a vehicle electrical system:
- a. first and second DC load conductors, said second load conductor connected to a point of constant reference potential;
b. direct voltage generating means connected between said first and second DC load conductors;
c. first and second batteries connected in series between said first and second DC load conductors and defining a junction therebetween having a voltage thereat;
d. an electrical load circuit connected in parallel with said second battery between said junction and said second conductor means;
e. DC to DC converter means having input, output, and control terminals, said input terminals connected across said first battery and said output terminals connected across said second battery, said converter operable to charge said second battery from either said first battery or said generator; and
f. voltage regulator means connected between said junction and control terminals, said voltage regulator means responsive to the voltage at said junction and operative to cause said converter to maintain said voltage at said junction at a predetermined proportion of the voltage between said first and second DC load conductors.
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Abstract
Two 12-volt batteries are connected in series across the output of a 24-volt charging system, and a DC to DC converter is connected between the output of the charging system and a junction between the batteries. To maintain equal voltages across both batteries, the voltage at the junction is compared with a reference voltage by a voltage regulator that is operatively connected with a DC to DC converter to maintain a regulated output therefrom to the junction.
25 Citations
4 Claims
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1. In a vehicle electrical system:
- a. first and second DC load conductors, said second load conductor connected to a point of constant reference potential;
b. direct voltage generating means connected between said first and second DC load conductors;
c. first and second batteries connected in series between said first and second DC load conductors and defining a junction therebetween having a voltage thereat;
d. an electrical load circuit connected in parallel with said second battery between said junction and said second conductor means;
e. DC to DC converter means having input, output, and control terminals, said input terminals connected across said first battery and said output terminals connected across said second battery, said converter operable to charge said second battery from either said first battery or said generator; and
f. voltage regulator means connected between said junction and control terminals, said voltage regulator means responsive to the voltage at said junction and operative to cause said converter to maintain said voltage at said junction at a predetermined proportion of the voltage between said first and second DC load conductors.
- a. first and second DC load conductors, said second load conductor connected to a point of constant reference potential;
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2. In a vehicle electrical system having a generator connected between first and second DC load conductors, said second DC load conductor being connected to a point of constant reference potential, first and second equal voltage batteries connected in series between said first and second DC load conductors and defining a junction therebetween having a sense voltage thereat, a first load connected across said first and second batteries and a second load connected across said second battery, means for maintaining equal voltages across both said batteries comprising:
- a. DC to DC converter means comprising oscillator, transformer and rectifier means, the input to said converter means connected across said first battery and the output of said converter means connected to said second battery, said converter means operable to charge said second battery from either said first battery or said generator;
b. voltage divider means connected between said first and second DC load conductors and having a tap therebetween for providing a reference voltage, said reference voltage being a predetermined proportion of the voltage at said first DC load conductor; and
c. voltage regulator means for controlling the output of said converter at said reference voltage, said regulator comprising a first transistor and a second transistor, said first transistor connected between said junction and tap and controlled by differences in the voltages thereat and said second transistor connected between said first DC load conductor and said converter means and controlled by said first transistor, said first and second transistors being rendered conductive when said sense voltage at said junction is less than said reference voltage at said tap and being rendered non-conductive when said voltages are substantially the same, whereby said conduction and nonconduction of said second transistor maintains the output of said DC to DC converter at said reference voltage.
- a. DC to DC converter means comprising oscillator, transformer and rectifier means, the input to said converter means connected across said first battery and the output of said converter means connected to said second battery, said converter means operable to charge said second battery from either said first battery or said generator;
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3. A power supply system for a motor vehicle comprising:
- a. first and second load conductors, b. a direct voltage generating means having output terminals connected with said first and second conductor means, c. first and second series connected batteries connected across said first and second conductor means and having a junction located therebetween, d. an electrical load circuit connected in parallel with said second battery between said junction and said second conductor means, e. a voltage divider means connected across said batteries having a junction, the ratio of voltage division provided by said voltage divider means being the same as the ratio of the nominal terminal voltages of said batteries whereby the voltage at said voltage divider junction is substantially the same as the voltage at said junction between said batteries when both of said batteries are charged to said nominal voltages, f. power transfer means having an input connected across said first battery and an output connected across said second battery; and
g. means for causing said power transfer means to supply energy to said second battery from said first battery when the voltage at said voltage divider junction exceeds the voltage at said battery junction by a predetermined amount whereby the voltages applied to said batteries are substantially equalized during operation of said system.
- a. first and second load conductors, b. a direct voltage generating means having output terminals connected with said first and second conductor means, c. first and second series connected batteries connected across said first and second conductor means and having a junction located therebetween, d. an electrical load circuit connected in parallel with said second battery between said junction and said second conductor means, e. a voltage divider means connected across said batteries having a junction, the ratio of voltage division provided by said voltage divider means being the same as the ratio of the nominal terminal voltages of said batteries whereby the voltage at said voltage divider junction is substantially the same as the voltage at said junction between said batteries when both of said batteries are charged to said nominal voltages, f. power transfer means having an input connected across said first battery and an output connected across said second battery; and
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4. In a vehicle electrical system having a generator connected between first and second DC load conductors, said second load conductor being connected to a point of constant reference potential, a. first and second batteries connected in series between said first and second DC load conductors and defining a junction therebetween;
- b. means for maintaining voltage at said junction at a predetermined portion of the voltage between said first and second DC load conductors comprising;
i. DC to DC converter means having input, output and control terminals, said input terminals connected across said first battery and said output terminals connected across said second battery, said converter operable to charge said second battery from either said first battery or said generator;
ii. voltage divider means connected between said first and second DC load conductors and having a tap therebetween for providing a reference voltage, said reference voltage being said predetermined proportion of the voltage between said first and second DC load conductors; and
iii. voltage regulator means connected between said tap, junction, and control terminal of said converter, said voltage regulator means operative to maintain the output of said converter at said predetermined proportion.
- b. means for maintaining voltage at said junction at a predetermined portion of the voltage between said first and second DC load conductors comprising;
Specification