Dual voltage supply circuit for vehicles
First Claim
1. A voltage supply for vehicles with a dual circuit electrical braking system comprising,a starter battery,an auxiliary battery,a three phase generator electrically connected to said starter battery and said auxiliary battery;
- a first electrical path connecting said three phase generator and said starter battery including a set of power diodes, having a diode for each phase of the three phase generator for charging said starter battery,a second electrical path connecting said three phase generator and said auxiliary battery including a set of excitation diodes having a diode for each phase of the three phase generator for charging said auxiliary battery,a first monitor between said first and second electrical paths, connect to monitor charging of said starter battery, anda second monitor between said excitation diodes and said auxiliary battery connected such that only current flowing through said second monitor is received from said excitation diodes at said auxiliary battery.
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Abstract
A dual voltage supply circuit for vehicles is disclosed, in particular for vehicles with a dual circuit electrical braking system. The circuit contains a starter battery and an auxiliary battery, each supplying an electrical braking circuit. The two batteries are charged from a three phase generator which has power diodes and excitation diodes. The auxiliary battery is charged via an electrical path from the excitation diodes. A monitoring module, which includes a charge monitoring system and a time delay, is connected in series between the excitation diodes and the auxiliary battery.
33 Citations
13 Claims
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1. A voltage supply for vehicles with a dual circuit electrical braking system comprising,
a starter battery, an auxiliary battery, a three phase generator electrically connected to said starter battery and said auxiliary battery; -
a first electrical path connecting said three phase generator and said starter battery including a set of power diodes, having a diode for each phase of the three phase generator for charging said starter battery, a second electrical path connecting said three phase generator and said auxiliary battery including a set of excitation diodes having a diode for each phase of the three phase generator for charging said auxiliary battery, a first monitor between said first and second electrical paths, connect to monitor charging of said starter battery, and a second monitor between said excitation diodes and said auxiliary battery connected such that only current flowing through said second monitor is received from said excitation diodes at said auxiliary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A voltage supply for vehicles with a dual circuit electrical breaking system comprising:
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a starter battery; an auxiliary battery; a three phase generator electrically connected to said starter battery and said auxiliary battery; a first electrical path connecting said three phase generator and said starter battery including a set of power diodes, having a diode for each phase of the three phase generator for charging said starter battery; a second electrical path connecting said three phase generator and said auxiliary battery including a set of excitation diodes having a diode for each phase of the three phase generator for charging said auxiliary battery; a first monitoring means for monitoring the charging of said battery connected between said first and second electrical paths, and for shutting off once said starter battery is charged to a nominal voltage, thereby causing voltage on said second electrical path to increase; and a second monitoring means connected between said excitation diodes and said auxiliary battery such that only current flowing through said second monitoring means is received from said excitation diodes at said auxiliary battery, said second monitoring means also comprising; (a) delay means for delaying charging of said auxiliary battery until said first monitoring means shuts off; (b) a charge current limiter connected between said excitation diodes and said auxiliary battery; (c) and a charge monitoring system connected on either side of said charge current limiter, said charge current monitoring system comprising; (i) a first voltage divider connected between said delay means and said current limiter, (ii) a second voltage divider connected between said current limiter and said auxiliary battery, (iii) an operational amplifier having a non-inverting input connected to said first voltage divider and an inverting input connected to said second voltage divider; and (iv) a means for detecting frequency and duration of operation of said charge current limiter connected to an output of said operational amplifier. - View Dependent Claims (13)
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Specification