Apparatus for regulating the current drawn from an electric battery
First Claim
1. In a system having an electrical battery (10), a load (11) connected to said battery, and current regulator means (12) for regulating the current drawn from said battery under external control, the improvement comprising, in accordance with the invention, voltage sensor means (14) connected across said battery for furnishing a sensed voltage signal corresponding to the voltage across said battery;
- current sensor means (15-16) connected in series with said load for furnishing a sensed current signal corresponding to said current drawn from said battery;
means for furnishing a reference signal;
additive combining means (17,
18) connected to said voltage sensor means and said current sensor means, adding the voltage signal and the current signal, and furnishing a combined addition signal;
comparing means (19) connected to said combining means and said means for furnishing a reference signal for comparing said combined signal to said reference signal and furnishing a difference signal corresponding to the difference therebetween;
and limiter means (23) interconnected between said comparing means and said current regulator means, for controlling said current regulator means.
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Abstract
A difference amplifier compares the sum of a signal corresponding to the voltage across the battery and a signal corresponding to the current through the battery to a reference signal. When the output of the difference amplifier indicates that the sum of the two signals is less than the reference signal, a limiter circuit responds to limit the current drawn from the battery by controlling a current regulator interconnected between the battery and its load. If desired, a temperature signal indicative of the battery of temperature can also be applied to the difference amplifier so that the point at which the regulation sets in varies as a function of temperature.
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Citations
12 Claims
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1. In a system having an electrical battery (10), a load (11) connected to said battery, and current regulator means (12) for regulating the current drawn from said battery under external control, the improvement comprising, in accordance with the invention, voltage sensor means (14) connected across said battery for furnishing a sensed voltage signal corresponding to the voltage across said battery;
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current sensor means (15-16) connected in series with said load for furnishing a sensed current signal corresponding to said current drawn from said battery; means for furnishing a reference signal; additive combining means (17,
18) connected to said voltage sensor means and said current sensor means, adding the voltage signal and the current signal, and furnishing a combined addition signal;comparing means (19) connected to said combining means and said means for furnishing a reference signal for comparing said combined signal to said reference signal and furnishing a difference signal corresponding to the difference therebetween; and limiter means (23) interconnected between said comparing means and said current regulator means, for controlling said current regulator means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a system having an electrical battery (10), a load (11) connected to said battery, and current regulator means (12) for regulating the current drawn from said battery under external control, the improvement comprising, in accordance with the invention, voltage sensor means (14) connected across said battery for furnishing a sensed voltage signal corresponding to the voltage across said battery;
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current sensor means (15-16) connected in series with said load for furnishing a sensed current signal corresponding to said current drawn from said battery; temperature sensor means (24) for furnishing a sensed temperature signal; means for furnishing a reference signal; combining means (17, 18,
26) connected to said voltage sensor means, said current sensor means, and said temperature sensor means for furnishing a combined signal varying as a predetermined mathematical function of said sensed voltage signal, said sensed current signal, and said sensed temperature signal;comparing means (19) connected to said combining means and said means for furnishing a reference signal for comparing said combined signal to said reference signal and furnishing a difference signal corresponding to the difference therebetween; and limiter means (23) interconnected between said comparing means and said current regulator means, for controlling said current regulator means. - View Dependent Claims (10, 11, 12)
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Specification