Bidirectional battery state-of-charge monitor
First Claim
1. A bidirectional battery state-of-charge monitor comprising a circuit including an integrator for storing a state-of-charge measurement;
- and a charge signal channel and a separate discharge signal channel both connected to said integrator and both arranged for connection to receive a battery terminal voltage signal, said charge signal channel including comparison means operable in response to a battery terminal voltage signal above a charge threshold function voltage to produce a charge output signal to change the integrated measurement in the integrator in a first direction to indicate an increased charge, the discharge signal channel including comparison means operable in response to a battery terminal voltage signal below a discharge threshold function voltage to produce a discharge output signal to change the integrated measurement in the integrator in a second direction to indicate a decreased charge, both said charge and discharge threshold function voltages being functions of the stored integrator state-of-charge measurement.
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Abstract
The monitor is a circuit including an integrator for storing a state-of-charge measurement and a charge signal channel and a separate discharge signal channel both arranged for connection to receive a battery terminal voltage signal. The charge signal channel is operable in response to a battery terminal voltage signal above a charge threshold function voltage to produce a charge output signal to change the integrated measurement in the integrator in a first direction to indicate an increased charge. The discharge signal channel is operable in response to a battery terminal voltage signal below a discharge threshold function voltage to produce a discharge output signal to change the integrated measurement in the integrator in a second direction to indicate a decreased charge. Both the charge and discharge threshold function voltages are functions of the stored integrator state-of-charge measurement.
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Citations
35 Claims
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1. A bidirectional battery state-of-charge monitor comprising a circuit including an integrator for storing a state-of-charge measurement;
- and a charge signal channel and a separate discharge signal channel both connected to said integrator and both arranged for connection to receive a battery terminal voltage signal, said charge signal channel including comparison means operable in response to a battery terminal voltage signal above a charge threshold function voltage to produce a charge output signal to change the integrated measurement in the integrator in a first direction to indicate an increased charge, the discharge signal channel including comparison means operable in response to a battery terminal voltage signal below a discharge threshold function voltage to produce a discharge output signal to change the integrated measurement in the integrator in a second direction to indicate a decreased charge, both said charge and discharge threshold function voltages being functions of the stored integrator state-of-charge measurement.
- 2. A battery state-of-charge monitor comprising an integrator for storing a state-of-charge measurement, a charge signal channel arranged for connection to receive a battery terminal voltage signal and connected to said integrator and operable in response to a battery terminal voltage signal in the charge range above a charge threshold function voltage which is a function of the integrator measurement to produce a charge output signal to change the integrated measurement in a first direction to indicate an increased charge, a discharge signal channel arranged for connection to receive a battery terminal voltage signal and connected to said integrator and operable in response to a battery terminal voltage signal in a discharge range below a discharge threshold function voltage which is a function of the integrator measurement to produce a discharge output signal to change the integrated measurement in a second direction to indicate a decreased charge, output means connected to said integrator for indicating the achieved integration value, a charge threshold function generator comprising a part of said charge signal channel and connected to receive a feedback signal from said output means, said charge threshold function generator being operable to generate said charge threshold function voltage as a function of said feedback signal from said output means, a discharge threshold function generator comprising a part of said discharge signal channel and connected to receive a feedback signal from said output means, said discharge threshold function generator being operable to generate said discharge threshold function voltage as a function of feedback signal from said output means, said charge and discharge function generators being operable to generate functions which are separated, with the charge function always being higher than the discharge function.
Specification