Showing papers on "State of charge published in 1976"
Patent•
20 May 1976
TL;DR: In this paper, a system for controlling the charging of a rechargeable battery in an implanted human tissue stimulator by means of an external power source is described, where the external unit is operated in one of a plurality of modes to cause the battery to be charged by a current with an optimum safe amplitude irrespective of determined failure of one or more of the battery protection devices.
Abstract: A system is disclosed for controlling the charging of a rechargeable battery in an implanted human tissue stimulator by means of an external power source. Included in the stimulator are battery protection devices designed to sense the state of charge of the battery and limit the charging currrent amplitude so as not to exceed a selected maximum based on different criteria including battery state of charge signals from the implanted stimulator which are indicative of the current amplitude and battery state of charge from one of the protection devices are transmited to an external unit. Based on these signals the external unit is operated in one of a plurality of modes to cause the battery to be charged by a current with an optimum safe amplitude irrespective of determined failure of one or more of the battery protection devices.
192 citations
Patent•
23 Aug 1976
TL;DR: In this paper, a battery charger receives direct current power from an external source through a power connector and supplies it to a boost circuit which is removably and conductively connected to a battery.
Abstract: A battery charger receives direct current power from an external source through a power connector. Switch means receives the power from the power connector and supplies it to a boost circuit which is removably and conductively connected to a battery. A control circuit is connected to receive a battery voltage signal from the battery and a battery temperature signal from a temperature sensor positioned to detect battery temperature. The control circuit determines the state of charge of the battery from the voltage and temperature signals. The control circuit supplies (1) switching signals to the switch means to cause the switch to be conductive, and (2) boosting signals to the boost circuit to cause the boost circuit to charge the battery in accordance with a preselected charging program related to the state of charge of the battery. A safety circuit may also be adapted to sense unsafe battery and battery charger parameters and cause the control circuit to generate a switching signal to cause the switch means to be nonconductive upon the occurrence thereof. The battery charger is particularly adaptable for use with vehicles.
100 citations
Patent•
15 Jul 1976
TL;DR: In this article, the divergence of a light beam passing through a known depth of electrolyte was measured by making the optical system fit in the space normally occupied by the battery vent plug, thus the depth to which the beam then dips into the electrolyte can be fixed.
Abstract: The refractive index of the electrolyte depends on its density which in turn is dependent upon the state of charge and can thus be used to give indication of that state. By measuring the divergence of a light beam passing through a known depth of electrolyte the state of charge can be assessed. This process is simplified by making the optical system fit in the space normally occupied by the battery vent plug thus the depth to which the beam then dips into the electrolyte can be fixed. The optical unit comprises a head fitting in the vent opening which carries the light source and the light sensitive receiver. The rest of the light conducting body carries the diaphragm for determining the initial beam parameters, the refracing surface and the reflecting surface.
1 citations