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4866389 Circuit and method for measuring battery voltage by time of discharge of a capacitor  
A voltage measurement circuit is provided which can be used in a single supply situation, which has a measurement range from rail to rail and which uses a reference voltage which can lie anywhere...
4839597 Battery condition monitoring system  
The present invention is an improved method and apparatus for monitoring a battery supply by comparing the monitored battery voltage against average discharge information for the battery supply...
4823086 Battery monitoring and condition indicator system for multi-battery pack  
Disclosed is a system for individually monitoring the condition of a single battery or each battery and related supply cables in a multi-battery battery pack. The system includes a means for...
4803459 Electronic multi-purpose warning device for motor vehicles and motor boats  
A device to be used in a motor vehicle or motorboat for performing a wide variety of warning and monitoring functions. It includes apparatus to electrically connect to a positive battery cable...
4743842 Tri-state circuit tester  
A testing circuit is capable of testing digital circuits, such as gates, in logic 1, logic 0 and Hi-Z conditions. To accomplish this end two comparators are connected to the output of the digital...
4714915 Portable electrostatic field safety monitor  
A portable monitoring system for detecting a radiated electrostatic field and producing an audible warning when the detected field exceeds a selected value is characterized by a switching device...
4707795 Battery testing and monitoring system  
A battery testing and monitoring system specifically designated to continuously monitor overall battery voltage, conditions of individual cells or cell groups such as voltage, current and...
4676395 Display and dispensing unit  
A display and dispensing unit is provided which carries a first row of containers that are adapted to contain articles for dispensing and a second row of containers spaced above and recessed...
4665370 Method and apparatus for monitoring and indicating the condition of a battery and the related circuitry  
A method and apparatus for testing the battery and the related circuitry of an internal combustion automobile every time the vehicle is started. The test is automatic and the results are available...
4660027 Reduced power consumption low battery alert device  
A reduced power consumption low battery indicator comprising in the preferred embodiment a transducer driver which drives a transducer to provide an audible alert. A microprocessor is used to...
4647860 Apparatus for automating standard voltage reference cell intercomparisons  
An apparatus is presented for performing standard cell intercomparisons. An operator selects two cells in order to compare their relative voltage values. A first terminal on each cell is coupled...
4638237 Battery condition indicator  
A battery condition indicator provides an indication of both the charge used and the life remaining in a rechargeable battery. The time of use of the battery between charges is measured to provide...
4617626 Charge control microcomputer device for vehicles  
A charging system control system includes a microcomputer for determining the most proper voltage regulator reference value setting according to input data received thereby, and controls a clutch...
4608639 Charge control microcomputer device for vehicle  
A charge control microcomputer is provided for a vehicle charging system to control the reference voltage employed by the voltage regulator so that a suitable battery charging voltage is generated...
4607336 Change control microcomputer device for vehicle  
A charging control system includes a clutch interposed between the generator and the engine, and a microcomputer for receiving input data and determining a suitable reference voltage for the...
4575680 Battery condition indicator and on-off relay circuit  
A battery condition indicator and on-off relay circuit for electric guitars with on-board active electronics, adaptable to many other battery-operated appliances, includes an electronic relay...
4573126 Process and device for measuring the state of charge of an electrochemical generator while operating  
Process and device for measuring the state of charge of an electrochemical generator such as a lead-acid battery, while operating. The device includes means for measuring the voltage of the...
4560937 Battery state of charge metering method and apparatus  
The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit...
4558281 Battery state of charge evaluator  
A combined battery state of charge evaluator and motor control system for an electric vehicle comprises a traction battery 10, a motor controller 14, a traction motor 11, a micro computer 16 and...
4553098 Battery checker  
A battery checker utilizes a reference voltage generator device which detects a voltage corresponding to an energy gap of a semiconductor, or a voltage of a value close thereto, or a voltage based...
4544893 Battery voltage detector  
A device for detecting a voltage of a battery for use in electronic apparatus and appliances, the detector being constructed with a display device which include segments to display input data and...
4536757 Device for signalling a specific charge condition of an accumulator battery  
A device for signalling a specific charge condition of an accumulator battery (B) comprises a comparator circuit (C) for comparing the battery voltage (VB) with a reference voltage. A switching...
4521735 Battery voltage level detecting apparatus  
A battery voltage level detecting apparatus makes possible the detection of the voltage level of a battery and the detection of a minimum operating voltage by means of a single comparison circuit...
4517517 Nickel-cadmium battery conditioner and tester apparatus  
A battery tester apparatus having a discharge circuit with a visual indicator that the discharge cycle is in progress operating in combination with a comparator to determine when the terminal...
4514694 Quiescent battery testing method and apparatus  
The invention relates to apparatus for determining the state of charge of electric storage batteries.The apparatus makes use of known quiescent battery (16) terminal voltage recovery...
4489141 Passive potentiostat  
This invention provides a passive potentiostat which is adapted to function as a self-adjustable unipolar resistive load.The passive potentiostat is suitable for controlling the half-cell...
4488110 Voltage monitor with visible level indicator  
There is provided a voltage monitor which monitors a first voltage. A means for providing a reference second voltage is provided. Also, a signal third voltage which is obtained from and is...
4450063 Probe for alumina concentration meter  
An improved probe for an alumina concentration meter is disclosed. The active anode and cathode surfaces of the probe lie on a common surface. A bath temperature measuring device is included...
4445090 Voltage level monitoring and indicating apparatus  
A voltage level monitoring and indicating apparatus (10) including a voltage-to-frequency converter (12), an input conditioning circuit (16) that shifts voltage signals received from different...
4433294 Method and apparatus for testing a battery  
The operating condition and/or characteristics of a battery is tested by obtaining the dynamic voltage-current characteristic of the battery as a function of the charge condition thereof. A...
4424491 Automatic voltage imbalance detector  
A device for indicating and preventing damage to voltage cells such as galvanic cells and fuel cells connected in series by detecting sequential voltages and comparing these voltages to adjacent...
4423378 Automotive battery test apparatus  
The condition of a storage battery of an internal combustion engine powered vehicle is tested automatically, and an indication of battery condition is provided to the service technician. The...
4396889 Nonadjusting battery life detector  
A battery life detector operates by sensing battery voltage. The detector consists of a pair of series combinations of a constant voltage source and a constant current source which are connected...
4376265 Power source voltage checking device particularly for checking the voltage of a battery in a camera  
In the disclosed device, a signal forming circuit produces a signal having a frequency corresponding to the voltage of a power source. A level detector detects the level of the voltage of the...
4363407 Method and system for testing and sorting batteries  
A method and system for testing and sorting a production run of sheet-like batteries includes: testing each battery to obtain a first value of electrical energy; placing machine readable indicia...
4338596 Circuit for indicating the condition of the battery in a photographic camera  
When the battery voltage is sufficient, and not nearing the point of insufficiency, a light-emitting diode is steadily illuminated. As the battery voltage decreases, the steady component of...
4333149 Microprocessor-based state of charge gauge for secondary batteries  
A state of charge gauge for measuring the state of charge of secondary batteries, such as the type employed in electric vehicles, includes a microprocessor which, when supplied with data varying...
4321543 Three-condition display system  
Apparatus for detecting and displaying a high, normal, or low condition of battery voltage or engine temperature in an automobile by energizing an H, a dash, or an L, respectively, on a 7-segment...
4320334 Battery state-of-charge indicator  
Apparatus for providing a continuous indication of battery state-of-charge under load in a system in which the battery is subject to varying load conditions. The apparatus stores a value...
4318092 Means for checking battery voltage level  
Means for checking the voltage level of a battery used in an apparatus including an operational amplifier powered from the battery and an indicating means operatively connected to the output of...
4316185 Battery monitor circuit  
A battery monitor circuit for rechargeable multicell batteries that provides a reliable indication of battery failure independent of temperature, load and age, by continuously comparing the...
4290109 Electric monitoring method and apparatus for electric system of automotive vehicle  
In an electric monitoring method and apparatus for a secondary battery, a computer is utilized to monitor abnormal phenomena of a terminal voltage across the battery in relation to a load current...
4258999 Power source voltage checking circuit  
A voltage checking circuit for checking a power source battery whose terminal voltage changes with time at an early stage subsequent to closing the battery load circuit. The checking circuit...
4194146 Device for controlling the charging and discharging of a storage battery  
A device for controlling the charging and discharging of a storage battery has an input to which there is applied an input voltage proportional to the magnitude and sign of the current flowing...
4129824 Electronic hydrometer  
An electronic hydrometer for monitoring the specific gravity of a solution containing ions includes a probe having spaced apart electrodes adapted to be inserted into the solution to be monitored...
4066948 Concentration measuring apparatus and process  
An apparatus and process for measuring the percent concentration of an electrolyte in solution is disclosed. The apparatus includes a crystal oscillator generating a square wave and a wave shaper...
4044304 Device for checking a d c source voltage relative to a predetermined value  
A device for testing the voltage of a voltage source comprises a bridge circuit, a differential switching circuit and an indicator element. The bridge circuit includes a first circuit comprising a...
4028616 Battery analyzer  
An analyzer is disclosed herein for testing an automobile battery by comparing the battery voltage to a precise reference established by a resistive divider and operational amplifiers. In this...
4027231 Battery charge indicator  
A battery charge indicator for determining the remaining useful life of a battery which accurately measures the battery voltage in an operational environment and provides an indicator of relative...
4020479 Fire detector  
An improved early warning fire detector of the ionization type is provided wherein detection circuitry having adjustable sensitivity is connected to an ionization chamber responsive to products of...