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| Number | Title | Issue Date |
| 7304484 | Method and device for the temperature compensation of a measuring bridge A method for the temperature compensation of a resistance measuring bridge, such as in particular a Wheatstone bridge, is characterized in that a capacitor positioned between the input circuit and a resistance switching circuit of the Wheatstone bridge is successive... | 12/04/2007 |
| 7191072 | Pressure and temperature measurement of a piezo-resistive device using differential channel of a ratiometric analog to digital converter A temperature and pressure measuring circuit is provided. The circuit comprises an uncompensated pressure transducer, an analog-to-digital converter, a reference resistive device, and first and second switches. The transducer has variable resistive devices between f... | 03/13/2007 |
| 7140246 | Frequency output type hot-wire flow meter According to the invention, to correct the curvature characteristic in output due to individual differences between frequency output type hot-wire flow meters, a frequency output type hot-wire flow meter includes a heating resistor disposed in the measurement target... | 11/28/2006 |
| 7132876 | System for discharging electronic circuitry An electronic discharge circuit. The discharge circuit includes a first current source having first current source input and output and a current control circuit having first, second, third, and fourth control contacts. An electronic circuit element of an electronic... | 11/07/2006 |
| 7073389 | Shunt calibration for electronic pressure switches An electronic switch of the type uses a piezoresistive Wheatstone bridge configuration to sense pressure. The output of the Wheatstone bridge is applied to an electronic control circuit which contains a comparator. The comparator monitors the output of the bridge an... | 07/11/2006 |
| 7016790 | In-line hot-wire sensor for slurry monitoring An in-line hot-wire sensor for monitoring the mixing and the flow rate of slurry is disclosed. The hot-wire sensor may include a number of resistors organized into a Wheatstone bridge, as well as a frequency-domain transform mechanism. The resistors include a hot-wi... | 03/21/2006 |
| 7009184 | Amplifier device for sensors An amplifying device for a sensor (10) delivering a response in voltage or impedance has a voltage controlling means for the sensor and at least an additional impedance (12). The voltage controlling means (22) is connected to output terminals ( | 03/07/2006 |
| 7005884 | Monitoring apparatus for monitoring electrical drive current for an electric motor Monitoring apparatus is for monitoring a parameter, such as a drive current to a motor. Motor current flows through a series resistor which provides a voltage signal which varies in response to variations in the motor current. An analysis circuit is operable to anal... | 02/28/2006 |
| 6917503 | Programmable current limiting using a shunt resistor An overcurrent protection circuit using a shunt resistor and the voltage drop across a switch to program a user-defined current limiting level. This protects the switch and the input power supply, as well as the load. The shunt resistor is connected to the input or ... | 07/12/2005 |
| 6777908 | Method and apparatus for correcting and maintaining voltage balance in multiple cell battery configurations A battery cell balancing method and apparatus. A simple and inexpensive method and apparatus to balance the cells within a battery configuration where at least some of the cells are arranged in series or a combination of series and parallel. One embodiment balances ... | 08/17/2004 |
| 6556937 | Synchro/resolver bridge and automatic test system A digital synchro/resolver bridge is provided, which may be operated individually, or optionally, may be interfaced with a computer for inclusion in an automated test system. The digital bridge includes a plurality of relay modules operated by an embedded... | 04/29/2003 |
| 5686826 | Ambient temperature compensation for semiconductor transducer structures The present compensating circuit operates to reduce the span shift error due to ambient temperature changes of a span resistance compensated, bridge array circuit arrangement for a semiconductor transducer employing piezoresistive sensors. The span resist... | 11/11/1997 |
| 5461322 | Autonulling DC bridge for real-time sensor transduction and voltage measurements A feedback operated DC bridge circuit for monitoring the voltage variations in a voltage divider circuit using a voltage controlled resistance component to reach a null balance across the bridge. Amplification is provided at higher accuracy near the null ... | 10/24/1995 |
| 5378931 | Low leakage fuse blown detection circuit A fuse blown detection circuit for use in conjunction with the control transistor output circuits of a programmable controller which provides low leakage after the fuse is blown. The detection circuit comprises a pair of voltage dividers and a diagnostic ... | 01/03/1995 |
| 5146154 | Circuit with ratiometric analog inputs A circuit disclosed maintains ratiometric analog inputs to an integrated circuit using a network of resistors, some of which are external to the integrated circuit and some of which are internal to the integrated circuit, reducing expense. The analog inpu... | 09/08/1992 |
| 5115188 | Resistance sensor and switch A circuit for detecting resistance changes in an electrically resistive device is disclosed. The circuit comprises a bridge circuit with first and second MOSFET transistors in adjacent arms of the bridge and the resistive device and a comparison resistor ... | 05/19/1992 |
| 5053692 | Temperature dependent power supply for use with a bridge transducer In order to compensate for the effects of temperature variations on a transducer such as a piezo-resistive bridge, the bridge is fed from a temperature dependent power supply circuit. The power supply circuit comprises a temperature sensitive element with... | 10/01/1991 |
| 4710698 | Phase-controlled automatic switching circuit There is disclosed a phase-controlled switching circuit, comprising a controlled rectifier (e.g. bidirectional triode thyristor); an amplifier connected at its output terminal to the gate of the controlled rectifier; an ac Wheatstone bridge having at one ... | 12/01/1987 |
| 4639611 | Bridge circuit system A sensing circuit system including circuitry for sensing impedance variations of a variable impedance element. As disclosed, a bridge circuit system includes a bridge circuit to which the variable impedance element is couplable. The bridge circuit system ... | 01/27/1987 |
| 4554439 | Two wire heater regulator control circuit having continuous temperature sensing excitation independent of the application of heater voltage A heater control circuit functions in conjunction with a suitable heating coil to provide precision, automatic temperature regulation. The combination of heating and temperature sensing functions into a single system results in a two-wire heater regulator... | 11/19/1985 |
| 4535283 | Device for conversion of non-electrical quantity into electrical signal Device for conversion of a nonelectrical quantity into an electrical signal comprises measuring and compensating bridge circuits whose supply arms are connected to a power supply. A nonelectrical quantity like strain, force or pressure acts on the input o... | 08/13/1985 |
| 4530044 | Self-balancing DC-substitution measuring system A self-balancing DC-substitution measuring system includes a temperature dependant resistor (TDR) which is placed in one leg of a Wheatstone Bridge circuit, diagonally opposed first and second nodes of the bridge being driven respectively by the outputs o... | 07/16/1985 |
| 4527583 | Electropneumatic transducer system A temperature compensation circuit is provided which can be used for span temperature compensation in an electropneumatic transducer system and which includes a constant current generator circuit coupled to a bridge of piezo resistances in a pressure tran... | 07/09/1985 |
| 4516865 | Resistance thermometer A resistance thermometer in which a temperature sensing resistor is connected in parallel with a series combination consisting of a signal output resistor and a compensating resistor. By choosing the resistance ratio between two resistors to be equal to t... | 05/14/1985 |
| 4513608 | Moisture sensing and control device A moisture sensing element is provided and is constructed of a body having therein a first zone formed of porous material with a first range of pore size having a first mean pore size and a second zone formed of a porous material with a second range of po... | 04/30/1985 |
| 4454468 | Switching device for the electrical measurement of reactive impedances and a measuring bridge using such a switching device A switching device is provided, for measuring capacities, comprising n branches in parallel with nࣙ1, each branch being formed by a capacity to be measured and a switch, the assembly of switches being subjected to a control signal which successively con... | 06/12/1984 |
| 4441071 | Temperature compensation circuit for thermocouples The present invention is directed to a circuit for generating a voltage for compensating the output of a thermocouple. The circuit provides a compensating voltage to enable the thermocouple to be operated with its reference junction at ambient temperature... | 04/03/1984 |
| 4420745 | Security system A security system of the bridge circuit type has in one of its arms a conducting element whose impedance is to be monitored and in its other arms reference and/or compensating elements, for detecting an unbalance of the bridge resulting from a sudden chan... | 12/13/1983 |
| 4401940 | Voltage equalizer bridge A diode equalizing bridge wherein one pair of opposed diodes are forward-biased and a second pair of opposed diodes are reverse-biased so that the two capacitors at the opposed load terminals are charged and discharged by a current source and current sink... | 08/30/1983 |
| 4334186 | Apparatus for driving hot-wire type flow sensor An apparatus for driving a hot-wire air-flow sensor of constant temperature difference type includes a hot wire and a temperature sensitive compensating element such as a resistor for compensating temperature of air. The hot wire and the resistor are form... | 06/08/1982 |
| 3944859 | Bridge-balance detection circuit A high input impedance circuit is employed to sense the condition of a bridge such as a Wheatstone bridge containing ionization chambers for smoke detection. The circuit comprises two CMOS inverters connected to operate as a differential signal detector, ... | 03/16/1976 |
