Purdue Research Foundation

Byunghoo Jung

Kaushik Roy

Babak Ziaie

Chamika Mihiranga Liyanagedera

Wing Fai Loke

Wuyang Yu

Bongchan Kim

Mohit Singh

Chiwook Park

Weeseong Seo

A system may include a non-intrusive sensor circuitry configured to provide electrical measurement data, including, for example, current data, voltage data, power factor data, active power consumption data, reactive power consumption data, or a combination thereof. A transient event detector may sweep the electrical measurement data with a first window and a second window, the first window adjacent to the second window. The transient event detector may identify a start and end of transient activity based on electrical measurement data referenced by separate adjacent windows. The transient event detector may capture a transient activity data segment comprising a portion of the electrical measurement data between first index and the second index.

Intelligent non-intrusive load monitoring system

System and methods for high accuracy, non-intrusive current sensing are provided. A system may include two magnetic field sensors configured for differential sensing. The system may further include frontend circuitry configured to remove direct current (DC) offset of the magnetic field sensors, upconvert the outputs of the magnetic field sensors, and filter out at least one frequency component from the up-converted signals. The system may receive output signals from the front-end circuitry corresponding to each sensor. The system may further calculate a differential signal based on the output signals. The system may apply optimal detection based on the differential signal and a reference signal to calculate a measurement of current flow. The system may determine a phase angle measurement between the differential signal and the reference signal to calculate a direction of the current flow in the conductor and output various measurement information related to the detected current.

High accuracy non-invasive current sensor system

Disclosed is a system and methods for measuring electrochemical state of rechargeable batteries such as state of charge (SoC) and state of health (SoH). In various aspects, the system may include an inductive coil attached to the battery and a battery current sensor. Alternating current with a fixed frequency is applied to the coil to generate magnetic fields, and the magnetic fields induce losses including Eddy current loss and a loss related to battery currents. The system compensates for the effect of the loss related to battery currents for battery electrochemical state estimation. In another aspect, the system uses both coil-based measurement and ampere hour counting (AHC) measurement for SoC measurement. The system conducts coil-based SoC measurement only occasionally to reset the accumulated error of AHC-based SoC measurement. In yet another aspect, the system combines coil-based measurement with other measurements.

System and methods for rechargeable battery diagnostics

Systems, devices, kits, and methods for detecting and quantifying targeted compounds within a liquid (such as urine) are provided. Such systems, devices, and methods may be autonomous, noninvasive, and provide quick and accurate results. The systems and devices are at least partially disposable (single-use) and configured to be embedded within or applied to a conventional diaper or the like. Methods for using the systems and devices hereof include receiving a liquid to be tested within a portion of a disposable device, allowing the liquid to traverse through one or more channels defined within the device in a controlled fashion, reacting the liquid with one or more chemical reagents, using a sensing unit to collect photocurrent data regarding the chemical reach on(s), and wirelessly transmitting that data to a computing unit for storage and quantitative analysis.

Devices, systems, and methods for detecting targeted compounds

A method of determining state of health (SoH) of a battery is disclosed which includes receiving a predetermined open circuit voltage (V) vs. a state of charge (SoC) characteristics for a pristine battery, establishing a single battery model including physical diffusion characteristics and electrical characteristics based on lumped parameters thereby modeling diffusion resistance and capacitance of particles in the electrodes of the battery as well as electrical characteristics based on electrical resistance and capacitance from one electrode assembly to another, thereby generating equations describing voltage at the associated double-layers, solving the double-layer equations, thereby generating solutions for the double-layer electrical characteristics, and establishing a relationship between the solved double-layer characteristics and the SoC, thereby determining a SoH of the battery based on said relationship.

System and methods for rechargeable battery analysis, monitoring, and diagnostics

A method of sensing a current in a conductor includes controlling a digital to analog converter output to cancel residual offset voltage in a magnetic tunnel junction device prior to sensing the current with the magnetic tunnel junction device. The method includes switching input to the magnetic tunnel junction device between a fixed voltage and an output of a digital to analog converter while switching input to a band pass filter between a lower and an upper voltage output of the magnetic tunnel junction device. The output of the digital to analog converter is modified to provide a low-amplitude unsaturated sine-wave at an output of the band pass filter, at which point changes in the output of the band pass filter are associated with the amount of current in a sensed conductor.

Vehicle battery current sensing system

A current sensing system, comprising at least one magnetic tunnel junction device placed adjacent to a current carrying conductor electrically connected to a battery of a vehicle. The magnetic tunnel junction device is configured to measure a magnetic field around the conductor. A monitoring device is operatively connected to the magnetic tunnel junction device, wherein the monitoring device is configured to receive the magnetic field measurement and determine an estimate of the current flowing through the conductor.

A distributed photodiode with FIR filtering function enabled by a lumped transmission line is provided. The distributed photodiode includes inductors, a plurality of photodiode segments, photodiode biasing components, and termination impedance. The electrical bandwidth due to the junction parasitic capacitance of the photodiode is increased as the parasitic capacitance is absorbed in the transmission line structure. Moreover, the delay elements inherent in the transmission line enable implementation of an analog finite impulse response (FIR) filter that has equalization capability to allow a customized photodiode frequency response compensation.

Distributed photodiode with built-in equalization

A positioning system for determining the location of a receiver relative to a transmitter. The system includes a transmitting coil having a known orientation with respect to the earth's coordinate system and configured to transmit a periodic signal during a positioning event, at least one receiver including a sensing unit for measuring the magnetic field vector produced by the transmitting coil and the orientation of the receiver with respect to the earth's coordinate system, and at least one computing unit configured to estimate a position and orientation of the receiver with respect to the transmitter's coordinate system using the measured magnetic field vector, the measured orientation with respect to the earth's coordinate system, and the known orientation of the transmitting coil with respect to the earth's coordinate system.

Wireless position sensing using magnetic field of single transmitter

Illustrative embodiments of systems and methods for wireless magnetic tracking are disclosed. In one illustrative embodiment, a wireless magnetic tracking system may include a plurality of transmitting coils each configured to generate a magnetic field when energized, an active transponder configured to simultaneously (i) obtain measurements of the magnetic field when one of the plurality of transmitting coils is energized and (ii) transmit a wireless signal containing data concerning the measurements, and a computing device configured to (i) cause each of the plurality of transmitting coils to be sequentially energized, (ii) receive the data concerning the measurements, and (iii) determine a position and an orientation of the active transponder relative to the plurality of transmitting coils in response to the data concerning the measurements.

Growing community of inventors

West Lafayette, IN, United States of America

Byunghoo Jung