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Karthik Kadirvel

from Cupertino, CA
Age ~46
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Also known as:
Karthik L
Related to:
Ponnuswamy KadirvelSelvi Kadirvel, 42Sasirega Kadirvel
Connected to:
Suresh Kadirvel, 52Craig Kadish, 70Deborah L Kadish, 69Enid L Kadish, 99Jean P Kadish, 48Kyle T Kadish, 45Marcia Kadish, 61Marnie I Kadish, 47Nancy R Kadish, 63Zane M Kadish, 38

Karthik Kadirvel Phones & Addresses

  • Cupertino, CA
  • 6945 Chantel Ct, San Jose, CA 95129
  • 181 Secret Dr, Melbourne, FL 32904
  • Gainesville, FL

Business Records

Name / Title
Company / Classification
Phones & Addresses
Karthik Kadirvel
Karson Consulting, LLC
181 Secret Dr, Melbourne, FL 32904

Publications

Us Patents

Methods And Apparatus To Detect Voltage Conditions Of Power Supplies

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US Patent:
8253435, Aug 28, 2012
Filed:
Sep 13, 2010
Appl. No.:
12/880561
Inventors:
Karthik Kadirvel - Melbourne FL, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
G01R 31/40
US Classification:
32476401, 324109, 324 7666
Abstract:
Methods and apparatus to detect voltage conditions of power supplies are disclosed. An example power supply monitor to detect fault conditions in a power supply includes a capacitive element communicatively coupled to the power supply, the capacitive element being configured to change state between a collapsed state and an open state in response to the power supply having a first voltage associated with a first fault condition of the power supply; a detector communicatively coupled to the capacitive element to detect a voltage spike generated from the state change of the capacitive element; and a signal generator to generate a fault signal in response to the voltage spike to indicate the power supply being in the first fault condition.

Multi-Cell Power System Controller

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US Patent:
8264200, Sep 11, 2012
Filed:
May 15, 2009
Appl. No.:
12/466871
Inventors:
Karthik Kadirvel - Melbourne FL, US
Umar Jameer Lyles - Palm Bay FL, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
H02J 7/00
US Classification:
320116
Abstract:
Various apparatuses and methods for detecting cell connection status of a multi-cell battery are disclosed herein. For example, some embodiments provide an apparatus for detecting cell connection status of a multi-cell battery. The apparatus includes a battery cell input for each cell, a cell connection status detector for each cell, and at least one comparator. Each of the cell connection status detectors is connected to a battery cell input and has a current-based status indicator output. The at least one comparator is connected to the current-based status indicator outputs. Each of the plurality of cell connection status detectors floats in a different supply voltage range. The at least one comparator is referenced to a lower voltage potential than at least one of the plurality of cell connection status detectors.

Electrical Energy Storage Systems And Methods

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US Patent:
8305039, Nov 6, 2012
Filed:
Jul 15, 2010
Appl. No.:
12/836897
Inventors:
Karthik Kadirvel - Melbourne FL, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
H02J 7/00
US Classification:
320132, 320134
Abstract:
Systems and methods for determining a state of charge (SOC) of an electrical energy storage device are disclosed. In one embodiment, a system is provided for determining the SOC of an electrical energy storage device comprises at least one memristor coupled in series with the electrical energy storage device to monitor charge current and discharge current of the electrical energy storage device. The system also includes a readout controller configured to determine the SOC of the electrical energy storage device based on the resistance of the memristor.

Systems And Methods Of Battery Cell Anomaly Detection

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US Patent:
20100173183, Jul 8, 2010
Filed:
Jan 6, 2009
Appl. No.:
12/349039
Inventors:
Karthik Kadirvel - Gainesville FL, US
Umar Jameer Lyles - Palm Bay FL, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
G01N 27/416
H01M 6/02
H01M 8/04
H01M 10/48
US Classification:
429 90, 324434, 702 63
Abstract:
Systems and methods for cell anomaly detection are provided. The disclosed systems and methods of cell anomaly detection may use a single circuit to detect both cell-open and imbalance conditions. Disclosed embodiments may incorporate a continuous or a sampled time system (i.e. cell anomaly detection is performed when an enable signal is active). An example embodiment includes receiving voltages of a plurality of cells of a battery pack; converting the received voltages to currents; determining a maximum current of the currents; determining whether at least one of the currents is anomalous; and reporting the at least one anomalous current as indicative of a bad cell.

Systems And Methods Of Overvoltage And Undervoltage Detection

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US Patent:
20100225300, Sep 9, 2010
Filed:
Mar 6, 2009
Appl. No.:
12/399361
Inventors:
Umar Jameer Lyles - Palm Bay FL, US
Karthik Kadirvel - Melbourne FL, US
Assignee:
TEXAS INSTRUMENTS INCORPORATED - Dallas TX
International Classification:
G01R 19/00
US Classification:
324 7611
Abstract:
Systems and methods for overvoltage and undervoltage detection are provided. The disclosed systems and methods of overvoltage and undervoltage detection may be implemented with a fully differential circuit that includes a coarse comparator and a band gap based fine comparator. The coarse comparator may determine if the battery is closer to an OV condition or an UV condition. Based on the output of the coarse comparator, the trip point of the fine comparator is adjusted. The outputs of both comparators are pull-up circuits whose output is decoded to determine if an OV or a UV condition has occurred. The disclosed systems and methods of overvoltage and undervoltage detection accomplish valid circuit outputs even when the voltage across the battery reduces to zero volts. This may be achieved by using an active low signal for the UV condition and an active high signal for the OV condition. Thus, when the battery voltage goes to zero, the circuit evaluates to the correct output.

Current Based Overvoltage And Undervoltage Detector

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US Patent:
20110012605, Jan 20, 2011
Filed:
Dec 21, 2009
Appl. No.:
12/643766
Inventors:
Umar J. Lyles - Palm Bay FL, US
Karthik Kadirvel - Melbourne FL, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
G01N 27/416
G01R 19/00
US Classification:
324433, 327 62
Abstract:
With batteries or cells, particularly lithium ion cells, it is important to determine when one or more cells have entered a fault condition (i.e., overvoltage or undervoltage). Conventional circuits employ measuring circuits that use multiple bandgap circuits and high voltage components. These conventional circuits, however, consume a great deal of area because of the use of these multiple bandgap circuits and the high voltage components. Here, a circuit is provided that reduces the number of bandgap circuits and reduces the number of high voltage components, reducing the area consumed and reducing the overall cost of production compared to conventional circuits.

Apparatus For Generating A Plurality Of Different Voltage Level Clock Signals

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US Patent:
20120013380, Jan 19, 2012
Filed:
Jul 15, 2010
Appl. No.:
12/836865
Inventors:
Karthik Kadirvel - Melbourne FL, US
Umar Jameer Lyles - Palm Bay FL, US
International Classification:
H03K 3/00
US Classification:
327295
Abstract:
A system is provided for generating a plurality of different voltage level clock signals. The system comprises an electrical energy storage pack having a plurality of series coupled electrical energy storage cells that provide a plurality of different output voltage level, a reference oscillator that provides a reference clock signal and a plurality of voltage clamps that receive the plurality of different output voltage levels and output the plurality of different voltage level clock signals at respective output nodes. The plurality of voltage clamps are configured to clamp each of a given output node to a respective high-side voltage level in response to pulling up of the given output node toward a respective high output voltage level and to clamp each of the given output node to a respective low-side voltage level in response to pulling down of the output node toward a low output voltage level.

Auto-Zeroed Amplifier With Low Input Leakage

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US Patent:
20130241637, Sep 19, 2013
Filed:
Jul 25, 2012
Appl. No.:
13/557446
Inventors:
Vadim Valerievich Ivanov - Tucson AZ, US
Karthik Kadirvel - Melbourne FL, US
Assignee:
TEXAS INSTRUMENTS INCORPORATED - Dallas TX
International Classification:
H03F 3/45
US Classification:
330 69
Abstract:
An amplifier having an inverting input and a non-inverting input; a capacitor coupled to inverting input of the amplifier; an input voltage conveyance control circuit, having a first switch and a second switch, the first switch coupled to the capacitor, and the second switch coupled to the non-inverting input of the amplifier; a reference voltage conveyance control circuit having a third switch and a fourth switch, a shared node coupled between third switch and fourth switch, the fourth switch coupled to the non-inverting input of the amplifier; a fifth switch coupled to an output of the amplifier; a leakage control circuit having a sixth switch and seventh switch, the sixth switch coupled between the inverting amplifier input and the fifth switch, the seventh switch coupled to the sixth switch and the capacitor; and a first resistor coupled from the output of the amplifier to the first switch.
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Karthik Kadirvel from Cupertino, CA, age ~46 Get Report