Architecture and method to determine leakage impedance and leakage voltage node
AssigneeAnalog Devices, Inc.
InventorLawrence C. Streit
Life of this patent
Estimating the term…
Abstract
A circuit, system and method for detecting the presence of a leakage path in a multi-cell voltage source is described. The system includes a detection circuit, the detection circuit having a first amplifier and a second amplifier, a first input of the first amplifier connected to a first terminal of the voltage source and the first input of the second amplifier connected to a second terminal of the voltage source, a second input of each of the first and second amplifiers connected to a reference voltage point, and an output of each of the first and second amplifiers connected to a respective first and second output of the detection circuit; and a processor having inputs connected to the first and second outputs of the detection circuit.
Claims16
A method for identifying a presence of a leakage path in a multi-cell voltage source, comprising:
- measuring the voltage of the voltage source using a first circuit path configuration to obtain a first voltage measurement, wherein the first circuit path configuration comprises a pair of amplifiers connecting in inverting configurations;
- when the first voltage measurement shows a deviation from a predetermined voltage,
- configuring the circuit path to a second configuration;
- measuring the voltage of the voltage source using the second circuit path configuration to obtain a second voltage measurement;
- and
- deriving a leakage impedance and a leakage voltage from the first and second voltage measurements;
- and
- if a deviation is not detected, repeating another iteration of measuring the voltage of the voltage source to obtain a new first voltage measurement;
- and
- after a predetermined number of iterations in which a deviation is not detected, configuring the circuit path to another circuit path configuration to obtain a revised measurement of the voltage source;
- and
- using the revised measurement of the voltage source to determine if the revised measurement deviates from the predetermined voltage.
A system for determining a leakage impedance of a voltage source, comprising:
- a voltage source formed from multiple voltage cells;
- a detection circuit having a first circuit path configuration to obtain a first measurement of the voltage source and a second circuit path configuration to obtain a second measurement of the voltage source that is implemented when the first measurement of the voltage source shows a deviation from a predetermined voltage;
- and
- a processor for identifying a leakage impedance of the voltage source using the first voltage measurement and the second voltage measurement,
- wherein the detection circuit further comprises a first amplifier and a second amplifier, a first input of the first amplifier connected to a first terminal of the voltage source and the first input of the second amplifier connected to a second terminal of the voltage source, a second input of each of the first and second amplifiers connected to a reference voltage point, and an output of each of the first and second amplifiers connected to a respective first and second output of the detection circuit,
- wherein the first reference voltage source and the second reference voltage source supply respective first voltages to the first amplifier and the second amplifier, respectively, when the detection circuit is in a first configuration;
- and
- the first reference voltage source and the second reference voltage source supply respective second voltages to the first amplifier and the second amplifier, respectively, when the detection circuit is in a second configuration, wherein the voltage supplied by the first reference voltage source is different from the voltage supplied by the second reference voltage.
A circuit for detecting a leakage impedance and leakage voltage of a multi-cell voltage source, comprising:
- a first amplifier having a first input connected to a first terminal of the voltage source, a second input connected to a first reference voltage source, and an output connected to an output of the circuit, wherein the first reference voltage has a first reference voltage value;
- a second amplifier having a first input connected to a second terminal of the voltage source, a second input connected to a second reference voltage source, and an output connected to another output of the circuit, wherein the second reference voltage has a second reference voltage value;
- a first input resistor connected between the first terminal of the voltage source and the first input of the first amplifier;
- a second input resistor connected between the second terminal of the voltage source and the first input of the second amplifier;
- a first feedback resistor connected between the output of the first amplifier and the first input of the first amplifier;
- and
- a second feedback resistor connected between the output of the second amplifier and the first input of the second amplifier.
Dependencies are inferred from the claim text.