Battery impedance detection using voltage and current measurements
AssigneeInfineon Technologies AG
InventorsStefano Marsili, Michael Kropfitsch
Life of this patent
Estimating the term…
Abstract
A method is disclosed, which includes driving an alternating input current into a battery, measuring a voltage across the battery by a first measurement circuit to obtain a voltage measurement value, measuring a current through the battery by a second measurement circuit to obtain a current measurement value, and measuring a current through the battery using the first measurement circuit to obtain a further current measurement value. Further, the method includes calculating an impedance of the battery based on the current measurement value, the further current measurement value, and the voltage measurement value.
Claims25
A method comprising:
- driving an alternating input current into a battery;
- measuring a voltage across the battery by a first measurement circuit to obtain a voltage measurement value;
- measuring a current through the battery by a second measurement circuit to obtain a first current measurement value;
- measuring the current through the battery using the first measurement circuit to obtain a further current measurement value;
- calculating a gain and phase error based on the first current measurement value and the further current measurement value;
- and
- calculating an impedance of the battery based on the first current measurement value, the voltage measurement value, and the gain and phase error calculated based on the first current measurement value and the further current measurement value.
An electronic circuit comprising:
- a first input configured to be coupled to a battery;
- a second input configured to be coupled to a current sensor;
- a first measurement circuit;
- a second measurement circuit;
- a crossover switch coupled to the first input, the second input, the first measurement circuit and the second measurement circuit and configured to selectively connect the first measurement circuit with one of the first input and the second input and the second measurement circuit with one of the first input and the second input;
- a control and calculation circuit configured to:
- control the crossover switch;
- calculate a gain and phase error based on a first current measurement value received from the second measurement circuit and a further current measurement value received from the first measurement circuit;
- and
- calculate an impedance of the battery based on a voltage measurement value received from the first measurement circuit, the first current measurement value received from the second measurement circuit, and the gain and phase error calculated based on the first current measurement value and the further current measurement value.
A method comprising:
- driving an alternating input current into a battery;
- measuring a voltage across the battery by a first measurement circuit to obtain a first voltage measurement value;
- measuring a current through the battery by a second measurement circuit to obtain a first current measurement value;
- measuring the current through the battery using the first measurement circuit to obtain a further current measurement value;
- measuring the voltage across the battery by a second measurement circuit to obtain a further voltage measurement value;
- calculating a first impedance based on the first voltage measurement value and the first current measurement value;
- calculating a second impedance based on the further voltage measurement value and the further current measurement value;
- and
- calculating an impedance of the battery based on the first impedance and the second impedance.
Dependencies are inferred from the claim text.