Infineon Technologies Ag

Andreas Berger

Stefano Marsili

Guenter Hofer

Klaus Hoermaier

Marc Kanzian

Christoph Sandner

Robert Priewasser

Christoph Unterrieder

Harald Gietler

Francesco Conzatti

Matthias Rose

Nicolo Zilio

Akshay Misra

Christian Winkler

In some examples, a device can be used for measuring the impedance of a first battery cell. The device includes a first analog-to-digital converter (ADC) and a second ADC. The device also includes a multiplexer configured to connect the first ADC to the first battery cell in a first instance and to connect the second ADC to a current sensor in the first instance. The current sensor is configured to sense current through the first battery cell. The multiplexer is also configured to connect the first ADC to the current sensor in a second instance and to connect the second ADC to the first battery cell in the second instance or in a third instance.

Impedance measurement using a multiplexer and analog-to-digital converters

In accordance with an embodiment, a method includes receiving, by at least one of a plurality of battery monitoring circuits a frequency synchronization signal and measurement frequency information from a host controller, wherein the at least one of the plurality of battery monitoring circuits is connected to at least one of a plurality of battery blocks; generating, by the at least one of the plurality of battery monitoring circuits, a periodic signal based on a clock signal having a clock frequency, the measurement frequency information, and the frequency synchronization signal; obtaining, by the at least one of the plurality of battery monitoring circuits, at least one measurement value of the at least one of the plurality of battery blocks using the periodic signal; and transmitting, by the at least one of the plurality of battery monitoring circuits, the at least one measurement value to the host controller.

Method of monitoring a battery, monitoring system and monitoring circuit

A method for measuring a complex impedance of a plurality of battery cells in a battery pack comprises controlling an excitation current through the plurality of battery cells in the battery pack; receiving, in a single common measurement circuit, a plurality of voltage signals corresponding to the plurality of battery cells; measuring the excitation current; and calculating a complex impedance of each of the battery cells in the plurality of battery cells based on the plurality of voltage signals and the measured excitation current in a single measurement cycle using either one analog-to-digital converter (ADC) per battery cell or two matched ADCs per battery cell.

Multi-cell AC impedance measurement system

A control system, and corresponding method, for a Multi-Level Hybrid Flying Capacitor (MLHFC) converter. The control system includes a controller configured to control an output of the MLHFC converter; a feedback region detector configured to detect a change in a feedback region of the MLHFC converter; and a controller adjuster configured to, in response to the detected change, adjust the control system to counteract instability.

Muti-level hybrid flying capacitor converter control

In an example, a device for operating a switching converter is configured to determine a set of perturbed duty cycle values for a converter. A perturbation sequence is superimposed simultaneously onto a duty cycle value for each phase of the converter to form the set of perturbed duty cycle values. The device is further configured to determine an output voltage of the converter that occurs when the converter operates based on the set of perturbed duty cycle values, determine a coefficient vector of system parameters for the converter based on the output voltage and the set of perturbed duty cycle values, and tune a controller based on the coefficient vector. The duty cycle value for each phase of the converter is based on a respective command duty cycle value of a set of command duty cycle values output by the controller.

Controller tuning using perturbation sequence

In an example, a device for operating a switching converter is configured to receive a composite command duty cycle value. The device is further configured to generate an effective duty cycle value based on a voltage at a switching node. The device is further configured to generate a duty cycle mismatch value using the composite command duty cycle value and the effective duty cycle value so as to generate a plurality of duty cycle mismatch values. Each duty cycle mismatch value of the plurality of duty cycle mismatch values corresponds to a candidate natural frequency value of the converter. The device is further configured to output a candidate natural frequency value of the converter that corresponds to a maximum duty cycle mismatch of the plurality of duty cycle mismatch values.

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Klagenfurt, Austria

Andreas Berger