Abb Schweiz Ag

Pricer Ab

Marici Holdings the Netherlands B.v.

Optistring Technologies Ab

Anders Lindgren

Tomas Modeer

Gustav Bergquist

Ernst Håkan Sjödin

A method in a power inverter system () is disclosed, wherein the power inverter system comprises a central unit () and a plurality of switching units () operable in an inverter mode in which they are individually switched so as to produce a combined output voltage waveform and AC (V) transmitted in a common line (), and operable in a communication mode in which the switching units are switched so as to produce a communication signal, the communication signal being transmitted in the common line to the central unit. The method comprises operating at least some of the switching units in the inverter mode such that they are switched in response to switching commands of a command signal produced by the central unit, and between two consecutive switching commands of the command signal, operating at least one of the switching units in the communication mode.

Common line communication in cascaded inverters

A system and method for estimating a position of an electronic label in an area are provided. A plurality of devices is distributed over the area. Information is obtained about signal strengths recorded at the respective devices when attempting to receive a wireless signal transmitted by the electronic label. Weights are formed for positions associated with the devices, based on the signal strengths recorded at the corresponding devices. The position of the electronic label is estimated as a weighted average including the positions, wherein the positions are weighted by the weights. In some embodiments, information is instead obtained about signal strengths recorded at the electronic label when attempting to receive wireless signals transmitted by the respective devices. The present method may for example be employed to estimate a position of a product in a retail store.

Estimation of a position of an electronic label

A method of controlling a plurality of DC/AC converters in cascade configuration, each being arranged to receive an input direct current and voltage from a respective photovoltaic panel and to deliver an electric output. The method includes receiving information representing at least one of frequency, phase, amplitude and harmonics of a required AC, and receiving information on the input direct current and voltage to each one of the plurality of DC/AC converters. Based on the received information, each one of the plurality of DC/AC converters is individually controlled in such manner that the combined output from the plurality of DC/AC converters produces an AC matching the required AC.

Growing community of inventors

Stockholm, Sweden

Anders Lindgren