Telefonaktiebolaget Lm Ericsson (publ)

Optis Wireless Technology, LLC

Sverker Sander

Martin Svensson

Henrik Isaksson

Kjell-Arne Remnås

Björn Olsson

Anders Aronsson

Kjell-Arne Fasth

Claes-Göran Sköld

Christian Stranne

The present invention relates to a system, a measurement probe and a method for measuring an electrical property of an electrical circuit, comprising measuring the electrical property by means of a measurement probe connected to the electrical circuit, converting the measured electrical property of the electrical circuit to an optical signal. The method further comprises sending the optical signal, and receiving the optical signal by means of an image sensor configured to record images comprising the measurement probe that transmits the optical signal. The method further comprises processing the recorded images in order to decode the measurement data from the received optical signal.

Optical electrical measurement system, a measurement probe and a method therefor

A method and a current control circuittherefor. The method for a current control circuitcomprising determininga state of the current control circuit, selecta first mode of operationif the determined state is a first state indicative of a hot plug-in of the input terminalto a connectable DC voltage bus. The method further comprises selectinga second mode of operationif the determined state is a second state different from the first state. The method further comprises controllingthe output current using the selected mode of operation.

Current control circuit and a method therefor

The present invention relates to a switched power converter system (), comprising at least a first power converter () and a second power converter (). Each power converter () has a corresponding input terminal () and output terminal (), where each power converter () comprises a corresponding switch arrangement (). The system further comprises a control unit () that at least at start-up is connected to each power converter () in the system () and arranged to control each switch arrangement () by means of spread spectrum modulation, such that cross correlation between the conducted or radiated emissions of the switch arrangements () is avoided.

Coordinated power converter system

A current limiter () comprises a switch () and connection means () to a load and to a DC-voltage source. A control component () measures the current from a load to a DC-voltage source to the switch and controls the switch () to an open position if the current is above a threshold. In the closed position, the switch () admits current from the load to the DC-voltage source. The current limiter also comprises a transmission line () with a first () and a second () end. The first end () is connected to the input port of the switch (), and the second end () is left open or connected to make the transmission line () connected in series with the switch ().

Switch mode current limiter

A radio frequency mixer circuit comprises a first terminal, a local oscillator terminal and a second terminal, a wave propagation medium having a first and second end, a circulator coupling together the first terminal, the first end of the wave propagation medium and the second terminal, a switching means operable according to a signal coupled to the LO terminal, the switching means being coupled to the second end of the wave propagation medium for causing a reflection with unchanged voltage wave polarity when the switching means is in an open state, or a reflection with inverted voltage wave polarity when the switching means is in a closed state, at the second end of the wave propagation medium when a wave is travelling therein.

Switch mode circulator isolated RF mixer

The present invention relates to a solution for electrical power conversion using a first gate () for starting an electrical wave in a wave propagating medium () acting as a transmission delay where an electrical wave propagates and due to reflections in the propagating medium a resulting wave builds up and is transferred to an output for delivering a power amplifier, DC/DC converter or similar function and the output is controlled using a second gate ().

Sub sampling electrical power conversion

The present solution relates operation of a power conversion device (). A first gate () is operated () to provide a voltage pulse () travelling from an input () to a wave propagation medium () through the first gate (). The voltage pulse has duration () less than the propagation time through the medium () to one end of the medium () and back to the input (). The pulse generates a reflected wave. The first gate () is operated () periodically providing a voltage pulse in synchronization with the reflected wave to accumulate the reflected wave travelling in the medium (), performing the accumulation through an accumulation interval (). A second gate () is operated () periodically to provide a discharge pulse () in synchronization with the reflected wave to discharge the wave travelling in the medium (), performing the discharge through a discharge interval ().

Power conversion device using a wave propagation medium and operating method thereof

A system and method for managing processing resources in a communication device having a power unit with distributed processing capability. In one aspect, digital power control processors that are configured to perform power system tasks and signal processing tasks are reconfigured by reallocating the tasks among the processors in order to balance the processing loads.

Distributed power system processing for communication device

A method and an electrical circuit for DC-DC voltage conversion in a network comprising an input voltage terminal, an output voltage terminal, at least one first switch and at least one second switch, at least one input impedance, at least one load impedance and at least one transmission line with known impedance where the electrical circuit is characterized by that the impedance of the at least one transmission line is adapted to be mismatched to at least the load impedance and where at least one of the at least first switches is arranged in relation to the at least one transmission line to switch between open and closed positions for generating a pulse wave propagating in the at least one transmission line charging a load capacitance of the load impedance with electrical energy.

Microwave transmission line DC/DC converter

The invention describes an electric circuit (), a method and a computer program for hot-swapping an electronic board in a telecommunication system, where the increase in current in the electric circuit is controlled by a microcontroller () switching a power transistor in a switching circuit () so as to gradually increase the capacitor voltage for the electronic board. The current level is measured either in the microcontroller () itself or in an external current sense circuit () and compared to a maximum current level.

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Billdal, Sweden

Sverker Sander