Stmicroelectronics S.r.l.

Stmicroelectronics (shenzhen) R&d Co. Ltd.

Huawei Technologies Co., Limited

Xi Yu Xu

Dino Costanzo

Cheng Pan Cai

Peng Dong

Yubin Li

A three-phase load is powered by a PWM (e.g., SVPWM) driven DC-AC inverter having a single shunt-topology. A shunt voltage and a branch voltage of the inverter (across a transistor to be calibrated) are measured during a second period of each SVPWM sector, and the drain-to-source resistance of the calibrated transistor is calculated. During the fourth period of each SVPWM sector, the branch voltage is measured again, and another branch voltage across another transistor is measured. Using the drain-to-source resistance of the calibrated transistor and the voltage across the calibrated transistor measured during the fourth period, the phase current through the calibrated transistor is calculated. Using the other branch voltage measured during the fourth period and the drain-to-source resistance of its corresponding transistor (known from a prior SVPWM sector), the phase current through that transistor is calculated. From the two calculated phase currents, the other phase current can be calculated.

Inverter and method for measuring phase currents in an electric machine

A method for inter-network communication between a first and second user. The method includes receiving a first request for a location associated with the second user from a first switching system for a first network in response to a second request. The method processes information associated with the first request and determines a network identifier for a second network related to the location associated with the second user, and sends the first switching system a location message, including the network identifier for the second network. The method includes receiving a third request for routing information associated with the second user from a second switching system for the second network. The method determines a location directory in the second network for the second user and receives the roaming information for the second user from the location directory. The method then sends the roaming information to the second switching system.

Method and system for inter-network mobile number portability

Growing community of inventors

Shenzhen, China

Xi Yu Xu