Abstract: A first method (100) of providing a secondary reference for subsequent use in evaluating a power measuring accuracy of a wireless power measurement device (60) under test is presented. An inanimate calibration object (50) is subjected (110) to electromagnetic field variations (38) by controlling operating points of a reference wireless power transmitter device (30). Key power absorption parameters (58) of the calibration object (50) resulting from the electromagnetic field variations (38) are generated (120) and stored (130) together with data (57) that defines the operating points in a data storage (52) being associated (54) with the calibration object (50).

Abstract: A method of controlling and/or evaluating the temperature of a wireless power coil (105; 205; 305) in coil unit (100; 200; 300) is provided. The method comprises providing a coil unit (100; 200; 300) comprising a wireless power coil (105; 205; 305) comprising at least two strands (112, 114; 212, 214; 312, 314), wherein at least one strand (114; 214; 314) is used for heating and at least one strand (112; 212; 312) is used for wireless power transfer, and applying a current to the least one strand (114; 214; 314) used for heating. The coil unit (100; 200; 300) is in operative communication with a processing means (18, 28, 90) configured to provide a current to the at least one strand (114; 214; 314) used for heating.

Abstract: Disclosed is a method (310) for providing operational feedback during power transfer in a wireless power transfer system. The wireless power transfer system comprises a power transmit device arranged to transfer power over an inductive wireless power transfer interface operating at a transmit frequency to a power receive device. The wireless power transfer system is adapted to transfer information at half duplex using Frequency Shift Keying, FSK, in one direction and Amplitude Shift Keying, ASK, in the other direction. The method comprises transferring (308), at the transmit frequency by the power transmit device, power to the power receive device. During the transferring (308), the method further comprises transmitting (311), at the transmit frequency by one of the power transmit device or the power receive device, a first data packet to the other of the power transmit device or the power receive device using one of two modulation types being FSK or ASK.

Abstract: A system (100) for testing of wireless power equipment in the form of a wireless power transmitter device and a wireless power receiver device is disclosed. The system (100) has a probe device (110) and an analyzer device (130). The probe device (110) has at least one pickup coil (112), the pickup coil being adapted to be placed between a surface of a housing of the wireless power transmitter device and a surface of a housing of the wireless power receiver device to generate electric signals by capturing electromagnetic signals exchanged between the wireless power transmitter and receiver devices pursuant to a wireless power transfer protocol. The probe device (110) also has an interface (114) for providing the electric signals generated by the pickup coil (112) to the analyzer device (130). The analyzer device (130) has an interface (132) for receiving the electric signals from the probe device (110).

Abstract: A first method (100) of providing a secondary reference for subsequent use in evaluating a power measuring accuracy of a wireless power measurement device (60) under test is presented. An inanimate calibration object (50) is subjected (110) to electromagnetic field variations (38) by controlling operating points of a reference wireless power transmitter device (30). Key power absorption parameters (58) of the calibration object (50) resulting from the electromagnetic field variations (38) are generated (120) and stored (130) together with data (57) that defines the operating points in a data storage (52) being associated (54) with the calibration object (50).

Abstract: A foreign object emulation device (60; 160; 260) for testing foreign object detection of a wireless power device (10; 20) is provided. The foreign object emulation device (60; 160; 260) is in operative communication with a processing means (61; 42; 52). The foreign object emulation device (60; 160; 260) comprises a main body (68; 168; 268) being arranged with at least one emulated object (66; 166a-b; 266), a sensor unit (64) comprising at least one temperature sensor (64a) configured to transmit temperature data to the processing means (61; 42; 52), wherein the temperature data is indicative of the temperature of the at least one emulated object (66; 166a-b; 266), and means for causing a controlled relative movement between the at least one emulated object (66; 166a, 166b) and the wireless power device (10; 20) being tested.

Abstract: A method (200) is disclosed for testing of wireless power transfer equipment (20) that has a plurality of wireless power transmitters (22a-n) adapted for concurrent wireless power transfer to respective wireless power receiver devices (10a, 10a?, 10d). The method comprises providing (210) a number of slave test devices (30a-n), and providing (220) a master test device (40) in communicative connection with the slave test devices (30a-n). The method further comprises arranging (230) each slave test device (30a-n) in a position suitable for receiving power from a respective one of the wireless power transmitters (22a-n) of the wireless power transfer equipment (20) under test, and commanding (240; 110a-n), by the master test device (40), the slave test devices (30a-n) to perform respective test procedures (120a-n) upon the respective wireless power transmitters (22a-n) while being in concurrent operation.

Abstract: A method (200) is disclosed for testing of wireless power transfer equipment (20) that has a plurality of wireless power transmitters (22a-n) adapted for concurrent wireless power transfer to respective wireless power receiver devices (10a, 10a?, 10d). The method comprises providing (210) a number of slave test devices (30a-n), and providing (220) a master test device (40) in communicative connection with the slave test devices (30a-n). The method further comprises arranging (230) each slave test device (30a-n) in a position suitable for receiving power from a respective one of the wireless power transmitters (22a-n) of the wireless power transfer equipment (20) under test, and commanding (240; 110a-n), by the master test device (40), the slave test devices (30a-n) to perform respective test procedures (120a-n) upon the respective wireless power transmitters (22a-n) while being in concurrent operation.

Abstract: Disclosed is a method for transferring data during power transfer in a wireless power transfer system (100). The wireless power transfer system (100) comprises a power transmit device (120) arranged to transfer power over an inductive wireless power transfer interface (105) operating at a transmit frequency to a power receive device (110). The wireless power transfer system (100) is adapted to transfer information at half duplex using Frequency Shift Keying, FSK, in one direction and Amplitude Shift Keying, ASK, in the other direction. The method comprises transferring, at the transmit frequency by the power transmit device (120), power to the power receive device (110) and, during the transferring transmitting, at the transmit frequency by one of the power transmit device (120) or the power receive device (110) a first data packet to the other of the power transmit device (120) or the power receive device (110) using one of two modulation types being FSK or ASK.

Abstract: Disclosed is a method (310) for providing operational feedback during power transfer in a wireless power transfer system. The wireless power transfer system comprises a power transmit device arranged to transfer power over an inductive wireless power transfer interface operating at a transmit frequency to a power receive device. The wireless power transfer system is adapted to transfer information at half duplex using Frequency Shift Keying, FSK, in one direction and Amplitude Shift Keying, ASK, in the other direction. The method comprises transferring (308), at the transmit frequency by the power transmit device, power to the power receive device. During the transferring (308), the method further comprises transmitting (311), at the transmit frequency by one of the power transmit device or the power receive device, a first data packet to the other of the power transmit device or the power receive device using one of two modulation types being FSK or ASK.

Abstract: An apparatus and a method for determining a power value of a target in the form of an AC circuit (130; 230; 330) having an AC power source (132; 232; 332). The method involves operating (72) a controllable DC power source (12) to provide DC power to a DC circuit (10; 110; 210; 310) and measuring (73) at least one thermal parameter related to power dissipation of the DC circuit (10; 110; 210; 310) and of the target AC circuit (30; 130; 230; 330), wherein at least one heat sink (160a, 160b; 260; 360) is thermally coupled between the DC circuit (10; 110; 210; 310) and the target AC circuit (30; 130; 230; 330). The method further involves controlling (74) the DC power source (12) based on the measured at least one thermal parameter to reduce a difference in power dissipation between the DC circuit (10; 110; 210; 310) and the target AC circuit (30; 130; 230; 330).

Abstract: A testing system (90) for use in testing of wireless power transfer is disclosed. The testing system has at least one wireless power receiver circuit (34) for receiving inductive power from an external wireless power transmitter (20). The testing system is arranged to detect received inductive power at least two operating frequencies relating two both a wireless power standard and a wireless communication standard. Measurements data originating from inductive power received adopting the wireless communication standard is forwarded to a processing means (42) which based on reference data is arranged to detect whether a communication receiver circuit (15) and arranged to communicate according to the wireless communication standard adopting the second frequency range, when arranged in operative proximity to the external wireless power transmitter device (20), would be negatively affected by the inductive power transmitted from the external wireless power transmitter device (20).

Abstract: A testing device for testing a wireless power transmitter device having at least one transmitter coil comprises at least one wireless power receiver coil and is in operative communication with a processing means with associated memory. The testing device is configured to receive a power signal applied by the wireless power transmitter device, transmit a first packet, being a signal strength packet, to the wireless power transmitter device in response to receiving said power signal, and transmit a second packet to the wireless power transmitter device if the wireless power transmitter device continues to transmit the power signal to the testing device in response to receiving the signal strength packet. The processing means stores the signal strength packet or signal strength value(s) thereof in the memory when the second packet is completely transmitted and, if not completely transmitted, disregards the signal strength packet or signal strength value(s).

Abstract: A system (100) for testing of wireless power equipment in the form of a wireless power transmitter device and a wireless power receiver device is disclosed. The system (100) has a probe device (110) and an analyzer device (130). The probe device (110) has at least one pickup coil (112), the pickup coil being adapted to be placed between a surface of a housing of the wireless power transmitter device and a surface of a housing of the wireless power receiver device to generate electric signals by capturing electromagnetic signals exchanged between the wireless power transmitter and receiver devices pursuant to a wireless power transfer protocol. The probe device (110) also has an interface (114) for providing the electric signals generated by the pickup coil (112) to the analyzer device (130). The analyzer device (130) has an interface (132) for receiving the electric signals from the probe device (110).

Abstract: A testing system (90) for use in testing of wireless power transfer is disclosed. The testing system has at least one wireless power receiver circuit (34) for receiving inductive power from an external wireless power transmitter (20). The testing system is arranged to detect received inductive power at least two operating frequencies relating two both a wireless power standard and a wireless communication standard. Measurements data originating from inductive power received adopting the wireless communication standard is forwarded to a processing means (42) which based on reference data is arranged to detect whether a communication receiver circuit (15) and arranged to communicate according to the wireless communication standard adopting the second frequency range, when arranged in operative proximity to the external wireless power transmitter device (20), would be negatively affected by the inductive power transmitted from the external wireless power transmitter device (20).

Abstract: A testing device (30; 50) for testing a wireless power transmitter device (20) having at least one transmitter coil (24), wherein the testing device (30; 50) comprises at least one wireless power receiver coil (34) and wherein the testing device (30; 50) is in operative communication with a processing means (42; 52) and its associated memory (44; 54). The testing device (30; 50) is configured to receive a power signal applied by the wireless power transmitter device (20), transmit a first packet, being a signal strength packet, to the wireless power transmitter device (20) in response to receiving said power signal and transmit a second packet to the wireless power transmitter device (20) if the wireless power transmitter device (20) continues to transmit the power signal to the testing device (30; 50) n response to receiving the signal strength packet.

Abstract: An apparatus and a method for determining a power value of a target in the form of an AC circuit (130; 230; 330) having an AC power source (132; 232; 332). The method involves operating (72) a controllable DC power source (12) to provide DC power to a DC circuit (10; 110; 210; 310) and measuring (73) at least one thermal parameter related to power dissipation of the DC circuit (10; 110; 210; 310) and of the target AC circuit (30; 130; 230; 330), wherein at least one heat sink (160a, 160b; 260; 360) is thermally coupled between the DC circuit (10; 110; 210; 310) and the target AC circuit (30; 130; 230; 330). The method further involves controlling (74) the DC power source (12) based on the measured at least one thermal parameter to reduce a difference in power dissipation between the DC circuit (10; 110; 210; 310) and the target AC circuit (30; 130; 230; 330).