Wireless power transmission system communication protocol
AssigneeLG Electronics Inc.
InventorsSeonghun Lee, Byungsang Jung
Life of this patent
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Abstract
A control method for an inductive power supply (IPS), according to one embodiment of the present invention, can comprise the steps of: applying a ping for sensing an object; measuring a coil current; sensing the object on the basis of the coil current measurement result; transmitting, to the object, the minimum power for waking up a communication unit of the object, wherein the communication unit performs communication by using an out-of band communication protocol; receiving, from the object, pairing information through the out-of band communication protocol so as to perform pairing with the object; and transmitting main power to the paired object.
Claims12
A method for controlling an inductive power supply (IPS), the method comprising:
- applying a ping to detect an object;
- measuring a coil current;
- detecting the object based on a measurement result of the coil current;
- transmitting minimum power for waking up a communication unit of the object to the object, the communication unit performing communication using an out-of-band (OOB) communication protocol;
- receiving pairing information from the object through the OOB communication protocol and performing pairing with the object;
- transmitting main power to the paired object;
- and
- when the performing of the pairing with the object fails, providing a selection interface for receiving a selection input about whether to execute an induction heating mode to heat the object,
- wherein the detecting of the object based on the measurement result of the coil current includes:
- measuring the coil current generated according to application of the ping,
- obtaining an envelope of the measured coil current to determine a reduction rate of the coil current,
- when the reduction rate of the coil current is equal to or greater than a threshold, determining that the object is detected, and
- when the reduction rate of the coil current is smaller than the threshold, determining that the object is removed.
An inductive power supply (IPS) comprising:
- a coil assembly including at least one primary coil generating a magnetic field;
- an inverter converting a direct current (DC) signal into an alternating current (AC) signal;
- a tank circuit providing impedance matching between the inverter and the at least one primary coil;
- a communication unit configured to control communication using an out-of-band (OBB) communication protocol;
- and
- a control unit controlling power transmission,
- wherein the control unit is configured to:
- apply a ping to detect an object and measure a coil current,
- detect the object based on a measurement result of the coil current,
- transmit minimum power for waking up the communication unit of the object to the object,
- receive pairing information from the object through the 00B communication protocol and perform pairing with the object,
- transmit main power to the paired object,
- when performing of the pairing with the object fails, provide a selection interface for receiving a selection input about whether to execute an induction heating mode to heat the object,
- wherein the control unit is further configured to:
- measure the coil current generated according to application of the ping,
- obtain an envelope of the measured coil current to determine a reduction rate of the coil current,
- when the reduction rate of the coil current is equal to or greater than a threshold, determine that the object is detected, and
- when the reduction rate of the coil current is smaller than the threshold, determine that the object is removed.
Dependencies are inferred from the claim text.