Wireless power transmitting and charging system
A wireless power transmitting and charging system is disclosed. A method for operating a power transmitter of the wireless power transmitting and charging system comprises the steps of: maintaining a ping value table where ping signal conditions are mapped according to the height of a power receiver; recognizing the power receiver by varying a ping signal according to the ping signal conditions recorded in the ping value table; and controlling a charging mode according to a message received from the power receiver.
1 . A method for operating a wireless power transmitter, comprising:
maintaining a ping value table having a plurality of ping signal conditions that are mapped to different frequencies of a ping signal;
varying a ping signal condition of the ping signal according to the ping value table;
detecting a power receiver based on the ping signal of a particular ping signal condition from among a plurality of ping signal conditions; and
controlling power transfer based on a charge mode according to a message from the power receiver and an initial driving condition mapped to the particular ping signal condition, the particular ping signal condition having been set based on a previous ping signal condition that was successful in detecting the power receiver.
2 . The method of claim 1 , wherein the ping signal condition includes at least one of a voltage level or a duty ratio of the ping signal.
3 . The method of claim 1 , wherein the detecting the power receiver includes:
storing the previous ping signal condition that was successful in detecting the power receiver; and
setting the previous ping signal condition as an initial value for varying the ping signal.
4 . The method of claim 1 , wherein the controlling the power transfer includes:
determining the particular ping signal condition successful in detecting the power receiver;
determining the initial driving condition mapped to the particular ping signal condition; and
performing the power transfer using the initial driving condition as an initial value of a driving frequency.
5 . The method of claim 1 , wherein the controlling the power transfer includes:
setting the initial driving condition as an initial value of a driving frequency or voltage level; and
varying the driving frequency or voltage level to improve power transmission efficiency.
6 . The method of claim 1 , further comprising receiving the message in response to the ping signal.
7 . The method of claim 1 , wherein the ping signal is a digital ping having a frequency according to one of the plurality of ping signal conditions.
8 . The method of claim 1 , wherein the plurality of ping signal conditions are mapped to different heights of the power receiver.
9 . A power transmitter, comprising:
a coil to transmit a ping signal;
a memory storing a ping value table having a plurality of ping signal conditions that are mapped to different frequencies of a ping signal; and
a controller configured to:
vary a ping signal condition of the ping signal according to the ping value table;
detect a power receiver based on the ping signal of a particular ping signal condition from among the plurality of ping signal conditions; and
control power transfer based on a charge mode according to a message from the power receiver and an initial driving condition mapped to the particular ping signal condition, the particular ping signal condition having been set based on a previous ping signal condition that was successful in detecting the power receiver.
10 . The power transmitter of claim 9 , wherein the controller includes:
a detecting unit; and
a charge mode control unit.
11 . The power transmitter of claim 9 , wherein the ping signal condition includes at least one of a voltage level or a duty ratio of the ping signal.
12 . The power transmitter of claim 9 , wherein the controller is further configured to store:
the previous ping signal condition that was successful in detecting the power receiver; and
set the previous ping signal condition as an initial value for varying the ping signal.
13 . The power transmitter of claim 9 , wherein the controller is further configured to:
determine the particular ping signal condition successful in detecting the power receiver;
determine the initial driving condition mapped to the particular ping signal condition; and
perform the power transfer using the initial driving condition as an initial value of a driving frequency.
14 . The power transmitter of claim 9 , wherein the controller is further configured to:
set the initial driving condition as an initial value of a driving frequency or voltage level; and
vary the driving frequency or voltage level to improve power transmission efficiency.
15 . The power transmitter of claim 9 , wherein the message received from the power receiver is in response to the ping signal.
16 . The power transmitter of claim 9 , wherein the ping signal is a digital ping having a frequency according to one of the plurality of ping signal conditions.
17 . The power transmitter of claim 9 , wherein the plurality of ping signal conditions are mapped to different heights of the power receiver.