Non-contact power charging system and control method thereof

Abstract

A non-contact power charging, in which power transmission can be interrupted when foreign materials are deposited on a charge plate of the non-contact power charging system. A charging operation can be continuously maintained at a stable voltage even if a non-contact power receiving apparatus moves by touching or displacement on the charge plate of the non-contact power charging system in the charging operation. Charging efficiency is improved.

What is claimed is: 
     
       1. An apparatus for A device configured to wirelessly receiving receive power from a wireless power transmission apparatus, the device comprising:
 a charge core configured to generate an induced current in response to an electromotive force exerted by a the wireless power transmission apparatus; 
 a rectifier connected to the charge core to rectify the induced current and configured to generate a power signal; 
 a charge circuit configured to receive the power signal and charge a battery cell with the power signal; 
 a power monitoring module for monitoring configured to monitor a voltage level of the power signal and determine by determining whether the voltage level is between a lower limit and an upper limit of a predetermined reference range; and 
 a device controller configured to generate a voltage adjustment signal for requesting to request the transmission apparatus to increase a level of the electromotive force when the voltage level is lower than the lower limit of the predetermined reference range and to decrease the level of the electromotive force when the voltage level is higher than the upper limit of the predetermined reference range, 
 wherein the device controller is configured to transmit the voltage adjustment signal to the transmission apparatus. 
 
     
     
       2. The apparatus according to  claim 1 , wherein the power monitoring module comprises:
 a low voltage monitor module configured to determine whether the voltage level of the power signal is lower than the lower limit of the predetermined reference range; and 
 a high voltage monitor module configured to determine whether the voltage level of the power signal is higher than the upper limit of the predetermined reference range. 
 
     
     
       3. The apparatus according to  claim 1 , wherein, when the voltage level of the power signal is lower than the lower limit of the predetermined reference range, the voltage adjustment signal generated by the device controller comprises:
 a power-up signal for requesting to indicate to the transmission apparatus to increase the level of the electromotive force when the voltage level of the power signal is lower than the lower limit of the predetermined reference range to be increased; and 
 wherein, when the voltage level of the power signal is higher than an upper limit of the predetermined reference range, the voltage adjustment signal generated by the device controller comprises: 
 a power-down signal for requesting to indicate to the transmission apparatus to decrease the level of the electromotive force when the voltage level of the power signal is higher than the upper limit of the predetermined reference range to be decreased. 
 
     
     
       4. The apparatus according to  claim 1 , wherein the charge core transmits the voltage adjustment signal through load modulation. 
     
     
       5. The apparatus according to  claim 1 , wherein the device controller is configured to generate a normal reception signal when the voltage level of the power signal is between the lower limit and the upper limit of the predetermined reference range. 
     
     
       6. A method of charging an apparatus, comprising:
 generating an induced current in a charge core in response to an electromotive force exerted by a wireless power transmission apparatus; 
 rectifying the induced current to generate a power signal for charging a battery cell; 
 monitoring a voltage level of the power signal and determining whether the voltage level is between a lower limit and an upper limit of a predetermined reference range; 
 generating a voltage adjustment signal for requesting the transmission apparatus to increase a level of the electromotive force when the voltage level is lower than the lower limit of the predetermined reference range and to decrease the level of the electromotive force when the voltage level is higher than the upper limit of the predetermined reference range; and 
 transmitting the voltage adjustment signal to the transmission apparatus. 
 
     
     
       7. The method of  claim 6 , wherein the voltage adjustment signal is transmitted to the transmission apparatus through load modulation. 
     
     
       8. The method of  claim 6 , further comprising generating a normal reception signal when the voltage level of the power signal is between the lower limit and the upper limit of the predetermined reference range. 
     
     
       9. An apparatus for A device configured to wirelessly receiving receive power from a wireless power transmission apparatus, the device comprising:
 a charge core configured to generate an induced current in response to an electromotive force exerted by a the wireless power transmission apparatus; 
 a rectifier connected to the charge core to rectify the induced current and configured to generate a power signal; 
 a charge circuit configured to receive the power signal and charge a battery cell with the power signal; 
 a power monitoring module for monitoring configured to monitor a voltage level of the power signal and determine by determining whether the voltage level is within a predetermined reference range; and 
 a device controller configured to generate a voltage adjustment signal for requesting to request the transmission apparatus to change a characteristic of the electromotive force when the voltage level of the power signal falls outside of the predetermined reference range, 
 wherein, when the voltage level of the power signal is lower than a lower limit of the predetermined reference range, the voltage adjustment signal generated by the device controller comprises:
 a power-up signal for requesting to indicate to the transmission apparatus to increase a level of the electromotive force when the voltage level of the power signal is lower than a lower limit of the predetermined reference range to be increase; and 
 wherein, when the voltage level of the power signal is higher than an upper limit of the predetermined reference range, the voltage adjustment signal generated by the device controller comprises: 
 a power-down signal for requesting to indicate to the transmission apparatus to decrease the a level of the electromotive force when the voltage level of the power signal is higher than an upper limit of the predetermined reference range to be decreased. 
 
 
     
     
       10. The apparatus according to  claim 9 , wherein the power monitoring module comprises:
 a low voltage monitor module configured to determine whether the voltage level of the power signal is lower than the lower limit of the predetermined reference range; and 
 a high voltage monitor module configured to determine whether the voltage level of the power signal is higher than the upper limit of the predetermined reference range. 
 
     
     
       11. The apparatus according to  claim 9 , wherein the device controller transmits the voltage adjustment signal to the transmission apparatus through the charge core. 
     
     
       12. The apparatus according to  claim 9 , wherein the device controller transmits the voltage adjustment signal to the transmission apparatus through load modulation. 
     
     
       13. The apparatus according to  claim 9 , wherein the device controller is configured to generate a normal reception signal when the voltage level of the power signal is within the predetermined reference range. 
     
     
       14. The apparatus according to  claim 9 , wherein the characteristic of the electromotive force comprises a frequency of a transmission power signal generated by the transmission apparatus for generating the electromotive force. 
     
     
       15. A method of charging an apparatus, comprising:
 generating an induced current in a charge core in response to an electromotive force exerted by a wireless power transmission apparatus; 
 rectifying the induced current to generate a power signal for charging a battery cell; 
 monitoring a voltage level of the power signal and determining whether the voltage level is within a predetermined reference range; 
 generating a voltage adjustment signal for requesting the transmission apparatus to change a characteristic of the electromotive force when the voltage level of the power signal falls outside of the predetermined reference range; and 
 transmitting the voltage adjustment signal to the transmission apparatus, 
 wherein, when the voltage level of the power signal is lower than a lower limit of the predetermined reference range, the voltage adjustment signal comprises:
 a power-up signal for requesting indicating to the transmission apparatus to increase a level of the electromotive force when the voltage level of the power signal is lower than a lower limit of the predetermined reference range to be increased; and 
 wherein, when the voltage level of the power signal is higher than an upper limit of the predetermined reference range, the voltage adjustment signal comprises: 
 a power-down signal for requesting indicating to the transmission apparatus to decrease the level of the electromotive force when the voltage level of the power signal is higher than an upper limit of the predetermined reference range to be decreased. 
 
 
     
     
       16. The method of  claim 15 , wherein determining whether the voltage level is within the predetermined reference range comprises:
 determining whether the voltage level of the power signal is lower than the lower limit of the predetermined reference range; and 
 determining whether the voltage level of the power signal is higher than an upper limit of the predetermined reference range. 
 
     
     
       17. The method of  claim 15 , wherein the voltage adjustment signal is transmitted to the transmission apparatus through the charge core. 
     
     
       18. The method of  claim 15 , wherein the voltage adjustment signal is transmitted to the transmission apparatus through load modulation. 
     
     
       19. The method of  claim 15 , further comprising generating a normal reception signal when the voltage level of the power signal is within the predetermined reference range. 
     
     
       20. The method of  claim 15 , wherein the characteristic of the electromotive force comprises a frequency of a transmission power signal generated by the transmission apparatus for generating the electromotive force. 
     
     
       21. A device configured to wirelessly receive power from a wireless power transmission apparatus, the device comprising:
 a charge core configured to an induced current in response to an electromotive force exerted by the wireless power transmission apparatus;   a rectifier connected to the charge core and configured to generate a power signal by rectifying the induced current;   a power monitoring module to monitor a voltage level of the power signal by determining whether the voltage level is between a lower limit and an upper limit of a predetermined reference range; and   a device controller to generate a voltage adjustment signal to request the wireless power transmission apparatus to increase a level of the electromotive force when the voltage level is lower than the lower limit of the predetermined reference range and to decrease the level of the electromotive force when the voltage level is higher than the upper limit of the predetermined reference range;   wherein the device controller is to transmit the voltage adjustment signal to the wireless power transmission apparatus.   
     
     
       22. A device configured to wirelessly receive power from a wireless power transmission apparatus, the device comprising:
 a charge core to receive an ID call signal from the wireless power transmission apparatus, transmit a unique ID to the wireless power transmission apparatus, and generate an induced current in response to an electromotive force exerted by the wireless power transmission apparatus;   a device controller to generate information on the unique ID in response to the ID call signal;   a rectifier connected to the charge core and configured to generate a received power signal by rectifying the induced current;   a power monitoring module to monitor a voltage level of the power signal by determining whether the voltage level is different from a predetermined reference voltage, wherein the device controller is configured to use load modulation to transmit an adjustment signal to the wireless power transmission apparatus to change a characteristic of the electromotive force, and   wherein, if the voltage level of the received power signal is lower than the predetermined reference voltage, the adjustment signal to be generated by the device controller comprises:   a power-up signal to indicate a level of the electromotive force to be increased;   wherein, if the voltage level of the received power signal is equal to the predetermined reference voltage, the adjustment signal to be generated by the device controller comprises:   a normal reception signal which indicates normal reception; and   wherein, if the voltage level of the received power signal is higher than the predetermined reference voltage, the adjustment signal to be generated by the device controller comprises:   a power-down signal to indicate a level of the electromotive force to be decreased.   
     
     
       23. The apparatus of claim 22, wherein the characteristic of the electromotive force includes a frequency of the electromotive force, and
 wherein the frequency is to decrease if the adjustment signal includes the power-up signal, or the frequency is to increase if the adjustment signal includes the power-down signal.   
     
     
       24. A method of charging an apparatus, comprising:
 receiving an ID call signal through a charge core from a wireless power transmission apparatus;   generating information on a unique ID in response to the ID call signal;   transmitting the unique ID through the charge core to the wireless power transmission apparatus;   generating an induced current in the charge core in response to an electromotive force exerted by the wireless power transmission apparatus;   rectifying the induced current to generate a received power signal;   monitoring a voltage level of the received power signal and determining whether the voltage level is different from a predetermined reference voltage;   generating an adjustment signal regarding whether to change or not a characteristic of the electromotive force by using a load modulation; and   transmitting the adjustment signal through the charge core to the wireless power transmission apparatus,   wherein, when the voltage level of the received power signal is lower than the predetermined reference voltage, the adjustment signal comprises:   a power-up signal which indicates a level of the electromotive force to be increased;   wherein, when the voltage level of the received power signal is equal to the predetermined reference voltage, the adjustment signal comprises:   a normal reception signal which indicates normal reception; and   wherein, when the voltage level of the received power signal is higher than the predetermined reference voltage, the adjustment signal comprises:   a power-down signal which indicates a level of the electromotive force to be decreased.   
     
     
       25. The method of claim 24, wherein the characteristic of the electromotive force includes a frequency of the electromotive force, and
 wherein the frequency is to decrease if the adjustment signal includes the power-up signal, or the frequency is to increase if the adjustment signal includes the power-down signal.