Device housing a battery and charging pad

Abstract

A device housing a battery ( 50 ) includes a receiving coil ( 51 ), and a charging pad ( 10 ) includes a transmitting coil ( 11 ) that magnetically couples with, and supplies charging power to the receiving coil. The device further includes a modulator circuit ( 61 ) that changes the impedance of the receiving coil according to internal battery data. The charging pad further includes a detection circuit ( 17 ) that detects receiving coil impedance changes to detect the battery data. The modulator circuit has a load circuit ( 62 ) connected in parallel with the receiving coil and has a series-connected switching device ( 64 ) and impedance modulating capacitor ( 63 ), and a control circuit ( 65 ) that switches the load circuit switching device ON and OFF according to the battery data. The modulator circuit switches the switching device ( 64 ) ON and OFF to transmit battery data to the charging pad.

What is claimed is: 
     
         1 . A battery housing device comprising:
 an internal battery housed in the battery housing device; and   a receiving coil that supplies charging power to the internal battery by magnetically coupling with a transmitting coil of a charging pad,   wherein the battery housing device further comprises a modulator circuit that modulates an impedance of the receiving coil with a digital signal,   wherein the modulator circuit comprises:
 a load circuit connected in parallel with the receiving coil, the load circuit having a switching device connected in series with an impedance modulating capacitor; and 
 a control circuit that switches the switching device of the load circuit ON and OFF in accordance with the digital signal. 
   
     
     
         2 . The battery housing device as cited in  claim 1 , wherein the load circuit further comprises a pair of series-connected switching devices, and an impedance modulating capacitor connected in series with each of the switching devices;
 wherein a connection node between the pair of switching devices is connected to a ground line, and the pair of switching devices is simultaneously controlled ON and OFF by the control circuit.   
     
     
         3 . The battery housing device as cited in  claim 1 , wherein the digital signal that the battery housing device transmits to the charging pad is related to battery information of the internal battery. 
     
     
         4 . The battery housing device as cited in  claim 3 , wherein the battery information of the internal battery comprises at least one battery information elected from battery voltage during charging, battery charging current, battery temperature, a serial number of the battery, allowable charging current that sets the charging current for the battery, allowable battery temperature that controls battery charging, remaining capacity and full-charge of the battery. 
     
     
         5 . The battery housing device as cited in  claim 1 , wherein the battery housing device is a battery pack or a mobile telephone. 
     
     
         6 . A circuit of a battery housing device comprising:
 a modulator circuit that modulates an impedance of a receiving coil of the battery housing device with a digital signal, the receiving coil supplying charging power to an internal battery of the battery housing device by magnetically coupling with a transmitting coil of a charging pad,   wherein the modulator circuit comprises:
 a load circuit connected in parallel with the receiving coil, the load circuit having a switching device connected in series with an impedance modulating capacitor; and 
 a control circuit that switches the switching device of the load circuit ON and OFF in accordance with the digital signal. 
   
     
     
         7 . The circuit as cited in  claim 6 , further comprising a receiving coil that supplies charging power to an internal battery of the battery housing device by magnetically coupling with a transmitting coil of a charging pad. 
     
     
         8 . The circuit as cited in  claim 6 , wherein the load circuit further comprises a pair of series-connected switching devices, and an impedance modulating capacitor connected in series with each of the switching devices;
 wherein a connection node between the pair of switching devices is connected to a ground line, and the pair of switching devices is simultaneously controlled ON and OFF by the control circuit.   
     
     
         9 . The circuit as cited in  claim 6 , wherein the digital signal is related to battery information of the internal battery. 
     
     
         10 . The circuit as cited in  claim 9 , wherein the battery information of the internal battery comprises at least one battery information elected from battery voltage during charging, battery charging current, battery temperature, a serial number of the battery, allowable charging current that sets the charging current for the battery, allowable battery temperature that controls battery charging, remaining capacity and full-charge of the battery. 
     
     
         11 . A circuit of a battery housing device comprising:
 a control circuit that controls a modulator circuit to modulate an impedance of a receiving coil of the battery housing device with digital signal, the receiving coil supplying charging power to an internal battery of the battery housing device by magnetically coupling with a transmitting coil of a charging pad,   wherein the control circuit switches a switching device of a load circuit ON and OFF in accordance with the digital signal, the load circuit being connected in parallel with the receiving coil, and the switching device of the load circuit being connected in series with an impedance modulating capacitor.   
     
     
         12 . The circuit as cited in  claim 11 ,
 wherein the load circuit comprises a pair of series-connected switching devices, and an impedance modulating capacitor connected in series with each switching device,   wherein the connection node between the pair of switching devices is connected to the ground line, and   wherein the pair of switching devices is simultaneously controlled ON and OFF by the control circuit.   
     
     
         13 . The circuit as cited in  claim 11 , wherein the digital signal is related to battery information of the internal battery. 
     
     
         14 . The circuit as cited in  claim 13 , wherein the battery information of the internal battery comprises at least one battery information elected from battery voltage during charging, battery charging current, battery temperature, a serial number of the battery, allowable charging current that sets the charging current for the battery, allowable battery temperature that controls battery charging, remaining capacity and full-charge of the battery. 
     
     
         15 . The battery housing device as cited in  claim 3 , wherein the battery housing device further comprises a battery data detection circuit that detects the battery information of the internal battery, the battery data detection circuit being connected between the internal battery and the modulator circuit.