Communication apparatus and operation method thereof

Abstract

There is a need to enable communication circuit operation during a period to charge a battery mounted on a communication apparatus according to wireless charging and to be able to prevent a communication circuit from being destroyed during a period to charge a secondary cell. A communication apparatus 1 includes a communication coil 11 , a power receiving portion 12 , a charge control portion 13 , a first switch portion 18 , a second switch portion 15 , a communication circuit 16 , and a processor 17 . A voltage detection circuit 121 of the power receiving portion generates first control signal Cnt 1 of first state H when a terminal voltage of the communication coil exceeds power supply threshold voltage Vth 0 . The first switch portion is controlled to turn on between first terminal T 1 and third terminal T 3 in response to first control signal Cnt 1 . The voltage detection circuit generates second control signal Cnt 2 of third state L when a terminal voltage of the communication coil exceeds charge threshold voltages VthH and VthL during a period to charge the secondary cell 14 . The second switch portion is controlled to turn off in response to second control signal Cnt 2.

1 - 20 . (canceled) 
     
     
         21 . A wireless communication device comprising:
 a matching circuit configured to receive a source power, and configured to transmit and receive a communication signal;   a power receiving circuit configured to rectify the source power, and configured to regulate a charging power and a first supply power based on the source power;   a communication circuit configured to output and input the communication signal via the matching circuit;   a secondary cell configured to receive the charging power and output a second supply power,   a first switching circuit configured to supply the first supply power or the second supply power to the communication circuit based on a voltage level of the source power, and   a second switching circuit configured to decouple the communication circuit from the matching circuit based on the voltage level of the source power.   
     
     
         22 . The wireless communication device according to  claim 21 , further comprising a voltage detecting circuit having a power supply threshold voltage and a charge threshold voltage,
 wherein the power receiving circuit supplies the first supply power to the communication circuit when the voltage level of the power source is higher than the power supply threshold voltage,   wherein the power receiving circuit supplies the second supply power to the communication circuit when the voltage level of the power source is lower than the power supply threshold voltage,   wherein the power receiving circuit decouples the communication circuit with the matching circuit when the voltage level of the power source is higher than the charge threshold voltage.   
     
     
         23 . The wireless communication device according to  claim 22 ,
 wherein the charge threshold voltage is higher than the power supply threshold voltage.   
     
     
         24 . The wireless communication device according to  claim 23 , further comprising:
 an antenna coil coupled to the matching circuit, the antenna coil being configured to receive the source power and to receive and transmit the communication signal.   
     
     
         25 . The wireless communication device according to  claim 24 ,
 wherein the communication circuit is configured to perform communication using NFC.   
     
     
         26 . The wireless communication device according to  claim 25 ,
 wherein the second switching circuit comprises a plurality of enhancement type field-effect transistors.   
     
     
         27 . The wireless communication device according to  claim 25 ,
 wherein the second switching circuit comprises a plurality of PIN diodes.   
     
     
         28 . The wireless communication device according to  claim 25 ,
 wherein the second switching circuit comprises a MEMS switch.