Patent ID: 9160196
Filing Date: 2015-10-13
Classification: H02J,H04B

Abstract:
1. A communication apparatus comprising: a communication coil; a power receiving portion; a charge control portion; a first switch portion; a second switch portion; a communication circuit; and a processor, wherein the communication coil receives a transmission signal transmitted from another communication apparatus; wherein the power receiving portion generates a power-supply voltage from the transmission signal received by the communication coil; wherein the charge control portion is connectable to a secondary cell; wherein the charge control portion is capable of charging the secondary cell using the power-supply voltage; wherein the communication coil is coupled to a transmission/reception terminal of the communication circuit via the second switch portion; wherein the processor is coupled to the communication circuit; wherein a first terminal of the first switch portion is supplied with the power-supply voltage; wherein a second terminal of the first switch portion is capable of being supplied with battery voltage; wherein a third terminal of the first switch portion couples with the communication circuit; wherein the power receiving portion includes a voltage detection circuit responding to terminal voltage of the communication coil; wherein the voltage detection circuit generates a first control signal of a first state when the terminal voltage of the communication coil exceeds a specified power supply threshold voltage; wherein the first switch portion is controlled to turn on between the first terminal and the third terminal in response to the first control signal of the first state; wherein the voltage detection circuit generates the first control signal of a second state different from the first state when the terminal voltage of the communication coil does not exceed the specified power supply threshold voltage; wherein the first switch portion is controlled to turn on between the second terminal and the third terminal in response to the first control signal of the second state; wherein the voltage detection circuit generates the second control signal of a third state during a period to charge the secondary cell when the terminal voltage of the communication coil exceeds a charge threshold voltage higher than the specified power supply threshold voltage; wherein the second switch portion is controlled to turn off in response to the second control signal of the third state; wherein the voltage detection circuit generates the second control signal of a fourth state different from the third state when the terminal voltage of the communication coil does not exceed the charge threshold voltage higher than the specified power supply threshold voltage; wherein the second switch portion is controlled to turn on in response to the second control signal of the fourth state; and wherein the communication circuit is capable of communicating with the other communication apparatus during a period in which the second switch portion is controlled to turn on.