COMMUNICATION APPARATUS AND ELECTRONIC DEVICE
First Claim
1. A communication device comprising:
- a communication antenna;
a communication section which is capable of transmitting and receiving a signal via the communication antenna;
a switch formed of a semiconductor switch and connected between the communication antenna and the communication section, wherein the switch electrically connects the communication section with the communication antenna when receiving a connection command signal, and electrically disconnects the communication section from the communication antenna when not receiving the connection command signal;
a switch control section which outputs the connection command signal toward the switch under a specific condition, wherein the switch control section stops the connection command signal when detecting in advance that an overvoltage is to be applied to the communication section; and
a high voltage output part connected between the switch control section and the switch, wherein the high voltage output part converts a voltage of the connection command signal, which is received from the switch control section and is to be output to the switch, into another voltage that keeps the communication section in a signal transmitting state from being electrically disconnected from the communication antenna.
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0 Petitions
Accused Products
Abstract
A communication apparatus includes: a communication antenna, a communication unit which can transmit and receive signals, a switch connected between the communication antenna and the communication unit and composed of a semiconductor switch, a switch control unit, and a high-voltage output means. The switch, when receiving a connection command signal causes the communication unit to be electrically connected with the communication antenna, and when not receiving the signal cuts them off. The switch control unit outputs the signal to the switch under prescribed conditions, and stops the signal when overvoltage applied to the communication unit is detected. The high-voltage output means, connected between the switch control unit and the switch, sets voltage of the signal received from the switch control unit to a voltage at which the communication unit in a transmitting mode would not be cut off from the communication antenna, and outputs the voltage to the switch.
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Citations
26 Claims
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1. A communication device comprising:
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a communication antenna; a communication section which is capable of transmitting and receiving a signal via the communication antenna; a switch formed of a semiconductor switch and connected between the communication antenna and the communication section, wherein the switch electrically connects the communication section with the communication antenna when receiving a connection command signal, and electrically disconnects the communication section from the communication antenna when not receiving the connection command signal; a switch control section which outputs the connection command signal toward the switch under a specific condition, wherein the switch control section stops the connection command signal when detecting in advance that an overvoltage is to be applied to the communication section; and a high voltage output part connected between the switch control section and the switch, wherein the high voltage output part converts a voltage of the connection command signal, which is received from the switch control section and is to be output to the switch, into another voltage that keeps the communication section in a signal transmitting state from being electrically disconnected from the communication antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification