JP2836344B2 - Transmitter / receiver for wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system including a master station and a slave station, and more particularly to a transmission / reception apparatus for a slave station using a solar battery.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing an example of a transmitting / receiving device of a slave station in a conventional radio communication system. As shown in the figure, the slave station transmission / reception device using a solar panel as a power source temporarily charges the battery 109 with the power generated by the solar panel 108 and supplies the power to each circuit. The slave station communicates with the master station using the power from the battery 109. That is, the reception radio frequency signal 11 transmitted from the master station is received by the radio reception circuit 101, and the reception signal 21 obtained from the radio reception circuit 101 is received.
Is converted into reception data 31 by the reception signal processing circuit 102. The received data 31 is transmitted to each terminal via the terminal interface circuit 103. The data transmitted from each terminal is collected by the terminal interface circuit 103 and becomes transmission data 41. Transmission data 41
Is converted into a processing signal 51 by the transmission signal processing circuit 104, and the processing signal 51 is transmitted to the master station as a transmission radio frequency signal 61 by the radio transmission circuit 105.

[0003]

In the transmitting / receiving apparatus of the above-mentioned slave station using a conventional solar battery as a power source, the power supplied from the battery 109 drops sharply due to factors such as weather conditions and line usage. It is impossible to operate the transmitting / receiving device of the station, and a failure such as line disconnection or system stoppage may occur. In addition, there is a problem that a failure such as a stop of the system occurs until maintenance such as battery replacement performed when the supplied power is reduced is completed. An object of the present invention is to provide a transmission / reception device that prevents system stoppage due to a decrease in power of a solar battery.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a power supply power drop detecting circuit for detecting a power drop of a solar battery and a power supply transmitted from the power supply power drop detecting circuit are provided to a transmitting / receiving apparatus of a slave station powered by a solar battery. A transmission / reception control circuit for controlling the number of transmissions / receptions of the slave station according to a signal. For example, the slave station has a terminal interface circuit for controlling transmission and reception between the master station and the terminal, and a power supply power decrease detection circuit detects a decrease in the supply power of the solar battery, and issues a signal based on the detection signal. The incoming control circuit outputs a control signal,
The terminal interface circuit is configured to limit the number of transmissions and receptions based on the control signal.

[0005]

When the supply power of the solar battery is reduced, the number of incoming and outgoing calls of the slave station is limited, thereby suppressing the power consumption in the slave station and preventing a sharp decrease in the supply power. Avoid disconnection between the two.

[0006]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a transmitting / receiving apparatus for a slave station according to the present invention. In the figure, the slave station transmission / reception apparatus temporarily charges the power generated by the solar panel 108 to the battery 109, further supplies power to each circuit, and communicates with the master station using the power from the battery 109. I do. Radio reception circuit 101 receives radio frequency signal 11 for reception received from the master station, and reception signal processing circuit 102 converts reception signal 21 into reception data 31. The terminal interface circuit 103 sends the received data 31 to each terminal. Further, the terminal interface circuit 103 collects data from each terminal and sets it as transmission data 41. The transmission signal processing circuit 104 converts the transmission data 41 into a processing signal 51, and the wireless transmission circuit 105 transmits the processing signal 51 to the master station as a transmission radio frequency signal 61.

Further, when the power supplied from the battery 109 falls below a predetermined reference value, the power supply drop detection circuit 106 outputs a power drop detection signal 71 corresponding to the degree. The transmission / reception control circuit 107 outputs a transmission / reception control signal 81 corresponding to the power drop detection signal 71 to the terminal interface circuit 103.

According to this configuration, when the power supplied from the battery 109 falls below a predetermined reference value, the power-supply-power-down detection circuit 106 sends and receives a power-down detection signal 71 according to the degree. Output to the control circuit 107. The transmission / reception control circuit 107 outputs a transmission / reception control signal 81 corresponding to the power drop detection signal 71 to the terminal interface circuit 103. When the terminal interface circuit 103 receives the transmission / reception control signal 81,
The number of incoming and outgoing calls for each connected terminal is variably limited.

Therefore, when the power supplied from the battery 109 is reduced, the number of incoming / outgoing calls is limited to prevent an excessive drop, and the line currently being communicated is cut off or the system is stopped. Work around. Further, the power consumption of the transmission / reception operation in the slave station is suppressed, and until the battery replacement or the like is completed, the connection is ensured even in a state where the number of lines is reduced, and the line is prevented from being completely disconnected.

[0010]

As described above, according to the present invention, in a transmitting / receiving apparatus using a solar battery, a power supply power drop detecting circuit for detecting a drop in the power supplied to the battery, and the number of incoming / outgoing calls of the slave station based on the detection result. The circuit has a call control circuit that outputs a signal to limit the number of calls, so that when the power supply of the battery is reduced, the number of calls is variably limited. And the like, and it is possible to avoid a failure such as a system stoppage for a long time until maintenance such as battery replacement is completed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a transmission / reception device of the present invention.

FIG. 2 is a block diagram of an example of a conventional transmitting / receiving apparatus.

[Explanation of symbols]

 Reference Signs List 101 wireless receiving circuit 103 terminal interface circuit 105 wireless transmitting circuit 108 solar panel 109 battery

Claims (2)

(57) [Claims] 1. A power transmitting / receiving apparatus for a slave station using a solar battery as a power source in a wireless communication system including a master station and a slave station, comprising: a power drop detecting circuit for detecting a drop in power of the solar battery; A transmission / reception device for a wireless communication system, comprising: a transmission / reception control circuit for controlling the number of transmission / reception of a slave station based on a signal transmitted from a power drop detection circuit. And a terminal interface circuit for controlling transmission and reception between the master station and the terminal, wherein a power supply power decrease detection circuit detects a decrease in the supply power of the solar battery, and the transmission / reception control is performed based on the detection signal. The circuit outputs a control signal,
2. The transmitting / receiving device of a wireless communication system according to claim 1, wherein the terminal interface circuit limits the number of transmission / reception based on the control signal.