JPS6335031A - Two-way communication equipment - Google Patents

Abstract

PURPOSE:To reduce the power consumption remarkably in comparison with an equipment supplying power at all times by inserting a switch closed by an outputted electromotive force of a photovolatic element of a reception section between a power supply section and an emitting section. CONSTITUTION:A normally-off type analog switch 11 is inserted between a power supply 9 and an emitting section including a sensor 2 and a signal processing section. After the sending of a data 202, a microcomputer 4 makes the analog switch 11 nonconductive via a power control section 13 to interrupt its own power supply. The power is supplied to the emitting section including the sensor 2 and the signal processing section as required only in this way. Thus, in comparison with the case with supplying power at all times, the power consumption is reduced remarkably.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides: - A phase-directional system that includes a receiving section having a photovoltaic element and a transmitting section having a light emitting element, and transmits and receives signals via an optical transmission line. Regarding optical communication equipment.

[Conventional technology]

FIG. 3 shows the configuration of a conventionally used optical communication device of this type. In this embodiment, for example, in a chemical plant, output values of sensors 2 such as semiconductor pressure transducers, flow meters, thermocouples, etc. are transmitted in response to commands from a remote control room that is connected via optical fibers IA and IBt. 6.6 is used for this purpose, 3 is an A/D converter that converts the output electrical signal of sensor 2 into a digital signal, and 4 is a microcomputer.
An optical signal inputted through the optical fiber 1At- is converted into an electrical signal by the photodiode 5, amplified by the amplifier 6, and inputted to the microcomputer 4. -The microcomputer 4 causes the light emitting diode 8 to blink through the output circuit 7, and sends an optical signal to the optical fiber 1B.

9 is a power supply for each of these parts.

[Problem that the invention seeks to solve]

In this way, conventionally, power is constantly supplied to each circuit, resulting in large power consumption. For this reason, when the battery is not connected to the power source, it wears out quickly and often needs to be replaced. On the other hand,
Before supplying power from outside, the tth distribution a'i
All of these are inconvenient considering that they need to be carried out and are located in remote locations.

[Ninth way to solve the problem]

In the present invention, a switch is inserted between the power source section and the transmitting section, which is made conductive by the output electromotive force of the photovoltaic element of the receiving section.

[For production]

When a certain electromotive force is generated in the photovoltaic element due to the received signal, the switch becomes conductive, and the transmitter becomes operable as a power source for the transmitter.

〔Example〕

FIG. 1 is a block diagram showing one embodiment of the present invention. The basic configuration and operation are the same as those in Figure 3, but
In this embodiment, a normally-off type analog switch 11 is inserted between the power source 9 and the transmitting section including the sensor 2 signal processing section shown by the broken line. Further, a thick battery 12 is used as a light receiving element of the receiving section.

Next, the operation of this embodiment will be explained using the timing chart of FIG. 3A shows a signal arriving from the control room to the communication device of this embodiment, and Φ) in the same figure shows a signal sent from the communication device of this embodiment to the control room. FIG. 2C shows the mode of the analog switch 11.

As mentioned above, normally the analog switch 11 is in a non-conducting state, and the sensor 2, microcomputer 4, light emitting diode 8, etc. are completely disconnected from the power supply 9, so during this period There is no power consumption.

In this state, wake-up pulse 10゛1 is sent from the control room.
When this occurs, an electromotive force is generated in the F solar cell 12, and the analog switch 11 is made conductive via the power control section 13. In response to this, the voltage of the power supply 9 is supplied to each part, and the microcomputer 4 starts its control operation. First, the microcomputer 4 controls the light emitting diode 8 via the output circuit 7 and sends out an acceleration signal 201. In response to this, data 102 is sent from the control room, and predetermined data 202 is also sent from the communication device of this embodiment.

After sending out the data 202, the microcomputer 4 turns off the analog switch 11 via the power control unit 13 and turns off its own power.

In this way, by supplying power to the transmitter including the signal processing section of the sensor 2 only when necessary,
Power consumption can be significantly reduced compared to the case where power is constantly supplied.

In addition, instead of the solar cell for reception, a photodiode,
It goes without saying that other photovoltaic elements such as phototransistors may also be used. Even if the same photoelectric element is used for both reception and transmission, and one optical fiber transmission line is used in common, the process will still be difficult.

(9) In the above-mentioned next embodiment, while no communication is being carried out,
The power supply to the valleys shall be completely cut off, but power may be supplied to some circuit functions, such as registers and liquid crystal display elements, as necessary and in consideration of power consumption. You can also take it lightly.

〔Effect of the invention〕

As described above, according to the present invention, conduction is established between the power source section and at least the transmitting section of the circuit operated by the power source by using the output electromotive force of the photovoltaic element of the receiving section. Compared to a device that requires a switch to be inserted to constantly supply power, power consumption can be significantly reduced. Therefore, batteries can be used as a power source to extend their lifespan. Also, if the power consumption is large, the amount of heat generated is also large (
This is undesirable, especially in a device that transmits the output value of a sensor, since it deteriorates the sensor characteristics, but according to the present invention, the increase in the amount of heat generated by this process can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a timing chart showing its operation, and FIG. 3 is a block diagram showing a conventional example. 1A, IB...optical fiber, 4 fists...microcomputer, 8・◆・ψ light emitting diode, 11...analog switch, 12...sun? l, 13...
power control section. Patent applicant Yamatake Honeywell Co., Ltd. Agent Masaki Yamakawa (and 2 others) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A phase-directional optical communication device comprising a receiving part having a photovoltaic element and a transmitting part having a light emitting element, and a switch which is electrically connected by the output electromotive force of the photovoltaic element is inserted between the power supply part and the transmitting part. .