JPS6359121A - Serial signal transmission system - Google Patents

Abstract

PURPOSE:To reduce the number of wires between devices by connecting the 1st and 2nd devices by two leads, supplying an AC power to them, utilizing one half wave of an AC voltage waveform of generatedin the leads for the transmission and allowing the 2nd device to rectify the remaining half wave or the said half wave and that used for the transmission. CONSTITUTION:When the level of a power line 11 is positive with respect to a power line 12, the positive half wave of the AC voltage waveform is fed to a rectifier smoothing circuit comprising a diode D1 and a capacitor C, a current in the direction of arrow A flows to the power line 11 and a DC power driving a remote operating device 2 is extracted across the capacitor C. When the power line 11 is negative with respect to the power line 12, the negative half wave of the AC voltage waveform is fed across the series circuit comprising a resistor R1 and a photo thyristor of a photocoupler PHI. In giving a current to a light emitting diode of the photocoupler PH1 in this state, a current of the direction of arrow B flows to the power line 11 and the current flows to the light emitting diode of the photocoupler PH2 of the device 1.

Description

Detailed Description of the Invention (Objective of the Invention) (Industrial Field of Application) The present invention provides a method for transmitting an AC voltage waveform for power supply to a carrier for serial signal transmission between devices that supply AC power from one side to the other. The present invention relates to a serial signal transmission method for an information transmission system used as an information transmission system.

(Prior Art) FIG. 7 is a schematic configuration diagram of an information transmission system that employs this kind of conventional serial signal transmission method. The configuration is such that a serial signal is transmitted from the main device 1 to the main device 1.

Here, the main device 1 includes a transformer TR, a photocoupler PI-12 consisting of a light emitting diode and a phototransistor, and a resistor R2, and the remote control device 2 includes a photocoupler PH1 consisting of a light emitting diode and a photothyristor, and a resistor R1. We are prepared. The primary winding W1 of the transformer TR is connected to a commercial AC power source 3, the secondary winding W2 is used to supply operating power to the main device 1, and the auxiliary winding W3 is used to supply operating power to the remote control device 2. A power supply line 11.12 for supplying is connected to the connected terminal.

Further, the cathode of the photodiode constituting the photocoupler PH2 is connected to the terminal to which the power line 12 is connected, and the anode of this photodiode is connected to the terminal to which the signal line 13 for receiving signals from the remote control device 2 is connected. It is connected. Further, the anode of the photothyristor constituting the photocoupler PH1 is connected to the terminal connected to the power supply line 11, and the cathode is connected to the signal line 13 through the resistor R1.
are connected to each terminal.

In FIG. 7, the main device 1 is connected to the transformer TR,
Operating power is supplied to the remote control device 2 through power lines 11.12. Here, during the period when the voltage of the signal line 11 is positive with respect to the signal line 12, the photocoupler P )+
When a current is passed through the light emitting diode 1, the photocoupler PH1
When the photothyristor conducts, conduction is called on.
A current flows through the light emitting diode of the photocoupler PH2, turning on the phototransistor. As a result, a signal of "1" is transmitted from the remote control device 2 to the main device 1. Furthermore, when the voltage on the signal line 11 becomes positive in the next cycle, if no current flows through the photodiode of the photocoupler PH1, the phototransitor of the photocoupler PH2 becomes non-conductive (hereinafter referred to as non-conductive), contrary to the above. (referred to as off), a signal of "0" is transmitted from the remote control device 2 to the main device 1.

Thus, according to the information transmission system shown in FIG.
Information can be transmitted using an AC voltage waveform for power supply as a carrier for serial signal transmission.

(Problems to be Solved by the Invention) In the conventional serial signal transmission system described above, in addition to the two power supply lines 11 and 12, another signal-only line 13 is required, and at the same time, errors occur. There was probably a problem with the wiring.

The present invention has been made to solve the above problems, and aims to provide a serial signal transmission system that can reduce the number of wires between devices and reliably prevent incorrect wiring.

[Structure of the invention]

(Means for Solving the Problems) The first invention of this application includes a first device and a
In an information transmission system in which a second device receives alternating current power from one device and rectifies it for use, the first and second devices utilize an alternating current voltage waveform for power supply as a carrier for serial signal transmission. Connect devices with two conductors to supply AC power! At the same time, one half wave of the AC voltage waveform generated in these conductors is used for transmission, and the second device transmits the remaining half wave, or this one half wave and the one half wave used for transmission. It is characterized by rectification.

Further, the second invention of this application is such that a first device and a second device that receives alternating current power from the first device and rectifies it to use the alternating current voltage waveform for power supply. In this information transmission system, the first and second devices are connected by two conductive wires to supply alternating current power, and the alternating current voltage waveform generated on these wires is One half-wave is used for transmission and the remaining half-wave is used for reception, and the second i-device performs full-wave rectification of the half-waves used for transmission and reception.

(Function) Connect the first device and the second device with a cable etc.
Even if the device is configured to receive AC power from the first device, if the second device rectifies the AC voltage and uses it, how many points in one half wave of the AC voltage waveform? Even if one of the positive and negative half waves is missing, or even if some of the positive and negative half waves are missing, it is often possible to supply enough power to operate the second device.

In the first invention of this application, two conductive wires are used for power supply, and one half wave of the AC voltage waveform generated in these conductive wires is used for transmission, and only the remaining half wave is sufficient. If power can be supplied, this half-wave is rectified, and if power is insufficient, the half-wave used for transmission is rectified six times to ensure the necessary power.

Further, in the second invention of this application, two conductors are used for power supply, and one half wave of the AC voltage waveform generated in these conductors is used for transmission, and the other half wave is used for reception. At the same time, each half-wave used for transmission and reception is full-wave rectified to ensure the necessary power.

By doing so, the number of wires between devices can be reduced.

(Embodiment) FIG. 1 is a schematic configuration diagram of an information transmission system for implementing the present invention, and the same reference numerals as in FIG. 7 explaining the conventional system indicate the same elements. here,
The main device 1 and the remote control device 2 are connected to power lines 11 and 12.
signal line 1 shown in Figure 7.
3 has been removed. In addition, in response to this, transformer T
One end of the R auxiliary winding W3 is connected to a terminal connected to the power line 11 via a diode D2, and the other end is connected to a terminal connected to the power line 12. and,
In parallel with diode D2, resistor R2 and photocoupler P)1
A series circuit with two light emitting diodes is connected. On the other hand, in the remote control device 2, the power line 11.12
A series circuit consisting of a resistor R1 and a photothyristor of the photocoupler PH1 is connected between the terminals to which the photocoupler PH1 is connected, as well as a series circuit consisting of a diode D1 forming a half-wave rectifier circuit and a capacitor C smoothing it. .

With the above configuration, for example, when the power line 11 side becomes positive when viewed from the power line 12, the positive half wave of the AC voltage waveform is transferred to the rectifying and smoothing circuit consisting of the diode D1 and the capacitor C, as shown in FIG. A current flows in the direction of arrow A in the power supply line 11, and DC power for driving the remote control device 2 is taken out from both ends of the capacitor C. Next, when the power supply line 11 side becomes negative when viewed from the power supply line 12, the negative half wave of the AC voltage waveform is applied to both ends of the series circuit of the photothyristor of the resistor R1 and the photocoupler PH1, as shown in FIG. be done. In this state, when current is applied to the light emitting diode of photocoupler PH1, power line 1
1, a current flows in the direction of arrow B, and this current flows to the light emitting diode of the photocoupler PH2 in the main device 1.

As a result, "1" is sent from the remote control device 2 to the main device 1.
signal is transmitted. Also, in this state, Botokabura PH
If no current is passed through the light emitting diode 1, it is a photocoupler P.
)-12, no current flows either, and therefore a signal of "0" is transmitted from the remote control device 2 to the main device 1.

In this way, a system is formed in which one half wave of the AC voltage waveform is used for transmission, and the remote control device 2 rectifies the remaining half wave to obtain the necessary power.

Next, FIG. 3 is a schematic configuration diagram of another information transmission system for implementing the present invention, and the same reference numerals as in FIG. 1 indicate the same elements. Then, the remote control device 2 is provided with Hol-Kabra PH3, and
The photothyristor of this photocoupler PH3 and the diode D1. The difference from FIG. 1 is that a full-wave rectifier circuit is formed by D2 and D3. In addition, Hotokabura P1"1
The light emitting diode of the photocoupler PH3 and the light emitting diode of the photocoupler PH3 are connected in series.

With this configuration, the positive half wave of the AC voltage waveform is directly applied to the capacitor C and used for its charging. On the other hand, the negative half wave of the AC voltage waveform is connected to the resistor R1 and the photocoupler PH.
When current is applied to both ends of the series circuit with photothyristor 1 and current is applied to the light emitting diodes of photocoupler PH1 and PH2, a signal of ``1'' is transmitted to main device 1 as described above, and this The negative half wave used for signal transmission passes through the diode D3 and the photothyristor of the photocoupler PI-13 and is used to charge the capacitor C. At this time, the voltage shown in FIG. 4(a) is generated in the power supply line 11, and the full-wave rectified voltage shown in FIG. 4(b) is applied to the capacitor length C, thereby supplying the necessary power.

In this way, a system is formed in which one half wave of the AC voltage waveform is used for transmission, and the remote control device 2 rectifies the remaining half wave and the half wave used for transmission to obtain the necessary power.

Next, FIG. 5 is a schematic configuration diagram of another information transmission system for implementing the present invention, and the same reference numerals as in FIG. 3 indicate the same elements. And in place of the diode D2 in Figure 3, a photocoupler P
The difference from FIG. 3 is that a photothyristor H5 is connected and a series circuit of a resistor R1 and a light emitting diode of a photocoupler PH4 is newly connected between the power line connection terminals of the remote control device 2.

In FIG. 5, for example, the photocoupler P1'5 of the main device 1 corresponds to the positive half wave of the odd cycle of the IS voltage waveform.
When a current is passed through the light-emitting diodes of , and current is passed through the light-emitting diodes of the photocouplers P1-11 and PI-13 of the remote control device 2 for the negative half wave, the diagonal lines shown in Fig. 6(a) are applied. The partial voltage is full-wave rectified and applied to capacitor C. Next, when a current is passed through the light emitting diode of the photocoupler PH5 during the period when the positive half wave of the even number cycle occurs,
This half wave is also applied to the capacitor, but the photocoupler P
Current flows through the light emitting diode of H4, turning on the phototransistor. In this system, the signal is transmitted only in even cycles of the power supply voltage waveform, so the NJ signal is sent from the main unit "device 1" to the remote control device 2. When a current is passed through the light emitting diodes of the photocouplers PH1 and PH3 during the period in which a half wave of
It is sent from the fA operation mode device 2 to the main device 1. In this way, ffi? A serial signal can be transmitted from the main device 1 to the remote control device 2 by using the positive half wave of the even number cycle of the li voltage waveform, and further, the serial signal can be sent from the remote control device 2 to the main device by using the negative half wave of the even number cycle. Serial signals can be sent to 1.

FIG. 6(a) shows "1001" when viewed from the remote control device 2.
An example is shown in which a signal of II 110J is received and a signal of II 110J is transmitted. Further, FIG. 6(b) shows the voltage waveform applied to the capacitor C, which ensures the necessary power.

In this way, there is a system in which one half wave of the AC voltage waveform is used for transmission and the other half wave is used for reception, and the remote control device 2 secures operating power by full-wave rectification of the half wave used for transmission and reception. realizable.

In the above embodiment, power is supplied in the odd cycles of the AC voltage waveform, signals are transmitted in the even cycles, and the transmitted waveform is used as power, but any other suitable cycle may be selected to transmit the signal. You can.

Furthermore, in the above embodiment, information transmission between the main device and the remote control device was explained, but the first device and the first device receive alternating current power, rectify it, and use it. The present invention can be applied to any connection between the device and the second device.

〔Effect of the invention〕

As is clear from the above description, according to the present invention,
Compared to the conventional method, this method has the effect of reducing the number of wires for equipment bolts and reliably preventing incorrect wiring.

[Brief explanation of drawings]

1, 3, and 5 are schematic configuration diagrams of various information transfer systems for implementing the present invention, and FIGS. 2, 4, and 6 explain the operation of each information transfer system. FIG. 7 is a schematic diagram of an information transfer system employing a conventional serial signal transmission method. 1...Main device, 2...Remote control device, 3...AC power supply, 11.12...Power line, TR...Transformer, Pl (1 to P I-15... Photocoupler, R1
to R5...resistance, Dl, D3. D4...Diode, C...Capacitor. Applicant's agent Mr. Sato Figure 7

Claims (1)

[Claims] 1. A first device and a second device that receives AC power from the first device and rectifies it for use, converting the AC voltage waveform for power supply into a serial signal. In an information transmission system used as a transmission carrier, the first and second devices are connected by two conductive wires to supply alternating current power, and one half wave of an alternating current voltage waveform generated in these conductive wires is transmitted. A serial signal transmission system characterized in that the second device rectifies the remaining half-wave, or this half-wave and the half-wave used for transmission. 2. The first device and the second device, which receives AC power from the first device and rectifies it for use, use the AC voltage waveform for power supply as a carrier for serial signal transmission. In the information transmission system, the first and second devices are connected by two conductive wires to supply AC power, and one half of the AC voltage waveform generated in these conductors is used for transmission, and the other half is used for transmission. A serial signal transmission method characterized in that each wave is used for reception, and the half-wave used for transmission and reception by the second device is full-wave rectified. 3. The serial signal transmission method according to claim 2, wherein the transmission and reception are performed by selecting appropriate cycles of an AC voltage waveform.