JPH0250697B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides power supply between various devices, and between various devices located far apart, such as devices and remote controllers, through three electric wires. The present invention relates to a power supply and communication device using three electric wires, which performs communication between the two directions.

(Prior Art) Among various devices located at separate locations, one device connected to a power source (hereinafter referred to as the main device) is connected to the other device not connected to the power source (hereinafter referred to as the slave device). ) and two-way communication between the main device and the slave device, there is a method of connecting the main device and the slave device using three wires for power supply, communication, and grounding. It's been around for a long time. Compared to the method using only two electric wires, this method uses separate power lines and signal lines, so there is less burden on the power supply, and therefore fewer circuit components are needed, making it cheaper and more resistant to external noise. This device has advantages such as being able to use a stable power source in the slave device, which greatly simplifies circuit design, and resulting in low power consumption.

(Problem to be solved by the invention) However, conventionally, the
It is necessary to correctly match the three terminals of each of the main device and the slave device, and if the three wires are incorrectly connected, the device may not operate, or worse, the circuit elements may be destroyed.

The purpose of the present invention is to solve the above-mentioned conventional problems, to enable normal operation no matter how the three electric wires are connected, and to essentially prevent erroneous connections from occurring. be.

(Means for Solving the Problems) To explain the means for solving the above problems with reference to drawings corresponding to embodiments, the power supply and communication device using three electric wires of the present invention has a power source 1 connected to the power source 1. Both the main device M to be connected and the slave device S not connected to the power supply 1 have three terminals for power supply, communication and grounding.
Three terminals a for connecting each of the electric wires 2,
b, c, x, y, and z, and the main device M includes a power supply circuit 3, a communication circuit 4, and a grounding circuit 12 corresponding to each of these terminals. It is configured to transmit and receive signals within the range of the supply voltage of the power supply circuit 3, and the slave device S
In this case, the AC input sides of the three sets of diode series circuits _d3 , which constitute the components of the bridge rectifier circuit 6, are connected to the three terminals x, y, and z, and their DC output sides are connected to the power source. A power supply circuit 7 is configured to supply a power source, and a communication circuit 5 is connected to the three terminals x, y, and z. The two exclusive OR circuits g ₁ and g ₂ are connected to the three terminals x, y, and z, and the two input sections on one side and one input section on the other side are connected to the three terminals x, y, and z, and the output section on the other side is connected to the three terminals x, y, and z. A receiving circuit 10 serving as a receiving output section and a transmitting circuit 11 supplying a transmitting signal within the range of the supply voltage to all of the three terminals x, y, and z are provided.

(Function) In the above configuration, the three terminals a, b, c of the main device M and the three terminals x, y, z of the slave device S
Three electric wires 2 (2a, 2b,
2c), a bridge is connected between the terminals x and z of the slave device S corresponding to the power supply terminal a and the grounding terminal c of the main device M by a pair of diode series circuits _d3 corresponding to each other. A rectifier circuit 6 is formed, and thus power is supplied to the slave device S.

On the other hand, the above-mentioned three input parts of the receiving circuit 10 are a power supply terminal a and a grounding terminal c of the main device M.
and communication terminal b, and two of them corresponding to power supply terminal a and grounding terminal c are held at the supply voltage and ground voltage, but when communication terminal b The transmission signal from the main device M that is input to the corresponding input section, that is, the signal within the range of the supply voltage, is output from the reception output section through the two exclusive OR circuits g ₁ and g ₂ of the reception circuit 10. and predetermined reception is performed.

Furthermore, the transmission circuit 11 of the slave device S supplies transmission signals to all three terminals x, y, and z, and two of these terminals x and z are connected to the supply voltage as described above. Since it is held at ground voltage, this transmitted signal, which is a signal within the range of the supply voltage, appears only at the terminal y corresponding to the communication terminal b of the main device M, and is connected to the main device M via the electric wire 2. It can be transmitted to the communication circuit 4 of the main device M via the communication terminal b of the main device M.

As mentioned above, the above operation is performed using the three terminals a, b, c of the main device M and the three terminals x,
Three electric wires 2a, 2 are connected by appropriately corresponding y and z.
This can be done when the connections are made using b and 2c, so there is essentially no possibility of erroneous connections.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system explanatory diagram showing an outline of the overall configuration of the present invention, where M indicates a main device connected to an appropriate power source 1 such as a household power source, and S indicates a slave device not connected to such power source 1. These are three electric wires 2, 2 for power supply, communication and grounding, respectively.
Three terminals a, b, c, x, y, and z are configured to connect terminals a, 2b, and 2c, respectively. Terminals a, b, and c of the main device M are fixed terminals for power supply, communication, and grounding, respectively, and therefore electric wires 2a, 2b, and 2c connected to these terminals are used for power supply, communication, and grounding, respectively. It serves as a communication and grounding wire.

The main device M includes a power supply circuit 3, a communication circuit 4, and a grounding circuit 12 corresponding to each of the three terminals a, b, and c. It is configured to transmit and receive signals within the range of . For example, the communication circuit 4
As shown in FIG. 2, the circuit is equipped with a switching circuit using a transistor Q ₁ and a level conversion circuit using a Sienna diode d ₁ .
When a transmission signal is input, the transistor _Q1 turns ON and OFF in response to it, and emits a signal within the range of the supply voltage as shown in FIG. 5 to terminal b, that is also within the range of the supply voltage, as shown by the dashed line in FIG.
It is converted to a predetermined level by _d1 and received. In addition to this configuration, the communication circuit 4 transmits a transmission signal within the range of the supply voltage of the power supply circuit 3, and the communication circuit 4 transmits a transmission signal within the range of the supply voltage of the power supply circuit 3, and the power supply circuit 3 from the slave device S
Any configuration that can receive signals within the range of the supply voltage is suitable. Further, the specific configuration of the power supply circuit 3 is arbitrary, such as configuring an overcurrent protection function.

Next, in the slave device S, each of the AC input sides of three sets of diode series circuits _d3 forming the constituent elements of the bridge rectifier circuit 6 is connected to the three terminals x, y, and z, and the DC output side thereof is connected to the three terminals x, y, and z. A power supply circuit 7 configured to connect and supply power, and a communication circuit 5 connected to the three terminals x, y, and z are provided, and the communication circuit 5 connects the output of one side to one of the inputs of the other side. Two exclusive OR circuits g ₁ and g ₂ are provided, and the 2 of g ₁ on one side
a receiving circuit 10 in which one input part on the other side _g2 is connected to the three terminals x, y, z, and the output part on the other side _g2 is a reception output part;
A transmitting circuit 11 is configured to supply transmitting signals within the range of the supply voltage to all of the three terminals x, y, and z. The power supply circuit 7 may include an appropriate power supply stabilization circuit. Further, the receiving circuit 10
Similarly to the communication circuit 4 of the main device M, a level conversion circuit using a Zener diode _d2 is provided. Further, the transmitting circuit 11 transmits the transmitting signal to the three terminals x, through a common transistor _Q3 .
Output transistor Q ₂ corresponding to each of y and z
The DC output side of the diode series circuit _d3 is connected to each emitter of the output transistor _Q2 , and the collector of each is connected to the respective terminals x, y, and z. It's made up of. In the above configuration, the power source is configured as a positive power source, but it goes without saying that it can also be configured as a negative power source.

In the above configuration, as shown in FIG. When the terminal x of the slave device S is first connected to the terminal x of the slave device S, a positive supply voltage is applied from the power supply circuit 3 of the main device M through the electric wire 2a. The diode series circuit _d3 is provided as a DC power source for the slave device S through the positively connected diode, and current flows into the terminal z from the grounding circuit 8 through the reversely connected diode, and the electric wire 2c, Then, it flows back to the main device M via the terminal c.

In this state, the transmission signal applied from the communication circuit 4 of the main device M to the terminal y through the electric wire 2b is a signal within the range of the supply voltage supplied by the power supply circuit 3 as described above. y
Due to the series diode circuit _d3 of the bridge rectifier circuit 6 corresponding to the above, there is no interference with the power supply circuit 7 and the ground circuit 8. The transmission signal applied to this terminal y is level-converted by the Zener diode _d2 and is input to the exclusive OR circuit _g1 on one side. This signal is this exclusive OR circuit g ₁
is compared with the level-converted supply voltage, so that at its output there appears a signal that changes each time the transmitted signal changes within the range of the supply voltage. The signal at this output section is compared with the ground voltage in the exclusive OR circuit _g2 on the other side, so that an output that changes in accordance with the transmission signal appears at the output section. The signal is output from the reception output section and predetermined reception is performed.

Next, the common transistor Q ₃ of the transmitting circuit 11
When a signal to turn it on and off is input to the base of , this signal is input to the base of output transistor Q ₂ , but the collector voltage of output transistor Q ₂ corresponding to terminals x and z is Only the collector voltage of the output transistor Q 2 corresponding to terminal b changes in accordance with the signal, and the collector voltage of the output transistor Q ₂ corresponding to terminal b remains unchanged while being held at the supply voltage and ground voltage, respectively. The signal is then sent to the communication circuit 4 of the main device M, and is received by the operation described above.

The device of the present invention operates as described above, but since the slave device S has the same configuration for each terminal x, y, z, the electric wires 2a, 2b, 2c are connected to the terminals x, y, z. No matter which one is connected, the same operation as described above is performed, and there is essentially no possibility of erroneous connection. Therefore, the connection work is easy and damage to the circuit elements can be prevented.

Further, in the device of the present invention, the main device M and the slave device S are one
Of course _, in the case of one-to _- one correspondence, as shown in FIG.
A configuration in which a plurality of S ₃ , ...) are connected may also be used. For example, as shown in FIG. 5a, the connection method is as follows:
and a plurality of slave devices S are connected in parallel using three electric wires 2, respectively, or the main device M and slave devices S (S ₁ , S ₂ , S ₃ ,...) are connected in parallel as shown in FIG. 7b. They can be connected in a daisy chain configuration or in combination. In these connections, the main device M and each slave device S (S ₁ , S ₂ , S ₃ ,...)
In addition to communicating with them in a time-sharing manner,
The transmission signal from the main device M and each slave device S (S ₁ ,
By adding the identification signal of each slave device S (S ₁ , S ₂ , S ₃ , ...) to the transmission signal from S ₂ , S ₃ , ...), it is possible to prevent the signals of each set from interfering. Therefore, the desired set of communications can be reliably performed.

As described above, the present invention provides power supply from the main device M to the slave device S in various devices located far apart, such as between various devices located apart or between devices and remote controllers. Two-way communication can be performed between the devices S, and in this way, it is possible to supply a predetermined power between various devices and perform various controls by communicating data and control signals. In the present invention, the main device M and the slave device S are distinguished based on whether or not they are connected to a power source, and are not distinguished based on the relationship between master and slave in operations such as control.

(Effects of the Invention) As described above, the present invention has a configuration in which a main device connected to a power source and a slave device are connected via three electric wires for power supply, communication, and grounding, and the slave device has
For the three terminals corresponding to the three electric wires,
Since the power supply circuit and the communication circuit are configured in the same way, they will operate normally no matter how the three wires are switched and connected. This has the effect of making work easier and preventing damage to circuit elements.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing the overall configuration of the present invention, FIGS. 2 and 3 are concrete explanatory diagrams of main parts of the main device and slave device, respectively, and FIGS. Figure, 3rd
FIGS. 5a and 5b are explanatory diagrams of specific signals in the configuration shown in the figure, and are illustrations of an embodiment in which the configuration of the present invention is applied to a plurality of slave devices S. Code M...Main device M, S (S ₁ , S ₂ , S ₃ ,...)...
...Slave device, 1...Power supply, 2 (2a, 2b, 2c)
... Electric wire, 3 ... Power supply circuit, 4, 5 ... Communication circuit, 6 ... Bridge circuit, 7 ... Power supply circuit,
8, 12...Grounding circuit, 9...Power stabilization circuit,
10... Receiving circuit, 11... Transmitting circuit, a, b,
c, x, y, z...terminal, _d1 , _d2 ...Zener diode, _d3 ...diode series circuit, _Q1 , _Q2 ,
Q ₃ ...transistor.

Claims (1)

[Claims] 1 Configure three terminals for connecting each of the three electric wires for power supply, communication, and grounding to both the main device connected to the power source and the slave device not connected to the power source, and the main device , a power supply circuit, a communication circuit, and a grounding circuit corresponding to each of these terminals are configured, and the communication circuit is configured to transmit and receive signals within the range of the supply voltage of the power supply circuit, and the slave device includes a , a power supply circuit configured to supply power by connecting each of the AC input sides of three sets of diode series circuits forming the constituent elements of the bridge rectifier circuit to the three terminals, and connecting their DC output sides; and a communication circuit connected to the three terminals, the communication circuit comprising two exclusive OR circuits whose output on one side is one of the inputs on the other side,
A receiving circuit in which the two input sections on one side and one input section on the other side are connected to the three terminals, and the output section on the other side is a reception output section, and the supply voltage is applied to all of the three terminals. 3, characterized in that it is provided with a transmitting circuit that supplies a transmitting signal within the range of
Power supply and communication equipment using electric wires.