JPS59161939A - Transmitting and receiving device - Google Patents

Abstract

PURPOSE:To use the same circuit for both the supply of power and transmission of information by connecting a capacitor between a pair of circuits which connects a transmitter and a receiver to transfer the power supply at both ends of the capacitor and at the same time providing a transformer having its secondary winding connected in series to a circuit from the juncture of the capacitor. CONSTITUTION:A transmitting/receiving device 1 of the power supply side is connected to a commercial power supply and transmits and receives the power supply and information signals to other transmitting/receiving devices from terminals 4a and 4b via a secondary winding 6b of a transformer 6. Only the component of a power supply VB emerges at both ends of a capacitor 8 connected in parallel to both ends 7a and 7b of a power supply VB. While only the information component emerges at both ends of the winding 6b. These two components can be separated from each other. The information signal delivered from the terminal OUT of a transmitting/receiving logical circuit 13 is modulated by a modulating circuit 11 and transmitted via the transformer 6. The signal transmitted through circuits 5a and 5b undergoes wave detection through a demodulating circuit 12 via the transformer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transmitting/receiving device, and particularly to a transmitting/receiving device that is suitable for transmitting information signals by superimposing them on a power supply line.

Structure of conventional example and its problems The following is a conventional example that is closest to the present invention. This connects the transmitter and receiver with two lines, supplies power from one to the other, and superimposes a signal on the line to transmit information. The power supply and line are connected via a low-pass filter (signal leakage prevention element), and
Superposition of signals.

Separation is performed via a tuning transformer connected in parallel to the line, resulting in a circuit configuration that provides frequency selectivity.

Note that this tuning transformer is provided separately for transmission and reception.

The problems with such a configuration are as follows. That is, two types of coil elements are required, one for the low-frequency Uraha wave device and one for the tuning transformer, and furthermore, the tuning transformer is provided separately for transmitting and receiving, which is very uneconomical. In particular, when trying to apply such a transmitting/receiving device to household electrical equipment, in addition to the cost, the transmitting/receiving circuit must be assembled in a small box called a remote control, making it difficult to store and store. In terms of space, it is very important to be able to configure the device with a small number of parts, and conventional examples have not been able to fully satisfy this requirement.

Purpose of the Invention In order to solve the above-mentioned drawbacks, the present invention realizes a compact and inexpensive transmitting/receiving device with a small number of parts for transmitting information by superimposing information signals on a pair of power supply lines. The purpose is to apply it to a wide range of household electrical equipment.

Structure of the Invention The present invention connects a capacitor between a pair of lines connecting a transmitting and receiving device, transmits and receives power at both ends of the capacitor, and connects a capacitor in series with the line from the connection point of the capacitor to the line side. A transformer to which the secondary winding is connected is provided, and information signals are exchanged via the primary winding of the transformer.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1A and 1B. Figure 1: A person has a power supply source, such as by being connected to a commercial power supply AC10OV, and the transmitting/receiving device that supplies power to other transmitting/receiving devices; This shows the transmitter/receiver on the side.

In Figure 1, 1 shows the entire configuration of the transmitter/receiver on the power supply side, and the commercial power supply AC is connected via terminals 2a and 2b.
Connected to 1oov. 3 is a power supply circuit I, AC1
00V input required for electronic circuit operation, e.g. +12V,
It converts it into a DC voltage such as +6V, or converts it into a power supply VB for transmission to a transmitting/receiving device on the power receiving side.

Terminals 4a and '41> are used to connect lines 5a and sb to supply power to other transmitting/receiving devices and to transmit and receive information signals, and are connected via the secondary winding 6b of a transformer 60 inserted in series. It is connected to both ends 7a and 7b of the power source VB. Both ends 7a of power supply VB.

A capacitor 8 connected in parallel to 7b serves to separate the power supply VB and the information signal together with the transformer 6, and is an important component of the present invention.

That is, by setting the capacitance C of the capacitor 8 and the equivalent inductance L seen from the secondary winding side of the lance 6 to appropriate values, the respective impedances Z with respect to the frequency fK are made to have the characteristics shown in Figure 2. be able to. now,
The frequency of power supply VB is f.

If the frequency of the information signal is f2, the frequency f, the odor ZG':> ZL, the frequency is ZL)> ZC
Therefore, at both ends of the capacitor 8, only the component of the power supply VB is present, and at both ends of the secondary winding 6b of the transformer 6,
The power source V and the information signal are separated by the well-known electric circuit principle that only the information signal component appears.

A modulation circuit 11 and a demodulation circuit 12 are connected to both ends of the primary winding 6a of the transformer 60, and +5V is connected to the intermediate tap.

The information signal (DATA) output from the OUT terminal of the transmission/reception logic circuit 13 is input to the modulation circuit 11, and the 0MO
Carrier wave oscillation section 1111 composed of 8 NAND gates, etc.
After modulating with L, the driving section 11 composed of transistors etc.
b drives the primary winding 6a of the transformer 6,
Generating a modulated information signal.

The information signal generated in the primary winding 6a of this transformer 6 is
The signal is sent out to the lines 5a and 6b via the secondary winding 6b, and transmitted to the other transmitting/receiving device 15.

Conversely, information signals transmitted from other transmitting/receiving devices via the lines 5a and 5b are generated at both ends of the secondary winding 6b of the transformer 6, and appear at the primary winding 6a. This information signal is subjected to pre-processing such as impedance conversion and amplification in the input processing section 12a of the demodulation circuit 12, and then to the detection section 12b.
M detection is performed.

Next, after being shaped into a digital pulse by the waveform shaping section 12c, it is inputted from the IN terminal of the transmitting/receiving logic circuit 13.

In this way, the configuration is simple in that only one transformer 6 is used to perform the superimposition and separation of two information signals and the transmission and reception operations. 14 is an input/output circuit consisting of LRD, keys, switches, relays, volume, sensors, etc., and the input/output information is exchanged with other far away transmitting/receiving logic circuits via the transmitting/receiving logic circuit 13. This is what is communicated to.

Note that it is preferable to use a microcomputer for the transmission/reception logic circuit 13.

Furthermore, by connecting a tuning capacitor 9 in parallel with the primary winding 6 of the transformer 6 to form a tuning transformer 1o having a parallel resonant circuit 10a, information signals to be transmitted and received can have frequency selection characteristics. , so line 5
It is sufficient to consider electromagnetic noise radiated to the outside through a and 6b only for the resonant frequency, and
Conversely, for the same reason, with respect to electromagnetic wave noise entering from the outside, the ability to exclude frequency noise other than the resonance frequency is very strong, and it is possible to realize a transmitting/receiving device with fewer errors in information transmission.

Next, in FIG. 1B, reference numeral 16 indicates the overall configuration of the transmitting/receiving device on the power receiving side. Line 5a is connected to terminals 1eh and 1eb,
sb is connected, and input of transmitted power and input/output of information signals are performed.

The means for separating the power supply and the information signal is as explained in FIG.

It converts it into a stabilized DC voltage such as +5V, and operates the entire transmitting/receiving device 16 on the power receiving side.

Since the other circuit blocks are exactly the same as those explained in FIG. 1, their explanation will be omitted.

Note that the same numbers are used for the same functional blocks.

Effects of the Invention As is clear from the detailed description above, the present invention provides a transmission and reception device in which a capacitor is connected between a pair of lines connecting them, and power is supplied and received at both ends of the capacitor. A transformer with its secondary winding connected in series with the line is installed on the line side from the connection point of the capacitor, and information signals are sent and received through the primary winding of the transformer, making it extremely simple with a very small number of parts. The configuration is inexpensive,
It is a gas water heating material that realizes a transmitting and receiving device that can supply power and transmit information over the same line.

It has become promising to be applied to a wide range of household electrical equipment, including solar water heating systems.

[Brief explanation of the drawing]

1A and 1B are circuit configuration diagrams of a transmitting/receiving device showing an embodiment of the present invention, and FIG. 2 is a circuit characteristic diagram showing the principle of signal separation. 1... Transmitting/receiving device (power supply side), sa, 6b
......[11,6...-Transformer, 61L...Transformer primary winding, 6b...Transformer secondary winding, 8...Mountain...Capacitor (for signal separation) ), 9...
... Capacitor (for tuning), 16... Transmitting/receiving device (power receiving side).

Claims (3)

[Claims] (1) An information signal with a frequency component different from that of the power supply is superimposed on the power supply line, information transmission and power supply are carried out on the same line, and a capacitor is connected between the lines of the opposing transmitter and receiver. , a transformer is provided on the line side from the connection point of the capacitor, the secondary winding of which is connected in series with the line, and the transformer receives and receives power at both ends of the transformer;
A transmitting/receiving device that transmits and receives information signals via the primary winding of the transformer. (2) Change the frequency of the information signal to f7. When the frequency of the power supply is f2°, and the capacitance of the capacitor inserted between the lines is L, the equivalent inductance seen from the secondary side of the transformer inserted in series with the C2 line is 2πf, L)) □ and (□
f, , f2 . so that the relational expression 2πf, C2πf2L 2πf2G is satisfied. The transmitting/receiving device according to claim 1, in which C and L are set. (3) The transmitting/receiving device according to claim 1, wherein a tuning capacitor is connected in parallel to the primary winding of a transformer inserted in series with the line to impart frequency selectivity to the transmission and reception of information signals.