JPH0662650U - Data transmission device using power line - Google Patents

Abstract

(57) [Abstract] [Purpose] A transformer that does not require the adjustment process of the transformer, which is realized by using a capacitor to insulate the power line from the transmission / reception unit and resonates with the frequency of the carrier wave by providing a pseudo inductance circuit To provide a data transmission device using a power line that realizes a wireless communication. In a data transmission device including a transmission / reception unit including a transmission unit and a reception unit connected to a power line connection terminal, the carrier for data is superimposed on a commercial power source for transmission or reception, and one of the power line connection terminals is provided. A capacitor is inserted and connected between one output end of the transmitter and the other of the power line connection terminals and one input end of the receiver, and one output end of the transmitter and the other end of the receiver are connected. The input terminal is commonly connected, and the first pseudo-inductance circuit is further inserted and connected, and one input terminal of the receiving section and the other output terminal of the transmitting section are commonly connected, and further the second pseudo-inductance is further connected. The circuit includes a transmission / reception unit to which a circuit is inserted and connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a data transmission device using a power line.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a data transmission device that connects a communication device to a power line such as a home power line and performs communication using a carrier wave has been put into practical use. A conventional data transmission device using this kind of power line is shown in FIG. 1 and 2 are power line connection terminals for connecting to a power line (AC100V), 3 is a transmission / reception unit, 31 is a transformer having a primary coil 31a and a secondary coil 31b, and a secondary coil 3 1b side is a power line connection terminal 1 , 2 is connected. A capacitor 32 is inserted between one end of the secondary coil 31b and the connection terminal 4. A capacitor 33 is inserted and connected between both ends of the primary coil 31a. Reference numeral 34 denotes a transmitter for transmitting data as a carrier wave, and its output ends 34a and 34b are connected to one end of the primary coil 31a of the transformer 31 and its midpoint 31c. Reference numeral 35 is a receiving unit for receiving the transmitted carrier wave, and its input ends 35a and 35b are the same as the output end of the transmitting unit 34. A control unit (microcomputer) 4 controls the transmitting unit 34 and the receiving unit 35 to control switching between transmitting and receiving data.

In the conventional data transmission device using the power line shown in FIG. 4, when transmitting data, the control unit 4 sets the communication line to the power line and controls the transmission unit 34. , A carrier wave of a predetermined frequency is sent from the stage of starting communication. This carrier wave carries out data transmission by superimposing a carrier wave of 125 KHZ or 165 KHZ on an alternating current of a commercial power supply AC 100 V (50 HZ / 60 HZ) flowing through a power line.

[0004]

[Problems to be solved by the device]

 However, in such a conventional data transmission device, a transformer 31 having a primary coil 31a and a secondary coil 31b is used, but this transformer 31 has a characteristic of having both an insulation characteristic and a frequency selection characteristic, and therefore has a power line and transmission / reception. Although the unit 3 can be insulated, the adjustment process is required because it is necessary to adjust the transformer 31 so as to resonate with the frequency of the carrier wave. That is, the conventional device has a drawback that the device is large in size because the transformer is used, and that the unit cost of the parts is expensive and the adjustment process is required. The present invention has been made to eliminate such conventional drawbacks, and an object of the present invention is to provide a data transmission device using a power line that is transformerless and does not require an adjustment process and is inexpensive. It is in.

[0005]

[Means for Solving the Problems]

 In order to achieve this object, the present invention provides a data transmission device that includes a transmission / reception unit that includes a transmission unit and a reception unit that are connected to a power line connection terminal, and that superimposes a carrier wave serving as data on a commercial power source for transmission or reception. A capacitor is inserted and connected between one of the power line connection terminals and one output end of the transmission section, and the other of the power line connection terminals and one input end of the reception section. The output terminal of the receiver and the other input terminal of the receiver are commonly connected, and the first pseudo-inductance circuit is further inserted and connected, and one input terminal of the receiver and the other output terminal of the transmitter are connected. It is characterized in that it is provided with a transmission / reception unit that is commonly connected and further has a second pseudo-inductance circuit inserted therein.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a data transmission device using a power line according to an embodiment of the present invention. In FIG. 1, the same symbols as those in FIG. 4 indicate the same things. Reference numeral 5 is a transmission / reception unit according to the present invention. One end of a capacitor 51 is connected to a power line connection terminal 1 connected to a power line (AC100V), and the other end is an output end 53a of a transmission unit 53 for transmitting a carrier wave. It is connected. On the other hand, one end of a capacitor 52 is connected to the connection terminal 2, and the other end is connected to an input end 54a of a receiver 54 for receiving a carrier wave sent from a power line. The output end 53a of the transmitter 53 and the input end 54b of the receiver 54 are commonly connected, and a pseudo inductance circuit 55 (first pseudo inductance circuit) is inserted and connected. Similarly, the output end 53b and the input end 54a are commonly connected, and the pseudo inductance circuit 56 (second inductance circuit) is inserted and connected. The transmission unit 53 and the reception unit 54 are connected to and controlled by the control unit (microcomputer) 4, respectively.

In the data transmission device using such a power line, the characteristics of the coupling portion between the power line and the transmission / reception unit 5 are as follows: (a) The commercial power supply AC100V is directly applied to the power supply voltage of the transmission / reception unit 5 of about 5V. Therefore, it is necessary to secure the circuit operation as the transmission / reception unit 5. (b) Further, it is necessary to be able to transmit or receive the data composed of the carrier wave having the frequency of 125 KHZ or 165 KHZ without being attenuated. Therefore, in the data transmission device using the power line of the present invention, the insulation between the power line and the transmission / reception unit 5 is realized by using the capacitors 51 and 52. Moreover, by providing the pseudo-inductance circuits 55 and 56, it is possible to realize a transformerless configuration in which the transformer need not be adjusted to resonate with the frequency of the carrier wave.

FIG. 2 shows an example of the relationship between the capacitors 51 and 52 and the pseudo-inductance circuits 55 and 56 of the coupling circuit according to the present invention. The pseudo inductances 55 and 56 are equivalently composed of a series circuit of a resistance element R and an induction coil L, respectively. In FIG. 2, the impedance of the capacitor 51 and the pseudo inductance circuit 55 of the coupling circuit is expressed by the following equation. ZC1 = 1 / 2πfC1 (1) ZL1 = 2πfL1 (2) With respect to the commercial power supply of 100V, 50HZ or 60HZ, the impedance of ZL1 is low and the impedance of ZC1 is high, so the voltage level of the commercial power supply at point a Decays. On the other hand, for a carrier of 125 KHZ or 165 KHZ, the impedance of ZL1 is high and the impedance of ZC1 is low, so the carrier level at point a is not attenuated. The same applies to the impedances ZL2 and ZC2 of the capacitor 52 and the pseudo inductance circuit 56. Therefore, the carrier wave can be sent without attenuation during transmission, and the carrier wave can be extracted without attenuation during reception. Therefore, a transformerless structure can be realized, so that it is possible to make adjustments inconsistent. If these structures are integrated into an IC, the size can be made extremely small.

In the data transmission device using such a power line, when transmitting data, the control unit 4 sets the communication line to the power line, controls the transmission unit 53, and starts communication. A carrier wave of a predetermined frequency is flown from. As shown in FIG. 3, this carrier wave carries out data transmission by superimposing a carrier wave of 125 KHZ or 165 KHZ on the alternating current of the commercial power supply AC100V (50HZ / 60HZ) flowing through the power line.

[0010]

[Effect of device]

 As is apparent from the above description, the present invention realizes the insulation between the power line and the transmission / reception unit by using a capacitor, and the pseudo-inductance circuit is provided to achieve a transformerless configuration. This has the effect of providing a compact, compact and inexpensive system.

[Brief description of drawings]

FIG. 1 is a block diagram of a data transmission device showing an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing an embodiment of a coupling circuit of the data transmission device of the present invention.

FIG. 3 is an explanatory diagram showing a state in which a carrier wave is superimposed on a commercial power supply and data is transmitted in the data transmission device of the present invention.

FIG. 4 is a block diagram showing a conventional data transmission device.

[Explanation of symbols]

 1, 2 Power line connection terminal 3 Transmission / reception unit 31 Transformer 32, 33 Capacitor 34 Transmission section 35 Reception section 4 Control section (microcomputer) 5 Transmission / reception section 51, 52 Capacitor 53 Transmission section 54 Reception section 55, 56 Pseudo-inductance circuit

Claims (1)

[Scope of utility model registration request] 1. A data transmission apparatus comprising a transmission / reception unit including a transmission section and a reception section connected to a power line connection terminal, wherein a carrier wave to be data is superimposed on a commercial power source for transmission or reception. A capacitor is inserted and connected between one and one output end of the transmission unit and the other of the power line connection terminals and one input end of the reception unit, and one output end of the transmission unit and the reception unit. The other input end is commonly connected and the first pseudo-inductance circuit is further inserted and connected, and one input end of the receiving unit and the other output end of the transmitting unit are commonly connected and the second pseudo-inductance circuit is further connected.
A data transmission device using a power line, wherein a transmission / reception unit in which the pseudo-inductance circuit is connected is provided.