JPH0382226A - Power line communication modulating/demodulating circuit - Google Patents
Power line communication modulating/demodulating circuitInfo
- Publication number
- JPH0382226A JPH0382226A JP21884389A JP21884389A JPH0382226A JP H0382226 A JPH0382226 A JP H0382226A JP 21884389 A JP21884389 A JP 21884389A JP 21884389 A JP21884389 A JP 21884389A JP H0382226 A JPH0382226 A JP H0382226A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transmission
- reception
- signal
- modulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims description 14
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 3
- 239000013256 coordination polymer Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は海上コンテナ用冷凍ユニットに適用する電力線
を利用した周波数変調方式（ＦＳＫ方式）の通信システ
ムにおける電力線通信変復調回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power line communication modulation/demodulation circuit in a frequency modulation method (FSK method) communication system using power lines, which is applied to a refrigeration unit for a marine container.
第５図および第６図は、それぞれ一般的な変復調回路を
示す図であり、電力線（■■ＲＬＩＮＥ）Ｉとトランス
２を介して変復調専用ＩＣを含む変復調回路３を接続し
、ＣＰＵ４とのコミエニケーシ璽ンによりシステムを構
成するが、信号検出精度向上のためにキャリア検出回路
５を設置する場合も多い。5 and 6 are diagrams showing general modulation/demodulation circuits, respectively, in which a modulation/demodulation circuit 3 including a modulation/demodulation dedicated IC is connected via a power line (■■RLINE) I and a transformer 2, and communication with a CPU 4 is performed. Although the system is composed of a signal, a carrier detection circuit 5 is often installed to improve signal detection accuracy.
電力線は多種多様の負荷が接続されているため、その負
荷から発生する雑音及び負荷インピーダンス変動のため
、通信は非常に難しいとされている。事実、海上コンテ
ナ用冷凍ユニットが使用される船内の電力線に発生する
ノイズも多種にわたっているので第５図および第６図に
示す一般的な変復調回路では、雑音と信号の区別ができ
ないので通信不良が頻繁に発生し、実用に供しない事が
試験により判明している。Since a wide variety of loads are connected to power lines, communication is said to be extremely difficult due to noise generated from the loads and fluctuations in load impedance. In fact, there are many different types of noise that occur on the power lines inside ships where marine container refrigeration units are used, so the general modulation/demodulation circuits shown in Figures 5 and 6 cannot distinguish between noise and signals, resulting in poor communication. Tests have shown that this occurs frequently and is not practical.
本発明の課題は、上記従来の問題点を解消することがで
きる電力線通信変復調回路を提供することである。An object of the present invention is to provide a power line communication modulation/demodulation circuit that can solve the above conventional problems.
本発明による電力線通信変復調回路は、電力線を利用す
る周波数変調方式（ＦＳＫ方式）の通信システムにおい
て、信号検出回路および変復調回路に特定の周波数帯の
信号を通過・させるフィルタ回路を設けると＼もに、送
信、受信切換用スイッチを設けたことを特徴とする。The power line communication modulation/demodulation circuit according to the present invention can be used in a frequency modulation method (FSK method) communication system using a power line, by providing a filter circuit that allows signals in a specific frequency band to pass through the signal detection circuit and the modulation/demodulation circuit. , a transmitting/receiving switch.
一般的に、ノイズと信号を分離し通信を確実に可能にす
るために、第３図に示すように、目的の周波数帯のみを
通過させるフィルタ回路６を変復調回路３およびキャリ
ア検出回路５の前段に設けることにより、受信精度を大
幅に向上することが可能となる。但し、この回路に於て
は、送信用に別のラインを設ける必要を生じる。また、
一番安易な方法として、第４図に示す送信用の変復調回
路７を別に用意する方法があるが、コスト、スペースの
面から非常に不利である。本発明Ｉこおいては、これを
解消するために、例えば、第２図に示すように、半導体
リレーを用いた送信、受信切換用スイッチ回路８を用い
、回路の簡素化を可能としたものである。Generally, in order to separate noise and signals and ensure communication, a filter circuit 6 that passes only the target frequency band is installed before the modulation/demodulation circuit 3 and the carrier detection circuit 5, as shown in FIG. By providing this, it is possible to significantly improve reception accuracy. However, in this circuit, it is necessary to provide another line for transmission. Also,
The easiest method is to separately prepare a transmitting modulation/demodulation circuit 7 as shown in FIG. 4, but this is very disadvantageous in terms of cost and space. In order to solve this problem, in the present invention I, for example, as shown in FIG. 2, a switch circuit 8 for switching between transmission and reception using a semiconductor relay is used to simplify the circuit. It is.
本発明によれば、フィルター回路は、目的の周波数帯（
通信の搬送波として用いる周波数帯）を通過させる機能
をもっているためキャリア検出及び変復調するデータの
検出に誤検出が少なくなり通信精度が向上するとともに
、また、上記フィルタ回路追加に伴ない、送信路を別途
設ける必要が生じるが、スイッチ回路の追加により、簡
易で信頼性のある回路を提供することができる。According to the present invention, the filter circuit has a frequency band of interest (
Since it has a function to pass the frequency band used as a communication carrier wave, it reduces false detections in carrier detection and detection of data to be modulated and demodulated, improving communication accuracy.In addition, with the addition of the above filter circuit, a separate transmission path is required. However, by adding a switch circuit, a simple and reliable circuit can be provided.
第１図は本発明を海上コンテナ用冷凍ユニットにおける
変復調回路に適用した一実施例を示す回路図であり、Ｒ
，８相と、アース間に信号をのせて通信する方式のもの
である。FIG. 1 is a circuit diagram showing an embodiment in which the present invention is applied to a modulation/demodulation circuit in a refrigeration unit for marine containers.
, 8 phases and ground to communicate.
電力線を介して送られてきた信号はトランス１１を経由
し、フィルタ回路Ｉ２に入る。本フィルタ回路Ｉ２は７
２７Ｇ（ｚ帯を通過させる回路構成となっている。The signal sent via the power line passes through the transformer 11 and enters the filter circuit I2. This filter circuit I2 is 7
27G (has a circuit configuration that allows the Z band to pass through.
信号はフィルタ回路Ｚ２を通り、キャリア検出回路Ｉ３
、変復調回路Ｉ４に入る。The signal passes through filter circuit Z2 and carrier detection circuit I3.
, enters the modulation/demodulation circuit I4.
キャリア検出回路Ｉ３にてキャリアを検出すると、ＣＰ
Ｕｚ５より受信信号を変復調回路Ｉ４に送り受信状態と
なる。この時スイッチ回路Ｉ６は開の状態であり、信号
はスイッチ回路Ｉ６を通過してはこない。引き続き受信
データが送られてきて受信終了となる。送信時は、ＣＰ
Ｕ１５より送信信号を送り、変復調回路Ｉ４は送信状態
となりスイッチ回路Ｉ６は閉状態となる。次にＣＰＵｆ
５より送信データを変復調回路１４に送り、送信が終了
する。When carrier detection circuit I3 detects a carrier, CP
The received signal is sent from Uz5 to the modulation/demodulation circuit I4 to enter the receiving state. At this time, the switch circuit I6 is in an open state, and no signal passes through the switch circuit I6. Reception data continues to be sent, and reception ends. When sending, CP
A transmission signal is sent from U15, the modulation/demodulation circuit I4 goes into the transmission state, and the switch circuit I6 goes into the closed state. Next, CPUf
5, the transmission data is sent to the modulation/demodulation circuit 14, and the transmission is completed.
以上のように、受信時は、フィルタ回路を通過させ、キ
ャリア検出を容易にしデータの変復調検出の精度を向上
させるとともに、送信時は、スイッチ回路の閉により、
同一の変復調回路を用い、簡易で信頼性のある送信を可
能としている。As described above, during reception, the filter circuit is passed through to facilitate carrier detection and improve the accuracy of data modulation/demodulation detection, and during transmission, the switch circuit is closed to
Using the same modulation and demodulation circuit, it enables simple and reliable transmission.
第２図は、本発明の一実施例における変復調回路の構成
を示すブロック図であり、ｌはＰ（７＆■ＲＬＩＮＥ、
ｚはトランス、３は変復調回路、４はＣＰＵ、５はキャ
リア検出回路、６はフィルタ回路、８はスイッチ回路を
示す。FIG. 2 is a block diagram showing the configuration of a modulation/demodulation circuit in an embodiment of the present invention, where l is P(7&■RLINE,
z is a transformer, 3 is a modem circuit, 4 is a CPU, 5 is a carrier detection circuit, 6 is a filter circuit, and 8 is a switch circuit.
信号検出用にキャリア検出回路を用い受信精度向上を実
施しているが、船上、ヤードでのノイズは多種であり、
受信率は１０〜５０％である。Although we are improving reception accuracy by using a carrier detection circuit for signal detection, there are many types of noise onboard ships and in yards.
The reception rate is 10-50%.
さらに、キャリア検出回路にのみフィルタ回路を設けて
も、データ受信確率は同じである。結局、データ受信回
路にもフィルタ回路を設けることにより９９％以上の受
信率となった。すなわち、キャリア検出回路、データ変
復調回路に共通のフィルタを設けることにより受信精度
を上げることが可能となる。Furthermore, even if a filter circuit is provided only in the carrier detection circuit, the data reception probability remains the same. In the end, by providing a filter circuit in the data receiving circuit as well, a reception rate of 99% or more was achieved. That is, by providing a common filter for the carrier detection circuit and the data modulation/demodulation circuit, it is possible to improve reception accuracy.
またデータ変復調回路にフィルタ回路を設けることによ
り、送信回路が別途必要となるが、同一変復調回路を利
用し、スイッチ回路を用いることにより、簡易で、信頼
性のある回路を実現することが可能となる。Also, by providing a filter circuit in the data modulation/demodulation circuit, a separate transmission circuit is required, but by using the same modulation/demodulation circuit and a switch circuit, it is possible to realize a simple and reliable circuit. Become.
第１図は、本発明の一実施例の構成を示す回路図、第２
図は本発明の一実施例の構成を示す１９７５図、第３図
および第４図は、それぞれフィルタを利用した変復調回
路のブロック図、第５図および第６図はそれぞれ一般的
な変復調回路のブロック図である。
Ｉ２・・・フィルタ回路、Ｉ３・・・キャリア検出回路
、Ｉ４・・・変復調回路、Ｉ５・・・ＣＰＵ、７６・・
・スイッチ回路。FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
Figures 3 and 4 are block diagrams of modulation and demodulation circuits using filters, and Figures 5 and 6 are block diagrams of general modulation and demodulation circuits, respectively, showing the configuration of an embodiment of the present invention. It is a block diagram. I2...Filter circuit, I3...Carrier detection circuit, I4...Modulation/demodulation circuit, I5...CPU, 76...
・Switch circuit.
Claims (1)
システムにおいて、信号検出回路および変復調回路に特
定の周波数帯の信号を通過させるフィルタ回路を設ける
とゝもに、送信、受信切換用スイッチを設けたことを特
徴とする電力線通信変復調回路。In a frequency modulation (FSK) communication system that uses power lines, the signal detection circuit and modulation/demodulation circuit are equipped with a filter circuit that passes signals in a specific frequency band, as well as a switch for switching between transmission and reception. A power line communication modulation/demodulation circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21884389A JPH0382226A (en) | 1989-08-25 | 1989-08-25 | Power line communication modulating/demodulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21884389A JPH0382226A (en) | 1989-08-25 | 1989-08-25 | Power line communication modulating/demodulating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0382226A true JPH0382226A (en) | 1991-04-08 |
Family
ID=16726213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21884389A Pending JPH0382226A (en) | 1989-08-25 | 1989-08-25 | Power line communication modulating/demodulating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0382226A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002223183A (en) * | 2001-01-26 | 2002-08-09 | Toyo Commun Equip Co Ltd | Power line bridge |
-
1989
- 1989-08-25 JP JP21884389A patent/JPH0382226A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002223183A (en) * | 2001-01-26 | 2002-08-09 | Toyo Commun Equip Co Ltd | Power line bridge |
| JP4639289B2 (en) * | 2001-01-26 | 2011-02-23 | ネッツエスアイ東洋株式会社 | Power line bridge device |
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