KR960002843B1 - Safety watching terminal controlling device for power line communication - Google Patents

Abstract

a logical part connected to first and second power lines, for performing a control process of signal change in the power lines; a device address generating part having a plurality of resistors and a plurality of switches, for assigning an inherent address of the device; an area address generating part having a plurality of resistors and a plurality of switches, for assigning an area address to limit the scope of an electric power line network information exchange; a modulating/demodulating part for modulating an analog modulating signal received from the power lines or for transmitting a digital signal generated from a logical part to the power lines; a power line signal coupling part having a coupling transformer and two capacitors, for transmitting a modulated signal between the modulating/demodulating part and for isolating an alternate current power signal; a sensor interface part for transmitting safe state information to the logical part; and a power part for supplying a direct current to the device.

Description

Safety monitoring terminal control device for power line communication

1 is a block diagram of the present invention.

2 is a partial detail of FIG.

3 is a flow chart of the present invention.

* Explanation of symbols for main parts of the drawings

1: Management system 10-1n: Sensor

101-1nn: Terminal Controller S ₁ -S _n : Sensor

210: power line signal coupling unit 230: modulation demodulation unit

240 logic unit 250 sensor interface unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety monitoring terminal control apparatus for power line communication, which uses power line communication to collect and control processing information signals related to monitoring and control in a monitoring system for remotely monitoring and controlling the state of various target objects.

In the conventional safety system, a sensor detects a safe state of an object by an sensor in an automated system and transmits data using an AC power waveform of a power line when an abnormal state occurs. Therefore, the monitoring and control system using the power line as a transmission path is used by the AC power signal components depending on the synchronization signal processing, so that the transmission speed is limited to the frequency or twice the speed of the AC power signal, so that the transmission speed is low and AC in case of power failure There is a problem that communication is not performed because synchronization is not achieved due to the absence of signal components.

Accordingly, an object of the present invention is to perform asynchronous communication processing regardless of the frequency component of the AC power signal in the monitoring system using the power line, communication is possible even in the event of power failure, circuit part with a zero detection function is unnecessary, and circuit-simple frequency It is an object of the present invention to provide a safety modulation device for power line communication using a modulation method.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a monitoring system using typical power line communication, including a communication line 2, power lines L ₁ and L ₂ , a plurality of monitoring sensors S ₁ to S _n for monitoring the state of various objects; Main controller 10-1n connected to a power line to monitor the states of the sensors S ₁ to S _n , and a plurality of terminal controllers 10-1nn responsible for receiving, transmitting, and controlling information through a power line. ), and a power line (L _1, a plurality of sensors that are connected to the _{L 2) (S 1 ~ S} n) of the plurality of the terminal controller (101-1nn) for managing information, and with the power line (L _1, L ₂ ) And a management system 1 for processing and controlling information transmitted through a plurality of main controllers 10-1n responsible for signal conversion and control processing between the communication line 2 and the communication line 2.

FIG. 2 is a detailed circuit diagram of the terminal controllers 101-1nn in FIG. 1, which is a circuit diagram of the present invention, which is connected to the power line L ₁ and L ₂ and the power line to perform control processing in signal conversion processing. And a device address generator 241 consisting of a plurality of resistors R ₂ -R ₉ and a plurality of switches SW ₁ -SW ₈ to assign a unique address of the device. In order to allocate the belonging power line communication area address, the area address generator 242 comprising a plurality of resistors R ₁₀ -R ₁₃ and a plurality of switches SW ₉ -SW ₁₂ , power lines L ₁ , L ₂ , and Connected between the logic units 240 to demodulate an analog modulated signal received from the power lines L ₁ and L ₂ into a digital signal or to transmit a digital signal generated from the logic unit to the power lines L ₁ and L ₂ . the modem is configured such as resistance (R ₁₎ and a capacitor (C _1, C ₂₎ to the modulation processing to the analog signal 230, is connected between the modem part 230 and the power line (L _1, L ₂₎ passes the modulated signals between the modem part 230 and the power line (L _1, L ₂₎ and a power signal In order to separate the power line signal coupling unit 210 consisting of a coupling transformer (CT1) and two capacitors (C ₃ , C ₄ ), a plurality of sensors (S ₁ ~ S _n ) for monitoring various conditions and the logic unit A sensor interface unit 250 for connecting the outputs of the sensors S ₁ to S _n to the logic unit 240, and a power supply unit 220 for supplying DC power to the terminal control unit 240. And the like.

3 is a flowchart of the present invention and is performed by the logic unit 240 in the second diagram.

The present invention will be described in detail with reference to FIG. 2 above.

When a change of state occurs in the monitoring sensors S ₁ to S _n , the sensor interface unit 250 transmits the change to each allocated terminal of the port Po of the logic unit 240.

Power line signal coupling unit 210 to send or receive an information signal modulated on the power line (L ₁ ~ L _2), receives the modulated information signal from the power line (L _1, L ₂₎ is passed to the communication interface unit 250 .

The portion composed of the coupling capacitor (C ₄ ) and the coupling transformer (CT1) in the power line signal coupling unit 210 serves as a high-frequency filter for passing the modulated information signal while removing the AC power signal component, the coupling transformer The portion composed of the CT1 and the tuning capacitor C ₃ serves as a bandpass filter centering on the carrier frequency of the modulated information signal and transmits the information to the communication interface 250. When the logic unit 240 transmits the information signal to the power line L ₁ L ₂ , the portion composed of the coupling transformer CT1 and the tuning capacitor C ₃ removes the high frequency of the carrier frequency, and the coupling capacitor C ₄ ) and the combination transformer CT1 serve to superimpose the information signal on the AC power signal.

When the modulation demodulator 230 is to transmit the information signal generated by the logic unit 240 to the power lines (L ₁ , L ₂ ), the frequency demodulation is modulated by the modulation demodulator 230 and loaded on a carrier frequency to power line signal combiner When the information signal is received from the power lines L ₁ and L ₂ , the signal is modulated by the frequency shifting unit 230 and demodulated to the logic unit 240.

The modulation and demodulation unit 230 adjusts the resistor R1 and the capacitor C ₁ to change and fix the carrier frequency, and adjusts the capacitor C ₂ to adjust the transmission speed of the information signal.

The logic unit 240 is composed of a processor, a memory, and a peripheral circuit thereof. The logic unit 240 performs an information signal processing with the modulation / demodulation unit 230, the sensor interface unit 250, and the information signal through the terminals according to FIG. Replace it.

The device address generator 241 is a component for allocating a unique address of the device when the device is to be used in a system composed of a plurality of terminal controllers 101-1nn as shown in FIG. ₂ -R ₉ ) and a plurality of switches (SW ₁ -SW ₈ ). Zone address generator 242 is the main controller 10 and the terminal connected to the same power line in a system consisting of a plurality of main controllers (10-1n) and a plurality of terminal controllers (101-1nn) as shown in FIG. Multiple resistors (R ₁₀ -R ₁₃ ) to match the lower 4 bits of the main controller (101-1nn) to ensure communication between controllers (101-1nn) and to prevent communication with other master controllers. And a plurality of switches SW ₉ -SW ₁₂ .

The power supply unit 220 is composed of a circuit for supplying the DC power required by the device from the AC power line and a circuit including a battery for the power failure, and the device includes DC + 5V, DC + 15V, DC Supply + 24V.

3 is described in detail with reference to FIGS. 1 and 2.

In step 300, the second logic unit 240 constantly monitors whether the request information is received from the power lines L ₁ and L ₂ through the power line signal combiner 210 and the modulator 230.

At this time, if the request information is received, the process proceeds to step 301 and monitors and compares whether the address of the lower 4 bits of the area address among the information received in the step 300 matches the area address of the area address generating unit of the apparatus. In this case, if it does not match, the process returns to step 300 and continues with step 300. If the area address matches, the device address of the information received in step 302 is equal to the device address of the device address generator 241 of the device. Monitor and compare matches. If it does not match at this time, the process returns to step 300, and if the two addresses match, the process proceeds to step 303.

In operation 303, the logic unit 240 requests the sensor interface 250 to provide status information of the sensors S ₁ to S _n connected to each terminal of the sensor interface. In step 304, when the sensor S ₁ to S _n state information is detected from the sensor interface unit 250, the process proceeds to step 305.

In operation 305, the logic unit 240 transmits the area address, the device address, and the sensor state information to the power lines L ₁ and L ₂ through the modulation / demodulation unit 230 and the power line signal combiner 210.

In step 306, the response information for the step 305 is monitored and compared with the power line signal combiner 210 and the modulator 230, and when the reception is completed, the process returns to step 300 and waits.

As described above, the present invention can monitor the stable state of various objects by using the power line, and it is unnecessary to change the transmission path when the monitoring object is changed, and it is advantageous to install and operate without having to change the installation position of each terminal. In addition, the asynchronous communication processing is possible regardless of the frequency component of the AC power signal, so that communication is possible even in the case of power failure, and zero detection function is unnecessary, so the configuration circuit is simple.

Claims (1)

An information signal transmission system using power line communication, comprising: power lines (L ₁ , L ₂ ), a logic unit (240) connected to the power lines to perform control processing for signal conversion processing, and assigning a unique address of the device. In order to assign a device address generator 241 consisting of a plurality of resistors (R _2- R ₉ ) and a plurality of switches (SW _1- SW ₈ ), and a region address for limiting the range of power line communication information exchange. Is connected between the region address generator 242 consisting of a resistor (R ₁₀ -R ₁₃ ) and a plurality of switches (SW ₉ -SW ₁₂ ), and power lines (L ₁ , L ₂ ) and the logic unit 240. A resistor R1 for demodulating the analog modulated signal received from the power lines L ₁ and L ₂ into a digital signal or modulating the digital signal generated by the logic unit into an analog signal for transmitting to the power lines L ₁ and L ₂ . ) And a demodulator 230 consisting of a capacitor (C ₁ -C ₂ ) and the like, and the demodulator 23 0) and the power line (coupled transformer (CT1) to be connected between the L _1, L ₂₎ by passing the modulated signals between the modem part 230 and the power line (L _1, L ₂₎ to separate the alternating power signal And a power line signal coupler 210 formed of two capacitors C _{3 and} C ₄ , and the logic unit 240 and the sensors S ₁ -S _n for monitoring various stable states. And a sensor interface unit 250 for transmitting information to the logic unit 240, and a power supply unit 220 for supplying DC power of the device.