JPH0313818B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention provides a remote controller in which a plurality of terminals each having a unique address are connected to one central controller via a common signal carrier line. The present invention relates to a control device, and particularly relates to waveform shaping of data waveforms.

(b) Conventional technology In general, conventional remote control devices are
There was something like the one described in the -74047 publication. This publication states that, for example, when sending signals such as address data or control data to a power line, the transmission waveform output from a logic circuit is first modulated by an oscillation circuit, and then passed through a coupling circuit (transformer) to a power line (signal was being sent to the transport line). The terminal device inputs this signal from the power line via a coupling circuit (transformer). This terminal device controlled the operation of the load based on this signal (control data).

(C) Problems to be Solved by the Invention In the conventional device configured as described above, for example, when a signal waveform is output from a logic circuit to an oscillation circuit as shown in a in FIG. The waveform is as shown in FIG. 2b. When the waveform shown in Figure 2b is sent to the power line via the coupling circuit, this waveform is affected by the impedance of the power line and transformer, and becomes the waveform with ringing as shown in Figure 2c. Become. When this waveform is received by the terminal device via the coupling circuit and converted into a signal wave, the waveform becomes the waveform shown by the solid line in d in Figure 2, and the pulse width is different from that in a in Figure 2. It was received and caused a malfunction.

In view of this problem, the present invention provides a device that solves this problem by shaping the waveform.

(d) Means for Solving the Problems The control device of the present invention connects a terminal device to a central controller via a signal carrier line, and controls the terminal device based on control data sent from the central controller. For controlling connected loads, a transformer that connects a central controller and terminal device to a signal carrier line;
It is equipped with a waveform shaping circuit that shortens the pulse width of data received or transmitted via this transformer.

(E) Effect The remote control device configured as described above can suppress malfunctions caused by ringing of signal waveforms caused by the impedance of transformers and signal carrier lines.

(f) Embodiment Below, an embodiment of the present invention will be explained based on the drawings. First, Fig. 1 is an electrical circuit diagram of the main part of the terminal, and 1 in the figure shows the connection between the secondary side and the signal carrier lines 2 and 3. It is a coupling transistor connected via capacitor 4, and one end of the primary side is connected to the positive power supply (+Vcc).
The other end is grounded via an output transistor 5 and a resistor 6 in series. 7 is a logic gate that provides a switching signal to the transistor 5, and an oscillator 8
A modulation operation is performed using the signal from the output waveform shaping circuit 9 as a carrier wave and the waveform of signal data from the output waveform shaping circuit 9 as a modulation wave. This output waveform shaping circuit 9 shapes the waveform of the signal from the microprocessor 10, and includes resistors 11, 12, 13, and a diode 14.
and a capacitor 15. For example, when a rectangular wave of H level voltage is output from the microprocessor 10, when the rectangular wave rises, it becomes an integrating circuit consisting of resistors 12, 13 and capacitor 15, and when the rectangular wave falls, it becomes an integrating circuit consisting of capacitor 15.
is discharged through the diode 14. The output of the waveform shaping circuit 9 is shaped again into a rectangular wave at the threshold level of the input terminal of the logic gate 7. FIG. 3 is a diagram showing changes in the output waveform from the microprocessor 10.
A signal waveform as shown in FIG. 1A is applied to the logic gate 7 via the waveform shaping circuit 9. At this time, the waveform shaped by the threshold level of the input terminal of the logic gate 7 becomes the waveform shown in FIG. 3b. This waveform has a shorter H level width than the waveform shown in FIG. 3a. When the carrier wave from the oscillator 8 is modulated using this waveform as a modulating wave, the waveform shown in FIG. 3c is obtained. This waveform is passed through the transistor 5 and the coupling transformer 1 to the signal carrier lines 2 and 3.
When the signal is sent out, the waveform becomes as shown in FIG. 3d.

In addition, 16 is a demodulation circuit, and the coupling transformer 1
The signals received from the signal carrier lines 2 and 3 are demodulated and output to the reception waveform shaping circuit 17. This reception waveform shaping circuit 17 is composed of resistors 18 and 19, a diode 20, a capacitor 21, and a logic gate 22. For example, H from the demodulation circuit 16
When a rectangular wave of level voltage is output, when the rectangular wave rises, it becomes an integrating circuit consisting of resistors 18, 19 and a capacitor 21, and when the rectangular wave falls, the charge in the capacitor 21 is discharged via the diode 20. This waveform is reshaped into a rectangular wave at the threshold level of the input terminal of the logic gate 22 and then output to the microprocessor 10. This waveform has a shorter H level width than the waveform after double modulation shown in FIG. 2d.

When a modulated wave number as shown in FIG. 2c is received from the signal carrier lines 2 and 3 via the coupling transformer 1,
The demodulation circuit 16 outputs the demodulated waveform shown in FIG. 2d to the waveform shaping circuit 17. This waveform shaping circuit 1
7 shapes this waveform into the waveform shown in FIG. 2e and outputs it to the microprocessor 10.

Note that 23 and 24 are a setting device and a display device, respectively, for determining the address of the terminal device.

In the remote control device configured as described above, since each terminal device is provided with an output waveform shaping circuit and a receiving waveform shaping circuit, the signal waveform sent from the central controller to the signal carrier lines 2 and 3 is , 3 or the coupling transformer 1, the received waveform shaping circuit 17 removes this ringing, and then the microprocessor 10 of the terminal device inputs the signal.

Furthermore, when the terminal device sends out a signal, the ringing caused by the signal carrier lines 2 and 3 and the coupling transformer 1 is predicted in advance, and the waveform of the signal data is shaped by the transmission waveform shaping circuit 9, so that it is received by the central controller. Moreover, the signal waveform after demodulation is free from the influence of ringing.

In the above embodiment, the receiving waveform shaping circuit and the transmitting waveform shaping circuit are provided in the terminal device, but they are not limited to this, and may be provided in a centralized controller, for example.
Further, either the receiving or transmitting waveform shaping circuit may be provided in the terminal device or the central controller. Further, even if a plurality of terminal devices are provided and each terminal device is designated by address data, the same effect can be obtained by providing the above-mentioned waveform shaping circuit.

(G) Effects of the Invention The remote control device of the present invention includes a central controller and a terminal device connected to the controller via a signal carrier line. It is equipped with a transformer that couples the data, and a waveform shaping circuit that shortens the pulse width of the data received or sent out via this transformer, so the signal data is not affected by ringing of the modulated signal caused by the influence of the signal carrier line or the coupling transformer. It can suppress erroneous input, and does not have a ringing correction function such as off-the-shelf ICs in the modulation and demodulation circuits.
Correct control data can be easily obtained even when using an IC.

In addition, if the control data output to the signal carrier line is corrected in advance using a waveform shaping circuit, control data with the correct pulse width will always be obtained even after demodulation, so even when the communication speed of control data is increased, the effects of ringing can be avoided. It is preventable.

[Brief explanation of the drawing]

FIG. 1 is a main electrical circuit of a terminal of a remote control device using an embodiment of the present invention, FIG. 2 is a waveform diagram at each part when the terminal shown in FIG. 1 receives a signal, and FIG. The figure is a waveform diagram at each part when the terminal device shown in FIG. 1 sends out a signal. 1... Coupling transformer, 2, 3... Signal carrier line,
9...Transmission waveform shaping circuit, 17...Reception waveform shaping circuit.

Claims (1)

[Claims] 1. A central controller and a terminal device are connected via a signal carrier line, and the central controller modulates control data represented by a combination of a plurality of pulses having a predetermined width at a predetermined frequency. A remote control is configured to output the signal to the carrier line via the rear transformer, and the terminal device controls the operation of the load based on control data obtained by demodulating the signal received from the carrier line via the transformer. In equipment, when control data is transmitted to a terminal device via a carrier line, control is performed to output it to the signal carrier line so as to almost cancel out the spread of the pulse width determined by the characteristics of the signal carrier line, transformer, modulation frequency, etc. A remote control device comprising a waveform shaping circuit that shortens the pulse width of data or the pulse width of control data obtained from a signal carrier line.