JPS58195339A - Signal transmitting device - Google Patents

Abstract

PURPOSE:To improve noise resistance, by receiving the 1st and the 2nd pulses having different synchornizing ''1'' level of front and tail ridges of a transmission signal and extracting a pulse signal within a permissible level range at the reception side. CONSTITUTION:A conversion circuit 11 generates pulses P11, P12 which are in synchornization with the front and tail ridges of the transmission signal P and transmits pulses P100 and P50 of levels 2E and E. When the pulse P100 is received, diodes 403, 503 and 504 having <=EV of the Zener potential are conductive and a bistable multivibrator 600 produces an output. On the other hand, a TR 501 is turned off and no input is given to the bistable multivibrator 600. When the pulse P50 is received, it pases through the Zener diode 503 only, a TR 502 only is turned on and the output of the bistable multivibrator 600 disapperars. Thus, a signal P is extracted from the bistable multivibrator 600. When the reception pulse is higher than the Zener diode of the diode 404, the bistable multivibrator 600 produces no output. When the reception pulse is lower in level than the Zener potential of the diode 504, all the Zener diodes are cut off.

Description

[Detailed description of the invention] This disclosure relates to a signal transmission device for pulse signals.

The first factor is a conventional example of this Yuzu signal transmission device. In the figure, reference numeral 10 indicates an output pulse P of a switching device (transistor) 11 that performs a switching operation in response to the level of a signal P to be transmitted. The transmission line 20
Send to. 12.13 is a current limiting resistor, and E is the voltage of the m dynamic power source. 30, the input circuit of the switching element 31 receives the blade pulse P+n through a filter consisting of a resistor 32 and a capacitor 33, and the switching element 31
The received output Pill is taken out from the collector. 34.
35 is a first-class limiting resistor, and X is a connection point between the input circuit and the filter.

In this configuration, a filter is installed in the input circuit of the receiver@14113G to prevent noise from entering from the transmission line 20.
However, if the time constant of the filter of resistor 32 and capacitor 33 is small, there is a risk that the potential at the connection point Calculated by the gradual rise in potential at point C! Ranjistaro 1 turns on and receives 911tl
There is a drawback that the force Ps is incorrect. Of course, by increasing the time constant of the filter, this problem can be alleviated, but there is also the drawback that the conduction of the 91-pin becomes slower. Also, for AK which improves noise resistance, it is possible to increase the transmission energy, but this is not preferable from the economic point of view.

The present invention eliminates the above-mentioned disadvantages of the prior art.The present invention sends the second pulse to the receiver gIIUn, and checks whether both pulses are within a preset tolerance level range for each pulse at each reception -j. JIA that detects ≧ and is within the ℃ tolerance level cape
By driving the base pulse generation circuit and extracting the pulse No. 1d, it has better noise resistance than conventional fi! IFJ personality is 4<, n[noyo,'□.

The purpose of the present invention is to provide a signal transmission system that can transmit signals by having a fg 'f5 transmission.

An embodiment of this xA light will now be described with reference to the drawings.

In FIG. 2, reference numeral 101 denotes a transmission l111 variable circuit, which generates a narrow pulse pH synchronized with the curved edge of the signal P and a narrow pulse p1t synchronized with the trailing edge of the signal P. ! 11
00 to receive the pulse pH and pH.

102 and 103 are transistors which are switching elements, and pulse pH and Pll are input to each pace. 104 is a fg IIll pulse pressure regulator, in which the collector of the transistor 02 is connected to the intermediate point C of the second winding 105, and the collector of the transistor 03 is connected to the end of the winding 11 (the first end of the winding). 8 and
Transistors 02 and 103 respectively pulse pH and P
, the first pulse PI0 of level 2E
6 and the second pulse P of level E, the secondary winding Iwi
! 106 to the transmission line 200. .

,' 300 is received! ! A side pulse transformer, the transmission line 200
Connected to, 1 primary volume #3o1 and 2. The unit has primary windings 30L and 30B. 400 is the first level test path which receives human power from the secondary winding leg 302;
0 is the second level configuration 1 that receives input from secondary volume #1303! fil! i! r, 601~:1 multi),
)@l level detection circuit w6400 is transistor 401
A constant voltage diode 403 and an input resistor 405 are inserted in one path of the base of the transistor 4010.
A constant voltage diode 404 and an input resistor 406 are inserted into the transistor 4020 pace circuit, and the collector of the transistor 402 is connected to the base of the transistor 401 via the diode 401. , constant voltage diodes 404 and 403 are used to set the upper and lower limit levels of the ff capacitance level range for the first pulse pHl@, respectively.For example, for E=100 volts, 110 volts and 9 It has a Zener potential of .0 volts. The collector output of the transistor 402 is input to the set terminal S of the °C bistable multi 600 via an inverter 40B for polarity inversion. '@20 level detection Oki 1 path 500, 501 and 502 are transistors, 503 and 504 are constant"wlL ratio diodes,
505 and 506 are input resistors, 50 is a diode, 5
08 is an inverter.

Constant voltage diodes 503 and 504 @2 pulse PI (+
This is for setting the upper limit level and lower limit level of the tolerance level axis 1, respectively.As mentioned above, if the voltage is E-100 volts, for example, the Zener potentials are set to 60 volts and 40 volts, respectively. The collector output of the transistor 502 is input to the reset terminal R of the pulse generation circuit (Hiroshi Soyasu multi) 6θ0.

Next, the operation of this @ position will be explained.

Suppose now that the voltage E is 100 volts. 1st pulse P
, . Therefore, the transistor 401 is turned on and the bistable multi 600 outputs. On the other hand, the pace current that attempts to flow into the transistors 501&C flows through the diode 501 to the transistors 501 and 501.
01 is turned off and is not input to the reset terminal R of the bistable malte 600.

Subsequently, when the second pulse P, 0 reaches the receiving side, the constant voltage diode 5 whose Zener potential is 50 volts or less
03 but other constant voltage diodes 403.404
．． 504 is blocked. For this reason, the transistor 50
Only 2 is turned on, and the reset terminal R of the bistable multi 600
Since the output of the transistor 502 is input to the input signal, the output of the bistable multi 600 is turned off. (Thus, the m number P is taken out from the bistable multi 600.

If the pulse that has arrived at the receiver 4M'11111 is lower than the Zener potential of the constant voltage diode 404, the current that is about to flow to the base of the transistor 401 is
Since the current flows to the transistor 402 via the transistor 01, the transistor 401 is off, the bistable multi 600 does not output. A level lower than the Zener potential of the constant voltage diode 504β, 1. Luz received 1
ll K51J rice has all foot voltages,',
, diode 403404.503.504#, C71
Q cuff? ♀:'1'15. 401.402
．． 501 and 502 are not turned on.

As described above, according to the present invention, the first and second pulses having different levels are sent to the receiver mi1+ in synchronization with the leading edge of the signal to be sent and f&41, respectively, and on the receiving side, the input is il and the second pulse. By having a configuration in which the incoming pulse is checked by two level detection (b) paths that output and set/reset the pulse generation circuit when the pulse is within the allowable level range set respectively for the above. Even if a pulse outside the dC allowable motion range arrives at the receiver 18i1111, it will not respond, so there is no need to increase the ph input energy (compared to the conventional method, there is less noise) It is possible to obtain a transmission V device with a very strong No. 91 transmission and a 1!

[Brief explanation of the drawing]

Figure 1 shows the conventional signal transmission-i! Circuit diagram of the device, Figure @2 is a circuit diagram of an embodiment of the signal transmission i* according to the invention. In the figure, 1 G, l, . . . conversion circuit, 102
．． 103...Switching element 1,, ij,. 104°-7<A-2 transformer゛゛; 200...transmission line, 300...pulse transformer,
400...ml level detection circuit, 401, 402... switching element, 403.4
04... Constant voltage diode, 500... Second level detection circuit, 501.502... Switching element, 503.50
4... Constant voltage diode 600... @ for the double multi-pulse helmet regeneration. In addition, the same reference numerals in the circular indicate the same or equivalent parts.

Claims (1)

[Claims] A conversion (b) path for sending out a first pulse having a first level and a second pulse having a second level synchronized with the curved edge and trailing edge of the m number to be transmitted, respectively, to the transmission path; a first level detection circuit and a second level detection circuit that receive both the first and second pulses; a pulse that is reset by the output of the first level detection circuit and the second level detection circuit, respectively; a generating circuit, the first level detection circuit and the second level detection circuit each having a
A signal transmission device characterized by outputting in response to an input that is within a preset tolerance level range for the pulse and within a preset metering level extension for the second pulse.