JPH042512Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a highly reliable dual-system transmitting device used for transmitting railway vehicle detection signals and the like.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional example, in which a first transmitter (hereinafter referred to as TX ₁ ) 1 and a second transmitter (hereinafter referred to as TX ₂ ) 2 are provided, and a signal given from an input IN is provided. Each amplifies and transmits output OUT
TX ₁ ,
1, TX ₂ , and 2 each have an internal failure detection circuit (hereinafter referred to as TDT) that detects a drop in the transmission level, and when these are judged to be in a normal state, relays COR and SKR are all activated. It is driven and operational.

Therefore, when TX ₁ , 1, TX ₂ , 2 are all normal, relay COR contacts COR ₁ , COR ₂
As a result, the output of TX ₁ , 1 is connected to the pseudo load resistor.
It is disconnected from R _L1 and connected to the transmitter output OUT, while the output of TX _2,2 is connected by contact COR ₃ to a similar resistor R _L2 , so that the output from TX _1,1 is connected to the transmitter output OUT. TX ₂ and 2 are in a standby state.

In addition, TX ₂ , 2 is equipped with an attenuator (hereinafter referred to as ATT) on the internal input side, and in response to the supply of power B by turning on contact COR ₄ , the internal relay operates and the ATT is inserted. and by this
The output level of TX ₂ , 2 is lowered to reduce the power consumption of the power supply and the power applied to the resistor R _L2 .

Regarding the above, if TX ₁ and 1 fail, the relay
COR is restored, the outputs of TX ₁ , 1 are terminated by resistor R _L1 , the outputs of TX ₂ , 2 are connected to the transmission output OUT, and the internal ATT is in a bypass state, and TX ₂ , The output level of No. 2 becomes a normal value, and this output is sent out as a transmission signal.

In addition, if only TX ₂ , 2 fails, TX ₁ ,
Transmission from 1 is performed, relay SKR is restored,
Alarms are sent through contacts not shown in the figure.

Additionally, if both TX ₁ , 1 and TX ₂ , 2 fail, TX ₂ ,
The output of 2 is connected to the transmission output OUT, and
An alarm is sent out in the same manner as described above.

Note that even when the relay COR is restored, an alarm is sent out through contacts not shown in the diagram.

[Problem that the invention attempts to solve]

However, in the configuration shown in Figure 2, TX ₁ , 1
If the resistor fails, the output level has not been lowered, and the power consumption is surplus, and the power applied to the resistor R _L1 is large, so a large resistor must be used. , causing uneconomical problems.

In addition, when the frequency of each transmitted signal changes, the reception status becomes abnormal, so it is necessary to add a function to detect changes in the transmission frequency to the TDT.
In this case, even if the transmission level is normal, the relay COR is restored according to the detection of frequency shift,
By connecting the output of TX _1,1 to the resistor R _L1 , a problem arises in which the aforementioned diseconomies are further increased.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, in the above-mentioned device, there is an attenuator provided on the input side of the first transmitter, and this attenuator is in a bypass state when the first transmitter is normal, and when the first transmitter is malfunctioning. It is equipped with a relay that is sometimes inserted, and a failure detection circuit provided in each of the first and second transmitters to detect a drop in the transmission level and detect a change in the transmission frequency.

[Effect]

Therefore, the failure detection circuit can detect a change in the transmission frequency, and if the relay COR is restored due to this detection, the output level of the first transmitter will also decrease due to the insertion of an attenuator, and the power consumption and The power applied to resistor R _L1 decreases.

〔Example〕

The details of the present invention will be explained below with reference to the block diagram of FIG. 1 showing an embodiment.

In the same figure, TX _1,1 and TX _2,2
ATTs 11 and 21 are provided on the internal input sides of each, and amplifiers (hereinafter referred to as A) 12 and 22 are provided, and contacts 1 of relays 1CORPR and 2CORPR are provided on the input and output sides of ATTs 11 and 21.
CORPR ₁ , 1 CORPR ₂ and 2 CORPR ₁ , 2
CORPR ₂ is inserted into each, and these operations insert ATT11 and ATT21 into each input of A12 and A22, and by these restorations, ATT11 and ATT21 are inserted into each input.
1 will be bypassed.

In addition, TX ₁ , 1 and TX ₂ , 2 each have
TDT13, 23 are provided, these are A1
2. In addition to detecting a drop in the transmission level of A22, the displacement of the transmission frequency is also detected, and when either one is detected, a failure is detected and the relays COR and SKR are restored.

Note that the relay 1 CORPR is supplied with power B through a contact COR ₅ , and the rest is the same as in FIG. 2.

Therefore, when TX _1,1 or TX _2,2 has a failure, or both have failed, the transmission output OUT and TX _1,1 , TX ₂ ,
2, if TX _1,1 is normal, then from TX _1,1 , if this causes a failure.
Transmission is performed from TX _2,2 .

However, while TX ₂ and 2 are in the standby state, ATT21 is inserted by the operation of relay 2CORPR,
While the output level of TX ₂ , 2 decreases, the output level of TX1 ₁ ,
In response to the restoration of relay COR due to the failure of relay 1, relay 2 CORPR was also restored and ATT21 was diverted,
In addition to the output level of TX ₂ , 2 becoming the normal value, in TX ₁ , 1, while this is normal, recovery contact COR ₅ is turned off due to the operation of relay COR, and relay 1 CORPR is restored. ATT1
1 is in the bypass state, and the output level of TX ₁ , 1 is set to the normal value. However, when relay COR is restored due to a failure of TX ₁ , 1, relay 1 CORPR operates in response to contact COR ₅ turning on. , ATT11
is in the inserted state.

Therefore, if the transmission level of TX _1,1 decreases or the transmission frequency shifts, the output level will further decrease, and the power consumption of TX _1,1 and the power applied to resistor R _L1 will decrease. It becomes possible to use a small-sized device for this purpose, which improves economic efficiency, and also allows frequency monitoring of transmitted signals to be carried out without any problem.

Incidentally, the frequency shift detection of the TDT 13 can be easily performed by providing a bandpass filter, an amplification detector, etc. according to a single frequency component or a plurality of frequency components of a predetermined transmission signal.

In addition, the frequency shift of the transmitted signal may be caused by an abnormality in the signal generator connected to the input IN, or by A12, 2
This is based on the severe deterioration of linearity of 2.
The TDTs 13 and 23 can also detect abnormalities in the signal generator.

However, the configurations of TX ₁ , 1 and TX ₂ , 2 can be arbitrarily selected depending on the situation, and various modifications are possible.

[Effect of idea]

As is clear from the above explanation, according to the present invention, it is possible to detect changes in the transmission frequency, and in the event of a failure of TX ₁ , 1 including this, the power consumption of the power supply and the power applied to the resistor are reduced, and the resistance Since the device can be easily miniaturized and the overall economical efficiency is improved, great effects can be obtained in duplex transmitting devices for various uses that require high reliability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 1...TX ₁ (first transmitter), 2...TX ₂ (second transmitter)
transmitter), 11, 21...ATT (attenuator), 1
2, 22...A (amplifier), 13, 23...TDT
(Failure detection circuit), IN...Input, OUT...Transmission output, COR, 1CORPR, 2CORPR, SKR...Relay.

Claims (1)

[Scope of utility model registration request] a first transmitter having a failure detection circuit; and a second transmitter having an attenuator provided on the failure detection circuit and the input side; the attenuator is inserted when the second transmitter is on standby; state, and when the first transmitter fails, the transmission output is switched from the first transmitter to the second transmitter in response to detection by the failure detection circuit, and the attenuator of the second transmitter is switched. In a dual transmitting device that is put into a bypass state, an attenuator provided on the input side of the first transmitter, and an attenuator that puts the attenuator into a bypass state when the first transmitter is normal and which The transmitter includes a relay that is inserted into the inserted state when a transmitter malfunctions, and the failure detection circuit that is provided to each of the first and second transmitters and detects a decrease in the transmission level and detects a change in the transmission frequency. A dual system transmitter featuring: