JP4464733B2 - Transmission system - Google Patents

Description

  The present invention relates to a transmission system having a standby system in an active system, and more particularly to a transmission system suitable for relaying a signal between a broadcasting studio and a transmitting station.

  A transmission system called an STL (studio to transmitter) device is sometimes used to relay signals between a broadcasting studio and a transmitting station. This STL device usually requires continuous operation all the time. In addition, since it is often operated as an unattended system, high reliability and survivability are required.

  Therefore, this STL device has conventionally been provided with a double transmission system of an active system and a standby system, and is automatically switched to the other transmission system when an abnormality occurs in one transmission system. An example of such a duplex transmission system will be described with reference to FIG.

  In the transmission system of FIG. 5, the transmission side relay unit T and the reception side relay unit R are configured to be connected by a wired or wireless transmission system L. At this time, the transmission side relay unit T The modulation unit and the transmission unit are a duplex system of the active modulation unit 1-1 and the transmission unit 2-1, and the backup modulation unit 1-2 and the transmission unit 2-2. It is assumed that the system receiving unit 5-1 and demodulating unit 6-1 and the standby system receiving unit 5-2 and demodulating unit 6-2 are duplex.

  Then, the transmission side relay unit T is provided with a transmission switching unit 3, which selects the transmission signal Ia for the active system and the transmission signal Ib for the standby system, switches one transmission signal to the output Out and sends it to the transmission system L. In addition, the receiving side relay unit R distributes the transmission signal relayed in the transmission system L to the active system and the standby system by the distributor 4, and then provides the reception switching unit 7 to provide the received signal input Ts 1 for the active system. And the standby reception signal input Ts2 are selected, and one of the reception signals is switched to the output Tso.

  At this time, first, the transmission switching unit 3 takes in the alarm information at1, am1, bt2, and bm2 from the modulation units 1-1 and 1-2 and the transmission units 2-1 and 2-2, respectively, and thereby The soundness of each of the standby system and the standby system is monitored, and the active system and the standby system are automatically switched according to the occurrence of an abnormality so that a transmission system having no abnormality is selected.

  The reception switching unit 7 takes in alarm information ad1, ar1, bd2, br2 from each of the receiving units 5-1, 5-2 and the demodulating units 6-1, 6-2. Each soundness is monitored, and the active system and the standby system are automatically switched according to the occurrence of an abnormality, so that a healthy transmission system having no abnormality is selected.

  Here, the alarm information means that in the transmission switching unit 3, when an abnormality occurs in each of the modulation units 1-1 and 1-2 and the transmission units 2-1 and 2-2, In the reception switching unit 7, when an abnormality occurs in each of the receiving units 5-1, 5-2 and the demodulating units 6-1, 6-2, a signal is generated from the monitor unit provided in each. It is a signal that is generated.

  By the way, in the case of the duplex transmission system described with reference to FIG. 5, the transmission switching unit 3 in the transmission side relay unit T and the reception switching unit 7 in the reception side relay unit R are both configured in a duplex system. Therefore, if a failure occurs in these parts, for example, the power source of the transmission switching unit 3 or the reception switching unit 7 is broken, the signal transmission is interrupted and no output can be performed. There is a risk of becoming.

  Therefore, a so-called bypass method shown in FIG. 6 is known as a conventional technique for backing up the failure of the transmission switching unit 3 and the reception switching unit 7. Here, since the distributor 7 of the receiving side relay unit R has a relatively simple circuit configuration and does not include an active element, it is usually not particularly necessary to use a duplex system in consideration of occurrence of an abnormality. Is.

  FIG. 6 shows an example of the case where the above-described bypass method is applied to the reception switching unit 7 in FIG. 5. In this case, as shown in the figure, between the active system received signal input Ts 1 and the output Tso. In addition, a bypass circuit including two relays (electromagnetic relays) 10 and 11 is provided.

  Needless to say, the transmission switching unit 3 must be applied in practice.

  Each of the relays 10 and 11 includes a so-called switching contact type electromagnetic relay provided with make contacts 10a and 11a, break contacts 10b and 11b, movable contacts 10c and 11c, and electromagnetic coils 10d and 11d.

First, the output of the working demodulator 6-1 is supplied to the movable contact 10c of the relay 10, and the output of the reception side relay unit R is taken out from the movable contact 11c of the relay 11.

  Next, the make contact 10a of the relay 10 is connected to the active reception signal input Ts1 of the reception side switching unit 7, and the output Tso of the reception side switching unit 7 is connected to the make contact 11a of the relay 11 and the relay 10 The break contact 10b is directly connected to the break contact 11c of the relay 11 by a bypass line.

Here, the make contact is generally referred to as a contact, which is a contact that is closed when the electromagnetic coil is energized and the relay operates, and is also called a normally open ( NO ) contact. In FIG. 6, it is drawn with a circle painted with light ink.

Next, the break contact is generally called a b contact, and is a contact that is closed when the electromagnetic coil is not energized, that is, when it is not operating, and is opened when the electromagnetic coil is energized and the relay operates. Furthermore, it is also called a normally closed ( NC ) contact, and in FIG. 6, it is drawn with a white circle.

Next, the operation of the circuit of FIG. 6 will be described. First, the relays 10 and 11 operate when the power supply voltage V _cc is applied to the respective coils (electromagnetic coils) 10d and 11d, and have been closed until then. The break contacts 10b and 11b are opened, and at the same time, the make contacts 10a and 11a that have been opened are closed.

At this time, although not shown, the voltage V _cc is supplied from the same power source as the operating voltage supplied to the reception switching unit 7, where the voltage value of the voltage V _cc is the rating of each relay 10, 11. It is equal to the voltage, for example, 12V (volt), and therefore, this is the make voltage.

Here, when the power supply voltage necessary for the operation of the reception switching unit 7 is secured and the reception switching unit 7 is operating normally, the power supply voltage _{Vcc of} 12 V, for example, is also supplied to the bypass system. Therefore, the relays 10 and 11 operate correctly, the make contacts 10a and 11a are closed, and the break contacts 10b and 11b are open.

7 is a time chart for explaining the operation in this case, now, at time t ₀ when the power supply to the system is turned on, as shown in (a) of FIG. 7, the relay 10 in the time t ₀ , the voltage V _cc of the 11 becomes 12V, they operate, make contact 10a, 11a is closed, the break contacts 10b, 11b is opened.

  In the following description, the term “time” may be used together with “time point”, but both have the same meaning.

  Therefore, at this time, the output of the working demodulator 6-1 is supplied to the input Ts1 of the reception switching unit 7 through the make contact 10a of the closed relay 10, and the output Tso of the reception switching unit 7 is It is supplied to the make contact 11a of the closed relay 11, and is taken out as the output Tso of the receiving side relay section R.

Then, as shown in FIG. 7B, the state at this time is represented as “via the reception switching unit”. Therefore, the state before the time t ₀ is in the “bypass” state. However, at this time, the system itself is not operating, so there is no particular meaning.

On the other hand, if the power supply voltage necessary for the operation of the reception switching unit 7 is interrupted and the operation of the reception switching unit 7 becomes abnormal, the power is supplied to the electromagnetic coils 10d and 11d of the relays 10 and 11 at the same time. Since the voltage _{Vcc is} also interrupted, the relays 10 and 11 are restored here, and the switching contacts 10c and 11c are switched to the break contacts 10b and 11b.

This time is time t ₁ in FIG. 7. Therefore, after this time t ₁ , the system switches to the “bypass” state, as shown in FIG. 7 (b). The output of the demodulator 6-1 is supplied from the break contact 10b to the break contact 11b through the bypass line.

  As a result, the input Ts 1 and the output Tso of the reception switching unit 7 are bypassed, and the output of the active demodulating unit 6-1 remains as it is regardless of the situation of the reception switching unit 7. It will be taken out as output Tso.

  As a result, even if the reception switching unit 7 breaks down, it is possible to continue relaying the active signal and avoid the possibility of a serious situation in which no output can be performed. .

  In the above prior art, it cannot be said that the bypass system is the last means for ensuring reliability and survivability, and the bypass system includes a relay (electromagnetic relay) contact. There was a problem.

  Unless otherwise specified, the relay generally has the characteristic that organic gas is generated from the electromagnetic coil due to an increase in temperature. However, this gas has an adverse effect on the relay contact, promotes oxidation, and contacts the contact. Increases resistance and eventually leads to poor contact.

  In this case, even if the system is switched to the bypass system, the bypass function is not given, so that the signal can be transmitted also by the last means for ensuring reliability and survivability, that is, the so-called last fortification. It will disappear.

  An object of the present invention is to provide a transmission system in which high reliability and survivability can be obtained even by a bypass system using an electromagnetic relay.

The object is to provide a first electromagnetic relay in which a break contact is connected to an input of a working system of a switching processing unit that selects a signal transmission path as an active system and a standby system, and a break contact to an output of the working system of the switching processing unit. Connected to the second electromagnetic relay, a make contact of the first electromagnetic relay, and a bypass line connecting the make contact of the second electromagnetic relay, and the signal transmission path to the first electromagnetic relay The switch is connected to the movable contact of the electromagnetic relay, and the signal of the switching processing unit is extracted from the movable contact of the second electromagnetic relay, and the operating voltage value of the first and second electromagnetic relays is set to the make voltage value. From the make voltage value to the holding voltage value when a preset time has elapsed after the start of energization of the operating current to the electromagnetic relay. In the transmission system configured to switch, the variable control unit, the holding voltage of the electromagnetic relay, go stepwise decreasing the make voltage value of the electromagnetic relay as the initial value, when the electromagnetic relay is returned, This is achieved by storing the voltage of the previous stage in a memory and controlling the electromagnetic relay using the voltage stored in the memory as a new holding voltage of the electromagnetic relay .

At this time, the above-described object can be achieved even if the storage operation of the holding voltage in the memory by the variable control unit is started by an alarm function provided in the switching processing unit .

  According to the present invention, since the amount of heat generated by the electromagnetic coil of the electromagnetic relay can be reduced, it is possible to suppress the generation of organic gas accompanying a temperature rise, to suppress the decrease in reliability and viability due to the deterioration of the contact, and The power consumption of the electromagnetic coil is also reduced, which is advantageous for energy saving.

  Hereinafter, a transmission system according to the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 shows a transmission system according to an embodiment of the present invention. In FIG. 1, reference numeral 20 denotes a variable control unit, and a voltage (V _R ) output therefrom is a power source for relays (electromagnetic relays) 10 and 11. The voltage, that is, the relay voltage V _R is supplied, but the configuration other than these is the same as that of the transmission system according to the prior art described with reference to FIG.

  Needless to say, this embodiment also applies to the transmission switching unit 3 in practice.

First, the variable control unit 20 constitutes control means for switching the operating voltage value of the relay from the make voltage value of the electromagnetic relay to the holding voltage value, and the power supply voltage V _cc (= 12 V) supplied to the reception switching unit 7. ) To generate a relay voltage V _R to be supplied to each of the relays 10 and 11, and for this purpose, it is composed of a timer 21, a switch 22, and a resistor 23.

First, as shown in FIG. 2B, the timer 21 starts a time measuring operation at the rising time t ₀ of the power supply voltage V _cc , and after a preset delay time T _D has elapsed, the timer signal τ 2 and is supplied to the switch 22. Next, as shown in FIG. 2 (c), the switch 22 is closed when the timer signal τ is not inputted, and the timer signal τ is inputted. Then, it closes and works to short-circuit the resistor 23.

Then, the resistor 23 is inserted between the power supply voltage V _R of the power supply voltage Vcc and each relay 10 and 11, the coil 10d of the relay 10, 11, to generate a voltage drop when a current flows through the 11d, the power supply The voltage _Vcc is reduced to a predetermined voltage _TD (described later).

Thus, in this embodiment, as shown in FIG. 2 (d), the power supply voltage Vcc (= 12V) time t ₀ has risen, the relay voltage V _R is equal to the supply voltage V _cc, the relay voltage V _R Is reduced to a voltage V _TD such as 7 V, for example, lower than the power supply voltage V _{cc of} 12 V after the time t _DR when the timer signal τ is generated.

At this time, the relays 10 and 11 operate when the power supply voltage V _cc rises to 12 V at time t ₀ , so that the operation of the system is started from the “bypass” state as shown in FIG. The state is switched to “via the reception switching unit”.

However, after the time t _TD when the timer signal τ is generated, after the relay voltage V _R is lowered to the voltage V _TD , the relays 10 and 11 are not restored and the make contacts 10a and 11a are closed. Will hold the state. This reason will be described later.

Therefore, also in this embodiment, from time t ₀ to time t ₁ , the output of the active demodulator 6-1 passes through the make contact 10a of the relay 10 that is closed, and the reception switching unit. 7, the output Tso of the reception switching unit 7 is supplied to the make contact 11a of the closed relay 11, and is taken out as the output Tso of the reception side relay unit R.

At time t ₁ , if the power supply voltage necessary for the operation of the reception switching unit 7 is interrupted and, as a result, the operation of the reception switching unit 7 becomes abnormal, at the same time, the coils 10d and 11d of the relays 10 and 11 are connected. Since the applied voltage _Vcc is also interrupted, the relays 10 and 11 are restored here, and the switching contacts 10c and 11c are switched to the break contacts 10b and 11b.

Therefore, after this time t ₁ , the system is switched to the “bypass” state as shown in FIG. 2 (e). At this time, the output of the demodulating unit 6-1 of the active system is bypassed from the break contact 10b. Then, it is supplied to the break contact 11b.

  As a result, the input Ts 1 and the output Tso of the reception switching unit 7 are bypassed, and the output of the active demodulating unit 6-1 remains as it is regardless of the situation of the reception switching unit 7. It will be taken out as output Tso.

  Therefore, even in this embodiment, even in the worst case, even if the reception switching unit 7 breaks down, it is possible to continue relaying the active signal and avoid the possibility of a serious situation where no output can be performed. Can be made.

Next, this embodiment, as shown in FIG. 2, in particular FIG. (D), as also control the relay voltage V _R, as in the prior art described in FIG. 6, the receiving switching unit 7 fails The reason why the relay of the current system signal can be continued and the reason why the object of the present invention can be achieved thereby will be described.

  Here, the characteristics of the relay (electromagnetic relay) necessary to understand the above reason will be explained. It is necessary to pass a current through the coil for the operation of the relay, but the voltage necessary for flowing this current Two types of voltages can be defined: a make voltage value and a holding voltage value.

And first, the make voltage value is a voltage value necessary for energizing the relay to switch the contact, and then the holding voltage value is once energized to the relay and switching the contact, It is a voltage value for enabling the relay to remain in its state without being restored, and here the voltage V _TD corresponds to it. Therefore, hereinafter, this voltage V _TD will be referred to as holding voltage V _TD .

  A general electromagnetic relay, also called a relay, is a type of circuit switching device that opens and closes contacts by moving a movable iron piece (movable iron core) called an amateur by the action of an electromagnet. It is.

  For this reason, when energization of the coil is started, since the movable iron piece is away from the electromagnet, a strong electromagnetic force is required to start attracting it, but once the movable iron core is attracted to the electromagnet, Since the force only needs to resist the return spring, no electromagnetic force is required, and therefore, the holding voltage value is considerably smaller than the make voltage value.

More specifically, assuming that a voltage required for passing a rated operating current value is 12 V in a certain relay, the holding voltage (voltage V _TD ) may be as low as 7 V, for example.

Therefore, if such a relay is used as the relays 10 and 11 in the embodiment shown in FIG. 1, the voltage V _cc of 12 V is temporarily applied at time t ₀ as shown in (d) of FIG. After being applied as V _R , even if the holding voltage V _TD is reduced to 7 V at time t _DR , these relays 10 and 11 can keep operating as they are.

Therefore, according to the embodiment of FIG. 1, as shown in FIG. 2 (e), the state can be maintained “via the reception switching unit” from time t ₀ to time t ₁ . As a result, it is possible to obtain an accurate selection between the “via reception switching unit” state and the “bypass” state.

Next, even in the case of a relay coil, it is inevitable that a resistance is present in the winding. Therefore, if energized, the occurrence of resistance loss is inevitable, and the magnitude of the loss is the square of the value of the energized current. Since (I ² R) works, if the current value can be suppressed, the amount of heat generated by the coil can be greatly suppressed.

At this time, according to the embodiment of FIG. 1, as described above, the holding voltage V _{TD of} 7 V is set after the time t _DR , and as a result, the current value to be energized is reduced. The amount of heat generated by the coils 10d and 11d is greatly suppressed, and as a result, the temperature rise is also suppressed.

  As already explained, the relay generates organic gas from the coil due to the temperature rise, promotes oxidation of the relay contact and increases the contact resistance of the contact, and eventually leads to contact failure. The amount of organic gas generated depends on the temperature of the coil, and the amount of organic gas generated can be reduced if the temperature is suppressed.

Moreover, in the embodiment of FIG. 1, the time from time t ₀ to time t _DR is compared with the time from time t ₀ to time t ₁ shown in FIGS. 2 (b), 2 (c), and (d). (Delay time T _D ) is quite short.

Here, although not yet described for this delay time T _D is determined by the operation time of each relay 10, 11, because only these operation time may be secured, it is set to a relatively short time it can.

In the case of a general relay, this operation time is about 1 second at the longest, and is usually several hundred milliseconds or less. Therefore, the time from time t ₀ to time t _DR is also about this time.

On the other hand, the time from time t ₀ to time t ₁ is the time from when the system operation is started and the relay operation is started until the power supply voltage is interrupted and the operation of the reception switching unit 7 becomes abnormal. although it depends on the reliability specifications of the system, from the fact that all the time continuous operation is required, in fact, not an exaggeration to say that is almost infinite, most energized by the holding voltage V _TD It has become.

  Therefore, according to the embodiment of FIG. 1, the amount of heat generated by the coils 10d and 11d of the relays 10 and 11 can be reduced and the temperature rise is reduced, so that deterioration of the relay contacts due to the generation of organic gas is suppressed. Therefore, it is possible to provide a highly reliable and viable transmission system.

  As a result, according to the embodiment of FIG. 1, the power consumption by the coil of the relay is reduced, so that energy saving is obtained.

By the way, the voltage necessary for passing the holding current value in the above embodiment, that is, the holding voltage V _TD needs to be determined according to the characteristics of the relays used as the relays 10 and 11.

  However, since the characteristics of such relays are somewhat different due to differences in production lots and changes over time, even for the same type of relay of the same type, it is necessary to measure each of the relays in advance. .

Therefore, an embodiment of the present invention in which the holding voltage V _TD is automatically set according to the relay being used will be described with reference to FIG.

In the embodiment of FIG. 3, the holding voltage V _TD is gradually decreased from the initial value step by step, and when the relay 10 is restored, the voltage one step before is stored in the memory as a new holding voltage V _TD. By doing so, the holding voltage V _TD can be automatically set.

Thereafter, the voltage stored in the memory is used as the holding voltage V _TD until the holding voltage V _TD needs to be updated. Here, in the embodiment of FIG. 3, the return of the relay 10 described above is used. In order to detect this, the NG signal generated by the reception switching unit 7 is used.

  Therefore, in the embodiment shown in FIG. 3, in addition to the timer 21 and the switch 22, a GEN (initial value generating unit) 25, a memory 26, DA (digital / analog converting units) 27 and 28, and a SEL (selector) are also provided. A variable control unit 20 </ b> A configured by 29 is used.

Then, the variable control unit 20A operates by switching between the normal operation mode NM and the holding voltage setting mode MM by the mode signal M, and automatically sets the holding voltage V _TD when the holding voltage setting mode MM is set. When the mode NM is selected, the same operation as in the embodiment of FIG. 1 is performed.

Therefore, first, GEN25, when it is in the holding voltage setting mode MM, starts operation at the rise of the power supply voltage V _cc, a predetermined time interval, e.g., every two seconds, equal to 12V of voltage in _the power supply voltage V _cc As an initial value, for example, a voltage that decreases stepwise sequentially at a predetermined voltage such as 1 V is generated as digital data.

  Similarly, the memory 26 sequentially stores the digital data output from the GEN 25 at least two data before and after, and when the NG signal is input from the reception switching unit 7, It works to hold the previous data of the two data.

At this time, the DA 27 functions to convert the digital data output from the _GEN 25 into a voltage A _GEN based on an analog signal, and the DA 28 functions to convert the digital data output from the memory 26 into a voltage A _ME based on an analog signal. To do.

On the other hand, the SEL 29 selects the voltage A _GEN output from the DA 27 and supplies it to the switch 22 in the holding voltage setting mode MM, and selects the voltage A _ME output from the DA 28 in the normal operation mode NM. To supply to the switch 22.

  Next, the operation of the embodiment of FIG. 3 will be described for each mode.

In the normal operating mode NM when the-normal operating mode NM, is set to a state that selects the voltage A _ME that SEL29 are output from the DA28.

As a result, as described above, the basic operation is the same as that of the embodiment of FIG. 1, but at this time, in the embodiment of FIG. 1, the holding voltage V _TD is generated by the voltage drop of the resistor 23. 3 is different from the embodiment shown in FIG. 3 in that the voltage stored in advance as digital data in the memory 26 is selected by the SEL 29 and supplied to the switch 22. There is only.

Therefore, in the embodiment of FIG. 3 as well, in the same way as in the embodiment of FIG. 1 shown in FIG. 2D, at the time t ₀ when the power supply voltage V _cc (= 12 V) rises, the relay voltage V _R becomes the power supply voltage. equal to the voltage V _cc, which is is the make-voltage value, the relay voltage V _R is after the time t _DR timer signal τ is generated, the holding voltage V _TD (e.g. 7V which is stored in the memory 26 in advance the automatic setting Voltage).

  As a result, also according to the embodiment of FIG. 3, the amount of heat generated by the coils 10d and 11d of the relays 10 and 11 can be reduced and the temperature rise is reduced. It is possible to provide a transmission system that is suppressed and has high reliability and survivability.

In the holding voltage setting mode MM In the holding voltage setting mode MM, the SEL 29 selects the voltage A _GEN output from the DA 27, and the switch 22 is set to the state in which the output of the SEL 29 is selected.

Also at this time, the rising time t _{0 of the} power supply voltage V _cc (= 12 V) shown in FIG. 4A is the trigger for starting the operation, so the GEN 25 starts to operate first.

As a result, as shown in FIG. 4A, the voltage A _GEN is generated from the DA 27 that gradually decreases stepwise with the power supply voltage V _cc as an initial value. The step voltage at this time is, for example, 1 V, and the step cycle is, for example, 2 seconds.

Here, this voltage A _GEN is supplied to each of the relays 10 and 11 as a relay voltage V _R. Therefore, these relays also operate at time t ₀ , and the make contacts 10 a and 11 a are closed. As a result, the output of the demodulator 6-1 is input to the reception switching unit 7.

Thus, when the voltage A _GEN decreases with the _passage of time from the time point t ₀ and the relay voltage V _R decreases, the magnitude of the current flowing in the coils of the relays 10 and 11 at a certain time point t _F eventually. Becomes less than the holding current value, and the relays 10 and 11 are restored.

At this time, the reception switching unit 7 is configured to output a signal NG accordingly when the output of the demodulating unit 6-1 is not input. Therefore, as shown in FIG. the signal NG rises at t _F.

On the other hand, the output of GEN 25 is also supplied to the memory 26. Therefore, the voltage A _ME appearing at the output of DA28 this time is also changed as shown in FIG. 4 (c).

  As described above, the memory 26 sequentially stores the digital data output from the GEN 25 at least two data before and after, and stores the signal at the time when the signal NG is input from the reception switching unit 7. It functions to hold the previous data of the two data before and after that.

Therefore, this memory 26, at time t _F, the point (a voltage Z) Voltage A _ME at t _F (a voltage Y) Voltage A _ME in the immediately preceding is stored and held, this state is the normal operating mode The operation is continued even after the mode is changed to NM, and is maintained until the holding voltage setting mode MM is set again.

  Here, first, regarding the voltage Y at this time, this is because when the relays 10 and 11 used in the system at this time are once operated and then maintained in their operating states, their coils 10d. , 11d, and then with respect to the voltage Z, this is the time when the relays 10 and 11 used in the system at this time once operated and then recovered. This is the voltage applied to the coils 10d and 11d.

Then, it is clear that the holding voltage V _TD inherent to the relays 10 and 11 is between these voltages Y and Z. Therefore, if the voltage Y is set as the voltage A _ME , the holding voltage V _TD is inherent to the relays 10 and 11. the hold voltage V _TD can be determined with a predetermined margin.

Therefore, according to the embodiment of FIG. 3, the holding voltage V _TD is automatically set according to the used relay without performing measurement for each of the relays used in advance. An operation with an accurate holding voltage V _TD can be easily obtained.

It is a block block diagram which shows one Embodiment of the transmission system by this invention. It is a timing diagram for demonstrating operation | movement of one Embodiment of the transmission system by this invention. It is a block block diagram which shows other one Embodiment of the transmission system by this invention. It is a timing diagram for demonstrating operation | movement of other one Embodiment of the transmission system by this invention. It is a block block diagram which shows an example of the transmission system comprised as a duplex system. It is a block block diagram which shows an example of the prior art of the transmission system provided with the bypass path | route by the break contact of an electromagnetic relay. It is a timing diagram for demonstrating operation | movement by an example of the prior art of a transmission system.

Explanation of symbols

T: Transmission side relay part L: Transmission system (wireless or wired)
R: Consulting side relay unit 1-1, 1-2: Modulating unit 2-1, 2-2: Transmitting unit 3: Transmission switching unit 4: Distributor 5-1, 5-2: Receiving unit 6-1, 6 -2: Demodulation unit 7: Reception switching unit 10, 11: Relay (electromagnetic relay)
10a, 11a: Make contact (normally open contact: NO)
10b, 11b: Break contact (normally open contact: NC)
10c, 11c: movable contact 10d, 11d: coil (electromagnetic coil)
20, 20A: Variable control unit

Claims (2)

A first electromagnetic relay in which a break contact is connected to the input of the working system of the switching processing unit for selecting the signal transmission path as the active system and the standby system, and a break contact is connected to the output of the working system of the switching processing unit A second electromagnetic relay; a make contact of the first electromagnetic relay; and a bypass line connecting the make contact of the second electromagnetic relay; and moving the signal transmission path of the first electromagnetic relay. The switch is connected to a contact, and the signal of the switching processing unit is extracted from the movable contact of the second electromagnetic relay, and the operating voltage value of the first and second electromagnetic relays is changed from the make voltage value to the holding voltage value. The variable control unit is configured to switch from the make voltage value to the holding voltage value when a predetermined time has elapsed after the start of energization of the operating current to the electromagnetic relay. In the transmission system constructed in,
The variable control unit lowers the holding voltage of the electromagnetic relay in a stepwise manner with the make voltage value of the electromagnetic relay as an initial value, and when the electromagnetic relay is restored, the voltage of the previous step is stored in the memory. A transmission system configured to control the electromagnetic relay using the voltage stored in the memory as a new holding voltage of the electromagnetic relay . The transmission system according to claim 1, wherein
The transmission system according to claim 1, wherein the storage operation of the holding voltage in the memory by the variable control unit is started by an alarm function provided in the switching processing unit .

Images