JPH04355506A - Amplifier with redundant function - Google Patents

Abstract

PURPOSE:To devise the system so that a standby transmission line is automatically selected when an internal amplifier of the amplifier is failed so that succeeding circuits to the amplifier incorporating the failed internal amplifier do not lose a signal and to provide the amplifier with the redundant function with less waste in power consumption. CONSTITUTION:An amplifier 1 incorporated with an active transmission line 2, a standby transmission line 3, an internal amplifier 4 and a branch amplifier 5 is provided with switches SW1-SW3, which are thrown in a way that an input signal is sent to an output terminal through the active transmission line 2 normally and thrown in a ways that the input signal sent through the standby transmission line 3 is amplified by the branch amplifier 5 when the internal amplifier 4 is faulty.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an amplifier with a redundant function used mainly in the main line of a television public listening system, and is designed to prevent signals from being stopped on the main line beyond the amplifier even if the amplifier should fail. In this case, the transmission line is automatically switched to the backup transmission line.

0002

2. Description of the Related Art Conventionally, there have been various types of amplifiers with redundant functions, the main ones of which are shown in FIGS. 2 to 4. Amplifier A with redundant function in FIG. 2 has a normal transmission line a into which an internal amplifier c is inserted,
Two transmission lines are provided, including a through backup transmission line b in which no internal amplifier is inserted, and the output of internal amplifier c is constantly detected by a comparator e to check whether it is operating normally. has been detected. During normal operation, the movable contact f of the changeover switch (for example, a high frequency relay) SW contacts the black circle contact g, and the signal input from the input terminal I of the main line is amplified by the internal amplifier c and output to the output terminal O. be done. At this time, the signal amplified by the internal amplifier c is amplified by a branching amplifier d, branched by a branching device h, and outputted from a plurality of terminal side output terminals i. When the internal amplifier c fails, the failure is detected by the comparator e, which outputs a failure detection signal, which causes the movable switch f of the changeover switch SW to move from the black circle contact g. The contact j is switched to the white circle, and the signal inputted from the input terminal I of the main line is outputted from the output terminal O through the backup transmission line b. In this case, since the backup transmission line b is a through line, the signal input from the input terminal I is outputted as is to the output terminal O without being amplified.

The amplifier with redundant function shown in FIG. 3 has a backup amplifier k provided on the backup transmission line b, and is otherwise the same as the amplifier shown in FIG. The main line amplifier with redundant function in Fig. 3 operates in exactly the same way as the main line amplifier with redundant function in Fig. 2 when internal amplifier c is in normal operation, and when internal amplifier c fails, the failure in Fig. 2 is detected by comparator e. Then, the movable switch f of the changeover switch SW switches from the black circle contact g to the white circle contact j, and the main line input terminal I
A signal input from the terminal is outputted to the output terminal O through the backup transmission line b. At this time, the signal passing through the backup transmission line b is amplified by the backup amplifier k.

The redundant function amplifier shown in FIG. 4 is one in which a second amplifier D is provided outside the main amplifier A in parallel. This is because when the internal amplifier c of the main amplifier A is operating normally, the movable contact f of the changeover switch SW contacts the black circle contact g, and the signal input from the input terminal I is output from the output terminal O. When a failure occurs, the failure is detected by the comparator e, and the selector switch SW
The movable segment f switches from the black circle contact g to the white circle contact j, and the signal input from the input terminal I is outputted to the output terminal O through the preliminary transmission line b of the second amplifier D. At this time, the signal passing through the backup transmission line b is amplified by the backup amplifier k of the second amplifier D.

[0005]

[Problems to be Solved by the Invention] Conventional amplifiers with redundant functions have the following problems. ■． In the amplifier with redundant function shown in Fig. 2, there is a backup transmission line b, so even if internal amplifier c fails, the signal beyond that will not stop, but since the backup transmission line b is through, from the input terminal I The input signal cannot be amplified, so the signal level during transmission is reduced. ■． In the amplifier with redundant function shown in FIG. 3, since the backup amplifier k is provided on the backup transmission line b, the signal input from the input terminal I is amplified by the backup amplifier k and the level does not drop. The amplifier is increased in size by the provision of k. ■． In the amplifier with redundant function shown in Fig. 4, the second amplifier D is housed in a separate housing from the main amplifier A, so the two housings are difficult to handle, and a large space is required for installation. Installation work is also troublesome. ■． In the amplifiers with redundant function shown in Figs. 3 and 4, power must always be supplied to the standby amplifier k and the second amplifier D so that they can operate immediately when the movable contact f switches in the event of a failure in the internal amplifier c. This results in a lot of wasted power consumption.

[0006]

[Object of the Invention] An object of the present invention is to provide an amplifier with a redundant function that automatically switches to a standby transmission line when an internal amplifier fails, so that signals beyond the failed amplifier do not stop, and which consumes less power. It is about providing.

[0007]

[Means for Solving the Problems] As shown in FIG. 1, the amplifier with redundant function of the present invention has an amplifier 1 provided with a normal transmission line 2 and a backup transmission line 3, and an internal amplifier 4 of the amplifier 1.
During normal operation, a signal is transmitted to the main line through the normal transmission line 2, and a signal branched from the main line is sent to the branch amplifier 5.
In the main line amplifier with a redundant function, the signal is amplified and transmitted to the terminal side, and when the internal amplifier 4 fails, the signal is transmitted to the main line through the backup transmission line 3. A switch SW is provided for switching the transmission line 3 to be inserted into the backup transmission line 3.

[0008]

[Operation] In the amplifier with redundant function of the present invention, FIG.
When the internal amplifier 4 of the amplifier 1 is operating normally, the movable sections 6, 7, 8 of each switch SW1 to SW3 are in contact with the black circle contacts 9, 10, 11, respectively, and the signal input from the input terminal I is Amplified by internal amplifier 4, switch SW1
The signal is output to the output terminal O through the . At this time, the signal branched from the normal transmission line 2 by the branching device 12 is amplified by the branching amplifier 5, branched by the branching device 13, and outputted from the plurality of terminal side output terminals i. If the internal amplifier 4 fails,
The failure is detected by a detector 14 such as a comparator, and the detection output from the detector 14 causes the switch SW1 to be detected.
~SW3 movable sections 6, 7, 8 are black circle contacts 9, 10
, 11 to white circle contacts 15, 16, and 17. As a result, the signal input from the input terminal I is transferred to the switch SW.
2 - Branch amplifier 5 - Switch SW3 - Switch SW
1 and is output to the output terminal O. As a result, the signal beyond the failed amplifier 1 does not stop.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an amplifier with a redundant function according to the present invention will be described with reference to FIG. 1 in Figure 1 is an amplifier such as a main amplifier, which includes a normal transmission line 2, a backup transmission line 3,
, internal amplifier 4, first coupler 21, second coupler 12
, switches SW1, SW2, SW3, a detector 14 such as a comparator, a branch amplifier 5, and a distributor 13 are provided. In the amplifier of FIG. 1, the signal input from the input terminal I to the normal transmission line 2 is amplified by the internal amplifier 4, a part of which is branched by the first branching device 21 and input to the detector 14, and the signal is The internal amplifier 4 is constantly compared with a reference value by the detector 14 to detect whether or not the internal amplifier 4 is operating normally. When the amplifier 4 is operating normally, the switches SW1 and SW
2, SW3 movable contacts 6, 7, 8 are black circle contacts 9, 1
0 and 11, the signal input from the input terminal I is output to the output terminal O. Further, a part of the input signal branched by the second coupler 12 is inputted to the branching amplifier 5 through the switch SW2, amplified by the same amplifier 5, and inputted to the branching device h through the switch SW3.
The signal is branched at 1 and output from a plurality of terminal side output terminals i.

When the internal amplifier 4 in the amplifier 1 with redundant function of FIG. 1 fails, the signal branched at the first coupler 21 and inputted to the detector 14 is compared with a reference value by the detector 14 to detect the failure. It is detected that As a result, the movable contacts 6, 7, and 8 of the switches SW1, SW2, and SW3 switch from the black circle contacts 9, 10, and 11 to the white circle contacts 15, 16, and 17, and the signal input from the input terminal I passes through the backup transmission line 3. As shown, the signal is outputted to the output terminal O through the switch SW2, the branch amplifier 5, the switch SW3, and the switch SW1.

[0011]

[Effects of the Invention] The amplifier with redundant function of the present invention has the following effects. ■． When the internal amplifier 4 is operating normally, the branch amplifier 5 amplifies the signal transmitted to the terminal side, but when the internal amplifier 4 is in failure, it works as a backup amplifier to amplify the signal transmitted through the backup transmission line 3. Even at the same time, the signal beyond the amplifier 1 that includes the amplifier 4 will not stop. ■． Since there is no need to newly provide a backup amplifier for use in case of a failure as shown in FIGS. 3 and 4, the branch amplifier 5 of the main amplifier 1 can be effectively utilized, and the amplifier 1 can be made smaller without becoming particularly complicated. It doesn't increase costs either. ■． As in the case of FIG.
It is easy to handle as it does not need to be in a separate casing.
The installation space is small. ■． Since the branch amplifier 5, which also serves as a preamplifier, operates without waste, there is no waste of power consumption due to leaving the preamplifier k and second amplifier D idle as shown in FIGS. 3 and 4. ■． Since the signal transmitted on the backup transmission line 3 is amplified by the branch amplifier 5, the level of the signal does not drop.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of an amplifier with redundant function of the present invention.

FIG. 2 is an explanatory diagram showing a first example of a conventional amplifier with redundant function.

FIG. 3 is an explanatory diagram showing a second example of a conventional amplifier with redundant function.

FIG. 4 is an explanatory diagram showing a third example of a conventional amplifier with redundant function.

[Explanation of symbols]

1 Main amplifier 2 Normal transmission line 3. Backup transmission line 4 Internal amplifier 5 Branch amplifier SW switch

Claims (1)

[Claims] [Claim 1] An amplifier 1 is provided with a normal transmission line 2 and a backup transmission line 3, and when the internal amplifier 4 of the amplifier 1 is in normal operation, a signal is transmitted to the main line through the normal transmission line 2 and is branched from the main line. In an amplifier with a redundant function, the signal is amplified by the branch amplifier 5 and transmitted to the terminal side, and when the internal amplifier 4 fails, the signal is transmitted to the main line through the backup transmission line 3. An amplifier with a redundant function, characterized in that a switch SW is provided to switch the branch amplifier 5 so that it is inserted into the backup transmission line 3.