JPH0284823A - Redundant system switching circuit network - Google Patents

Abstract

PURPOSE:To eliminate synthetic loss and the fluctuation of an output phase due to switching by providing a variable phase shifter to set a phase quantity decided by a control signal at the insides or the input parts of a device in current use and a spare device. CONSTITUTION:An R switch 29 to be connected to the output terminal of the spare device 9 is connected to two R switches 27 and 28 connected to the output terminals of the device 7 and 8 in current use. Also, an R switch 23 to be connected to the input terminal of the variable phase shifter 3 is connected to two R switches 21 and 22 connected to the input terminal of the variable phase shifters 1 and 2. When a fault occurs in the device 7 in current use, a route is switched to the spare device 9, and also, when the fault occurs in the device 8 in current use, it is switched to the spare device 9 similarly. ln other words, the variable phase shifter 3 automatically controls and corrects the phase shift quantity of each device by the control signal from a control terminal 13 corresponding to the switching state of the device 7 or 8 in current use when the fault occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a redundant switching circuit network, and more particularly to a redundant switching circuit network that switches to a standby unit in parallel synthesis of a plurality of high frequency amplifiers, etc.

[Conventional technology]

In general, in order to ensure high reliability of equipment mounted on a satellite within a limited weight range, in addition to providing a backup device and switching over to a faulty device, it is also necessary to temporarily replace the current equipment. A redundant switching circuit network is used to act as a backup. Particularly in switching circuit networks for low-noise amplifiers or high-output amplifiers, when branching and combining the input power and output power of multiple devices using a hybrid, etc., each If the amount of phase shift of the device is not constant, a composite loss will occur. As shown in the block diagram of FIG. 4, the conventional redundant system switching circuit network includes a hybrid 45 for input power branching,
Hybrid 46 for output power synthesis, current equipment 7.8,
The standby device 9 is composed of R switches 21 to 23 on the input side and R switches 27 to 29 on the output side for switching between two active and one standby. The operation of this redundant system switching network is such that the power input from the input terminal 47 is divided into two by the hybrid 43, passed through the R switches 21 and 22, and amplified in parallel by the current devices 7 and 8. The two amplified output powers pass through the R switches 27 and 28, are combined in the hybrid 46, and are output to the output terminal 48.
For example, if the active device 7 fails and is switched to the backup device 9, the current route A from the R switch 21 to the active device 7 to the R switch 27 is replaced by the backup route B from the R switch 21 to the R switch 27. The path is switched to switch 23 - spare device 9 - R switch 29 - R switch 27. Conventionally, the difference between the high frequency phase shift amount corresponding to the electrical length of the transmission line of route A and the phase shift amount of route B is determined by a switching circuit that matches the electrical length of the transmission line as much as possible to avoid synthetic loss. It formed a net.

[Problem to be solved by the invention]

However, in the conventional redundant switching circuit network described above, each device and the R switch branching/combining circuit are arranged within the limited space of the satellite, taking into consideration the weight and heat balance. It is extremely difficult to reduce the difference in the amount of phase shift between the two times.

Therefore, there is a drawback that a switching network cannot be constructed without a composite loss.

The object of the present invention is to
By providing a variable phase shifter in the input section that can set the phase amount determined by the control signal, the phase difference with the switching route in the switching state is eliminated, and a redundant switching circuit network without synthetic loss is provided. .

[Means to solve the problem]

The redundant switching circuit network of the present invention includes at least two active devices, at least one backup device, a switch connected to each output terminal of the current and backup devices, and a switch connected to each output terminal of the current and backup devices. In a redundant switching circuit network having a switching device or a branch circuit connected to each input terminal of the device, and in which adjacent switching devices or branch circuits are connected to each other, each of the working and standby devices A variable phase shifter is provided, a switching state is controlled by a control signal for setting switching from the active device to the backup device, and a phase shift amount of the variable phase shifter is controlled, and an output terminal of the switched backup device The phase of the output signal from the switch is made to match the phase before switching.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention.

The embodiment of FIG. 1 has a working device 7.8, a standby device 9, a variable phase shifter 1,2°3 having a control terminal 13, and connected to the output terminals of each working and standby device 7-9. R switch 2
7 to 29, R switches 21 to 23 connected to the input terminals of variable phase shifters 1 to 3, respectively, a hybrid 43 for input, and a hybrid 44 for output. One R switch 29 connected to the output terminal of the standby device 9 is connected to two R switches 27.28 connected to the output terminal of the active device 7.8, and to the input terminal of the variable phase shifter 3. One connected R switch 23 is connected to two R switches 21.22 connected to the input terminal of the variable phase shifter 1.2.

For example, if the current device 7 fails, the route A is switched to the route B as described above.

In addition, if the active device 8 fails, the backup device 9
can be switched to That is, the variable phase shifter 3 automatically controls and corrects the amount of phase shift using a control signal from the control terminal 13, depending on the switching state when the current device 7 or 8 fails.

Now, compare the amount of phase shift between the failed transmission path and the switching path,
In order to find the phase shift amount to be corrected by the variable phase shifter, the phase shift amount θ+X+φ, etc. between the R switch, between the R switch and the device, each variable phase shifter, and each device are determined as shown in the symbol explanation diagram in Figure 3. stipulate. (Note that FIG. 3 includes the second embodiment described later.) Here, the route of the current device 7 (route A)
Alternatively, since outputs of the same phase are output no matter which path of the active device 8 is switched to the standby device 9, the following equation holds true. (However, n is an integer) θ 21 + θ3 + χ3 + φ
9+θ9+θ′2F=θ1 +χl +φ7 +θF
±2nπθ22+θ3+χ3+φ9+θ9+θ28 θ
2+χ2+φ8+θ8±2nπ That is, the variable phase χ3 of the variable phase shifter 3 is controlled by the control signal of the control terminal 13 according to the switching state so that one of the above equations is satisfied.

Next, a second embodiment of the present invention will be described with reference to the block diagram of FIG.

A second embodiment of the invention has four working devices 7°8.10
．． 11, variable phase shifters 1, 2, 4.5, two backup devices 9.12, variable phase shifters 3.6, output sides of active and backup devices 7 to 12, and variable phase shifter 1. It has 12 R switches 21 to 32 connected to the input sides of R switches 21 to 6, respectively, a 4-branch circuit 41, and a 4-combining circuit 42. As shown in the figure, the active and backup devices are arranged in a ring shape in the following order: active backup devices 7 and 8, backup device 9, active devices 10 and 11, and backup device 12. Adjacent R switches 27 to 32 connected to the output terminals of the respective devices are connected to each other and arranged in a ring shape. Moreover, mutually adjacent R switches 21 to 26 connected to the input terminals of the respective devices are connected to each other and arranged in a ring shape.

That is, the second embodiment is an example in which the present invention is applied to a 4-branching 4-combining circuit, and is an example of a ring redundant system in which the ratio of active devices to standby devices is 2:1.

The 4-branch circuit 41 and the 4-combined circuit 42 have an angle of 90°1800
Alternatively, it can be realized using three in-phase hybrids.

In the operation of the second embodiment, the power input from the input terminal 43 is branched into four by the four-branch circuit 41. Two of the four powers that have passed through the R switch 21.22 are amplified in parallel by the current device 7.8, and then amplified in parallel by the current device 7.8.
The two powers passing through 25 are amplified in parallel in the current device 10.11. The above-mentioned two power systems are connected to the four combining circuits 42.
For example, the current device 10
If the device fails, the switching paths to the backup are: the active device 8 (referred to as path 1), the backup device 9 (referred to as path 2),
It is set so that three switching paths for the current device 11 (referred to as path 3) are possible.

Here, as in the first embodiment, in order to compare the amount of phase shift between the failed transmission path and the switching path and determine the amount of phase to be corrected by the variable phase shifter, ,
The phase amounts θ, χ, φ, etc. of each variable phase shifter and each device are
Define as shown in the diagram. Now, with respect to the phase of the output of the path of the current device 10, path 1. Route 2. Since outputs of the same phase are output regardless of which path 3 is switched, the following equation holds true.

θ23+θ22+θ2 +χ2 +φ8+θ8+θ28
+θ28+θ29=θ4 +χ4 +φ1o+θ10・
...(Route 1) θ23+θ3+χ3+φ9+θ9+θ29=θ, +χ4
+φ10+θ10 ... (route 2) θ2S+
θ5+χ5+φ11+θ11+θ31=θ4+χ4+φ
1o+θ1o...(route 3) In other words, χ
On the circuit for setting the phase value of 2, χ3, or χ, a control signal is applied to the control terminal 13 of each variable phase shifter to set a predetermined phase that satisfies the above equation. In the explanation of the first and second embodiments, an example was described in which a switch was used on the input/output side of each active and backup device. A circuit configuration in which a branch circuit is provided is also possible.

That is, in the first embodiment, a branch circuit is provided in place of the R switches 21 to 23, and in the second embodiment, in place of the R switches 21 to 26.

〔Effect of the invention〕

As explained above, the present invention controls the variable phase shifter of each device using a command signal at the same time as switching between the active device and the standby device, thereby eliminating synthesis loss and eliminating output phase fluctuations caused by switching. There is an effect that can be done. Therefore, if the redundant switching circuit network of the present invention is applied,
This has the effect of economically realizing a highly reliable device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is a block diagram of a second embodiment of the present invention, and FIG. 3 is a symbolic explanation of the first and second embodiments of the present invention. FIG. 4 is a block diagram of a conventional redundant switching circuit network. 1-6... Variable phase shifter, 7, 8, 10. 11... Current device, 9.12... Back-up device, 13... Control terminal, 21-32... R switch, 41 ...4 branch circuit, 42...4 composite circuit, 43.44...hybrid, 43.47...input terminal, 44.48...output terminal.

Claims (1)

[Claims] at least two active devices, at least one standby device, a switch connected to each output terminal of the active and standby devices, and a switch connected to each input terminal of the active and standby devices. In a redundant switching circuit network having a switching device or a branch circuit, and in which adjacent switching devices or branch circuits are connected to each other, each of the working and standby devices is provided with a variable phase shifter, and the working device controlling the switching state and the amount of phase shift of the variable phase shifter by a control signal that sets switching from to the standby device;
A redundant switching circuit network, characterized in that the phase of the output signal from the switching device of the output terminal of the switched standby device matches the phase before switching.