JPS63208332A - Device for changing over active and standby transmission section - Google Patents

Abstract

PURPOSE:To attain high speed switching by means of electric changeover and to improve the reliability by controlling the direction of rotation electrically and extracting selectively an output from each transmission section from an output terminal of a circulator as a transmission output. CONSTITUTION:A control circuit 6 controls the direction of rotation of a path switching circulator 2 as shown in figure so as to send an output from an active transmitter 3 to an antenna 1 as shown in single dot chain line. An output from a standby transmitter 4 is terminated by a large power dummy load 9 through circulators 8, 2 and 7 as shown in dotted lines. Then in selecting the standby transmitter 4 and sending its output to the antenna 1, the direction of rotation of the circulator 2 is reversed. In this case, the output of the active transmitter 3 is terminated by a large power dummy load 10 through the circulators 7, 2 and 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a working backup switching device for a transmission system such as satellite communication, and more particularly to a working backup switching device that performs switching purely electrically.

[Conventional technology]

A conventional working/standby switching device is shown in FIG. In the figure,
1 is an antenna, 3 is a working transmitter, 4 is a backup transmitter, 5 is an input distribution circuit, 11 is a waveguide changeover switch, 12 is a high power dummy load, and 36 is a control circuit.

In such a switching device, selection of the working transmitter 3 or the standby transmitter 4 is performed by mechanically switching the waveguide selector switch 11 that responds to the output of the control circuit 36. The figure shows an example where the working transmitter 3 is selected, and the output of the working transmitter 3 is supplied to the antenna 1 through the switch 11. On the other hand, the output of the unselected transmitter 4 is terminated with a high power dummy load 12.

[Problem that the invention seeks to solve]

The above-mentioned conventional active standby switching device has the disadvantage that the waveguide changeover switch itself is expensive, making the device as a whole expensive.

Further, since the changeover switch is a mechanical changeover, the changeover speed is slow, and the control processing of the changeover response signal from the changeover switch is complicated, which also makes the device complicated and expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a working standby switching device that is highly reliable and economical due to purely electrical switching.

Means for Solving Problem C] In order to achieve the above object, the present invention provides a circulator whose rotational direction is variable, to which outputs from the active transmitting section and the backup transmitting section are respectively input to two input terminals; A control section that electrically controls at least the rotational direction of the circulator and selectively extracts outputs from the active transmitting section and the standby transmitting section from the output terminal of the circulator as transmitting outputs. A standby switching device for current use is obtained.

〔Example〕

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

FIG. 1 shows an embodiment of the present invention in which a working transmitter is selected. In the figure, 2 is a path switching circulator that can change the direction of rotation by electrically controlling the direction of the magnetic field, 7 and 8 are circulators with fixed rotation directions, 9 and 10 are high-power dummy loads, and 6 is a control circuit that controls the rotation direction of the path switching circulator 2. Reference numerals 1.3.4.5 are the same as in the conventional example of FIG.

In FIG. 1, the control circuit 6 controls the rotational direction of the path switching circulator 2 in the direction shown in the figure, and the output from the working transmitter 3 is sent to the antenna 1 as shown by the dashed line. The output from the standby transmitter 4 passes through circulators 8.2 and 7 and is terminated by a high power dummy load 9, as shown in dotted lines.

When selecting the backup transmitter 4 and supplying its output to the antenna 1, the direction of rotation of the circuit 2 is reversed. In this case, the output of the working transmitter 3 passes through circulators 7.2 and 8 and is terminated by a high power dummy load 10.

FIG. 2 shows another embodiment of the invention in which a working transmitter is selected. In the figure, reference numeral 26 electrically controls the rotation direction of the path switching circulator 2 and turns on the output power of the working transmitter 3 or standby transmitter 4.
) or off (OFF).

In FIG. 2, the control circuit 26 controls the rotation direction of the path switching circulator 2 for the working transmitter 3 as shown in the figure, and at the same time controls the working transmitter 3 to turn on and the standby transmitter 4 to turn off. , the output from the working transmitter 3 is sent to the antenna 1 as shown by the dashed line. Here, the path switching circulator 2 is also used to improve the impedance of the output from the current transmitter 3.

When selecting the backup transmitter 4, the direction of rotation of the path switching circuit 2 is reversed to that shown in FIG. 2, and at the same time, the backup transmitter 4 is turned on and the working transmitter 3 is turned off.

〔Effect of the invention〕

As explained above, since the present invention performs purely electrical switching using a circulator, high-speed switching is possible and reliability is improved. Further, an expensive waveguide changeover switch is not required, and the circillator used in its place can also be used to improve the impedance of the output circuit, resulting in a simple circuit configuration and a highly economical switching device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the invention, and FIG. 3 is a block diagram showing a prior art. In the figure, 1...Antenna, 2...Route switching circulator, 3...Working transmitter, 4...
・Spare transmitter, 5... Input distribution circuit, 6.26
．． 36... Control circuit, 7.8... Circulator with fixed rotation direction, 9,10°12...
. . . High power dummy load, 11 . . . Indicates a waveguide changeover switch.

Claims (1)

[Claims] a circulator whose rotational direction is variable, to which outputs from the working transmitting section and the backup transmitting section are respectively input to two input terminals; A transmitting unit working/standby switching device, comprising: a control unit that selectively extracts an output from an output terminal of the circulator as a transmitting output.