JPH01213096A - Switch control circuit for hot standby - Google Patents

Abstract

PURPOSE:To realize a control circuit which never becomes impossible to communicate even in a case that trouble occurs in a logical circuit part by detecting a control signal outputted from the logical circuit part of a switch control circuit when a living spare selector switch is controlled. CONSTITUTION:The logical circuit part 1 determines the output of a device according to various kinds of inputted alarm signals similarly to a customary switch circuit, and outputs the control signals of No.1 and No.2. A detecting part 2 detects which the control signal of No.1, No.2 are equal or different. An outputting part 3 outputs the control signals of No.1, No.2 as they are to the living spare selector switch according to the detected result of the detecting part 2 in the case that one of the control signals of No.1, No.2 is ON-control and the other is OFF-control. But in the case that both the control signals of No.1 and No.2 are OFF control or ON-control, it outputs an optional control signal having been set previously to the living spare selector switch.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a switch control circuit for hot standby, and in particular, a switch for hot standby that does not become unable to communicate even if a failure occurs in the logic circuit section. Regarding control circuits.

[Prior Art] In the field of microwave communication devices, hot standby requires a working standby changeover switch for switching device output, and a hot standby switch control circuit to control the switch.

By the way, the conventional hot standby switch control circuit determines the output of the device based on various input alarm signals, and when the active standby selector switch of one transmitter is turned on, the active standby switch of the other transmitter is A control signal was being output to turn off the backup selector switch.

FIG. 3 is a block diagram of a hot standby device using a conventional hot standby switch control circuit.

In the same figure, 11.12 is No. 1 and No. 0.2 transmitter board, 13.14 is No. 1 and No. 1.

2 switches, and 15 is a switch control circuit.

In the above configuration, the switch control circuit 15 has NO, 1
, No. 2 The output of the device is determined by the alarm signal input from the transmitter board 11, 1.2 or from the outside.
,l,No,27. The switches 13 and 14 output control signals respectively. Then, by this control signal, N
o, 1. No. One of the two switches 13 and 14 was on and the other was off.

[Problems to be Solved] The above-described conventional hot standby switch control circuit determines logically and outputs No. 1. No.

Since the active/standby changeover switch was directly switched by the control signal No. 2, if the part that makes logical judgments failed and both control signals were turned on or off, the communication device would be unable to communicate. There was a problem.

The present invention has been made in view of the above problems, and even if a failure occurs in the part that makes logical judgments and both control signals become the same control, communication will not be disabled.・The purpose is to provide a standby switch control circuit.

[Means for Solving Problems] In order to achieve the above object, the pot standby switch control circuit of the present invention includes a logic circuit section that selects whether to use the current or standby mode based on the alarm information ζ output from the alarm input terminal; a detection section that detects whether or not the working control signal and the standby control signal outputted from the logic circuit section are equal; The configuration includes an output section that outputs the signals as they are when they are different, and outputs a preset working control signal and a preset control signal when the signals are the same.

[Example code] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of a hot standby switch control circuit according to an embodiment of the present invention.

In the figure, 1 is a logic circuit section, which, like a conventional switch control circuit, determines the output of the device based on various input alarm signals and outputs control signals N001, No., and 2.

Next, 2 is a detection unit, No. 1. N092
Detect whether the control signals of are equal or different.

Further, 3 is an output section, and according to the detection result of the detection section 2,
N091. If one of the control signals in No. 12 is on control and the other is off control, No. 1. No, 2
The control signal is output as is to the active/standby changeover switch.

However, when both of the control signals NO, 1, NO, and 2 are in the OFF control or ON control, the control signal ζ outputs a preset arbitrary control signal to the working/standby changeover switch.

Next, FIG. 2 is a circuit diagram of a detection section and an output section of the hot standby switch control circuit shown in FIG. 1.

In the figure, 4 is a coil section of the relay, 5.6 is a switch of the relay 4, and 7 and 8 are resistors.

In the above configuration, No. 1. When the control signals NO and 2 are different, a potential difference occurs in the coil of the relay 4, a current flows, and the switches 5 and 6 are placed on the NC side. Therefore, No. 1
．． Each control signal of No., 2, No., 1. No,
2 control signal.

However, No.1. If the control signals of NO and 2 are the same, no current will flow through the relay 4 and the switch 5.6 will be on the No side. For this reason, the working standby changeover switch No. 1. NO
, 2, No. 1 on control, which was roughly set,
A control signal called N082 OFF control is output.

In this way, this embodiment has a control signal detection section on the output side of the conventional circuit, and based on the detection result, outputs an output that outputs the control signal as it is during normal conditions, and outputs an arbitrary control signal during abnormal conditions. It has a department.

[Effects of the Invention] As explained above, the present invention detects the control signal output from the logic circuit section of the switch control circuit to control the active standby changeover switch that determines the output of the hot standby device. This has the effect of providing a hot standby switch control circuit that does not become unable to communicate even if a failure occurs in the circuit section.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a hot standby switch control circuit according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a detection section and an output section of the hot standby switch control circuit shown in FIG. 1, and FIG. is a block diagram of a conventional hot standby switch control circuit. 1: Logic circuit section 2: Detection section 3: Output section

Claims (1)

[Claims] A logic circuit section that selects whether to use the current control signal or the backup control signal based on the alarm information output from the alarm input terminal, and a detection section that detects whether or not the current control signal and the backup control signal output from the logic circuit section are equal. Then, the working control signal and the backup control signal are inputted, and if the two signals are different based on the output of the detection section, they are output as is, and if both signals are the same, the working control signal and the backup control signal set in advance are output. 1. A hot standby switch control circuit, comprising: a control signal; and an output section that outputs a control signal.