KR870001820B1 - An alarm system - Google Patents

Abstract

The circuit for detecting the infiltration of enemy and showing the position of it consists of a detecting wire, a nonstable multivibrator(15), a bridge type rectifier(16), and a voltage meter(17) for indicating the distance of the detected position. The detecting wire comprises two element wires connected tightly in parallel but disconnected at the other end part. The capacitance does not exist between two element wires of the detecting wire in normal state, but the output pulse of the multivibrator, which is caused by the capacitance between two element wires, is reduced as much as the variation of the capacitance so that the distance from the detected position can be read out by the voltage meter.

Description

Alarm for detecting disconnection point

1 is an overall configuration diagram of the present invention.

2 is a state diagram of a turn over wire connected to the contacts (J, K) of FIG.

3 is a circuit diagram showing an embodiment of the present invention.

The present invention relates to an alarm for detecting a break point for detecting a penetration point of an enemy so as to immediately take countermeasures.

Conventionally, since only the alarm was provided when cutting the detection line of the alarm, the infiltration point of the enemy could not be known at the time of the mountainous area and the night boundary where the main area or the boundary area was wide and the use of the control room was extremely limited.

The present invention is to solve the above-mentioned shortcomings by installing a wire in the border area when the wire is broken by the enemy infiltration to identify the disconnected point to immediately respond to the action.

Referring to the present invention in detail based on the accompanying drawings as follows.

FIG. 1 is an overall configuration diagram of the present invention, wherein the line break detection unit 11, the switching circuit unit 12, the signal sound generating unit 13, the display unit 14, the unstable multivibrator 15, and the bridge rectifier circuit unit 16 are shown in FIG. And a distance measuring voltmeter 17 and a power supply unit 18. The slide switches SW1, SW2, and SW3 of the switching circuit section 12 are normally positioned to connect the contacts A, B, D, E, and G and H. When the power supplied from the power supply unit 18 drops in voltage through the resistor R11 of the line break detection unit 11, the current flows along the line L1 at the contacts D and E, the contact K, and the short circuit state. It is grounded to the end of the line L2 via the path of the ferry over wire contact J and the contacts B and A. If the shorting wire is cut off, current is applied to the base of the transistor Q11 so that the transistor Q11 is turned on, and the transistor Q21 and the transistor Q31 are also turned on to turn on the beep generator 13. Will sound an alarm indicating that the take-over wire has been disconnected.

At the same time, the LED of the display unit 14 connected to the emitter of the transistor Q21 is driven and turned on.

In this case, when the slide switch of the switching circuit unit 12 is switched to the positions of the contacts B, C, E, F, and H to detect the disconnection point, the power is supplied to the unstable multivibrator 15. It is supplied and oscillates according to the time constant value of the unstable multivibrator 15. At this time, the oscillation frequency of the signal output is input to the turnover wire connected to the contact (J) via the contacts (C, B).

Phosphorous iron wire is two strands connected in parallel at very fine intervals, and the terminal part is short-circuited. Therefore, when the wire is broken, the output pulse signal of the unstable multi-vibrator 15 is determined by the capacitance C between the wires, and the output pulse signal of the unstable multi-vibrator 15 is input to the contact J. When input to the bridge rectifier circuit 16 via the contacts (E, F), it is electronically rectified and input to the distance measuring voltmeter 17 to indicate the disconnected point.

Referring to the effect of the distance measuring voltmeter 17 according to the way of the take over wire as follows.

The capacitance value (C) of the two-wire angle of the parallel conductor,

C: capacitance

εo: dielectric constant

l: length of conductor

d: distance between turning lines

a: lead radius

Therefore, when the wire is cut and the length is shortened, the capacitance C value of the wire is reduced.

In other words, when the phosphorescent iron wire is not normally cut, there is a reactance (XL) component but little capacitance (Xc) component. However, when the wire is cut, the output pulse level of the unstable multivibrator 15 decreases according to the length of the wire as the capacitance Xc.

When the distance measuring voltmeter 17 is connected to both ends of the filter capacitor C14 of FIG. 3 so that the variable state of the pulse level can be recognized, at this time, the disconnection at the contact point J, K is performed by the scale of the data value previously tested. Know the distance to the point.

3 is a circuit diagram illustrating an embodiment of the present invention, which divides a boundary area into several sections and wires a takeover wire for each section to detect a disconnection in the line disconnection detecting unit 11 of the shared section. 11) (21)... n1 and the switching circuits 12, 22. It is configured by connecting (n2) in multiple stages in parallel.

As described above, in the present invention, when the turn-over wire is disconnected by connecting the turn-over wire between the contact (J, K) terminals, the transistor Q11 base of the line disconnection detection unit 11 triggers the transistors Q21, Q31. ), The display unit 14 is connected to the transistor Q21 emitter, and the beep generator 13 is connected to the emitter of the transistor Q31 so that disconnection can be detected, and the slide switch SW1, (SW2) ), (SW3) is switched from the positions of the contacts AB, DE, and GH to the positions of the contacts BC, EF, and HI so that the oscillation output signal of the known unstable multivibrator 15 is known. The pulse level is determined according to the change in the capacitance value along the length of the disconnected overturned wire and is input to the bridge rectifying circuit 16 so that the oscillation output signal pulse level rectified and displayed on the distance measuring voltmeter 17 is displayed. Accurately identify the disconnection point of the turnover wire wired to the area The advantage is that you can see the point immediately.

Claims (1)

As described in the text and shown in the drawing, the power supply unit 18 is connected to the H terminal of the slide switch SW3 of the switching circuit unit 12, and the terminal B of the slide switch SW1 terminal contact point J and the slide switch ( Wire the takeover wire in parallel between the E terminal terminal contact point K of SW2), and the D terminal of the slide switch SW2 and the G terminal of the slide switch SW3 passed through the resistor R11 are disconnected. Of the transistor Q11 to the base of the transistor Q11, connect the display unit 14 to the emitter of the transistor q21 so that the turn-over wire is disconnected, and the beep generator 13 to the emitter of the transistor Q31. After receiving the connection and receiving the alarm, connect the slide switches (SW1, SW2, SW3) to the other contact point (C _o F _o I) so that the disconnection point of the turning over wire can be known so that the slide switch (SW1) of the switching circuit part 12 can be known. Unstable multi-vibration between C terminal and I terminal of slide switch (SW3) Connect the oscillator 15, connect the bridge rectifier circuit portion 16 to the F terminal of the slide switch (SW2), and connect the distance measuring voltmeter (17) to both ends of the capacitor (14) of the bridge rectifier circuit portion 16 Disconnection point detection alarm device, characterized in that configured.

Images