CN2448016Y - Independent telephone extension secrecy arrangement - Google Patents

Abstract

The utility model relates to an independent telephone extension secrecy device which is used for mutual secrecy between inner telephone extensions and is free from interference. A secrecy circuit comprises a rectification circuit, a current limiting circuit, a voltage detecting circuit and a controlled silicon, the outer part is connected with a communication circuit, and positive pole direct current and negative pole direct current are divided after rectifying by the rectification circuit, wherein, after a positive pole passes through the current limiting circuit, and current is limited, electricity is supplied to communication products of a telephone, etc., through the controlled silicon. The voltage detecting circuit detects the voltage of the circuit and controls the opening and the closing of the controlled silicon to decide whether an independent extension telephone secrecy device can use a communication line or not. The utility model has the advantage of convenient assembly, and the number of the extension telephone is unlimited.

Description

Stand-alone phone extension set scrambler

The utility model relates to a kind of extension scrambler.

For between the interphone, facsimile machine and the online computing that are suitable for work unit and family maintain secrecy mutually and interference-free, be that to remain unit work between the completely restricted extension interference-free, occurred on the market that the equinoctial line device left by extension scrambler such as phone one and the 3-point line device left by phone one, the principle of its secure circuit is the voltage difference when utilizing voltage detector component to detect the telephone wire break-make, judges which extension set of decision can use communication line.But the circuit complexity of these products, volume is big, and the installation limited amount, only is 2 and 3, and inconvenience especially is installed, and each extension set must be gone between during installation on the separated time, is not suitable for fitted up indoor.

The purpose of this utility model is at the above problem, and a kind of easy for installation, the unrestricted stand-alone phone extension set of extension set quantity scrambler is provided.

The purpose of this utility model is achieved in that the utility model comprises secure circuit, secure circuit comprises rectification circuit, current-limiting circuit, voltage detecting circuit and as the controllable silicon of switch control element, rectification circuit is made up of four diodes, the negative electrode of first diode wherein, one input of the anode of second diode and secure circuit is connected together, the negative electrode of the negative electrode of second diode and the 4th diode is connected together and makes the positive pole of rectification circuit output, the one road connects the silicon controlled anode after the current-limiting circuit current limliting, one the tunnel connects the silicon controlled gate pole behind voltage detecting circuit, one output of the anode of the negative electrode of the 3rd diode and the 4th diode and secure circuit is connected together, promptly link with an input of minute machine circuit in use, and the anode of the anode of first diode and the 3rd diode is connected together as the negative pole of rectification circuit output, joins with the silicon controlled negative electrode; Another input of secure circuit is directly exported, another input of extension circuit.The utility model in use, every part machine is adorned a scrambler, scrambler can be contained in extension set inside, also can be contained between outside line and the extension set.Operation principle of the present utility model is: tell the positive and negative polarities direct current by external communication line after the rectification circuit rectification, wherein anodal after the current-limiting circuit current limliting, power to communication products such as telephone sets by controllable silicon, and voltage detecting circuit detection line voltage and control the silicon controlled break-make, determine promptly whether this independent extension set scrambler can use communication line, when all extension sets all do not use communication line, line voltage distribution is higher, this moment, the silicon controlled gate pole was in out state, because all extension sets all do not have to use, so controllable silicon does not have conducting, when an extension set was just using communication line, line voltage distribution was lower, this moment, the silicon controlled gate pole was in off status, except that the extension set that is using, other extension set all can't be switched on, and can not use.

Technique effect of the present utility model is: the utility model is installed very convenient, only need the corresponding telephone set that inserts to get final product, and the quantity of extension set is unrestricted.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the stereogram of the utility model embodiment.

Fig. 2 is the scheme of installation of the utility model embodiment.

Fig. 3 is the circuit theory diagrams of the utility model embodiment.

As shown in Figure 1, the scrambler of present embodiment is made up of telephone plug 1, telephone socket 3, telephone wire 2 and secure circuit, telephone wire is connected between telephone plug 1 and the telephone socket 3, the circuit board of secure circuit is installed in the telephone socket 3, telephone socket 3 is connected with outside line in use, telephone plug 1 is connected with extension, and as shown in Figure 2, and every part machine is joined a scrambler.

As shown in Figure 3, secure circuit is by rectification circuit, current-limiting circuit, voltage detecting circuit and form as the controllable silicon SCR of switch control element, rectification circuit is made up of four fast recovery diode D1-D4, the negative electrode of diode D1 wherein, one input of the anode of diode D2 and secure circuit is connected together, the negative electrode of the negative electrode of diode D2 and diode D4 connects the anode of SCR, and current-limiting circuit is composed in parallel by LED and resistance R 1, the positive pole of the anode termination rectification circuit output of LED, the anode of the negative electrode termination controllable silicon SCR of LED, the positive pole of rectification circuit output connects the gate pole of controllable silicon SCR behind voltage detecting circuit on another road, and voltage detecting circuit is in series by voltage-stabiliser tube ZD1 and resistance R 2, the positive pole of the one termination rectification circuit output of resistance R 2, the negative electrode of another termination voltage-stabiliser tube ZD1, the anode of voltage-stabiliser tube ZD1 connects the gate pole of controllable silicon SCR, one output of the anode of the negative electrode of diode D3 and diode D4 and secure circuit is connected together, an i.e. input of extension circuit in use, and the anode of the anode of diode D1 and diode D3 is connected together as the negative pole of rectification circuit output, with controllable silicon SCR negative electrode join, another input of secure circuit is directly exported, another input of extension circuit.

The operation principle of secure circuit is as follows: tell the positive and negative polarities direct current by external communication line after diode D1-D4 rectification, wherein anodal after LED and resistance R 1 current limliting, power to telephone set by controllable silicon SCR, and the voltage of resistance R 2 and voltage-stabiliser tube ZD1 serial connection back detection line and control the break-make of controllable silicon SCR, determine promptly whether this independent extension set scrambler can use communication line, when all extension sets all do not use communication line, line voltage distribution is higher than 20V, this moment, the gate pole of controllable silicon SCR was in out state, because all extension sets all do not have to use, so controllable silicon SCR does not have conducting, when an extension set was just using communication line, line voltage distribution was lower than 20V, this moment, the gate pole of controllable silicon SCR was in off status, except that the extension set that is using, other extension set all can't be switched on, and can not use.

Completely restricted extension after having used scrambler of the present utility model, when incoming call, the rings simultaneously of all extension sets, the extension set preference call that picks up a receiver at first, other extension set then can not be answered and can not be dialled, and can not disturb the conversation extension set.Equally, when an extension set was dialling or conversing, other extension set can not be answered and can not be dialled, and can not disturb the extension set that is dialling or conversing.Remain unit work like this between each extension set, do not disturb mutually, conversation is maintained secrecy.

Claims (4)

1. stand-alone phone extension set scrambler, comprise secure circuit, it is characterized in that: described secure circuit comprises rectification circuit, current-limiting circuit, voltage detecting circuit and as the controllable silicon SCR of switch control element, rectification circuit is made up of four diode D1-D4, the negative electrode of diode D1 wherein, the anode of diode D2 and an input are connected together, the negative electrode of the negative electrode of diode D2 and diode D4 is connected together and makes the positive pole of rectification circuit output, the one road connects the anode of controllable silicon SCR after current-limiting circuit, one the tunnel connects the gate pole of controllable silicon SCR behind voltage detecting circuit, the anode of the negative electrode of diode D3 and diode D4 and an output are connected together, it is an input of extension circuit, and the anode of the anode of diode D1 and diode D3 is connected together as the negative pole of rectification circuit output, joins with the negative electrode of controllable silicon SCR; Another input of secure circuit is directly exported, another input of extension circuit.

2. stand-alone phone extension set scrambler according to claim 1 is characterized in that: described current-limiting circuit is composed in parallel by LED and resistance R 1, the positive pole of the anode termination rectification circuit output of LED.

3. stand-alone phone extension set scrambler according to claim 1, it is characterized in that: described voltage detecting circuit is in series by voltage-stabiliser tube ZD1 and resistance R 2, the positive pole of the one termination rectification circuit output of resistance R 2, the negative electrode of another termination voltage-stabiliser tube ZD1, the anode of voltage-stabiliser tube ZD1 connects the gate pole of controllable silicon SCR.

4. stand-alone phone extension set scrambler according to claim 1, it is characterized in that: also comprise telephone plug (1), telephone socket (3) and telephone wire (2), telephone wire (2) is connected between telephone plug (1) and the telephone socket (2), the circuit board of secure circuit is installed in the telephone socket (3), telephone socket (3) is connected with outside line, and telephone plug (1) is connected with extension.

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