KR930000913Y1 - Switching circuit - Google Patents

Abstract

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Description

On / off switching circuit

1 is a block diagram of an audio transmission / reception and image signal circuit for indoor installation of a video call and burglar alarm system including a selective on / off switching circuit of an image signal transmission system of the present invention.

2 is a detailed circuit diagram of the central control IC of FIG.

* Explanation of symbols for main parts of the drawings

100: central control IC 110: power supply circuit

120: monitor power supply circuit portion 130: voice input circuit portion

140: image output switching circuit unit 150: alarm signal detection circuit unit

160: voice output circuit unit 170: call volume control circuit unit

180: alarm signal generation IC 190: call and camera theft signal generation IC

TR ₁ -TR ₁₄ : Transistor D ₁ -D ₁₁ : Diode

ZD ₁ , ZD ₂ : Zener Diode SW ₁ : Security Switch

SW ₂ : Variable contact switch TS ₁ , TS ₂ : Tact switch

CRT: Monitor C ₁ -C ₁₂ : Condenser

R ₁ -R ₁₈ : resistance

The present invention relates to a video call and burglar alarm system, and in detail, the user can simply turn on / off the video transmission system indoors without manipulating the handset or check the visitor according to the call signal from the outside through the monitor. The present invention relates to an on / off switching circuit which allows a simple reset of an image signal transmission system even when a switch is not operated.

Install door phones and cameras outside the house such as doors and entrances, and install corresponding door phones and monitors indoors so that visitors' identity can be easily and clearly identified through a monitor. And a video call system for theft alarm circuit have been proposed by the applicant of the present invention as Utility Model Registration No. 89-16417.

Here, the existing video call system (video phone system) is composed of a large number of indoor and external signal transmission lines (5-line-8 lines), which significantly reduces problems such as qualitative degradation of audio and video output. The improved video call circuit of the unique 4-wire communication system is disclosed.

In addition, in the above-mentioned application by the applicant of the present invention, the intruder alarm circuit and the theft detection circuit of the camera for outdoor installation are built in the video call system, which is added compared to the existing video phone system which has to establish an anti-theft system separately from the video call system. It eliminates the cost and difficulty in installing the incident.

However, in the prior application (Application No. 89-16417) technology by the applicant of the present invention, when the external call is made, the external camera and the monitor are automatically configured to apply the operating power for a predetermined time (about 30 seconds), After confirming the visitor and picking up the handset and placing the handset in place, the video signal transmission system is reset.However, after checking through the monitor, even if the call with the visitor becomes impossible due to mischief or does not need to make a call, the system internally During the set time (about 30 seconds), the camera and monitor are unnecessarily operated.

That is, since the selective on / off control means of the image transmission system is not particularly provided, the camera and the monitor continue to operate unless the handset is intentionally lifted and released.

This leads to unnecessary power consumption, especially when the monitor is installed in the bedroom may cause sleep disturbance and psychological anxiety due to unnecessary operation of the monitor for a long time.

An object of the present invention is to provide an on / off switching circuit which enables selective on / off control of an image transmission system of a video call system indoors to solve the above problems.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. ₁ , the output of the power supply circuit unit 110 including the polyswitch PS, the diode D1, the capacitors C ₁ -C ₂ , and the output stabilization transistor TR ₁ is monitored. Connected to the power input terminal 1 of the monitor (CRT) through the supply circuit unit 120 and the image input signal of the monitor (CRT) is the image output signal of the camera installed outside the transmission line (L ₄ ) and the condenser Connect to the image signal input terminal (2) via (C ₈ ).

The monitor power supply circuit unit 120 may include a switching transistor TR ₂ , a resistor R ₁ , a capacitor C ₄ -C ₇ , and the like controlled according to the output of the monitor control terminal 10 of the central control IC 100. An output stabilization transistor TR ₃ .

In addition, the output of the power supply circuit unit 110 is connected to be applied to the power supply terminal 15 and the alarm signal detection circuit unit 150 of the central control IC 100, and the terminal (2-1) of the hook switch (HS ₂ ) The terminals 2-3 are further connected to each other through the power output lock terminal 11 of the central control IC 100 and the power voltage of the alarm signal detection circuit unit 150.

The alarm signal detecting circuit unit 150 includes a thyristor (SCR ₁ ) for supplying an operating voltage to the alarm sino generating IC (180) and a resistance (R ₂ , R ₆ ) bias circuit and magnet for the thyristor (SCR ₁ ) trigger. Select the contact switch (MS ₁ ), the thyristor (SCR ₁ ), the trigger suppression transistor (TR ₄ ) and the transistor (TR ₄ ) selection or the light emitting diode (LED ₁ ) selection for alarm circuit operation indication (SW ₁ ). Include.

The voltage output from the power output terminal 16 of the central control IC 100 is connected to be supplied to the external camera through the transmission line L ₁ , and the voltage is also applied to the voice input / output circuits 130 and 160. Connect it.

The voice input circuit unit 130 includes resistors R ₇ and R ₈ and capacitors C ₉ and C ₁₀ , and the voice output circuit unit 160 output transistors T ₁ and TR ₅ . Include.

The speaker SP ₁ has an output of the voice output circuit unit 160 and a signal output terminal of the central control IC 100 through a terminal 2-1 or terminal 2-3 of the hook switch HS ₃ . Connect so that the output of (3) is applied.

On the other hand, when an operating voltage is applied to the alarm signal generating IC 180 by the alarm signal detecting circuit unit 150, the alarm pulse is generated at its terminal 4 and the alarm signal is generated at its terminal 5, respectively. The call signal from the door phone installed at the outside is connected to the call signal input terminal 5 of the central control IC 100 via the hook switch HS ₄ through the transmission line L ₃ , and then The generated high level theft signal is connected to be applied to the theft signal input terminal 7 of the central control IC 100 through the transmission line L ₄ .

The chime and each creek control terminal of the central control IC 100 which outputs a high level according to the detection signal levels input to the terminals 5 and 7 of the central control IC 100, that is, low and high levels, respectively. The lure of (4,1) is connected to each chime and creek input terminal (7,6) of the call and camera burglar signal generation IC (190), and the output terminal of the call and camera burglar signal generation IC (190). The chime and creek signal of the common signal and the alarm output of the alarm signal generating IC 180 through the call volume control circuit unit 170 including a variable contact switch (SW ₂ ) and a resistor (R ₉ -R ₁₁ ) combination It is connected to be applied to the terminal 19 of the central control IC 100 via the terminal (2-3) of the hook switch (H ₁ ).

In addition, the output signal of the short pulse output terminal 15 of the call and the camera burglar signal generating IC l90 in which the detection pulse is output when a high level is input to any one of the terminals 7 and 6 is a backflow prevention diode (D). ₃ ), the pulse input terminal of the central control IC (100) after becoming common with the alarm pulse of the short pulse output terminal (4) of the alarm signal generating IC (l80) is also output through the backflow prevention diode (D ₂ ) And a tack switch TS ₁ connected between the pulse input terminal 13 and the power supply terminal 6 of the central control IC 100, and a zener diode (6) to the terminal 6. ZD ₁ ).

The image output switching circuit unit 140 is connected to the application output latch terminals 14 and 12 of the central control IC 100.

The image output switching circuit unit 140 connects the capacitor C ₁₁ between the terminals 14 and ₁₂ of the central control IC 100, and the tact switch TS _{1 to the} power output latch terminal 14. ) Is connected to the collector terminal of the transistor (TR ₆ ) through another tact switch (TS ₂ ), and the power output latch terminal (12) is a resistor (R ₁₂ , R ₁₃ ), diode (D ₄ , D ₅₎ ) and is connected in the collector potential of the capacitor (C ₁₂₎ base potential and the transistor (TR ₇₎ of the circuit via a transistor combination (TR ₆₎ is applied.

The zener voltage of the zener diode ZD ₁ by the tact switch TS _{1 is} connected to the base terminal of the transistor TR ₇ through a resistor R ₁₄ .

FIG. 2 is a detailed internal circuit diagram of the central control IC 100 applied in FIG.

As can be seen here, when the call signal (low level) from the transmission line L ₃ is input to the call signal input terminal 5, the transistor R ₁₂ is turned on and the power supply terminal at its chime control terminal 4. The high level of (6) is output.

In addition, when the camera theft signal (high level) is input to the theft signal input terminal 7 through the transmission line L ₄ , the transistors TR ₁₄ and TR ₁₃ are turned on, and this time, the voltage of the power supply terminal 6 is turned on. The transistor TR ₁₃ is configured to appear on the creek control terminal 1.

In this case, the high level of the terminal 7 is connected to provide the high level to the base of the transistor TR ₁₂ through the diode D ₆ so that the low level is output from the terminal 4.

In addition, when a high pulse or a zener voltage of the zener diode ZD ₁ is applied to the pulse input terminal 13, the voltage or pulse is applied to the base of the transistor TR ₁₁ and output to the power output latch terminal 14. connections, the collector output of the transistor (TR ₁₀₎ which is controlled by the output of said transistor (TR ₁₁₎ is the power output latch tab 12 connection and at the same time the diode (D ₇₎ appear in more through the transistor (TR ₉₎ The output of the transistor TR ₉ is connected to the monitor control terminal 10 and is connected to the base of the transistor TR ₈ through the diode D ₈ terminals ₉ and _{17 as it} is. The collector output of the transistor TR ₈ is configured to be connected to the power output terminal 16.

In addition, a signal input to the signal input terminal 19 is amplified by an amplifier AMP ₁ and then passed through a capacitor C ₁₃ between the terminal 18 and the terminal 3, and then a resistor R ₁₅ and a clipping diode D _9. , D ₁₀ ) to be output to the voice output terminal 2.

In the drawing, the door phone handset installed in the room is normally placed, that is, in the normal state, the terminal positions of all the hook switches HS ₁ -HS ₄ are connected to the terminals 2-3, and the alarm signal detection circuit unit 150 ) Has a function as an burglar alarm circuit with the method switch SW ₁ connected to the terminal 2-3.

In addition, the tact switches TS ₁ and TS ₂ interlocked with each other are normally opened.

Referring to the operation and effects of the present invention configured as described in detail as follows.

First, the operation of the alarm signal detection circuit unit 150 of FIG. ₁ will be described. When the security switch SW ₁ is positioned at the terminal 1-3, the resistors R ₃ and R are provided at the base of the transistor TR ₄ . The transistor TR ₄ is turned on because the output voltage of the power supply circuit unit 110 through ₄ is applied. Therefore, since the gate potential of the thyristor SCR ₁ is lowered to the ground level, the alarm signal generating IC 180 cuts the operating power supply voltage, so that the anti-theft alarm does not occur even when the magnet contact circuit MS ₁ operates.

However way switch (SW ₁₎ is the terminal (2-3) when it reaches a position to put the magnet contact circuit of the normally-on state OFF, that is, when detecting the theft or intruder thyristor (SCR ₁₎ to the resistance (R ₂ Since the gate is triggered by the output voltage of the power circuit unit 110 through R ₆ , an operating voltage is supplied to the alarm signal generation TC 180.

Accordingly, an alarm signal is generated at the terminal 5 of the alarm signal generating IC 180, which passes through the terminal 2-3 of the hook switch HS ₁ through a condenser and then the signal input terminal of the central control IC 100 ( 19).

The alarm signal inputted to the signal input terminal 19 of the central control IC 100 of FIG. 2 is amplified by the amplifier AMP ₁ and then the terminals 2-3 of the condenser C ₁₃ and the hook switch HS ₃ . Through the speaker (SP ₁ ) is output.

The following describes a voice and video call operation process according to a call from an externally installed door phone.

When the ground level according to the call button of the external door phone is input through the call and voice signal transmission line L ₃ , the ground level is controlled by the central control IC 100 via the terminal 2-3 of the hook switch HS ₄ . Is applied to the call signal input terminal (5). Therefore, since the transistor TR ₁₂ of the central control IC 100 shown in FIG. 2 is turned on, its collector output is output to the chime control terminal 4 of the central control IC 100.

Accordingly, when a high level is applied to the chime input terminal 7 of the call and camera theft signal generating IC 190, a short pulse is generated at its pulse output terminal 15 and a chime signal is generated at its terminal 12.

The chime signal is applied when the low level of the call signal input terminal 5 of the central control IC 100 through the resistor R ₁₆ is applied to the call and camera burglar signal generation IC 190 through the line L ₁₁ . Is generated and applied to the call volume control circuit unit 170 through the line L ₁₂ .

The call volume control circuit unit 170 generates a chime signal whose volume is adjusted according to a combination of the resistors R _9- R ₁₁ according to the operation of the variable contact switch SW ₂ , which is the central control IC 100. The signal input terminal 19 is input through the terminal 2-3 of the hook switch HS ₁ .

Thus, the terminals (2-3) of the chime signal is output to the terminal 18 after being amplified by the amplifier (AMP _1), the main control IC (100), a capacitor (C ₁₃₎ and a hook switch (HS ₃₎ It is further output to the speaker SP ₁ .

On the other hand, the moment when the short pulse signal output from the pulse output terminal 15 of the chime and camera theft signal generation IC 190 is input to the pulse input terminal 13 of the central control IC l00 through the diode D ₃ . Since the transistor TR _{7 in the} image output switching circuit unit 140 is turned on, the capacitor C ₁₁ is charged with the power output latch terminal 14 side of the central control IC 100 in the + direction and then the transistor TR _11. Turn on).

Accordingly, since the transistor TR ₁₀ is turned off, the high level of the power supply voltage is output from the collector terminal thereof. At this time, the capacitor C ₁₁ in the image output switching circuit unit 140 is reversely charged with the power output latch terminal 14 side of the central control IC 100 in the + direction, and then inputted to the pulse input terminal 13. The transistor TR ₁₁ remains on by the reverse charge current of the capacitor C ₁₁ even when the pulse signal is passed.

And determining a reverse charging time of the capacitor (C ₁₁₎ with a time constant by the resistance value of the capacitor and the capacitance of the (C ₁₁₎ resistance (R _17, R _18), is set usually around 30 seconds.

When the short pulse output at the pulse output terminal l5 of the call and camera burglar signal generation IC 190 passes, the transistor TR ₇ of the image pull power switching circuit unit 140 is turned off, and the central control IC 100 The power supply voltage output from the power output latch terminal 12 is charged to the capacitor C ₁₂ through the resistor R ₁₂ and the diode D ₅ in the image output switching circuit unit 140, and then the resistance R ₁₃ is further added. Through this, the transistor TR ₈ is maintained in a biased state.

Meanwhile, the collector stage output of the transistor TR ₁₀ , which maintains the high level output for the predetermined time by the capacitor C ₁₁ , turns on the transistor TR ₉ through the diode D ₇ .

Therefore, since the low level is output from the terminals ₁₀ and ₉ by the transistor TR ₉ , the operating voltage is supplied to the monitor CRT by turning on the switching transistor TR ₂ of the monitor power supply circuit unit 120.

In addition, the low level output of the terminal 9 turns on the transistor TR ₈ so that the power supply voltage output of the power circuit unit 110 is generated at the terminal 16 of the central control IC 100. The output voltage is applied to the voice output circuit unit 160 as an operating voltage, and at the same time, the operating voltage is also supplied to an external camera power supply transmission line L ₁ .

Therefore, the external camera is operated and the image signal output from the camera is input to the image input terminal 2 of the indoor monitor CRT through the transmission line L ₄ . It will work at the same time.

As described above, even when the pulse inputted to the terminal 13 of the central control IC 100 passes, the on state of the transistor TR ₁₁ and the off state of the transistor TR ₁₀ are maintained by the capacitor C ₁₁ . In this case, when the interlocking tact switches TS ₁ and TS ₂ are pressed, the tact switches TS _{1 are} connected to the zener diode ZD _{1 at the} base of the transistor TR ₇ of the image output switching circuit 14. Since the zener voltage is applied, the transistor TR ₇ is turned on, and the tact switch TS ₂ constitutes a collector terminal current path circuit of the transistor TR ₆ , so that the voltage between the both ends of the capacitor C ₁₁ is, of course, as well. The base potentials of the transistors TR ₁₁ and TR _{9 in the} central control IC 100 become the ground level, so that the power supply to the monitor CRT and the external camera is cut off.

That is, as the operation of pressing the tact switch, the operation of the monitor (CRT) and the external camera according to the external call can be canceled within a predetermined set time.

In addition, the present invention can simply turn on the image transmission system by arbitrarily operating the tact switches TS ₁ and TS ₂ of the image output switching circuit unit 140.

For example, if you want to monitor the external situation of a house or the like through an external camera indoors, the tact switches TS ₁ and TS ₂ communicated with each other are pressed once.

In this case, the zener voltage generated by the tact switch TS ₁ is applied to the resistor R ₁₄ at the base of the pulse input terminal 13 of the central control IC 100 and the transistor TR ₇ of the image output switching circuit unit 140. Is applied through).

Accordingly, the capacitor C ₁₁ of the image output switching circuit unit 140 is charged by the Zener voltage input to the pulse input terminal 13 of the central control IC 100, and the transistor TR ₁₁ of the central control IC 100 is charged. ) Is on.

The capacitor C ₁₁ is charged through a current path consisting of a resistor R ₁₂ and a transistor TR ₇ with the power output latch terminal 14 at the + potential side, and is turned on by the transistor TR ₁₁ . the collector output of the transistor (TR ₁₀₎ which is off of the capacitor (C ₁₁₎ - will escape to the transistor (TR ₇₎ through an output latch tab 12 toward the electric potential.

The tact switch (TS _2), the collector current path of the transistor (TR ₆₎ form, but by no bias takes on its base doemro the tact switch (TS ₂₎ is not not have any effect to the image output switching circuit 140 do.

After releasing the interlocking tact switch TS ₁ and TS ₂ , the transistor TR ₇ of the image output switching circuit unit 140 is turned off, and the capacitor C _{11 is} connected to the resistors R ₁₇ and R ₁₈ . The transistor TR ₁₁ of the central control IC 100 is maintained in an on state while discharging through a current path including a diode D ₄ and a capacitor C ₁₂ .

Accordingly, the high collector potential of the transistor TR ₁₀ is supplied to the base of the transistor TR ₉ through the diode D ₇ and to the power output latch terminal 12 of the central control IC 100. C ₁₁ ) reversely charges the terminal 12 to the + side, and charges the potential of the terminal 12 to the capacitor C ₁₂ through the resistor R ₁₂ and the diode D ₅ , and then resistors again. The bias voltage is supplied to the base of the transistor TR ₆ through R ₁₃ .

Therefore, since the bias voltage is continuously supplied to the base of the transistor TR ₁₁ during the time when the capacitor C ₁₁ is reversely charged through the resistors R ₁₇ and R ₁₈ , the low level is applied to the monitor control terminal 10. At the output terminal 16, a high level is output to open the image transmission system.

On the contrary, when the image transmission system is to be reset, the interlocking contact switches TS ₁ and TS ₂ are pressed again, and the description thereof is the same as described above.

On the other hand, if the next call, make a call to the visitor according to the external motif you (CRT) has picked up the handset of the room there is a door phone, so that all terminals of the hook switch (HS ₁ -HS ₄₎ terminals and (2-1 ), The internal and external voice call becomes possible.

If this is comprehensively explained as follows.

The voice signal input to the microphone CM ₁ is input to the signal input terminal 19 of the central control IC 100 through the terminal 2-1 of the hook switch HS ₁ . This is amplified by the amplifier AMP _{1 in the} central control IC 100 and output to the terminal 2 thereof. The terminal of the hook switch HS ₄ is passed through the transformer T _{1 in the} indoor sound output circuit unit 160. 2-1) is transmitted to the indoor voice signal transmission and the external call signal transmission line (L ₃ ).

In addition, the external audio signal input through the external camera power supply and external voice signal transmission line (L ₁ ) is amplified by the indoor audio output circuit unit 160 and then the terminal 2-1 of the hook switch (HS ₃ ). Through the indoor speaker (SP ₁ ) is output.

Prior to this operation, when the handset is lifted indoors, since the hook switch HS ₂ is positioned as the terminal 2-1, the output voltage of the power circuit unit 110 is set to the power output lock terminal 11 of the central control IC 100. ) Is entered.

Accordingly, the transistor TR ₁₀ is turned on to bring the power output latch terminal 12 to the ground level, thereby extracting the charge of the capacitor C _{11 in the} image output switching circuit unit 140, thereby resetting the image output switching circuit unit. do.

At the same time, since the voltage of the power output lock terminal 11 passing through the diode D ₁₁ is continuously applied to the base of the transistor TR ₉ , the output terminal 16 and the monitor control terminal 10 of the central control IC 100 are continuously applied. ), The external camera operating voltage and the monitor operating voltage are continuously output.

The following describes a camera burglar alarm circuit to prevent theft of an externally installed camera.

When a video signal and transmits the camera theft of external cameras when the high level, the transmission line (L ₄₎ at a high level in accordance with the camera stolen from the high level is inputted to the theft signal input terminal 7 of the central control lC (100).

Accordingly, since the transistors TR ₁₄ and TR ₁₃ are turned on, the high level of the power supply voltage through the transistor TR ₁₃ is output from the creek control terminal 1.

At this time, since the level of the terminal 5 also becomes a high level by the diode D ₆ , the transistor TR ₁₂ is turned off so that the high level is not output from the chime control terminal 4. On the other hand, the high level output of the creek control terminal 1 is inputted to the terminals 4 and 5 of the call and camera burglar signal generating IC 190 and is also called because the potential input through the line L ₁₁ is high level. And a creek signal is generated at the output line L ₁₂ of the camera theft signaling IC 190.

The creek signal is amplified by the central control IC 100 through the same path as described above, and then output as a camera theft warning sound through the speaker SP ₁ .

As described above, the present invention can reduce installation time and installation cost as well as minimize the noise phenomenon in images and images due to phase interference between transmission lines as the video call system is distinguished by a four-wire system.

In addition, by adding a burglar alarm circuit and an external camera theft detection circuit in a single video call system, it is possible to reduce installation work and installation costs by adding a separate burglar alarm circuit after installing a conventional video call system.

In particular, the present invention can be turned on / off the operation of the monitor and the camera according to the external call only by tact switch operation in the room can prevent sleep disturbance and power consumption due to unnecessary operation of the camera and the monitor during the set time. The unique effect and the unique effect of simply monitoring the situation around the house or building indoors through the camera can be achieved.

Claims (1)

Calling with the central control IC 100, the power supply circuit unit 110, the monitor power supply circuit unit 120, the voice input / output circuit unit 130, 160, the alarm signal detection circuit unit 150, the alarm signal detection and generation circuit unit 150, 180, and In the four-line transmission call and burglar alarm circuit including a camera burglar signal generating circuit unit 190, an image transmission time set to be connected to both ends of the power output latch terminals 14 and 12 of the central control IC 100. A capacitor C ₁₁ ; A tact switch (TS ₂ ) for controlling on / off of the collector current path of the transistor (TR ₆ ) to bypass the potential of the power output latch terminal (14); A tact switch TS ₁ interlocked with the tact switch TS ₂ for supplying a zener voltage to the base of the transistor TR ₇ to bypass the potential of the power output latch terminal 12 through the resistor R ₁₂ . )Wow; A transistor (TR ₆₎ bias of the resistor (R _12), diode (D _5), a capacitor (C ₁₂₎ and a resistor (R ₁₃₎ for supplying full power latch tab 12 to the base of the transistor (TR ₆₎ Circuits; An image output switching circuit 140 including a diode D ₁₄ and a current path circuit of a capacitor C ₁₂ for forming a discharge current path of the capacitor C ₁₁ is connected to the central control IC 100 and a power supply. On / off switching circuit, characterized in that provided in the output latch terminal (14, 12).