CN210694073U

CN210694073U - Called detection and calling ringing circuit of level trigger interphone

Info

Publication number: CN210694073U
Application number: CN201921932106.XU
Authority: CN
Inventors: 陈东东; 陶洋; 陈小军; 黄毅; 黄章良
Original assignee: Guangzhou Robustel Technologies Co ltd
Current assignee: Guangzhou Lubangtong IoT Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-06-05
Anticipated expiration: 2029-11-08

Abstract

The utility model discloses a called detection and calling ring circuit of level trigger type intercom, including controller and intercom, still including the intercom that is connected with intercom power source interface and the controller of intercom respectively insert detection circuitry, be connected with the analog voice input interface and the controller of intercom respectively and be used for carrying out the called detection and the trigger mode detection circuitry that detect to the called of intercom and level trigger type to and, be connected with the analog voice output and the controller of intercom respectively and be used for detecting the calling ring trigger circuit that triggers control to intercom calling ring according to the detection signal that the called detects and trigger mode detection circuitry, called detection and trigger mode detection circuitry, calling ring trigger circuit and intercom insert detection circuitry and still are connected with system power respectively. Through the utility model discloses can save the cost, realize automated inspection, improve the reliability.

Description

Called detection and calling ringing circuit of level trigger interphone

Technical Field

The utility model relates to an electronic communication field especially relates to a called of level trigger type intercom detects and calling party ringing circuit.

Background

The interfaces of the level-triggered interphone are four lines, namely K (analog voice input), Y (analog voice output), 12V (power output) and GND (ground), and are divided into a high-level-triggered interphone and a low-level-triggered interphone, and the level-triggered interphone is mainly applied to elevators and buildings. The current design of a circuit for detecting a called party and ringing a calling party of a level trigger interphone is usually composed of a relay, a large inductor, a transformer, a dial switch, a plurality of power amplifiers, an MCU (single chip microcomputer), a triode, an MOS (metal oxide semiconductor) tube diode and the like.

During the in-service use, the circuit of this structure, bulky, can't carry out miniaturized design, the cost is higher, and the system composition need develop CPU in addition, still must develop the singlechip alone and accomplish the called detection and the calling ring function of intercom to unable automated inspection male intercom type is high level trigger type or low level trigger type, thereby can't automated inspection intercom pull out and insert.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a called of level trigger type intercom detects and calling party ringing circuit, can save the cost, realizes automated inspection, improves the reliability.

In order to achieve the purpose, the called detection and calling ringing circuit of the level triggering interphone comprises a controller and the interphone, and further comprises an interphone plug-in detection circuit respectively connected with an interphone power interface and the controller of the interphone, a called detection and triggering mode detection circuit respectively connected with an analog voice input interface and the controller of the interphone and used for detecting the called and level triggering types of the interphone, and a calling ringing trigger circuit respectively connected with an analog voice output and the controller of the interphone and used for triggering and controlling calling ringing of the interphone according to detection signals of the called detection and triggering mode detection circuit, wherein the called detection and triggering mode detection circuit, the calling ringing trigger circuit and the interphone plug-in detection circuit are further respectively connected with a system power supply.

Preferably, the interphone plug-in detection circuit comprises a sixth triode, a twenty-fifth resistor and a twenty-sixth resistor, wherein the base of the sixth triode is connected with the interphone power interface through the twenty-sixth resistor, the collector of the sixth triode is connected with the plug-in detection end of the controller and is also connected with the system power through the twenty-fifth resistor, and the emitter of the sixth triode is connected with the ground wire.

Preferably, the system power supply is direct current 3.3V.

Preferably, the called detection and trigger mode detection circuit includes a first transformer and a first triode, two ends of a primary side of the first transformer are respectively connected with a positive input end of a microphone and a negative input end of the microphone, one end of two ends of a secondary side of the first transformer is connected with an analog voice input interface and the other end is connected with a ground wire sequentially through a nineteenth resistor and a tenth resistor, a connection end between the nineteenth resistor and the tenth resistor is connected with a base of the first triode, a collector of the first triode is connected with a called detection end of the controller and is also connected with a system power supply through an eighth resistor, and an emitter of the first triode is connected with the ground wire.

Preferably, the first transformer specification is 1:1, 2.2 uH.

Preferably, the calling ring trigger circuit includes a second voltage device, a second MOS transistor, a third MOS transistor, a fourth triode, and a fifth triode, one of the two ends of the primary side of the second voltage device is connected to the analog voice output and the other end is connected to the ground through a fifteenth resistor, one of the two ends of the secondary side of the second voltage device is connected to the positive terminal of the voice output of the device through a tenth capacitor and the other end is connected to the negative terminal of the voice output of the device, and the connection ends of the second voltage device and the fifteenth resistor are respectively connected to the drain electrode of the second MOS transistor and the drain electrode of the third MOS transistor; the source electrode of the third MOS tube is connected with the ground wire, the grid electrode of the third MOS tube is connected with the system power supply through a twenty-fourth resistor and is connected with the collector electrode of a fifth triode, the base electrode of the fifth triode is connected with the low-frequency calling control end of the controller and is connected with the ground wire through a forty-fifth resistor, and the emitter electrode of the fifth triode is connected with the ground wire, so that a low-level triggering calling ringing control circuit is formed; the source electrode of second MOS pipe is through twenty first resistance and intercom power interface connection, and twenty first resistance still is connected with the ground wire through eighteenth electric capacity with intercom power interface connection end, the source electrode of second MOS pipe still is connected with the grid of second MOS pipe through thirteenth resistance, the grid of second MOS pipe is connected with the collecting electrode of fourth triode, the base of fourth triode is connected with the high frequency calling party control end of controller and still is connected with the ground wire through twenty seventh resistance and nineteenth electric capacity respectively, the projecting pole of fourth triode is connected with the ground wire to form high level trigger calling party ringing control circuit.

Preferably, the second voltage regulator specification is 1:1, 2.2 uH.

Compared with the prior art, the utility model, its beneficial effect lies in:

the utility model discloses the controller detects and trigger mode detection circuitry and intercom inserts detection circuitry's detection signal control calling party's ringing trigger circuit through the called party and controls the intercom, can save the cost, realizes automated inspection, improves the reliability. The utility model can reduce the equipment volume, reduce the material types and reduce the cost of the PCB, the shell and the die; meanwhile, a special single chip microcomputer is omitted, and software development time and cost are reduced. The utility model discloses in through realizing plug automated inspection, detect the level of two kinds of types of high-low level and trigger the intercom and carry out automatic identification, then according to the result self-adaptation of discernment accomplish called detection and calling party ringing function, need not artifical judgement and go to set up dial switch and set for the intercom type, avoided workman's field erection misoperation to cause the risk of damaging, doing over again for equipment, improved the installation effectiveness, improved equipment reliability.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a schematic circuit diagram of the insertion detection circuit of the intercom of the present invention;

fig. 3 is a schematic circuit diagram of the detection circuit for detecting a called party and triggering a mode according to the present invention;

fig. 4 is a schematic diagram of a circuit structure of the calling ring trigger circuit of the present invention;

Detailed Description

The present invention will be further described with reference to the following examples, which are not intended to limit the scope of the invention, but are intended to be within the scope of the claims.

As shown in fig. 1 to 4, the present invention provides a called detection and calling ring circuit of a level triggered interphone, which comprises a controller 1 and an interphone 5, and further comprises an interphone plug-in detection circuit 4 respectively connected with an interphone power interface VOICE _12VIN of the interphone 5 and the controller 1, a called detection and trigger mode detection circuit 2 respectively connected with an analog VOICE input interface Y of the interphone 5 and the controller 1 for detecting the called and level triggered types of the interphone 5, and a calling ring trigger circuit 3 connected to the analog voice output K of the interphone 5 and the controller 1 for triggering and controlling the calling ring of the interphone 5 according to the detection signal of the called detection and trigger mode detection circuit 2, wherein the called detection and trigger mode detection circuit 2, the calling ring trigger circuit 3 and the interphone plug-in detection circuit 4 are also connected to a system power VMTG _ VDD3V 3. The system power VMTG _ VDD3V3 is dc 3.3V.

The interphone plug-in detection circuit 4 comprises a sixth triode Q6, a twenty-fifth resistor R25 and a twenty-sixth resistor R26, wherein the base of the sixth triode Q6 is connected with an interphone power interface VOICE _12VIN through the twenty-sixth resistor R26, the collector of the sixth triode Q6 is connected with the plug-in detection end INSERT _ DETECT of the controller 1 and is also connected with a system power VMTG _ VDD3V3 through the twenty-fifth resistor R25, and the emitter of the sixth triode Q6 is connected with the ground wire.

In the present embodiment, the controller 1 is a CPU. And the interphone power interface VOICE _12VIN is direct current 12V. When the interphone 5 is inserted, the interphone power interface VOICE _12VIN inputs a high level, and the insertion detection terminal INSERT _ DETECT receives a low level interrupt signal; when the interphone 5 is pulled out or not plugged in, the interphone power interface VOICE _12VIN inputs a low level, and the plug-in detection terminal INSERT _ DETECT receives a high level interrupt signal, so that the interphone 5 performs plug-in detection.

The called detection and trigger mode detection circuit 2 comprises a first transformer T1 and a first triode Q1, wherein two primary sides of the first transformer T1 are respectively connected with a microphone input positive terminal LTE _ MIC _ P and a microphone input negative terminal LTE _ MIC _ N, one secondary side of the first transformer T1 is connected with an analog voice input interface Y and the other secondary side thereof is connected with a ground line sequentially through a nineteenth resistor R19 and a tenth resistor R10, a connection end between the nineteenth resistor R19 and the tenth resistor R10 is connected with a base of the first triode Q1, a collector of the first triode Q1 is connected with a called detection terminal CALL _ detectt of the controller 1 and is also connected with a system power supply VMTG _ VDD3V3 through an eighth resistor R8, and an emitter of the first triode Q1 is connected with the ground line. The first transformer T1 has the specification of 1:1, 2.2 uH.

In this embodiment, when the intercom 5 is a high-level trigger intercom, a call is made by loading a high-level digital pulse signal on the analog voice input interface Y, and the analog voice input interface Y remains at a low level during standby. When the interphone 5 is a low-level trigger type interphone, a low-level digital pulse signal is loaded on the analog voice input interface Y to make a call, and the analog voice input interface Y maintains a high level during standby. When the interphone plug-in detection circuit 4 judges that the interphone is plugged in, and the called detection terminal CALL _ DETECT of the controller 1 receives a high level, it indicates that the interphone 5 is a low level trigger interphone; on the contrary, the called detection terminal CALL _ DETECT of the controller 1 receives a low level, which indicates that the interphone 5 is a high-level trigger type interphone. By utilizing the characteristics of the first transformer T1 of 1:1, 2.2uH, the analog voice signal is transmitted to the rear stage through the first transformer T1 without attenuation, and the direct-current voltage is separated from the analog voice input interface Y by utilizing the characteristics of single-ended high inductance, so that the analog signal is prevented from being isolated by using a single large inductor, and meanwhile, the noise is reduced, so that when the microphone input signal is connected with an audio codec chip for receiving the voice signal input by the interphone 5, the receiving quality can be effectively improved; thereby reducing cost and operational stability.

In this embodiment, the called detection is realized by the detection signal of the called detection terminal CALL _ DETECT. After the trigger type of the interphone 5 is automatically identified, if the interphone 5 is a low-level trigger type interphone, the interphone 5 starts to talk, and the equipment circuit is used as a called party, then a called detection terminal CALL _ DETECT signal jumps from low to high; on the contrary, if the interphone 5 is a high-level trigger interphone, the called detection terminal CALL _ DETECT signal jumps from high to low; therefore, the called input is indicated through the jump of the called detection terminal CALL _ DETECT signal, and the called detection is realized.

The calling ring trigger circuit 3 comprises a second voltage device T2, a second MOS transistor Q2, a third MOS transistor Q3, a fourth triode Q4 and a fifth triode Q5, wherein one end of two primary sides of the second voltage device T2 is connected with the analog voice output K and the other end is connected with the ground through a fifteenth resistor R15, one end of two secondary sides of the second voltage device T2 is connected with the device voice output positive electrode terminal LTE _ SPK _ P through a tenth capacitor C10 and the other end is connected with the device voice output negative electrode terminal LTE _ SPK _ N, and connection ends of the second voltage device T2 and the fifteenth resistor R15 are respectively connected with the drain electrode of the second MOS transistor Q2 and the drain electrode of the third MOS transistor Q3; the source of the third MOS transistor Q3 is connected to the ground, the gate of the third MOS transistor Q3 is connected to the system power VMTG _ VDD3V3 through a twenty-four resistor and to the collector of the fifth transistor Q5, the base of the fifth transistor Q5 is connected to the low-frequency calling control terminal RING _ L of the controller 1 and to the ground through a forty-five resistor R45, and the emitter of the fifth transistor Q5 is connected to the ground, so as to form a low-level triggered calling ringing control circuit; the source of the second MOS transistor Q2 is connected to the intercom power interface VOICE _12VIN through a twenty-first resistor R21, the connection end of the twenty-first resistor R21 and the intercom power interface VOICE _12VIN is further connected to the ground through an eighteenth capacitor C18, the source of the second MOS transistor Q2 is further connected to the gate of the second MOS transistor Q2 through a thirteenth resistor R23, the gate of the second MOS transistor Q2 is connected to the collector of the fourth transistor Q4, the base of the fourth transistor Q4 is connected to the high-frequency calling control terminal RING _ H of the controller 1 and is further connected to the ground through a twenty-seventh resistor R27 and a nineteenth capacitor C19, respectively, and the emitter of the fourth transistor Q4 is connected to the ground, thereby forming a high-level triggering calling control circuit. The specification of the second voltage device T2 is 1:1, 2.2 uH.

In this embodiment, the interphone is called through the high-frequency calling control end RING _ H and the low-frequency calling control end RING _ L of the controller 1, so that the analog voice output K outputs a high pulse level to RING the interphone, thereby realizing calling ringing. After the trigger type of the interphone 5 is automatically identified, if the interphone 5 is of a high-level trigger type, when the interphone 5 is in conversation, the high-frequency calling control end RING _ H outputs high level, the low-frequency calling control end RING _ L outputs low level, and high-level pulse is output on the analog voice output K, so that the interphone RINGs, and the conversation can be realized after off-hook; if the interphone 5 is of a low-level trigger type, when the interphone is communicated with the interphone, the high-frequency calling control end RING _ H is output to be low, the low-frequency calling control end RING _ L is output to be high, and low-level pulses are output on the analog voice output K, so that the interphone RINGs, and the interphone can communicate after being picked up; therefore, the self-adaptive calling ringing of the two types of interphones triggered by the high and low levels is realized, and the dial switch does not need to be manually configured.

The above is only a preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility of the invention and the utility of the patent.

Claims

1. The utility model provides a called detection and calling ringing circuit of level trigger type intercom, includes controller (1) and intercom (5), its characterized in that: also comprises an interphone plug-in detection circuit (4) respectively connected with an interphone power interface (VOICE _12VIN) of the interphone (5) and the controller (1), a called detection and trigger mode detection circuit (2) respectively connected with an analog VOICE input interface (Y) of the interphone (5) and the controller (1) and used for detecting the called and level trigger types of the interphone (5), and a calling ring trigger circuit (3) respectively connected with the analog voice output (K) of the interphone (5) and the controller (1) and used for triggering and controlling the calling ring of the interphone (5) according to the detection signal of the called detection and trigger mode detection circuit (2), the called detection and trigger mode detection circuit (2), the calling ring trigger circuit (3) and the interphone plug-in detection circuit (4) are also respectively connected with a system power supply (VMTG _ VDD3V 3).

2. The circuit of claim 1, wherein the circuit comprises: the interphone plug-in detection circuit (4) comprises a sixth triode (Q6), a twenty-fifth resistor (R25) and a twenty-sixth resistor (R26), the base of the sixth triode (Q6) is connected with an interphone power interface (VOICE _12VIN) through the twenty-sixth resistor (R26), the collector of the sixth triode (Q6) is connected with an plug-in detection end (INSERT _ DETECT) of the controller (1) and is also connected with a system power supply (VMTG _ VDD3V3) through the twenty-fifth resistor (R25), and the emitter of the sixth triode (Q6) is connected with the ground wire.

3. The called detection and calling ringing circuit of level triggered intercom according to claim 1 or 2, characterized in that: the system power supply (VMTG _ VDD3V3) is direct current 3.3V.

4. The circuit of claim 1, wherein the circuit comprises: the called detection and trigger mode detection circuit (2) comprises a first transformer (T1) and a first triode (Q1), the two ends of the primary side of the first transformer (T1) are respectively connected with the positive terminal (LTE _ MIC _ P) and the negative terminal (LTE _ MIC _ N) of the microphone input, one end of two secondary sides of the first transformer (T1) is connected with the analog voice input interface (Y) and the other end is connected with the ground wire through a nineteenth resistor (R19) and a tenth resistor (R10) in sequence, the connecting end between the nineteenth resistor (R19) and the tenth resistor (R10) is connected with the base electrode of the first triode (Q1), the collector of the first triode (Q1) is connected with a called detection terminal (CALL _ DETECT) of the controller (1) and is also connected with a system power supply (VMTG _ VDD3V3) through an eighth resistor (R8), and the emitter of the first triode (Q1) is connected with the ground wire.

5. The circuit of claim 4, wherein the circuit comprises: the first transformer (T1) is 1:1, 2.2uH in specification.

6. The circuit of claim 1, wherein the circuit comprises: the calling ring trigger circuit (3) comprises a second voltage transformer (T2), a second MOS tube (Q2), a third MOS tube (Q3), a fourth triode (Q4) and a fifth triode (Q5), one end of two primary sides of the second voltage transformer (T2) is connected with the analog voice output (K) and the other end is connected with the ground wire through a fifteenth resistor (R15), one end of two secondary sides of the second voltage transformer (T2) is connected with a device voice output positive electrode terminal (LTE _ SPK _ P) through a tenth capacitor (C10) and the other end is connected with a device voice output negative electrode terminal (LTE _ SPK _ N), and connecting ends of the second voltage transformer (T2) and the fifteenth resistor (R15) are respectively connected with a drain electrode of the second MOS tube (Q2) and a drain electrode of the third MOS tube (Q3); the source of the third MOS tube (Q3) is connected with the ground wire, the gate of the third MOS tube (Q3) is connected with the system power supply (VMTG _ VDD3V3) through a twenty-four resistor and is connected with the collector of a fifth triode (Q5), the base of the fifth triode (Q5) is connected with the low-frequency calling control terminal (RING _ L) of the controller (1) and is connected with the ground wire through a forty-five resistor (R45), and the emitter of the fifth triode (Q5) is connected with the ground wire, so that a low-level triggering calling ringing control circuit is formed; the source of the second MOS transistor (Q2) is connected with the intercom power interface (VOICE _12VIN) through a twenty-first resistor (R21), the connection end of the twenty-first resistor (R21) and the intercom power interface (VOICE _12VIN) is further connected with the ground through an eighteenth capacitor (C18), the source of the second MOS transistor (Q2) is further connected with the gate of the second MOS transistor (Q2) through a twenty-third resistor (R23), the gate of the second MOS transistor (Q2) is connected with the collector of a fourth triode (Q4), the base of the fourth triode (Q4) is connected with the high-frequency calling control end (RING _ H) of the controller (1) and is further connected with the ground through a twenty-seventh resistor (R27) and a nineteenth capacitor (C19), respectively, and the emitter of the fourth triode (Q4) is connected with the ground, so as to form a high-level triggered ringing control circuit.

7. The circuit of claim 6, wherein the circuit comprises: the specification of the second voltage device (T2) is 1:1, 2.2 uH.