CN112299169B - An elevator shaft signal transmission device and an elevator - Google Patents

Abstract

The embodiment of the invention discloses an elevator shaft signal transmission device. The device comprises: the power line communication module is electrically connected with the elevator car load, and is respectively electrically connected with the power line communication module electrically connected with the first machine room power supply and the camera, and is used for converting the received audio and video signals into power line signals and transmitting the power line signals to the power line communication module electrically connected with the first machine room power supply; the power line communication module is electrically connected with the first machine room power supply, is electrically connected with the power line communication module electrically connected with the second machine room power supply, and is used for switching the power line signals into audio and video signals and transmitting the audio and video signals to the power line communication module electrically connected with the second machine room power supply; and the power line communication module electrically connected with the second machine room power supply is used for feeding back the audio and video signals to the display equipment. The technical scheme of the embodiment of the invention realizes stable and efficient guarantee of signal transmission in the elevator shaft.

Description

An elevator shaft signal transmission device and an elevator

technical field

Embodiments of the present invention relate to the technical field of power line carrier communication, in particular to an elevator shaft signal transmission device and an elevator.

Background technique

At present, power line carrier communication (PLC) technology is widely used in the transmission of elevator video, audio and other signals. This transmission method can not only save network costs, the line is not easy to be damaged, and it is easy to maintain. However, there are many interference signals in the hoistway line, for example, the interference of power frequency mains 50Hz, the interference caused by high-frequency switching power switching devices 100KHz-1MHz, the interference of IGBT switching of motor inverter 8KHz-20KHz, the interference of elevator door machine switching process 10KHz -20KHz etc.

The bandwidth of the power line carrier communication module will be greatly reduced during the signal transmission process of the cable in the hoistway, which cannot meet the signal transmission of one-to-many bus mode. At present, the filter circuit of the common power line carrier communication module is difficult to filter Eliminate interference in the well.

Contents of the invention

Embodiments of the present invention provide an elevator shaft signal transmission device and an elevator, so as to realize stable and efficient signal transmission in the elevator shaft.

In a first aspect, an embodiment of the present invention provides an elevator shaft signal transmission device, the elevator shaft signal transmission device includes:

Elevator car load, power line communication module electrically connected to elevator car load, first machine room power supply, power line communication module electrically connected to first machine room power supply, second machine room power supply, power line communication module electrically connected to second machine room power supply , an elevator hall call module, a power line communication module electrically connected to the elevator hall call module, a camera and a display device;

The power line communication module electrically connected to the load of the elevator car is electrically connected to the power line communication module electrically connected to the power supply of the first machine room and the camera respectively, and is used to convert the received audio and video signals into power line signals, and transmitting the power line signal to the power line communication module electrically connected to the power supply of the first computer room;

The power line communication module electrically connected to the power supply of the first computer room is electrically connected to the power line communication module electrically connected to the power supply of the second computer room, and is used to switch the power line signal into the audio and video signal, and transmit the Audio and video signals are transmitted to the power line communication module electrically connected to the power supply of the second computer room;

The power line communication module electrically connected to the power supply of the second machine room is electrically connected to the power line communication module electrically connected to the elevator hall call module and the display device respectively, and is used to feed back the audio and video signals to the display equipment.

Further, the power line communication module includes a conversion circuit, a filter circuit, a switching power supply and an isolation unit;

The conversion circuit is electrically connected to the switching power supply, the filter circuit is electrically connected to the isolation unit, and the isolation unit is electrically connected to the switching power supply.

Further, the network port of the power line communication module is electrically connected to the conversion circuit, the first interface of the power line communication module is electrically connected to the first end of the filter circuit, and the second interface of the power line communication module is respectively connected to the The second end of the filter circuit is electrically connected to the isolation unit.

Further, the elevator car load is electrically connected to the first interface of the power line communication module electrically connected to the elevator car load, and the second interface of the power line communication module electrically connected to the elevator car load is connected to the The second interface of the power line communication module electrically connected to the power supply of the first computer room is electrically connected, and the first interface of the power line communication module electrically connected to the power supply of the first computer room is electrically connected to the power supply of the first computer room;

The network port of the power line communication module electrically connected to the power supply of the first machine room is electrically connected to the network port of the power line communication module electrically connected to the power supply of the second machine room, and the network port of the power line communication module electrically connected to the elevator car load The network port is electrically connected to the camera, and the network port of the power line communication module electrically connected to the elevator hall call module is electrically connected to the display device;

The elevator hall call module is electrically connected to the first interface of the power line communication module electrically connected to the elevator hall call module, and the second interface of the power line communication module electrically connected to the elevator hall call module is connected to the second interface of the power line communication module. The second interface of the power line communication module electrically connected to the power supply of the computer room is electrically connected, and the first interface of the power line communication module electrically connected to the power supply of the second computer room is electrically connected to the power supply of the second computer room.

Further, the conversion circuit includes a main control chip, a simulator front end, an output filter circuit, an input filter circuit, a coupling transformer and a memory;

The main control chip is electrically connected to the emulator front end and the memory respectively, the emulator front end is electrically connected to the output filter circuit and the input filter circuit respectively, and the output filter circuit and the input filter circuit are electrically connected to each other. The circuits are respectively electrically connected to the coupling transformers.

Further, the coupling transformer is electrically connected to the filter circuit and the isolation unit respectively;

The switching power supply is electrically connected to the main control chip and the emulator front end respectively.

Further, the filter circuit includes a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a power resistor;

The first inductor and the second inductor are connected in parallel to both ends of the first capacitor, the first capacitor is connected in parallel to both ends of the third inductor, and the second capacitor and the power resistor are respectively connected in parallel At both ends of the third inductor, the third capacitor and the fourth capacitor are connected in parallel to both ends of the third inductor after being connected in series.

Further, the first inductor and the second inductor are differential mode inductors, and the third inductor is a common mode inductor;

The first capacitor and the second capacitor are film capacitors, and the third capacitor and the fourth capacitor are ceramic capacitors.

Further, the power supply of the first machine room is electrically connected to the load of the elevator car through a first cable, and is used to provide power for the load of the elevator car;

The second machine room power supply is electrically connected to the elevator hall call module through a second cable, and is used to provide power for the elevator hall call module;

The power line communication module electrically connected to the power supply of the first computer room is electrically connected to the power line communication module electrically connected to the power supply of the second computer room through a network cable.

In the second aspect, the embodiment of the present invention further provides an elevator, which includes the elevator shaft signal transmission device provided in the embodiment of the first aspect of the present invention.

According to the technical solution of the embodiment of the present invention, the elevator shaft signal transmission device includes: an elevator car load, a power line communication module electrically connected to the elevator car load, a first machine room power supply, a power line communication module electrically connected to the first machine room power supply, The second machine room power supply, the power line communication module electrically connected to the second machine room power supply, the elevator hall call module, the power line communication module electrically connected to the elevator hall call module, the camera and the display device; the power line electrically connected to the elevator car load The communication module is respectively connected to the power line communication module electrically connected to the power supply of the first computer room and the camera, and is used to convert the received audio and video signals into power line signals, and transmit the power line signals to the The power line communication module electrically connected to the power supply of the first computer room; the power line communication module electrically connected to the power supply of the first computer room is electrically connected to the power line communication module electrically connected to the power supply of the second computer room, and is used to switch the power line signal for the audio and video signals, and transmit the audio and video signals to the power line communication module electrically connected to the power supply of the second machine room; the power line communication module electrically connected to the power supply of the second machine room is respectively connected to the elevator The power line communication module electrically connected to the hall call module is electrically connected to the display device, and is used to feed back the audio and video signals to the display device. It solves the problems of difficult filtering of signal interference in the hoistway and poor signal transmission stability in the prior art, so as to realize stable and efficient signal transmission in the elevator hoistway.

Description of drawings

Fig. 1 is a schematic structural diagram of an elevator shaft signal transmission device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a power line communication module provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a filter circuit provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe various operations (or steps) as sequential processing, many of the operations may be performed in parallel, concurrently, or simultaneously. In addition, the order of operations can be rearranged. The process may be terminated when its operations are complete, but may also have additional steps not included in the figure. The processing may correspond to a method, function, procedure, subroutine, subroutine, or the like.

Fig. 1 is a schematic structural diagram of an elevator shaft signal transmission device provided by an embodiment of the present invention. This embodiment is applicable to the case of transmitting audio and video signals in the elevator shaft.

The concrete structure of this elevator shaft signal transmission device comprises as follows:

The elevator car load 110, the power line communication module 120 electrically connected to the elevator car load, the first machine room power supply 130, the power line communication module 120 electrically connected to the first machine room power supply, the second machine room power supply 140, and the second machine room power supply Connected power line communication module 120, elevator hall call module 150, power line communication module 120 electrically connected to the elevator hall call module, camera and display device;

The power line communication module 120 electrically connected to the elevator car load 110 is electrically connected to the power line communication module 120 electrically connected to the first machine room power supply 130 and the camera, respectively, for converting received audio and video signals into power lines signal, and transmit the power line signal to the power line communication module 120 electrically connected to the first computer room power supply 130;

The power line communication module 120 electrically connected to the first computer room power supply 130 is electrically connected to the power line communication module 120 electrically connected to the second computer room power supply 140 for switching the power line signal into the audio and video signal, and transmit the audio and video signals to the power line communication module 120 electrically connected to the second computer room power supply 140;

The power line communication module 120 electrically connected to the second machine room power supply 140 is electrically connected to the power line communication module 120 electrically connected to the elevator hall call module 150 and the display device, respectively, for feeding back the audio and video signals to the display device.

Wherein, the elevator car load 110 may be equipment such as door operators, buttons, sensors, and intercoms in the car.

The camera can be any device capable of capturing video or images in the prior art, such as an infrared camera or a high-definition camera, and this embodiment does not impose any limitation on the specific type of the camera.

The elevator hall call module 150 is used to display the floor the elevator is currently running to and the call button for going up and down when taking the elevator. It is installed on the exterior call part of each floor where the elevator can stay. The number of call parts is determined by the actual floor of the building where the elevator is located. This embodiment only describes the specific functions of the elevator hall call module 150 without any limitation on its number or other specific forms.

The display device can be integrated inside the elevator hall call module 150, or can be independent of the elevator hall call module 150 (that is, as shown in FIG. 1 at this time). In this embodiment, the specific type of the display device is not limited in any way, and it can be any device in the prior art that realizes image or video display functions, and the display device has a network port that can be used for a network cable, for example, a display screen, a video camera, etc. and other equipment.

Specifically, one end of the power line communication module 120 in the elevator car is connected to the load 110 of the elevator car. The power line communication module 120 in the elevator car is used to convert the Ethernet signal into a power line signal, and the other end is equipped with a DC cable in the hoistway ( Optionally, the DC cable can be 24V or 48V) to transmit audio and video signals into the machine room, and the power line communication module 120 in the machine room is equipped with a DC cable of the machine room power supply to transmit the audio and video signals to the elevator hall call module 150, that is, In the hall call part of each floor corresponding to the elevator hall call module 150, the power line communication module 120 in the machine room is used to convert the power line signal into an Ethernet signal.

Further, the hall call part of the elevator on each floor may include a display device, which can be used to display the monitoring information in the car at any time. At the same time, the waiting personnel outside the hall can know the internal situation of the car at any time through the display device. However, the method of multi-layer external call bus simultaneously obtains the monitoring information in the car, which is equivalent to distributing fixed-bandwidth data to multiple floors. The data bandwidth obtained by each floor is relatively small, which will cause video delay, freeze or drop. Therefore, it is necessary to design a reasonable filter circuit to filter out the interference in the line, which can increase the total bandwidth of the transmission line, and the bandwidth allocated to each floor will increase accordingly. The specific filtering method will be described in detail below.

Continuing to refer to FIG. 1 , on the basis of the above embodiments, the first machine room power supply 130 is electrically connected to the elevator car load 110 through a first cable, and is used to provide power for the elevator car load 110;

The second machine room power supply 140 is electrically connected to the elevator hall call module 150 through a second cable, and is used to provide power for the elevator hall call module 150;

The power line communication module 120 electrically connected to the first computer room power supply 130 is electrically connected to the power line communication module 120 electrically connected to the second computer room power supply 140 through a network cable.

Specifically, the power supply in the machine room is divided into two circuits. The first machine room power supply 130 enters the elevator car through the first cable for use by the elevator car load 110 in the car, and the second machine room power supply 140 enters the elevator hall call through the second cable. Module 150, that is, enter each floor for use by the hall call part.

Whether it is the first cable channel or the second cable channel, the signal is transmitted between the conversion module parts of the two power line communication modules 120, and the two power line communication modules 120 always filter the external interference through their respective low-pass filters. Except in the transmission line, ensure that the transmission line signal is relatively clean.

After the high-frequency interference signal on the first machine room power supply 130 in the machine room passes through the low-pass filter of the power line communication module 120 electrically connected with the first machine room power supply 130, most of the interference signals are filtered out. The low-pass filter of the power line communication module 120 to which the elevator car load 110 is electrically connected is also filtered out, so that the circuit between the two conversion modules can keep the signal relatively clean. The signals transmitted by the power line communication module 120 can be less subject to external interference, and the signals can be transmitted stably and efficiently. Similarly, in the second cable, the power line communication module 120 electrically connected to the second machine room power supply 140 and the low-pass filter of the power line communication module 120 electrically connected to the elevator hall call module 150 respectively connect the second machine room power supply 140 and the outside The interference signal of the call board is filtered out of the transmission channel of the second cable to ensure that the signal transmission of the second cable is relatively clean, so that the entire transmission channel can transmit both power and signals, and can ensure that the entire transmission path channel signal is relatively clean. clean.

FIG. 2 is a schematic structural diagram of a power line communication module 120 provided by an embodiment of the present invention. Referring to FIG. 2, on the basis of the above embodiments, the power line communication module 120 includes a conversion circuit 121, a filter circuit 122, a switching power supply 123 and an isolation unit 124;

The conversion circuit 121 is electrically connected to the switching power supply 123 , the filter circuit 122 is electrically connected to the isolation unit, and the isolation unit is electrically connected to the switching power supply 123 .

Specifically, the conversion circuit 121, the filter circuit 122, the switching power supply 123 and the isolation unit 124 contained in the power line communication module 120 are all electrically connected through a power line, and the power line can be used to transmit power energy or signal.

The filter circuit 122 may adopt a low-pass filter, which mainly suppresses external interference and prevents crosstalk from affecting power line signal transmission.

The isolation unit 124 is mainly used to suppress the interference generated by the switching power supply 123 .

Continuing to refer to FIG. 2 , on the basis of the above embodiments, the network port of the power line communication module 120 is electrically connected to the switching circuit 121, and the first interface of the power line communication module 120 is connected to the first end of the filter circuit 122 The second interface of the power line communication module 120 is electrically connected to the second end of the filter circuit 122 and the isolation unit 124 respectively.

Continue referring to Fig. 1 and Fig. 2, on the basis of the above embodiment, the elevator car load 110 is electrically connected to the first interface of the power line communication module 120 electrically connected to the elevator car load 110, and the elevator car load 110 is electrically connected to the first interface of the power line communication module 120. The second interface of the power line communication module 120 electrically connected to the car load 110 is electrically connected to the second interface of the power line communication module 120 electrically connected to the first machine room power supply 130, and the power line electrically connected to the first machine room power supply 130 The first interface of the communication module 120 is electrically connected to the first computer room power supply 130;

The network port of the power line communication module 120 electrically connected to the first machine room power supply 130 is electrically connected to the network port of the power line communication module 120 electrically connected to the second machine room power supply 140, and the network port electrically connected to the elevator car load The network port of the power line communication module is electrically connected to the camera, and the network port of the power line communication module electrically connected to the elevator hall call module is electrically connected to the display device;

The elevator hall call module 150 is electrically connected to the first interface of the power line communication module 120 electrically connected to the elevator hall call module 150, and the second interface of the power line communication module 120 electrically connected to the elevator hall call module 150 is connected to the The second interface of the power line communication module 120 electrically connected to the second computer room power supply 140 is electrically connected, and the first interface of the power line communication module 120 electrically connected to the second computer room power supply 140 is electrically connected to the second computer room power supply 140. connect.

Continuing to refer to FIG. 2, on the basis of the foregoing embodiments, the conversion circuit 121 includes a main control chip, a simulator front end, an output filter circuit, an input filter circuit, a coupling transformer and a memory;

The main control chip is electrically connected to the emulator front end and the memory respectively, the emulator front end is electrically connected to the output filter circuit and the input filter circuit respectively, and the output filter circuit 122 is electrically connected to the input filter circuit 122. The filter circuits are electrically connected to the coupling transformers respectively.

Continuing to refer to FIG. 2 , on the basis of the above embodiment, the coupling transformer is electrically connected to the filter circuit 122 and the isolation unit 124 respectively;

The switching power supply 123 is electrically connected to the main control chip and the emulator front end respectively.

Specifically, the conversion circuit 121 of the power line transmission module is connected between the elevator car load 110 and the network port of the power line communication module 120 electrically connected to the elevator car load 110, and transmits audio and video signals to the main control chip. The digital/analog is transmitted to the front end of the simulator, after the amplification of the front end of the simulator, the filtering of the output filter circuit and the coupling transformer to the power line to realize the conversion and transmission of the signal. The coupling transformer at the receiving end couples the high-frequency signal loaded on the power cable to the input filter circuit, transmits it to the main control chip through the front end of the simulator and analog-to-digital conversion, and then transmits it to the display module of the elevator hall call module 150 through the network port .

The memory is mainly used to store the program. After the elevator shaft signal transmission device is powered on, the main control chip starts the program in the memory to continuously realize the conversion of the Ethernet signal and the power line carrier signal. Further, the isolation capacitors C1 and C2 use high withstand voltage ceramic capacitors to isolate the power supply, preventing external high voltage from damaging the coupling transformer.

FIG. 3 is a schematic structural diagram of a filter circuit provided by an embodiment of the present invention. Referring to FIG. 3 , on the basis of the foregoing embodiments, the filter circuit 122 includes a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a power resistor;

The first inductor and the second inductor are connected in parallel to both ends of the first capacitor, the first capacitor is connected in parallel to both ends of the third inductor, and the second capacitor and the power resistor are respectively connected in parallel At both ends of the third inductor, the third capacitor and the fourth capacitor are connected in parallel to both ends of the third inductor after being connected in series.

Specifically, the filter circuit 122 uses the low-pass LC filter circuit 122 as the basic structure, and uses the multi-stage filter circuit 122 to ensure that the DC signal and low-frequency signal components in the cable can pass through the cable smoothly, while the high-frequency signal outside the power line communication module 120 is blocked from the transmission cable.

On the basis of the above embodiment, the first inductor and the second inductor are differential mode inductors, and the third inductor is a common mode inductor;

The first capacitor and the second capacitor are film capacitors, and the third capacitor and the fourth capacitor are ceramic capacitors.

Specifically, the film capacitor and the ceramic capacitor are all safety capacitors, and the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are all safety capacitors.

In this embodiment, the third inductor L3, the third capacitor C3, and the fourth capacitor C4 form a common-mode LC filter circuit 122, which mainly filters out the common-mode interference signal to ground in the line; the first inductor L1, the second inductor L2 Form a differential mode LC filter circuit 122 with the first capacitor C1 and the second capacitor C2, and filter the differential mode signal between the positive and negative poles of the 24V (or 48V) power supply; the first capacitor C1, the third inductor L3 and the second Capacitor C2 constitutes a Π-shaped filter circuit 122, which can better suppress the noise on the power supply side.

The resistance value of the power resistor should be as large as possible. Its main function is to discharge and consume the electric energy stored in the inductor and capacitor after the line is powered off, so as to prevent the board from being charged after the system is powered off. The low-pass filter circuit 122 is integrated on the power line communication module 120. The filter circuit 122 isolates external interference from the outside of the conversion circuit 121 .

The embodiment of the present invention also provides an elevator, which includes the elevator shaft signal transmission device provided by the embodiment of the present invention.

According to the technical solution of the embodiment of the present invention, the elevator shaft signal transmission device includes: an elevator car load, a power line communication module electrically connected to the elevator car load, a first machine room power supply, a power line communication module electrically connected to the first machine room power supply, The second machine room power supply, the power line communication module electrically connected to the second machine room power supply, the elevator hall call module, the power line communication module electrically connected to the elevator hall call module, the camera and the display device; the power line electrically connected to the elevator car load The communication module is electrically connected to the power line communication module electrically connected to the power supply of the first computer room and the camera, and is used to convert the received audio and video signals into power line signals, and transmit the power line signals to the The power line communication module electrically connected to the power supply of the first computer room; the power line communication module electrically connected to the power supply of the first computer room is electrically connected to the power line communication module electrically connected to the power supply of the second computer room, and is used to switch the power line signal for the audio and video signals, and transmit the audio and video signals to the power line communication module electrically connected to the power supply of the second machine room; the power line communication module electrically connected to the power supply of the second machine room is respectively connected to the elevator The power line communication module electrically connected to the hall call module is electrically connected to the display device, and is used to feed back the audio and video signals to the display device. It solves the problems of difficult filtering of signal interference in the hoistway and poor signal transmission stability in the prior art, so as to realize stable and efficient signal transmission in the elevator hoistway.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (9)

1. An elevator hoistway signal transmission apparatus, comprising:

the elevator car load comprises an elevator car load, a power line communication module electrically connected with the elevator car load, a first machine room power supply, a power line communication module electrically connected with the first machine room power supply, a second machine room power supply, a power line communication module electrically connected with the second machine room power supply, an elevator external calling module, a power line communication module electrically connected with the elevator external calling module, a camera and display equipment, wherein the elevator car load comprises a door machine, a button, a sensor or an interphone in the car;

the power line communication module electrically connected with the elevator car load is respectively electrically connected with the power line communication module electrically connected with the first machine room power supply and the camera, and is used for converting the received audio and video signals into power line signals and transmitting the power line signals to the power line communication module electrically connected with the first machine room power supply;

the power line communication module electrically connected with the first machine room power supply is electrically connected with the power line communication module electrically connected with the second machine room power supply, and is used for switching the power line signals into the audio and video signals and transmitting the audio and video signals to the power line communication module electrically connected with the second machine room power supply;

the power line communication module electrically connected with the power supply of the second machine room is electrically connected with the power line communication module electrically connected with the elevator calling module and the display equipment respectively and is used for feeding back the audio and video signals to the display equipment;

the power line communication module comprises a conversion circuit, a filter circuit, a switching power supply and an isolation unit;

the conversion circuit is electrically connected with the switch power supply, the filter circuit is electrically connected with the isolation unit, and the isolation unit is electrically connected with the switch power supply.

2. The elevator hoistway signal transmission device according to claim 1, wherein a network port of the power line communication module is electrically connected to a conversion circuit, a first interface of the power line communication module is electrically connected to a first end of the filter circuit, and a second interface of the power line communication module is electrically connected to a second end of the filter circuit and the isolation unit, respectively.

3. The elevator hoistway signal transmission apparatus of claim 2, wherein the elevator car load is electrically connected to a first interface of the power line communication module electrically connected to the elevator car load, a second interface of the power line communication module electrically connected to the elevator car load is electrically connected to a second interface of the power line communication module electrically connected to the first machine room power supply, and the first interface of the power line communication module electrically connected to the first machine room power supply is electrically connected to the first machine room power supply;

the network port of the power line communication module electrically connected with the first machine room power supply is electrically connected with the network port of the power line communication module electrically connected with the second machine room power supply, the network port of the power line communication module electrically connected with the elevator car load is electrically connected with the camera, and the network port of the power line communication module electrically connected with the elevator external calling module is electrically connected with the display equipment;

the elevator external calling module is electrically connected with a first interface of a power line communication module electrically connected with the elevator external calling module, a second interface of the power line communication module electrically connected with the elevator external calling module is electrically connected with a second interface of the power line communication module electrically connected with a second machine room power supply, and the first interface of the power line communication module electrically connected with the second machine room power supply is electrically connected with the second machine room power supply.

4. The hoistway signal transmission apparatus of claim 1, wherein the conversion circuit comprises a main control chip, a simulator front end, an output filter circuit, an input filter circuit, a coupling transformer, and a memory;

the main control chip is respectively electrically connected with the front end of the simulator and the memory, the front end of the simulator is respectively electrically connected with the output filter circuit and the input filter circuit, and the output filter circuit and the input filter circuit are respectively electrically connected with the coupling transformer.

5. The elevator hoistway signal transmission apparatus of claim 4, wherein the coupling transformer is electrically connected to the filter circuit and the isolation unit, respectively;

and the switching power supply is respectively electrically connected with the main control chip and the front end of the simulator.

6. The hoistway signal transmission apparatus of claim 1, wherein the filter circuit comprises a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a power resistor;

the first inductor and the second inductor are connected in parallel at two ends of the first capacitor, the first capacitor is connected in parallel at two ends of the third inductor, the second capacitor and the power resistor are respectively connected in parallel at two ends of the third inductor, and the third capacitor and the fourth capacitor are connected in series and then connected in parallel at two ends of the third inductor.

7. The elevator hoistway signal transmission apparatus of claim 6, wherein the first inductance and the second inductance are differential mode inductances, and the third inductance is a common mode inductance;

the first capacitor and the second capacitor are thin film capacitors, and the third capacitor and the fourth capacitor are ceramic capacitors.

8. The elevator hoistway signal transmission apparatus of claim 1, wherein the first machine room power source is electrically connected to the elevator car load by a first cable for providing power to the elevator car load;

the second machine room power supply is electrically connected with the elevator external calling module through a second cable and used for providing power for the elevator external calling module;

and the power line communication module electrically connected with the first machine room power supply is electrically connected with the power line communication module electrically connected with the second machine room power supply through a network cable.

9. An elevator characterized by comprising the elevator shaft signal transmission device according to any one of claims 1 to 8.

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