CN219678484U - Medium wave transmitter operation monitoring protection system based on wireless communication - Google Patents

Abstract

The utility model discloses a medium wave transmitter operation monitoring protection system based on wireless communication, which comprises a medium wave transmitter, and a power switching cabinet, a large UPS power supply, a fault monitoring module, a second wireless switching switch, a signal switching module and an upper computer which are electrically connected with the medium wave transmitter. The utility model realizes the detection of various key parameters of the medium wave transmitting system, when abnormality is detected, the system automatically carries out fault disposal and remote alarm, thereby widening the alarm range, avoiding the problem that the manual field disposal can delay time, improving the fault disposal efficiency and accelerating the fault disposal time.

Description

Medium wave transmitter operation monitoring protection system based on wireless communication

Technical field:

the utility model relates to the technical field of broadcasting equipment, in particular to a medium wave transmitter operation monitoring protection system based on wireless communication.

The background technology is as follows:

the medium wave broadcast is a radio broadcast with a carrier frequency in the medium wave band. Dividing according to international frequency band, the medium wave range is 300-3000 kilohertz (wavelength 100-1000 meters); the frequency range of medium wave broadcast is 525-1605 kilohertz. The transmission of medium waves takes two forms, ground waves and sky waves. In the daytime, the ground wave propagating along the earth surface is mainly used for transmission, and the electric wave is greatly attenuated and is relatively close in transmission distance due to the influence of the ground, but the transmission is stable, and the receiving effect is relatively good. The ionosphere is lower at night, and part of electric waves are reflected and transmitted by the ionosphere, so that the service range of the medium wave broadcasting at night is larger than that in the daytime.

The medium wave broadcasting system comprises a medium wave transmitter and related peripheral subsystems of the transmitter, wherein the medium wave transmitter comprises a signal source subsystem, a power distribution subsystem, an upper computer monitoring subsystem and an antenna feeder subsystem, and the stable and reliable operation of the subsystems is a precondition for guaranteeing the safe broadcasting of medium wave broadcasting. At present, the security broadcasting of medium wave broadcasting is mainly ensured by the field check-in of check-in machines and daily technical overhauling and maintenance, and if a transmitter or a related subsystem breaks down, an operator on duty needs technical treatment of the fault to ensure continuous broadcasting.

However, under certain special situations, some off-air accidents still exist only by means of daily technical maintenance and field personnel fault treatment, so that further technical support is needed to be upgraded so as to improve the real-time performance of the maintenance of the medium wave broadcasting system, the timeliness of the fault treatment and the broadcasting stability.

The utility model comprises the following steps:

the utility model aims to provide a medium wave transmitter operation monitoring protection system based on wireless communication so as to solve the defects in the prior art.

The utility model is implemented by the following technical scheme: the utility model provides a well ripples transmitter operation monitoring protection system based on wireless communication, includes well ripples transmitter and electric power switch cabinet, large-scale UPS power, fault monitoring module, second wireless change over switch, signal switch module, host computer that are connected with well ripples transmitter electricity, mains supply module, generator are connected to electric power switch cabinet input, large-scale UPS power is connected to mains supply module output, first wireless change over switch is connected to the generator input, fault monitoring module still is connected with host computer, wireless communication module electricity, wireless communication module and first wireless change over switch, wireless alarm, remote monitoring terminal, second wireless change over switch wireless communication connection, second wireless change over switch is connected with main spare matching module electricity, main spare matching module is connected with transmitting antenna electricity, signal switch module input is connected normal broadcasting signal source and emergency broadcasting signal source, the mains supply module still is connected the host computer through the electric energy acquisition terminal.

Further, the fault monitoring module comprises a controller, an incident power sampling module, a reflected power sampling module, a radio frequency current sampling module, a working voltage sampling module, a signal source detection module and a fault shutdown detection module which are electrically connected with the controller, wherein the controller is connected with the wireless communication module and the upper computer through communication interfaces.

Further, the large UPS power source is a UPS power source with a capacity exceeding Kva.

Further, the working voltage sampling module is a window comparison circuit based on an operational amplifier.

Furthermore, the signal source detection module is a balance-to-unbalance circuit based on an operational amplifier, and the output end of the operational amplifier is connected with a signal detection end based on an adjustable resistor.

Further, the fault shutdown detection module is a relay provided with two groups of normally open and normally closed contacts, wherein: one group of normally open contacts are respectively connected with the startup and shutdown detection end and the grounding end, and the other group of normally open contacts are respectively connected with the startup control relay and the power end; one group of normally closed contacts are respectively connected with the suspension end and the grounding end, and the other group of normally closed contacts are respectively connected with the suspension end and the power end.

Further, the first wireless transfer switch and the second wireless transfer switch are electronic switches based on 4G/5G, LORA or NB-IOT wireless communication.

Further, the wireless alarm is an alarm based on 4G/5G, LORA or NB-IOT wireless communication, and the remote monitoring terminal is a remote measuring and controlling terminal based on 4G/5G, LORA or NB-IOT wireless communication.

Further, the signal switching module is an audio matrix switcher.

Further, the wireless communication module is a 4G/5G communication module, a LORA communication module or an NB-IOT communication module.

The utility model has the advantages that:

the utility model realizes the detection of key parameters such as incident power, reflected power, radio frequency overcurrent, external voltage, working voltage, signal source, fault shutdown and the like of the medium wave transmitting system, and when one or a plurality of signals detect abnormality, the system automatically carries out fault disposal and remote alarm, thereby widening the alarm range, simultaneously avoiding the problem that the manual field disposal can delay time, improving the fault disposal efficiency, accelerating the fault disposal time and better ensuring the stability and reliability of broadcasting of broadcast signals.

Description of the drawings:

in order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic block diagram of a system for monitoring and protecting operation of a medium wave transmitter based on wireless communication according to an embodiment of the present utility model;

FIG. 2 is a schematic block diagram of a failure monitoring part of a medium wave transmitter operation monitoring protection system based on wireless communication according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of a circuit for detecting incident power, reflected power and radio frequency current signals of a medium wave transmitter operation monitoring protection system based on wireless communication according to an embodiment of the present utility model.

Fig. 4 is a schematic circuit diagram of an operating voltage sampling module of a medium wave transmitter operation monitoring protection system based on wireless communication according to an embodiment of the present utility model.

Fig. 5 is a schematic circuit diagram of a signal source detection module of a medium wave transmitter operation monitoring protection system based on wireless communication according to an embodiment of the present utility model.

Fig. 6 is a schematic circuit diagram of a fault shutdown detection module of a medium wave transmitter operation monitoring protection system based on wireless communication according to an embodiment of the present utility model.

The specific embodiment is as follows:

the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, the medium wave transmitter operation monitoring protection system based on wireless communication comprises a medium wave transmitter 1, a power switching cabinet 4 electrically connected with the medium wave transmitter 1, a large UPS power supply 5, a fault monitoring module 6, a second wireless switching switch 11, a signal switching module 13 and an upper computer 17, wherein the input end of the power switching cabinet 4 is connected with a mains supply module 2 and a generator 3, the output end of the mains supply module 2 is connected with the large UPS power supply 5, the input end of the generator 3 is connected with a first wireless switching switch 7, the fault monitoring module 6 is further electrically connected with the upper computer 17 and a wireless communication module 9, the wireless communication module 9 is in wireless communication connection with the first wireless switching switch 7, a wireless alarm 8, a remote monitoring terminal 10 and the second wireless switching switch 11, the second wireless switching switch 11 is electrically connected with a main and standby matching module 12, the main and standby matching module 12 is electrically connected with a transmitting antenna 14, the input end of the signal switching module 13 is connected with a normal broadcasting signal source 15 and an emergency broadcasting signal source 16, and the mains supply module 2 is further connected with the upper computer 17 through an electric energy collecting terminal 18.

The large UPS power source 5 is a UPS power source having a capacity exceeding 20 Kva. The load requirements of the current common 10KW transmitter and the transmitter with the power below the current common 10KW transmitter are met. The signal switching module 13 is an audio matrix switcher, which is a device in the prior art, and the model is not particularly limited, and the main function of the signal switching module is to realize adjustment and switching of different audio signal sources.

Meanwhile, the first wireless switch 7 and the second wireless switch 11 are electronic switches based on 4G/5G, LORA or NB-IOT wireless communication. The wireless alarm 8 is an alarm based on 4G/5G, LORA or NB-IOT wireless communication, and the remote monitoring terminal 10 is a remote measuring and controlling terminal based on 4G/5G, LORA or NB-IOT wireless communication. The wireless communication module 9 is a 4G/5G communication module, a LORA communication module or an NB-IOT communication module. These modules are all configured as wireless functions for the first time signal detection and alarm, as well as remote wireless fault handling.

As shown in fig. 2, the fault monitoring module 6 includes a controller 61, and an incident power sampling module 62, a reflected power sampling module 63, a radio frequency current sampling module 64, a working voltage sampling module 65, a signal source detecting module 66, and a fault shutdown detecting module 67 which are electrically connected with the controller 61, wherein the controller 61 is connected with the wireless communication module 9 and the upper computer 17 through communication interfaces.

As shown in fig. 3, specific circuits of the incident power sampling module 62, the reflected power sampling module 63, and the radio frequency current sampling module 64 are shown. The incident power sampling module 62 obtains an incident power output signal by sampling the incident voltage and the incident current and processing the incident voltage and the incident current through a circuit, and the principle of the reflected power sampling module 63 is the same. The rf current sampling module 64 detects whether the output current is overloaded by using the rf current signal through the circuit. The incident power, the reflected power and the incident current are signals which directly reflect whether the transmitter works normally or not, the signals are output to the controller and then monitored by the upper computer, and the signals can be wirelessly transmitted to the remote intelligent terminal through the wireless communication module.

Wherein:

1. incident power sampling module

The incident voltage from the output sample is sent to the incident voltage sampling end and sent to the cathode of the detection diode VD6 through the P1 joint 1-2, the incident current is sent to the anode of the detection diode VD6 through the incident current sampling, and as the incident voltage and the incident current are reversely added at two ends of the VD6, the direct current level detected by the VD6 generates power proportional to the direct current level on the R52 through the filtering of the L1 and the C32, namely the square root value of the incident power. The capacitor C33 is an incident power balance adjustment capacitor, and is adjusted to adjust the magnitude of the incident sampling voltage, generally to be consistent with the magnitude of the incident current, so as to be overlapped with the incident sampling current. The detected signal is filtered again by R51, C31 and fed to the input of N3. This signal contains an audio signal and a dc signal reflecting the carrier size, which filters out most of the audio signal due to the large C31 capacity, only very low frequency audio signals and dc levels reflecting the carrier size. N3 and external components form an envelope cancellation circuit, from which it can be seen that the in-phase input end of the operational amplifier is a voltage division signal of a composite signal (direct current+audio), the inverting input end is an audio signal only due to the existence of a blocking capacitor C7, the reactance of C7 and C8 to the audio is far smaller than the resistance value of a corresponding resistor, the reactance value is approximately zero, the reactance is infinite according to short circuit calculation and the reactance is infinite for direct current, the output voltages of the in-phase end and the inverting end when the in-phase end act independently can be obtained respectively according to open circuit calculation, and then the envelope signal component can be cancelled through the addition and subtraction operation of the in-phase end and the inverting end by properly selecting the sizes of the resistors connected with the operational amplifier N3, so that the direct current signal representing the incident power is reflected only.

2. Reflected power sampling module

The reflection power sampling amplification principle and the component function are completely consistent with the incident power sampling amplification instruction. The difference is that the incident current sample added on the positive pole of the reflected power detection diode VD7 is opposite to the sample current added on the incident power, so that the reflected power detection diode VD7 is in phase with the sample voltage added on the negative pole of the opposite phase power detection diode, and when the output tuning is matched, the sample current and the voltage are in phase and consistent in amplitude, so that the VD7 detection output is zero. When standing wave ratio fails, the voltage and the current at two ends of the VD7 are out of phase and have inconsistent amplitude, so that the VD7 generates detection current, voltage drop is generated on R53, the value of the detection current is in direct proportion to the Standing Wave Ratio (SWR), and the value of the detection current is in direct proportion to the square root value of reflected power as the detuning is more or the matching phase difference is larger.

3. Radio frequency current sampling module

The high-frequency sampling signal is sent to VD2 for detection through a resistor R2, C3 is filtered and then is added to load resistors R3 and R4, the level is regulated through the resistor R3 and then is sent to an envelope cancellation circuit based on N1, the principle of the envelope cancellation circuit based on N1 is the same, and N1 is output as a current overload detection signal.

As shown in fig. 4, the operating voltage sampling module 65 is an operational amplifier based window comparison circuit. In the figure, a resistor R66 is connected with sampled voltage, adjustable resistors RP10 and RP11 are used for adjusting comparison voltages of upper and lower detection thresholds, the comparison voltages which are respectively input to an in-phase end and an anti-phase end of an operational amplifier U11B after being adjusted by the adjustable resistors RP10 and RP11 are assumed to be VH and VL, when the voltage VI collected by the R66 meets VL < VI < VH, the operational amplifiers U11B and U11C output high-level signals, and otherwise, when the voltage VI collected by the R66 exceeds the upper and lower thresholds, the voltage VI is output to be low. By this circuit it is possible to reflect whether the mains supply voltage of the transmitter is normal or not, and to output a corresponding signal to the controller 61 when an abnormality is detected.

As shown in fig. 5, the signal source detection module 66 is a balanced-to-unbalanced circuit based on an operational amplifier, and an output end of the operational amplifier is connected to a signal detection end based on an adjustable resistor. In order to reduce inductive noise in signal transmission and signal crosstalk between them, a balanced connection is employed between audio devices. The principle of balanced signal transmission is to divide an audio signal into a positive signal (hot side) and a negative signal (cold side) for transmission, which have the same impedance to ground and opposite polarities. The hot end and the cold end of the balanced signal are in phase with external interference signals in the transmission process, so that external noise or internal noise interference caused by various electromagnetism, power supply and humidity in the transmission process can be restrained and counteracted by utilizing a differential amplifier of an input stage of the audio signal receiving equipment at the terminal of a transmission cable. However, in order to realize the detection of the audio signal, the balanced audio signal needs to be converted into the unbalanced audio signal, and the unbalanced audio signal needs to be realized through a special conversion circuit or equipment, so that the impedance and the level are completely matched, the differential circuit based on the operational amplifier U13 is adopted to output the unbalanced signal, the detection of the audio signal is realized, the adjustment of the amplitude of the detection signal can be realized through the resistor RP1, the detection signal is output to the controller 61, and when the audio signal is lost, the controller 61 can detect the detection signal.

As shown in fig. 6, the fault shutdown detection module 67 is a relay provided with two sets of normally open and normally closed contacts, wherein: one group of normally open contacts are respectively connected with the startup and shutdown detection end and the grounding end, and the other group of normally open contacts are respectively connected with the startup control relay and the power end; one group of normally closed contacts are respectively connected with the suspension end and the grounding end, and the other group of normally closed contacts are respectively connected with the suspension end and the power end. When the transmitter is started, the controller can give a low-level signal to the on-off control end, so that the coil of the relay K1 is electrified, the contacts 4, 8, 13 and 19 which are originally disconnected in the drawing are communicated, a 24V direct current power supply is used for powering on the control relay through the 8 pins after the contacts 4 and 8 are communicated, and the transmitter works after the action of the power-on control relay. Meanwhile, the on-off detection end obtains a low signal through 19 pins, which indicates that the startup is successful. Otherwise, according to the illustrated state, the transmitter is turned off, and the on-off detection end only has a suspension signal. The on/off detection terminal is connected to the controller 61, and the signal of the on/off detection terminal is used to know whether the transmitter is operating or off.

In addition, the electric energy collection terminal 18 is used for collecting the mains voltage, and is not limited in type, for example, a HC-33D6 multi-path combined three-phase electric measurement terminal can be adopted. The three-phase electric parameters including voltage, current, power, electric energy and the like are collected, parameters are provided for external electricity normally or not, and data collected by the electric energy collection terminal 18 are sent to an upper computer and then communicated with the controller 61 through the upper computer.

The working principle of the utility model is as follows:

the working condition of the transmitter is detected by the detection modules of the incident power, the reflected power, the radio frequency overcurrent, the working voltage, the signal source, the fault shutdown and the like in fig. 2, and when any one or more faults occur, the wireless communication module sends a control signal to control the first switching switch action (corresponding to the power distribution fault), the second switching switch action (corresponding to the antenna system fault), the field alarm (corresponding to the station range field prompt) and the remote alarm. For example, when the reflected power is too large (beyond the ordinary power), it indicates that the impedance of the matching network (the impedance matching network consisting of inductance and capacitance) of the antenna is not matched, and the matching network can be switched by controlling the action of the second switch. When the radio frequency current sampling module 64 and the working voltage sampling module 65 detect that the transmitter works abnormally, or the signal source detection module 66 detects that the audio signal is lost, the fault shutdown detection module 67 detects that the fault shutdown, the wireless alarm in each area in the station can be controlled by the wireless communication module to alarm on site, and the alarm signal can be sent to personnel not in the station. When the failure of the commercial power module 2 is detected through the electric energy acquisition terminal 18, the power supply to the transmitter can be realized through the large UPS, then the controller 61 controls the first wireless switch 7 to act through the wireless communication module 9, so that the generator is automatically started, the continuous uninterrupted power supply of the transmitter is realized, and the time delay caused by the manual operation of the generator due to the external electric failure in the prior art is effectively avoided.

In addition, the emergency broadcast signal source can be provided by related departments such as a weather bureau, an emergency management bureau and the like, and is not used at ordinary times. When a social emergency occurs, the signal source is automatically switched to the emergency signal source according to the indication of the corresponding department.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The utility model provides a medium wave transmitter operation monitoring protection system based on wireless communication, its characterized in that includes medium wave transmitter (1) and electric power switch cabinet (4) that is connected with medium wave transmitter (1), large-scale UPS power (5), fault monitoring module (6), second wireless switch (11), signal switch module (13), host computer (17), electric power switch cabinet (4) input is connected commercial power module (2), generator (3), large-scale UPS power (5) is connected to commercial power module (2) output, first wireless switch (7) are connected to generator (3) input, fault monitoring module (6) still with host computer (17), wireless communication module (9) electricity is connected, wireless communication module (9) are connected with first wireless switch (7), wireless alarm (8), remote monitoring terminal (10), second wireless switch (11) wireless communication, second wireless switch (11) are connected with main and standby matching module (12), main and standby matching module (12) are connected with antenna (14) and signal broadcasting source (15) normal signal broadcasting input, the utility power module (2) is also connected with the upper computer (17) through the electric energy acquisition terminal (18).

2. The medium wave transmitter operation monitoring and protecting system based on wireless communication according to claim 1, wherein the fault monitoring module (6) comprises a controller (61) and an incident power sampling module (62), a reflected power sampling module (63), a radio frequency current sampling module (64), an operating voltage sampling module (65), a signal source detecting module (66) and a fault shutdown detecting module (67), which are electrically connected with the controller (61), wherein the controller (61) is connected with the wireless communication module (9) and the upper computer (17) through communication interfaces.

3. The system according to claim 1, wherein the large UPS power source (5) is a UPS power source with a capacity exceeding 20 Kva.

4. The system of claim 2, wherein the operating voltage sampling module (65) is an operational amplifier-based window comparison circuit.

5. The system of claim 2, wherein the signal source detection module (66) is a balanced-to-unbalanced circuit based on an operational amplifier, and an output end of the operational amplifier is connected to a signal detection end based on an adjustable resistor.

6. The system for monitoring and protecting operation of a medium wave transmitter based on wireless communication according to claim 2, wherein the fault shutdown detection module (67) is a relay provided with two groups of normally open and normally closed contacts, and wherein: one group of normally open contacts are respectively connected with the startup and shutdown detection end and the grounding end, and the other group of normally open contacts are respectively connected with the startup control relay and the power end; one group of normally closed contacts are respectively connected with the suspension end and the grounding end, and the other group of normally closed contacts are respectively connected with the suspension end and the power end.

7. The medium wave transmitter operation monitoring and protecting system based on wireless communication according to claim 1, wherein the first wireless switch (7) and the second wireless switch (11) are electronic switches based on 4G/5G, LORA or NB-IOT wireless communication.

8. The medium wave transmitter operation monitoring and protecting system based on wireless communication according to claim 1, wherein the wireless alarm (8) is an alarm based on 4G/5G, LORA or NB-IOT wireless communication, and the remote monitoring terminal (10) is a telemetry and remote control terminal based on 4G/5G, LORA or NB-IOT wireless communication.

9. The system according to claim 1, wherein the signal switching module (13) is an audio matrix switch.

10. The system according to claim 1, wherein the wireless communication module (9) is a 4G/5G communication module, a LORA communication module or an NB-IOT communication module.