CN204536419U - The digital reflective power table of PSM broadcast transmitter - Google Patents
The digital reflective power table of PSM broadcast transmitter Download PDFInfo
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- CN204536419U CN204536419U CN201520150633.0U CN201520150633U CN204536419U CN 204536419 U CN204536419 U CN 204536419U CN 201520150633 U CN201520150633 U CN 201520150633U CN 204536419 U CN204536419 U CN 204536419U
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Abstract
The utility model relates to the digital reflective power table of a kind of PSM broadcast transmitter, comprises sampled signal treatment circuit, A/D translation circuit, data processing circuit, liquid crystal display, g-load control circuit and power circuit; The input end of sampled signal treatment circuit connects reflective power sampling probe, and lotus control circuit is taken on its output terminal one road, and another road connects A/D translation circuit through double throw switch S1; The input end of g-load control circuit connects with sampled signal treatment circuit, and its output terminal is for connecting the control circuit of PSM broadcast transmitter, and its adjustment output terminal connects A/D translation circuit through double throw switch S1; When adjusting output terminal and connecting with A/D translation circuit, carry out the adjustment of reflective power table; After adjustment output terminal disconnects, judge whether the sampled signal inputted transfinites, and send overload protection signal when transfiniting.The utility model solves existing reflective power table adjustment inconvenience and causes the problem of the automatic downrating of transmitter because of misoperation.
Description
Technical field
The utility model relates to a kind of power-measuring device of broadcast transmitter, specifically the digital reflective power table of a kind of PSM broadcast transmitter.
Background technology
DF100A type PSM broadcast transmitter is the high-power transmitter produced by former Ministry of Radio, Film and Television equipment manufacturing, and this broadcast transmitter frequency of operation is at short-wave band, and it is 100KW that carrier wave exports rated power.The standing-wave ratio (SWR) of PSM broadcast transmitter and antenna-feedback system requires within 2, is scaled reflective power, requires that reflective power is less than 11KW.PSM broadcast transmitter is when normally working, and General Requirements reflective power is less than 4KW.
The standing-wave ratio (SWR) (reflective power) of PSM broadcast transmitter antenna-feedback system not only affects the efficiency of transmitter, the more important thing is, has great impact to the safe and stable operation of transmitter.The standing-wave ratio (SWR) of antenna-feedback system is excessive, can produce high voltage, time serious, also can cause the damage of the valuable devices such as vacuum capacitance on the harmonic filter of transmitter, balun and high last circuit.
DF100A type PSM broadcast transmitter uses reflective power table to monitor the reflective power of antenna-feedback system, to reflect the size of the standing-wave ratio (SWR) of antenna-feedback system.When reflective power excessive and exceed setting threshold value time, cut off the high end of transmitter and high pressure, transmitter protected.
On DF100A type PSM broadcast transmitter, original reflective power table is that Simpson company produces, and is import instrument.Instruction range is 0-50KW.From the signal that the sampling of reflective power sampling probe is returned, deliver to reflective power table by radio-frequency cable and current-limiting resistance.After reflective power table amplifies sampled signal, table-drive interior loop is rotated, and drives black needle deflection, instruction reflective power.
Existing reflective power table in use Problems existing has following several respects:
1, because the output signal of power sampling probe is nonlinear, so the dial scale of emissive power table instrument is heterogeneous, like this, for reading, not easily reading.
2, this reflective power table, be import instrument, commercially purchase inconvenience, channel is little.The most important thing is expensive.
3, due to the various factors of transmitter system, need to calibrate reflective power table every certain hour.Present calibrating mode calibrates reflective power table by adjusting the current-limiting resistance connected with reflective power table.Because current-limiting resistance is mounted in the inside of transmitter, adjust at every turn, all will close transmitter, enter into transmitter inside and adjust, after adjustment, then add high pressure to transmitter, and then observe the result of adjustment.So repeatedly carry out adjustment, until reach requirement.And in the operation element of reality, this adjustment mode is very inconvenient.
4, original reflective power table produces misoperation sometimes after g-load.Because the black pointer in reflective power table (this pointer instruction current reflective performance number) often deflection arrive red pointer or when streaking red pointer; capital makes optocoupler action once; reflective power table is made to send the excessive signal of reflective power to transmitter; transmitter will cut out high last high pressure; protect, and record reflective power g-load once.When the high last high pressure of Transmitter Turn-Off, when reflective power reduces to zero, the black pointer backswing of reflective power table, can, again through optocoupler, cause reflective power table can send again the excessive signal of reflective power.And now, reflective power is zero, be the signal that have sent mistake so actual.But transmitter is recorded as reflective power g-load once equally.Transmitter, will downrating after record reflective power g-load three times, if after lotus several times, automatically will close transmitter.So, as long as existing reflective power table exists transmitter twice reflective power g-load, transmitter will be caused to be recorded as g-load more than three times, thus to cause the situation of automatic downrating to occur.
Utility model content
The purpose of this utility model is just to provide the digital reflective power table of a kind of PSM broadcast transmitter, to solve the problem that existing reflective power table adjusts inconvenience and causes the automatic downrating of transmitter because of misoperation.
The utility model is achieved in that the digital reflective power table of a kind of PSM broadcast transmitter, includes:
Sampled signal treatment circuit, its input end connects reflective power sampling probe, lotus control circuit is taken on its output terminal one road, another road connects A/D translation circuit through double throw switch S1, the sampled signal of reflective power is being carried out to filtering and is outputting to A/D translation circuit and g-load control circuit respectively after amplifying;
A/D translation circuit, its input end connects sampled signal treatment circuit and g-load control circuit respectively through double throw switch S1, and it exports termination data processing circuit, exports after carrying out digital-to-analog conversion to the sampled signal of input to data processing circuit;
Data processing circuit, its input termination A/D translation circuit, it exports termination display, exports to display for the sampled signal after digital to analog conversion being converted to the reflective power value that will show;
Display, connects with described data processing circuit, for carrying out numerical monitor to the outputting data signals of data processing circuit;
G-load control circuit, its input end connects with sampled signal treatment circuit, and its output terminal is for connecting the control circuit of PSM broadcast transmitter, and its adjustment output terminal connects A/D translation circuit through double throw switch S1; When adjusting output terminal and connecting with A/D translation circuit, for carrying out the adjustment of reflective power table; After adjustment output terminal and A/D translation circuit disconnect, namely for judging whether the sampled signal of the reflective power inputted transfinites, and send overload protection signal when transfiniting to PSM broadcast transmitter; And
Power circuit, connects with each part mentioned above respectively, for each part mentioned above provides required operating voltage.
The circuit structure of described sampled signal treatment circuit is: connection terminal Sin+ connects the positive terminal of power sampling probe output signal, and after the first filtering circuit connected to form via resistance R11 and electric capacity C18, C19, C20, be connected to the 2 pin input ends of integrated chip U9 (AD524AD); Connection terminal Sin-connects the negative pole end of power sampling probe output signal, after connecting to form the second filtering circuit, is connected to the 1 pin input end of integrated chip U9 via resistance R12 and electric capacity C22, C23, C24; One end of adjustable potentiometer R10 is connected to 3 pin of integrated chip U9, connects 11 pin of integrated chip U9 after the other end of adjustable potentiometer R10 is in parallel with sliding end, by adjustment potentiometer R10, can adjust the enlargement factor of integrated chip U9; 9 pin of integrated chip U9 and 10 pin also connect the rear output terminal as integrated chip U9, and this output terminal one road is connected to the 1st end of double throw switch S1, and another road is connected to described g-load control circuit.
The circuit structure of described g-load control circuit is :+5V voltage is through resistance R7 and potentiometer R6 ground connection, and sliding end one tunnel of potentiometer R6 connects the 3 pin positive inputs of voltage comparator U8A through resistance R8, another road connects the 3rd end of double throw switch S1; The output terminal of the integrated chip U9 in sampled signal treatment circuit connects the 2 pin reverse input ends of voltage comparator U8A through resistance R9; Coil 7 pin of the 1 pin output terminal contact relay K1 of voltage comparator U8A, the coil 8 pin ground connection of relay K 1,6 pin of relay K 1 are normal opened contact, connect+24V voltage; 4 pin output terminals of relay K 1 connect the control circuit of transmitter, and 2 pin of relay K 1 are normally closed contact, connect 115V alternating voltage.
The beneficial effects of the utility model are embodied in following several respects:
1, adopt liquid crystal display numerical monitor, clear reading is clear and definite.
The needle deflection of the curve of output determination display circuit of the power sampling probe 2, gone out according to site-test analysis, is obviously better than the reflective power table of original modulating output to the accuracy of power instruction.
3, complete designed, designed and the localization of DF100A type PSM broadcast transmitter reflective power table, produce and acquisition cost low, and buying facilitate.
4, calibration is simple, operates easy.The calibration potentiometer design of reflective power table is on the main panel of dial plate.When transmitter carries out the calibration of power, open transmitter, transmitter power is adjusted to certain power (being demarcated by fictitious load), then by the calibration potentiometer in adjustment form, make indicator indicated value be real power, this completes the calibration of power.
5, adopt electronic type triggering mode to carry out g-load control, stopped original reflective power table completely and adopted mechanical type to trigger and the misoperation of generation.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of sampled signal treatment circuit.
Fig. 3 is the circuit theory diagrams of g-load control circuit.
Fig. 4 is AD value and reflective power homologous thread figure.
Embodiment
As shown in Figure 1, the utility model comprises sampled signal treatment circuit 1, A/D translation circuit 2, data processing circuit 3, display 4, g-load control circuit 5 and power circuit 6; Wherein, sampled signal treatment circuit 1 is for core with high-precision meter operational amplifier A D524AD, its input end connects reflective power sampling probe, lotus control circuit 5 is taken on its output terminal one road, another road connects A/D translation circuit 2 through double throw switch S1, the sampled signal of reflective power is being carried out to filtering and is outputting to A/D translation circuit 2 and g-load control circuit 5 respectively after amplifying; A/D translation circuit 2 is with A/D conversion chip ADC0804 for core, and it exports termination data processing circuit 3, exports after carrying out digital-to-analog conversion to the sampled signal of input to data processing circuit 3; Data processing circuit 3 take single-chip microcomputer as core, its input termination A/D translation circuit 2, and it exports termination display 4, exports to display 4 for the sampled signal after digital to analog conversion being converted to the reflective power value that will show; Display 4 is with LCDs 12864 for core, connects with data processing circuit 3, for carrying out numerical monitor to the outputting data signals of data processing circuit 3; G-load control circuit 5 is that its input end connects with sampled signal treatment circuit 1 with voltage comparator and relay for core, and its output terminal is for connecting the control circuit of PSM broadcast transmitter, and its adjustment output terminal connects A/D translation circuit 2 through double throw switch S1; When adjusting output terminal and connecting with A/D translation circuit 2, carry out the adjustment of reflective power table; After adjustment output terminal and A/D translation circuit 2 disconnect, namely for judging whether the sampled signal of the reflective power inputted transfinites, and send overload protection signal when transfiniting to PSM broadcast transmitter; Power circuit 6 connects with each part mentioned above respectively, for each part mentioned above provides required operating voltage.
The basic process of the display of reflective power is: reflective power sampled signal, after process is amplified, through the 1st end and the 2nd tip node of double throw switch S1, is input to A/D change-over circuit 2 and carries out A/D conversion.After A/D conversion, single-chip microcomputer digital signal given in data processing circuit 3 carries out calculation process, and then the reflective power value calculated is shown by the LCDs of display 4 by single-chip microcomputer.
In the design, the design range of digital reflective power table is 0-50KW, adopts 3 displays, to be shown to after radix point 1, as 11.2KW.According to design, select 8 approach type A/D converter ADC0804 successively, numerical value change scope 0-255.The input range of analog voltage is 0-5V.Error is 1|LSB|, namely 1/256.Select STC89C52 single-chip microcomputer as data processing chip, display screen selects 12864 liquid crystal display displays.
Reflective power sampled signal is after amplification and A/D conversion, and A/D conversion value is sent to single-chip microcomputer process and is finally presented on 12864 liquid crystal displays.How correct display reflective power value is an emphasis.According to the curve of power probe, through conversion, we can calculate the homologous thread in Fig. 4.Like this, the mapping relations between A/D value and reflective power value P are just obtained.According to these mapping relations, by the data processing of single-chip microcomputer, just can the magnitude numerical value of real-time reflective power be presented on liquid crystal display, achieve the instruction of reflective power.
As shown in Figure 2, the circuit structure of described sampled signal treatment circuit is: connection terminal Sin+ connects the positive terminal of power sampling probe output signal, and after the first filtering circuit connected to form via resistance R11 and electric capacity C18, C19, C20, be connected to the 2 pin input ends of integrated chip U9 (AD524AD); Connection terminal Sin-connects the negative pole end of power sampling probe output signal, after connecting to form the second filtering circuit, is connected to the 1 pin input end of integrated chip U9 via resistance R12 and electric capacity C22, C23, C24; One end of adjustable potentiometer R10 is connected to 3 pin of integrated chip U9, connects 11 pin of integrated chip U9 after the other end of adjustable potentiometer R10 is in parallel with sliding end, by adjustment potentiometer R10, can adjust the enlargement factor of integrated chip U9; 9 pin of integrated chip U9 and 10 pin also connect the rear output terminal as integrated chip U9, and this output terminal one road is connected to the 1st end of double throw switch S1, and another road is connected to described g-load control circuit.C17 is filter capacitor, and+15V and+15V is bias supply.
Output signal due to reflective power sampling probe is feeble signal, in order to realize the digitized processing after A/D conversion and A/D conversion, needs after the amplification of faint sampled signal, then carries out A/D conversion.Therefore, the precision of small signal amplifier, the height of degree of stability are directly connected to the accuracy of instrument.The utility model have employed high-precision meter amplifier AD524AD, and it is high that AD524AD has common-mode rejection ratio, and nonlinearity erron is little, and input impedance is high, and low noise, low maladjustment voltage and low maladjustment voltage drift about, and are with differential input, and variable gain exports.AD524AD can change peripheral wiring to change gain, and gain factor is 1,10,100,1000, when needing other gains between 1-1000, arranges required gain by outer meeting resistance.In fig. 2, reflective power sampled signal after filtering after, be input to the differential input terminal of AD524AD, through amplification after, from AD524AD-9 end export.R10 is amplifier gain adjustment potentiometer, and adjustment potentiometer R10, can make the output area of amplifier between 0-5V, to meet design requirement.Also the calibration of power can be carried out by potentiometer R10.
As shown in Figure 3, the circuit structure of described g-load control circuit is :+5V voltage is through resistance R7 and potentiometer R6 ground connection, and sliding end one tunnel of potentiometer R6 connects the 3 pin positive inputs of voltage comparator U8A through resistance R8, another road connects the 3rd end of double throw switch S1; The output terminal of the integrated chip U9 in sampled signal treatment circuit connects the 2 pin reverse input ends of voltage comparator U8A through resistance R9; Coil 7 pin of the 1 pin output terminal contact relay K1 of voltage comparator U8A, the coil 8 pin ground connection of relay K 1,6 pin of relay K 1 are normal opened contact, connect+24V voltage; 4 pin output terminals of relay K 1 connect the control circuit of transmitter, and 2 pin of relay K 1 are normally closed contact, connect 115V alternating voltage.
G-load controls to comprise the protection that reflective power crosses the setting of charge values and display, reflective power g-load.
When carrying out reflective power and crossing the setting of charge values, double throw switch S1 pulls the 3rd tip node, and the 3rd end of double throw switch S1 is communicated with the 2nd tip node.The potentiometer R6 of g-load control circuit obtains branch pressure voltage, as the setting value of reflective power g-load.This voltage is divided into two-way, leads up to the 3rd end of double throw switch S1 and the 2nd tip node, through the process of A/D change-over circuit 2 and data processing circuit 3, shows as reflective power g-load setting value.Adjustment potentiometer R6, just can set the reflective power g-load threshold value of needs; 3 pin of voltage comparator U8A are delivered on another road, as reference voltage.The reflective power probe sampled signal amplified through AD524AD delivers to 2 pin of voltage comparator U8A.When reflective power is normally namely lower than g-load setting value, 1 pin of voltage comparator U8A exports high level, and the coil of relay K 1 obtains electric, and 6 pin and 4 pin of relay K 1 close, and 2 pin and 1 pin of K1 disconnect.When reflective power becomes large, during 3 pin voltage higher than voltage comparator U8A of the 2 pin voltages of voltage comparator U8A, the 1 pin output low level of voltage comparator U8A, the coil losing electricity of relay K 1.Like this, the overload protection function of reflective power is just achieved.
Claims (3)
1. the digital reflective power table of PSM broadcast transmitter, is characterized in that, include:
Sampled signal treatment circuit, its input end connects reflective power sampling probe, lotus control circuit is taken on its output terminal one road, another road connects A/D translation circuit through double throw switch S1, the sampled signal of reflective power is being carried out to filtering and is outputting to A/D translation circuit and g-load control circuit respectively after amplifying;
A/D translation circuit, its input end connects sampled signal treatment circuit and g-load control circuit respectively through double throw switch S1, and it exports termination data processing circuit, exports after carrying out digital-to-analog conversion to the sampled signal of input to data processing circuit;
Data processing circuit, its input termination A/D translation circuit, it exports termination display, exports to display for the sampled signal after digital to analog conversion being converted to the reflective power value that will show;
Display, connects with described data processing circuit, for carrying out numerical monitor to the outputting data signals of data processing circuit;
G-load control circuit, its input end connects with sampled signal treatment circuit, and its output terminal is for connecting the control circuit of PSM broadcast transmitter, and its adjustment output terminal connects A/D translation circuit through double throw switch S1; When adjusting output terminal and connecting with A/D translation circuit, for carrying out the adjustment of reflective power table; After adjustment output terminal and A/D translation circuit disconnect, namely for judging whether the sampled signal of the reflective power inputted transfinites, and send overload protection signal when transfiniting to PSM broadcast transmitter; And
Power circuit, connects with each part mentioned above respectively, for each part mentioned above provides required operating voltage.
2. the digital reflective power table of PSM broadcast transmitter according to claim 1, it is characterized in that, the circuit structure of described sampled signal treatment circuit is: connection terminal Sin+ connects the positive terminal of power sampling probe output signal, and after the first filtering circuit connected to form via resistance R11 and electric capacity C18, C19, C20, be connected to the 2 pin input ends of integrated chip U9; Connection terminal Sin-connects the negative pole end of power sampling probe output signal, after connecting to form the second filtering circuit, is connected to the 1 pin input end of integrated chip U9 via resistance R12 and electric capacity C22, C23, C24; One end of adjustable potentiometer R10 is connected to 3 pin of integrated chip U9, connects 11 pin of integrated chip U9 after the other end of adjustable potentiometer R10 is in parallel with sliding end, by adjustment potentiometer R10, can adjust the enlargement factor of integrated chip U9; 9 pin of integrated chip U9 and 10 pin also connect the rear output terminal as integrated chip U9, and this output terminal one road is connected to the 1st end of double throw switch S1, and another road is connected to described g-load control circuit.
3. the digital reflective power table of PSM broadcast transmitter according to claim 2, it is characterized in that, the circuit structure of described g-load control circuit is :+5V voltage is through resistance R7 and potentiometer R6 ground connection, sliding end one tunnel of potentiometer R6 connects the 3 pin positive inputs of voltage comparator U8A through resistance R8, another road connects the 3rd end of double throw switch S1; The output terminal of the integrated chip U9 in sampled signal treatment circuit connects the 2 pin reverse input ends of voltage comparator U8A through resistance R9; Coil 7 pin of the 1 pin output terminal contact relay K1 of voltage comparator U8A, the coil 8 pin ground connection of relay K 1,6 pin of relay K 1 connect+24V voltage; 4 pin output terminals of relay K 1 connect the control circuit of transmitter, and 2 pin of relay K 1 connect 115V alternating voltage.
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| CN201520150633.0U CN204536419U (en) | 2015-03-17 | 2015-03-17 | The digital reflective power table of PSM broadcast transmitter |
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| CN201520150633.0U CN204536419U (en) | 2015-03-17 | 2015-03-17 | The digital reflective power table of PSM broadcast transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338699A (en) * | 2016-10-18 | 2017-01-18 | 成都前锋电子仪器有限责任公司 | Dummy load circuit |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338699A (en) * | 2016-10-18 | 2017-01-18 | 成都前锋电子仪器有限责任公司 | Dummy load circuit |
| CN106338699B (en) * | 2016-10-18 | 2023-04-18 | 成都前锋电子仪器有限责任公司 | Dummy load circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20160317 |