CN109274384A - A kind of DMB transmitter automatic protection circuit based on power measurement - Google Patents
A kind of DMB transmitter automatic protection circuit based on power measurement Download PDFInfo
- Publication number
- CN109274384A CN109274384A CN201811374611.7A CN201811374611A CN109274384A CN 109274384 A CN109274384 A CN 109274384A CN 201811374611 A CN201811374611 A CN 201811374611A CN 109274384 A CN109274384 A CN 109274384A
- Authority
- CN
- China
- Prior art keywords
- signal
- interface
- voltage
- dmb
- broadcast transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
Abstract
The present invention relates to a kind of, and the DMB transmitter automatic protection circuit based on power measurement, the first input signal interface and the second input signal interface pass through coupler connection DMB transmitter, reception DMB broadcast transmission signal；First, second filter is connect with the first, second input signal interface, filters out the interference signal in DMB broadcast transmission signal；Multistage logafier is connect with first filter, converts voltage signal by radiofrequency signal for DMB broadcast transmission signal；Programmable attenuator is connect with second filter, adjusts the field strength size of DMB broadcast transmission signal；Microcontroller is connect with amplifier, attenuator, acquires the voltage signal after the conversion of multistage logafier, carries out data processing, the attenuation value of control attenuator adjustment DMB broadcast transmission signal to obtained voltage signal；Output signal interface is for exporting treated DMB broadcast transmission signal.The configuration of the present invention is simple, measures convenient, automatic protection advantage at low cost.
Description
Technical field
The invention belongs to transmitter protection fields, are related to a kind of DMB transmitter automatic protection circuit based on power measurement.
Background technique
The size of power is the important indicator of reflected radio transmitting signal(l)ing condition.With the development of technology, the measurement of power
Automation is done step-by-step with adjustment, shortens measurement and adjustment time, realizes the automatic protection of transmitter.Existing measurement is wide
The method for penetrating signal strength is broadcast, is tested using frequency spectrograph.Frequency spectrograph test result is accurate, and versatility is good, but
Volume is big, expensive, be unable to do without manual operation.
Existing transmitter automatic protection module is largely for Designing power amplifier, and structure is complicated, function list
One.When output power of transmitter exception, output power is returned 0 by protection circuit, alarm lamp flashing, then by staff into
Row resets or checks failure by equipment such as oscillograph, frequency spectrographs.
Existing transmitter protection circuit, when output power exception, transmitter stops working, and waits at staff
Reason.Staff judges failure by the intensity of the device measurings broadcast singal such as frequency spectrograph.Existing frequency spectrograph measures essence
It spends very high (can largely arrive 0.1dBm or higher), tests broader bandwidth (generally in 100MHz or more).For reach precision and
The requirement of bandwidth, field strength measurement system need to carry out complicated signal processing, lead to that some structure is complicated, price is high, Er Qiechong
Measure larger, the biggish characteristic of volume.In fact, to most of digital multimedia broadcasting (Digital Multimedia
Broadcasting, DMB) broadcasting engineering, especially towards cell application DMB broadcasting engineering for, from the angle of daily maintenance
Degree, field strength measurement and adjustment do not need so high precision and bandwidth, and with greater need for it is a kind of it is simple, can probably measure letter
Number intensity, according to measured value, adjust automatically DMB emits the circuit of signal strength in the appropriate range.Obviously, traditional protection electricity
Road is unable to satisfy requirement.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of DMB transmitter automatic protection circuit based on power measurement,
The defect that the present invention is cumbersome, at high cost for the existing field strength regulating step for emitting signal, cannot automate, is based on small-sized DMB
The characteristic of transmitter realizes the automatic adjustment to DMB broadcast transmission signal field strength.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of DMB transmitter automatic protection circuit based on power measurement, including the first input signal interface, the second input
Signaling interface, and the first filter being connect respectively with the first input signal interface and the second input signal interface and the second filter
Wave device, the first filter are connected with multistage logafier, and the second filter is connected with programmable attenuator, the journey
Control attenuator is also connected with output signal interface；It further include microcontroller, it is the microcontroller and multistage logafier, program-controlled
Attenuator connection, further includes power supply interface and voltage-stablizer connected to it, and the voltage-stablizer connection microcontroller, multistage logarithm are put
Big device and programmable attenuator；
The first input signal interface and the second input signal interface receive DMB by coupler connection DMB transmitter
Broadcast transmission signal；
The first filter and second filter are used to filter out the interference signal in DMB broadcast transmission signal；
The multistage logafier is used to convert voltage signal for the processing of DMB broadcast transmission signal；
The programmable attenuator is used to adjust the field strength size of DMB broadcast transmission signal；
The coupler is divided into two signal is emitted, and the field strength of two paths of signals is equal, is connect respectively by the first input signal
Mouth and the second input signal interface enter circuit, and first via radiofrequency signal, which enters in multistage logafier, is converted to voltage letter
Number, (transmitting signal itself belongs to radiofrequency signal, radio frequency to the voltage signal size converted by microcontroller measurement by radiofrequency signal
Signal can not directly be measured by microcontroller, so to be first converted into voltage signal, could be passed to microcontroller and be surveyed
Amount), the second tunnel radiofrequency signal enters in programmable attenuator, the voltage signal measured by microcontroller according to first via signal
Size to adjust the size of the second tunnel radiofrequency signal, and is gone out via output signal interface Transmission；
The microcontroller is used to acquire the voltage signal after the conversion of multistage logafier, then believes obtained voltage
Number carry out data processing, obtain the numerical value of voltage signal, in the microcontroller set voltage signal numeric threshold, work as voltage signal
When numerical value is more than the numeric threshold, microcontroller control programmable attenuator accordingly adjusts the second road DMB broadcast transmission signal
Attenuation value makes the field strength of the second road DMB broadcast transmission signal in the normal range；
The power supply interface is used to need the module powered to be powered to each, is carried out by voltage-stablizer to output voltage
Stablize；
The output signal interface is for exporting treated DMB broadcast transmission signal.
Further, the ÷ of numerical value vol=Adc × 3.3 4096 of the voltage signal, wherein vol indicates that voltage value is (single
Position: V), Adc indicates the voltage signal data amount being converted to via multistage logafier.
Further, the power supply interface is USB interface, connects computer by USB connecting line and is powered.
Further, the first input signal interface, the second input signal interface and output signal interface are SMA radio frequency company
Connect device.
Further, the first input signal interface, the second input signal interface and output signal interface are BNC connector.
The beneficial effects of the present invention are: the present invention effectively improve existing signal strength regulating step it is cumbersome, at
This height, the defect that cannot be automated realize the DMB broadcast transmission letter within the scope of accurate measurement and automatic adjustment -65dBm to 5dBm
Number field strength, error is less than or equal to 2dBm, has structure simple, low cost, measures convenient, automatic protection advantage.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is the structural schematic diagram of the DMB transmitter automatic protection circuit of the present invention based on power measurement；
Fig. 2 is the PCB schematic diagram of the DMB transmitter automatic protection circuit of the present invention based on power measurement.
Appended drawing reference: the first input signal interface 1, the second input signal interface 2, first filter 3, second filter 4,
Programmable attenuator 5, multistage logafier 6, microcontroller 7, power supply interface 8, voltage-stablizer 9, output signal interface 10.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As shown in Figure 1 and Figure 2, a kind of DMB transmitter automatic protection circuit based on power measurement, including the first input letter
Number interface 1, the second input signal interface 2, and connect respectively with the first input signal interface 1 and the second input signal interface 2
First filter 3 and second filter 4, the first filter 3 is connected with multistage logafier 6, second filtering
Device 4 is connected with programmable attenuator 5, and the programmable attenuator 5 is also connected with output signal interface 10；It further include microcontroller 7, institute
State microcontroller 7 with multistage logafier 6, programmable attenuator 5 is connect, further include power supply interface 8 and pressure stabilizing connected to it
Device 9, the voltage-stablizer 9 connect microcontroller 7, multistage logafier 6 and programmable attenuator 5；
First input signal interface 1 connects DMB transmitter by coupler with the second input signal interface 2, and it is wide to receive DMB
It broadcasts and penetrates signal, the coupler is divided into two signal is emitted, and the field strength of two paths of signals is equal, respectively by the first input signal
Interface 1 and the second input signal interface 3 enter circuit, and first via radiofrequency signal, which enters in multistage logafier 6, is converted to electricity
Pressure signal, the voltage signal size converted by microcontroller measurement by radiofrequency signal (transmitting signal itself belongs to radiofrequency signal,
Radiofrequency signal can not directly be measured by microcontroller, so to be first converted into voltage signal, could be passed to microcontroller progress
Measurement), the second tunnel radiofrequency signal enters in programmable attenuator 5, the voltage measured by microcontroller according to first via signal
Signal magnitude to adjust the size of the second tunnel radiofrequency signal, and is launched via output signal interface 10；
First filter 3 and second filter 4 are used to filter out the interference signal in DMB broadcast transmission signal；
Multistage logafier 6 is used to convert voltage signal for the processing of DMB broadcast transmission signal, in the present embodiment may be used
Using the multistage logafier 6 of max2014 model；
Programmable attenuator 5 is used to adjust the field strength size of DMB broadcast transmission signal, can use in the present embodiment
The programmable attenuator 5 of PE4302 model；
Microcontroller 7 is used to acquire the voltage signal after the conversion of multistage logafier 6, then to obtained voltage signal
Data processing is carried out, the numerical value of voltage signal is obtained, voltage signal numeric threshold is set in the microcontroller, when voltage signal number
When value is more than the numeric threshold, microcontroller control programmable attenuator 5 accordingly adjusts declining for the second road DMB broadcast transmission signal
Subtrahend value, the field strength for making the second road DMB broadcast transmission signal in the normal range, can use in the present embodiment
The microcontroller 7 of STM32F103VE model；
The ÷ of numerical value vol=Adc × 3.3 4096 of the voltage signal
Wherein vol indicates voltage value (unit: V), and Adc indicates that the voltage being converted to via multistage logafier 6 is believed
Number amount；
Power supply interface 8 is used to need the module powered to be powered to each, is carried out by voltage-stablizer 9 to output voltage steady
Fixed, power supply interface 8 can be USB interface, connects computer by USB connecting line and is powered, USB interface can be Micro
USB interface is also possible to Type-C USB interface, selects USB A type public affairs mouth to be powered in the present embodiment, voltage-stablizer 9 can
To select AMS1117；
Output signal interface 10 is for exporting treated DMB broadcast transmission signal.
Input signal interface and output signal interface 10 can select SMA radio frequency interface, can also select BNC connector, N-type
Connector etc. uses standard type SMA interface in the present embodiment.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (5)
1. a kind of DMB transmitter automatic protection circuit based on power measurement, it is characterised in that: connect including the first input signal
Mouth, the second input signal interface, and the first filter being connect respectively with the first input signal interface and the second input signal interface
Wave device and second filter, the first filter are connected with multistage logafier, and the second filter is connected with program-controlled
Attenuator, the programmable attenuator are also connected with output signal interface；It further include microcontroller, the microcontroller and multistage are right
Number amplifier, programmable attenuator connection, further include power supply interface and voltage-stablizer connected to it, and the voltage-stablizer connects microcontroller
Device, multistage logafier and programmable attenuator；
The first input signal interface and the second input signal interface receive DMB broadcast by coupler connection DMB transmitter
Emit signal；
The first filter and second filter are used to filter out the interference signal in DMB broadcast transmission signal；
The multistage logafier is used to convert voltage signal for the processing of DMB broadcast transmission signal；
The programmable attenuator is used to adjust the field strength size of DMB broadcast transmission signal；
The coupler is divided into two signal is emitted, and the field strength of two paths of signals is equal, respectively by the first input signal interface and
Second input signal interface enters circuit, and first via radiofrequency signal, which enters in multistage logafier, is converted to voltage signal, leads to
It crosses microcontroller and calculates the voltage signal size converted by radiofrequency signal, second road signal enters in programmable attenuator, by micro-
The voltage signal size that controller is measured according to first via signal, to adjust the size of the second road signal, and via output
Signaling interface is launched；
The microcontroller be used for acquire through multistage logafier convert after voltage signal, then to obtained voltage signal into
Row data processing obtains the numerical value of voltage signal, voltage signal numeric threshold is set in the microcontroller, when voltage signal numerical value
When more than the numeric threshold, microcontroller control programmable attenuator accordingly adjusts the decaying of the second road DMB broadcast transmission signal
Numerical value makes the field strength of the second road DMB broadcast transmission signal in the normal range；
The power supply interface is used to need the module powered to be powered to each, is carried out by voltage-stablizer to output voltage steady
It is fixed；
The output signal interface is for exporting treated DMB broadcast transmission signal.
2. the DMB transmitter automatic protection circuit according to claim 1 based on power measurement, it is characterised in that: described
The ÷ of numerical value vol=Adc × 3.3 4096 of voltage signal, wherein vol indicates voltage value, unit: V, Adc are indicated via multistage
The voltage signal data amount that logafier is converted to.
3. the DMB transmitter automatic protection circuit according to claim 1 based on power measurement, it is characterised in that: described
Power supply interface is USB interface, connects computer by USB connecting line and is powered.
4. the DMB transmitter automatic protection circuit according to claim 1 based on power measurement, it is characterised in that: described
First input signal interface, the second input signal interface and output signal interface are SMA radio frequency connector.
5. the DMB transmitter automatic protection circuit according to claim 1 based on power measurement, it is characterised in that: described
First input signal interface, the second input signal interface and output signal interface are BNC connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374611.7A CN109274384A (en) | 2018-11-19 | 2018-11-19 | A kind of DMB transmitter automatic protection circuit based on power measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374611.7A CN109274384A (en) | 2018-11-19 | 2018-11-19 | A kind of DMB transmitter automatic protection circuit based on power measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109274384A true CN109274384A (en) | 2019-01-25 |
Family
ID=65190544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811374611.7A Pending CN109274384A (en) | 2018-11-19 | 2018-11-19 | A kind of DMB transmitter automatic protection circuit based on power measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109274384A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653479A (en) * | 2020-12-16 | 2021-04-13 | 重庆邮电大学 | DMB baseband SoC supporting single frequency network function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070079354A1 (en) * | 2005-10-05 | 2007-04-05 | Lee Jong-Bae | Tuner having attenuation function and control method for the same |
| CN101060347A (en) * | 2006-04-17 | 2007-10-24 | 阿尔卑斯电气株式会社 | AM and FM broadcast receiving circuit |
| CN201303322Y (en) * | 2008-09-17 | 2009-09-02 | 三维通信股份有限公司 | Power amplifier protective device for ultra high frequency (UHF) transmitter |
| CN108375699A (en) * | 2018-02-07 | 2018-08-07 | 重庆邮电大学 | DMB field portable intensity measurers |
-
2018
- 2018-11-19 CN CN201811374611.7A patent/CN109274384A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070079354A1 (en) * | 2005-10-05 | 2007-04-05 | Lee Jong-Bae | Tuner having attenuation function and control method for the same |
| CN101060347A (en) * | 2006-04-17 | 2007-10-24 | 阿尔卑斯电气株式会社 | AM and FM broadcast receiving circuit |
| CN201303322Y (en) * | 2008-09-17 | 2009-09-02 | 三维通信股份有限公司 | Power amplifier protective device for ultra high frequency (UHF) transmitter |
| CN108375699A (en) * | 2018-02-07 | 2018-08-07 | 重庆邮电大学 | DMB field portable intensity measurers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653479A (en) * | 2020-12-16 | 2021-04-13 | 重庆邮电大学 | DMB baseband SoC supporting single frequency network function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106405473B (en) | Radiation immunity electromagnetic compatibility testing system and method suitable for high-voltage metering equipment | |
| CN204481817U (en) | Optical module parameter testing equipment | |
| CN204536493U (en) | Intelligent gas meter veneer automatically testing platform | |
| CN109991480B (en) | Detection device and method of M-Bus signal instrument under intentional radiation interference | |
| CN106027170A (en) | Digital miniature channel equipment automatic test device and system | |
| CN103336250A (en) | DC/DC power supply converter single event effect detection system based on voltage adaptive technology | |
| CN103840899A (en) | Automatic test device of transceiving assembly | |
| CN206848464U (en) | Portable navigation management secondary radar signal near-field/far-field detector | |
| CN203658527U (en) | An ultrasonic partial discharge detection device for high-voltage electrical equipment | |
| CN109274384A (en) | A kind of DMB transmitter automatic protection circuit based on power measurement | |
| CN104991211B (en) | A kind of light-operated converter valve TVM plate ATEs of D.C. high voltage transmission | |
| CN204389583U (en) | A kind of grounding net of transformer substation three-dimensional digital monitoring data collector | |
| CN205179373U (en) | A intermodulation test system that is used for POI's multifrequency section to stride standard | |
| CN108390733A (en) | A kind of multi-channel radio frequency power amplifier test system and method | |
| CN204886982U (en) | Ultrashort wave radio station terminal test appearance | |
| WO2019033642A1 (en) | Test instrument, antenna measurement system and test method | |
| CN116908822A (en) | Test signal acquisition device and circuit test and real-time analysis system of multichannel sonar transmitter | |
| CN207908626U (en) | A kind of simulation high frequency Partial discharge signal generating means | |
| CN207010996U (en) | Tester, antenna measurement system | |
| CN214201637U (en) | Automatic test system of broadband signal acquisition playback system | |
| CN108375699A (en) | DMB field portable intensity measurers | |
| CN108923872A (en) | A kind of repeater passband fluctuation calibration method and system | |
| CN108241089A (en) | Detection device | |
| CN114448532A (en) | Detection debugging system and method for wireless data communication terminal | |
| CN209927938U (en) | Detection device of M-Bus signal instrument under intentional radiation interference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190125 |
|
| RJ01 | Rejection of invention patent application after publication |