CN101119119B - Method and apparatus for detecting open circuit fault of transmitter - Google Patents
Method and apparatus for detecting open circuit fault of transmitter Download PDFInfo
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- CN101119119B CN101119119B CN2007100766379A CN200710076637A CN101119119B CN 101119119 B CN101119119 B CN 101119119B CN 2007100766379 A CN2007100766379 A CN 2007100766379A CN 200710076637 A CN200710076637 A CN 200710076637A CN 101119119 B CN101119119 B CN 101119119B
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Abstract
The present invention discloses a method for detecting fault in open circuit of transmitter and a device and a transmitter which has the open fault measuring function. The transmitter open fault measuring method comprises the follow steps: the ground electric parameter of the output end of the transmitter internal power amplifier is measured; and the transmitter has open fault if the measured ground electric parameter is higher than the default threshold value. The transmitter open fault measuring device comprises an open fault measuring module and a ground electric parameter which is used for measuring the output end of the transmitter internal power amplifier and outputting the open fault alarming signal or corresponding control signal if the measured ground electric parameter is higher than the default threshold value. The present invention simplifies the design of the transmitter open fault measuring device and decreases the production cost. Besides, the present invention increases anti-interference performance of the measuring device.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of detection method and device of open circuit fault of transmitter.
Background technology
In mobile communication system, radio frequency sending set is used to radiofrequency signal be amplified and be emitted in the space, its quality and stability are had strict requirement, so its manufacturing cost is higher.
Radio frequency sending set is made up of up-conversion, RF small signals amplifier, RF high power amplifier, duplexer or mixer, antenna usually.Be connected by cable between radio-frequency power amplifier and duplexer or the mixer.Come off or open failure if stube cable takes place when transmitter is worked, the high-power RF signal that should be emitted in the space will be connected device reflected back transmitter, cause transmitter to burn.
Generation for fear of the problems referred to above, prior art provides a solution, as shown in Figure 1: power amplifier 100 links to each other with the port one of circulator 102, its port 3 connects an end of RF high power attenuator 110, its port 2 connects coupler 104 port a, coupler port b links to each other with connector 106, and cable 107 links together connector 106 and duplexer 108.The other end of radio frequency amplifying power attenuator 110 links to each other with radio frequency wave detector 1112, and the d port of coupler 104 links to each other with wave detector 2114, and wave detector 1112 is connected to comparator 116 respectively with wave detector 2114, and the port 4 of comparator 116 is responsible for the outputting alarm signal.
When cable 107 came off or disconnects, the forward direction radiofrequency signal was connected the port 2 that device 106 reflexes to circulator, because the trend of the signal in the circulator is: 1 port advances, and 2 ports go out; 2 ports advance, and 3 ports go out.So the reverse radio-frequency signal enters circulator 102 by port 2, export the RF high power attenuator to by port 3.Cause it to burn with regard to having avoided reverse radio-frequency signal ingoing power amplifier 100 like this.In order to realize the alarm function of open circuit fault of transmitter, reverse radio-frequency signal after 110 decay of RF high power attenuator enters radio frequency wave detector 1112 and carries out power detection, export radio frequency wave detector 2114 by the forward direction radiofrequency signal of coupler 104 sampling to by port d and carry out power detection, the testing result of described two wave detectors is input to comparator 116, comparator 116 is the ratio of forward direction radio-frequency powers and reverse radio-frequency power relatively, whether judges the outputting alarm signal according to predefined power ratio thresholding.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art scheme:
Prior art is by detecting radio frequency forward power and radio frequency backward power, confirm by the size that compares forward power and backward power whether connector connects, need at least one radio-frequency (RF) coupler, two radio frequency wave detectors and a comparator, cost is higher, circuit complexity, reliability are not high.
Summary of the invention
Embodiments of the invention provide a kind of detection method of open circuit fault of transmitter, a kind of open circuit fault of transmitter checkout gear, and a kind of transmitter is with the purpose that realizes that open circuit fault of transmitter detects.
Embodiments of the invention provide a kind of open circuit fault of transmitter checkout gear, comprising:
The open fault detection module is used to detect the electric parameter over the ground of transmitter internal power amplifier out, if then output open circuit fault alarm signal or corresponding control signal when described electric parameter over the ground is higher than default threshold value; The detection module protective circuit, constitute by λ/4 microstrip lines, first electric capacity and second electric capacity, wherein said first electric capacity, one end links to each other with first port (7) of circulator, second port (5) of described circulator links to each other with described power amplifier output, the described first electric capacity other end links to each other with an end of described λ/4 microstrip lines, the other end of described λ/4 microstrip lines links to each other with an end of the input of described open fault detection module and described second electric capacity, the other end ground connection of described second electric capacity; Wherein, the 3rd port (6) of described circulator is used to connect RF high power attenuator or rf load, and the signal trend of described circulator is: second port (5) advances, and first port (7) goes out; First port (7) advances, and the 3rd port (6) goes out.
Embodiments of the invention provide a kind of transmitter, comprising:
The open fault detection module is used to detect the electric parameter over the ground of transmitter internal power amplifier out, if then output open circuit fault alarm signal or corresponding control signal when described electric parameter over the ground is higher than default threshold value; The detection module protective circuit, constitute by λ/4 microstrip lines, first electric capacity and second electric capacity, wherein said first electric capacity, one end links to each other with first port (7) of circulator, second port (5) of described circulator links to each other with described power amplifier output, the described first electric capacity other end links to each other with an end of described λ/4 microstrip lines, the other end of described λ/4 microstrip lines links to each other with an end of the input of described open fault detection module and described second electric capacity, the other end ground connection of described second electric capacity; Wherein, the 3rd port (6) of described circulator is used to connect RF high power attenuator or rf load, and the signal trend of described circulator is: second port (5) advances, and first port (7) goes out; First port (7) advances, and the 3rd port (6) goes out.
Compare with the prior art scheme, embodiments of the invention have following beneficial effect: 1) circuit is simple, and cost is low, need not radio frequency detection, amplification and comparison circuit; 2) anti-interference strong, need not to consider closing under the line state influence that another carrier wave or extraneous strong radiofrequency signal are disturbed.
Description of drawings
Fig. 1 is an open circuit fault of transmitter detection scheme schematic diagram in the prior art;
Fig. 2 is the detection method flow chart of open circuit fault of transmitter in the embodiments of the invention one;
Fig. 3 is the circuit theory diagrams of open fault checkout gear in the embodiments of the invention two;
Fig. 4 is the open circuit fault of transmitter checkout gear schematic diagram that has protective circuit in the embodiment of the invention two;
Fig. 5 is the schematic diagram that has the transmitter of open fault checkout gear in the embodiments of the invention three.
Embodiment
Embodiments of the invention utilize transmitter internal power amplifier out under the normal condition (also can be the connector input sometimes) to be direct-current short circuit over the ground or to be the principle of 50 ohm of low-resistances, whether occur unusually by the output electric parameter over the ground that detects amplifier in the transmitter, when open fault appears in transmitter, in time alarm with realization.
Below with reference to specific embodiments and the drawings, embodiments of the present invention are described further.
In the embodiments of the invention one, disclose a kind of detection method of open circuit fault of transmitter, as shown in Figure 2, comprised the steps:
The electric parameter over the ground of step S101, detection transmitter internal power amplifier out;
Above-mentioned electric parameter comprises dc resistance, dc voltage value, DC current values.D.C. resistance over the ground with detection transmitter internal power amplifier out is an example, utilizes the resistance to earth value of resistance detecting circuit or DC feedback network measuring transmitter internal power amplifier out.Above-mentioned resistance detecting circuit or DC feedback network can be made of devices such as NPN or positive-negative-positive bipolar transistor, resistance and electric capacity, or are made of any circuit or application-specific integrated circuit (ASIC) that can respond resistance change.The resistance to earth value of above-mentioned transmitter internal power amplifier out also can obtain by direct voltage or the direct current equivalence that detects this power amplifier output.
In order to make measured value more accurate; simultaneously also in order to protect above-mentioned resistance detecting circuit or DC feedback network; a detection module protective circuit can be set; be used for isolated DC interference signal and bypass Radio Frequency Interfere, this detection module protective circuit can be made of λ/4 microstrip lines and electric capacity.
Step S102,, detected electric parameter then determines open circuit fault of transmitter if being higher than default threshold value.
Still be example with the D.C. resistance over the ground that detects transmitter internal power amplifier out, in normal operation, transmitter internal power amplifier out is direct-current short circuit over the ground, or 50 ohm of low-resistances.When the stube cable between connector and duplexer or the mixer comes off or disconnects; when being transmitter generation open fault; the power amplifier output is (if this output is connected to protective circuit; then can detect the resistance to earth value by transmitter connector input) over the ground D.C. resistance will be greater than a threshold value; consider device difference; this threshold value can be set as the case may be, is greater than 50 ohm with this threshold settings usually.If utilize the direct voltage of detection transmitter internal power amplifier out or the method for direct current, corresponding direct voltage threshold value or direct current threshold value can be drawn by above-mentioned thresholding resistance value.
Surpass default threshold value if detect this power amplifier output dc resistance over the ground, then export the open circuit fault of transmitter alarm signal, this alarm signal can be carried out fault warning by the outer alarm lamp of excitation-emission machine, also this alarm signal can be transferred to base station controller or network management system and carry out the remote failure alarm.
In output open circuit fault of transmitter alarm signal, can close the power supply of transmitter or its internal power amplifier, by the reverse radio-frequency signal of transmitter connector reflected back transmitter is burnt preventing.
What adopt among the embodiment one is the method that electric parameter detects, and testing circuit is simple, and cost is low, good reliability.
In the embodiments of the invention two, provide a kind of open circuit fault of transmitter checkout gear:
With the D.C. resistance over the ground that detects transmitter internal power amplifier out is example, and the open fault checkout gear can adopt the DC feedback network design, its internal circuit schematic diagram as shown in Figure 3:
V1 is the operating voltage power supply port of open fault checkout gear, and capacitor C 1 is connected V1, other end ground connection with capacitor C 2 one ends; Resistance R 1 one termination V1, the base stage of another termination transistor T 1, resistance R 2 one termination V1, the collector electrode of another termination transistor T 1; P1 is the alarm signal output, i.e. the collector electrode of transistor T 1, and capacitor C 4 is connected other end ground connection with capacitor C 5 one ends with the collector electrode of T1; V2 is the direct current signal input of open fault checkout gear, that is the detection port of open fault checkout gear; Resistance R 3 one ends link to each other with V2, and the other end links to each other with the emitter of transistor T 1; The emitter of capacitor C 6 one termination transistor T1, other end ground connection; Capacitor C 7 one termination V2, other end ground connection.Transistor T 1 is the bipolar npn transistor npn npn.
When the transmitter connector when the cable of duplexer connects, V2 holds the resistance value on ground lower (for example resistance value is less than 50 ohm), transistor T 1 conducting, alarm signal output P1 output low level.When this cable did not connect, V2 held the resistance value on ground higher (for example resistance value is greater than 50 ohm), transistor T 1 pipe by, alarm signal output P1 exports high level.Alarming threshold can and be provided with corresponding capacitance resistance parameter by selection special transistor T1 and freely set.
The circuit design of the open fault alarm device that present embodiment provided is a preferred embodiment, so long as can measure and respond the circuit of electric parameter (comprising D.C. resistance or direct voltage or direct current) variation or the replacement circuit that integrated circuit all can be used as this open fault checkout gear.
Present embodiment also provides a kind of open circuit fault of transmitter checkout gear that has protective circuit, as shown in Figure 4:
This open fault checkout gear is made up of detection module protective circuit 200, open fault detection module 202; also can in said apparatus, add a power amplifier power supply control module 204, be implemented in the function of closing power amplifier or transmitter supply when there is open fault in transmitter.
Above-mentioned open circuit fault of transmitter checkout gear 205 has 3 ports, and port A1 is used to connect the output of power amplifier, and port A2 is used to connect the input of connector, and port A3 is used for the supply power voltage of output power amplifier or transmitter.
Open fault detection module 202, be used to detect transmitter internal power amplifier out (also can be the connector input sometimes) electric parameter over the ground, if this electric parameter is higher than default threshold value and then exports open circuit fault of transmitter alarm signal or corresponding control signal.If when the electric parameter of measuring is D.C. resistance, be greater than 50 ohm with this threshold settings usually.
Detection module protective circuit 200 is connected in the detection port of open fault detection module 202, is used for isolated DC interference signal and bypass Radio Frequency Interfere, makes measured value more accurate, and reduces the influence of 202 pairs of radio frequency main channels of open fault detection module.
Power amplifier power supply control module 204 is connected in the output of open fault detection module 202.Be used for according to the alarm signal of this port output or the power supply of corresponding control signals power amplifier or transmitter.When detecting alert signal of alarm or powered-down control signal, close the power supply of power amplifier or transmitter.
In addition, above-mentioned alarm signal can be carried out fault warning by the outer alarm lamp of excitation-emission machine, also can transfer to base station controller or network management system and carry out the remote failure alarm.
Open circuit fault of transmitter checkout gear in the present embodiment adopts the direct current detection scheme, and the anti-interference of circuit need not to consider closing under the line state by force, the influence that another carrier wave or extraneous strong radiofrequency signal are disturbed.
In the embodiments of the invention three, provide a kind of transmitter that has the open fault checkout gear, as shown in Figure 5:
Form by transmitter module 322, open fault detection module 312.
Also can in transmitter, add detection module protective circuit 324, transmitter module protective circuit 326, power amplifier power supply control module 310 further strengthens the open fault defencive function of transmitter.
Transmitter module protective circuit 326 is made up of circulator 302, RF high power attenuator 303.Between power amplifier and detection module protective circuit, be used to prevent transmitter module when open fault takes place, being reversed radiofrequency signal moment burns.Circulator 302 is used to guide the flow direction of radiofrequency signal, and RF high power attenuator 303 is used to consume the reverse radio-frequency signal, and above-mentioned RF high power attenuator also can be replaced by rf load.
Open fault detection module 312, be used to detect transmitter internal power amplifier out (also can be the connector input sometimes) electric parameter over the ground, if this electric parameter is higher than default threshold value and then exports open circuit fault of transmitter alarm signal or corresponding control signal, the output logic level is the control signal of " 1 " when for example open fault being arranged, during no open fault, the output logic level is the control signal of " 0 ".If when the electric parameter of measuring is D.C. resistance, usually this threshold value is made as greater than 50 ohm.
Detection module protective circuit 324; form by electric capacity 304, electric capacity 314, λ/4 microstrip lines 316; be used to isolate interference signal to open circuit fault detection module 324; electric capacity 304 is used for the direct current interference signal of isolation annular device port 7 one sides, and λ/4 microstrip lines 316, electric capacity 314 are used for the part reverse radio-frequency interference signal that bypass may enter open fault detection module 324.
Power amplifier power supply control module 310, the output that is connected in open fault detection module 312 is used for according to the alarm signal of open fault detection module 312 outputs or the power supply of corresponding control signals power amplifier or transmitter.
The concrete annexation of above-mentioned module is as follows:
The port 5 of circulator 302 links to each other with the output of power amplifier 300, its port 6 connects RF high power attenuator 303, its port 7 connects an end of electric capacity 304, the other end of electric capacity 304 links to each other with the input 9 of connector 306, the output 10 of connector 306 links to each other with the port one 4 of duplexer 308 by cable 307, its port one 5 connects antenna 320 by feeder line 318, λ/4 microstrip lines, 316 1 ends link to each other with the input 9 of connector 306, the other end links to each other with the port one 1 of open fault detection module 312, electric capacity 314 1 ends link to each other with port one 1, other end ground connection, the port 8 of open fault detection module 312 links to each other with the port one 2 of power amplifier power supply control module 310, and the port one 3 of power amplifier power supply control module 310 connects the power supply port 16 of power amplifier 300.
When cable 307 comes off or during open failure, to be connected device 306 by the radiofrequency signal of transmitter output reflects, this reverse radio-frequency signal enters the port 7 of circulator 302 by electric capacity 304, because the trend of the signal in the circulator 302 is: 5 ports advance, and 7 ports go out; 7 ports advance, and 6 ports go out.So after the reverse radio-frequency signal enters circulator 302, export RF high power attenuator 303 to by port 6.This RF high power attenuator 303 can consume the reverse radio-frequency signal that enters, and converts it into heat energy, to prevent that power amplifier is reversed radiofrequency signal at short notice and burns.
Open fault detection module 312 is measured connector input port 9 electric parameter over the ground (owing to increased transmitter module protective circuit and detection module protective circuit at the power amplifier output; here think that the output of power amplifier 300 is the input of connector 306); if when detecting connector input port 9 electric parameter be smaller or equal to the threshold value set over the ground; port 8 is with nowhere to turn to alert signal or corresponding control signal output; if when detect finding port 9 electric parameter be greater than the threshold value set over the ground, then by port 8 outputting alarm signal or corresponding control signal.After power amplifier power supply control module 310 receives alarm signal or corresponding control signal by port one 2, close the power supply of power amplifier 300, make transmitter stop to export radiofrequency signal.The alarm signal of open fault detection module also can report base station or base station manager or network management system simultaneously, realizes remote alarm.
The radio frequency sending set that embodiment three provides has the open fault measuring ability, when meeting open fault, can report to the police and closes power amplifier power supply automatically, avoids transmitter to be burnt, the reliability height, and cost is low.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (5)
1. an open circuit fault of transmitter checkout gear is characterized in that, comprising:
The open fault detection module is used to detect the electric parameter over the ground of transmitter internal power amplifier out, if then output open circuit fault alarm signal or corresponding control signal when described electric parameter over the ground is higher than default threshold value;
The detection module protective circuit, constitute by λ/4 microstrip lines, first electric capacity and second electric capacity, wherein said first electric capacity, one end links to each other with first port (7) of circulator, second port (5) of described circulator links to each other with described power amplifier output, the described first electric capacity other end links to each other with an end of described λ/4 microstrip lines, the other end of described λ/4 microstrip lines links to each other with an end of the input of described open fault detection module and described second electric capacity, the other end ground connection of described second electric capacity;
Wherein, the 3rd port (6) of described circulator is used to connect RF high power attenuator or rf load, and the signal trend of described circulator is: second port (5) advances, and first port (7) goes out; First port (7) advances, and the 3rd port (6) goes out.
2. open circuit fault of transmitter checkout gear as claimed in claim 1 is characterized in that, also comprises:
Power amplifier power supply control module links to each other with described open fault detection module output, is used for the power supply according to described corresponding control signals power amplifier or transmitter.
3. a transmitter comprises antenna, and power amplifier is characterized in that, also comprises:
The open fault detection module is used to detect the electric parameter over the ground of transmitter internal power amplifier out, if then output open circuit fault alarm signal or corresponding control signal when described electric parameter over the ground is higher than default threshold value;
The detection module protective circuit, constitute by λ/4 microstrip lines, first electric capacity and second electric capacity, wherein said first electric capacity, one end links to each other with first port (7) of circulator, second port (5) of described circulator links to each other with described power amplifier output, the described first electric capacity other end links to each other with an end of described λ/4 microstrip lines, the other end of described λ/4 microstrip lines links to each other with an end of the input of described open fault detection module and described second electric capacity, the other end ground connection of described second electric capacity;
Wherein, the 3rd port (6) of described circulator is used to connect RF high power attenuator or rf load, and the signal trend of described circulator is: second port (5) advances, and first port (7) goes out; First port (7) advances, and the 3rd port (6) goes out.
4. transmitter as claimed in claim 3 is characterized in that, also comprises:
Power amplifier power supply control module links to each other with described open fault detection module output, is used for the power supply according to described corresponding control signals power amplifier or transmitter.
5. transmitter as claimed in claim 4 is characterized in that, also comprises:
The transmitter module protective circuit links to each other with the power amplifier output, constitutes by described circulator, described RF high power attenuator, wherein:
Described circulator links to each other with described power amplifier output, is used to guide the flow direction of radiofrequency signal;
Described RF high power attenuator links to each other with described circulator, is used to consume the reverse radio-frequency signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100766379A CN101119119B (en) | 2007-08-23 | 2007-08-23 | Method and apparatus for detecting open circuit fault of transmitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100766379A CN101119119B (en) | 2007-08-23 | 2007-08-23 | Method and apparatus for detecting open circuit fault of transmitter |
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| CN101119119A CN101119119A (en) | 2008-02-06 |
| CN101119119B true CN101119119B (en) | 2010-12-22 |
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| CN2007100766379A Active CN101119119B (en) | 2007-08-23 | 2007-08-23 | Method and apparatus for detecting open circuit fault of transmitter |
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| CN105846852B (en) * | 2015-01-15 | 2018-12-18 | 明泰科技股份有限公司 | Radio-frequency unit and its adjusting method |
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| CN101119119A (en) | 2008-02-06 |
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