CN203522756U - Test device for power amplifier module of digital direct driver RF amplifier - Google Patents
Test device for power amplifier module of digital direct driver RF amplifier Download PDFInfo
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- CN203522756U CN203522756U CN201320663715.6U CN201320663715U CN203522756U CN 203522756 U CN203522756 U CN 203522756U CN 201320663715 U CN201320663715 U CN 201320663715U CN 203522756 U CN203522756 U CN 203522756U
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Abstract
A test device for a power amplifier module of a digital direct driver RF amplifier comprises the following components: an RF signal generator module, a power combiner mother board module, a power supply system module, an RF driving monitoring module, a dummy load circuit module and a cooling system module. The power combiner mother board module is connected with the RF signal generator module and the dummy load circuit module respectively. The test device for the power amplifier module of the digital direct driver RF amplifier is advantageous in that: (1) the test device realizes small volume, small weight, convenient movement through roller supporting legs, good cooling system and long-time electrification test for the tested module; and (2) the test device assists maintenance personnel in searching a fault point of a fault module, and the test device is a necessary test tool for multi-frequency transmitter maintenance personnel.
Description
Technical field
The utility model relates to a kind of testing apparatus, relates in particular to a kind of numeral and directly drives radio frequency amplifier power amplifier module testing apparatus.
Background technology
Multifrequency medium wave transmitter refers to the automatic tuning of a plurality of medium wave operating frequency, yet reach this target, from technological layer, have great difficulty, it only needs the reactance component that change volume and parameter are less just can easy to doly realize tuning object unlike shortwave or microwave.For medium wave, the volume ratio of the reactance component at tuning networking is huger, even if the less scope of frequency shift, reactance component parameter also varies widely scope, and this just gives in design and bring many unfavorable factors.In the global design of multifrequency medium wave transmitter, to reduce tuned circuit as far as possible, the mentality of designing that reduces tuned circuit is at the tuning networking of driving in advance and driving, we know: at DX-200 transmitter, change in frequency process at every turn, the large workload of tool that is all accompanied by tank circuit debugging and brings, wherein in driving in advance the tuning work of level, driving stage, especially driving stage is tuning more difficult, if the debugging of driving stage is inappropriate, in start experimentation, can cause the serious consequence of module damage in enormous quantities, this has just greatly improved and has changed cost frequently.
Proposed for these reasons a bold imagination, if save " cushion, drive in advance, driving stage ", adopted directly and drive, just can solve the trouble of bringing due to tuning problem, and overall efficiency also will improve.Through research and development and design, direct driving technologies is applied at DDDRA, " DDDRA " is that Digital Dirsct Driver RF Amplifier(numeral directly drives radio frequency amplifier) abbreviation, that numeral directly drives the core component of multifrequency medium wave transmitter, DDDRA-4KW power amplifier module testing apparatus is tester and the testing tool being born in research and development multifrequency medium wave transmitter process, can test two radio-frequency power amplifiers (the every exportable average power 2KW of radio-frequency power amplifier) simultaneously, from carrier frequency, input respectively, PA operating voltage, power output and according to the operating state research and development at machine and design.DDDRA power amplifier module testing apparatus plays very important effect in multifrequency transmitter, has solved the test and this key link of screening of multifrequency transmitter core component.
Summary of the invention
The purpose of this utility model is to provide a kind of numeral directly to drive radio frequency amplifier power amplifier module testing apparatus, this testing apparatus volume is little, lightweight, conveniently moving, cooling system are good, can add for a long time electrical testing tested module, be the testing tool of multifrequency transmitter attendant indispensability.
The utility model is achieved like this, it comprises that RF signal generator module, power combiner motherboard module, electric power system module, RF drive monitoring modular, dummy load circuit module, cooling system module, it is characterized in that: power combiner motherboard module connects respectively RF signal generator module and dummy load circuit module, electric power system module connects respectively RF signal generator module and RF drives monitoring modular, and cooling system module connects respectively RF and drives monitoring modular and dummy load circuit module.
Power combiner motherboard module described in the utility model is mainly comprised of radio-frequency driven distribution, the simulation of digital quantity, failure reset, high frequency magnetic core inductance, output transformer.
Electric power system module described in the utility model comprises that 220V Alternating Current Power Supply ,+12V power supply ,+48V power ,+250 V power four parts.
Dummy load circuit module described in the utility model is by load resistance R
0, the LC series resonant circuit that forms of inductance L, capacitor C.
The utility model has the advantages that: (1) testing apparatus volume is little, lightweight, adopt roller spike conveniently moving, cooling system is good, can add for a long time electrical testing tested module; (2) helping the fault point of attendant's looking up the fault module, is the testing tool of multifrequency transmitter attendant indispensability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is power combiner motherboard module diagram.
Fig. 3 is the load resistance connection layout in dummy load circuit module.
Fig. 4 is the universal resonance curve figure in dummy load circuit module.
In the drawings, 1, RF signal generator module 2, power combiner motherboard module 3, electric power system module 4, RF drive monitoring modular 5, dummy load circuit module 6, cooling system module.
Embodiment
As shown in Figure 1, the utility model is enforcement and design process are as follows: it comprises that RF signal generator module 1, power combiner motherboard module 2, electric power system module 3, RF drive monitoring modular 4, dummy load circuit module 5 and cooling system module 6; It is characterized in that: power combiner motherboard module 2 connects respectively RF signal generator module 1 and dummy load circuit module 5, electric power system module 3 connects respectively RF signal generator module 1 and RF drives monitoring modular 4, and cooling system module 6 connects respectively RF and drives monitoring modular 4 and dummy load circuit module 5.
1, the selection of RF signal generator module
MSO-X3024A series function/Arbitrary Waveform Generator that RF signal generator module 1 adopts Agilent company to produce; It can provide sine wave, square wave from 1uHz to 160MHz, and sawtooth waveforms output, also can change wave mode " frequency/period ", " amplitude/high level ", " skew/low level ", " start-phase "; Have four input channels, can contrast the output waveform of " full-bridge mode " work configuration of two modules simultaneously, this instrument is a signal generator and a four-way oscilloscope, is the first-selected instrument that transmitter is safeguarded.
2, the design of power combiner motherboard module
A kind of DDDRA power amplifier module testing apparatus of the present utility model can be tested two modules simultaneously, and power combiner motherboard module 2 designs according to the direct driving mode of operation of two modules, mainly following five parts, consists of:
(1) radio-frequency driven is distributed: as shown in Figure 2, and the 5V sending here from RF signal generator 1
p-Psquare-wave signal is to power combiner motherboard module 2, first through coupled mode, select (AC/DC) wire jumper, buffering to be partitioned to radio-frequency driven and distribute (MC100ELT22) chip, this chip is TTL-CMOS-PECS level transferring chip, chip internal by two independently TTL-CMOS-PECS level shifting circuit form, complete imbalance/balance translation function.If 2 inputs are connected in parallel, its output just obtains two (RF1+RF1-), (RF2+RF2-) waveform and the identical balanced signal of phase place, and these two balanced signals are delivered to respectively the rf inputs of two tested modules (full-bridge mode of operation).
(2) simulation of digital quantity: module control signal (ON/OFF) is provided by modulating-coding plate, the mode of operation of DDDRA power amplifier module is made as Low level effective, the control signal that modulating-coding plate is sent here is that low level module is open-minded, with two red bean switches, simulate respectively the control signal of two modules, one termination high level of switch, other end ground connection, opens/turn-offs control in order to module.
(3) failure reset: failure reset signal is made as Low level effective, with red bean switch, simulate, DDDRA power amplifier module has failed storage function, once the power supply of module, radio frequency, insurance open fault, just latch and go control board to process, just can reopen the test function of clothes closet after only having failure reset.
(4) high frequency magnetic core inductance: the high frequency magnetic core inductance by two 31uH left and right is composed in series, obtains good effect to the inhibition of high order harmonic component after the high frequency magnetic core inductance access of multifrequency transmitter, and volume reduces greatly, and waveform is comparatively level and smooth.
(5) output transformer: magnet ring adopts the output transformer magnet ring of upper machine motherboard, elementary is Double-wire parallel wound 15 circles, the secondary 6mm that uses
2multiply rubber sheathed wire is around 16 circles.
3, electric power system module
Electric power system module 3 is comprised of following four parts:
(1) 220V Alternating Current Power Supply: for MSO-X3024A series function/Arbitrary Waveform Generator, fan ,+48V ,+12V Switching Power Supply provide Alternating Current Power Supply; 3
380V Alternating Current Power Supply, for+250V rectifier provides Alternating Current Power Supply.
(2)+12V power supply :+12V directly delivers to power combiner motherboard module 2, adjustable regulator block output+5.5VDC in access module, for isolating chip and the testing circuit of module provides supply power voltage.
(3)+48V power supply :+48V directly delivers to power combiner motherboard module 2, DC converting in access module, is transformed into two groups ± 12VDC, for directly driving chip that supply power voltage is provided, when module is tested, can judge and directly drive chip operation normally whether by drive current.
(4)+250 V power supplies: adopt digital control stabilized voltage power supply, output adjustable range 0-250V, output current adjustable range 0-30A, 250 V stabilized voltage power supplys are directly delivered to power combiner motherboard module 2, for the field effect transistor of " full-bridge mode of operation " provides drain power; When module is tested, can select to start from every grade of the every 1V/ of 0-250V or every grade of stepping of 10V/, thus can be by module output amplitude and waveform judgement and screening module.
4, RF drives monitoring modular
DDDRA-4KW power amplifier module testing apparatus adopts D85-305 type digital direct current volometer to the detection of driving stage electric current, can in same instrument, show measured direct voltage and electric current simultaneously, tested direct voltage and direct current two-way are measured isolation completely in instrument, digital direct current volometer is that string is at+48V current supply circuit, by the demonstration of this table, can check intuitively the operating state of module drive level supply power voltage and electric current and module.
Directly drive radio frequency power amplification modules to adopt chip isolation technology, each piece module has an independently low-voltage power supply, and low-voltage power supply is through DC/DC converter, the power supply that output ± 12V is isolating chip by+48V; Isolating chip is to play buffer compartment from the function with final stage driving in the effect of module.DDDRA power amplifier module testing apparatus because module adopts directly, drives, the driving stage electric current of module is had to higher requirement, and driving stage electric current is the sign whether module normally works, so must be implemented the detection to the driving stage electric current of module.
5, the design of dummy load circuit module and calculating
Dummy load circuit module 5 is by load resistance R
0, the LC series resonant circuit that forms of inductance L, capacitor C, the design of dummy load is the selection course of resonant element parameter, for the high-power output tank circuit, only have with inductance and adopt the way of tap to solve expansion tuning range, when the design's dummy load circuit module 5, operating frequency is chosen as to 800KHZ.
(1) load resistance R
0selection
As shown in Figure 3, load resistance R
0be chosen as 32
/ 200W noninductive resistance series and parallel combines
/ 6.4KW, load resistance R
0being a dissipative cell, is a damping resistance of LC series resonant circuit, must consume the energy of resonance signal.When frequency input signal equals the resonance frequency f of LC series resonant circuit
0time, circuit generation series resonance, during series resonance the impedance of circuit minimum and be pure resistive (for capacitive is also for perceptual), therefore resonance impedance is Z
0=R.
(2) calculating of reactance component and selection
By following calculating, select the basic parameter of reactance component, but in order to expand tuning range, in practical circuit, must leave sufficient leeway, thus when coiling inductance respectively in 8uH, the tap of two, 15 uH place, the inductance value of end is 25uH; Capacitor C is formed by the fixedly vacuum ceramic Capacitance parallel connection of a vacuum ceramic tunable capacitor with the 2300P of OMC cabinet, a 1000P.
The concept of necessary quoting general resonance curve in the design's circuit and selection components and parts.
The expression formula of universal resonance curve is:
In formula: I
0loop response electric current during-resonance.
As shown in Figure 4, obviously, Q value is higher, and under certain frequency shift (FS), current ratio declines more severely.
In order to weigh the selective power of resonant circuit to different frequency, frequency range when amplitude drops to 0.707 times of peak value in definition universal resonance curve is relative passband B, that is:
Obviously, from universal resonance curve, can find out, Q value is higher, and passband B is narrower relatively, and the selectivity of circuit is better, and this illustrates that sensitivity is higher for receiving equipment, is one of major criterion of weighing receiving equipment quality.For Q value in the design at the high-power final stage tank circuit, should not select too highly, the means of in order to protect large-scale components and parts, often press low reactance-resistance ratio, widening passband reach the object that both take into account.For multifrequency transmitter machine, we need to have wider passband.If frequency f centered by 800KHZ
0; Passband B selects 400KHZ; R
0=
, just can obtain by relevant calculating formulas the basic parameter of reactance component.
By formula, obtained:
6, cooling system module
6 pairs of cooling objects of cooling system module adopt three kinds of different model seven desk fans; Its cooling object has three kinds, is respectively cooling, cooling, cooling to dummy load circuit to output transformer magnet ring to the field effect of tested module output stage.
To the cooling of tested module output stage field effect with to cooling employing Taiwan of output transformer magnet ring, produce the fan that model is FP-108EX, the fan that is MQ20060 to the cooling employing Fujian province spring electrical machinery plant production model of dummy load circuit module 5; 6 pairs of generation thermal source positions of cooling system module are forced cooling, and the temperature in rack is remained on not higher than ambient temperature 3
0within the scope of C.
DDDRA power amplifier module testing apparatus can be tested two modules simultaneously, the full-bridge type configuration that the field effect transistor that the final stage of every module is IRFP460LC by 8 models forms, output 2KW power, altogether 4KW power output all loss in 16 IRFP460LC field effects; For field effect, must there is good cooling effect, its normal operating state of guarantee; So in the both sides of module, perpendicular to field effect transistor fin direction, two Taiwan product models being installed is respectively that FP-108EX fan is forced cooling.
At DDDRA-4KW power amplifier module testing apparatus, carry out in test process, output transformer magnet ring and multi-functional magnetic core inductance temperature are up to 60
0more than C, so carry out cooling to output transformer magnet ring and multi-functional magnetic core inductance; It is that FP-108EX fan is cooling to its pressure that a Taiwan product model is installed in its dead ahead.
The cooling of dummy load circuit module 5 is a link of most critical, and the power output of 4KW is all dissipated on load resistance, and the type of cooling of load resistance must make air have good convection current, can smooth and easyly take away heat; So two the Fujian province spring electrical machinery plant production models that respectively fill into and out of place, air port in dummy load are that MQ20060 tetra-desk fans are forced cooling to dummy load.
Claims (4)
1. a numeral directly drives radio frequency amplifier power amplifier module testing apparatus, it comprises that RF signal generator module, power combiner motherboard module, electric power system module, RF drive monitoring modular, dummy load circuit module, cooling system module, it is characterized in that: power combiner motherboard module connects respectively RF signal generator module and dummy load circuit module, electric power system module connects respectively RF signal generator module and RF drives monitoring modular, and cooling system module connects respectively RF and drives monitoring modular and dummy load circuit module.
2. a kind of numeral according to claim 1 directly drives radio frequency amplifier power amplifier module testing apparatus, it is characterized in that: described power combiner motherboard module is mainly comprised of radio-frequency driven distribution, the simulation of digital quantity, failure reset, high frequency magnetic core inductance, output transformer.
3. a kind of numeral according to claim 1 directly drives radio frequency amplifier power amplifier module testing apparatus, it is characterized in that: described electric power system module comprises that 220V Alternating Current Power Supply ,+12V power supply ,+48V power ,+250 V power four parts.
4. a kind of numeral according to claim 1 directly drives radio frequency amplifier power amplifier module testing apparatus, it is characterized in that: described dummy load circuit module is by load resistance R
0, the LC series resonant circuit that forms of inductance L, capacitor C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320663715.6U CN203522756U (en) | 2013-10-25 | 2013-10-25 | Test device for power amplifier module of digital direct driver RF amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320663715.6U CN203522756U (en) | 2013-10-25 | 2013-10-25 | Test device for power amplifier module of digital direct driver RF amplifier |
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| Publication Number | Publication Date |
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| CN203522756U true CN203522756U (en) | 2014-04-02 |
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|---|---|---|---|
| CN201320663715.6U Expired - Fee Related CN203522756U (en) | 2013-10-25 | 2013-10-25 | Test device for power amplifier module of digital direct driver RF amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104102192A (en) * | 2014-06-27 | 2014-10-15 | 中国科学院等离子体物理研究所 | Broadband high power radio frequency transmitter debugging method |
| CN113189425A (en) * | 2021-04-30 | 2021-07-30 | 上海市医疗器械检验研究院 | System and method for testing reliability of radio frequency power amplifier |
-
2013
- 2013-10-25 CN CN201320663715.6U patent/CN203522756U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104102192A (en) * | 2014-06-27 | 2014-10-15 | 中国科学院等离子体物理研究所 | Broadband high power radio frequency transmitter debugging method |
| CN104102192B (en) * | 2014-06-27 | 2017-01-11 | 中国科学院等离子体物理研究所 | Broadband high power radio frequency transmitter debugging method |
| CN113189425A (en) * | 2021-04-30 | 2021-07-30 | 上海市医疗器械检验研究院 | System and method for testing reliability of radio frequency power amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHOU GUANGCHENG Free format text: FORMER OWNER: CENG LIN Effective date: 20140505 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140505 Address after: 330046 Jiangxi Province, Nanchang Qingshan Lake Hongdu Avenue No. 205 561 Patentee after: Zhou Guangcheng Address before: 330046 Jiangxi Province, Nanchang Qingshan Lake Hongdu Avenue No. 205 561 Patentee before: Zeng Lin |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20141025 |
|
| EXPY | Termination of patent right or utility model |