CN207706459U - A kind of shortwave automatic power-controlling device - Google Patents
A kind of shortwave automatic power-controlling device Download PDFInfo
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- CN207706459U CN207706459U CN201721900724.7U CN201721900724U CN207706459U CN 207706459 U CN207706459 U CN 207706459U CN 201721900724 U CN201721900724 U CN 201721900724U CN 207706459 U CN207706459 U CN 207706459U
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Abstract
The utility model belongs to electronics and field of communication technology, discloses a kind of shortwave automatic power-controlling device, including：Sequentially connected gain control unit, power amplifier, power sampling unit, and the signal processing unit that is connected between power sampling unit and gain control unit；Wherein, the signal input part of gain control unit connects RF signal input end, the signal input part of the signal output end connection power amplifier of gain control circuit, the signal input part of the signal output end connection power sampling unit of power amplifier, the signal input part of the sampling output end connection signal processing unit of power sampling unit, the control signal input of the feedback signal output connection gain control unit of signal processing unit, solves the problems, such as that the shortwave Power control dynamic range in 1.6MHz~30MHz frequency ranges is small, decaying is big, reliability is low.
Description
Technical field
The utility model belongs to electronics and field of communication technology more particularly to a kind of shortwave automatic power-controlling device, can
It control effectively for the power to the serial power amplifier such as 20W~400W.
Background technology
With the development of domestic and international technology, the function of communications electronics product is stronger and stronger, from initially simple simulation, number
Word signal processing also updates therewith to present multiband, high-speed frequency-hopping, web development, electronic device.
The core devices of previous power control circuit are PIN diodes, by applied voltage, form variable gain
Attenuator, component used is more, and poor reliability, dynamic range is small, and control range is narrow, and big signal easy tos produce non-linear distortion.
Utility model content
In view of the above-mentioned problems, the purpose of this utility model is to provide a kind of shortwave automatic power-controlling device, solve
The problem that shortwave Power control dynamic range in 1.6MHz~30MHz frequency ranges is small, decaying is big, reliability is low.
In order to achieve the above objectives, the utility model adopts the following technical solution is achieved.
A kind of shortwave automatic power-controlling device, carries out automatically controlling for the output power to shortwave power amplifier,
The shortwave automatic power-controlling device includes：Sequentially connected gain control unit, power amplifier, power sampling unit,
And it is connected to the signal processing unit between the power sampling unit and the gain control unit；
Wherein, the signal input part of the gain control unit connects RF signal input end, the gain control circuit
Signal output end connect the signal input part of the power amplifier, described in the signal output end connection of the power amplifier
The signal input part of power sampling unit, the sampling output end of the power sampling unit connect the letter of the signal processing unit
The feedback signal output of number input terminal, the signal processing unit connects the control signal input of the gain control unit
End.
It the characteristics of technical solutions of the utility model and is further improved to：
(1) the power sampling unit, the forward power letter of the radiofrequency signal for obtaining the power amplifier output
Number and backward power signal, the forward power signal and the backward power signal are converted into corresponding forward power respectively
DC level and backward power DC level；And the forward power DC level and backward power DC level are sent respectively
To the signal processing unit；
The signal processing unit compares for the forward power level to receiving with preset first reference voltage
Compared with generating the first error signal, and first error signal is amplified, to obtain gain control signal, and will be described
Gain control signal is sent to gain control unit；
The signal processing unit is additionally operable to the reverse power levels to receiving and is carried out with preset second reference voltage
Compare generation fault-signal, and the fault-signal is sent to gain control unit；The fault-signal indicates for high level
The power amplifier breaks down, and the fault-signal is that low level indicates that the power amplifier does not break down；
The gain control unit, the amplitude for adjusting input radio frequency signal according to the gain control signal, and
Reverse power protection is carried out by fault-signal.
(2) the power sampling unit, the radiofrequency signal for exporting the power amplifier pass through sample coil T1
It is simple, to generate forward power signal and backward power signal respectively at the secondary both ends of the sample coil, then by institute
It states forward power signal and backward power signal and passes through diode rectification respectively, obtain corresponding forward power DC level and anti-
To power DC level.
(3) gain control unit is realized using AD8368 chips.
(4) the AD8368 chips are provided with RF signal input end IN, RF signal output OUT, gain control end
GAIN and Enable Pin ENBL；
Wherein, the RF signal input end IN input radio frequency signals, the RF signal output OUT connections work(
The signal input part of rate amplifier, the gain control end GAIN connect the gain control letter of the signal processing unit output
Number, the Enable Pin ENBL connects the fault-signal of the signal processing unit output.
(5) the Enable Pin ENBL connects the fault-signal of the signal processing unit output；The Enable Pin ENBL is low
Level is effective；
When the fault-signal is high level, the power amplifier breaks down, and the AD8368 chips do not work；
When the fault-signal is low level, the power amplifier does not break down, the normal work of AD8638 chips
Make.
The utility model, as core devices, forms a novel shortwave automated power control using variable gain amplifier
Device has outstanding gain ranging, consistency and flatness, it can be achieved that high-performance Distinct matrix.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of structural schematic diagram for shortwave automatic power-controlling device that the utility model embodiment provides；
Fig. 2 is the circuit theory schematic diagram for the power sampling unit that the utility model embodiment provides；
Fig. 3 is the circuit theory schematic diagram for the signal processing unit that the utility model embodiment provides；
Fig. 4 is the circuit theory schematic diagram for the gain control unit that the utility model embodiment provides；
Fig. 5 is the circuit theory schematic diagram for the power supply unit that the utility model embodiment provides.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
The utility model embodiment provides a kind of shortwave automatic power-controlling device, for the defeated of shortwave power amplifier
Go out power to carry out automatically controlling, as shown in Figure 1, the shortwave automatic power-controlling device includes：Sequentially connected gain control
Unit, power amplifier, power sampling unit, and be connected between the power sampling unit and the gain control unit
Signal processing unit；
Wherein, the signal input part of the gain control unit connects RF signal input end, the gain control circuit
Signal output end connect the signal input part of the power amplifier, described in the signal output end connection of the power amplifier
The signal input part of power sampling unit, the sampling output end of the power sampling unit connect the letter of the signal processing unit
The feedback signal output of number input terminal, the signal processing unit connects the control signal input of the gain control unit
End.
Specifically,
The power sampling unit, the forward power signal of the radiofrequency signal for obtaining power amplifier output and
The forward power signal and the backward power signal are converted into corresponding forward power direct current by backward power signal respectively
Level and backward power DC level；And the forward power DC level and backward power DC level are sent respectively to institute
State signal processing unit；Its physical circuit schematic diagram is as shown in Figure 2.
The signal processing unit compares for the forward power level to receiving with preset first reference voltage
Compared with generating the first error signal, and first error signal is amplified, to obtain gain control signal, and will be described
Gain control signal is sent to gain control unit；
The signal processing unit is additionally operable to the reverse power levels to receiving and is carried out with preset second reference voltage
Compare generation fault-signal, and the fault-signal is sent to gain control unit；The fault-signal indicates for high level
The power amplifier breaks down, and the fault-signal is that low level indicates that the power amplifier does not break down；It has
Body circuit diagram is as shown in Figure 3.
With reference to figure 3, potentiometer RP4 is adjusted, changes the reference voltage of dc amplifier, required watt level can be obtained.
The error signal of forward power sampling voltage generation compared with reference voltage is amplified through dc amplifier several times, forms control electricity
Press CONT.
Potentiometer RP5 is adjusted, changes the reference voltage of dc amplifier, required reverse power protection value can be obtained.Instead
A high level is generated compared with reference voltage to power sampling voltage, signal is controlled as reverse power protection.The signal makes
V22, V21, V23 conducting are obtained, a fault-signal FAULT is generated, simultaneous faults indicator light V26 is lighted.
The gain control unit, the amplitude for adjusting input radio frequency signal according to the gain control signal, and
Reverse power protection is carried out by fault-signal.
The power sampling unit, the original that the radiofrequency signal for exporting the power amplifier passes through sample coil T1
Grade, to generate forward power signal and backward power signal respectively at the secondary both ends of the sample coil, then by it is described just
Pass through diode rectification respectively to power signal and backward power signal, obtains corresponding forward power DC level and reversed work(
Rate DC level.
With reference to figure 2, radiofrequency signal is by sample coil T1, respectively in secondary both ends generation forward power sampled signal and instead
To power sampled signal, by V12, V10 diode rectification, forward power voltage corresponding with radio-frequency power and anti-is respectively obtained
To power voltage.The key of sample circuit is the radiofrequency signal of different frequency, and obtained sampling voltage should be consistent as far as possible, this
The control of sample forward power may keep the same, and directional power protection may be on a threshold values.This circuit is by choosing not
Same magnetic material, compares the inductive signal of different radio frequency frequency, has filtered out one group of sample coil so that forward power
Voltage flatness is less than 0.1V.
Further, the gain control unit is realized using AD8368 chips, physical circuit schematic diagram such as Fig. 4 institutes
Show.
The AD8368 chips are provided with RF signal input end IN, RF signal output OUT, gain control end
GAIN and Enable Pin ENBL；
Wherein, the RF signal input end IN input radio frequency signals, the RF signal output OUT connections work(
The signal input part of rate amplifier, the gain control end GAIN connect the gain control letter of the signal processing unit output
Number, the Enable Pin ENBL connects the fault-signal of the signal processing unit output.
The Enable Pin ENBL connects the fault-signal of the signal processing unit output；The Enable Pin ENBL low levels
Effectively；When the fault-signal is high level, the power amplifier breaks down, and the AD8368 chips do not work；Work as institute
It states power amplifier when fault-signal is low level not break down, the AD8638 chips normal work.
With reference to figure 4, radiofrequency signal is coupled to input pin through C3, is exported through C15.Control signal is added to by R1 and R2 partial pressures
Gain control end, controls output amplitude, and failure control signal is added to the Enable Pin (low level is effective) of device, can make at amplifier
In dormant state, to play the role of reverse power protection.
It should be noted that the utility model design principle is taken out and forward power size pair by power sample circuit
The forward power level and reverse power levels corresponding with backward power size answered.Forward power level is used for power control,
Reverse power levels are protected for standing-wave ratio.
Forward power level amplifies by error signal, is added to variable gain amplifier (gain control i.e. described above
Unit) gain control end.By the way that pin MODE is pulled to positive voltage or ground voltage, gain can be respectively set as gain control
The increasing function or subtraction function of voltage processed.In the case where drawing high the gain ascending fashion of MODE pins, gain with gain voltage rising
And increase.In the case where dragging down the gain drop mode of MODE pins, gain declines with the rising of gain voltage.It works at two kinds
Under pattern, as VGAIN changes to 900mV from 100mV, gain control slope can be in temperature, power supply and processing variation range
It is maintained at+37.5dB/V or -38dB/V.
The gain function difference drawn high or dragged down after MODE is as follows：
(dB)=37.5 × VGAIN-14 is drawn high in gain
Gain drags down (dB)=- 38 × VGAIN+24.8
Wherein, VGAIN is indicated with V.
Reverse power levels pass through the standing-wave ratio threshold values of comparator setting, are added to the ends ENBL of variable gain amplifier.
ENBL ground connection can enter complete power down mode, and device does not work, and power consumption is less than 3mA at this time.
Based on above-mentioned principle, the technical concept of the utility model is：Using a variable gain amplifier as power output
The forward power signal handled well is input to control terminal, then be equipped with biased electrical by the adjusting device of size according to theoretical calculation
Road, constitutes complete automatic power control circuit, realize big signal in 1.6MHz~30MHz frequency ranges, Larger Dynamic, low-power consumption control
Index request processed.
Further, the shortwave automatic power-controlling device further includes power supply unit, and the power supply unit is that direct current is steady
Volt circuit, for powering respectively to the signal processing unit, the sampling unit and the gain control unit, specific electricity
Road schematic diagram is as shown in Figure 5.
With reference to figure 5, L5 and C51, C49 composition LC filters utilize them in this way, when there is very strong RF magnetic field
Voltage calibrator can be protected.C50, C55, C56 form power supply output filter, are filtered out respectively to the interference of different frequency,
Keep voltage ripple minimum.
Above-mentioned gain control unit (i.e. variable gain amplifier) is made of a single-ended VGA, bandwidth 800MHz, 34dB increasing
Beneficial control range is -12dB to+22dB.Accurate linear gain control can be achieved, there is the outstanding linearity (OIP3) and make an uproar
Sonic system number (NF).When maximum gain, OIP3 33dBm, output background noise is -143dBm/Hz, and corresponding when maximum gain is made an uproar
Sonic system number is 9.5dB.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in computer read/write memory medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or CD
Etc. the various media that can store program code.
Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain that profit requires.
Claims (6)
1. a kind of shortwave automatic power-controlling device, carries out automatically controlling for the output power to shortwave power amplifier,
It is characterized in that, the shortwave automatic power-controlling device includes：Sequentially connected gain control unit, power amplifier, power
Sampling unit, and the signal processing unit that is connected between the power sampling unit and the gain control unit；
Wherein, the signal input part of the gain control unit connects RF signal input end, the letter of the gain control circuit
Number output end connects the signal input part of the power amplifier, and the signal output end of the power amplifier connects the power
The signal input part of sampling unit, the signal that the sampling output end of the power sampling unit connects the signal processing unit are defeated
Enter end, the feedback signal output of the signal processing unit connects the control signal input of the gain control unit.
2. a kind of shortwave automatic power-controlling device according to claim 1, which is characterized in that
The power sampling unit, the forward power signal of the radiofrequency signal for obtaining power amplifier output and reversed
The forward power signal and the backward power signal are converted into corresponding forward power DC level by power signal respectively
With backward power DC level；And the forward power DC level and backward power DC level are sent respectively to the letter
Number processing unit；
The signal processing unit is compared production for the forward power level to receiving with preset first reference voltage
Raw first error signal, and first error signal is amplified, to obtain gain control signal, and by the gain
Control signal is sent to gain control unit；
The signal processing unit is additionally operable to the reverse power levels to receiving and is compared with preset second reference voltage
Fault-signal is generated, and the fault-signal is sent to gain control unit；The fault-signal is described in high level indicates
Power amplifier breaks down, and the fault-signal is that low level indicates that the power amplifier does not break down；
The gain control unit, the amplitude for adjusting input radio frequency signal according to the gain control signal, and pass through
Fault-signal carries out reverse power protection.
3. a kind of shortwave automatic power-controlling device according to claim 2, which is characterized in that
The power sampling unit, radiofrequency signal for exporting the power amplifier by the simple of sample coil, from
And generate forward power signal and backward power signal respectively at the secondary both ends of the sample coil, then by the forward power
Signal and backward power signal pass through diode rectification respectively, obtain corresponding forward power DC level and backward power direct current
Level.
4. a kind of shortwave automatic power-controlling device according to claim 2, which is characterized in that the gain control unit
It is realized using AD8368 chips.
5. a kind of shortwave automatic power-controlling device according to claim 4, which is characterized in that the AD8368 chips are set
It is equipped with RF signal input end IN, RF signal output OUT, gain control end GAIN and Enable Pin ENBL；
Wherein, the RF signal input end IN input radio frequency signals, the RF signal output OUT connections power are put
The signal input part of big device, the gain control end GAIN connect the gain control signal of the signal processing unit output, institute
State the fault-signal that Enable Pin ENBL connects the signal processing unit output.
6. a kind of shortwave automatic power-controlling device according to claim 5, which is characterized in that the Enable Pin ENBL connects
Connect the fault-signal of the signal processing unit output；The Enable Pin ENBL low levels are effective；
When the fault-signal is high level, the power amplifier breaks down, and the AD8368 chips do not work；
When the fault-signal is low level, the power amplifier does not break down, the AD8638 chips normal work.
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| CN201721900724.7U CN207706459U (en) | 2017-12-29 | 2017-12-29 | A kind of shortwave automatic power-controlling device |
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| CN201721900724.7U CN207706459U (en) | 2017-12-29 | 2017-12-29 | A kind of shortwave automatic power-controlling device |
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| CN207706459U true CN207706459U (en) | 2018-08-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112468213A (en) * | 2020-11-09 | 2021-03-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Signal receiving and transmitting control method of Beidou active antenna |
-
2017
- 2017-12-29 CN CN201721900724.7U patent/CN207706459U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112468213A (en) * | 2020-11-09 | 2021-03-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Signal receiving and transmitting control method of Beidou active antenna |
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