CN206135829U - Power amplifier system - Google Patents
Power amplifier system Download PDFInfo
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- CN206135829U CN206135829U CN201621226469.8U CN201621226469U CN206135829U CN 206135829 U CN206135829 U CN 206135829U CN 201621226469 U CN201621226469 U CN 201621226469U CN 206135829 U CN206135829 U CN 206135829U
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- power amplifier
- protection
- amplifier system
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Abstract
The utility model provides a power amplifier system, it includes power amplifier and the output open circuit protection circuit that is used for power amplifier, output open circuit protection circuit includes the state test section, relatively judge subtotal protection execution unit, state test section real -time detection follows the forward signal of power amplifier's output port output and follows the reflected signal of power amplifier system's output port reflection, and with the data transmission that detects to relatively judging the part, judge relatively that the part compares these data and predetermined shutter limit value, and export protection execution unit with the comparative result, protection execution unit makes corresponding action according to the comparative result, the state test section is including difference coupling forward signal and reflected signal's coupling element, make the coupling of two kinds of signals separately. Consequently, the reflected signal in the circuit is not influenced by forward coupled signal, judge relatively that the part is more accurate, can realize more accurate protection to power amplifier.
Description
Technical field
The utility model is related to power amplifier system, more particularly, to including radio-frequency power amplifier and radio frequency work(
The system of the output end open loop protection circuit of rate amplifier.
Background technology
Radio-frequency power amplifier is easily damaged as the most final stage of communication system because high-power.Further, since power
Amplifier is a kind of relatively expensive device, therefore necessary protection circuit is necessary.Power amplifier is caused to damage
The reason for have a lot, such as electrostatic, surge, overheated, over-pressed, excessively stream, overload etc..
Output end is opened a way and causes RF energy from effectively transferring out, and most of energy is converted into heat energy, causes work(
Rate amplifier heat is burnt.In engineering in practice, existing power amplifier system includes power amplifier and for the power
The output end open loop protection circuit of amplifier, the output end open loop protection circuit is opened a way for output end and is transshipped and carries out simultaneously
Protection.
Fig. 1 illustrates the basic structure of existing typical power amplifier system.As shown in figure 1, existing power amplifier
Output end open loop protection circuit be made up of following part：
State detection portion, it passes through coupler and wave detector real-time detection correlation behavior amount；
Multilevel iudge part, it makes the data from state detection portion be compared with default protection threshold value, root
According to comparative result corresponding data are exported to protection executable portion；And
Protection executable portion, it makes corresponding protection act, i.e. output end according to the data from multilevel iudge part
Rupturing duty pipe drain electrode power supply, reaches the purpose of protection power amplifier during open circuit.
However, in current power amplifier system, because output end open loop protection circuit is while open-circuit-protection
Overload protection is carried out, the coupler of state detection portion is coupled to the forward signal of overload protection and for open-circuit-protection simultaneously
Reflected signal so that reversely rectified signal is easily affected by forward direction rectified signal, causes the output end in power amplifier system
In the case of standing wave is preferable, reverse rectified signal is also larger, so as to cause the reverse protection threshold value of multilevel iudge part more difficult
Arrange, if arranges value is less, protection by mistake can be caused, if arranges value is larger, do not have protective effect.
Utility model content
Reverse rectified signal is easily affected by positive rectified signal in solve the problems, such as prior art, mesh of the present utility model
Be to power amplifier system of the prior art in the output end open loop protection circuit for power amplifier in
State detection portion is improved, and provides a kind of new power amplifier system so that putting for power in the system
Reflected signal in the output end open loop protection circuit of big device is not affected by positive coupled signal, so that protecting the threshold value can be with
Arrange relatively reasonable.
According to power amplifier system of the present utility model, it includes power amplifier and for the power amplifier
Output end open loop protection circuit, the output end open loop protection circuit includes state detection portion, multilevel iudge part and protection
Executable portion, forward signal that the state detection portion real-time detection is exported from the output port of the power amplifier and from
The reflected signal of the output port reflection of the power amplifier system, and by the data is activation for detecting to multilevel iudge portion
Point, the multilevel iudge part will be compared from the data of state detection portion with default protection threshold value, and will compare
The output of relatively result is to protection executable portion, and the protection executable portion makes phase according to the comparative result of multilevel iudge part
The action answered, the state detection portion includes coupling the coupling element of forward signal and reflected signal respectively so that forward direction letter
Number and reflected signal coupling separate.
Preferably, according to power amplifier system of the present utility model, the coupling element for coupling forward signal is orientation coupling
Clutch, the coupling element of coupled reflection signal is circulator, and the circulator is closer compared to the directional coupler
The output port of the power amplifier system.
Preferably, according to power amplifier system of the present utility model, the reverse coupled port of the directional coupler connects
Load is grounded.
Preferably, according to power amplifier system of the present utility model, the state detection portion also includes the first detection
Device and second detector, the positive coupling port of the directional coupler is connected with the first detector, the circulator with
The second detector connection.
Preferably, according to power amplifier system of the present utility model, the circulator is realized by another directional coupler.
Preferably, according to power amplifier system of the present utility model, the positive coupled end of another directional coupler
Mouth connects load or is grounded.
Preferably, according to power amplifier system of the present utility model, the isolation of the circulator is more than 20dB.
Preferably, it is in the multilevel iudge part that comparative result is defeated according to power amplifier system of the present utility model
In the case of going out for high level, the protection executable portion cuts off the power tube drain electrode power supply of the power amplifier.
Preferably, it is in the multilevel iudge part that comparative result is defeated according to power amplifier system of the present utility model
Go out in the case of low level, the power tube for protecting executable portion not cut off the power amplifier drain electrode power supply.
Preferably, according to power amplifier system of the present utility model, the protection executable portion includes two NPN types three
Pole pipe, a positive-negative-positive triode and a metal-oxide-semiconductor.
According to power amplifier system of the present utility model：Increase a ring in the state detection portion of existing protection circuit
Shape device, for coupled reflection signal, the coupling of forward signal is realized using directional coupler, makes forward signal with reflected signal
Coupling separates.Reflected signal Jing after detector, by the comparator in multilevel iudge part and the protection threshold value for presetting
It is compared and output result, protects executable portion that the guarantor to power amplifier is realized according to the result that multilevel iudge part exports
Shield.Protection executable portion realized using two NPN type triodes, a positive-negative-positive triode and metal-oxide-semiconductor, simple structure, into
This is cheap, be easily achieved.
The beneficial effects of the utility model are：Make the multilevel iudge part of output terminal protecting circuit of power amplifier more
Plus accurately, power amplifier can be realized more accurately to protect.
Description of the drawings
Fig. 1 is the structural representation for illustrating existing typical power amplifier system；
Fig. 2 is to illustrate the structural representation according to power amplifier system of the present utility model；
Fig. 3 is the structural representation of the operation principle for illustrating parallel coupled line directional coupler.
Specific embodiment
Below, referring to the drawings, the utility model is done by preferred embodiment and is further described in detail.Following examples
Only it is exemplary, and is in no way intended to limit protection domain of the present utility model.
Fig. 2 is to illustrate the structural representation according to power amplifier system of the present utility model.As shown in Fig. 2 the power
Amplifier system includes power amplifier PA and the output end open loop protection circuit for power amplifier, the protection circuit bag
Include：State detection portion 1, multilevel iudge part 2 and protection executable portion 3.
As shown in Fig. 2 radio-frequency input signals is input into from the rf inputs mouth RFIN of power amplifier, Jing power amplifiers
PA exports forward signal after amplifying, and when the standing wave of the output port RFOUT of power amplifier system is perfect condition, does not exist
Reflected signal, and when the standing wave of the output port RFOUT of power amplifier system is poor, some signal reflex is returned,
Form reflected signal.Above-mentioned forward signal is used for overload protection, and reflected signal is used for open-circuit-protection.
According to the output end open loop protection circuit of power amplifier of the present utility model, state detection portion 1 is used for real-time
Detect the forward signal that exports from the output port of power amplifier PA and anti-from the output port RFOUT of power amplifier system
The reflected signal penetrated and by the data is activation for detecting to multilevel iudge part 2.Multilevel iudge part 2 is used to examine from state
The data and default positive protection threshold value and reverse protection threshold value for surveying part 1 are compared, and will be with positive protection door
The comparative result output of limit value is protected to overload protecting circuit (not shown) by arriving with the output of the comparative result of reverse protection threshold value
Shield executable portion 3.Protection executable portion 3 makes corresponding protection act according to the data from multilevel iudge part 2.
The each part mentioned above of the output end open loop protection circuit of power amplifier of the present utility model is entered referring to Fig. 2
Row is described in detail.
As shown in Fig. 2 the state-detection in the output end open loop protection circuit of power amplifier of the present utility model
Part 1 includes：Coupler, circulator, wave detector D1 and wave detector D2.
In the utility model, the forward signal that radio-frequency input signals is exported Jing after power amplifier amplification is entered by coupler
Row coupling.Then, positive coupled signal enters multilevel iudge part 2 Jing after wave detector D1 detections is used for overload protection.Due to mistake
The content for carrying protection is identical with prior art, therefore repeats no more in the utility model.
Can be directional coupler according to coupler of the present utility model, it is preferable that can be oriented using parallel coupled line
Coupler.
The principle of parallel coupled line directional coupler is elaborated referring to Fig. 3.
As shown in figure 3, parallel coupled line directional coupler is by the main line line of top (in Fig. 3) and by-pass (below in Fig. 3
Line) constitute, the length of two parallel micro-strips is quarter-wave, during forward direction coupling, direction as shown by the arrows in Figure 3, letter
Number it is input into by port 21, port 22 exports, and port 23 is coupling port, and port 24 is isolated port.When signal is flowed by port 21
When to port 22, there is signal output at the port 23 in by-pass, in the ideal case, port 24 is reachable preferable without output
Isolation.
When the output port RFOUT standing waves of power amplifier system are perfect condition, signal is all exported by port 22,
There is no reflected signal, when the output port RFOUT standing waves of power amplifier system are poor, some signal reflex is returned
Come, referred to as reflected signal, reflected signal is input into by port 22, now port 24 is coupling port, port 23 is isolated port.By
Analysis above can be obtained, and parallel coupled line coupler is capable of achieving the coupling of port 23 forward signal, the coupled reflection signal of port 24.But hold
A parallel coupled line coupler can be formed between mouth 23 and port 24 again, the reflected signal of coupling can be subject to the positive letter for coupling
Number affect, cause coupled reflection signal inaccurate.
Therefore, it is different from the state detection portion of the output end open loop protection circuit of the power amplifier of prior art,
In the utility model, the reverse coupled port (port 24 in Fig. 3) of coupler is connected with wave detector, but is grounded or is connect
Load so as to reverse coupled can not be carried out.
On the other hand, as shown in figure 1, in the output end open loop protection circuit of the power amplifier of prior art, using
Same coupler is coupled to the forward signal and the reflected signal for open-circuit-protection of overload protection simultaneously so that reversely inspection
Ripple signal is easily affected by positive rectified signal, is caused in the case of the output end standing wave of power amplifier system is preferable, reversely
Rectified signal is also larger, so that the more difficult setting of reverse protection threshold value of multilevel iudge part, does not have protective effect.
For this purpose, the output end open loop protection circuit of power amplifier of the present utility model is carried out on the basis of existing technology
Improve.Specifically, a circulator is increased in state detection portion 1 for coupled reflection signal, so that positive
Signal separates with the coupling of reflected signal.
The situation of the reflected signal coupling according to the utility model in the case where increased circulator is carried out in detail below
Describe in detail bright.
When the output end of power amplifier system is opened a way (standing wave is poor), from the output port of radio frequency power amplifier system
The reflected signal that RFOUT is reflected is exported via the port 12 of circulator to port 13, then Jing wave detector D2 detections, enter than
It is used for open-circuit-protection compared with judgment part 2.Circulator is a kind of multiport device for making the unidirectional annular delivery of electromagnetic wave, electromagnetic wave
Transmission can only be transmitted along one direction, be reversely isolation.Due in circulator, signal flow direction be from port 11 to port 12 to
Port 13, reverse isolation, so forward signal from the port 11 of circulator to port 12 after export, reflected signal from port 12 to
Export for detection behind port 13, therefore reflected signal is not affected by forward signal.
In the utility model, the isolation of circulator is preferably greater than such as 20dB.Additionally, in the utility model, ring
Shape device can also be substituted with another directional coupler, in this case, make the positive coupled end of another directional coupler
Mouth connects load or is grounded, and reverse port is used for coupled reflection signal.
After state-detection described above, state detection portion 1 sentences the data is activation for detecting to comparing
Disconnected part 2.
Multilevel iudge part 2 in the output end open loop protection circuit of power amplifier of the present utility model includes ratio
Compared with device U1 and comparator U2.After circulator coupling, into wave detector D2, it is backward that wave detector D2 carries out detection to reflected signal
Comparator U2 exports reverse detecting circuit.Reverse detecting circuit is carried out with default reverse protection threshold value in comparator U2
Relatively.When signal is normally exported, reflected signal is less, and reverse detecting circuit value is less than reverse protection threshold value, comparator U2
Output low level, when the output end of power amplifier system is opened a way (standing wave is poor), reflected signal is larger, reverse detecting circuit value
More than reverse protection threshold value, comparator U2 output high level.
After above-mentioned multilevel iudge, comparator U2 is to protection executable portion 3 output high level or low level.Protection
Executable portion 3 makes corresponding protection act according to the data from multilevel iudge part 2.
Specifically, when comparator U2 exports high level, the power tube leakage of the rupturing duty amplifier of executable portion 3 is protected
Pole powers, and realizes defencive function.And when comparator U2 exports low level, the power tube drain electrode of power amplifier is normal confession
Electricity.
Protection executable portion 3 in the output end open loop protection circuit of power amplifier of the present utility model includes two
Individual NPN type triode T1, T2, a positive-negative-positive triode T3 and a metal-oxide-semiconductor.Triode T3 play be switched fast protection with not
The function of guard mode.When metal-oxide-semiconductor is switched to cut-off state from conducting state, T3 plays leakage current effect, makes protection work(
Can quickly realize.
Specially, on the one hand, when comparator U2 exports high level, the B extremely high level of triode T1, crystal is guaranteed adequate food
With so that C extremely low levels；And then so that the B extremely low levels of triode T2, transistor cutoff, E extremely low levels；Simultaneously
So that the B of triode T3 extremely low levels, transistor cutoff, E extremely low levels.The extremely low electricity of the G of metal-oxide-semiconductor from the above
Flat, metal-oxide-semiconductor is not turned on, and the D pole tensions of metal-oxide-semiconductor are that 0, i.e. power tube drain voltage are 0, realize the drain electrode power supply of rupturing duty pipe,
Realize defencive function.
On the other hand, when comparator U2 exports low level, the B extremely low levels of triode T1, transistor cutoff so that
C extremely high level；And then so that the B extremely high level of triode T2, transistor saturation, E extremely high level；Three poles are caused simultaneously
The B of pipe T3 extremely high level, transistor cutoff, E extremely high level.The G of metal-oxide-semiconductor extremely high level as from the foregoing, metal-oxide-semiconductor is led
Logical, the D pole tensions of metal-oxide-semiconductor are equal to S pole tensions, that is to say, that power tube drain electrode is normal power supply.
To sum up, according to power amplifier system of the present utility model, increase in the state detection portion of existing protection circuit
One circulator, for coupled reflection signal, the coupling of forward signal is realized using directional coupler, makes forward signal with reflection
The coupling of signal separates.Reflected signal Jing after wave detector D2 detections, by comparator U2 in multilevel iudge part with preset
Protection threshold value is compared and output result, protects executable portion to be realized to power according to the result that multilevel iudge part exports
The protection of amplifier.Protection executable portion utilizes two NPN type triodes, a positive-negative-positive triode and a metal-oxide-semiconductor to realize,
Simple structure, it is with low cost, be easily achieved.
Therefore the output end open loop protection circuit of power amplifier of the present utility model：The output end for making power amplifier is protected
The multilevel iudge part of protection circuit is more accurate, and power amplifier can be realized more accurately to protect.
Additionally, can be widely used for power amplifier output open-circuit-protection according to protection circuit of the present utility model, realize
Artificial maloperation or hardware failure caused by power amplifier system output end standing wave is poor in addition open circuit in the case of,
Protection Primary Component power tube is not damaged by, and the reliability to improving whole machine has critical significance.
Although being described to the utility model with reference to exemplary embodiment, but it is to be understood that the utility model is not
It is limited to disclosed exemplary embodiment.Most wide explanation should be given to scope of the following claims, so that it covers institute
There is the 26S Proteasome Structure and Function of these modified examples and equivalent.
Claims (10)
1. a kind of power amplifier system, it includes power amplifier and the output end open-circuit-protection for the power amplifier
Circuit, the output end open loop protection circuit includes state detection portion, multilevel iudge part and protection executable portion, the shape
State detection part real-time detection is from the forward signal of the output port output of the power amplifier and from the power amplifier
The reflected signal of the output port reflection of system, and by the data is activation for detecting to the multilevel iudge part, the comparison
Judgment part will be compared from the data of the state detection portion with default protection threshold value, and comparative result is defeated
Go out to the protection executable portion, and the protection executable portion makes phase according to the comparative result of the multilevel iudge part
The action answered, it is characterised in that the state detection portion includes coupling the coupling element of forward signal and reflected signal respectively,
So that the coupling of forward signal and reflected signal separates.
2. power amplifier system according to claim 1, it is characterised in that the coupling element of coupling forward signal is fixed
To coupler, the coupling element of coupled reflection signal is circulator, and the circulator is compared to the directional coupler more
Jie Jin the output port of the power amplifier system.
3. power amplifier system according to claim 2, it is characterised in that the reverse coupled end of the directional coupler
Mouth connects load or is grounded.
4. power amplifier system according to claim 2, it is characterised in that the state detection portion also includes first
Wave detector and second detector, the positive coupling port of the directional coupler is connected with the first detector, the annular
Device is connected with the second detector.
5. the power amplifier system according to Claims 2 or 3, it is characterised in that the circulator is by another orientation coupling
Clutch is realized.
6. power amplifier system according to claim 5, it is characterised in that the positive coupling of another directional coupler
Close port to connect load or be grounded.
7. power amplifier system according to claim 2, it is characterised in that the isolation of the circulator is more than
20dB。
8. power amplifier system according to claim 1, it is characterised in that will compare knot in the multilevel iudge part
In the case that fruit is output as high level, the protection executable portion cuts off the power tube drain electrode power supply of the power amplifier.
9. power amplifier system according to claim 1, it is characterised in that will compare knot in the multilevel iudge part
Fruit be output as it is low level in the case of, the power tube for protect executable portion not cut off power amplifier drain electrode is powered.
10. power amplifier system according to claim 1, it is characterised in that the protection executable portion includes two
NPN type triode, a positive-negative-positive triode and a metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621226469.8U CN206135829U (en) | 2016-11-15 | 2016-11-15 | Power amplifier system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621226469.8U CN206135829U (en) | 2016-11-15 | 2016-11-15 | Power amplifier system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206135829U true CN206135829U (en) | 2017-04-26 |
Family
ID=58562956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621226469.8U Active CN206135829U (en) | 2016-11-15 | 2016-11-15 | Power amplifier system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206135829U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412616A (en) * | 2018-10-30 | 2019-03-01 | 天津津航计算技术研究所 | A kind of radio frequency sending set open loop protection circuit and method |
| CN110445514A (en) * | 2019-07-11 | 2019-11-12 | 广州市杰汇信息科技有限公司 | A kind of GPS signal distribution system output end connecting detection device and method |
| CN110446247A (en) * | 2019-07-04 | 2019-11-12 | 维沃移动通信有限公司 | Signal control circuit, method and terminal device |
| CN112180337A (en) * | 2020-11-16 | 2021-01-05 | 南京天朗防务科技有限公司 | Fault detection device of power tube amplification module |
-
2016
- 2016-11-15 CN CN201621226469.8U patent/CN206135829U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412616A (en) * | 2018-10-30 | 2019-03-01 | 天津津航计算技术研究所 | A kind of radio frequency sending set open loop protection circuit and method |
| CN110446247A (en) * | 2019-07-04 | 2019-11-12 | 维沃移动通信有限公司 | Signal control circuit, method and terminal device |
| CN110445514A (en) * | 2019-07-11 | 2019-11-12 | 广州市杰汇信息科技有限公司 | A kind of GPS signal distribution system output end connecting detection device and method |
| CN112180337A (en) * | 2020-11-16 | 2021-01-05 | 南京天朗防务科技有限公司 | Fault detection device of power tube amplification module |
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