CN103117717B - Power amplifier and its implementation, transmitter and wireless drilling measuring system - Google Patents
Power amplifier and its implementation, transmitter and wireless drilling measuring system Download PDFInfo
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- CN103117717B CN103117717B CN201210533273.3A CN201210533273A CN103117717B CN 103117717 B CN103117717 B CN 103117717B CN 201210533273 A CN201210533273 A CN 201210533273A CN 103117717 B CN103117717 B CN 103117717B
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Abstract
The invention provides a kind of power amplifier and its implementation, transmitter and wireless drilling measuring system, the implementation method includes the voltage amplitude and current amplitude of power amplifier output-stage described in real-time detection and calculates output according to the voltage amplitude and current amplitude；The comparison output and calibration power, and the feedback control voltage of the power amplifier is adjusted according to comparative result；According to the supply voltage that the feedback control voltage adjusts the power amplifier output-stage, and then control the output of the power amplifier output-stage.The present invention solve the problems, such as power amplifier cannot self adaptation mated, and then the beneficial effect with Adaptive matching.
Description
Technical field
The present invention relates to electro-mechanical arts, in particular to a kind of power amplifier and its implementation, transmitter and
Wireless drilling measuring system.
Background technology
In the development of resources such as oil, mine drilling process, substantial amounts of information is as drilling real-time Transmission is to ground, electromagnetic wave
Transmission is a kind of effective transmission means.Underground signal discharger includes：Transmitting antenna（Non-symmetrical dipole）And transmitting
Machine.As formation resistivity changes with the change of depth, and transmitting antenna equiva lent impedance changes with formation resistivity difference,
When formation resistivity is in 1 Ω m～1000 Ω m, antenna equiva lent impedance is about 0.1 Ω～50 Ω.Simultaneously as stratum
It is lossy dielectric, electromagnetic wave is very big in stratum transmission attenuation, adapts to the wave frequency scope of stratum transmission：0～30Hz.Drilling well
During discharger be installed in down-hole equipment, narrow space, work under bad environment should bear the antidetonation in drilling process
Dynamic, shock resistance, output relatively high power is beneficial to ground receiving wastewater facility reception signal again.Therefore, transmitter power amplifier sets
Meter needs to meet the Dynamic Matching with transmitting antenna, can be less in formation resistivity, again can be in the higher situation of formation resistivity
Under realize effective power export.
Conventional transmitter power amplifier design is all to adopt transformation for the coupling of power amplifier and transmitting antenna
Device is realizing impedance matching.As load impedance dynamic range is too big, need multi-tap transformator to realize, implement quite
Difficult.More as signal frequency is in extremely low frequency, volume of transformer will meet frequency characteristic, and the volume that is bound to is big.Due to down-hole
Environment space is narrow and small, cannot be realized using the coupling method of transformator.
Therefore, the Adaptive matching power amplifier under the conditions of a kind of transless width dynamic load variations of design is to solve
The effective way of such problem.
For correlation technique intermediate power amplifier cannot self adaptation carry out the problem of power match, not yet propose at present effectively
Solution.
Content of the invention
The invention provides a kind of power amplifier and its implementation, transmitter and wireless drilling measuring system, so that
Solve the above problems less.
According to an aspect of the invention, there is provided a kind of implementation method of power amplifier, including：Described in real-time detection
The voltage amplitude and current amplitude of power amplifier output-stage simultaneously calculate output according to the voltage amplitude and current amplitude；
The comparison output and calibration power, and the feedback control voltage of the power amplifier is adjusted according to comparative result；Root
According to the supply voltage that the feedback control voltage adjusts the power amplifier output-stage, and then it is defeated to control the power amplifier
Go out the output of level.
Preferably, methods described also includes：The pulse signal of input is carried out processing and generates square-wave signal；According to the confession
Piezoelectric voltage adjusts the amplitude of the square-wave signal, and wherein, the amplitude of the square-wave signal is directly proportional to the supply voltage；Described
The output of power amplifier drives the square-wave signal to pass through transmitting antenna transmission of electromagnetic signals.
Preferably, the pulse signal of input is carried out process generation square-wave signal includes：Complementary to the two-way time being input into
Transistor-Transistor Logic level pulse signal be modulated, and by modulation after signal differential amplify produce bipolar square wave signal；The power
The amplification of amplifier promotes level to amplify the square-wave signal after modulating, and the square-wave signal after the amplification is loaded into the power
The output stage of amplifier.
Preferably, the comparison output and calibration power, and the power amplifier is adjusted according to comparative result
Feedback control voltage includes at least one of：Output magnitude of voltage, the comparison output are obtained according to the output
Power voltage value and calibration power magnitude of voltage corresponding with the calibration power, are more than the mark in the output magnitude of voltage
In the case of quasi- power voltage value, reduce feedback control voltage, otherwise, improve feedback control voltage；The comparison current amplitude
With maximum allowable operating current amplitude, in the case where the current amplitude is more than the maximum allowable operating current amplitude, drop
Low feedback control voltage.
Preferably, the square-wave signal is data modulated signal, and wherein, the modulating mode of the modulated signal is phase shift key
Control, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.
Preferably, the power amplifier is switch-mode amplifiers, and its output stage is operated on off state, is output as double
Polarity square wave signal, the amplitude of the square-wave signal are determined by the supply voltage of the output stage of the power amplifier.
According to a further aspect in the invention, there is provided a kind of power amplifier, including：Detection module, for real-time detection
The voltage amplitude and current amplitude of the power amplifier output-stage simultaneously calculate output according to the voltage amplitude and current amplitude
Power；Comparison module, for the comparison output and calibration power, and adjusts the power amplifier according to comparative result
Feedback control voltage；Adjusting module, for adjusting the confession of the power amplifier output-stage according to the feedback control voltage
Piezoelectric voltage, and then control the output of the power amplifier.
Preferably, also include：Amplify and promote level, bipolar square wave letter is generated for carrying out processing the pulse signal of input
Number, according to the amplitude that the supply voltage adjusts the square-wave signal, wherein, the amplitude of the square-wave signal and the power supply are electric
Direct ratio is pressed into, and the output using the power amplifier drives the square-wave signal to launch electromagnetism letter by transmitting antenna
Number.
Preferably, described amplification promotes level to be used for adjusting the Transistor-Transistor Logic level pulse signal of the two-way time complementation being input into
System, and by modulation after differential amplification of signal produce bipolar square wave signal, then amplify the square-wave signal after modulation, and by institute
State the output stage that the square-wave signal after amplifying is loaded into the power amplifier.
Preferably, the comparison module is used at least one of：Output voltage is obtained according to the output
Value, relatively the output magnitude of voltage and calibration power magnitude of voltage corresponding with the calibration power, in the output
Magnitude of voltage reduces feedback control voltage more than in the case of the calibration power magnitude of voltage, otherwise, improves feedback control voltage；
Relatively the current amplitude and maximum allowable operating current amplitude, are more than the maximum allowable operating current in the current amplitude
In the case of amplitude, reduce feedback control voltage.
According to a further aspect in the invention, there is provided a kind of transmitter, including any one of above-mentioned Section 7 to Section 10
Described power amplifier.
According to a further aspect in the invention, there is provided a kind of wireless drilling measuring system, including：Downhole system, for adopting
Collect and send downhole data；System on well, for receiving and processing the downhole data；Wherein, the downhole system includes
State the transmitter described in Section 11, for sending the downhole data to system on the well, the downhole data include with
At least one lower：Inclination angle, orientation, tool-face, temperature, natural gamma, pressure, electromagnetic resistivity.
By the present invention, the voltage amplitude and current amplitude of power amplifier output-stage described in real-time detection according to the electricity
Pressure amplitude degree and current amplitude calculate output；Compare output and calibration power, and power is adjusted according to comparative result and put
The feedback control voltage of big device；According to the supply voltage that feedback control voltage adjusts power amplifier output-stage, and then control work(
The output of rate amplifier output stage, solve the problems, such as power amplifier cannot self adaptation mated, and then reach
There is the effect of Adaptive matching.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the implementation method of Adaptive matching power amplifier according to embodiments of the present invention；
Fig. 2 is the structured flowchart of Adaptive matching power amplifier according to embodiments of the present invention；
Fig. 2 a are the structured flowcharts of wireless drilling measuring system according to embodiments of the present invention；
Fig. 3 is the structured flowchart of Adaptive matching power amplifier according to the preferred embodiment of the invention；
Fig. 3 a are the circuit diagrams for amplifying and promoting level according to the preferred embodiment of the invention；
Fig. 3 b are the circuit diagrams of complementary push-pull output stage according to the preferred embodiment of the invention；
Fig. 3 c are the circuit diagrams of power calculation circuit according to the preferred embodiment of the invention.
Specific embodiment
Below with reference to accompanying drawing and in conjunction with the embodiments describing the present invention in detail.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
Embodiment one
A kind of implementation method of Adaptive matching power amplifier is embodiments provided, Fig. 1 is according to the present invention
The flow chart of the implementation method of the Adaptive matching power amplifier of embodiment, as shown in figure 1, the flow process is comprised the following steps：
Step S102, the voltage amplitude and current amplitude of real-time detection power amplifier output-stage according to the voltage amplitude
Output is calculated with current amplitude；
Step S104, compares output and calibration power, and adjusts the feedback control of power amplifier according to comparative result
Voltage processed；
Step S106, according to the supply voltage that the feedback control voltage adjusts power amplifier output-stage, and then controls to be somebody's turn to do
The output of power amplifier output-stage.
By above-mentioned steps, change transmitter power amplifier in correlation technique and be designed with transformator to realize hindering
The way of anti-coupling, and then achieve under the conditions of wide dynamic load variations, realize the dynamic of power amplifier and transmitting antenna
Coupling.
After the output for controlling the power amplifier output-stage, the method also includes：Pulse letter by input
Number carry out processing and generate square-wave signal；According to the amplitude that supply voltage adjusts the square-wave signal, wherein, the amplitude of the square-wave signal
It is directly proportional to supply voltage；The output of power amplifier drives the square-wave signal to pass through transmitting antenna transmission of electromagnetic signals.
By above-mentioned steps, ensure that transmitter exports effective power by antenna under Different Strata resistivity conditions, and then ensured
On well, system is able to detect that signal.
The mode that the pulse signal of input carries out processing generation square-wave signal there are many kinds, it is preferable that two to input
Road time complementary Transistor-Transistor Logic level pulse signal is modulated, and by modulation after differential amplification of signal produce bipolar square wave letter
Number, power amplifier amplification promote level amplify modulation after square-wave signal, and by amplification after square-wave signal be loaded into power
The output stage of amplifier.Bipolar square wave signal is formed after the signal processing that will be input into by above-mentioned steps, airborne as launching
Wave train, output square wave amplitude are directly directly proportional to power amplifier output-stage supply voltage, and then can pass through controlled output
Level supply voltage can reach the purpose of controlled output power.
Relatively output and calibration power, and the feedback control voltage for adjusting power amplifier according to comparative result can be with
Including various ways, it is preferable that at least one of can be included：Output magnitude of voltage is obtained according to output, is compared
The output magnitude of voltage and calibration power magnitude of voltage corresponding with the calibration power, are more than standard work(in output magnitude of voltage
In the case of rate magnitude of voltage, reduce feedback control voltage, otherwise, improve feedback control voltage；Relatively current amplitude and maximum permit
Perhaps operating current amplitude, in the case where current amplitude is more than maximum allowable operating current amplitude, reduces feedback control voltage.
The modulation system of square-wave signal has multiple, it is preferable that square-wave signal occurs with square, is data modulation letter
Number, wherein, the modulating mode of modulated signal is phase-shift keying, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.By above-mentioned
Step, can generate the more preferable square-wave signal of modulation effect.
Power amplifier has many kinds, it is preferable that can be switch-mode amplifiers, and its output stage is operated in switch shape
State, is output as bipolar square wave signal.By above-mentioned steps, correlation technique intermediate power amplifier is changed using sinusoidal signal
Way, and switch-mode amplifiers are employed, bipolar square wave is exported, and then be can reach by controlled output level supply voltage
The purpose of controlled output power.
Embodiment two
A kind of Adaptive matching power amplifier is embodiments provided, Fig. 2 is oneself according to embodiments of the present invention
Adapt to the structured flowchart of mesh power amplifier, as shown in Fig. 2 the power amplifier includes：Detection module 10, comparison module
20th, adjusting module 30.
Detection module 10 is used for the voltage amplitude and current amplitude of real-time detection power amplifier output-stage and according to voltage
Amplitude and current amplitude calculate output；
Comparison module 20 is used for comparing output and calibration power, and adjusts the anti-of power amplifier according to comparative result
Feedback control voltage；
Adjusting module 30 is used for the supply voltage for adjusting power amplifier output-stage according to feedback control voltage, and then controls
The output of power amplifier.
Preferably, also include amplifying and promote level 40, square-wave signal, root is generated for carrying out processing the pulse signal of input
According to the amplitude that supply voltage adjusts square-wave signal, wherein, the amplitude of square-wave signal is directly proportional to supply voltage, and is put using power
The output of big device drives square-wave signal to pass through transmitting antenna transmission of electromagnetic signals.
Preferably, amplify and promote level 40 to be used for being modulated the Transistor-Transistor Logic level pulse signal of the two-way time complementation being input into,
And by modulation after signal differential amplify produce bipolar square wave signal, then amplify modulation after square-wave signal, and will amplify
Square-wave signal afterwards is loaded into the output stage of power amplifier.
Preferably, comparison module 20 is used at least one of：Output magnitude of voltage is obtained according to output, is compared
Output magnitude of voltage and calibration power magnitude of voltage corresponding with calibration power, in output magnitude of voltage more than calibration power electricity
In the case of pressure value, reduce feedback control voltage, otherwise, improve feedback control voltage；Compare current amplitude and maximum allowable work
Make current amplitude, in the case where current amplitude is more than maximum allowable operating current amplitude, reduce feedback control voltage.
Embodiment three
A kind of transmitter is embodiments provided, the transmitter includes the power amplifier in embodiment two.
Power amplifier adopted sinusoidal signal, coupling realize using transformer coupled that transformator is in load in the past
When dynamic range is larger, power to be realized steadily exports extremely difficult.The present embodiment intermediate power amplifier adopts switching molding
Formula amplifier, output stage are operated on off state, are output as bipolar square wave sequence, and output square wave amplitude is directly supplied with output stage
Piezoelectric voltage is directly proportional.Therefore the purpose of controlled output power is can reach by controlled output level supply voltage.Specifically, lead to
Overpower negative-feedback technology, adjusts the output stage supply voltage of control power amplifier, by realizing output and power supply
The dynamic equilibrium of voltage come realize transmitter with load mate.
The present embodiment solves electromagnetic measurement while drilling adverse circumstances and goes into the well lower transmitter power amplifier and transmitting antenna
Adaptive matching problem.Under the conditions of wide dynamic load variations, the Dynamic Matching of power amplifier and transmitting antenna is realized.
Example IV
Embodiments provide a kind of wireless drilling measuring system, Fig. 2 a be according to embodiments of the present invention wireless with
The structured flowchart of measuring system is bored, as shown in Figure 2 a, the system includes system 2a04 on downhole system 2a02 and well.
Downhole system 2a02, for gathering and sending downhole data；
System 2a04 on well, for receiving and processing the downhole data；
Wherein, downhole system includes the transmitter in embodiment three, for sending downhole data, the down-hole to system on well
Data can include at least one of：Inclination angle, orientation, tool-face, temperature, natural gamma, pressure, electromagnetic resistivity.
Under the technical guarantee Different Strata resistivity conditions, transmitter exports effective power by antenna, so as to ensure on well
System is able to detect that signal.
Embodiment five
Fig. 3 is the structured flowchart of Adaptive matching power amplifier according to the preferred embodiment of the invention, as shown in figure 3,
The power amplifier includes amplifying promotion level 40, complementary push-pull output stage 50, voltage and current detection circuit 60, power calculation circuit
70th, power negative feedback control circuit 80, adjustment power module 90, wherein, voltage and current detection circuit 60 equivalent to Fig. 2 in inspection
Survey module, power calculation circuit 70 and power negative feedback control circuit 80 equivalent to Fig. 2 in comparison module 20, adjust power supply mould
Block 90 and complementary push-pull output stage 50 equivalent to Fig. 2 in adjusting module 30.
Power amplifier in the present embodiment adopts switching mode complementary push-pull amplifier, output stage to be operated in saturation conduction
State.The real-time measurement output voltage of voltage and current detection circuit 60 and electric current, power calculation circuit 70 are calculated and output.Work(
Rate negative feedback control circuit 80 compares output and calibration power value（Differential amplification）, when output is differed with calibration power
When, the supply voltage that power module 90 adjusts output level power supply by power negative feedback is adjusted, when output is more than standard work(
During rate, reduce supply voltage；Contrary then increase supply voltage, reaches the dynamic equilibrium of output according to this.
Each ingredient of power amplifier is described more fully below：Amplify promote level 40, complementary push-pull output stage 50,
Voltage and current detection circuit 60, power calculation circuit 70, power negative feedback control circuit 80, adjustment power module 90.
（One）Amplify and promote level 40
Fig. 3 a are the circuit diagrams for amplifying and promoting level according to the preferred embodiment of the invention, and as shown in Figure 3 a, A1, B1 are two defeated
Enter end, connect one end of first resistor 402 and second resistance 404, the other end of first resistor 402 and the 3rd electricity in parallel respectively
Resistance 406 is connected with the junction point of difference amplifier 408, the other end of second resistance 404 and the 4th resistance 410 in parallel and difference
The junction point of amplifier 408 is connected, the other end ground connection of the 4th resistance 410.The outfan of difference amplifier 408 and the first electric capacity
412 one end is connected, and the other end of the first electric capacity 412 is connected with an input of follower 414, the output of follower 414
Output voltage is fed back to another input of follower 414 at end.C1 is the outfan of follower 414.Follower 414 is also distinguished
It is grounded by the second electric capacity 416 and the 3rd electric capacity 418.
During work, the two-way Transistor-Transistor Logic level pulse train of A1, B1 two ends input time complementation is through 408 difference of difference amplifier
Bipolar square wave signal is formed after amplification.The bipolar square wave signal can be as transmitter carrier sequence, by changing pulse
Width can accordingly change carrier frequency, realize that phase keying produces modulated signal, the modulation by controlling the change of carrier phase
Signal through power amplifier drive, from transmitting antenna to stratum send electromagnetic signal, surface well reception antenna receive, filtering,
Amplify, demodulating and decoding carries out data recovery.Follower 414 is mainly as promotion level.
（Two）Complementary push-pull output stage 50
Fig. 3 b are the circuit diagrams of complementary push-pull output stage according to the preferred embodiment of the invention, and as shown in Figure 3 b, S is input
End, is connected with the outfan C1 shown in Fig. 3 a.The other end of input S and the 5th resistance 502 in parallel and 504 phase of the 6th resistance
Even.The other end of the 5th resistance 502 is connected with the first power amplifier tube 506, an outfan of the first power amplifier tube 506 with
Positive source is connected, and the first power amplifier tube 506 is connected with one end of the 4th electric capacity 516 with the junction point of positive source, and the 4th
The other end ground connection of electric capacity 516, another outfan is connected with one end of the 7th resistance 508, the 7th resistance 508 and the first power
The junction point of amplifier tube 506 constitutes an output terminals A of complementary push-pull output stage.The other end of the 7th resistance 508 and the 8th electricity
Resistance 510 is connected, and the junction point of the two is another outfan B of complementary push-pull output stage, and outfan B is connected with the 7th resistance 508
One end be also connected with one end of the 9th resistance 518, the other end of the 9th resistance 518 ground connection.The other end of the 6th resistance 504 with
The input of the second power tube 512 is connected, an output termination power cathode of the second power tube 512, the second power tube 512 with
The junction point of power cathode is connected with one end of the 5th electric capacity 514, the other end ground connection of the 5th electric capacity 514, another outfan
It is connected with the other end of the 8th resistance 510.The junction point of the second power tube 512 and the 8th resistance 510 is complementary push-pull output
Another outfan C of level.
In the present embodiment, complementary push-pull output stage is complementary push-pull switch-mode amplifiers, amplifies and promotes level to pass through outfan
The promotion output signal of C1 outputs is input into the input S of complementary push-pull output stage, through the first power tube 506（N-channel）, the second work(
Rate pipe 512（P-channel）After amplification, it is loaded on nine resistance 518 of load regulation.First power tube 506 and the second power tube 512 are adopted
Managed with Vmos, under the conditions of saturation conduction, conducting resistance is very little for selected Vmos pipes, only several milliohms.7th resistance 508,
8th resistance 510 is sample resistance, and the 9th resistance 518 is equivalent load resistance.It is assumed that complementary push-pull output stage power supply is
Generating positive and negative voltage V+, V-, the 7th resistance 508 is R3, the 8th resistance 510 is R4, the 9th resistance 518 is RL.
Set：
V+=|V-|=U (1)
R3=R4=R (2)
As Vmos pipe conducting resistances are minimum, therefore its power consumption can be ignored.Power amplifier output amplitude power is：
Po≈U2*RL/（R+RL）2 (3)
As load RL》During R
Po≈U2/RL(4)
In practice, sample resistance is as far as possible little, generally much smaller than load resistance, can so reduce idle power consumption.
（Three）Voltage and current detection circuit 60
Voltage and current detection circuit 60 is used for the voltage and current amplitude for detecting power amplifier output, it is assumed that by measurement
Sample resistance both end voltage amplitude VR（R3Or R4）, therefore, output current is：
Io=VR/R (5)
By to RLTwo end signals carry out the voltage Uo that linear detection is obtained load end, are increased by adjusting measuring circuit
Benefit causes Io and Uo accurate.
（Four）Power calculation circuit 70
Fig. 3 c are the circuit diagram of power calculation circuit according to the preferred embodiment of the invention, as shown in Figure 3 c, power calculation
Circuit mainly includes multiplier 702, the 6th electric capacity 704, the 7th electric capacity 706.
Multiplier 702 can adopt AD734 multipliers.AD734 multipliers have 14 pins, it is assumed that first and second pin
It is X1, X2 respectively, the three to five pin is U0, U1, U2 respectively, and the six, the seven pins are Y1, Y2 respectively, and the 8th pin is VN, the
Nine pins are ER, and the ten, the 11 pins are Z1, Z2 respectively, and the 12nd pin is W, and the 13rd pin is DD, and the 14th pin is
VP.Wherein, X1, Y1 are respectively connected to voltage and current, and X2, Y2, Z2, U0, U1, U2 are grounded respectively.8th pin is powered for -15V,
7th electric capacity 706 is connected with the 8th pin as power filtering capacitor, one end, and the other end is grounded.14th foot is powered for+15V,
6th electric capacity 704 is connected with the 14th pin as power filtering capacitor, one end, and the other end is grounded.Tenth pin is grounded.Tenth
First, 12 pins are connected, and export normalized power magnitude of voltage
Such as, voltage Uo, Io introduces X1, Y1 respectively, and X2, Y2, Z2 are grounded, and exports normalized power：PW=UoIo/10,
If setting power is 10W, normalized power magnitude of voltage is 1V.
（Five）Power negative feedback control circuit 80
Power negative feedback control circuit 80 compares preset standard power voltage value and measures power voltage value in real time（Differential put
Greatly）, when comparative result Δ P ＞ 0 are that actual power is more than calibration power, reduce feedback control voltage VC；Contrary then rising is instead
Feedback control voltage VC.While circuit configuration maximum operating currenbt IM, in the same manner, when calibration power current value and real-time measurement power
During the difference △ I ＞ 0 of current value, reduce feedback control voltage VC, setting limit value is less than so as to reach control operating current
Effect.Under normal circumstances, only when load resistance is minimum or short-circuit condition under current control play overcurrent protection.
（Six）Adjustment power module 90
Adjustment power module 90 is that electronics adjusts power supply, is that power amplifier output-stage is powered, and its control end is from work(
Control voltage V of the output of rate negative feedback control circuit 80C.Its output voltage V+/V- is controlled by VCTerminal voltage, its maximum open circuit
Voltage ± UM.Change VCTerminal voltage can control to adjust the 0～± U of output of power module 90M.Control voltage VCControl adjustment power supply
90 output size of module, so that change output.
Power negative-feedback circuit 80 is compared with the maximum current value of preset standard power according to measured power and electric current, when big
When the maximum current value of calibration power or when operating current is more than maximum allowable operating current, feedback control voltage VCReduce from
And output stage supply voltage accordingly reduces；On the contrary when less than calibration power value, feedback control voltage VCIncrease is so as to output stage
Supply voltage increases, it is achieved that power output dynamic equilibrium, that is, achieve the Dynamic Matching of power amplifier and load.
Dynamic Matching characteristic depends on adjustment 90 maximum output voltage value size of power module, as load RL=0.1 Ω～
During 6.4 Ω, rated output power P is sete=10W, then maximum output voltage at least ± 8V, could meet the dynamic in whole interval
Coupling（10W is constant）；Work as RLDuring=0.1 Ω～50 Ω, then maximum open circuit voltage is at least ± 22.4V.
It is established standardses watt level that the present embodiment allows to change rated power, meets different depth transmission demand.Down-hole
Power under drilling state mostly using battery-powered, when not needing high-power, selection small-power can be set as needed
Pattern, saves battery power consumption, extends the down-hole battery working time.
As can be seen from the above description, present invention achieves following technique effect：Nothing under the conditions of dynamic load variations
Transformer self-adaptive mates switch-mode power amplifier, and dependable performance, efficiency are higher, is met by rational seal approach and is bored
Enter reliable and stable work under the conditions of vibration, impact, high temperature, high pressure etc. in state, meanwhile, rational overcurrent protection measure causes defeated
Going out will not power amplifier damage under short-circuit condition.Power amplifier output-stage is operated in switching mode, and selected pipe saturation is led
The resistance that is powered is minimum, is substantially at without febrile state, or even under tens A current conditions, and Vmos power tubes are all without burning out.Do not have simultaneously
There are transformator, transmitter volume to be substantially reduced, used in adapting to measurement while drilling.In addition, switch-mode amplifiers are operated in out
Off status, during especially with Vmos pipes, saturation conduction resistance is minimum, typically in several milliohms.Therefore, power tube dissipated power
Can ignore, efficiency is very high, even if will not also produce excessive heat in high current work, reliability is also high.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned present invention can be with general
Computing device realizing, they can be concentrated on single computing device, or are distributed in multiple computing devices and are constituted
Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to they are stored
Executed by computing device in the storage device, and in some cases, can be executed with the order being different from herein shown
The step of going out or describe, or they are fabricated to each integrated circuit modules respectively, or by the multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of implementation method of power amplifier, it is characterised in that include：
The voltage amplitude and current amplitude of power amplifier output-stage described in real-time detection according to the voltage amplitude and electric current
Amplitude calculates output；
The comparison output and calibration power, and the feedback control electricity of the power amplifier is adjusted according to comparative result
Pressure；
According to the supply voltage that the feedback control voltage adjusts the power amplifier output-stage, and then the control power is put
The output of big device output stage；
Wherein, methods described also includes：The pulse signal of input is carried out processing and generates square-wave signal；According to the supply voltage
The amplitude of the square-wave signal is adjusted, wherein, the amplitude of the square-wave signal is directly proportional to the supply voltage；The power is put
The output of big device drives the square-wave signal to pass through transmitting antenna transmission of electromagnetic signals.
2. implementation method according to claim 1, it is characterised in that the pulse signal of input is carried out processing and generates square wave
Signal includes：
The Transistor-Transistor Logic level pulse signal complementary to the two-way time for being input to amplifier stage carries out data modulation, and by modulation after letter
Number differential amplification produces bipolar square wave signal；
The amplification of the power amplifier promotes level to amplify the square-wave signal after modulating, and the square-wave signal after the amplification is driven
Move the output stage of the power amplifier.
3. implementation method according to claim 2, it is characterised in that the comparison output and calibration power, and root
The feedback control voltage that the power amplifier is adjusted according to comparative result includes at least one of：
Output magnitude of voltage is obtained according to the output, the comparison output magnitude of voltage and with the calibration power
Corresponding calibration power magnitude of voltage, in the case where the output magnitude of voltage is more than the calibration power magnitude of voltage, reduces
Feedback control voltage, otherwise, improves feedback control voltage；
Relatively the current amplitude and maximum allowable operating current amplitude, are more than the maximum allowable work in the current amplitude
In the case of current amplitude, reduce feedback control voltage.
4. implementation method according to any one of claim 1 to 3, it is characterised in that the square-wave signal is that data are adjusted
Signal processed, wherein, the modulating mode of the modulated signal is phase-shift keying, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.
5. implementation method according to any one of claim 1 to 3, it is characterised in that the power amplifier is switch
Pattern amplifiers, its output stage are operated on off state, are output as bipolar square wave signal, and the amplitude of the square-wave signal is by institute
The supply voltage for stating the output stage of power amplifier determines.
6. a kind of power amplifier, it is characterised in that include：
Detection module, voltage amplitude and current amplitude for power amplifier output-stage described in real-time detection according to the electricity
Pressure amplitude degree and current amplitude calculate output；
Comparison module, for the comparison output and calibration power, and adjusts the power amplifier according to comparative result
Feedback control voltage；
Adjusting module, for adjusting the supply voltage of the power amplifier output-stage according to the feedback control voltage, and then
Control the output of the power amplifier；
Wherein, the power amplifier also includes：Amplify and promote level, bipolar for the pulse signal of input is carried out process generation
Property square-wave signal, according to the amplitude that the supply voltage adjusts the square-wave signal, wherein, the amplitude of the square-wave signal and institute
State supply voltage to be directly proportional, and the output using the power amplifier drives the square-wave signal to send out by transmitting antenna
Radio magnetic signal.
7. power amplifier according to claim 6, it is characterised in that the amplification promotes level to be used for the two-way to being input into
Time complementary Transistor-Transistor Logic level pulse signal is modulated, and by modulation after differential amplification of signal produce bipolar square wave signal,
Then amplify the square-wave signal after modulation, and the square-wave signal after the amplification is loaded into the output of the power amplifier
Level.
8. the power amplifier according to claim 6 or 7, it is characterised in that the comparison module be used for following at least it
One：
Output magnitude of voltage is obtained according to the output, the comparison output magnitude of voltage and with the calibration power
Corresponding calibration power magnitude of voltage, in the case where the output magnitude of voltage is more than the calibration power magnitude of voltage, reduces
Feedback control voltage, otherwise, improves feedback control voltage；
Relatively the current amplitude and maximum allowable operating current amplitude, are more than the maximum allowable work in the current amplitude
In the case of current amplitude, reduce feedback control voltage.
9. a kind of transmitter, it is characterised in that including the power amplifier any one of the claims 6 to 8, be used for
With transmitting antenna Dynamic Matching.
10. a kind of wireless drilling measuring system, it is characterised in that include：
Downhole system, for gathering and sending downhole data；
System on well, for receiving and processing the downhole data；
Wherein, the downhole system includes the transmitter described in claim 9, for sending the down-hole to system on the well
Data, the downhole data include at least one of：Inclination angle, orientation, tool-face, temperature, natural gamma, pressure, electromagnetic wave
Resistivity.
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| CN201210533273.3A CN103117717B (en) | 2012-12-11 | 2012-12-11 | Power amplifier and its implementation, transmitter and wireless drilling measuring system |
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| CN201210533273.3A CN103117717B (en) | 2012-12-11 | 2012-12-11 | Power amplifier and its implementation, transmitter and wireless drilling measuring system |
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| CN103117717B true CN103117717B (en) | 2017-03-15 |
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| CN104698333A (en) * | 2015-03-23 | 2015-06-10 | 广州播博科技有限公司 | Method and device for detecting and handling load faults of power amplifier |
| CN107132548B (en) * | 2017-06-22 | 2023-07-25 | 中国人民解放军第六九O五工厂 | Amplifying circuit for Beidou search and rescue device |
| CN109424358B (en) * | 2017-08-24 | 2021-08-24 | 中国石油化工股份有限公司 | High-power resistivity signal transmitting device while drilling |
| CN110792433B (en) * | 2018-07-16 | 2023-03-10 | 中国石油化工股份有限公司 | Signal transmitting device for measurement while drilling system and cross-screw data transmission method |
| CN110855250B (en) * | 2019-11-29 | 2023-04-18 | 哈尔滨工业大学 | Linear power amplifier driving method with variable power supply voltage |
| CN111456724B (en) * | 2020-03-27 | 2021-11-19 | 华中科技大学 | Automatic tuning type underground wireless signal transmission system |
| CN113863921A (en) * | 2021-09-24 | 2021-12-31 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Near-bit wireless short transmission driving circuit and power self-adjusting method thereof |
| CN114737961B (en) * | 2022-04-15 | 2023-02-28 | 中国科学院地质与地球物理研究所 | Device and method for measuring orientation electromagnetic wave resistivity while drilling |
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