CN203219249U - Power amplifier, transmitter and wireless measurement while drilling system - Google Patents
Power amplifier, transmitter and wireless measurement while drilling system Download PDFInfo
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- CN203219249U CN203219249U CN 201220682622 CN201220682622U CN203219249U CN 203219249 U CN203219249 U CN 203219249U CN 201220682622 CN201220682622 CN 201220682622 CN 201220682622 U CN201220682622 U CN 201220682622U CN 203219249 U CN203219249 U CN 203219249U
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Abstract
The utility model provides a power amplifier, a transmitter and a wireless measurement while drilling system. The power amplifier comprises a detection module used for detecting the voltage amplitude and the current amplitude of an output stage of the power amplifier in real time and calculating output power according to the voltage amplitude and the current amplitude; a comparison module used for comparing the output power with standard power and adjusting feedback control voltage of the power amplifier according to a compared result; and an adjustment module used for adjusting supply voltage of the output stage of the power amplifier according to the feedback control voltage and further controlling the output voltage of the power amplifier. By using the power amplifier, the problem that a power amplifier can not self-adaptively conduct matching is solved, and thus the beneficial effect of self-adaptive matching of the power amplifier is achieved.
Description
Technical field
The utility model relates to dynamo-electric field, in particular to a kind of power amplifier, transmitter and wireless drilling measuring system.
Background technology
In development of resources such as oil, the mine drilling process, a large amount of information is along with creeping into real-time Transmission to ground, and electromagnetic transmission is a kind of effective transmission means.The underground signal emitter comprises: transmitting antenna (Asymmetric Electric dipole) and transmitter.Because formation resistivity changes with the variation of the degree of depth, and the transmitting antenna equiva lent impedance changes with formation resistivity is different, and when formation resistivity during at 1 Ω m～1000 Ω m, the antenna equiva lent impedance is approximately 0.1 Ω～50 Ω.Simultaneously, because the stratum is lossy dielectric, electromagnetic wave is very big in the stratum transmission attenuation, adapts to the wave frequency scope of stratum transmission: 0～30Hz.Emitter is installed in the down-hole equipment in the drilling process, and the space is narrow and small, and work under bad environment should be born anti-vibration, shock resistance in the drilling process, and the more high-power ground receiving wastewater facility that is beneficial to of output receives signal again.Therefore, the design of transmitter power amplifier need be satisfied the dynamic coupling with transmitting antenna, can be less in formation resistivity, can under the higher situation of formation resistivity, realize effective power output again.
Transmitter power amplifier design in the past all is to adopt transformer to realize impedance matching for the coupling of power amplifier and transmitting antenna.Because the load impedance dynamic range is too big, need many tapped transformers to realize, implement quite difficulty.More because signal frequency is in extremely low frequency, and volume of transformer will satisfy frequency characteristic, certainly will want big by volume.Because the subsurface environment space is narrow and small, adopt the coupling way of transformer to realize.
Therefore, the Adaptive matching power amplifier that designs under the wide dynamic load variations condition of a kind of transless is the effective way that solves such problem.
Can't self adaptation carry out the problem of power match at the correlation technique intermediate power amplifier, do not propose effective solution at present as yet.
The utility model content
The utility model provides a kind of power amplifier, transmitter and wireless drilling measuring system, to address the above problem at least.
According to an aspect of the present utility model, a kind of power amplifier is provided, comprising: detection module is used for detecting in real time the voltage amplitude of described power amplifier output-stage and current amplitude and calculates power output according to described voltage amplitude and current amplitude; Comparison module is used for more described power output and calibration power, and adjusts the FEEDBACK CONTROL voltage of described power amplifier according to comparative result; Adjusting module is used for adjusting the supply power voltage of described power amplifier output-stage according to described FEEDBACK CONTROL voltage, and then controls the power output of described power amplifier.
Preferably, also comprise: amplify the promotion level, be used for the pulse signal of input is handled generation bipolar square wave signal, adjust the amplitude of described square-wave signal according to described supply power voltage, wherein, the amplitude of described square-wave signal is directly proportional with described supply power voltage, and utilizes the power output of described power amplifier to drive described square-wave signal by the transmission antennas transmit electromagnetic signal.
Preferably, described amplification promotion level is used for the Transistor-Transistor Logic level pulse signal of the two-way time complementation of input is modulated, and the differential amplification of the signal after will modulating produces the bipolar square wave signal, amplify the square-wave signal after modulating then, and the square-wave signal after the described amplification is loaded into the output stage of described power amplifier.
Preferably, described comparison module be used for following one of at least: obtain the power output magnitude of voltage according to described power output, more described power output magnitude of voltage and with the corresponding calibration power magnitude of voltage of described calibration power, under the situation of described power output magnitude of voltage greater than described calibration power magnitude of voltage, reduce FEEDBACK CONTROL voltage, otherwise, improve FEEDBACK CONTROL voltage; More described current amplitude and the maximum operating current amplitude that allows under the situation of described current amplitude greater than described maximum permission operating current amplitude, reduce FEEDBACK CONTROL voltage.
Preferably, described square-wave signal is data modulated signal, and wherein, the modulating mode of described modulation signal is phase-shift keying, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.
Preferably, described power amplifier is the switching mode amplifier, and its output stage is operated on off state, is output as the bipolar square wave signal, and the amplitude of described square-wave signal is determined by the supply power voltage of the output stage of described power amplifier.
According on the other hand of the present utility model, a kind of transmitter is provided, comprise each described power amplifier in above-mentioned first to the 6th, be used for dynamically mating with transmitting antenna.
According on the other hand of the present utility model, a kind of wireless drilling measuring system is provided, comprising: downhole system is used for gathering and sending downhole data; Aboveground system is used for receiving and handling described downhole data; Wherein, described downhole system comprises above-mentioned the 8th described transmitter, is used for sending described downhole data to described aboveground system.
Preferably, described downhole data comprise following one of at least: inclination angle, orientation, tool-face, temperature, natural gamma, pressure, electromagnetic resistivity.
By the utility model, adopt detection module, be used for detecting in real time the voltage amplitude of described power amplifier output-stage and current amplitude and calculate power output according to described voltage amplitude and current amplitude; Comparison module is used for more described power output and calibration power, and adjusts the FEEDBACK CONTROL voltage of described power amplifier according to comparative result; Adjusting module is used for adjusting the supply power voltage of described power amplifier output-stage according to described FEEDBACK CONTROL voltage, and then controls the power output of described power amplifier.Solve the problem that power amplifier can't self adaptation mates, and then reached the effect with Adaptive matching.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the flow chart according to the implementation method of the Adaptive matching power amplifier of the utility model embodiment;
Fig. 2 is the structured flowchart according to the Adaptive matching power amplifier of the utility model embodiment;
Fig. 2 a is the structured flowchart according to the wireless drilling measuring system of the utility model embodiment;
Fig. 3 is the structured flowchart according to the Adaptive matching power amplifier of the utility model preferred embodiment;
Fig. 3 a is the circuit diagram that promotes level according to the amplification of the utility model preferred embodiment;
Fig. 3 b is the circuit diagram according to the complementary push-pull output stage of the utility model preferred embodiment;
Fig. 3 c is the circuit diagram according to the power calculation circuit of the utility model preferred embodiment.
Embodiment
Hereinafter will describe the utility model with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Embodiment one
The utility model embodiment provides a kind of implementation method of Adaptive matching power amplifier, and Fig. 1 is the flow chart according to the implementation method of the Adaptive matching power amplifier of the utility model embodiment, and as shown in Figure 1, this flow process may further comprise the steps:
Step S102, the in real time voltage amplitude of detection power amplifier output stage and current amplitude and calculate power output according to this voltage amplitude and current amplitude;
Step S104 compares power output and calibration power, and adjusts the FEEDBACK CONTROL voltage of power amplifier according to comparative result;
Step S106 adjusts the supply power voltage of power amplifier output-stage according to this FEEDBACK CONTROL voltage, and then controls the power output of this power amplifier output-stage.
By above-mentioned steps, the design that has changed transmitter power amplifier in the correlation technique adopts transformer to realize the way of impedance matching, and then has realized under wide dynamic load variations condition, realizes the dynamic coupling of power amplifier and transmitting antenna.
After the power output of the described power amplifier output-stage of control, this method also comprises: the pulse signal of input is handled the generation square-wave signal; Adjust the amplitude of this square-wave signal according to supply power voltage, wherein, the amplitude of this square-wave signal is directly proportional with supply power voltage; The power output of power amplifier drives this square-wave signal by the transmission antennas transmit electromagnetic signal.By above-mentioned steps, ensured that transmitter is exported effective power by antenna under the Different Strata resistivity conditions, and then ensured that aboveground system can detect signal.
The pulse signal of input is handled the mode that generates square-wave signal to be had a variety of, preferably, the Transistor-Transistor Logic level pulse signal of two-way time complementation to input is modulated, and the differential amplification of the signal after will modulating produces the bipolar square wave signal, the amplification of power amplifier promotes the square-wave signal after level is amplified modulation, and the square-wave signal after will amplifying is loaded into the output stage of power amplifier.By above-mentioned steps the signal of input is handled the back and form the bipolar square wave signal, as the transmitter carrier sequence, the output square wave amplitude directly is directly proportional with the power amplifier output-stage supply power voltage, and then can reach the purpose of control power output by control output stage supply power voltage.
Compare power output and calibration power, and can comprise multiple mode according to the FEEDBACK CONTROL voltage that comparative result is adjusted power amplifier, preferably, can comprise following one of at least: obtain the power output magnitude of voltage according to power output, relatively this power output magnitude of voltage and with the corresponding calibration power magnitude of voltage of this calibration power, under the situation of power output magnitude of voltage overgauge power voltage value, reduce FEEDBACK CONTROL voltage, otherwise, improve FEEDBACK CONTROL voltage; Relatively current amplitude and the maximum operating current amplitude that allows allow greater than maximum to reduce FEEDBACK CONTROL voltage under the situation of operating current amplitude at current amplitude.
The modulation system of square-wave signal has multiple, and preferably, square-wave signal occurs with the square wave form, is data modulated signal, and wherein, the modulating mode of modulation signal is phase-shift keying, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.By above-mentioned steps, can generate the better square-wave signal of modulation effect.
Power amplifier has a variety of, preferably, can be the switching mode amplifier, and its output stage is operated on off state, is output as the bipolar square wave signal.By above-mentioned steps, change the correlation technique intermediate power amplifier and adopted the way of sinusoidal signal, and adopted the switching mode amplifier, the output bipolar square wave, and then by controlling the purpose that the output stage supply power voltage can reach the control power output.
Embodiment two
The utility model embodiment provides a kind of Adaptive matching power amplifier, Fig. 2 is the structured flowchart according to the Adaptive matching power amplifier of the utility model embodiment, as shown in Figure 2, this power amplifier comprises: detection module 10, comparison module 20, adjusting module 30.
Adjusting module 30 is used for adjusting according to FEEDBACK CONTROL voltage the supply power voltage of power amplifier output-stage, and then the power output of control power amplifier.
Preferably, also comprise amplifying and promote level 40, be used for the pulse signal of input is handled the generation square-wave signal, adjust the amplitude of square-wave signal according to supply power voltage, wherein, the amplitude of square-wave signal is directly proportional with supply power voltage, and utilizes the power output of power amplifier to drive square-wave signal by the transmission antennas transmit electromagnetic signal.
Preferably, amplification promotion level 40 is used for the Transistor-Transistor Logic level pulse signal of the two-way time complementation of input is modulated, and the differential amplification of the signal after will modulating produces the bipolar square wave signal, amplify the square-wave signal after modulating then, and the square-wave signal after will amplifying is loaded into the output stage of power amplifier.
Preferably, comparison module 20 be used for following one of at least: obtain the power output magnitude of voltage according to power output, relatively the power output magnitude of voltage and with the corresponding calibration power magnitude of voltage of calibration power, under the situation of power output magnitude of voltage overgauge power voltage value, reduce FEEDBACK CONTROL voltage, otherwise, improve FEEDBACK CONTROL voltage; Relatively current amplitude and the maximum operating current amplitude that allows allow greater than maximum to reduce FEEDBACK CONTROL voltage under the situation of operating current amplitude at current amplitude.
Preferably, square-wave signal is data modulated signal, and wherein, the modulating mode of modulation signal is phase-shift keying, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.
Preferably, power amplifier is the switching mode amplifier, and its output stage is operated on off state, is output as the bipolar square wave signal, and the amplitude of this square-wave signal is determined by the supply power voltage of the output stage of power amplifier.
Embodiment three
The utility model embodiment provides a kind of transmitter, and this transmitter comprises the power amplifier among the embodiment two.
Power amplifier adopted sinusoidal signal in the past, and coupling can only adopt transformer coupled the realization, and transformer is when load dynamic change scope is big, and steadily output is very difficult to realize power.The present embodiment intermediate power amplifier adopts the switching mode amplifier, and output stage is operated on off state, is output as the bipolar square wave sequence, and the output square wave amplitude directly is directly proportional with the output stage supply power voltage.Therefore can reach the purpose of control power output by control output stage supply power voltage.Specifically, by the power negative-feedback technology, adjust the output stage supply power voltage of control power amplifier, realize the coupling of transmitter and load by the dynamic equilibrium that realizes power output and supply power voltage.
Present embodiment has solved electromagnetic wave while-drilling and has measured go into the well the down Adaptive matching problem of transmitter power amplifier and transmitting antenna of adverse circumstances.Under wide dynamic load variations condition, realize the dynamic coupling of power amplifier and transmitting antenna.
Embodiment four
The utility model embodiment provides a kind of wireless drilling measuring system, and Fig. 2 a is the structured flowchart according to the wireless drilling measuring system of the utility model embodiment, and shown in Fig. 2 a, this system comprises downhole system 2a02 and aboveground system 2a04.
Downhole system 2a02 is used for gathering and sending downhole data;
Aboveground system 2a04 is used for receiving and handling this downhole data;
Wherein, downhole system comprises the transmitter among the embodiment three, be used for sending downhole data to aboveground system, this downhole data can comprise following one of at least: inclination angle, orientation, tool-face, temperature, natural gamma, pressure, electromagnetic resistivity.
Transmitter is exported effective power by antenna under this technical guarantee Different Strata resistivity conditions, thereby ensures that aboveground system can detect signal.
Embodiment five
Fig. 3 is the structured flowchart according to the Adaptive matching power amplifier of the utility model preferred embodiment, as shown in Figure 3, this power amplifier comprises that amplification promotes level 40, complementary push-pull output stage 50, voltage and current detection circuit 60, power calculation circuit 70, power negative feedback control circuit 80, adjust power module 90, wherein, voltage and current detection circuit 60 is equivalent to the detection module among Fig. 2, power calculation circuit 70 and power negative feedback control circuit 80 are equivalent to the comparison module 20 among Fig. 2, and adjustment power module 90 and complementary push-pull output stage 50 are equivalent to the adjusting module 30 among Fig. 2.
Power amplifier in the present embodiment adopts switching mode complementary push-pull amplifier, and output stage is operated in the saturation conduction state.Voltage and current detection circuit 60 is measured output voltage and electric current in real time, and power calculation circuit 70 calculates and power output.Power negative feedback control circuit 80 is power output and calibration power value (differential amplification) relatively, when power output and calibration power differ, adjust power module 90 by the supply power voltage of power negative feedback adjustment output stage power supply, when power output overgauge power, reduce supply power voltage; Then increase supply power voltage on the contrary, reach the dynamic equilibrium of power output according to this.
To describe each part of power amplifier below in detail: amplify promotion level 40, complementary push-pull output stage 50, voltage and current detection circuit 60, power calculation circuit 70, power negative feedback control circuit 80, adjust power module 90.
(1) amplifies promotion level 40
Fig. 3 a is the circuit diagram that promotes level according to the amplification of the utility model preferred embodiment, shown in Fig. 3 a, A1, B1 are two inputs, an end that connects first resistance 402 and second resistance 404 respectively, the other end of first resistance 402 links to each other with the 3rd resistance 406 of parallel connection and the tie point of differential amplifier 408, the other end of second resistance 404 links to each other the other end ground connection of the 4th resistance 410 with the 4th resistance 410 of parallel connection and the tie point of differential amplifier 408.The output of differential amplifier 408 links to each other with an end of first electric capacity 412, and the other end of first electric capacity 412 links to each other with an input of follower 414, and the output of follower 414 feeds back to output voltage another input of follower 414.C1 is the output of follower 414.Follower 414 is also respectively by second electric capacity 416 and the 3rd electric capacity 418 ground connection.
During work, the two-way Transistor-Transistor Logic level pulse train of A1, complementation input time of B1 two ends forms the bipolar square wave signal after differential amplifier 408 difference are amplified.This bipolar square wave signal can be used as the transmitter carrier sequence, can corresponding change carrier frequency by changing pulse duration, variation by the control carrier phase realizes that phase keying produces modulation signal, this modulation signal drives through power amplifier, send electromagnetic signal by transmitting antenna to the stratum, the reception of surface well reception antenna, filtering, amplification, demodulating and decoding carry out data and recover.Follower 414 is mainly as promoting level.
(2) the complementary push-pull output stage 50
Fig. 3 b is the circuit diagram according to the complementary push-pull output stage of the utility model preferred embodiment, and shown in Fig. 3 b, S is input, links to each other with the output C1 shown in Fig. 3 a.The other end of input S links to each other with the 6th resistance 504 with the 5th resistance 502 of parallel connection.The other end of the 5th resistance 502 links to each other with first power amplifier tube 506, an output of first power amplifier tube 506 links to each other with positive source, the tie point of first power amplifier tube 506 and positive source links to each other with an end of the 4th electric capacity 516, the other end ground connection of the 4th electric capacity 516, another output links to each other with an end of the 7th resistance 508, and the tie point of the 7th resistance 508 and first power amplifier tube 506 constitutes an output terminals A of complementary push-pull output stage.The other end of the 7th resistance 508 links to each other with the 8th resistance 510, the tie point of the two is another output B of complementary push-pull output stage, the end that output B is connected with the 7th resistance 508 also links to each other with an end of the 9th resistance 518, the other end ground connection of the 9th resistance 518.The other end of the 6th resistance 504 links to each other with the input of second power tube 512, an output termination power cathode of second power tube 512, second power tube 512 links to each other with an end of the 5th electric capacity 514 with the tie point of power cathode, the other end ground connection of the 5th electric capacity 514, another output links to each other with the other end of the 8th resistance 510.The tie point of second power tube 512 and the 8th resistance 510 is another output C of complementary push-pull output stage.
The complementary push-pull output stage is complementary push-pull switching mode amplifier in the present embodiment, amplify and promote level by the input S of the promotion output signal input complementary push-pull output stage of output C1 output, through the first power tube 506(N raceway groove), the second power tube 512(P raceway groove) amplify after, be loaded on load regulation nine resistance 518.First power tube 506 and second power tube 512 all adopt the Vmos pipe, and selected Vmos pipe is under the saturation conduction condition, and conducting resistance is very little, has only several milliohms.The 7th resistance 508, the 8th resistance 510 are sample resistance, and the 9th resistance 518 is equivalent load resistance.Suppose that complementary push-pull output stage power supply is generating positive and negative voltage V+, V-, the 7th resistance 508 is R
3, the 8th resistance 510 is R
4, the 9th resistance 518 is R
L
Set:
V+=|V-|=U (1)
R
3=R
4=R (2)
Because Vmos pipe conducting resistance is minimum, so its power consumption can be ignored.Power amplifier output amplitude power is:
Po≈U
2*R
L/（R+R
L）2 (3)
As load R
L" during R
Po≈U
2/R
L (4)
In the reality, sample resistance is as far as possible little, generally much smaller than load resistance, can reduce idle power consumption like this.
(3) voltage and current detection circuit 60
Voltage and current detection circuit 60 is used for the voltage and current amplitude of detection power amplifier output, suppose by measurement sample resistance both end voltage amplitude V
R(R
3Or R
4), therefore, output current is:
Io=V
R/R (5)
By to R
LTwo end signals carry out the voltage U o that linear detection can obtain load end, make Io and Uo accurate by adjusting the measuring circuit gain.
(4) power calculation circuit 70
Fig. 3 c is the circuit diagram according to the power calculation circuit of the utility model preferred embodiment, and shown in Fig. 3 c, power calculation circuit mainly comprises multiplier 702, the 6th electric capacity 704, the 7th electric capacity 706.
Multiplier 702 can adopt the AD734 multiplier.The AD734 multiplier has 14 pins, suppose that first and second pin is respectively X1, X2, the the 3rd to five pin is respectively U0, U1, U2, six, seven pins are respectively Y1, Y2, and the 8th pin is VN, and the 9th pin is ER, ten, 11 pins are respectively Z1, Z2, the 12 pin is W, and the 13 pin is DD, and the 14th pin is VP.Wherein, X1, Y1 insert voltage and current respectively, and X2, Y2, Z2, U0, U1, U2 be ground connection respectively.The 8th pin is-the 15V power supply, and the 7th electric capacity 706 is as power filtering capacitor, and an end links to each other with the 8th pin, other end ground connection.The 14 pin is+the 15V power supply, and the 6th electric capacity 704 is as power filtering capacitor, and an end links to each other with the 14 pin, other end ground connection.The tenth pin ground connection.The 11,12 pins link to each other, output normalized power magnitude of voltage
Such as, voltage U o, Io introduce X1, Y1 respectively, X2, Y2, the equal ground connection of Z2, and output normalized power: PW=UoIo/10, if setting power is 10W, then the normalized power magnitude of voltage is 1V.
(5) the power negative feedback control circuit 80
Power negative feedback control circuit 80 is preset standard power voltage value and the real-time power voltage value (differential amplification) of measuring relatively, when being actual power overgauge power in comparative result Δ P＞0, reduces FEEDBACK CONTROL voltage V
CFEEDBACK CONTROL voltage V on the contrary then raises
CThis circuit is set maximum operating currenbt I simultaneously
M, in like manner, when the calibration power current value with when measuring in real time the difference DELTA I of power current value＞0, reduce FEEDBACK CONTROL voltage V
CThereby, reach the control operating current and be no more than the effect of setting limiting value.Generally, have only when load resistance that Current Control plays overcurrent protection under the minimum or short-circuit condition.
(6) adjust power module 90
Adjust power module 90 and adjust power supply for electronics, be the power amplifier output-stage power supply, its control end is the control voltage V from the output of power negative feedback control circuit 80
CIts output voltage V +/V-is controlled by V
CTerminal voltage, its maximum open circuit voltage ± U
MChange V
CTerminal voltage can control adjust power module 90 outputs 0～± U
MControl voltage V
CPower module 90 output sizes are adjusted in control, thereby change power output.
Power negative-feedback circuit 80 according to the lowest high-current value of measured power and electric current and preset standard power relatively, when the lowest high-current value of overgauge power or operating current when allowing operating current greater than maximum, FEEDBACK CONTROL voltage V
CReduce that thereby the output stage supply power voltage is corresponding to be reduced; Opposite when less than the calibration power value, FEEDBACK CONTROL voltage V
CIncrease thereby increase the output stage supply power voltage, therefore realized power output dynamic equilibrium, namely realized the dynamic coupling of power amplifier and load.
Dynamically matching properties depends on adjustment power module 90 maximum output voltage value sizes, as load R
LDuring=0.1 Ω～6.4 Ω, set rated output power P
e=10W, then maximum output voltage at least ± 8V, could satisfy the dynamic coupling (10W is constant) in whole interval; Work as R
LDuring=0.1 Ω～50 Ω, then maximum open circuit voltage is at least ± 22.4V.
It is the established standards watt level that present embodiment allows to change rated power, satisfies different depth transmission demand.The down-hole is crept under the state power supply and is adopted battery-poweredly mostly, when not needing can to set the selection low-power mode as required when high-power, saves battery power consumption, prolongs the down-hole battery working time.
From above description; as can be seen; the utility model has been realized following technique effect: transless Adaptive matching switch-mode power amplifier under the dynamic load variations condition; dependable performance; efficient is higher; satisfy by rational seal approach and to creep into reliable and stable work under the conditions such as vibration in the state, impact, high temperature, high pressure, simultaneously, reasonably the overcurrent protection measure makes that unlikely power amplifier damages under the output short-circuit state.Power amplifier output-stage is operated in switching mode, and selected pipe saturation conduction resistance is minimum, is in no heating state substantially, even under the tens A current conditions, the Vmos power tube can not burn out.Do not had transformer simultaneously, the transmitter volume dwindles greatly, adapts in the measurement while drilling to use.In addition, the switching mode amplifier is operated on off state, and when particularly adopting the Vmos pipe, saturation conduction resistance is minimum, generally in several milliohms.Therefore, the power tube dissipation power can be ignored, and efficient is very high, even also can not produce excessive heat at big current work, reliability is also high.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present utility model or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the utility model is not restricted to any specific hardware and software combination.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. a power amplifier is characterized in that, comprising:
Detection module is used for detecting in real time the voltage amplitude of described power amplifier output-stage and current amplitude and calculates power output according to described voltage amplitude and current amplitude;
Comparison module is used for more described power output and calibration power, and adjusts the FEEDBACK CONTROL voltage of described power amplifier according to comparative result;
Adjusting module is used for adjusting the supply power voltage of described power amplifier output-stage according to described FEEDBACK CONTROL voltage, and then controls the power output of described power amplifier.
2. power amplifier according to claim 1, it is characterized in that, also comprise: amplify the promotion level, be used for the pulse signal of input is handled generation bipolar square wave signal, adjust the amplitude of described square-wave signal according to described supply power voltage, wherein, the amplitude of described square-wave signal is directly proportional with described supply power voltage, and utilizes the power output of described power amplifier to drive described square-wave signal by the transmission antennas transmit electromagnetic signal.
3. power amplifier according to claim 2, it is characterized in that, described amplification promotion level is used for the Transistor-Transistor Logic level pulse signal of the two-way time complementation of input is modulated, and the differential amplification of the signal after will modulating produces the bipolar square wave signal, amplify the square-wave signal after modulating then, and the square-wave signal after the described amplification is loaded into the output stage of described power amplifier.
4. according to claim 2 or 3 described power amplifiers, it is characterized in that, described comparison module be used for following one of at least:
Obtain the power output magnitude of voltage according to described power output, more described power output magnitude of voltage and with the corresponding calibration power magnitude of voltage of described calibration power, under the situation of described power output magnitude of voltage greater than described calibration power magnitude of voltage, reduce FEEDBACK CONTROL voltage, otherwise, improve FEEDBACK CONTROL voltage;
More described current amplitude and the maximum operating current amplitude that allows under the situation of described current amplitude greater than described maximum permission operating current amplitude, reduce FEEDBACK CONTROL voltage.
5. power amplifier according to claim 4 is characterized in that, described square-wave signal is data modulated signal, wherein,
The modulating mode of described modulation signal is phase-shift keying, differential phase-shift keying (DPSK), frequency shift keying or amplitude keying.
6. power amplifier according to claim 4, it is characterized in that described power amplifier is the switching mode amplifier, its output stage is operated on off state, be output as the bipolar square wave signal, the amplitude of described square-wave signal is determined by the supply power voltage of the output stage of described power amplifier.
7. a transmitter is characterized in that, comprises each described power amplifier in the aforesaid right requirement 1 to 6, is used for dynamically mating with transmitting antenna.
8. a wireless drilling measuring system is characterized in that, comprising:
Downhole system is used for gathering and sending downhole data;
Aboveground system is used for receiving and handling described downhole data;
Wherein, described downhole system comprises the described transmitter of claim 7, is used for sending described downhole data to described aboveground system.
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| CN 201220682622 CN203219249U (en) | 2012-12-11 | 2012-12-11 | Power amplifier, transmitter and wireless measurement while drilling system |
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| CN 201220682622 CN203219249U (en) | 2012-12-11 | 2012-12-11 | Power amplifier, transmitter and wireless measurement while drilling system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117717A (en) * | 2012-12-11 | 2013-05-22 | 中国电子科技集团公司第二十二研究所 | Power amplifier and implementing method thereof, transmitter and wireless measurement while drilling system |
| CN111441760A (en) * | 2020-04-01 | 2020-07-24 | 华中科技大学 | Throwing and fishing type underground wireless transmission system, wireless charging equipment and method |
| CN113593213A (en) * | 2021-09-05 | 2021-11-02 | 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） | Ground transmitting device and method suitable for wireless remote measuring system for drilling |
| CN115061529A (en) * | 2022-07-08 | 2022-09-16 | 陕西科技大学 | NNBI radio frequency power source output power control system |
-
2012
- 2012-12-11 CN CN 201220682622 patent/CN203219249U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117717A (en) * | 2012-12-11 | 2013-05-22 | 中国电子科技集团公司第二十二研究所 | Power amplifier and implementing method thereof, transmitter and wireless measurement while drilling system |
| CN103117717B (en) * | 2012-12-11 | 2017-03-15 | 中国电子科技集团公司第二十二研究所 | Power amplifier and its implementation, transmitter and wireless drilling measuring system |
| CN111441760A (en) * | 2020-04-01 | 2020-07-24 | 华中科技大学 | Throwing and fishing type underground wireless transmission system, wireless charging equipment and method |
| CN113593213A (en) * | 2021-09-05 | 2021-11-02 | 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） | Ground transmitting device and method suitable for wireless remote measuring system for drilling |
| CN115061529A (en) * | 2022-07-08 | 2022-09-16 | 陕西科技大学 | NNBI radio frequency power source output power control system |
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