CN104656148A - High-power constant-current source emission system and high-power constant-current source emission method - Google Patents
High-power constant-current source emission system and high-power constant-current source emission method Download PDFInfo
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- CN104656148A CN104656148A CN201510119271.3A CN201510119271A CN104656148A CN 104656148 A CN104656148 A CN 104656148A CN 201510119271 A CN201510119271 A CN 201510119271A CN 104656148 A CN104656148 A CN 104656148A
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Abstract
The invention relates to a high-power constant-current source emission system and a high-power constant-current source emission method. The emission system comprises a three-phase alternating current power supply, a three-phase rectifier, a high-frequency inverter, a booster rectifier, an emission H bridge and an emission electrode, wherein the three-phase alternating current provided by the three-phase alternating current power supply is subjected to rectification, high-frequency inversion, transformer boosting and high-frequency rectification, variable-frequency current is injected to the ground by the emission H bridge and the emission electrode, output current is constant, and voltage is stabilized without additional load when emission is conducted by adopting a time domain method. The portability and minimization of instruments can be realized by adopting power electronic high-frequency technology, a PWM control mode is adopted during high-frequency inversion part, and by adopting soft switch technology, and the loss of a high-frequency switch can be greatly decreased.
Description
Technical field
The present invention relates to electromagnetic survey technical field, relate more specifically to a kind of high-power constant current grounded source emission coefficient and method.
Background technology
Along with China's rapid development of economy and the increase to energy demand, mineral resources exploration becomes the important subject of geophysics field.The geologic structure that underground oil and gas resource is formed belongs to resistive formation, and for the Exploration of Oil And Gas under complicated geological structure, traditional time domain method detectivity is limited.Be laid to loop line with earth-free wire and pass to the method that pulse current is excitation field source, belong to simple magnetic source to launch, i.e. permanent electricity (TE) pattern, this emission mode is mainly used in the detection of ground lower conductiving layer, insensitive to the resistive formation of hydrocarbon zone and so on.Pass to earth lead the method that pulse current is excitation field source, be called grounded source transient electromagnetic method, be permanent magnetic (TM) pattern, be mainly used in the detection of underground resistive formation.
Bipolar square wave launched by high-power constant current grounded source transmitter, the secondary field signal responded to from buried target body after receiving the power-off of primary field square wave, by analyzing the secondary field time and space distribution that receiving coil observes, obtains the information of buried target body.The key index launched builds high-quality incident field source, and the key obtaining the incident field source of high-quality launches high-quality current waveform.
Existing high-power transmitter exist rather voluminous, instruments weight very large, be inconvenient to transport and the problem of field construction.Owing to mostly adopting constant voltage to launch, when transmission frequency changes, the load between emitting electrode is due to the impact of kelvin effect, and impedance operator has very large change.Constant voltage is launched can not ensure that transmitter current is constant, can affect output voltage current waveform, cause transmitter current of low quality.In addition, in the method for time domain, require to launch the waveform with certain dutycycle, the such as waveform of 50% dutycycle, existing high-power instrument work adopts extra load device under these conditions mostly, make emitting device more complicated, huge, also consumes energy more, during the load of impact anticlimax, also can cause the instability that electric current and voltage exports.
Therefore, in the urgent need to inventing a kind of high-power constant current grounded source transmitter of variable transmission dutycycle, variable transmission frequency of can taking to meet the instrument demand of geophysical survey.
Summary of the invention
For above-mentioned technological deficiency, one of fundamental purpose of the present invention is to provide a kind of high-power constant current grounded source emission coefficient and method, to realize the light of geophysical survey system transmitter and miniaturization, improve the quality of emitting voltage current waveform, improve the stability of emission coefficient.
For achieving the above object, technical solution of the present invention is:
A kind of high-power constant current grounded source emission coefficient, comprise AC power, rectifier, high-frequency inverter, boost rectifier, transmitting H bridge and emitting electrode, it is characterized in that, the output of described AC power connects the input of described rectifier, the output of described rectifier connects the input of described high-frequency inverter, the output of described high-frequency inverter is input to described boost rectifier through capacitor filtering, the output of described boost rectifier is connected to the input of described transmitting H bridge, and the output of described transmitting H bridge is connected to described emitting electrode.
Wherein, the threephase alternator of described AC power to be phase voltage be 110V or 220V.
Wherein, described rectifier is uncontrollable diode rectifier bridge.
Wherein, described high-frequency inverter is the H bridge of four IGBT switch compositions, and frequency of operation is 20KHz, adopts the working method of Sofe Switch that direct current is converted to high-frequency alternating current.
Wherein, described boost rectifier comprises step-up transformer and uncontrollable single-phase rectifier, and the transformation ratio of described step-up transformer is 1: 2 ~ 5, and preferably 1: 2.5.
Wherein, described transmitting H bridge is the H bridge of four IGBT switch compositions.
Wherein, the output of described high-frequency inverter, series connection access capacitor carries out filtering.
Wherein, described high-power constant current grounded source emission coefficient also comprises control circuit, and described control circuit comprises man-machine interface, three phase rectifier DC voltage testing circuit, emitting voltage testing circuit, transmitter current testing circuit, driving circuit, PWM control module and master controller; And
Described three phase rectifier DC voltage testing circuit, emitting voltage testing circuit, transmitter current testing circuit gather the voltage of output, electric current and three phase rectifier DC voltage respectively, feed back to described master controller, compare with the output current value that described man-machine interface is given, difference is relatively after calculation process, amplitude limiting processing, produced the drive singal of high-frequency inverter by described PWM control module, control described high-frequency inverter work by the driving circuit of described high-frequency inverter; Meanwhile, the transmitted waveform of setting and frequency translation are drive singal by described master controller, control the work of described transmitting H bridge by described transmitting H-bridge drive circuit.
Wherein, the waveform of described transmitting is bipolar square wave, changes in the frequency of the transmitted waveform scope from direct current to 10KHz.
And a kind of high-power constant current grounded source launching technique of high-power constant current grounded source emission coefficient described above, comprises the following steps:
Three-phase alternating current is input to three phase rectifier by three-phase alternating-current supply, and described three-phase alternating current is converted to direct current by described three phase rectifier, and uses electrochemical capacitor filtering;
Be input in high-frequency inverter by the direct current after described capacitor filtering, described direct current is converted to high-frequency alternating current by described high-frequency inverter, and is input to boost rectifier;
Step-up transformer in described boost rectifier, by after described high-frequency ac electric boost, by single-phase uncontrollable rectifier rectification, re-uses capacitor filtering and obtains direct current;
Be input to by the direct current that described boost rectifier obtains and launch H bridge, described transmitting H bridge sets waveform according to master controller, is launched by energy by emitting electrode.
Known based on technique scheme, technical scheme of the present invention possesses following beneficial effect:
1, emission coefficient of the present invention is little with existing emission coefficient phase specific volume, lightweight, mainly because pass through the method for power electronics high frequency, reduce the volume and weight of element, reduced the volume and weight of heating radiator by soft switch technique, therefore reach the effect reducing emission coefficient volume and weight;
2, emission coefficient of the present invention adopts constant current lift-off technology, by the direct control to transmitter current waveform, when loaded impedance changes, can keep current constant, reach the effect ensureing the incident field source of high-quality;
3, emission coefficient of the present invention is when launching the waveform with certain dutycycle, do not use extra load, by the control to emitting voltage, it is relatively stable that emission coefficient of the present invention can realize emitting voltage, reduce complexity and the volume of emitting device, reduce the consumption of the energy.
Accompanying drawing explanation
Fig. 1 is the main circuit topological structure figure of high-power constant current grounded source emission coefficient of the present invention;
Fig. 2 is the circuit diagram of a part for three phase rectifier of the present invention;
Fig. 3 is the circuit diagram of a part for high-frequency inverter of the present invention and boost rectifier;
Fig. 4 is the circuit diagram of a part for transmitting H bridge of the present invention;
Fig. 5 is the method flow diagram that high-power constant current grounded source emission coefficient of the present invention carries out launching;
Fig. 6 is the control circuit structural drawing of high-power constant current grounded source emission coefficient of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
The invention discloses a kind of high-power constant current grounded source emission coefficient, comprise AC power, rectifier, high-frequency inverter, boost rectifier, transmitting H bridge and emitting electrode, wherein, the output of AC power connects the input of rectifier, the output of rectifier connects the input of high-frequency inverter, the output of high-frequency inverter is input to boost rectifier through capacitor filtering, and the output of boost rectifier is connected to the input of launching H bridge, and the output of launching H bridge is connected to emitting electrode.
Wherein, the threephase alternator of AC power to be phase voltage be 110V or 220V.Rectifier is uncontrollable diode rectifier bridge.High-frequency inverter is the H bridge of four IGBT switch compositions, and frequency of operation is 20KHz, adopts the working method of Sofe Switch that direct current is converted to high-frequency alternating current.Boost rectifier comprises step-up transformer and uncontrollable single-phase rectifier, and the transformation ratio of step-up transformer is 1: 2 ~ 5, and preferably 1: 2.5.Launch the H bridge that H bridge is four IGBT switch compositions.The output of high-frequency inverter, series connection access capacitor carries out filtering.
Wherein, high-power constant current grounded source emission coefficient also comprises control circuit, and described control circuit comprises man-machine interface, three phase rectifier DC voltage testing circuit, emitting voltage testing circuit, transmitter current testing circuit, driving circuit, PWM control module and master controller;
Three phase rectifier DC voltage testing circuit, emitting voltage testing circuit, transmitter current testing circuit gather the voltage of output, electric current and three phase rectifier DC voltage respectively, feed back to master controller, compare with the output current value that man-machine interface is given, difference is relatively after calculation process, amplitude limiting processing, produced the drive singal of high-frequency inverter by PWM control module, control high-frequency inverter work by the driving circuit of high-frequency inverter; Meanwhile, the transmitted waveform of setting and frequency translation are drive singal by master controller, control to launch the work of H bridge by launching H-bridge drive circuit.
Wherein, transmitted waveform is bipolar square wave, changes in the frequency of the transmitted waveform scope from direct current to 10KHz.
In addition, the invention also discloses a kind of high-power constant current grounded source launching technique of high-power constant current grounded source emission coefficient described above, comprise the following steps:
Three-phase alternating current is input to three phase rectifier by three-phase alternating-current supply, and three-phase alternating current is converted to direct current by three phase rectifier, and uses electrochemical capacitor filtering;
Be input in high-frequency inverter by the direct current after capacitor filtering, direct current is converted to high-frequency alternating current by high-frequency inverter, and is input to boost rectifier;
Step-up transformer in boost rectifier, by after high-frequency ac electric boost, by single-phase uncontrollable rectifier rectification, re-uses capacitor filtering and obtains direct current;
The direct current obtained by boost rectifier is input to launches H bridge, launches H bridge and sets waveform according to master controller, launched by energy by emitting electrode.
Below in conjunction with accompanying drawing, explanation is illustrated in more detail to technical scheme of the present invention.
1, main circuit technical scheme:
Fig. 1 is the main circuit topological structure figure of high-power constant current grounded source emission coefficient of the present invention, comprising: three-phase alternating-current supply, three phase rectifier, high-frequency inverter, boost rectifier, transmitting H bridge and emitting electrode.
Main circuit part composed as follows: the output of three-phase alternating-current supply connects the input of three phase rectifier, the output of three phase rectifier is through Capacitor banks filtering voltage regulation, be input to high-frequency inverter, the output of high-frequency inverter is input to boost rectifier through capacitor filtering, the output of boost rectifier is input to transmitting H bridge portion through the filtering of electric capacity, and the output of launching H bridge portion connects emitting electrode.
Wherein, the alternator of three-phase alternating-current supply to be phase voltage be 110V or 220V.Three phase rectifier is uncontrollable diode rectifier bridge, and concrete structure as shown in Figure 2, becomes rectifier bridge by six commutation diode Y-connections.High-frequency inverter is the H bridge of four IGBT compositions, and as shown in Figure 3, it outputs to the input end of step-up transformer, and output series connection access capacitor has carried out filtering.Boost rectifier comprises step-up transformer and uncontrollable single-phase rectifier, and the transformation ratio of transformer is generally 1: 2.5.Launch the H bridge that H bridge is four IGBT compositions, as shown in Figure 4, its output terminal is connected with emitter A, B.The workflow of high-power constant current grounded source emission coefficient of the present invention as shown in Figure 5, comprising:
Step one: three-phase alternating-current supply provides three-phase alternating current to the input of three phase rectifier, and three-phase alternating current is converted to direct current by three phase rectifier, and uses capacitor filtering.
Step 2: be input in high-frequency inverter by the direct current after capacitor filtering, direct current is converted to high-frequency alternating current by high-frequency inverter, is input to boost rectifier.
Step 3: the high-frequency alternating current that high-frequency inverter exports after step-up transformer boosting, after single-phase uncontrollable rectifier rectification, uses capacitor filtering to obtain direct current in boost rectifier.
Step 4: the direct current that boost rectifier obtains is input to launches H bridge, launches H bridge and sets waveform according to main control unit, to be transmitted into energy in medium by electrode and to go.
Such as, when three-phase alternating-current supply be input as the alternating current of single-phase 220V time, alternating current is converted to the direct current of about 530V by three phase rectifier, high-frequency inverter is input to after capacitor filtering, the frequency of operation of high-frequency inverter is 20kHz, be the alternating current of high frequency by DC power conversion, boosted by high-frequency transformer, the transformation ratio of transformer is 1: 2.5, then through overcommutation, is direct current by the convert alternating current of high frequency, after capacitor filtering, be supplied to transmitting bridge, launch the transmitted waveform work of bridge according to setting, by energy transferring to emitting electrode.
2, control circuit technical scheme:
As shown in Figure 6, emission coefficient of the present invention also comprises control circuit part, and this part comprises: man-machine interface, three phase rectifier DC voltage testing circuit, emitting voltage current detection circuit, temperature sensing circuit, driving circuit, PWM control module and master controller.
The course of work of control circuit part is as follows:
Gather the electric current and voltage and three phase rectifier DC voltage that export, feed back to main control unit, compare with the output parameter that man-machine interface is given, result is relatively after calculation process, amplitude limiting processing, produced the drive singal of high-frequency inverter by PWM control module, control high-frequency inverter work by driving circuit.The transmitted waveform of setting is converted into drive singal at main control unit simultaneously, controls to launch the work of H bridge by driving circuit.
Wherein, output electric current measure can also be arranged on the DC side of launching before H bridge, the electric current collected on the occasion of, effect is identical with gathering (transmitter current detects) on firing cable.
The waveform frequency launched can change in the scope from direct current to 10KHz, and dutycycle can be 100%, also can change within the scope of 0-100%.
Under the control of main control unit, the current amplitude of transmitting is stable, and when dutycycle is not 100%, by compensating, voltage is metastable equally, now, launches and does not need to adopt extra load device.
Verify by experiment, emission coefficient of the present invention, owing to have employed power electronics high frequency technology, achieves the light of instrument and miniaturization.Have employed PWM control mode in high-frequency inversion part, adopt Sofe Switch form simultaneously, greatly reduce HF switch loss, reduce the volume of thermal value and heating radiator, the geologic prospecting work for field preferably.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a high-power constant current grounded source emission coefficient, comprise AC power, rectifier, high-frequency inverter, boost rectifier, transmitting H bridge and emitting electrode, it is characterized in that, the output of described AC power connects the input of described rectifier, the output of described rectifier connects the input of described high-frequency inverter, the output of described high-frequency inverter is input to described boost rectifier through capacitor filtering, the output of described boost rectifier is connected to the input of described transmitting H bridge, and the output of described transmitting H bridge is connected to described emitting electrode.
2. high-power constant current grounded source emission coefficient as claimed in claim 1, the threephase alternator of wherein said AC power to be phase voltage be 110V or 220V.
3. high-power constant current grounded source emission coefficient as claimed in claim 1, wherein said rectifier is uncontrollable diode rectifier bridge.
4. high-power constant current grounded source emission coefficient as claimed in claim 1, wherein said high-frequency inverter is the H bridge of four IGBT switch compositions, and frequency of operation is 20kHz, adopts the working method of Sofe Switch that direct current is converted to high-frequency alternating current.
5. high-power constant current grounded source emission coefficient as claimed in claim 1, wherein said boost rectifier comprises step-up transformer and uncontrollable single-phase rectifier, and the transformation ratio of described step-up transformer is 1: 2 ~ 5, and preferably 1: 2.5.
6. high-power constant current grounded source emission coefficient as claimed in claim 1, wherein, described transmitting H bridge is the H bridge of four IGBT switch compositions.
7. high-power constant current grounded source emission coefficient as claimed in claim 1, wherein, the output of described high-frequency inverter, series connection access capacitor carries out filtering.
8. high-power constant current grounded source emission coefficient as claimed in claim 1, wherein said high-power constant current grounded source emission coefficient also comprises control circuit, and described control circuit comprises man-machine interface, three phase rectifier DC voltage testing circuit, emitting voltage testing circuit, transmitter current testing circuit, driving circuit, PWM control module and master controller; And
Described three phase rectifier DC voltage testing circuit, emitting voltage testing circuit, transmitter current testing circuit testing circuit gather the voltage of output, electric current and three phase rectifier DC voltage respectively, feed back to described master controller, compare with the output current value that described man-machine interface is given, difference is relatively after calculation process, amplitude limiting processing, produced the drive singal of high-frequency inverter by described PWM control module, control described high-frequency inverter work by the driving circuit of described high-frequency inverter; Meanwhile, the transmitted waveform of setting and frequency translation are drive singal by described master controller, control the work of described transmitting H bridge by described transmitting H-bridge drive circuit.
9. high-power constant current grounded source emission coefficient as claimed in claim 8, the waveform of wherein said transmitting is bipolar square wave, changes in the frequency of the transmitted waveform scope from direct current to 10KHz.
10. the high-power constant current grounded source launching technique of high-power constant current grounded source emission coefficient as claimed in claim 1, comprises the following steps:
Three-phase alternating current is input to three phase rectifier by three-phase alternating-current supply, and described three-phase alternating current is converted to direct current by described three phase rectifier, and uses electrochemical capacitor filtering;
Be input in high-frequency inverter by the direct current after described capacitor filtering, described direct current is converted to high-frequency alternating current by described high-frequency inverter, and is input to boost rectifier;
Step-up transformer in described boost rectifier, by after described high-frequency ac electric boost, by single-phase uncontrollable rectifier rectification, re-uses capacitor filtering and obtains direct current;
Be input to by the direct current that described boost rectifier obtains and launch H bridge, described transmitting H bridge sets waveform according to master controller, is launched by energy by emitting electrode.
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Cited By (7)
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| CN104865606A (en) * | 2015-06-05 | 2015-08-26 | 中国海洋大学 | High-effect large-current electromagnetic transmitting system and method |
| CN106208734A (en) * | 2016-08-22 | 2016-12-07 | 中国科学院电子学研究所 | Transient electromagnetic exploration system transmitter |
| CN106873043A (en) * | 2017-04-14 | 2017-06-20 | 吉林大学 | The shallow earth's surface magnetic source emitter and its control method of a kind of double-loop feedbackc |
| CN107515321A (en) * | 2016-06-16 | 2017-12-26 | 浙江正泰电器股份有限公司 | The method of the output current response time of constant current source control system and shortening constant-current source |
| CN108241175A (en) * | 2016-12-23 | 2018-07-03 | 中国船舶重工集团公司第七研究院 | A kind of time-domain electromagnetic exploration method using high-power stationary source |
| CN110034693A (en) * | 2019-04-29 | 2019-07-19 | 郑州铁路职业技术学院 | A kind of automatic controller for outputting three-phase current steadily |
| 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 |
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| CN107515321A (en) * | 2016-06-16 | 2017-12-26 | 浙江正泰电器股份有限公司 | The method of the output current response time of constant current source control system and shortening constant-current source |
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| CN106873043B (en) * | 2017-04-14 | 2018-10-23 | 吉林大学 | A kind of shallow earth's surface magnetic source transmitter and its control method of double-loop feedbackc |
| CN110034693A (en) * | 2019-04-29 | 2019-07-19 | 郑州铁路职业技术学院 | A kind of automatic controller for outputting three-phase current steadily |
| 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 |
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