CN105119588A - Pulse current transmission circuit adopting transient electromagnetic method - Google Patents
Pulse current transmission circuit adopting transient electromagnetic method Download PDFInfo
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- CN105119588A CN105119588A CN201510579646.4A CN201510579646A CN105119588A CN 105119588 A CN105119588 A CN 105119588A CN 201510579646 A CN201510579646 A CN 201510579646A CN 105119588 A CN105119588 A CN 105119588A
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Abstract
The invention relates to a pulse current transmission circuit adopting a transient electromagnetic method, and especially an emission current control circuit applicable to a multi-turn loop transmitting device of a magnetic source. A main power supply is connected with a Buck ZCS (Zero-Current-Switching)-PWM (Pulse-Width Modulation) converter, and the Buck ZCS-PWM converter controls the voltage at the two ends of a transmitting coil, so that the current of a rising edge and a flat top segment can be controlled; the Buck ZCS-PWM converter is connected with an H-bridge circuit, so as to control the current flow and realize that an emission current waveform is a bipolar trapezoidal wave; the H-bridge circuit is connected with the transmitting coil, and block diodes are connected to joints of the upper and lower bridge arms of the H-bridge circuit and the transmitting coil; the block diode is used for blocking the current of the transmitting coil from flowing towards the upper and lower bridge arms of the H-bridge circuit, and the blocking eliminates resonance caused by the current between a parasitic capacitor of the circuit and the transmitting circuit; the two ends of the transmitting coil are connected to an energy feedback constant voltage clamping circuit in parallel, wherein the energy feedback constant voltage clamping circuit controls a current falling edge, so that a clamp voltage of the current falling edge is improved and the falling edge time is shortened.
Description
Technical field
The present invention relates to a kind of transient electromagnetic method pulse current radiating circuit, be especially applicable to the emission current control circuit of the multiturn coil emitter of magnetic source.
Background technology
Magnetic source electromagnetic method instrument, adopts H-bridge circuit as the power conversion major loop of emitter usually, load is perception, for the power loss reducing load resistance adopts the coil load of large inductance, small resistor usually, especially at special occasions such as aeroelectromagnetic method, downhole electromagnetic methods, the size of coil is limited to some extent, in fact mostly adopt multiturn small coil.Therefore, the power conversion circuit for magnetic source electromagnetic method transmitter proposes special requirement.
Because loading coil resistance is smaller, therefore, when the output current flatness of wave stage keeps current stabilization in a certain fixed value, the supply power voltage of needs is less.But the time of current impulse rising edge and trailing edge affects large especially by supply power voltage, the too small meeting of supply power voltage makes rising edge and trailing edge time arrive greatly and cannot stand, generally adopt both at home and abroad now and improve supply power voltage, all utilize brachium pontis switching tube in H-bridge circuit to carry out the electric current memory effect of PWM (pulse-width modulation) hard switching control technology and loading coil in current impulse rising edge stage and flat-top stage, realize the controlled of output current.But this control technology adds the intensity that power conversion circuit produces electromagnetic interference, and increases the switching loss of bridge way switch device, because equipment is used on helicopter, the power limited that aircraft provides, so it is necessary to reduce switching loss; And, because existing circuit is all adopt H-bridge circuit switching device backward diode in parallel as freewheeling path, its trailing edge controls power supply and power supply is same power supply, voltage is too little, and owing to there is electric capacity in circuit, electric current can be formed and shake in electric capacity and inductance, so make trailing edge overshoot current large and cut-off current hangover is serious, the turn-off time is long.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of transient electromagnetic method pulse current radiating circuit, and solving the switching tube of brachium pontis in H-bridge circuit, to carry out PWM hard open pipe technical controlling both end voltage switching loss large; H-bridge circuit is closed and is had no progeny the reverse overshoot of trailing edge electric current greatly, and concussion hangover time is long, affects the problem of receiver data acquisition.
The present invention is achieved in that a kind of transient electromagnetic method pulse current radiating circuit, comprising: main power source, BuckZCS-PWM variator, H-bridge circuit, four blocking diodes, transmitting coil and energy regenerative constant voltage clamp circuits;
Main power source is connected with BuckZCS-PWM variator (pulse-width modulation of buck Zero Current Switch), controls transmitting coil both end voltage to realize controlling rising edge and flat-top section electric current by described BuckZCS-PWM variator; BuckZCS-PWM variator is connected with H-bridge circuit to realize controlling current direction and then realizing emission current waveform for bipolarity trapezoidal wave; H-bridge circuit is connected with transmitting coil, a blocking diode is respectively accessed in the upper and lower bridge arm of H-bridge circuit and transmitting coil connection, utilize blocking diode to stop the upper and lower bridge arm of the current direction H-bridge circuit of transmitting coil, block elimination electric current, between the parasitic capacitance and transmitting coil of circuit, resonance occurs; The energy regenerative constant voltage clamp circuit of transmitting coil two ends access control electric current in parallel trailing edge, improves the clamp voltage of electric current trailing edge, shortens the trailing edge time.
Further, parallel filtering circuit between ZCS-PWM variator and H-bridge circuit, carries out filtering to voltage in the present invention.
Further, main power source connects main switch V in the present invention
1rear output, resonant inductance L
rwith resonant capacitance C
rand auxiliary switch V
aat auxiliary switch V after series connection
aupper anti-paralleled diode D
va, form BuckZCS-PWM variator, H-bridge circuit is connected in parallel on resonant capacitance C
rand auxiliary switch V
aon cascaded structure.
The present invention further, a switching device V
2, switching device V
3, switching device V
4, and switching device V
5upper anti-paralleled diode D respectively
2, diode D
3, diode D
4, diode D
5form H-bridge circuit, transmitting coil is sequentially connected in series diode D by one end
10, electric capacity C
3with diode D
13rear formation discharge loop, transmitting coil is sequentially connected in series diode D by the other end
11, electric capacity C
3with diode D
12rear formation discharge loop, with an electric capacity C after electric capacity C3 series connection energy regenerative constant voltage clamp circuit
1parallel connection, electric capacity C
1be connected in parallel on main power source.
Further, energy regenerative constant voltage clamp circuit is the switch J be cascaded in the present invention
1with resistance R
1, switch J
1upper anti-paralleled diode D
1.
Compared with prior art, beneficial effect is in the present invention:
Original function utilizing the switching tube of brachium pontis in H-bridge circuit to carry out PWM hard open pipe technical controlling transmitting coil both end voltage is separated by the present invention, transmitting coil both end voltage is controlled at H-bridge circuit front end access BuckZCS-PWM control circuit, and only control current direction by H-bridge circuit, realize the Sofe Switch of switching tube, reduce the switching loss of switching tube, improve the power of radiating circuit.At transmitting coil two ends parallel connection access energy regenerative constant voltage clamp circuit, improve electric current trailing edge clamp voltage, shorten the trailing edge time.Between loading coil and H-bridge circuit upper and lower bridge arm, access blocking diode, eliminate electric current parasitic capacitance in circuit and the resonance of load inductance, and then reduce overshoot and the concussion of trailing edge electric current.
Accompanying drawing explanation
The novel transient electromagnetic method pulse current radiating circuit block diagram that Fig. 1 provides for the invention process;
The novel transient electromagnetic method pulse current radiating circuit schematic diagram that Fig. 2 provides for the invention process;
The output current rising edge that Fig. 3 provides for the invention process and flat-top section control circuit schematic diagram;
The radiating circuit drive singal that Fig. 4 provides for the invention process and output current wave;
The output current trailing edge control circuit schematic diagram that Fig. 5 provides for the invention process;
What Fig. 6 provided for the invention process removes overshoot circuit theory diagrams.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Magnetic source electromagnetic method emission current comprises forward output and negative sense exports two polarity, see Fig. 1, transient electromagnetic method pulse current radiating circuit block diagram, comprising: main power source, BuckZCS-PWM variator, H-bridge circuit, four blocking diodes, transmitting coil and energy regenerative constant voltage clamp circuits;
See Fig. 1 composition graphs 2, main power source U
1be connected with BuckZCS-PWM variator, control transmitting coil both end voltage to realize controlling rising edge and flat-top section electric current by described BuckZCS-PWM variator; BuckZCS-PWM variator is connected with H-bridge circuit to realize controlling current direction and then realizing emission current waveform for bipolarity trapezoidal wave; H-bridge circuit is connected with transmitting coil, and a blocking diode is respectively accessed in the upper and lower bridge arm of H-bridge circuit and transmitting coil connection, is respectively blocking diode D
6, blocking diode D
7, blocking diode D
8, blocking diode D
9, utilize blocking diode to eliminate electric current, between the parasitic capacitance and transmitting coil of circuit, resonance occur; The energy regenerative constant voltage clamp circuit of transmitting coil two ends access control electric current in parallel trailing edge, improves the clamp voltage of electric current trailing edge, shortens the trailing edge time.Parallel filtering circuit between ZCS-PWM variator and H-bridge circuit, carries out filtering to voltage.
Main power source U
1a high pressure is provided, by BuckZCS-PWM variator, Sofe Switch decompression transformation is carried out to high pressure, emission current bipolarity trapezoidal wave rising edge and the voltage required for the flat-top section stage are provided respectively, after decompression transformation, by filter circuit, filtering is carried out to voltage, reduce ripple and the noise of voltage, switch to reach by the direction of H-bridge circuit to provided voltage afterwards and produce Bipolar current waveform in transmitting coil, quit work at electric current trailing edge stage BuckZCS-PWM variator, so transmitting coil two ends forward voltage is zero, but because loading coil is inductance, electric current in inductance will continue flowing, again because the existence of blocking diode makes electric current not carry out afterflow by the backward diode of switching tube, the energy regenerative constant voltage clamp circuit by being connected in parallel with transmitting coil is only had to carry out afterflow, the counter voltage at transmitting coil two ends can be stabilized in one than main power source U by energy regenerative constant voltage clamp circuit
1the voltage that voltage is higher, accelerate the decline of electric current, shorten the time of electric current trailing edge, between transmitting coil and H-bridge circuit upper and lower bridge arm, access blocking diode, eliminate electric current parasitic capacitance in circuit and the resonance of load inductance, and then reduce overshoot and the concussion of trailing edge electric current.
See Fig. 2, main power source U
1connect main switch V
1rear output, main switch V
1rear upper anti-paralleled diode D
v1, resonant inductance L
rwith resonant capacitance C
rand auxiliary switch V
aat auxiliary switch V after series connection
aupper anti-paralleled diode D
va, form BuckZCS-PWM variator, H-bridge circuit is connected in parallel on resonant capacitance C
rand auxiliary switch V
aon cascaded structure.
Switching device V
2, switching device V
3, switching device V
4, and switching device V
5upper anti-paralleled diode D respectively
2, diode D
3, diode D
4, diode D
5form H-bridge circuit, transmitting coil is sequentially connected in series diode D by one end
10, electric capacity C
3with diode D
13rear formation discharge loop, transmitting coil is sequentially connected in series diode D by the other end
11, electric capacity C
3with diode D
12another discharge loop of rear formation, is respectively used to forward and reverse electric discharge, electric capacity C
3with an electric capacity C after series connection energy regenerative constant voltage clamp circuit
1parallel connection, electric capacity C
1be connected in parallel on main power source, for by electric capacity C
3electric energy recoil into electric capacity C
1middle storage.
Here transmitting coil is the equivalent model that inductance L series resistance R forms.
Be illustrated in figure 4 radiating circuit drive singal and output current wave, below in conjunction with the drive singal of each switching device, each control stage is described in detail, the same at forward with the control principle of negative sense due to bipolarity trapezoidal wave, so only carry out control principle explanation to forward trapezoidal wave.
T
1~ t
3period is that rise-time of current and flat-top section control the stage, is illustrated in figure 3 output current rising edge and flat-top section control circuit schematic diagram, t
1~ t
2period is that rise-time of current controls the stage, switching device V
2, switching device V
5conducting, controls main switch V
1with auxiliary switch V
acarry out switch with certain switching frequency and duty ratio, realize the switch tube zero current switch of BuckZCS-PWM variator, and provide voltage for transmitting coil, make transmitting coil electric current increase; t
2~ t
3period is that electric current flat-top section controls the stage, t
2moment transmitting coil electricity rises to the flat-top section current value of setting, now adjusts main switch V
1with auxiliary switch V
aduty ratio, what make output voltage that emission current can be made stable maintains flat-top section current value.Now current flow paths is: U
1→ V
1→ V
2→ D
6→ L → D
9→ V
5.
T
3~ t
4period is rise along the control stage under electric current, and BuckZCS-PWM variator quits work, switching device V
2, switching device V
5turn off, due to blocking diode D
6, blocking diode D
7, blocking diode D
8, blocking diode D
9transmitting coil L and H-bridge circuit are separated, so electric current trailing edge control circuit part and H-bridge circuit and BuckZCS-PWM translation circuit have nothing to do, so output current trailing edge control circuit schematic diagram as shown in Figure 5, in transmitting coil L, electric current is by diode D
11, electric capacity C
3, diode D
12continuous current circuit discharges, and in afterflow process, inductance L is electric capacity C
3charging, electric capacity C
3voltage provide clamp voltage for transmitting coil L, setting electric capacity C
3voltage stabilizing value be U
c3, as electric capacity C
3voltage be less than U
c3time, switch J
1turn off, inductance L is electric capacity C
3charging, electric capacity C
3voltage promote, as electric capacity C
3voltage be greater than U
c3time, switch J
1open-minded, the electric energy feedback in transmitting coil L is to storage capacitor C
1in, be next time emission current energy storage, so electric capacity C
3voltage can be stabilized in U
c3, because clamp voltage remains at U
c3, linearly decline so trailing edge electric current can be realized.
Be illustrated in figure 6 overshoot circuit, moment t
4there will be certain overshoot current afterwards, but due to blocking diode D
6, blocking diode D
7, blocking diode D
8, blocking diode D
9cut off the connection of transmitting coil and main circuit, make inductance L not with the electric capacity generation resonance in main circuit, so reduce overcharge electric current with shorten the trailing edge current tail time.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a transient electromagnetic method pulse current radiating circuit, is characterized in that, comprising: main power source, BuckZCS-PWM variator, H-bridge circuit, four blocking diodes, transmitting coil and energy regenerative constant voltage clamp circuits;
Main power source is connected with BuckZCS-PWM variator, controls transmitting coil both end voltage to realize controlling rising edge and flat-top section electric current by described BuckZCS-PWM variator; BuckZCS-PWM variator is connected with H-bridge circuit to realize controlling current direction and then realizing emission current waveform for bipolarity trapezoidal wave; H-bridge circuit is connected with transmitting coil, a blocking diode is respectively accessed in the upper and lower bridge arm of H-bridge circuit and transmitting coil connection, utilize blocking diode to stop the upper and lower bridge arm of the current direction H-bridge circuit of transmitting coil, block elimination electric current, between the parasitic capacitance and transmitting coil of circuit, resonance occurs; The energy regenerative constant voltage clamp circuit of transmitting coil two ends access control electric current in parallel trailing edge, improves the clamp voltage of electric current trailing edge, shortens the trailing edge time.
2. according to transient electromagnetic method pulse current radiating circuit according to claim 1, it is characterized in that, parallel filtering circuit between ZCS-PWM variator and H-bridge circuit, carries out filtering to voltage.
3. according to transient electromagnetic method pulse current radiating circuit according to claim 1, it is characterized in that, main power source connects main switch V
1rear output, resonant inductance L
rwith resonant capacitance C
rand auxiliary switch V
aat auxiliary switch V after series connection
aupper anti-paralleled diode D
va, form BuckZCS-PWM variator, H-bridge circuit is connected in parallel on resonant capacitance C
rand auxiliary switch V
aon cascaded structure.
4. according to transient electromagnetic method pulse current radiating circuit according to claim 1, it is characterized in that, a switching device V
2, switching device V
3, switching device V
4, and switching device V
5upper anti-paralleled diode D respectively
2, diode D
3, diode D
4, diode D
5form H-bridge circuit, transmitting coil is sequentially connected in series diode D by one end
10, electric capacity C
3with diode D
13rear formation discharge loop, transmitting coil is sequentially connected in series diode D by the other end
11, electric capacity C
3with diode D
12rear formation discharge loop, with an electric capacity C after electric capacity C3 series connection energy regenerative constant voltage clamp circuit
1parallel connection, electric capacity C
1be connected in parallel on main power source.
5. according to transient electromagnetic method pulse current radiating circuit according to claim 4, it is characterized in that, energy regenerative constant voltage clamp circuit is the switch J be cascaded
1with resistance R
1, switch J
1upper anti-paralleled diode D
1.
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| CN201510579646.4A CN105119588B (en) | 2015-09-14 | 2015-09-14 | A kind of transient electromagnetic method pulse current radiating circuit |
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|---|---|---|---|
| CN201510579646.4A CN105119588B (en) | 2015-09-14 | 2015-09-14 | A kind of transient electromagnetic method pulse current radiating circuit |
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| CN105119588B CN105119588B (en) | 2017-09-26 |
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Cited By (7)
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| CN107017610A (en) * | 2017-05-11 | 2017-08-04 | 中国地质大学（武汉） | A kind of passive constant pressure clamper of Transient Electromagnetic Transmitter rapidly switches off circuit |
| CN108227011A (en) * | 2018-02-02 | 2018-06-29 | 吉林大学 | The double-trapezoidal wave emission system and control method of a kind of controllable failing edge |
| CN108337006A (en) * | 2018-02-05 | 2018-07-27 | 中国地质科学院地球物理地球化学勘查研究所 | A kind of aviation transient electromagnetic fado wave impulse radiating circuit |
| CN111123371A (en) * | 2019-12-26 | 2020-05-08 | 吉林大学 | High-quality emission waveform dragging type electromagnetic detection device and detection method |
| CN111965713A (en) * | 2020-07-15 | 2020-11-20 | 中国地质大学（武汉） | Passive constant voltage clamping transient electromagnetic transmitting circuit |
| CN112578466A (en) * | 2020-12-08 | 2021-03-30 | 重庆璀陆探测技术有限公司 | Energy-feedback type constant-voltage double-clamping circuit of transient electromagnetic transmitter and control method thereof |
| CN112764453A (en) * | 2020-10-30 | 2021-05-07 | 中国科学院长春光学精密机械与物理研究所 | Transient electromagnetic transmitting system based on PID algorithm and control method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107017610A (en) * | 2017-05-11 | 2017-08-04 | 中国地质大学（武汉） | A kind of passive constant pressure clamper of Transient Electromagnetic Transmitter rapidly switches off circuit |
| CN107017610B (en) * | 2017-05-11 | 2019-02-05 | 中国地质大学（武汉） | A kind of passive constant pressure clamper of Transient Electromagnetic Transmitter rapidly switches off circuit |
| CN108227011A (en) * | 2018-02-02 | 2018-06-29 | 吉林大学 | The double-trapezoidal wave emission system and control method of a kind of controllable failing edge |
| CN108337006A (en) * | 2018-02-05 | 2018-07-27 | 中国地质科学院地球物理地球化学勘查研究所 | A kind of aviation transient electromagnetic fado wave impulse radiating circuit |
| CN108337006B (en) * | 2018-02-05 | 2020-08-07 | 中国地质科学院地球物理地球化学勘查研究所 | Aviation transient electromagnetic method multiwave pulse transmitting circuit |
| CN111123371A (en) * | 2019-12-26 | 2020-05-08 | 吉林大学 | High-quality emission waveform dragging type electromagnetic detection device and detection method |
| CN111965713A (en) * | 2020-07-15 | 2020-11-20 | 中国地质大学（武汉） | Passive constant voltage clamping transient electromagnetic transmitting circuit |
| CN112764453A (en) * | 2020-10-30 | 2021-05-07 | 中国科学院长春光学精密机械与物理研究所 | Transient electromagnetic transmitting system based on PID algorithm and control method thereof |
| CN112578466A (en) * | 2020-12-08 | 2021-03-30 | 重庆璀陆探测技术有限公司 | Energy-feedback type constant-voltage double-clamping circuit of transient electromagnetic transmitter and control method thereof |
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