CN104393781B - Frequency domain electrical prospecting high voltage transmitter and control method thereof - Google Patents
Frequency domain electrical prospecting high voltage transmitter and control method thereof Download PDFInfo
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- CN104393781B CN104393781B CN201410675852.0A CN201410675852A CN104393781B CN 104393781 B CN104393781 B CN 104393781B CN 201410675852 A CN201410675852 A CN 201410675852A CN 104393781 B CN104393781 B CN 104393781B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
Abstract
The invention relates to a frequency domain electrical prospecting high voltage transmitter and control method thereof. The frequency domain electrical prospecting high voltage transmitter is composed by that a three-phase alternating current generator a is connected with the anode of a ground load via an isolated direct current regulated power supply I and a high voltage inverter bridge; a three-phase alternating current generator c is connected with the cathode of the ground load via an isolated direct current regulated power supply III and the high voltage inverter bridge; a three-phase alternating current generator b is connected with the cathode of the isolated direct current regulated power supply I via the anode of the isolated direct current regulated power supply II; the cathode of the isolated direct current regulated power supply II is connected with the anode of the isolated direct current regulated power supply III; and the high voltage inverter bridge is connected with a main control unit. Compared with the prior art, the frequency domain electrical prospecting high voltage transmitter uses low voltage withstanding small-power devices to achieve the high-voltage large power output; compared with the two-level output of the prior art, the dv/dt is lower; the insulation impulse and electromagnetic interference are reduced; and the frequency domain electrical prospecting high voltage transmitter has the advantages that the number of power devices is small, the control method is simple and convenient, and the problem of capacitor voltage sharing does not exist. Additionally, the wiring complexity is low, the failure rate is low, and the credibility is high, thereby meeting the requirement of field application.
Description
Technical field：
The present invention relates to the electrical prospecting discharger in a kind of geophysical exploration and control method, it is particularly suited for sending out
Penetrate the frequency domain high-power transmitting occasion of high power pulse square-wave signal.
Background technology：
In geophysical exploration, artificial source's frequency domain electro-prospecting detection instrument is made up of with receiver two parts transmitter.
Transmitter is used for thering is the periodic bipolar square wave signal of different frequency to search coverage transmitting, as electrical survey (-ing) can
Control artificial field source.Receiver gathers and records corresponding electromagnetic response data, by the Data Analysis Services collecting, finally
Realize the inversion interpretation of target area geology structure.During above-mentioned electrical prospecting, improve the output voltage of discharger,
The transmission power of transmitter can be improved, strengthen nagneto-telluric field response signal, improve the signal to noise ratio that receiver gathers signal, increase
The resolution of detection instrument and investigation depth.
Fig. 9 is existing H bridge inversion bridge schematic diagram, and existing artificial field source generally adopts single-stage DC source cascaded H bridge
Launching ambipolar pulse square wave signal, H bridge is typically from high-voltage high-speed power electronic devices IGBT as opening for inverter structure
Close device, the electric pressure generally selecting IGBT is 1200V or 1700V.
In practical application, in order to ensure that power electronic devices has safe and reliable working range, IGBT stress levels
Choose be generally DC bus-bar voltage 2～3 times.Nowadays also there is 3.3kV, the high pressure IGBT of 4.5kV, 6.5kV is although select more
The IGBT of high withstand voltage grade can reach high-voltage inverted purpose, but the limit of the self structure due to IGBT and technological level
System, compared with the corresponding high conduction losses of the IGBT of high withstand voltage and switching loss.Higher thermal losses will also result in more complicated simultaneously
Heat dissipation problem, will increase volume and the weight of instrument and equipment using larger heat abstractor, and field studies be caused greatly be stranded
Difficult.Meanwhile, the higher cost of the IGBT correspondence of high withstand voltage grade.Further, since above-mentioned IGBT constant power power electronic devices
Limit, cause the prime D.C. regulated power supply difficult design of H bridge inversion bridge.These reasons lead to using traditional single-stage direct current
The transmitter that power supply is combined with the bridge inversion of single-stage H is difficult to the purpose of high-power output.
A kind of conventional solution is to improve emitting voltage grade from low-voltage-grade IGBT series system at present.
Directly IGBT series connection application is needed it is entered Mobile state and static state voltage equipoise, the switching speed of IGBT comparatively fast makes equalizer circuit become
Complexity, meanwhile, the equalizer circuit of interpolation also will result in loss and rises, and leads to efficiency to decline.
Additionally, multi-level inverse conversion technology is passed through to improve the achievable high-power output of itself topological structure, many level are inverse
Become device and approach sine wave by producing Cycle-symmetry stepped square wave, be widely used in power system and large-size machine drives
Dynamic.Basic Topological is divided into diode hoop bit-type, electric capacity hoop bit-type and three kinds of cascade connection type.Under identical electric pressure, Tu10Wei
Diode hoop bit-type multi-level inverse conversion bridge schematic diagram, its hoop position diode needing and switching tube number are more, high cost；Directly
There is voltage-sharing in stream bus end input bulky capacitor, equalizer circuit and Pressure and Control are complicated.Figure 11 is the many level of electric capacity hoop bit-type
Inversion bridge schematic diagram, because it uses electric capacity number many, electric capacity volume is big, poor reliability, high cost and each electric capacity needs all
Pressure, leads to study less, shortage Practical significance at present.Figure 12 is cascading multiple electrical level inversion bridge schematic diagram, and it adopts module
The method of unit series connection, each block coupled in series unit includes transmitting bridge and isolation regulated power supply.Generally cascaded inverter pair
Gang mould module units at different levels are independently controlled, and lead to wiring various, are easily disturbed by extraneous factor.Particularly when a certain cascade module
There is driving malfunction (drive and lost efficacy, no drive signal) in unit, trouble unit busbar voltage will be changed into other concatenation unit electricity
The summation of pressure, causing trouble unit bridge front end direct current regulated power supply damages because of outfan high pressure.Above reason causes cascade
Type emission system stability declines, and fault rate improves, and indirectly reduces field construction efficiency, increased exploration cost.
In control method, traditional multi-electrical level inverter is using complicated control method it is therefore an objective to make output sinusoidal
Waveform has more low distortion harmonic rate.And in electrical prospecting field, output waveform is not required for sine wave, it is actually needed
Be fundamental frequency square-wave pulse signal, so the control method of traditional multi-electrical level inverter is not particularly suited for electrical prospecting.
CN101634719A proposes a kind of inverter for outputting cascade high voltage being applied to electrical prospecting, and this device is adopted
Use tandem type modular unit, every one-level is adopted low voltage designs, then multi-level unit series connection, because busbar voltage is levels at different levels
The summation of connection supply voltage, therefore achieve the purpose of high voltage output.But, because, in control method, bridges at different levels adopt
Synchronized signal controls, and output voltage is the bipolar square wave of two level, under the conditions of identical DC bus-bar voltage, than
Multi-level inverse conversion device, this inverter will produce larger dv/dt in the course of the work, causes serious electromagnetic interference problem
Higher insulating requirements.Meanwhile, need gang mould module units at different levels are independently controlled, wiring is various.The most fatal is：
When a certain cascade module unit occurs driving malfunction (drive and lost efficacy, no drive signal), trouble unit busbar voltage will be changed into
The summation of other concatenation unit voltages, causing trouble unit bridge front end direct current regulated power supply damages because of outfan high pressure.
Content of the invention：
The purpose of the present invention is aiming at the deficiency of above-mentioned technology, provides a kind of frequency domain electro-prospecting exploration high pressure transmitting dress
Put.
It is a further object of the present invention to provide a kind of frequency domain electro-prospecting explores the control method of high pressure discharger.
The purpose of the present invention is achieved through the following technical solutions：
A kind of frequency domain electro-prospecting explores high pressure discharger, is through isolated DC regulated power supply by threephase alternator a1
I 4 and high-voltage inverted bridge 7 be connected with the positive pole of earth load 9, threephase alternator c3 is through isolated DC regulated power supply III 6
It is connected with the negative pole of earth load 9 with high-voltage inverted bridge 7, threephase alternator b2 is through isolated DC regulated power supply II 5
Positive pole is connected with the negative pole of isolated DC regulated power supply I 4, and the negative pole of isolated DC regulated power supply II 5 is electric with isolated DC voltage stabilizing
Source III 6 positive pole connects, and high-voltage inverted bridge 7 and main control unit 8 connect and compose.
Main control unit 8 be by voltage transformer, current transformer and critesistor respectively through fault detect and transformator every
From driving I connection, the latched device of reset key is connected with malfunction coefficient, and human-computer interaction interface is through microprocessor, optical coupling isolation circuit
AND OR NOT gate circuit connects, and OR-NOT circuit output is divided into two-way, and a road connects dead-zone circuit, and another road connects delay circuit,
Dead-zone circuit drives 1 to be connected with driving parallel port through transformer isolation, and delay circuit drives 2 with driving parallel port even through transformer isolation
Connect composition.
Described transformer isolation drives 1 respectively to VT11、VT42、VT22、VT31Collector and emitter between voltage
VCECarry out signal detection, work as VT11、VT42、VT22、VT31In any one switching tube VCEWhen exceeding setting protection threshold values, immediately
The drive signal of respective switch pipe is set low, all sets low controlling drive signal A and B；For VT12、VT41、VT21、VT32, all not
Voltage V between detection collector and emitterCE, switching tube VT12Drive signal Drive12With switching tube VT41Drive signal
Drive41Only it is controlled by drive signal A, switching tube VT21Drive signal Drive21With switching tube VT32Drive signal Drive32Only
It is controlled by drive signal B；When there is overvoltage, excessively stream, overheating fault, all set low controlling drive signal A and B.
High-voltage inverted bridge 7 is by three electric capacity C1、C2And C3, four diode D1、D2、D3And D4, eight switching tube VT11、
VT12、VT21、VT22、VT31、VT32、VT41And VT42Constitute；Electric capacity C1Positive pole be connected with HH end, electric capacity C1Negative pole and HL end
Connect, electric capacity C2Positive pole be connected with HL end, electric capacity C2Negative pole be connected with LH end, electric capacity C3Positive pole be connected with LH end, electric capacity
C2Negative pole be connected with LL end；VT11Colelctor electrode be connected with HH end, VT11Emitter stage and VT12Colelctor electrode connect, VT12's
Emitter stage and VT21Colelctor electrode and outfan OUTA connect, VT21Emitter stage and VT22Colelctor electrode connect, VT22Emitter stage
It is connected with LL end, VT31Colelctor electrode be connected with HH end, VT31Emitter stage and VT32Colelctor electrode connect, VT32Emitter stage with
VT41Colelctor electrode and outfan OUTB connect, VT41Emitter stage and VT42Colelctor electrode connect, VT42Emitter stage and LL end even
Connect；D1Anode be connected with LH end, D1Negative electrode and VT12Colelctor electrode connect, D2Anode and VT21Emitter stage connect, D2's
Negative electrode is connected with HL end, D3Anode be connected with LH end, D3Negative electrode and VT32Colelctor electrode connect, D4Anode and VT41Send out
Emitter-base bandgap grading connects, D4Negative electrode connect and compose with HL end.
Frequency domain electro-prospecting explores the control method of high pressure discharger：
Two-way drive control signal A anti-phase each other and B are exported by main control unit 8, by the rising edge time delay Δ of signal A
t1, obtain signal DAOUT,DAOUTForm drive signal D after isolation processingrive11And Drive42, Drive11And Drive42It is respectively used to
Control VT11And VT42, by the rising edge of signal A and trailing edge time delay Δ t respectively2With Δ t3, obtain signal DAIN,DAINThrough isolation
Form drive signal D after processrive12And Drive41, Drive12And Drive41It is respectively used to control VT12And VT41, signal B is upper
Rise along time delay Δ t1, obtain signal DBOUT,DBOUTForm drive signal D after isolation processingrive22And Drive31, Drive22With
Drive31It is respectively used to control VT22And VT31, by the rising edge of signal B and trailing edge time delay Δ t respectively2With Δ t3, obtain signal
DBIN,DBINForm drive signal D after isolation processingrive21And Drive32, Drive21And Drive32It is respectively used to control VT21With
VT32；Δt1>Δt2>Δt3；Switching tube VT in a cycle11、VT12、VT21、VT22、VT31、VT32、VT41And VT42Turn-on sequence
For：
a.VT12、VT41Conducting, VT11、VT42、VT21、VT32、VT22、VT31Turn off,
b.VT12、VT41、VT11、VT42Conducting, VT21、VT32、VT22、VT31Turn off,
c.VT12、VT41Conducting, VT11、VT42、VT21、VT32、VT22、VT31Turn off,
d.VT12、VT41、VT11、VT42、VT21、VT32、VT22、VT31Turn off,
e.VT21、VT32Conducting, VT12、VT41、VT11、VT42、VT22、VT31Turn off,
f.VT21、VT32、VT22、VT31Conducting, VT12、VT41、VT11、VT42, turn off,
g.VT21、VT32Conducting, VT12、VT41、VT11、VT42、VT22、VT31Turn off,
h.VT12、VT41、VT11、VT42、VT21、VT32、VT22、VT31Turn off.
Beneficial effect：Compared with prior art, (1) should by the multi-level inverse conversion principle variation of existing sinewave output
Achieve high-voltage square-wave output for survey of the earth field, complete the mesh of high-power output with low pressure low-power device
's.(2) in the high-voltage inverted bridge half period, output voltage is three level changes, has relatively compared with existing two level outputs
Low dv/dt, reduces insulation impact and electromagnetic interference.(3) on the premise of identical input direct-current busbar voltage, there is power
Device count is low, the easy feature of control method.(4) HVDC side bus electric capacity adopts independent D.C. regulated power supply to supply
, there is not capacitor voltage equalizing problem in electricity.(5) main control unit can be by aviation plug through single shielded cable and high-voltage inverted bridge boat
Blind plug connects, and has that wiring complexity is low, the low advantage of fault rate, is suitable for using under complex environment in the wild.(6) take suitable
Drive control method for inversion topological structure and multiple protection method, have higher reliability, meet field studies need
Ask.(7) geophysicses such as controlled-source audiomagnetotellurics method, frequency-domain IP method and complex resistivity method can be applied to survey
Spy method.
Brief description：
Fig. 1 frequency domain electro-prospecting explores high pressure discharger structured flowchart
Diode hoop position high-voltage inverted bridge 7 structure chart in Fig. 2 Fig. 1
The structured flowchart of main control unit 8 in Fig. 3 Fig. 1
Fig. 4 drive control signal and bridge output waveform sequential chart
The high-voltage inverted bridge circuit turn-on state diagram of Fig. 5 diode hoop position
The conducting state figure that should avoid during the conducting of Fig. 6 high-voltage inverted bridge
The conducting state figure that Fig. 7 high-voltage inverted bridge should avoid when turning off
Circuit turn-on state diagram during Fig. 8 cascade connection type inversion bridge driving malfunction
Equal electric pressure tradition H bridge inversion bridge schematic diagram in Fig. 9 prior art
Equal electric pressure diode hoop bit-type inversion bridge schematic diagram in Figure 10 prior art
Equal electric pressure electric capacity hoop bit-type inversion bridge schematic diagram in Figure 11 prior art
Equal electric pressure cascade connection type inversion bridge schematic diagram in Figure 12 prior art
Specific embodiment：
Describe in detail as further with reference to the accompanying drawings and examples：
Fig. 1 show frequency domain electro-prospecting exploration high pressure discharger, is steady with isolated DC by threephase alternator a1
Voltage source I 4 connects, and threephase alternator b2 is connected with isolated DC regulated power supply II 5, threephase alternator c3 and isolation
D.C. regulated power supply III 6 connects, and isolated DC regulated power supply I 4 output cathode is connected with the HH end of high-voltage inverted bridge 7, isolation
D.C. regulated power supply I 4 output negative pole is connected with the HL end of isolated DC regulated power supply II 5 output cathode and high-voltage inverted bridge 7,
Isolated DC regulated power supply II 5 output negative pole and the LH end of isolated DC regulated power supply III 6 output cathode and high-voltage inverted bridge 7
Connect, isolated DC regulated power supply III 6 output negative pole is connected with the LL end of high-voltage inverted bridge 7, high-voltage inverted bridge 7 outfan
OUTA and OUTB is connected with earth load 9, and main control unit 8 is connected and composed with high-voltage inverted bridge 7, and main control unit 8 is protected by fault
Shield unit and drive control unit are constituted.
Threephase alternator a1, threephase alternator b2 and threephase alternator c3 are used for D.C. regulated power supply
I 4, D.C. regulated power supply II 5 and D.C. regulated power supply III 6 provide energy, D.C. regulated power supply I 4, D.C. regulated power supply II 5 and
III 6 couples of threephase alternator a1 of D.C. regulated power supply, threephase alternator b2 and the energy of threephase alternator c3 offer
The electric energy of voltage constant, after amount is processed, is provided to high-voltage inverted bridge 7.Isolated DC regulated power supply I 4, DC voltage-stabilizing electricity
Source II 5 and D.C. regulated power supply III 6 are connected in series and provide high input voltage for high-voltage inverted bridge 7.Main control unit 8 passes through aviation and inserts
Head is connected with high-voltage inverted bridge 7 aviation plug through single shielded cable, for controlling high-voltage inverted bridge 7 to earth load 9
Export ambipolar high-voltage square-wave pulse signal.Earth load 9 is connected with the earth at a distance of 1～3km ground electrode by two and constitutes,
Its reactance is in resistance sense, and usual equivalent inductance is 1mH～8mH, equivalent resistance 10～80 Ω.
It is illustrated in figure 2 high-voltage inverted bridge 7, be by three electric capacity C1、C2And C3, four diode D1、D2、D3And D4,
Eight switching tube VT11、VT12、VT21、VT22、VT31、VT32、VT41And VT42Constitute；Electric capacity C1Positive pole be connected with HH end, electric capacity
C1Negative pole be connected with HL end, electric capacity C2Positive pole be connected with HL end, electric capacity C2Negative pole be connected with LH end, electric capacity C3Positive pole
It is connected with LH end, electric capacity C2Negative pole be connected with LL end；VT11Colelctor electrode be connected with HH end, VT11Emitter stage and VT12Collection
Electrode connects, VT12Emitter stage and VT21Colelctor electrode and outfan OUTA connect, VT21Emitter stage and VT22Colelctor electrode even
Connect, VT22Emitter stage be connected with LL end, VT31Colelctor electrode be connected with HH end, VT31Emitter stage and VT32Colelctor electrode connect,
VT32Emitter stage and VT41Colelctor electrode and outfan OUTB connect, VT41Emitter stage and VT42Colelctor electrode connect, VT42's
Emitter stage is connected with LL end；D1Anode be connected with LH end, D1Negative electrode and VT12Colelctor electrode connect, D2Anode and VT21's
Emitter stage connects, D2Negative electrode be connected with HL end, D3Anode be connected with LH end, D3Negative electrode and VT32Colelctor electrode connect, D4
Anode and VT41Emitter stage connect, D4Negative electrode be connected with HL end.
Fig. 3 show main control unit 8, including error protection unit and two parts of drive control unit.Error protection list
Unit is by voltage transformer, and current transformer is connected with latch through failure detector circuit with critesistor, and reset key is latched
Device is connected and composed with fault display circuit.Voltage transformer is used for detecting input direct-current bus HH and LL of high-voltage inverted bridge 7
Between voltage, current transformer is used for detecting the electric current of the input direct-current bus HH of high-voltage inverted bridge 7, critesistor is arranged on
On the diffusion sheet that in high-voltage inverted bridge 7, IGBT is located, for detecting the temperature of fin.Failure detector circuit one side is used for
On current analog signal I and critesistor on voltage analog signal V on real-time detection voltage transformer, current transformer
Temperature analog signal T and transformer isolation drive the 4 tunnel driving malfunction logical signals that in 1,1. driving malfunction outfan is gone up
Derror1,2,3,4；On the other hand these signals are compared with the rotection thresholds of setting respectively, when one of these signals or several
During higher than the threshold value arranging, failure detector circuit output corresponding high level overvoltage logical signal Vo, excessively stream logical signal Io, mistake
Hot logical signal ToWith 4 tunnel driving malfunction logical signal Do1,2,3,4.The overvoltage that latch is used for exporting failure detector circuit is patrolled
Collect signal Vo, excessively stream logical signal Io, overheated logical signal ToWith 4 tunnel driving malfunction logical signal Do1,2,3,4Latched, output
Over-pressed logical signal Verr, excessively stream logical signal Ierr, overheated logical signal TerrWith 4 tunnel driving malfunction logical signal Derr1,2,3,4
And lump fault logic signals Eerr.Reset key is used for sending R to latchesSignal makes Latch output signal Verr, Ierr,
TerrWith 4 road Derr1,2,3,4And EerrReset to low level.Fault display circuit is made up of 7 LED lights, is respectively used to refer to
Show over-pressed logical signal Verr, excessively stream logical signal Ierr, overheated logical signal TerrWith 4 tunnel driving malfunction logical signals
Derr1,2,3,4.
Drive control unit is to be connected through microprocessor, optical coupling isolation circuit AND OR NOT gate circuit by human-computer interaction interface,
OR-NOT circuit output is divided into two-way, and a road connects dead-zone circuit, and another road connects delay circuit, dead-zone circuit through transformator every
From driving 1 to be connected with driving parallel port, delay circuit drives 2 to connect and compose with driving parallel port through transformer isolation.Error protection list
The connected mode of unit and drive control unit is the OR-NOT circuit of the latch by error protection unit and drive control unit
Connect, the transformer isolation of drive control unit drives the 1 driving malfunction outfan 1. fault detect with error protection unit
Circuit is connected to form.Human-computer interaction interface is made up of with button LCDs, launches frequency for artificial setting transmitter
Rate.Microprocessor is used for the frequency order of artificial setting is converted to drive control signal A and the B of two-way respective frequencies.Optocoupler
Isolation circuit is used for isolating microprocessor with rear class modulate circuit, and drive control signal A and B export after optic coupling element isolation
Drive signalWith WithIt is respectively the antilogical of A and B.The collection total failare that OR-NOT circuit is used for exporting latch is patrolled
Collect signal EerrRespectively with drive signalWithCarry out NOR-logic computing, export output drive signal DAAnd DB.Dead-zone circuit
For arranging drive signal DAAnd DBRising edge time delay.Delay circuit is used for arranging drive signal DAAnd DBRising edge and under
Fall is along time delay.Transformer isolation drives 1 to be made up of 4 tunnel transformer isolation drive circuits and 4 tunnel driving malfunction testing circuits, transformation
Device isolated drive circuit is used for for drive control logical signal being changed into the drive signal that can directly drive IGBT, and 4 roads drive
Failure detector circuit is respectively used to VT11、VT42、VT22、VT31Collector and emitter between voltage VCECarry out signal inspection
Survey, work as VT11、VT42、VT22、VT31In any one switching tube VCEWhen exceeding setting protection threshold values, immediately by respective switch pipe
Drive signal set low, by control drive signal A and B all set low, driving malfunction outfan will export logic high simultaneously, become
During depressor isolated drive circuit normal work, driving malfunction outfan exports low level.Transformer isolation drives 2 only to be become by 4 tunnels
Depressor isolated drive circuit is constituted, without driving malfunction testing circuit, no driving malfunction outfan.
The wiring of main control unit 8 internal drive parallel port and sensor is through single shielded cable and high pressure by aviation plug
Inversion bridge aviation plug connects.
Frequency domain electro-prospecting explores the control method of high pressure discharger, including:
Two-way drive control signal A anti-phase each other and B are exported by main control unit 8, by the rising edge time delay Δ of signal A
t1, obtain signal DAOUT,DAOUTForm drive signal D after isolation processingrive11And Drive42, Drive11And Drive42It is respectively used to
Control VT11And VT42, by the rising edge of signal A and trailing edge time delay Δ t respectively2With Δ t3, obtain signal DAIN,DAINThrough isolation
Form drive signal D after processrive12And Drive41, Drive12And Drive41It is respectively used to control VT12And VT41, signal B is upper
Rise along time delay Δ t1, obtain signal DBOUT,DBOUTForm drive signal D after isolation processingrive22And Drive31, Drive22With
Drive31It is respectively used to control VT22And VT31, by the rising edge of signal B and trailing edge time delay Δ t respectively2With Δ t3, obtain signal
DBIN,DBINForm drive signal D after isolation processingrive21And Drive32, Drive21And Drive32It is respectively used to control VT21With
VT32；Δt1>Δt2>Δt3；Switching tube VT in a cycle11、VT12、VT21、VT22、VT31、VT32、VT41And VT42Turn-on sequence
For：
a.VT12、VT41Conducting, VT11、VT42、VT21、VT32、VT22、VT31Turn off,
b.VT12、VT41、VT11、VT42Conducting, VT21、VT32、VT22、VT31Turn off,
c.VT12、VT41Conducting, VT11、VT42、VT21、VT32、VT22、VT31Turn off,
d.VT12、VT41、VT11、VT42、VT21、VT32、VT22、VT31Turn off,
e.VT21、VT32Conducting, VT12、VT41、VT11、VT42、VT22、VT31Turn off,
f.VT21、VT32、VT22、VT31Conducting, VT12、VT41、VT11、VT42, turn off,
g.VT21、VT32Conducting, VT12、VT41、VT11、VT42、VT22、VT31Turn off,
h.VT12、VT41、VT11、VT42、VT21、VT32、VT22、VT31Turn off.
Frequency domain electro-prospecting explores the control method of high pressure discharger, also includes：
Respectively to VT11、VT42、VT22、VT31Collector and emitter between voltage VCECarry out signal detection, work as VT11、
VT42、VT22、VT31In any one switching tube VCEWhen exceeding setting protection threshold values, immediately by the drive signal of respective switch pipe
Set low, all set low controlling drive signal A and B；For VT12、VT41、VT21、VT32, all do not detect between collector and emitter
Voltage VCE, switching tube VT12Drive signal Drive12With switching tube VT41Drive signal Drive41Only it is controlled by drive signal A,
Switching tube VT21Drive signal Drive21With switching tube VT32Drive signal Drive32Only it is controlled by drive signal B；When occurring
When pressure, excessively stream, overheating fault, all set low controlling drive signal A and B.
Make a concrete analysis of the control method that frequency domain electro-prospecting explores high pressure discharger with reference to Fig. 3.
1) microprocessor within main control unit 8 receives the waveform instruction of human-computer interaction interface input, and microprocessor is sent out
Go out two-way logical signal A and B anti-phase each other, logical signal A and B is through the anti-phase logical signal of optical coupling isolation circuit outputWith
2) the voltage analog letter on the failure detector circuit one side real-time detection voltage transformer within main control unit 8
The temperature analog signal T on current analog signal I and critesistor on number V, current transformer and transformer isolation drive 1
The 4 tunnel driving malfunction logical signal D that 1. middle driving malfunction outfan is gone uperror1,2,3,4；On the other hand by these signals respectively with advance
The fault reference signal put compares, when these signals are higher than fault reference signal, failure detector circuit output high electricity accordingly
Flat overvoltage logical signal Vo, excessively stream logical signal Io, overheated logical signal ToWith 4 tunnel driving malfunction logical signal Do1,2,3,4.High electricity
Flat over-pressed logical signal Vo, excessively stream logical signal Io, overheated logical signal ToWith 4 tunnel driving malfunction logical signal Do1,2,3,4Warp
Latches export the fault logic signals V of high levelerr, Ierr, TerrAnd Derr1,2,3,4Indicate event for fault display circuit
Barrier, the lump fault logic signals E of latch output simultaneouslyerrThe OR-NOT circuit of supply drive control unit, the high electricity of above-mentioned signal
Flat effective, when original state and latch reset state, export lump fault-signal EerrFor low level.
3) optical coupling isolation circuit output logic signalWithRespectively with lump fault logic signals EerrCommon input or non-
Gate circuit, obtains output drive signalWherein "+", "-" represents logical operationss respectively
In "or", NOT operation.Work as EerrDuring for high level, DA, DBFor low level, it is invalid to drive；Work as EerrDuring for low level, DA, DB
With drive signal A, B is consistent, drives effectively, thus reaching the purpose of error protection.
4) output drive signal DAAnd DBProduce rising edge time delay Δ t through dead-zone circuit respectively1Signal DAOUTAnd DBOUT,
DAOUTAnd DBOUTFor driving the outside 4 switching tube VT in high-voltage inverted bridge (7)11, VT22, VT31And VT42, by DAOUTThrough becoming
Depressor isolation drive 1 exports IGBT gate drive signal Drive11, Drive42For driving VT11And VT42Conducting and shutoff, by DBOUT
Drive 1 output IGBT gate drive signal D through transformer isolationrive31, Drive22For driving VT31And VT22Conducting and shutoff.
5) output drive signal DAAnd DBProduce rising edge time delay Δ t through delay circuit respectively2Decline time delay Δ t3Signal
DAIN, DBINFor driving the inside 4 switching tube VT in high-voltage inverted bridge 712, VT21, VT32And VT41, by DAINThrough transformator
Isolation drive 2 exports IGBT gate drive signal Drive12, Drive41For driving VT12And VT41Conducting and shutoff, by DBINThrough becoming
Depressor isolation drive 2 exports IGBT gate drive signal Drive21, Drive32For driving VT21And VT32Conducting and shutoff.
Delay time Δ t1、Δt2With Δ t3Selection by emission maximum frequency fmaxAnd " internal switch pipe first turns on, outside
Turn on after switching tube；External switch pipe is first turned off, after internal switch pipe turn off " Controlling principle determine.Need：Δt1>Δt2>
Δt3>0s, Δ t1<1/(2×fmax).
High with bridge output waveform sequential chart and diode hoop position shown in Fig. 5 with reference to drive control signal shown in Fig. 4
High-voltage inverted bridge 7 circuit turn-on state is made a concrete analysis of in pressure inversion bridge circuit turn-on state diagram.Symbol VT in the description belowxx
(D) represent the anti-paralleled diode of IGBT.In actual applications, because earth load induction reactance is big and drives dead band time delay short,
High-voltage inverted bridge 8 is usually operated at the continuous pattern of output current.
It is assumed that t0Moment is upper electricity initial time, t0Moment drive signal DAFor high level, DBFor low electricity
Flat, IGBT gate drive signal Drive11, Drive42, Drive22, Drive31, Drive12, Drive41, Drive21And Drive32It is all low electricity
Flat.
In t0～t1Period, due to IGBT gate drive signal Drive11, Drive42, Drive22, Drive31, Drive12, Drive41,
Drive21And Drive32, all for low level, therefore high-voltage inverted bridge 7 no turns on loop, bridge output voltage voFor 0V；
Signal DAThrough delay circuit rising edge time delay Δ t2Reach t afterwards1Moment, now drive signal Drive12, Drive41By low
Level conversion is high level, IGBT switching tube VT12And VT41Conducting, rest switch pipe is in off state, therefore no turns on back
Road, bridge output voltage voFor 0V, in t1～t2Period, circuit turn-on state is as shown in Figure 5 a；
Signal DAThrough dead-zone circuit rising edge time delay Δ t1Afterwards, reach t2Moment, now drive signal Drive11, Drive42By
Low transition is high level, IGBT switching tube VT11And VT42Conducting, now conducting loop is C1→VT11→VT12→ load →
VT41→VT42→C3→C2→C1, bridge output voltage voFor+3E, in t2～t3Period, circuit turn-on state is as shown in Figure 5 b；
In t3Moment, signal DALow level is converted to by high level, now drive signal Drive11, Drive42Turned by high level
It is changed to low level, IGBT switching tube VT11And VT42Turn off, now conducting loop is C2→D1→VT12→ load → VT41→D4→
C2, bridge output voltage voFor-E, in t3～t4Period, circuit turn-on state is as shown in Figure 5 c；
Signal DAThrough delay circuit trailing edge time delay Δ t3Reach t afterwards4Moment, now drive signal Drive12, Drive41By height
Level conversion is low level, IGBT switching tube VT12And VT41Turn off, now conducting loop is C3→VT22(D)→VT21(D) → negative
Load → VT32(D)→VT31(D)→C1→C2→C3, bridge output voltage voFor -3E, in t4～t5Period, circuit turn-on state is such as
Shown in Fig. 5 d；
Signal DBThrough delay circuit rising edge time delay Δ t2Reach t afterwards5Moment, now drive signal Drive21, Drive32By low
Level conversion is high level, IGBT switching tube VT21And VT32Conducting, now conducting loop is C3→VT22(D)→VT21(D) → negative
Load → VT32(D)→VT31(D)→C1→C2→C3, bridge output voltage voFor -3E, in t5～t6Period, circuit turn-on state is such as
Shown in Fig. 5 e；
Signal DBThrough dead-zone circuit rising edge time delay Δ t1Reach t afterwards6Moment, now drive signal Drive22, Drive31By low
Level conversion is high level, IGBT switching tube VT22And VT31Conducting, now conducting loop is C3→VT22(D)→VT21(D) → negative
Load → VT32(D)→VT31(D)→C1→C2→C3, bridge output voltage voFor -3E, in t6～t7Period, circuit turn-on state is such as
Shown in Fig. 5 f；
In t7In the moment, load inductance afterflow finishes, and load current starts reverse circulated, and now conducting loop is C1→VT31
→VT32→ load → VT21→VT22→C3→C2→C1, bridge output voltage voFor -3E, in t7～t8Period, circuit turn-on shape
State is as shown in fig. 5g；
In t8Moment, signal DBLow level is converted to by high level, now drive signal Drive22, Drive31Turned by high level
It is changed to low level, IGBT switching tube VT22And VT31Turn off, now conducting loop is C2→D3→VT32→ load → VT21→D2→
C2, bridge output voltage voFor+E, in t8～t9Period, circuit turn-on state is as shown in figure 5h；
Signal DBThrough delay circuit trailing edge time delay Δ t3Afterwards, in t9Moment, now drive signal Drive21, Drive32By height
Level conversion is low level, IGBT switching tube VT21And VT32Turn off, now conducting loop is C1→C2→C3→VT42(D)→VT41
(D) → load → VT12(D)→VT11(D)→C1, bridge output voltage voFor+3E, in t9～t10Period, circuit turn-on state is such as
Shown in Fig. 5 i；
Signal DAThrough delay circuit rising edge time delay Δ t2Afterwards, in t10Moment, now drive signal Drive12, Drive41By low
Level conversion is high level, IGBT switching tube VT12And VT41Conducting, now conducting loop is C1→C2→C3→VT42(D)→VT41
(D) → load → VT12(D)→VT11(D)→C1, bridge output voltage voFor+3E, in t10～t11Period, circuit turn-on state
As shown in figure 5j；
Signal DAThrough dead-zone circuit rising edge time delay Δ t1Afterwards, in t11Moment, now drive signal Drive11, Drive42By low
Level conversion is high level, IGBT switching tube VT11And VT42Conducting, now conducting loop is C1→C2→C3→VT42(D)→VT41
(D) → load → VT12(D)→VT11(D)→C1, bridge output voltage voFor+3E, in t11～t12Period, circuit turn-on state
As shown in figure 5k；
In t12In the moment, load inductance afterflow finishes, and load current starts reverse circulated, and now conducting loop is C1→VT11
→VT12→ load → VT41→VT42→C3→C2→C1, bridge output voltage voFor+3E, in t12～t13Period, circuit turn-on shape
State is as shown in Fig. 5 l；
From t13Repetition t from moment3Moment working method, shown in Fig. 5 l, state is consistent with Fig. 5 b, shows that Fig. 5 b～Fig. 5 k is
Circuit turn-on circuit cycle figure during normal work.
In above-mentioned bridge work process, the current work on earth load 9 under continuous pattern, high-voltage inverted bridge 7
Output voltage VoChange in a cycle turns to+3E →-E → -3E →+E →+3E, under identical bus input voltage, high
The three level steps changes within the half period of pressure inversion bridge 7 have lower dv/ with respect to traditional H bridge two level output
Dt, contributes to reducing insulation impact and electromagnetic interference.
In high-voltage inverted bridge 7 work process, in conjunction with Fig. 5 analysis can obtain, in high-voltage inverted bridge 7 each switching tube and
The pressure 2E of maximum that power diode is born in a cycle is the 2/3 of input direct-current busbar voltage 3E it is achieved that with low
The power power electronic device of stress levels completes the purpose of High voltage output.And traditional H bridge inverter, every in bridge
The voltage that power switch pipe is born is input direct-current busbar voltage 3E although selecting the power power electronics of more high withstand voltage grade
Device (as IGBT, MOSFET, diode) can reach high-voltage inverted purpose, but due to power power electronic device from
Body structure and the restriction of technological level, compared with the corresponding high conduction losses of the power power electronic device of high withstand voltage and switching loss.
Higher thermal losses will also result in more complicated heat dissipation problem simultaneously, will increase the body of instrument and equipment using larger heat abstractor
Amass and weight, field studies are caused with great difficulty.Meanwhile, the power power electronic device correspondence of high withstand voltage grade is higher
Cost, particularly with the power power electronic device needing greater number in high-power discharger structure, Cost Problems are particularly
Seriously.So loss, reduces cost can be reduced with the power power electronic device of low stress levels.
Using control method high-voltage inverted bridge 7 can be made to avoid the conducting state shown in Fig. 6 and Fig. 7.In Fig. 6 and Tu
Under working condition shown in 7, the voltage that switching tube bears can reach+3E, does not reach the power power electronics device of use+2E stress levels
Part realizes the purpose of+3E High voltage output.
In conjunction with the conducting state that should avoid during Fig. 6 analysis high-voltage inverted bridge conducting.What hypothesis initial time first turned on opens
Closing pipe is VT11And VT42, then just make VT12And VT41Conducting.Then switching tube VT11And VT42During conducting as shown in Figure 6 a；In VT12
And VT41During conducting, due to the difference of the individual manufacturing process of switching tube, lead to ON time and the pass of each switching tube
The disconnected time is all not quite similar, VT12And VT41Will not simultaneously turn on it is assumed that VT41First turn on, VT12Not yet turn on, as shown in Figure 6 b,
Now, switching tube VT12Whole busbar voltages 3E will be born before conducting in two ends, cause VT12Damage because of high-voltage breakdown.
The conducting state that should avoid when turning off in conjunction with the high-voltage inverted bridge of Fig. 7 analysis.What hypothesis initial time was first turned off opens
Closing pipe is VT11And VT42, then just make VT12And VT41Turn off.Then initial time switching tube VT11, VT12, VT41And VT42During conducting
As shown in Figure 7a；In VT12And VT41During shutoff, due to the difference of the individual manufacturing process of switching tube, VT12And VT41No
Can simultaneously turn off it is assumed that VT12It is first turned off, VT41Not yet turn off, as shown in Figure 7b, now, conducting loop is VT22(D)→VT21
(D) → load → VT41→VT42→VT22(D), switching tube VT12Two ends will bear whole busbar voltages 3E after shut-off, cause
Make VT12Damage because of high-voltage breakdown.
Therefore, in control method proposed by the invention, in conducting using " internal switch pipe first turns on, and outside is opened
The control method of conducting after the pipe of pass ", adopts the controlling party of " turning off after internal switch pipe, external switch pipe is first turned off " when off
Method, is so avoided that the conducting state shown in Fig. 6 and Fig. 7, make switching tube pressure at any time all less than+2E.Internal
Switching tube refers to VT12、VT21、VT32And VT41, external switch pipe refers to VT11、VT22、VT31And VT42.
As shown in Figure 10, Figure 11 and Figure 12, Figure 10 is equal voltage etc. in prior art to existing multi-level inverse conversion bridge
Level diode hoop bit-type inversion bridge schematic diagram, Figure 11 is that in prior art, equal electric pressure electric capacity hoop bit-type inversion bridge is shown
It is intended to, Figure 12 is equal electric pressure cascade connection type inversion bridge schematic diagram in prior art.In existing multi-level inverse conversion bridge
In, to make output produce more level number, the complicated control method of cooperation by using more power device, output can be made
Approach sine-shaped staircase waveform, there is more low distortion harmonic rate.This use multi-level inverse conversion bridge output just approaches
The method of the staircase waveform of string waveform is widely used in power system and big Motor drive.And in geophysical exploration, real
It is desirable that fundamental frequency square-wave pulse signal, frequency domain electro-prospecting explores discharger does not need output waveform to have more electricity on border
Flat number, only need to control transmitter transmitting square-wave pulse signal.So on the premise of identical input direct-current busbar voltage,
, compared with existing multi-level inverse conversion bridge, it is low to have a power device number, control method for high-voltage inverted bridge 7 shown in Fig. 2
Easy feature.
High-voltage inverted bridge 7 shown in Fig. 2 is in electric capacity C1、C2And C3The each independent isolated DC in parallel in two ends steady
Voltage source, solves the problems, such as traditional multi-level inversion bridge capacitor voltage equalizing.
In the bridge of cascade connection type inversion shown in Figure 12, typically adopt modular method for designing, that is, adopt modular unit to connect
Method, each serial module structure unit include transmitting bridge and isolation regulated power supply.Cascaded inverter need to be to each cascade module
Unit carries out independent wiring and controls, and leads to wiring various, is easily disturbed by extraneous factor.Particularly when a certain cascade module unit
There is driving malfunction (drive and lost efficacy, no drive signal), it will lead to the turn on process of strong damaging.As shown in Figure 8 it is assumed that
There is driving malfunction in the first order modular unit on top, other two-rank module unit output voltage summations will be added in malfunctioning module list
First outfan, i.e. fault terminal voltage E1=E2+E3, causing trouble modular unit bridge front end direct current regulated power supply is because of outfan height
Press and damage.In the present invention, the wiring of main control unit 8 internal drive parallel port and sensor is through single screen by aviation plug
Cover cable to be connected with high-voltage inverted bridge aviation plug, if occur no the fault of drive signal when, high-voltage inverted bridge 7 not work
Make, above-mentioned over-voltage fault situation will not occur.Therefore have compared with cascade connection type inversion bridge that wiring complexity is low, fault rate is low,
The advantage using under suitable complex environment in the wild.
Claims (4)
1. a kind of frequency domain electro-prospecting exploration high pressure discharger is it is characterised in that by threephase alternator a (1) and isolate straight
Stream regulated power supply I (4) connects, and threephase alternator b (2) is connected with isolated DC regulated power supply II (5), three phase AC power generating
Machine c (3) is connected with isolated DC regulated power supply III (6), isolated DC regulated power supply II (5) output cathode and isolated DC voltage stabilizing
The connection of power supply I (4) output negative pole HL end, isolated DC regulated power supply II (5) output negative pole and isolated DC regulated power supply III (6)
The connection of output cathode LH end, isolated DC regulated power supply I (4) output cathode HH end and negative pole HL end and isolated DC regulated power supply
Totally 4 terminals are all connected with the direct-flow input end of high-voltage inverted bridge (7) for III (6) output cathode LH end and negative pole LL end, high pressure
The ac output end OUTA of inversion bridge (7) is connected with the positive pole of earth load (9), the exchange output of high-voltage inverted bridge (7)
End OUTB is connected with the negative pole of earth load (9)；
Described high-voltage inverted bridge (7) is by three electric capacity C1、C2And C3, four diode D1、D2、D3And D4, eight switching tubes
VT11、VT12、VT21、VT22、VT31、VT32、VT41And VT42Constitute；Electric capacity C1Positive pole be connected with HH end, electric capacity C1Negative pole with
HL end connects, electric capacity C2Positive pole be connected with HL end, electric capacity C2Negative pole be connected with LH end, electric capacity C3Positive pole be connected with LH end,
Electric capacity C3Negative pole be connected with LL end；Switching tube VT11Colelctor electrode be connected with HH end, switching tube VT11Emitter stage and switching tube
VT12Colelctor electrode connect, switching tube VT12Emitter stage and switching tube VT21Colelctor electrode and outfan OUTA connect, switching tube
VT21Emitter stage and switching tube VT22Colelctor electrode connect, switching tube VT22Emitter stage be connected with LL end, switching tube VT31Collection
Electrode is connected with HH end, switching tube VT31Emitter stage and switching tube VT32Colelctor electrode connect, switching tube VT32Emitter stage with
Switching tube VT41Colelctor electrode and outfan OUTB connect, switching tube VT41Emitter stage and switching tube VT42Colelctor electrode connect,
Switching tube VT42Emitter stage be connected with LL end；D1Anode be connected with LH end, D1Negative electrode and switching tube VT12Colelctor electrode even
Connect, D2Anode and switching tube VT21Emitter stage connect, D2Negative electrode be connected with HL end, D3Anode be connected with LH end, D3's
Negative electrode and VT32Colelctor electrode connect, D4Anode and switching tube VT41Emitter stage connect, D4Negative electrode connect and compose with HL end.
2. according to the frequency domain electro-prospecting exploration high pressure discharger described in claim 1 it is characterised in that main control unit (8) is
Connected through fault detect and latch AND OR NOT gate circuit respectively by voltage transformer, current transformer and critesistor, reset
The latched device of key is connected with malfunction coefficient, and human-computer interaction interface connects through microprocessor, optical coupling isolation circuit AND OR NOT gate circuit,
OR-NOT circuit output is divided into two-way, and a road connects dead-zone circuit, and another road connects delay circuit, dead-zone circuit through transformator every
From driving I to be connected with driving parallel port, delay circuit drives II to be connected with driving parallel port through transformer isolation, and transformer isolation drives
I is connected and composed with fault detect.
3. explore high pressure discharger according to the frequency domain electro-prospecting described in claim 2 it is characterised in that described transformator every
From driving I switch tube VT respectively11、VT42、VT22、VT31Collector and emitter between voltage VCECarry out signal detection, when
Switching tube VT11、VT42、VT22、VT31In any one switching tube VCEWhen exceeding setting protection threshold values, immediately by respective switch
The drive signal of pipe sets low, and drive control signal A and B all set low；For switching tube VT12、VT41、VT21、VT32, all do not detect collection
Electrode and the voltage V of transmitting interpolarCE, switching tube VT12Drive signal Drive12With switching tube VT41Drive signal Drive41Only
It is controlled by drive signal A, switching tube VT21Drive signal Drive21With switching tube VT32Drive signal Drive32Only it is controlled by drive
Dynamic signal B；When there is overvoltage, excessively stream, overheating fault, all set low controlling drive signal A and B.
4. a kind of implement claim 1 described in frequency domain electro-prospecting explore high pressure discharger control method it is characterised in that
Two-way drive control signal A anti-phase each other and B are exported by main control unit (8), by the rising edge time delay Δ t of signal A1, obtain
To signal DAOUT,DAOUTForm drive signal D after isolation processingrive11And Drive42, Drive11And Drive42It is respectively used to control to open
Close pipe VT11With switching tube VT42, by the rising edge of signal A and trailing edge time delay Δ t respectively2With Δ t3, obtain signal DAIN,DAIN
Form drive signal D after isolation processingrive12And Drive41, Drive12And Drive41It is respectively used to controlling switch pipe VT12And switch
Pipe VT41, by the rising edge time delay Δ t of signal B1, obtain signal DBOUT,DBOUTForm drive signal D after isolation processingrive22With
Drive31, Drive22And Drive31It is respectively used to control VT22And VT31, by the rising edge of signal B and trailing edge time delay Δ t respectively2With
Δt3, obtain signal DBIN,DBINForm drive signal D after isolation processingrive21And Drive32, Drive21And Drive32It is respectively used to
Controlling switch pipe VT21With switching tube VT32；Δt1>Δt2>Δt3；Switching tube VT in a cycle11、VT12、VT21、VT22、VT31、
VT32、VT41And VT42Turn-on sequence is：
a.VT12、VT41Conducting, VT11、VT42、VT21、VT32、VT22、VT31Turn off,
b.VT12、VT41、VT11、VT42Conducting, VT21、VT32、VT22、VT31Turn off,
c.VT12、VT41Conducting, VT11、VT42、VT21、VT32、VT22、VT31Turn off,
d.VT12、VT41、VT11、VT42、VT21、VT32、VT22、VT31Turn off,
e.VT21、VT32Conducting, VT12、VT41、VT11、VT42、VT22、VT31Turn off,
f.VT21、VT32、VT22、VT31Conducting, VT12、VT41、VT11、VT42, turn off,
g.VT21、VT32Conducting, VT12、VT41、VT11、VT42、VT22、VT31Turn off,
h.VT12、VT41、VT11、VT42、VT21、VT32、VT22、VT31Turn off.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7230837B1 (en) * | 2006-03-27 | 2007-06-12 | North Carolina State University | Method and circuit for cascaded pulse width modulation |
| CN102299638A (en) * | 2011-07-29 | 2011-12-28 | 北京工业大学 | Large-power steady transmitting device with continuously adjustable voltage width range |
| CN103346675A (en) * | 2013-07-11 | 2013-10-09 | 北京工业大学 | High-power cascading electromagnetic emitter system with voltage continuously adjustable in wide range |
| CN103701354A (en) * | 2013-12-28 | 2014-04-02 | 吉林大学 | Electrical source transmitter device with self-adaption dummy load and control method |
| KR101425400B1 (en) * | 2013-08-29 | 2014-08-13 | 한국전력공사 | Power converter for high voltage direct current transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7230837B1 (en) * | 2006-03-27 | 2007-06-12 | North Carolina State University | Method and circuit for cascaded pulse width modulation |
| CN102299638A (en) * | 2011-07-29 | 2011-12-28 | 北京工业大学 | Large-power steady transmitting device with continuously adjustable voltage width range |
| CN103346675A (en) * | 2013-07-11 | 2013-10-09 | 北京工业大学 | High-power cascading electromagnetic emitter system with voltage continuously adjustable in wide range |
| KR101425400B1 (en) * | 2013-08-29 | 2014-08-13 | 한국전력공사 | Power converter for high voltage direct current transmission |
| CN103701354A (en) * | 2013-12-28 | 2014-04-02 | 吉林大学 | Electrical source transmitter device with self-adaption dummy load and control method |
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