CN108227011A - The double-trapezoidal wave emission system and control method of a kind of controllable failing edge - Google Patents
The double-trapezoidal wave emission system and control method of a kind of controllable failing edge Download PDFInfo
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- CN108227011A CN108227011A CN201810105902.XA CN201810105902A CN108227011A CN 108227011 A CN108227011 A CN 108227011A CN 201810105902 A CN201810105902 A CN 201810105902A CN 108227011 A CN108227011 A CN 108227011A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
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Abstract
The present invention relates to transient electromagnetics to emit field, the double-trapezoidal wave emission system and control method of specially a kind of controllable failing edge.The system comprises：Governor circuit, optocoupler driving circuit, transmitting bridge, high voltage transient inhibit diode, low pressure Transient Suppression Diode circuit, series battery and transmitting coil, wherein：The governor circuit is driven by optocoupler and is connect with transmitting bridge, and transmitting bridge is connected with transmitting coil；Series battery is connected as transmitting with transmitting bridge and provides electric power, and high voltage transient inhibits diode, low pressure Transient Suppression Diode circuit in parallel at transmitting coil both ends.The present invention can generate the trapezoidal wave emission current of one group of different turn-off time simultaneously, be respectively used to encourage and measure sensing field signal and polarization response, realization resistivity with polarizability is two-parameter detects simultaneously, improve detection accuracy.
Description
Technical field
The present invention relates to transient electromagnetics to emit field, the double-trapezoidal wave emission system of specially a kind of controllable failing edge and control
Method processed.
Background technology
Traditional transient electromagnetic method measures electromagnetic induction signal, measurement parameter list since the limitation of detection system is only capable of excitation
One, explain that parameter is single, the accuracy that data are explained is relatively low, is the bottleneck of current transient electromagnetic method development.Multi-parameter joint is visited
Survey is to improve the effective ways of TEM detection accuracies, and effect of induced polarization is a kind of common phenomenon for being present in the earth, is detected simultaneously
Transient electromagnetic can effectively improve the Explanation Accuracy to the earth with induced polarization signal.Time-domain electromagnetic induction method (TEM) is logical
It overdrives the earth and generates secondary field, measure secondary induced field and obtain the conductivity information of underground medium；Induced polarization method (IP)
It is by being powered to the earth, excitation generates induced polarization field, and the polarizability that underground medium is obtained by measuring induced polarization field is joined
Number.TEM and IP is with the obvious advantage for water resource, metallic ore detection, in low-frequency time-domain electromagnetic surveying, finds induction field and pole
Change field to exist simultaneously.Early stage induction field rapid decay after switch off current shows as induction field and is coexisted with polarization field, and polarization field is put
Electricity；Late period induction field is almost without predominantly polarization field.There are polarization charge effects in magnetic source emission current failing edge, sending out
Penetrate size of current it is identical in the case of, for short failing edge emit, polarization the charging time it is short, induced polarization field is weak, suitable for sense
Answer field measurement；Long failing edge is emitted, the polarization charging time is longer, induced polarization field strength, suitable for polarization field field measurement.Cause
The trapezoidal wave electric current of one group of this transmitting different turn-off times is feasible method that is a kind of while detecting IP and the bis- fields of TEM.
During in order to enable detection receive system accurately collect emission current excitation magnetic field signal, need to receive with
Emission system synchronizes, frequently with the GPS methods of synchronization in the case of transmitting and receiving device is apart from each other, but in some letters
Number bad area, as remote mountain areas, jungle, there is high-lager building to block urban district etc., GPS signal it sometimes appear that lose,
Conventional transient electromagnetic emission system usually occurs because not receiving synchronizing signal so that the situation that system can not work.
Chinese patent CN105510979A discloses a kind of Transient Electromagnetic Transmitter circuit for loading parallel discharge, is to pass through
Change loading coil connection mode, shorten loading coil discharge time, reduce the shutdown delay of transmitter, but be only capable of to sense
Field signal is answered to measure.
105119588 A of Chinese patent CN disclose a kind of transient electromagnetic method pulse current radiating circuit, pass through energy regenerative perseverance
Clamp circuit is pressed, electric current failing edge clamp voltage is improved, shortens the failing edge time, improve the failing edge linearity, but still
It is old to realize resistivity and polarizability is two-parameter detects simultaneously.
Invention content
The present invention provides a kind of the double-trapezoidal wave emission system and control method of controllable failing edge, and solution can not realize resistance
Rate and polarizability two-parameter the problem of detecting simultaneously.
The invention is realized in this way
A kind of double-trapezoidal wave emission system of controllable failing edge, the system comprises：
Governor circuit, optocoupler driving circuit, transmitting bridge, high voltage transient inhibit diode, low pressure Transient Suppression Diode
Circuit, series battery and transmitting coil, wherein：The governor circuit is driven by optocoupler and is connect with transmitting bridge, is emitted
Bridge is connected with transmitting coil；Series battery and transmitting bridge are connected as transmitting and provide electric power, high voltage transient inhibit diode,
Low pressure Transient Suppression Diode circuit in parallel is at transmitting coil both ends.
Further, the transmitting bridge is made of a heavy-duty diode D1 and four power field effect pipes, wherein
Power field effect pipe S1 connects with power field effect pipe S3, and power field effect pipe S2 connects with power field effect pipe S4, two strings
Connection circuit is in parallel again, and junction and the power field effect pipe S2 and power field of power field effect pipe S1 and power field effect pipe S3 are imitated
Should the output as radiating circuit of junction of pipe S4 connect with transmitting coil, the positive grades of heavy-duty diode D1 and series-connected cell
Group anode connection, cathode connect with the common end of power field effect pipe S1 and power field effect pipe S2, series battery cathode and
Power field effect pipe S3 is connected with the common end of power field effect pipe S4, and four control signals of governor circuit control four respectively
Power field effect pipe is connected, so as to control the electric current trapezoidal wave generated on transmitting coil positively or negatively.
Further, the first control square wave of the governor circuit generation two-way transmitting bridge and the second control square wave, first
Control square wave drives generation two path control signal to be respectively used to control power field effect pipe S1 and power field effect pipe S4 through optocoupler,
Second control square wave drives generation two path control signal to be respectively used to control power field effect pipe S2 and power field effect through optocoupler
Pipe S3.
Further, low pressure Transient Suppression Diode circuit includes：Low pressure Transient Suppression Diode, the low pressure transient state suppression
After diode both ends processed are connect respectively with power field effect pipe S5 with power field effect pipe S6, power field effect pipe S5 and power field
Effect pipe S6 is connect respectively with power field effect pipe S7, power field effect pipe S8, whole to be connected in parallel on transmitting coil both ends, power again
Field-effect tube S5, power field effect pipe S6, power field effect pipe S7 and power field effect pipe S8, wherein power field effect pipe S7
Signal is controlled via optocoupler drive control, power field effect pipe S5 by the failing edge of governor circuit with power field effect pipe S8
It is imitated with power field effect pipe S6 by two control square waves of governor circuit by nor gate and power field effect pipe S5, power field
It should pipe S6 connections.
Further, when failing edge control signal is low level, power field effect pipe S7, power field effect pipe S8 break
It opens, transmitting coil generates a voltage overshoot very high with electric current amplitude in the same direction, by being connected in parallel on hair due to the presence of inductance
The high voltage transient at ray circle both ends inhibits diode release, when transmitting coil both end voltage inhibits diode clamp higher than high voltage transient
During the voltage of position, high voltage transient inhibits diode current flow and by transmitting coil both end voltage clamper on its clamp voltage, realizes hair
Radio stream turns off soon.
Further, when failing edge control signal is high level, power field effect pipe S7, power field effect pipe S8 are led
Logical, switch off current moment, two control square waves of governor circuit are low level, and nor gate output signal is high level, power
Field-effect tube S5, power field effect pipe S6 are connected, and low pressure transient voltage suppressor paralleling is in transmitting coil both ends, the suppression of low pressure transient state
Diode-clamped voltage processed is very low, and when voltage overshoot is higher than low pressure Transient Suppression Diode breakdown voltage, low pressure transient state inhibits
Diode current flow and by coil both end voltage clamper on a very low voltage, realize emission current turn off slowly.
Further, the system also includes double synchronization modules, synchronous with the double synchronous modes of the Big Dipper using GPS, work as master control
After circuit receives the synchronizing signal that double synchronization modules generate, governor circuit generates two-way transmitting bridge according to the emission parameter of setting
Road controls square-wave signal and failing edge control square wave, governor circuit to be drivingly connected by control signal output mouth and optocoupler.
Further, the system also includes absorbing circuit, the absorbing circuit includes absorption resistance, absorption resistance both ends
Power field effect pipe S9 and the driving of the optocoupler of power field effect pipe S10 and power field effect pipe, the absorbing circuit passes through
The absorbing circuit control signal that the governor circuit generates controls, and after switch off current, absorbing circuit control signal becomes high level,
Power field effect pipe S9, power field effect pipe S10 are connected, and absorption resistance is connected in parallel on transmitting coil both ends, absorb failing edge tail portion
Concussion.
A kind of double-trapezoidal wave emission control method of controllable failing edge, the method includes：
Step 1, with reference to electric conductivity, the polarization characteristic for measuring area, is set using soft load mode and sent out according to detection demand
The period of radio stream, duty cycle parameters by two timers of parameter configuration to governor circuit, are led to using pulse modulation technology
Optocoupler driving is crossed to control transmitting bridge；
Step 2 governor circuit exports square wave after receiving synchronizing signal, and using driving, control transmitting bridge is in emission lines
Period, the adjustable bipolarity trapezoidal wave of duty ratio are generated on circle；
Step 3 is during first group of trapezoidal wave turns off, and high voltage transient in parallel inhibits diode electric on transmitting coil
It presses through impact to wear, by transmitting coil both end voltage clamper, it can be achieved that failing edge turns off soon on high voltage；
Step 4 is during second group of trapezoidal wave turns off, by the way that low pressure transient state in parallel on transmitting coil is controlled to inhibit two
Pole pipe circuit turn-on, by transmitting coil both end voltage clamper, it can be achieved that failing edge turns off slowly in low-voltage.
Further, in step 2, the process that governor circuit receives output square wave after synchronizing signal is：GPS synchronizing signals
Start simultaneously with the double synchronous modes of Big Dipper synchronizing signal, first pulse per second (PPS) is triggered using GPS synchronizing signals outside governor circuit
It interrupts, the control square-wave signal of excitation governor circuit output transmitting bridge, second pulse per second (PPS) is triggered using Big Dipper synchronizing signal
Governor circuit external interrupt so repeatedly, when governor circuit external interrupt is triggered twice in succession by Big Dipper synchronizing signal, is then sentenced
Determine GPS synchronizing signals loss, governor circuit is only using Big Dipper synchronizing signal as lock-out pulse at this time；When governor circuit external interrupt
When being triggered twice in succession by GPS synchronizing signals, then judge that Big Dipper synchronizing signal is lost, governor circuit is only made with GPS signal at this time
For lock-out pulse.
Compared with prior art, the present invention advantageous effect is：The present invention can generate one group of different turn-off time simultaneously
Trapezoidal wave emission current, be respectively used to encourage and measure sensing field signal and polarization response, realize that resistivity is double with polarizability
Parameter detects simultaneously, improves detection accuracy；Using GPS and the double synchronous modes of the Big Dipper, synchronizing signal realizes complementation, improves
System is in the stability of the bad district work of signal.
Description of the drawings
Fig. 1 emission system overall structure figures provided in an embodiment of the present invention；
Fig. 2 failing edge control circuit schematic diagrams provided in an embodiment of the present invention；
Fig. 3 absorbing circuit schematic diagrams provided in an embodiment of the present invention；
Fig. 4 emission system governor circuit program flow diagrams provided in an embodiment of the present invention
Fig. 5 emission system control sequential oscillograms provided in an embodiment of the present invention；
The double-trapezoidal wave emission current oscillograph sectional drawing of Fig. 6 controllable failing edges provided in an embodiment of the present invention, under 6a is fast
For drop along oscillogram, 6b is slow failing edge oscillogram.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Referring to shown in Fig. 1 combinations Fig. 5, the double-trapezoidal wave emission system of controllable failing edge provided by the invention, mainly by leading
Control circuit 1, double synchronization modules 2, button 3, liquid crystal display 4, optocoupler driving combination 5, transmitting bridge 6, high voltage transient inhibition two
Pole pipe 7, low pressure Transient Suppression Diode circuit 8, absorbing circuit 9, transmitting coil 10, series battery 11, lithium battery 12, low pressure
Power supply 13 and high voltage power supply 14 are formed, wherein double synchronization modules 2 have the Big Dipper and the bis- synchronous modes of GPS, low pressure transient state inhibits two
Pole pipe circuit 8 is made of low pressure Transient Suppression Diode 15 and a series of switching devices.High voltage transient inhibits diode 7 and low pressure
Transient Suppression Diode circuit 8 collectively forms failing edge control circuit, is connected in parallel on 10 both ends of transmitting coil.Governor circuit 1 is distinguished
It connect with double synchronization modules 2, button 3, liquid crystal display 4, and is connect by optocoupler driving combination 5 with transmitting bridge 6, emit bridge
Road 6 and transmitting coil 10 connect, and series battery 11 is connected as transmitting with transmitting bridge 6 and provides electric power, and high voltage transient inhibits two
Pole pipe 7, low pressure Transient Suppression Diode circuit 8 and absorbing circuit 9 are connected in parallel on 10 both ends of transmitting coil, and emission system uses lithium electricity
Pond 12 powers, and low-tension supply 13 is obtained as power supplies such as governor circuit 1, double synchronization modules 2, liquid crystal displays 4 through DC/DC, through DC/
DC obtains high voltage power supply 14 and provides driving voltage for optocoupler driving combination 5.
Governor circuit 1 be using ARM as the microcontroller of processor, including double synchronization module PORT COMs, key-press input interface,
Liquid crystal display interface, control signal output mouth.Button 3 and liquid crystal display 4 pass through key-press input interface and liquid crystal display
Screen interface is connect with governor circuit 1, forms human-computer interaction interface.Transmitted waveform pulsewidth, period are set by human-computer interaction interface,
The parameters such as failing edge radiation pattern.Double synchronization modules 2 are connect with governor circuit 1 by double synchronization module PORT COMs, using GPS
Synchronous with the double synchronous modes of the Big Dipper, after governor circuit 1 receives the synchronizing signal that double synchronization modules 2 generate, governor circuit 1 is pressed
The the first control square wave U1 and the second control square wave U2 of two-way transmitting bridge 6, the two square waves are generated according to the emission parameter of setting
Control sequential there are one phase difference, as the first control square wave U1 high, electric current forward flow, during the second control square wave U2 high,
Electric current negative sense flows, failing edge control square wave U3 and absorbing circuit control square wave U4.Governor circuit 1 passes through control signal output
Mouth combines 5 connections with optocoupler driving, and the first control square wave U1 is through 5 generation two path control signal (Q1, Q4) of optocoupler driving, the first control
Square wave U2 processed drives through optocoupler and generates two path control signal (Q2, Q3).
Shown in Figure 2, optocoupler driving combination 5 is connect with transmitting bridge 6, and transmitting bridge 6 is by a heavy-duty diode
D1 and four power field effect pipe composition, power field effect pipe S1 connect with power field effect pipe S3, power field effect pipe S2 and
Power field effect pipe S4 connects, and two series circuits are in parallel again, the junction of power field effect pipe S1 and power field effect pipe S3
It is connect with the output as radiating circuit of the junction of power field effect pipe S2 and power field effect pipe S4 with transmitting coil 10,
Heavy-duty diode D1 anodes are connect with 11 anode of series battery, cathode and power field effect pipe S1 and power field effect pipe S2
Common end connection, 11 cathode of series battery connect with the common end of power field effect pipe S3 and power field effect pipe S4.Control
Signal Q1, Q2, Q3, Q4 processed control power field effect pipe S1, S2, S3, S4 to be connected respectively.When the first control square wave U1 control sequentials
When controlling the sequential low level of square wave U2 for high level, second, power field effect pipe S1, power field effect pipe S4 conducting, power
Field-effect tube S2, power field effect pipe S3 are turned off, and positive electric current trapezoidal wave is generated on transmitting coil 10；When the first controlling party
Wave U1 control sequentials be low level, second control square wave U2 high level when, power field effect pipe S2, power field effect pipe S3 are led
It is logical, power field effect pipe S1, power field effect pipe S4 shutdown, the electric current trapezoidal wave of generation negative sense on transmitting coil 10.
Low pressure Transient Suppression Diode circuit 8 is by power field effect pipe, 2 nor gates (G1, G2), 4 optocouplers drivings and
Low pressure Transient Suppression Diode 15 forms, the wherein first control signal U1 of transmitting bridge 6, second control signal U2 conduct or non-
The input of door (G1, G2), nor gate output are connect through optocoupler with power field effect pipe S5, power field effect pipe S6, failing edge control
Signal U3 processed is given to power field effect pipe S7, power field effect pipe S8,15 both ends of low pressure Transient Suppression Diode through optocoupler driving
Respectively with power field effect pipe S5, power field effect pipe S6, both ends connect with power field effect pipe S7, power field effect pipe S8
It connects, it is whole to be connected in parallel on 10 both ends of transmitting coil again.
When failing edge control signal U3 is low level, power field effect pipe S7, power field effect pipe S8 are disconnected, emission lines
Circle 10 can generate a voltage overshoot very high with electric current amplitude in the same direction, due to depositing for diode D1 due to the presence of inductance
It can not be discharged, therefore can only be by simultaneously by the fly-wheel diode for the power field effect pipe for forming transmitting bridge 6 in, voltage overshoot
The high voltage transient for being associated in 10 both ends of transmitting coil inhibits diode 7 to discharge.When 10 both end voltage of transmitting coil is higher than high voltage transient
When inhibiting 7 clamp voltage of diode, high voltage transient inhibits diode 7 to be connected and by 10 both end voltage clamper of transmitting coil in its pincers
On the voltage of position.Inductive load both end voltage is represented with curent change as shown in formula (1)：
Wherein, U is load both end voltage, and L is load inductance value, and di/dt is flows through load current change rate.According to public affairs
Formula, in the case that load is constant, both end voltage is directly proportional to current changing rate.Transmitting coil 10 can be equivalent to inductance and electricity
The series connection of resistance, high voltage transient inhibits 7 clamp voltage of diode very high, thus emission current declines quickly, realizes that emission current is fast
Shutdown.
When failing edge control signal U3 is high level, power field effect pipe S7, power field effect pipe S8 conducting, electric current close
Disconnected moment, first control signal U1, second control signal U2 are low level, and nor gate (G1, G2) output signal U 4 is high electricity
Flat, power field effect pipe S5, power field effect pipe S6 conducting, low pressure Transient Suppression Diode 15 are connected in parallel on 10 liang of transmitting coil
End, 15 clamp voltage of low pressure Transient Suppression Diode is very low, when voltage overshoot is higher than 15 breakdown potential of low pressure Transient Suppression Diode
During pressure, low pressure Transient Suppression Diode 15 is connected and by coil both end voltage clamper on a very low voltage, realizes transmitting
Electric current turns off slowly.By controlling failing edge that signal U3 is controlled to obtain the trapezoidal wave emission current of one group of different turn-off time.
Shown in Figure 3, absorbing circuit 9 is by absorption resistance 31, optocoupler driving and power field effect pipe S9, power field effect
Pipe S10 is formed, and absorption resistance 31 will meet shown in condition such as formula (2)：
Wherein, L be 10 inductance value of transmitting coil, CstrayFor radiating circuit stray capacitance.Absorbing circuit control signal U5
Power field effect pipe S9, power field effect pipe S10, S10 points of power field effect pipe S9, power field effect pipe are given to through optocoupler driving
It is not connected in parallel on 31 both ends of absorption resistance, it is whole in parallel with transmitting coil 10 again, output signal U 5 is controlled after switch off current by low
Level becomes high level, and exporting control signal (Q9, Q10) through optocoupler controls power field effect pipe S9, power field effect pipe S10 to lead
It is logical to make absorption resistance 31 in parallel with transmitting coil 10, effectively absorb emission current tail portion and shake, obtain it is the second best in quality controllably under
It drops along double-trapezoidal wave emission current.
It is shown in Figure 4, the control method of the double-trapezoidal wave of controllable failing edge provided by the invention,
1) according to detection demand, with reference to electric conductivity, the polarization characteristic for measuring area, pass through button (3) and liquid crystal display
(4) human-computer interaction interface formed is using parameters such as period, the duty ratios of soft load mode setting emission current, by parameter configuration
Into two timers of governor circuit 1,5 pairs of transmitting bridges 6 of combination is driven to control by optocoupler using pulse modulation technology
System；
2) emission system is synchronous with the double synchronous modes of the Big Dipper using GPS.Double synchronization modules 2 are double synchronous with the Big Dipper with GPS
Pattern is connect with governor circuit 1.GPS and the double synchronous modes of the Big Dipper start simultaneously, and first pulse per second (PPS) uses GPS synchronizing signals
Governor circuit (1) external interrupt is triggered, excitation governor circuit 1 exports the control square-wave signal of transmitting bridge 6, second pulse per second (PPS)
1 external interrupt of governor circuit is triggered using Big Dipper synchronizing signal, so repeatedly.When 1 external interrupt of governor circuit is synchronized by the Big Dipper
When signal triggers twice in succession, then judge that GPS synchronizing signals are lost, governor circuit 1 is only using Big Dipper signal as synchronous arteries and veins at this time
Punching；When 1 external interrupt of governor circuit is triggered twice in succession by GPS synchronizing signals, then judge that Big Dipper synchronizing signal is lost, at this time
Governor circuit 1 is only using GPS signal as lock-out pulse.Using GPS and the operating mode of the double synchronous complementations of the Big Dipper, system is improved
In the stability of the bad district work of signal.
In the present embodiment, the switching device of transmitting bridge 6, low pressure Transient Suppression Diode circuit 8 and absorbing circuit 9 is selected
Power field effect pipe selects the rectangular loop that the length of side is 25m as transmitting coil 10, and it is 0.2 Ω to measure 10 resistance of transmitting coil,
Inductance is 0.2mH, and the storage battery that voltage is selected to be 12V is powered as series battery 11, and emission lines are sealed in using 1 Ω noninductive resistances
10 sampling emission current of circle, selects according to the voltage of the breakdown voltage of 6 switching device of transmitting bridge and series battery 11
SMCJ13CA high voltage transients inhibit diode 7 and SMCJ5CA low pressure Transient Suppression Diode 15.Governor circuit 1 receives synchronization
After signal the first control of output square wave U1, the second control square wave U2, the first control square wave U1 for timing through driving generate signal Q1,
Q4, power field effect pipe S1, power field effect pipe the S4 conducting of control transmitting bridge 6, generates forward direction on transmitting coil 10
Electric current；Second control square wave U2 generates signal Q2, Q3 for timing through driving, controls power field effect pipe S2, the work(of transmitting bridge 6
Rate field-effect tube S3 is connected, and the electric current of negative sense is generated on transmitting coil 10.Pass through the first control square wave of control U1, the second control
Square wave U2 can generate period, the adjustable bipolarity trapezoidal wave of duty ratio on transmitting coil 10；
3) during first group of trapezoidal wave turns off, first group of trapezoidal wave refers to：One trapezoid wave and one are negative trapezoidal
Wave is one group of trapezoidal wave.During first positive wave shutdown and first negative wave shutdown, high voltage transient inhibits diode 7 by voltage
Overshoot breakdown, by 10 both end voltage clamper of transmitting coil, it can be achieved that failing edge turns off soon on high voltage；The linear quick closing valve of electric current breaks
Shown in fall time calculation formula such as formula (3)：
Wherein I is emits flat-top end current value, LCOILIt, can be by calculating or measuring to emit 10 inductance value of transmitting coil
It obtains, UHTVSInhibit 7 clamp voltage of diode for high voltage transient.Diode 7, U is inhibited to SMCJ13CA high voltage transients in formulaHTVS
For 21.5V.
4) during second group of trapezoidal wave turns off, second positive wave shutdown and the are referred to during second group of trapezoidal wave shutdown
During two negative wave shutdowns, governor circuit 1 generates failing edge control signal U3, then is driven through optocoupler and generate signal Q7, signal Q8,
Control power field effect pipe S7, power field effect pipe S8 conductings respectively, the first control square wave U1, the second control square wave U2 are equal at this time
For low level, nor gate output signal U 4 is high level, then is driven through optocoupler and generate signal Q5, signal Q6, controls power respectively
Field-effect tube S5, power field effect pipe S6 are connected, and low pressure Transient Suppression Diode 15 is connected in parallel on 10 both ends of transmitting coil at this time, will
10 both end voltage clamper of transmitting coil is in low-voltage, it can be achieved that failing edge turns off slowly.The linear slow turn-off decay time meter of electric current
It calculates shown in formula such as formula (4)：
Wherein ULTVSFor 15 clamp voltage of low pressure Transient Suppression Diode, UDedioFor switching device fly-wheel diode pressure drop,
UMOSForward voltage drop during for switch device conductive.To SMCJ5CA low pressure Transient Suppression Diode (11), U in formulaHTVSFor 9.2V；It is right
Power field effect pipe, UDedioFor 0.7V, UMOSVery little can be ignored.
By the way that high voltage transient is controlled to inhibit the clamp voltage of diode 7 and low pressure Transient Suppression Diode 15, by emission lines
It encloses 10 both ends to be maintained in high pressure and low pressure, the controllable bipolarity group of transmitting failing edge is finally realized in a current cycle
Close trapezoidal wave.
Double-trapezoidal wave emission current oscillograph sectional drawings of the Fig. 6 (a) and Fig. 6 (b) for controllable failing edge, respectively fast failing edge
Trapezoidal wave emission current and slow failing edge trapezoidal wave emission current, fully demonstrate effectiveness of the invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of double-trapezoidal wave emission system of controllable failing edge, which is characterized in that the system comprises：
Governor circuit, optocoupler driving circuit, transmitting bridge, high voltage transient inhibit diode, low pressure Transient Suppression Diode circuit,
Series battery and transmitting coil, wherein：The governor circuit is driven by optocoupler and connect with transmitting bridge, transmitting bridge with
Transmitting coil connects；Series battery is connected as transmitting with transmitting bridge and provides electric power, and high voltage transient inhibits diode, low pressure wink
State inhibits diode circuit to be connected in parallel on transmitting coil both ends.
2. system described in accordance with the claim 1, which is characterized in that the transmitting bridge is by a heavy-duty diode D1 and four
A power field effect pipe composition, wherein power field effect pipe S1 connects with power field effect pipe S3, power field effect pipe S2 and work(
Rate field-effect tube S4 connects, and two series circuits are in parallel again, the junction of power field effect pipe S1 and power field effect pipe S3 with
The output as radiating circuit of the junction of power field effect pipe S2 and power field effect pipe S4 is connect with transmitting coil, big work(
The positive grades of rate diode D1 are connect with series battery anode, and cathode is public with power field effect pipe S1's and power field effect pipe S2
End connection, series battery cathode are connect with the common end of power field effect pipe S3 and power field effect pipe S4, governor circuit
Four control signals control four power field effect pipe conductings respectively, so as to control the electricity generated on transmitting coil positively or negatively
Flow trapezoidal wave.
3. system described in accordance with the claim 2, which is characterized in that the governor circuit generates two-way transmitting bridge first and controls
Square wave and the second control square wave, the first control square wave drive generation two path control signal to be respectively used to control power field effect through optocoupler
Should pipe S1 and power field effect pipe S4, the second control square wave drives through optocoupler to be generated two path control signal and is respectively used to control power
Field-effect tube S2 and power field effect pipe S3.
4. system described in accordance with the claim 1, which is characterized in that low pressure Transient Suppression Diode circuit includes：Low pressure transient state
Inhibit diode, the low pressure Transient Suppression Diode both ends are connect respectively with power field effect pipe S5 with power field effect pipe S6
Afterwards, power field effect pipe S5 is connect with power field effect pipe S6 with power field effect pipe S7, power field effect pipe S8 respectively, whole
It is connected in parallel on transmitting coil both ends, power field effect pipe S5, power field effect pipe S6, power field effect pipe S7 and power field effect again
Should pipe S8, wherein power field effect pipe S7 and power field effect pipe S8 by the failing edge of governor circuit control signal via light
Coupling drive control, power field effect pipe S5 and power field effect pipe S6 pass through nor gate by two control square waves of governor circuit
It is connect with power field effect pipe S5, power field effect pipe S6.
5. according to the system described in claim 4, which is characterized in that when failing edge control signal is low level, power field effect
Should pipe S7, power field effect pipe S8 disconnect, it is very high to generate an amplitude in the same direction with electric current due to the presence of inductance for transmitting coil
Voltage overshoot, by be connected in parallel on transmitting coil both ends high voltage transient inhibit diode discharge, when transmitting coil both end voltage
When inhibiting diode-clamped voltage higher than high voltage transient, high voltage transient inhibits diode current flow and clamps transmitting coil both end voltage
Realize that emission current turns off soon on its clamp voltage in position.
6. according to the system described in claim 4, which is characterized in that when failing edge control signal is high level, power field effect
Should pipe S7, power field effect pipe S8 conducting, switch off current moment, two of governor circuit control square waves are low level or non-
Door output signal is high level, and power field effect pipe S5, power field effect pipe S6 are connected, and low pressure transient voltage suppressor paralleling exists
Transmitting coil both ends, low pressure Transient Suppression Diode clamp voltage is very low, when voltage overshoot is higher than low pressure Transient Suppression Diode
During breakdown voltage, low pressure Transient Suppression Diode is connected and by coil both end voltage clamper on a very low voltage, realizes
Emission current turns off slowly.
7. system described in accordance with the claim 1, which is characterized in that the system also includes double synchronization modules, using GPS and north
The double synchronous modes of bucket synchronize, and after governor circuit receives the synchronizing signal that double synchronization modules generate, governor circuit is according to setting
Emission parameter generate two-way transmitting bridge control square-wave signal and failing edge control square wave, governor circuit is by controlling signal
Output port is drivingly connected with optocoupler.
8. system described in accordance with the claim 1, which is characterized in that the system also includes absorbing circuit, the absorbing circuit
Including absorption resistance, the power field effect pipe S9 at absorption resistance both ends and power field effect pipe S10 and power field effect pipe
Optocoupler drives, and the absorbing circuit controls signal to control by the absorbing circuit that the governor circuit generates, and after switch off current, inhales
It receives circuit control signal and becomes high level, power field effect pipe S9, power field effect pipe S10 conducting, absorption resistance is connected in parallel on hair
Ray circle both ends absorb the concussion of failing edge tail portion.
9. a kind of double-trapezoidal wave emission control method of controllable failing edge, which is characterized in that the method includes：
Step 1, with reference to electric conductivity, the polarization characteristic for measuring area, transmitting electricity is set using soft load mode according to detection demand
The period of stream, duty cycle parameters by two timers of parameter configuration to governor circuit, pass through light using pulse modulation technology
Coupling driving controls transmitting bridge；
Step 2 governor circuit exports square wave after receiving synchronizing signal, and using driving, control transmitting bridge is on transmitting coil
Generate period, the adjustable bipolarity trapezoidal wave of duty ratio；
Step 3 is during first group of trapezoidal wave turns off, and high voltage transient in parallel inhibits diode by voltage mistake on transmitting coil
Impact is worn, by transmitting coil both end voltage clamper, it can be achieved that failing edge turns off soon on high voltage；
Step 4 is during second group of trapezoidal wave turns off, by controlling low pressure Transient Suppression Diode in parallel on transmitting coil
Circuit turn-on, by transmitting coil both end voltage clamper, it can be achieved that failing edge turns off slowly in low-voltage.
10. according to the method for claim 9, which is characterized in that in step 2, governor circuit receives defeated after synchronizing signal
The process for going out square wave is：GPS synchronizing signals and the double synchronous modes of Big Dipper synchronizing signal start simultaneously, and first pulse per second (PPS) uses
GPS synchronizing signals triggering governor circuit external interrupt, the control square-wave signal of excitation governor circuit output transmitting bridge, second
Pulse per second (PPS) triggers governor circuit external interrupt using Big Dipper synchronizing signal, so repeatedly, when governor circuit external interrupt is by the Big Dipper
When synchronizing signal triggers twice in succession, then judge GPS synchronizing signals lose, at this time governor circuit only using Big Dipper synchronizing signal as
Lock-out pulse；When governor circuit external interrupt is triggered twice in succession by GPS synchronizing signals, then judge that Big Dipper synchronizing signal is lost
It loses, governor circuit is only using GPS signal as lock-out pulse at this time.
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