CN102510233B - Multifunctional current impulse transmitter control method - Google Patents
Multifunctional current impulse transmitter control method Download PDFInfo
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- CN102510233B CN102510233B CN201110310151.3A CN201110310151A CN102510233B CN 102510233 B CN102510233 B CN 102510233B CN 201110310151 A CN201110310151 A CN 201110310151A CN 102510233 B CN102510233 B CN 102510233B
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Abstract
The invention relates to a multifunctional current impulse transmitter and a control method. The transmitter is formed according to the following method: the positive electrode of a two-gear direct current power supply is connected with a depressurization chopping constant-current circuit, a clamping circuit, a short-circuit and bridge arm direct connection protective circuit, a bipolar current impulse generator and a load through a switch K; and the negative electrode of the two-gear direct current power supply is connected with the load through the depressurization chopping constant-current circuit and the bipolar current impulse generator. According to the invention, the two-gear direct current power supply is adopted to coarsely regulate an output voltage; the depressurization chopping constant-current circuit is used so as to precisely regulate the output voltage, thereby reducing the variation range of the duty ratio of the depressurization chopping constant-current circuit and improving efficiency; the clamping circuit can perform bootstrap on a capacitor of a clamping voltage source to generate a high voltage in no need of improving the voltage of a direct current power supply or providing an auxiliary power supply; the linearity and the steepness of the failing edge of the current impulse are changed through regulating the voltage of the linear clamping voltage source; and the short-circuit and bridge arm direct connection protective circuit is matched with an impulse controller, so that the circuit has a self-repairing function after a failure is removed.
Description
Technical field:
The present invention relates to the electrical measuring instrument, in a kind of geophysical exploration, being especially applicable to load is current impulse transmitter and the control method of coil and equivalent inductance 1mH～7mH, equivalent resistance 10～80 Ω of equivalent inductance hundreds of μ H-2mH, equivalent resistance 0.3～2 Ω.
Background technology:
In geophysical exploration, the electrical method instrument corresponding with electrical prospecting method, its load mainly contains following two kinds: a kind of is the coil being surrounded by transmitting wire, and another kind is two the earth between hole.Front a kind of magnetic source that is called, load equivalent inductance is hundreds of μ H～2mH, equivalent resistance is 0.3～2 Ω; Rear a kind of grounded source that is called, load equivalent inductance 1mH～7mH, equivalent resistance 10～80 Ω, equivalent inductance is mainly that the inductance to the wire of transmitter determines by two holes, the resistance sum of the earth between the resistance that equivalent resistance is wire and two melt pits.
While exporting same electric current in these two kinds of loads, the emitting voltage of their correspondences differs 10～25 times, so the output voltage of transmitter need to have wider excursion.The conventional method adopting is by the duty of power ratio control switching tube, recently to change the size of output voltage, yet due to the wide variation of duty ratio, will cause device loss excessive, and efficiency is low.
For the H bridge of generation current pulse, the anti-straight-through protection of conventional short circuit and brachium pontis is the string silk of insuring in current flowing loop, after fault occurs, need to again change fuse, does not have self-repair function.For brachium pontis, anti-straight-through to also have a kind of method of main flow be the driving pulse interlock function that one-sided brachium pontis is set, yet after this method can not solve driving pulse interlock circuit, the bridge arm direct pass causing due to external interference before power tube.
The transient electromagnetic method that is coil for load (TEM), the trailing edge that requires current impulse is linear decline; The time-domain induced polarization method that is the earth for load (TIP), requires the rising edge of current impulse and trailing edge steep as much as possible, reduces the impact on intensification rate; The controllable source audio-frequency magnetotelluric magnetic method (CSAMT) that is earth load for load requires the rising edge of current impulse and trailing edge steep as much as possible when high frequency, thereby suppresses the impact of emission electrode line inductance, improves output current.Conventional method is to adopt accessory power supply that the rising edge of current impulse and trailing edge is clamped to high pressure, reaches and accelerates rising edge and trailing edge, and make trailing edge have the object of certain linearity.Because making emission system complexity, needs accessory power supply strengthens.
Summary of the invention:
Object of the present invention is just for above-mentioned the deficiencies in the prior art, provides a kind of novel topological structure that adopts to make transmitter can be used in Multifunctional current impulse transmitter and the control method of grounded source and magnetic source load.
The object of the invention is to be achieved through the following technical solutions:
Multifunctional current impulse transmitter, by K switch, to connect buck chopper current stabilization circuit 2 by two grades of DC power supply 1 positive poles, clamped circuit 4, short circuit and bridge arm direct pass protective circuit 7, bipolar current pulse generator 8 is connected with load 9, current stabilization control circuit 3 is connected with buck chopper current stabilization circuit 2, clamped circuit 4 is connected with controlling circuit of voltage regulation 6 through clamped voltage source 5, two grades of DC power supply 1 negative poles are through buck chopper current stabilization circuit 2, bipolar current pulse generator 8 is connected with load 9, clamped voltage source 5 input negative poles are connected with buck chopper current stabilization circuit 2 output negative poles, pulse control circuit 10 is connected with bipolar current pulse generator 8, controlling circuit of voltage regulation 6 connects and composes with clamped circuit 4.
Multifunctional current impulse transmitter control method, comprises following order and step:
A, when load is equivalent inductance hundreds of μ H-2mH, during the magnetic source of equivalent resistance 0.3～2 Ω, K switch is got to V
lshelves, when load is equivalent inductance 1mH～7mH, during the grounded source of equivalent resistance 10～80 Ω by the V that gets to of K switch
hshelves;
B, regulating impulse control circuit 10 produce and drive signal, with this drive bipolar current pulse generator 8, produce periodic current impulse;
C, adjusting controlling circuit of voltage regulation 6, current stabilization control circuit 3, making negative section 9 both end voltage is V
0(t), to flow through the current impulse of load 9 be I to Xiang Yingyou
0(t);
D, give the output V of buck chopper current stabilization circuit 2
iset a threshold voltage V the highest
imax, setting current stabilization value is I
g, work as VT
1, VT
4or VT
2, VT
3driving signal while being high level, detect and flow through inductance L
1average current I
i, average current I
iafter proportional integral is processed as subtrahend and minuend I
gask poor, then according to the size of difference, change the VT of IGBT
6duty ratio, adjusts output voltage, makes to flow through inductance L
1average current I
iequal the current stabilization value I setting
gif output voltage arrives the highest threshold voltage V setting
imaxtime do not reach preset setting current stabilization value I yet
g, regulate VT
6duty ratio make output voltage V
i=V
imax, realize the current stabilization of buck chopper current stabilization circuit 2 and control;
E, set a threshold voltage V to clamped voltage source 5
c1, the voltage in capacitor C is higher than V
c1time, meeting next VT
1, VT
4or VT
2, VT
3driving signal rising edge while coming, open VT
5in IGBT, until the voltage in capacitor C drops to V
c1time close VT
5in IGBT, realize the voltage stabilizing of clamped voltage source 5 and control;
F, when IGBT is when having electric current to flow through, the voltage difference V of collector and emitter
cecan increase along with the increase of current flowing the collector electrode while setting an IGBT conducting and the voltage difference V of transmitter
cemaximum threshold values V
cemax, when the H bridge generation output short-circuit in bipolar current pulse generator 8 or brachium pontis occur to lead directly to, detect VT
1-VT
4the voltage difference V of collector and emitter
ceif, the voltage difference V of the collector and emitter under conducting state of any one among VT1-VT4
cebe greater than maximum threshold values V
cemaxsurpass 1 μ s and with the time by 4 times of IGBT normal turn-off, turn-off IGBT, realize the control of short circuit and bridge arm direct pass protection.
Beneficial effect: the present invention compared with prior art, the one, adopt two grades of DC power supply to carry out output voltage coarse adjustment, with step-down current stabilization copped wave current stabilization circuit, carry out output voltage accurate adjustment, dwindled the excursion of step-down current stabilization copped wave current stabilization circuit duty ratio, improved efficiency; The 2nd, clamped circuit can be booted and be produced high pressure on the electric capacity of clamped voltage source, at the rising edge of current impulse and trailing edge by the voltage clamping of load to the high pressure on electric capacity, thereby accelerate rising edge and the trailing edge of current impulse, and do not need to improve DC power supply voltage or accessory power supply is provided; The 3rd, by regulating the voltage of the clamped voltage source of line can change the linearity and the steepness of the trailing edge of current impulse; The 4th, by short circuit and bridge arm direct pass protective circuit coordinate with impulse controller also can protect in time and have fault while making transmitter output short-circuit or bridge arm direct pass and get rid of after circuit self-repair function.
Accompanying drawing explanation:
Accompanying drawing 1: Multifunctional current impulse transmitter structured flowchart
Accompanying drawing 2: Multifunctional current impulse transmitter circuit theory diagrams
Accompanying drawing 3: main element oscillogram while exporting 100% duty ratio bipolar current pulse
Accompanying drawing 4: main element oscillogram while exporting 50% duty ratio bipolar current pulse
Accompanying drawing 5a: t0～t1 operation time current flowing loop in t0～t1 operation time and Fig. 4 in Fig. 3
Accompanying drawing 5b: t2～t3 operation time current flowing loop in t1～t2 operation time and Fig. 4 in Fig. 3
Accompanying drawing 5c: t3～t4 operation time current flowing loop in t2～t3 operation time and Fig. 4 in Fig. 3
Accompanying drawing 5d: t4～t5 operation time current flowing loop in t3～t4 operation time and Fig. 4 in Fig. 3
Accompanying drawing 5e: t6～t7 operation time current flowing loop in t4～t5 operation time and Fig. 4 in Fig. 3
Accompanying drawing 5f: t7～t8 operation time current flowing loop in t5～t6 operation time and Fig. 4 in Fig. 3
1 two grades of DC power supply, 2 buck chopper current stabilization circuits, 3 current stabilization control circuits, 4 clamped circuit, 5 clamped voltage sources, 6 controlling circuit of voltage regulation, 7 short circuits and bridge arm direct pass protective circuit, 8 bipolar current pulse generators, 9 loads, 10 pulse control circuits.
Embodiment:
Below in conjunction with drawings and Examples, the present invention is described in further detail:
Multifunctional current impulse transmitter, by K switch, to connect buck chopper current stabilization circuit 2 by two grades of DC power supply 1 positive poles, clamped circuit 4, short circuit and bridge arm direct pass protective circuit 7, bipolar current pulse generator 8 is connected with load 9, current stabilization control circuit 3 is connected with buck chopper current stabilization circuit 2, clamped circuit 4 is connected with controlling circuit of voltage regulation 6 through clamped voltage source 5, two grades of DC power supply 1 negative poles are through buck chopper current stabilization circuit 2, bipolar current pulse generator 8 is connected with load 9, clamped voltage source 5 input negative poles are connected with buck chopper current stabilization circuit 2 output negative poles, pulse control circuit 10 is connected with bipolar current pulse generator 8, controlling circuit of voltage regulation 6 connects and composes with clamped circuit 4.
Buck chopper current stabilization circuit 2 comprises: diode D
1, IGBT manages VT
6, inductance L
1, capacitor C
1, current sampling resistor R
1, clamped circuit 4 comprises: diode D
2, IGBT and fly-wheel diode VT
5, clamped voltage source 5 is capacitor C, short circuit and bridge arm direct pass protective circuit 7 comprise: diode D
3, inductance L
2, bipolar current pulse generator 8 comprises: IGBT and fly-wheel diode VT
1, IGBT and fly-wheel diode VT
2, IGBT and fly-wheel diode VT
3, IGBT and fly-wheel diode VT
4, load 9 comprises: equivalent inductance L, equivalent resistance R; K switch one end is connected with two grades of DC power supply 1, the other end and diode D
1negative electrode and IGBT pipe VT
6collector electrode connects, diode D
1anode be connected with the negative pole of two grades of DC power supply 1, IGBT manages VT
6gate pole be connected with the output of current stabilization control circuit 3, inductance L
1one end and IGBT pipe VT
6emitter connect, the other end and capacitor C
1positive pole and diode D
2anodic bonding, current sampling resistor R
1one end be connected with the negative pole of two grades of DC power supply 1, other end capacitor C
1negative pole, negative pole, IGBT and the fly-wheel diode VT of capacitor C
2emitter, IGBT and fly-wheel diode VT
4emitter connect, current sampling resistor R
1output be connected with current stabilization control circuit 3, inductance L
2one end and diode D
2negative electrode, diode D
3negative electrode, IGBT and fly-wheel diode VT
5emitter connect, other end diode D
3anode, IGBT and fly-wheel diode VT
1collector electrode, IGBT and fly-wheel diode VT
3collector electrode connect, IGBT and fly-wheel diode VT
5collector electrode be connected with the positive pole of capacitor C, IGBT and fly-wheel diode VT
5gate pole be connected with the output of controlling circuit of voltage regulation 6, one end of load 9 and IGBT and fly-wheel diode VT
1emitter, IGBT and fly-wheel diode VT
2collector electrode connect, the other end and IGBT and fly-wheel diode VT
3emitter, IGBT and fly-wheel diode VT
4collector electrode connect, the output of pulse control circuit 10 and IGBT and fly-wheel diode VT
1～VT
4gate pole connect.
Multifunctional current impulse transmitter comprises six main current flowing states:
State one, output pulse current I
o(t) by forward maximum I
ombe reduced at 0 o'clock, comprise two current flowing loops: a negative pole → VT by load 9
3fly-wheel diode → diode D
3→ VT
5fly-wheel diode → capacitor C → VT
2the positive pole of fly-wheel diode → load, another is by diode D
3negative electrode → inductance L
2→ diode D
3anode;
State two, output pulse current I
o(t) by 0 be reduced to-I
o1time, comprise two current flowing loops: a positive pole → VT by capacitor C
5iGBT → inductance L
2→ VT
3iGBT → load 9 → VT
2the negative pole of IGBT → capacitor C, another is by diode D
3negative electrode → inductance L
2→ diode D
3anode;
State three, output pulse current I
o(t) by-I
o1slowly be reduced to-I
omaxtime, comprise a flow cycle: by capacitor C
1positive pole → diode D
2→ inductance L
2→ VT
3iGBT → load 9 → VT
2iGBT → capacitor C
1negative pole;
State four, output pulse current I
o(t) by-I
omaxbe increased at 0 o'clock, comprise two current flowing loops: a positive pole → VT by load 9
1fly-wheel diode → diode D
3→ VT
5fly-wheel diode → capacitor C → VT
4the negative pole of fly-wheel diode → load 9, another is by diode D
3negative electrode → inductance L
2→ diode D
3anode;
State five, output pulse current I
o(t) by 0, be increased to I
o1time, comprise two current flowing loops: a positive pole → VT by capacitor C
5iGBT → inductance L
2→ VT
1iGBT → load 9 → VT
4the negative pole of IGBT → capacitor C, another is by diode D
3negative electrode → inductance L
2→ diode D
3anode;
State six, output pulse current I
o(t) by I
o1slowly be increased to I
omaxtime, comprise a flow cycle: by capacitor C
1positive pole → diode D
2→ inductance L
2→ VT
1iGBT → load 9 → VT
4iGBT → capacitor C
1negative pole;
Multifunctional current impulse transmitter control method, comprises following order and step:
A, when load is equivalent inductance hundreds of μ H～mH, during the magnetic source of equivalent resistance 0.3～2 Ω, K switch is got to V
lshelves, when load is equivalent inductance 1mH～7mH, during the grounded source of equivalent resistance 10～80 Ω by the V that gets to of K switch
hshelves;
B, regulating impulse control circuit 10 drive signal, with the raw periodic current impulse of this drive bipolar current pulse generator 8;
C, adjusting controlling circuit of voltage regulation 6, current stabilization control circuit 3, making negative section 9 both end voltage is V
0(t), to flow through the current impulse of load 9 be I to Xiang Yingyou
0(t);
D, give the output V of buck chopper current stabilization circuit 2
iset a threshold voltage V the highest
imax, setting current stabilization value is I
g, work as VT
1, VT
4or VT
2, VT
3driving signal while being high level, detect and flow through inductance L
1average current I
i, average current I
iafter proportional integral is processed as subtrahend and minuend I
gask poor, then according to the size of difference, change the VT of IGBT
6duty ratio, adjusts output voltage, makes to flow through inductance L
1average current I
iequal the current stabilization value I setting
gif output voltage arrives the highest threshold voltage V setting
imaxtime do not reach preset setting current stabilization value I yet
g, regulate VT
6duty ratio make output voltage V
i=V
imax, realize the current stabilization of buck chopper current stabilization circuit 2 and control;
E, set a threshold voltage V to clamped voltage source 5
c1, the voltage in capacitor C is higher than V
c1time, meeting next VT
1, VT
4or VT
2, VT
3driving signal rising edge while coming, open VT
5in IGBT, until the voltage in capacitor C drops to V
c1time close VT
5in IGBT, realize the voltage stabilizing of clamped voltage source 5 and control;
F, when IGBT is when having electric current to flow through, the voltage difference V of collector and emitter
cecan increase along with the increase of current flowing the collector electrode while setting an IGBT conducting and the voltage difference V of transmitter
cemaximum threshold values V
cemax, when the H bridge generation output short-circuit in bipolar current pulse generator 8 or brachium pontis occur to lead directly to, detect VT
1-VT
4the voltage difference V of collector and emitter
ceif, VT
1-VT
4among the voltage difference V of any one collector and emitter under conducting state
cebe greater than maximum threshold values V
cemaxsurpass 1 μ s and with the time by 4 times of IGBT normal turn-off, turn-off IGBT, realize the control of short circuit and bridge arm direct pass protection.
1. for transient electromagnetic (TEM) and these two kinds of methods of time-domain induced polarization (TIP), in load, output current is 50% duty ratio bipolar square wave, and in one-period, current impulse has following features:
At t
0～t
1during this time, by load 9 both end voltage V
o(t
0～t
1) clamped arrive-V
c, make to flow through the current impulse I of load 9
o(t) fast-descending, through I after a period of time
o(t
1)=0, current flowing loop is as shown in Figure 5 a;
At t
1～t
2during this time, load 9 both end voltage V
o(t
1～t
2)=0, current impulse I
o(t
1～t
2)=0;
At t
2～t
3during this time, by load 9 both end voltage V
o(t
2～t
3) clamped arrive-V
c, make to flow through the current impulse I of load 9
o(t) fast-descending, through I after a period of time
o(t
3the I of)=-
o1, current flowing loop as shown in Figure 5 b;
At t
3～t
4during this time, by load 9 both end voltage V
o(t
3～t
4) clamped arrive-V
i, make to flow through the current impulse I of load 9
o(t) slowly reduce, through I after a period of time
o(t
4the I of)=-
omax, current flowing loop as shown in Figure 5 c;
At t
4～t
5during this time, by load 9 both end voltage V
o(t
4～t
5) clamped to V
c, make to flow through the current impulse I of load 9
o(t) fast rise, through I after a period of time
o(t
5)=0, current flowing loop is as shown in Fig. 5 d;
At t
5～t
6during this time, load 9 both end voltage V
o(t
5～t
6)=0, current impulse I
o(t
5～t
6)=0;
At t
6～t
7during this time, by load 9 both end voltage V
o(t
6～t
7) clamped to V
c, make to flow through the current impulse I of load 9
o(t) fast rise, through I after a period of time
o(t
7)=I
o1, current flowing loop is as shown in Fig. 5 e;
At t
7～t
8during this time, by load 9 both end voltage V
o(t
7～t
8) clamped to V
i, make to flow through load 9 current impulse I
o(t) slowly increase, through I after a period of time
o(t
8)=I
omax, current flowing loop is as shown in Fig. 5 f;
Wherein:
T
0: output current pulse I
o(t) from I
omaxstart the moment declining,
T
1: output current pulse I
o(t) drop to moment of 0,
T
2: output current pulse I
o(t) since 0 moment declining,
T
3: output current pulse I
o(t) drop to-I
o1the moment,
T
4: output current pulse I
o(t) arrive-I of slow decreasing
omaxthe moment,
T
5: output current pulse I
o(t) rise to moment of 0,
T
6: output current pulse I
o(t) since 0 moment of rising,
T
7: output current pulse I
o(t) rise to I
o1the moment,
T
8: output current pulse I
o(t) slowly rise to I
omaxthe moment,
2. for controllable source audio-frequency magnetotelluric magnetic method (CSAMT) method, in load, output current is 100% duty ratio bipolar square wave, and in one-period, current impulse has following features:
At t
0～t
1during this time, by load 9 both end voltage V
o(t
0～t
1) clamped arrive-V
c, make to flow through the current impulse I of load 9
o(t) fast-descending, through I after a period of time
o(t
1)=0, current flowing loop is as shown in Figure 5 a;
At t
1～t
2during this time, by load 9 both end voltage V
o(t
1～t
2) clamped arrive-V
c, make to flow through the current impulse I of load 9
o(t) fast-descending, through I after a period of time
o(t
3the I of)=-
o1, current flowing loop shows as Fig. 5 b;
At t
2～t
3during this time, by load 9 both end voltage V
o(t
2～t
3) clamped arrive-V
i, make to flow through the current impulse I of load 9
o(t) slowly reduce, through I after a period of time
o(t
3the I of)=-
omax, current flowing loop shows as Fig. 5 c;
At t
3～t
4during this time, by load 9 both end voltage V
o(t
3～t
4) clamped to V
c, make to flow through the current impulse I of load 9
o(t) fast rise, through I after a period of time
o(t
4)=0, current flowing loop is as shown in Fig. 5 d;
At t
4～t
5during this time, by load 9 both end voltage V
o(t
4～t
5) clamped to V
c, make to flow through the current impulse I of load 9
o(t) fast rise, through I after a period of time
o(t
5)=I
o1, current flowing loop is as shown in Fig. 5 e;
At t
5～t
6during this time, by load 9 both end voltage V
o(t
5～t
6) clamped to V
i, make to flow through load 9 current impulse I
o(t) slowly increase, through I after a period of time
o(t
8)=I
omax, current flowing loop is as shown in Fig. 5 f;
Wherein:
T
0: output current pulse I
o(t) from I
omaxstart the moment declining,
T
1: output current pulse I
o(t) drop to moment of 0,
T
2: output current pulse I
o(t) drop to-I
o1the moment,
T
3: output current pulse I
o(t) arrive-I of slow decreasing
omaxthe moment,
T
4: output current pulse I
o(t) rise to moment of 0,
T
5: output current pulse I
o(t) rise to I
o1the moment,
T
6: output current pulse I
o(t) slowly rise to I
omaxthe moment.
Claims (1)
1. a Multifunctional current impulse transmitter control method, is characterized in that, comprises the following steps:
A, when load is equivalent inductance hundreds of μ H-2mH, during the magnetic source of equivalent resistance 0.3～2 Ω, K switch is got to DC power supply V
lshelves, when load is equivalent inductance 1mH～7mH, get to DC power supply V by K switch during the grounded source of equivalent resistance 10～80 Ω
hshelves;
B, regulating impulse control circuit (10) produce and drive signal, with this drive bipolar current pulse generator (8), produce periodic current impulse;
C, adjusting controlling circuit of voltage regulation (6), current stabilization control circuit (3), making load (9) both end voltage is V
o(t), to flow through the current impulse of load (9) be I to Xiang Yingyou
o(t);
D, the output voltage V of giving buck chopper current stabilization circuit (2)
iset high threshold voltage V
imax, setting current stabilization value is I
g, VT
1-VT
4for the switching device in bipolar current pulse generator (8), VT
5for the switching device in clamped circuit (4), VT
6for the switching device in buck chopper current stabilization circuit (2), switching device VT
1-VT
6respectively comprise an IGBT pipe and a reverse parallel connection diode, work as VT
1and VT
4middle IGBT pipe or VT
2and VT
3when the driving signal of middle IGBT pipe is high level, detects and flow through inductance L
1average current I
i, average current I
iafter proportional integral is processed as subtrahend and minuend I
gask poor, then according to the size of difference, change VT
6the duty ratio of middle IGBT pipe, adjusts output voltage, makes to flow through inductance L
1average current I
iequal the current stabilization value I setting
gif, the high threshold voltage V that output voltage arrive to be set
imaxtime do not reach preset setting current stabilization value I yet
g, regulate VT
6the duty ratio of middle IGBT pipe makes output voltage V
i=V
imax, realize the current stabilization of buck chopper current stabilization circuit (2) and control;
E, set a threshold voltage V to clamped voltage source (5)
c1, the voltage in capacitor C is higher than V
c, meeting next VT at 1 o'clock
1and VT
4middle IGBT pipe or VT
2and VT
3when the driving signal rising edge of middle IGBT pipe comes, open VT
5middle IGBT pipe, until the voltage in capacitor C drops to V
cclose VT at 1 o'clock
5middle IGBT pipe, realizes the voltage stabilizing of clamped voltage source (5) and controls;
F, work as VT
1-VT
4middle IGBT pipe when having electric current to flow through, the voltage difference V of collector and emitter
cecan increase along with the increase of current flowing the collector electrode while setting an IGBT pipe conducting and the voltage difference V of emitter
cemaximum threshold V
cemax, when the H bridge generation output short-circuit in bipolar current pulse generator (8) or brachium pontis occur to lead directly to, detect VT
1-VT
4the voltage difference V of the collector and emitter of middle IGBT pipe
ceif, VT
1-VT
4among the voltage difference V of any one IGBT pipe collector and emitter under conducting state
cebe greater than maximum threshold V
cemaxsurpass 1 μ s, with the time of four times of IGBT pipe normal turn-off, turn-off IGBT pipe, realize the control of short circuit and bridge arm direct pass protection.
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|---|---|---|---|
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|---|---|---|---|
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| CN103701354B (en) * | 2013-12-28 | 2015-12-30 | 吉林大学 | There is grounded source transmitter installation and the control method of self adaptation dummy load |
| CN104135166B (en) * | 2014-07-14 | 2017-01-11 | 西南交通大学 | AC/DC power supply having adjustable high-power pulse edge time |
| US10721687B2 (en) * | 2015-12-17 | 2020-07-21 | Wits Co., Ltd. | Information transmitter and an apparatus including the same |
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| CN201146485Y (en) * | 2008-01-21 | 2008-11-05 | 重庆大学 | Frequency domain electromagnetism emitting apparatus for generating wide-band constant-amplitude AC rectangular wave current |
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