CN1206960A - Method and device for controlling switch thyristor - Google Patents
Method and device for controlling switch thyristor Download PDFInfo
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- CN1206960A CN1206960A CN 98116174 CN98116174A CN1206960A CN 1206960 A CN1206960 A CN 1206960A CN 98116174 CN98116174 CN 98116174 CN 98116174 A CN98116174 A CN 98116174A CN 1206960 A CN1206960 A CN 1206960A
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Abstract
The invention provides a method for turning on and turning off a GTO and a corresponding control circuit. A conducting current and a holding current are generated from a voltage pulse, and are cinverted into current by means of an electric power memory. When a necessary current is obtained from a same power source or a same power memory, the circuit technic is very advantageous for generating a pulse necessary for cutting off the current. The holding current is preferably produced by repetition of the voltage pulse. The repetition frequency of the voltage pulse can be rised or reduced based on require. Especially when a voltage of a gate-cathode is negative, the frequency is reduced to be rised again when a positive is updated.
Description
The present invention relates to field of power electronics.According to the described method and apparatus that relates to the turn-on and turn-off of GTO of the preamble of independent claims.
Described method and apparatus is known from European patent application EP 0 489 945 A1.Compare with traditional control, be used to turn-off higher and a lot of current delivery of GTO to grid.Also contain the device that produces the conducting electric current in addition.This device produces the electric current of conducting GTO and keeps the holding current of conducting state.This device contains a plurality of capacitors, is stored with essential energy and discharges according to required by switch.
There not being disclosed German patent application document number is to disclose the space structure that is used for described control device in 19708873.2 in addition.In order to realize rigid control, this device has very low inductance.For this reason in not having disclosed German patent application the suggestion this device be directly arranged in GTO near.
Yet wish to have a control circuit generally speaking, its expense with the least possible circuit engineering and saving is with current transformer that can the implementation structure compactness.
Therefore task of the present invention is that it needs less space and energy, the suitable expense of especially rigid control method to discharge control method and corresponding circuit arrangement.This task realizes by the feature of dependent claims.
Core of the present invention is, conducting electric current and holding current are produced by potential pulse, and it changes electric current into by means of the electric flux memory.Circuit engineering is especially favourable, because produce essential potential pulse from same power supply or same energy accumulator, as the pulse that produces cut-off current.This holding current is favourable pass through potential pulse repeat produce.The repetition rate of this potential pulse can be distinguished rising as required or reduce.Especially when grid-cathode voltage when negative, this frequency reduces, so that can raise again under the situation of new positive voltage.
In control circuit of the present invention, this turning circuit has at least one electric flux memory, and it is converted to electric current with potential pulse.Exist of the transmission of an energy accumulator that is used for the general energy accumulator of conducting electric current and holding current or separates to be connected or capacitive connects realization by perception from the energy accumulator of breaking circuit to the essential energy of the energy accumulator of turning circuit.Especially advantageously under the situation of control circuit, essential logical circuit and power supplies other devices are based on the energy accumulator of selected breaking circuit.
By method of the present invention and corresponding device thereof, it is extremely low that the expense of circuit engineering can keep.The operating efficiency of this circuit arrangement is very high, thus control circuit can be located at GTO very nearby, and can keep desired little inductance.
Other advantageous embodiment provides at corresponding dependent claims.
Following the present invention explains in conjunction with the accompanying drawings in detail by embodiment.
Figure is:
The circuit diagram of Fig. 1 first embodiment of the invention,
The circuit diagram of Fig. 2 second embodiment of the invention,
The circuit diagram of Fig. 3 third embodiment of the invention,
The circuit diagram of Fig. 4 fourth embodiment of the invention,
Fig. 5 potential pulse and describe with the signal of the electric current that this was produced,
The circuit diagram of Fig. 6 fifth embodiment of the invention.
Used in the accompanying drawings reference symbol is unified in the reference symbol table to list with being marked at.Part identical in the accompanying drawing is used identical reference symbol.
Fig. 1 shows the circuit diagram of the control circuit that is used for switch thyristor 14.Marked with 50 and 51 and to have had for example positive and negative gate terminal of the voltage source of 20V output voltage.From then on voltage source is to energy accumulator 3 power supplies that belong to breaking circuit.This memory 3 is especially realized with the form of electrolytic capacitor group.This control circuit contains breaking circuit and turning circuit.This breaking circuit mainly constitutes by turn-offing logical circuit 1, energy accumulator 3 and switch 4.Switch 4 is linked the grid of GTO14 and energy accumulator 3 and its and is turned off logical circuit 1 control.This turn-offs logical circuit 1 preferably by series controller 2 (the general voltage regulator of using) power supply.This breaking circuit 1 for example receives control signal by the optical fiber that arrow marked and the transistor in left side that turn-offs the block diagram of logical circuit 1.By the voltage of instruction on logical circuit 1 amplification and formation switch 4 that is used for turn-offing GTO 14 that optical fiber sent, so that it begins conducting.From the grid of GTO14, draw an electric current with this.Therefore the grid of GTO is born with respect to negative pole, and GTO turn-offs.This switch 3 especially also contains the parallel circuits of a MOSFET.Similar, energy accumulator 3 is made up of many ELKO parallel with one another.
Contain a turning circuit in addition.It contains a turn-on logic circuit 5, and it is similar by energy accumulator 3 power supplies to shutoff logical circuit 1.Corresponding series controller marks with 6.Two logical circuits 1 and 5 interconnect according to signal.Receive the instruction of turn-offing GTO if turn-off logical circuit 1, then stop the starting of turn-on logic circuit 5 in this way.If logical circuit 1 receives a turn-on command, then this turn-on logic circuit 5 makes the switch of being controlled by it 7 be operated in switching mode.Switch 7 is located between terminal 50 and 51.The potential pulse of Chan Shenging is transferred to rectifier diode 10 by means of the converter 8,9 of connecting with switch 7 in this way, and it is by the electric flux memory, preferably by inductance 12 power supplies.In order to keep all devices to reach desirable low inductance, the inductance of converter 8,9 is less than inductance 12.This can reach as follows, coil 8,9 integrated on printed circuit board (PCB) and with the magnetic core magnetic coupling.The conductor bar that also can be used as on the printed circuit board (PCB) according to the size of required inductance 12 carries out integrated respectively.Inductance 12 links to each other with the grid of GTO by another switch 13.Switch 13 separates turning circuit when turn-offing, and separates with the grid of GTO under off state.
Fig. 5 shows the potential pulse VT by converter 8,9 transmission.Potential pulse carries out rectification and is converted to electric current at inductance 12 by diode 10 at secondary side.Be diverted by 11 these electric currents of the unloaded diode between positive terminal 50 and the negative pole.The electric current that flows through inductance 12 is at the first approximate triangle of locating to have as shown in Figure 5.GTO for 3kA, 4.5kV needs 200A to turn-off to 400A, and it should keep 5 to 15 μ s.Obtain the exemplary value of the inductance 12 in the 100nH scope thus.GTO14 also needs the holding current of a hope after conducting, to keep the state of conducting.The simplest implementation method is that described conducting pulse repeats with the frequency f of determining 1.
It is very different being used to start with being used to keep the amount of circuitry of starting state.Starting for GTO needs high power, for example about 200A, and holding current only need about 2A.Thus advantageously, can produce the holding current that has less than the power of the repetition of conducting pulse.Fig. 2 shows the embodiment that obtains this result.It contains second inductance 24, and it is powered through second utmost point winding 20 by converter equally.Rectifier diode marks with 21, and unloaded diode marks with 23.Favourable be connected with the electric capacity 23 in parallel with unloaded diode 22.This electric capacity 23 can carry out energy reception slowly, so that can keep less repetition rate and equally can satisfy holding current.Can guarantee greater than inductance 12 with this inductance 24, for example in the scope of 10 to 50 μ H.Also can contain a suitable converter and suitable logical circuit and replace utmost point winding 22 second time.Under the situation that separately produces conducting pulse and holding current, switch 13 carries out conducting according to the starting of GTO14, so that inductance 12 separates with grid.
Under the situation that separately produces holding current, between the grid of GTO14 and negative electrode, has active electric current rise limitation device 25,26.This device contains the transistor 26 that is useful on the restriction holding current, and it is on the current path that is connected under the situation of Fig. 2 between turning circuit and the negative electrode.Preferably, this circuit has a bipolar transistor 26 and base series resistor 25.This device has stoped holding current uncrossed rising under the situation of negative grid-cathode voltage.Diode current flow when cathode voltage, and this electric current rises in the clear.This can stop effectively by device of the present invention.
Produce the necessary potential pulse of holding current can be not by the second time utmost point winding directly on the commutating voltage of diode 10, obtain.Fig. 3 shows respective embodiments.Common node between rectifier diode 10 and the unloaded diode 11 links to each other with second inductance 24.Electric current rise limitation device uses symbol 27 to represent bipolar diodes and 28 to represent series resistance.In this embodiment, diode uses opposite polarity, and transistor 27 is connected on the grid current path.Basic and shown in Figure 2 identical of the functional mode of present embodiment.Its effect is as follows: under the situation of positive grid-cathode voltage, the electric current of inductance 4 is divided into the base current and the collector current of transistor 27.This base current makes transistor turns.Directly link to each other with this inductance 24 with the grid of GTO 14.Begin to regulate transistor under the situation of negative grid-cathode voltage: if this transistor can access collector current, then its emitter must have conducting voltage, that is to say than base stage to exceed about 0.7V.Yet the first approximate inductance 24 that is considered as current source is operated on the opposite voltage always.That is to say GTO14 in case need opposite work, this collector voltage just becomes negative.Although the electric current major part of inductance 24 flows through emitter-collector electrode.This electric current is effectively limited, because transistor is by adjusting condition U
Ein=U
EB+ U
RStop.U
EinThe voltage on the inductance, U have been marked at this
EBBe emitter base voltage, and U
RIt is the voltage drop of base series resistor.The device of Fig. 2 is replaced the pnp-transistor of being explained 27 with identity function by npn-transistor 26.
Also can divide inductive coupled by means of transistor by capacitive coupling replacement with capacitor.Fig. 4 shows respective embodiments.Turn-on logic circuit 5a is controlled at the transistor 31 and 30 between terminal 50 and 51.Transistor 31 produces positive potential pulse, and transistor 30 is opposite.The potential pulse that is produced continues to be transferred to rectifier diode 10 by coupling capacitance 32.Contain a feedback diode 33 in addition, it is located between the negative electrode and rectifier diode 10 of voltage source GTO or positive terminal 50.The general utility functions mode of the circuit of Fig. 4 is as above narration.
Fig. 6 shows the embodiment of the starting current of auxiliary generation breaking circuit of the present invention.For the sake of clarity, logical circuit 1 and 5 is in this not expression.The function of this circuit is as follows: before turn-offing the transistor obstruction, load transistor 36 stops a dynamic inductance 35 that can turn-off by positive terminal 50.Form electric current then in inductance 35, it directly is transformed into grid after switch 4 blocks, and forms needed start pulse.Inductance 35 can so be selected: form electric current in 5 to 10 μ s.Obstruction is connected on inductance 35 loading-diode 37 before then, and loading-diode can be repeated to turn-off.When switch 36 before electric current descends during conducting, energy remaining feeds back to energy accumulator 3 by unloaded diode 38.Can produce especially short and start pulse in full force and effect in this way.The part that being used to of turning circuit produces holding current can constitute in described mode, and perhaps this essential energy is transferred to energy accumulator 24 from energy accumulator 3 by means of the conducting by switch 7 of memory inductance 34 and rectifier diode 21.In order to turn-off GTO14, draw an electric current from grid by starting switch 14.
Provide the different energy couplings and the distortion of storage in the above description, though it makes an explanation in an accompanying drawing, can at random make up naturally, this emphasis according to circuit engineering carries out.
Control circuit of the present invention and control method based on this can reduce the repetition rate f1 or the width of the potential pulse that is used for holding current, as long as negative grid-cathode voltage occurs on GTO.Next, the loss that occurred on the bipolar transistor in electric current rise limitation device reduces, especially under the situation of the GTO of maximum power, that is to say need a high holding current (＞1A).After the grid of GTO and the positive voltage between the negative electrode repeated to set up, repetition rate or pulse duration improved again.Can access higher grid current with this, guarantee the inverse transformation at interval that do not have of GTO with this.Therefore with the re-lighting pulse of traditional form become more than.This has also eliminated the danger and with the accurate detection of orthochronous point re-lighting relevant problems of all of re-lighting pulse in the time point appearance of mistake.Also can improve the EMV-interference free performance of this device in addition in this way.Very general is that grid current can be set up by the repetition rate of potential pulse or the influence of pulse duration.
Explained that as being used for the necessary pulse of cut-off current, the potential pulse that equally produces conducting electric current or holding current produced from same energy accumulator 3.This circuit also can so constitute, and this turning circuit contains a suitable voltage source.Converter 8,9 can remove in the case, needs another power line and another energy accumulator at least for this reason.
Generally speaking, method of the present invention and have compact, structure firm and low inductance based on this control circuit, especially particularly advantageous is the GTO that is used for rigid control.This control unit can be directly arranged near the of GTO and set up compact especially current regulator thus.The operating efficiency of this device is very high.This control device as the beginning do not have construct as described in the disclosed German patent application.The control device that device given herein is made mistakes for replacement is very favorable.
35 dynamic inductances of secondary coil 21 commutation diodes, 22 unloaded diode 23 memory capacitor 24 memory inductance, 25 base resistance 26 bipolar transistors, 27 bipolar transistor 28 base resistances, 30 switch 31 switches, 32 coupling capacitance 33 feedback diodes, 34 memory inductance, 36 load transistors, 37 loading-diodes, the 38 unloaded diode 50 positive terminals 51 negative terminal U of secondary coil 10 commutation diodes 11 unloaded diode 12 memory inductance 13 switches 14 GTO 20 converters of primary coil 9 converters of reference symbol table 1 shutoff logic circuit 2 series controllers 3 energy accumulators, shutoff capacitor group 4 switches 5,5a turn-on logic circuit 6 series controllers 7 switches 8 convertersEBEmitter base voltage URThe voltage U at resistance 27 placesTThe voltage I at unloaded diode 22 placesGGrid current
Claims (11)
1. the control method that is used for turn-on and turn-off switch thyristor (14) contains and has the following steps:
(a) produce the cut-off current that is used for the stopcock thyristor,
(b) produce the conducting electric current that is used for the actuating switch thyristor,
(c) produce and to make the switch thyristor remain on the holding current of conducting state,
It is characterized in that,
(d) conducting electric current and holding current are produced by potential pulse, and this pulse converts electric current to by means of at least one electric flux memory (12,23,24,35).
2. method as claimed in claim 1 is characterized in that this holding current is produced by sequence of voltage pulses.
3. method as claimed in claim 2 is characterized in that, this holding current is that the repetition by the potential pulse that is used to produce the conducting electric current produces.
4. as the method for claim 2 or 3, it is characterized in that this sequence of voltage pulses has repetition rate f1, wherein, negative grid-cathode voltage occurs in case switch thyristor (14) is gone up, then f1 reduces.
5. method as claimed in claim 4 is characterized in that, in case go up the positive grid-cathode voltage of appearance at switch thyristor (14), then the repetition rate f1 of potential pulse raises.
6. the control circuit that is used for turn-on and turn-off switch thyristor (14), wherein, this control circuit contains a breaking circuit and a turning circuit, and be located between the gate terminal and cathode terminal of switch thyristor (14), and this turning circuit is in order to produce starting current and to make switch thyristor (14) remain on the holding current of conducting state and constitute, it is characterized in that, this turning circuit contains at least one electric flux memory (12,23,24), and this potential pulse converts conducting electric current and holding current to.
7. method as claimed in claim 6, it is characterized in that, this breaking circuit contains the energy accumulator (3) of a capacitive, obtain being used to produce the energy of cut-off current by means of first switch (4) from this memory, this turning circuit contains a second switch (7) and at least one converter (8,9,20) or a coupling capacitance (32), as generation conducting electric current and holding current, potential pulse obtains and is fed to the electric flux memory (12,23,24) of turning circuit from this energy accumulator (3).
8. method as claimed in claim 7 is characterized in that, the electric flux memory of turning circuit (12,23,24) contains first inductance (12), and it is connected to the grid of switch thyristor (14) by the 3rd switch (13).
9. method as claimed in claim 8, it is characterized in that, the electric flux memory of this turning circuit (12,23,24) contains one second inductance (24) and an electric capacity (23) that is in parallel with unloaded diode (22), this inductance (24) is connected to the grid of switching transistor, and the electric current rise limitation device (25,26,27,28) that can turn-off is connected between the grid and negative electrode of switch thyristor.
10. method as claimed in claim 9 is characterized in that, this converter (8,9,20) contain inferior utmost point winding (9) first, that be first inductance (12) power supply and second, be the secondary winding that second inductance (24) is powered.
11. method as claimed in claim 6, it is characterized in that, this breaking circuit contains the energy accumulator (3) of a capacitive, obtain being used to produce the energy of cut-off current by means of first switch (4) from this memory, this turning circuit contains a second switch (7) and a memory inductance (34), as the generation holding current, from energy accumulator (3), produce sequence of voltage pulses, and this sequence of voltage pulses is fed to the electric flux memory (12 of turning circuit, 24), and in order to produce starting current, this turning circuit contains a dynamic inductance (35) that can turn-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116174 CN1206960A (en) | 1997-07-24 | 1998-07-24 | Method and device for controlling switch thyristor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19731836.3 | 1997-07-24 | ||
| CN 98116174 CN1206960A (en) | 1997-07-24 | 1998-07-24 | Method and device for controlling switch thyristor |
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| Publication Number | Publication Date |
|---|---|
| CN1206960A true CN1206960A (en) | 1999-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98116174 Pending CN1206960A (en) | 1997-07-24 | 1998-07-24 | Method and device for controlling switch thyristor |
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| CN (1) | CN1206960A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424679A (en) * | 2012-05-22 | 2013-12-04 | Ls产电株式会社 | Apparatus for testing thyristor valve |
-
1998
- 1998-07-24 CN CN 98116174 patent/CN1206960A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424679A (en) * | 2012-05-22 | 2013-12-04 | Ls产电株式会社 | Apparatus for testing thyristor valve |
| US9310421B2 (en) | 2012-05-22 | 2016-04-12 | Lsis Co., Ltd. | Apparatus for testing thyristor valve |
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