CN1022600C - IF power supply asymmetric starting of parallel inverter thyristors and controlling thereof - Google Patents
IF power supply asymmetric starting of parallel inverter thyristors and controlling thereof Download PDFInfo
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- CN1022600C CN1022600C CN 91102443 CN91102443A CN1022600C CN 1022600 C CN1022600 C CN 1022600C CN 91102443 CN91102443 CN 91102443 CN 91102443 A CN91102443 A CN 91102443A CN 1022600 C CN1022600 C CN 1022600C
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- starting
- thyristor
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- trigger
- impulse
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Abstract
The present invention provides an asymmetrical starting method and a control method of a parallel inversion thyristor intermediate frequency power supply, which relates to the medium frequency power supply. In the starting process of the method, an inversion thyristor is controlled by a three-bridge arm asymmetrical triggering which is later changed into four-bridge arm symmetrical triggering; the inversion thyristor control is realized by a pulse controller arranged in a control circuit; during the starting, a symmetrical triggering pulse is blocked, and a pulse is sent to trigger a thyristor of three bridge arms of an inversion bridge; after the starting is completed, the blockage is removed, the pulse sending is stopped, and the symmetrical triggering control is in the normal operation. The start method of the present invention effectively improves the inversion capability of an inverter, and has the advantages of high starting success ratio and high load adaptability.
Description
The present invention relates to parallel inverter thyristor intermediate frequency power supply device.
The parallel inverter thyristor intermediate frequency power supply be with industrial-frequency alternating current through rectification, filtering, be reverse into voltage of intermediate frequency by shunt chopper again, for the device of load-sensing heating, (see figure 1).During work, the trigger impulse of inverter thyristor is the intermediate-freuqncy signal u by inverter output
sForm circuit through symmetrical trigger impulse and produce, trigger impulse satisfies symmetrical trigger condition, i.e. diagonal angle brachium pontis (S
1, S
4) or (S
2, S
3) must trigger simultaneously, and the alternate turns conducting, 180 ° of their triggering phase place mutual deviations, for guaranteeing the inverter reliably working, thyristor bears the time t of back-pressure
fShould be all the time greater than thyristor turn-off time t
q, (as Fig. 4) like this, works as S
1, S
4Triggering and conducting, after the change of current, S
2, S
3The energy reliable turn-off, vice versa.The starting process of this intermediate frequency power supply, be exactly to load L, the continuous intake of the C parallel resonance tank circuit, make it to set up gradually the process of resonance potential, starting method commonly used at present has two kinds: one, precharge enable method, and the primary power of this method starting is from precharge electric capacity, therefore need the huge auxiliary circuit of a cover, increased cost, in a period of time in the starting process, resonant groove path terminal voltage U
cVery low with respect to steady state working voltage, so change of current ability of inverter at this moment, not only commutation course is slow, and be subjected to the influence of filter magnetic energy after the change of current, resonant groove path voltage will comparatively fast change direction, thyristor occur and bear anti-pressure time less than the turn-off time, make the thyristor just out of service can not reliable turn-off and cause starting failure, for low-impedance load, start more difficult especially.Two, pre-magnetizing method of starting, it is the storage element of the filter reactor of use device as primary power itself, though it is less relatively to start required auxiliary element, but with the same reason of above-mentioned preliminary filling electrical method, cause starting difficulty, especially lower frequency range (2.5K～10KHz), especially true, so its application has been subjected to considerable restraint.
Purpose of the present invention is intended to improve the starting performance of parallel inverter thyristor intermediate frequency power supply, it is few to propose the required auxiliary element of a kind of starting, cost is low, and the adaptive load ability is strong, and in whole intermediate frequency range (method and the control thereof of 0.5K～10KHz) all can reliably start.
The starting method that the present invention proposes is: in starting process the asymmetric triggering of three brachium pontis is adopted in the triggering of inverter thyristor, promptly wouldn't be triggered a certain thyristor in the inverter bridge earlier, to prolong thyristor negative voltage duration t
f, make thyristor bear the time t of back-pressure
fAll the time greater than turn-off time t
q, guarantee reliably starting, treat that the intermediate frequency power supply device starts after, the four brachium pontis symmetry when making inverter thyristor transfer normal operation again to triggers control.
For realizing this method of starting, generally can in control circuit, set up impulse controller, by it symmetrical start pulse signal is enforced a blockade during starting, and send pulse, trigger the thyristor of three brachium pontis of inverter bridge, starting finishes, and then lifts a blockade, stop paying out pulse, the four brachium pontis symmetry when at this moment inverter thyristor transfers normal the operation to triggers state of a control.This impulse controller can be made of single chip microcomputer or other microsystems.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is a parallel inverter thyristor intermediate frequency power supply principle assumption diagram; 1 is three-phase full-controlled rectifier bridge among the figure, and 2 is filter reactor, and 3 is by thyristor S
1～S
4The shunt chopper that constitutes, 4 are load.
Fig. 2 is the control principle figure of inverter thyristor trigger impulse.
Asymmetric trigger impulse of three brachium pontis thyristors and voltage waveform thereof when Fig. 3 is starting.
Four brachium pontis thyristors symmetry trigger impulse and voltage waveform thereof when Fig. 4 is operation.
Fig. 5 is a kind of embodiment of the present invention.
With reference to Fig. 2, the control circuit of inverter thyristor trigger impulse comprises that symmetrical trigger impulse forms circuit 5, and power amplifier 6 and impulse controller 7 are in the starting process, as the terminal voltage U of the load parallel resonance tank circuit
cWhen being lower than steady state working voltage, by impulse controller symmetrical trigger impulse being formed circuit and block, and send pulse by three brachium pontis triggering modes, this pulse removes to trigger corresponding thyristor after amplifying circuit amplifies.The waveform that the order of trigger impulse and thyristor bear back-pressure is seen shown in Figure 3, establishes thyristor S
2Wouldn't trigger, Fig. 3 (d) (e) is respectively thyristor S
3And S
1, S
4Trigger impulse, Fig. 3 (a) (b), (c) is respectively thyristor S
1, S
4, S
3And S
2Bear the oscillogram of back-pressure, the frequency of its trigger impulse can be selected by the principle identical with general separate excitation mode.Because the asymmetric triggering starting of this three brachium pontis has the inversion cycle half, load is in free-running operation, therefore makes the terminal voltage U of the load parallel resonance tank circuit
CReverse procedure is slack-off, has just obtained balance preferably like this between energy injection and forced oscillation, has increased thyristor and has born the time t of back-pressure
f, realized making thyristor to bear anti-pressure time t
fAll the time greater than turn-off time t
q, help improving starting performance, improve the starting success rate.Terminal voltage U when the load parallel resonance tank circuit
CIncrease near or when reaching steady state working voltage, then impulse controller is lifted a blockade, and stops paying out pulse, the four brachium pontis symmetry when at this moment the trigger impulse of inverter thyristor transfers normal operation to triggers control, promptly trigger impulse is by intermediate-freuqncy signal u
sAmplify through symmetrical trigger impulse formation circuit generation and by power amplifier.The waveform that its trigger impulse and thyristor bear back-pressure as shown in Figure 4, Fig. 4 (c) (d) is respectively thyristor S
1, S
4And S
2, S
3Trigger impulse, Fig. 4 (a) (b) is respectively thyristor S
1, S
4And S
2, S
3Bear the oscillogram of back-pressure.
Because single-chip microprocessor system has control flexibly, accurately, be convenient to design, advantages such as good in anti-interference performance, therefore realize that as impulse controller above-mentioned trigger impulse control to inverter thyristor is a desirable approach with single-chip microprocessor system, what Fig. 5 provided is a kind of with the example of single-chip microprocessor system as impulse controller.During starting, single-chip microcomputer 8031 is by the program that is solidificated among the EPROM2732, by latch 74LS273(II) and the light isolation link send the asymmetric inversion trigger impulse of three brachium pontis P, this group signal is directly through power amplifier (6), drive corresponding thyristor, single-chip microcomputer is also exported one road locking signal O simultaneously, and the monostable trigger-action circuit CD4538 that symmetrical trigger impulse is formed in the circuit (5) does not work.After getting up, single-chip microcomputer is then removed this blockade, and stops paying out inversion trigger impulse P, and inverter thyristor trigger impulse is at this moment sent by circuit (5).
Starting method of the present invention, because the asymmetric triggering of inverter bridge three brachium pontis can be chosen in change of current condition in the worst time period, i.e. load tank circuit terminal voltage U
CHave an effect when minimum, so can improve the change of current ability of inverter effectively, improve starting performance, at very big frequency range (0.5K～10KHz) and very high-power scope (50KW～500KW) all can frequently reliably start to rated current and the arbitrary load below the rated current, the present invention is simple in structure, required auxiliary element is few, and cost significantly reduces.
Claims (3)
1, the asymmetric method of starting of parallel inverter thyristor intermediate frequency power supply, when it is characterized in that starting to inverter thyristor [S
1～S
4] triggering, adopt the asymmetric triggering of three brachium pontis, wait to start the four brachium pontis symmetry that transfers when operation to that finishes and trigger control.
2, be exclusively used in the control circuit of the described method of starting of claim 1, contain symmetrical trigger impulse and form circuit (5), power amplifier (6), intermediate-freuqncy signal u
sInverter thyristor (S when conduct moves after the pulse that symmetrical trigger impulse formation circuit (5) produces is amplified by power amplifier (6)
1～S
4) symmetry trigger control signal, it is characterized in that also being provided with in the control circuit impulse controller (7), during starting, by impulse controller symmetrical trigger impulse being formed circuit (5) blocks, and send pulse by three brachium pontis triggering modes, this pulse removes to trigger corresponding thyristor after amplifying circuit (6) amplifies, starting finishes, and impulse controller is lifted a blockade and stopped paying out pulse.
3, by the described control circuit of claim 2, it is characterized in that said impulse controller is a single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102443 CN1022600C (en) | 1991-04-16 | 1991-04-16 | IF power supply asymmetric starting of parallel inverter thyristors and controlling thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102443 CN1022600C (en) | 1991-04-16 | 1991-04-16 | IF power supply asymmetric starting of parallel inverter thyristors and controlling thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065956A CN1065956A (en) | 1992-11-04 |
| CN1022600C true CN1022600C (en) | 1993-10-27 |
Family
ID=4905603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102443 Expired - Fee Related CN1022600C (en) | 1991-04-16 | 1991-04-16 | IF power supply asymmetric starting of parallel inverter thyristors and controlling thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022600C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638157A (en) * | 2012-05-02 | 2012-08-15 | 株洲南车时代电气股份有限公司 | Unit H-bridge module bypass circuit of chain type static synchronous compensator (STATCOM) |
-
1991
- 1991-04-16 CN CN 91102443 patent/CN1022600C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1065956A (en) | 1992-11-04 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |