CN102006009B - Internal freewheeling type constant energy chopping variable-frequency speed regulation method - Google Patents
Internal freewheeling type constant energy chopping variable-frequency speed regulation method Download PDFInfo
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Abstract
The invention relates to an internal freewheeling type constant energy chopping variable-frequency speed regulation method. The circuit is composed of a DC power supply, a constant energy chopping bridge, an internal freewheeling type inversion bridge, a control circuit and a freewheeling diode, wherein the positive pole of the DC power supply is connected with the input end of the constant energy chopping bridge, and the negative pole is connected with the anode of the freewheeling diode and the lower input end of the internal freewheeling type inversion bridge; the output end of the constant energy chopping bridge is connected with the cathode of the freewheeling diode and the upper input end of the internal freewheeling type inversion bridge; the output end of the control circuit is respectively connected with the constant energy chopping bridge and the trigger electrodes of main silicon controlled rectifiers in the internal freewheeling type inversion bridge; and the output end of the internal freewheeling type inversion bridge is connected with the input end of a load. All the silicon controlled rectifiers of the circuit operate in the natural zero switching state, and the theoretical switching loss is zero and is free from the restriction of switching frequency; and when the inversion bridge arm is straight-through due to short circuit or other reasons, the short-circuit power is still equal to the control value determined at the corresponding time point, so that a common burn-out mode is allowed to be used for protection without burning out the power switch.
Description
Technical field
The present invention relates to a kind of power converter method, relate in particular to a kind of general converter method with low-loss, highly reliable characteristic.
Background technology
Existing electronic power conversion method exists two restriction problems, the one, switching loss problem aspect PWM (pulse width modulation) technical development.Because the switch state of device for power switching, namely from be saturated to the cut-off or by the end of saturated, must just can finish through the constant current state of centre, and when under constant current state, working, it is all non-vanishing to flow through the electric current of switching device and terminal voltage that switching device bears, therefore, the product of this electric current and voltage just becomes the loss that switching device must bear---switching loss in this transfer process.Theory analysis and waveform are observed and are shown, although the life period of single switch loss waveform is very short, usually only have several microseconds, but maximum instantaneous power is often very large, may surpass the several times of switching device nominal maximum diffipation power to decades of times, like this, when the hard copped wave unsteady flow of traditional PWM mode was worked under high-frequency copped wave, high voltage, large electric current, high-power condition, the switching loss problem became the major obstacle of restriction technical development.Prior art mainly is to introduce soft switch circuit in traditional hard copped wave unsteady flow main circuit to the switching loss solution of problem.But a large amount of practices shows the introducing of soft switch circuit the many factors restriction is arranged, what wherein have the greatest impact is increase along with system's unsteady flow power, flow into and flow out the also thereupon increase of instantaneous power of soft switch circuit, because the inertia energy storage component parameters in the soft switch circuit can not change, like this, the terminal voltage of inertia energy storage element also will change thereupon, thereby the terminal voltage that switch element is born also changes along with the size of unsteady flow power, if this voltage surpass that device for power switching can bear ceiling voltage, then this device can breakdown damage.Hence one can see that, and there are the deficiencies such as accommodation is little, main circuit structure is complicated, reliability is low in existing soft switch technique, and Here it is so far still take the hard switching technology as main reason.
The 2nd, the fragile problem of device for power switching.Prior art mainly adopts instantaneous over-current protection to solve, and namely goes wrong and when causing inverter bridge leg to lead directly to the driving signal of fast shut-off power main switching device when system's generation output short-circuit or control circuit.This method can be protected the safety of power main switching device to a certain extent; but a large amount of practical experiences also show; still have the circuit of considerable part when the system power main switching device turn-offs fast, to be burnt; reason is because the existence of distributed inductance in the circuit; when device for power switching turn-offs fast; the high peak voltage that forms owing to the quick variation of the electric current that passes through on the distributed inductance; this peak voltage is with after the power supply forward is connected; act on device for power switching and cause the direct breakdown damage of device for power switching; therefore, adopt the method for instantaneous over-current can not fundamentally solve the damage problem of device for power switching when system's appearance is wrong.
Summary of the invention
The switching loss and the flimsy deficiency of device for power switching that exist for overcoming prior art the invention provides and a kind ofly allow again output to adopt commonsense method to protect and can not burn out highly reliable, low-loss unsteady flow new method of device without switching loss.The method can realize that all primary power switch devices turn on and off under natural zero switching state; and soft switch effect is not subjected to the impact of switching frequency and unsteady flow watt level; the control section that can also be implemented in converter system breaks down and causes inverter bridge leg straight-through or when causing the output short circuit owing to the reason of external circuit; the electrical power that flows into short dot still equals the controlling value determined; therefore, adopt common fusing mode to protect and can not burn device for power switching.
Interior continuous-flow type constant energy chopping frequency control circuit is comprised of DC power supply, permanent energy copped wave bridge, interior afterflow formula inverter bridge, control circuit, fly-wheel diode; The positive pole of DC power supply links to each other with the input of permanent energy copped wave bridge, the negative pole of DC power supply links to each other with the anode of the fly-wheel diode utmost point and the lower input of interior afterflow formula inverter bridge, and the output of permanent energy copped wave bridge links to each other with the upper input of the negative electrode of the fly-wheel diode utmost point and interior afterflow formula inverter bridge; The output of control circuit links to each other with the trigger electrode of each silicon controlled main rectifier in permanent energy copped wave bridge and the interior afterflow formula inverter bridge respectively; The output of interior afterflow formula inverter bridge links to each other with the input of three-phase alternating-current motor load.
The permanent energy copped wave of interior afterflow formula of the present invention frequency Varying and speed changing method is characterized in that having two core technologies:
The one, different from traditional electrical die mould or current mode unsteady flow pattern, the unsteady flow transmission characteristic of this system is the power-type characteristic.The advantage of power-type unsteady flow pattern is can solve easily without insoluble problems of traditional unsteady flow pattern such as switching loss operation and permission output long period short circuits, adopt the chopping way of permanent energy pulse to finish on the execution mode, namely utilize the transmission of doing in order to the whole energy of discrete way completion system that discharges and recharges of storage capacitor.Like this, as long as control accordingly the frequency that discharges and recharges of storage capacitor by the energy size of output waveform, after interior afterflow formula inverter bridge and output flat wave capacitor effect, can obtain required random waveform at output, and the short-circuit power during output short-circuit is not subjected to the impact of short-circuit impedance.
The 2nd, at the inverter bridge brachium pontis energy storage inductor is set, utilize its interior afterflow effect that the silicon controlled main rectifier of permanent energy copped wave bridge and interior afterflow formula inverter bridge is turned on and off simultaneously, make it the significantly copped wave upper limiting frequency of elevator system.
The control method of this system is divided into two parts:
The one, the silicon controlled control mode of permanent energy copped wave bridge is adopted the form of two divided-frequency, it is the in twos in turn conducting of diagonal angle of four one-way SCRs in the copped wave bridge, purpose is the unipolarity output pulses that the power supply energy of required transmission is decomposed into one by one independently, contains fixed energies in the mode of time division and periodically cross null character, and this pulse is transported to the upper input of interior afterflow formula inverter bridge.
The 2nd, the control mode of six silicon controlled main rectifiers of internal afterflow formula inverter bridge is: according to the instantaneous phase of three-phase output waveform, partly for ratio the inversion pulse is distributed by calculating rear round numbers, the rule of distributing is inversion output waveform to be divided equally again to be k interval (k 〉=1) first in the scope of 60 degree electrical degrees, then distribute n fixing pulse in each is interval, the zero-time t according to the interval tries to achieve interval interior pulse distribution formula: sinA again
t/ sinB
t, sinB
t/ sinC
t, sinC
t/ sinA
t, then system chooses in turn a paired pulses corresponding in three formula according to operating state and implements control.
The invention has the beneficial effects as follows: the controllable silicon of whole system all moves under natural zero switching state; the switching loss of system is zero in theory and is not subjected to the restriction of switching frequency; make mistakes at control circuit, when the reason such as output short-circuit causes the inverter bridge bridge arm direct pass; short-circuit power still equals the corresponding controlling value of constantly determining; thereby permission is adopted common fusing mode to protect and can not burnt device for power switching, and the indexs such as Security of the system, reliability and efficient all greatly improve.
Description of drawings
Fig. 1 is system architecture diagram;
Fig. 2 is the schematic diagram of permanent energy copped wave bridge;
Fig. 3 is the schematic diagram of interior afterflow formula inverter bridge;
Fig. 4 is voltage waveform and the interior afterflow inverter bridge dc bus current i of the output of permanent energy copped wave bridge
LOscillogram;
Fig. 5 is A, B, C three-phase alternating voltage oscillogram;
Fig. 6 is the trigger electrode driving pulse figure of silicon controlled main rectifier in permanent energy copped wave bridge and the interior afterflow inverter bridge.
Among the figure, 1 is permanent energy copped wave bridge, and 2 is interior afterflow formula inverter bridge, and 3 is control circuit, 4 is the threephase motor load, and D is the input of permanent energy copped wave bridge, and P is permanent energy copped wave bridge output, F is the lower input of interior afterflow formula inverter bridge, and G is the upper input of interior afterflow formula inverter bridge, i
LFor flowing into the electric current of dc bus, dotted line frame A1 is A phase inversion half-bridge full figure, dotted line frame Na1 is that A goes up freewheeling circuit in the brachium pontis mutually among the figure, Na2 is that A descends freewheeling circuit in the brachium pontis mutually, dotted line frame B1, Nb1, Nb2, internal structure and the operation principle of dotted line frame C1, Nc1, Nc2 are mutually identical with A, so do not repeat to draw, A, B, C are the input port of threephase motor load.
Embodiment
Below in conjunction with accompanying drawing, by embodiment the present invention is described in further details, but protection scope of the present invention is not limited to the following examples.
Shown in Fig. 1,2 and 3, the permanent energy copped wave of interior afterflow formula of the present invention frequency conversion speed-adjusting system is comprised of DC power supply E, permanent energy copped wave bridge 1, interior afterflow formula inverter bridge 2, control circuit 3, fly-wheel diode VD1, threephase motor load 4.The positive pole of DC power supply E links to each other with the input D of permanent energy copped wave bridge 1, and the negative pole of DC power supply E links to each other with the anode of fly-wheel diode utmost point VD1 and the lower input (F) of interior afterflow formula inverter bridge 2.The output P of permanent energy copped wave bridge 1 links to each other with the negative electrode of fly-wheel diode utmost point VD1 and the upper input G of interior afterflow formula inverter bridge 2.The output of control circuit 3 links to each other with the trigger electrode of each silicon controlled main rectifier in permanent energy copped wave bridge 1 and the interior afterflow formula inverter bridge 2 respectively, and the output of interior afterflow formula inverter bridge 2 links to each other with input A, B, the C of three-phase alternating-current motor load 4.
As shown in Figure 2, the essence of permanent energy copped wave bridge 1 is that output pulses forms circuit, jointly consisted of by four silicon controlled main rectifier V1, V2, V3, V4 and storage capacitor C6, its method of attachment is: the anodic bonding of silicon controlled main rectifier V1, V3 together, consist of the input D of permanent energy copped wave bridge, and link to each other with the positive pole of DC power supply E, the negative electrode of silicon controlled main rectifier V2, V4 links together, consist of the output P of permanent energy copped wave bridge, and link to each other with the upper input G of interior afterflow formula inverter bridge 2 among Fig. 3; The negative electrode of silicon controlled main rectifier V1 is connected anode and is connected with the end of storage capacitor C6 with silicon controlled main rectifier V2, the negative electrode of silicon controlled main rectifier V3 is connected anode and is connected with the other end of storage capacitor C6 with silicon controlled main rectifier V4; The gate pole of four silicon controlled main rectifier V1, V2, V3, V4 links to each other with the output of control circuit 3, under the control impuls effect that control circuit 3 produces, silicon controlled main rectifier in the copped wave bridge on two diagonal is in turn conducting in twos, thereby the power supply energy of required transmission is divided into one by one independently, contains the unipolarity output pulses of fixed energies and periodicity mistake null character in the mode of time division, and this pulse is transported to the upper input G of interior afterflow formula inverter bridge 2.
Figure 3 shows that the whole circuit of interior afterflow formula inverter bridge 2, Na1, Na2, Nb1, Nb2, Nc1, Nc2 are the interior freewheeling circuit on six brachium pontis among the figure, and its internal circuit structure is identical, describe take Na1 as the structure of the internal freewheeling circuit of example.Whole interior freewheeling circuit is comprised of afterflow reactor T1, anti-phase current-limiting resistance R1, anti-phase rectifier diode VD2, homophase current-limiting resistance R2, homophase rectifier diode VD3, filter capacitor C5, upper divider resistance R3, lower divider resistance R4 and afterflow controllable silicon V5, and its method of attachment is: the upper end of the centre tap of afterflow reactor T1 winding L 12, L13, the upper end of filter capacitor C5, lower divider resistance R4, the negative electrode of afterflow controllable silicon V5 link to each other; Between the trigger electrode of anti-phase current-limiting resistance R1 and the upper end that is connected to winding L 12 after anti-phase rectifier diode VD2 connects and afterflow controllable silicon V5; Between the lower end of homophase current-limiting resistance R2 and the lower end that is connected to winding L 13 after homophase rectifier diode VD3 connects and filter capacitor C5; The lower end of filter capacitor C5 links to each other with the left end of upper divider resistance R3, the negative electrode of homophase rectifier diode VD3 again; The right-hand member of upper divider resistance R3 links to each other with the lower end of lower divider resistance R4, the trigger electrode of afterflow controllable silicon V5; The lower end of winding L 11 is the interface J3 of interior freewheeling circuit Na1 among the afterflow reactor T1, the anode of afterflow controllable silicon V5 is the interface J4 of interior freewheeling circuit Na1, the upper end of winding L 11 is the interface J1 of interior freewheeling circuit Na1 among the afterflow reactor T1, and the negative electrode of afterflow controllable silicon V5 is the interface J2 of interior freewheeling circuit Na1.
As shown in Figure 3, the whole circuit of interior afterflow formula inverter bridge 2 is comprised of three identical inversion half-bridge A1, B1, C1 and flat wave capacitor C2, C3, C4 of structure, wherein, inversion half-bridge A1 is comprised of the silicon controlled main rectifier Va1 of upper and lower brachium pontis and Va2, corresponding interior freewheeling circuit Na1 and Na2 and flat wave capacitor C2.Take the A circuitry phase as example, its method of attachment is: the anode of the upper brachium pontis silicon controlled main rectifier Va1 of inversion half-bridge A1 links to each other with the upper input G of interior afterflow formula inverter bridge 2, and the negative electrode of the upper brachium pontis silicon controlled main rectifier Va1 of inversion half-bridge A1 links to each other with interface J1, the J2 of interior freewheeling circuit Na1; The interface J3 of interior freewheeling circuit Na1 links to each other with the left end of the interface J1 of interior freewheeling circuit Na2, flat wave capacitor C2, the input A of three-phase alternating-current motor load 4; The interface J4 of interior freewheeling circuit Na1 links to each other with the interface J2 of the interface J4 of the interface J2 of the interface J4 of the end of the interface J2 of interior freewheeling circuit Na2, flat wave capacitor C2, C3, C4, interior freewheeling circuit Nb1, interior freewheeling circuit Nb2, interior freewheeling circuit Nc1, interior freewheeling circuit (Nc2); The anode of the lower brachium pontis silicon controlled main rectifier Va2 of inversion half-bridge A1 links to each other with interface J3, the J4 of interior freewheeling circuit Na2, and 2 times input F of the negative electrode of the lower brachium pontis silicon controlled main rectifier Va2 of inversion half-bridge A1 and interior afterflow inverter bridge link to each other.
Below elaborate the course of work of the permanent energy copped wave of interior afterflow formula of the present invention frequency conversion speed-adjusting system and the work wave of reference point.
One, permanent energy copped wave bridge
The voltage u that permanent energy copped wave bridge 1 output P is ordered
PAnd dc bus current i
LWaveform as shown in Figure 4.
(a) t
0Constantly
Circuit enters stable state, and storage capacitor C6 both end voltage is E, u
C6Polarity is lower just upper negative, flows through the current i of dc bus
LBe zero.
(b) t
0～t
1During this time
t
0Constantly, trigger simultaneously two silicon controlled main rectifiers on the corresponding brachium pontis in silicon controlled main rectifier V1, the V4 of permanent energy copped wave bridge and the interior afterflow inverter bridge 2, for example Va1 and Vb2, make it conducting, electric current is then arranged through A, B two-phase, interior freewheeling circuit Nb2, silicon controlled main rectifier Vb2, the circulation of DC power supply E negative pole of DC power supply E positive pole, silicon controlled main rectifier V1, storage capacitor C6, silicon controlled main rectifier V4, Va1, interior freewheeling circuit Na1, threephase motor load 4, t
0The current potential of permanent energy copped wave bridge output P is 2E constantly, dc bus current i
LWith the rising of starting from scratch of sinusoidal rule, can find out that the turn-on consumption of silicon controlled main rectifier V1, V4, Va1, Vb2 is zero (such as Fig. 4).Then, storage capacitor C6 begins to release energy, its voltage u
C6Polarity still is lower just upper negative, two afterflow reactor winding L, the 11 beginning energy storage in interior freewheeling circuit Na1, the Nb1.
Considered between the threephase load large flat wave capacitor C2, C3, the C4 of same capability in parallel, so load terminal voltage u
0Within the pulse period, be made as constant, and in ignoring circuit after the pressure drop of controllable silicon and wire, according to the circuit correlation computations,
u
P=u
o+ (2E-u
o) coswt (formula 1-1)
To t
1Capacitance voltage drops to zero constantly, P point voltage u
P=E, dc bus current i
LStill continue to rise.
(c) t
1～t
2During this time
From t
1Beginning, storage capacitor C6 reverse charge, i.e. u
C1Polarity transfers to just lower negative, but the voltage u of two afterflow reactor winding L 11
LPolarity still is upper just lower negative, illustrates that afterflow reactor winding L 11 continues energy storage.t
2Constantly, P point voltage u
PEqual load both end voltage u
o, dc bus current i
LArrive maximum, according to formula (1-1), during to the wt=pi/2, the voltage that P is ordered will be u
0
At t
0～t
2Two afterflow reactor winding L 11 voltage u during this time
LPolarity be upper just lower negative, according to the definition of Same Name of Ends as can be known the afterflow controllable silicon V5 trigger electrode in interior freewheeling circuit Na1, Nb2 have certain trigger voltage, so but since afterflow controllable silicon V5 do not add forward voltage can conducting.
(d) t
2～t
3During this time
t
2After, because the distributed inductance of permanent energy copped wave bridge 1 circuit and the existence of circuit distributed inductance, its stored energy discharges by fly-wheel diode VD1, bus current i
LBegin to descend voltage u by sinusoidal rule
PAlso continue to descend by sinusoidal rule.During this period, two afterflow reactor winding L, 11 beginning exoergics in interior freewheeling circuit Na1, the Nb2 and the polarity of its induced voltage becomes lower just upper negative, according to the definition of Same Name of Ends as can be known, the afterflow controllable silicon V5 that is engraved at this moment in interior freewheeling circuit Na1, the Nb2 has applied certain trigger voltage, and the silicon controlled trigger voltage is substantially constant in short-term, but can conducting owing to inadequate its turning-on voltage of forward anode and cathode voltage on the controllable silicon.t
3Constantly, permanent energy copped wave bridge 1 circuit distributed inductance and circuit distributed inductance energy discharge complete by fly-wheel diode VD1, dc bus current i
LEqual zero, the reverse charge voltage of storage capacitor C6 is to E, and its polarity is upper just lower negative, and the P point voltage reduces to zero, silicon controlled main rectifier V1, the V4 of permanent energy copped wave bridge 1 circuit and controllable silicon Va1, the Vb2 in the interior afterflow formula inverter bridge 2 turn-off under zero current, so its turn-off power loss also is zero.
(e) t
3～t
4During this time
Dc bus current i
LEqual zero, the trigger electrode voltage of interior freewheeling circuit afterflow controllable silicon V5 triggers on upper basis of once triggering again, afterflow controllable silicon V5 conducting, and the energy that two afterflow reactor winding L 11 are stored up is transferred to its energy on flat wave capacitor C2, C3, the C4 by the V5 afterflow of afterflow controllable silicon.t
4Constantly, add trigger impulse on silicon controlled main rectifier V2, V3, Va1, the Vc2 and make its simultaneously conducting, next work period, repeat t
0～t
4At this moment process has again 2 times to the voltage of DC power supply E on the output P of permanent energy copped wave bridge 1.After being discharged, storage capacitor C6 just begins again reverse charge, but this moment, institute's charging voltage was lower just upper negative, after the upper voltage of storage capacitor C6 equaled supply voltage, silicon controlled main rectifier V2, V3, Va1, Vc2 were zero naturally shutoff because of the electric current that passes through, simultaneously P point voltage vanishing.And so forth, make and constantly obtain discrete permanent energy pulse on the P point, this energy is given load after offering the interior afterflow formula inverter bridge 2 of back.
Can find out from the analysis of the above-mentioned course of work, be stored in that afterflow reactor winding L 11 energy are to transfer on the flat wave capacitor by the afterflow passage of inside in the interior afterflow inverter bridge 2, the effect of afterflow reactor winding L 11 has four like this: 1. be the resonant element of the soft switching function circuit of system resonance; 2. to the dc bus current i of system
LPlay the flat ripple effect of energy storage; 3. six silicon controlled main rectifiers of afterflow inverter bridge 2 can turn on and off simultaneously with four silicon controlled main rectifiers of permanent energy copped wave bridge 1 in guaranteeing; thereby system can stably be worked under quite high inversion modulating frequency; 4. when the output short circuit; shift the energy of coming with the buffering method storage from storage capacitor C6; like this; can effectively limit on the one hand the instantaneous peak current of the silicon controlled main rectifier that flows through interior afterflow inverter bridge 2, create condition for the highly reliable protection of adopting common slow fuse device to carry out device on the other hand.
Two, interior afterflow formula inverter bridge
(a) the pulse distribution rule of three-phase inversion process
As shown in Figure 5, at first the three-phase alternating current waveform with output is equally divided into six minizones with 60 degree electrical degrees, and then divides this 6 minizones equally, just has so a, b, c, d, six time control points of e, f within 0～1 time period.0～6 is one-period in the three-phase waveform, we regard the B phase waveform in 0～1 time period as negative maximum consistent, it is consistent that A phase waveform in 1～2 time period is regarded as positive maximum, C phase waveform in 2～3 time periods is regarded as negative maximum consistent, positive maximum consistent the B phase waveform section of regarding as in 3～4 time periods, it is consistent that A phase waveform in 4～5 time periods is regarded as negative maximum, and it is consistent that the C phase waveform in 5～6 times is regarded as positive maximum.Present embodiment is analyzed with the waveform in 0～1 time period, and the analysis classes of waveform is like 0～1 time period in all the other time periods.Because the copped wave bridge is discrete permanent energy chopping way, so each impulse action resulting energy when main circuit is identical.For making better inversion be output as sine wave, in each minizone, trigger controllable silicon with six pulses.Within 0～1 time period, the angle of A phase waveform is to 60 degree from 0 degree, the angle of C phase waveform is to 180 degree from 120 degree, the angle of B phase waveform is to 300 degree from 240 degree, because it is negative maximum consistent that we regard the B phase waveform in 0～1 time period as, that is to say B in every interval all to six pulses, therefore only consider A phase and C magnitude relationship mutually, i.e. A phase and C pulse distribution relation mutually.The A phase waveform is 0 degree in the angle in 0 moment, and then it is respectively 10 degree in a, b, c, d, e, the angle in six moment of f, 20 degree, and 30 degree, 40 spend, 50 degree and 60 degree.The C phase waveform is 120 degree in the angle in 0 moment, and then it is respectively 130 degree in a, b, c, d, e, the angle in six moment of f, 140 degree, and 150 degree, 160 spend, 170 degree and 180 degree.Then at a moment sinA=sin10=0.174, sinC=sin130=0.766, sinA: sinC ≈ 1: 5 just should give six trigger impulses of controllable silicon Vb2 in 0～a interval so, give five trigger impulses of controllable silicon Vc1, and give trigger impulse of controllable silicon Va1.At b moment sinA=sin20=0.342, sinC=sin140=0.643, sinA: sinC ≈ 2: 4 just should give six trigger impulses of controllable silicon Vb2 in a～b interval so, gives four trigger impulses of controllable silicon Vc1, and gives two trigger impulses of controllable silicon Va1.
Concrete a, b, c, d, e, f related data constantly see the following form:
| Constantly | a | b | c | d | e | f |
| sinA | 0.174 | 0.342 | 0.5 | 0.643 | 0.766 | 0.866 |
| sinC | 0.766 | 0.643 | 0.5 | 0.342 | 0.174 | 0 |
| sinA∶ |
1∶5 | 2∶4 | 3∶3 | 4∶2 | 5∶1 | 6∶0 |
| Vb2 SCR |
6 | 6 | 6 | 6 | 6 | 6 |
| Vc1 SCR |
5 | 4 | 3 | 2 | 1 | 0 |
| Va1 SCR |
1 | 2 | 3 | 4 | 5 | 6 |
By that analogy, just can obtain the pulse control mode in the whole three-phase waveform one-period, after this same rule repeats to get final product.
(b) afterflow formula inversion process analysis procedure analysis in the three-phase
In difference constantly, when controlling in permanent energy copped wave bridge 1 circuit silicon controlled main rectifier V1, V4 or silicon controlled main rectifier V2, V3 conducting, also need control the silicon controlled main rectifier conducting in the upper and lower brachium pontis in the interior afterflow formula inverter bridge 2, the voltage inversion that makes DC power supply E is the alternating voltage of threephase motor load 4 needed a certain frequencies.
Detailed process as shown in Figure 6, suppose that 0 moment circuit is in stable state, give permanent energy copped wave bridge 1 circuit controllable silicon V1 this moment, when V4 adds trigger impulse, give silicon controlled main rectifier Va1, Vb2 adds trigger impulse makes its conducting, such DC power supply E anode, silicon controlled main rectifier V1, storage capacitor C6, silicon controlled main rectifier V4, silicon controlled main rectifier Va1, the winding L 11 of afterflow reactor T1 among the interior freewheeling circuit Na1, threephase motor load 4, the winding L 11 of afterflow reactor T1 among the interior freewheeling circuit Nb2, silicon controlled main rectifier Vb2 and DC power supply E negative terminal just form the loop, make the permanent energy pulse of copped wave through interior afterflow formula inverter bridge 2 circuit supply loads.Then at silicon controlled main rectifier V1, after the automatic cut-off of V4 controllable silicon, give silicon controlled main rectifier V2, when V3 adds trigger impulse, give silicon controlled main rectifier Vc1, Vb2 adds trigger impulse makes its conducting, such DC power supply E anode, silicon controlled main rectifier V3, storage capacitor C6, silicon controlled main rectifier V2, silicon controlled main rectifier Vc1, the winding L 11 of afterflow reactor T1 among the interior freewheeling circuit Nc1, threephase motor load 4, the winding L 11 of afterflow reactor T1 among the interior freewheeling circuit Nb2, silicon controlled main rectifier Vb2, just form the loop with DC power supply E negative terminal, make permanent energy after the permanent energy copped wave through interior afterflow formula inverter bridge 2 circuit supply loads.Then after silicon controlled main rectifier V2, V3 automatic cut-off, reach master control silicon Vc1, Vb2 but again trigger silicon controlled main rectifier V1, V4, again the permanent energy pulse supply load after the copped wave.So make silicon controlled main rectifier V1, V4 and V2 in the permanent energy copped wave bridge 1, V3 sequential turn-on, and make silicon controlled main rectifier Vc1, Vb2 conducting five times in the interior afterflow formula inverter bridge 2, simultaneously because the effect of flat wave capacitor C2, C3, C4, the three-phase waveform that inversion is gone out is the 0～a section among Fig. 5, then continue to make silicon controlled main rectifier V1, V4 and silicon controlled main rectifier V2 in the permanent energy copped wave bridge 1, V3 sequential turn-on six times, but the pulse distribution of interior afterflow formula inverter bridge 2 becomes silicon controlled main rectifier Va1, Vb2 conducting secondary, silicon controlled main rectifier Vc1, Vb2 conducting four times; Again in six pulse periods of back, make pulse distribution change into silicon controlled main rectifier Va1, Vb2 conducting three times, silicon controlled main rectifier Vc1, Vb2 conducting three times subsequently; Then be silicon controlled main rectifier Va1, Vb2 conducting four times, silicon controlled main rectifier Vc1, Vb2 conducting secondary; Silicon controlled main rectifier Va1, Vb2 conducting five times, silicon controlled main rectifier Vc1, Vb2 conducting are once; Silicon controlled main rectifier Va1, Vb2 conducting six times.Above-mentioned whole process can make inversion go out 0～f section in the three-phase alternating current waveform shown in Figure 5, finishes the inversion in the sixth cycle in the three-phase alternating current waveform.The control sequence in all the other 5/6ths cycles is analogized with said process and is got final product, so no longer repeat to discuss.
Claims (2)
1. the permanent energy copped wave of afterflow formula frequency Varying and speed changing method in a kind, it is characterized in that by DC power supply E, permanent energy copped wave bridge (1), interior afterflow formula inverter bridge (2), control circuit (3), fly-wheel diode VD1 forms, wherein, the positive pole of DC power supply E links to each other with the input of permanent energy copped wave bridge (1), the negative pole of DC power supply E links to each other with the anode of fly-wheel diode utmost point VD1 and the lower input of interior afterflow formula inverter bridge (2), the output of permanent energy copped wave bridge (1) links to each other with the negative electrode of fly-wheel diode utmost point VD1 and the upper input of interior afterflow formula inverter bridge (2), the output of control circuit (3) links to each other with the trigger electrode of each silicon controlled main rectifier in permanent energy copped wave bridge (1) and the interior afterflow formula inverter bridge (2) respectively, and the output of interior afterflow formula inverter bridge (2) links to each other with the input of load;
Described permanent energy copped wave bridge (1) is that output pulses forms circuit, consisted of by four silicon controlled main rectifier V1, V2, V3, V4 and storage capacitor C6, under the control impuls effect that control circuit (3) produces, in twos in turn conducting of silicon controlled main rectifier in the permanent energy copped wave bridge (1) on two diagonal, the power supply energy of required transmission is divided into one by one independently, contains the unipolarity output pulses of fixed energies and periodicity mistake null character in the mode of time division, and this pulse is transported to the upper input of interior afterflow formula inverter bridge (2);
The whole circuit of described interior afterflow formula inverter bridge (2) is comprised of three identical inversion half-bridge A1, B1, C1 and flat wave capacitor C2, C3, C4 of structure, wherein, inversion half-bridge A1 is comprised of the silicon controlled main rectifier Va1 of upper and lower brachium pontis and Va2, corresponding interior freewheeling circuit Na1 and Na2 and flat wave capacitor C2, method of attachment is: the anode of the upper brachium pontis silicon controlled main rectifier Va1 of inversion half-bridge A1 links to each other with the upper input G of interior afterflow formula inverter bridge (2), and the negative electrode of the upper brachium pontis silicon controlled main rectifier Va1 of inversion half-bridge A1 links to each other with interface J1, the J2 of interior freewheeling circuit Na1; The interface J3 of interior freewheeling circuit Na1 links to each other with the left end of the interface J1 of interior freewheeling circuit Na2, flat wave capacitor C2, the input A of three-phase alternating-current motor load (4); The interface J4 of interior freewheeling circuit Na1 links to each other with the interface J4 of the interface J2 of the interface J4 of the end of the interface J2 of interior freewheeling circuit Na2, flat wave capacitor C2, C3, C4, interior freewheeling circuit Nb1, interior freewheeling circuit Nb2, interior freewheeling circuit Nc1, the interface J2 of interior freewheeling circuit Nc2; The anode of the lower brachium pontis silicon controlled main rectifier Va2 of inversion half-bridge A1 links to each other with interface J3, the J4 of interior freewheeling circuit Na2, and the negative electrode of the lower brachium pontis silicon controlled main rectifier Va2 of inversion half-bridge A1 links to each other with the lower input F of interior afterflow inverter bridge (2); The structure of inversion half-bridge B1, C1 is identical with inversion half-bridge A1; Internally the control mode of six silicon controlled main rectifiers of afterflow formula inverter bridge (2) is the instantaneous phase according to the three-phase output waveform, partly for ratio the inversion pulse is distributed by calculating rear round numbers, the rule of distributing is inversion output waveform to be divided equally again to be k interval (k 〉=1) first in the scope of 60 degree electrical degrees, then in each is interval, distribute n the pulse of fixing, again according to the phase place A of the three phase sine voltage of this interval zero-time t
t, B
t, C
tSolve the instantaneous amplitude sinA of this moment t voltage
t, sinB
t, sinC
tAfter, try to achieve three pulse partition: sinA in this interval
t/ sinB
t, sinB
t/ sinC
t, sinC
t/ sinA
t, then system chooses in turn a paired pulses corresponding in three formula according to operating state and implements control.
2. the permanent energy copped wave of interior afterflow formula according to claim 1 frequency Varying and speed changing method, it is characterized in that Na1, Na2, Nb1, Nb2, Nc1, Nc2 are the interior freewheeling circuit on six brachium pontis, freewheeling circuit is comprised of afterflow reactor T1, anti-phase current-limiting resistance R1, anti-phase rectifier diode VD2, homophase current-limiting resistance R2, homophase rectifier diode VD3, filter capacitor C5, upper divider resistance R3, lower divider resistance R4 and afterflow controllable silicon V5 in each.
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| CN2241417Y (en) * | 1995-09-27 | 1996-11-27 | 刘建平 | AC frequency converter using dc to ac conversion |
| CN1317864A (en) * | 2001-05-16 | 2001-10-17 | 屈维谦 | Current-type chopper with self-excited thyristor |
| CN2511045Y (en) * | 2001-11-18 | 2002-09-11 | 北京金迪华通电气新技术有限公司 | Current type bridge cut-off chopper internal feedback motor speed regulation control device |
| CN1547317A (en) * | 2003-12-10 | 2004-11-17 | �Ϻ���ͨ��ѧ | Mother technique of discrete digit constant energy wave chopping and current transformation |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2241417Y (en) * | 1995-09-27 | 1996-11-27 | 刘建平 | AC frequency converter using dc to ac conversion |
| CN1317864A (en) * | 2001-05-16 | 2001-10-17 | 屈维谦 | Current-type chopper with self-excited thyristor |
| CN2511045Y (en) * | 2001-11-18 | 2002-09-11 | 北京金迪华通电气新技术有限公司 | Current type bridge cut-off chopper internal feedback motor speed regulation control device |
| CN1547317A (en) * | 2003-12-10 | 2004-11-17 | �Ϻ���ͨ��ѧ | Mother technique of discrete digit constant energy wave chopping and current transformation |
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