CN201690395U - Soft starter for continuous frequency conversion and voltage transformation of motor - Google Patents
Soft starter for continuous frequency conversion and voltage transformation of motor Download PDFInfo
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- CN201690395U CN201690395U CN2010201582187U CN201020158218U CN201690395U CN 201690395 U CN201690395 U CN 201690395U CN 2010201582187 U CN2010201582187 U CN 2010201582187U CN 201020158218 U CN201020158218 U CN 201020158218U CN 201690395 U CN201690395 U CN 201690395U
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- switch
- mechanical switch
- inverter
- soft initiator
- rectifier bridge
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Abstract
The utility model relates to an electric and electronic control device, especially to a soft starter for continuous frequency conversion and voltage transformation of a motor. The soft starter includes a mechanical switch K1 connected with a three-phase network power supply and a series circuit consisting of an inverter and an all-controlled high frequency electronic switch Kd; the series circuit and a capacitor C0 are in parallel connection on two output ends of a three-phase diode rectifier bridge; the mechanical switch K1 is connected on an input end of the three-phase diode rectifier bridge; the inverter has three pairs of bridge arms composed of six groups of thyristors Th1,1'-Th6,6'; each bridge arm is respectively composed of two thyristors which are in reverse parallel connection; conductors are respectively led out from the middle points of upper and lower bridge arms of three pairs of bridge arms and the bridge arms are connected to a three-phase asynchronous motor via the mechanical switch K4. The utility model only uses an all-controlled electronic switch Kd to simultaneously regulate the voltage and switch off the inverter thyristor and switch off the main circuit when requiring protection and employs the thyristor inverter to make lines simple and reliable, and has advantages of low cost and great use flexibility.
Description
Technical field
The utility model relates to a kind of power electronics control device, and more particularly, the utility model relates to a kind of soft initiator that is used for the continuous frequency conversion and voltage transformation of motor.
Background technology
In service in present industrial production, because electric current is too big during big motor start-up, make electrical network be difficult to bear, so often need add a cover soft initiator.In fact soft initiator commonly used is exactly the reducing transformer that a cover is made up of thyristor.Along with the reduction of voltage, though starting current can reduce, detent torque also reduces greatly, starts being difficult to than heavy duty.Preferably in step-down, can reduce frequency, because reduce frequency the magnetic field of motor is strengthened, thereby improve torque.And from reducing electrical network is impacted and both demand angles considerations of raising motor stability, this variable-frequency variable-voltage requires to regulate (or being bordering on continuous adjusting) continuously.Though utilize the different connections of thyristor can produce the different frequency of some levels, because progression very little, Chang Buneng satisfies the requirement of soft start.Therefore have to adopt expensive frequency converter to replace starter sometimes.
The utility model content
The technical problems to be solved in the utility model is to overcome deficiency of the prior art, and a kind of soft initiator that is used for the continuous frequency conversion and voltage transformation of motor is provided.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of soft initiator that is used for the continuous frequency conversion and voltage transformation of motor is provided, comprises the mechanical switch K1 that links to each other with the three phase network power supply; This soft initiator also comprises the series circuit of being made up of inverter and full-control type high frequency electronic switch Kd, this series circuit and capacitor C
0Be connected in parallel on three-phase diode rectifier bridge output two ends; Described mechanical switch K1 is connected in three-phase diode rectifier bridge input; Described inverter is by six groups of thyristor Th1,1 '～Th6,6 ' forms 3 pairs of brachium pontis, each brachium pontis by two anti-and thyristors form; The mid point of the upper and lower bridge arm of 3 pairs of brachium pontis is drawn lead respectively and is connected to threephase asynchronous machine through mechanical switch K4.
In the utility model, the connected mode of brachium pontis is in the described inverter: Th1 and Th1 ' instead also, Th4 and Th4 ' instead also, both form first pair of brachium pontis at the back of connecting; Th2 and Th2 ' instead also, Th5 and Th5 ' instead also, both form second pair of brachium pontis at the back of connecting; Th3 and Th3 ' instead also, Th6 and Th6 ' instead also, both form the 3rd pair of brachium pontis at the back of connecting.
In the utility model, also comprise inductance L
0Setting, be following in the form any one of being provided with:
A: inductance L
0There are three, are set up in parallel on three leads between mechanical switch K1 and the three-phase diode rectifier bridge input;
B: inductance L
0There is one, is arranged at the output and the capacitor C of three-phase diode rectifier bridge
0Between lead on.
In the utility model, described threephase asynchronous machine is connected to a mechanical switch K2, and mechanical switch K2 and described mechanical switch K1 are connected to the three phase network power supply by same group of lead, three inductance L
0Be set up in parallel with this group lead on.
In the utility model, described full-control type high frequency electronic switch Kd has following any one form of the composition:
A: the arbitrary end that is connected on rectifier bridge output by a high frequency electronic switch;
B: by the series connection of a plurality of chips and be encapsulated in and become a high-voltage switch gear in the module, be connected on arbitrary end of rectifier bridge output;
C: be connected into a high-voltage switch gear by a plurality of high frequency electronic switchs, be connected on arbitrary end of rectifier bridge output;
D: be made up of two groups of high voltagehigh frequency electronic switches, the two works in same frequency and same phase; Be series at the two ends of inverter as two Kd/2, promptly be connected to the two ends of three-phase diode rectifier bridge separately.
In the utility model, a LC filter is set between described mechanical switch K4 and the threephase asynchronous machine.
In the utility model, also comprise one group of bidirectional electronic switch ThD, ThE, ThF, be connected in series in respectively between the mid point and mechanical switch K4 of upper and lower bridge arm of 3 pairs of brachium pontis, bidirectional electronic switch ThD, ThE, ThF by two anti-and thyristors form.
In the utility model, described threephase asynchronous machine is connected to three phase mains by lead separately, and this lead is provided with a mechanical switch K3, and its two ends are parallel with one group of bidirectional electronic switch Th
A, Th
B, Th
C, bidirectional electronic switch Th
A, Th
B, Th
CBy two anti-and thyristor compositions; ThA, ThB, ThC and ThD, these two groups of switches of ThE, ThF are chain, and both do not allow conducting simultaneously, and the two forms electronic switch.
In the utility model, described soft initiator is installed on the casing inside of described threephase asynchronous machine, and this threephase asynchronous machine becomes the motor that the energy continuous frequency conversion and voltage transformation starts.
Compared with prior art, the beneficial effects of the utility model are:
The utility model proposes with the square-wave voltage startup of inverter and the innovative idea of under the electrical network sine voltage, moving, the basic scheme that realizes this innovative idea is the inverter bridge leg that adopts a full-control type electronic switch Kd and reverse parallel connection thyristor to form, and makes starter have superior performance.Cross the driving frequency that changes above-mentioned inverter and can realize frequency conversion, can realize transformation, continuously change driving frequency and duty ratio simultaneously and can realize continuous frequency conversion and voltage transformation by the duty ratio that changes above-mentioned Kd.
The utility model only use a full-control type electricity K switch d (or respectively connect half up and down, Kd/2,, promptly two switches are born a half voltage separately) just can play pressure regulation simultaneously, turn-off the inverter thyristor and when needing protection, cut off three effects such as main circuit.Because adopt thyristor inverter to make circuit simple and reliable, cost is lower simultaneously.
The utility model proposes complete commutation circuit, can carry out electronic type and switch between soft start power supply and three phase network power supply, have following function: 1, one cover soft initiator can timesharing starts two or multiple motors more; 2, two cover soft initiators can be supplied with a motor, and one is enclosed within usefulness, another set of standby; 3, the input of soft initiator, output have met mechanical switch K1, K4 respectively, can guarantee to start finish after starter be not with high potential, can not cause unexpected personal safety accident, also can add chain earthing device in addition in case of necessity; 4, can carry out the On line inspection maintenance; 5, when having fault, electronic switch can substitute with mechanical switch; Deng.But switch is used to such an extent that many can increase cost, can increase and decrease wherein some switches according to user's needs.Can only provide electronic type to switch with a mechanical switch and a cover electronic switch the most after a little while, perhaps only provide mechanical type to switch with two mechanical switch, the user has sizable flexibility in use.
Description of drawings
Fig. 1 is a continuous frequency conversion and voltage transformation soft initiator basic circuit diagram.
Embodiment
Below in conjunction with embodiment the utility model is described in further detail:
The soft initiator of the continuous frequency conversion and voltage transformation that is used for motor in the utility model as shown in Figure 1.This soft initiator comprises the mechanical switch K1 and the inductance L 0 of connecting with the three phase network power supply, it is characterized in that, this soft initiator also comprises by six groups of thyristor Th1,1 '～Th6, the series circuit that 6 ' inverter that constitutes and full-control type high frequency electronic switch Kd form, this series circuit and an electric capacity are connected in parallel on three-phase diode rectifier bridge output two ends; Described inductance L
0Be connected in three-phase diode rectifier bridge input; Described inverter is made up of 3 pairs of brachium pontis, and each brachium pontis is formed by two anti-thyristors also; The mid point of the upper and lower bridge arm of 3 pairs of brachium pontis is drawn lead respectively and is connected to threephase asynchronous machine through mechanical switch K4.Threephase asynchronous machine also can be connected to the three phase network power supply separately.
This inverter works in three-phase square wave voltage, and the connected mode of its brachium pontis is: Th1 and Th1 ' instead also, Th4 and Th4 ' instead also, both form first pair of brachium pontis at the back of connecting; Th2 and Th2 ' instead also, Th5 and Th5 ' instead also, both form second pair of brachium pontis at the back of connecting; Th3 and Th3 ' instead also, Th6 and Th6 ' instead also, both form the 3rd pair of brachium pontis at the back of connecting.
Full-control type high frequency electronic switch Kd can select the product of the SKM145GB176D model of SEMIKRON company production, full-control type high frequency electronic switch Kd is by a plurality of chip series connection when voltage is higher and is encapsulated in the module, perhaps is connected into a switch by a plurality of high frequency electronic switchs.Full-control type high frequency electronic switch Kd can be used as two switches, and each promptly is connected to the two ends that the three-phase diode rectifier bridge is exported separately for the two ends that Kd/2 is series at the inverter input; Also can lump together becomes a switch, is connected on arbitrary end of rectifier bridge output.
Full-control type high frequency electronic switch K
dPlayed three effects: 1, change high frequency electronic switch K
dDuty ratio can change voltage; 2, the thyristor that can turn-off inverter makes it the change of current; 3, cut off circuit rapidly when fault such as overcurrent, overvoltage, overheated, short circuit occurring when inverter and load, play a protective role.Full-control type high frequency electronic switch K
dCan be low pressure, also can be high pressure.
In the soft initiator, can also comprise one group of bidirectional electronic switch ThD, ThE, ThF, be connected in series in respectively between the mid point and mechanical switch K4 of upper and lower bridge arm of 3 pairs of brachium pontis, bidirectional electronic switch ThD, ThE, ThF by two anti-and thyristors form.
Simultaneously, when being connected on the circuit of three phase network power supply separately, described threephase asynchronous machine can be provided with a mechanical switch K3, its two ends are parallel with one group of bidirectional electronic switch ThA, ThB, ThC, and bidirectional electronic switch ThA, ThB, ThC be anti-and thyristor composition by two.Utilizing ThA, ThB, ThC and ThD, ThE, ThF can carry out electronic type between soft start power supply and three phase network power supply switches.
K1, K2, K3, K4 are mechanical switch, and ThA, ThB, ThC and ThD, ThE, ThF are bidirectional electronic switch.The relay action relationships of these switches is as follows:
1, shut down the not time spent for a long time, K1, K2, K3, K4 all disconnect, and all thyristors and Kd also all disconnect;
2, electronic type is switched: K1, K2, K4 close before the startup, conducting ThD, ThE, ThF, start by the variable-frequency variable-voltage mode, start the triggering that disconnects inverter, ThD, ThE, ThF and high frequency electronic switch Kd after finishing, conducting ThA, ThB, ThC when voltage zero-cross have so just finished the electronic type switching.This conversion is very fast, and closes a floodgate steadily.Then disconnect K1, K4, the K3 that closes again thereafter, this is an auxiliary movement.Also can save K3, and allow ThA, ThB, ThC work always, replace K3.Further also can save K2, also replace with ThA, ThB, ThC in the lump, but ThA, ThB, ThC should be connected on the back of K1 this moment, allow K1 not only cut off soft initiator but also cut off ThA, ThB, ThC.
After above-mentioned switching was finished, energy was from the electrical network inflow motor, and can not flow to electrical network from motor, the kinetic energy (mechanical energy) of motor and load can not be transformed into the power flow electrical network when motor deceleration, do not consider reverse switching problem above therefore.But the user who has has the requirement of reverse switching.Reverse switching is exactly that the motor that will be connected on originally on the electrical network switches on the inverter.
3, reverse switching: in the occasion of the reverse switching of needs, consider as follows:, therefore must adopt electronic switch to switch to inverter square wave power supply fast from the electrical network sine wave because motor can not be received the inverter power supply and the sinusoidal wave electrical network of square wave simultaneously.Take following first, second two stages in the utility model.
The first, the preparatory stage: motor ran on the electrical network sine voltage originally, and K1, K4 among Fig. 1 disconnect, and K2, K3 are conductings.Be connected in series bidirectional electronic switch ThD, ThE, ThF among the figure two on the K4, they all disconnect.At first K3 is disconnected before the switching, again K1, K4 are closed,, regulate the frequency and the voltage of inverter then, make it to be adapted to work in the generator state and suitable current is arranged after motor inserts inverter power supply.This adjusting is finished automatically by control system.
Switch step: disconnect ThA, ThB, ThC, follow rapid conducting ThD, ThE, ThF.This stage also finishes automatically.Leave certain dead band between disconnection and the conducting.We also can save ThD, ThE, ThF, and replace with Kd, make Kd earlier disconnected once, treat that ThA, ThB, ThC disconnect after, conducting Kd rapidly again.
The occasion that needs reverse switching also need adopt circuit that energy can two-way flow to replace the circuit of Fig. 1.
4, mechanical type switches: utilize K switch 1, K2, K3, K4 among Fig. 1, can finish change action equally, but action is slower, the speed of motor may have bigger variation before and after switching, and makes that to switch the rush of current of back when inserting bigger.Generally say and to be applicable to reverse switching.
If only need forward to switch, do not need reverse switching, then can save ThD, ThE, ThF among Fig. 1.If only need mechanical type to switch, then can also save ThA, ThB, ThC, K2, K3 also can make a cover into.
Be provided with quadruplet mechanical switch and two cover electronic switchs among Fig. 1.This is to fully take into account various needs, and for example 1, one cover soft initiator can timesharing starts two or multiple motors more; 2, two cover soft initiators can be supplied with a motor, and one is enclosed within usefulness, another set of standby; 3, the input of soft initiator, output have met mechanical switch K1, K4 respectively, can guarantee that it was not with high potential after startup was finished, and can not cause unexpected personal safety accident, also can add chain earthing device in addition in case of necessity; 4, can carry out the On line inspection maintenance; 5, when having fault, electronic switch can substitute with mechanical switch; Deng.But switch is used to such an extent that how can increase cost, and by top described: K2, K3, K4 and ThD, ThE, ThF can save.How can reduce operational mistake and to increase some function with several switches.Specifically should be by equipment manufacturing and Subscriber Unit consult to decide with several switches, this patent is not laid down hard and fast rule.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection range of the present utility model.
Claims (9)
1. soft initiator that is used for the continuous frequency conversion and voltage transformation of motor, comprise the mechanical switch K1 that links to each other with the three phase network power supply, it is characterized in that this soft initiator also comprises the series circuit of being made up of inverter and full-control type high frequency electronic switch Kd, this series circuit and capacitor C
0Be connected in parallel on three-phase diode rectifier bridge output two ends; Described mechanical switch K1 is connected in three-phase diode rectifier bridge input; Described inverter is by six groups of thyristor Th1,1 '～Th6,6 ' forms 3 pairs of brachium pontis, each brachium pontis by two anti-and thyristors form; The mid point of the upper and lower bridge arm of 3 pairs of brachium pontis is drawn lead respectively and is connected to threephase asynchronous machine through mechanical switch K4.
2. soft initiator according to claim 1 is characterized in that, the connected mode of brachium pontis is in the described inverter: Th1 and Th1 ' instead also, Th4 and Th4 ' instead also, both form first pair of brachium pontis at the back of connecting; Th2 and Th2 ' instead also, Th5 and Th5 ' instead also, both form second pair of brachium pontis at the back of connecting; Th3 and Th3 ' instead also, Th6 and Th6 ' instead also, both form the 3rd pair of brachium pontis at the back of connecting.
3. soft initiator according to claim 1 is characterized in that, also comprises inductance L
0Setting, be following in the form any one of being provided with:
A: inductance L
0There are three, are set up in parallel on three leads between mechanical switch K1 and the three-phase diode rectifier bridge input;
B: inductance L
0There is one, is arranged at the output and the capacitor C of three-phase diode rectifier bridge
0Between lead on.
4. according to any described soft initiator in claim 1 or 2, it is characterized in that described threephase asynchronous machine is connected to a mechanical switch K2, mechanical switch K2 and described mechanical switch K1 are connected to the three phase network power supply by same group of lead, three inductance L
0Be set up in parallel with this group lead on.
5. according to any described soft initiator in the claim 1 to 3, it is characterized in that described full-control type high frequency electronic switch Kd has following any one form of the composition:
A: the arbitrary end that is connected on rectifier bridge output by a high frequency electronic switch;
B: by the series connection of a plurality of chips and be encapsulated in and become a high-voltage switch gear in the module, be connected on arbitrary end of rectifier bridge output;
C: be connected into a high-voltage switch gear by a plurality of high frequency electronic switchs, be connected on arbitrary end of rectifier bridge output;
D: be made up of two groups of high voltagehigh frequency electronic switches, the two works in same frequency and same phase; Be series at the two ends of inverter as two Kd/2, promptly be connected to the two ends of three-phase diode rectifier bridge separately.
6. according to any described soft initiator in the claim 1 to 3, it is characterized in that, a LC filter is set between described mechanical switch K4 and the threephase asynchronous machine.
7. according to any described soft initiator in the claim 1 to 3, it is characterized in that, also comprise one group of bidirectional electronic switch ThD, ThE, ThF, be connected in series in respectively between the mid point and mechanical switch K4 of upper and lower bridge arm of 3 pairs of brachium pontis, bidirectional electronic switch ThD, ThE, ThF by two anti-and thyristors form.
8. soft initiator according to claim 7 is characterized in that described threephase asynchronous machine is connected to three phase mains by lead separately, and this lead is provided with a mechanical switch K3, and its two ends are parallel with one group of bidirectional electronic switch Th
A, Th
B, Th
c, bidirectional electronic switch Th
A, Th
B, Th
CBy two anti-and thyristor compositions; ThA, ThB, ThC and ThD, these two groups of switches of ThE, ThF are chain, and both do not allow conducting simultaneously, and the two forms electronic switch.
9. according to any described soft initiator in claim 1 or 2, it is characterized in that described soft initiator is installed on the casing inside of described threephase asynchronous machine, this threephase asynchronous machine becomes the motor that the energy continuous frequency conversion and voltage transformation starts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201582187U CN201690395U (en) | 2010-04-13 | 2010-04-13 | Soft starter for continuous frequency conversion and voltage transformation of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201582187U CN201690395U (en) | 2010-04-13 | 2010-04-13 | Soft starter for continuous frequency conversion and voltage transformation of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201690395U true CN201690395U (en) | 2010-12-29 |
Family
ID=43378672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201582187U Expired - Lifetime CN201690395U (en) | 2010-04-13 | 2010-04-13 | Soft starter for continuous frequency conversion and voltage transformation of motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201690395U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814873A (en) * | 2010-04-13 | 2010-08-25 | 汪槱生 | Soft starter used for continuous frequency conversion and voltage transformation of motor |
| US8587240B2 (en) | 2011-07-20 | 2013-11-19 | Eaton Corporation | Operationally dependent filtering for soft starter current measurements |
| CN105450066A (en) * | 2016-01-13 | 2016-03-30 | 沈阳工业大学 | Novel three-phase two-level inversion apparatus |
-
2010
- 2010-04-13 CN CN2010201582187U patent/CN201690395U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814873A (en) * | 2010-04-13 | 2010-08-25 | 汪槱生 | Soft starter used for continuous frequency conversion and voltage transformation of motor |
| US8587240B2 (en) | 2011-07-20 | 2013-11-19 | Eaton Corporation | Operationally dependent filtering for soft starter current measurements |
| CN105450066A (en) * | 2016-01-13 | 2016-03-30 | 沈阳工业大学 | Novel three-phase two-level inversion apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101229 Effective date of abandoning: 20120530 |