CN202889263U - Two-phase chopping voltage-regulating soft starter - Google Patents
Two-phase chopping voltage-regulating soft starter Download PDFInfo
- Publication number
- CN202889263U CN202889263U CN 201220578651 CN201220578651U CN202889263U CN 202889263 U CN202889263 U CN 202889263U CN 201220578651 CN201220578651 CN 201220578651 CN 201220578651 U CN201220578651 U CN 201220578651U CN 202889263 U CN202889263 U CN 202889263U
- Authority
- CN
- China
- Prior art keywords
- phase
- chopping
- voltage regulation
- regulation circuit
- cross streams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The utility model relates to a two-phase chopping voltage-regulating soft starter. The first path of a three-phase alternating-current power supply is connected with the phase A of a three-phase asynchronous motor through an alternating-current chopping voltage-regulating circuit of phase A, and the second path is connected with the phase B of the three-phase asynchronous motor through an alternating-current chopping voltage-regulating circuit of phase B, and the third path is connected with the phase C of the three-phase alternating-current asynchronous motor through an alternating-current chopping voltage-regulating circuit of phase C; the first path output by a singlechip is simultaneously connected with alternating-current chopping voltage-regulating circuits of phases A, B and C, and the second path is connected with an insulated gate electrode bipolar transistor which is in direct-current side connection with a three-phase uncontrollable rectifier bridge; and the three-phase uncontrollable rectifier bridge is respectively connected between the alternating-current chopping voltage-regulating circuits of phases A, B and C and the phases A, B and C of the three-phase alternating-current asynchronous motor. The soft starter can be continued, so that the pulsation component of a starting torque can be greatly reduced, the starting can be more stably.
Description
Technical field
The utility model relates to a kind of three-phase alternating current chopper control soft starter.
Background technology
At present, common soft starter mainly adopts the three-phase thyristor reduced-voltage starting, and it adopts every antiparallel two thyristors or bidirectional thyristor of being connected in series mutually at circuit structure, realizes reduced voltage starting by the ON time that changes every phase voltage.There are two significant drawbacks in the method.One, starting torque is little, the three-phase AC asynchronous motor starting torque be proportional to starting voltage square, when lower voltage, torque reduces with square multiple that starting voltage reduces; Its two, discontinuous current because thyristor belongs to half control type device, only has when its forward conduction electric current drops to zero and could turn-off, so use the thyristor soft-start by lowering voltage, intermittently there is larger pulsating torque in electric current certainty.
Frequency converter also has and is used as soft starter, although effect is better, frequency converter belongs to the AC-DC-AC structure technically.It at first carries out three phase worker power the uncontrollable rectification of three-phase bridge, then the rectification output dc voltage is carried out filtering, adopts at last all adjustable controlled alternating voltages of pulse width modulation (PWM) technology export electric voltage frequency.Frequency changer, technical sophistication, cost is higher, is not easy in the penetration and promotion of Soft Starter for AC Motor field.
Also exist at present a kind of discrete variable frequency pressure regulation Start Technology, it utilizes half control characteristic of thyristor, to the three-phase main-frequency AC power, and selectively conducting, thereby voltage (n=1,2, the 3...) waveform of formation 50/nHz.This technology has three significant drawbacks, first, the discrete variable frequency soft starter can only provide the voltage of the discrete point in frequency such as 50Hz, 25Hz, 16.7Hz/3,12.5Hz, belongs to the soft start of classification discrete variable frequency, and still there is the larger situation of impulse current in the switching between every two-stage, second, the discrete variable frequency soft start provides supply harmonic content large, and in fact imbalance of three-phase voltage is difficult to use in soft start, the 3rd, the discrete variable frequency soft start also exists the shortcoming of discontinuous current.
In sum, Start Technology generally adopts half control type device thyristor to realize soft-start by lowering voltage at present, exists the characteristics that discontinuous current, pulsating torque component are large, detent torque is low.
The utility model content
The technical problem that the utility model solves provides that a kind of alternating current machine starting current is continuous, and the starting torque flutter component also reduces greatly, and starting is three-phase alternating current chopper control soft starter more stably also.
For solving above-mentioned technical problem, the technical scheme that the utility model is taked:
A kind of three-phase alternating current chopper control soft starter, its special character is: comprise three-phase alternating-current supply, single-chip microcomputer, A cross streams voltage regulation circuit of chopping, B cross streams voltage regulation circuit of chopping, C cross streams voltage regulation circuit of chopping, the uncontrollable rectifier bridge of three-phase, three-phase AC asynchronous motor, the first via of three-phase alternating-current supply is connected with the A of three-phase AC asynchronous motor through A cross streams voltage regulation circuit of chopping, the second the tunnel is connected with the B of three-phase AC asynchronous motor through B cross streams voltage regulation circuit of chopping, and Third Road is connected with the C of three-phase AC asynchronous motor through C cross streams voltage regulation circuit of chopping; The output of single-chip microcomputer divides three the tunnel to connect, the first via is connected with A cross streams voltage regulation circuit of chopping, B cross streams voltage regulation circuit of chopping, C cross streams voltage regulation circuit of chopping simultaneously, the second the tunnel is connected with the insulated gate bipolar transistor of the uncontrollable rectifier bridge direct current of three-phase side joint, Third Road be arranged on A cross streams voltage regulation circuit of chopping and be connected with current transformer between the three-phase AC asynchronous motor; The uncontrollable rectifier bridge of three-phase divide three tunnel A that are connected to A cross streams voltage regulation circuit of chopping and three-phase AC asynchronous motor mutually between, the B of B cross streams voltage regulation circuit of chopping and three-phase AC asynchronous motor mutually between, three-phase alternating-current supply and three-phase AC asynchronous motor the C phase between.
The output of above-mentioned single-chip microcomputer be arranged on A cross streams voltage regulation circuit of chopping 3 and be connected with current transformer between the three-phase AC asynchronous motor.
Above-mentioned A cross streams voltage regulation circuit of chopping is made of insulated gate bipolar transistor IGBT1, insulated gate bipolar transistor IGBT2 inverse parallel.
Above-mentioned B cross streams voltage regulation circuit of chopping is made of insulated gate bipolar transistor IGBT3, insulated gate bipolar transistor IGBT4 inverse parallel.
Above-mentioned C cross streams voltage regulation circuit of chopping is made of insulated gate bipolar transistor IGBT5, insulated gate bipolar transistor IGBT6 inverse parallel.
The trigger impulse of above-mentioned insulated gate bipolar transistor IGBT1, insulated gate bipolar transistor IGBT2, insulated gate bipolar transistor IGBT3, insulated gate bipolar transistor IGBT4, insulated gate bipolar transistor IGBT5, insulated gate bipolar transistor IGBT6 is identical.
The uncontrollable rectifier bridge of above-mentioned three-phase comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D1 and diode D2 series connection consist of first order diode, diode D3 and diode D4 series connection consist of second level diode, diode D5 and diode D6 series connection consist of third level diode, and three grades of diodes in parallels consist of the uncontrollable rectifier bridge of three-phase.
Be connected with parallel connection protection circuit on the above-mentioned A cross streams voltage regulation circuit of chopping.
Be connected with parallel connection protection circuit on the above-mentioned B cross streams voltage regulation circuit of chopping.
Be connected with parallel connection protection circuit on the above-mentioned C cross streams voltage regulation circuit of chopping.
Compared with prior art, the beneficial effects of the utility model:
The utility model adopts full-control type device isolation gate bipolar transistor (IGBT) to realize the AC chopping voltage-regulating technique.Because the trigger impulse cycle of IGBT is much smaller than power frequency period, although the alternating current machine starting current still has less pulsation, can be continuous, the starting torque flutter component also reduces greatly, starts also more steady.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Referring to Fig. 1, the utility model comprises three-phase alternating-current supply 1, single-chip microcomputer 2, A cross streams voltage regulation circuit of chopping 3, B cross streams voltage regulation circuit of chopping 4, C cross streams voltage regulation circuit of chopping 5, the uncontrollable rectifier bridge 6 of three-phase, three-phase AC asynchronous motor 10, the first via of three-phase alternating-current supply 1 is connected with the A of three-phase AC asynchronous motor 10 through A cross streams voltage regulation circuit of chopping 3, the second the tunnel is connected with the B of three-phase AC asynchronous motor 10 through B cross streams voltage regulation circuit of chopping 4, and Third Road is connected with the C of three-phase AC asynchronous motor 10 through C cross streams voltage regulation circuit of chopping 5; The output of single-chip microcomputer 2 divides three the tunnel to connect, the first via is connected with A cross streams voltage regulation circuit of chopping 3, B cross streams voltage regulation circuit of chopping 4, C cross streams voltage regulation circuit of chopping 5 simultaneously, the second the tunnel is connected with the insulated gate bipolar transistor 6 of the uncontrollable rectifier bridge 5 direct current side joints of three-phase, Third Road be arranged on A cross streams voltage regulation circuit of chopping 3 and be connected with current transformer 8 between the three-phase AC asynchronous motor 9; The A that the uncontrollable rectifier bridge of three-phase was connected to A cross streams voltage regulation circuit of chopping 3 and three-phase AC asynchronous motor 10 in 6 minutes three tunnel mutually between, the B of B cross streams voltage regulation circuit of chopping 4 and three-phase AC asynchronous motor 10 mutually between, C cross streams voltage regulation circuit of chopping 5 and three-phase AC asynchronous motor 10 the C phase between.
The output of above-mentioned single-chip microcomputer 2 be arranged on A cross streams voltage regulation circuit of chopping 3 and be connected with current transformer 9 between the three-phase AC asynchronous motor 10.
Above-mentioned A cross streams voltage regulation circuit of chopping 3 is made of insulated gate bipolar transistor IGBT1, insulated gate bipolar transistor IGBT2 inverse parallel.
Above-mentioned B cross streams voltage regulation circuit of chopping 4 is made of insulated gate bipolar transistor IGBT3, insulated gate bipolar transistor IGBT4 inverse parallel.
Above-mentioned C cross streams voltage regulation circuit of chopping 5 is made of insulated gate bipolar transistor IGBT5, insulated gate bipolar transistor IGBT6 inverse parallel.
The trigger impulse of above-mentioned insulated gate bipolar transistor IGBT1, insulated gate bipolar transistor IGBT2, insulated gate bipolar transistor IGBT3, insulated gate bipolar transistor IGBT4, insulated gate bipolar transistor IGBT5, insulated gate bipolar transistor IGBT6 is identical.
The uncontrollable rectifier bridge 6 of above-mentioned three-phase comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D1 and diode D2 series connection consist of first order diode, diode D3 and diode D4 series connection consist of second level diode, diode D5 and diode D6 series connection consist of third level diode, and three grades of diodes in parallels consist of the uncontrollable rectifier bridge 6 of three-phase.
Be connected with parallel connection protection circuit 8 on the above-mentioned A cross streams voltage regulation circuit of chopping 3.
Be connected with parallel connection protection circuit 8 on the above-mentioned B cross streams voltage regulation circuit of chopping 4.
Be connected with parallel connection protection circuit 8 on the above-mentioned C cross streams voltage regulation circuit of chopping 5.
On main circuit structure, adopt six insulated gate bipolar transistors, per two inverse parallels connect, consist of three groups of A cross streams voltage regulation circuit of chopping 3, B cross streams voltage regulation circuit of chopping 4, C cross streams voltage regulation circuit of chopping 5, be serially connected in respectively between the A phase, B phase, C phase stator winding of three-phase alternating-current supply 1 and three-phase AC asynchronous motor 10.In addition with six diodes, consist of the uncontrollable rectifier bridge 6 of three-phase bridge, the AC of the uncontrollable rectifier bridge of three-phase is connected between AC voltage adjusting circuit and the three-phase AC asynchronous motor stator winding insulated gate bipolar transistor 7 of the direct current side joint of the uncontrollable rectifier bridge of three-phase.In order to protect the insulated gate bipolar transistor, each insulated gate bipolar transistor is parallel with RC series connection protective circuit.In order to detect and control starting current, at the A of three-phase AC asynchronous motor side phase power line a current transformer 9 is set, the current signal that current transformer detects is sent into single-chip microcomputer 2.
In main circuit control, the control impuls that Single Chip Microcomputer (SCM) system produces has two-way, one tunnel pulse-triggered A cross streams voltage regulation circuit of chopping 3, B cross streams voltage regulation circuit of chopping 4,5 three groups of group AC chopping voltage-regulating devices of C cross streams voltage regulation circuit of chopping, the insulated gate bipolar transistor 7 of the uncontrollable rectifier bridge DC side of another road pulse-triggered three-phase, the two-way pulse is positive and negative fully opposite, and pulse frequency is 1KHz.Like this, in A cross streams voltage regulation circuit of chopping 3, B cross streams voltage regulation circuit of chopping 4, C cross streams voltage regulation circuit of chopping 5 triggering and conducting constantly, insulated gate bipolar transistor 7 turn-offs, three-phase alternating-current supply 1 is powered to three-phase AC asynchronous motor, when A cross streams voltage regulation circuit of chopping 3, B cross streams voltage regulation circuit of chopping 4,5 shutoff of C cross streams voltage regulation circuit of chopping, insulated gate bipolar transistor 7 triggering and conducting, the three-phase AC asynchronous motor stator current is by uncontrollable rectifier bridge 6 afterflows of three-phase.
On control algolithm, in order to realize control of soft or the soft stop control to three-phase AC asynchronous motor.Two kinds of control modes are specifically arranged.One is finished ramp voltage by default curve and is started.A kind of open loop control mode namely, this situation can not arrange current transformer 9, according to minimum voltage Umin and the starting time of calculated in advance, and the duty cycle alpha of linear regulation chopping modulation pulse, until α is 100%, output voltage is the full voltage of three-phase alternating voltage.At this moment, the bypass three-phase ac contactor that can establish by other switches to three-phase AC asynchronous motor on the three-phase alternating-current supply.Finish the ramp voltage soft start of three-phase AC asynchronous motor.Its two, principal of constant current soft.The default maximum starting current Imax that allows in single-chip microcomputer, detect current actual current I by current transformer 9, in Single Chip Microcomputer (SCM) system, arrange one with the Digital PID Controller of amplitude limit output, the deviation that is input as the maximum starting current Imax of permission and actual current I of PID controller, the PID controller is output as the duty cycle alpha of chopping modulation pulse, be limited to 100% in the output of PID controller, be limited to 0% down.
In the formula, T is the current sample cycle, and k is k sampling period, and Ti is PID controller integration time constant, and Td is PID controller derivative time constant.
If realize the soft stop function of three-phase AC asynchronous motor, can regulate by the rightabout of ramp voltage soft start the duty cycle alpha of chopping modulation pulse, α is progressively reduced by 100%, and this moment, the effective value of output AC voltage progressively reduced, until realize soft stop.
The utility model and three-phase thyristor pressure regulation Start Technology are done the emulation experiment contrast, experimental subjects is selected the three-phase AC asynchronous motor of rated power 15KW, rated voltage 400V, rated frequency 50Hz, motor load is got 15Nm, experimental situation, MatlabR2008a.
Contrast 1: identical output fundamental voltage effective value, identical load.
Three-phase thyristor pressure regulation soft start, thyristor Trigger Angle are set to 90 degree, and during symmetrical three-phase pure resistor load, output line voltage first-harmonic effective value is 175.4V, total harmonic distortion: 60.85%, and starting current 150A.
The soft start of three-phase chopper control, the trigger impulse duty ratio gets 46%, output line fundamental voltage effective value 175.4V, total harmonic distortion 101%, starting current 130A.
Can be found out by top data, under same base wave voltage effective value, the starting current of two-phase chopping modulation soft start is less.Although the harmonic content of two-phase chopping modulation soft start is larger, its harmonic wave is mainly high order harmonic component (19 times, 21 times, 49 times, 51 inferior), and the alternating current of generation is less, and is less on the motor impact.
Contrast 2: allow maximum starting current (5 times of rated current, 150A) under the same case, it is 95Nm that the soft start of three-phase chopper control can be started maximum load, and three-phase thyristor pressure regulation soft start to start maximum load be 85Nm.
Claims (10)
1. three-phase alternating current chopper control soft starter, it is characterized in that: comprise three-phase alternating-current supply (1), single-chip microcomputer (2), A cross streams voltage regulation circuit of chopping (3), B cross streams voltage regulation circuit of chopping (4), C cross streams voltage regulation circuit of chopping (5), the uncontrollable rectifier bridge of three-phase (6), three-phase AC asynchronous motor (10), the first via of three-phase alternating-current supply (1) is connected through the A of A cross streams voltage regulation circuit of chopping (3) with three-phase AC asynchronous motor (10), the second the tunnel is connected through the B of B cross streams voltage regulation circuit of chopping (4) with three-phase AC asynchronous motor (10), and Third Road is connected through the C of C cross streams voltage regulation circuit of chopping (5) with three-phase AC asynchronous motor (10); The output of single-chip microcomputer (2) divides three the tunnel to connect, the first via is connected with A cross streams voltage regulation circuit of chopping (3), B cross streams voltage regulation circuit of chopping (4), C cross streams voltage regulation circuit of chopping (5) simultaneously, the second the tunnel is connected with the insulated gate bipolar transistor (6) of the uncontrollable rectifier bridge of three-phase (5) direct current side joint, Third Road be arranged on A cross streams voltage regulation circuit of chopping (3) and be connected with current transformer (8) between the three-phase AC asynchronous motor (9); The A that the uncontrollable rectifier bridge of three-phase (6) Fen Sanlu is connected to A cross streams voltage regulation circuit of chopping (3) and three-phase AC asynchronous motor (10) mutually between, the B of B cross streams voltage regulation circuit of chopping (4) and three-phase AC asynchronous motor (10) mutually between, three-phase alternating-current supply (1) and three-phase AC asynchronous motor (10) the C phase between.
2. a kind of three-phase alternating current chopper control soft starter according to claim 1 is characterized in that: the output of described single-chip microcomputer (2) be arranged on A cross streams voltage regulation circuit of chopping (3) and be connected with current transformer (9) between the three-phase AC asynchronous motor (10).
3. a kind of three-phase alternating current chopper control soft starter according to claim 1 and 2, it is characterized in that: described A cross streams voltage regulation circuit of chopping (3) is made of insulated gate bipolar transistor IGBT1, insulated gate bipolar transistor IGBT2 inverse parallel.
4. a kind of three-phase alternating current chopper control soft starter according to claim 3, it is characterized in that: described B cross streams voltage regulation circuit of chopping (4) is made of insulated gate bipolar transistor IGBT3, insulated gate bipolar transistor IGBT4 inverse parallel.
5. a kind of three-phase alternating current chopper control soft starter according to claim 4, it is characterized in that: described C cross streams voltage regulation circuit of chopping (5) is made of insulated gate bipolar transistor IGBT5, insulated gate bipolar transistor IGBT6 inverse parallel.
6. a kind of three-phase alternating current chopper control soft starter according to claim 5, it is characterized in that: the trigger impulse of described insulated gate bipolar transistor IGBT1, insulated gate bipolar transistor IGBT2, insulated gate bipolar transistor IGBT3, insulated gate bipolar transistor IGBT4, insulated gate bipolar transistor IGBT5, insulated gate bipolar transistor IGBT6 is identical.
7. a kind of three-phase alternating current chopper control soft starter according to claim 6, it is characterized in that: the uncontrollable rectifier bridge of described three-phase (6) comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D1 and diode D2 series connection consist of first order diode, diode D3 and diode D4 series connection consist of second level diode, diode D5 and diode D6 series connection consist of third level diode, and three grades of diodes in parallels consist of the uncontrollable rectifier bridge of three-phase (6).
8. a kind of three-phase alternating current chopper control soft starter according to claim 7 is characterized in that: be connected with parallel connection protection circuit (8) on the described A cross streams voltage regulation circuit of chopping (3).
9. a kind of three-phase alternating current chopper control soft starter according to claim 8 is characterized in that: be connected with parallel connection protection circuit (8) on the described B cross streams voltage regulation circuit of chopping (4).
10. a kind of three-phase alternating current chopper control soft starter according to claim 9 is characterized in that: be connected with parallel connection protection circuit (8) on the described C cross streams voltage regulation circuit of chopping (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220578651 CN202889263U (en) | 2012-11-06 | 2012-11-06 | Two-phase chopping voltage-regulating soft starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220578651 CN202889263U (en) | 2012-11-06 | 2012-11-06 | Two-phase chopping voltage-regulating soft starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202889263U true CN202889263U (en) | 2013-04-17 |
Family
ID=48080649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220578651 Expired - Fee Related CN202889263U (en) | 2012-11-06 | 2012-11-06 | Two-phase chopping voltage-regulating soft starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202889263U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916626A (en) * | 2012-11-06 | 2013-02-06 | 陕西科技大学 | Three-phase chopper control soft starter |
-
2012
- 2012-11-06 CN CN 201220578651 patent/CN202889263U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916626A (en) * | 2012-11-06 | 2013-02-06 | 陕西科技大学 | Three-phase chopper control soft starter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Manias | Power electronics and motor drive systems | |
| US9099934B2 (en) | Three phase active rectifier system | |
| CN102232265B (en) | Alternating current-direct current converting apparatus and apparatus for driving electric machinery | |
| US6847531B2 (en) | System and method for regenerative PWM AC power conversion | |
| CN103633910B (en) | A kind of space vector of voltage control device and its control method for soft start | |
| EP2652873A1 (en) | Resonant tank drive circuits for current-controlled semiconductor devices | |
| JP4051875B2 (en) | Rectifier circuit and control method thereof | |
| CN102110990B (en) | Wind power generation system based on reverse loose matrix converter and method thereof | |
| CN105939133A (en) | Continuous variable frequency soft starter and control method thereof | |
| KR20190072600A (en) | Hybrid rectifier | |
| CN100468947C (en) | AC motor matrix type controller with DC excitation function | |
| CN104995831B (en) | For soft start motor and AC to the AC converters and its operating method of other application | |
| CN102916626A (en) | Three-phase chopper control soft starter | |
| US11264918B2 (en) | Isolated inverters | |
| US10211752B2 (en) | Direct-current power supply device and refrigeration cycle-applied apparatus | |
| Vinodhini et al. | Single phase to single phase step-down cycloconverter for electric traction applications | |
| CN204376731U (en) | A kind of four-quadrant frequency converter | |
| CN106329946A (en) | Silicon-controlled synchronous trigger circuit and frequency converter | |
| CN109660158A (en) | Motor constant speed control circuit and method | |
| CN202889263U (en) | Two-phase chopping voltage-regulating soft starter | |
| Yamada et al. | A battery charger with 3-phase 3-level T-type PFC | |
| CN202889262U (en) | Complementary pulse two-phase voltage-regulating soft starter | |
| CN202889264U (en) | Two-phase chopping voltage-regulating soft starter | |
| CN109301846A (en) | Uneven low-voltage controlling device and method | |
| CN102946217B (en) | Two-phase chopper control soft starter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20131106 |