CN202889262U - Complementary pulse two-phase voltage-regulating soft starter - Google Patents
Complementary pulse two-phase voltage-regulating soft starter Download PDFInfo
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- CN202889262U CN202889262U CN 201220578624 CN201220578624U CN202889262U CN 202889262 U CN202889262 U CN 202889262U CN 201220578624 CN201220578624 CN 201220578624 CN 201220578624 U CN201220578624 U CN 201220578624U CN 202889262 U CN202889262 U CN 202889262U
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Abstract
The utility model relates to a complementary pulse two-phase voltage-regulating soft starter. A three-phase alternating-current power supply of the soft starter is connected with phases A, B and C of a three-phase alternating-current asynchronous motor through voltage-regulating circuits of phases A, B and C; a first output path of a singlechip is connected with the voltage-regulating circuits of phases A and B simultaneously, a second path is connected with a third insulated gate electrode bipolar transistor which is in direct-current side connection with a freewheeling circuit of the three-phase alternating-current asynchronous motor, and a third path is respectively connected with current transformers which are arranged between the voltage-regulating circuits of phases A and B and the three-phase alternating-current asynchronous motor; the freewheeling circuit of the three-phase alternating-current asynchronous motor is respectively connected between the voltage regulating circuits of phases A and B and the phases A and B of the three-phase alternating-current asynchronous motor, and between a three-phase alternating current power supply and the phase 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, the number of IGBTs (insulated gate bipolar transistors) can be reduced, and the cost can be saved.
Description
Technical field
The utility model is related to a kind of complementary pulse two-phase pressure regulation 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 direct voltage of rectification output is carried out filtering, adopts at last all adjustable controlled alternating currents of pulse width modulation (PWM) technology export electric voltage frequency.Frequency changer, technical sophistication, cost is higher, is not easy to penetration and promotion.
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.The 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.These factors also are the reasons that causes discrete variable frequency soft starter in the market to fail to popularize.
To sum up, 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 provide a kind of can be continuous, the starting torque flutter component also reduces greatly, starting is complementary pulse two-phase pressure regulation soft starter more stably also.
For solving above-mentioned technical problem, the technical scheme that the utility model is taked:
A kind of complementary pulse two-phase pressure regulation soft starter, its special character is: comprise three-phase alternating-current supply, single-chip microcomputer, A phase regulating circuit, B phase regulating circuit, 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 phase regulating circuit, the second the tunnel is connected with the B of three-phase AC asynchronous motor through B phase regulating circuit, and Third Road is connected with the C of three-phase AC asynchronous motor; The output of single-chip microcomputer divides three the tunnel to connect, the first via is connected with A phase regulating circuit, B phase regulating circuit simultaneously, the second the tunnel is connected with the 3rd insulated gate bipolar transistor of three-phase alternating current similarities and differences steps motor freewheeling circuit direct current side joint, Third Road respectively be arranged on current transformer between A phase regulating circuit and the three-phase AC asynchronous motor, be arranged on B phase regulating circuit and be connected with current transformer between the three-phase AC asynchronous motor; Three-phase alternating current similarities and differences steps motor freewheeling circuit divide three tunnel A that are connected to A phase regulating circuit and three-phase AC asynchronous motor mutually between, between the B phase of B phase regulating circuit and three-phase AC asynchronous motor, between the C phase of three-phase alternating-current supply and three-phase AC asynchronous motor.
Above-mentioned A phase regulating circuit is by Power Diode Pumped D7, Power Diode Pumped D8, Power Diode Pumped D9, Power Diode Pumped D10, the first insulated gate bipolar transistor; Power Diode Pumped D7, Power Diode Pumped D8 series connection consists of first order diode; Power Diode Pumped D7, Power Diode Pumped D8 series connection consists of second level diode; first order diode and second level diodes in parallel; the first insulated gate bipolar transistor in parallel between first order diode and the second level diode is parallel with the first protective circuit and consists of on the first insulated gate bipolar transistor.
Above-mentioned B phase regulating circuit is by Power Diode Pumped D11, Power Diode Pumped D12, Power Diode Pumped D13, Power Diode Pumped D14, the second insulated gate bipolar transistor; Power Diode Pumped D11, Power Diode Pumped D12 series connection consists of first order diode; Power Diode Pumped D13, Power Diode Pumped D14 series connection consists of second level diode; first order diode and second level diodes in parallel; the first insulated gate bipolar transistor in parallel between first order diode and the second level diode is parallel with the first protective circuit and consists of on the second insulated gate bipolar transistor.
Above-mentioned the first insulated gate bipolar transistor, the transistorized trigger impulse of the second insulated gate bipolar are identical.
Above-mentioned three-phase alternating current similarities and differences step motor freewheeling circuit 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 three-phase alternating current similarities and differences step motor freewheeling circuit.
Be parallel with the 3rd protective circuit on the 3rd above-mentioned insulated gate bipolar transistor.
Compared with prior art, the beneficial effects of the utility model:
The utility model adopts complementary pulse-triggered full-control type device isolation grid bipolar transistors (IGBT) to realize the AC voltage adjusting technology, 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, but can be continuous, the starting torque flutter component also reduces greatly, start also more steady, in addition, take alternating current machine C phase winding terminal voltage as reference-potential point, when obtaining same rotating magnetic flux, only need to A, the AC power that the B winding provides mutual deviation 60 degree both can, therefore only need the A to three-phase AC asynchronous motor, the B two-phase is carried out pressure regulation, can reduce like this quantity of IGBT, save cost.
Description of drawings
Fig. 1 is circuit connection 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 4, single-chip microcomputer 5, A phase regulating circuit 1, B phase regulating circuit 2, the uncontrollable rectifier bridge 5 of three-phase, three-phase AC asynchronous motor 14, the first via of three-phase alternating-current supply 4 is connected with the A of three-phase AC asynchronous motor 14 through A phase regulating circuit 1, the second the tunnel is connected with the B of three-phase AC asynchronous motor 14 through B phase regulating circuit 2, and Third Road is connected with the C of three-phase AC asynchronous motor 14; The output of single-chip microcomputer 5 divides three the tunnel to connect, the first via is connected with A phase regulating circuit 1, B phase regulating circuit 2 simultaneously, the second the tunnel is connected with the 3rd insulated gate bipolar transistor 6 of three-phase alternating current similarities and differences steps motor freewheeling circuit 3 direct current side joints, Third Road respectively be arranged on current transformer 12 between A phase regulating circuit 1 and the three-phase AC asynchronous motor 14, be arranged on B phase regulating circuit 2 and be connected with current transformer 13 between the three-phase AC asynchronous motor 14; The A that three-phase alternating current similarities and differences steps motor freewheeling circuit was connected to A phase regulating circuit 1 and three-phase AC asynchronous motor 14 in 3 minutes three tunnel mutually between, between the B phase of B phase regulating circuit 2 and three-phase AC asynchronous motor 14, between the C phase of three-phase alternating-current supply 4 and three-phase AC asynchronous motor 14.
Above-mentioned A phase regulating circuit 1 is by Power Diode Pumped D7, Power Diode Pumped D8, Power Diode Pumped D9, Power Diode Pumped D10, the first insulated gate bipolar transistor 8; Power Diode Pumped D7, Power Diode Pumped D8 series connection consists of first order diode; Power Diode Pumped D7, Power Diode Pumped D8 series connection consists of second level diode; first order diode and second level diodes in parallel; being parallel with the first protective circuit 9 between first order diode and the second level diode on the first insulated gate bipolar transistor 8, the first insulated gate bipolar transistors 8 in parallel consists of.
Above-mentioned B phase regulating circuit 2 is by Power Diode Pumped D11; Power Diode Pumped D12; Power Diode Pumped D13; Power Diode Pumped D14; the second insulated gate bipolar transistor 7; Power Diode Pumped D11; Power Diode Pumped D12 series connection consists of first order diode; Power Diode Pumped D13; Power Diode Pumped D14 series connection consists of second level diode; first order diode and second level diodes in parallel; being parallel with the first protective circuit 10 between first order diode and the second level diode on the first insulated gate bipolar transistor 8, the second insulated gate bipolar transistors 7 in parallel consists of.
The first above-mentioned insulated gate bipolar transistor 8, the trigger impulse of the first insulated gate bipolar transistor 8 are identical.
Above-mentioned three-phase alternating current similarities and differences step motor freewheeling circuit 3 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 three-phase alternating current similarities and differences step motor freewheeling circuit 3.
Be parallel with the 3rd protective circuit 11 on the 3rd above-mentioned insulated gate bipolar transistor 6.
On main circuit structure; adopt respectively four Power Diode Pumped and an insulated gate bipolar transistor and corresponding protective circuit; consist of two groups of basic single phase ac regulation circuit, be serially connected in respectively A phase, the B phase power supply end of three-phase AC asynchronous motor.In addition with six Power Diode Pumped and an insulated gate bipolar transistor and corresponding protective circuit thereof; consist of three-phase afterflow bridge 3; the three-phase afterflow is bridged between AC voltage adjusting circuit and the three-phase AC asynchronous motor stator winding; in order to detect and control starting current; on the A of three-phase AC asynchronous motor side phase, B phase power line a current transformer is set respectively, the current signal that current transformer detects is sent into single-chip microcomputer 5.
In main circuit control, the control impuls that single-chip microcomputer 5 produces has two-way, the insulated gate bipolar transistor of two groups of regulating circuits of one tunnel pulse-triggered, the insulated gate bipolar transistor 6 of another road pulse-triggered three-phase afterflow bridge DC side, the two-way pulse is positive and negative fully opposite, be complementary pulse, pulse frequency is 1KHz.Like this, in the first insulated gate bipolar transistor 8, the second insulated gate bipolar transistor 7 triggering and conducting constantly, the 3rd insulated gate bipolar transistor turn-offs, three-phase alternating-current supply is powered to three-phase AC asynchronous motor, at the first insulated gate bipolar transistor 8, when the second insulated gate bipolar transistor 7 turn-offs, the 3rd insulated gate bipolar transistor triggering and conducting, the three-phase AC asynchronous motor stator current is by the afterflow of three-phase afterflow bridge.
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.According to minimum voltage Umin and the starting time of calculated in advance, the duty cycle alpha of linear regulation pressure regulation pulse, until α is 100%, output voltage is the rated voltage of three-phase alternating voltage.At this moment, can establish the bypass three-phase ac contactor by other, three-phase AC asynchronous motor is switched 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 microprocessor control system, detect current actual current I by current transformer, in microprocessor control 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 pressure regulation 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 instant.
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 pressure regulation pulse, α is progressively reduced by 100%, this moment, the effective value of output AC voltage progressively reduced, until realize soft stop.
Claims (6)
1. complementary pulse two-phase pressure regulation soft starter, it is characterized in that: comprise three-phase alternating-current supply (4), single-chip microcomputer (5), A phase regulating circuit (1), B phase regulating circuit (2), the uncontrollable rectifier bridge of three-phase (3), three-phase AC asynchronous motor (14), the first via of three-phase alternating-current supply (4) is connected through the A of A phase regulating circuit (1) with three-phase AC asynchronous motor (14), the second the tunnel is connected through the B of B phase regulating circuit (2) with three-phase AC asynchronous motor (14), and Third Road is connected with the C of three-phase AC asynchronous motor (14); The output of single-chip microcomputer (5) divides three the tunnel to connect, the first via is connected with A phase regulating circuit (1), B phase regulating circuit (2) simultaneously, the second the tunnel is connected with the 3rd insulated gate bipolar transistor (6) of three-phase alternating current similarities and differences steps motor freewheeling circuit (3) direct current side joint, Third Road respectively be arranged on current transformer (12) between A phase regulating circuit (1) and the three-phase AC asynchronous motor (14), be arranged on B phase regulating circuit (2) and be connected with current transformer (13) between the three-phase AC asynchronous motor (14); The A that three-phase alternating current similarities and differences steps motor freewheeling circuit (3) Fen Sanlu is connected to A phase regulating circuit (1) and three-phase AC asynchronous motor (14) mutually between, between the B phase of B phase regulating circuit (2) and three-phase AC asynchronous motor (14), between the C phase of three-phase alternating-current supply (4) and three-phase AC asynchronous motor (14).
2. a kind of complementary pulse two-phase pressure regulation soft starter according to claim 1; it is characterized in that: described A phase regulating circuit (1) is by Power Diode Pumped D7; Power Diode Pumped D8; Power Diode Pumped D9; Power Diode Pumped D10; the first insulated gate bipolar transistor (8); Power Diode Pumped D7; Power Diode Pumped D8 series connection consists of first order diode; Power Diode Pumped D7; Power Diode Pumped D8 series connection consists of second level diode; first order diode and second level diodes in parallel; the first insulated gate bipolar transistor (8) in parallel between first order diode and the second level diode is parallel with the first protective circuit (9) and consists of on the first insulated gate bipolar transistor (8).
3. a kind of complementary pulse two-phase pressure regulation soft starter according to claim 1 and 2; it is characterized in that: described B phase regulating circuit (2) is by Power Diode Pumped D11; Power Diode Pumped D12; Power Diode Pumped D13; Power Diode Pumped D14; the second insulated gate bipolar transistor (7); Power Diode Pumped D11; Power Diode Pumped D12 series connection consists of first order diode; Power Diode Pumped D13; Power Diode Pumped D14 series connection consists of second level diode; first order diode and second level diodes in parallel; the first insulated gate bipolar transistor (8) in parallel between first order diode and the second level diode is parallel with the first protective circuit (10) and consists of on the second insulated gate bipolar transistor (7).
4. a kind of complementary pulse two-phase pressure regulation soft starter according to claim 3, it is characterized in that: the trigger impulse of described the first insulated gate bipolar transistor (8), the second insulated gate bipolar transistor (7) is identical.
5. a kind of complementary pulse two-phase pressure regulation soft starter according to claim 4, it is characterized in that: described three-phase alternating current similarities and differences step motor freewheeling circuits (3) comprise 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 three-phase alternating current similarities and differences step motor freewheeling circuit (3).
6. a kind of complementary pulse two-phase pressure regulation soft starter according to claim 5 is characterized in that: be parallel with the 3rd protective circuit (11) on described the 3rd insulated gate bipolar transistor (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220578624 CN202889262U (en) | 2012-11-06 | 2012-11-06 | Complementary pulse two-phase voltage-regulating soft starter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220578624 CN202889262U (en) | 2012-11-06 | 2012-11-06 | Complementary pulse two-phase voltage-regulating soft starter |
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| CN202889262U true CN202889262U (en) | 2013-04-17 |
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| CN 201220578624 Expired - Fee Related CN202889262U (en) | 2012-11-06 | 2012-11-06 | Complementary pulse two-phase voltage-regulating soft starter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916625A (en) * | 2012-11-06 | 2013-02-06 | 陕西科技大学 | Complementary-pulse two-phase voltage regulation soft starter |
| CN103855775A (en) * | 2014-03-25 | 2014-06-11 | 陕西科技大学 | Super-capacitor charging control device |
-
2012
- 2012-11-06 CN CN 201220578624 patent/CN202889262U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916625A (en) * | 2012-11-06 | 2013-02-06 | 陕西科技大学 | Complementary-pulse two-phase voltage regulation soft starter |
| CN102916625B (en) * | 2012-11-06 | 2015-11-04 | 陕西科技大学 | Complementary pulse two-phase soft starter |
| CN103855775A (en) * | 2014-03-25 | 2014-06-11 | 陕西科技大学 | Super-capacitor charging control device |
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| Date | Code | Title | Description |
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| 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 |