CN202172377U - Discrete variable frequency stepless voltage regulation soft starting device based on speedless sensor - Google Patents
Discrete variable frequency stepless voltage regulation soft starting device based on speedless sensor Download PDFInfo
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- CN202172377U CN202172377U CN2011202697426U CN201120269742U CN202172377U CN 202172377 U CN202172377 U CN 202172377U CN 2011202697426 U CN2011202697426 U CN 2011202697426U CN 201120269742 U CN201120269742 U CN 201120269742U CN 202172377 U CN202172377 U CN 202172377U
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Abstract
The utility model discloses a discrete variable frequency stepless voltage regulation soft starting device based on a speedless sensor, which belongs to the technical field of starting of motors and mainly solves the problems that a starting torque must be seriously reduced when a starting voltage of the conventional soft starting device is reduced and the soft starting device is difficult to start with a heavy load. The device is mainly characterized by comprising a main loop and a main loop control circuit, wherein the main loop is formed by sequentially connecting five groups of conversed-paralleled controlled silicon, the main loop control circuit comprises a digital signal processor (DSP) controller, a current signal zero-crossing detection circuit, a voltage sampling circuit, a current sampling circuit, a synchronous signal acquisition circuit and drive circuits, the voltage sampling circuit and the synchronous signal acquisition circuit are connected between the main loop and a DSP, the current sampling circuit and the current signal zero-crossing detection circuit are connected between the main loop and the DSP, and the drive circuits are connected between control ends of the controlled silicon of the main loop and the DSP. The discrete variable frequency stepless voltage regulation soft starting device has the characteristics of low starting current, high starting torque and smooth switching according to frequency ranges, and is mainly suitable for a starting occasion of a three-phase asynchronous motor with the heady load.
Description
Technical field
The utility model belongs to the motor starting technical field.Be specifically related to a kind of classification frequency conversion stepless voltage regulator that is used for soft start.
Background technology
Motor is widely used in every field such as industrial and mining enterprises, communications and transportation, national defense industry as the electromagnetic and mechanical device of energy converting between mechanical.Wherein, in the various motor that drag load, induction motor has obtained to use more widely with the performance of its high stable.The three phase induction motor soft starting controller is the control appliance that aims at the starting design of motor, and its main circuit adopts cheap (comparing with other power device), and thyristor (SCR) is as power device, and the complete equipment cost is low, and is easy to use.It is according to the thyristor voltage regulation principle, through the trigger angle of adjusting thyristor, thereby controls its ON time, and output voltage is extremely gradually changed greatly by little, thereby has reduced the impact of starting current.But because starting torque is directly proportional for distolateral alive square with motor stator again; So soft device starting of above-mentioned electronic type step-down; There is a serious defective: reduce the inevitable serious starting torque that reduces of starting voltage, make motor band heavy-load start difficult.Therefore, the electronic type soft starter all can only be limited to the occasion that underloading is used.Yet in the application of actual motor, very big some is the starting that requirement can be with the heavy duty or even the fixed load that exceeds the quata, like ball mill, and pulverizer, mine crane, wire drawing machine, the belt conveyor in the colliery etc.These electric motor startings require: little starting current, and high starting torque, the adaptive load ability is strong, can select start mode flexibly according to loading condition.Above-mentioned reduced voltage starting mode can't satisfy these requirements.Though frequency converter can satisfy above-mentioned requirements, frequency converter more is to be applied in the speed governing occasion, and cost is than higher and control complicacy, and for the occasion that does not need speed governing and Fraquent start, obviously cost performance is too low, and the user is difficult to accept.
Summary of the invention
The purpose of the utility model is for the classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor is provided; The big problem of starting current when starting heavy duty to solve existing soft starter; Make it have little starting current, high starting torque is introduced Speedless sensor simultaneously; It is level and smooth to guarantee that each frequency-division section switches, and the device low price.
The technical solution of the utility model is: a kind of classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor; Comprise the major loop and the major loop control circuit that are made up of antiparallel Group of Silicon Controlled Rectifier that are connected between power supply and the motor, it is characterized in that: major loop is made up of five groups of antiparallel controllable silicons that connect successively; The major loop control circuit comprises dsp controller, current signal zero cross detection circuit, voltage sampling circuit, current sampling circuit, synchronous signal acquisition circuit and drive circuit; Wherein, Voltage sampling circuit, synchronous signal acquisition circuit are connected between main circuit power input and the dsp controller; Current sampling circuit, current signal zero cross detection circuit are connected between main circuit power output and the dsp controller, and drive circuit is connected between each SCR control end of major loop and the dsp controller.
Major loop described in the technical solution of the utility model comprises five groups of antiparallel controllable silicons; Wherein, Three groups of antiparallel controllable silicons are serially connected in respectively between three-phase power line and the motor; In addition two groups of antiparallel silicon controlled one ends respectively with three-phase power line in the two-phase power supply line is connected, the other end intersects the motor side connection corresponding with this two-phase power supply line respectively.
Current signal zero cross detection circuit described in the technical solution of the utility model is made up of diode-bridge circuit and isolation optocoupler.
The amplifying circuit that voltage sampling circuit described in the technical solution of the utility model and current sampling circuit are made up of level Four amplifier chip and peripheral component, follow circuit, diode, electric capacity, resistance constitutes.
The comparison circuit that synchronous signal acquisition circuit described in the technical solution of the utility model is formed by the phase shift loop, by comparator and peripheral component and isolate optocoupler and constitute.
The classification frequency conversion stepless voltage regulation method that the utility model is used for soft start comprises following three phases:
Phase I; Dsp controller sends f/4 and triggers drive signal; In 8 half-waves of power frequency supply, remove 4 wave heads wherein according to the optimum way that simulation calculation goes out, and remaining 4 half-waves are carried out chopper control; Through the sampling of current signal and afterflow angle signal, coordinate the control motor speed and switch to next frequency range near to rated speed that should frequency range the time;
Second stage; Dsp controller sends f/2 and triggers drive signal; In 4 half-waves of power frequency supply, remove 2 wave heads wherein according to the optimum way that simulation calculation goes out, and remaining 2 half-waves are carried out chopper control; Through the sampling of current signal and afterflow angle signal, coordinate the control motor speed and switch to next frequency range near to rated speed that should frequency range the time;
Phase III, when rotating speed of motor near 1/2 at full speed the time, dsp controller sends the power frequency triggering signal, promptly each power frequency half-wave of alternating current is carried out chopper control control, realizes that motor is by the transformation of f/4 to f.
Classification frequency conversion mode in the described a kind of classification frequency conversion stepless voltage regulation soft starter device of the utility model is to carry out the division of frequency range according to the mode of f/N, and wherein f is a mains frequency, and Chinese mains frequency is 50Hz; N desirable 1 in theory; 2, the 3......50 natural number has been chosen 50Hz (N=1) in the utility model; 25Hz (N=2), three frequency ranges of 12.5Hz (N=4) are accomplished classification varying frequency starting mode.Stepless voltage regulation mode in the utility model is the chopper control control of carrying out according to the wave head number that current frequency comprises; Guarantee the maximization of each frequency-division section torque; And through detecting the variation at electric machine phase current and afterflow angle; Guarantee that motor near the rated speed of each frequency-division section the time, switches to next frequency range.
The beneficial effect of the utility model is: can realize little starting current through using classification frequency conversion stepless voltage regulation starting technique; The characteristics of high starting torque; And device only increases by two groups of inverse parallel silicon controlled modules on the major loop of ordinary electronic soft starter; Price advantage is obvious than frequency converter, and starting performance is superior to the ordinary electronic soft starter.
The utlity model has little starting current, high starting torque, each frequency-division section switches level and smooth, low-cost characteristics.The utility model is mainly used in threephase asynchronous band heavy-load start occasion.
Description of drawings
Fig. 1 is the classification frequency conversion stepless voltage regulation soft starter device systematic square frame sketch map of the utility model.
Fig. 2 is the classification frequency conversion stepless voltage regulation soft starter device major loop sketch map of the utility model.
Fig. 3 is the classification frequency conversion mode sketch map of the utility model.
Fig. 4 is the testing circuit schematic diagram of the current signal zero passage of the utility model.
Fig. 5 is the current signal of the utility model and the sample circuit schematic diagram of input voltage signal.
Fig. 6 is the synchronous signal acquisition circuit theory diagrams of the utility model.
Embodiment
Further specify the technical characterstic of the utility model below in conjunction with accompanying drawing and specific embodiment.
Extremely shown in Figure 3 like Fig. 1.Comprise major loop and major loop control circuit in the classification frequency conversion stepless voltage regulation soft starter device system schematic based on Speedless sensor.Major loop A is made up of five groups of antiparallel controllable silicons, realizes changing voltage and the frequency that is carried in motor side through the conducting of controlling the bidirectional triode thyristor in the major loop.The major loop control circuit comprises dsp controller, current signal zero cross detection circuit, voltage sampling circuit, current sampling circuit, synchronous signal acquisition circuit and drive circuit; Wherein, Voltage sampling circuit, synchronous signal acquisition circuit are connected between main circuit power input and the dsp controller; Voltage sampling circuit nurses one's health the voltage transformer secondary side output voltage signal to 0 ~ 3.3V; The confession dsp controller is gathered, and the synchronizing signal sample circuit is nursed one's health into square-wave signal with AC signal, as the benchmark moment in each corresponding frequency division cycle of trigger impulse; Current sampling circuit, current signal zero cross detection circuit are connected between main circuit power output and the dsp controller; Drive circuit is connected between each SCR control end of major loop and the dsp controller; Current sampling circuit to 0 ~ 3.3V, supplies the dsp controller collection with the conditioning of current Hall transducer secondary side output signal, and the current over-zero testing circuit is through detecting the thyristor pressure drop signal; And through shaping of bridge-type voltage and isolation optocoupler, the square-wave signal of output certain frequency.The pulse of dsp controller B output drive controlling; Voltage sampling circuit C follows the tracks of the amplitude size of input voltage; Current sampling circuit D tracking means output current, synchronous signal acquisition circuit E provide the benchmark moment of drive controlling pulse, and current signal zero cross detection circuit F provides the output current zero passage constantly; Drive circuit G controls controllable silicon according to the instruction of dsp controller B; Classification frequency conversion stepless voltage regulation soft starter device is according to current sampling data like this, and voltage sample value, the exact value at the motor afterflow angle that current zero-crossing signal and voltage synchronizing signal relatively draw are coordinated the control classification frequency range and taken over seamlessly and the output current effective value; Reach little starting current, the varying frequency starting effect of high starting torque.
The utility model increases by two groups of inverse parallel controllable silicons at traditional controllable silicon major loop; Through controlling five groups of silicon controlled trigger sequences in the different frequency division stages; When changing motor input supply frequency, input terminal voltage is regulated, realize the classification VFC.Progressively promote according to three grades of frequencies in the starting process,, then realize classification frequency conversion stepless voltage regulation Soft Start-up Process up to reach consistent with mains frequency f (50Hz).With three phase sine alternating current conversion method is the crossover frequency through as requested, and the conducting of choose reasonable alternation is merged into one-period with the industrial-frequency alternating current in n cycle.The utility model is the soft start of three grades of frequency conversion stepless voltage regulations, and frequency is divided into three phases by 12.5Hz → 25Hz → 50Hz.Phase I, controller sends f/4 and triggers drive signal, in 8 half-waves of power frequency supply; Optimum way according to simulation calculation goes out is removed 4 wave heads wherein, and remaining 4 half-waves are carried out chopper control, improves starting torque as much as possible; And to make the voltage fundamental frequency that is added in motor be 1/4 of power frequency; Be 12.5Hz,, coordinate the control motor speed and switch to next frequency range near to rated speed that should frequency range the time through the sampling of current signal and afterflow angle signal.Second stage, controller are sent f/2 and are triggered drive signal, in 4 half-waves of power frequency supply; Optimum way according to simulation calculation goes out is removed 2 wave heads wherein; And remaining 2 half-waves are carried out chopper control, improve starting torque as much as possible, and to make the voltage fundamental frequency that is added in motor be 1/2 of power frequency; Be 25Hz, coordinate the control motor speed through the sampling of current signal and afterflow angle signal and switch to next frequency range near to rated speed that should frequency range the time.Phase III, when rotating speed of motor near 1/2 at full speed the time, controller sends the power frequency triggering signal, promptly each power frequency half-wave of alternating current is carried out chopper control control, has so just realized that motor is by the transition process of 25Hz to 50Hz.
Major loop comprises five groups of antiparallel controllable silicons; Wherein, Three groups of antiparallel controllable silicons are serially connected in respectively between three-phase power line and the motor; In addition two groups of antiparallel silicon controlled one ends respectively with three-phase power line in the two-phase power supply line is connected, the other end intersects the motor side connection corresponding with this two-phase power supply line respectively.
As shown in Figure 4.The current signal zero cross detection circuit is isolated optocoupler 6N139 and is constituted by diode-bridge circuit; K1K2 controllable silicon pressure drop signal is as input among Fig. 4, and through R89 resistance current limliting, the voltage that carries out after the shaping through 4 diodes is input to the isolation optocoupler, by optocoupler output end vo output current zero cross signal.
As shown in Figure 5.Voltage sampling circuit and current sampling circuit be by LM324 amplifier chip, diode, and resistance, circuit constitutes; Instrument transformer secondary side signal carries out benchmark lifting at zero point through U11B behind the U11A voltage follow, after U11C carries out ratio adjusting and U11D voltage follow, be input to dsp controller.
As shown in Figure 6.The synchronous signal acquisition circuit is by isolating optocoupler 6N139, and comparator LM339 is used for the resistance of phase shift, and capacitor loop constitutes; By the signal process R1 of voltage transformer secondary side output, VR1, C1, R4 behind the phase shift loop of R7, gets into comparator LM339, after the comparator output signal process is isolated optocoupler 6N139, the output synchronizing signal.
Major loop and current signal zero cross detection circuit, voltage sampling circuit, current sampling circuit, synchronous signal acquisition circuit are custom circuit.
Claims (5)
1. classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor; Comprise the major loop and the major loop control circuit that are made up of antiparallel Group of Silicon Controlled Rectifier that are connected between power supply and the motor, it is characterized in that: major loop is made up of five groups of antiparallel controllable silicons that connect successively; The major loop control circuit comprises dsp controller, current signal zero cross detection circuit, voltage sampling circuit, current sampling circuit, synchronous signal acquisition circuit and drive circuit; Wherein, Voltage sampling circuit, synchronous signal acquisition circuit are connected between main circuit power input and the dsp controller; Current sampling circuit, current signal zero cross detection circuit are connected between main circuit power output and the dsp controller, and drive circuit is connected between each SCR control end of major loop and the dsp controller.
2. the classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor according to claim 1; It is characterized in that: described major loop comprises five groups of antiparallel controllable silicons; Wherein, Three groups of antiparallel controllable silicons are serially connected in respectively between three-phase power line and the motor, in addition two groups of antiparallel silicon controlled one ends respectively with three-phase power line in the two-phase power supply line is connected, the other end intersects the motor side connection corresponding with this two-phase power supply line respectively.
3. the classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor according to claim 1 is characterized in that: described current signal zero cross detection circuit is made up of diode-bridge circuit and isolation optocoupler.
4. the classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor according to claim 2; It is characterized in that: the amplifying circuit that described voltage sampling circuit and current sampling circuit are made up of level Four amplifier chip and peripheral component; Follow circuit; Diode, electric capacity, resistance constitutes.
5. the classification frequency conversion stepless voltage regulation soft starter device based on Speedless sensor according to claim 2 is characterized in that: the comparison circuit that described synchronous signal acquisition circuit is formed by the phase shift loop, by comparator and peripheral component and isolate optocoupler and constitute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202697426U CN202172377U (en) | 2011-07-28 | 2011-07-28 | Discrete variable frequency stepless voltage regulation soft starting device based on speedless sensor |
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| CN2011202697426U CN202172377U (en) | 2011-07-28 | 2011-07-28 | Discrete variable frequency stepless voltage regulation soft starting device based on speedless sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904492A (en) * | 2011-07-28 | 2013-01-30 | 万洲电气股份有限公司 | Graded frequency conversion stepless voltage regulating soft starting device based on non-speed sensor |
| US9350275B2 (en) | 2014-05-19 | 2016-05-24 | Rockwell Automation Technologies, Inc. | Quasi variable frequency motor controller |
| CN106026787A (en) * | 2016-07-11 | 2016-10-12 | 太原理工大学 | Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control |
| CN107632538A (en) * | 2017-10-13 | 2018-01-26 | 河北瑞程思科技有限公司 | A kind of more control adapters of fresh air |
-
2011
- 2011-07-28 CN CN2011202697426U patent/CN202172377U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904492A (en) * | 2011-07-28 | 2013-01-30 | 万洲电气股份有限公司 | Graded frequency conversion stepless voltage regulating soft starting device based on non-speed sensor |
| US9350275B2 (en) | 2014-05-19 | 2016-05-24 | Rockwell Automation Technologies, Inc. | Quasi variable frequency motor controller |
| US9685898B2 (en) | 2014-05-19 | 2017-06-20 | Rockwell Automation Technologies, Inc. | Quasi vector motor controller |
| CN106026787A (en) * | 2016-07-11 | 2016-10-12 | 太原理工大学 | Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control |
| CN107632538A (en) * | 2017-10-13 | 2018-01-26 | 河北瑞程思科技有限公司 | A kind of more control adapters of fresh air |
| CN107632538B (en) * | 2017-10-13 | 2021-01-05 | 河北瑞程思科技有限公司 | Multi-control adapter for fresh air |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WORLDWIDE ELECTRIC CO., LTD. Free format text: FORMER NAME: WORLDWIDE ELECTRIC GROUP CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 441000 No. 58 long march road, Hubei, Xiangfan Patentee after: Wanzhou Electrical Co., Ltd. Address before: 441000 No. 58 long march road, Hubei, Xiangfan Patentee before: Worldwide Electric Group Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20120321 |
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| CX01 | Expiry of patent term |