CN203911836U - Blower fan frequency conversion speed regulation system with double PWM control - Google Patents
Blower fan frequency conversion speed regulation system with double PWM control Download PDFInfo
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- CN203911836U CN203911836U CN201420312529.2U CN201420312529U CN203911836U CN 203911836 U CN203911836 U CN 203911836U CN 201420312529 U CN201420312529 U CN 201420312529U CN 203911836 U CN203911836 U CN 203911836U
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Abstract
本实用新型公开了一种采用双PWM控制的风机变频调速系统。该系统采用单片机为控制核心构成SPWM控制电路，变频主电路采用交-直-交三相电压源型变频器结构，使用双PWM控制。PWM整流部分采用滞环电流比较的直接电流控制方法，利用MC1496提高功率因数，逆变器部分采用基于SA4828的控制电路产生SPWM波，控制6个IGBT的通断，实现对异步电动机的VVVF调速。本系统能够解决风机、水泵类负载在应用中多数时间处于欠载状态，运转效率低的问题，能有效提高功率因数，达到节能的目的。
The utility model discloses a fan frequency conversion speed regulation system controlled by double PWM. The system uses a single-chip microcomputer as the control core to form a SPWM control circuit, and the frequency conversion main circuit adopts an AC-DC-AC three-phase voltage source inverter structure, and uses dual PWM control. The PWM rectification part adopts the direct current control method of hysteresis current comparison, and uses MC1496 to improve the power factor. The inverter part uses the control circuit based on SA4828 to generate SPWM waves, and controls the on-off of 6 IGBTs to realize the VVVF speed regulation of the asynchronous motor. . This system can solve the problem that the fans and pumps are under-loaded most of the time in the application, and the operation efficiency is low, and it can effectively improve the power factor and achieve the purpose of energy saving.
Description
Technical field
The utility model relates to energy Saving governing system, relates in particular to the dual PWM controlled fan frequency conversion governing system of a kind of employing.
Background technology
The frequency control of asynchronous machine has great importance in the application in Electric Traction field.The electricity charge consumption of factories and miness approximately 70% is in blower fan, pump class even load, and its running efficiency on average only has 20%～50%.Therefore the running efficiency that, improves this type of load is imperative.
Three-phase AC asynchronous motor is simple in structure, firm, is easy to safeguard, since the invention eighties in 19th century, has just been widely used.Yet aspect speed governing, it is the state in " retarded child " for a long time.Along with the develop rapidly of modern electronic technology, frequency converter is widely used in every field, and its advantage mainly contains: 1. raise the efficiency; 2. reduce weight and the volume of product; 3. realize soft start; 4. saves energy.
Most time is in underload state in actual applications for blower fan, and running efficiency is low.In view of directly the speed governing of alternating current machine being difficult to realize, utilize traditionally deep bead or open/shuts down to regulate air quantity, but when machine operation is under power frequency state greatly, frequently hold/shutdown can cause very large electric power impact, causes the loss of electric energy.Therefore, utilize Frequency Converter Control blower fan, by the frequency control to blower fan, improving operational efficiency is the method for comparison science, when motor moves with 80% of rated speed, and (80%) that the power of its consumption is rated power in theory
3, because going out power, the speed of rotating shaft is directly proportional to rotating speed 3 powers, also can realize closed loop constant voltage simultaneously and control further raising of energy-saving efficiency.
It is the control core of Alternating Current Governor System that PWM controls, and the final realization of any control algolithm nearly all completes with various PWM control modes.At present proposed and obtained just not lower tens kinds of the PWM control programs of practical application, about the article of PWM control technology, in a lot of famous power electronics international conferences, as PESC, IECON, has formed special topic in EPE meeting.Especially microprocessor applications is in PWM technology and after making it digitlization, and style is to constantly update, and from the sine of initial pursuit voltage waveform, arrives the sine of current waveform, then arrives the sine of magnetic flux; From efficiency optimization, torque pulsation is minimum, then to abating the noise etc., the development experience of PWM control technology one constantly bring forth new ideas and continuous perfect process.Up to the present, also have new scheme constantly to propose, further prove that the research of this technology is in the ascendant.
Summary of the invention
The utility model is intended to design a kind of based on dual PWM controlled Fan Energy-saving frequency conversion speed-adjusting system.The AT89C51 that adopts Intel Company is that core controller forms SPWM control circuit, three phase converter circuit adopts AC-DC-AC voltage-source type frequency changer, mainly by controlled rectification link, filtering link, inversion link, detection and control loop, formed, three-phase alternating current is through controlled rectification circuit, rectification output is through the large capacitor filtering of intermediate link, obtain the very little direct voltage of mains ripple, Converting Unit, by the turn-on and turn-off of power device, is exported 6 ladder waves ACs.In main circuit, rectification and inversion all adopt full control device IGBT, adopt two PWM to control, and PWM rectification can make power factor close to 1, can make energy feed back to electrical network simultaneously.
The utility model relates to the dual PWM controlled fan frequency conversion governing system of a kind of employing, it is characterized in that, contains: frequency conversion main circuit, and the Direct Current Control of hysteresis current comparison and controller AT89C51 tri-parts, wherein,
Frequency conversion main circuit: electrical network side joint collector ring joint 1,1 connects filtering link 2,2 and connects inversion link 3,3 and meet motor 3～M;
The Direct Current Control part of hysteresis current comparison: this part is respectively by synchronous circuit and i
a, i
bsample circuit connects grid side, is connected with filtering link 2 simultaneously, is connected with optical coupling isolation circuit;
Controller AT89C51 utilizes SA4828 to produce control signal, by optical coupling isolation circuit, is sent respectively rectification link 1 and is connect inversion link 3, receives the information of fault diagnosis circuit, by communication interface, connects keyboard and demonstration.
Accompanying drawing explanation
Fig. 1 adopts dual PWM controlled fan frequency conversion governing system figure.
Fig. 2 is Direct Current Control system construction drawing.
Fig. 3 is the control system based on SA4828
Embodiment
As shown in Figure 1, it is that control core forms SPWM control circuit that this system adopts single-chip microcomputer to the frequency conversion speed-adjusting system of the utility model institute foundation, and frequency conversion main circuit adopts AC-DC-AC three-phase voltage source type frequency changer, uses two PWM to control.PWM rectifying part adopts the Direct Current Control method of hysteresis current comparison, utilize MC1496 to improve power factor, inverter section adopts the control circuit based on SA4828 to produce SPWM ripple, controls the break-make of 6 IGBT, realizes the VVVF speed governing to asynchronous motor.
To rectifying part, adopt PWM to control, utilize a kind of the most frequently used employing Hysteresis Current manner of comparison shown in Fig. 2 to realize Direct Current Control.This control system adopts two closed-loop controls, and its outer shroud is DC voltage control ring, and interior ring is AC current control ring.Outer shroud pi regulator is output as DC current signal i
d, i
dbe multiplied by respectively and a, b, the synchronous sinusoidal signal of c three-phase phase voltage, must fall the sinusoidal command signal of three-phase alternating current
obviously,
supply voltage same-phase respectively and separately, the direct current signal i of its amplitude and reflected load size of current
dbe directly proportional.This command signal and actual ac current signal relatively after, by stagnant ring, each switching device is controlled, just can make actual interchange input current trace command value, in the scope that its tracking error determines in stagnant ring ring width.
Fig. 3 is the control system based on SA4828, first by keyboard, inputs given rotation speed n
0(r/min), single-chip microcomputer is converted into frequency that frequency converter will export and the control word of voltage it, is written to the control register of SA4828, starts SA4828.From 6 pins of RT～BB, export the SPWM control signal of corresponding frequencies and voltage, after drive circuit isolation, control respectively conducting and the shutoff of 6 IGBT of intelligent power module, finally on three outputs, produce symmetrical Three-phase SPWM voltage, to drive alternating current motor running, realize the frequency control to motor.
Adopt open loop U/F, the control mode of low-frequency voltage compensation.The fault detection signal of IPM is received the SET TRIP end of SA4828, once overcurrent, overheated, short circuit and the situation such as under-voltage occur IPM, will cut off immediately the 6 tunnel output signals of SA4828, and IPM is protected.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312529.2U CN203911836U (en) | 2014-06-12 | 2014-06-12 | Blower fan frequency conversion speed regulation system with double PWM control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420312529.2U CN203911836U (en) | 2014-06-12 | 2014-06-12 | Blower fan frequency conversion speed regulation system with double PWM control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356820A (en) * | 2015-12-08 | 2016-02-24 | 武汉大禹电气有限公司 | Middle and high voltage frequency conversion speed regulation double CPU control system and control method thereof |
| CN106953360A (en) * | 2017-04-25 | 2017-07-14 | 石狮市酷瑞电气有限责任公司 | A kind of powered recoverable frequency converter |
| CN110350845A (en) * | 2019-07-04 | 2019-10-18 | 冶金自动化研究设计院 | A kind of frequency converter control method based on profinet communication |
| CN112815370A (en) * | 2021-01-18 | 2021-05-18 | 青岛海尔智慧厨房电器有限公司 | Air volume control system of range hood, device and method thereof |
-
2014
- 2014-06-12 CN CN201420312529.2U patent/CN203911836U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356820A (en) * | 2015-12-08 | 2016-02-24 | 武汉大禹电气有限公司 | Middle and high voltage frequency conversion speed regulation double CPU control system and control method thereof |
| CN106953360A (en) * | 2017-04-25 | 2017-07-14 | 石狮市酷瑞电气有限责任公司 | A kind of powered recoverable frequency converter |
| CN110350845A (en) * | 2019-07-04 | 2019-10-18 | 冶金自动化研究设计院 | A kind of frequency converter control method based on profinet communication |
| CN112815370A (en) * | 2021-01-18 | 2021-05-18 | 青岛海尔智慧厨房电器有限公司 | Air volume control system of range hood, device and method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20150612 |
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| EXPY | Termination of patent right or utility model |