CN207638594U - A kind of solar cell sintered furnace governing system - Google Patents

Abstract

The utility model discloses a kind of solar cell sintered furnace governing systems,It is related to solar battery sheet agglomerating plant field,More particularly to a kind of solar battery sheet sintering furnace governing system,It is unstable for solving existing solar cell sintered furnace governing system rotating speed control,Equipment volume is huge,Working efficiency is low,Consume energy excessive problem,Including main circuit and control circuit,The main circuit includes rectification,Filtering and intelligent power module circuit,The control circuit includes feedback circuit,Dsp controller and protection circuit,The control circuit receives the feedback signal from motor,In dsp chip after operation,Inverter control signal is produced according to SVPWM principles,Control each switching tube work,It is finally reached and adjusts the purpose that stator voltage realizes speed governing,The utility model drives crawler belt using power electronic devices control ac three-phase asynchronous motor,Reduce device volume,It improves work efficiency,Control characteristic with stable ideal,Improve yields.

Description

A kind of solar cell sintered furnace governing system

Technical field

The use of the new type is related to solar battery sheet agglomerating plant field more particularly to a kind of solar battery sheet sintering furnace Governing system.

Background technology

After the 1970s, with the development of modern industry, global energy crisis and atmosphere polluting problem become increasingly conspicuous, Traditional fuel energy is reduced day by day, is endangered and is become increasingly conspicuous caused by environment, while there are about 2,000,000,000 people to obtain not in the whole world To normal energy supply, this when, sight has all been invested regenerative resource by the whole world, it is desirable to which regenerative resource can change The energy resource structure for becoming the mankind maintains long-range sustainable development, what solar energy was paid attention to its exclusive advantage and as people Focus, abundant solar radiation energy are important the energy, are inexhaustible, pollution-free, cheap, the mankind can The energy freely utilized, the energy that solar energy reaches ground each second is up to 800,000 kilowatt hours, just because of these of solar energy Unique advantage, after the 1980s, the scale of construction of photovoltaic generation constantly increases, application range is increasingly wide, market scale also by Step expands, and photovoltaic generation is being prepared mainly by the way of preparing solar battery sheet to carry out conversion of the luminous energy to electric energy When solar battery sheet, it is exactly that the electrode being printed onto on silicon chip is sintered at high temperature to need the process being sintered, sintering Cell piece finally makes electrode and silicon chip itself form Ohmic contact, to improve the open-circuit voltage and fill factor two of battery Crucial factor data makes the contact of electrode have resistance characteristic, achievees the purpose that the high transfer efficient cell piece of production.

Excellent sintering furnace equipment is the basis for ensureing solar battery sheet yields, if sintering furnace is carried out in process of production Often there is the phenomenon that uneven movement velocity or even stalling in band, then has a great impact to the whole production efficiency of production line.

Therefore designing a kind of can ensure solar cell sintered furnace crawler belt energy stable operation and the small burning of small size that consumes energy Freezing of a furnace governing system has realistic meaning very much.

Utility model content

The purpose of this utility model is that:In order to solve existing solar cell sintered furnace governing system fluctuation of service, The problem that efficiency is low while the big energy consumption of volume is big, the utility model provide a kind of solar cell sintered furnace governing system, make Ac three-phase asynchronous motor is controlled through power electronics variation device with SVPWM methods, there is stabilization of speed, effectively reduce equipment body The advantages of product improves operational efficiency, reduces energy consumption

The technical solution adopted in the utility model is as follows：

A kind of solar cell sintered furnace governing system, including main circuit and control circuit, the main circuit include rectification Circuit, filter circuit and power module IPM circuits, the control circuit include feedback circuit, dsp chip and protection circuit, institute It states feedback circuit and receives the rotating speed of motor and stator current feedback signal in sintering furnace, realize that D/A turns in dsp chip It changes, calculate the rotating speed of motor and generate six road IPM inverter control signals, six road IPM inverter control signals pass to power Module I PM circuits, in driving power module I PM circuits each switching tube work, each switching tube work adjust the voltage of stator, And then control motor speed.

Further, rectification circuit main function is to receive the three-phase alternating voltage from input terminal, is transformed into direct current It is sent into inverter circuit afterwards and powers to control circuit, the utility model rectification circuit is adopted as the uncontrollable rectification of full-bridge type diode The three-phase alternating voltage of input terminal is transformed into after direct current and is sent into inverter circuit and control circuit power supply by circuit.

Further, feedback circuit includes current sample filter circuit and photoelectric encoder, the current sample filtered electrical Road is exactly to detect DC bus current and asynchronous machine threephase stator electric current, and the current signal detected is converted into locate The voltage signal of reason, send to DSP and carries out processing analysis, and the use of the new type carries out current sample using Hall current sensor, makes Current filtering is carried out with electrolytic capacitor.

Further, photoelectric encoder is mounted on motor shaft, and threephase asynchronous machine rotating speed is detected using Measuring Frequency Method.

Further, inverter section selects intelligent power module, and intelligent power module circuit is by 6 IGBT groups At three phase inverter bridge, IGBT is voltage-controlled device, is easy to drive, and has self-switching-off capability, the high advantage of switching frequency.

Further, protection circuit includes current foldback circuit, and the current foldback circuit is usually incorporated in electric current inspection In slowdown monitoring circuit, on the one hand the current signal that current detection circuit detects is analyzed by processing feeding processor, another party Face connects current protecting circuit, is monitored in real time to size of current.

Further, dsp chip is completed to control using the motor series special control chip TMS320LF2407A of TI companies Processing work processed.

In conclusion by adopting the above-described technical solution, the utility model has the beneficial effects that：

1. the utility model uses threephase asynchronous machine frequency conversion speed-adjusting system, speed adjusting performance is excellent, and stability is best.

2. the utility model main circuit uses Technics of Power Electronic Conversion device, reduce number of devices, reduces device volume, carry High power and efficiency.

3. the motor control strategy of the utility model uses space voltage vector modulation (SVPWM), inversion can be obviously reduced Device output current harmonics ingredient, voltage utilization is high, and control is simple, and digitlization is convenient.

4. the utility model switching tube uses insulated gate bipolar transistor (IGBT), switching frequency is high, efficient, simultaneously Noiseless driving can be achieved.

5. the utility model using dsp chip to system carry out control process, dsp chip have precision it is high, it is cost-effective, The advantage that small, small power consumption, real-time processing speed are fast while processing data amount is big.

Description of the drawings

The utility model will illustrate by example and with reference to the appended drawing, in the accompanying drawings：

Fig. 1 is Tthe utility model system structure diagram；

Fig. 2 is the utility model governing system main circuit diagram；

Fig. 3 is the utility model current sampling circuit figure；

Specific implementation mode

It is new to this practicality with reference to the accompanying drawings and examples in order to which those skilled in the art are better understood from utility model Type is described in detail.

Embodiment：A kind of solar cell sintered furnace governing system, including main circuit and control circuit, the main circuit is such as Shown in Fig. 2, including rectification circuit, filter circuit and intelligent power module circuit, three-phase alternating current enter rectification circuit it Before, it first passes through by the absorbing circuit of R, C in combination, prevents transformer inrush voltage and overvoltage, three intersections after absorbing circuit Galvanic electricity enters the rectification circuit being made of full-bridge diode and filter capacitor C1, C2, C3, C4, and three-phase alternating current is transformed to directly Galvanic electricity is input in IPM inverters, and inverter bridge forms three phase inverter bridge by 6 IGBT (VT1-VT6) in IPM, after inversion Three-phase alternating current input threephase asynchronous machine is controlled.

The control circuit includes feedback circuit, dsp controller and protection circuit, and the feedback circuit receives to come from motor Rotating speed and stator current feedback signal, realize in dsp chip D/A switch, computer rotating speed and vector control algorithm Operation generates six road IPM inverter control signals further according to SVPWM principles, and each switching tube work of drive control inverter is adjusted Stator voltage is saved, motor speed is controlled.

Preferably, rectification circuit main function is to receive the three-phase alternating voltage from input terminal, after being transformed into direct current It is sent into inverter circuit and powers to control circuit, the utility model rectification circuit is adopted as the uncontrollable rectified current of full-bridge type diode The three-phase alternating voltage of input terminal is transformed into after direct current and is sent into inverter circuit and control circuit is powered by road, when steady operation, It is similar to square wave by the diode current waveform of three-phase commutation bridge, the current effective value for flowing through rectifier diode is：

Preferably, feedback circuit includes current sample filter circuit and photoelectric encoder, the current sample filter circuit As shown in figure 3, Hall alternating current output signal is converted to voltage signal after load resistance R, by current signal, filtered by R2, C Wave link, with biasing given voltage V_refIt is overlapped, is input in dsp chip after amplifier, D1, D2 constitute amplitude limit electricity Road ensures the range of signal in input dsp chip between 0-3.3V, the circuit course of work：Detect DC bus current and Asynchronous machine threephase stator electric current, and the voltage signal that the current signal detected is converted into handle send to DSP and carry out Processing analysis, the use of the new type carry out current sample using Hall current sensor, and current filtering, light are carried out using electrolytic capacitor Photoelectric coder is mounted on motor shaft, and threephase asynchronous machine rotating speed is detected using Measuring Frequency Method.

Measuring Frequency Method (M methods)：In certain time interval T, to the pulse M count of rotary encoder output, mean speed is obtained, if The pulse number of photoelectric encoder output in one week is p, then rotating speed is：

Preferably, inverter section selects intelligent power module, intelligent power module circuit to be made of 6 IGBT Three phase inverter bridge, IGBT are voltage-controlled devices, are easy to drive, and have self-switching-off capability, the high advantage of switching frequency, rotation When IGBT, the peak value of load current is considered, be empirically derived the collector current by IGBT：

Preferably, protection circuit is current foldback circuit, and the current foldback circuit is usually incorporated in current detecting electricity On the one hand Lu Zhong, the current signal that current detection circuit detects are sent into processor by processing and are analyzed, on the other hand connected Current protecting circuit is connect, size of current is monitored in real time.

Preferably, dsp chip completes control using the motor series special control chip TMS320LF2407A of TI companies Processing work.

The above is only preferred embodiments of the present invention, it is noted that for the ordinary skill people of this field For member, without departing from the concept of the premise utility, several modifications and improvements can also be made, these belong to practicality Novel protection domain.

Claims (8)

1. a kind of solar cell sintered furnace governing system, including main circuit and control circuit, which is characterized in that the main circuit Including rectification circuit, filter circuit and power module IPM circuits, the control circuit includes feedback circuit, dsp chip and protection Circuit, the feedback circuit receive the rotating speed of motor and stator current feedback signal in sintering furnace, are realized in dsp chip D/A switch, the rotating speed for calculating motor simultaneously generate six road IPM inverter control signals, and six road IPM inverter control signals transmit Give power module IPM circuits, each switching tube work in driving power module I PM circuits, each switching tube work adjusts stator Voltage, and then control motor speed.

2. a kind of solar cell sintered furnace governing system according to claim 1, which is characterized in that the rectification circuit For full-bridge type diode can not control rectifying circuit, be sent into inverter circuit after the three-phase alternating voltage of input terminal is transformed into direct current It powers with control circuit.

3. a kind of solar cell sintered furnace governing system according to claim 1, which is characterized in that the feedback circuit Including current sample filter circuit and photoelectric encoder.

4. a kind of solar cell sintered furnace governing system according to claim 3, which is characterized in that the current sample Filter circuit carries out current sample using Hall current sensor, and current filtering is carried out using electrolytic capacitor.

5. a kind of solar cell sintered furnace governing system according to claim 3, which is characterized in that the photoelectric coding Device is mounted on motor shaft, and threephase asynchronous machine rotating speed is detected using Measuring Frequency Method.

6. a kind of solar cell sintered furnace governing system according to claim 1, which is characterized in that the power module IPM circuits form three phase inverter bridge by 6 IGBT.

7. a kind of solar cell sintered furnace governing system according to claim 1, which is characterized in that the protection circuit For current foldback circuit.

8. a kind of solar cell sintered furnace governing system according to claim 1, which is characterized in that the dsp chip Using TMS320LF2407A.