CN107093976A - General frequency conversion speed-adjusting system based on DSP - Google Patents
General frequency conversion speed-adjusting system based on DSP Download PDFInfo
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- CN107093976A CN107093976A CN201710524714.6A CN201710524714A CN107093976A CN 107093976 A CN107093976 A CN 107093976A CN 201710524714 A CN201710524714 A CN 201710524714A CN 107093976 A CN107093976 A CN 107093976A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
General frequency conversion speed-adjusting system based on DSP, including main circuit, control circuit, protection circuit.Main circuit is made up of three-phase uncontrollable rectifier link, filtering link, the part of inversion link three.The DC voltage of rectifier bridge output is not steady enough, and with harmonic wave, to filter out the Resonance Wave Composition in DC voltage so that busbar voltage is more steady, C3 is connected in parallel with a capacitor at dc bus two ends.And after filtering after DC bus-bar voltage can pass through the controllable inverter bridge of three-phase again, obtain required three-phase alternating current, motor M is run as desired.General frequency conversion speed-adjusting system of the invention based on DSP, can both realize the big torque starting of asynchronous motor, and can realize the frequency control of wide scope to asynchronous motor again, and be the optimal method of operation of current asynchronous motor.Relative to asynchronous motor direct full pressure start-up and low pressure soft-starting method, with obvious technical advantage.
Description
Technical field
A kind of general frequency conversion speed-adjusting system based on DSP of the present invention, is related to digitlization converter technology field.
Background technology
The development of digitlization frequency converter is the product of World Economics high speed development.Its develop trend approximately as：
1st, low electromagnetic noise, mute：Universal frequency converter adds AC reactor or APFC in input side
Circuit APFC, and Soft-PWM control technologies etc. are taken in inverter circuit, it is humorous to improve input current waveform, reduction power network
Ripple, meets EMC international standards in terms of anti-interference and suppress higher hamonic wave, realizes the conversion of so-called cleaning electric energy.Such as Mitsubishi
The flexible PWM control technologies of company, realize the operation of more low noise.
2nd, customizations：Frequency converter is digitized preferably to play the unique function of Frequency Conversion and Speed Regulation Technique, and as far as possible
The need for meeting field control, many special-purpose models such as blower fan water pump air-conditioning tailored version, crane tailored version, constant pressure are derived from and have supplied
Water tailored version, alternating-current electrical lift tailored version, textile machine tailored version, mechanical main shaft transmission tailored version, power supply regenerative tailored version, intermediate frequency
Drive tailored version, locomotive traction tailored version, single-phase frequency converter etc..
3rd, systematization：Digitlization frequency converter is in addition to development the digitizing of unit, intelligent, multifunction, also to integrated
Change, systematization direction is developed.Integrate the " fully integrated of communication, design and data management three as what Siemens Company proposed
Automation " (TIA) platform concept, can make the integrated configurations such as frequency converter, servomechanism installation, controller and communication device, or even certainly
Dynamicization and drive system, Communication and Data Management System can be typically embedded into as drive device " Integrated automation " system that
Sample is carried out, it is therefore an objective to provide the user optimal systemic-function.
4th, networking：Digitlization frequency converter can provide a variety of compatible communication interfaces, support a variety of different communication protocols,
Built-in RS485 interfaces, can pass through choosing from personal computer to universal frequency converter input operation order and set-up function code data etc.
Part can be with fieldbus：Profibus-DP、Interbus-S、Device Net、Modbus Plus、CC-Link、
LONWORKS, Ethernet, CAN Open, T-LINK etc. are communicated.Such as Siemens, VACON, Fuji, Hitachi, Mitsubishi, platform peace
The universal frequency converter of brand, can support above-mentioned several or all types fieldbus by each available option.
5th, operate fool：" the debugging guide " of solidification can guide you to insert tune length by length in digitlization frequency converter machine
Take temperature lattice, without remembeing any parameter, fully demonstrated ease for operation.Such as a new generation of Siemens Company
MICROMASTER420/440 is because employing a kind of successful concept for being referred to as " easy to use " so that interconnection technique, install and
Operation in terms of debugging becomes very simple.
6th, parameter trend figure：The parameter trend figure of digitlization frequency converter can in time show the current operation shape of each signal
State, user can monitor and record at any time operational factor in debugging process.Such as a new generation of Siemens Company
MICROMASTER420/440 higher level operation plate AOP, the parameter of frequency converter can go up dress or lower dress, pass through the USS of fieldbus
Up to 31 frequency converter driving devices of connection debugging and control.AOP can store 10 groups of data.It is stored in each group number in AOP
Load according to other MICROMASTER420/440 can be directly loadable into, or by USS.
7th, built-in application software：Digitize frequency converter can built-in a variety of application software, some brands can provide up to
More than 130 application software planted, the need for meeting field process control, such as：PID control software, tension force software, velocity stage
Chain, speed follower, current balance type, frequency converter function setting software, bitcom etc..Frequency converter function setting software can be
The function and data communication of frequency converter are set under WINDOWS95/98 environment.
8th, parameters self-tuning：As long as user's setting data group coding, without setting item by item, universal frequency converter will can be run
Parameter is automatically adjusted to optimum state (vector type frequency converter can carry out Self-tuning System to the parameter of electric machine).
With the raising that the progress and people of commercial production levels are required quality of life, AC variable-frequency speed regulation system is
Become a part indispensable in mankind's daily life and Industry Control.Universal frequency converter escalator, cable machinery,
The extensive use in the fields such as dyeing apparatus, chemical machinery, plastics machinery, oil field equipment, mine mechanism meets the mankind couple
While speed governing product demand, also the governing system to a new generation proposes higher requirement.These requirements are mainly reflected in
Two aspects of performance and multipurpose of control system.
The content of the invention
The present invention provides a kind of general frequency conversion speed-adjusting system based on DSP, can both realize the big torque of asynchronous motor
Start, the frequency control of wide scope can be realized to asynchronous motor again.Possess the demand that can be met all kinds of heavy dutys and start, section
Can consumption reduction, the advantage of remarkable in economical benefits.
The technical scheme that the present invention takes is：
General frequency conversion speed-adjusting system based on DSP, including main circuit, control circuit, protection circuit, the main circuit include
Three phase rectifier bridge module, median filter module, inverter circuit module, three phase rectifier bridge module connection median filter module are middle
Filtration module connects inverter circuit module, inverter circuit module connection motor M.
Noninductive Absorption Capacitance C3 is connected between the median filter module and inverter circuit module.
The three phase rectifier bridge module includes three-phase uncontrollable rectifier circuit, for the rectification to three-phase mains, is pulsed
DC voltage；
The median filter module, for removing Resonance Wave Composition, makes bus voltage value steady；
The noninductive Absorption Capacitance C3, for absorbing high frequency spikes voltage, electric current；
The inverter circuit module, for the break-make by controlling IGBT, exports alternating impulse voltage；
It is described control circuit include DSP module, DSP module connect respectively DSP minimum systems, PWM level shifting circuits,
SCI serial communication circuits, CAN communicating circuit, tach signal process circuit, input circuit, output circuit；
The DSP minimum systems are downloaded mouth, filter circuit and constituted by external crystal-controlled oscillation, power supply, JTAG；
The PWM level shifting circuits include electrical level transferring chip 74LVX4245, and DSP module passes through PWM level conversions electricity
Road connection optocoupler TLP559, PWM level shifting circuit is used to 3.3V going to 5V；
The tach signal process circuit includes optocoupler 6N137, signal processing unit, and photoelectric encoder passes through signal transacting
Unit connection optocoupler 6N137；The signal that photoelectric encoder is sent is obtained after signal processing unit and optocoupler 6N137 isolation
Encoder_A, Encoder_B two-way orthogonal pulses signal, then two paths of signals is inputted to EQEPA, EQEPB of DSP module respectively
Mouth carries out step-by-step counting to calculate tachometer value.
The input circuit includes optocoupler TLP521, LED, LED connection optocoupler TLP521
Input side, optocoupler TLP521 outlet sides connection DSP module；
The output circuit includes:Phase inverter TC74HC07AF, optocoupler TLP521, the Darlington crystal of high-voltage large current eight
Pipe display ULN2804, relay；Phase inverter TC74HC07AF connection optocoupler TLP521 input sides, optocoupler TLP521 outlet sides connect
Meet the Darlington transistor of high-voltage large current eight display ULN2804, the Darlington transistor of high-voltage large current eight display ULN2804
Connect relay；
The protection circuit includes：The first current sensor for detecting U phase currents；For detecting V phase currents
One current sensor；The 3rd current sensor for detecting DC bus current；Electricity for detecting d-c bus voltage value
Pressure sensor.
First, second and third current sensor connects DSP module by current signal conditioning circuit；First, second and third electricity
Flow sensor obtains current signal, the A/D thief hatch for being then fed into DSP module is handled via signal conditioning circuit, for realizing
Current protection；
The voltage sensor connects DSP module by voltage signal conditioning circuit；
The voltage signal conditioning circuit includes sampling resistor R206-1, R206-2, sampling resistor R206-1, R206-2 two
The obtained voltage signal in end is 5V, after RC filtering and voltage follow, is divided into two-way：It is used to hardware over-voltage all the way protect, i.e.,
Output overvoltage signal TZ_U is sent directly into the TZ mouths of DSP module after being compared with a fixed level 5V；Partial pressure is then passed through on another road
The signal for obtaining 0-3V afterwards sends into the A/D thief hatch of DSP module.
The noninductive Absorption Capacitance C3 is 1 μ F/1200VDC noninductive Absorption Capacitance.
The three phase rectifier bridge module is MDS50A/1600V three phase rectifier bridge modules, and its major parameter is：It is pressure-resistant
1600V, rated current 50A.
The inverter circuit module is 7 unit IPM module 7MBP75RA120 of company of Fuji, and it has been internally integrated 7
IGBT, drive circuit, protection module and braking circuit.1200V voltage can be born, can be 75A by current maxima,
It is sufficient for design requirement.
The failure output ALM terminals of external one of the inverter circuit module, can be blocked in failure by microprocessor
PWM is exported, and is played a protective role.
The median filter module is in series by two 2200 μ F/400V electric capacity C1, C2, has both met to filtered electrical
The technical need of appearance, while the price and volume of electric capacity can also receive.
The control circuit also includes D.C. regulated power supply, U, V phases line voltage of main circuit as power circuit input,
Using being exported after linear transformer reduction voltage class, the alternating current of the low-voltage-grade of output is uncontrollable whole by full-bridge again
Required DC voltage is obtained after stream, the voltage stabilizing of three-terminal voltage-stabilizing chip, capacitor filtering.
The SCI serial communication circuits include MAX485 chips, optocoupler HCPL-M611, build-out resistor, the MAX485 cores
Piece, optocoupler HCPL-M611, build-out resistor are all connected with DSP module.
The CAN communicating circuit includes CAN communication module CTM1050T, CAN communication module
CTM1050T connection DSP modules.
The protection circuit includes analog comparator, judges whether current value has exceeded setting value, so as to directly give
Over-current signal, the resultant fault alarm signal A LM terminals of the signal and inverter circuit module make " line or ".
First, second and third current sensor is LA-50P current sensors.
The DSP module is TMS320F2808 processors.
The DSP module adds " permission retarder location ", when this set, and system could effective brake.
A kind of general frequency conversion speed-adjusting system based on DSP of the present invention, can both realize the big torque starting of asynchronous motor,
The frequency control of wide scope can be realized to asynchronous motor again, is the optimal method of operation of current asynchronous motor.Relative to
Asynchronous motor direct full pressure start-up and low pressure soft-starting method, with obvious technical advantage.
Brief description of the drawings
Fig. 1 is system block diagram of the invention.
Fig. 2 is main circuit of converter figure of the invention.
Fig. 3 is digitlization transducer control circuit schematic diagram of the invention.
Fig. 4 is DSP minimum system circuit diagrams of the invention.
Fig. 5 is PWM level shifting circuit figures of the invention.
Fig. 6 is SCI serial communication circuit figures of the invention.
Fig. 7 is CAN communicating circuit figure of the invention.
Fig. 8 is tach signal process circuit figure of the invention.
Fig. 9 is input circuit figure of the invention.
Figure 10 is output circuit figure of the invention.
Figure 11 is DC-stabilized circuit figure of the invention.
Figure 12 digitizes the U phase current sampling signal conditioning circuits of frequency converter for the present invention.
Figure 13 digitizes the V phase current sampling signal conditioning circuits of frequency converter for the present invention.
Figure 14 digitizes the DC bus current sampled signal modulate circuit of frequency converter for the present invention.
Figure 15 digitizes the current foldback circuit of frequency converter for the present invention.
Figure 16 digitizes overvoltage, under-voltage protection and the brake control circuit figure of frequency converter for the present invention.
Embodiment
As shown in figure 1, the general frequency conversion speed-adjusting system based on DSP, including main circuit, control circuit, protection circuit.Main electricity
It route three-phase uncontrollable rectifier link, filtering link, the part of inversion link three composition.The DC voltage that rectifier bridge is exported in Fig. 1 is not
It is enough steady, with harmonic wave, to filter out the Resonance Wave Composition in DC voltage so that busbar voltage is more steady, in dc bus two
End is connected in parallel with a capacitor C3.And after filtering after DC bus-bar voltage can pass through the controllable inverter bridge of three-phase again, obtain needed for
The three-phase alternating current wanted, motor M is run as desired.
Circuit is controlled using TMS320F2808 as control core, its peripheral circuit includes EEPROM expanded circuit, sampling letter
Number process circuit, DAC7512 expanded circuit, the process circuit of rotating speed coder input signal, imput output circuit and logical
Interrogate circuit；Instruction and the value of measurement input that DSP gives according to host computer, are handled and computing, then pass through in chip internal
EPWM modules export PWM ripples.DSP exports the simulation that 0~3.3V is converted into D/A conversion chips DAC7512 by 3 I/O mouthfuls
Amount output, the change of intermediate quantity is observed with this；By 2 I/O mouthfuls, a control start and stop, also one controlled motor M is positive and negative
Turn.
Protection circuit includes soft charge circuit, overvoltage crowbar, current foldback circuit, under-voltage protecting circuit figure, mistake
Thermal protection circuit, IPM ALM protection circuits and brake control circuit.R in Fig. 10, can when upper electric for soft charge resistance
To play a part of current limliting, the impact to electric capacity of uprushing of upper electric moment electric current is avoided with this, and K is A.C. contactor, is used
In control resistance R0Access, when electric capacity completion charging after, i.e., by R0It is shorted out, to avoid resistance loss during normal work.
Overvoltage, under-voltage protection and overcurrent protection be to detect respective physical amount by voltage and current sensor, will measure and treats
Logic judgment is carried out in signal feeding DSP, corresponding defencive function is realized with this.Except the software protection function of being said here
Outside, system have also been devised hardware protection, and the TZ mouths that protection signal is sent directly into DSP are obtained by analog comparator, if hair
The then block PWM outputs immediately, and host computer is informed by serial communication of raw failure.IPM ALM alarm signals are also to be sent directly into
DSP TZ mouths, so there are the just directly block PWM outputs of IPM resultant faults.Pump ceiling system in figure is exactly to be used for braking
Control, here Yi Dan detecting magnitude of voltage when direct current bus bar pressure has exceeded electric operation, illustrate now motor
In on-position, at this moment the direction flowing of energy forward direction power network needs to control VTbConducting, so as to allow energy expenditure in braking electricity
In resistance.
As shown in Fig. 2 main circuit includes three phase rectifier bridge module, median filter module, inverter circuit module, three phase rectifier
Bridge module connects median filter module, median filter module connection inverter circuit module.Pass through the completion pair of three phase rectifier bridge module
The rectification of three-phase mains, to obtain the DC voltage of pulsation.Then the filtering Jing Guo median filter module, removes Resonance Wave Composition,
Make bus voltage value more steady.1 μ F/1200VDC noninductive Absorption Capacitance C3 is also added into the main circuit to be used to absorb
High frequency spikes voltage, electric current.Inverter circuit module is by controlling IGBT break-make, the alternating impulse voltage required for output.
One：The design of three phase rectifier bridge module：
The input of frequency converter is civil power：Three-phase 380V alternating currents, frequency 50Hz.Frequency inverter capacity is then according to the asynchronous of 20KW
Motor is designed.According to document " Chen Jian power electronics [M] Beijing:Higher Education Publishing House, the 2004 " formula provided,
Now DC bus-bar voltage average value, which can be calculated, is：
When unloaded：
Load and electric current consecutive hours：
The floating of supply voltage ± 5% is taken into account, then UPNmax=566V, UPNmin=489V；When loading as motor,
Its power factor (PF) is usually 0.78~0.9, and bus current maximum is thus obtained finally：
So, it is I by the average current maximum of each diode in three phase rectifier bridge moduledmax/ 3=17.5A；Examine
Consider the floating of supply voltage, then the maximum voltage about 980V that each diode is born.
In view of the cost performance and engineering allowance from component, the present invention has selected MDS50A/1600V three phase rectifiers
Bridge module, its major parameter is：Pressure-resistant 1600V, rated current 50A.
Two：The design of median filter module：
The voltage exported through the rectification of three phase rectifier bridge module is pulsation, and if not processed to it, being can not
The input of inverter circuit module is directly used in, addition electric capacity is accomplished by here and is filtered.In theory, filtering capacitance obtains big
A bit, filter effect will be quite a lot of.It is thus inconvenient in experimental prototype but the volume of large bulk capacitance is general also than larger
Placement；And the price of large bulk capacitance is more expensive than low capacity, from businessman, cost-effective angle considers.Filter capacitor is not yet
It can obtain too big.Consider above mentioned problem, the present invention has selected two 2200 μ F/400V electric capacity C1, C2 series connection, both met
To the technical need of filter capacitor, while the price and volume of electric capacity can also receive.
Three：The design of inverter circuit module：
Drive circuit and IGBT are packaged together by inverter circuit module, come with the defencive functions such as excessively stream, overheat, internal
Using the device of high-speed low-power-consumption, there is very strong self-protection function.It goes back the failure output ALM terminals of one, band, can be in event
PWM outputs are blocked by microprocessor during barrier, played a protective role, while it is also very well in the processing that power tube radiates.
The release of SPM, simplifies the process of inverter design, improves the success rate of a secondary design, a large amount of at present
Using.In the design of the inverter circuit module of the present invention, 7 unit IPM module 7MBP75RA120 of company of Fuji are employed,
It has been internally integrated 7 IGBT, drive circuit, protection module and braking circuit.1200V voltage can be born, can be led to
Overcurrent maximum is 75A, it is sufficient to meet design requirement.
As shown in figure 3, control circuit includes DSP module, DSP module connects DSP minimum systems, PWM level conversions respectively
Circuit, SCI serial communication circuits, CAN communicating circuit, tach signal process circuit, input circuit, output circuit.
DSP module：The control core chip that the present invention is used is the digital signal controller TMS320F2808 of TI companies.
The chip completes all control algolithms, speed sampling and calculating, exports SVPWM ripples, and current sample, voltage sample and
The functions such as excessively stream, overvoltage, under-voltage protection.TMS320F2808 is compared with the dsp chips such as conventional TMS320F2812, with following
Feature：
①：Moderate cost, cost performance is high；
②：100MHZ working frequency, meets the demand for control of most of power electronic equipments；
③：C language programming is supported, programming is convenient, and code efficiency is high；
④：There are many enhanced functional modules, facilitate the realization write with function of program；
⑤：A/D sampling precisions height (12).
As shown in figure 4, DSP minimum systems download mouth and some filter circuit groups by external crystal-controlled oscillation, power supply, JTAG
Into.External crystal-controlled oscillation selects active 20MHz crystal oscillators, and its supply voltage is 3.3V.For TMS320F2808 chips, it is required
I/O voltages are 3.3V, and core voltage is 1.8V.Design for convenience, the power supply chip for having selected TI companies supporting here
TPS767D318, the input 5V DC voltages of chip after chip is handled, export 3.3V and 1.8V two-way DC voltages.It is right
In entirely control circuit, digital voltage isolate with analog voltage using magnetic bead, simulate with digitally isolating, and selection properly
Electric capacity processing is filtered to each road power supply.The X5043 chips used in other the system, its supply voltage is 3.3V,
With supply voltage supervision and EEPROM functions, when supply voltage is less than 3.3V, the chip can produce reset signal and be to allow
System resets, while can be with storage unit point control parameter as EEPROM.
It is illustrated in figure 5 PWM level shifting circuits.The high speed photo coupling TLP559 of selection signal input part, is according to 5V
Voltage design, and the PWM WAVE VOLTAGE AMPLITUDE VALUESs of DSP module output are 3.3V, so need to use electrical level transferring chip
74LVX4245 realizes level conversion.The chip can be by changing the side of voltage conversion to the configuration of DIR pin level
To, be that 3.3V is gone into 5V here, by B mouthfuls turn to A mouthful export, so according to chip data, it is known that DIR needs to connect low electricity
It is flat.
SCI serial communication circuits are illustrated in figure 6, present invention employs the host computer based on dsPIC30F4011 and frequency conversion
Device host communication, parameter and instruction, and the purpose of readable frequency converter current state are issued to realize from host computer toward frequency converter.It is logical
The hardware components of news use and follow Modbus_RTU agreements on MAX485 chips, software.In order to avoid the interference introduced by communication,
Need to be isolated in DSP sides addition HCPL-M611 optocouplers.In order to suppress the echo interference in communication, build-out resistor is added.
CAN communicating circuit is illustrated in figure 7, for the ease of the extension in later stage, it is total that the present invention has also reserved a CAN
Line communication interface, hardware circuit is realized using CAN communication module CTM1050T.
Tach signal process circuit is illustrated in figure 8, because the signal mostly differential signal that photoelectric encoder is sent,
Need just obtain Encoder_A, Encoder_B two-way orthogonal pulses signal after signal transacting and light-coupled isolation, then will
EQEPA, EQEPB mouth that two paths of signals inputs DSP respectively carry out step-by-step counting to calculate tachometer value.Motor steering can pass through
Enhanced QEP modules in DSP are judged.Encoder_Z is zero signal, can be for pulse count value in dsp
It is zeroed out, prevents count value from overflowing.
As Fig. 9,10 show input circuit, output circuit.The input circuit includes optocoupler TLP521, light emitting diode
LED, LED connection optocoupler TLP521 input sides, optocoupler TLP521 outlet sides connection DSP module.The output electricity
Road includes:Phase inverter TC74HC07AF, optocoupler TLP521, the Darlington transistor of high-voltage large current eight display ULN2804, relay
Device；Phase inverter TC74HC07AF connection optocoupler TLP521 input sides, optocoupler TLP521 outlet sides connection high-voltage large current eight reaches
Islington transistor displays ULN2804, the Darlington transistor of high-voltage large current eight display ULN2804 connection relays.
For the frequency-converter device of complete set, input, delivery outlet are essential.Examined from actual use angle
Consider, it is sometimes desirable to give a certain level signal to switch some states of frequency converter by outside, but outside given level
External disturbance being carried signal, it is impossible to be directly connected to the universaling I/O port of control chip, it is necessary to do corresponding isolation and handle more.
And therefore the internal signal of frequency converter directly can not be connected with the external world, it is also desirable to could be exported after being isolated and being handled.Such as
What the chip used in Fig. 9 was played is the function of reverser, can be by high and low level reverse transformation.Output in Fig. 9 has plenty of
Direct active output, so arranges extension after on the one hand can facilitating to use, on the other hand can pass through phase in software debugging
Indicative function is played in the change of the I/O mouth level answered；And have plenty of and exported by relay, i.e., passive output is mainly used in
Outside fan and soft charge control, strong and weak electric isolution can be played a part of by being used herein relay.
As described in Figure 11 be DC-stabilized circuit, for frequency converter, he can long-time normal work premise
It is exactly a reliable D.C. regulated power supply.Common power solution has three kinds：1st, thyristor supply；2nd, electricity is switched
Source；3rd, linear power supply.In view of linear power supply precision it is good, for ease of maintenaince the features such as.The system is using linear power supply as whole
The dc source of device.The design method of D.C. regulated power supply is as shown in Figure 10.U, V phases line voltage of main circuit are used as power supply electricity
The input on road, is reduced using linear transformer and is exported after voltage class, the alternating current of the low-voltage-grade of output passes through full-bridge again
Required DC voltage is obtained after uncontrollable rectification, the voltage stabilizing of three-terminal voltage-stabilizing chip, capacitor filtering.
The design of protection circuit：
From figure 2 it can be seen that needing current feedback values to realize current closed-loop, while being also required to use current model
Carry out flux observation.Therefore the accurate detection of three-phase current just seems extremely important.Generally using three current sensor difference
Detection wherein three-phase current.
Present invention detection U, V biphase current and DC bus current, the current sensor used is LA-50P, its specified electricity
Flow for 50A, operating voltage is ± 15V, measurement range is -80A-80A, and turn ratio is 1:1000, detection signal output is -80mA
~80mA, Hall magnetic compensation operation principle, measurable DC, AC, pulse current.Figure 12,13 are that U, V biphase current sampled signal are adjusted
Circuit is managed, the current signal of input passes through 41 Ω sampling resistor, is converted to -3V~3V voltage signal, then by following electricity
Road, biasing circuit and diode clamp, the signal voltage range finally obtained are 0~3V, can directly input DSP module：
TMS320F2808 A/D thief hatch.Figure 14 is DC bus current sampled signal modulate circuit, with Figure 13 similar analysis.
A kind of digitlization frequency converter protection circuit of the invention, including over-pressed, under-voltage, overload, excessively stream and overtemperature protection.Cross
Stream protection, can obtain current signal by three current sensors shown in Fig. 2-4, handle right via signal conditioning circuit
The A/D thief hatch of DSP module is sent into afterwards to realize current protection.In order to ensure reliability, hardware protection function is also add, is led to
Cross analog comparator and may determine that whether current value has exceeded setting value, so as to directly give over-current signal, the signal can be with
The resultant fault alarm signal A LM terminals of inverter circuit module make " line or ", and as shown in figure 15, GL ends are sent to DSP module
TZ mouthfuls.
Through treated U, V phase current signal of the current sample shown in Figure 12-14, modulate circuit, the A/ of DSP module is sent into
D mouthfuls participate in computing and logic judgment, illustrate system mistake if the scope that the sampled value of central a certain phase current has exceeded setting
Carry.
D-c bus voltage value is obtained by voltage sensor, overvoltage, under-voltage protection and braking control are realized with this
System.As shown in figure 16, high precision sampling resistance R206-1, R206-2 is all taken as 820 Ω to sampled signal modulate circuit, if at this moment straight
Stream busbar voltage is 800V, and the voltage signal that sampling resistor two ends are obtained is 5V, after RC filtering and voltage follow, is divided into two
Road.It is used to hardware over-voltage all the way protect, i.e., output overvoltage signal TZ_U is sent directly into DSP's after with a fixed level 5V being compared
TZ mouthfuls；Another road then obtains the A/D thief hatch participation computing of 0-3V signal feeding DSP module after partial pressure and logic is sentenced
It is disconnected.Bus voltage value is carried out after logic judgment in DSP module, overvoltage, braking, under-voltage three kinds of operating modes can be drawn respectively.
In addition, to avoid the mistake in motor accelerator from braking, also DSP module adds " permission retarder location ", is when this set
System could effective brake.
Claims (10)
1. the general frequency conversion speed-adjusting system based on DSP, including main circuit, control circuit, protection circuit, it is characterised in that：
The main circuit includes three phase rectifier bridge module, median filter module, inverter circuit module, the connection of three phase rectifier bridge module
Median filter module, median filter module connection inverter circuit module, inverter circuit module connection motor M；
Noninductive Absorption Capacitance C3 is connected between the median filter module and inverter circuit module；
The three phase rectifier bridge module includes three-phase uncontrollable rectifier circuit, for the rectification to three-phase mains, obtains the straight of pulsation
Flow voltage；
The median filter module, for removing Resonance Wave Composition, makes bus voltage value steady；
The noninductive Absorption Capacitance C3, for absorbing high frequency spikes voltage, electric current；
The inverter circuit module, for the break-make by controlling IGBT, exports alternating impulse voltage；
The control circuit includes DSP module, and DSP module connects DSP minimum systems, PWM level shifting circuits, SCI strings respectively
Row communicating circuit, CAN communicating circuit, tach signal process circuit, input circuit, output circuit；
The DSP minimum systems are downloaded mouth, filter circuit and constituted by external crystal-controlled oscillation, power supply, JTAG；
The PWM level shifting circuits include electrical level transferring chip, and DSP module connects optocoupler by PWM level shifting circuits
TLP559, PWM level shifting circuit are used to 3.3V going to 5V；
The tach signal process circuit includes optocoupler, signal processing unit, and photoelectric encoder is connected by signal processing unit
Optocoupler；The signal that photoelectric encoder is sent obtains Encoder_A, Encoder_B after signal processing unit and light-coupled isolation
Two-way orthogonal pulses signal, then two paths of signals is inputted EQEPA, EQEPB mouth progress step-by-step counting of DSP module to calculate respectively
Tachometer value；
The input circuit includes optocoupler, LED, LED connection optocoupler input side, optocoupler outlet side
Connect DSP module；
The output circuit includes:Phase inverter, optocoupler, the Darlington transistor of high-voltage large current eight display, relay；Phase inverter
Optocoupler input side is connected, optocoupler outlet side connection high-voltage large current eight Darlington transistor display, high-voltage large current eight reaches
Islington transistor display connection relay；
The protection circuit includes：The first current sensor for detecting U phase currents；The first electricity for detecting V phase currents
Flow sensor；The 3rd current sensor for detecting DC bus current；For detecting that the voltage of d-c bus voltage value is passed
Sensor；
First, second and third current sensor connects DSP module by current signal conditioning circuit；First, second and third electric current is passed
Sensor obtains current signal, the A/D thief hatch for being then fed into DSP module is handled via signal conditioning circuit, for realizing electric current
Protection；
The voltage sensor connects DSP module by voltage signal conditioning circuit；
The voltage signal conditioning circuit includes sampling resistor R206-1, R206-2, sampling resistor R206-1, R206-2 two ends institute
The voltage signal of acquisition is 5V, after RC filtering and voltage follow, is divided into two-way：It is used to hardware over-voltage all the way protect, i.e., with one
The relatively rear output overvoltage signal TZ_U of individual fixed level 5V are sent directly into the TZ mouths of DSP module；Then obtained after partial pressure on another road
The signal for obtaining 0-3V sends into the A/D thief hatch of DSP module.
2. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The noninductive Absorption Capacitance
C3 is 1 μ F/1200VDC noninductive Absorption Capacitance.
3. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The three-phase commutation bridge mould
Block is MDS50A/1600V three phase rectifier bridge modules.
4. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The inverter circuit module
For 7 unit IPM module 7MBP75RA120 of company of Fuji, it be internally integrated 7 IGBT, drive circuit, protection module with
And braking circuit.
5. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The inverter circuit module
The failure output ALM terminals of external one, can block PWM by microprocessor in failure and export, play a protective role.
6. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The median filter module
Electric capacity C1, C2 by two 2200 μ F/400V is in series, has both met the technical need to filter capacitor, while electric capacity
Price and volume can also receive.
7. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The control circuit is also wrapped
D.C. regulated power supply is included, U, V phases line voltage of main circuit reduce voltage etc. as the input of power circuit using linear transformer
Exported after level, the alternating current of the low-voltage-grade of output is again by the uncontrollable rectification of full-bridge, the voltage stabilizing of three-terminal voltage-stabilizing chip, electric capacity filter
Required DC voltage is obtained after ripple.
8. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The protection circuit includes
Analog comparator, judges whether current value has exceeded setting value, so that over-current signal is directly given, the signal and inverter circuit
The resultant fault alarm signal A LM terminals of module make " line or ".
9. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：First, second and third electricity
Flow sensor is LA-50P current sensors.
10. the general frequency conversion speed-adjusting system based on DSP according to claim 1, it is characterised in that：The DSP module increase
" permission retarder location ", when this set, system could effective brake.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108539962A (en) * | 2018-04-27 | 2018-09-14 | 浙江大维高新技术股份有限公司 | A kind of integrated elevator variable frequency device |
| WO2019088878A1 (en) * | 2017-11-01 | 2019-05-09 | Виктор Николаевич ТИМОФЕЕВ | Power supply for an inductor |
| CN109739172A (en) * | 2019-01-03 | 2019-05-10 | 苏州巨联电气有限公司 | A kind of frequency converter checking platform |
| CN110265965A (en) * | 2019-07-05 | 2019-09-20 | 贵州航天控制技术有限公司 | A kind of intelligent protection circuit adapting to high-power electric rudder system |
| CN110474598A (en) * | 2019-08-22 | 2019-11-19 | 广东职业技术学院 | A kind of SPWM frequency conversion speed-adjusting system and its control method based on FPGA |
| CN110690685A (en) * | 2019-09-06 | 2020-01-14 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN110899837A (en) * | 2018-09-18 | 2020-03-24 | 南京德朔实业有限公司 | Electric tool and starting method thereof |
| CN112366925A (en) * | 2020-11-05 | 2021-02-12 | 杭州西通电气技术有限公司 | Novel frequency converter drive plate |
| CN112398414A (en) * | 2019-08-16 | 2021-02-23 | 泛仕达机电股份有限公司 | Two-phase stepless variable frequency speed regulation control circuit and method for household purifier |
| CN112422019A (en) * | 2020-11-10 | 2021-02-26 | 广东交通职业技术学院 | Universal application circuit and method for three-phase, two-phase and single-phase resistance sampling |
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| WO2019088878A1 (en) * | 2017-11-01 | 2019-05-09 | Виктор Николаевич ТИМОФЕЕВ | Power supply for an inductor |
| CN108539962A (en) * | 2018-04-27 | 2018-09-14 | 浙江大维高新技术股份有限公司 | A kind of integrated elevator variable frequency device |
| CN110899837A (en) * | 2018-09-18 | 2020-03-24 | 南京德朔实业有限公司 | Electric tool and starting method thereof |
| CN109739172A (en) * | 2019-01-03 | 2019-05-10 | 苏州巨联电气有限公司 | A kind of frequency converter checking platform |
| CN110265965A (en) * | 2019-07-05 | 2019-09-20 | 贵州航天控制技术有限公司 | A kind of intelligent protection circuit adapting to high-power electric rudder system |
| CN112398414B (en) * | 2019-08-16 | 2024-06-04 | 泛仕达机电股份有限公司 | Two-phase stepless variable-frequency speed regulation control circuit and method for household purifier |
| CN112398414A (en) * | 2019-08-16 | 2021-02-23 | 泛仕达机电股份有限公司 | Two-phase stepless variable frequency speed regulation control circuit and method for household purifier |
| CN110474598A (en) * | 2019-08-22 | 2019-11-19 | 广东职业技术学院 | A kind of SPWM frequency conversion speed-adjusting system and its control method based on FPGA |
| CN110690685A (en) * | 2019-09-06 | 2020-01-14 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN110690685B (en) * | 2019-09-06 | 2020-11-24 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN113515101A (en) * | 2020-04-10 | 2021-10-19 | 上海埃迪特动力技术有限公司 | Vehicle motor controller auxiliary test equipment that rolls off production line |
| CN112366925A (en) * | 2020-11-05 | 2021-02-12 | 杭州西通电气技术有限公司 | Novel frequency converter drive plate |
| CN112422019A (en) * | 2020-11-10 | 2021-02-26 | 广东交通职业技术学院 | Universal application circuit and method for three-phase, two-phase and single-phase resistance sampling |
| CN113107803A (en) * | 2021-04-13 | 2021-07-13 | 南通大学 | Quick stop device of polyester melt metering pump for chemical industry |
| CN113107803B (en) * | 2021-04-13 | 2022-08-19 | 南通大学 | Quick stop device of polyester melt metering pump for chemical industry |
| CN114123759A (en) * | 2021-11-30 | 2022-03-01 | 上海南芯半导体科技股份有限公司 | Alternating current-direct current converter and control method thereof |
| CN114123759B (en) * | 2021-11-30 | 2024-01-26 | 上海南芯半导体科技股份有限公司 | AC-DC converter and control method thereof |
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Denomination of invention: A General Variable Frequency Speed Control System Based on DSP Granted publication date: 20231020 Pledgee: Changyang HSBC and Financing Guarantee Co.,Ltd. Pledgor: YICHANG QINGJIANG ELECTRIC Co.,Ltd. Registration number: Y2024980033980 |