CN106773932A - Digitlization based on FPGA is by ripple current limiting system and guard method - Google Patents
Digitlization based on FPGA is by ripple current limiting system and guard method Download PDFInfo
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- CN106773932A CN106773932A CN201611110590.9A CN201611110590A CN106773932A CN 106773932 A CN106773932 A CN 106773932A CN 201611110590 A CN201611110590 A CN 201611110590A CN 106773932 A CN106773932 A CN 106773932A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
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Abstract
The present invention provides a kind of digitlization based on FPGA by ripple current limiting system, it includes current measurement circuit, electronic power switch device and switching device drive circuit, also include analog converting circuit, A/D converter circuit and fpga chip, the wherein electric current of the switching device that current measurement circuit is detected, turn into through analog converting circuit transformations and be adapted to the signal that A/D converter circuit is gathered, data signal is converted to by A/D converter circuit, fpga chip obtains the data signal, carry out excessively stream judgement, output pulse width signal dutyfactor drives electronic power switch device to switching device drive circuit.The present invention realizes that by ripple current limit the arithmetic speed of FPGA is exceedingly fast using digitizing solution（Tens MHz are can reach, and calculation function is stronger）, wave limiting function can add increasingly complex algorithm, and efficient fault tolerant mechanism so that have flexibility higher, safety and reliability by ripple current limiting system.
Description
Technical field
The present invention relates to electronic power switch device overcurrent protection field, and in particular to a kind of digitlization based on FPGA by
Ripple current limiting system and guard method.
Background technology
With continuing to develop for power electronic devices and control technology, Technics of Power Electronic Conversion system driven in industrial electric,
Communications and transportation, power system, communication system, and new energy field are widely applied.And the voltage of switching device
Grade and current class also more and more higher, the requirement to the safe and stable operation ability of Technics of Power Electronic Conversion system equally also have sternly
Lattice requirement.And in actual applications, main circuit is likely to occur short circuit or the unexpected fluctuation of electric current, although power electronics can be utilized
The current foldback circuit that device itself is provided realizes the judgement of excessively stream, and the locking of switching device is completed by control system, but
The threshold value of power electronic devices itself overcurrent protection is high, and can not carry out flexible modulation, while being by exclusive circuit and control
The intrinsic time delay of system, also results in protection process execution time more long.Therefore, after there is flow problem, to electric power electricity
The excessively stream impact influence of sub switch device is very big.
Ideal method is to take the method by ripple current limit, but at present in the technical implementation method
Mainly based on analog circuit realization, for the timing sampling using microprocessor, analog circuit speed is fast, can be quick
Current-limiting function is realized, but analog circuit also deposits following problem：（1）Analog Circuit Design is complex, is not easy to later stage liter
Level.And analog circuit, when realizing that the wave limiting of multiple switch device is protected, each device is required to the independent circuit of configuration, is
System complexity is improved.（2）Analog circuit is difficult to the algorithm and fault tolerance of complexity.（3）In analog circuit, fluxion is crossed
Value, excessively stream return to numerical value, minimum pulse width numerical value and once set, it is impossible to realize online modification, and complicated information is difficult to and microprocessor
Device is interacted.（4）Analog circuit is only only completed wave limiting function, and control system still needs.
The content of the invention
The technical problem to be solved in the present invention is：A kind of digitlization based on FPGA is provided by ripple current limiting system and guarantor
Maintaining method so that there is flexibility higher, safety and reliability by ripple current limiting system.
The present invention is for the solution technical scheme taken of above-mentioned technical problem：A kind of digitlization based on FPGA is by ripple electricity
Ductility limit system, it includes current measurement circuit, electronic power switch device and switching device drive circuit, it is characterised in that：
It also includes analog converting circuit, A/D converter circuit and fpga chip, the switching device that wherein current measurement circuit is detected
Electric current, turns into through analog converting circuit transformations and is adapted to the signal that A/D converter circuit is gathered, and digital letter is converted to by A/D converter circuit
Number, fpga chip obtains the data signal, carries out excessively stream judgement, and output pulse width signal dutyfactor drives to switching device drive circuit
Dynamic electronic power switch device.
By said system, described current measurement circuit is current sensor, photo-electricity mutual-inductor or hall device.
By said system, described electronic power switch device is several, and each electronic power switch device is to that should have
One group of current measurement circuit, switching device drive circuit, analog converting circuit and A/D converter circuit, each A/D converter circuit difference
It is connected with described fpga chip, fpga chip is connected with each switching device drive circuit respectively.
By said system, it also includes the microprocessor for sharing fpga chip algorithm, connects with described fpga chip
Connect.
A kind of current protection method of digitlization based on FPGA by ripple current limiting system, it is characterised in that：It includes
Following steps：
Signal acquisition：The current signal of the electronic power switch device after collection analog-to-digital conversion；
Pulse width signal dutycycle normal value is calculated：Under normal condition, the current signal of electronic power switch device is less than or equal to
Excessively stream setting value, pulse width signal dutycycle normal value is calculated by described current signal；
The current signal of electronic power switch device judges and control：When the current signal of electronic power switch device is more than excessively stream
During setting value, pulse width signal dutycycle is reduced to default minimum and is sent to switching device drive circuit, until power electronics
When the current signal of switching device returns to setting value less than excessively stream, pulse width signal dutycycle is being reverted into pulse width signal dutycycle just
Constant value.
As stated above, while gathering the current signal of several electronic power switch devices, it is respectively controlled.
As stated above, described pulse width signal dutycycle normal value is calculated, and is completed by microprocessor；Electronic power switch
The current signal of device judges and controls, completed by fpga chip.
As stated above, during signal acquisition, the sample frequency of analog-to-digital conversion is 100kHz-1Mhz.
Beneficial effects of the present invention are：
1st, realize that by ripple current limit the arithmetic speed of FPGA is exceedingly fast using digitizing solution（Can reach tens MHz, and computing
Function is stronger）, wave limiting function can add increasingly complex algorithm, and efficient fault tolerant mechanism so that by ripple electric current
Limitation system has flexibility higher, safety and reliability.
2nd, after from the A/D chip of multichannel, the current detecting of multiple switch device can be once realized, realizes multiple switch
Device by ripple current limit.
3rd, in the multiple electronic power switch devices of control, pulse width signal dutycycle is completed by increasing microprocessor
Calculate, FPGA can transmit information, microprocessor and FPGA paired runnings to microprocessor in time, and the safety for further improving system is steady
It is qualitative.
Brief description of the drawings
Fig. 1 is the system principle diagram of one embodiment of the invention.
Fig. 2 is the system principle diagram of further embodiment of this invention.
Fig. 3 is that switching device drive signal generates schematic diagram.
Fig. 4 is the method flow diagram of one embodiment of the invention.
Specific embodiment
With reference to instantiation and accompanying drawing, the present invention will be further described.
Embodiment one：
As shown in figure 1, a kind of digitlization based on FPGA includes that current measurement circuit, power electronics are opened by ripple current limiting system
Device and switching device drive circuit are closed, also including analog converting circuit, A/D converter circuit and fpga chip, wherein current measurement
The electric current of the switching device that electric circuit inspection is arrived, turns into through analog converting circuit transformations and is adapted to the signal that A/D converter circuit is gathered, by
A/D converter circuit is converted to data signal, and fpga chip obtains the data signal, carries out excessively stream judgement, output pulse width signal duty
Than driving electronic power switch device to switching device drive circuit.
A kind of above-mentioned digitlization based on FPGA by ripple current limiting system current protection method, such as Fig. 3 and Fig. 4 institutes
Show, comprise the following steps：
Signal acquisition：The current signal of the electronic power switch device after collection analog-to-digital conversion；
Pulse width signal dutycycle normal value is calculated：Under normal condition, the current signal of electronic power switch device is less than or equal to
Excessively stream setting value, pulse width signal dutycycle normal value is calculated by described current signal；
The current signal of electronic power switch device judges and control：When the current signal of electronic power switch device is more than excessively stream
During setting value, pulse width signal dutycycle is reduced to default minimum and is sent to switching device drive circuit, until power electronics
When the current signal of switching device returns to setting value less than excessively stream, pulse width signal dutycycle is being reverted into pulse width signal dutycycle just
Constant value.
Described current measurement circuit is current sensor, photo-electricity mutual-inductor or hall device, it is possible to achieve current measurement
Device, the current signal of measurement can be that of ac can also be DC quantity.Such as LT208-S7 conducts of selection LEM companies
Measurement original paper, the specified measurement electric current of its primary side is 200A, and the specified virtual value of secondary is 100mA.
Analog converting circuit, according to selected LEM current sensors, the analog converting circuit is needed the electricity of 100mA
Stream signal is filtered, nurses one's health and amplifies, and conversion obtains rational voltage, there is provided to A3The acceptable conjunction of AD conversion chip institute
Reason voltage range.5V is transformed into view of nargin 100mA proper, then A2The no-load voltage ratio of analog converting circuit is 40A/V.
Switching device drive circuit receives the pulse-width control signal from fpga chip and completes electronic power switch device
Drive control.Drive circuit may be selected, the binary channels of CONCEPT companies, compact drive module 2SC0108T.Switching device can
The FF200R12KS4 of selection EUPEC companies, rated current is 200A.
Embodiment two：
The general principle of the present embodiment is identical with embodiment one, and its difference is：As shown in Fig. 2 described power electronics
Switching device be several, each electronic power switch device to should have one group of current measurement circuit, switching device drive circuit,
Analog converting circuit and A/D converter circuit, each A/D converter circuit are connected with described fpga chip respectively, fpga chip difference
It is connected with each switching device drive circuit.
Wherein several A/D converter circuits can be integrated into A/D chip, and user can determine AD cores according to practical object requirement
The passage way of piece, sampling resolution and sampling rate.When A/D chip is multichannel, the electricity of multiple switch device can be simultaneously completed
Stream sampling, support is provided for the multiple devices of realization by ripple current limit.For example A/D chip can be AD7606, and the chip can be with
The AD conversion on 16,8 tunnel is completed simultaneously.
FPGA chip circuit completes the data acquisition of A/D chip, and wave limiting protection algorism.Fpga chip can be
Any company or the chip of brand.According to the capacity of programmed algorithm, and complete the function suitable size of selection.And FPGA
Various control algolithms and tolerant fail algorithm can also be write according to user's request.If multiple devices, then FPGA can be according to reality
Situation sets more control ports.Fpga chip may be selected the xc6slx45t series cores of the Sprtan6 series of Xilinx companies
Piece.
When the electronic power switch device of control is more, simple may be excessive by fpga chip amount of calculation, now increases
Plus microprocessor aids in fpga chip to be calculated.Microprocessor, can be the chip of any company or brand, can
Type selecting is carried out with design according to user function, and completion function.For example：The model dsp chip of TI companies 28335 may be selected.
The digitlization based on FPGA of the present embodiment by ripple current limiting system current protection method, while collection it is some
The current signal of individual electronic power switch device, is respectively controlled.Described pulse width signal dutycycle normal value is calculated, by micro-
Processor is completed；The current signal of electronic power switch device judges and controls, completed by fpga chip.Specifically set more than
Meter, it is assumed that the overcurrent value by ripple current limit is 200A, and it is 180A that excessively stream returns to setting value, and it specifically includes following steps：
Step 1：AD samples, and obtains real-time electric current, and judge that whether electric current, more than overcurrent value 200A, is walked if entering more than if
Rapid 2, any control is not carried out otherwise, only electric current is monitored.
Step 2：If electric current is more than 200A, open by ripple current limit at once, dutycycle is set as 1000, and pass through
Switching device drive circuit completes the control of electronic power switch device, and sends information needed to microprocessor.With
The setting of smaller dutycycle, electric current can be gradually reduced.When electric current returns to setting value 180A less than excessively stream, into step 3.
Step 3：Being exited by ripple current limit function in FPGA, the dutycycle of switching device maintains initial value constant.
Preferably, the sample frequency of analog-to-digital conversion is 100kHz-1Mhz, and its speed depends on A/D chip conversion speed, with
And the arithmetic speed of FPGA.The sample rate of analog-to-digital conversion is faster, and control accuracy is higher, but the cost of A/D chip is also high, can
Preferentially chosen according to application scenario.
The present invention replaces traditional analog comparator to complete the wave limiting of power electronic devices using digitizer
Function, its feasibility includes with feature：
（1）A/D chip sample rate has reached hundreds of kHz, or even MHz ranks, realizes being limited by ripple electric current using digitizing solution
System, compared with analog circuit, after sampling section has not had technical obstruction, and the A/D chip of selection multichannel, can be once
The current detecting of multiple switch device is realized, support is provided by ripple current limit for the multiple devices of realization；
（2）Using software program realize traditional analog circuit formula wave limiting circuit, it is to avoid complicated Analog Circuit Design,
Multiple devices can simultaneously be realized also can conveniently realize that systemic-function is upgraded by the protection of ripple current limit, and later stage；
（3）After digitlization, wave limiting function can add increasingly complex algorithm, and efficient fault tolerant mechanism, can enter one
Walk the security and stability of raising system；
（4）FPGA can be with microprocessor interactive information, excessively stream numerical value, return numerical value by ripple limitation electric current, and minimum pulse width
Numerical value can carry out offline or online modification according to different application objects, there are overcurrent events and after excessively stream is returned,
FPGA also can transmit information to microprocessor in time, thus can further improve control system performance；
（5）Microprocessor model can be chosen as requested, and with FPGA paired runnings, FPGA can also write control and calculate
Method, departs from microprocessor isolated operation.
Above example is merely to illustrate design philosophy of the invention and feature, its object is to make technology in the art
Personnel will appreciate that present disclosure and implement according to this that protection scope of the present invention is not limited to above-described embodiment.So, it is all according to
The equivalent variations made according to disclosed principle, mentality of designing or modification, within protection scope of the present invention.
Claims (8)
1. by ripple current limiting system, it includes current measurement circuit, electronic power switch device for a kind of digitlization based on FPGA
Part and switching device drive circuit, it is characterised in that：It also includes analog converting circuit, A/D converter circuit and fpga chip, its
The electric current of the switching device that middle current measurement circuit is detected, turns into through analog converting circuit transformations and is adapted to A/D converter circuit collection
Signal, data signal is converted to by A/D converter circuit, fpga chip obtains the data signal, carries out excessively stream judgement, exports arteries and veins
Bandwidth signals dutycycle drives electronic power switch device to switching device drive circuit.
2. the digitlization based on FPGA according to claim 1 is by ripple current limiting system, it is characterised in that：Described electricity
Flow measurement circuitry is current sensor, photo-electricity mutual-inductor or hall device.
3. the digitlization based on FPGA according to claim 1 is by ripple current limiting system, it is characterised in that：Described electricity
Power electronic switching device is several, and each electronic power switch device drives to that should have one group of current measurement circuit, switching device
Dynamic circuit, analog converting circuit and A/D converter circuit, each A/D converter circuit are connected with described fpga chip respectively, FPGA cores
Piece is connected with each switching device drive circuit respectively.
4. the digitlization based on FPGA according to claim 3 is by ripple current limiting system, it is characterised in that：It also includes
Microprocessor for sharing fpga chip algorithm, is connected with described fpga chip.
5. the digitlization based on FPGA described in a kind of claim 1 is by the current protection method of ripple current limiting system, and it is special
Levy and be：It is comprised the following steps：
Signal acquisition：The current signal of the electronic power switch device after collection analog-to-digital conversion；
Pulse width signal dutycycle normal value is calculated：Under normal condition, the current signal of electronic power switch device is less than or equal to
Excessively stream setting value, pulse width signal dutycycle normal value is calculated by described current signal；
The current signal of electronic power switch device judges and control：When the current signal of electronic power switch device is more than excessively stream
During setting value, pulse width signal dutycycle is reduced to default minimum and is sent to switching device drive circuit, until power electronics
When the current signal of switching device returns to setting value less than excessively stream, pulse width signal dutycycle is being reverted into pulse width signal dutycycle just
Constant value.
6. current protection method according to claim 5, it is characterised in that：Gather several electronic power switch devices simultaneously
The current signal of part, is respectively controlled.
7. current protection method according to claim 6, it is characterised in that：Described pulse width signal dutycycle normal value meter
Calculate, completed by microprocessor；The current signal of electronic power switch device judges and controls, completed by fpga chip.
8. current protection method according to claim 6, it is characterised in that：During signal acquisition, the sampling of analog-to-digital conversion is frequently
Rate is 100kHz-1Mhz.
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Cited By (4)
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| CN108011506A (en) * | 2017-11-23 | 2018-05-08 | 郑州云海信息技术有限公司 | A kind of Current limited Control method and system of inverter |
| CN110247615A (en) * | 2018-03-09 | 2019-09-17 | 深圳市蓝海华腾技术股份有限公司 | Wave limiting control system, method and electric machine controller based on dsp chip |
| CN116885937A (en) * | 2023-09-04 | 2023-10-13 | 西安千帆翼数字能源技术有限公司 | Four-phase four-bridge arm inverter wave-by-wave current limiting method and system |
| WO2023245917A1 (en) * | 2022-06-23 | 2023-12-28 | 宁波中车时代传感技术有限公司 | Overcurrent detection circuit and method suitable for alternating currents |
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