CN105186854A - DSP-based digital PFC acquisition control system and method - Google Patents
DSP-based digital PFC acquisition control system and method Download PDFInfo
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- CN105186854A CN105186854A CN201510655694.7A CN201510655694A CN105186854A CN 105186854 A CN105186854 A CN 105186854A CN 201510655694 A CN201510655694 A CN 201510655694A CN 105186854 A CN105186854 A CN 105186854A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a DSP-based digital PFC acquisition control system and method and belongs to power supply technical field. The DSP-based digital PFC acquisition control system comprises a signal acquiring unit, an amplifying unit, a DSP control unit, and a driving unit. The signal acquiring unit is connected with the output end of a PFC circuit and is used for acquiring the output signal of the PFC circuit. The signal acquiring unit is connected with the amplifying unit and is used for filtering and amplifying an acquired signal. A filtering and amplifying unit is connected with the DSP control unit. The DSP control unit is connected with the signal acquiring unit and the driving unit. The driving unit is connected with the main switch tube of the PFC circuit and controls the on-off state of the main switch tube according to an instruction of the DSP control unit. The DSP-based digital PFC acquisition control system and method solve problems that elements of the PFC circuit are liable to aging and a control method is out of date and low in conversion efficiency, have advantages of full digital processing, simplified PFC circuit design, and high conversion efficiency, prolong a service life, greatly reduce cost, and are suitable for batch production.
Description
Technical field
The invention belongs to power technique fields, be specifically related to a kind of digitlization PFC acquisition control system based on DSP and method.
Background technology
The English full name of PFC is " PowerFactorCorrection ", be meant to " power factor correction ", power factor refers to the relation between effective power and total power consumption (apparent power), and namely effective power is divided by the ratio of total power consumption (apparent power).Substantially power factor can weigh the degree that electric power is used effectively, and when power factor value is larger, represents its electric power utilance higher.Power factor is used to the parameter weighing power consumption equipment power consumption efficiency, and low power factor represents low electric power efficiency.In order to the technology improving power consumption equipment power factor is just called power factor correction.
Pfc circuit on market mainly adopts analogy method design, there is components and parts easily aging, the shortcoming such as control method is backward, conversion efficiency is low, pfc circuit digital collection controls to there is the problems such as sampling precision is low, A/D switching rate is slow, peripheral circuit is lengthy and jumbled simultaneously, seriously hinders the development of pfc circuit technology.
Summary of the invention
According to above the deficiencies in the prior art, technical problem to be solved by this invention proposes a kind of digitlization PFC acquisition control system based on DSP and method, the total digitalization process that pfc circuit collection is controlled is achieved by dsp chip, enormously simplify pfc circuit design, solve pfc circuit components and parts easily aging, control method is backward, conversion efficiency is low problem, there is the advantage that total digitalization processes, simplification pfc circuit designs, conversion efficiency is high, improve useful life and greatly reduce costs, being applicable to mass production.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of digitlization PFC acquisition control system based on DSP, described digitlization PFC acquisition control system is connected between the rectification filter circuit output end of pfc circuit and main switch, digitlization PFC acquisition control system comprises signal gathering unit, amplifying unit, DSP control unit and driver element, the input of signal gathering unit is connected to the output of pfc circuit for gathering the output signal of pfc circuit, the input that the output of signal gathering unit connects filter and amplification unit after filtering amplifying unit carries out signal filtering to the signal gathered and amplifies process, the output of filter and amplification unit connects the input of DSP control unit and the signal after input processing carries out signal judgement to DSP control unit, the output of DSP control unit connects collecting unit and driver element, DSP control unit is according to the sampling rate of input signal output order to collecting unit and driver element control break collecting unit, driver element connects the break-make of the main switch of pfc circuit the instruction control main switch according to DSP control unit.
In said system, filter and amplifying circuit is provided with in described amplifying unit, the clutter that the input that the input interface of filter connects collecting unit is used in filtering collection signal, the output interface of filter connects amplifying circuit and amplifying signal in input signal to amplifying circuit.Be provided with comparand register and reference voltage level in described DSP control unit, comparand register carries out data with reference to magnitude of voltage with the signal of input dsp controller and compares.Be provided with D/A converting circuit and threshold value in described DSP control unit, the signal of D/A converting circuit to input carries out digital-to-analogue conversion and the digital signal result of logarithmic mode conversion and threshold value compare judgement.Described pfc circuit comprises rectifier bridge, filtering booster circuit, main switch, current rectifying and wave filtering circuit and relay conversion circuit, voltage input bridge, booster circuit, main switch, current rectifying and wave filtering circuit, relay conversion circuit after filtering, exports the secondary circuit connecting relay conversion circuit to.
Based on a digitlization PFC collection control method of DSP, described method step comprises: step one, gather PFC output voltage U by signal gathering unit
0signal value, the voltage signal of collection amplifies process after filtering, obtains output signal U m; Step 2, Um inputed in corresponding DSP control unit comparand register, control according to the employing speed of Um size to signal gathering unit simultaneously, the reference voltage Ut that collection signal Um and DSP in comparand register sets is contrasted, judges whether Um is more than or equal to Ut; If step 3 Um is more than or equal to Ut, then DSP stops output signal, and DSP stops producing PWM ripple, and pfc circuit quits work; If step 4 Um is less than Ut, then DSP control unit processes error information according to algorithm, and DSP control unit regulates sampling algorithm, changes sampling interval and sampling rate.The error signal St of step 5, calculating signal value Um and reference voltage level Ut, whether error in judgement signal St is less than threshold value δ; If step 6 error signal St is less than or equal to threshold value δ, then DSP control unit stops exporting, if error signal is greater than threshold value δ, then regulates modified model PI algorithm, changes the output signal of DSP, the sampling rate of conditioning signal collecting unit.
In said method, described method comprises digital collection method: carry out signals collecting, device filtering clutter after filtering by signal gathering unit to PFC output signal, again this signal is amplified, be input in DSP control unit, if Um is more than or equal to Ut, pfc circuit quits work; Otherwise if DSP control unit carries out digital-to-analogue conversion to sampled signal according to sampled value, obtains exact figure signal, and according to the sampling rate of sampling algorithm real-time control signal collecting unit and sampled point interval.Described method comprises digitalization control method: pre-set reference voltage Ut and threshold value δ according to actual needs, when DSP control unit obtains sampled signal Um, if | Ut-Um|≤δ, DSP stops producing drive singal, if | Ut-Um|> δ, reference voltage Ut in Um and comparand register is contrasted, obtain error signal St, according to the size of St, transfer function in amendment modified model PI algorithm, iterations and target final value are regulated and controled, changes the drive singal duty ratio exporting driver element.In described method, the formula of PI algorithm transfer function is:
in formula, k is proportionality coefficient, T
ifor the time of integration.The setting permissible value of δ system.In described method step six, digital signal is converted to analog drive signal by DSP control unit automatically, produce the PWM drive waveforms of a controllable duty ratio, through driver element process, be converted to signal main switch being opened or turns off, drive the running of main switch to control pfc circuit and export.
Beneficial effect of the present invention is: 1. achieved the total digitalization process controlled pfc circuit collection by dsp chip, enormously simplify the circuit design of PFC, improves useful life and greatly reduces costs, and is applicable to mass production.2. improve the operating efficiency of pfc circuit and the precision of collection, the conversion between digital signal and analog signal is also more rapidly with efficient.3. realize the real-time regulating and control to drive singal, output voltage, stable output, protection secondary circuit.4. add system permissible value, optimize the transfer function of PI algorithm, DSP uses the PI algorithm improved to control in real time, realizes PFC regulative mode more flexible.
Accompanying drawing explanation
Below the content expressed by this Figure of description and the mark in figure are briefly described:
Fig. 1 is the work structuring block diagram of the acquisition control system of the specific embodiment of the present invention;
Fig. 2 is the DSP sampling flow chart of the specific embodiment of the present invention;
Fig. 3 is the DSP control flow chart of the specific embodiment of the present invention.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.
A kind of digitlization PFC acquisition control system based on DSP, as shown in Figure 1, digitlization PFC acquisition control system is connected between the rectification filter circuit output end of pfc circuit and main switch, pfc circuit comprises rectifier bridge, filtering booster circuit, main switch, current rectifying and wave filtering circuit and relay conversion circuit, 220V line voltage input rectifying bridge, booster circuit, main switch, current rectifying and wave filtering circuit, relay conversion circuit after filtering, exports the secondary circuit connecting relay conversion circuit to.Digitlization PFC acquisition control system is connected between the rectification filter circuit output end of pfc circuit and main switch, gather the output voltage signal of pfc circuit and carry out sampled voltage judgement, DSP control unit carries out break-make control and self regulating and control according to the sampling rate of sampled result to pfc circuit transfer change owner switching tube and acquisition control system.
Digitlization PFC acquisition control system comprises signal gathering unit, amplifying unit, DSP control unit and driver element, signal gathering unit connects current rectifying and wave filtering circuit, amplifying unit connection signal collecting unit, DSP control unit connects amplifying unit and signal gathering unit, and driver element connects main switch.The input of signal gathering unit is connected to the output of pfc circuit for gathering the output signal of pfc circuit, the input that the output of signal gathering unit connects filter and amplification unit after filtering amplifying unit carries out signal filtering to the signal gathered and amplifies process, the output of filter and amplification unit connects the input of DSP control unit and the signal after input processing carries out signal judgement to DSP control unit, the output of DSP control unit connects collecting unit and driver element, DSP control unit is according to the sampling rate of input signal output order to collecting unit and driver element control break collecting unit, driver element connects the break-make of the main switch of pfc circuit the instruction control main switch according to DSP control unit.
Be provided with filter and amplifying circuit in amplifying unit, the clutter that the input that the input interface of filter connects collecting unit is used in filtering collection signal, the output interface of filter connects amplifying circuit and amplifying signal in input signal to amplifying circuit.The output signal of signal gathering unit is input in amplifying unit carries out signal filtering amplification process, and the signal after process is input in DSP control unit.Comparand register, reference voltage level, D/A converting circuit and threshold value is provided with in DSP control unit, comparand register carries out data with reference to magnitude of voltage with the signal of input dsp controller and compares, gather voltage and be more than or equal to reference voltage level then DSP control unit output termination signal, close main switch, otherwise the collection voltage after process is less than reference voltage level, the signal of D/A converting circuit to input carries out digital-to-analogue conversion and the digital signal result of logarithmic mode conversion and threshold value compare judgement, the sampling rate of adjustment acquisition control system.For realizing the digitlization PFC collection control method of this DSP, employing GreenHillsTools and carrying out programming.
Based on a digitlization PFC collection control method of DSP, method step comprises:
Step one, signal gathering unit gather PFC output voltage U
0signal value, the voltage signal of collection amplifies process after filtering, obtains output signal U m.Signal gathering unit gathers the magnitude of voltage U of PFC output circuit
0, be input in amplifying unit and carry out filter amplifying processing, the clutter in filtered signal also carries out signal amplification, draws the output signal U m of amplifying unit.
Step 2, Um inputed in corresponding DSP control unit comparand register, control according to the employing speed of Um size to signal gathering unit simultaneously, the reference voltage Ut that collection signal Um and DSP in comparand register sets is contrasted, judges whether Um is more than or equal to Ut.
If step 3 Um is more than or equal to Ut, then DSP stops output signal, and DSP stops producing PWM ripple, and pfc circuit quits work.
If step 4 Um is less than Ut, then DSP control unit processes error information according to algorithm, obtains output valve signal Us, and DSP control unit regulates sampling algorithm, changes sampling interval and sampling rate.
The error signal St of step 5, calculating signal value Um and reference voltage level Ut, whether error in judgement signal St is less than threshold value δ;
If step 6 error signal is less than or equal to threshold value δ, then DSP control unit stops exporting, and closes main switch, if error signal is greater than threshold value δ, then regulates modified model PI algorithm, changes the output signal of DSP, the sampling rate of conditioning signal collecting unit.The signal of DSP control unit is through D/A conversion and driver element, and be converted to signal main switch being opened or turns off, the output signal of main switch through current rectifying and wave filtering circuit and relay conversion circuit, then passes to the secondary circuit of pfc circuit.The automatic just digital signal of DSP control unit is converted to analog drive signal, produce the PWM drive waveforms of a controllable duty ratio, through driver element process, be converted to signal main switch being opened or turns off, drive the running of main switch to control pfc circuit and export.
Collection control method comprises digital collection method and digitalization control method, as shown in Figure 2, digital collection method is specially: carry out signals collecting by signal gathering unit to PFC output signal, device filtering clutter after filtering, again this signal is amplified, be input in DSP control unit, if Um is more than or equal to Ut, pfc circuit quits work; Otherwise if DSP control unit carries out digital-to-analogue conversion to sampled signal according to sampled value, obtains exact figure signal, and according to the sampling rate of sampling algorithm real-time control signal collecting unit and sampled point interval.
As shown in Figure 3, digitalization control method is specially: pre-set reference voltage Ut and threshold value δ according to actual needs, when DSP control unit obtains sampled signal Um, if | Ut-Um|≤δ, DSP stops producing drive singal, if | Ut-Um|> δ, reference voltage Ut in Um and comparand register is contrasted, obtain error signal St, according to the size of St, transfer function in amendment modified model PI algorithm, double regulation control can be carried out to iterations and target final value simultaneously, the duty ratio of further change output drive signal, reach the stable object exported.In method, the formula of PI algorithm transfer function is:
in formula, k is proportionality coefficient, T
ifor the time of integration.δ is the setting permissible value of system, is carried out the precision prescribed of certainty annuity by the size arranging this threshold value, and in formula, k is proportionality coefficient, T
ifor the time of integration.By DSP control unit, A/D sampling and conversion are realized to output voltage, further full-digital control is realized to sampling interval and sampled point, DSP control unit is changed the D/A of drive singal, produces the PWM square wave of adjustable duty cycle, as the drive singal of PFC main switch.When the present invention changes collection of simulant signal, the shortcoming of loaded down with trivial details, the component aging of circuit, effectively raises sampling precision, improves sample rate.Follow-on PI algorithm, by comparing image data, controls iterations and the target final value of self in real time, regulates the duty ratio of drive singal, reduce energy loss, stablizes PFC output, improves power factor.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.The protection range that protection scope of the present invention should limit with claims is as the criterion.
Claims (10)
1. the digitlization PFC acquisition control system based on DSP, it is characterized in that, described digitlization PFC acquisition control system is connected between the rectification filter circuit output end of pfc circuit and main switch, digitlization PFC acquisition control system comprises signal gathering unit, amplifying unit, DSP control unit and driver element, the input of signal gathering unit is connected to the output of pfc circuit for gathering the output signal of pfc circuit, the input that the output of signal gathering unit connects filter and amplification unit after filtering amplifying unit carries out signal filtering to the signal gathered and amplifies process, the output of filter and amplification unit connects the input of DSP control unit and the signal after input processing carries out signal judgement to DSP control unit, the output of DSP control unit connects collecting unit and driver element, DSP control unit is according to the sampling rate of input signal output order to collecting unit and driver element control break collecting unit, driver element connects the break-make of the main switch of pfc circuit the instruction control main switch according to DSP control unit.
2. the digitlization PFC acquisition control system based on DSP according to claim 1, it is characterized in that, filter and amplifying circuit is provided with in described amplifying unit, the clutter that the input that the input interface of filter connects collecting unit is used in filtering collection signal, the output interface of filter connects amplifying circuit and amplifying signal in input signal to amplifying circuit.
3. the digitlization PFC acquisition control system based on DSP according to claim 1, it is characterized in that, be provided with comparand register and reference voltage level in described DSP control unit, comparand register carries out data with reference to magnitude of voltage with the signal of input dsp controller and compares.
4. the digitlization PFC acquisition control system based on DSP according to claim 3, it is characterized in that, be provided with D/A converting circuit and threshold value in described DSP control unit, the signal of D/A converting circuit to input carries out digital-to-analogue conversion and the digital signal result of logarithmic mode conversion and threshold value compare judgement.
5. the digitlization PFC acquisition control system based on DSP according to claim 1, it is characterized in that, described pfc circuit comprises rectifier bridge, filtering booster circuit, main switch, current rectifying and wave filtering circuit and relay conversion circuit, voltage input bridge, booster circuit, main switch, current rectifying and wave filtering circuit, relay conversion circuit after filtering, exports the secondary circuit connecting relay conversion circuit to.
6., based on a digitlization PFC collection control method of DSP, it is characterized in that, described method step comprises:
Step one, gather PFC output voltage U by signal gathering unit
0signal value, the voltage signal of collection amplifies process after filtering, obtains output signal U m;
Step 2, Um inputed in corresponding DSP control unit comparand register, the reference voltage Ut of collection signal Um and the DSP setting in comparand register is contrasted, judges whether Um is more than or equal to Ut;
If step 3 Um is more than or equal to Ut, then DSP stops output signal, and DSP stops producing PWM ripple, and pfc circuit quits work;
If step 4 Um is less than Ut, then DSP control unit processes error information according to algorithm, and DSP control unit regulates sampling algorithm, changes sampling interval and sampling rate.
The error signal St of step 5, calculating signal value Um and reference voltage level Ut, whether error in judgement signal St is less than threshold value δ;
If step 6 error signal St is less than or equal to threshold value δ, then DSP control unit stops exporting, if error signal is greater than threshold value δ, then regulates modified model PI algorithm, changes the output signal of DSP, the sampling rate of conditioning signal collecting unit.
7. the digitlization PFC collection control method based on DSP according to claim 6, it is characterized in that, described method comprises digital collection method: carry out signals collecting by signal gathering unit to PFC output signal, device filtering clutter after filtering, again this signal is amplified, be input in DSP control unit, if Um is more than or equal to Ut, pfc circuit quits work; Otherwise if DSP control unit carries out digital-to-analogue conversion to sampled signal according to sampled value, obtains exact figure signal, and according to the sampling rate of sampling algorithm real-time control signal collecting unit and sampled point interval.
8. the digitlization PFC collection control method based on DSP according to claim 6, it is characterized in that, described method comprises digitalization control method: pre-set reference voltage Ut and threshold value δ according to actual needs, when DSP control unit obtains sampled signal Um, if | Ut-Um|≤δ, DSP stops producing drive singal, if | Ut-Um|> δ, reference voltage Ut in Um and comparand register is contrasted, obtain error signal St, according to the size of St, transfer function in amendment modified model PI algorithm, iterations and target final value are regulated and controled, change the drive singal duty ratio exporting driver element.
9. the digitlization PFC collection control method based on DSP according to claim 8, it is characterized in that, in described method, the formula of PI algorithm transfer function is:
in formula, k is proportionality coefficient, T
ifor the time of integration, the setting permissible value of δ system.
10. the digitlization PFC collection control method based on DSP according to claim 6, it is characterized in that, in described method step, digital signal is converted to analog drive signal by DSP control unit automatically, produce the PWM drive waveforms of a controllable duty ratio, through driver element process, be converted to signal main switch being opened or turns off, drive the running of main switch to control pfc circuit and export.
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Effective date of registration: 20230313 Address after: Floor 9, Lantian International Building, Lanshan District, Linyi City, Shandong Province, 276000 Patentee after: Shandong Global Network Technology Co.,Ltd. Address before: 241000 No. 1, Beijing East Road, Anhui, Wuhu Patentee before: ANHUI NORMAL University |