CN201312267Y - Single-pole SPWM inverter power-source circuit - Google Patents
Single-pole SPWM inverter power-source circuit Download PDFInfo
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- CN201312267Y CN201312267Y CNU2008201462101U CN200820146210U CN201312267Y CN 201312267 Y CN201312267 Y CN 201312267Y CN U2008201462101 U CNU2008201462101 U CN U2008201462101U CN 200820146210 U CN200820146210 U CN 200820146210U CN 201312267 Y CN201312267 Y CN 201312267Y
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Abstract
The utility model relates to an inverter power-source circuit in the electricity filed, in particular to a single-pole SPWM inverter power-source circuit, which comprises a master control loop, a reference sine-wave circuit, a waveform comparison follower circuit, a SPWM driving control circuit, a voltage booster circuit, a rectification filter circuit and a sine reverse circuit. The master control loop sends sine-based digital discrete signals, the reference sine-wave circuit converts the digital concrete signals into standard reference sine-wave, the waveform comparison follower circuit controls and outputs SPWM voltage boosting drive signals on the basis of differential signals fed back after comparing the reference sine-wave waveform and the inverted output waveform, the SPWM driving control circuit sends differential pulse drive signals to a power tube driving circuit of the voltage booster circuit, the voltage booster circuit boosts voltage of inputted sine signals, the rectification filter circuit rectifies the sine signals output by the voltage booster circuit and filters high spectral harmonic wave component inside, the sine reverse circuit outputs complete sine wave after reversing the sine signals in negative semi-cycle. The utility model has the advantages of easy control, fast response, high conversion efficiency and the like.
Description
Technical field
The utility model relates to the inverter power circuit of electricity field, especially relates to single-stage SPWM inverter power circuit.
Background technology
In the inverter field, SPWM (Sinusoidal PWM) method is a kind of technology of comparative maturity.The SPWM method is exactly to change by sinusoidal rule with pulse duration and the PWM waveform of sinusoidal wave equivalence is the break-make of switching device in the SPWM waveform control of inverter circuit, the area of the pulse voltage of its output is equated, by changing modulation wave frequency and the amplitude then frequency and the amplitude of scalable inverter circuit output voltage with the area of sine wave in respective bins of desired output.
Traditional inverter generally adopts bipolar system SPWM mode, promptly adopts one-level PWM mode that direct voltage is boosted to direct current about 380-400V, and then adopts one-level SPWM mode, the 380V-400V direct current is cut into 220V exchange output.The advantage of bipolar SWPM technology is that each utmost point PWM is an independent loop, and control is succinct, realizes easily.But two-way PWM combines, whole inversion process control complexity, feedback response is slower, need to regulate the dynamic equilibrium in each loop, the complete machine dynamic response is not good, the fault point is many, and two-stage PWM conversion causes the complete machine conversion efficiency low, is difficult to realize higher inversion conversion efficiency on electrical principle.
The utility model content
For addressing the above problem, the utility model is based on the shortcoming of present bipolar SPWM pattern, utilizes single-stage SPWM technology realize boosting/the be shaped as inverter mode of one innovatively.Specifically, the manner is to adopt the SPWM technology, and DC boosting and waveform shaping are united two into one, in SPWM process, realize boosting/all processes of the inverter of shaping, thereby it is succinct to reach control, response is rapid, unique technique advantages such as conversion efficiency height.
The utility model adopts following technical scheme:
Single-stage SPWM inverter power circuit of the present utility model comprises:
Main control loop sends the Digital Discrete signal based on sine, and output is connected in the baseline sinusoidal wave circuit;
The baseline sinusoidal wave circuit changes into the standard basis sine wave with described Digital Discrete signal digital-to-analogue, and input is connected in main control loop, and output is connected in relatively follow circuit of waveform;
Waveform is follow circuit relatively, based on the differential signal that baseline sinusoidal wave waveform and inversion output waveform are relatively fed back, and control output SPWM boost drive signals, input is connected in the baseline sinusoidal wave circuit, and output is connected in the SPWM Drive and Control Circuit;
The SPWM Drive and Control Circuit is delivered to the differential pulse drive signal on the power tube drive circuit of booster circuit, and input is connected in relatively follow circuit of waveform, and output is connected in booster circuit;
Booster circuit, with the sinusoidal signal boost in voltage of input, input is connected in the SPWM Drive and Control Circuit, and output is connected in current rectifying and wave filtering circuit;
Current rectifying and wave filtering circuit, the sinusoidal signal and the wherein high spectrum harmonic components of filtering of rectification boosting circuit output, input is connected in booster circuit, and output is connected in sinusoidal reverse circuit;
Sinusoidal reverse circuit after the upset of sine wave signal negative half period, is exported complete sine wave, and input is connected in current rectifying and wave filtering circuit.
Further, described main control loop comprises at least: the master control dsp chip, and logical process and to SPWM Waveform Control and peripheral circuit detecting control is connected in auxiliary MCU; Auxiliary MCU sampling direct current signal and control peripheral circuit and control show; Phase-locked loop, phase-locked digital signal computing.
Further, described main control loop also comprises: display module, Pulse by Pulse protective circuit, overload protecting circuit, anti-electromagnetic interference module all are connected on described master control dsp chip and the auxiliary MCU.
Further, described baseline sinusoidal wave circuit comprises at least: the step low-pass detecting circuit of series connection and sinusoidal wave rectification circuit, described step low-pass detecting circuit leaches the sine wave of simulation, be rectified into the DC simulation sine wave via described sinusoidal wave rectification circuit again, the output reference sine wave.
Further, described waveform comparison follow circuit comprises: compare follow circuit, receive baseline sinusoidal wave signal and inversion output waveform signals, relatively export the PWM administration module to; PWM administration module input also is connected in current feedback and adjusts circuit.
Further, described booster circuit is the push-pull type booster circuit.
Further, described push-pull type booster circuit is applied to below the power output 1500VA.Further, described booster circuit is the full-bridge type booster circuit.
Further, described full-bridge type booster circuit is applied to more than the power output 2000VA.
The technical solution of the utility model adopts the SPWM technology, DC boosting and waveform shaping is united two into one, in SPWM process, realization boosts/all processes of the inverter of shaping, thereby it is succinct to reach control, and response is rapid, unique technique advantages such as conversion efficiency height.
Description of drawings
Fig. 1 is a main circuit schematic diagram of the present utility model;
Fig. 2 is a main control loop schematic diagram of the present utility model;
Fig. 3 is baseline sinusoidal wave circuit theory diagrams of the present utility model;
Fig. 4 is a relatively follow circuit schematic diagram of waveform of the present utility model;
Fig. 5 is a SPWM Drive and Control Circuit schematic diagram of the present utility model;
Fig. 6 is a full-bridge type booster circuit schematic diagram of the present utility model;
Fig. 7 is a push-pull type booster circuit schematic diagram of the present utility model;
Fig. 8 is a current rectifying and wave filtering circuit schematic diagram of the present utility model;
Fig. 9 is a sinusoidal reverse circuit schematic diagram of the present utility model.
Embodiment
Existing accompanying drawings and embodiment further specify the utility model.
The utility model just is based on the shortcoming of at present popular bipolar SPWM pattern, utilizes single-stage SPWM technology realize boosting/the be shaped as inverter mode of one innovatively.Specifically, the manner is to adopt the SPWM technology, and DC boosting and waveform shaping are united two into one, in SPWM process, realize boosting/all processes of the inverter of shaping, thereby it is succinct to reach control, response is rapid, unique technique advantages such as conversion efficiency height.
On technology realized, the hardware topology framework that we adopt full-bridge or recommend specifically was divided into main circuit and drive part.Main circuit generally is made up of high performance MOSFET, and circuit simply is easy to realize.Drive part is the core of our single-stage SPWM pattern, and we at first adopt digital form to produce a pure adjustable sine wave, and we are its reference sine wave, and this is the reference basis of our output waveform.Why using digital form, is amplitude and the wavy curve of being convenient to adjust and control this reference sine wave.After obtaining reference sine wave, the mode that we use comparison follow circuit and pwm pulse control circuit to combine, with the differential input of the sample circuit of output waveform and the reference sine wave result after relatively as the pwm pulse control circuit, the output of control SPWM pulsewidth, thus reach boosting and shaping of control inverter sine wave.
In order to reach better conversion efficiency and dynamic characteristic, we generally adopt the above SPWM frequency of 100K, behind the secondary process bridge rectifier of full-bridge or push-pull type main circuit, what we obtained is the direct current sine wave that contains more high order harmonic component, after the suitable LC filtering of process, can obtain high-quality direct current pure sine wave, obtain exchanging pure sine wave by the output of power frequency reverse circuit again.
Owing to adopt the single-stage mode, can be at an easy rate recommending or electrical isolation is realized in the both sides of full-bridge topology, can realize the complete electrical isolation of DC side and AC side like this, handle and needn't make extra electrical isolation, use for inversion now, emphasize more and more and pay attention to that for the electrical isolation of DC side and AC side single-stage SPWM technology has inborn advantage to this.
We can also be by switching frequency that improves complete machine SPWM and the mode of using soft switch, improve the conversion efficiency of single-stage SPWM, under the prerequisite of using existing possibility technology, the inversion conversion efficiency of single-stage SPWM technology can reach 95%-97%, for the power conversions technology of this control complexity of inversion, this has almost reached the conversion limit, and for the conversion efficiency of average 82%-85% under the bipolar SPWM technology, this will be tantamount to is a leap.
The main circuit structure explanation
As shown in Figure 1, the main circuit structure of single-stage SPWM pattern of the present utility model is made up of several sections such as main control loop 1 (master control chip loop), baseline sinusoidal wave circuit 2, waveform comparison follow circuit and SPWM Drive and Control Circuit 3, booster circuit 4, rectification circuit 51, filter circuit 52, sinusoidal reverse circuits 6.Its basic functional principle is as follows:
Step1. send Digital Discrete signal by the CPU of main control loop 1, change into the standard basis sine wave by baseline sinusoidal wave circuit 2 digital-to-analogues based on sine wave.
Step2. follow by waveform and differential signal control output SPWM boost drive signals that SPWM control loop 3 relatively feeds back based on baseline sinusoidal wave waveform and inversion output waveform.
Step3. under the control of SPWM boost drive signals, booster circuit 4 also produces sinusoidal waveform with DC boosting simultaneously to 320V BUS voltage.
Step4. behind the sinusoidal wave rectifying and wave-filtering after will boosting, the clean pure sine DC steamed bun ripple of output.
Step5. with the sine DC waveform after the upset of the power frequency inverter current of 50/60Hz, obtain the pure sinusoid AC wave shape.
Core of the present utility model is the generation of baseline sinusoidal wave shape and waveform is relatively followed and part such as SPWM control circuit.
The working cell is introduced
1. main control loop (master control chip loop)
Main control chip is the core data processing unit of inverter, and it adopts high performance MCU or the DSP cellular logic of finishing the work to handle, the SPWM Waveform Control, and peripheral circuit detecting and control, protection and communicating circuit are controlled or the like.As shown in Figure 2, be based on the novel inverter control section logic diagram of single-stage SPWM technology.Can see that we have adopted the two poles of the earth control unit, promptly auxiliary MCU12 and master control DSP11.Auxiliary MCU12 is used as DC side signal sampling and peripheral circuit control and basic display control.Master control DSP11 is mainly as complicated SPWM control unit, output waveform FEEDBACK CONTROL and phase-locked digital signal computing and real-time guard control etc.
2.SPWM baseline sinusoidal wave generates
Baseline sinusoidal wave is the basis of inverter SPWM output control.Determined the waveform of sine wave output just by baseline sinusoidal wave, auxiliary, all details such as frequency.So the generation of baseline sinusoidal wave and maintenance are one of cores of single-stage SPWM technology.
Shown in Figure 3 is that baseline sinusoidal wave produces schematic circuit, at first by main control unit with the standard sine wave discrete digitalization, output comprises the digital signal of SPWM shape information then, leach the sine wave of simulation by the step low-pass detecting circuit of baseline sinusoidal wave, being rectified into the DC simulation sine wave, promptly produced baseline sinusoidal wave.
Because baseline sinusoidal wave is that control unit can change the output of adjusting the SPWM digital signal according to the inversion circuit that detects by the discrete digital signal generation of control unit output, adjusts baseline sinusoidal wave so that influence the purpose of loop wave form varies thereby reach.
3. sine waveform is relatively followed
After producing baseline sinusoidal wave, we need make comparisons output inversion waveform and baseline sinusoidal wave actual on the loop, produce differential signal control SPWM driving pulse then, produce corresponding sinusoidal waveform thereby drive booster circuit.This circuit also is one of core circuit of single-stage SPWM technology.
Fig. 4 is exactly a relatively follow circuit 31 of sinusoidal waveform.Described waveform comparison follow circuit 31 comprises: compare follow circuit 311, receive baseline sinusoidal wave signal and inversion output waveform signals, relatively export PWM administration module 312 to; PWM administration module 312 inputs also are connected in current feedback and adjust circuit 313.Change into the SPWM driving pulse after the comparison difference of output waveform on circuit baseline sinusoidal wave that control unit is produced and the inversion circuit thus, the control booster circuit produces and adjusts waveform.When output load or unload or impact generation wave form varies, the loop feeds back to main control unit with this variation immediately, feed back to sinusoidal wave relatively follow circuit simultaneously, when main control unit is adjusted baseline sinusoidal wave, sinusoidal wave comparison follow circuit is with this wave form varies and relatively back frequency and the pulsewidth of adjusting the SPWM driving pulse of baseline sinusoidal wave, thereby reach the inversion waveform of adjusting the loop output of boosting, form the complete dynamic response of waveform fast.
4.SPWM drive controlling
After sine wave compares follow circuit generation difference SPWM control impuls, must this differential pulse drive signal be delivered on the power tube drive circuit of booster circuit by the SPWM Drive and Control Circuit.
Be basic Drive and Control Circuit as shown in Figure 5, because the selection of the major loop that boosts, we may need the SPWM signal decomposition is become two-way or four tunnel drive signals, could correctly drive the power tube on the loop of boosting.When promptly selecting push-pull mode, need resolve into the two-way drive signal in the main loop of boosting.If full-bridge mode is selected in the main loop of boosting, need drive circuit to export four tunnel drive signals.Since the DC driven side might and SPWM control side not at same benchmark, so the overwhelming majority time, also need SPWM drive controlling loop to make the isolation drive pattern.
5.SPWM the booster circuit topology is selected
Single-stage SPWM booster circuit is the main loop of power circuit of single-stage SPWM technology inversion part.It is generally recommended and two kinds of patterns of full-bridge, as shown in Figure 6 and Figure 7.
The general inverter of power output below 1500VA, we can select the main circuit that boosts of push-pull mode as shown in Figure 7, can obtain reasonable cost performance.And in the inverter more than 2000VA, because the dynamic stability of high-power system requires and the selection of power device, generally we adopt full-bridge boost circuit as shown in Figure 6 can obtain very good effect.
No matter push-pull mode or boost mode, basic operation principle all is consistent.Promptly after the SPWM pulse of receiving sinusoidal wave difference follow circuit generation, booster circuit promptly drives recommends or the full bridge power pipe, produces SPWM high-frequency impulse loop, in the secondary output waveform that comprises complete sinusoidal information that is coupled out of transformer.
6. rectifying and wave-filtering
Sinusoidal waveform in the secondary generation of the loop main transformer that boosts has comprised a large amount of high-frequency harmonics, and we need select suitable LC filter circuit to do filtering.Based on the needs of LC filtering, we select the LC filter circuit filtering of suitable parameters then earlier with this sinusoidal waveform rectification, can produce pure clean direct current sinusoidal waveform.
Basic current rectifying and wave filtering circuit as shown in Figure 8, we can see that the waveform of the sinusoidal waveform of a large amount of envelope high-frequency harmonic compositions of booster circuit output after LC filtering output has been pure clean standard direct current sinusoidal waveform.This is the known technology circuit, repeats no more in this.
7. the sinusoidal upset of power frequency
Shown in Figure 9, behind the standard direct current sine wave of LC filtering output, what we needed is exactly the inversion reverse circuit of a simple power frequency 50Hz or 60Hz, after the upset of sinusoidal waveform negative half period, can obtain complete interchange pure sine wave output.This is the known technology circuit, repeats no more in this.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.
Claims (7)
1. single-stage SPWM inverter power circuit, it is characterized in that: it comprises
Main control loop (1) sends the Digital Discrete signal based on sine, and output is connected in baseline sinusoidal wave circuit (2);
Baseline sinusoidal wave circuit (2) changes into the standard basis sine wave with described Digital Discrete signal digital-to-analogue, and input is connected in main control loop (1), and output is connected in relatively follow circuit (31) of waveform;
Waveform is follow circuit (31) relatively, the differential signal that relatively feeds back based on baseline sinusoidal wave waveform and inversion output waveform, control output SPWM boost drive signals, input is connected in baseline sinusoidal wave circuit (2), and output is connected in SPWM Drive and Control Circuit (32);
SPWM Drive and Control Circuit (32) is delivered to the differential pulse drive signal on the power tube drive circuit of booster circuit, and input is connected in relatively follow circuit (31) of waveform, and output is connected in booster circuit (4);
Booster circuit (4), with the sinusoidal signal boost in voltage of input, input is connected in SPWM Drive and Control Circuit (32), and output is connected in current rectifying and wave filtering circuit (51,52);
Current rectifying and wave filtering circuit (51,52), the sinusoidal signal and the wherein high spectrum harmonic components of filtering of rectification boosting circuit output, input is connected in booster circuit (4), and output is connected in sinusoidal reverse circuit (6);
Sinusoidal reverse circuit (6) after the upset of sine wave signal negative half period, is exported complete sine wave, and input is connected in current rectifying and wave filtering circuit (51,52).
2. single-stage SPWM inverter power circuit as claimed in claim 1, it is characterized in that: described main control loop (1) comprises at least: master control dsp chip (11), logical process and to SPWM Waveform Control (17) and peripheral circuit detecting control is connected in auxiliary MCU (12); Auxiliary MCU (12) sampling direct current signal and control peripheral circuit and control show; Phase-locked loop (18), phase-locked digital signal computing.
3. single-stage SPWM inverter power circuit as claimed in claim 2; it is characterized in that: described main control loop (1) also comprises: display module (13), Pulse by Pulse protective circuit (14), overload protecting circuit (15), anti-electromagnetic interference module (16) all are connected on described master control dsp chip (11) and the auxiliary MCU (12).
4. single-stage SPWM inverter power circuit as claimed in claim 1 is characterized in that: described baseline sinusoidal wave circuit (2) comprises at least: the step low-pass detecting circuit of series connection and sinusoidal wave rectification circuit.
5. single-stage SPWM inverter power circuit as claimed in claim 1, it is characterized in that: described waveform relatively follow circuit (31) comprises: compare follow circuit (311), receive baseline sinusoidal wave signal and inversion output waveform signals, relatively export PWM administration module (312) to; PWM administration module (312) input also is connected in current feedback and adjusts circuit (313).
6. single-stage SPWM inverter power circuit as claimed in claim 1 is characterized in that: described booster circuit (4) is the push-pull type booster circuit.
7. single-stage SPWM inverter power circuit as claimed in claim 1 is characterized in that: described booster circuit (4) is the full-bridge type booster circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201462101U CN201312267Y (en) | 2008-10-31 | 2008-10-31 | Single-pole SPWM inverter power-source circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201462101U CN201312267Y (en) | 2008-10-31 | 2008-10-31 | Single-pole SPWM inverter power-source circuit |
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| CN201312267Y true CN201312267Y (en) | 2009-09-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101667790B (en) * | 2009-09-25 | 2011-05-25 | 浙江工贸职业技术学院 | High power DA conversion circuit |
| CN103595376A (en) * | 2012-08-13 | 2014-02-19 | 快捷韩国半导体有限公司 | Piezoelectric driving circuit and driving method thereof |
| CN104081649A (en) * | 2011-11-16 | 2014-10-01 | Abb技术有限公司 | AC/DC multicell power converter for dual terminal hvdc connection |
| US8879291B2 (en) | 2009-02-09 | 2014-11-04 | Alstom Technology Ltd. | Multilevel voltage source converter |
| CN105981286A (en) * | 2013-10-07 | 2016-09-28 | 通用电气技术有限公司 | Voltage source converter |
| CN106505870A (en) * | 2016-11-25 | 2017-03-15 | 广东百事泰电子商务股份有限公司 | A kind of long-life intelligently voltage boosting conversion equipment |
| CN108400714A (en) * | 2018-01-30 | 2018-08-14 | 安徽省金屹电源科技有限公司 | A kind of vehicle-mounted plasma air purifier power source special |
| CN112564484A (en) * | 2020-11-05 | 2021-03-26 | 北京全路通信信号研究设计院集团有限公司 | High-safety remote emergency switch device based on Internet of things technology and data processing method |
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2008
- 2008-10-31 CN CNU2008201462101U patent/CN201312267Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8879291B2 (en) | 2009-02-09 | 2014-11-04 | Alstom Technology Ltd. | Multilevel voltage source converter |
| CN102334274B (en) * | 2009-02-09 | 2014-12-03 | 阿尔斯通技术有限公司 | Converter |
| CN101667790B (en) * | 2009-09-25 | 2011-05-25 | 浙江工贸职业技术学院 | High power DA conversion circuit |
| CN104081649A (en) * | 2011-11-16 | 2014-10-01 | Abb技术有限公司 | AC/DC multicell power converter for dual terminal hvdc connection |
| CN103595376A (en) * | 2012-08-13 | 2014-02-19 | 快捷韩国半导体有限公司 | Piezoelectric driving circuit and driving method thereof |
| CN103595376B (en) * | 2012-08-13 | 2017-06-23 | 快捷韩国半导体有限公司 | Piezoelectric driving circuit and its driving method |
| CN105981286A (en) * | 2013-10-07 | 2016-09-28 | 通用电气技术有限公司 | Voltage source converter |
| CN105981286B (en) * | 2013-10-07 | 2018-06-22 | 通用电气技术有限公司 | Voltage source type converter |
| CN106505870A (en) * | 2016-11-25 | 2017-03-15 | 广东百事泰电子商务股份有限公司 | A kind of long-life intelligently voltage boosting conversion equipment |
| CN108400714A (en) * | 2018-01-30 | 2018-08-14 | 安徽省金屹电源科技有限公司 | A kind of vehicle-mounted plasma air purifier power source special |
| CN112564484A (en) * | 2020-11-05 | 2021-03-26 | 北京全路通信信号研究设计院集团有限公司 | High-safety remote emergency switch device based on Internet of things technology and data processing method |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090916 Termination date: 20111031 |