CN1059056A - A kind of controlling circuit of sine pulse duration modulation - Google Patents
A kind of controlling circuit of sine pulse duration modulation Download PDFInfo
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- CN1059056A CN1059056A CN 90107029 CN90107029A CN1059056A CN 1059056 A CN1059056 A CN 1059056A CN 90107029 CN90107029 CN 90107029 CN 90107029 A CN90107029 A CN 90107029A CN 1059056 A CN1059056 A CN 1059056A
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Abstract
" sinusoidal pulse width modulation (SPWM) control circuit " is the control signal generation circuit that is used for constant frequency and constant voltage output AC/DC converter.This circuit has stored one group of matched curve that calculates in advance in memory (EPROM).Export periodic matched curve group and the DC feedback control signal directly compares by memory, output sinusoidal pulse width modulation control signal.There is not the amplitude adjusted link of sinewave modulation signal and triangular wave carrier signal generation link and sinewave modulation signal in the prior art in the present invention.
Description
The present invention relates to the direct-current-alternating-current converter control technology of constant frequency and constant voltage output.
In the direct-current-alternating-current converter of constant frequency and constant voltage output, extensively adopt the sinusoidal pulse width modulation control technology, to suppress low-order harmonic content in the converter output voltage, reduce filter size, improve the converter dynamic response performance, and realize miniaturization, lightweight and the conversion high efficiency of converter.
Shown in Fig. 1-(a), U
△Be the triangular wave carrier signal, U
△The operating frequency of switch power element in the frequency decision converter.U
gBe sinewave modulation signal, U
gThe frequency of frequency decision converter output AC voltage.The switch power element is at U in the control change device
gWith U
△Joining changes operating state, thereby can obtain converter output voltage waveforms U shown in Fig. 1-(b)
0As seen from the figure, output voltage pulse spoke degree constant (equaling the converter input direct voltage), and pulse duration τ changes by sinusoidal rule in time.This output voltage fully near sinusoidal wave, is convenient to by alternating current filter filtering.Change sinewave modulation signal U
gAmplitude U
Gm, can change output voltage pulse duration τ, thereby realize the adjustment of converter output AC voltage value.
Prior art (one) is to utilize the analog circuit method to constitute controlling circuit of sine pulse duration modulation.As shown in Figure 2, circuit comprises: quartz oscillator 1, counter 2,3, sinewave modulation signal generator 4, triangular wave carrier signal generator 5, sinewave modulation signal amplitude controller 6 and comparator 7.The circuit structure complexity, less stable is a little less than the anti-external disturbance ability.
Prior art (two) is to utilize the digital circuit method to constitute controlling circuit of sine pulse duration modulation.As shown in Figure 3, circuit comprises: quartz oscillator 1, counter 2,3, sinewave modulation signal memory (EPROM) 8, triangular wave carrier signal storage (EPROM) 9, digital-to-analog converter 10,11, sinewave modulation signal amplitude controller 6 and comparator 7.Because this circuit is based on digital form work, operation stability is higher, and anti-external disturbance ability is stronger.But circuit structure is complicated more, bad adaptability.
According to aforesaid prior art, all comprise sinewave modulation signal and triangular wave carrier signal generation link (still comprising two digital-to-analog converter unit in the prior art (two)) and sinewave modulation signal amplitude controlling unit in its circuit.Above-mentioned three links are to cause the complicated and circuit operation stability main reasons for decrease of circuit structure.
Task of the present invention is direct-current-alternating-current converter digitlization sinusoidal pulse width modulation (SPWM) control circuit of a kind of constant frequency and constant voltage output of design, the amplitude adjusted link that no longer comprises sinewave modulation signal and triangular wave carrier signal generation link and sinewave modulation signal in this circuit, thereby the operation stability and the anti-external disturbance ability of raising circuit.
With reference to description of drawings the present invention program and concrete execution mode:
Fig. 1 is a sinusoidal pulse width modulation control principle key-drawing;
Fig. 2 is controlling circuit of sine pulse duration modulation prior art () block diagram;
Fig. 3 is controlling circuit of sine pulse duration modulation prior art (a two) block diagram;
Fig. 4 is a mentality of designing key-drawing of the present invention;
Fig. 5 is a block diagram of the present invention;
Fig. 6 is an electrical schematic diagram of the present invention;
Fig. 7 is that the present invention is at constant frequency and constant voltage power-supply system implementation figure.
Mentality of designing of the present invention is that the negative half period control signal can obtain with positive half cycle same procedure, so sinewave modulation signal U because the sinewave modulation signal positive-negative half-cycle has symmetric property
gPositive-negative half-cycle is got same signal, becomes waveform shown in Fig. 4-(a).In order to realize the constant frequency and constant voltage output of converter, sinewave modulation signal U
gAmplitude U
GmMust be adjustable within the specific limits.Suppose U
GmDetermined adjustable range is △ U
Gm, then to each U in this scope
g, warp and triangular wave carrier signal U
△Intersect, can obtain the some α that switch power element operating state changes in one group of control change device
1, α
2... α
nThese points can be at DC feedback control signal U among Fig. 4-(b)
RbEqual modulation ratio m(m and be defined as sinewave modulation signal U
gWith triangular wave carrier signal U
△The ratio of amplitude) obtain corresponding points on the value.For △ U among Fig. 4-(a)
GmEach U in the scope
gWith U
△Intersect, obtain all corresponding points among Fig. 4-(b).Promptly obtain one group of curve U of representing sinusoidal pulse width modulation control
A, shown in Fig. 4-(b).Like this, DC feedback control signal U
RbWith curve U
AIntersecting the converter switches power component operating state change point that obtains is and m=U
RbUnder the condition, U
gWith U
△It is identical to intersect resulting point.As U among Fig. 4-(c)
01Shown in.And U among Fig. 4-(b)
RbIn △ m scope, change the function that realized also with Fig. 4-(a) in U
gAt △ U
GmThe function unanimity that range realized.Therefore, according to mentality of designing of the present invention, as long as on circuit, form curve U
A, can realize sinusoidal pulse width modulation control easily.
Curve U
ABehind branches such as multiple spot on the time shaft, on circuit, store by memory (EPROM), obtain the curve U of match again through certain auxiliary circuit
AOutput.Matched curve U
ABe stored into memory (EPROM) before, must finishing it with Calculation Method in advance and ask for work, matched curve U
AComputational methods as follows:
With reference to accompanying drawing 4-(a), according to the sinusoidal pulse width modulation rule, to U
gIn the half cycle (0～180 ° of electric angle), carry out some five equilibriums at time shaft, it is identical with following memory (EPROM) number of addresses that five equilibrium is counted.Corresponding each Along ent is obtained triangular wave carrier signal U earlier
△Value on corresponding points.Again according to sinewave modulation signal U
gValue and U at this Along ent
△The value relation of equality, can obtain on this Along ent and U
△The U that intersects
gAmplitude.Then, by the U that tries to achieve
gAmplitude and U
△Amplitude is divided by, and obtains its ratio.When this ratio was in predetermined △ m scope, this ratio was exactly matched curve U
AIn the value of this Along ent, if this ratio when exceeding △ m scope, is then done following processing: when this ratio during greater than the predetermined higher limit of m institute, matched curve U
AThe value of putting 1 on this Along ent, and as this ratio during less than the predetermined lower limit of m institute, matched curve U
AThe value of putting 0 on this Along ent.To each Along ent on the time shaft, all finish aforementioned calculation work, can obtain matched curve U
AWave data, U among its waveform such as Fig. 4-(b)
AShown in.Time shaft data that aforementioned calculation is obtained and corresponding matched curve U
AData can be stored by memory (EPROM) after simple binary system is handled.
The matched curve U that obtains by the aforementioned calculation method
ABe used to realize sinusoidal pulse width modulation control, also have the following advantages:
(1) itself realizes the minimum and maximum working pulse width limitations of converter switches power component inherently, prevent the damage of switch power element.
(2) itself realize converter output voltage amplitude limit inherently.
(3) can be easily to matched curve U
ACarry out artificial correction, thereby the output voltage waveforms distortion that time-delay brings to converter switches power component switch realizes compensation, improves the waveform quality of output voltage.
(4), thereby there is not the converter output voltage waveforms distortion that is caused because of control circuit asymmetric work in positive-negative half-cycle in the prior art owing to control signal realizes by same circuit in positive-negative half-cycle.
Aforementioned calculation work can be finished by digital computer through writing special-purpose software.
The main contents of organization plan of the present invention as shown in Figure 5, this sinusoidal pulse width modulation (SPWM) control circuit comprises: quartz oscillator 1, binary counter 2, memory (EPROM) 12, digital-to-analog converter 10 and comparator 7 totally five parts are formed.
Be sinusoidal pulse width modulation of the present invention (SPWM) control circuit electrical schematic diagram as shown in Figure 6, by quartz oscillator 1(C
Ry) constitute clock generating circuit and (comprise inverter F
1, F
2) guarantee the high stability of converter output voltage frequency.Binary counter 2(IC
1) cycle count produces periodically the address directly to memory (EPROM) 12(IC
2) look for memory IC
2Be placed in the state of reading.Through periodically looking for memory IC
2The matched curve U that sends
AData have periodic property.These data totally 8 be sent to digital-to-analog converter 10(IC
3) data input pin, (comprise amplifier A through digital-analog conversion
1, A
2) after, by A
2Output obtains matched curve U
AWaveform output, U
AWaveform signal is sent to comparator 7(A
3) first (anti-phase) input, simultaneously, DC feedback control signal U
RbBe sent to comparator A
3Second (homophase) input, comparator A
3Two signals that receive are compared output sinusoidal pulse width modulation control signal U
01
In the electrical schematic diagram shown in Figure 6, counter IC
1Also export a square-wave signal U identical with the converter output voltage frequency
0S, U
0SWhen being used for the invention process, signal carries out positive-negative half-cycle phase-splitting control.
Amplifier A
1Be to be used for digital-to-analog converter IC
3The circuit signal of output is transformed into voltage signal.Amplifier A
2By designing among the figure, can realize that the sensitivity of sinusoidal pulse width modulation control is regulated and level and smooth matched curve U
AWaveform.The latter can suppress matched curve u
AQuantization error and memory IC
2Individual data is write the error that read error causes, to guarantee the precision of sinusoidal pulse width modulation control.
By as seen above-mentioned, no longer contain the sinewave modulation signal in the prior art and the amplitude adjusted link of triangular wave carrier signal generation link and sinewave modulation signal in sinusoidal pulse width modulation of the present invention (SPWM) control circuit, and circuit is based on digital form work, therefore, circuit structure is the simplest, good operation stability, the reliability height, anti-external disturbance ability is strong.
With reference to Fig. 7 the execution mode of the present invention in the constant frequency and constant voltage power-supply system is described.The power circuit of constant frequency and constant voltage power-supply system is by A.C.-D.C. converter 13, DC filter 14, and constant frequency and constant voltage output direct-current-alternating-current converter 15, alternating current filter 16 and output isolation transformer 17 are formed.When utilizing the present invention to constitute the closed-loop control system of constant frequency and constant voltage output direct-current-alternating-current converter 15, must dispose output voltage feedback signal rectification circuit 18, error signal amplification circuit 19,20 3 basic links of logic synthesis and control signal amplifying circuit.Rectification circuit 18 converts feedback signal to direct current signal, this direct current signal and given signal U
Ref, relatively obtain error signal U
e, U
eObtain DC feedback control signal U through the amplification of error signal amplification circuit 19 integrations
Rb, U
RbAfter being sent to key point of the present invention and being controlling circuit of sine pulse duration modulation (SPWM), obtain corresponding sinusoidal pulse width modulation control signal output U
01With phase-splitting control signal U
OS, U
01, U
0SWaveform is respectively shown in Fig. 4-(c), (d), by U
01, U
0SSignal is the work of control direct-current-alternating-current converter after circuit 20 logic synthesiss and signal amplification, and the converter output amplitude equals it and goes into to hold direct voltage, the voltage U that pulse duration changes by sinusoidal rule in time
02, U
02Through simple alternating current filter 16 filtering, and by the sine wave AC voltage U that exports constant frequency and constant voltage after the output isolation transformer 17 isolation transformations
0, U
02, U
0Waveform is shown in Fig. 4-(e).
The present invention is applicable to the sinusoidal pulse width modulation control of constant frequency and constant voltage output direct-current-alternating-current converter, under the condition that does not change circuit structure, be stored in the memory (EPROM) as long as correspondingly calculate relevant matched curve, can realize other pulse width modulation controlled of constant frequency and constant voltage output direct-current-alternating-current converter, therefore, adaptive capacity is strong.The present invention also can be used for constituting the pulse width modulation controlled of other direct-current-alternating-current converter.
Claims (3)
1, controlling circuit of sine pulse duration modulation, comprise quartz oscillator, counter, sinewave modulation signal generator, triangular wave carrier signal generator and comparator, it is characterized in that constituting clock generating circuit by quartz oscillator [1], producing the periodicity address by a binary counter [2] cycle count directly looks for memory [12], this memory is placed in the state of reading, and it periodically sends the one group of matched curve U that stores in advance with 8 figure places
AData are to digital-to-analog converter [10], and digital-to-analog converter [10] is sent periodically matched curve group U
AWaveform is to the first input end of comparator [7], simultaneously, and DC feedback control signal U
RbDeliver to second input of comparator [7], comparator [7] is promptly exported sinusoidal pulse width modulation (SPWM) control signal after two signals that receive are compared.
2, control circuit according to claim 1 is characterized in that in the memory (12) one group of matched curve storing in advance, is according to sinusoidal pulse width modulation (SPWM) rule, and the situation of change of 0～180 ° of electric angle (half cycle) is calculated matched curve U
AWave data, with time shaft data and corresponding U
AData are stored in the memory (EPROM) after simple binary system (8) is handled.
3, control circuit according to claim 1 and 2, must configuration output voltage feedback signal rectification circuit (18), error signal amplification circuit (19) when it is characterized in that implementing, logic is combined and and (20) three basic links of control signal amplifying circuit, through rectification circuit (18) feedback signal convert to direct current signal and with given signal U
RefRelatively obtain error signal U
e, U
eObtain DC feedback control signal U through the amplification of error amplifying circuit (19) integration
Rb, again it is sent into controlling circuit of sine pulse duration modulation of the present invention (SPWM), export corresponding sinusoidal pulse width modulation control signal U
01, U
01The work of control direct-current-alternating-current converter makes the converter output voltage amplitude equal it and goes into to hold dc voltage value, the voltage U that pulse duration changes by sinusoidal rule in time after circuit (20) logic synthesis and signal amplification
02, U
02Through alternating current filter (16) filtering, and, promptly export the sine wave AC voltage U of constant frequency and constant voltage by after output isolation transformer (17) the isolation transformation
0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90107029 CN1022154C (en) | 1990-08-15 | 1990-08-15 | Controlling circuit of sine pulse duration modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90107029 CN1022154C (en) | 1990-08-15 | 1990-08-15 | Controlling circuit of sine pulse duration modulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1059056A true CN1059056A (en) | 1992-02-26 |
| CN1022154C CN1022154C (en) | 1993-09-15 |
Family
ID=4880377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90107029 Expired - Fee Related CN1022154C (en) | 1990-08-15 | 1990-08-15 | Controlling circuit of sine pulse duration modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022154C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062694C (en) * | 1993-04-30 | 2001-02-28 | 东芝株式会社 | Pulse modulated circuit |
| CN107239052A (en) * | 2017-05-23 | 2017-10-10 | 中国电子科技集团公司第四十研究所 | A kind of triggering level automatic calibrating method realized based on FPGA |
| CN107388990A (en) * | 2017-07-19 | 2017-11-24 | 天津科技大学 | Laser grating striped projection system based on multifacet rotating prism |
| CN113131756A (en) * | 2021-05-06 | 2021-07-16 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411293C (en) * | 2004-12-30 | 2008-08-13 | 山东大学 | Parabola method current tracking pulse width modulation controller |
| CN100367647C (en) * | 2005-07-22 | 2008-02-06 | 清华大学 | Universal pulse width modulation integrated circuit for power electric current transormer |
-
1990
- 1990-08-15 CN CN 90107029 patent/CN1022154C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062694C (en) * | 1993-04-30 | 2001-02-28 | 东芝株式会社 | Pulse modulated circuit |
| CN107239052A (en) * | 2017-05-23 | 2017-10-10 | 中国电子科技集团公司第四十研究所 | A kind of triggering level automatic calibrating method realized based on FPGA |
| CN107239052B (en) * | 2017-05-23 | 2019-09-24 | 中国电子科技集团公司第四十一研究所 | A kind of triggering level automatic calibrating method realized based on FPGA |
| CN107388990A (en) * | 2017-07-19 | 2017-11-24 | 天津科技大学 | Laser grating striped projection system based on multifacet rotating prism |
| CN107388990B (en) * | 2017-07-19 | 2019-07-23 | 天津科技大学 | Laser grating striped projection system based on multifacet rotating prism |
| CN113131756A (en) * | 2021-05-06 | 2021-07-16 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
| CN113131756B (en) * | 2021-05-06 | 2022-09-02 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1022154C (en) | 1993-09-15 |
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