CN102545679A - High-efficiency inverter and inversion method thereof - Google Patents
High-efficiency inverter and inversion method thereof Download PDFInfo
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Abstract
The invention discloses a high-efficiency inverter and an inversion method. The inverter comprises a direct current power supply, a step-up converter, a direct current-alternating current inversion device, an auxiliary power supply, a first central processing unit (CPU), a second CPU and an alternating current detection circuit. According to the inversion method, a sinusoidal pulse width modulation (SPWM) technology is utilized, and the CPUs are used for performing digital regulation and control to achieve a good voltage stabilization effect on alternating current output. According to the inverter and the inversion method, the SPWM frequency of a generated sinusoidal wave can reach higher than 100KHZ, and the sinusoidal wave has low output harmonics and stable output frequency, so that the whole high-efficiency inverter is a clean power supply.
Description
Technical field
The present invention relates to inverter and inverse method.
Background technology
Inverter is a kind of device that direct current is converted into alternating current, belongs to the mobile model supply unit.Now, in order to stablize ac output voltage, the application of DC-to-AC converter more and more widely.When using DC-to-AC converter,, adopt the mode of voltage waveform feedback to carry out voltage control usually for regulated output voltage, as a kind of DC-to-AC converter that occurred; It has adopted PWM technology, and the waveform of output voltage is fed back in the pulse width modulation circuit of output pwm signal, wherein; The feed back control system of output waveform still, utilizes analog circuit with Realization of Analog Circuit; The number of its component parts is many, and therefore, the deviation of the output voltage that the deviation of each parts causes is big; Final output voltage is also unstable, in addition, and in order to obtain analog signal; Need seal in a resistance, this resistance will consume portion of energy and form reactive power, has caused the loss of energy.
Based on above-mentioned defective; People improve above-mentioned DC-to-AC converter, and as being that 2002.9.3 discloses a kind of DC-to-AC converter in the patent documentation of 2003.4.2 to comprise converter, inverter, low pass filter, voltage detection unit, voltage waveform detecting unit, SCR drive circuit, FET drive circuit and CPU for the 1407714A applying date at publication number, converter is used to export high direct voltage; Inverter is used for converting high direct voltage into interchange and input low pass filter; By low pass filter output sinusoidal ac, this DC-to-AC converter detects the converter output voltage through voltage detection unit when work; And voltage detection signal is input among the CPU; The thyristor angle of flow through in the CPU control SCR drive circuit control change device makes that the voltage of converter output is a predetermined value, meanwhile; The voltage waveform detecting unit feeds back to CPU with the voltage waveform of inverter output end; Calculating through CPU is passed to instruction in the FET drive circuit, controls and change the pulsewidth of PWM through the FET drive circuit, thereby reaches the purpose of voltage stabilizing.Can be known that by above-mentioned structure and principle the output of converter remains a preset definite value, that is: high direct voltage is stable; The convertor device of this structure is realized voltage stabilizing through changing the PWM pulsewidth, and its detailed process is that CPU carries out pointwise to the voltage waveform of gathering and calculates; And result of calculation handled, contrasts, according to handle, the result of contrast controls inverter through FET, and is as depicted in figs. 1 and 2; The PWM pulsewidth is changed, in this process, because the processing speed of CPU and limited in one's ability; And CPU need carry out pointwise and calculates to the voltage waveform of gathering, and therefore, collects the phenomenon that control PWM pulsewidth changes and can time of occurrence lags behind from voltage waveform; And the computational accuracy of CPU also is difficult to assurance, thereby causes the weak effect of voltage stabilizing, and the error of appearance will reach positive and negative 10%.
Summary of the invention
The purpose of this invention is to provide a kind of high efficiency inverter, technical problem to be solved is that the voltage regulation result of inverter is poor, and sinusoidal wave output harmonic wave is big, and sinusoidal wave output frequency is unstable.
Another object of the present invention provides a kind of inverse method of high efficiency inverter, and technical problem to be solved is that the voltage regulation result of inverter is poor, and sinusoidal wave output harmonic wave is big, and sinusoidal wave output frequency is unstable.
For achieving the above object; A kind of high efficiency inverter comprises DC power supply, booster converter, dc inversion ac equipment; DC power supply is input to the output high direct voltage of boosting in the booster converter with dc low-voltage; High direct voltage forms pulse through the dc inversion ac equipment through the SPWM technology, in the dc inversion ac equipment, exports to exchange; Be connected with CPU1 through metal-oxide-semiconductor or IGBT drive circuit on the booster converter; Be connected with CPU2 on the dc inversion ac equipment, the mutual communication of CPU1 and CPU2; Be connected with AC detection circuit between CPU1 and the ac output end; In the dc inversion ac equipment, be solidified with fixing SPWM pulsewidth function.
In such scheme; Through the sine wave of the continual detection of CPU2 by the generation of dc inversion ac equipment; And the position of sine wave told to CPU1; CPU1 gathers the voltage signal of ac output end at the crest time point of sine wave through AC detection circuit, and in CPU1, converts voltage signal into digital signal, regulates the voltage swing of booster converter output through metal-oxide-semiconductor or IGBT drive circuit through the numeral regulation and control; Through changing the amplitude that high direct voltage voltage size changes fixing SPWM pulsewidth, make ac output voltage reach the purpose of voltage stabilizing.According to above-mentioned principle, in order to stablize ac voltage, according to exchanging sine wave output shape, under the common control of CPU1 and CPU2, high direct voltage changes; And, in the dc inversion ac equipment, had cured a fixing SPWM pulsewidth function; Based on this fixing SPWM pulsewidth function, be to realize to the adjustment of alternating voltage through the amplitude that changes the SPWM pulsewidth, the amplitude of SPWM pulsewidth is that the size by high direct voltage decides; Therefore, the SPWM frequency of the sine wave that is produced can reach more than the 100KHZ, very little of sinusoidal wave output harmonic wave; Very stable of sinusoidal wave output frequency, like this, whole high efficiency inverter will be a very clean power supply; In addition, the voltage regulation result of ac output end is good, and its error can reach positive and negative 1%.
As improvement; At the booster converter and the dc inversion ac equipment of series connection successively that are parallel with between dc power output end and the ac output end more than one group; All booster converters are controlled by same CPU1, and all dc inversion ac equipments are controlled by same CPU2.This structure, the output end voltage mutual superposition of dc inversion ac equipment, thus reach the purpose that improves wattage output; In addition, utilize same CPU1 control booster converter, utilize same CPU2 detection or control dc inversion ac equipment, it is sinusoidal wave synchronous fully to guarantee that each dc inversion ac equipment is exported, and like this, can make to exchange to export to reach best efficiency.
As improvement, the output of DC power supply is connected with accessory power supply, and accessory power supply is given booster converter, dc inversion ac equipment, CPU1 and CPU2 power supply.
For reaching above-mentioned second purpose; A kind of inverse method of high efficiency inverter; Comprise: DC power supply output dc low-voltage is given booster converter, exports to the dc inversion ac equipment with high direct voltage after boosting through booster converter, in the dc inversion ac equipment, is solidified with fixing SPWM pulsewidth function; In the dc inversion ac equipment, form interchange output according to fixing SPWM pulsewidth function; In the inversion process; Regulate high direct voltage through AC detection circuit, CPU1 and CPU2; Reach to exchange to export and have the purpose of burning voltage; Its process is: the sine wave that the continual detection of CPU2 is produced by the dc inversion ac equipment, and tell to CPU1 that with the position of sine wave CPU1 gathers the voltage signal of ac output end through AC detection circuit at the crest time point of sine wave; And in CPU1, convert voltage signal into digital signal; Through the voltage swing of numeral regulation and control,, make ac output voltage reach the purpose of voltage stabilizing through changing the amplitude that high direct voltage voltage size changes fixing SPWM pulsewidth through metal-oxide-semiconductor or IGBT drive circuit adjusting booster converter output.
According to said method, in order to stablize ac voltage, according to exchanging sine wave output shape, under the common control of CPU1 and CPU2, high direct voltage changes; And, in the dc inversion ac equipment, had cured a fixing SPWM pulsewidth function; Based on this fixing SPWM pulsewidth function, be to realize to the adjustment of alternating voltage through the amplitude that changes the SPWM pulsewidth, the amplitude of SPWM pulsewidth is that the size by high direct voltage decides; Therefore, the SPWM frequency of the sine wave that is produced can reach more than the 100KHZ, very little of sinusoidal wave output harmonic wave; Very stable of sinusoidal wave output frequency, like this, whole high efficiency inverter will be a very clean power supply; In addition, the voltage regulation result of ac output end is good, and its error can reach positive and negative 1%.
As improvement; At the booster converter and the dc inversion ac equipment of series connection successively that are parallel with between dc power output end and the ac output end more than one group; All booster converters are controlled by same CPU1, and all dc inversion ac equipments are controlled by same CPU2, make the ac synchronous of from each dc inversion ac equipment, exporting; Make to exchange to export to reach best efficiency, and can improve the wattage of output.
As improvement, when ac output end is zero load, realize hop cycle work through metal-oxide-semiconductor or IGBT drive circuit control booster converter by CPU1, when guaranteeing that ac output end is zero load, also can voltage stabilizing.
In the present invention, the voltage signal of ac output end is meant the voltage sine wave signal of ac output end.
Description of drawings
Fig. 1 is the pulse of prior art PWM pulsewidth before changing and the oscillogram of corresponding half period.
Fig. 2 is the pulse of prior art PWM pulsewidth after changing and the oscillogram of corresponding half period.
Fig. 3 connects block diagram for high efficiency inverter of the present invention.
The high efficiency inverter of Fig. 4 after for parallel connection a plurality of connect successively booster converter and dc inversion ac equipments is connected block diagram.
The oscillogram of the half period of pulse before and correspondence takes place in Fig. 5 for SPWM pulsewidth amplitude of the present invention.
The oscillogram of the half period of pulse afterwards and correspondence takes place in Fig. 6 for SPWM pulsewidth amplitude of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further elaborated.
Embodiment 1
As shown in Figure 3, the high efficiency inverter comprises DC power supply, booster converter, dc inversion ac equipment, accessory power supply, CPU1, CPU2 and AC detection circuit; In this execution mode; DC power supply is a storage battery, and booster converter is accomplished the device that dc low-voltage is converted into high direct voltage, belongs to prior art; The dc inversion ac equipment is used for high direct voltage is converted into the device of interchange, belongs to the device commonly used in the inverter.
High efficiency inverter for present embodiment; DC power supply output dc low-voltage is given booster converter; Through booster converter boost the back export to the dc inversion ac equipment with high direct voltage; In the dc inversion ac equipment, be solidified with fixing SPWM pulsewidth function, in the dc inversion ac equipment, form interchange output according to fixing SPWM pulsewidth function; Wherein the power supply of booster converter, dc inversion ac equipment, CPU1 and CPU2 is supplied with by accessory power supply, and the electric weight of accessory power supply is from DC power supply.In the inversion process; Regulate high direct voltage through AC detection circuit, CPU1 and CPU2; Reach to exchange to export and have the purpose of burning voltage; Its process is: the sine wave that the continual detection of CPU2 is produced by the dc inversion ac equipment, and tell to CPU1 that with the position of sine wave CPU1 gathers the voltage signal of ac output end through AC detection circuit at the crest time point of sine wave; And in CPU1, convert voltage signal into digital signal; Through the voltage swing of numeral regulation and control,, make ac output voltage reach the purpose of voltage stabilizing through changing the amplitude that high direct voltage voltage size changes fixing SPWM pulsewidth through metal-oxide-semiconductor or IGBT drive circuit adjusting booster converter output.
According to above-mentioned principle, like Fig. 3,5 and shown in Figure 6, in order to stablize ac voltage, according to exchanging sine wave output shape, under the common control of CPU1 and CPU2, high direct voltage changes; And, in the dc inversion ac equipment, had cured a fixing SPWM pulsewidth function; Based on this fixing SPWM pulsewidth function, be to realize to the adjustment of alternating voltage through the amplitude that changes the SPWM pulsewidth, the amplitude of SPWM pulsewidth is that the size by high direct voltage decides; Therefore, the SPWM frequency of the sine wave that is produced can reach more than the 100KHZ, very little of sinusoidal wave output harmonic wave; Very stable of sinusoidal wave output frequency, like this, whole high efficiency inverter will be a very clean power supply; In addition, the voltage regulation result of ac output end is good, and its error can reach positive and negative 1%.
Embodiment 2
As shown in Figure 4, the high efficiency inverter comprises DC power supply, plural booster converter, plural dc inversion ac equipment, accessory power supply, CPU1, CPU2 and AC detection circuit; In this execution mode; DC power supply is a storage battery, and booster converter is accomplished the device that dc low-voltage is converted into high direct voltage, belongs to prior art; The dc inversion ac equipment is used for high direct voltage is converted into the device of interchange, belongs to the device commonly used in the inverter.
High efficiency inverter for present embodiment; DC power supply output dc low-voltage is given booster converter; Through booster converter boost the back export to the dc inversion ac equipment with high direct voltage; In the dc inversion ac equipment, be solidified with fixing SPWM pulsewidth function, in the dc inversion ac equipment, form interchange output according to fixing SPWM pulsewidth function; Wherein the power supply of booster converter, dc inversion ac equipment, CPU1 and CPU2 is supplied with by accessory power supply, and the electric weight of accessory power supply is from DC power supply.In the inversion process; Regulate high direct voltage through AC detection circuit, CPU1 and CPU2; Reach to exchange to export and have the purpose of burning voltage; Its process is: the sine wave that the continual detection of CPU2 is produced by the dc inversion ac equipment, and tell to CPU1 that with the position of sine wave CPU1 gathers the voltage signal of ac output end through AC detection circuit at the crest time point of sine wave; And in CPU1, convert voltage signal into digital signal; Through the voltage swing of numeral regulation and control,, make ac output voltage reach the purpose of voltage stabilizing through changing the amplitude that high direct voltage voltage size changes fixing SPWM pulsewidth through metal-oxide-semiconductor or IGBT drive circuit adjusting booster converter output.
In the present embodiment; A booster converter and a dc inversion ac equipment series connection back are parallelly connected with mutual booster converter of connecting of other groups and dc inversion ac equipment; Make the ac output end of each dc inversion ac equipment import in the ac output end, improve the interchange wattage output.All booster converters are controlled by same CPU1, and all dc inversion ac equipments are detected and control by same CPU2, and like this, it is sinusoidal wave synchronously complete to guarantee that each dc inversion ac equipment is exported, and can make to exchange to export to reach best efficiency.
In addition, when ac output end is zero load, realize hop cycle work through metal-oxide-semiconductor or IGBT drive circuit control booster converter by CPU1, when guaranteeing that ac output end is zero load, also can voltage stabilizing.
According to above-mentioned principle, like Fig. 4,5 and shown in Figure 6, in order to stablize ac voltage, according to exchanging sine wave output shape, under the common control of CPU1 and CPU2, high direct voltage changes; And, in the dc inversion ac equipment, had cured a fixing SPWM pulsewidth function; Based on this fixing SPWM pulsewidth function, be to realize to the adjustment of alternating voltage through the amplitude that changes the SPWM pulsewidth, the amplitude of SPWM pulsewidth is that the size by high direct voltage decides; Therefore, the SPWM frequency of the sine wave that is produced can reach more than the 100KHZ, very little of sinusoidal wave output harmonic wave; Very stable of sinusoidal wave output frequency, like this, whole high efficiency inverter will be a very clean power supply; In addition, the voltage regulation result of ac output end is good, and its error can reach positive and negative 1%.In addition, also improve the wattage that exchanges output, improved utilance.
Claims (6)
1. high efficiency inverter; Comprise DC power supply, booster converter, dc inversion ac equipment; DC power supply is input to the output high direct voltage of boosting in the booster converter with dc low-voltage; High direct voltage forms pulse through the dc inversion ac equipment through the SPWM technology, in the dc inversion ac equipment, exports to exchange; It is characterized in that: be connected with CPU1 through metal-oxide-semiconductor or IGBT drive circuit on the booster converter; Be connected with CPU2 on the dc inversion ac equipment, the mutual communication of CPU1 and CPU2; Be connected with AC detection circuit between CPU1 and the ac output end; In the dc inversion ac equipment, be solidified with fixing SPWM pulsewidth function.
2. high efficiency inverter according to claim 1; It is characterized in that: at the booster converter and the dc inversion ac equipment of series connection successively that are parallel with between dc power output end and the ac output end more than one group; All booster converters are controlled by same CPU1, and all dc inversion ac equipments are controlled by same CPU2.
3. high efficiency inverter according to claim 1 and 2 is characterized in that: the output of DC power supply is connected with accessory power supply, and accessory power supply is given booster converter, dc inversion ac equipment, CPU1 and CPU2 power supply.
4. the inverse method of a high efficiency inverter; It is characterized in that may further comprise the steps: DC power supply output dc low-voltage is given booster converter; Through booster converter boost the back export to the dc inversion ac equipment with high direct voltage; In the dc inversion ac equipment, be solidified with fixing SPWM pulsewidth function, in the dc inversion ac equipment, form interchange output according to fixing SPWM pulsewidth function; In the inversion process; Regulate high direct voltage through AC detection circuit, CPU1 and CPU2; Reach to exchange to export and have the purpose of burning voltage; Its process is: the sine wave that the continual detection of CPU2 is produced by the dc inversion ac equipment, and tell to CPU1 that with the position of sine wave CPU1 gathers the voltage signal of ac output end through AC detection circuit at the crest time point of sine wave; And in CPU1, convert voltage signal into digital signal; Through the voltage swing of numeral regulation and control,, make ac output voltage reach the purpose of voltage stabilizing through changing the amplitude that high direct voltage voltage size changes fixing SPWM pulsewidth through metal-oxide-semiconductor or IGBT drive circuit adjusting booster converter output.
5. the inverse method of high efficiency inverter according to claim 4; It is characterized in that: at the booster converter and the dc inversion ac equipment of series connection successively that are parallel with between dc power output end and the ac output end more than one group; All booster converters are controlled by same CPU1; All dc inversion ac equipments are controlled by same CPU2, make the ac synchronous of from each dc inversion ac equipment, exporting.
6. the inverse method of high efficiency inverter according to claim 4 is characterized in that: when ac output end is zero load, realize hop cycle work by CPU1 through metal-oxide-semiconductor or IGBT drive circuit control booster converter.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090153182A1 (en) * | 2007-12-17 | 2009-06-18 | Renesas Technology Corp. | Semiconductor device |
| CN101783591A (en) * | 2009-01-19 | 2010-07-21 | 恩益禧电子股份有限公司 | Booster circuit and pwm signal generator |
| CN101867291A (en) * | 2009-04-17 | 2010-10-20 | 吕斌 | Household solar photovoltaic inverter |
| CN101951722A (en) * | 2010-10-15 | 2011-01-19 | 中冶北方工程技术有限公司 | Energy-saving type emergency lighting distribution box |
| CN202535289U (en) * | 2012-02-21 | 2012-11-14 | 陈清娇 | High-efficiency inverter |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090153182A1 (en) * | 2007-12-17 | 2009-06-18 | Renesas Technology Corp. | Semiconductor device |
| CN101783591A (en) * | 2009-01-19 | 2010-07-21 | 恩益禧电子股份有限公司 | Booster circuit and pwm signal generator |
| CN101867291A (en) * | 2009-04-17 | 2010-10-20 | 吕斌 | Household solar photovoltaic inverter |
| CN101951722A (en) * | 2010-10-15 | 2011-01-19 | 中冶北方工程技术有限公司 | Energy-saving type emergency lighting distribution box |
| CN202535289U (en) * | 2012-02-21 | 2012-11-14 | 陈清娇 | High-efficiency inverter |
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