CN102347704A - Low voltage push-pull inversion direct DC-AC conversion circuit - Google Patents
Low voltage push-pull inversion direct DC-AC conversion circuit Download PDFInfo
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- CN102347704A CN102347704A CN2010102399291A CN201010239929A CN102347704A CN 102347704 A CN102347704 A CN 102347704A CN 2010102399291 A CN2010102399291 A CN 2010102399291A CN 201010239929 A CN201010239929 A CN 201010239929A CN 102347704 A CN102347704 A CN 102347704A
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Abstract
The invention provides a low voltage push-pull inversion direct DC-AC conversion circuit which comprises an inversion circuit, a transformer circuit and a filter circuit. Through enabling power MOSFET in the inversion circuit to work at a quasi-resonance soft-switching state, inputted low voltage direct current is converted into low voltage alternating current pulse voltage, converted into high voltage alternating current pulse voltage through the transformer circuit, and converted into 220V effective value sine half-wave voltage or square wave voltage through the filter circuit. According to quasi-resonance soft-switching and power frequency inversion work principles, a low voltage push-pull inversion direct DC-AC conversion circuit design scheme is designed. The invention has the advantages of simple structure, easy realization, strong versatility, high efficiency and the like.
Description
Technical field
The present invention relates to a kind of direct DC-AC translation circuit, particularly a kind of low pressure is recommended the direct DC-AC translation circuit of inversion.
Background technology
Application scenario in storage battery and solar cell power supply; Because the direct voltage grade of input is lower; Often be+12VDC ,+24VDC or the like; Be not inconsistent with the power supply grade of the electric equipment of using always; Therefore, often need adopt the DC-AC converter that boosts to convert the low-voltage dc voltage of importing into ac sine wave voltage or ac square-wave voltage that effective value is 220V.The isolation high frequency transformer that the higher DC-AC converter of output voltage generally all need boost; There is a DC link that rectifier bridge and electrochemical capacitor constitute in the capital; And output needs the inverter of high frequency chopping, thereby has complex design, complete machine huge with efficient low wait not enough.
How to improve the deficiency of existing DC-AC converter, become the technical task that those skilled in the art need to be resolved hurrily in fact.
Summary of the invention
The object of the present invention is to provide the simple low pressure of a kind of circuit structure to recommend the direct DC-AC translation circuit of inversion.
Reach other purposes in order to achieve the above object; Low pressure of the present invention is recommended the direct DC-AC translation circuit of inversion; Comprise: two groups of inverter circuits of each self-contained power MOSFET tube, the low-voltage dc voltage that is respectively applied for input converts the PWM potential pulse that first-harmonic is the high frequency low voltage of power frequency into; Two groups of transformer circuits that parameter is identical; Be connected one group of inverter circuit output separately, through with the drain-source of the power MOSFET of corresponding inverter circuit between parasitic capacitance produce resonance the PWM potential pulse electromagnetic coupled of the high frequency low voltage that inserts is become first-harmonic be the high voltagehigh frequency voltage of power frequency; And two groups of filter circuits of serial connection; Be connected the output of one group of transforming circuit separately; Each the self-contained high speed diode and first electrochemical capacitor; Respectively with the high voltagehigh frequency voltage commutation that inserts and filtering so that obtain sinusoidal forward half-wave and the negative half-wave that first-harmonic is a power frequency respectively; And then become all-wave at output, wherein half-wave is sine wave or square wave.
Wherein, each group inverter circuit all comprises: the two MOSFET pipe that is attempted by second electrochemical capacitor of input and is connected said second electrochemical capacitor, one end.
Wherein, each group transformer circuit comprises a transformer and is connected the inductance of transformer secondary output winding one end, and wherein, the two ends of said primary winding are connected with MOSFET pipe respectively, wherein between tap connect the other end of said second electrochemical capacitor.
Wherein, Each group filter circuit comprises: input is respectively with the corresponding transformer secondary output winding other end and inductance is connected and the rectifier bridge that is made up of 4 high speed diodes, the RC filter circuit that is connected in parallel on said rectification bridge output end; Wherein, said RC filtered electrical routing capacitance, first electrochemical capacitor and resistance are formed in parallel.
In sum; The direct DC-AC translation circuit that low pressure of the present invention is recommended inversion makes that power MOSFET is operated in the quasi-resonance soft switch state in the inverter circuit; Low-voltage direct with input converts the low-voltage alternating-current pulse voltage into thus; Convert the high-voltage alternating pulse voltage into through transforming circuit again; And convert half-sinusoid voltage or the square-wave voltage that effective value is 220V into by filter circuit; This circuit design is according to resonant type soft-switch and power frequency inversion operation principle; Designed low pressure and recommended the direct DC-AC translation circuit design of inversion, had simple in structure; Realize easily; Highly versatile; Efficient is than advantages such as height.
Description of drawings
Fig. 1 recommends the circuit diagram of the direct DC-AC translation circuit of inversion for low pressure of the present invention.
Embodiment
The direct DC-AC translation circuit that below will combine accompanying drawing low pressure of the present invention to recommend inversion is set forth in detail.
See also Fig. 1, the direct DC-AC translation circuit that low pressure of the present invention is recommended inversion mainly comprises: inverter circuit 1, transformer circuit 2 and filter circuit 3.
Said inverter circuit 1 comprises two groups, is made up of electrochemical capacitor E1, power MOSFET tube S1, S2 for one group, and another group is made up of electrochemical capacitor E2, power MOSFET tube S3, S4; Said transformer circuit 2 also comprises two groups, and one group is made up of transformer HFT1 and inductance L 1, and one group is made up of transformer HFT2 and inductance L 2; Said filter circuit 3 also comprises two groups, is made up of high speed diode D1-D4, capacitor C 1, electrochemical capacitor E3 and resistance R 1 for one group, and another group is made up of high speed diode D5-D8, capacitor C 2, electrochemical capacitor E4.
In inverter circuit 1; The drain electrode of power MOSFETS 1 links to each other with an end of the elementary winding of high frequency transformer HFT1; The drain electrode of power MOSFETS 2 links to each other with the other end of the elementary winding of high frequency transformer HFT1; The drain electrode of power MOSFETS 3 links to each other with an end of the elementary winding of high frequency transformer HFT2; The drain electrode of power MOSFETS 4 links to each other with the other end of the elementary winding of transforming circuit medium-high frequency transformer HFT2; After linking to each other with the center-side of the elementary winding of high frequency transformer HFT1, the anode of electrochemical capacitor E1 links to each other with input voltage is anodal; After linking to each other with the center-side of the elementary winding of high frequency transformer HFT2, the anode of electrochemical capacitor E2 links to each other with input voltage is anodal; The source electrode of power MOSFETS 1 links to each other with the source electrode of power MOSFETS 2 and links to each other with the input voltage negative pole after the back links to each other with the negative electrode of electrochemical capacitor E1, and the source electrode of power MOSFETS 3 links to each other with the source electrode of power MOSFETS 4 and links to each other with the input voltage negative pole after the back links to each other with the negative electrode of electrochemical capacitor E2.
In transformer circuit; One end of flat surface transformer HFT1 secondary winding links to each other with the end of resonant inductance L1; The anode of the other end of resonant inductance L1 and filter circuit high speed diode D1; The negative electrode of high speed diode D3 links to each other; The anode of the other end of flat surface transformer HFT1 secondary winding and filter circuit high speed diode D2; The negative electrode of high speed diode D4 links to each other; One end of flat surface transformer HFT2 secondary winding links to each other with the end of resonant inductance L2; The negative electrode of the other end of resonant inductance L2 and filter circuit high speed diode D5; The anode of high speed diode D7 links to each other, the negative electrode of the other end of flat surface transformer HFT2 secondary winding and filter circuit high speed diode D6; The anode of high speed diode D4 links to each other.
In filter circuit; The negative electrode of high speed diode D1; The negative electrode of high speed diode D2; The anode of electrochemical capacitor E3; The end of ac capacitor C1; One end of resistance R 1 links to each other with an ac output end L after linking to each other; The negative electrode of high speed diode D7; The negative electrode of high speed diode D8; The anode of electrochemical capacitor E4; The end of ac capacitor C2; One end of resistance R 2 link to each other back and another ac output end-link to each other the anode of high speed diode D3; The anode of high speed diode D4; The anode of high speed diode D5; The anode of high speed diode D6; The negative electrode of electrochemical capacitor E3; The negative electrode of electrochemical capacitor E4; The other end of ac capacitor C1; The other end of resistance R 1 links to each other.
The operation principle of foregoing circuit is:
In the inverter circuit, adopt tradition to recommend the PWM modulation algorithm, one group of S1 and S2, one group of S3 and S43 can be transformed into the PWM potential pulse that first-harmonic is the high frequency low voltage of power frequency with the low-voltage dc voltage of input, are back level transforming circuit power supply.In the transformer circuit, the high frequency flat surface transformers that two parameters are consistent, the first-harmonic that receives input respectively is the PWM potential pulse of the high frequency low voltage of power frequency, through electromagnetic coupled independently, exporting first-harmonic separately is the high voltagehigh frequency voltage of power frequency.In the filter circuit,, obtain half-sinusoid or square wave that first-harmonic is a power frequency through high speed diode and electrochemical capacitor rectification and filter action.Wherein, The independent converter work that power MOSFETS 1～S2, high frequency transformer HFT1, resonant inductance L1, high speed diode D1～D4, electrochemical capacitor E3 etc. constitute; Export positive half cycle voltage waveform; The independent converter work that power MOSFET S3～S4, high frequency transformer HFT2, resonant inductance L2, high speed diode D5～D8, electrochemical capacitor E4 etc. constitute; Output negative half period voltage waveform; Two parts are taked time-sharing work; Cycle is the output cycle, and the output voltage series connection constitutes ac output voltage.Whole device is accomplished the conversion by low-voltage dc voltage-High AC voltage, need not DC link.
Transforming circuit midplane transformer resonance inductance is converted the transmission electric capacity generation resonance effect between the drain-source of elementary, equivalent elementary leakage inductance and power MOSFET S1～S4; Through selecting suitable resonant inductance amount size; Make resonance frequency equal switching frequency; The no-voltage that can realize power MOSFET S1～S4 open and be fully loaded with near zero-current switching, reduce switching loss and reduce the EMI noise.In order further to raise the efficiency and to reduce volume, high frequency transformer adopts high performance flat surface transformer.
Each resistance, diode, transformer, inductance all require to have high-performance in the above-mentioned device; The parameter of one embodiment of the invention is: input direct voltage 12VDC, output AC voltage effective value are ac sinusoidal voltage or the ac square-wave voltage of 220VAC.Electrochemical capacitor E1 and E2 get 4x3300 μ F respectively, 16V, and actual separately two parallel connections disperse to arrange nearby.Electrochemical capacitor E3 and E4 get 1x47 μ F, 400V.Grading resistor R1 and R2 get 5.1k Ω, 1W.High speed diode D1～D8 is KSQ15A06B, and snap back recovers, and actual two parallel connections are installed on radiator.Power MOSFET S1～S4 gets IRF3205, and actual separately three parallel connections are installed on radiator.Ac capacitor C1～C2 gets 1x0.1 μ F, 400V.Flat surface transformer is EE43, elementary 2 circles, secondary 44 circles.Resonant inductance L1 gets 300 μ H, ampacity 5A.
In sum; The direct DC-AC translation circuit that low pressure of the present invention is recommended inversion is that the part of three interwovenesses is formed by inverter circuit, transforming circuit and filter circuit; Its essence is exactly: inverter circuit 1 is accomplished the conversion of direct current low amplitude value voltage to high frequency low amplitude value alternating voltage; It is high frequency amplitude alternating voltage that transforming circuit is responsible for high frequency low amplitude value AC voltage conversion; And be transported to filter circuit; Parasitic capacitance generation resonance between the drain-source of power MOSFET in resonant inductance in the while transforming circuit and leakage inductance and the inverter circuit; Can realize Zero-voltage soft switch and near fully loaded zero-current soft switch, reduce switching loss.The use of flat surface transformer can reduce volume and raise the efficiency, and the series connection of elementary winding can be simplified the design of transformer.Obviously, this circuit have simple in structure, realize easily, highly versatile, efficient be than advantages such as height.
The foregoing description is just listed expressivity principle of the present invention and effect is described, but not is used to limit the present invention.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present invention and scope.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (5)
1. a low pressure is recommended the direct DC-AC translation circuit of inversion, it is characterized in that comprising:
Two groups of inverter circuits of each self-contained power MOSFET tube, the low-voltage dc voltage that is respectively applied for input converts the PWM potential pulse that first-harmonic is the high frequency low voltage of power frequency into;
Two groups of transformer circuits that parameter is identical; Be connected one group of inverter circuit output separately, through with the drain-source of the power MOSFET of corresponding inverter circuit between parasitic capacitance produce resonance the PWM potential pulse electromagnetic coupled of the high frequency low voltage that inserts is become first-harmonic be the high voltagehigh frequency voltage of power frequency;
Two groups of filter circuits of serial connection; Be connected the output of one group of transforming circuit separately; Each the self-contained high speed diode and first electrochemical capacitor; Respectively with the high voltagehigh frequency voltage commutation that inserts and filtering so that obtain sinusoidal forward half-wave and the negative half-wave that first-harmonic is a power frequency respectively; And then become all-wave at output, wherein half-wave is sine wave or square wave.
2. low pressure as claimed in claim 1 is recommended the direct DC-AC translation circuit of inversion, it is characterized in that: each group inverter circuit all comprises: the two MOSFET pipe that is attempted by second electrochemical capacitor of input and is connected said second electrochemical capacitor, one end.
3. low pressure as claimed in claim 2 is recommended the direct DC-AC translation circuit of inversion; It is characterized in that: each group transformer circuit comprises a transformer and the inductance that is connected transformer secondary output winding one end; Wherein, The two ends of said primary winding are connected with MOSFET pipe respectively, wherein between tap connect the other end of said second electrochemical capacitor.
4. low pressure as claimed in claim 3 is recommended the direct DC-AC translation circuit of inversion, it is characterized in that: transformer is a flat surface transformer.
5. recommend the direct DC-AC translation circuit of inversion like claim 3 or 4 described low pressure; It is characterized in that: each group filter circuit comprises: input is respectively with the corresponding transformer secondary output winding other end and inductance is connected and the rectifier bridge that is made up of 4 high speed diodes, the RC filter circuit that is connected in parallel on said rectification bridge output end; Wherein, said RC filtered electrical routing capacitance, first electrochemical capacitor and resistance are formed in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010239929.1A CN102347704B (en) | 2010-07-29 | 2010-07-29 | The direct DC-AC conversion circuit of low voltage push-pull inversion |
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| CN201010239929.1A CN102347704B (en) | 2010-07-29 | 2010-07-29 | The direct DC-AC conversion circuit of low voltage push-pull inversion |
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| CN102347704B CN102347704B (en) | 2015-08-19 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490489A (en) * | 2012-06-13 | 2014-01-01 | 洛阳嘉盛电源科技有限公司 | Electric-vehicle charging device |
| CN106849685A (en) * | 2017-03-09 | 2017-06-13 | 王乾 | A kind of emergent efficient generating apparatus and emergent efficient electric power generation method |
| CN107147316A (en) * | 2017-05-17 | 2017-09-08 | 华南师范大学 | A kind of AC power circuit and its control method |
| CN107317501A (en) * | 2017-08-28 | 2017-11-03 | 宁波德业变频技术股份有限公司 | High frequency transformer secondary parallel balancing circuitry |
| CN111446875A (en) * | 2020-04-24 | 2020-07-24 | 哈尔滨工业大学 | Efficiency improvement method for piezoelectric actuation unit inversion type power amplification circuit |
| CN112653349A (en) * | 2020-12-22 | 2021-04-13 | 航天科技控股集团股份有限公司 | Main circuit of 2000W vehicle-mounted inverter |
Citations (4)
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| CN1479440A (en) * | 2002-06-05 | 2004-03-03 | 欧姆龙株式会社 | Transforming device of push-pull circuit type |
| CN1545194A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Cascading bidirectional DC-DC converter |
| TW200505145A (en) * | 2003-07-30 | 2005-02-01 | Delta Electronics Inc | Zero-voltage switching push-pull converter |
| CN201758366U (en) * | 2010-07-29 | 2011-03-09 | 上海儒竞电子科技有限公司 | Low-voltage push-pull inversion direct DC-AC conversion circuit |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1479440A (en) * | 2002-06-05 | 2004-03-03 | 欧姆龙株式会社 | Transforming device of push-pull circuit type |
| TW200505145A (en) * | 2003-07-30 | 2005-02-01 | Delta Electronics Inc | Zero-voltage switching push-pull converter |
| CN1545194A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Cascading bidirectional DC-DC converter |
| CN201758366U (en) * | 2010-07-29 | 2011-03-09 | 上海儒竞电子科技有限公司 | Low-voltage push-pull inversion direct DC-AC conversion circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490489A (en) * | 2012-06-13 | 2014-01-01 | 洛阳嘉盛电源科技有限公司 | Electric-vehicle charging device |
| CN106849685A (en) * | 2017-03-09 | 2017-06-13 | 王乾 | A kind of emergent efficient generating apparatus and emergent efficient electric power generation method |
| CN107147316A (en) * | 2017-05-17 | 2017-09-08 | 华南师范大学 | A kind of AC power circuit and its control method |
| CN107147316B (en) * | 2017-05-17 | 2019-06-11 | 华南师范大学 | A kind of AC power circuit and its control method |
| CN107317501A (en) * | 2017-08-28 | 2017-11-03 | 宁波德业变频技术股份有限公司 | High frequency transformer secondary parallel balancing circuitry |
| CN111446875A (en) * | 2020-04-24 | 2020-07-24 | 哈尔滨工业大学 | Efficiency improvement method for piezoelectric actuation unit inversion type power amplification circuit |
| CN112653349A (en) * | 2020-12-22 | 2021-04-13 | 航天科技控股集团股份有限公司 | Main circuit of 2000W vehicle-mounted inverter |
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| CN102347704B (en) | 2015-08-19 |
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Owner name: RUKING EMERSON CLIMATE TECHNOLOGY (SHANGHAI) CO., Free format text: FORMER OWNER: SHANGHAI RUKING ELECTRONIC SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20140813 |
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