CN201781429U - Low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion - Google Patents
Low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion Download PDFInfo
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- CN201781429U CN201781429U CN2010202752236U CN201020275223U CN201781429U CN 201781429 U CN201781429 U CN 201781429U CN 2010202752236 U CN2010202752236 U CN 2010202752236U CN 201020275223 U CN201020275223 U CN 201020275223U CN 201781429 U CN201781429 U CN 201781429U
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Abstract
The utility model relates to a low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion, which consists of a high-frequency inverter circuit, a voltage transformation circuit, an energy storage circuit and a power frequency inverter circuit. A power MOSFET in the high-frequency inverter circuit works in a quasi harmonic oscillation soft switching state, input low-voltage direct-current is converted into low-voltage alternating-current pulse voltage, the low-voltage alternating-current pulse voltage is converted into high-voltage alternating-current pulse voltage via the voltage transformation circuit and then converted into sine half-wave voltage or square-wave voltage with the effective value of 220V through the energy storage circuit. Further, the sine half-wave voltage or square-wave voltage is inverted into power frequency sine alternating-current voltage or alternating-current square-wave voltage through the power frequency inverter circuit. According to the harmonic oscillation soft switching or power frequency inversion operating principle, the low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion is designed and has the advantages of simple structure, easy implementing, strong universality, higher efficiency and the like.
Description
Technical field
The utility model relates to the power circuit design of the DC-AC converter of a kind of low-voltage dc voltage power supply, full-bridge inverting, this DC-AC converter scheme need not DC link and have the multistage transformer output-parallel, have simplicity of design, with low cost, support feature such as high-power output.
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, generally need to adopt the DC-DC converter that boosts that the low-voltage dc voltage of importing is converted to AC sine wave voltage or the ac square-wave voltage that effective value is 220V.The higher DC-DC converter of output voltage generally all needs the isolation high frequency transformer that boosts, there is a DC link that has rectifier bridge and electrochemical capacitor to constitute in the capital, and output needs the inverter of high frequency chopping, thereby it is complicated to have a design, the huge and efficient of complete machine is low wait not enough.
The utility model content
The purpose of this utility model is a kind of novel employing full-bridge inverting will be provided, have the multistage transformer output-parallel and need not the power circuit design of the DC-AC converter of DC link, it can be suitable for all application scenarios that need AC sine wave or square-wave voltage, has that notion is pure and fresh, flexibility is strong, the advantage of simplicity of design.
For achieving the above object, the utility model adopts following technical scheme: a kind of direct DC-AC translation circuit of low-voltage input full-bridge inverting, it is characterized in that this circuit comprises the high-frequency inverter circuit that is used for low-voltage dc voltage is converted to the low-voltage alternating-current pulse voltage, be used for the low-voltage alternating-current pulse voltage is converted to the transforming circuit of high-voltage alternating pulse voltage, being used for high-voltage alternating pulse voltage rectifying and wave-filtering is the accumulator of high-voltage dc voltage and the power frequency inverter circuit that is used for high-voltage dc voltage is reverse into industrial frequency AC sine voltage or ac square-wave voltage; Described high-frequency inverter circuit comprises the power MOS pipe group, and described transforming circuit comprises the elementary winding and the secondary winding that is connected with accumulator of some series connection, is provided with resonant inductance L1 between described elementary winding and the high-frequency inverter circuit; Described accumulator comprises the current rectifying and wave filtering circuits of 2 groups of series connection, and described current rectifying and wave filtering circuit comprises diode respectively, the electrochemical capacitor E2 that connects with diode, the capacitor C 1 in parallel with electrochemical capacitor.
Preferably, be parallel with resistance R on the electrochemical capacitor in the described current rectifying and wave filtering circuit.
Preferably, be parallel with electrochemical capacitor E1 on the power MOS pipe group in the described high-frequency inverter circuit.
Preferably, described power MOS pipe group comprises four power MOSFETSs 1, MOSFETS2, MOSFETS3, MOSFETS4; Described transforming circuit comprises transformer HFT1, HFT2, HFT3; Described power frequency inverter circuit comprises power MOSFETS 5, power MOSFETS 6, power MOSFETS 7, power MOSFETS 8 and ac capacitor and resistance R 3;
Wherein, the drain electrode of power MOSFET S1, after linking to each other with the anode of electrochemical capacitor E1, the drain electrode of power MOSFET S2 links to each other with the positive pole of input direct voltage, the drain electrode of power MOSFET S3, after linking to each other with the negative electrode of electrochemical capacitor E1, the source electrode of power MOSFET S4 links to each other with the negative pole of input direct voltage, the drain electrode of power MOSFET S1, the drain electrode of power MOSFET S3 links to each other with the end of resonant inductance L1, and an end of the elementary winding of transformer HFT1 links to each other the drain electrode of power MOSFETS 2 in back and the transforming circuit, the drain electrode of power MOSFET S4 links to each other with an end of the elementary winding of transformer HFT3 in the transforming circuit;
The other end of primary winding HFT1 links to each other with an end of the elementary winding of transformer HFT2, and the other end of the elementary winding of transformer HFT2 links to each other with the other end of the elementary winding of transformer HFT3;
One end of one end of one end of transformer HFT1 secondary winding, transformer HFT2 secondary winding, transformer HFT3 secondary winding links to each other with the anode of accumulator high speed diode D1, the negative electrode of high speed diode D2, and the negative electrode of electrochemical capacitor E2, the anode of electrochemical capacitor E3, the end of ac capacitor C1, the end of ac capacitor C2, an end of resistance R 1, the other end of resistance R 2 link to each other in the other end of the other end of transformer HFT1 secondary winding, transformer HFT2 secondary winding, the other end of transformer HFT3 secondary winding and the accumulator;
The link to each other drain electrode of power MOSFET S5 in back and the power frequency inverter circuit, the drain electrode of power MOSFET S6 of the other end of the other end of the anode of the negative electrode of high speed diode D1, electrochemical capacitor E2, ac capacitor C1, resistance R 1 links to each other, and the other end of the negative electrode of the anode of high speed diode D2, electrochemical capacitor E3, the other end of ac capacitor C2, resistance R 2 links to each other afterwards and to link to each other with the source electrode, the source electrode of power MOSFET S8 of power MOSFET S7 in the power frequency inverter circuit;
After linking to each other with the drain electrode of power MOSFET S7, the source electrode of power MOSFET S5 links to each other with the end of ac capacitor C3, an end of resistance R 3, and link to each other with the live wire L of output AC voltage Uo, link to each other with the other end of ac capacitor C3, the other end of resistance R 3 after the source electrode of power MOSFET S6 links to each other with the drain electrode of power MOSFET S8, and link to each other with the zero line N of output AC voltage Uo.
Preferably, transformer HFT1, HFT2, HFT3 are flat surface transformer in the described transforming circuit.
The utility model reduces switching loss, primary windings in series reduction simplified design etc. according to high-frequency inverter, power frequency inverter, high frequency transformer operation principle and resonant type soft-switch technology, designed and produced novel step-up DC-AC converter of supporting high-power stream output, thereby have features such as design concept novelty, highly versatile, have simultaneously simple in structure, cost is low, realization is easy, efficient is than advantages such as height, can also support the output of relative broad range power, the alternating voltage output that is particularly useful for low-voltage power supply is used.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is further described.
The direct DC-AC translation circuit of full-bridge inverting of the present utility model is made of high-frequency inverter circuit 1, transforming circuit 2, accumulator 3, power frequency inverter circuit 4 as shown in Figure 1.
High-frequency inverter circuit 1 comprises four power MOSFET S1～S4, a resonant inductance L1 and an electrochemical capacitor E1; Transforming circuit 2 comprises three flat surface transformer HFT1～HFT3; Accumulator 3 comprises two high speed diode D1～D2, two ac capacitor C1～C2, two electrochemical capacitor E2～E3 and two resistance R 1～R2; Power frequency inverter circuit 4 comprises four power MOSFETS 5～S8, a resistance R 3 and an ac capacitor C3.
In the high-frequency inverter circuit, the drain electrode of power MOSFET S1, the drain electrode of power MOSFET S2 link to each other with the anode of electrochemical capacitor E1 back and the positive pole of input direct voltage+link to each other, the drain electrode of power MOSFET S3, the source electrode of power MOSFET S4 link to each other with the negative electrode of electrochemical capacitor E1 back and the negative pole of input direct voltage-link to each other, the drain electrode of power MOSFET S1, after linking to each other with the end of resonant inductance L1, the drain electrode of power MOSFET S3 links to each other the drain electrode of power MOSFET S2 with an end of the elementary winding of transforming circuit midplane transformer HFT1, the drain electrode of power MOSFET S4 links to each other with an end of the elementary winding of transforming circuit midplane transformer HFT3.
In the transforming circuit, the other end of the elementary winding HFT1 of flat surface transformer links to each other with an end of the elementary winding of flat surface transformer HFT2, and the other end of the elementary winding of flat surface transformer HFT2 links to each other with the other end of the elementary winding of flat surface transformer HFT3.One end of // // flat surface transformer HFT1 secondary winding, one end of flat surface transformer HFT2 secondary winding, the anode of one end of flat surface transformer HFT3 secondary winding and accumulator high speed diode D1, the negative electrode of high speed diode D2 links to each other, the other end of flat surface transformer HFT1 secondary winding, the other end of flat surface transformer HFT2 secondary winding, the negative electrode of electrochemical capacitor E2 in the other end of flat surface transformer HFT3 secondary winding and the accumulator, the anode of electrochemical capacitor E3, the end of ac capacitor C1, the end of ac capacitor C2, one end of resistance R 1, the other end of resistance R 2 links to each other.
In the accumulator, the link to each other drain electrode of power MOSFET S5 in back and the power frequency inverter circuit, the drain electrode of power MOSFET S6 of the other end of the other end of the anode of the negative electrode of high speed diode D1, electrochemical capacitor E2, ac capacitor C1, resistance R 1 links to each other, and the other end of the negative electrode of the anode of high speed diode D2, electrochemical capacitor E3, the other end of ac capacitor C2, resistance R 2 links to each other afterwards and to link to each other with the source electrode, the source electrode of power MOSFET S8 of power MOSFET S7 in the power frequency inverter circuit.
In the power frequency inverter circuit, after linking to each other with the drain electrode of power MOSFET S7, the source electrode of power MOSFET S5 links to each other with the end of ac capacitor C3, an end of resistance R 3, and link to each other with the live wire L of output AC voltage Uo, link to each other with the other end of ac capacitor C3, the other end of resistance R 3 after the source electrode of power MOSFET S6 links to each other with the drain electrode of power MOSFET S8, and link to each other with the zero line N of output AC voltage Uo.
In the accumulator, one end of the anode of electrochemical capacitor E2 and resistance R 1 link to each other the back as output cathode+, one end of the negative electrode of electrochemical capacitor E3 and resistance R 2 link to each other the back as output negative pole-, the other end of the anode of the negative electrode of electrochemical capacitor E2, electrochemical capacitor E3, the other end of resistance R 1, resistance R 2 links to each other.
Operation principle of the present utility model is:
In the high-frequency inverter circuit, adopt conventional P WM modulation algorithm, one group of S1 and S4, one group of S2 and S3, or adopt phase shift SPWM modulation algorithm, and the low-voltage dc voltage of input can be transformed into the PWM potential pulse that first-harmonic is the high frequency low voltage of power frequency, be back level transforming circuit power supply.
In the transforming circuit, the elementary winding of the high frequency flat surface transformer of three parameter unanimities is connected successively, the first-harmonic that receives and evenly bear input is the PWM potential pulse of the high frequency low voltage of power frequency, and through electromagnetic coupled independently, exporting first-harmonic separately is the high voltagehigh frequency voltage of power frequency.
In the accumulator,, obtain half-sinusoid or square wave that first-harmonic is a power frequency by the voltage multiplying rectifier and the filter action of high speed diode and electrochemical capacitor.
In the power frequency inverter circuit, the power frequency inverter is different with even number according to the wave head odd number with half-sinusoid or square-wave voltage, and inversion becomes AC sinusoidal voltage or ac square-wave voltage.Whole device is finished the conversion by low-voltage dc voltage-High AC voltage.
Transmission electric capacity generation resonance effect between the drain-source of transforming circuit midplane transformer resonance inductance, equivalent elementary leakage inductance and power MOSFET S1～S4, by 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.The secondary employing full-wave rectifying circuit of transformer circuit medium-high frequency transformer has only a high speed diode conducting electric current simultaneously, thereby conduction loss reduces the notion of suitable low-voltage, high-current output.Accumulator adopts two electrochemical capacitors series connection solutions, helps the low-voltage electrolysis electric capacity of selecting volume less, simultaneously in order to accomplish all to press purpose, every electrochemical capacitor resistance with resistance all in parallel.In order further to raise the efficiency and to reduce volume, high frequency transformer adopts high performance flat surface transformer.
High-frequency inverter circuit of the present utility model, transforming circuit, accumulator and power frequency inverter circuit are four inseparable parts, can not analyze separately simply, thus the direct DC-AC translation circuit of formation low-voltage full-bridge inversion.The essence of operation principle is: high-frequency inverter circuit 1 is finished the conversion of direct current low amplitude value voltage to high frequency low amplitude value alternating voltage, it is the high amplitude alternating voltage of high frequency that transforming circuit is responsible for high frequency low amplitude value AC voltage conversion, and be transported to accumulator, parasitic capacitance generation resonance between the drain-source of power MOSFET in resonant inductance in the while transforming circuit and leakage inductance and the high-frequency 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.
Each resistance, diode, transformer, inductance all require to have high-performance in the above-mentioned device; The parameter of an embodiment of the utility model 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 gets 4x3300 μ F, 16V, and actual four parallel connections disperse to arrange nearby.Electrochemical capacitor E2 gets 1x47 μ F, 400V.Electrochemical capacitor E3 gets 1x47 μ F, 400V.Grading resistor R1 gets 5.1k Ω, 1W.Grading resistor R2 gets 5.1k Ω, 1W.Resistance R 3 is got 5.1k Ω, 1W.High speed diode D1～D2 is KSQ15A06B, and actual two parallel connections are installed on radiator.Power MOSFET is got IRF3205, and actual three parallel connections are installed on radiator.Ac capacitor C1～C3 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 35A.
The foregoing description just lists expressivity principle of the present utility model and effect is described, but not is used to limit the utility model.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present utility model and scope.Therefore, rights protection scope of the present utility model should be listed as claims.
Claims (5)
1. the direct DC-AC translation circuit of low-voltage input full-bridge inverting, it is characterized in that, this circuit comprise be used for low-voltage dc voltage be converted to the low-voltage alternating-current pulse voltage high-frequency inverter circuit (1), be used for the low-voltage alternating-current pulse voltage be converted to the high-voltage alternating pulse voltage transforming circuit (2), to be used for high-voltage alternating pulse voltage rectifying and wave-filtering be the accumulator (3) of high-voltage dc voltage and the power frequency inverter circuit (4) that is used for high-voltage dc voltage is reverse into industrial frequency AC sine voltage or ac square-wave voltage; Described high-frequency inverter circuit (1) comprises the power MOS pipe group, and described transforming circuit (2) comprises the elementary winding and the secondary winding that is connected with accumulator of some series connection, is provided with resonant inductance L1 between described elementary winding and the high-frequency inverter circuit (1); Described accumulator comprises the current rectifying and wave filtering circuits of 2 groups of series connection, and described current rectifying and wave filtering circuit comprises diode respectively, the electrochemical capacitor E2 that connects with diode, the capacitor C 1 in parallel with electrochemical capacitor.
2. the direct DC-AC translation circuit of a kind of low-voltage input full-bridge inverting as claimed in claim 1 is characterized in that, is parallel with resistance R on the electrochemical capacitor in the described current rectifying and wave filtering circuit.
3. the direct DC-AC translation circuit of a kind of low-voltage input full-bridge inverting as claimed in claim 1 or 2 is characterized in that, is parallel with electrochemical capacitor E1 on the power MOS pipe group in the described high-frequency inverter circuit (1).
4. the direct DC-AC translation circuit of a kind of low-voltage input full-bridge inverting as claimed in claim 3 is characterized in that described power MOS pipe group comprises four power MOSFETSs 1, MOSFETS2, MOSFETS3, MOSFETS4; Described transforming circuit (2) comprises transformer HFT1, HFT2, HFT3; Described power frequency inverter circuit (4) comprises power MOSFETS 5, power MOSFETS 6, power MOSFETS 7, power MOSFETS 8 and ac capacitor and resistance R 3;
Wherein, the drain electrode of power MOSFET S1, after linking to each other with the anode of electrochemical capacitor E1, the drain electrode of power MOSFET S2 links to each other with the positive pole of input direct voltage, the drain electrode of power MOSFET S3, after linking to each other with the negative electrode of electrochemical capacitor E1, the source electrode of power MOSFET S4 links to each other with the negative pole of input direct voltage, the drain electrode of power MOSFET S1, the drain electrode of power MOSFET S3 links to each other with the end of resonant inductance L1, and an end of the elementary winding of transformer HFT1 links to each other the drain electrode of power MOSFETS 2 in back and the transforming circuit, the drain electrode of power MOSFET S4 links to each other with an end of the elementary winding of transformer HFT3 in the transforming circuit;
The other end of primary winding HFT1 links to each other with an end of the elementary winding of transformer HFT2, and the other end of the elementary winding of transformer HFT2 links to each other with the other end of the elementary winding of transformer HFT3;
One end of one end of one end of transformer HFT1 secondary winding, transformer HFT2 secondary winding, transformer HFT3 secondary winding links to each other with the anode of accumulator high speed diode D1, the negative electrode of high speed diode D2, and the negative electrode of electrochemical capacitor E2, the anode of electrochemical capacitor E3, the end of ac capacitor C1, the end of ac capacitor C2, an end of resistance R 1, the other end of resistance R 2 link to each other in the other end of the other end of transformer HFT1 secondary winding, transformer HFT2 secondary winding, the other end of transformer HFT3 secondary winding and the accumulator;
The link to each other drain electrode of power MOSFET S5 in back and the power frequency inverter circuit, the drain electrode of power MOSFET S6 of the other end of the other end of the anode of the negative electrode of high speed diode D1, electrochemical capacitor E2, ac capacitor C1, resistance R 1 links to each other, and the other end of the negative electrode of the anode of high speed diode D2, electrochemical capacitor E3, the other end of ac capacitor C2, resistance R 2 links to each other afterwards and to link to each other with the source electrode, the source electrode of power MOSFET S8 of power MOSFET S7 in the power frequency inverter circuit;
After linking to each other with the drain electrode of power MOSFET S7, the source electrode of power MOSFET S5 links to each other with the end of ac capacitor C3, an end of resistance R 3, and link to each other with the live wire L of output AC voltage Uo, link to each other with the other end of ac capacitor C3, the other end of resistance R 3 after the source electrode of power MOSFET S6 links to each other with the drain electrode of power MOSFET S8, and link to each other with the zero line N of output AC voltage Uo.
5. the direct DC-AC translation circuit of low-voltage input full-bridge inverting as claimed in claim 4 is characterized in that transformer HFT1, HFT2, HFT3 are flat surface transformer in the described transforming circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202752236U CN201781429U (en) | 2010-07-29 | 2010-07-29 | Low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202752236U CN201781429U (en) | 2010-07-29 | 2010-07-29 | Low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion |
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| CN201781429U true CN201781429U (en) | 2011-03-30 |
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| CN2010202752236U Expired - Lifetime CN201781429U (en) | 2010-07-29 | 2010-07-29 | Low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347697A (en) * | 2010-07-29 | 2012-02-08 | 上海儒竞电子科技有限公司 | Direct DC-AC (direct current-alternating current) converting circuit for low-voltage input full bridge inverter |
| CN103986317A (en) * | 2014-05-29 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | Filter circuit with power frequency output |
| TWI479794B (en) * | 2011-08-04 | 2015-04-01 | Ablerex Electonic Co Ltd | Fifth-order dc to ac power circuit |
-
2010
- 2010-07-29 CN CN2010202752236U patent/CN201781429U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347697A (en) * | 2010-07-29 | 2012-02-08 | 上海儒竞电子科技有限公司 | Direct DC-AC (direct current-alternating current) converting circuit for low-voltage input full bridge inverter |
| CN102347697B (en) * | 2010-07-29 | 2014-01-01 | 上海儒竞电子科技有限公司 | Direct DC-AC (direct current-alternating current) converting circuit for low-voltage input full bridge inverter |
| TWI479794B (en) * | 2011-08-04 | 2015-04-01 | Ablerex Electonic Co Ltd | Fifth-order dc to ac power circuit |
| CN103986317A (en) * | 2014-05-29 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | Filter circuit with power frequency output |
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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: 20140805 |
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Effective date of registration: 20140805 Address after: 200433 room 323, No. 1101-163, National Road, Shanghai, Yangpu District Patentee after: Emerson environment optimization technology (Shanghai) Co., Ltd. Address before: 200433 Shanghai City, Yangpu District National Road No. 335 Building No. 2, 1803, 1805, 1806, 1807. Patentee before: Shanghai Ruking Electronic Science & Technology Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20110330 |
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