CN202818141U - Inverter power supply suitable for low voltage battery power supply - Google Patents
Inverter power supply suitable for low voltage battery power supply Download PDFInfo
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- CN202818141U CN202818141U CN201220488865.3U CN201220488865U CN202818141U CN 202818141 U CN202818141 U CN 202818141U CN 201220488865 U CN201220488865 U CN 201220488865U CN 202818141 U CN202818141 U CN 202818141U
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Abstract
The utility model relates to an inverter power supply suitable for the low voltage battery power supply. The inverter power supply is characterized in that the inverter power supply is composed of a pre-stage DC/DC isolation boost circuit and a post-stage DC/AC circuit; the pre-stage DC/DC isolation boost circuit adopts a boost-type push-pull converter which can effectively reduce the input current pulsation, and the battery utilization rate is improved; and at the same time, the voltage-second product added on a transformer primary side winding is reduced, and the magnetic imbalance of the transformer is automatically inhibited; the post-stage DC/AC inverter circuit is provided with multiple inverter units, and each inverter unit is connected in series with a current-sharing inductor and then is connected with a load; each inverter unit is composed of two bridge arms which are connected in parallel, two filtering inductors, two filtering capacitors, and a coupling capacitor. The voltage stress of a power device is effectively reduced, the circuit reliability is improved, the input current pulsation is reduced, and the battery output power fluctuation scope is reduced. The inverter power supply is simple in structure, is stable in performance, and is easy to control.
Description
Technical field
The utility model relates to the Technics of Power Electronic Conversion field, particularly a kind of battery-powered inverter of low tension that is applicable to.
Background technology
Along with the increase of power consumption and the people attention to biological environment, the green energy resources such as fuel cell and solar energy receive increasing concern.The electricity that fuel cell and solar energy send is the direct voltage that excursion is wider, amplitude is lower.This class low-voltage DC is transformed to the emphasis that stable alternating current is the green energy resource application study---low pressure inversion transformation technique, is about to the low-voltage DC that fuel cell and solar cell send and is transformed to the alternating currents such as 115V/400Hz, 110V/50Hz and 220V/50Hz by the high-frequency inversion technology.
The low pressure inversion transformation technique adopts the DC/DC+DC/AC two-layer configuration more at present.The traditional push-pull circuit of the many uses of prime DC/DC, the input current pulsation is larger, causes the output-power fluctuation scope of solar cell or fuel cell large, is difficult to adapt to the slower response speed of battery, has reduced the utilance of battery.Rear class DC/AC uses H bridge circuit topology to add electric current closed loop formation more, and prime dc voltage value is higher, thereby so that the voltage stress that power tube bears is high; Also need to solve the problems such as parallel current-sharing and circulation when needing larger electric current.
Summary of the invention
The technical problems to be solved in the utility model is for the deficiencies in the prior art, proposed a kind of simple in structure, stable performance and be easy to control be applicable to the battery-powered inverter of low tension.
The technical problems to be solved in the utility model is achieved through the following technical solutions, and a kind of battery-powered inverter of low tension that is applicable to is characterized in: be made of DC/DC isolation boosting circuit and DC/AC circuit two-stage; Prime DC/DC isolation boosting circuit adopts boost type push-pull converter; Rear class DC/AC inverter circuit is provided with several inversion units, after each inversion unit is connected with a current sharing inductor and the load composition that joins; Each inversion unit is comprised of the brachium pontis of two parallel connections, two filter inductances, two filter capacitors and a coupling capacitance, the input of two brachium pontis all is connected in parallel on the output bus two ends of DC/DC isolation boosting circuit, two filter inductances and two filter capacitors consist of respectively two pairs of LC filtering, two filter inductance one ends are connected to the mid point of corresponding brachium pontis, connect the mid point of output bus after the one end parallel connection of two filter capacitors, the coupling capacitance two ends are connected to the mid point of two pairs of LC filtering.
The technical problems to be solved in the utility model can also come further to realize that prime DC/DC isolation boosting circuit comprises push-pull circuit by the following technical programs, is serially connected with filter inductance to consist of boost type push-pull converter at the input of push-pull circuit.
The technical problems to be solved in the utility model can also be come further to realize by the following technical programs, two power tubes of same brachium pontis drive the respectively alternately output in half period of SPWM waveform, the carrier phase of the SPWM drive waveforms between two brachium pontis differs 180 °, exports by coupling capacitance after the two brachium pontis copped waves.
The technical problems to be solved in the utility model can also be come to realize that further load is in parallel with an output filter capacitor by the following technical programs.
The technical problems to be solved in the utility model can also be come by the following technical programs further to realize, adopt phase shift modulation between several inversion units.
Prime DC/DC isolation boosting circuit of the present utility model adopts boost type push-pull converter.The input filter inductance that seals in has very high transient impedance, can effectively reduce the input current pulsation, thereby reduce battery power output excursion, has improved the utilance of battery; Attempt to enter owing to magnetic is uneven when saturated when magnetic core of transformer simultaneously, it absorbs more electric current, can produce larger pressure drop at the input filter inductance, thereby reduces to be added in the voltagesecond product on the transformer primary side winding, and the magnetic that automatically suppresses transformer is uneven.
Each inversion unit and current sharing inductor form an element circuit, are conducive to reduce inverter parallel circulation, also are conducive to improve simultaneously the stability of current feedback link.Between a plurality of inversion units, adopt the phase-shifting carrier wave modulation, thereby reduce total current harmonic content.The Sine Modulated copped wave of two brachium pontis output is the sine wave of 180 ° of two phase phasic differences after LC filtering, like this, the busbar voltage of prime just can be reduced to half of the required direct voltage of independent brachium pontis inversion, thereby effectively reduced the voltage stress of all power tubes in the prime DC/DC booster circuit, improved the reliability of circuit.
Compared with prior art, the utility model current type low pressure inverter circuit have simple in structure, be easy to control, power device voltage stress is little and the characteristics such as stable performance.Can be used for improving the application portability of the green energy resources such as solar cell, fuel cell.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in the figure: among the figure: 1, DC/DC isolation boosting translation circuit, 2, single brachium pontis, 3, inversion unit, 4, load.La is DC/DC level input filter inductance, and Lb is DC/DC level output inductor, and Ca is DC/DC level input filter capacitor, and Cb, Cd are DC/DC level output filter capacitor; Va, Vb, V11-V14Vn1-Vn4 are switching device, and D1-D4 is diode, and L11-L12Ln1-Ln2 is the inversion unit filter inductance, C11-C12Cn1-Cn2 is the inversion unit filter capacitor, C1Cn is the inversion unit coupling capacitance, and L1Ln is the output current sharing inductor, and Ce is for exchanging output filter capacitor.
A kind of battery-powered inverter of low tension that is applicable to is made of DC/DC isolation boosting circuit and DC/AC circuit two-stage; Prime DC/DC isolation boosting circuit comprises push-pull circuit, is serially connected with filter inductance to consist of boost type push-pull converter at the input of push-pull circuit.
Rear class DC/AC inverter circuit is provided with several inversion units, after each inversion unit is connected with a current sharing inductor and the load composition that joins; Each inversion unit is comprised of the brachium pontis of two parallel connections, two filter inductances, two filter capacitors and a coupling capacitance, the input of two brachium pontis all is connected in parallel on the output bus two ends of DC/DC isolation boosting circuit, two filter inductances and two filter capacitors consist of respectively two pairs of LC filtering, two filter inductance one ends are connected to the mid point of corresponding brachium pontis, connect the mid point (centre cap of DC/DC secondary winding) of output bus after the one end parallel connection of two filter capacitors, the coupling capacitance two ends are connected to the mid point of two pairs of LC filtering.
Load is in parallel with an output filter capacitor.One of current sharing inductor terminates at the coupling capacitance upper end (upper end refers to drive that end that the identical brachium pontis of carrier phase links to each other by inductance with SPWM) of inversion unit, links to each other with load with output filter capacitor after the other end parallel connection of each current sharing inductor.Link to each other with the coupling capacitance lower end after the other end parallel connection of output filter capacitor and load.
Described brachium pontis is single brachium pontis, and two power tubes of same brachium pontis drive the respectively alternately output in half period of SPWM waveform, and the carrier phase of the SPWM drive waveforms between two brachium pontis differs 180 °, exports by coupling capacitance after the two brachium pontis copped waves.
Prime DC/DC isolation boosting circuit is comprised of input filter inductance, input filter capacitor, power switch Va and Vb, push-pull transformer, output rectifier diode and output inductor electric capacity.The time of adopting traditional pulse-width modulation (PWM) to come conducting and the shutoff of power ratio control switching tube, when making load variations, output voltage remains unchanged substantially.The rear class winding of DC/DC isolation boosting converter unit is extracted center head out, provides balanced generating positive and negative voltage for the rear class inversion unit easily.
After having sealed in the input filter inductance, when two power switch pipes all turn-offed, inductive current continued to filter capacitor Ca(appearance value very large) charging, can reduce the input current pulsation effectively, thereby reduce battery power output excursion, improved the utilance of battery; Weak point has been to improve the voltage stress of power switch pipe, but because its original voltage stress is just lower, or acceptable.Attempt to enter owing to magnetic is uneven when saturated when magnetic core of transformer simultaneously, it absorbs more electric current, can produce larger pressure drop at the input filter inductance, thereby reduce to be added in the voltagesecond product on the transformer primary side winding, realize that the magnetic of inhibition transformer is uneven automatically.
The current inversion unit can have several, all is in parallel at input between them, and namely the input positive voltage of each unit, center line and input negative voltage are same tie points.Be connected with a current sharing inductor Ln in the back of each inversion unit, the other end of current sharing inductor L1Ln all is connected in parallel, and receives output loading.Current sharing inductor L1Ln is conducive to reduce inverter parallel circulation, also is conducive to improve simultaneously the stability of current feedback link.
Between a plurality of inversion units, adopt the phase-shifting carrier wave modulation, thereby reduce total current harmonic content.
Claims (5)
1. one kind is applicable to the battery-powered inverter of low tension, it is characterized in that: be made of DC/DC isolation boosting circuit and DC/AC circuit two-stage; Prime DC/DC isolation boosting circuit adopts boost type push-pull converter; Rear class DC/AC inverter circuit is provided with several inversion units, after each inversion unit is connected with a current sharing inductor and the load composition that joins; Each inversion unit is comprised of the brachium pontis of two parallel connections, two filter inductances, two filter capacitors and a coupling capacitance, the input of two brachium pontis all is connected in parallel on the output bus two ends of DC/DC isolation boosting circuit, two filter inductances and two filter capacitors consist of respectively two pairs of LC filtering, two filter inductance one ends are connected to the mid point of corresponding brachium pontis, connect the mid point of output bus after the one end parallel connection of two filter capacitors, the coupling capacitance two ends are connected to the mid point of two pairs of LC filtering.
2. the battery-powered inverter of low tension that is applicable to according to claim 1, it is characterized in that: prime DC/DC isolation boosting circuit comprises push-pull circuit, is serially connected with filter inductance to consist of boost type push-pull converter at the input of push-pull circuit.
3. the battery-powered inverter of low tension that is applicable to according to claim 1, it is characterized in that: two power tubes of same brachium pontis drive the respectively alternately output in half period of SPWM waveform, the carrier phase of the SPWM drive waveforms between two brachium pontis differs 180 °, exports by coupling capacitance after the two brachium pontis copped waves.
4. the battery-powered inverter of low tension that is applicable to according to claim 1, it is characterized in that: load is in parallel with an output filter capacitor.
5. the battery-powered inverter of low tension that is applicable to according to claim 1 is characterized in that: adopt phase shift modulation between several inversion units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220488865.3U CN202818141U (en) | 2012-09-24 | 2012-09-24 | Inverter power supply suitable for low voltage battery power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220488865.3U CN202818141U (en) | 2012-09-24 | 2012-09-24 | Inverter power supply suitable for low voltage battery power supply |
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| CN202818141U true CN202818141U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220488865.3U Expired - Lifetime CN202818141U (en) | 2012-09-24 | 2012-09-24 | Inverter power supply suitable for low voltage battery power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280979A (en) * | 2013-06-27 | 2013-09-04 | 电子科技大学 | Push-pull output switch power supply |
| CN105047387A (en) * | 2015-06-29 | 2015-11-11 | 惠州市英华电源有限公司 | Transformer and inverter |
| CN115441727A (en) * | 2022-09-20 | 2022-12-06 | 苏州悉智科技有限公司 | Converter system |
| CN116317664A (en) * | 2023-03-10 | 2023-06-23 | 南京航空航天大学 | Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output |
-
2012
- 2012-09-24 CN CN201220488865.3U patent/CN202818141U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280979A (en) * | 2013-06-27 | 2013-09-04 | 电子科技大学 | Push-pull output switch power supply |
| CN103280979B (en) * | 2013-06-27 | 2016-01-20 | 电子科技大学 | Recommend output switch power source |
| CN105047387A (en) * | 2015-06-29 | 2015-11-11 | 惠州市英华电源有限公司 | Transformer and inverter |
| CN115441727A (en) * | 2022-09-20 | 2022-12-06 | 苏州悉智科技有限公司 | Converter system |
| CN116317664A (en) * | 2023-03-10 | 2023-06-23 | 南京航空航天大学 | Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output |
| CN116317664B (en) * | 2023-03-10 | 2023-10-13 | 南京航空航天大学 | Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output |
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20220121 Address after: 200120 building C, No. 888, Huanhu West 2nd Road, Lingang New Area, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: SHANGHAI JIERUIZHAO NEW INFORMATION TECHNOLOGY CO.,LTD. Address before: 222000 No. 42, Hailian East Road, Xinpu District, Lianyungang City, Jiangsu Province Patentee before: LIANYUNGANG JIERUI ELECTRONIC Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130320 |