CN102832821A - Combined DC-DC (direct current-direct current) converter - Google Patents
Combined DC-DC (direct current-direct current) converter Download PDFInfo
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- CN102832821A CN102832821A CN2012103213513A CN201210321351A CN102832821A CN 102832821 A CN102832821 A CN 102832821A CN 2012103213513 A CN2012103213513 A CN 2012103213513A CN 201210321351 A CN201210321351 A CN 201210321351A CN 102832821 A CN102832821 A CN 102832821A
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Abstract
The invention discloses a combined DC-DC (direct current-direct current) converter and relates to the technical field of power generating inversion. N power switch tubes with the same parameter are connected in parallel beside the primary winding of a transformer; after the ends with the same name and the ends with different names on the secondary winding of the transformer are connected in series, the secondary winding is connected with a rectification circuit; absorption circuits are connected in parallel with the two ends of the power switch tubes and are connected with an energy recovery circuit; each absorption circuit consists of a capacitor and a diode; the two ends of each capacitor are connected to the two ends of the primary side of a boosting transformer in a single-ended flyback circuit; the energy recovery circuit is controlled by a 555 timer circuit; the 555 timer circuit is connected with the absorption circuits through triodes; and a filter inductor is connected to the voltage Vin input side of the primary side of the transformer. The combined DC-DC converter has the advantages that the utilization rate of solar energy and wind energy by a system is effectively improved, the wide-range and relatively low-voltage direct current output by a storage battery can be converted into stable high-voltage direct current which is provided to an inverting unit.
Description
Technical field
The present invention relates to the power-generation inversion technical field, specifically is a kind of composite type DC-DC converter.
Background technology
In the whole process of wind light mutual complementing power generation; Inverter is as the link to independent load or electrical network output electric energy; Must the direct current of accumulators store be changed into alternating current; The conversion efficiency of inverter and stable conversion efficiency and the stability that directly has influence on wind and solar hybrid generating system, so it is one of important component part of wind light mutual complementing power generation.Because the storage battery VD will can not directly be changed far below standard electric alternating current, inverter circuit is general to be realized boosting through the DC-DC converter earlier, adopts the inversion of DC-AC circuit then.Prime DC/DC converter not only will have the function of booster tension; Also should be able to be when storage battery output voltage wide variety; Offer the stable input voltage of back level inverter; And proof load also can steady operation when changing suddenly, so the DC-DC converter is one of key components of inverter.DC-DC converter commonly used at present has single-ended forward type, single-ended flyback, push-pull type etc.; But considering under the influence that high power output and wide-range voltage input are caused whole DC-DC converter; When design DC-DC converter, mainly there are following three aspect design difficulties at present:
(1) high power output
High power electric current in the switching tube that high power output is caused is a difficult problem that is faced in the DC-DC converter design always.This is because the high power electric current not only can influence the parts selection of converter, the more important thing is that the high power electric current in the switching tube will have a strong impact on the stability of whole converter.DC-DC converter with 48V/5kW is an example, supposes that it is 5kW that converter is operated in power output, under the input voltage 48V condition, can estimate the power electric current that flows through switching tube in the converter roughly and will reach more than the 100A, and peak current will be higher than 140A.This can impact the parts selection and the stability of a system undoubtedly.So, must reduce and flow through the power electric current in the switching tube through the structure of appropriate design DC-DC converter, thereby reach the purpose that improves converter stability, reduces production costs.
(2) wide-range voltage input
Wide input voltage causes DC-DC converter work change in duty cycle scope bigger; Can bring certain difficulty to the design of DC-DC converter, when the design transformer, no-load voltage ratio is generally confirmed by low pressure is fully loaded; When high pressure was imported, transformer secondary voltage platform was higher like this.Simultaneously, because the existence of transformer leakage inductance and line inductance is flow through reverse recovery current at the rectifier diode shutdown moment, will produce the higher voltage spike at the rectifier diode two ends.This is not only unfavorable to the trouble free service of rectifier diode, and because the coupling of transformer will cause that primary current increases the extra conduction loss that brings former limit main switch.
(3) storage battery High Output Current
Storage battery works long hours under than the High Output Current condition, will have a strong impact on storage battery useful life, and useful life and maintenance cost that this can increase system undoubtedly are unfavorable for the popularization and the application of wind and solar hybrid generating system.So must when design DC-DC converter control circuit, take into full account the influence of High Output Current, the storage battery output current is limited to storage battery.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the present invention provides a kind of efficient combined-type DC-DC converter, and wide region, relatively low pressure direct current that storage battery is exported convert stable high voltage direct current into, for inversion unit provides stable high voltage direct current.
The present invention realizes with following technical scheme: a kind of composite type DC-DC converter; The winding side is parallel with the identical power switch pipe of N road parameter on the former limit of transformer; Transformer secondary winding side is connected with rectification circuit after adopting end of the same name and different name end to be connected in series; The two ends of power switch pipe are parallel with the absorption circuit, absorb circuit and are connected with energy recovering circuit; Described absorption circuit is composed in series by electric capacity and diode; The two ends of electric capacity are connected two ends, the former limit of step-up transformer in the single-ended reverse exciting circuit; Described energy recovering circuit adopts the control of 555 timer circuits, and 555 timer circuits are connected with the absorption circuit through triode; Filter inductance is connected transformer original edge voltage V
InInput side.
The invention has the beneficial effects as follows: effectively improved system solar energy and utilization ratio of wind energy; Can convert wide region, the relatively low pressure direct current of storage battery output into stable high voltage direct current, for inversion unit provides stable high voltage direct current; Can effectively reduce the cost of wind and solar hybrid generating system, make it can adapt to new job requirement.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is a circuit diagram of the present invention.
Embodiment
As shown in Figure 1, physical circuit annexation of the present invention is following: storage battery V
BatAn end be connected the other end and reverse side winding N with filter inductance Lf1
P1-2Connect; The other end of filter inductance Lf1 respectively with forward side winding N
P1-1, N
P2-1, N
P3-1, N
P4-1With reverse side power switch pipe group V
1-2, V
2-2, V
3-2, V
4-2Link to each other; Forward side winding N
P1-1, N
P2-1, N
P3-1, N
P4-1Respectively with reverse side power switch pipe group V
1-2, V
2-2, V
3-2, V
4-2Be in parallel; Reverse side winding N
P1-2, N
P2-2, N
P3-2, N
P4-2Respectively with forward side power switch pipe group V
1-1, V
2-1, V
3-1, V
4-1Be in parallel; Absorb circuit C1-1 and D1-1 and be connected in parallel on forward side power switch pipe group V
1-1Two ends absorb circuit C1-2 and D1-2 and are connected in parallel on reverse side power switch pipe group V
1-2Two ends; Absorb circuit C2-1 and D2-1 and be connected in parallel on forward side power switch pipe group V
2-1Two ends absorb circuit C2-2 and D2-2 and are connected in parallel on reverse side power switch pipe group V
2-2Two ends; Absorb circuit C3-1 and D3-1 and be connected in parallel on forward side power switch pipe group V
3-1Two ends absorb circuit C3-2 and D3-2 and are connected in parallel on reverse side power switch pipe group V
3-2Two ends; Absorb circuit C4-1 and D4-1 and be connected in parallel on forward side power switch pipe group V
4-1Two ends absorb circuit C4-2 and D4-2 and are connected in parallel on reverse side power switch pipe group V
4-2Two ends; One of capacitor C 1 terminates at forward side winding N
P1-1With forward side power switch pipe group V
1-1Intersection point, the other end is connected on reverse side winding N
P1-2With reverse side power switch pipe group V
1-2Intersection point; One of capacitor C 2 terminates at forward side winding N
P2-1With forward side power switch pipe group V
2-1Intersection point, the other end is connected on reverse side winding N
P2-2With reverse side power switch pipe group V
2-2Intersection point; One of capacitor C 3 terminates at forward side winding N
P3-1With forward side power switch pipe group V
3-1Intersection point, the other end is connected on reverse side winding N
P3-2With reverse side power switch pipe group V
3-2Intersection point; One of capacitor C 4 terminates at forward side winding N
P4-1With forward side power switch pipe group V
4-1Intersection point, the other end is connected on reverse side winding N
P4-2With reverse side power switch pipe group V
4-2Intersection point; Transformer secondary winding N
S1End of the same name link to each other N with the positive pole of rectifier diode VD1
S1Different name end and N
S2End of the same name link to each other N
S2Different name end and N
S3End of the same name link to each other N
S3Different name end and N
S4End of the same name link to each other N
S4The different name end link to each other with the positive pole of rectifier diode VD3; The negative pole of rectifier diode VD1 and VD3 links to each other, and the positive pole of rectifier diode VD2 and VD4 links to each other; The positive pole of rectifier diode VD1 links to each other with the negative pole of VD2; The positive pole of rectifier diode VD3 links to each other with the negative pole of VD4; Capacitor C 5 is connected in parallel on the both sides of VD1 and VD2; The E utmost point of energy recovering circuit VT1 links to each other with the negative pole that absorbs circuit C1-1, C2-1, C3-1, C4-1, and the C utmost point of VT1 links to each other with the different name end of single-ended reverse exciting circuit N1, and the B utmost point of VT1 links to each other with the output of inverter; The end of the same name of single-ended reverse exciting circuit N1 links to each other with the positive pole that absorbs circuit C1-1, C2-1, C3-1, C4-1, and the negative pole of VD6 connects the positive pole of C5, and the positive pole of C7 connects the negative pole of VD6, the minus earth of C7; The E utmost point of VT2 links to each other with the negative pole that absorbs circuit C1-2, C2-2, C3-2, C4-2, and the C utmost point of VT2 links to each other with the different name end of single-ended reverse exciting circuit N2, and the B utmost point of VT2 links to each other with the output of inverter; The end of the same name of single-ended reverse exciting circuit N2 links to each other with the positive pole that absorbs circuit C1-2, C2-2, C3-2, C4-2, and the negative pole of VD5 connects the positive pole of C5, and the positive pole of C6 connects the negative pole of VD5, the minus earth of C6; The output of inverter connects the B utmost point of VT1 and VT2, and the input of inverter connects 3 pin of 555 timers, and 4 pin and 8 pin of 555 timers meet VCC; 1 pin ground connection of 555 timers, 6 pin of 555 timers link to each other with 2 pin and extremely link to each other with the E of Q1, and 5 pin of 555 timers link to each other with C8; The other end ground connection of C8, the C utmost point of Q1 connect 4 pin and 8 pin of 555 timers, and the B utmost point of Q1 connects between R1 and the R2; The other end ground connection of R2, the positive pole of another termination voltage-stabiliser tube VD7 of R2, the negative pole of voltage-stabiliser tube VD7 meets input voltage V0.
Operation principle
(1) to the excessive problem of high power electric current of switching tube in traditional DC-DC converter; This patent adopts the design philosophy of " parallel connection shunting ", and promptly under the condition that does not reduce power output, the power switch pipe that N road parameter is identical carries out parallel connection at the former avris of transformer; Realization is to the mean allocation of power electric current; The power electric current that single tube in original half period is flow through is assigned in N the switching tube, greatly reduces the power current value that flows through in each switching tube, is about to adopt tradition to recommend the 1/N of forward converter topological structure; Solved because the too high adverse effect that the switch parts selection is caused of current value has improved the stability of a system simultaneously.
(2) at transformer secondary high pressure outlet side; This patent adopts the design philosophy of " principle of stacking ", adopts the mode that is connected in series of " end one different name end one end of the same name of the same name ... different name end ", with transformer secondary output voltage stack output; Obtain needed high-voltage alternating voltage; When reducing single transformer power output, can effectively reduce the former secondary turn ratio of transformer, reduce the current density of Transformer Winding; Reduce the design of transformer difficulty, improve the transformer job stability simultaneously.
(3) during the converter operate as normal, the leakage inductance of elementary winding can be engraved in its two ends and produce the transient voltage spike when power switch pipe turn-offs, not breakdown in order to protect power tube, and traditional DC-DC converter generally adopts absorption circuit such as RC to fall energy consumption.Different on resistance with general absorption circuit energy consumption; With first push-pull ortho-exciting converter is example; This patent is with C1-1 and D1-1, and C1-2 and D1-2 constitute absorption circuit, are used for suppressing power tube V1-1; The instantaneous pressure that produces when V1-2 turn-offs; The energy that absorbs is collected leakage inductance energy at circuit through C1-1, C1-2, and the energy that utilizes energy recovering circuit to collect the power tube two ends is fed on the dc bus after passing through single-ended reverse exciting circuit N1, N2 boosting inverter, thereby improves the operating efficiency of DC-DC converter effectively.
(4) difference of this patent and traditional DC-DC converter is filter inductance has been moved on to transformer original edge voltage V from the rectifier diode rear side
InInput side.Because inductance directly is connected on input and surveys, thereby continuous input current, current ripples is little, helps improving the efficient and the working life of storage battery; Transformer secondary output does not have the afterflow inductance in addition, thereby the secondary buffering circuit can omit, and circuit structure is simpler, helps reducing cost.
The course of work
1. stage 1 [t
0-t
1]
t
0Beginning, drive signal Driver1 is a high level, Driver2 is a low level, thereby makes V1-1, V2-1, V3-1, V4-1 all are in conducting state.After the accumulator direct current supply process output inductor Lf1 filtering; Its direct current power electric current is carried out the parallel connection shunting; Import four groups of forward side windings simultaneously; This moment, all can produce magnitude of voltage was n * Vp1 magnetic induction electromotive force at every group of secondary winding of transformer two ends, and wherein n is the former secondary turn ratio of transformer.Because the transformer secondary adopts the mode that is connected in series of " end one different name end one end of the same name of the same name ... different name end ", will produce an electromotive force V by the high voltage of 4 Transformer Winding magnetic induction electromotive force stack generations
StAt the rectification outlet side, rectifier diode VD2, the VD3 conducting, after C5 filtering, the output high voltage direct current is until t
1Drive signal Driver1 reduces to low level constantly, forward side switching tube group V1-1, and V2-1, V3-1, V4-1 turn-offs, and the stage 1 finishes.
2. stages 2 [t
1-t
2]
At t
1After finishing constantly, drive signal Driver1 and Driver2 all reduce to low level, make V1-1, V2-1, and V3-1, V4-1 recovers off state, and this moment, all switching tubes all were in off state.The loop circulation that the primary current of transformer constitutes along low-tension supply, positive and negative phase winding and coupling capacitance, at the rectification outlet side, rectifier diode VD1, the VD4 conducting, after C5 filtering, the output high voltage direct current is until t
2Drive signal Driver2 reduces to low level constantly, reverser pipe group V1-2, and V2-2, V3-2, the V4-2 conducting, the stage 2 finishes.
3. stages 3 [t
2-t
3]
T
2Beginning, drive signal Driver1 is a low level, Driver2 is a high level, thereby makes V1-2, V2-2, V3-2, V4-2 all are in conducting state.After the accumulator direct current supply process output inductor Lf1 filtering; Its direct current power electric current is carried out the parallel connection shunting; Import four groups of reverse side windings simultaneously; This moment, all can produce magnitude of voltage was n * Vp1 magnetic induction electromotive force at every group of secondary winding of transformer two ends, and wherein n is the former secondary turn ratio of transformer.Because the transformer secondary adopts the mode that is connected in series of " end one different name end one end of the same name of the same name ... different name end ", will produce an electromotive force V by the high voltage of 4 Transformer Winding magnetic induction electromotive force stack generations
StAt the rectification outlet side, rectifier diode VD2, the VD3 conducting, after C5 filtering, the output high voltage direct current is until t
1Drive signal Driver2 reduces to low level constantly, reverse side switching tube group V1-2, and V2-2, V3-2, V4-2 turn-offs, and the stage 3 finishes.
4. stages 4 [t
3-t
4]
5. energy recovering circuit control procedure
When the voltage of input Vo was higher than set point, voltage-stabiliser tube VD7 was breakdown, triode Q1 conducting; 2 pin of 555 timers and 6 pin are high level, and 555 timers, 3 pin output low levels are again through negative circuit output high level; Drive VT1 and VT2 conducting, energy recovering circuit is started working; Otherwise Q1 turn-offs, and 555 timers, 3 pin output high level again through the negative circuit output low level, drives VT1 and VT2 and ends, and energy recovering circuit quits work.
Claims (1)
1. composite type DC-DC converter; It is characterized in that: the winding side is parallel with the identical power switch pipe of N road parameter on the former limit of transformer; Transformer secondary winding side is connected with rectification circuit after adopting end of the same name and different name end to be connected in series; The two ends of power switch pipe are parallel with the absorption circuit, absorb circuit and are connected with energy recovering circuit; Described absorption circuit is composed in series by electric capacity and diode; The two ends of electric capacity are connected two ends, the former limit of step-up transformer in the single-ended reverse exciting circuit; Described energy recovering circuit adopts the control of 555 timer circuits, and 555 timer circuits are connected with the absorption circuit through triode; Filter inductance is connected transformer original edge voltage V
InInput side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210321351.3A CN102832821B (en) | 2012-09-03 | 2012-09-03 | Combined DC-DC (direct current-direct current) converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210321351.3A CN102832821B (en) | 2012-09-03 | 2012-09-03 | Combined DC-DC (direct current-direct current) converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102832821A true CN102832821A (en) | 2012-12-19 |
| CN102832821B CN102832821B (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210321351.3A Expired - Fee Related CN102832821B (en) | 2012-09-03 | 2012-09-03 | Combined DC-DC (direct current-direct current) converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110073585A (en) * | 2016-12-22 | 2019-07-30 | 斯兰纳亚洲有限公司 | Accessory power supply for switched-mode power supply |
| CN112170148A (en) * | 2020-08-18 | 2021-01-05 | 华南农业大学 | Ultrasonic power direct current bias pulse excitation power supply |
| CN112968621A (en) * | 2021-02-17 | 2021-06-15 | 青岛大学 | Single-stage composite active clamping push-pull flyback inverter |
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| US5914865A (en) * | 1997-10-23 | 1999-06-22 | Hewlett-Packard Company | Simplified AC-DC switching converter with output isolation |
| US20070109827A1 (en) * | 2003-12-10 | 2007-05-17 | Delacruz Moises | Ac to dc converter circuit |
| CN101795063A (en) * | 2010-03-26 | 2010-08-04 | 华东交通大学 | Low loss energy-regenerative type clamping circuit and drive control method |
| CN102361403A (en) * | 2011-06-13 | 2012-02-22 | 珠海泰坦新能源系统有限公司 | Staggered series direct current (DC)/DC converter circuit |
| CN102638164A (en) * | 2012-05-03 | 2012-08-15 | 无锡联动太阳能科技有限公司 | High boost circuit, solar inverter and solar cell system |
-
2012
- 2012-09-03 CN CN201210321351.3A patent/CN102832821B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5914865A (en) * | 1997-10-23 | 1999-06-22 | Hewlett-Packard Company | Simplified AC-DC switching converter with output isolation |
| US20070109827A1 (en) * | 2003-12-10 | 2007-05-17 | Delacruz Moises | Ac to dc converter circuit |
| CN101795063A (en) * | 2010-03-26 | 2010-08-04 | 华东交通大学 | Low loss energy-regenerative type clamping circuit and drive control method |
| CN102361403A (en) * | 2011-06-13 | 2012-02-22 | 珠海泰坦新能源系统有限公司 | Staggered series direct current (DC)/DC converter circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110073585A (en) * | 2016-12-22 | 2019-07-30 | 斯兰纳亚洲有限公司 | Accessory power supply for switched-mode power supply |
| CN110073585B (en) * | 2016-12-22 | 2021-08-10 | 阿帕尔斯电力股份有限公司 | Auxiliary power supply for a switched mode power supply |
| CN112170148A (en) * | 2020-08-18 | 2021-01-05 | 华南农业大学 | Ultrasonic power direct current bias pulse excitation power supply |
| CN112968621A (en) * | 2021-02-17 | 2021-06-15 | 青岛大学 | Single-stage composite active clamping push-pull flyback inverter |
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| CN102832821B (en) | 2015-05-13 |
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