CN203674985U - High-efficiency DC-DC converter - Google Patents
High-efficiency DC-DC converter Download PDFInfo
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- CN203674985U CN203674985U CN201320890999.2U CN201320890999U CN203674985U CN 203674985 U CN203674985 U CN 203674985U CN 201320890999 U CN201320890999 U CN 201320890999U CN 203674985 U CN203674985 U CN 203674985U
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Abstract
The utility model relates to a high-efficiency DC-DC converter. The DC-DC converter comprises a first full bridge, a second full bridge and a third full bridge of identical structures. Arms of the full bridges are connected with an input power supply in parallel, and the phase difference between the bridges is 120 degree. An upper bridge tube of the leading bridge arm is driven at first, and a lower bridge tube is driven after the upper bridge tube for half a period; and an upper bridge tube of the lagging bridge arm is driven after the upper bridge tube of the leading bridge arm for a time X. Due to five states of energy transmission of each order, one to two phases of each of the full bridges work, current in the whole process is shared by the working full bridges, and the current load of the single full bridge is reduced. The circuit loss is effectively reduced, the problem that traditional full bridges are limited by current in large power is solved, and the current-resistant requirement for devices is lowered. Due to the soft switching state in part of a period, loss of the switching tubes caused by hard switching is reduced, and the conversion efficiency of the DC-DC converter is therefore improved.
Description
Technical field
The utility model relates to a kind of voltage changer, is specifically related to a kind of high efficiency DC-DC converter.
Background technology
In the low pressure such as solar power system, fuel cell generation, large electric current electric power system, DC-to-DC (DC-DC) converter can become fixing DC voltage conversion the variable direct voltage line output of going forward side by side, because of but realize that energy dress changes, the crucial execution unit of transfer overvoltage electric current and power control.The working method of traditional DC-DC converter using hard switching, the factor that affects hard switching DC-DC converter operating efficiency is mainly the loss of switching tube.The loss of switching tube is mainly divided into two parts, and the one, in the process turning on and off, due to voltage and current time, there is the loss of cut-offfing producing in switching tube; But in the time that switching tube is opened, because the existence of itself conducting resistance and the conduction loss that produces.
Current DC-DC converter is mainly taking the form of single-phase full bridge topology as main, and it has the advantages that control mode is flexible, power grade is high, can reach good efficiency in the step-down occasion of the little electric current input of high voltage.If but when this full-bridge type DC-DC converter is directly applied to the occasion of low-voltage, high-current input, because electric current increases the conduction loss multiplication that causes switching tube, therefore be difficult to reach expection conversion efficiency, and along with power grade further increases, when electric current further increases, the resistance to stream to device and heat radiation require just more and more higher.
Utility model content
The utility model is for the deficiencies in the prior art, having proposed a kind of no-voltage that can simultaneously realize switching tube opens with zero current turning-on, closes, can solve conventional full bridge in the current limit problem of doing when high-power, and can realize small size, the resistance to stream of device is required to low high efficiency DC-DC converter.
The technical solution of the utility model is as follows:
A kind of high efficiency DC-DC converter, it is characterized in that: it comprises the first full-bridge, the second full-bridge and the 3rd full-bridge that structure is identical, each full-bridge comprises two brachium pontis in parallel and a transformer, and described brachium pontis is made up of the switching tube of two series windings, and described brachium pontis is all in parallel with input power; In described same brachium pontis, driving the leading switching tube of signal is to manage on bridge, and driving the switching tube of signal lag is to manage under bridge, and in described full-bridge, driving the leading brachium pontis of signal is leading-bridge, and driving the brachium pontis of signal lag is lagging leg; Described in the electrode input end sub-connection of described transformer between two switching tubes of leading-bridge, described in negative input sub-connection between two switching tubes of lagging leg;
Phase phasic difference 120 between described the first full-bridge, the second full-bridge and the 3rd full-bridge is spent; On the bridge of described leading-bridge, Guan Xianfa drives, and under described bridge, pipe drives than pipe time delay half period on described bridge; On the bridge of lagging leg, pipe drove than the X time of pipe time delay on the bridge of leading-bridge.
The span of described X should be between 60-120 °.
The output of described transformer successively connects a rectification circuit and a LC filter circuit.
Described rectification circuit comprises three groups of parallel circuitss, and every group of circuit comprises the diode of two series windings.
The negative terminal of the secondary coil of the transformer of described the first full-bridge, the second full-bridge and the 3rd full-bridge links together.
The secondary coil positive terminal of described transformer be connected to two described between diode.
Described switching tube is field effect transistor.
Technique effect of the present utility model is as follows:
The high efficiency DC-DC converter of one of the present utility model, comprises the first full-bridge, the second full-bridge and the 3rd full-bridge that structure is identical, and the brachium pontis of the full-bridge all phase phasic difference 120 between and the first full-bridge, the second full-bridge and the 3rd full-bridge in parallel with input power is spent; On the bridge of leading-bridge, Guan Xianfa drives, and under bridge, pipe is sent out driving than pipe time delay half period on bridge; On the bridge of lagging leg, pipe drove than the X time of pipe time delay on the bridge of leading-bridge.Due to 5 states that transmit for every rank energy, in the first full-bridge, the second full-bridge and the 3rd full-bridge, all have at least a phase, maximum two-phase to carry out work, in whole process, electric current is shared by the full-bridge of working simultaneously like this, reduce the current capacity of single full-bridge, not only effectively reduce circuit loss, also solve conventional full bridge in the current limit problem of doing when high-power, but also reduced the resistance to stream requirement of device.
Due to switching tube (SA2P, SA2N, the SB2P of lagging leg, SB2N, SC2P, SC2N) to realize no-voltage open-minded, switching tube (SA1P, SA1N, the SB1P of leading-bridge, SB1N, SC1P, SC1N) realize zero-current switching and zero current turning-on, therefore DC-DC converter of the present utility model can be realized soft on off state in the whole process period, so just reduce the switching tube loss being brought by the hard switching state of switching tube, thereby improved the conversion efficiency of DC-DC converter.
Brief description of the drawings
Fig. 1 is DC-DC converter topology structure chart of the present utility model
Fig. 2 is DC-DC convertor controls sequential chart of the present utility model
Fig. 3 is first stage circuit diagram of the present utility model
Fig. 4 is second stage circuit diagram of the present utility model
Fig. 5 is phase III circuit diagram of the present utility model
Fig. 6 is fourth stage circuit diagram of the present utility model
Fig. 7 is five-stage circuit diagram of the present utility model
Embodiment
Below in conjunction with accompanying drawing, the utility model is described.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Specific embodiment described herein is only in order to explain the utility model, and is not used in restriction the utility model.
The input of DC-DC converter of the present utility model comprises three full-bridges that structure is identical, and wherein each full-bridge comprises two brachium pontis and a single-phase transformer, and each brachium pontis is made up of the switching tube of two series windings, and the brachium pontis of all full-bridges is all in parallel with input power; The input terminal of transformer is connected between the switching tube of brachium pontis, and output voltage carries out rectification through a rectification circuit being made up of diode, again through the filtering of a LC filter circuit, has so just obtained required VD afterwards.
The utility model will drive the leading brachium pontis of signal to be called leading-bridge in same full-bridge, drive the brachium pontis of signal lag to be called lagging leg; Manage driving the leading switching tube of signal to be called on bridge in same brachium pontis, the switching tube of driving signal lag is called under bridge manages.The positive terminal of primary of transformer is connected between two switching tubes of leading-bridge, and negative terminal is connected between two switching tubes of lagging leg; The positive terminal of secondary coil is connected between two diodes of rectification circuit, and the negative terminal of three full-bridges links together.
Because all duty ratios of switching tube are all 50%, need to leave certain Dead Time, for the first full-bridge, on the bridge of leading-bridge, Guan Xianfa drives, under bridge, pipe drives than pipe time delay half period on bridge, and on the bridge of lagging leg, pipe drove than the X time of pipe time delay on the bridge of leading-bridge; The second full-bridge, the 3rd full-bridge are the same with the first full-bridge, under bridge, on pipe, bridge, between pipe, differ half period, on the bridge of lagging leg, on the bridge of pipe, leading-bridge, between pipe, differ an X time; The first full-bridge, the second full-bridge, the 3rd full-bridge, the phase phasic difference 120 between each full-bridge is spent.The no-voltage (ZVS) that realizes thus switching tube opens and zero current (ZCS) is opened and closed.Because the X time is to determine according to the output voltage V out of expection, therefore the larger output voltage V out of X is higher, and the less output voltage V out of X is lower.The span of X of the present utility model should be between 60-120 °, and output voltage V out is between NVin and 2NVin like this, and wherein N represents the turn ratio of transformer.The general booster system of contrast like this, the turn ratio of transformer also can reduce design time, and then also can further raise the efficiency.
As shown in Figure 1, by managing SA1P on the first leading bridge, under the first leading bridge, manage SA1N, on the first hysteresis bridge, manage SA2P, under the first hysteresis bridge, manage SA2N and form leading-bridge and the lagging leg of the first full-bridge A, by managing SB1P on the second leading bridge, under the second leading bridge, manage SB1N, on the second hysteresis bridge, manage SB2P, under the second hysteresis bridge, manage SB2N and form leading-bridge and the lagging leg of the second full-bridge B, by managing SC1P on the 3rd leading bridge, under the 3rd leading bridge, manage SC1N, on the 3rd hysteresis bridge, manage SC2P, under the 3rd hysteresis bridge, manage leading-bridge and the lagging leg of SC2N composition the 3rd full-bridge C.
As shown in Figure 2,6 brachium pontis control signal of totally 12 switching tubes, 1-24 is a complete switch periods, and wherein 1-5 is the first rank energy transmission, and the first full-bridge A and the 3rd full-bridge C are open-minded, and energy is delivered to the 3rd full-bridge C from the second full-bridge B; 6-11 is the transmission of second-order energy, and the second full-bridge B is open-minded, and energy is delivered to the second full-bridge B from the first full-bridge A and the 3rd full-bridge C; 12-17 is the 3rd rank energy transmission, and the first full-bridge A and the 3rd full-bridge C are open-minded, and energy is delivered to first full-bridge A and the 3rd full-bridge C from second full-bridge B; 18-23 is the transmission of quadravalence energy, and the second full-bridge B is open-minded, and energy is delivered to second full-bridge B from first full-bridge A and the 3rd full-bridge C.
Because the identical just electric current of principle of the first rank energy transmission, the transmission of second-order energy, the 3rd rank energy transmission and the transmission of quadravalence energy is not shifting between homophase, therefore only set forth as an example of the first rank energy transmission example.The first rank energy transmission is divided into again double teacher:
As shown in Figure 3, the control sequential of first stage is: on the first leading bridge, manage under SA1P, the first hysteresis bridge, to manage on SA2N, the second hysteresis bridge, to manage under SB2P, the second leading bridge, to manage to manage on SB1N, the 3rd leading bridge and on SC1P, the 3rd hysteresis bridge, manage SC2P and open, now the flow direction of electric current as shown in Figure 3.Owing to managing on SC1P and the 3rd hysteresis bridge and managing SC2P all open-minded on the 3rd leading bridge, so do not have electric current to flow through in the 3rd full-bridge C, jointly provide electric current to load by the first full-bridge A and the second full-bridge B, a full-bridge provides half.
As shown in Figure 4, the control sequential of second stage is: on the first leading bridge, manage under SA1P, the first hysteresis bridge, to manage under SA2N, the second leading bridge, to manage to manage on SB1N, the 3rd leading bridge and on SC1P, the 3rd hysteresis bridge, manage SC2P and open, on the second hysteresis bridge, manage SB2P and turn-off, under the second hysteresis bridge, manage SB2N and prepare open-minded.First turn-off owing to managing SB2P on the second hysteresis bridge, in the second full-bridge B, inductance will maintain electric current continuation stream, so the voltage that B2 is ordered reduces gradually, until manage the conducting of body diode in SB2N nature under the second hysteresis bridge, make to manage under the second hysteresis bridge SB2N no-voltage open-minded.
As shown in Figure 5, the control sequential of three phases is: on the first leading bridge, manage under SA1P, the first hysteresis bridge, to manage under SA2N, the second leading bridge, to manage under SB1N, the second hysteresis bridge, to manage to manage on SB2N, the 3rd leading bridge and on SC1P, the 3rd hysteresis bridge, manage SC2P and open.Now the second full-bridge B the inside does not have electric current, only has the first full-bridge A to load transfer energy.
As shown in Figure 6, the control sequential of four-stage is: on the first leading bridge, manage under SA1P, the first hysteresis bridge, to manage under SA2N, the second leading bridge, to manage to manage under SB1N, the second hysteresis bridge and on SB2N, the 3rd hysteresis bridge, manage SC2P and open, manage SC1P preparation and turn-off on the 3rd leading bridge.At this moment the 3rd full-bridge C the inside does not have electric current, is zero-current switching so manage the shutoff of SC1P on the 3rd leading bridge.
As shown in Figure 7, the control sequential of double teacher is: on the first leading bridge, manage under SA1P, the first hysteresis bridge, to manage under SA2N, the second leading bridge, to manage to manage under SB1N, the second hysteresis bridge and on SB2N, the 3rd hysteresis bridge, manage SC2P and open, manage SC1P preparation open-minded on the 3rd leading bridge.Now the 3rd full-bridge C the inside only has the very little electric current to economize on electricity capacity charge, is almost zero current turning-on so at this moment manage opening of SC1P on the 3rd leading bridge.On the 3rd leading bridge, manage SC1P open after the first full-bridge A and the 3rd full-bridge C jointly provide electric current to load, a full-bridge provides half, energy realization is delivered to the 3rd full-bridge C from the second full-bridge B.
It should be pointed out that the above embodiment can make those skilled in the art's comprehend the utility model create, and creates but limit never in any form the utility model.Therefore; although this specification is created and is had been described in detail the utility model with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can create and modify or be equal to replacement the utility model; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the utility model creation, and it all should be encompassed in the utility model and create in the middle of the protection range of patent.
Claims (7)
1. a high efficiency DC-DC converter, it is characterized in that: it comprises the first full-bridge, the second full-bridge and the 3rd full-bridge that structure is identical, each full-bridge comprises two brachium pontis in parallel and a transformer, and described brachium pontis is made up of the switching tube of two series windings, and described brachium pontis is all in parallel with input power; In described brachium pontis, driving the leading switching tube of signal is to manage on bridge, and driving the switching tube of signal lag is to manage under bridge, and in described full-bridge, driving the leading brachium pontis of signal is leading-bridge, and driving the brachium pontis of signal lag is lagging leg; Described in the electrode input end sub-connection of described transformer between two switching tubes of leading-bridge, described in negative input sub-connection between two switching tubes of lagging leg;
Phase phasic difference 120 between described the first full-bridge, the second full-bridge and the 3rd full-bridge is spent; On the bridge of described leading-bridge, Guan Xianfa drives, and under described bridge, pipe drives than pipe time delay half period on described bridge; On the bridge of lagging leg, pipe drove than the X time of pipe time delay on the bridge of leading-bridge.
2. the high efficiency DC-DC converter of one as claimed in claim 1, is characterized in that: the span of described X should be between 60-120 °.
3. the high efficiency DC-DC converter of one as claimed in claim 1, is characterized in that: the output of described transformer successively connects a rectification circuit and a LC filter circuit.
4. the high efficiency DC-DC converter of one as claimed in claim 3, is characterized in that: described rectification circuit comprises three groups of parallel circuitss, and every group of circuit comprises the diode of two series windings.
5. the high efficiency DC-DC converter of one as claimed in claim 1, is characterized in that: the negative terminal of the secondary coil of the transformer of described the first full-bridge, the second full-bridge and the 3rd full-bridge links together.
6. the high efficiency DC-DC converter of the one as described in claim 4 or 5, is characterized in that: the secondary coil positive terminal of described transformer be connected to two described between diode.
7. the high efficiency DC-DC converter of one as described in claim 1 or 2 or 3 or 4 or 5, is characterized in that: described switching tube is field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320890999.2U CN203674985U (en) | 2013-12-31 | 2013-12-31 | High-efficiency DC-DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320890999.2U CN203674985U (en) | 2013-12-31 | 2013-12-31 | High-efficiency DC-DC converter |
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| CN203674985U true CN203674985U (en) | 2014-06-25 |
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| CN201320890999.2U Expired - Fee Related CN203674985U (en) | 2013-12-31 | 2013-12-31 | High-efficiency DC-DC converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103731040A (en) * | 2013-12-31 | 2014-04-16 | 中科恒源科技股份有限公司 | High-efficiency DC-DC converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103731040A (en) * | 2013-12-31 | 2014-04-16 | 中科恒源科技股份有限公司 | High-efficiency DC-DC converter |
| CN103731040B (en) * | 2013-12-31 | 2016-09-21 | 中科恒源科技股份有限公司 | A kind of high efficiency DC-DC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20211231 |
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| CF01 | Termination of patent right due to non-payment of annual fee |