CN206575329U - A kind of BUCK converter circuits - Google Patents
A kind of BUCK converter circuits Download PDFInfo
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- CN206575329U CN206575329U CN201720198567.3U CN201720198567U CN206575329U CN 206575329 U CN206575329 U CN 206575329U CN 201720198567 U CN201720198567 U CN 201720198567U CN 206575329 U CN206575329 U CN 206575329U
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- capacitance
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- power supply
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Abstract
A kind of BUCK converter circuits, including power supply V1, input capacitance C4, output capacitance C3, load RL, switching tube Q1, sustained diode 3, output inductor L2, resonant inductance L1, resonant capacitance C1, resonant capacitance C2, booster diode D1 and booster diode D2, the input capacitance C4 and power supply V1 is in parallel, the positive pole of the power supply V1 is connected with switching tube Q1 drain electrodes, the source electrode of the switching tube Q1 is connected by output inductor L2 with loading RL one end, the other end of the load RL and power supply V1 negative pole are grounded, the output capacitance C3 is parallel to load RL two ends；The sustained diode 3, resonant inductance L1, resonant capacitance C1, resonant capacitance C2, booster diode D1 and booster diode D2 composition buffer circuits, the utility model is on the basis of original BUCK topologys are kept by adding buffer circuit, not only reduce the switch energy consumption of switching tube, improve the efficiency of BUCK converters, power density, and reduce electromagnetic interference.
Description
Technical field
The utility model is related to the technical field of controller for solar in photovoltaic generating system to battery charger, specifically
It is related to a kind of BUCK converter circuits.
Background technology
At present, in the device that photovoltaic generating system controller for solar charges to battery, BUCK converter circuit conducts
A kind of most basic DC-DC topologys are widely used in various power supply products, with the progress of power technology, high efficiency and height
The converter of power density is into a kind of trend, the particularly occasion in small volume, and power density requirements are just higher, that is, requires to become
The conversion efficiency of parallel operation is higher, and the conversion efficiency for improving converter is the study hotspot of field of power electronics in recent years, is also
The inexorable trend of power technology.
Fig. 1 is the circuit structure of traditional BUCK converter circuits, as shown in figure 1, it is by input power V1, input electricity
Hold C1, input switch pipe Q1, continued flow tube D1, inductance L1, output capacitance C2, load R1 compositions.In circuit, input switch pipe
Q1 is MOSFET, due to the presence of junction capacity inside MOSFET, and when Q1 is turned on, its VDS voltages are input voltage, after conducting
Junction capacity is short-circuited, and energy expenditure causes energy expenditure in Q1.And this energy expenditure can be with the increase of switching frequency
And increase.Presence for this reason, the switching frequency of power supply is limited, and conversion efficiency is low.Because switching frequency is direct
The size of inductance and electric capacity is influenceed, relatively low switching frequency increases the design load of inductance capacitance, so as to need the electricity of large volume
Sense and electric capacity.Further, since Q1 conducting moments di/dt are very high, this is very serious by the electromagnetic interference for causing power supply.Therefore,
Traditional BUCK converters have the shortcomings that conversion efficiency is low, power density is small, volume is big and electromagnetic interference is serious.
Utility model content
The utility model in order to solve prior art presence above mentioned problem there is provided one kind by add buffer circuit come
The BUCK converter circuits of raising efficiency.
Above-mentioned purpose is realized, the utility model provides a kind of BUCK converter circuits, including power supply V1, input capacitance
C4, output capacitance C3, load RL, switching tube Q1, sustained diode 3, output inductor L2, resonant inductance L1, resonant capacitance
C1, resonant capacitance C2, booster diode D1 and booster diode D2, the input capacitance C4 and power supply V1 are in parallel, the electricity
Source V1 positive pole is connected with switching tube Q1 drain electrodes, and the source electrode of the switching tube Q1 passes through output inductor L2 and the one of load RL
End is connected, and the other end of the load RL and power supply V1 negative pole are grounded, and the output capacitance C3 is parallel to the two of load RL
End；The sustained diode 3, resonant inductance L1, resonant capacitance C1, resonant capacitance C2, booster diode D1 and booster diode
D2 constitutes buffer circuit, the source electrode of switching tube Q1 negative electrode also respectively with booster diode D1, resonant inductance L1 one end phase
Even, the booster diode D1 and booster diode D2 be in series, the resonant inductance L1 other ends and sustained diode 3
Negative electrode is connected, and booster diode D2 anode and the anode of sustained diode 3 be grounded, described resonant capacitance C1 one end with
Switching tube Q1 drain electrode is connected, and the resonant capacitance C1 other end is connected with booster diode D1 anode, the resonant capacitance C2
One end is connected with booster diode D1 anode, and the resonant capacitance C2 other end is connected with the negative electrode of sustained diode 3.
As further preferred scheme of the present utility model, the switching tube Q1 is metal-oxide-semiconductor.
BUCK converter circuits of the present utility model can reach following beneficial effect：
1 ）Solve the problems, such as the switching loss of switching tube in traditional BUCK voltage dropping power supplies；
2 ）Solve the stress problem that the electric current of switching tube in traditional BUCK voltage dropping power supplies, voltage open moment；
3）Solve the problem of electromagnetic interference is serious in traditional BUCK voltage dropping power supplies；
4）Solve traditional BUCK voltage dropping power supplies causes inductance in circuit, electric capacity are bulky to ask because switching frequency is low
Topic；
5 ）Big problem can not be lifted because of available circuit structure by solving traditional BUCK voltage dropping power supplies conversion efficiency.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the circuit structure of traditional BUCK converter circuits；
The structural representation for the example that Fig. 2 provides for the utility model BUCK converter circuits.
The utility model purpose is realized, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further.In preferred embodiment
Cited such as " on ", " under ", "left", "right", only " centre " and " one " term, understanding for ease of narration, and be not used to
The enforceable scope of the utility model is limited, being altered or modified for its relativeness is changed under technology contents without essence, when also
It is considered as the enforceable category of the utility model.
The structural representation for the example that Fig. 2 provides for the utility model BUCK converter circuits, as shown in Fig. 2 BUCK
Converter circuit includes power supply V1, input capacitance C4, output capacitance C3, load RL, switching tube Q1, sustained diode 3, output
Filter inductance L2, resonant inductance L1, resonant capacitance C1, resonant capacitance C2, booster diode D1 and booster diode D2, it is described defeated
Enter electric capacity C4 and power supply V1 to be in parallel, the positive pole of the power supply V1 is connected with switching tube Q1 drain electrodes, the source electrode of the switching tube Q1
It is connected by output inductor L2 with loading RL one end, the other end of the load RL and power supply V1 negative pole are grounded,
The output capacitance C3 is parallel to load RL two ends；The sustained diode 3, resonant inductance L1, resonant capacitance C1, resonance
Electric capacity C2, booster diode D1 and booster diode D2 composition buffer circuits, the source electrode of the switching tube Q1 also respectively with auxiliary
Diode D1 negative electrode, resonant inductance L1 one end are connected, and the booster diode D1 and booster diode D2 are in series, described humorous
The inductance L1 other ends that shake are connected with the negative electrode of sustained diode 3, and booster diode D2 anode and the sun of sustained diode 3
Extremely it is grounded, described resonant capacitance C1 one end is connected with switching tube Q1 drain electrode, resonant capacitance the C1 other end and two poles of auxiliary
Pipe D1 anode is connected, and described resonant capacitance C2 one end is connected with booster diode D1 anode, the resonant capacitance C2 other end
It is connected with the negative electrode of sustained diode 3.
In order to allow those skilled in the art to more fully understand and realize the technical solution of the utility model, brief description sheet
The realization principle of embodiment.
Creation core of the present utility model is, is added on the topological structure of traditional BUCK converter circuits, by
Sustained diode 3, resonant inductance L1, resonant capacitance C1, resonant capacitance C2, booster diode D1 and booster diode D2 compositions
Buffer circuit.
Course of work during stable state is in for power supply below：Input as Vin, Vout is output as, with reference to as shown in Figure 2：
1, initial time：If switching tube Q1 is opened in no-voltage, Q1 conductings, because L2 presence greatly inhibits D3's
Reverse recovery, makes the slow linear rise of its electric current, so that switching tube Q1 electric current linear rise, obtains ZCS and open condition, reduce
Switching loss when opening；
2, after D3 Reverse recoveries terminate, resonant capacitance C1, resonant capacitance C2 and resonant inductance L1 are auxiliary by switching tube Q1
Help diode D2 to constitute resonant tank and start resonance, now resonant capacitance C1 discharges, resonant capacitance C2 chargings, when the electricity on C1
It is that voltage creates ZVS turn-off criterions when pressure UC1 drops to zero.
3, as UC1=0, booster diode D1 conductings, output inductor L2 and resonant capacitance C2 pass through by aiding in two poles
Resonance occurs for the loop that pipe D1, booster diode D2 are constituted, and resonant inductance L1 energy transfer works as resonance to resonant capacitance C2
During electric current iL1 on inductance L1=0, the resonant process terminates, and buffer circuit is stopped, and circuit is opened into normal pulsewidth modulation
Pass through journey.
4, switching tube Q1 are turned off, due to existing on resonant capacitance C1, switching tube Q1 drain-source voltage Uds=UC1, Uds
Rise slow, obtain ZVS shut-offs, reduce switching loss during shut-off.
5, when UC1 reaches certain value, booster diode D2 conductings, resonant capacitance C2 and resonant inductance L1 resonant discharges, make
Inductive current continues to increase, while resonant capacitance C1 continues to charge, and rises to Uin in this stage UC1, so that can guarantee that,
Switching tube Q1 realizes that ZCS is opened to reduce switching loss in next switch periods.
6, as UC1=Uin, booster diode D1 conductings, resonant capacitance C2 and resonant inductance L1 continue resonance, work as iL1
When increasing to I0, UC2 starts linear decline, as UC2=0, and booster diode D2 cut-offs, sustained diode 3 is turned on, and is buffered
Circuit is stopped, and circuit enters normal-width and modulates off-phases, until Q1 is next time open-minded.
The present embodiment improves the efficiency of BUCK converters by adding above-mentioned buffer circuit, is opened up keeping original BUCK
By adding buffer circuit on the basis of flutterring, switching tube Q1 switch energy consumption is not only reduced, BUCK converters are improved
Efficiency, power density, and electromagnetic interference etc. is reduced, it is achieved thereby that the miniaturization of power supply.
Although the foregoing describing embodiment of the present utility model, those skilled in the art should manage
Solution, these are merely illustrative of, and can make various changes or modifications to present embodiment, without departing from original of the present utility model
Reason and essence, protection domain of the present utility model are only limited by the claims that follow.
Claims (2)
1. a kind of BUCK converter circuits, it is characterised in that including power supply (V1), input capacitance (C4), output capacitance（C3）, it is negative
Carry（RL）, switching tube（Q1）, fly-wheel diode（D3）, output inductor（L2）, resonant inductance（L1）, resonant capacitance（C1）、
Resonant capacitance（C2）, booster diode（D1）And booster diode（D2）, the input capacitance（C4）With power supply（V1）It is in parallel,
The power supply（V1）Positive pole and switching tube（Q1）Drain electrode is connected, the switching tube（Q1）Source electrode pass through output inductor
（L2）With load（RL）One end be connected, the load（RL）The other end and power supply（V1）Negative pole be grounded, the output
Electric capacity（C3）It is parallel to load（RL）Two ends；The fly-wheel diode（D3）, resonant inductance（L1）, resonant capacitance（C1）, it is humorous
Shake electric capacity（C2）, booster diode（D1）And booster diode（D2）Constitute buffer circuit, the switching tube（Q1）Source electrode also
Respectively with booster diode（D1）Negative electrode, resonant inductance（L1）One end is connected, the booster diode（D1）With aid in two poles
Pipe（D2）It is in series, the resonant inductance（L1）The other end and fly-wheel diode（D3）Negative electrode be connected, and booster diode
（D2）Anode and fly-wheel diode（D3）Anode be grounded, the resonant capacitance（C1）One end and switching tube（Q1）Drain electrode
It is connected, resonant capacitance（C1）The other end and booster diode（D1）Anode be connected, the resonant capacitance（C2）One end with it is auxiliary
Help diode（D1）Anode be connected, resonant capacitance（C2）The other end and fly-wheel diode（D3）Negative electrode be connected.
2. BUCK converter circuits according to claim 1, it is characterised in that the switching tube（Q1）For metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720198567.3U CN206575329U (en) | 2017-03-02 | 2017-03-02 | A kind of BUCK converter circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720198567.3U CN206575329U (en) | 2017-03-02 | 2017-03-02 | A kind of BUCK converter circuits |
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| Publication Number | Publication Date |
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| CN206575329U true CN206575329U (en) | 2017-10-20 |
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| CN201720198567.3U Expired - Fee Related CN206575329U (en) | 2017-03-02 | 2017-03-02 | A kind of BUCK converter circuits |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149939A (en) * | 2018-09-21 | 2019-01-04 | 中车青岛四方车辆研究所有限公司 | For low-floor tramcar AuCT light-weight design method |
| CN109546859A (en) * | 2018-12-20 | 2019-03-29 | 北京大豪科技股份有限公司 | Voltage conversion circuit |
| CN110299842A (en) * | 2019-07-23 | 2019-10-01 | 东莞保力电子有限公司 | A kind of pressurization afterflow low voltage difference Buck type switching power unit |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
-
2017
- 2017-03-02 CN CN201720198567.3U patent/CN206575329U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149939A (en) * | 2018-09-21 | 2019-01-04 | 中车青岛四方车辆研究所有限公司 | For low-floor tramcar AuCT light-weight design method |
| CN109149939B (en) * | 2018-09-21 | 2020-06-05 | 中车青岛四方车辆研究所有限公司 | Lightweight design method for auxiliary converter of low-floor tramcar |
| CN109546859A (en) * | 2018-12-20 | 2019-03-29 | 北京大豪科技股份有限公司 | Voltage conversion circuit |
| CN110299842A (en) * | 2019-07-23 | 2019-10-01 | 东莞保力电子有限公司 | A kind of pressurization afterflow low voltage difference Buck type switching power unit |
| CN110299842B (en) * | 2019-07-23 | 2024-02-13 | 东莞保力电子有限公司 | Boost freewheel low pressure differential Buck type switching power supply device |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171020 Termination date: 20190302 |
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| CF01 | Termination of patent right due to non-payment of annual fee |