CN202616991U - Soft switching synchronous rectification BUCK converter for small power - Google Patents
Soft switching synchronous rectification BUCK converter for small power Download PDFInfo
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- CN202616991U CN202616991U CN 201220215708 CN201220215708U CN202616991U CN 202616991 U CN202616991 U CN 202616991U CN 201220215708 CN201220215708 CN 201220215708 CN 201220215708 U CN201220215708 U CN 201220215708U CN 202616991 U CN202616991 U CN 202616991U
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Abstract
The utility model discloses a soft switching synchronous rectification BUCK converter for small power, which is composed of a power source, a main switching tube, an auxiliary switching tube, three capacitors, two diodes and an inductor, wherein the anode of the power source is connected with the main switching tube serially, the main switching tube is connected with the auxiliary switching tube serially, the auxiliary switching tube is connected with the cathode of the power source, the main switching tube is further connected with the inductor serially, the inductor is connected with the third capacitor serially, the capacitors are connected with the cathode of the power source, the main switching tube is connected with the first capacitor and the first diode in parallel, the auxiliary switching tube is connected with the second capacitor and the second diode in parallel, and the two ends of the third capacitor are connected with the two ends of load in parallel. According to the utility model, the synchronous rectification converter is applied in case of small power, and the situation that inductive current reversal caused by capacitance energy reflux is impossible in a traditional synchronous rectification converter is completely changed, zero voltage switch-on and switch-off of the main and auxiliary switch tubes of the converter is implemented, and the efficiency of the converter is improved significantly.
Description
Technical field
The utility model relates to field of power conversion, is specifically related to a kind of low power soft switch synchronous rectification BUCK converter that is used for.
Background technology
Existing BUCK converter is divided into common BUCK converter and synchronous rectification BUCK converter.Common BUCK converter is when main switch turn-offs, and inductance is through diode continuousing flow, and the forward voltage drop of general diode is a fixed value.Therefore converter is when big electric current is exported, and the loss on this diode is very big.The traditional synchronous rectification BUCK converter main switch and the driving complementation of auxiliary switch are got, and between the driving fixing Dead Time can be set, and be straight-through to prevent two switching tubes.Voltage and current has overlapping during switching tube work, can produce bigger switching loss, influences transducer effciency.And, generally all can directly ignore its switching loss for very low power BUCK converter.In fact, because the rated power of converter itself is just very little, the existence of switching loss can occupy the larger specific gravity of converter rated power, makes the efficient of small-power BUCK converter be difficult to the level that reaches higher.
The utility model content
The purpose of the utility model is to overcome the above problem that prior art exists; A kind of low power soft switch synchronous rectification BUCK converter that is used for is provided; This utility model makes main switch and the auxiliary switch of small-power synchronous rectification BUCK converter can both realize that no-voltage opens and judge, promotes transducer effciency.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the utility model is realized through following technical scheme:
The utility model discloses a kind of low power soft switch synchronous rectification BUCK converter that is used for; Form by power supply, main switch, auxiliary switch, three electric capacity, two diodes and an inductance; The positive pole of said power supply is connected with main switch, and said main switch is connected with auxiliary switch, and said auxiliary switch is connected with power cathode; Said main switch is also connected with said inductance; Said inductance and the 3rd capacitances in series, said the 3rd electric capacity is connected with the negative pole of power supply, and said the 3rd electric capacity two ends are connected with the load two ends.
Further, also be parallel with first electric capacity and first diode on the said main switch.
Further, also be parallel with second electric capacity and second diode on the said auxiliary switch.
The advantage of the utility model is:
The ingenious component parameter that designed of the utility model is applied to the small-power occasion with synchronous rectifier converter, and the synchronous rectifier converter that the breaks traditions reverse situation of inductive current that do not allow capacitive energy to reflux to cause.Realized that the no-voltage of converter main switch and auxiliary switch opens shutoff, significantly promoted transducer effciency.
Above-mentioned explanation only is the general introduction of the utility model technical scheme, in order more to know the technological means of understanding the utility model, and can implement according to the content of specification, below with the preferred embodiment of the utility model and conjunction with figs. specify as after.The embodiment of the utility model is provided by following examples and accompanying drawing thereof in detail.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the electrical block diagram of the utility model;
Energy Flow sketch map when Fig. 2 opens for the main switch S1 of the utility model;
When Fig. 3 opens for the auxiliary switch S2 of the utility model, the energy Flow sketch map when inductive current is reverse;
When Fig. 4 opens for the auxiliary switch S2 of the utility model, the energy Flow sketch map after inductive current is reverse;
Fig. 5 is main switch S1 of the utility model and the drive waveforms sketch map of auxiliary switch S2.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the utility model.
With reference to shown in Figure 1; The utility model discloses a kind of low power soft switch synchronous rectification BUCK converter that is used for, be made up of power supply VCC, main switch S1, auxiliary switch S2, three capacitor C, C1, C2, two diode VD1, VD2 and inductance L, the positive pole of said power supply VCC is connected with main switch S1; Said main switch S1 connects with auxiliary switch S2; Said auxiliary switch S2 is connected with power supply VCC negative pole, and said main switch S1 also connects with said inductance L, and said inductance L is connected with the 3rd capacitor C; Said the 3rd capacitor C is connected with the negative pole of said power supply VCC, and said the 3rd capacitor C two ends are connected with load LOAD two ends.
Further, also be parallel with first capacitor C 1 and the first diode VD1 on the said main switch S1.
Further, also be parallel with second capacitor C 2 and the second diode VD2 on the said auxiliary switch S2.
The operation principle of present embodiment is following:
The main points that the utility model is realized be through the appropriate designs energy storage inductor less than some higher limits, make energy storage inductor work in the discontinuous current pattern, and when the inductive current zero passage, still open auxiliary switch.Can force the energy on the storage capacitor to make the reverse and stored energy of inductive current like this, this part energy will be used for resonance makes main switch realize that no-voltage is open-minded.Below specify the utility model circuit and the course of work.
Suppose initial time T0, main switch S1 is in opening state, and through S1, L powering load and to the storage capacitor charging, the last electric current of L from left to right from the input side power supply for energy.
T1 turn-offs S1 constantly, because the cushioning effect of S1 two ends shunt capacitance, S1 is that no-voltage is turn-offed; The inductance L electric current can not suddenly change, the load of flowing through, and the parasitic diode afterflow through S2, and the S2 voltage is clamped to zero; Through a bit of Dead Time, open S2, S2 is that no-voltage is open-minded, the inductance L electric current passes through S2 and parasitic diode afterflow thereof, and constantly reduces.
In the T2 moment, electric current is reduced to zero on the inductance L, and the parasitic diode of S2 turn-offs naturally, but S2 still is in opening state; Energy on the electric capacity will pass through L at this moment, S2 forms the loop, and inductive current begins to increase from right to left.
T3 turn-offs S2 constantly, and the inductance L electric current can not suddenly change, and begins resonance with C1, C2, to the C1 discharge, charges to C2.Because the cushioning effect of C2, S2 is that no-voltage is turn-offed; Simultaneously, inductance and C1 resonance are gone up charge discharging resisting with C1.When C1 goes up charge discharging resisting to zero the time, the parasitic diode of S1 with S1 voltage clamper to zero.
T4 constantly opens S1 and since before the S1 voltage be clamped to zero, so that S1 is a no-voltage is open-minded.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (3)
1. one kind is used for low power soft switch synchronous rectification BUCK converter; It is characterized in that: form by power supply (VCC), main switch (S1), auxiliary switch (S2), three electric capacity (C, C1, C2), two diodes (VD1, VD2) and an inductance (L); The positive pole of said power supply (VCC) is connected with main switch (S1); Said main switch (S1) is connected with auxiliary switch (S2); Said auxiliary switch (S2) is connected with power supply (VCC) negative pole, and said main switch (S1) is also connected with said inductance (L), and said inductance (L) is connected with the 3rd electric capacity (C); Said the 3rd electric capacity (C) is connected with the negative pole of said power supply (VCC), and said the 3rd electric capacity (C) two ends are connected with load (LOAD) two ends.
2. a kind of low power soft switch synchronous rectification BUCK converter that is used for according to claim 1 is characterized in that: also be parallel with first electric capacity (C1) and first diode (VD1) on the said main switch (S1).
3. a kind of low power soft switch synchronous rectification BUCK converter that is used for according to claim 1 is characterized in that: also be parallel with second electric capacity (C2) and second diode (VD2) on the said auxiliary switch (S2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215708 CN202616991U (en) | 2012-05-15 | 2012-05-15 | Soft switching synchronous rectification BUCK converter for small power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215708 CN202616991U (en) | 2012-05-15 | 2012-05-15 | Soft switching synchronous rectification BUCK converter for small power |
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| Publication Number | Publication Date |
|---|---|
| CN202616991U true CN202616991U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220215708 Expired - Lifetime CN202616991U (en) | 2012-05-15 | 2012-05-15 | Soft switching synchronous rectification BUCK converter for small power |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710115A (en) * | 2012-05-15 | 2012-10-03 | 江苏固德威电源科技有限公司 | Synchronous rectification BUCK converter for soft switch with small power |
| CN107395015A (en) * | 2017-08-08 | 2017-11-24 | 哈尔滨工业大学 | A kind of low ripple Sofe Switch synchronous rectification Buck converters based on coupling inductance |
| CN110061624A (en) * | 2019-04-08 | 2019-07-26 | 上海英联电子系统有限公司 | Using the Sofe Switch resonance BUCK converter of pulse width modulation controlled |
-
2012
- 2012-05-15 CN CN 201220215708 patent/CN202616991U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710115A (en) * | 2012-05-15 | 2012-10-03 | 江苏固德威电源科技有限公司 | Synchronous rectification BUCK converter for soft switch with small power |
| CN107395015A (en) * | 2017-08-08 | 2017-11-24 | 哈尔滨工业大学 | A kind of low ripple Sofe Switch synchronous rectification Buck converters based on coupling inductance |
| CN110061624A (en) * | 2019-04-08 | 2019-07-26 | 上海英联电子系统有限公司 | Using the Sofe Switch resonance BUCK converter of pulse width modulation controlled |
| CN110061624B (en) * | 2019-04-08 | 2022-07-01 | 上海英联电子系统有限公司 | Soft switch resonance BUCK converter controlled by pulse width modulation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215000 No. 189, Kunlun mountain road, hi tech Industrial Development Zone, Jiangsu, Suzhou Patentee after: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO., LTD. Address before: 215000 No. 189, Kunlun mountain road, hi tech Industrial Development Zone, Jiangsu, Suzhou Patentee before: Jiangsu Goodwe Power Supply Technology Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Patentee after: Goodway Technology Co.,Ltd. Address before: 215000 No. 189, Kunlunshan Road, high tech Industrial Development Zone, Suzhou, Jiangsu Patentee before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121219 |