CN201349180Y - Synchronous rectifier driving circuit - Google Patents
Synchronous rectifier driving circuit Download PDFInfo
- Publication number
- CN201349180Y CN201349180Y CNU2009201295809U CN200920129580U CN201349180Y CN 201349180 Y CN201349180 Y CN 201349180Y CN U2009201295809 U CNU2009201295809 U CN U2009201295809U CN 200920129580 U CN200920129580 U CN 200920129580U CN 201349180 Y CN201349180 Y CN 201349180Y
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- China
- Prior art keywords
- winding
- driving
- driving circuit
- circuit
- synchronous rectifier
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- Expired - Lifetime
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Abstract
The utility model discloses a synchronous rectifier driving circuit. The circuit comprises a driving winding which is independently increased on a secondary side of a main switching transformer, and the peak voltage sensed by the driving winding is lower than plus or minus 20V. The driving winding comprises a center tap, the center tap is connected with an output end power supply ground, and other two leading-out ends of the driving winding are respectively connected with gates of two switching rectifier diodes. The best scheme is that the leading-out ends at two ends of the driving winding are connected with the gates of the two switching rectifier diodes by resistors R1 and R2. The driving voltage of the gates of the synchronous rectifier driving circuit meets the requirement of being lower than plus or minus 20V and is not limited by the peak value of a primary winding of the main switching transformer, thereby realizing the flexible self-driving mode. Furthermore, the synchronous rectifier driving circuit has the advantages of simple circuit, easy debugging and low cost.
Description
Technical field
The utility model relates to a kind of Switching Power Supply synchronous rectification driving circuit.
Background technology
In the prior art, the synchronous rectification type of drive of Switching Power Supply DC/DC converter can be divided into self-powered mode and application-specific integrated circuit (ASIC) type of drive.
The synchronous rectification self-powered mode of known Switching Power Supply DC/DC converter is the grid that the voltage signal of main switch transformer secondary winding output loop is directly inserted MOS switching and rectifying pipe, and this scheme is owing to be subjected to MOS switching and rectifying pipe V
GSVoltage is usually smaller or equal to the restriction of ± 20V, under the situation of secondary peak voltage greater than ± 20V, can not reliably use, thereby limit the scope that makes of this mode.
And the application-specific integrated circuit (ASIC) type of drive needs the special synchronizing signal sample circuit of design, and design provides the circuit of corresponding synchronous drive signal, its circuit complexity, cost height.
Summary of the invention
The utility model be is at defective that exists in the prior art or deficiency, independently drive winding in the increase of main switch transformer secondary, the drive signal loop is separated with output loop, make things convenient for the independent design gate drive voltage, make gate drive voltage satisfy requirement less than ± 20V, no longer be limited by main switch transformer secondary output crest voltage, realize self-driven flexibly mode.Its circuit is simple, and debugging easily, and is with low cost.
The utility model is by realizing by the following technical solutions:
Design a kind of synchronous rectification driving circuit, described circuit comprises:
One drives winding, independently increases at the secondary of main switch transformer, and the crest voltage that described driving winding is responded to is less than ± 20V.
Described driving winding has a centre tap, and described centre tap connects output end power ground, and two exits of other of described driving winding connect the grid of two switching and rectifying pipes respectively.
Best, the exit at described driving winding two ends is the grids that connect two switching and rectifying pipes by resistance R 1, R2.
Compared with prior art, superiority of the present utility model is: gate drive voltage satisfies the requirement less than ± 20V, no longer is limited by main switch transformer secondary output crest voltage, realizes self-driven flexibly mode.
The utility model circuit is simple, and debugging easily, and is with low cost.
Description of drawings
Fig. 1 is the electrical schematic diagram of a kind of synchronous rectification driving circuit of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.
As shown in Figure 1, design a kind of synchronous rectification driving circuit, described circuit comprises:
One drives winding 5～6, independently increase at the secondary of main switch transformer T1, and the crest voltage that described driving winding 5～6 is responded to, the relative output end power of this voltage ground is less than ± 20V.
Described driving winding 5～6 has a centre tap, and described centre tap connects output end power ground, and two exits of other of described driving winding 5～6 connect the grid of two switching and rectifying pipe Q2, Q3 respectively.
Best, the exit at described driving winding 5～6 two ends is the grids that connect two switching and rectifying pipe Q2, Q3 by resistance R 1, R2.
Circuit theory of the present utility model:
Q1 is a main switch, and T1 main switch transformer, Q2, Q3 are the switching and rectifying pipe of synchronous rectification, the best MOS switching tube that adopts, and R1, R2 are the gate driving protective resistance, and the two ends that drive winding 5～6 connect R1, R2 respectively, and its centre cap connects output end power ground.
By adjusting 1～2 pair 3～4 the turn ratio, can satisfy the requirement of output voltage to main output winding; By adjusting 1～2 pair 5～6 the turn ratio, satisfy Q2, Q3 gate drive voltage to be lower than ± requirement of 20V.And adjust 1～2 pair 5～6 the turn ratio, and can independently carry out, be not subjected to the influence of 1～2 pair 3～4 turn ratio.
Type of drive is as follows: when 1 end of transformer T1 is timing, 4,5 ends are being for just, and 3,6 ends are for negative, the Q2 conducting, and Q3 ends; When 1 end of transformer T1 when negative, 4,5 ends are for negative, 3,6 ends are being for just, the Q3 conducting, Q2 ends.Realize synchronous rectification.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (3)
1. a synchronous rectification driving circuit is characterized in that, described circuit comprises:
One drives winding, independently increases at the secondary of main switch transformer, and the crest voltage that described driving winding is responded to is less than ± 20V.
2. a kind of synchronous rectification driving circuit according to claim 1 is characterized in that:
Described driving winding has a centre tap, and described centre tap connects output end power ground, and two exits of other of described driving winding connect the grid of two switching and rectifying pipes respectively.
3. a kind of synchronous rectification driving circuit according to claim 2 is characterized in that:
The exit at described driving winding two ends is the grids that connect two switching and rectifying pipes by resistance R 1, R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201295809U CN201349180Y (en) | 2009-01-20 | 2009-01-20 | Synchronous rectifier driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201295809U CN201349180Y (en) | 2009-01-20 | 2009-01-20 | Synchronous rectifier driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201349180Y true CN201349180Y (en) | 2009-11-18 |
Family
ID=41368643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201295809U Expired - Lifetime CN201349180Y (en) | 2009-01-20 | 2009-01-20 | Synchronous rectifier driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201349180Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223069A (en) * | 2011-06-25 | 2011-10-19 | 深圳航天科技创新研究院 | Self-driven synchronous buck converter circuit |
| WO2013155816A1 (en) * | 2012-04-20 | 2013-10-24 | 深圳市晶福源电子技术有限公司 | Synchronous power rectifying circuit |
-
2009
- 2009-01-20 CN CNU2009201295809U patent/CN201349180Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223069A (en) * | 2011-06-25 | 2011-10-19 | 深圳航天科技创新研究院 | Self-driven synchronous buck converter circuit |
| WO2013155816A1 (en) * | 2012-04-20 | 2013-10-24 | 深圳市晶福源电子技术有限公司 | Synchronous power rectifying circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091118 |
|
| CX01 | Expiry of patent term |