CN107888064A - A kind of buck circuit drives circuit - Google Patents
A kind of buck circuit drives circuit Download PDFInfo
- Publication number
- CN107888064A CN107888064A CN201711313357.5A CN201711313357A CN107888064A CN 107888064 A CN107888064 A CN 107888064A CN 201711313357 A CN201711313357 A CN 201711313357A CN 107888064 A CN107888064 A CN 107888064A
- Authority
- CN
- China
- Prior art keywords
- high side
- nmos tube
- driving stage
- side driving
- buck
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The invention provides a kind of buck circuit drives circuit, including high side driving stage NMOS tube M1 and low side drive level NMOS tube M2, it is characterised in that：In high side driving stage NMOS tube M1 grid connection ground capacity C1.Compared with prior art, rising ring can effectively be contained, on the basis of keeping the identical SW rates of climb, reduce ring, substantially reduce the height of due to voltage spikes, switching loss is smaller, system frequency is higher so that the switching tube of high side driving stage and low side drive level is operated in its safety operation area.
Description
Technical field
The present invention relates to a kind of buck circuit drives circuit of electronic technology field.
Background technology
SW can be usually run into buck circuits can ring（Ring）Obtain situation terribly.SW ring amplitude can be right
LS power tubes impact, if ring is obtained terribly, too high voltage even can damage LS power tubes.
SW ring amplitude is very big with the ability correlation of driving stage, and stronger driving force can cause faster SW
The speed of rise and fall, also result in bigger ringing.Traditional driving stage can not be made too fast, exactly in order to prevent
The excessive SW spike that fast drive belt is come（Due to voltage spikes）, power stage is caused damage.
The content of the invention
The technical problem to be solved in the present invention is to provide one kind in the case of the identical SW rise time, voltage can be made sharp
The height at peak substantially reduces, and switching loss is smaller, the higher buck circuit drives circuits of system frequency.
The technical solution adopted by the present invention is as follows：
A kind of buck circuit drives circuit, including high side driving stage NMOS tube M1 and low side drive level NMOS tube M2, its feature exist
In：In high side driving stage NMOS tube M1 grid connection ground capacity C1.
The ground capacity C1 and high side driving stage NMOS tube M1 Cgd electric capacity is same magnitude.
The electric capacity of the ground capacity C1 is 1/5 to 2 times of high side driving stage NMOS tube M1 Cgd electric capacity.
Also include the resistance R1 to be connected with ground capacity C1.
Compared with prior art, the beneficial effects of the invention are as follows：Rising ring can effectively be contained, keep identical SW
On the basis of the rate of climb, reducing ring, substantially reduce the height of due to voltage spikes, switching loss is smaller, and system frequency is higher,
So that the switching tube of high side driving stage and low side drive level is operated in its safety operation area.EMI is also hopeful to be made lower.
Brief description of the drawings
Fig. 1 is the principle schematic of a wherein embodiment of the invention.
Fig. 2 is prior art buck circuit drives circuit theory schematic diagrams.
Fig. 3 is the stray inductance schematic diagram on prior art buck circuit drives circuits Vin and GND.
Fig. 4 is buck circuit drives circuit normal waveforms.
Fig. 5 is overshoot oscillogram when buck circuit drives circuits have stray inductance influence.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
This specification（Including summary and accompanying drawing）Disclosed in any feature, unless specifically stated otherwise, can be equivalent by other
Or the alternative features with similar purpose are replaced.I.e., unless specifically stated otherwise, each feature is a series of equivalent or class
Like an example in feature.
Specific embodiment 1
As shown in figure 1, a kind of buck circuit drives circuit, including high side（HS）Driving stage NMOS tube M1 and low side drive level NMOS
Pipe M2, in high side driving stage NMOS tube M1 grid connection ground capacity C1.
It is known that there is two switching tubes in buck structures, the voltage caused between two switches is opened or alternately closed to alternating
Node SW forms a square wave.In the buck of low pressure, the switch of high side and the switch of downside can directly drive, because
We can form the switch of high side using PMOS, and the switch of downside is formed using NMOS.
Medium and high pressure buck is then not quite similar.Because it can substantially be made in NMOS by more preferable resistor area
Just become first choice as high-side switch and low side switch simultaneously by the use of NMOS, our drive scheme is such in this case
（As shown in Figure 2）：Wherein the power supply of the driving stage of high side comes from BST-SW, and the driving of downside comes from VCC-GND.In this feelings
Under condition, the form of SW raising and lowering, the driving stage with high side has very big relation.It can prove, the SW rate of rise is determined
Due to the pull-up ability and the Cgd of side switch pipe of high side driving.SW descending slope is decided by the pull-down capability of high side driving
With the Cgd of side switch pipe.
So in order that obtaining SW has quick raising and lowering slope, the pull-up and pull-down capability of high side driving need to be set
Counting must be stronger.But when driving force is after to a certain degree, the stray inductance above Vin and GND（As shown in Figure 3）
It can act so that the raising and lowering at SW ends is not preferable square-wave waveform.But ringing is had, produce overshoot.Such as
Fig. 4 show normal waveform, and Fig. 5 is overshoot waveform when having stray inductance influence.It can prove：Overshoot is big with ring
The small slope positive correlation risen with SW.SW rises faster, and ringing will be bigger.Reduction ringing's proposed by the present invention
Mode, the electric capacity of one grid from high side power pipe of increase to ground, it can effectively contain and rise ringing, can keep
On the basis of the identical SW rates of climb, reduce ringing so that the switching tube in figure is operated in its safety operation area.
Specific embodiment 2
On the basis of specific embodiment 1, the ground capacity C1 and high side driving stage NMOS tube M1 Cgd electric capacity is same amount
Level.
Specific embodiment 3
On the basis of specific embodiment 1 or 2, the Cgd that the electric capacity of the ground capacity C1 is high side driving stage NMOS tube M1 is electric
1/5 to 2 times held.
Specific embodiment 4
On the basis of one of specific embodiment 1 to 3, in addition to the resistance R1 to be connected with ground capacity C1.
In addition, the driving force of increase high side driving should be reduced while ground capacity C1 is added, to cause SW to reach phase
The same rate of climb.
Claims (4)
1. a kind of buck circuit drives circuit, including high side driving stage NMOS tube M1 and low side drive level NMOS tube M2, its feature
It is：In high side driving stage NMOS tube M1 grid connection ground capacity C1.
2. buck circuit drives circuit according to claim 1, it is characterised in that：The ground capacity C1 drives with high side
Level NMOS tube M1 Cgd electric capacity is same magnitude.
3. buck circuit drives circuit according to claim 1 or 2, it is characterised in that：The electric capacity of the ground capacity C1
For 1/5 to 2 times of high side driving stage NMOS tube M1 Cgd electric capacity.
4. buck circuit drives circuit according to claim 1, it is characterised in that：Also include what is connected with ground capacity C1
Resistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313357.5A CN107888064A (en) | 2017-12-12 | 2017-12-12 | A kind of buck circuit drives circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313357.5A CN107888064A (en) | 2017-12-12 | 2017-12-12 | A kind of buck circuit drives circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107888064A true CN107888064A (en) | 2018-04-06 |
Family
ID=61773632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711313357.5A Pending CN107888064A (en) | 2017-12-12 | 2017-12-12 | A kind of buck circuit drives circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107888064A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115694140A (en) * | 2022-12-28 | 2023-02-03 | 西安水木芯邦半导体设计有限公司 | Driving circuit applied to step-down DC-DC converter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001015691A (en) * | 1999-06-30 | 2001-01-19 | Toshiba Microelectronics Corp | Semiconductor integrated circuit |
| JP2007209167A (en) * | 2006-02-03 | 2007-08-16 | Toyota Motor Corp | Inverter drive circuit |
| CN102769453A (en) * | 2012-06-30 | 2012-11-07 | 东南大学 | High-voltage side gate drive circuit capable of resisting noise interference |
| CN102946185A (en) * | 2012-11-26 | 2013-02-27 | 电子科技大学 | Control circuit for improving switching power supply output voltage transient response |
| CN204258612U (en) * | 2014-12-11 | 2015-04-08 | 杭州宽福科技有限公司 | Reduce switch overshoot voltage device |
| CN106230416A (en) * | 2016-07-14 | 2016-12-14 | 电子科技大学 | A kind of nothing bootstrapping gate driver circuit of band active clamp |
| CN207530700U (en) * | 2017-12-12 | 2018-06-22 | 清华四川能源互联网研究院 | A kind of buck circuit drives circuit |
-
2017
- 2017-12-12 CN CN201711313357.5A patent/CN107888064A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001015691A (en) * | 1999-06-30 | 2001-01-19 | Toshiba Microelectronics Corp | Semiconductor integrated circuit |
| JP2007209167A (en) * | 2006-02-03 | 2007-08-16 | Toyota Motor Corp | Inverter drive circuit |
| CN102769453A (en) * | 2012-06-30 | 2012-11-07 | 东南大学 | High-voltage side gate drive circuit capable of resisting noise interference |
| CN102946185A (en) * | 2012-11-26 | 2013-02-27 | 电子科技大学 | Control circuit for improving switching power supply output voltage transient response |
| CN204258612U (en) * | 2014-12-11 | 2015-04-08 | 杭州宽福科技有限公司 | Reduce switch overshoot voltage device |
| CN106230416A (en) * | 2016-07-14 | 2016-12-14 | 电子科技大学 | A kind of nothing bootstrapping gate driver circuit of band active clamp |
| CN207530700U (en) * | 2017-12-12 | 2018-06-22 | 清华四川能源互联网研究院 | A kind of buck circuit drives circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115694140A (en) * | 2022-12-28 | 2023-02-03 | 西安水木芯邦半导体设计有限公司 | Driving circuit applied to step-down DC-DC converter |
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