CN207530700U - A kind of buck circuit drives circuit - Google Patents
A kind of buck circuit drives circuit Download PDFInfo
- Publication number
- CN207530700U CN207530700U CN201721716464.8U CN201721716464U CN207530700U CN 207530700 U CN207530700 U CN 207530700U CN 201721716464 U CN201721716464 U CN 201721716464U CN 207530700 U CN207530700 U CN 207530700U
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- high side
- nmos tube
- driving stage
- side driving
- buck
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Abstract
The utility model provides a kind of buck circuit drives circuit, including high side driving stage NMOS tube M1 and low side drive grade NMOS tube M2, it is characterised in that：In the grid connection ground capacity C1 of high side driving stage NMOS tube M1.Compared with prior art, it can effectively contain rising ring, on the basis of keeping the identical SW rates of climb, reduce ring, substantially reduce the height of due to voltage spikes, switching loss smaller, system frequency higher so that the switching tube of high side driving stage and low side drive grade is operated in its safety operation area.
Description
Technical field
The utility model is related to a kind of buck circuit drives circuits of electronic technology field.
Background technology
SW can be usually encountered in buck circuits can ring（Ring）Obtain situation terribly.The amplitude of the ring of SW can be right
LS power tubes impact, if ring is obtained terribly, too high voltage can even damage LS power tubes.
The amplitude of SW ring is very big with the ability correlation of driving stage, and stronger driving force can lead to faster SW
The speed of rise and fall also results in the ringing of bigger.Traditional driving stage cannot be made too fast, be exactly mistake in order to prevent
The excessive SW spike that fast driving is brought（Due to voltage spikes）, power stage is damaged.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of in the identical SW rise time, electricity can be made
The height at pointing peak substantially reduces, switching loss smaller, the higher buck circuit drives circuit of system frequency.
The technical solution adopted in the utility model is as follows：
A kind of buck circuit drives circuit, it is special including high side driving stage NMOS tube M1 and low side drive grade NMOS tube M2
Sign is：In the grid connection ground capacity C1 of high side driving stage NMOS tube M1.
The Cgd capacitances of the ground capacity C1 and high side driving stage NMOS tube M1 are same magnitude.
The capacitance of the ground capacity C1 is 1/5 to 2 times of the Cgd capacitances of high side driving stage NMOS tube M1.
Further include the resistance R1 to connect with ground capacity C1.
Compared with prior art, the beneficial effects of the utility model are：It can effectively contain rising ring, keep identical
The SW rates of climb on the basis of, reduce ring, substantially reduce the height of due to voltage spikes, switching loss smaller, system frequency
Higher so that the switching tube of high side driving stage and low side drive grade is operated in its safety operation area.EMI is also hopeful to be made more
It is low.
Description of the drawings
Fig. 1 is the principle schematic of the utility model wherein embodiment.
Fig. 2 is prior art buck circuit drives circuit theory schematic diagrams.
Fig. 3 is the parasitic inductance schematic diagram on the 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 parasitic inductance influence.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
This specification（Including any abstract and attached drawing）Disclosed in any feature, unless specifically stated, can be by other
Equivalent or with similar purpose alternative features are replaced.That is, unless specifically stated, each feature is a series of equivalent
An or example in similar characteristics.
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 grade
NMOS tube M2, in the grid connection ground capacity C1 of high side driving stage NMOS tube M1.
It is known that there are two switching tubes in buck structures, replace and open or alternately close the voltage so that between two switches
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, this is 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 better 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 the raising and lowering of SW, the driving stage with high side has very big relationship.It can be proved that the rate of rise of SW is determined
Due to the pull-up ability of high side driving and the Cgd of side switch pipe.The descending slope of SW is decided by the pull-down capability of high side driving
With the Cgd of side switch pipe.
So in order to enable SW has quick raising and lowering slope, the pull-up and pull-down capability needs of high side driving are set
Count stronger.However when driving force is after to a certain degree, the parasitic inductance above Vin and GND（As shown in Figure 3）
It can act so that the raising and lowering at SW ends is not ideal square-wave waveform.But ringing is had, generate overshoot.Such as
Fig. 4 show normal waveform, and Fig. 5 is overshoot waveform when having parasitic 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.The utility model proposes reduction
The mode of ringing, the capacitance of one grid from high side power pipe of increase to ground can effectively contain rising ringing,
On the basis of can keeping the identical SW rates of climb, reduce ringing so that the switching tube in figure is operated in its trouble free service
Area.
Specific embodiment 2
On the basis of specific embodiment 1, the Cgd capacitances of the ground capacity C1 and high side driving stage NMOS tube M1 are same
One magnitude.
Specific embodiment 3
On the basis of specific embodiment 1 or 2, the capacitance of the ground capacity C1 is high side driving stage NMOS tube M1's
1/5 to 2 times of Cgd capacitances.
Specific embodiment 4
On the basis of one of specific embodiment 1 to 3, the resistance R1 to connect with ground capacity C1 is further included.
In addition, the driving force for increasing high side driving should be reduced while ground capacity C1 is added, so that SW reaches 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 grade NMOS tube M2, feature
It is：In the grid connection ground capacity C1 of high side driving stage NMOS tube M1.
2. buck circuit drives circuit according to claim 1, it is characterised in that：The ground capacity C1 drives with high side
The Cgd capacitances of grade NMOS tube M1 are same magnitude.
3. buck circuit drives circuit according to claim 1 or 2, it is characterised in that：The capacitance of the ground capacity C1
1/5 to 2 times of Cgd capacitances for high side driving stage NMOS tube M1.
4. buck circuit drives circuit according to claim 1, it is characterised in that：Further include what is connected with ground capacity C1
Resistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721716464.8U CN207530700U (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 |
|---|---|---|---|
| CN201721716464.8U CN207530700U (en) | 2017-12-12 | 2017-12-12 | A kind of buck circuit drives circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207530700U true CN207530700U (en) | 2018-06-22 |
Family
ID=62579092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721716464.8U Active CN207530700U (en) | 2017-12-12 | 2017-12-12 | A kind of buck circuit drives circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207530700U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888064A (en) * | 2017-12-12 | 2018-04-06 | 清华四川能源互联网研究院 | A kind of buck circuit drives circuit |
-
2017
- 2017-12-12 CN CN201721716464.8U patent/CN207530700U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888064A (en) * | 2017-12-12 | 2018-04-06 | 清华四川能源互联网研究院 | A kind of buck circuit drives circuit |
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