CN206585464U - A kind of buck circuit - Google Patents
A kind of buck circuit Download PDFInfo
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- CN206585464U CN206585464U CN201720066703.3U CN201720066703U CN206585464U CN 206585464 U CN206585464 U CN 206585464U CN 201720066703 U CN201720066703 U CN 201720066703U CN 206585464 U CN206585464 U CN 206585464U
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Abstract
The utility model provides a kind of buck circuit, including：Power supply；With the master switch of the power sources in series；First diode, the positive pole of first diode is coupled with the negative pole of the power supply, and negative pole is coupled by the positive pole of the master switch and the power supply；Inductance, the first end of the inductance is coupled between the master switch and first diode, second end is coupled to one end of load via load switch, the negative pole of the other end of the load and the power supply is coupled, the buck circuit also includes inductance continued flow component, for when the load switch disconnects, at least constituting continuous current circuit with the inductance.The utility model avoids significantly raising suddenly for inductive drop, the problem of arcing for the mechanical switch being likely to occur, inductor winding insulation harm even cause chopper circuit failure is further overcomed, so as to ensure that the safety of main circuit and switching device.
Description
Technical field
The utility model is related to a kind of reduction voltage circuit, more particularly to a kind of buck circuit.
Background technology
DC chopper circuit is the DC-DC converter that direct current is become to another fixed voltage or adjustable voltage, if
Change the operating frequency of switch, or change the time scale that DC current is switched on and off, it is possible to which change is added in load
Voltage, current average.In DC drive system, charging storage circuit, Switching Power Supply, Technics of Power Electronic Conversion device and various use
Common application is obtained in electric equipment.Chopped wave technique is had been widely used in Switching Power Supply and DC motor drive, is made
It controls to obtain the effect for accelerating steady, quick response, saving electric energy.Buck circuit is the action frequency by adjusting switch
Rate so that the voltage in load is compared with the circuit that supply voltage has declined.
In traditional buck circuit, when load disconnects suddenly, because output inductor electric current can not be mutated,
Easily cause the arcing of mechanical switch, inductor winding insulation harm and even cause chopper circuit failure, to main circuit and derailing switch
Part has severe compromise.
Utility model content
The purpose of this utility model is to provide a kind of buck circuit, can overcome when unexpected disconnect, caused
The unexpected rise problem of inductive drop, further avoids causing the arcing of mechanical switch, the even copped wave of inductor winding insulation harm
Fault.
According to above-mentioned purpose, the utility model provides a kind of buck circuit, and the buck circuit includes：Electricity
Source, the master switch with the power sources in series, by the master switch and the inductance of the supply coupling, is connected with the inductance
Load switch and load, by the first diode of the master switch and the supply coupling, first diode cathode with
The power cathode coupling, the buck circuit also includes inductance continued flow component, for breaking suddenly when the load switch
When opening, the continuous current circuit of the inductance is constituted with the inductance.
In one embodiment, the inductance continued flow component be the second diode, the negative pole of second diode with it is described
Positive source is coupled.
In one embodiment, the inductance continued flow component is electric capacity, described electric capacity one end and the load switch and described
Inductance connection, the other end is connected with the power cathode.
In one embodiment, the load is non-capacitive load.
In one embodiment, the switch is IGBT switches or switch mosfet.
The utility model proposes a kind of buck circuit, by the introducing of inductance continued flow component, when load switch is prominent
So disconnect and beginning, inductance continuous current circuit is provided for inductance, it is to avoid the unexpected of inductive drop is significantly raised, and further overcome can
The problem of arcing for the mechanical switch that can occur, inductor winding insulation harm even cause chopper circuit failure, so as to ensure that
The safety of main circuit and switching device.
Brief description of the drawings
After the detailed description of embodiment of the disclosure is read in conjunction with the following drawings, it better understood when the present invention's
Features described above and advantage.In the accompanying drawings, each component is not necessarily drawn to scale, and with similar correlation properties or feature
Component may have same or like reference.
Fig. 1 shows the circuit diagram of the utility model buck circuit one side；
Fig. 2 shows the circuit waveform figure of the embodiment of buck circuit one；
Fig. 3 shows the circuit diagram of the utility model buck circuit other side；
Fig. 4 shows continuous current circuit when a switch is off；
Fig. 5 shows the continuous current circuit when opening；
Fig. 6 shows the circuit diagram of the utility model buck circuit one embodiment
Embodiment
In order to more fully understand the utility model, the utility model is made below in conjunction with the drawings and specific embodiments to retouch in detail
State.
Fig. 1 is refer to, Fig. 1 shows the circuit diagram of the utility model buck circuit one side, as shown in figure 1,
Buck circuit 10 includes direct-current input power supplying 101, master switch 102, diode 103, inductance 104, load switch 105 and born
Carry 106.Load switch 105 is used for the break-make for controlling load 106, and master switch 102 is used for the stage for controlling direct-current input power supplying 101
Property open and turn off, the negative pole of diode 103 is coupled by the positive pole of master switch 102 and direct-current input power supplying 101, in master switch
During 102 shut-off, the loop afterflow that inductance 104 is made up of load 106, diode 103 with its own.
Inductance induced electromotive force ULElectric current I with flowing through inductanceLAnd there is following relation in the transformation period t of electric current：
As can be seen that the induced electromotive force of copped wave inductance is relevant with the speed of curent change from above formula.
When loading stable connection, buck circuit specific work process is：
1st, master switch 102 is open-minded：Power supply 101 constitutes loop, diode by master switch 102, inductance 104 and load 106
103 bear backward voltage by.Voltage of inductance 104 meets U during thisL=E-Uo, wherein, UoFor the voltage of load 106.
2nd, master switch 102 by：Because the electric current of inductance 104 cannot be mutated, inductance 104 passes through load 106 and diode
103 form continuous current circuit.Voltage of filter inductance 104 meets U during thisL=-Uo, wherein, UoFor the voltage of load 106.
When loading stable connection, the circuit waveform figure of buck circuit 10 as shown in Fig. 2 the lexical or textual analysis respectively marked such as
Under：
Switching pulse：Pulse signal for controlling the break-make of master switch 102；
Us：The both end voltage of master switch 102；
Is：Flow through the circuit total current of master switch 102；
Ul：The voltage at the two ends of inductance 104；
Il：Flow through the electric current of inductance 104；
Ur：Load 106 both end voltages.
Pass through oscillogram as shown in Figure 2, it can be seen that it is negative for 500 volts that 1000 volts of supply voltage is reduced into average
Voltage is carried, it is achieved thereby that the purpose of decompression.
But when loading 106 disconnection suddenly, the voltage dip of inductance 104, the two ends of inductance 104 can produce greatly instantaneous electronic
Therefore gesture, inductance may be ruined, it is also possible to cause load switch 105 disconnect when serious arcing, caused harm to system.
In order to overcome above mentioned problem, it is contemplated that increase continued flow component, the afterflow for constituting inductance with inductance and existing element is returned
Road, for when load disconnects suddenly, power supply sense to be put.
Fig. 3 is referred to, Fig. 3 shows the circuit diagram of the utility model buck circuit other side.In master switch
The second diode 307, the second diode 307 are accessed between 302 and the connection end of the positive pole of direct-current input power supplying 301 and inductance 304
Negative pole be connected with the positive pole of direct-current input power supplying 301.
When load switch 305 disconnects suddenly, the access of the second diode 307 provides continuous current circuit for inductance 304, enters
And be unlikely to trigger above mentioned problem.Fig. 4 and Fig. 5 specifically are refer to, Fig. 4 shows continuous current circuit 410 when a switch is off, schemed
5 show the continuous current circuit 510 when opening.
When circuit general switch 402 is turned off, diode 403, the second diode 407, supply voltage 401, inductance 404 are common
Continuous current circuit 410 is constituted for inductance 404.
When circuit general switch 502 is opened, circuit general switch 502, the second diode 507, inductance 504 are inductance jointly
504 composition continuous current circuits 510.
Due to the effect of continuous current circuit, inductive current rate of change is set to be unlikely to excessive, the induced electromotive force of inductance is controllable
In the range of.
It is appreciated that other inductance continued flow components can also be used to provide continuous current circuit for inductance, in one embodiment, please
Referring to Fig. 6, Fig. 6 shows the circuit diagram of the utility model buck circuit one embodiment, in the base of Fig. 1 chopper circuit
On plinth, 611 are connected in parallel with a capacitor at the two ends of load 606, the effect of afterflow is may also function as.
In the case where load switch 605 disconnects suddenly, when master switch 602 disconnects, electric capacity 611, the pole of inductance 604 and two
Pipe 603 constitutes the continuous current circuit of inductance 604.
In the case where load switch 605 disconnects suddenly, when master switch 602 is opened, electric capacity 611, inductance 604, always open
Close the continuous current circuit of 602 and the composition inductance 604 of supply voltage 601.
In order to avoid electric capacity 611 now forms resonance with load 606, more preferably, load as non-capacitive load.
Master switch in the utility model can be IGBT or MOSFET or an equivalent effect switching device,
For different switching devices, make corresponding replacement to connectivity port.
It in Power Diode Pumped, practical application can also have with Power Diode Pumped that diode in the utility model, which can be,
Other devices of equivalent effect.
In summary, the utility model passes through inductance continuous current circuit setting, it is to avoid when load disconnects suddenly, inductance
The unexpected rise of voltage, further avoid caused switch arcing or main circuit device failure when inductive drop is raised suddenly
Potential safety hazard, improve system reliability.
It is for so that any person skilled in the art all can make or use this public affairs to provide of this disclosure be previously described
Open.Various modifications of this disclosure all will be apparent for a person skilled in the art, and as defined herein general
Suitable principle can be applied to spirit or scope of other variants without departing from the disclosure.Thus, the disclosure is not intended to be limited
Due to example described herein and design, but it should be awarded and principle disclosed herein and novel features phase one
The widest scope of cause.
Claims (5)
1. a kind of buck circuit, it is characterised in that the buck circuit includes：Power supply；With the power sources in series
Master switch；First diode, the positive pole of first diode is coupled with the negative pole of the power supply, and negative pole passes through the master switch
Coupled with the positive pole of the power supply；Inductance, the first end of the inductance be coupled to the master switch and first diode it
Between, the second end is coupled to one end of load via load switch, and the negative pole of the other end of the load and the power supply is coupled, institute
Stating buck circuit also includes inductance continued flow component, for when the load switch disconnects, at least being constituted with the inductance
Continuous current circuit.
2. buck circuit as claimed in claim 1, it is characterised in that the inductance continued flow component is the second diode,
The negative pole of second diode is coupled between the power supply and the master switch, second end of positive pole and the inductance
Coupling, wherein, when the master switch is open-minded, and the load switch disconnects, second diode and the inductance and institute
State master switch and constitute continuous current circuit, when master switch shut-off, when the load switch disconnects, second diode with it is described
Inductance and the power supply and first diode constitute continuous current circuit.
3. buck circuit as claimed in claim 1, it is characterised in that the inductance continued flow component is electric capacity, the electricity
One end of appearance and second end of the inductance are coupled, and the negative pole of the other end and the power supply is coupled, wherein when the load
When switching off, the electric capacity constitutes continuous current circuit with the inductance and first diode.
4. buck circuit as claimed in claim 3, it is characterised in that the load is non-capacitive load.
5. buck circuit as claimed in claim 1, it is characterised in that the master switch is that IGBT is switched or MOSFET is opened
Close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720066703.3U CN206585464U (en) | 2017-01-18 | 2017-01-18 | A kind of buck circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720066703.3U CN206585464U (en) | 2017-01-18 | 2017-01-18 | A kind of buck circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206585464U true CN206585464U (en) | 2017-10-24 |
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ID=60110252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720066703.3U Active CN206585464U (en) | 2017-01-18 | 2017-01-18 | A kind of buck circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN206585464U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024026915A1 (en) * | 2022-08-03 | 2024-02-08 | 海宁纳安智能驱动有限公司 | Multi-stage speed adjustment device for sofa push rods |
-
2017
- 2017-01-18 CN CN201720066703.3U patent/CN206585464U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024026915A1 (en) * | 2022-08-03 | 2024-02-08 | 海宁纳安智能驱动有限公司 | Multi-stage speed adjustment device for sofa push rods |
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