CN107317480B - A kind of energy feedback type essential safety Buck circuit - Google Patents
A kind of energy feedback type essential safety Buck circuit Download PDFInfo
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- CN107317480B CN107317480B CN201710492601.2A CN201710492601A CN107317480B CN 107317480 B CN107317480 B CN 107317480B CN 201710492601 A CN201710492601 A CN 201710492601A CN 107317480 B CN107317480 B CN 107317480B
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- 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
- H02M3/1584—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 with a plurality of power processing stages connected in parallel
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of energy feedback type essential safety Buck circuits, including power supply Vi, switching transistor M1, inductance L, capacitor C, diode D and resistance R, above-mentioned each component constitute Buck circuit, further include control unit, detection circuit, comparison circuit, logic control circuit and switching circuit；The switching circuit is connected with inductance L, and detection circuit is electrically connected with inductance L, and comparison circuit is electrically connected with detection circuit and switching circuit；Logic control circuit is electrically connected with comparison circuit, and logic control circuit is electrically connected with control unit and switching transistor M1.The present invention devises a kind of energy feedback type essential safety Buck circuit, i.e., when inductance both ends are opened a way, will not ignite explosive gas, while by the energy feedback on inductance L to power supply.Specifically, being just to maintain under the normal function of former Buck circuit, the spark energy that inductance open circuit generates is fed back into power supply, not only can quickly extinguish electric arc, and realize the saving of energy.
Description
Technical field
The present invention relates to a kind of Buck circuit, in particular to a kind of energy feedback type essential safety Buck circuit belongs to anti-
Quick-fried electrical safety technical field.
Background technique
Buck circuit as shown in Figure 1, wherein ViIt is rechargable power supplies, when open circuit event occur in the inductance both ends of Buck circuit
When barrier, since the electric current of inductance cannot be mutated, counter electromotive force can be generated at inductance both ends, occur high pressure at open circuit, puncture air,
Electric arc is generated, so as to ignite explosive gas.For essential safety performance angle, needs using inhibition and extinguish open circuit
The method of electric arc makes circuit reach essential safety performance.
For traditional inductive circuit, when inductance both ends are opened a way, inductance both ends anti-paralleled diode is generallyd use
Method.When inductance both ends are opened a way, the polarity of voltage at inductance both ends changes, and makes anti-paralleled diode by reversely cutting
Only become forward conduction, inductive current passes through anti-paralleled diode afterflow.
But for Buck circuit, within a duty cycle, when closing the switch, inductive current rises, and switch is disconnected
When opening, inductive current declines, and the polarity of both of these case inductive drop is opposite.When inductance both ends open circuit, according to inverse parallel
The method of diode, then circuit cisco unity malfunction, therefore the method that anti-paralleled diode afterflow cannot be used.
Summary of the invention
The object of the present invention is to provide a kind of energy feedback type essential safety Buck circuits, which can not only be quick
Extinguish electric arc, and realizes the saving of energy.
To achieve the above object, the technical solution adopted by the present invention is, a kind of energy feedback type essential safety Buck electricity
Road, including power supply Vi, switching transistor M1, inductance L, capacitor C, diode D and resistance R, above-mentioned each component constitute
Buck circuit further includes control unit, detection circuit, comparison circuit, logic control circuit and switching circuit；The switch electricity
Road is connected with inductance L, and detection circuit is electrically connected with inductance L, and comparison circuit is electrically connected with detection circuit and switching circuit；Logic control
Circuit processed is electrically connected with comparison circuit, and logic control circuit is electrically connected with control unit and switching transistor M1.
Preferably, the detection circuit is made of diode D1 and D2, the comparison circuit is by comparator U1 and U3, anti-
Phase device U2 and Schmidt trigger U4 composition, the logic control circuit be with door U5, switching circuit be switching transistor M2.
The anode of the diode D1 is connect with one end of inductance L, the cathode and power supply V of diode D1iAnode connection；
The cathode of the diode D2 is connect with the other end of inductance L, and the anode of diode D2 is connect with the source electrode of switching transistor M1.
The non-inverting input terminal of the comparator U1 is in the anode connection of diode D1, and inverting input terminal is with diode D1's
Cathode connection, output end are connect with phase inverter U2；The non-inverting input terminal of the comparator U3 is connect with the anode of diode D2,
Its inverting input terminal is connect with the cathode of diode D2, and output end is connect with the positive input of Schmidt trigger U4.
Described is three input terminals and door with door U5, one of input terminal respectively with the output end of Schmidt trigger U4 with
And the grid connection of switching transistor M2, another input terminal are electrically connected with phase inverter U2, the last one input terminal and control are single
Member electrical connection；It is connect with the output end of door U5 with the grid of switching transistor M1.
The drain electrode of switching transistor M2 is connect with inductance L, and source electrode meets output VOUT, the switching transistor M1 and M2 is
NMOS transistor.
In the present invention, default high level voltage is 5V, and low level 0V, comparator is powered using single supply, therefore is compared
Device output cannot be negative pressure.Schmidt trigger U4 tool takes+Uth=4V ,-Uth=- there are two threshold voltage+Uth and-Uth
1V.The wherein starting working condition of Schmidt trigger U4 are as follows: input voltage is less than positive threshold+Uth, exports as high level.
When circuit works normally, equal no current flows through on diode D1 and D2, and comparator U1 and U3 input voltage is zero,
Therefore output low level, after inverted device U2 and Schmidt trigger U4 output be high level, high level and control signal phase and, it is defeated
Identical as control signal out, the function of primary circuit may be implemented in circuit.
When inductance L opens a way, there are mainly two types of states, i.e., when inductance L right end is opened a way:
At this point, diode D1 is connected, the input voltage of comparator U1 is the pressure drop of diode D1, high level is exported, through anti-
Become low level after phase device U2, by with after door U5 still output be low level, switching transistor M1 is turned off, is cut off the power.
Electric current on inductance L can only be flowed back by sustained diode 1 and D to power supply, be equivalent at this time to power source charges.
Therefore for the both ends at open circuit, left end is by diode D, power supply Vi, diode D1 and inductance L constitute feedback afterflow
Circuit, the voltage that energy feedback terminates at inductance L right end are identical with supply voltage；Right end constitutes oscillation by resistance R and capacitor C and declines
Powered down road, without any energy injection at open circuit, electric arc extinguishes naturally, will not pilot gas, realize protection and energy feedback function
Energy.
When the left end inductance L is opened a way:
At this point, diode D2 is connected, the input voltage of comparator U3 is the pressure drop of diode D2, exports as high level, reaches
Output is low level after to the forward threshold voltage+Uth of Schmidt trigger U4, turns off switching transistor M2.Meanwhile making and door
U5 output is low level, turns off switching transistor M1.Working condition is consistent with the situation that inductance right end is opened a way at this time, inductance
Upper electric current can only be flowed back by sustained diode 1 and D to power supply.
For left end at open circuit, switching transistor M1 shutdown, right end is by diode D, power supply Vi, diode D1, inductance L structure
At feedback freewheeling circuit, it is identical with supply voltage that energy feedback terminates at inductance L right end voltage, infuses at open circuit without any energy
Enter, electric arc extinguishes naturally, will not pilot gas, realize protection and energy feedback function.
Beneficial effects of the present invention: the present invention devises a kind of energy feedback type essential safety Buck circuit, i.e. inductance two
When end is opened a way, explosive gas will not be ignited, while by the energy feedback on inductance L to power supply.Specifically, being exactly to protect
Under the normal function for holding former Buck circuit, the spark energy that inductance open circuit generates is fed back into power supply, not only can quickly extinguish electricity
Arc, and realize the saving of energy.
Detailed description of the invention
It, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of technical solution of the present invention
The attached drawing used is briefly described.
Fig. 1 is Buck circuit diagram in the prior art；
Fig. 2 is energy-feedback essential safety Buck circuit diagram of the present invention；
Fig. 3 is the circuit diagram of energy-feedback essential safety Buck circuit of the present invention；
Fig. 4 is the circuit diagram of the embodiment of the present invention two；
Fig. 5 is the circuit diagram of the embodiment of the present invention three；
Fig. 6 is Buck circuit inductance of the present invention open circuit transient process figure；
In figure: 1. control units, 2. detection circuits, 3. comparison circuits, 4. logic control circuits, 5. switching circuits.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with embodiment pair
Technical solution in the application is clearly and completely described.
As shown in Fig. 2, for the invention discloses a kind of energy feedback type essential safety Buck circuit, including power supply Vi、
Switching transistor M1, inductance L, capacitor C, diode D and resistance R, above-mentioned each component constitute Buck circuit, further include control
Unit 1, detection circuit 2, comparison circuit 3, logic control circuit 4 and switching circuit 5 processed；The switching circuit 5 and inductance L goes here and there
Connection, detection circuit 2 are electrically connected with inductance L, and comparison circuit 3 is electrically connected with detection circuit 2 and switching circuit 5；Logic control circuit 4
It is electrically connected with comparison circuit 3, and logic control circuit 4 is electrically connected with control unit 1 and switching transistor M1.
As shown in figure 3, physical circuit of the invention are as follows: the detection circuit is made of diode D1 and D2, the comparison
Circuit is made of comparator U1 and U3, phase inverter U2 and Schmidt trigger U4, the logic control circuit be with door U5, open
Powered-down road is switching transistor M2.
The anode of the diode D1 is connect with one end of inductance L, the cathode and power supply V of diode D1iAnode connection；
The cathode of the diode D2 is connect with the other end of inductance L, and the anode of diode D2 is connect with the source electrode of switching transistor M1.
The non-inverting input terminal of the comparator U1 is in the anode connection of diode D1, and inverting input terminal is with diode D1's
Cathode connection, output end are connect with phase inverter U2；The non-inverting input terminal of the comparator U3 is connect with the anode of diode D2,
Its inverting input terminal is connect with the cathode of diode D2, and output end is connect with the positive input of Schmidt trigger U4.
Described is three input terminals and door with door U5, one of input terminal respectively with the output end of Schmidt trigger U4 with
And the grid connection of switching transistor M2, another input terminal are electrically connected with phase inverter U2, the last one input terminal and control are single
Member electrical connection；It is connect with the output end of door U5 with the grid of switching transistor M1.
The drain electrode of the switching transistor M2 is connect with inductance L, and source electrode meets output VOUT, the switching transistor M1 and
M2 is NMOS transistor.
Embodiment one
As shown in figure 3, when circuit works normally:
Inductance L does not open a way, and since this circuit is Buck circuit, input voltage is higher than output voltage, so diode
D1 is not turned on, and no electric current flows through on diode D1 at this time, and the end in the same direction of comparator U1 is output voltage Vout, and it is reversed
Input terminal is input voltage Vi；Obviously, reverse input end voltage is greater than noninverting input, and comparator U1 output is low level, warp
Become high level after crossing phase inverter U2.To on the left of inductance L, diode D2 short circuit, i.e. the end voltage in the same direction of comparator U3 and reversed
End voltage is equal, therefore comparator U3 output is low level, at this time the not up to positive threshold+Uth of Schmidt trigger U4, therefore defeated
High level out.At this moment, two high level and control signal phase are identical with control signal as, U5 output, therefore the normal work of Buck circuit
Make.
Embodiment two
As shown in figure 4, when inductance L right end open circuit:
Since the electric current at the both ends inductance L cannot be mutated, pass through diode D1, power supply ViWith diode D afterflow, or pass through
Diode D1 and switching transistor M1 afterflow.No matter which kind of situation, diode D1 is necessarily connected, and generates forward voltage drop, compares at this time
End voltage in the same direction compared with device U1 is greater than backward end voltage, and comparator U1 exports high level, becomes low level after phase inverter U2,
By still exporting as low level with after door U5.I.e. the grid of switching transistor M1 is low level, and switching transistor M1 ends,
So when electric current can only by diode D1 and diode D to power source charges.
No current flows through on diode D2 at this time, and the input voltage in the same direction and reversed of comparator U3 is equal, and is zero, output
For low level, high level is exported after Schmidt trigger U4, driving switch transistor M2 is worked normally.And output high level,
Do not influence the output with door U5, so when have no effect on circuit function.
When opening a way on the right side of inductance L, the right end of open-circuit arc, resistance R and capacitor C constitute oscillatory extinction circuit；It is left
End is by diode D, power supply Vi, diode D1, inductance L constitute feedback freewheeling circuit, and energy feedback terminates at the electricity of inductance L right end
It presses identical with supply voltage.Without any energy injection at open circuit, electric arc quickly extinguishes, and realizes energy feedback.Both it protected
Circuit, and saved the energy.
As shown in fig. 6, left side thickened portion is closing for energy feedback in Fig. 6 for Buck circuit inductance open circuit transient state mistake
Circuit is closed, wherein defining electric current positive direction, right side thickened portion is RC oscillatory extinction circuit.
Embodiment three
As shown in figure 5, when Buck circuit inductance left end is opened a way:
Firstly, circuit works normally when inductance L does not open a way；After inductance left end is opened a way, it is equivalent to out at this time
It closes transistor M1 to disconnect, this process and normal Buck circuit working method are closely similar.
When opening a way on the left of inductance L, diode D2 conducting generates forward voltage drop, and comparator U3 exports high level, reaches
To after the threshold voltage+Uth of Schmidt trigger U4, Schmidt trigger U4 output is low level.On the one hand shutdown switch is brilliant
Body pipe M2, on the other hand by with export low level after door U5, turn off M1.The electric current on diode D2 is turned off again at this time, right
In Schmidt trigger U4, only input voltage is less than-Uth, could export high level again.Again because comparator is using single electricity
Source power supply, described comparator U3 cannot export negative pressure, so that it is guaranteed that M2 and M1 shutdown.The working method of circuit and inductance L at this time
Right side is the same there is a situation where opening a way, and the energy on inductance L, to power source charges, loads and disappears inside R and C by diode D1 and D
Energy consumption.At open circuit, the left and right sides has no energy injection, and electric arc is quickly extinguished, and protects circuit, and realizes energy and return
Feedback.
Described embodiment is a part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
It shall fall within the protection scope of the present invention.
Claims (7)
1. a kind of energy feedback type essential safety Buck circuit, including power supply Vi, switching transistor M1, inductance L, capacitor C, two poles
Pipe D and resistance R, above-mentioned each component constitute Buck circuit, which is characterized in that further include control unit (1), detection circuit
(2), comparison circuit (3), logic control circuit (4) and switching circuit (5)；The switching circuit (5) is connected with inductance L, inspection
Slowdown monitoring circuit (2) is electrically connected with inductance L, and comparison circuit (3) is electrically connected with detection circuit (2) and switching circuit (5)；Logic control electricity
Road (4) is electrically connected with comparison circuit (3), and logic control circuit (4) is electrically connected with control unit (1) and switching transistor M1,
The detection circuit (2) is made of diode D1 and D2, the comparison circuit (3) by comparator U1 and U3, phase inverter U2 and
Schmidt trigger U4 composition, the logic control circuit (4) be with door U5, switching circuit (5) be switching transistor M2.
2. energy feedback type essential safety Buck circuit according to claim 1, which is characterized in that the diode D1's
Anode is connect with one end of inductance L, the cathode and power supply V of diode D1iAnode connection；The cathode and electricity of the diode D2
Feel the other end connection of L, the anode of diode D2 is connect with the source electrode of switching transistor M1.
3. energy feedback type essential safety Buck circuit according to claim 2, which is characterized in that the comparator U1's
In the anode connection of diode D1, inverting input terminal connect non-inverting input terminal with the cathode of diode D1, output end with instead
The U2 connection of phase device；The non-inverting input terminal of the comparator U3 is connect with the anode of diode D2, inverting input terminal and diode
The cathode of D2 connects, and output end is connect with the positive input of Schmidt trigger U4.
4. energy feedback type essential safety Buck circuit according to claim 1-3, which is characterized in that it is described with
Door U5 be three input terminals and door, one of input terminal respectively with the output end of Schmidt trigger U4 and switching transistor M2
Grid connection, another input terminal is electrically connected with phase inverter U2, the last one input terminal is electrically connected with control unit (1)；With
The output end of door U5 is connect with the grid of switching transistor M1.
5. energy feedback type essential safety Buck circuit according to claim 4, which is characterized in that switching transistor M2's
Drain electrode is connect with inductance L, and source electrode meets output VOUT。
6. energy feedback type essential safety Buck circuit according to claim 5, which is characterized in that the switching transistor
M1 and M2 is NMOS transistor.
7. energy feedback type essential safety Buck circuit according to claim 6, which is characterized in that the comparator U1 and
U3 is powered using single supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710492601.2A CN107317480B (en) | 2017-06-26 | 2017-06-26 | A kind of energy feedback type essential safety Buck circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710492601.2A CN107317480B (en) | 2017-06-26 | 2017-06-26 | A kind of energy feedback type essential safety Buck circuit |
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| CN107317480A CN107317480A (en) | 2017-11-03 |
| CN107317480B true CN107317480B (en) | 2019-04-02 |
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| CN116799915B (en) * | 2023-06-29 | 2023-12-29 | 航天锂电科技(江苏)有限公司 | Voltage reduction equalization circuit of lithium battery pack and control method thereof |
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| CN103887787A (en) * | 2014-01-29 | 2014-06-25 | 北方工业大学 | Arc extinguishing method of intrinsically safe inductive circuit |
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| CN202276289U (en) * | 2011-11-03 | 2012-06-13 | 中国矿业大学(北京) | Intrinsically safe output quasi-Z-source switching converter |
| CN102386761A (en) * | 2011-11-03 | 2012-03-21 | 中国矿业大学(北京) | Intrinsic safety output quasi-Z-source switching converter |
| CN202906766U (en) * | 2012-04-28 | 2013-04-24 | 中国航天科技集团公司烽火机械厂 | Mining intrinsic-safe power supply |
| CN103795280A (en) * | 2014-02-21 | 2014-05-14 | 广州中逸光电子科技有限公司 | Essential safety power source |
| CN205792277U (en) * | 2016-05-30 | 2016-12-07 | 浙江理工大学 | A kind of mine direct current essential safety source circuit |
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| US4734839A (en) * | 1987-03-23 | 1988-03-29 | Barthold Fred O | Source volt-ampere/load volt-ampere differential converter |
| CN103887787A (en) * | 2014-01-29 | 2014-06-25 | 北方工业大学 | Arc extinguishing method of intrinsically safe inductive circuit |
| CN106383545A (en) * | 2016-12-05 | 2017-02-08 | 北方工业大学 | Spark discharge constant-power arc extinguishing method of intrinsically safe Buck circuit |
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| 本质安全开关变换器基础理论及关键技术研究;刘树林;《中国博士学位论文全文数据库 信息科技II辑》;20081215;全文 |
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