CN107317480A - Energy feedback type intrinsic safety Buck circuit - Google Patents
Energy feedback type intrinsic safety Buck circuit Download PDFInfo
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- CN107317480A CN107317480A CN201710492601.2A CN201710492601A CN107317480A CN 107317480 A CN107317480 A CN 107317480A CN 201710492601 A CN201710492601 A CN 201710492601A CN 107317480 A CN107317480 A CN 107317480A
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- switching transistor
- inductance
- feedback type
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000002360 explosive Substances 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 238000010891 electric arc Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 230000002459 sustained effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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
- 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)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an energy feedback type intrinsic safety Buck circuit which comprises a power supply ViThe Buck circuit comprises a switching transistor M1, an inductor L, a capacitor C, a diode D and a resistor R, wherein the Buck circuit comprises a control unit and a detectorThe circuit comprises a detection circuit, a comparison circuit, a logic control circuit and a switch circuit; the switch circuit is connected with the inductor L in series, the detection circuit is electrically connected with the inductor L, and the comparison circuit is electrically connected with the detection circuit and the switch circuit; the logic control circuit is electrically connected with the comparison circuit, and the logic control circuit is electrically connected with the control unit and the switching transistor M1. The invention designs an energy feedback type intrinsic safety Buck circuit, namely, when the two ends of an inductor are open-circuited, explosive gas cannot be detonated, and energy on the inductor L is fed back to a power supply. Specifically, under the normal function of the original Buck circuit, the energy of the spark generated by the open circuit of the inductor is fed back to the power supply, so that the arc can be quickly extinguished, and the energy is saved.
Description
Technical field
The present invention relates to a kind of Buck circuits, more particularly to a kind of energy feedback type essential safety Buck circuits belong to anti-
Quick-fried electrical safety technical field.
Background technology
Buck circuits as shown in Figure 1, wherein ViIt is rechargable power supplies, when open circuit event occur in the inductance two ends of Buck circuits
During barrier, because the electric current of inductance can not be mutated, it can be produced at inductance two ends at counter electromotive force, open circuit and high pressure occur, puncture air,
Electric arc is produced, so as to ignite explosive gas., it is necessary to using suppression and extinguish open circuit for essential safety performance angle
The method of electric arc, makes circuit reach essential safety performance.
For traditional inductive circuit, when inductance two ends are opened a way, generally using inductance two ends anti-paralleled diode
Method.When inductance two ends are opened a way, the polarity of voltage at inductance two ends changes, and makes anti-paralleled diode by reversely cutting
Only it is changed into forward conduction, inductive current passes through anti-paralleled diode afterflow.
But for Buck circuits, within a work period, during switch closure, inductive current rises, and switch is disconnected
When opening, inductive current declines, the opposite polarity of both of these case inductive drop.When inductance two ends are opened a way, according to inverse parallel
The method of diode, then circuit cisco unity malfunction, therefore the method that anti-paralleled diode afterflow can not be used.
The content of the invention
It is an object of the present invention to provide a kind of energy feedback type essential safety Buck circuits, the circuit can not only be quick
Extinguish electric arc, and realize 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, electric capacity C, diode D and resistance R, above-mentioned each component constitutes
Buck circuits, in addition to control unit, detection circuit, comparison circuit, logic control circuit and on-off 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 on-off 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 up 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, on-off circuit be switching transistor M2.
The positive pole of the diode D1 is connected with inductance L one end, diode D1 negative pole and power supply ViPositive pole connection；
The negative pole of the diode D2 is connected with the inductance L other end, and diode D2 positive pole is connected with switching transistor M1 source electrode.
The in-phase input end of the comparator U1 is connected in diode D1 positive pole, and its inverting input is with diode D1's
Negative pole is connected, and its output end is connected with phase inverter U2；The in-phase input end of the comparator U3 is connected with diode D2 positive pole,
Its inverting input is connected with diode D2 negative pole, and its output end is connected with Schmidt trigger U4 positive input.
Described is three inputs and door with door U5, one of input respectively with Schmidt trigger U4 output end with
And switching transistor M2 grid is connected, another input is electrically connected with phase inverter U2, and last input is single with control
Member electrical connection；It is connected with door U5 output end with switching transistor M1 grid.
Switching transistor M2 drain electrode is connected with inductance L, and its source electrode meets output VOUT, the switching transistor M1 and M2 is
Nmos pass transistor.
In the present invention, acquiescence high level voltage is 5V, and low level is 0V, and comparator is powered using single supply, therefore is compared
Device output can not be negative pressure.Schmidt trigger U4 has two threshold voltage+Uth and-Uth, takes+Uth=4V ,-Uth=-
1V.Wherein Schmidt trigger U4 starting working condition is：Input voltage is less than positive threshold+Uth, is output as high level.
When circuit normal work, equal no current flows through on diode D1 and D2, and comparator U1 and U3 input voltage is zero,
Therefore output low level, be output as high level after inverted device U2 and Schmidt trigger U4, high level and control signal phase and, it is defeated
Go out identical with control signal, circuit can realize the function of primary circuit.
When inductance L opens a way, mainly there are two states, i.e., when inductance L right-hand members are opened a way：
Now, diode D1 is turned on, and comparator U1 input voltage is diode D1 pressure drop, high level is exported, through anti-
It is changed into low level after phase device U2, by with being still output as low level after door U5, switching transistor M1 being turned off, cut off the electricity supply.
Electric current on inductance L can only be flowed back to power supply, now equivalent to power source charges by sustained diode 1 and D.
Therefore for the two 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-hand members is identical with supply voltage；Right-hand member constitutes vibration by resistance R and electric capacity C and declined
Without any energy injection at powered down road, open circuit, electric arc extinguishes naturally, will not pilot gas, realize protection and energy feedback work(
Energy.
When inductance L left ends are opened a way：
Now, diode D2 is turned on, and comparator U3 input voltage is diode D2 pressure drop, is output as high level, reaches
Low level, shut-off switching transistor M2 are output as after to Schmidt trigger U4 forward threshold voltage+Uth.Meanwhile, make and door
U5 is output as low level, shut-off switching transistor M1.Now working condition is consistent with the situation that inductance right-hand member is opened a way, 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 shut-offs, right-hand member is by diode D, power supply Vi, diode D1, inductance L structures
Into feedback freewheeling circuit, it is identical with supply voltage that energy feedback terminates at inductance L right-hand member voltages, is noted 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 circuits, 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, exactly protect
Under the normal function for holding former Buck circuits, the spark energy produced that inductance is opened a way feeds back to power supply, not only can quickly extinguish electricity
Arc, and realize the saving of energy.
Brief description of the drawings
, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of technical scheme
The accompanying drawing used is briefly described.
Fig. 1 is Buck circuit diagrams of the prior art；
Fig. 2 is energy-feedback essential safety Buck circuit diagrams of the present invention；
Fig. 3 is the circuit theory diagrams of energy-feedback essential safety Buck circuits of the present invention；
Fig. 4 is the circuit theory diagrams of the embodiment of the present invention two；
Fig. 5 is the circuit theory diagrams of the embodiment of the present invention three；
Fig. 6 is Buck circuit inductances of the present invention open circuit transient process figure；
In figure：1. control unit, 2. detection circuits, 3. comparison circuits, 4. logic control circuits, 5. on-off circuits.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, below in conjunction with embodiment pair
Technical scheme 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 circuits, including power supply Vi、
Switching transistor M1, inductance L, electric capacity C, diode D and resistance R, above-mentioned each component constitute Buck circuits, in addition to control
Unit 1 processed, detection circuit 2, comparison circuit 3, logic control circuit 4 and on-off circuit 5；The on-off circuit 5 is gone here and there with inductance L
Connection, detection circuit 2 is electrically connected with inductance L, and comparison circuit 3 is electrically connected with detection circuit 2 and on-off circuit 5；Logic control circuit 4
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, the physical circuit of the present invention is：The detection circuit is made up of diode D1 and D2, the comparison
Circuit is made up 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 positive pole of the diode D1 is connected with inductance L one end, diode D1 negative pole and power supply ViPositive pole connection；
The negative pole of the diode D2 is connected with the inductance L other end, and diode D2 positive pole is connected with switching transistor M1 source electrode.
The in-phase input end of the comparator U1 is connected in diode D1 positive pole, and its inverting input is with diode D1's
Negative pole is connected, and its output end is connected with phase inverter U2；The in-phase input end of the comparator U3 is connected with diode D2 positive pole,
Its inverting input is connected with diode D2 negative pole, and its output end is connected with Schmidt trigger U4 positive input.
Described is three inputs and door with door U5, one of input respectively with Schmidt trigger U4 output end with
And switching transistor M2 grid is connected, another input is electrically connected with phase inverter U2, and last input is single with control
Member electrical connection；It is connected with door U5 output end with switching transistor M1 grid.
The drain electrode of the switching transistor M2 is connected with inductance L, and its source electrode meets output VOUT, the switching transistor M1 and
M2 is nmos pass transistor.
Embodiment one
As shown in figure 3, when circuit normal work：
Inductance L does not open a way, and because this circuit is Buck circuits, input voltage is higher than output voltage, so diode
D1 is not turned on, and now no electric current flows through on diode D1, and comparator U1 end in the same direction is output voltage Vout, and it is reverse
Input is input voltage Vi；Obviously, reverse input end voltage is more than input in the same direction, and comparator U1 is output as low level, passes through
It is changed into high level after crossing phase inverter U2.To on the left of inductance L, diode D2 short circuits, i.e. comparator U3 terminal voltage in the same direction and reversely
Terminal voltage is equal, therefore comparator U3 is output as low level, now not up to Schmidt trigger U4 positive threshold+Uth, therefore defeated
Go out high level.At this moment, two high level and control signal phase with U5 outputs are identical with control signal, therefore the normal work of Buck circuits
Make.
Embodiment two
As shown in figure 4, when inductance L right-hand members are opened a way：
Because the electric current at inductance L two ends can not be mutated, pass through diode D1, power supply ViWith diode D afterflows, or pass through
Diode D1 and switching transistor M1 afterflows.No matter which kind of situation, diode D1 necessarily turns on, and produces forward voltage drop, now compares
Terminal voltage in the same direction compared with device U1 is more than reverse terminal voltage, and comparator U1 output high level is changed into low level after phase inverter U2,
By with after door U5, being still output as low level.I.e. switching transistor M1 grid is low level, and switching transistor M1 ends,
So when electric current can only by diode D1 and diode D to power source charges.
Now no current flows through on diode D2, and comparator U3 input voltage in the same direction and reverse is equal, and is zero, output
For low level, high level, driving switch transistor M2 normal works are exported after Schmidt trigger U4.And output high level,
Do not influence the output with door U5, so when have no effect on circuit function.
When being opened a way on the right side of inductance L, the right-hand member of open-circuit arc, resistance R and electric capacity C constitute oscillatory extinction circuit；It is left
End is by diode D, power supply Vi, diode D1, inductance L constitutes feedback freewheeling circuit, and energy feedback terminates at the electricity of inductance L right-hand members
Pressure is identical with supply voltage.Without any energy injection at open circuit, electric arc quickly extinguishes, and realizes energy feedback.Both protected
Circuit, has saved the energy again.
As shown in fig. 6, being opened a way transient state mistake for Buck circuit inductances, left side thickened portion is closing for energy feedback in Fig. 6
Circuit is closed, wherein defining electric current positive direction, right side thickened portion is RC oscillatory extinction circuits.
Embodiment three
As shown in figure 5, when Buck circuit inductance left ends are opened a way：
First, when inductance L does not open a way, circuit normal work；After inductance left end is opened a way, now equivalent to opening
Close transistor M1 to disconnect, this process and normal Buck circuits working method are closely similar.
When being opened a way on the left of inductance L, diode D2 conductings produce forward voltage drop, and comparator U3 output high level reaches
To after Schmidt trigger U4 threshold voltage+Uth, Schmidt trigger U4 is output as low level.On the one hand shut-off switch is brilliant
Body pipe M2, on the other hand by with exporting low level after door U5, turning off M1.Now the electric current on diode D2 is turned off again, right
In Schmidt trigger U4, only input voltage is less than-Uth, high level could be exported again.Again because comparator is using single electricity
Source powers, and described comparator U3 can not export negative pressure, so that it is guaranteed that M2 and M1 shut-offs.The now working method of circuit and inductance L
The situation that right side is opened a way is the same, and the energy on inductance L, to power source charges, is loaded and disappeared 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, protection circuit, and realizes energy time
Feedback.
Described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made,
Belong to the scope of protection of the invention.
Claims (8)
1. a kind of energy feedback type essential safety Buck circuits, including power supply Vi, switching transistor M1, inductance L, electric capacity C, two poles
Pipe D and resistance R, above-mentioned each component constitutes Buck circuits, it is characterised in that also including control unit (1), detection circuit
(2), comparison circuit (3), logic control circuit (4) and on-off circuit (5)；The on-off 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 on-off 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.
2. energy feedback type essential safety Buck circuits according to claim 1, it is characterised in that the detection circuit
(2) it is made up of diode D1 and D2, the comparison circuit (3) is by comparator U1 and U3, phase inverter U2 and Schmidt trigger
U4 constitute, the logic control circuit (4) be with door U5, on-off circuit (5) be switching transistor M2.
3. energy feedback type essential safety Buck circuits according to claim 2, it is characterised in that the diode D1's
Positive pole is connected with inductance L one end, diode D1 negative pole and power supply ViPositive pole connection；The negative pole of the diode D2 and electricity
Feel L other end connection, diode D2 positive pole is connected with switching transistor M1 source electrode.
4. energy feedback type essential safety Buck circuits according to claim 3, it is characterised in that the comparator U1's
In-phase input end is connected in diode D1 positive pole, and its inverting input be connected with diode D1 negative pole, its output end and instead
The U2 connections of phase device；The in-phase input end of the comparator U3 is connected with diode D2 positive pole, its inverting input and diode
D2 negative pole connection, its output end is connected with Schmidt trigger U4 positive input.
5. the energy feedback type essential safety Buck circuits according to claim any one of 1-4, it is characterised in that it is described with
Door U5 is three inputs and door, the output end and switching transistor M2 of one of input respectively with Schmidt trigger U4
Grid connection, another input electrically connected with phase inverter U2, and last input is electrically connected with control unit (1)；With
Door U5 output end is connected with switching transistor M1 grid.
6. energy feedback type essential safety Buck circuits according to claim 5, it is characterised in that switching transistor M2's
Drain electrode is connected with inductance L, and its source electrode meets output VOUT。
7. energy feedback type essential safety Buck circuits according to claim 6, it is characterised in that the switching transistor
M1 and M2 is nmos pass transistor.
8. energy feedback type essential safety Buck circuits according to claim 7, it is characterised in that the comparator U1 and
U3 is powered using single supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710492601.2A CN107317480B (en) | 2017-06-26 | 2017-06-26 | A kind of energy feedback type essential safety Buck circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710492601.2A CN107317480B (en) | 2017-06-26 | 2017-06-26 | A kind of energy feedback type essential safety Buck circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107317480A true CN107317480A (en) | 2017-11-03 |
| CN107317480B CN107317480B (en) | 2019-04-02 |
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| CN201710492601.2A Active CN107317480B (en) | 2017-06-26 | 2017-06-26 | A kind of energy feedback type essential safety Buck circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116799915A (en) * | 2023-06-29 | 2023-09-22 | 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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| CN116799915A (en) * | 2023-06-29 | 2023-09-22 | 航天锂电科技(江苏)有限公司 | Voltage reduction equalization circuit of lithium battery pack and control method thereof |
| 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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| Publication number | Publication date |
|---|---|
| CN107317480B (en) | 2019-04-02 |
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