CN106998135B - A kind of essential safety Buck circuit - Google Patents
A kind of essential safety Buck circuit Download PDFInfo
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- CN106998135B CN106998135B CN201710255704.7A CN201710255704A CN106998135B CN 106998135 B CN106998135 B CN 106998135B CN 201710255704 A CN201710255704 A CN 201710255704A CN 106998135 B CN106998135 B CN 106998135B
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- mosfet pipe
- circuit
- inductance
- output end
- input terminal
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application provides a kind of essential safety Buck circuit.The circuit includes: Buck circuit, including power supply, the first MOSFET pipe, diode, inductance, capacitor, resistance；Inductance bypass branch；Switch unit, including the 2nd MOSFET pipe, the 3rd MOSFET pipe, the 2nd MOSFET pipe are connected on inductance bypass branch, and the 3rd MOSFET pipe is connected with the capacitor；Driving unit, including input terminal are detected, it further includes output end that the input terminal, which is used to detect the open circuit or short circuit of the Buck circuit, and the output end is used to control the on or off of the MOSFET pipe.Using embodiment each in the application, the essential safety performance of Buck circuit can effectively improve.
Description
Technical field
This application involves intrinsicallysafecircuit technical field, in particular to a kind of essential safety Buck circuit.
Background technique
Applied to the intrinsicallysafecircuit of explosive gas atmosphere, by GB3836.4-2000 standard is defined as: in this standard
Any electric spark or any fuel factor generated under rated condition (including working normally and defined fault condition) cannot point
The circuit of explosive gas atmosphere as defined in firing, specific manifestation are as follows: on IEC (International Electrotechnical Commission) spark test apparatus
The detection test of rated condition is carried out, lighting in the case of three kinds of short circuit, open circuit and ground connection occurs in any one of circuit
Defined explosive gas.
Buck safety circuit is a kind of circuit being widely used in explosive gas atmosphere, but due to existing Buck
There are two kinds of primary elements of capacitor and inductance in circuit, can lead to inductance because of storage because open circuit occurs for circuit where inductance
Energy production electric arc can also lead to capacitor because storage energy generates electric arc, these result in existing because of capacitance short-circuit
The essential safety performance of Buck circuit is lower.
At least there are the following problems in the prior art: existing Buck circuit, open circuit can occur because of circuit where inductance,
Lead to inductance because storage energy generates electric arc, also capacitor can be caused because of storage energy generates electric arc because of capacitance short-circuit, this
The essential safety performance for resulting in existing Buck circuit a bit is lower.
Summary of the invention
The purpose of the embodiment of the present application is to provide a kind of essential safety Buck circuit, to improve the essential safety of Buck circuit
Performance.
The embodiment of the present application provides a kind of essential safety Buck circuit and is achieved in that
A kind of essential safety Buck circuit, comprising:
Buck circuit, including power supply, the first MOSFET pipe, diode, inductance, capacitor, resistance；
Inductance bypass branch；
Switch unit, including the 2nd MOSFET pipe, the 3rd MOSFET pipe, the 2nd MOSFET pipe are connected on inductance bypass
Branch, the 3rd MOSFET pipe are connected with the capacitor；
Driving unit, including input terminal are detected, the input terminal is used to detect the open circuit or short circuit of the Buck circuit, also
Including output end, the output end is used to control the on or off of the MOSFET pipe.
In preferred embodiment, the detection driving unit includes:
First input end, including two contacts, respectively with the first end of the inductance, the first end and the diode
Node between cathode is electrically connected；
Second input terminal, including two contacts, respectively with the second end of the inductance, the second end and described second
Node between the drain electrode of MOSFET pipe is electrically connected；
Third input terminal, including two contacts, two leafs with branch where the resistance are electrically connected respectively；
4th input terminal, including two contacts, are electrically connected the top crown in the capacitor and the third
The both ends of current-limiting resistance between MOSFET pipe；
First output end is electrically connected with the grid of the first MOSFET pipe, for controlling the first MOSFET pipe
On or off；
Second output terminal is electrically connected with the grid of the 2nd MOSFET pipe, for controlling the 2nd MOSFET pipe
On or off；
Third output end is electrically connected with the grid of the 3rd MOSFET pipe, for controlling the 3rd MOSFET pipe
On or off.
In preferred embodiment, when open circuit occurs between two contacts of the first input end, the first input end
It detects that voltage increases between described two contacts, drives first output end to control the first MOSFET pipe cut-off, make
Power outage；
The third output end controls the 3rd MOSFET pipe cut-off, the second output terminal control described second
The conducting of MOSFET pipe, the inductance and the diode, the 2nd MOSFET pipe form continuous current circuit, make depositing for the inductance
Energy storage capacity dissipates.
In preferred embodiment, when open circuit occurs between two contacts of second input terminal, second input terminal
It detects that voltage increases between described two contacts, drives first output end to control the first MOSFET pipe cut-off, make
Power outage；
The third output end controls the 3rd MOSFET pipe cut-off, the second output terminal control described second
The conducting of MOSFET pipe, the inductance and the diode, the 2nd MOSFET pipe form continuous current circuit, make depositing for the inductance
Energy storage capacity dissipates.
In preferred embodiment, when short circuit occurs for the capacitive branch both ends, capacitive branch electric current rapid increase, described the
Four input terminals detect that the voltage at the current-limiting resistance both ends rises, while the third input terminal detects described two contacts
Between voltage decline, drive the third output end to control the 3rd MOSFET pipe cut-off, drive the first output end control
The first MOSFET pipe cut-off is made, makes power outage, so that arc energy is passive and terminates.
Using a kind of essential safety Buck circuit provided by the embodiments of the present application, can by the detection driving unit,
Real-time detection is to the open circuit or capacitance short-circuit situation in the Buck circuit, by the output end of the detection driving unit,
Control the on and off of the MOSFET pipe.In this manner it is possible to effectively make to generate by capacitance short-circuit or inductance open circuit
Storage energy dissipates, and avoids the generation of electric arc, to effectively improve the essential safety performance of the Buck circuit, obtains a kind of
The Buck circuit of matter safety.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the electrical block diagram of Buck circuit；
Fig. 2 is a kind of electrical block diagram for essential safety Buck circuit that the application one embodiment provides；
Fig. 3 is a kind of electrical block diagram for detection driving unit that the application one embodiment provides.
Specific embodiment
The embodiment of the present application provides a kind of essential safety Buck circuit.
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without creative efforts
Range.
Fig. 2 is the method flow diagram of herein described one kind.Although this application provides as the following examples or attached drawing institute
The circuit structure shown, but based on routine or may include more or less in the circuit without creative labor
Modular unit.There is no in necessary causal structure in logicality, these circuit structures are not limited to the embodiment of the present application
Or circuit structure shown in the drawings.
Specifically as described in Figure 2, a kind of a kind of embodiment of essential safety Buck circuit provided by the present application may include:
Buck circuit, including power supply E, the first MOSFET pipe M1, diode D, inductance L, capacitor C, resistance R1；
Inductance bypass branch；
Switch unit, including the 2nd MOSFET pipe M2, the 3rd MOSFET pipe M3, the 2nd MOSFET pipe M2 are connected on electricity
Feel bypass branch, the 3rd MOSFET pipe M3 connects with the capacitor；
Driving unit, including input terminal are detected, the input terminal is used to detect the open circuit or short circuit of the Buck circuit, also
Including output end, the output end is used to control the on or off of MOSFET pipe.
The circuit structure diagram of the Buck circuit is as shown in Figure 1.In general, as shown in Figure 1, the Buck circuit can wrap
Include power supply E, MOSFET pipe M, diode D, inductance L, capacitor C, resistance R.
As shown in Fig. 2, the detection driving unit may include:
First input end J1, including two contacts A1 and A2, respectively with the first end of the inductance L, the first end with
Node between the diode D cathode is electrically connected；
Second input terminal J2, including two contacts A3 and A4, respectively with the second end of the inductance L, the second end with
Node between the 2nd MOSFET pipe M2 drain electrode is electrically connected；
Third input terminal J3, including two contacts A5 and A6, it is electric with two leafs of branch where the resistance R1 respectively
Property connection；
4th input terminal J4, including two contacts A7 and A8 are electrically connected in the top crown of the capacitor C and described
The both ends of current-limiting resistance R2 between 3rd MOSFET pipe M3；
First output end S1 is electrically connected, for controlling described first with the grid of the first MOSFET pipe M1
The on or off of MOSFET pipe M1；
Second output terminal S2 is electrically connected, for controlling described second with the grid of the 2nd MOSFET pipe M2
The on or off of MOSFET pipe M2；
Third output end S3 is electrically connected, for controlling the third with the grid of the 3rd MOSFET pipe M3
The on or off of MOSFET pipe M3.
Using a kind of embodiment of essential safety Buck circuit provided by the above embodiment, can be driven by the detection
Moving cell, real-time detection to the open circuit or capacitance short-circuit situation in the Buck circuit pass through the detection driving unit
Output end controls the on and off of the MOSFET pipe.In this manner it is possible to effectively make because of capacitance short-circuit or inductance open circuit
The storage energy of generation dissipates, and avoids the generation of electric arc, to effectively improve the essential safety performance of the Buck circuit, obtains
A kind of higher Buck circuit of essential safety performance.
In Fig. 3 the application one embodiment, the electrical block diagram of the detection driving unit, as shown in figure 3, detection
Driving unit may include tetra- input terminals of J1, J2, J3 and J4 and S1, S2 and S3 tri- output for the driving of MOSFET pipe
End.The circuit structure of driving unit is detected, as shown in figure 3, the input signal from J1, J2, J3 and J4, successively puts by differential
It is exported after big device, basic RS filpflop, logical operation circuit and MOSFET tube drive circuit by S1, S2 and S3.When J1 and J2 institute
The circuit of detection any one or two at all occur open circuit generate electric arc when, it is defeated after differential amplifier to collect arc voltage
High level out, high level simultaneously keep, the logic circuit of process or door basic RS filpflop set, trigger output high level,
By the driving circuit of MOSFET to which MOSFET pipe be connected.When capacitance short-circuit occurring generating electric arc, what J3 and J4 were detected
Arc voltage and arc current export high level after differential amplifier, and high level is to basic RS filpflop set, trigger
Output high level is simultaneously kept, and by the logic circuit with door and NOT gate, exports low level, by the driving circuit of MOSFET to
Disconnect MOSFET pipe.When inductance open circuit or capacitance short-circuit occur for circuit, S1 output signal, power cutoff can be opened immediately
It closes.Circuit structure increases isolated power supply DC_DC_3, inputs as power supply E, and output is just VCC_3, and output is born as GND_3, with every
Influence from control circuit to main circuit.
In the application one embodiment, when open circuit occurs between two contacts of the first input end, described first
Input terminal detects that voltage increases between described two contacts, can drive the first output end control described first first
The cut-off of MOSFET pipe, makes power outage；
Then the third output end controls the 3rd MOSFET pipe cut-off, after this, the second output terminal control
The 2nd MOSFET pipe conducting is made, the inductance and the diode, the 2nd MOSFET pipe form continuous current circuit, make institute
The storage energy for stating inductance dissipates.
In another embodiment of the application, when open circuit occurs between two contacts of second input terminal, described the
Two input terminals detect that voltage increases between described two contacts, can drive the first output end control described first first
The cut-off of MOSFET pipe, makes power outage；
Then the third output end controls the 3rd MOSFET pipe cut-off, after this, the second output terminal control
The 2nd MOSFET pipe conducting is made, the inductance and the diode, the 2nd MOSFET pipe form continuous current circuit, make institute
The storage energy for stating inductance dissipates.
Storage using the embodiment of above-mentioned two embodiment offer, in the inductance that can effectively dissipate after open circuit
Energy effectively avoids the generation of electric arc, improves the essential safety performance of the Buck circuit.
In another embodiment of the application, when short circuit occurs for the capacitor, capacitive branch electric current rapid increase, described the
Four input terminals detect that the voltage at the current-limiting resistance both ends rises, while the third input terminal detects described two contacts
Between voltage decline, the third output end can be driven to control the 3rd MOSFET pipe cut-off first, then described in driving
First output end controls the first MOSFET pipe cut-off, makes power outage, so that arc energy is passive and terminates.
It, can be after short circuit occurs for branch both ends where capacitor, quickly using embodiment provided by the above embodiment
It disconnects the switch and power switch being connected in series to the capacitor and improves the Buck circuit so that the energy of electric arc is terminated because passive
Essential safety performance.
Using a kind of embodiment for essential safety Buck circuit that the various embodiments described above provide, the detection can be passed through
Driving unit, real-time detection pass through the detection driving unit to open circuit or capacitance short-circuit situation in the Buck circuit
Output end, control the on and off of the MOSFET pipe.In this manner it is possible to effectively make because capacitance short-circuit or inductance are disconnected
The storage energy that road generates dissipates, and avoids the generation of electric arc, to effectively improve the essential safety performance of the Buck circuit, obtains
To a kind of Buck circuit of essential safety.
Although depicting the application by embodiment, it will be appreciated by the skilled addressee that the application there are many deformation and
Variation is without departing from spirit herein, it is desirable to which the attached claims include these deformations and change without departing from the application's
Spirit.
Claims (4)
1. a kind of essential safety Buck circuit characterized by comprising
Buck circuit, including power supply, the first MOSFET pipe, diode, inductance, capacitor, resistance；
Inductance bypass branch；
Switch unit, including the 2nd MOSFET pipe, the 3rd MOSFET pipe, the 2nd MOSFET pipe are connected on inductance bypass branch
Road, the 3rd MOSFET pipe are connected with the capacitor；
Driving unit, including input terminal are detected, the input terminal is used to detect the open circuit or short circuit of the Buck circuit, further includes
Output end, the output end are used to control the on or off of the first, second, third MOSFET pipe；
Wherein, the input terminal includes:
First input end, including two contacts, respectively with the first end of the inductance, the first end and the diode cathode
Between node be electrically connected；
Second input terminal, including two contacts, respectively with the second end of the inductance, the second end and the 2nd MOSFET
Node between pipe drain electrode is electrically connected；
Third input terminal, including two contacts, two leafs with branch where the resistance are electrically connected respectively；
4th input terminal, including two contacts are electrically connected in the top crown of the capacitor and the 3rd MOSFET pipe
Between current-limiting resistance both ends；
The output end includes:
First output end is electrically connected, for controlling leading for the first MOSFET pipe with the grid of the first MOSFET pipe
Logical or cut-off；
Second output terminal is electrically connected, for controlling leading for the 2nd MOSFET pipe with the grid of the 2nd MOSFET pipe
Logical or cut-off；
Third output end is electrically connected, for controlling leading for the 3rd MOSFET pipe with the grid of the 3rd MOSFET pipe
Logical or cut-off.
2. a kind of essential safety Buck circuit as described in claim 1, which is characterized in that when two of the first input end
When open circuit occurring between contact, the first input end detects that voltage increases between described two contacts, driving described first
Output end controls the first MOSFET pipe cut-off, makes power outage；
The third output end controls the 3rd MOSFET pipe cut-off, and the second output terminal controls the 2nd MOSFET pipe
Conducting, the inductance and the diode, the 2nd MOSFET pipe form continuous current circuit, consume the storage energy of the inductance
It dissipates.
3. a kind of essential safety Buck circuit as described in claim 1, which is characterized in that when two of second input terminal
When open circuit occurring between contact, second input terminal detects that voltage increases between described two contacts, driving described first
Output end controls the first MOSFET pipe cut-off, makes power outage；
The third output end controls the 3rd MOSFET pipe cut-off, and the second output terminal controls the 2nd MOSFET pipe
Conducting, the inductance and the diode, the 2nd MOSFET pipe form continuous current circuit, consume the storage energy of the inductance
It dissipates.
4. a kind of essential safety Buck circuit as described in claim 1, which is characterized in that when the capacitive branch both ends occur
When short-circuit, capacitive branch electric current rapid increase, the 4th input terminal detects that the voltage at the current-limiting resistance both ends rises, together
Shi Suoshu third input terminal detects that voltage declines between described two contacts, drives the third output end to control the third
The cut-off of MOSFET pipe drives first output end to control the first MOSFET pipe cut-off, makes power outage, so that electric
Arc energy is terminated because passive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710255704.7A CN106998135B (en) | 2017-04-19 | 2017-04-19 | A kind of essential safety Buck circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710255704.7A CN106998135B (en) | 2017-04-19 | 2017-04-19 | A kind of essential safety Buck circuit |
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| Publication Number | Publication Date |
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| CN106998135A CN106998135A (en) | 2017-08-01 |
| CN106998135B true CN106998135B (en) | 2019-03-05 |
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| CN201710255704.7A Active CN106998135B (en) | 2017-04-19 | 2017-04-19 | A kind of essential safety Buck circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110190746B (en) * | 2019-05-21 | 2021-07-30 | 中国矿业大学 | Intrinsically safe type interleaved parallel Boost converter for mine detection robot |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203553965U (en) * | 2013-06-14 | 2014-04-16 | 上海申传电气股份有限公司 | Mining explosive-proof and intrinsically safe battery charger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201008141Y (en) * | 2007-02-02 | 2008-01-16 | 白世忠 | Two wire terminal intelligent power supply switch |
| CN102082430A (en) * | 2011-01-27 | 2011-06-01 | 广州金升阳科技有限公司 | Surge suppression circuit |
| GB2517400A (en) * | 2013-06-24 | 2015-02-25 | Cordex Instr Ltd | Apparatus and method |
| CN103887787B (en) * | 2014-01-29 | 2016-08-17 | 北方工业大学 | Arc extinguishing method of intrinsically safe inductive circuit |
| CN104300517B (en) * | 2014-05-05 | 2018-07-17 | 西南交通大学 | A kind of unidirectional variable-pressure high voltage DC breaker based on improved One Buck-Boost converter body |
| CN106383545B (en) * | 2016-12-05 | 2017-10-13 | 北方工业大学 | Spark discharge constant-power arc extinguishing method of intrinsically safe Buck circuit |
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- 2017-04-19 CN CN201710255704.7A patent/CN106998135B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203553965U (en) * | 2013-06-14 | 2014-04-16 | 上海申传电气股份有限公司 | Mining explosive-proof and intrinsically safe battery charger |
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