CN209104797U - Mine power resource guard grating quick closedown circuit - Google Patents
Mine power resource guard grating quick closedown circuit Download PDFInfo
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- CN209104797U CN209104797U CN201822184533.6U CN201822184533U CN209104797U CN 209104797 U CN209104797 U CN 209104797U CN 201822184533 U CN201822184533 U CN 201822184533U CN 209104797 U CN209104797 U CN 209104797U
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Abstract
The utility model discloses a kind of mine power resource guard grating quick closedown circuits, including current sampling resistor R0, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R10, detection amplification operational amplifier IC1, short-circuit detecting triode Q8, diode D1, voltage-stabiliser tube D2, field-effect tube Q0, start-up circuit, this circuit is fixed using voltage-stabiliser tube D2, is limited field-effect tube Q0 gate-source turn-on voltage Vgs, so that it is not entered the full conjunction state of depth, inhibits the Miller effect.With depth is full close conduction mode compared with, field-effect tube exits on state delay time and is reduced to original half the time, improves field-effect tube response speed, the quick closedown guard grating when output voltage terminal shorted to earth.
Description
Technical field
The utility model relates to a kind of mine power resource guard grating quick closedown circuits, belong to mining equipment technical field.
Background technique
In inflammable and explosive environment, if largely using electrical equipment, electric spark, the electrostatic of various frictions in production process
Spark, high temperature etc. are inevitable, especially when device fails, are likely to that explosion environment can be lighted.Essential safety is to be
It unites explosion-proof technology, the control room equipment of harbor is connected by guard grating with the intrinsic safety equipment of hazardous area, transmitting signal
Or energy.Guard grating utilizes current limliting and pressure limiting circuit, limits the energy that hazardous area is transmitted to from harbor；In danger
The intrinsic safety equipment in place can work normally under such energy, but such energy is not enough to the explosion environment that ignites, even if
Intrinsic safety equipment itself fail will not generate any electric spark or heating surface for being enough to ignite.Therefore, either safe
The control room equipment in place or the intrinsic safety device fails of hazardous area, as long as the normal work of current limiting pressure-limiting circuit of guard grating
Make, whole system all can be in a safe condition, will not generate explosion.
Guard grating connects between intrinsicallysafecircuit and immaterial safety circuit, by supply intrinsicallysafecircuit voltage or
Current limit is in certain safe range.The major function of guard grating is current limiting pressure-limiting, and limitation enters the energy at scene.Mining electricity
The safe gate technique in source is widely adopted in mine supervision equipment, it is therefore an objective to prevent danger energy from entering dangerous scene, to ensure
The person and equipment safety.The quick closedown of guard grating, for improving the safety of mining equipment, reliability is of great significance and
Practical value.
There are many framework schemes for guard grating, commonly use field-effect tube MOS circuit to complete.Fet gate (pole G) exists
Miller capacitance Cgs.Cause the Miller effect, the Miller effect leads to the reduction of field-effect tube high frequency response, prevents metal-oxide-semiconductor field effect transistor from fast
Speed conducting, cut-off.To prevent guard grating from quick closedown, safety, the reliability of mining equipment are influenced.
If the Miller effect can be inhibited, field-effect tube response speed, quick closedown guard grating, to raising mining equipment are improved
Safety has a very important significance.
Utility model content
The purpose of this utility model is to provide a kind of mine power resource guard grating quick closedown circuits, utilize zener diode
The voltage value of fet gate rationally, fixed is given, so that it is not entered the full conjunction state of depth, inhibits the Miller effect, improve field
Effect pipe response speed, the quick closedown guard grating when output voltage terminal shorted to earth.
The purpose of this utility model is achieved by the following technical programs:
A kind of mine power resource guard grating quick closedown circuit, including current sampling resistor R0, resistance R1, resistance R2, resistance
R3, resistance R4, resistance R5, resistance R6, resistance R10, detection amplification operational amplifier IC1, short-circuit detecting triode Q8, diode
One end of D1, voltage-stabiliser tube D2, field-effect tube Q0, start-up circuit 1, the current sampling resistor R0 is connected with voltage input end, electricity
The other end of stream sample resistance R0 is connected with the source electrode of field-effect tube Q0, and one end of the resistance R3 is connected with voltage input end,
The other end of resistance R3 is grounded through resistance R5, and one end of the resistance R4 is connected with the source electrode of field-effect tube Q0, and resistance R4's is another
One end is grounded through resistance R6, it is described detection amplification operational amplifier IC1 normal phase input end be connected to resistance R3, resistance R5 it
Between, the inverting input terminal of the detection amplification operational amplifier IC1 is connected between resistance R4, resistance R6, and the resistance R2 connects
It is connected between the source electrode and grid of field-effect tube Q0, the anode of the voltage-stabiliser tube D2 is connected to the grid of field-effect tube Q0, pressure stabilizing
The cathode of pipe D2 is connected to the source electrode of field-effect tube Q0, and the anode of the diode D1 and detection amplify operational amplifier IC1's
The cathode of output end, the diode D1 is connected with the grid of field-effect tube Q0, one end of the resistance R1 and field-effect tube Q0
Grid be connected, the other end of resistance R1 is connect with the collector of short-circuit detecting triode Q8, short-circuit detecting triode Q8 emit
Pole ground connection, one end of resistance R10 are connected with short-circuit detecting triode Q8 base stage, and the other end of resistance R10 is with field-effect tube Q0's
Drain electrode is connected, and one end of the start-up circuit 1 is connected with voltage input end, and the other end of start-up circuit 1 is with field-effect tube Q0's
Drain electrode is connected, and the drain electrode of field-effect tube Q0 is connected with voltage output end.
Compared with prior art, the utility model has the beneficial effects that conduction mode is closed using the non-depth of field-effect tube is full,
With depth is full close conduction mode compared with, field-effect tube exits on state delay time and is reduced to original half the time, improves
Field-effect tube response speed, when output voltage terminal shorted to earth quick closedown guard grating.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model embodiment 1；
Fig. 2 is the circuit diagram of the utility model embodiment 2.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, mine power resource guard grating quick closedown circuit, including current sampling resistor R0, resistance R1, resistance
R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R10, detection amplification operational amplifier IC1, short-circuit detecting triode
Q8, diode D1, voltage-stabiliser tube D2, field-effect tube Q0, start-up circuit 1, field-effect tube Q0 are P-channel field-effect transistor (PEFT) pipe.The electric current
One end of sample resistance R0 is connected with voltage input end, the source electrode phase of the other end and field-effect tube Q0 of current sampling resistor R0
Even, one end of the resistance R3 is connected with voltage input end, and the other end of resistance R3 is grounded through resistance R5, and the one of the resistance R4
End is connected with the source electrode of field-effect tube Q0, and the other end of resistance R4 is grounded through resistance R6, and operational amplifier IC1 is amplified in the detection
Normal phase input end be connected between resistance R3, resistance R5, it is described detection amplification operational amplifier IC1 inverting input terminal connection
Between resistance R4, resistance R6, the resistance R2 is connected between the source electrode and grid of field-effect tube Q0, the voltage-stabiliser tube D2's
Anode is connected to the grid of field-effect tube Q0, and the cathode of voltage-stabiliser tube D2 is connected to the source electrode of field-effect tube Q0, the diode D1
Anode and detection amplification operational amplifier IC1 output end, the grid phase of the cathode and field-effect tube Q0 of the diode D1
Even, one end of the resistance R1 is connected with the grid of field-effect tube Q0, and the other end of resistance R1 is with short-circuit detecting triode Q8's
Collector connection, short-circuit detecting triode Q8 emitter ground connection, one end and the short-circuit detecting triode Q8 base stage phase of resistance R10
Even, the other end of resistance R10 is connected with the drain electrode of field-effect tube Q0, and one end of the start-up circuit 1 is connected with voltage input end,
The other end of start-up circuit 1 is connected with the drain electrode of field-effect tube Q0, and the drain electrode of field-effect tube Q0 is connected with voltage output end.Starting
The effect of circuit 1: when guard grating input voltage, because field-effect tube is in close state, so without output voltage.It needs artificial
Input voltage with very little electric current, it is output to output end.After voltage to be output increases, start-up circuit stops working, field-effect tube
It can continue working, export electric current.
When voltage normally exports, detection amplification operational amplifier IC1 amplifier exports low level, can be isolated by diode D1
Effect.Field-effect tube Q0 is connected in triode Q8 conducting.It is limited by voltage-stabiliser tube D2, P hook road field-effect tube Q0 is in non-depth and leads
Logical state.When voltage output termination electrode shorted to earth moment, sample resistance both end voltage rises, and makes detection amplification operational amplifier
IC1 overturning output high level simultaneously constitutes feedback with field-effect tube Q0, limits, stabilizes output electric current.
This circuit voltage-stabiliser tube D2 is fixed, is limited field-effect tube Q0 gate-source turn-on voltage Vgs, it is made not enter depth
Full conjunction state, inhibits the Miller effect.But the value of the pressure stabilizing value of voltage-stabiliser tube D2 is to inhibiting the Miller effect most important, if taking D2
For the voltage-stabiliser tube of 12V, when output end instantaneous short circuit over the ground, shutdown moment exists because of Miller capacitance effect, field-effect tube G pole tension
About 100nS is stopped on Miller step, output voltage is caused to be delayed to 150nS cutting, and effect is not obvious.
The formula that the utility model provides the best value of zener diode is as follows:
Voltage-stabiliser tube D2 pressure stabilizing value=(Vgs*12%)+Vgs (th)
Wherein, the value of Vgs (th) and Vgs can be checked in by field-effect tube parameter handbook.
Such as: certain field-effect tube parameter: Vgs=20V, Vgs (th)=3V.Then voltage-stabiliser tube D2 pressure stabilizing value=(20*12%)+
3=5.4V；
It looks into zener diode parameter list to learn, nominal 5.6V zener diode can be selected, pressure stabilizing diodes in parallel is existed
Between fet gate-source electrode.When field-effect tube conducting, the pole field-effect tube G-S pole tension is limited in 5.6V, then field-effect
Pipe enters non-depth on state.Non- depth saturation field-effect tube can quickly exit on state, and output voltage U0 is made to exist
Zero is dropped in 70nS.More than 1/2 are reduced than the time before improving, effect is most significant.
Field-effect tube closing velocity has a direct impact output energy, and rear terminal shortcircuit, guard grating should stop defeated immediately
Out.Postpone the smaller the better, it is minimum to make to export energy, does not generate spark and avoids igniting dangerous substance.
It is the circuit diagram of the utility model embodiment 2 as shown in Figure 2.Wherein field-effect tube is N-channel field-effect tube.
In addition to the implementation, the utility model can also have other embodiments, all to use equivalent replacement or equivalent change
The technical solution to be formed is changed, is all fallen in the protection scope of the requires of the utility model.
Claims (1)
1. a kind of mine power resource guard grating quick closedown circuit, which is characterized in that including current sampling resistor R0, resistance R1, electricity
Hinder R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R10, detection amplification operational amplifier IC1, short-circuit detecting triode
Q8, diode D1, voltage-stabiliser tube D2, field-effect tube Q0, start-up circuit, one end of the current sampling resistor R0 and voltage input end
It is connected, the other end of current sampling resistor R0 is connected with the source electrode of field-effect tube Q0, one end of the resistance R3 and voltage input
End is connected, and the other end of resistance R3 is grounded through resistance R5, and one end of the resistance R4 is connected with the source electrode of field-effect tube Q0, resistance
The other end of R4 is grounded through resistance R6, and the normal phase input end of the detection amplification operational amplifier IC1 is connected to resistance R3, resistance
Between R5, the inverting input terminal of the detection amplification operational amplifier IC1 is connected between resistance R4, resistance R6, the resistance
R2 is connected between the source electrode and grid of field-effect tube Q0, and the anode of the voltage-stabiliser tube D2 is connected to the grid of field-effect tube Q0,
The cathode of voltage-stabiliser tube D2 is connected to the source electrode of field-effect tube Q0, the anode and detection amplification operational amplifier of the diode D1
The cathode of the output end of IC1, the diode D1 is connected with the grid of field-effect tube Q0, one end of the resistance R1 and field-effect
The grid of pipe Q0 is connected, and the other end of resistance R1 is connect with the collector of short-circuit detecting triode Q8, short-circuit detecting triode Q8
Emitter ground connection, one end of resistance R10 are connected with short-circuit detecting triode Q8 base stage, the other end and field-effect tube of resistance R10
The drain electrode of Q0 is connected, and one end of the start-up circuit is connected with voltage input end, the other end and field-effect tube Q0 of start-up circuit
Drain electrode be connected, the drain electrode of field-effect tube Q0 is connected with voltage output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822184533.6U CN209104797U (en) | 2018-12-25 | 2018-12-25 | Mine power resource guard grating quick closedown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822184533.6U CN209104797U (en) | 2018-12-25 | 2018-12-25 | Mine power resource guard grating quick closedown circuit |
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| Publication Number | Publication Date |
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| CN209104797U true CN209104797U (en) | 2019-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822184533.6U Active CN209104797U (en) | 2018-12-25 | 2018-12-25 | Mine power resource guard grating quick closedown circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449905A (en) * | 2018-12-25 | 2019-03-08 | 镇江中煤电子有限公司 | Mine power resource guard grating quick closedown circuit |
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2018
- 2018-12-25 CN CN201822184533.6U patent/CN209104797U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449905A (en) * | 2018-12-25 | 2019-03-08 | 镇江中煤电子有限公司 | Mine power resource guard grating quick closedown circuit |
| CN109449905B (en) * | 2018-12-25 | 2024-04-05 | 镇江中煤电子有限公司 | Quick closing circuit for safety grid of mining power supply |
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