CN106207948A - There is the logger circuit protection device of warning function - Google Patents
There is the logger circuit protection device of warning function Download PDFInfo
- Publication number
- CN106207948A CN106207948A CN201610589387.8A CN201610589387A CN106207948A CN 106207948 A CN106207948 A CN 106207948A CN 201610589387 A CN201610589387 A CN 201610589387A CN 106207948 A CN106207948 A CN 106207948A
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- CN
- China
- Prior art keywords
- current
- mos switch
- logger
- switch module
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of logger circuit protection device with warning function, including circuit board and alarm, circuit board is provided with current detection module, single-chip microcomputer and MOS switch module；Single-chip microcomputer is connected with alarm, current detection module and MOS switch module respectively.By the overcurrent protective device of the present invention; oil well logging instrument is during downhole drill; when system operating current increases suddenly, it is possible to disconnecting circuit in time, protect oil well logging instrument; when electric current recovers normal; single-chip microcomputer can recover conducting by automatic control relay again, makes circuit normal power supply, it is not necessary to artificially change electric fuse; while saving manpower and materials cost, drastically increase oil well logging efficiency.It addition, the present invention was detecting that stream number of times controlled described MOS switch module and keeps cut-off when reaching predetermined value, and send alarm signal to described alarm, improve further the safety of circuit.
Description
Technical field
The present invention relates to petroleum exploration well logging field, particularly relate to the logger circuit protection dress with warning function
Put.
Background technology
Petroleum industry well logging during LWD (Logging While Drilling) generally refers to measure during drilling well
Formation rock physical parameter, and with data telemetry system, measurement result is delivered to ground in real time and process.Due to current data
The restriction of transmission technology, substantial amounts of data are stored in the memorizer of downhole instrument, play back after trip-out.Measurement while drilling MWD
(Measurement While Drilling) generally refers to drilling engineering parameter and measures, such as hole deviation, orientation and tool-face etc.
Measure.Sometimes, MWD refers to all of underground survey during drilling well.
The formation parameter obtained due to well logging during is just to bore the formation parameter opened, and it is closest to the initial condition on stratum,
For more favourable than general wireline logging to oil-containing, the gas evaluation of bad ground.Connector for logging while drilling is placed in drill collar, except measuring
Outside the conventional loggings such as resistivity, the velocity of sound, neutron porosity, density and some imaging logging, also measure the pressure of the drill, moment of torsion, rotating speed, ring
Pneumatics power, temperature, the drilling parameter such as chemical composition.Bad environments in drill bit drilling process, temperature is the highest, and pressure is very big, vibration
Strongly, downhole temperature often reaches more than 150 DEG C, and therefore, the requirement to the high temperature resistant property of downhole petroleum logger is higher.
Common downhole petroleum logger includes: magnetic compass list, multishot instrument, steering tool, nothing
Line directional tool, EMI, photograph list, multiple spot gyrolevel, electronic gyroscope inclinometer etc..
Oil well logging instrument is during downhole drill, if running into harder rock or circuit appearance short circuit feelings
Condition, system operating current can increase suddenly, can burn out electronic circuit, affect construction speed time serious.At present conventional method be
System power supply end seals in an electric fuse, and if there is over-current phenomenon avoidance, electric fuse fuses automatically, protects electronic circuit.But this
Kind of electric fuse is only capable of protecting once, has blown and has needed to change, and when changing electric fuse, needs to interrupt construction, and by whole string instrument from
Well head is brought up, and wastes time and energy.The operating temperature range of the most most of resettable fuses is between-40 DEG C to 85 at present
DEG C, also cannot meet and be actually needed.
Summary of the invention
In order to solve above-mentioned technical problem, it is provided that one can be more than or equal to 150 DEG C of work in high temperature environments, possess
Stream protection and the device automatically recovered, the invention provides a kind of logger circuit protection device with warning function, bag
Include circuit board and alarm, described circuit board is provided with current detection module, single-chip microcomputer and MOS switch module, described electric current
Detection module is connected with the power supply interface of downhole petroleum logger, for measuring the power supply interface of downhole petroleum logger
Output electric current；
Described MOS switch module is connected in the power supply output circuit of downhole petroleum logger；
Described single-chip microcomputer is connected with described alarm, current detection module and MOS switch module respectively, and described single-chip microcomputer is used
In receiving the current information that current detection module is measured；
Described single-chip microcomputer controls described MOS switch module when described electric current is more than the overloading threshold preset to be ended, and
Control the conducting of described MOS switch module after the scheduled time, again receive the current information that current detection module is measured, and judge again
The electric current of secondary reception whether less than described overloading threshold, the most then controls the conducting of described MOS switch module, if it is not, then control institute
State the cut-off of MOS switch module；Described single-chip microcomputer is further used for the number of times recording described electric current more than the overloading threshold preset, and
Control described MOS switch module when described number of times reaches predetermined value and keep cut-off, and send alarm signal to described alarm.
Further, also include shell and cover plate, in described shell, offer the groove for accommodating described circuit board, institute
State circuit board to be arranged in described groove.
Further, also include that the first joint and the second joint, described first joint and the second joint are separately positioned on institute
State the two ends of shell, and described first joint and the second joint are all connected with described circuit board.
Further, also include that collar, described collar are arranged on outside described second joint, described collar and described shell
It is flexibly connected.
Further, described current detection module includes the current detecting chip for detecting size of current.
Further, described current detection module also includes current amplifier, and described current amplifier is for measuring well
The output electric current of the power supply interface of lower oil well logging instrument is amplified.
Further, described shell is cylindrical.
Further, described first joint is three needle adapters, and described second joint is ten needle adapters, and described second joint
It is connected with described collar.
Further, when the operating current of described downhole petroleum logger is 1A-1.5A, described overloading threshold is 3A.
Further, when the operating current of described downhole petroleum logger is 200mA-1A, described overloading threshold is 2A.
Assembly of the invention is provided with alarm, current detection module, single-chip microcomputer and MOS switch module, is examined by electric current
Survey the output electric current that module measures the power supply interface of downhole petroleum logger, receive current detection module by single-chip microcomputer and measure
Current information, and control the cut-off of described MOS switch module when described electric current is more than the overloading threshold preset, and in pre-timing
Control the conducting of described MOS switch module after between, again receive the current information that current detection module is measured, and judge again to receive
Electric current whether less than described overloading threshold, the most then control the conducting of described MOS switch module, if it is not, then control described MOS
Switch module ends.Foregoing circuit functional module can work (more than or equal to 150 DEG C) in high temperature environments and possess overcurrent protection
And auto restore facility.It addition, described single-chip microcomputer is further used for the number of times recording described electric current more than the overloading threshold preset,
And control the holding cut-off of described MOS switch module when described number of times reaches predetermined value, and send alarm signal to described alarm
Number.The present invention was detecting that stream number of times controlled described MOS switch module and keeps cut-off, and to described warning when reaching predetermined value
Device sends alarm signal, improves the safety of circuit further.
It addition, the present invention is also provided with shell and two interfaces, circuit board is arranged in the enclosure, makes the stability of device
Higher, versatility is more preferable, is convenient for changing.
By the overcurrent protective device of the present invention, oil well logging instrument is during downhole drill, at system operating current
When increasing suddenly, it is possible to disconnecting circuit in time, protecting oil well logging instrument, when electric current recovers normal, single-chip microcomputer again can be automatic
Control MOS switch module recovery conducting, make circuit normal power supply, it is not necessary to artificially change electric fuse, save manpower and materials
While Ben, drastically increase oil well logging efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art and advantage, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the decomposing schematic representation of the logger circuit protection device with warning function that the present invention provides；
Fig. 2 is the structured flowchart of the circuit board of the present invention.
In figure: 1-shell, 2-the first joint, 3-the second joint, 4-circuit board, 41-current detection module, 42-single-chip microcomputer,
43-MOS switch module, 44-current detecting chip, 45-current amplifier, 5-cover plate, 6-collar, 7-groove, 8-downhole petroleum
Logger, 81-power supply interface, 9-alarm.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of not making creative work all its
His embodiment, broadly falls into the scope of protection of the invention.
Embodiment one:
Refer to Fig. 1, Fig. 2, the invention provides a kind of logger circuit protection device with warning function, including
Circuit board 4 and alarm 9, described circuit board is provided with current detection module 41, single-chip microcomputer 42 and MOS switch module 43, institute
State current detection module 41 to be connected with the power supply interface 81 of downhole petroleum logger 8, be used for measuring downhole petroleum logger 8
The output electric current of power supply interface 81；
Described MOS switch module 43 is connected in the power supply output circuit of downhole petroleum logger 8；
Described single-chip microcomputer 42 is connected with described alarm 9, current detection module 41 and MOS switch module 43 respectively, described
Single-chip microcomputer 42 is for receiving the current information that current detection module 41 is measured；
Described single-chip microcomputer 42 controls described MOS switch module 43 when described electric current is more than the overloading threshold preset to be ended,
And after the scheduled time, control described MOS switch module 43 turn on, again receive the current information that current detection module 41 is measured,
And judge that the electric current again received whether less than described overloading threshold, the most then controls described MOS switch module 43 and turns on, if
No, then control described MOS switch module 43 and end；Described single-chip microcomputer 42 is further used for recording described electric current more than the mistake preset
Carry the number of times of threshold value, and control the holding cut-off of described MOS switch module 43 when described number of times reaches predetermined value, and to described report
Alert device 9 sends alarm signal.
Further, also include shell 1 and cover plate 5, offer in described shell 1 for accommodating the recessed of described circuit board 4
Groove 7, described circuit board 4 is arranged in described groove 7.
Further, also include that the first joint 2 and the second joint 3, described first joint 2 and the second joint 3 are respectively provided with
At the two ends of described shell 1, and described first joint 2 and the second joint 3 are all connected with described circuit board 4.
Further, also including that collar 6, described collar 6 are arranged on outside described second joint 3, described collar 6 is with described
Shell 1 is flexibly connected.
Further, described current detection module 41 includes the current detecting chip 44 for detecting size of current.
Further, described current detection module 41 also includes current amplifier 45, and described current amplifier 45 is for right
The output electric current of the power supply interface 81 measuring downhole petroleum logger 8 is amplified.
Further, described shell 1 is cylindrical.
Further, described first joint 2 is three needle adapters, and described second joint 3 is ten needle adapters, and described second connects
3 are connected with described collar 6.Certainly, in concrete application scenarios, the first different joints can be set according to physical circuit
Stitch number with the second joint.
Further, when the operating current of described downhole petroleum logger 8 is 1A-1.5A, described overloading threshold is 3A.
Assembly of the invention is provided with alarm, current detection module, single-chip microcomputer and MOS switch module, is examined by electric current
Survey the output electric current that module measures the power supply interface of downhole petroleum logger, receive current detection module by single-chip microcomputer and measure
Current information, and control the cut-off of described MOS switch module when described electric current is more than the overloading threshold preset, and in pre-timing
Control the conducting of described MOS switch module after between, again receive the current information that current detection module is measured, and judge again to receive
Electric current whether less than described overloading threshold, the most then control the conducting of described MOS switch module, if it is not, then control described MOS
Switch module ends.Foregoing circuit functional module can work (more than or equal to 150 DEG C) in high temperature environments and possess overcurrent protection
And auto restore facility.It addition, described single-chip microcomputer is further used for the number of times recording described electric current more than the overloading threshold preset,
And control the holding cut-off of described MOS switch module when described number of times reaches predetermined value, and send alarm signal to described alarm
Number.The present invention was detecting that stream number of times controlled described MOS switch module and keeps cut-off, and to described warning when reaching predetermined value
Device sends alarm signal, improves the safety of circuit further.
It addition, the present invention is also provided with shell and two interfaces, circuit board is arranged in the enclosure, makes the stability of device
Higher, versatility is more preferable, is convenient for changing.
By the overcurrent protective device of the present invention, oil well logging instrument is during downhole drill, at system operating current
When increasing suddenly, it is possible to disconnecting circuit in time, protecting oil well logging instrument, when electric current recovers normal, single-chip microcomputer again can be automatic
Control MOS switch module recovery conducting, make circuit normal power supply, it is not necessary to artificially change electric fuse, save manpower and materials
While Ben, drastically increase oil well logging efficiency.
Embodiment two:
Refer to Fig. 1, Fig. 2, the invention provides a kind of logger circuit protection device with warning function, including
Circuit board 4 and alarm 9, described circuit board is provided with current detection module 41, single-chip microcomputer 42 and MOS switch module 43, institute
State current detection module 41 to be connected with the power supply interface 81 of downhole petroleum logger 8, be used for measuring downhole petroleum logger 8
The output electric current of power supply interface 81；
Described MOS switch module 43 is connected in the power supply output circuit of downhole petroleum logger 8；
Described single-chip microcomputer 42 is connected with described alarm 9, current detection module 41 and MOS switch module 43 respectively, described
Single-chip microcomputer 42 is for receiving the current information that current detection module 41 is measured；
Described single-chip microcomputer 42 controls described MOS switch module 43 when described electric current is more than the overloading threshold preset to be ended,
And after the scheduled time, control described MOS switch module 43 turn on, again receive the current information that current detection module 41 is measured,
And judge that the electric current again received whether less than described overloading threshold, the most then controls described MOS switch module 43 and turns on, if
No, then control described MOS switch module 43 and end；Described single-chip microcomputer 42 is further used for recording described electric current more than the mistake preset
Carry the number of times of threshold value, and control the holding cut-off of described MOS switch module 43 when described number of times reaches predetermined value, and to described report
Alert device 9 sends alarm signal.
It should be noted that, in the application scenarios that the present invention is concrete, described single-chip microcomputer 42 calculates institute by enumerator
State the electric current number of times more than the overloading threshold preset, it is also possible to be referred to as the frequency of failure.If at described electric current more than the overload preset
When the number of times of threshold value is not up to predetermined value, when the electric current detected is less than overloading threshold, then single-chip microcomputer 42 is controlling MOS switch mould
When block 43 turns on, counter O reset, restarts counting when the upper electric current once received reaches described overloading threshold.
In concrete application scenarios, alarm 9 can be voice guard, by sending audible alarm.
Further, also include shell 1 and cover plate 5, offer in described shell 1 for accommodating the recessed of described circuit board 4
Groove 7, described circuit board 4 is arranged in described groove 7.
Further, also include that the first joint 2 and the second joint 3, described first joint 2 and the second joint 3 are respectively provided with
At the two ends of described shell 1, and described first joint 2 and the second joint 3 are all connected with described circuit board 4.
Further, also including that collar 6, described collar 6 are arranged on outside described second joint 3, described collar 6 is with described
Shell 1 is flexibly connected.
Further, described current detection module 41 includes the current detecting chip 44 for detecting size of current.
Further, described current detection module 41 also includes current amplifier 45, and described current amplifier 45 is for right
The output electric current of the power supply interface 81 measuring downhole petroleum logger 8 is amplified.
Further, described shell 1 is cylindrical.
Further, described first joint 2 is three needle adapters, and described second joint 3 is ten needle adapters, and described second connects
3 are connected with described collar 6.
Further, when the operating current of described downhole petroleum logger 8 is 200mA-1A, described overloading threshold is
2A。
Assembly of the invention is provided with alarm, current detection module, single-chip microcomputer and MOS switch module, is examined by electric current
Survey the output electric current that module measures the power supply interface of downhole petroleum logger, receive current detection module by single-chip microcomputer and measure
Current information, and control the cut-off of described MOS switch module when described electric current is more than the overloading threshold preset, and in pre-timing
Control the conducting of described MOS switch module after between, again receive the current information that current detection module is measured, and judge again to receive
Electric current whether less than described overloading threshold, the most then control the conducting of described MOS switch module, if it is not, then control described MOS
Switch module ends.Foregoing circuit functional module can work (more than or equal to 150 DEG C) in high temperature environments and possess overcurrent protection
And auto restore facility.It addition, described single-chip microcomputer is further used for the number of times recording described electric current more than the overloading threshold preset,
And control the holding cut-off of described MOS switch module when described number of times reaches predetermined value, and send alarm signal to described alarm
Number.The present invention was detecting that stream number of times controlled described MOS switch module and keeps cut-off, and to described warning when reaching predetermined value
Device sends alarm signal, improves the safety of circuit further.
It addition, the present invention is also provided with shell and two interfaces, circuit board is arranged in the enclosure, makes the stability of device
Higher, versatility is more preferable, is convenient for changing.
By the overcurrent protective device of the present invention, oil well logging instrument is during downhole drill, at system operating current
When increasing suddenly, it is possible to disconnecting circuit in time, protecting oil well logging instrument, when electric current recovers normal, single-chip microcomputer again can be automatic
Control MOS switch module recovery conducting, make circuit normal power supply, it is not necessary to artificially change electric fuse, save manpower and materials
While Ben, drastically increase oil well logging efficiency.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. there is the logger circuit protection device of warning function, it is characterised in that include circuit board (4) and alarm (9),
Being provided with current detection module (41), single-chip microcomputer (42) and MOS switch module (43) on described circuit board (4), described electric current is examined
Survey module (41) to be connected with the power supply interface (81) of downhole petroleum logger (8), be used for measuring downhole petroleum logger (8)
The output electric current of power supply interface (81)；
Described MOS switch module (43) is connected in the power supply output circuit of downhole petroleum logger (8)；
Described single-chip microcomputer (42) is connected with described alarm (9), current detection module (41) and MOS switch module (43) respectively,
Described single-chip microcomputer (42) is used for receiving the current information that current detection module (41) is measured；
Described single-chip microcomputer (42) controls the cut-off of described MOS switch module (43) when described electric current is more than the overloading threshold preset,
And after the scheduled time, control the conducting of described MOS switch module (43), again receive the electric current that current detection module (41) is measured
Information, and judge that the electric current again received whether less than described overloading threshold, the most then controls described MOS switch module (43)
Conducting, if it is not, then control the cut-off of described MOS switch module (43)；Described single-chip microcomputer (42) is further used for recording described electric current
More than the number of times of the overloading threshold preset, and control the holding of described MOS switch module (43) when described number of times reaches predetermined value
Cut-off, and send alarm signal to described alarm (9).
The logger circuit protection device with warning function the most according to claim 1, it is characterised in that also include
Shell (1) and cover plate (5), offer the groove (7) for accommodating described circuit board (4), described circuit board in described shell (1)
(4) it is arranged in described groove (7).
The logger circuit protection device with warning function the most according to claim 2, it is characterised in that also include
First joint (2) and the second joint (3), described first joint (2) and the second joint (3) are separately positioned on described shell (1)
Two ends, and described first joint (2) and the second joint (3) be all connected with described circuit board (4).
The logger circuit protection device with warning function the most according to claim 3, it is characterised in that also include
Collar (6), described collar (6) is arranged on described second joint (3) outside, and described collar (6) is movable with described shell (1) even
Connect.
The logger circuit protection device with warning function the most according to claim 3, it is characterised in that described electricity
Stream detection module (41) includes the current detecting chip (44) for detecting size of current.
The logger circuit protection device with warning function the most according to claim 5, it is characterised in that described electricity
Stream detection module (41) also includes current amplifier (45), and described current amplifier (45) is for measuring downhole petroleum logging instrument
The output electric current of the power supply interface (81) of device (8) is amplified.
The logger circuit protection device with warning function the most according to claim 2, it is characterised in that outside described
Shell (1) is cylindrical.
The logger circuit protection device with warning function the most according to claim 4, it is characterised in that described
One joint (2) is three needle adapters, and described second joint (3) is ten needle adapters, and described second joint (3) and described collar (6)
Connect.
The logger circuit protection device with warning function the most according to claim 1, it is characterised in that described well
When the operating current of lower oil well logging instrument (8) is 1A-1.5A, described overloading threshold is 3A.
The logger circuit protection device with warning function the most according to claim 1, it is characterised in that described
When the operating current of downhole petroleum logger (8) is 200mA-1A, described overloading threshold is 2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610589387.8A CN106207948A (en) | 2016-07-25 | 2016-07-25 | There is the logger circuit protection device of warning function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610589387.8A CN106207948A (en) | 2016-07-25 | 2016-07-25 | There is the logger circuit protection device of warning function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106207948A true CN106207948A (en) | 2016-12-07 |
Family
ID=57494824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610589387.8A Pending CN106207948A (en) | 2016-07-25 | 2016-07-25 | There is the logger circuit protection device of warning function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106207948A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114030359A (en) * | 2021-08-11 | 2022-02-11 | 神华准格尔能源有限责任公司 | Intelligent contactor and mining dump truck comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181155A (en) * | 1990-08-30 | 1993-01-19 | Beg Mirza A | Overcurrent trip circuit |
| CN101350512A (en) * | 2007-07-19 | 2009-01-21 | 佛山普立华科技有限公司 | Over current protective system |
| CN203097866U (en) * | 2013-02-01 | 2013-07-31 | 天津领航电气制造有限公司 | Sealing outer shell for oil well downhole detecting device |
| CN203225506U (en) * | 2013-04-02 | 2013-10-02 | 重庆徐港电子有限公司 | A program controlled over-current protection circuit with a settable threshold |
| CN104548354A (en) * | 2015-01-14 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Defibrillation charging overcurrent protection device of defibrillator monitor and defibrillator monitor |
-
2016
- 2016-07-25 CN CN201610589387.8A patent/CN106207948A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181155A (en) * | 1990-08-30 | 1993-01-19 | Beg Mirza A | Overcurrent trip circuit |
| CN101350512A (en) * | 2007-07-19 | 2009-01-21 | 佛山普立华科技有限公司 | Over current protective system |
| CN203097866U (en) * | 2013-02-01 | 2013-07-31 | 天津领航电气制造有限公司 | Sealing outer shell for oil well downhole detecting device |
| CN203225506U (en) * | 2013-04-02 | 2013-10-02 | 重庆徐港电子有限公司 | A program controlled over-current protection circuit with a settable threshold |
| CN104548354A (en) * | 2015-01-14 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Defibrillation charging overcurrent protection device of defibrillator monitor and defibrillator monitor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114030359A (en) * | 2021-08-11 | 2022-02-11 | 神华准格尔能源有限责任公司 | Intelligent contactor and mining dump truck comprising same |
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Application publication date: 20161207 |