CN106324419A - Grounding fault detecting circuit - Google Patents
Grounding fault detecting circuit Download PDFInfo
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- CN106324419A CN106324419A CN201610708076.9A CN201610708076A CN106324419A CN 106324419 A CN106324419 A CN 106324419A CN 201610708076 A CN201610708076 A CN 201610708076A CN 106324419 A CN106324419 A CN 106324419A
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- resistance
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- transporting discharging
- integrated transporting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a grounding fault detecting circuit which comprises the components of a three-phase vector input circuit, a first-stage adder circuit, a first window comparing circuit, a second window comparing circuit and a detecting-and-alarming processing circuit. The three-phase vector input circuit is connected with the first-grade adder circuit. The first-grade adder circuit is connected with the first window comparing circuit and the second window comparing circuit. The first window comparing circuit and the second window comparing circuit are connected with the detecting-and-alarming processing circuit. The detecting-and-alarming processing circuit is internally provided with a resistor R14, a resistor R15, a diode D3, a diode D4, a diode D5 and a capacitor C2. The second end of the resistor R14 is connected with the cathode of the diode D13 and is furthermore connected with the first end of the capacitor C2, the first end of the resistor R15, the anode of the diode D4 and the cathode of the diode D5, thereby realizing a hardware structure which is designed for detecting and analyzing the fault. The grounding fault detecting circuit has advantages of simple operation, high sensitivity in use, etc.
Description
Technical field
The present invention relates to detect processing technology field, specifically, be a kind of ground fault detection circuit.
Background technology
Power system by generating electricity, the electrical energy production that forms of power transformation, transmission of electricity, the link such as distribution and electricity consumption and consumption system.It
Function be that the primary energy of nature (is mainly included that boiler, steam turbine, electromotor and power plant are auxiliary by generation power device
Help production system etc.) change into electric energy, then supply power to each load center through defeated, transformer substation system and distribution system, pass through
Various equipment reconverts become the energy of the multi-forms such as power, heat, light, for regional economy and people's lives service.Due to power supply
Point and load center majority are in different regions, also cannot mass storage, therefore it produces, carries, distributes and consumes all same
Completing in time, and organically form a whole in same region, electrical energy production must keep and equilibrium consumption in the moment.Cause
This, the concentration exploitation of electric energy uses with dispersion, and the change at random of the without interruption and load of electric energy, just constrains power train
The structure of system and operation.Accordingly, power system to realize its function, just need to arrange corresponding letter at links and different levels
Breath and control system, in order to the production to electric energy measures with transport process, regulates, controls, protects, communicates and dispatches, really
Warranty family obtains safety, economy, the electric energy of high-quality.
The appearance of power system, uses efficient, pollution-free, easy to use, easily controllable electric energy to be used widely, pushes away
Move the change of social production every field, started the electric power epoch, there occurs the second technical revolution.The scale of power system
With one of technology height mark having become a national economic development level.
Fault ground (fault earthing) is also called earth fault, instructs body to be connected with the accident of the earth.Electric line
Set overcurrent protection doubles as earth-fault protection；Utilize zero-sequence current to be grounded error protection；Utilize residue electricity
Stream is grounded error protection.
When earth fault occurs, there is following several earth fault:
(1) when there is a phase (such as A phase) partial earth, i.e. by high resistance or arcing ground, at this moment fault phase
Voltage reduces, and the voltage of healthy phases raises, and they are more than phase voltage, but do not reach line voltage.Voltage transformer open delta
The voltage at place reaches setting valve, voltage relay action, sends ground signalling.
(2) if it occur that certain phase dead ground, then the voltage of fault phase drops to zero, and the voltage of healthy phases is increased to line electricity
Pressure.100V voltage, voltage relay action now occur at voltage transformer open delta, sends ground signalling.
(3) there is a phase (A phase) broken string or fuse member fusing in voltage transformer high-pressure side, and the now instruction of fault phase is not
Zero, this is owing to this phase voltage table forms series loop through mutual inductor coil and other biphase voltmeters in secondary circuit, goes out
Existing smaller voltage instruction, but be not this phase virtual voltage, healthy phases is still phase voltage.Can go out at transformer open delta
Existing about 35V magnitude of voltage, and starting relay, send ground signalling.
(4) owing to system existing capacitive and the element of perception parameter, particular with the filter inductor element of iron core,
Parameter combination can cause ferromagnetic resonance, and the actuating of relay when not mating, and sends ground signalling.
(5) unloaded bus virtual ground phenomenon.When bus no-load running, it is also possible to there will be imbalance of three-phase voltage,
And send ground signalling.But grounding phenomenon can be died away after serving a circuit.
Summary of the invention
It is an object of the invention to provide a kind of ground fault detection circuit, for realize carrying out fault detect, analysis and set
The hardware configuration of meter, has simple to operate, uses the characteristics such as sensitive.
The present invention is achieved through the following technical solutions: a kind of ground fault detection circuit, including three phasor1 input circuits,
First order adder circuit, first window comparison circuit, the second window comparator circuit, detection alert process circuit, described three-phase
Vector input circuit is connected with first order adder circuit, first order adder circuit respectively with first window comparison circuit and
Second window comparator circuit is connected, first window comparison circuit and the second window comparator circuit all with detection alert process circuit
It is connected；Detection alert process circuit in be provided with resistance R14, resistance R15, diode D3, diode D4, diode D5 and
First end of electric capacity C2, resistance R14 be connected with the positive pole of diode D3 and with first window comparison circuit and the second window ratio
The outfan of relatively circuit is connected, second end of resistance R14 be connected with the negative pole of diode D13 and respectively with the of electric capacity C2
One end, first end of resistance R15, the positive pole of diode D4 are connected with the negative pole of diode D5, second end of electric capacity C2 and two
The positive pole of pole pipe D5 is connected and ground connection, and second end of described resistance R15 is connected with the warning circuit of rear class；Described diode
The negative pole of D4 is connected to+5V power supply.
The most to better implement the present invention, the following structure that arranges is used especially: described first order adder circuit
Inside being provided with integrated transporting discharging U1, resistance R4, resistance R5, resistance R6 and electric capacity C1, resistance R4, resistance R5 and electric capacity C1 are the most also
Joining, and after parallel connection connects end altogether and is connected with 9 feet of integrated transporting discharging U1, another after parallel connection connects end altogether by resistance R6
Being connected with the second window comparator circuit, 10 feet of integrated transporting discharging U1 pass through resistance R6 ground connection, 8 feet of integrated transporting discharging U1 and first
Window comparator circuit is connected.
The most to better implement the present invention, the following structure that arranges is used especially: more electric at described first window
Resistance R10, resistance R11, resistance R12, resistance R13, diode D2 and integrated transporting discharging U2, described integrated transporting discharging U1 it is provided with in road
8 feet be connected with 8 feet of integrated transporting discharging U2, first end of resistance R11 is connected with second end of resistance R12, resistance R12's
First end is connected with first end of resistance R13, second end of resistance R13 respectively with the negative pole of diode D2, the of resistance R14
14 feet of one end and integrated transporting discharging U2 are connected, and the positive pole of diode D2 is connected with second end of resistance R11, integrated transporting discharging U2
9 feet by resistance R10 ground connection.
The most to better implement the present invention, the following structure that arranges is used especially: first foot of described resistance R12 is also
It is connected with+15V DC source.
The most to better implement the present invention, the following structure that arranges is used especially: more electric at described second window
Be provided with integrated transporting discharging U3, resistance R7, resistance R8, resistance R9 and diode D1 in road, 11 feet of integrated transporting discharging U3 respectively with electricity
First end of resistance R6 and resistance R9 is connected, and second end of resistance R9 is connected with the positive pole of diode D1, and diode D1's is negative
Pole is connected with first end of resistance R14 and 13 feet of integrated transporting discharging U3 respectively；10 feet of integrated transporting discharging U3 are connect by resistance R8
Ground, and 10 feet of integrated transporting discharging U3 are also by the negative power supply of resistance R7 access.
The most to better implement the present invention, the following structure that arranges is used especially: described negative power supply is-15V
DC source.
The most to better implement the present invention, the following structure that arranges is used especially: the negative pole of described diode D4 is also
+ 5V power supply is had to be connected.
The most to better implement the present invention, the following structure that arranges is used especially: described three phasor1 input circuits
Be connected with 9 feet of integrated transporting discharging U1, and be provided with in three phasor1 input circuits in the resistance R1 being connected in parallel, resistance R2 and
Resistance R3.
The most to better implement the present invention, the following structure that arranges is used especially: described integrated transporting discharging U2 and U3 adopts
With with a piece of integrated transporting discharging chip, and the chip model of integrated transporting discharging U2 and integrated transporting discharging U3 is LM339.
The most to better implement the present invention, the following structure that arranges is used especially: described integrated transporting discharging U1 uses
LF347。
The present invention compared with prior art, has the following advantages and beneficial effect:
The present invention be realize carrying out fault detect, hardware configuration that analysis designs, have simple to operate, use sensitive etc.
Characteristic.
The present invention uses integrated transporting discharging to build adder circuit, is used for carrying out the judgement of fault-signal, then according to judgement
Result is delivered to the warning circuit of rear class, in order to reach the purpose reported to the police.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1:
A kind of ground fault detection circuit, for realizing carrying out fault detect, analysis and the hardware configuration that designs, has operation
Simply, use the characteristics such as sensitive, as it is shown in figure 1, be specifically arranged to following structure: include three phasor1 input circuits, the first order
Adder circuit, first window comparison circuit, the second window comparator circuit, detection alert process circuit, described three phasor1s are defeated
Enter circuit to be connected with first order adder circuit, first order adder circuit respectively with first window comparison circuit and the second window
Mouth comparison circuit is connected, and first window comparison circuit and the second window comparator circuit are all connected with detection alert process circuit
Connect；It is provided with resistance R14, resistance R15, diode D3, diode D4, diode D5 and electric capacity in detection alert process circuit
First end of C2, resistance R14 is connected with the positive pole of diode D3 and compares electric with first window comparison circuit and the second window
The outfan on road is connected, second end of resistance R14 be connected with the negative pole of diode D13 and respectively with the first of electric capacity C2
End, first end of resistance R15, the positive pole of diode D4 are connected with the negative pole of diode D5, second end of electric capacity C2 and two poles
The positive pole of pipe D5 is connected and ground connection, and second end of described resistance R15 is connected with the warning circuit of rear class.
Embodiment 2:
The present embodiment is to optimize further on the basis of above-described embodiment, the most to better implement the present invention,
As it is shown in figure 1, use especially the following structure that arranges: be provided with in the described first order adder circuit integrated transporting discharging U1, resistance R4,
Resistance R5, resistance R6 and electric capacity C1, resistance R4, resistance R5 and electric capacity C1 are parallel with one another, and after parallel connection connects end and collection altogether
Become amplifier U1 9 feet be connected, after parallel connection another altogether connect end be connected by resistance R6 and the second window comparator circuit, collect
Becoming 10 feet of amplifier U1 by resistance R6 ground connection, 8 feet of integrated transporting discharging U1 are connected with first window comparison circuit.
Embodiment 3:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: be provided with resistance R10, resistance in described first window comparison circuit
R11, resistance R12, resistance R13, diode D2 and integrated transporting discharging U2,8 feet of described integrated transporting discharging U1 and 8 feet of integrated transporting discharging U2
Being connected, first end of resistance R11 is connected with second end of resistance R12, first end of resistance R12 and the first of resistance R13
End is connected, second end of resistance R13 respectively with the negative pole of diode D2, first end of resistance R14 and the 14 of integrated transporting discharging U2
Foot is connected, and the positive pole of diode D2 is connected with second end of resistance R11, and 9 feet of integrated transporting discharging U2 are connect by resistance R10
Ground.
Embodiment 4:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: first foot of described resistance R12 is also connected with+15V DC source.
Embodiment 5:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: be provided with integrated transporting discharging U3, electricity in described second window comparator circuit
Resistance R7,11 feet first end with resistance R6 and resistance R9 respectively of resistance R8, resistance R9 and diode D1, integrated transporting discharging U3 are connected
Connecing, second end of resistance R9 is connected with the positive pole of diode D1, the negative pole of diode D1 respectively with first end of resistance R14 and
13 feet of integrated transporting discharging U3 are connected；10 feet of integrated transporting discharging U3 pass through resistance R8 ground connection, and 10 feet of integrated transporting discharging U3 are the most logical
Cross resistance R7 and access negative power supply.
Embodiment 6:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: described negative power supply is-15V DC source.
Embodiment 7:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: the negative pole of described diode D4 also has+5V power supply to be connected.
Embodiment 8:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: described three phasor1 input circuits are connected with 9 feet of integrated transporting discharging U1
Connect, and be provided with in the resistance R1 being connected in parallel, resistance R2 and resistance R3 in three phasor1 input circuits.
Embodiment 9:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: described integrated transporting discharging U2 and U3 uses with a piece of integrated transporting discharging chip, and
The chip model of integrated transporting discharging U2 and integrated transporting discharging U3 is LM339.
LM339 voltage comparator chip internal is equipped with four independent voltage comparators, and LM339 is the most common integrated electricity
Road.Utilize lm339 can form various voltage comparator circuit and pierce circuit easily.
Equipped with four independent voltage comparators inside LM339 integrated package, the feature of this voltage comparator is: 1) imbalance electricity
Pressing little, representative value is 2mV；2) supply voltage wide ranges, single supply is 2-36V, and dual-supply voltage is ± 1V-± 18V；3) contrast
The internal resistance of relatively signal source limits wider；4) common mode range is very big, is 0～(Ucc-1.5V) Vo；5) differential input voltage range is relatively
Greatly, big to being equal to supply voltage；6) outfan current potential can be selected flexibly and easily.
LM339 pin configuration is shown in Table 1:
Table 1
| Pin | Symbol | Function |
| 1 | OUTPUT2 | Outfan 2 |
| 2 | OUTPUT1 | Outfan 1 |
| 3 | V+ | Power supply is just |
| 4 | INPUT1- | Inverting input 1 |
| 5 | INPUT1+ | In-phase input end 1 |
| 6 | INPUT2- | Inverting input 2 |
| 7 | INPUT2+ | In-phase input end 2 |
| 8 | INPUT3- | Inverting input 3 |
| 9 | INPUT3+ | In-phase input end 3 |
| 10 | INPUT4- | Inverting input 4 |
| 11 | INPUT4+ | In-phase input end 4 |
| 12 | GND | Power supply ground |
| 13 | OUTPUT4 | Outfan 4 |
| 14 | OUTPUT3 | Outfan 3 |
Embodiment 10:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably to realize this
Bright, as it is shown in figure 1, use the following structure that arranges especially: described integrated transporting discharging U1 uses LF347.
LF347 pin configuration is shown in Table 2:
Table 2
| Pin | Symbol | Function |
| 1 | OUTPUT1 | Outfan 1 |
| 2 | INPUT1- | Reverse input end 1 |
| 3 | INPUT1+ | In-phase input end 1 |
| 4 | VCC+ | Power supply is just |
| 5 | INPUT2+ | In-phase input end 2 |
| 6 | INPUT2- | Inverting input 2 |
| 7 | OUTPUT2 | Outfan 2 |
| 8 | OUTPUT3 | Outfan 3 |
| 9 | INPUT3- | Inverting input 3 |
| 10 | INPUT3+ | In-phase input end 3 |
| 11 | VCC- | Power supply is born |
| 12 | INPUT4+ | In-phase input end 4 |
| 13 | INTPUT4- | Reverse input end 4 |
| 14 | OUTPUT4 | Outfan 4 |
In the present invention, all resistance and electric capacity all use surface mount elements；The first order adder circuit of the present invention is a use
In the adder circuit of summation, output three-phase electricity flow valuve has vector correlation, and when three-phase balance, its vector is zero,
8 foot output voltages of adder U1 should be close to 0V；When three-phase current unbalance degree increases, through the window electricity that rear class U2, U3 are constituted
Pressure comparator (differentiating positive and negative balance current value), exports grounding alarm signal, and by the warning circuit of rear class.
When applying the present invention, maintenance process is as follows.
(1) present invention being connected with converter, after converter powers on, display is normal.Zero load, puts into enabling signal, runs
The most normal；Converter band carry after, jumper connection earth fault in start-up course and shut down.Now synchronous monitoring to 14 feet of U2 become-
15V-determines that creating ground signalling exports.
(2) IU, IV, IW signal of current transformer output inputs through three phasor1 input circuits, monitoring current transformer
Output IU, IV, IW signal, be all 0.25V, illustrate 3 current transformer output signals to, fault is at U1, U2, U3 etc.
Circuit.
(3) because of R2 rosin joint, make the vector of three-phase current be not zero, operation produces ground signalling output, makes converter
Protection is shut down.
The above, be only presently preferred embodiments of the present invention, and the present invention not does any pro forma restriction, every depends on
Any simple modification of being made above example according to the technical spirit of the present invention, equivalent variations, each fall within the protection of the present invention
Within the scope of.
Claims (10)
1. a ground fault detection circuit, it is characterised in that: include three phasor1 input circuits, first order adder circuit,
First window comparison circuit, the second window comparator circuit, detection alert process circuit, described three phasor1 input circuits and first
Level adder circuit be connected, first order adder circuit respectively with first window comparison circuit and the second window comparator circuit phase
Connecting, first window comparison circuit and the second window comparator circuit are all connected with detection alert process circuit；Report to the police in detection
It is provided with resistance R14, resistance R15, diode D3, diode D4, diode D5 and electric capacity C2 in processing circuit, resistance R14's
First end be connected with the positive pole of diode D3 and with the outfan phase of first window comparison circuit and the second window comparator circuit
Connect, second end of resistance R14 be connected with the negative pole of diode D13 and respectively with first end of electric capacity C2, the of resistance R15
One end, the positive pole of diode D4 are connected with the negative pole of diode D5, and second end of electric capacity C2 is connected with the positive pole of diode D5
Connecing and ground connection, second end of described resistance R15 is connected with the warning circuit of rear class.
A kind of ground fault detection circuit the most according to claim 1, it is characterised in that: described first order adder circuit
Inside being provided with integrated transporting discharging U1, resistance R4, resistance R5, resistance R6 and electric capacity C1, resistance R4, resistance R5 and electric capacity C1 are the most also
Joining, and after parallel connection connects end altogether and is connected with 9 feet of integrated transporting discharging U1, another after parallel connection connects end altogether by resistance R6
Being connected with the second window comparator circuit, 10 feet of integrated transporting discharging U1 pass through resistance R6 ground connection, 8 feet of integrated transporting discharging U1 and first
Window comparator circuit is connected.
A kind of ground fault detection circuit the most according to claim 2, it is characterised in that: more electric at described first window
Resistance R10, resistance R11, resistance R12, resistance R13, diode D2 and integrated transporting discharging U2, described integrated transporting discharging U1 it is provided with in road
8 feet be connected with 8 feet of integrated transporting discharging U2, first end of resistance R11 is connected with second end of resistance R12, resistance R12's
First end is connected with first end of resistance R13, second end of resistance R13 respectively with the negative pole of diode D2, the of resistance R14
14 feet of one end and integrated transporting discharging U2 are connected, and the positive pole of diode D2 is connected with second end of resistance R11, integrated transporting discharging U2
9 feet by resistance R10 ground connection.
A kind of ground fault detection circuit the most according to claim 3, it is characterised in that: first foot of described resistance R12
Also it is connected with+15V DC source.
A kind of ground fault detection circuit the most according to claim 4, it is characterised in that: more electric at described second window
Be provided with integrated transporting discharging U3, resistance R7, resistance R8, resistance R9 and diode D1 in road, 11 feet of integrated transporting discharging U3 respectively with electricity
First end of resistance R6 and resistance R9 is connected, and second end of resistance R9 is connected with the positive pole of diode D1, and diode D1's is negative
Pole is connected with first end of resistance R14 and 13 feet of integrated transporting discharging U3 respectively；10 feet of integrated transporting discharging U3 are connect by resistance R8
Ground, and 10 feet of integrated transporting discharging U3 are also by the negative power supply of resistance R7 access.
A kind of ground fault detection circuit the most according to claim 5, it is characterised in that: described negative power supply is-15V
DC source.
7. according to a kind of ground fault detection circuit described in any one of claim 3-6, it is characterised in that: described diode D4
Negative pole also have+5V power supply be connected.
8. according to a kind of ground fault detection circuit described in any one of claim 2-6, it is characterised in that: described three phasor1s
Input circuit is connected with 9 feet of integrated transporting discharging U1, and be provided with in three phasor1 input circuits in the resistance R1 being connected in parallel,
Resistance R2 and resistance R3.
9. according to a kind of ground fault detection circuit described in claim 5 or 6, it is characterised in that: described integrated transporting discharging U2 and
U3 uses with a piece of integrated transporting discharging chip, and the chip model of integrated transporting discharging U2 and integrated transporting discharging U3 is LM339.
10. according to a kind of ground fault detection circuit described in any one of claim 2-6, it is characterised in that: described integrated fortune
Put U1 and use LF347.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708076.9A CN106324419A (en) | 2016-08-23 | 2016-08-23 | Grounding fault detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708076.9A CN106324419A (en) | 2016-08-23 | 2016-08-23 | Grounding fault detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106324419A true CN106324419A (en) | 2017-01-11 |
Family
ID=57741794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610708076.9A Pending CN106324419A (en) | 2016-08-23 | 2016-08-23 | Grounding fault detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106324419A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196184A (en) * | 2018-01-25 | 2018-06-22 | 昆明理工大学 | A kind of XL series boost chip detection device and method |
| CN108879614A (en) * | 2018-08-23 | 2018-11-23 | 深圳市默贝克驱动技术有限公司 | Frequency converter output earth short circuit protects circuit |
| CN111060841A (en) * | 2019-12-10 | 2020-04-24 | 中船航海科技有限责任公司 | Phase failure alarm device for gyrocompass |
-
2016
- 2016-08-23 CN CN201610708076.9A patent/CN106324419A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196184A (en) * | 2018-01-25 | 2018-06-22 | 昆明理工大学 | A kind of XL series boost chip detection device and method |
| CN108196184B (en) * | 2018-01-25 | 2023-06-20 | 昆明理工大学 | XL series boost chip detection device and method |
| CN108879614A (en) * | 2018-08-23 | 2018-11-23 | 深圳市默贝克驱动技术有限公司 | Frequency converter output earth short circuit protects circuit |
| CN111060841A (en) * | 2019-12-10 | 2020-04-24 | 中船航海科技有限责任公司 | Phase failure alarm device for gyrocompass |
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