CN206321736U - Grounded inspection circuit - Google Patents
Grounded inspection circuit Download PDFInfo
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- CN206321736U CN206321736U CN201621242433.9U CN201621242433U CN206321736U CN 206321736 U CN206321736 U CN 206321736U CN 201621242433 U CN201621242433 U CN 201621242433U CN 206321736 U CN206321736 U CN 206321736U
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Abstract
The application provides a kind of grounded inspection circuit, grounded inspection circuit includes chopper circuit, intermediate dc loop and the inverter circuit being connected in parallel, and voltage sensor and process chip, intermediate dc loop includes the offset divider resistance detection circuit being connected in parallel and electric capacity；Offset divider resistance detection circuit includes first resistor, second resistance and the 3rd resistor being sequentially connected in series, when not occurring earth fault, the voltage at 3rd resistor two ends is about 1/3rd of the voltage in intermediate dc loop, upon the occurrence of a ground fault, the voltage at 3rd resistor two ends will change, voltage sensor reads the voltage at 3rd resistor two ends and is sent to process chip, by voltage of the process chip according to 3rd resistor two ends, it is determined that occurring the position of earth fault.In the circuit, earthing detection is carried out to main circuit using offset electric resistance partial pressure grounded inspection circuit simple in construction, while reduction circuit complexity, circuit maintenance difficulty is reduced.
Description
Technical field
The invention relates to earthing detection technology, more particularly to a kind of grounded inspection circuit.
Background technology
Locomotive may cause partial circuit in main circuit due to reasons such as cable aging, vibration frictions in the process of moving
Or earth fault occurs for whole circuits, can cause to burn phenomenon during locomotive operation when serious.To avoid occurring this kind of situation,
Grounded inspection circuit is set on locomotive, for when the part of earth fault occurs in detecting main circuit, entering to faulty component
Row isolation, so as to be protected to main circuit.
Under normal circumstances, grounded inspection circuit includes a large amount of components such as relay, resistance, passes through the electricity of one big resistance
Resistance links together grounded inspection circuit with main circuit.Detect that circuit in the presence of control circuit, is examined to main circuit
Survey.
Above-mentioned grounded inspection circuit includes substantial amounts of component, circuit structure complexity, high cost and maintenance difficulties height.
Utility model content
The embodiment of the present application provides a kind of grounded inspection circuit, using offset electric resistance partial pressure earthing detection simple in construction
Circuit carries out earthing detection to main circuit, while reduction circuit complexity, reduces circuit maintenance difficulty.
In a first aspect, the application provides a kind of grounded inspection circuit, including：The chopper circuit that is connected in parallel, intermediate dc
Loop and inverter circuit, and voltage sensor and process chip, wherein,
The intermediate dc loop includes the offset divider resistance detection circuit being connected in parallel and electric capacity；
The offset divider resistance detection circuit includes first resistor, second resistance and the 3rd resistor being sequentially connected in series,
The 3rd resistor is in parallel with the voltage sensor, and the tie point of the 3rd resistor and the second resistance is grounded；
The one end of the voltage sensor away from the tie point is connected with the process chip；
The chopper circuit includes braking resistor, the upper copped wave pipe that is connected in series and lower copped wave pipe, the braking resistor with
The lower copped wave pipe is in parallel, and the upper copped wave pipe is connected with the positive pole in the intermediate dc loop, the lower copped wave pipe with it is described
The negative pole connection in intermediate dc loop；
When not occurring earth fault, the voltage at the 3rd resistor two ends and the difference of reference voltage meet predetermined threshold value,
The reference voltage is 1/3rd of the voltage in the intermediate dc loop.
In a kind of feasible implementation, the resistance of the first resistor, the second resistance and the 3rd resistor
It is identical.
In a kind of feasible implementation, the inverter circuit includes inverter, each phase of the inverter
Bridge arm connect a upper switching tube and a lower switching tube, the upper switching tube and the positive pole company in the intermediate dc loop
Connect, the lower switching tube is connected with the negative pole in the intermediate dc loop.
In a kind of feasible implementation, the process chip is connected by traction control unit and the voltage sensor
Connect.
The grounded inspection circuit that the application is provided, grounded inspection circuit includes chopper circuit, the intermediate dc being connected in parallel
Loop and inverter circuit, and voltage sensor and process chip, intermediate dc loop include the offset point being connected in parallel
Piezoresistance detects circuit and electric capacity；Offset divider resistance detection circuit include be sequentially connected in series first resistor, second resistance and
3rd resistor, 3rd resistor is in parallel with voltage sensor, the tie point ground connection of 3rd resistor and second resistance；Voltage sensor is remote
One end from tie point is connected with process chip；Upper copped wave pipe and lower copped wave that chopper circuit includes braking resistor, is connected in series
Pipe, braking resistor is in parallel with lower copped wave pipe, and upper copped wave pipe is connected with the positive pole in intermediate dc loop, lower copped wave pipe and intermediate dc
The negative pole connection in loop, when not occurring earth fault, the voltage at 3rd resistor two ends is about the three of the voltage in intermediate dc loop
/ mono-, upon the occurrence of a ground fault, the voltage at 3rd resistor two ends will change, and voltage sensor reads 3rd resistor
The voltage at two ends is simultaneously sent to process chip, by voltage of the process chip according to 3rd resistor two ends, it is determined that occurring earth fault
Position.In the circuit, earthing detection is carried out to main circuit using offset electric resistance partial pressure grounded inspection circuit simple in construction,
While reducing circuit complexity, circuit maintenance difficulty is reduced.
Brief description of the drawings
Fig. 1 is the structural representation of the application grounded inspection circuit embodiment one；
Fig. 2 is the flow chart of the application ground detecting method；
Fig. 3 is the structural representation of the application grounded inspection circuit embodiment two.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In accompanying drawing, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, those skilled in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of the application protection.Herein below
For with reference to accompanying drawing and preferred embodiment, to embodiment, structure, feature and its effect according to the application specifically
It is bright.
Term " first ", " second ", " the 3rd " in the description and claims of this application and above-mentioned accompanying drawing, "
The (if present)s such as four " are for distinguishing similar object, without for describing specific order or precedence.It should manage
The data that solution is so used can be exchanged in the appropriate case, so as to embodiments herein described herein for example can with except
Order beyond those for illustrating or describing herein is implemented.In addition, term " comprising " and " having " and theirs is any
Deformation, it is intended that covering is non-exclusive to be included, for example, containing the process of series of steps or unit, method, system, production
Product or equipment are not necessarily limited to those steps clearly listed or unit, but may include not list clearly or for this
A little processes, method, product or the intrinsic other steps of equipment or unit.
At present, the main circuit of grounded inspection circuit and locomotive is linked together by the resistance of one big resistance, ground connection inspection
Slowdown monitoring circuit contains a large amount of components such as relay, resistance, and circuit structure is complicated, later maintenance workload is big.Moreover, by big
The resistance connection grounded inspection circuit and main circuit of resistance, do not separate grounded inspection circuit with main circuit so that earthing detection
, there is great potential safety hazard in the class of insulation reduction of circuit and main circuit；In addition, the electromagnetism of grounded inspection circuit and main circuit
, there is interference in poor compatibility, setting can cause the appearance of misoperation each other.
In view of this, the application proposes a kind of grounded inspection circuit, is grounded using offset electric resistance partial pressure simple in construction
Detect that circuit carries out earthing detection to main circuit, while reduction circuit complexity, reduce circuit maintenance difficulty.Specifically, can
Referring to Fig. 1, Fig. 1 is the structural representation of the application grounded inspection circuit embodiment one.Below, the application is implemented with reference to Fig. 1
The structure and working principle of grounded inspection circuit described in example is described in detail.
First, the structure of grounded inspection circuit.
Fig. 1 is refer to, the grounded inspection circuit 21 that the embodiment of the present application is provided includes：The chopper circuit 1 that is connected in parallel, in
Between DC loop 2 and inverter circuit 3, and voltage sensor 4 and process chip 5, wherein, the intermediate dc loop 2 is wrapped
Include the offset divider resistance detection circuit 21 and electric capacity 22 being connected in parallel；The offset divider resistance detection circuit 21 includes
First resistor, second resistance and the 3rd resistor being sequentially connected in series, the 3rd resistor are in parallel with the voltage sensor 4, described
The tie point of 3rd resistor and the second resistance is grounded；The one end of the voltage sensor 4 away from the tie point with it is described
Process chip 5 is connected；Upper copped wave pipe 11 and lower copped wave pipe 12, institute that the chopper circuit 1 includes braking resistor 13, is connected in series
State braking resistor 13 in parallel with the lower copped wave pipe 12, the upper copped wave pipe 11 is connected with the positive pole in the intermediate dc loop 2,
The lower copped wave pipe 12 is connected with the negative pole in the intermediate dc loop 2；When not occurring earth fault, the 3rd resistor two ends
Voltage and the difference of reference voltage meet default default, the reference voltage is the three of the voltage in the intermediate dc loop 2
/ mono-.
Specifically, in chopper circuit 1, R4 is braking resistor 13, R4 is in parallel with lower copped wave pipe 13, and upper copped wave pipe 11 is cut with
Wave duct 13 is connected, and the one end of upper copped wave pipe 11 away from R4 is connected with the positive pole in intermediate dc loop 2, and lower copped wave pipe 13 is remote above to be cut
One end of wave duct 11 is connected with the negative pole in intermediate dc loop 2.In intermediate dc loop 2, R1, R2 and R3 are respectively offset point
First resistor, second resistance and 3rd resistor in piezoresistance detection circuit 21, R2 and R3 tie point ground connection, R3 are passed with voltage
Sensor 4 is in parallel, and the one end of R1 away from R2 is the positive pole in intermediate dc loop 2, and the one end of R3 away from R2 is intermediate dc loop 2
Negative pole.Inverter circuit 3 includes inverter (not shown) etc., and inverter has tri- phases of U, V, W, each phase pair
A bridge arm is answered, each bridge arm has upper switching tube and lower switching tube, upper switching tube and the intermediate dc loop 2 of each bridge arm
Positive pole is connected, and the lower switching tube of each bridge arm is connected with the negative pole in intermediate dc loop 2.
Secondly, the operation principle of grounded inspection circuit.
Under normal circumstances, when in circuit without occurring earth fault, the voltage that voltage sensor 4 detects R3 two ends is
One constant DC voltage, the amplitude of the DC voltage is about 1/3 or so of the voltage of intermediate dc loop 2.If that is,
Using 1/3rd of the voltage in intermediate dc loop 2 as reference voltage, then the difference of the voltage at R3 two ends and the reference voltage
Meet predetermined threshold value.Ideally, predetermined threshold value is 0, i.e. three points of the voltage at R3 two ends equal to the voltage of intermediate dc loop 2
One of, it is earth-free in the case of R3 two ends be always the 1/3Udc voltage of intermediate dc loop (Udc be) be approximately straight line ripple
Shape.When sending earth fault, the voltage at R3 two ends will change, and the voltage that voltage sensor 4 reads R3 two ends is concurrent
Process chip 5 is given, by voltage of the process chip 5 according to R3 two ends, it is determined that occurring the position of earth fault.
The embodiment of the present application provide grounded inspection circuit, including be connected in parallel chopper circuit, intermediate dc loop with
Inverter circuit, and voltage sensor and process chip, intermediate dc loop include the offset divider resistance being connected in parallel
Detect circuit and electric capacity；Offset divider resistance detection circuit includes the first resistor, second resistance and the 3rd electricity being sequentially connected in series
Resistance, 3rd resistor is in parallel with voltage sensor, the tie point ground connection of 3rd resistor and second resistance；Voltage sensor is away from connection
One end of point is connected with process chip；Upper copped wave pipe and lower copped wave pipe that chopper circuit includes braking resistor, is connected in series, braking
Resistance is in parallel with lower copped wave pipe, and upper copped wave pipe is connected with the positive pole in intermediate dc loop, lower copped wave pipe and intermediate dc loop
Negative pole is connected, and when not occurring earth fault, the voltage at 3rd resistor two ends is about 1/3rd of the voltage in intermediate dc loop,
Upon the occurrence of a ground fault, the voltage at 3rd resistor two ends will change, and voltage sensor reads 3rd resistor two ends
Voltage is simultaneously sent to process chip, by voltage of the process chip according to 3rd resistor two ends, it is determined that occurring the position of earth fault.
In the circuit, earthing detection, reduction electricity are carried out to main circuit using offset electric resistance partial pressure grounded inspection circuit simple in construction
While the complexity of road, circuit maintenance difficulty is reduced.
Optionally, in the embodiment of the application one, the resistance of first resistor, second resistance and 3rd resistor in foregoing circuit
Value is identical.Certainly, first resistor, second resistance can also be different from the resistance of 3rd resistor, and the embodiment of the present application is not intended to limit.
Optionally, in the embodiment of the application one, the process chip passes through traction control unit and the voltage sensor
Device is connected.For example, the signal-processing board in traction control unit (Traction Controll Unit, TCU) passes through connector
It is connected with voltage sensor, signal-processing board sends the voltage signal collected to process chip by backboard.
Below, on the basis of above-mentioned grounded inspection circuit, ground connection inspection is carried out using the grounded inspection circuit to the application
The method of survey is described in detail.Specifically, reference can be made to Fig. 2, Fig. 2 be the application ground detecting method flow chart, including：
101st, the process chip obtains the voltage at the 3rd resistor two ends from the voltage sensor.
102nd, the process chip determines earth fault according to the voltage.
The ground detecting method that the embodiment of the present application is provided, during based on not occurring earth fault, the electricity at 3rd resistor two ends
Pressure is about 1/3rd of the voltage in intermediate dc loop, when breaking down, before the voltage at 3rd resistor two ends changes
Carry, obtain the voltage at 3rd resistor two ends from voltage sensor by process chip, according to the voltage at 3rd resistor two ends, it is determined that
Earth fault.In the detection process, main circuit is entered by using offset electric resistance partial pressure grounded inspection circuit simple in construction
Row earthing detection, while reduction circuit complexity, reduces circuit maintenance difficulty.
In the embodiment of the present application, occurring the situation of earth fault substantially has following several situations：Situation one, intermediate dc are returned
Road earth fault；Situation two, inverter circuit output ground fault；Situation three, chopper circuit output ground fault；Situation four,
Inverter circuit neutrality point failure.Below, above-mentioned ground detecting method is described in detail with a specific embodiment.
Fig. 3 can be specifically participated in, Fig. 3 is the structural representation of the application grounded inspection circuit embodiment two.
Situation one, intermediate dc loop earth fault.
Refer to Fig. 3, intermediate dc loop earth fault has two kinds of possibility, respectively in corresponding diagram 1., 2. 2 points.Its
In, the 1. point ground connection for intermediate dc loop plus earth, the 2. point be connected in the negative pole ground connection in intermediate dc loop.
When 1. point ground connection, R1, R2 are shorted, and the voltage at R3 two ends is become by reference voltage turns to intermediate dc loop
Voltage after voltage, and change is the voltage of an amplitude stability.Therefore, if process chip determines the voltage at 3rd resistor two ends
The voltage in intermediate dc loop is increased to, and remains the voltage in intermediate dc loop, it is determined that the positive pole in intermediate dc loop
Earth fault；
When 2. point ground connection, R3 is shorted, and the voltage at R3 two ends is become by reference voltage turns to 0, and remains 0 state.
Therefore, if process chip determines that the voltage at 3rd resistor two ends is reduced to 0, and 0 state is remained, it is determined that intermediate dc is returned
The negative pole ground connection on road.
By the above method, the earthing detection to middle DC loop is realized.
Situation two, inverter circuit output ground fault.
Refer to Fig. 3, inverter circuit output ground fault has three kinds of possibility, respectively in corresponding diagram 3., 4., 5. 3 points.
Wherein, the 3. point ground connection be that inverter U phases bridge arm ground connection, i.e. U phases main line are grounded, the 4. point be inverter V phases bridge arm ground connection, i.e.,
V phases main line is grounded, the 5. point be that inverter W phases bridge arm ground connection, i.e. W phases main line are grounded.There is electric current in traction electric machine stator winding
By when, stator current will necessarily flow through the bridge arm of inverter corresponding phase.If the bridge arm of the phase has earth fault, work as electricity
Stream is by existing during the upper switching tube of the bridge arm of earth fault, and the motor main line and the positive pole in intermediate dc loop of the phase connect
Logical, R1, R2 are shorted, and the voltage change at R3 two ends is the voltage in intermediate dc loop；When electric current is by having earth fault
During the lower switching tube of bridge arm, the motor main line of the phase is connected with the negative pole in intermediate dc loop, R3 times of short circuit, the electricity at R3 two ends
Pressure is become by reference voltage turns to 0.In addition, when the upper switching tube conducting of the bridge arm of some phase in inverter U, V, W phase, under it
The diode of switching tube will bear backward voltage and turn off, and now, the corresponding phase current of the bridge arm can only pass through upper switching tube；Together
Reason, when the lower switching tube conducting of some bridge arm in inverter U, V, W phase, the diode of switching tube will bear backward voltage thereon
And turn off, now, the corresponding phase current of the bridge arm can only pass through lower switching tube.
The above analysis is understood：The voltage at R3 two ends and the trigger signal that there is the upper switching tube of the bridge arm of earth fault
It is identical with there are the output voltage waveforms of the corresponding phase of the bridge arm of earth fault with identical waveform.Therefore, if processing core
Piece determines that impulse waveform is presented in the waveform of voltage, and the maximum of impulse waveform is the voltage in intermediate dc loop, impulse waveform
Minimum value when being 0, in the bridge arm of three phases of process chip inverter circuit, the triggering letter of the upper switching tube of each bridge arm
Number waveform, so as to obtain the waveform of three trigger signals；Then from the waveform of three trigger signals, first wave is determined
Shape, first waveform is consistent with the waveform of voltage, and the corresponding bridge arm of first waveform is the bridge arm for occurring earth fault.
For example, when process chip is according to voltage sensor, it is found that impulse waveform, and the voltage is presented in the voltage at R3 two ends
Waveform is consistent with the waveform of the trigger signal of the upper switching tube of U phase bridge arms, then it is assumed that when the 3. point occur earth fault；For another example,
When process chip is according to voltage sensor, it is found that impulse waveform, and the voltage waveform and V phase bridge arms is presented in the voltage at R3 two ends
Upper switching tube trigger signal waveform it is consistent, then it is assumed that now the 4. point occur earth fault；And for example, when process chip root
According to voltage sensor, it is found that impulse waveform, and the voltage waveform and the upper switching tube of W phase bridge arms is presented in the voltage at R3 two ends
The waveform of trigger signal is consistent, then it is assumed that when the 5. point occur earth fault.
In the above method, by the upper switching tube for comparing the voltage at 3rd resistor two ends and the bridge arm of each phase of inverter
Trigger signal, realizes the detection to inverter circuit output ground fault.
Situation three, chopper circuit output ground fault.
It refer to Fig. 3, chopper circuit output ground fault is the 6. point ground connection.If the 6. point be grounded, when cutting
When the upper copped wave pipe of wave circuit is opened, R1, R2 are shorted, and the voltage at R3 two ends is become by reference voltage turns to intermediate dc loop electricity
Pressure；If 6. put and be not grounded, when the upper copped wave pipe of chopper circuit is opened, R1 and R2 will not be shorted.Therefore, it is described
Process chip controls the upper copped wave pipe of the chopper circuit open-minded；The process chip determine the voltage whether become turn to it is described
The voltage in intermediate dc loop；If so, then the process chip determines the upper copped wave pipe and lower copped wave pipe of the chopper circuit
Tie point is grounded；Otherwise, it is determined that earth fault does not occur for the chopper circuit.
Specifically, will can carry out continuously opening control in the upper copped wave pipe short time of chopper circuit, using R3 two ends
Voltage is judged.
It should be noted that, although being by gathering whether the voltage at R3 two ends is sent out chopper circuit in above-described embodiment
What raw earth fault was judged.However, the embodiment of the present application is not limited thereto system, in other feasible implementations,
Current sensor can also be set on chopper circuit, and the current sensor is arranged between copped wave pipe and lower copped wave pipe, led to
Over-current sensor gathers electric current, judges according to whether the electric current occurs earth fault to chopper circuit.
In the above method, carry out opening control by the upper switching tube to chopper circuit, to the voltage at 3rd resistor two ends
It is monitored, realizes the detection to chopper circuit output ground fault.
The neutral point failure of situation four, inverter circuit.
It refer to Fig. 3, inverter circuit neutral ground failure is the 7. point ground connection in figure.
Assuming that the voltage in intermediate dc loop is expressed as Udc, the upper switching tube of each bridge arm of inverter, which is opened, is expressed as 1,
Lower switching tube, which is opened, to be expressed as A, B, C in 0, figure and represents U, V, W phase bridge arm respectively, represents that U, V, W switching tube are opened with ABC suitable
Sequence, then the voltage at R3 two ends be likely to occur four kinds of situations as shown in the table：
Table 1
| Sequence number | The voltage at R3 two ends | The state of switching tube |
| 1 | 0 | 000 |
| 2 | Udc | 111 |
| 3 | 2/3Udc | 110,011,101 |
| 4 | 1/3Udc | 010,100,001 |
It can be seen from table 1：The voltage waveform at R3 two ends opens sequence, Ke Yitong depending on each bridge arm switching tube of inverter
Cross the state of the voltage pulse of software detection voltage sensor, judge inverter whether neutral ground.Specifically, earth-free
In the case of the voltage at R3 two ends be always 1/3Udc, the amplitude obtained according to the voltage for 1/3Udc be approximately straight line ripple
Shape.If generation neutral ground, the sequence of switching tube is determined by the software control of process chip, and being controlled by software can be with
Each switching tube is set not open or turn off in the same time so that the waveform for being originally used for straight line changes, the process chip
According to the voltage, and the inverter circuit three phase bridge arms switching tube state, determine the inverter electricity
Whether the neutral point on road is grounded.
For example, the processor chips determine that the voltage is reduced to 0, and the bridge of three phases of the inverter circuit
In arm, the upper switching tube of each bridge arm is not turned on, and the lower switching tube of each bridge arm is both turned on, it is determined that the inverter circuit
Neutral ground.The sequence of opening of switching tube is 000, and under such a opening state, the voltage at R3 two ends can be changed into 0.
For another example, the processor chips determine that the voltage is increased to the voltage in the intermediate dc loop, and described inverse
In the bridge arm for three phases for becoming device circuit, the upper switching tube of each bridge arm is both turned on, and the lower switching tube of each bridge arm is not led
It is logical, it is determined that the neutral ground of the inverter circuit.The sequence of opening of switching tube is 111, under such a opening state, R3
The voltage at two ends can be changed into Udc.
And for example, the processor chips determine that the voltage is increased to twice of the reference voltage, and the inverter
In the bridge arm of three phases of circuit, the upper switch conduction of the bridge arm of two phases, the lower switching tube of the bridge arm of excess phase is led
It is logical, it is determined that the neutral ground of the inverter circuit；Switching tube have 110,011,101 these three open situation, herein
Plant under opening state, the voltage at R3 two ends can be changed into 2/3Udc.
And for example, the processor chips determine that the voltage keeps the reference voltage constant, and the inverter circuit
Three phases bridge arm in, the lower switch conduction of the bridge arm of two phases, the bridge arm of excess phase upper switching tube conducting, then
Determine the neutral ground of the inverter circuit.Switching tube have 010,100,001 these three open situation, at this moment,
The voltage at R3 two ends can be changed into 1/3Udc.
Summary is understood：Compared to waveform of the amplitude in the case of earth-free for 1/3Udc near linear, in neutral point
When there is ground state, R3 both end voltages waveform is the impulse waveform that amplitude changes between 0,1/3Udc, 2/3Udc, Udc, its
Impulse waveform is the voltage by the R3 two ends under eight kinds of different switching tube opening states according to the different control modes institute of switching tube
Combine.
In the above method, detected by the sequence of opening of the switching tube of each bridge arm to inverter circuit, to
The voltage at three resistance two ends is monitored, and realizes the detection of the neutral point failure of inverter circuit.
Finally it should be noted that：Various embodiments above is only to the technical scheme for illustrating the application, rather than its limitations；To the greatest extent
The application is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from each embodiment technology of the application
The scope of scheme.
Claims (4)
1. a kind of grounded inspection circuit, it is characterised in that including：Chopper circuit, intermediate dc loop and the inversion being connected in parallel
Device circuit, and voltage sensor and process chip, wherein,
The intermediate dc loop includes the offset divider resistance detection circuit being connected in parallel and electric capacity；
The offset divider resistance detection circuit includes first resistor, second resistance and the 3rd resistor being sequentially connected in series, described
3rd resistor is in parallel with the voltage sensor, and the tie point of the 3rd resistor and the second resistance is grounded；
The one end of the voltage sensor away from the tie point is connected with the process chip；
The chopper circuit includes braking resistor, the upper copped wave pipe that is connected in series and lower copped wave pipe, the braking resistor with it is described
Lower copped wave pipe is in parallel, and the upper copped wave pipe is connected with the positive pole in the intermediate dc loop, the lower copped wave pipe and the centre
The negative pole connection of DC loop；
When not occurring earth fault, the voltage at the 3rd resistor two ends and the difference of reference voltage meet predetermined threshold value, described
Reference voltage is 1/3rd of the voltage in the intermediate dc loop.
2. circuit according to claim 1, it is characterised in that the first resistor, the second resistance and the described 3rd
The resistance of resistance is identical.
3. circuit according to claim 1 or 2, it is characterised in that the inverter circuit includes inverter, the inversion
The bridge arm of each phase of device connects a upper switching tube and a lower switching tube, and the upper switching tube is returned with the intermediate dc
The positive pole connection on road, the lower switching tube is connected with the negative pole in the intermediate dc loop.
4. circuit according to claim 1 or 2, it is characterised in that the process chip passes through traction control unit and institute
State voltage sensor connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621242433.9U CN206321736U (en) | 2016-11-21 | 2016-11-21 | Grounded inspection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621242433.9U CN206321736U (en) | 2016-11-21 | 2016-11-21 | Grounded inspection circuit |
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| CN201621242433.9U Withdrawn - After Issue CN206321736U (en) | 2016-11-21 | 2016-11-21 | Grounded inspection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597190A (en) * | 2016-11-21 | 2017-04-26 | 中车大连电力牵引研发中心有限公司 | Grounding detection circuit and method |
| CN107797018A (en) * | 2017-11-03 | 2018-03-13 | 中车大连电力牵引研发中心有限公司 | Diesel locomotive grounded inspection circuit, device and method |
| CN109557413A (en) * | 2017-09-26 | 2019-04-02 | 株洲中车时代电气股份有限公司 | A kind of locomotive major loop ground independent positioning method and device |
| CN111130329A (en) * | 2018-10-31 | 2020-05-08 | 中车永济电机有限公司 | Intermediate direct current circuit of traction converter and traction converter |
| CN112881940A (en) * | 2019-11-14 | 2021-06-01 | 华为技术有限公司 | Grounding state detection circuit, electrical system and grounding state detection method thereof |
-
2016
- 2016-11-21 CN CN201621242433.9U patent/CN206321736U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597190A (en) * | 2016-11-21 | 2017-04-26 | 中车大连电力牵引研发中心有限公司 | Grounding detection circuit and method |
| CN106597190B (en) * | 2016-11-21 | 2023-07-18 | 中车大连电力牵引研发中心有限公司 | Grounding detection circuit and method |
| CN109557413A (en) * | 2017-09-26 | 2019-04-02 | 株洲中车时代电气股份有限公司 | A kind of locomotive major loop ground independent positioning method and device |
| CN107797018A (en) * | 2017-11-03 | 2018-03-13 | 中车大连电力牵引研发中心有限公司 | Diesel locomotive grounded inspection circuit, device and method |
| CN111130329A (en) * | 2018-10-31 | 2020-05-08 | 中车永济电机有限公司 | Intermediate direct current circuit of traction converter and traction converter |
| CN112881940A (en) * | 2019-11-14 | 2021-06-01 | 华为技术有限公司 | Grounding state detection circuit, electrical system and grounding state detection method thereof |
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