CN109765430A - A kind of insulation impedance detection system and detection method - Google Patents
A kind of insulation impedance detection system and detection method Download PDFInfo
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- CN109765430A CN109765430A CN201910232963.7A CN201910232963A CN109765430A CN 109765430 A CN109765430 A CN 109765430A CN 201910232963 A CN201910232963 A CN 201910232963A CN 109765430 A CN109765430 A CN 109765430A
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Abstract
The invention discloses a kind of insulation impedance detection system and detection methods, it include: standard bias resistance switching module, insulate data acquisition module, pull up bias supply acquisition module, filter module and processor module, first pull-up biasing supply voltage and second pull-up biasing supply voltage of the processor module based on pull-up bias supply acquisition module output, and the first positive collection voltages of filter module output, first cathode collection voltages, second positive collection voltages and the second cathode collection voltages, obtain the impedance value of the positive ground insulation resistance in high-pressure system and the impedance value of cathode ground insulation resistance, and then determine the state of insulation of high-pressure system.The present invention is by the ripple interference in filtering module for filtering off high-pressure system, and the process for obtaining the impedance value of positive ground insulation resistance and the impedance value of cathode ground insulation resistance is unrelated with high voltage power supply, to improve the detection accuracy to insulation impedance.
Description
Technical field
The present invention relates to electric vehicle engineering fields, more specifically, being related to a kind of insulation impedance detection system and detection
Method.
Background technique
Currently, many components in electric car, comprising: power battery, motor, charger, energy recycle device, auxiliary
Battery charger etc. can all be related to High-Voltage Electrical Appliances Insulation Problems, therefore, for the functional reliability for improving electric car, usually need
Insulation impedance in electric car is detected.
There are mainly two types of detection methods in the prior art, and one is AC signal injection method, another kind is outer connecting resistance
Method.(1) AC signal injection method are as follows: the low-voltage ac signal of certain frequency is injected between power battery positive and negative anodes as test
Signal obtains the insulation impedance of electrokinetic cell system by measuring the feedback of high-pressure system.Since test signal is in high-pressure system
Middle formation ripple interference, therefore the ripple signal of high-pressure system is caused to increase, to influence to lead the measurement accuracy of insulation impedance
Cause wrong diagnosis.(2) a series of external electric-resistivity method are as follows: resistance are accessed between power battery positive and negative anodes, by opening in control circuit
The on-off of pass obtains high-pressure system to obtain voltage value of the insulation impedance under on off operating mode by listing circuit state equation
The expression formula of positive ground insulation resistance and the expression formula of high-pressure system cathode ground insulation resistance.Due to equal in two expression formulas
It is related to high voltage power supply, and the voltage class of high voltage power supply covers the wide scope of 90V~500V, in electric car operational process,
The voltage value of high voltage power supply can occur frequently to change, and the voltage value so as to cause collected high voltage power supply is unstable, therefore, hold
Easily leading to the insulation impedance of acquisition, there are large errors, or even invalid.
To sum up, a kind of insulation impedance detection system and detection method how to be provided to improve the detection essence to insulation impedance
The technical issues of spending, becoming those skilled in the art's urgent need to resolve.
Summary of the invention
In view of this, the present invention discloses a kind of insulation impedance detection system and detection method, pass through filter module to realize
Come filter out the ripple in high-pressure system interference, effectively avoid because ripple signal increase, and influence the measurement accuracy of insulation impedance with
And bring wrong diagnosis；Also, the impedance value of the positive ground insulation resistance that the present invention obtains and cathode ground insulation resistance
The process of impedance value is unrelated with high voltage power supply, so as to avoid the voltage value because of high voltage power supply in electric car operational process
Unstable and bring error, improve the detection accuracy to insulation impedance.
A kind of insulation impedance detection system, comprising:
Standard bias resistance switching module, in the positive input terminal and high-pressure system of the standard bias resistance switching module just
Pole ground insulation resistance is connected with the common end of high voltage power supply, the negative input end of the standard bias resistance switching module with it is described
Cathode ground insulation resistance is connected with the common end of the high voltage power supply in high-pressure system；
Insulate data acquisition module, and the positive input terminal and the standard bias resistance of the insulation data acquisition module switch
The positive output end of module connects, the negative input end of the insulation data acquisition module and the standard bias resistance switching module
The power end of negative output terminal connection, the insulation data acquisition module is connect with pull-up bias supply, the insulation data acquisition
Module is used to be biased the cathode voltage and cathode voltage of acquisition respectively conversion, and after cathode output end output biasing
Cathode voltage, the cathode voltage after cathode output end output biasing；
Pull up bias supply acquisition module, the input terminal of the pull-up bias supply acquisition module and the pull-up biased electrical
Source connection, for acquiring and exporting pull-up biasing supply voltage；
Filter module, the positive input terminal of the filter module are connect with the positive output end of the insulation data acquisition module,
The positive output end of the filter module is used to export to the positive collection voltages obtained after the cathode voltage filtering after the biasing；
The negative input end of the filter module is connect with the negative output terminal of the insulation data acquisition module, and bearing for the filter module is defeated
Outlet is used to export to the cathode collection voltages obtained after the cathode voltage filtering after the biasing；
Processor module, the processor module respectively with the control terminal of the standard bias resistance switching module, described
The control terminal of data acquisition module, the output end of the pull-up bias supply acquisition module and the filter module insulate just
Output end is connected with negative output terminal, and the processor module is used for based on pull-up biasing supply voltage, the anode acquisition
Voltage and the cathode collection voltages determine that the impedance value and cathode of positive ground insulation resistance in the high-pressure system are exhausted over the ground
The impedance value of edge impedance, and based on default insulation fault judgment criteria, the impedance value of the positive ground insulation resistance and described
The impedance value of cathode ground insulation resistance determines the state of insulation of the high-pressure system.
Preferably, the standard bias resistance switching module includes: positive standard bias resistance, positive biasing resistor switching
Switch, cathode standard bias resistance and cathode biasing resistor switching switch；
One end of the anode standard bias resistance connects the public affairs of the positive ground insulation resistance and the high voltage power supply
The other end at end altogether, the anode standard bias resistance passes through the positive biasing resistor switching switch ground connection；
One end of the cathode standard bias resistance connects the public affairs of the cathode ground insulation resistance and the high voltage power supply
The other end at end altogether, the cathode standard bias resistance passes through cathode biasing resistor switching switch ground connection；
The control terminal of the cathode biasing resistor switching switch and the control terminal of the positive biasing resistor switching switch are equal
As the control terminal of the standard bias resistance switching module, it is connect with the processor module.
Preferably, the insulation data acquisition module includes: the first positive divider resistance, the second positive divider resistance, the
One cathode divider resistance, the second cathode divider resistance, anode pull-up biasing resistor, cathode pull-up biasing resistor, first switch and
Second switch；
Positive input terminal and standard bias electricity of the one end of the first switch as the insulation data acquisition module
The positive output end connection of switching module is hindered, the other end of the first switch passes through first anode point being sequentially connected in series
Piezoresistance and the second positive divider resistance ground connection, one end connection of the anode pull-up biasing resistor first anode point
The common end of piezoresistance and the second positive divider resistance, the other end of the anode pull-up biasing resistor connect the pull-up
Bias supply；
Negative input end and standard bias electricity of the one end of the second switch as the insulation data acquisition module
The negative output terminal connection of switching module is hindered, the other end of the second switch passes through first cathode point being sequentially connected in series
One end of piezoresistance and the second cathode divider resistance ground connection, the cathode pull-up biasing resistor connects first cathode point
The other end of the common end of piezoresistance and the second cathode divider resistance, the cathode pull-up biasing resistor connects the pull-up
Bias supply；
The control terminal of the first switch and the control terminal of the second switch are used as the insulation data acquisition module
Control terminal, connect with the processor module.
Preferably, the pull-up bias supply acquisition module includes: first resistor, second resistance and filter capacitor；
One end of the first resistor connects the pull-up bias supply, and the other end of the first resistor passes through described the
Two resistance eutral groundings, one end of the filter capacitor connect the common end of the first resistor and the second resistance, the filtering
The other end of capacitor is grounded；
It is adopted as the pull-up bias supply common end of the first resistor, the second resistance and the filter capacitor
The output end of collection module is connect with the processor module.
Preferably, the filter module includes: positive filter branch and cathode filter branch；
The input terminal of the anode filter branch is acquired as the positive input terminal of the filter module and the insulation data
The positive output end of module connects, positive output end and the place of the output end of the anode filter branch as the filter module
The connection of device module is managed, the anode filter branch obtains the anode for being filtered to the cathode voltage after the biasing
Collection voltages；
The input terminal of the cathode filter branch is acquired as the negative input end of the filter module and the insulation data
The negative output terminal of module connects, negative output terminal and the place of the output end of the cathode filter branch as the filter module
The connection of device module is managed, the cathode filter branch obtains the cathode for being filtered to the cathode voltage after the biasing
Collection voltages.
Preferably, the positive filter branch include: the first positive filter resistance, the second positive filter resistance, first just
Pole filter capacitor and the second positive filter capacitor；
One end of the first positive filter resistance is connect with the positive output end for insulating data acquisition module, and described the
The other end of one positive filter resistance passes through the described first positive filter capacitor ground connection, one end of the described second positive filter resistance
The common end of the described first positive filter resistance and the first positive filter capacitor is connected, the described second positive filter resistance
The other end passes through the described second positive filter capacitor ground connection, the described second positive filter resistance and the second positive filter capacitor
Output end of the common end as the positive filter branch；
The cathode filter branch includes: the first cathode filter resistance, the second cathode filter resistance, the first cathode filtered electrical
Hold and the second cathode filter capacitor；
One end of the first cathode filter resistance is connect with the negative output terminal of the insulation data acquisition module, and described the
The other end of one cathode filter resistance is grounded by the first cathode filter capacitor, one end of the second cathode filter resistance
The common end of the first cathode filter resistance and the first cathode filter capacitor is connected, the second cathode filter resistance
The other end is grounded by the second cathode filter capacitor, the second cathode filter resistance and the second cathode filter capacitor
Output end of the common end as the cathode filter branch.
A kind of insulation impedance detection method, applied to the processor module in insulation impedance detection system described above,
Include:
Control insulation data acquisition module work, while controlling standard bias resistance switching module and stopping working；
The the first pull-up biasing supply voltage, filter module of acquisition pull-up bias supply acquisition module output are just defeated respectively
The positive collection voltages of the first of outlet output and the first cathode collection voltages in negative output terminal output；
The size relation for comparing the described first positive collection voltages and the first cathode collection voltages, obtains comparing knot
Fruit, while controlling the standard bias resistance switching module work；
When the working time of the standard bias resistance switching module reaching preset time, result control based on the comparison
Making the resistance to work in the standard bias resistance switching module is cathode biasing resistor or positive biasing resistor；
The second pull-up biasing supply voltage, the filtering mould of the pull-up bias supply acquisition module output is acquired again
The second positive collection voltages that block is exported in positive output end and in the second cathode collection voltages of negative output terminal output；
Based on the first pull-up biasing supply voltage, the first positive collection voltages, first cathode acquisition electricity
Pressure, the second pull-up biasing supply voltage, the second positive collection voltages and the second cathode collection voltages, obtain height
The impedance value of positive ground insulation resistance in pressure system and the impedance value of cathode ground insulation resistance；
It is exhausted over the ground based on default insulation fault judgment criteria, the impedance value of the positive ground insulation resistance and the cathode
The impedance value of edge impedance determines the state of insulation of high-pressure system.
Preferably, described when the working time of the standard bias resistance switching module reaching preset time, it is based on institute
Stating comparison result and controlling the resistance to work in the standard bias resistance switching module is cathode biasing resistor or positive biased electrical
Resistance, specifically includes:
Reach the preset time when the working time of the standard bias resistance switching module, and first anode is adopted
When collecting voltage is greater than the first cathode collection voltages, the only anode biasing in the standard bias resistance switching module is controlled
Resistance performance；
Reach the preset time when the working time of the standard bias resistance switching module, and first anode is adopted
When collecting voltage is less than the first cathode collection voltages, the only cathode biasing in the standard bias resistance switching module is controlled
Resistance performance.
Preferably, described based on the first pull-up biasing supply voltage, the first positive collection voltages, described first
Cathode collection voltages, the second pull-up biasing supply voltage, the second positive collection voltages and second cathode acquisition
Voltage obtains the impedance value of the positive ground insulation resistance in high-pressure system and the impedance value of cathode ground insulation resistance, specifically
Include:
When the described first positive collection voltages are greater than the first cathode collection voltages, the anode ground insulation resistance
Impedance value calculating process it is as follows:
When the described first positive collection voltages are greater than the first cathode collection voltages, the cathode ground insulation resistance
Impedance value calculating process it is as follows:
In formula, Ri1For the positive ground insulation resistance, U1For the described first positive collection voltages, U2It is negative for described first
Pole collection voltages, U01For the first pull-up biasing supply voltage, U3For the described second positive collection voltages, U4It is described second
Cathode collection voltages, U02For the second pull-up biasing supply voltage, R01For in the standard bias resistance switching module just
The quasi- biasing resistor of pole marks, R1For the first positive divider resistance, R in the insulation data acquisition module2It is adopted for the insulation data
Collect the second positive divider resistance, R in module4For the first cathode divider resistance, the R in the insulation data acquisition module5For institute
State the second cathode divider resistance, the R in insulation data acquisition module3For the positive pull up bias in the insulation data acquisition module
Set resistance, R6Biasing resistor, R are pulled up for the cathode in the insulation data acquisition modulei2For the cathode ground insulation resistance.
Preferably, described based on the first pull-up biasing supply voltage, the first positive collection voltages, the acquisition of the first cathode
Voltage, the second pull-up biasing supply voltage, the second positive collection voltages and the second cathode collection voltages, obtain in high-pressure system
The impedance value of positive ground insulation resistance and the impedance value of cathode ground insulation resistance, specifically include:
When the described first positive collection voltages are less than the first cathode collection voltages, the anode ground insulation resistance
Impedance value calculating process it is as follows:
When the described first positive collection voltages are less than the first cathode collection voltages, the cathode ground insulation resistance
Impedance value calculating process it is as follows:
In formula, Ri1For the positive ground insulation resistance, U1For the described first positive collection voltages, U2It is negative for described first
Pole collection voltages, U01For the first pull-up biasing supply voltage, U3For the described second positive collection voltages, U4It is described second
Cathode collection voltages, U02For the second pull-up biasing supply voltage, R02It is negative in the standard bias resistance switching module
The quasi- biasing resistor of pole marks, R1For the first positive divider resistance, R in the insulation data acquisition module2It is adopted for the insulation data
Collect the second positive divider resistance, R in module4For the first cathode divider resistance, the R in the insulation data acquisition module5For institute
State the second cathode divider resistance, the R in insulation data acquisition module3For the positive pull up bias in the insulation data acquisition module
Set resistance, R6Biasing resistor, R are pulled up for the cathode in the insulation data acquisition modulei2For the cathode ground insulation resistance.
From above-mentioned technical solution it is found that the invention discloses a kind of insulation impedance detection system and detection methods, comprising:
Standard bias resistance switching module, insulation data acquisition module, pull-up bias supply acquisition module, filter module and processor die
Block, processor module control insulation data acquisition module work, while controlling standard bias resistance switching module and stopping working, and
The first pull-up of acquisition pull-up bias supply acquisition module output biases the first anode of supply voltage, filter module output respectively
Collection voltages and the first cathode collection voltages are closed in the size for comparing the first positive collection voltages and the first cathode collection voltages
After system, control standard bias resistance switching module work preset time is then based on size comparison result control standard bias electricity
The resistance to work in resistance switching module is cathode biasing resistor or positive biasing resistor, and acquisition pulls up bias supply acquisition again
The the second positive collection voltages and the second cathode acquisition electricity that the second pull-up biasing supply voltage, the filter module of module output export
Pressure, thus based on the first pull-up biasing supply voltage, the first positive collection voltages, the first cathode collection voltages, the second pull up bias
Supply voltage, the second positive collection voltages and the second cathode collection voltages are set, the positive insulation against ground resistance in high-pressure system is obtained
The impedance value of anti-impedance value and cathode ground insulation resistance, and then determine the state of insulation of high-pressure system.Relative to tradition side
Case, invention increases pull-up bias supply acquisition module and filter modules, by filtering module for filtering off high-pressure system
Ripple interference effectively prevents increasing because of ripple signal, and influences the measurement accuracy and bring wrong diagnosis of insulation impedance；And
And the process of the obtained impedance value of positive ground insulation resistance of the present invention and the impedance value of cathode ground insulation resistance with height
Voltage source is unrelated, so as to avoid bring is missed due to unstable in electric car operational process of the voltage value of high voltage power supply
Difference improves the detection accuracy to insulation impedance.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
Disclosed attached drawing obtains other attached drawings.
Fig. 1 is a kind of insulation impedance detection system block diagram of high-pressure system disclosed by the embodiments of the present invention；
Fig. 2 is a kind of insulation resistance detection circuit figure of high-pressure system disclosed by the embodiments of the present invention；
Fig. 3 is a kind of insulation resistance detection circuit figure of high-pressure system disclosed by the embodiments of the present invention；
Fig. 4 is a kind of insulation resistance detection circuit figure of high-pressure system disclosed by the embodiments of the present invention；
Fig. 5 is a kind of insulation resistance detection circuit figure of high-pressure system disclosed by the embodiments of the present invention；
Fig. 6 is a kind of insulation resistance detection circuit figure of high-pressure system disclosed by the embodiments of the present invention；
Fig. 7 is a kind of insulation impedance detection method flow chart of high-pressure system disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of insulation impedance detection system and detection methods, comprising: standard bias resistance is cut
Change the mold block, insulation data acquisition module, pull-up bias supply acquisition module, filter module and processor module, processor module
Control insulation data acquisition module work, while controlling standard bias resistance switching module and stopping working, and acquisition pull-up respectively
First pull-up biasing supply voltage of bias supply acquisition module output, the first positive collection voltages of filter module output and
First cathode collection voltages, after comparing the size relation of the first positive collection voltages and the first cathode collection voltages, control mark
Quasi- biasing resistor switching module work preset time is then based in size comparison result control standard bias resistance switching module
The resistance of work is cathode biasing resistor or positive biasing resistor, and the of acquisition pull-up bias supply acquisition module output again
The the second positive collection voltages and the second cathode collection voltages that two pull-up biasing supply voltages, filter module export, to be based on
First pull-up biasing supply voltage, the first positive collection voltages, the first cathode collection voltages, the second pull-up biasing supply voltage,
Second positive collection voltages and the second cathode collection voltages, obtain the positive ground insulation resistance in high-pressure system impedance value and
The impedance value of cathode ground insulation resistance, and then determine the state of insulation of high-pressure system.Relative to traditional scheme, the present invention increases
Pull-up bias supply acquisition module and filter module are interfered, effectively by the ripple in filtering module for filtering off high-pressure system
It avoids because ripple signal increases, and influences the measurement accuracy and bring wrong diagnosis of insulation impedance；Also, the present invention obtains
Positive ground insulation resistance impedance value and cathode ground insulation resistance impedance value process it is unrelated with high voltage power supply, from
And bring error due to unstable in electric car operational process is avoided because of the voltage value of high voltage power supply, it improves to exhausted
The detection accuracy of edge impedance.
Referring to Fig. 1, a kind of insulation impedance detection system block diagram of high-pressure system, the insulation disclosed in one embodiment of the invention
Impedance detection system is connect with high-pressure system, referring to fig. 2, a kind of insulation impedance of high-pressure system disclosed in one embodiment of the invention
Detection circuit figure, high-pressure system 10 include: high voltage power supply U, positive ground insulation resistance Ri1, cathode ground insulation resistance Ri2, just
Pole Y capacitance C over the groundi1With cathode Y capacitance C over the groundi2, positive ground insulation resistance Ri1With positive Y capacitance C over the groundi1It is connected in parallel
Between the anode and ground of high voltage power supply U, cathode ground insulation resistance Ri2With cathode Y capacitance C over the groundi2It is connected in high-voltage electricity in parallel
Between the cathode and ground of source U.It should be noted that positive ground insulation resistance Ri1With cathode ground insulation resistance Ri2Namely by
Survey insulation impedance, Y capacitance namely safety capacitor.
Insulation impedance detection system includes: standard bias resistance switching module 11, insulation data acquisition module 12, pull up bias
Set power supply acquisition module 13, filter module 14 and processor module 15；
Wherein:
Positive ground insulation resistance R in the positive input terminal and high-pressure system of standard bias resistance switching module 11i1And high pressure
The common end of power supply U connects, cathode insulation against ground resistance in the negative input end and high-pressure system of standard bias resistance switching module 11
Anti- Ri2It is connected with the common end of high voltage power supply U.
Wherein, referring to fig. 2, standard bias resistance switching module 11 can specifically include: positive standard bias resistance R01, just
Pole biasing resistor switches switch S3, cathode standard bias resistance R02Switch switch S with cathode biasing resistor4；
Positive standard bias resistance R01One end connect positive ground insulation resistance Ri1With the common end of high voltage power supply U, just
The quasi- biasing resistor R of pole marks01The other end pass through positive biasing resistor and switch switch S3Ground connection；
Cathode standard bias resistance R02One end connect cathode ground insulation resistance Ri2With the common end of high voltage power supply U, bear
The quasi- biasing resistor R of pole marks02The other end by cathode biasing resistor switching switch ground connection S4；
Cathode biasing resistor switches switch S4Control terminal and positive biasing resistor switch switch S3Control terminal as mark
The control terminal of quasi- biasing resistor switching module 11, connect with processor module 15, and can be sent according to processor module 15
Turn-on and turn-off signal executes the operation of corresponding turn-on and turn-off.
The positive input terminal of insulation data acquisition module 12 is connect with the positive output end of standard bias resistance switching module 11, absolutely
The negative input end of edge data acquisition module 12 is connect with the negative output terminal of standard bias resistance switching module 11, insulation data acquisition
The power end of module 12 is connect with pull-up bias supply (not shown in figure 1), and insulation data acquisition module 12 is used for acquisition
Cathode voltage and cathode voltage are biased conversion, and the cathode voltage after cathode output end output biasing respectively, in cathode
Cathode voltage after output end output biasing.
Wherein, referring to fig. 2, insulation data acquisition module 12 can specifically include: the first positive divider resistance R1, second just
Pole divider resistance R2, the first cathode divider resistance R4, the second cathode divider resistance R5, anode pull-up biasing resistor R3, cathode pull-up
Biasing resistor R6, first switch S1With second switch S2；
First switch S1One end as insulation data acquisition module 12 positive input terminal and standard bias resistance switch mould
The positive output end of block 11 connects, specifically with positive standard bias resistance R01It is connected with the common end of high voltage power supply U, first switch S1
The other end pass through the positive divider resistance R of first be sequentially connected in series1With the second positive divider resistance R2Ground connection, anode pull-up
Biasing resistor R3The positive divider resistance R of one end connection first1With the second positive divider resistance R2Common end, positive pull up bias
Set resistance R3The other end connection pull-up bias supply VCC；
Second switch S2One end as insulation data acquisition module 12 negative input end and standard bias resistance switch mould
The negative output terminal of block 11 connects, specifically with cathode standard bias resistance R02It is connected with the common end of high voltage power supply U, second switch S2
The other end pass through the first cathode divider resistance R for being sequentially connected in series4With the second cathode divider resistance R5Ground connection, cathode pull-up
Biasing resistor R6One end connect the first cathode divider resistance R4With the second cathode divider resistance R5Common end, cathode pull up bias
Set resistance R6The other end connection pull-up bias supply VCC；
First switch S1Control terminal and second switch S2Control terminal as insulation data acquisition module 12 control
End, connect with processor module 15, and the turn-on and turn-off signal that can be sent according to processor module 15, execution are led accordingly
Logical and shutdown operation.
It should be strongly noted that the positive pole marks to improve accuracy of data acquisition, in standard bias resistance switching module 11
Quasi- biasing resistor R01With cathode standard bias resistance R02, and the first positive divider resistance in insulation data acquisition module 12
R1, the second positive divider resistance R2, the first cathode divider resistance R4, the second cathode divider resistance R5, anode pull-up biasing resistor R3
Biasing resistor R is pulled up with cathode6Be all made of high-precision biasing resistor, can specifically use precision for 0.1% or more biased electrical
Resistance.
The input terminal for pulling up bias supply acquisition module 13 is connect with pull-up bias supply VCC, for acquiring and exporting
Draw bias supply voltage.
Wherein, referring to fig. 2, pull-up bias supply acquisition module 13 can specifically include: first resistor R11, second resistance
R12With filter capacitor C5；
First resistor R11One end connection pull-up bias supply VCC, first resistor R11The other end pass through second resistance R12
Ground connection, filter capacitor C5One end connect first resistor R11With second resistance R12Common end, filter capacitor C5Another termination
Ground；
First resistor R11, second resistance R12With filter capacitor C5Common end as pull-up bias supply acquisition module 13
Output end is connect with processor module 15, and the pull-up of acquisition biasing supply voltage is exported to processor module 15.
The positive input terminal of filter module 14 is connect with the positive output end of insulation data acquisition module 12, and filter module 14 is just
Output end is used to export the cathode voltage after biasing is filtered after obtained positive collection voltages；Bearing for filter module 14 is defeated
Enter end to connect with the negative output terminal for the data acquisition module 12 that insulate, after the negative output terminal of filter module 14 is for exporting to biasing
The cathode collection voltages that cathode voltage obtains after being filtered.
Wherein, referring to fig. 2, filter module 14 can specifically include: positive filter branch and cathode filter branch；
The input terminal of positive filter branch as filter module 14 positive input terminal and insulation data acquisition module 12 just
Output end connection, the output end of positive filter branch are connect as the positive output end of filter module 14 with processor module 15, just
Pole filter branch obtains positive collection voltages for being filtered to the cathode voltage after biasing；
The input terminal of cathode filter branch is as the negative input end of filter module 14 and bearing for insulation data acquisition module 12
Output end connection, the output end of cathode filter branch are connect as the negative output terminal of filter module 14 with processor module 15, are born
Pole filter branch obtains cathode collection voltages for being filtered to the cathode voltage after biasing.
It should be noted that level-one filter circuit or multiple-stage filtering can be used in positive filter branch and cathode filter branch
Circuit, in the present embodiment, positive filter branch and the preferred secondary filter circuit of cathode filter branch.
When positive filter branch and cathode filter branch are secondary filter circuit, referring to fig. 2, positive filter branch can
To include: the first positive filter resistance R7, the second positive filter resistance R8, the first positive filter capacitor C1With the second anode filtering
Capacitor C2；
Wherein, the first positive filter resistance R7One end with insulation data acquisition module 12 positive output end connect, specifically
With the first positive divider resistance R1, the second positive divider resistance R2Biasing resistor R is pulled up with anode3Common end connection, first just
Pole filter resistance R7The other end pass through the first positive filter capacitor C1Ground connection, the second positive filter resistance R8One end connection the
One positive filter resistance R7With the first positive filter capacitor C1Common end, the second positive filter resistance R8The other end pass through the
Two positive filter capacitor C2Ground connection, the second positive filter resistance R8With the second positive filter capacitor C2Common end as anode filter
The output end of wave branch；
Cathode filter branch may include: the first cathode filter resistance R9, the second cathode filter resistance R10, the first cathode filter
Wave capacitor C3With the second cathode filter capacitor C4；
Wherein, the first cathode filter resistance R9One end with insulation data acquisition module 12 negative output terminal connect, specifically
With the first cathode divider resistance R4, the second cathode divider resistance R5Biasing resistor R is pulled up with cathode6Common end connection, first is negative
Pole filter resistance R9The other end pass through the first cathode filter capacitor C3Ground connection, the second cathode filter resistance R10One end connection the
One cathode filter resistance R9With the first cathode filter capacitor C4Common end, the second cathode filter resistance R10The other end pass through the
Two cathode filter capacitor C4Ground connection, the second cathode filter resistance R10With the second cathode filter capacitor C4Common end as cathode filter
The output end of wave branch.
Processor module 15 respectively with the control terminal of standard bias resistance switching module 11, insulation data acquisition module 12
The positive output end of control terminal, the output end for pulling up bias supply acquisition module 13 and filter module 14 is connected with negative output terminal,
Pull-up biasing supply voltage, the filter module 14 that processor module 15 is used to export based on pull-up bias supply acquisition module 13
The cathode collection voltages of the negative output terminal output of the positive collection voltages and filter module 14 of positive output end output determine high pressure system
The positive impedance value of ground insulation resistance and the impedance value of cathode ground insulation resistance in system, and based on default insulation fault judgement
Standard, the positive impedance value of ground insulation resistance and the impedance value of cathode ground insulation resistance, determine the insulation shape of high-pressure system
State.
It is as follows the present invention provides the specific work process of insulation impedance detection system for convenience of understanding:
When original state, the control insulation data acquisition module 12 of processor module 15 works, while controlling standard bias electricity
Resistance switching module 11 stops working, i.e. first switch S of the processor module 15 into insulation data acquisition module 121It is opened with second
Close S2Continuity signal is sent, first switch S is made1With second switch S2It is closed, the first positive divider resistance R1, second anode point
Piezoresistance R2, the first cathode divider resistance R4With the second cathode divider resistance R5It accesses, to make the data acquisition module 12 that insulate
Work；The positive biasing resistor into standard bias resistance switching module 11 switches switch S simultaneously3Switch with cathode biasing resistor
Switch S4Cut-off signal is sent, positive biasing resistor switching switch S is made3Switch switch S with cathode biasing resistor4It disconnects, at this time
High-pressure system insulation resistance detection circuit figure it is as shown in Figure 3.
Pass through pull-up bias supply VCC and anode pull-up biasing resistor R3The anode that insulation data acquisition module 12 is exported
Voltage is biased conversion, the cathode voltage after being biased；Biasing resistor R is pulled up by pull-up bias supply VCC and cathode6
The cathode voltage exported to insulation data acquisition module 12 is biased conversion, the cathode voltage after being biased.
Positive filter branch in filter module 14, comprising: the first positive filter resistance R7, the second positive filter resistance R8、
First positive filter capacitor C1With the second positive filter capacitor C2, the cathode voltage after biasing is filtered, the first anode is obtained
Collection voltages U1；Cathode filter branch in filter module 14, comprising: the first cathode filter resistance R9, the second cathode filter resistance
R10, the first cathode filter capacitor C3With the second cathode filter capacitor C4, the cathode voltage after biasing is filtered, obtains first
Cathode collection voltages U2.At the same time, pull-up bias supply acquisition module 13 passes through first resistor R11, second resistance R12And filtering
Capacitor C5, acquisition the first pull-up biasing supply voltage U01。
Processor module 15 compares the first positive collection voltages U1With the first cathode collection voltages U2Size relation, obtain
Comparison result, simultaneous processor module 15 control standard bias resistance switching module 11 and work, i.e. processor module 15 is to standard
Positive biasing resistor in biasing resistor switching module 11 switches switch S3Switch switch S with cathode biasing resistor4Send conducting letter
Number, make positive biasing resistor switching switch S3Switch switch S with cathode biasing resistor4It is closed, positive standard bias resistance R01
With cathode standard bias resistance R02It accesses, the insulation resistance detection circuit figure of high-pressure system at this time is as shown in Figure 4.And it keeps
The state preset time T, the value of preset time T is according to the anode of high-pressure system Y capacitance C over the groundi1With cathode Y capacitance over the ground
Ci2It is demarcated.
When the working time of standard bias resistance switching module 11 reaching preset time T, according to the first anode acquisition electricity
Press U1With the first cathode collection voltages U2Size comparison result, carry out positive standard bias resistance R01With cathode standard bias electricity
Hinder R02Switching.
If U1>U2, then processor module 15 switches switch S to cathode biasing resistor4Cut-off signals are sent, cathode is biased
Resistance switches switch S4It disconnects, makes cathode standard bias resistance R02It stops working, the insulation impedance detection of high-pressure system at this time
Circuit diagram is as shown in Figure 5.
If U1< U2, then processor module 15 switches switch S to positive biasing resistor3Cut-off signals are sent, positive biasing is made
Resistance switches switch S3It disconnects, makes positive standard bias resistance R01It stops working, the insulation impedance detection of high-pressure system at this time
Circuit diagram is as shown in Figure 6.
Complete positive standard bias resistance R01With cathode standard bias resistance R02Switching after, processor module 15 is again
The second pull-up biasing supply voltage U that secondary acquisition pull-up bias supply acquisition module 13 exports02, filter module 14 is in positive output end
The positive collection voltages U of the second of output3And the second cathode collection voltages U in negative output terminal output4。
First positive collection voltages U of the processor module 15 based on acquisition1, the first cathode collection voltages U2, the first pull up bias
Set supply voltage U01, the second positive collection voltages U3, the second cathode collection voltages U4With the second pull-up biasing supply voltage U02, with
And positive standard bias resistance R01, cathode standard bias resistance R02, the first positive divider resistance R1, the second positive divider resistance
R2, the first cathode divider resistance R4, the second cathode divider resistance R5, anode pull-up biasing resistor R3, cathode pull up biasing resistor R6,
List positive ground insulation resistance Ri1With cathode ground insulation resistance Ri2Interlock circuit state equation, according to interlock circuit shape
State equation calculation goes out positive ground insulation resistance Ri1Impedance value and cathode ground insulation resistance Ri2Impedance value.
Positive ground insulation resistance Ri1With cathode ground insulation resistance Ri2Interlock circuit state equation it is as follows:
(1)U1>U2(i.e. Ri1> Ri2)
(2)U1< U2(i.e. Ri1< Ri2)
Positive ground insulation resistance R is being calculated in processor module 15i1Impedance value and cathode ground insulation resistance Ri2
Impedance value after, can be based on default insulation fault judgment criteria, positive ground insulation resistance Ri1Impedance value and cathode pair
Ground insulation impedance Ri2Impedance value, determine the state of insulation of high-pressure system.Specifically, according to " IEC60147-1 electric current to people and
The effect guide part 1 of domestic animal: common segment " illustrate, the harmless conveyance capacity current requirements < 10mA (DC) of human body or < 2mA
(AC), corresponding insulation resistance needs 100 Ω of >/V or > 500 Ω/V, determines in Ri1< U*500 Ω or Ri2< U*500 Ω, then report
Insulation fault, U are the voltage of high-pressure system.
In summary, insulation impedance detection system disclosed by the invention, comprising: standard bias resistance switching module 11, absolutely
Edge data acquisition module 12, pull-up bias supply acquisition module 13, filter module 14 and processor module 15, processor module 15
Control insulation data acquisition module 12 works, while controlling standard bias resistance switching module 11 and stopping working, and acquiring respectively
Pull up the first anode acquisition that the first pull-up biasing supply voltage, the filter module 14 that bias supply acquisition module 13 exports export
Voltage and the first cathode collection voltages, in the size relation for comparing the first positive collection voltages and the first cathode collection voltages
Afterwards, control standard bias resistance switching module 11 work preset time is then based on size comparison result control standard bias electricity
The resistance to work in resistance switching module 11 is cathode biasing resistor or positive biasing resistor, and acquisition pull-up bias supply is adopted again
The the second positive collection voltages and the second cathode that the second pull-up biasing supply voltage, the filter module 14 of collection module output export are adopted
Collecting voltage, thus based on the first pull-up biasing supply voltage, the first positive collection voltages, the first cathode collection voltages, second
Draw bias supply voltage, the second positive collection voltages and the second cathode collection voltages, the anode obtained in high-pressure system exhausted over the ground
The impedance value of edge impedance and the impedance value of cathode ground insulation resistance, and then determine the state of insulation of high-pressure system.Relative to biography
System scheme, invention increases pull-up bias supply acquisition module 13 and filter modules 14, filter out height by filter module 14
In pressure system ripple interference, thus effectively prevent because ripple signal increase, and influence insulation impedance measurement accuracy and
Bring wrong diagnosis；Also, the impedance value for the positive ground insulation resistance that the present invention obtains and the resistance of cathode ground insulation resistance
The process of anti-value is unrelated with high voltage power supply, so as to avoid the voltage value because of high voltage power supply in electric car operational process
Unstable and bring error, improves the detection accuracy to insulation impedance.
In addition, the present invention is adopted having acquired the first pull-up biasing supply voltage, the first positive collection voltages and the first cathode
After collecting voltage, standard can be closed while comparing the first positive collection voltages and the first cathode collection voltages size relation
Biasing resistor switching module 11, so that the distribution capacity to system charges, then according to the first positive collection voltages and
The size comparison result of first cathode collection voltages switches over positive standard bias resistance and cathode standard bias resistance.
The step reduces the charge and discharge time of system distribution capacity, to further reduce insulation data sampling time.
In insulation data acquisition module 12, biasing resistor is pulled up by pull-up bias supply and cathode, can be adopted negative
Sample data conversion is positive sampled data, allows processor module 15 directly and reads sampled data, without by resistance to negative
It after the AD conversion of pressure, then is acquired, to further reduced system cost.
Corresponding with the above system embodiment, the invention also discloses a kind of insulation impedance detection methods.
Referring to Fig. 7, a kind of flow chart of insulation impedance detection method, this method disclosed in one embodiment of the invention are applied to
Processor module in above-mentioned insulation impedance detection system, comprising steps of
Step S101, control insulation data acquisition module work, while controlling standard bias resistance switching module and stopping work
Make；
Step S102, the first pull-up of acquisition pull-up bias supply acquisition module output biases supply voltage, filtering respectively
The first positive collection voltages that module is exported in positive output end and in the first cathode collection voltages of negative output terminal output；
Step S103, the size relation for comparing the first positive collection voltages and the first cathode collection voltages, obtains comparing knot
Fruit, while controlling the work of standard bias resistance switching module；
Step S104, when the working time of standard bias resistance switching module reaching preset time, based on comparative result
The resistance to work in control standard bias resistance switching module is cathode biasing resistor or positive biasing resistor；
Specifically, when the working time of standard bias resistance switching module reaches preset time, and the first anode acquisition electricity
When pressure is greater than the first cathode collection voltages, only positive biasing resistor work in standard bias resistance switching module is controlled；
When the working time of standard bias resistance switching module reaches preset time, and the first positive collection voltages are less than the
When one cathode collection voltages, only cathode biasing resistor work in standard bias resistance switching module is controlled.
When the working time of standard bias resistance switching module reaches preset time, and the first positive collection voltages are equal to the
When one cathode collection voltages, only positive biasing resistor work, or control mark in standard bias resistance switching module can control
Only cathode biasing resistor works in quasi- biasing resistor switching module, and depending on concrete foundation actual needs, the present invention does not limit herein
It is fixed.
Step S105, the second pull-up of acquisition pull-up bias supply acquisition module output biases supply voltage, filtering again
The second positive collection voltages that module is exported in positive output end and in the second cathode collection voltages of negative output terminal output；
Step S106, based on the first pull-up biasing supply voltage, the first positive collection voltages, the first cathode collection voltages,
Second pull-up biasing supply voltage, the second positive collection voltages and the second cathode collection voltages, obtain the anode in high-pressure system
The impedance value of ground insulation resistance and the impedance value of cathode ground insulation resistance；
It should be noted that the specific implementation process of step S106 refers to system embodiment corresponding part, herein no longer
It repeats.
Step S107, over the ground based on default insulation fault judgment criteria, the impedance value of positive ground insulation resistance and cathode
The impedance value of insulation impedance determines the state of insulation of high-pressure system.
Specifically, illustrated according to " effect guide part 1 of the IEC60147-1 electric current to people and domestic animal: common segment ",
The harmless conveyance capacity current requirements < 10mA (DC) of human body or < 2mA (AC), corresponding insulation resistance need 100 Ω of >/V or > 500
Ω/V is determined in Ri1< U*500 Ω or Ri2< U*500 Ω, then report insulation fault, and U is the voltage of high-pressure system.
In summary, insulation impedance detection method disclosed by the invention, processor module control insulation data acquisition module
Work, while controlling standard bias resistance switching module and stopping working, and acquisition pull-up bias supply acquisition module output respectively
The first pull-up biasing supply voltage, filter module output the first positive collection voltages and the first cathode collection voltages,
After the size relation for comparing the first positive collection voltages and the first cathode collection voltages, standard bias resistance switching module work is controlled
Make preset time, being then based on the resistance to work in size comparison result control standard bias resistance switching module is cathode biasing
Resistance or positive biasing resistor, and again the second pull-up biasing supply voltage of acquisition pull-up bias supply acquisition module output,
The positive collection voltages of the second of filter module output and the second cathode collection voltages, thus based on the first pull-up bias supply electricity
Pressure, the first positive collection voltages, the first cathode collection voltages, the second pull-up biasing supply voltage, the second positive collection voltages and
Second cathode collection voltages obtain the impedance value and cathode ground insulation resistance of positive ground insulation resistance in high-pressure system
Impedance value, and then determine the state of insulation of high-pressure system.Relative to traditional scheme, invention increases pull-up bias supply acquisitions
Module and filter module are interfered by the ripple in filtering module for filtering off high-pressure system, to effectively prevent believing because of ripple
Number increase, and influences the measurement accuracy and bring wrong diagnosis of insulation impedance；Also, the positive insulation against ground that the present invention obtains
The process of the impedance value of the impedance value and cathode ground insulation resistance of impedance is unrelated with high voltage power supply, so as to avoid because of high pressure
Unstable in electric car operational process of the voltage value of power supply and bring error, improve the detection essence to insulation impedance
Degree.
It should be noted that the concrete operating principle of each step refers to system embodiment and corresponds to portion in embodiment of the method
Point, details are not described herein again.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of insulation impedance detection system characterized by comprising
Standard bias resistance switching module, anode is right in the positive input terminal and high-pressure system of the standard bias resistance switching module
Ground insulation impedance is connected with the common end of high voltage power supply, the negative input end of the standard bias resistance switching module and the high pressure
Cathode ground insulation resistance is connected with the common end of the high voltage power supply in system；
Insulate data acquisition module, the positive input terminal of the insulation data acquisition module and the standard bias resistance switching module
Positive output end connection, it is described insulation data acquisition module negative input end and bearing for the standard bias resistance switching module it is defeated
The power end of outlet connection, the insulation data acquisition module is connect with pull-up bias supply, the insulation data acquisition module
For to acquisition cathode voltage and cathode voltage be biased conversion respectively, and the anode after cathode output end output biasing
Voltage, the cathode voltage after cathode output end output biasing；
Bias supply acquisition module is pulled up, the input terminal and the pull-up bias supply of the pull-up bias supply acquisition module connect
It connects, for acquiring and exporting pull-up biasing supply voltage；
Filter module, the positive input terminal of the filter module is connect with the positive output end of the insulation data acquisition module, described
The positive output end of filter module is used to export to the positive collection voltages obtained after the cathode voltage filtering after the biasing；It is described
The negative input end of filter module is connect with the negative output terminal of the insulation data acquisition module, the negative output terminal of the filter module
For exporting to the cathode collection voltages obtained after the cathode voltage filtering after the biasing；
Processor module, the processor module respectively with the control terminal of the standard bias resistance switching module, the insulation
The positive output of the control terminal of data acquisition module, the output end of the pull-up bias supply acquisition module and the filter module
End is connected with negative output terminal, and the processor module is used for based on pull-up biasing supply voltage, the positive collection voltages
The impedance value of positive ground insulation resistance and cathode insulation against ground resistance in the high-pressure system are determined with the cathode collection voltages
Anti- impedance value, and impedance value and the cathode based on default insulation fault judgment criteria, the positive ground insulation resistance
The impedance value of ground insulation resistance determines the state of insulation of the high-pressure system.
2. insulation impedance detection system according to claim 1, which is characterized in that the standard bias resistance switching module
It include: positive standard bias resistance, positive biasing resistor switching switch, cathode standard bias resistance and the switching of cathode biasing resistor
Switch；
One end of the anode standard bias resistance connects the common end of the positive ground insulation resistance and the high voltage power supply,
The other end of the anode standard bias resistance passes through the positive biasing resistor switching switch ground connection；
One end of the cathode standard bias resistance connects the common end of the cathode ground insulation resistance and the high voltage power supply,
The other end of the cathode standard bias resistance passes through cathode biasing resistor switching switch ground connection；
The control terminal conduct of the control terminal of the cathode biasing resistor switching switch and the positive biasing resistor switching switch
The control terminal of the standard bias resistance switching module, connect with the processor module.
3. insulation impedance detection system according to claim 1, which is characterized in that the insulation data acquisition module packet
Include: the first positive divider resistance, the second positive divider resistance, the first cathode divider resistance, the second cathode divider resistance, on anode
Biasing resistor, cathode is drawn to pull up biasing resistor, first switch and the second switch；
It is cut as the positive input terminal of the insulation data acquisition module with the standard bias resistance one end of the first switch
The positive output end connection of block is changed the mold, the other end of the first switch passes through the first anode partial pressure electricity being sequentially connected in series
Resistance and the second positive divider resistance ground connection, one end connection of the anode pull-up biasing resistor the first anode partial pressure electricity
The common end of resistance and the second positive divider resistance, the other end of the anode pull-up biasing resistor connect the pull-up biasing
Power supply；
It is cut as the negative input end of the insulation data acquisition module with the standard bias resistance one end of the second switch
The negative output terminal connection of block is changed the mold, the other end of the second switch passes through first cathode partial pressure electricity being sequentially connected in series
Resistance and the second cathode divider resistance ground connection, one end of the cathode pull-up biasing resistor connect the first cathode partial pressure electricity
The common end of resistance and the second cathode divider resistance, the other end of the cathode pull-up biasing resistor connect the pull-up biasing
Power supply；
The control of the control terminal of the first switch and the control terminal of the second switch as the insulation data acquisition module
End processed is connect with the processor module.
4. insulation impedance detection system according to claim 1, which is characterized in that the pull-up bias supply acquisition module
It include: first resistor, second resistance and filter capacitor；
One end of the first resistor connects the pull-up bias supply, and the other end of the first resistor passes through second electricity
Resistance ground connection, one end of the filter capacitor connects the common end of the first resistor and the second resistance, the filter capacitor
The other end ground connection；
The common end of the first resistor, the second resistance and the filter capacitor acquires mould as the pull-up bias supply
The output end of block is connect with the processor module.
5. insulation impedance detection system according to claim 1, which is characterized in that the filter module includes: positive filter
Wave branch and cathode filter branch；
Positive input terminal and the insulation data acquisition module of the input terminal of the anode filter branch as the filter module
Positive output end connection, it is described anode filter branch output end as the filter module positive output end and the processor
Module connection, the anode filter branch obtain the anode acquisition for being filtered to the cathode voltage after the biasing
Voltage；
Negative input end and the insulation data acquisition module of the input terminal of the cathode filter branch as the filter module
Negative output terminal connection, the negative output terminal and the processor of the output end of the cathode filter branch as the filter module
Module connection, the cathode filter branch obtain the cathode acquisition for being filtered to the cathode voltage after the biasing
Voltage.
6. insulation impedance detection system according to claim 5, which is characterized in that the anode filter branch includes: the
One positive filter resistance, the second positive filter resistance, the first positive filter capacitor and the second positive filter capacitor；
One end of described first positive filter resistance is connect with the positive output end of the insulation data acquisition module, and described first just
The other end of pole filter resistance passes through the described first positive filter capacitor ground connection, one end connection of the described second positive filter resistance
The common end of the first positive filter resistance and the first positive filter capacitor, the described second positive filter resistance it is another
End passes through the described second positive filter capacitor ground connection, the public affairs of the described second positive filter resistance and the second positive filter capacitor
Output end of the end as the positive filter branch altogether；
The cathode filter branch include: the first cathode filter resistance, the second cathode filter resistance, the first cathode filter capacitor and
Second cathode filter capacitor；
One end of the first cathode filter resistance is connect with the negative output terminal of the insulation data acquisition module, and described first is negative
The other end of pole filter resistance is grounded by the first cathode filter capacitor, one end connection of the second cathode filter resistance
The common end of the first cathode filter resistance and the first cathode filter capacitor, the second cathode filter resistance it is another
End is grounded by the second cathode filter capacitor, the public affairs of the second cathode filter resistance and the second cathode filter capacitor
Output end of the end as the cathode filter branch altogether.
7. a kind of insulation impedance detection method, which is characterized in that be applied in insulation impedance detection system described in claim 1
Processor module, comprising:
Control insulation data acquisition module work, while controlling standard bias resistance switching module and stopping working；
The the first pull-up biasing supply voltage, filter module of acquisition pull-up bias supply acquisition module output are in positive output end respectively
The positive collection voltages of the first of output and the first cathode collection voltages in negative output terminal output；
The size relation for comparing the described first positive collection voltages and the first cathode collection voltages, obtains comparison result, together
When control standard bias resistance switching module work；
When the working time of the standard bias resistance switching module reaching preset time, result controls institute based on the comparison
Stating the resistance to work in standard bias resistance switching module is cathode biasing resistor or positive biasing resistor；
The second pull-up biasing supply voltage, the filter module for acquiring the pull-up bias supply acquisition module output again exist
The positive collection voltages of the second of positive output end output and the second cathode collection voltages in negative output terminal output；
Based on the first pull-up biasing supply voltage, the first positive collection voltages, the first cathode collection voltages, institute
The second pull-up biasing supply voltage, the second positive collection voltages and the second cathode collection voltages are stated, high pressure system is obtained
The impedance value of positive ground insulation resistance in system and the impedance value of cathode ground insulation resistance；
Based on default insulation fault judgment criteria, the impedance value of the positive ground insulation resistance and cathode insulation against ground resistance
Anti- impedance value determines the state of insulation of high-pressure system.
8. insulation impedance detection method according to claim 7, which is characterized in that described when the standard bias resistance is cut
When the working time of mold changing block reaches preset time, result is controlled in the standard bias resistance switching module based on the comparison
The resistance of work is cathode biasing resistor or positive biasing resistor, is specifically included:
Reach the preset time, and the first anode acquisition electricity when the working time of the standard bias resistance switching module
When pressure is greater than the first cathode collection voltages, the only positive biasing resistor is controlled in the standard bias resistance switching module
Work；
Reach the preset time, and the first anode acquisition electricity when the working time of the standard bias resistance switching module
When pressure is less than the first cathode collection voltages, the only cathode biasing resistor is controlled in the standard bias resistance switching module
Work.
9. insulation impedance detection method according to claim 7, which is characterized in that described based on the first pull-up biasing
Supply voltage, the first positive collection voltages, the first cathode collection voltages, the second pull-up biasing supply voltage,
Described second positive collection voltages and the second cathode collection voltages, obtain the positive ground insulation resistance in high-pressure system
The impedance value of impedance value and cathode ground insulation resistance, specifically includes:
When the described first positive collection voltages are greater than the first cathode collection voltages, the resistance of the anode ground insulation resistance
The calculating process of anti-value is as follows:
When the described first positive collection voltages are greater than the first cathode collection voltages, the resistance of the cathode ground insulation resistance
The calculating process of anti-value is as follows:
In formula, Ri1For the positive ground insulation resistance, U1For the described first positive collection voltages, U2It is adopted for first cathode
Collecting voltage, U01For the first pull-up biasing supply voltage, U3For the described second positive collection voltages, U4For second cathode
Collection voltages, U02For the second pull-up biasing supply voltage, R01For the positive pole marks in the standard bias resistance switching module
Quasi- biasing resistor, R1For the first positive divider resistance, R in the insulation data acquisition module2For the insulation data acquisition module
The second positive divider resistance, R in block4For the first cathode divider resistance, the R in the insulation data acquisition module5It is described exhausted
The second cathode divider resistance, R in edge data acquisition module3For the anode pull-up biased electrical in the insulation data acquisition module
Resistance, R6Biasing resistor, R are pulled up for the cathode in the insulation data acquisition modulei2For the cathode ground insulation resistance.
10. insulation impedance detection method according to claim 7, which is characterized in that described to be based on first pull up bias
Supply voltage, the first positive collection voltages, the first cathode collection voltages, the second pull-up biasing supply voltage, the second anode is set to adopt
Collecting voltage and the second cathode collection voltages, impedance value and the cathode for obtaining the positive ground insulation resistance in high-pressure system are exhausted over the ground
The impedance value of edge impedance, specifically includes:
When the described first positive collection voltages are less than the first cathode collection voltages, the resistance of the anode ground insulation resistance
The calculating process of anti-value is as follows:
When the described first positive collection voltages are less than the first cathode collection voltages, the resistance of the cathode ground insulation resistance
The calculating process of anti-value is as follows:
In formula, Ri1For the positive ground insulation resistance, U1For the described first positive collection voltages, U2It is adopted for first cathode
Collecting voltage, U01For the first pull-up biasing supply voltage, U3For the described second positive collection voltages, U4For second cathode
Collection voltages, U02For the second pull-up biasing supply voltage, R02For the cathode mark in the standard bias resistance switching module
Quasi- biasing resistor, R1For the first positive divider resistance, R in the insulation data acquisition module2For the insulation data acquisition module
The second positive divider resistance, R in block4For the first cathode divider resistance, the R in the insulation data acquisition module5It is described exhausted
The second cathode divider resistance, R in edge data acquisition module3For the anode pull-up biased electrical in the insulation data acquisition module
Resistance, R6Biasing resistor, R are pulled up for the cathode in the insulation data acquisition modulei2For the cathode ground insulation resistance.
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