CN104502712B - A kind of power system of electric automobile Insulation monitoring control device and control method - Google Patents
A kind of power system of electric automobile Insulation monitoring control device and control method Download PDFInfo
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- CN104502712B CN104502712B CN201410636701.4A CN201410636701A CN104502712B CN 104502712 B CN104502712 B CN 104502712B CN 201410636701 A CN201410636701 A CN 201410636701A CN 104502712 B CN104502712 B CN 104502712B
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Abstract
The invention discloses a kind of power system of electric automobile Insulation monitoring control device and control method, including：Insulation monitoring controller, first switch, second switch, positive pole insulation detection device, negative insulation detection means, power accumulator group positive pole connects first switch signal input part, the first switch control end connects Insulation monitoring controller control end, the first switch signal output part connects positive pole insulation detection device signal input part, and the positive pole insulation detection device signal output part connects Insulation monitoring controller signals input；Power accumulator group negative pole connects second switch signal input part, the second switch control end connects Insulation monitoring controller control end, the second switch signal output part connects negative insulation detection means signal input part, and the negative insulation detection means signal output part connects Insulation monitoring controller signals input.
Description
Technical field
The present invention relates to automation control area, more particularly to a kind of power system of electric automobile Insulation monitoring control device
And control method.
Background technology
The voltage of battery dynamical system has generally been above the safe voltage that human body can be born on current electric automobile,
And insulation ag(e)ing, the objective factor such as paddle, drench with rain can all be such that original insulaion resistance further declines, thus using or
In maintenance process, Danger Electric shock risk is brought to use, maintenance personal, therefore, a kind of vehicle-mounted real-time high-efficiency, the electricity of low cost is developed
Electrical automobile electrokinetic cell system Insulation monitoring control device just seems necessary.
The content of the invention
It is contemplated that at least solving technical problem present in prior art, a kind of electronic vapour is especially innovatively proposed
Car dynamical system Insulation monitoring control device and control method.
In order to realize the above-mentioned purpose of the present invention, the invention provides a kind of control of power system of electric automobile Insulation monitoring
Device, itself it is critical that including：Insulation monitoring controller, first switch, second switch, positive pole insulation detection device, negative pole are exhausted
Edge detection means,
Power accumulator group E1 positive poles connect first switch signal input part, the first switch control end connection insulation inspection
Controller control end is surveyed, the first switch signal output part connects positive pole insulation detection device signal input part, the positive pole
Insulation detection device signal output part connects Insulation monitoring controller signals input；
Power accumulator group E1 negative poles connect second switch signal input part, the second switch control end connection insulation inspection
Controller control end is surveyed, the second switch signal output part connects negative insulation detection means signal input part, the negative pole
Insulation detection device signal output part connects Insulation monitoring controller signals input.
Described power system of electric automobile Insulation monitoring control device, it is preferred that also include：3rd resistor and the 4th electricity
Resistance,
Described 3rd resistor one end is connected between power accumulator group E1 positive poles and first switch signal input part, described
The electric chassis of 3rd resistor other end connection electric car, described 4th resistance one end is connected to power accumulator group E1 negative poles and second
Between switch signal input end, the electric chassis of the 4th resistance other end connection electric car.
Described power system of electric automobile Insulation monitoring control device, it is preferred that the positive pole insulation detection device bag
Include：First resistor, second resistance, the first FET, the second FET, the first insulaion resistance Ro1,
First resistor one end connection first switch connection end, the first resistor other end connects second resistance one end respectively
With Insulation monitoring controller signals input, the second resistance other end connects the drain electrode of the first FET, described first
Effect tube grid connects Insulation monitoring controller control end, and the first FET source electrode connects the second FET source respectively
Pole and the electric chassis of electric car, second fet gate connect Insulation monitoring controller control end, second field-effect
First insulaion resistance Ro1 one end of pipe drain electrode connection, the first insulaion resistance Ro1 other ends connect first switch signal output
End.
Described power system of electric automobile Insulation monitoring control device, it is preferred that the negative insulation detection means bag
Include：5th resistance, the 6th resistance, the 3rd FET, the 4th FET, the second insulaion resistance Ro2,
3rd FET source electrode connects second switch signal output part, and the 3rd FET drain electrode connection second is exhausted
Edge resistance Ro2 one end, the electric chassis of the second insulaion resistance Ro2 other ends connection electric car, the second switch signal output
End is also connected with the 4th FET source electrode, and the 6th resistance one end of the 4th FET drain electrode connection, the 6th resistance is another
One end connects the 5th resistance one end and Insulation monitoring controller signals input respectively, and the 5th resistance other end is also connected with
Two insulaion resistance Ro2, the 4th fet gate connects Insulation monitoring controller signals input.
Described power system of electric automobile Insulation monitoring control device, it is preferred that also include：Battery manager BMS and
Display device,
The battery manager BMS signal input parts are connected by CAN with Insulation monitoring controller signals output end,
The battery manager BMS signal output parts connect display device, and the display device is used to show Insulation monitoring data and entered
Row alarm indication.
Invention additionally discloses a kind of power system of electric automobile Insulation monitoring control method, it is it is critical that including as follows
Step：
Step 1, by the device described in claim 1, test power accumulator group positive pole is to electric chassis voltage, so as to examine
Survey whether insulating resistance value exceedes threshold value, judge whether alarm operation；
Step 2, by the device described in claim 1, test power accumulator group negative pole is to electric chassis voltage, so as to examine
Survey whether insulating resistance value exceedes threshold value, judge whether alarm operation.
Described power system of electric automobile Insulation monitoring control method, it is preferred that the step 1 includes：
Step 1-1, the first switch control end output signal of Insulation monitoring controller connects first switch, Insulation monitoring
The first FET control end output high level signal of controller makes the first FET saturation conduction, Insulation monitoring controller
The second FET control end output low level signal make the second FET cut-off disconnection；The second of Insulation monitoring controller
Switch control terminal output signal is off second switch, passes through formula：
VR3+VR4=VE1,
VR1+VR2=VR3,
VR2=R2 × VR3 ÷ (R1+R2),
VR3 is pressure drop in 3rd resistor in above formula, and VR4 is pressure drop on the 4th resistance, and VE1 is the total voltage of batteries,
VR1 is pressure drop in first resistor, and VR2 is pressure drop in second resistance；Insulation monitoring control is sent to using the partial pressure in second resistance
After first A/D signal input parts of device processed, the pressure drop VR2 in second resistance is tested out, under the magnitude of voltage of the VR2 is substituted into
Formula is obtained
VR3=(R1+R2) × VR2 ÷ R2.
Described power system of electric automobile Insulation monitoring control method, it is preferred that the step 2 includes：
Step 2-1, the second switch control end output signal of Insulation monitoring controller connects second switch, Insulation monitoring
The 4th FET control end output high level signal of controller makes the 4th FET saturation conduction, Insulation monitoring controller
The 3rd FET control end output low level signal make the 3rd FET cut-off disconnection, the first of Insulation monitoring controller
Switch control terminal output signal is off first switch, such as following formula：
VR5+VR6=VR4,
VR4 is pressure drop on the 4th resistance in above formula, and VR5 is pressure drop on the 5th resistance, and VR6 is pressure drop on the 6th resistance, is made
It is sent to the 5th ohmically partial pressure after the 2nd A/D signal input parts of Insulation monitoring controller, the 5th ohmically pressure drop
VR5 is tested out, and the magnitude of voltage of the VR5 is substituted into VR5=R5 × VR4 ÷ (R5+R6), obtained such as following formula：
VR4=(R5+R6) × VR5 ÷ R5.
Described power system of electric automobile Insulation monitoring control method, it is preferred that the step 1 includes：
Step 1-2, Insulation monitoring controller is compared to VR3 and VR4, if VR3 ＞ VR4, illustrate 3rd resistor ＞
4th resistance, in order to test the 4th resistance, introduces the first insulaion resistance of known value；
The first switch control end output signal of Insulation monitoring controller connects first switch, Insulation monitoring controller
First FET control end output high level signal makes the first FET saturation conduction, second of Insulation monitoring controller
Effect pipe control end output high level signal makes the second FET saturation conduction；The second switch control of Insulation monitoring controller
End output signal is off second switch, and now the first insulaion resistance is in parallel with 3rd resistor, if in parallel is R31,
Equation below:
VR31=(R1+R2) × VR21÷ R2,
According to step 1-1 method of testing, VR21Also measured by Insulation monitoring controller, so as to obtain VR3 by above formula1。
Described power system of electric automobile Insulation monitoring control method, it is preferred that the step 2 includes：
Step 2-1, if VR4 ＞ VR3, illustrates the 4th resistance ＞ 3rd resistors, in order to test 3rd resistor, introduces known
Second insulaion resistance of resistance value,
The second switch control end output signal of Insulation monitoring controller connects second switch, Insulation monitoring controller
4th FET control end output high level signal makes the 4th FET saturation conduction, the 3rd of Insulation monitoring controller
Effect pipe control end output high level signal makes the 3rd FET saturation conduction；The first switch control of Insulation monitoring controller
End output signal is off first switch, now the second insulaion resistance and the 4th resistor coupled in parallel, if in parallel is R41,
Such as following formula:
VR41=(R5+R6) × VR51÷ R5,
The method of testing used according to step 2-1, VR51Measured by Insulation monitoring controller, so as to be obtained by above formula formula
VR41。
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
Because the present apparatus uses precision resistance examination survey method, simpler than using external voltage method of testing circuit, cost declines；
When needing to repair or detect using special isolation tester the insulaion resistance of vehicle, PC control can be passed through
First, second switch is off, and first, second switch can also be set into hand switch control.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is circuit theory connection figure of the invention；
Fig. 2 tries battery anode voltage equivalent circuit diagram for the 1st pacing of the present invention；
Fig. 3 tries battery electrode voltage equivalent circuit diagram for the 2nd pacing of the present invention；
Fig. 4 tries battery anode voltage equivalent circuit diagram for the 3rd pacing of the present invention；
Fig. 5 tries battery electrode voltage equivalent circuit diagram for the 4th pacing of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer " is based on accompanying drawing institutes
The orientation or position relationship shown, is for only for ease of the description present invention and simplifies description, rather than indicate or imply signified dress
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the limit of the present invention
System.
In the description of the invention, unless otherwise prescribed with limit, it is necessary to explanation, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanically connect or electrical connection or the connection of two element internals, can
To be to be joined directly together, it can also be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
It is an object of the invention to provide a kind of electric automobile power battery system Insulation monitoring control device, the device is in car
Detection electrokinetic cell system E1 positive pole, the insulaion resistance of negative pole respectively to electric chassis (car body) in real time in traveling and charging,
When the secondary insulation resistance value that the insulating resistance value ＜ measured allows (500 Ω/V), the present apparatus is first by CAN two
Class B insulation Resistance Fault passes to battery manager BMS, and battery manager BMS control display instruments carry out secondary insulation resistance light
Flicker alarm, points out vehicle driver；When the one-level insulating resistance value that the insulating resistance value ＜ measured allows (100 Ω/V),
One-level insulaion resistance failure is being passed to battery manager BMS by the present apparatus by CAN, and battery manager BMS controls are aobvious
While showing that instrument carries out the alarm of one-level insulaion resistance optical flare, then pass through battery manager BMS control electrokinetic cell systems
The power motor of positive and negative electrode and vehicle disconnects, to ensure the insulation safety of personnel and vehicle.
In Fig. 1, first switch, second switch are relay, and the first switch, second switch effect are to solve
Vehicle insulation system is repaired or detected using other special isolation testers and is set, usually first switch, second
Switch as normally closed on-state, E1 is power accumulator group, Q1, Q2, Q3, Q4 are N-type FET, resistance R1+R2=resistance
R5+R6 >=10M Ω, R2=R5=1%R1, R1=R6, resistance R1, R2, R5, R6 are the precision resistance of known value, Ro1
=Ro2 is that the precision resistance of the known value according to 500 Ω/V configurations is (such as dynamic by the nominal voltage calculating of power accumulator
During nominal voltage=320V of power battery, Ro1=500 × 320=160K Ω.), resistance R3 and R4 are respectively power accumulator
Group positive and negative electrode is appointed to the insulaion resistance on electric chassis, generally finite resistive value, and the two is general also unequal in R3 or R4
One exceedes permissible value, and as system insulation exceedes permissible value, i.e., a small resistance value is the insulating resistance value of system, system
Alarmed and controlled by setup program.
In use, testing respectively insulaion resistance R3 and R4 as follows：
1st step, test batteries positive pole is to electric chassis voltage VR3：
The first switch control end A4 output signals of Insulation monitoring controller connect first switch, Insulation monitoring controller
The first FET control end A2 output high level signal make the first FET Q1 saturation conductions, Insulation monitoring controller
Second FET control end A3 output low level signals make the second FET Q2 cut-off disconnections；The of Insulation monitoring controller
Two switch control terminal A5 output signals are off second switch, conducting resistance during due to FET saturation conduction
For tens milliohm magnitudes, tens Milliohm resistance does not influence on test circuit, equivalent to short circuit, now has equivalent circuit such as
Fig. 2, is had by Fig. 2:
VR3+VR4=VE1 (1)
VR1+VR2=VR3 (2)
VR2=R2 × VR3 ÷ (R1+R2) (3)
VR3 is pressure drop on insulaion resistance R3 in above-mentioned (1), (2), (3) formula, and VR4 is pressure drop on insulaion resistance R4, and VE1 is
The total voltage of batteries, VR1 is pressure drop on precision resistance R1, and VR2 is pressure drop on precision resistance R2；Because R1 and R2 is precision
Known resistance, after Fig. 2 is sent to the first A/D signal input parts A1 of Insulation monitoring controller using the partial pressure on lower R2, electricity
The pressure drop VR2 hindered on R2 is tested out, and the magnitude of voltage of the VR2 is substituted into (3) formula, obtained
VR3=(R1+R2) × VR2 ÷ R2 (4)
2nd step, test batteries negative pole is to electric chassis voltage VR4：
The second switch control end A5 output signals of Insulation monitoring controller connect second switch, Insulation monitoring controller
The 4th FET control end A8 output high level signal make the 4th FET Q1 saturation conductions, Insulation monitoring controller
3rd FET control end A6 output low level signals make the 3rd FET Q3 cut-off disconnections, the of Insulation monitoring controller
One switch control terminal A4 output signals are off first switch；Now there is equivalent circuit such as Fig. 3, had by Fig. 3:
VR5+VR6=VR4 (5)
VR5=R5 × VR4 ÷ (R5+R6) (6)
(5) VR4 is pressure drop on insulaion resistance R4 in formula, and VR5 is pressure drop on precision resistance R5, and VR6 is on precision resistance R6
Pressure drop；Because R5 and R6 is accurate known resistance, the second of Insulation monitoring controller is sent to using the partial pressure on lower R5 in Fig. 3
After A/D signal input parts A7, the pressure drop VR5 on resistance R5 is tested out (negative pressure can carry out absolute value processing), by the VR5
Magnitude of voltage substitute into (6) formula, obtain
VR4=(R5+R6) × VR5 ÷ R5 (7)
3rd step, Insulation monitoring controller is compared to VR3 and VR4, if VR3 ＞ VR4, illustrates insulaion resistance R3 ＞
R4 (leakage current for flowing through R3 and R4 is equal), system insulating resistance is determined by R4, in order to test R4, introduces known value
Precision resistance Ro1.
The first switch control end A4 output signals of Insulation monitoring controller connect first switch, Insulation monitoring controller
The first FET control end A2 output high level signal make the first FET Q1 saturation conductions, Insulation monitoring controller
Second FET control end A3 output high level signals make the second FET Q2 saturation conductions；The of Insulation monitoring controller
Two switch control terminal A5 output signals are off second switch, now have equivalent circuit such as Fig. 4, now Ro1 and R3
Parallel connection, if in parallel is R31, had by Fig. 4:
VR31=(R1+R2) × VR21÷R2 (8)
The method of testing used according to the 1st step, VR21It can also be measured by Insulation monitoring controller, so as to be obtained by (8) formula
To VR31。
4th step, if VR4 ＞ VR3, illustrates insulaion resistance R4 ＞ R3, system insulating resistance is determined by R3, in order to test
R3, introduces the precision resistance Ro2 of known value.
The second switch control end A5 output signals of Insulation monitoring controller connect second switch, Insulation monitoring controller
The 4th FET control end A8 output high level signal make the 4th FET Q4 saturation conductions, Insulation monitoring controller
3rd FET control end A6 output high level signals make the 3rd FET Q3 saturation conductions；The of Insulation monitoring controller
One switch control terminal A4 output signals are off first switch, now have equivalent circuit such as Fig. 5, now Ro2 and R4
Parallel connection, if in parallel is R41, had by Fig. 5:
VR41=(R5+R6) × VR51÷R5 (9)
The method of testing used according to the 2nd step, VR51It can also be measured by Insulation monitoring controller, so as to be obtained by (9) formula
To VR41。
The present apparatus can be obtained by above-mentioned (1) formula to (9) formula and detect that the result of power accumulator group system insulating resistance is：
As VR3 ＞ VR4,
Insulaion resistance R4=(VR3-VR31)×Ro1×(1+VR4÷VR3)÷VR31
As VR4 ＞ VR3,
Insulaion resistance R3=(VR4-VR41)×Ro2×(1+VR3÷VR4)÷VR41
The present apparatus according to measuring after insulaion resistance judged alarm and control accordingly.
The Insulation monitoring controller can be realized using 89C51 and A/D converter and peripheral circuit, or use electricity
Pond management system (BMS).
Because the present apparatus uses precision resistance examination survey method, simpler than using external voltage method of testing circuit, cost declines；
When needing to repair or detect using special isolation tester the insulaion resistance of vehicle, PC control can be passed through
First, second switch is off, and first, second switch can also be set into hand switch control.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (5)
1. a kind of power system of electric automobile Insulation monitoring control device, it is characterised in that including：Insulation monitoring controller,
One switch, second switch, positive pole insulation detection device, negative insulation detection means,
Power accumulator group (E1) positive pole connects first switch signal input part, and the first switch control end connects Insulation monitoring
Controller control end, the first switch signal output part connects positive pole insulation detection device signal input part, and the positive pole is exhausted
Edge detection means signal output part connects Insulation monitoring controller signals input；
Power accumulator group (E1) negative pole connects second switch signal input part, and the second switch control end connects Insulation monitoring
Controller control end, the second switch signal output part connects negative insulation detection means signal input part, and the negative pole is exhausted
Edge detection means signal output part connects Insulation monitoring controller signals input；
The power system of electric automobile Insulation monitoring control device comprises the following steps：
Step 1, by described power system of electric automobile Insulation monitoring control device, test power accumulator group positive pole is to electricity
Chassis voltage, so as to detect whether insulating resistance value exceedes threshold value, judges whether alarm operation；
Step 1-1, the first switch control end output signal of Insulation monitoring controller connects first switch, Insulation monitoring control
The first FET control end output high level signal of device makes the first FET saturation conduction, and the of Insulation monitoring controller
Two FET control ends output low level signal makes the cut-off disconnection of the second FET；The second switch of Insulation monitoring controller
Control end output signal is off second switch, passes through formula：
VR3+VR4=VE1,
VR1+VR2=VR3,
VR2=R2 × VR3 ÷ (R1+R2),
VR3 is pressure drop in 3rd resistor in above formula, and VR4 is pressure drop on the 4th resistance, and VE1 is the total voltage of batteries, and VR1 is
Pressure drop in first resistor, VR2 is pressure drop in second resistance；Insulation monitoring controller is sent to using the partial pressure in second resistance
After first A/D signal input parts, the pressure drop VR2 in second resistance is tested out, and the magnitude of voltage of the VR2 is substituted into following formula obtains
Arrive,
VR3=(R1+R2) × VR2 ÷ R2；
Step 1-2, Insulation monitoring controller is compared to VR3 and VR4, if VR3 ＞ VR4, illustrate 3rd resistor ＞ the 4th
Resistance, in order to test the 4th resistance, introduces the first insulaion resistance of known value；
The first switch control end output signal of Insulation monitoring controller connects first switch, and the first of Insulation monitoring controller
FET control end output high level signal makes the first FET saturation conduction, the second field-effect of Insulation monitoring controller
Pipe control end output high level signal makes the second FET saturation conduction；The second switch control end of Insulation monitoring controller is defeated
Going out signal is off second switch, and now the first insulaion resistance is in parallel with 3rd resistor, if in parallel is R31, it is as follows
Formula：
VR31=(R1+R2) × VR21÷ R2,
According to step 1-1 method of testing, VR21Also measured by Insulation monitoring controller, so as to obtain VR3 by above formula1；
Step 2, described power system of electric automobile Insulation monitoring control device, test power accumulator group negative pole is to electric chassis
Voltage, so as to detect whether insulating resistance value exceedes threshold value, judges whether alarm operation；
Step 2-1, the second switch control end output signal of Insulation monitoring controller connects second switch, Insulation monitoring control
The 4th FET control end output high level signal of device makes the 4th FET saturation conduction, and the of Insulation monitoring controller
Three FET control ends output low level signal makes the cut-off disconnection of the 3rd FET, and the first of Insulation monitoring controller opens
Closing control end output signal is off first switch, such as following formula：
VR5+VR6=VR4,
VR4 is pressure drop on the 4th resistance in above formula, and VR5 is pressure drop on the 5th resistance, and VR6 is pressure drop on the 6th resistance, uses the
Five ohmically partial pressures are sent to after the 2nd A/D signal input parts of Insulation monitoring controller, the 5th ohmically pressure drop VR5 quilts
Test out, the magnitude of voltage of the VR5 is substituted into VR5=R5 × VR4 ÷ (R5+R6), obtained such as following formula：
VR4=(R5+R6) × VR5 ÷ R5；
Step 2-2, if VR4 ＞ VR3, illustrates the 4th resistance ＞ 3rd resistors, in order to test 3rd resistor, introduces known resistance
Second insulaion resistance of value,
The second switch control end output signal of Insulation monitoring controller connects second switch, and the 4th of Insulation monitoring controller the
FET control end output high level signal makes the 4th FET saturation conduction, the 3rd field-effect of Insulation monitoring controller
Pipe control end output high level signal makes the 3rd FET saturation conduction；The first switch control end of Insulation monitoring controller is defeated
Going out signal is off first switch, now the second insulaion resistance and the 4th resistor coupled in parallel, if in parallel is R41, it is as follows
Formula：
VR41=(R5+R6) × VR51÷ R5,
The method of testing used according to step 2-1, VR51Measured by Insulation monitoring controller, so as to obtain VR4 by above formula1。
2. power system of electric automobile Insulation monitoring control device according to claim 1, it is characterised in that also include：
3rd resistor and the 4th resistance,
Described 3rd resistor one end is connected between power accumulator group (E1) positive pole and first switch signal input part, and described
The electric chassis of three resistance other ends connection electric car, described 4th resistance one end is connected to power accumulator group (E1) negative pole and second
Between switch signal input end, the electric chassis of the 4th resistance other end connection electric car.
3. power system of electric automobile Insulation monitoring control device according to claim 1, it is characterised in that the positive pole
Insulation detection device includes：First resistor, second resistance, the first FET, the second FET, the first insulaion resistance
(Ro1),
First resistor one end connection first switch connection end, the first resistor other end connects second resistance one end and exhausted respectively
Edge detects controller signals input, and the second resistance other end connects the drain electrode of the first FET, first field-effect
Tube grid connect Insulation monitoring controller control end, the first FET source electrode connect respectively the second FET source electrode and
Electric car electricity chassis, second fet gate connects Insulation monitoring controller control end, the second FET leakage
Pole connects the first insulaion resistance (Ro1) one end, and the first insulaion resistance (Ro1) other end connects first switch signal output
End.
4. power system of electric automobile Insulation monitoring control device according to claim 1, it is characterised in that the negative pole
Insulation detection device includes：5th resistance, the 6th resistance, the 3rd FET, the 4th FET, the second insulaion resistance
(Ro2),
3rd FET source electrode connects second switch signal output part, the 3rd FET drain electrode second insulated electro of connection
Hinder (Ro2) one end, the electric chassis of the second insulaion resistance (Ro2) other end connection electric car, the second switch signal output
End is also connected with the 4th FET source electrode, and the 6th resistance one end of the 4th FET drain electrode connection, the 6th resistance is another
One end connects the 5th resistance one end and Insulation monitoring controller signals input respectively, and the 5th resistance other end is also connected with
Two insulaion resistances (Ro2), the 4th fet gate connects Insulation monitoring controller signals input.
5. power system of electric automobile Insulation monitoring control device according to claim 1, it is characterised in that also include：
Battery manager (BMS) and display device,
Battery manager (BMS) signal input part is connected by CAN with Insulation monitoring controller signals output end, institute
Battery manager (BMS) signal output part connection display device is stated, the display device is used to show Insulation monitoring data and entered
Row alarm indication.
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| CN105589044A (en) * | 2015-12-09 | 2016-05-18 | 天津市捷威动力工业有限公司 | Automatic test system and test method for testing function of power battery pack |
| CN106324462B (en) * | 2016-08-17 | 2020-04-28 | 重庆长安新能源汽车科技有限公司 | Insulation detection method and circuit and new energy automobile |
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