CN107576900A - A kind of electric automobile full voltage platform Insulation Inspection System - Google Patents
A kind of electric automobile full voltage platform Insulation Inspection System Download PDFInfo
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- CN107576900A CN107576900A CN201710949007.1A CN201710949007A CN107576900A CN 107576900 A CN107576900 A CN 107576900A CN 201710949007 A CN201710949007 A CN 201710949007A CN 107576900 A CN107576900 A CN 107576900A
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Abstract
The invention belongs to electric vehicle engineering field, more particularly to a kind of electric automobile full voltage platform Insulation Inspection System, including insulation monitoring module and with master controller MCU, described insulation monitoring module includes output end access master controller MCU voltage sensor, in addition to is connected in voltage sensor measuring circuit, the programmable gain amplifier unit by master controller MCU control gains.The system can switch different gains by master controller MCU in different voltage platforms, from 22dB to 20dB, the signal of low-voltage platform is amplified, effectively raise the measurement accuracy and voltage adaptation scope of Insulation monitoring, go for the full voltage detection of electric automobile, the production and management of electric automobile are greatly facilitated, reduces cost.
Description
Technical field
The invention belongs to electric vehicle engineering field, and in particular to a kind of electric automobile full voltage platform Insulation monitoring system
System.
Background technology
Electric automobile is a complicated electrical system, and its electrical system divides low-pressure section and high-pressure section, low-pressure section
For the in-car low-voltage electrical power supply such as electronic equipment, light, rain brush, audio amplifier, typically powered using 12V/24V, low-voltage power supply is born
Pole is joined directly together with vehicle chassis；High-pressure section is dynamical system (electric machine controller, the vehicle-mounted DCDC Power converts of vehicle
Device etc.) power supply, the electrokinetic cell operating voltage of riding electric vehicle high voltage system is typically in 300V or so.The high pressure of electric automobile
It is not electrically connected directly between electric system and chassis, cable insulation media ages of direct-current high-voltage system or by wet environment
Influence all cause the decreasing insulating between high-voltage electric system and vehicle chassis etc. factor, positive source or negative wire
Vehicle chassis current potential will be made to increase, influence low-voltage electrical and motor control by forming loop of electric leakage between insulating barrier and chassis
The normal work of device, the personal safety of crisis driver and crew.
The Insulation monitoring of electric automobile at present, typically measured using GB/T18384.1 paraller resistanc methods, the GB/
For the circuit framework of T18384.1 paraller resistanc methods as shown in figure 1, Rp is bus positive pole Leaked Current of Line to Ground resistance, Rn is bus negative pole pair
Floor drain resistance value, Ra and Rb are auxiliary resistances, R=Ra+Rb, are of the fixed resistance value of bus positive and negative electrode Leaked Current of Line to Ground resistance
With resistance, SW1 is bus positive pole build-out resistor controlling switch, and SW2 is bus negative pole build-out resistor controlling switch, and U is that voltage is put down
The magnitude of voltage of platform, build-out resistor the voltage Up, VM2 that VM1 is used to measure bus positive pole Leaked Current of Line to Ground resistance are born for measuring bus
Build-out resistor the voltage Un, Rp and Rn of pole Leaked Current of Line to Ground resistance derivation are as follows, wherein RP//R represent RP it is in parallel with R when
Resistance value, RN//R represents resistance values of the RN with R when in parallel.
When switching SW1 and switch SW2 is closed at, the build-out resistor voltage of test to bus positive pole Leaked Current of Line to Ground resistance
For Up1, the build-out resistor voltage of test to negative pole Leaked Current of Line to Ground resistance is Un1, then meets：
When switching SW1 closures and switch SW2 disconnects, the build-out resistor voltage of test to bus positive pole Leaked Current of Line to Ground resistance
For Up2, then meet：
When SW2 closures and SW1 disconnect：The build-out resistor voltage for testing negative pole Leaked Current of Line to Ground resistance is Un2, then full
Foot：
The 1 of simultaneous above formula and 2 ask Rn as follows
The 1 of simultaneous above formula and 3 ask Rp as follows
The shortcomings that this method is that Measurement Resolution influence of the voltage levels of measured battery on insulaion resistance is very big,
In the case that Ra and Rb is fixed, the higher insulaion resistance resolution ratio of voltage of measured battery is higher, and the voltage of measured battery is got over
Low insulation resistance resolution ratio is lower, because electric powered motor storage battery flattening bench span is big, from 72v to 800v, and this method
Corresponding insulating detection equipment can not be general, it is necessary to change Ra and Rb value to adapt to different voltage platforms, it has not been convenient to produces
And management.
The content of the invention
The defects of present invention exists for existing detection device and deficiency, there is provided a kind of electric automobile full voltage platform insulation
Detecting system, the insulation detecting method described in GB/T18384.1 is improved, adds unit, to low-voltage platform
Signal is amplified, and different voltage platforms switches different gains by MCU, is effectively raised from -22dB to 20dB absolutely
The measurement accuracy and voltage adaptation scope of edge detection, go for the full voltage detection of electric automobile, greatly facilitate electricity
The production and management of electrical automobile.
The technical solution adopted by the present invention is as follows：
A kind of electric automobile full voltage platform Insulation Inspection System, including insulation monitoring module and with master controller MCU,
Described insulation monitoring module includes output end access master controller MCU voltage sensor, in addition to is connected to voltage sensor
The programmable gain amplifier unit of gain is controlled in device measuring circuit, by master controller MCU.
Further, the gain of the programmable gain amplifier unit by master controller MCU according to electric automobile voltage
Platform voltage value is controlled setting, and electric automobile voltage platform magnitude of voltage is low, the high gain of programmable gain amplifier unit；
Electric automobile voltage platform magnitude of voltage is high, and the gain of programmable gain amplifier unit is low.
Further, the voltage sensor include being respectively used to electric automobile dc bus positive and negative electrode and electric chassis it
Between voltage measurement first voltage sensor and second voltage sensor, the programmable gain amplifier unit includes with mutually defeated
Enter to hold connecting electric automobile dc bus positive pole, the first module of output end connection first voltage sensor positive pole, and with mutually defeated
Enter to hold connecting electric automobile dc bus negative pole, output end connection first voltage sensor positive pole second unit, described first
Unit connects master controller MCU with the gain control module of second unit.
Further, the first module and second unit have eight kinds of gain modes, and gain is from -22dB to 20dB, step
Enter 6dB.
Further, the system also includes the communication module of connection controller and controller both-way communication, the communication
Module passes through CAN and master controller MCU communication connections.
Further, the system also includes the alarm module of connection controller.
The system is carrying out Insulation monitoring room to electric automobile, if detecting the presence of danger of hazardous electrical discharges, can pass through communication
Module 3 and/or alarm module 4 are alarmed.
The build-out resistor accessed between electric automobile dc bus positive and negative electrode and electric chassis is provided with the main control of the system
Resistance storage module and high-speed AD converter, when in use, master controller MCU is first by programmable gain amplifier list
The gain of member is set to minimum, the build-out resistor circuit that will be respectively connected between electric automobile dc bus positive and negative electrode and electric chassis
Closing, the high-speed AD converter in master controller MCU is changed the voltage at the build-out resistor both ends now measured, and
Electric automobile voltage platform virtual voltage is calculated with reference to the resistance of build-out resistor and yield value now, is then calculated
Voltage platform magnitude of voltage size switching programmable gain amplifier unit gain, it then follows be electric automobile voltage platform reality
Border magnitude of voltage is low, the high gain of programmable gain amplifier unit；Electric automobile voltage platform actual voltage value is high, may be programmed and increases
The gain of beneficial amplifier unit is low.After handoff gain, the insulaion resistance detection under specific voltage platform is carried out.Pass through main control
Device MCU realizes that the switching of programmable gain amplifier module gain when being directed to different voltage platforms improves the Insulation monitoring mould
The practicality of block so that the system can meet the detection of full voltage platform, simultaneously, it is not necessary to which the matching electricity of different resistances is set
Resistance, improves convenience, the measurement accuracy of Insulation monitoring and voltage adaptation scope, goes for the full voltage inspection of electric automobile
Survey, greatly facilitate the production and management of electric automobile, reduce cost.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.
Fig. 1 is the prior art circuits structural diagrams of the present invention；
Fig. 2 is schematic structural view of the invention；
Fig. 3 is specific embodiment of the invention structural representation.
Embodiment
A kind of electric automobile full voltage platform Insulation Inspection System as shown in Figure 2, including insulation monitoring module 2 and and
Master controller MCU1, described insulation monitoring module 2 include output end access master controller MCU voltage sensor, in addition to
It is connected in voltage sensor measuring circuit, the programmable gain amplifier unit by master controller MCU control gains.
The gain of the programmable gain amplifier unit is by master controller MCU according to electric automobile voltage platform magnitude of voltage
Setting is controlled, electric automobile voltage platform magnitude of voltage is low, the high gain of programmable gain amplifier unit；Electric automobile electricity
Flattening bench magnitude of voltage is high, and the gain of programmable gain amplifier unit is low.
The voltage sensor includes being respectively used to voltage measurement between electric automobile dc bus positive and negative electrode and electric chassis
First voltage sensor and second voltage sensor, the programmable gain amplifier unit include in-phase input end connection electricity
The first module of electrical automobile dc bus positive pole, output end connection first voltage sensor positive pole, electricity is connected with in-phase input end
The second unit of electrical automobile dc bus negative pole, output end connection first voltage sensor positive pole, the first module and second
The gain control module connection master controller MCU of unit.
The first module and second unit have eight kinds of gain modes, and gain is from -22dB to 20dB, stepping 6dB, gain
Concrete condition see the table below 1；
Table 1：The gain of the programmable-gain unit
The system also includes the communication module 3 of connection master controller MCU and master controller MCU both-way communications, described logical
News module 3 passes through CAN and master controller.
The system also includes the alarm module of connection controller.
The system is carrying out Insulation monitoring room to electric automobile, if detecting the presence of danger of hazardous electrical discharges, can pass through communication
Module 3 and/or alarm module 4 are alarmed, as shown in Figure 3.
The build-out resistor accessed between electric automobile dc bus positive and negative electrode and electric chassis is provided with the main control of the system
Resistance storage module and high-speed AD converter, when in use, master controller MCU is first by programmable gain amplifier list
The gain of member is set to minimum, the build-out resistor circuit that will be respectively connected between electric automobile dc bus positive and negative electrode and electric chassis
Closing, the high-speed AD converter in master controller MCU is changed the voltage at the build-out resistor both ends now measured, and
Electric automobile voltage platform virtual voltage is calculated with reference to the resistance volume yield value now of build-out resistor, is then calculated
Voltage platform magnitude of voltage size switching programmable gain amplifier unit gain, it then follows be electric automobile voltage platform reality
Border magnitude of voltage is low, the high gain of programmable gain amplifier unit；Electric automobile voltage platform actual voltage value is high, may be programmed and increases
The gain of beneficial amplifier unit is low.After handoff gain, the insulaion resistance detection under specific voltage platform is carried out.Pass through main control
Device MCU realizes that the switching of programmable gain amplifier module gain when being directed to different voltage platforms improves the Insulation monitoring mould
The practicality of block so that the system can meet the detection of full voltage platform, simultaneously, it is not necessary to which the matching electricity of different resistances is set
Resistance, improves convenience, the measurement accuracy of Insulation monitoring and voltage adaptation scope, goes for the full voltage inspection of electric automobile
Survey, greatly facilitate the production and management of electric automobile, reduce cost.
In specific implementation process, the gain of programmable gain amplifier unit is first set to minimum by master controller MCU, by mother
Line positive pole build-out resistor controlling switch SW1 and bus negative pole build-out resistor controlling switch SW2 are closed at, and obtain Up1 and Up2,
High-speed AD converter in master controller MCU is changed the voltage at the build-out resistor both ends now measured, and combination
The yield value of resistance volume now with resistance calculates electric automobile voltage platform virtual voltage U, the voltage then calculated
Platform voltage value U size switching programmable gain amplifier unit gain, it then follows be electric automobile voltage platform reality
Magnitude of voltage is low, the high gain of programmable gain amplifier unit；Electric automobile voltage platform actual voltage value is high, programmable-gain
The gain of amplifier unit is low, and the programmable gain amplifier unit uses THS7001 programmable control chips, there is eight kinds of increasings
Beneficial mode, gain stepping 6dB, are shown in Table 1 from -22dB to 20dB；Next closure SW1 disconnections SW2 obtains Up2；SW1 is disconnected to close
Close SW2 and obtain Un2, by obtaining both positive and negative polarity electric leakage resistance with below equation：
After master controller MCU calculates positive and negative busbar leak resistance, warning circuit itself that reported by CAN or pass through
Alarmed.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (6)
1. a kind of electric automobile full voltage platform Insulation Inspection System, including insulation monitoring module and with master controller MCU, institute
The insulation monitoring module stated includes output end access master controller MCU voltage sensor, it is characterised in that：Also include being connected to
The programmable gain amplifier unit of gain is controlled in voltage sensor measuring circuit, by master controller MCU.
2. electric automobile full voltage platform Insulation Inspection System according to claim 1, it is characterised in that：It is described programmable
The gain of gain amplifier unit is controlled setting by master controller MCU according to electric automobile voltage platform magnitude of voltage, electronic
Automotive voltage platform voltage is worth low, the high gain of programmable gain amplifier unit；Electric automobile voltage platform magnitude of voltage is high, can
The gain for programming gain amplifier unit is low.
3. according to any one of the claim 1-2 electric automobile full voltage platform Insulation Inspection Systems, it is characterised in that：It is described
The first voltage that voltage sensor includes being respectively used to voltage measurement between electric automobile dc bus positive and negative electrode and electric chassis passes
Sensor and second voltage sensor, it is female that the programmable gain amplifier unit includes in-phase input end connecting electric automobile direct current
The first module of line positive pole, output end connection first voltage sensor positive pole, and in-phase input end connecting electric automobile direct current are female
The gain control of the second unit of line negative pole, output end connection first voltage sensor positive pole, the first module and second unit
Molding block connection master controller MCU.
4. electric automobile full voltage platform Insulation Inspection System according to claim 3, it is characterised in that：The first module
There are eight kinds of gain modes with second unit, gain is from -22dB to 20dB, stepping 6dB.
5. the electric automobile full voltage platform Insulation Inspection System according to claim any one of 1-2, it is characterised in that：Also
Communication module including connection controller and controller both-way communication.
6. the electric automobile full voltage platform Insulation Inspection System according to claim any one of 1-2, it is characterised in that：Also
Alarm module including connecting controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710314979 | 2017-05-07 | ||
| CN2017103149793 | 2017-05-07 |
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| CN107576900A true CN107576900A (en) | 2018-01-12 |
| CN107576900B CN107576900B (en) | 2019-08-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568366A (en) * | 2018-06-05 | 2019-12-13 | 广州小鹏汽车科技有限公司 | Insulation circuit, battery pack leakage detection method and hardware detection method |
| CN110707386A (en) * | 2019-11-20 | 2020-01-17 | 桑顿新能源科技有限公司 | Battery pack, detection method and detection device for electric leakage position point of battery pack and vehicle |
| CN112198368A (en) * | 2020-09-22 | 2021-01-08 | 合肥国轩高科动力能源有限公司 | Electric automobile insulation resistance detection circuit and method |
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| CN112198368A (en) * | 2020-09-22 | 2021-01-08 | 合肥国轩高科动力能源有限公司 | Electric automobile insulation resistance detection circuit and method |
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| Publication number | Publication date |
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| CN107576900B (en) | 2019-08-23 |
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