CN107576900B - A kind of electric car full voltage platform Insulation Inspection System - Google Patents
A kind of electric car full voltage platform Insulation Inspection System Download PDFInfo
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- CN107576900B CN107576900B CN201710949007.1A CN201710949007A CN107576900B CN 107576900 B CN107576900 B CN 107576900B CN 201710949007 A CN201710949007 A CN 201710949007A CN 107576900 B CN107576900 B CN 107576900B
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Abstract
The invention belongs to electric vehicle engineering fields, more particularly to a kind of electric car full voltage platform Insulation Inspection System, including insulation monitoring module and with master controller MCU, the insulation monitoring module includes the voltage sensor of output end access master controller MCU, further includes being connected in voltage sensor measuring circuit, by the programmable gain amplifier unit of master controller MCU control gain.This 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 range of Insulation monitoring, it can be adapted for the full voltage detection of electric car, the production and management for greatly facilitating electric car, reduce cost.
Description
Technical field
The invention belongs to electric vehicle engineering fields, and in particular to a kind of electric car full voltage platform Insulation monitoring system
System.
Background technique
Electric car is a complicated electrical system, and electrical system divides low-pressure section and high-pressure section, low-pressure section
For the car low-voltage electrical power supply such as electronic equipment, light, rain brush, speaker, generally powered using 12V/24V, low-voltage power supply is born
Pole is connected directly with vehicle chassis；High-pressure section is dynamical system (electric machine controller, the conversion of vehicle-mounted DCDC power supply of vehicle
Device etc.) power supply, the power battery operating voltage of riding electric vehicle high voltage system is generally in 300V or so.The high pressure of electric car
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
Etc. factors influence all lead to decreasing insulating between high-voltage electric system and vehicle chassis, positive pole or negative wire
To increase vehicle chassis current potential, influence low-voltage electrical and motor control by constituting loop of electric leakage between insulating layer and chassis
The normal work of device, the personal safety of crisis driver and passenger.
The Insulation monitoring of electric car at present is generally measured using GB/T18384.1 paraller resistanc method, the GB/
For the circuit framework of T18384.1 paraller resistanc method as shown in Figure 1, Rp is bus anode Leaked Current of Line to Ground resistance value, Rn is bus cathode pair
Floor drain resistance value, Ra and Rb are auxiliary resistances, and R=Ra+Rb is of the fixed resistance value of bus positive and negative electrode Leaked Current of Line to Ground resistance value
With resistance, SW1 is bus anode build-out resistor control switch, and SW2 is bus cathode build-out resistor control switch, and U is that voltage is flat
The voltage value of platform, build-out resistor the voltage Up, VM2 that VM1 is used to measure bus anode Leaked Current of Line to Ground resistance value are negative for measuring bus
The derivation process of build-out resistor the voltage Un, Rp and Rn of pole Leaked Current of Line to Ground resistance value are as follows, wherein RP//R represent RP it is in parallel with R when
Resistance value, RN//R represents resistance value of the RN with R when in parallel.
When switch SW1 and switch SW2 are closed at, the build-out resistor voltage of bus anode Leaked Current of Line to Ground resistance value is arrived in test
Build-out resistor voltage for Up1, test to cathode Leaked Current of Line to Ground resistance value is Un1, then meets:
When switch SW1 closure and switch SW2 are disconnected, the build-out resistor voltage of bus anode Leaked Current of Line to Ground resistance value is arrived in test
For Up2, then meet:
When SW2 closure and SW1 are disconnected: the build-out resistor voltage of test to cathode Leaked Current of Line to Ground resistance value 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 the voltage levels of measured battery are very big on the influence of the Measurement Resolution of insulation resistance,
In the case that Ra and Rb is fixed, the voltage of measured battery is higher, and insulation resistance resolution ratio is higher, and the voltage of measured battery is got over
Low insulation resistance resolution ratio is lower, since electric powered motor battery voltage platform span is big, from 72v to 800v, and this method
Corresponding insulating detection equipment cannot be general, needs to modify the value of Ra and Rb to adapt to different voltage platforms, it has not been convenient to produce
And management.
Summary of the invention
The present invention provides a kind of electric car full voltage platform insulation for defect and deficiency existing for existing detection device
Detection system, the insulation detecting method described in GB/T18384.1 are improved, and unit is increased, to low-voltage platform
Signal amplifies, and different voltage platforms switches different gains by MCU, effectively raises from -22dB to 20dB absolutely
The measurement accuracy and voltage adaptation range of edge detection can be adapted for the full voltage detection of electric car, greatly facilitate electricity
The production and management of electrical automobile.
The technical solution adopted by the invention is as follows:
A kind of electric car full voltage platform Insulation Inspection System, including insulation monitoring module and with master controller MCU,
The insulation monitoring module includes the voltage sensor of output end access master controller MCU, further includes being connected to voltage sensor
In device measuring circuit, by the programmable gain amplifier unit of master controller MCU control gain.
Further, the gain of the programmable gain amplifier unit is by master controller MCU according to electric car voltage
Platform voltage value carries out control setting, and electric car voltage platform voltage value is low, the high gain of programmable gain amplifier unit；
Electric car voltage platform voltage value is high, and the gain of programmable gain amplifier unit is low.
Further, the voltage sensor include be respectively used to electric car 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 anode, output end connection first voltage sensor anode first unit, with together it is mutually defeated
Enter to hold connecting electric automobile DC bus cathode, output end connection first voltage sensor anode second unit, described first
Unit connects master controller MCU with the gain control module of second unit.
Further, the first unit and second unit have eight kinds of gain modes, and gain is from -22dB to 20dB, step
Into 6dB.
Further, the system also includes the communication module of connection controller and controller both-way communication, the communications
Module passes through CAN bus and master controller MCU communication connection.
Further, the system also includes the alarm modules of connection controller.
This system can pass through communication if detecting the presence of danger of hazardous electrical discharges to electric car progress Insulation monitoring room
Module 3 and/or alarm module 4 are alarmed.
Equipped with the build-out resistor accessed between electric car DC bus positive and negative electrode and electric chassis in the main control of this system
Resistance value 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 as minimum, the build-out resistor circuit that will be respectively connected between electric car DC bus positive and negative electrode and electric chassis
It is closed, the high-speed AD converter in master controller MCU converts the voltage at the build-out resistor both ends measured at this time, and
Electric car voltage platform virtual voltage is calculated in conjunction with the resistance value of build-out resistor and yield value at this time, it is then calculated
The gain of the size switching programmable gain amplifier unit of voltage platform voltage value, it then follows be that electric car voltage platform is real
Border voltage value is low, the high gain of programmable gain amplifier unit；Electric car voltage platform actual voltage value is high, may be programmed and increases
The gain of beneficial amplifier unit is low.After handoff gain, the insulation resistance detection under specific voltage platform is carried out.Pass through main control
The switching of programmable gain amplifier module gain when device MCU is realized for different voltages platform improves the Insulation monitoring mould
The practicability of block, so that the system can satisfy the detection of full voltage platform, meanwhile, do not need the matching electricity that different resistance values are set
Resistance, improves convenience, the measurement accuracy of Insulation monitoring and voltage adaptation range, can be adapted for the full voltage inspection of electric car
It surveys, greatly facilitates the production and management of electric car, reduce cost.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.
Fig. 1 is prior art circuits structural diagrams of the invention；
Fig. 2 is schematic structural view of the invention；
Fig. 3 is specific embodiment of the invention structural schematic diagram.
Specific embodiment
A kind of electric car full voltage platform Insulation Inspection System as shown in Figure 2, including insulation monitoring module 2 and and
Master controller MCU1, the insulation monitoring module 2 include the voltage sensor of output end access master controller MCU, further include
It is connected in voltage sensor measuring circuit, by the programmable gain amplifier unit of master controller MCU control gain.
The gain of the programmable gain amplifier unit is by master controller MCU according to electric car voltage platform voltage value
Control setting is carried out, electric car voltage platform voltage value is low, the high gain of programmable gain amplifier unit；Electric car electricity
Flattening bench voltage value is high, and the gain of programmable gain amplifier unit is low.
The voltage sensor includes being respectively used to voltage measurement between electric car DC bus positive and negative electrode and electric chassis
First voltage sensor and second voltage sensor, the programmable gain amplifier unit include non-inverting input terminal connection electricity
The first unit that electrical automobile DC bus anode, output end connect first voltage sensor anode connects electricity with non-inverting input terminal
The second unit of electrical automobile DC bus cathode, output end connection first voltage sensor anode, the first unit and second
The gain control module of unit connects master controller MCU.
The first unit 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
It is described logical the system also includes the communication module 3 of connection master controller MCU and master controller MCU both-way communication
It interrogates module 3 and passes through CAN bus and master controller.
The system also includes the alarm modules of connection controller.
This system can pass through communication if detecting the presence of danger of hazardous electrical discharges to electric car progress Insulation monitoring room
Module 3 and/or alarm module 4 are alarmed, as shown in Figure 3.
Equipped with the build-out resistor accessed between electric car DC bus positive and negative electrode and electric chassis in the main control of this system
Resistance value 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 as minimum, the build-out resistor circuit that will be respectively connected between electric car DC bus positive and negative electrode and electric chassis
It is closed, the high-speed AD converter in master controller MCU converts the voltage at the build-out resistor both ends measured at this time, and
Electric car voltage platform virtual voltage is calculated in conjunction with the resistance value volume yield value at this time of build-out resistor, it is then calculated
The gain of the size switching programmable gain amplifier unit of voltage platform voltage value, it then follows be that electric car voltage platform is real
Border voltage value is low, the high gain of programmable gain amplifier unit；Electric car voltage platform actual voltage value is high, may be programmed and increases
The gain of beneficial amplifier unit is low.After handoff gain, the insulation resistance detection under specific voltage platform is carried out.Pass through main control
The switching of programmable gain amplifier module gain when device MCU is realized for different voltages platform improves the Insulation monitoring mould
The practicability of block, so that the system can satisfy the detection of full voltage platform, meanwhile, do not need the matching electricity that different resistance values are set
Resistance, improves convenience, the measurement accuracy of Insulation monitoring and voltage adaptation range, can be adapted for the full voltage inspection of electric car
It surveys, greatly facilitates the production and management of electric car, reduce cost.
In specific implementation process, the gain of programmable gain amplifier unit is first set as minimum by master controller MCU, will be female
Line anode build-out resistor control switch SW1 and bus cathode build-out resistor control switch SW2 are closed at, and obtain Up1 and Up2,
High-speed AD converter in master controller MCU converts the voltage at the build-out resistor both ends measured at this time, and combination
The yield value of resistance value volume at this time with resistance calculates electric car voltage platform virtual voltage U, then calculated voltage
The gain of the size switching programmable gain amplifier unit of platform voltage value U, it then follows be that electric car voltage platform is practical
Voltage value is low, the high gain of programmable gain amplifier unit；Electric car 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 chip, there is eight kinds of increasings
Beneficial mode, from -22dB to 20dB, stepping 6dB is shown in Table 1 for gain；Next closure SW1 disconnects SW2 and obtains Up2；SW1 is disconnected to close
It closes SW2 and obtains Un2, by obtaining positive and negative anodes electric leakage resistance value with following formula:
After master controller MCU calculates positive and negative busbar leak resistance, warning circuit itself that reported by CAN bus or pass through
It alarms.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of electric car full voltage platform Insulation Inspection System, including insulation monitoring module and with master controller MCU, institute
The insulation monitoring module stated includes the voltage sensor of output end access master controller MCU, it is characterised in that: further includes being connected to
In voltage sensor measuring circuit, by the programmable gain amplifier unit of master controller MCU control gain, in main control MCU
Equipped with the build-out resistor resistance value storage module and high speed analog-digital conversion accessed between electric car DC bus positive and negative electrode and electric chassis
Converter.
2. electric car full voltage platform Insulation Inspection System according to claim 1, it is characterised in that: described programmable
The gain of gain amplifier unit carries out control setting according to electric car voltage platform voltage value by master controller MCU, electronic
Automotive voltage platform voltage is worth low, the high gain of programmable gain amplifier unit；Electric car voltage platform voltage value is high, can
The gain for programming gain amplifier unit is low.
3. any one of -2 electric car full voltage platform Insulation Inspection System according to claim 1, it is characterised in that: described
Voltage sensor includes the first voltage biography for being respectively used to voltage measurement between electric car DC bus positive and negative electrode and electric chassis
Sensor and second voltage sensor, the programmable gain amplifier unit include that non-inverting input terminal connecting electric automobile direct current is female
Line anode, the first unit of output end connection first voltage sensor anode and non-inverting input terminal connecting electric automobile direct current are female
The second unit of line cathode, output end connection first voltage sensor anode, the gain control of the first unit and second unit
Molding block connects master controller MCU.
4. electric car full voltage platform Insulation Inspection System according to claim 3, it is characterised in that: the first unit
There are eight kinds of gain modes with second unit, gain is from -22dB to 20dB, stepping 6dB.
5. -2 described in any item electric car full voltage platform Insulation Inspection Systems according to claim 1, it is characterised in that: also
Communication module including connecting controller and controller both-way communication.
6. -2 described in any item electric car full voltage platform Insulation Inspection Systems according to claim 1, it is characterised in that: also
Alarm module including connecting controller.
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| CN2017103149793 | 2017-05-07 | ||
| CN201710314979 | 2017-05-07 |
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| CN107576900B true CN107576900B (en) | 2019-08-23 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568366B (en) * | 2018-06-05 | 2022-02-11 | 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 |
| CN112198368B (en) * | 2020-09-22 | 2022-09-09 | 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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