CN206892190U - A kind of DC insulation monitoring instrument - Google Patents
A kind of DC insulation monitoring instrument Download PDFInfo
- Publication number
- CN206892190U CN206892190U CN201720825952.6U CN201720825952U CN206892190U CN 206892190 U CN206892190 U CN 206892190U CN 201720825952 U CN201720825952 U CN 201720825952U CN 206892190 U CN206892190 U CN 206892190U
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- Prior art keywords
- module
- monitoring instrument
- resistance value
- microcontroller
- insulation
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a kind of DC insulation monitoring instrument, insulation resistance value module, selftest module, CAN interface and CAN are calculated including non-equilibrium bridge sample circuit module, sampled signal processing module, Analog-digital Converter sampling module, microcontroller, sampled signal processing module includes multi-way detecting switch, isolation amplifier module, difference amplifier module and microcontroller D/A converter module.The utility model switchs to obtain the different conditions of non-equilibrium bridge by switching non-equilibrium bridge sample circuit, voltage is measured, obtains the positive and negative electrode insulaion resistance, while send insulation resistance value that insulate to vehicle body, realize fault alarm, the DC insulation monitoring instrument sampling precision is high, and the sampling period is short, and calculating speed is fast, fault alarm delay is small, and implementation method is simple, cost is low, applied widely.
Description
Technical field
A kind of monitor is the utility model is related to, more particularly to a kind of DC insulation monitoring instrument, belongs to dc source prison
Survey technology field.
Background technology
Insulation instrument is that the insulation resistance value of DC power anode and negative pole to vehicle body ground is measured on pure electric vehicle, it is intended to is monitored pure
The drain conditions of electric car, its major function are accurately to measure vehicle high-voltage positive electrode resistance to earth and high voltage negative resistance to earth,
Class of insulation fault alarm is made, and alarm is sent to vehicle processing, is advantageous to carry out phase to the serious conditions of vehicle electric leakage
The troubleshooting answered, dc bus are a parameter for being difficult to measure to the insulation resistance value on vehicle body ground, and conventional insulator monitor is examined
Surveying result has larger error, so can not accurately draw insulating resistance value, be unfavorable for early detection and the investigation of failure.
Utility model content
Main purpose of the present utility model is to provide for a kind of DC insulation monitoring instrument, for improving DC power anode
The measurement accuracy of insulation against ground resistance and negative pole insulation against ground resistance, improve insulaion resistance sample rate and breakdown judge speed.
The purpose of this utility model can reach by using following technical scheme：
A kind of DC insulation monitoring instrument, including non-equilibrium bridge sample circuit module, sampled signal processing module, simulation numeral
Change sampling module, microcontroller calculates insulation resistance value module, CAN interface and CAN；The non-equilibrium bridge sample circuit mould
Block electrically connects with the sampled signal processing module, the sampled signal processing module and the Analog-digital Converter sampling module
Electrical connection, the Analog-digital Converter sampling module calculate insulation resistance value module with the microcontroller and electrically connected, the micro-control
Device processed calculates insulation resistance value module and electrically connected with the CAN interface, and the CAN interface electrically connects with the CAN, described
CAN electrically connects with fault processing module；The non-equilibrium bridge sample circuit module access DC power anode, dc source
Negative pole and vehicle body earth signal, the non-equilibrium bridge sample circuit module, which is used to sample, obtains sampling resistor R3 voltage signal, institute
State sampling resistor R3 and sequentially enter the Analog-digital Converter sampling module and institute after sampled signal processing module amplification
State microcontroller calculating insulation resistance value resume module and positive and negative insulation resistance value is calculated, the positive and negative insulation resistance value passes through described
CAN interface and the CAN send the signal to fault processing module, and the fault processing module carries out troubleshooting.
Preferable scheme is that non-equilibrium bridge is provided with the non-equilibrium bridge sample circuit module, on the non-equilibrium bridge
Optical coupled switch K1 and optical coupled switch K2 models are AQY216EHA, the resistance R2 on the non-equilibrium bridge and resistance R3 resistance
Matched according to required measurement voltage.
As being preferably for any of the above-described scheme, the sampled signal processing module includes multi-way detecting switch, isolation fortune
Amplification module, difference amplifier module and microcontroller D/A converter module, the multi-way detecting switch and the isolation amplifier module
Electrical connection, the isolation amplifier module electrically connect with the difference amplifier module, the difference amplifier module and the microcontroller
Device D/A converter module electrically connects.
As being preferably for any of the above-described scheme, the sampled signal processing module collection divider resistance voltage signal passes through
Multi-way detecting switch switches to the isolation amplifier module, and send after the difference amplifier module differential amplification to
The microcontroller D/A converter module, the microcontroller D/A converter module are retransmited to A D interface.
As being preferably for any of the above-described scheme, the A D interface uses 12 ADC interfaces.
As being preferably for any of the above-described scheme, the ADC datums of the ADC interface use ADR5044BRTZ chips
Carry out voltage stabilizing.
As being preferably for any of the above-described scheme, the microcontroller calculates insulation resistance value module by simultaneously switching off optocoupler
K1 and optical coupled switch K2 is switched to measure DC power anode to cathode voltage UAC；The microcontroller calculates insulation resistance value mould
Block is by closing optical coupled switch K1, disconnecting optical coupled switch K2 with measuring vehicle body to total negative voltage UBC1 of battery；The micro-control
Device processed calculates insulation resistance value module by closing optical coupled switch K2, disconnecting optical coupled switch K1 with measuring vehicle body to the total negative of battery
Voltage UBC2.
As being preferably for any of the above-described scheme, the CAN interface is CAN communication interface.
As being preferably for any of the above-described scheme, the DC insulation monitoring instrument also includes selftest module, the self-test mould
Block is used to detect the modules in the DC insulation monitoring instrument.
Advantageous effects of the present utility model：According to DC insulation monitoring instrument of the present utility model, the utility model carries
The DC insulation monitoring instrument of confession, switch to obtain the different conditions of non-equilibrium bridge, measurement electricity by switching non-equilibrium bridge sample circuit
Pressure, the positive and negative electrode insulaion resistance, while send insulation resistance value that insulate is obtained to vehicle body, realizes fault alarm, D.C. isolation prison
It is high to survey instrument sampling precision, the sampling period is short, and calculating speed is fast, and fault alarm delay is small, and implementation method is simple, and cost is low, fits
It is wide with scope.
Brief description of the drawings
Fig. 1 is the structure according to the insulating monitor of a preferred embodiment of DC insulation monitoring instrument of the present utility model
Figure；
Fig. 2 is the non-equilibrium bridge sample circuit mould according to a preferred embodiment of DC insulation monitoring instrument of the present utility model
Block circuit diagram, the embodiment can be and Fig. 1 identicals embodiment or the embodiment different with Fig. 1；
Fig. 3 is the sampled signal processing module knot according to a preferred embodiment of DC insulation monitoring instrument of the present utility model
Composition, the embodiment can be and Fig. 1 or Fig. 2 identicals embodiment or the embodiment different with Fig. 1 or Fig. 2.
In figure：The non-equilibrium bridge sample circuit modules of 1-, 2- sampled signal processing modules, 3- Analog-digital Converters sampling mould
Block, 4- microcontrollers calculate insulation resistance value module, 5-CAN interfaces, 6-CAN buses, 21- multi-way detectings switch, 22- isolation amplifiers
Module, 23- difference amplifier modules, 24- microcontroller D/A converter modules.
Embodiment
To make those skilled in the art more clear and clear and definite the technical solution of the utility model, with reference to embodiment and
Accompanying drawing is described in further detail to the utility model, but embodiment not limited to this of the present utility model.
As shown in figure 1, a kind of DC insulation monitoring instrument that the present embodiment provides, including non-equilibrium bridge sample circuit module 1,
Sampled signal processing module 2, Analog-digital Converter sampling module 3, microcontroller calculate insulation resistance value module 4, the and of CAN interface 5
CAN 6；The non-equilibrium bridge sample circuit module 1 electrically connects with the sampled signal processing module 2, the sampled signal
Processing module 2 electrically connects with the Analog-digital Converter sampling module 3, the Analog-digital Converter sampling module 3 with it is described micro-
Controller calculates insulation resistance value module 4 and electrically connected, and the microcontroller calculates insulation resistance value module 4 and is electrically connected with the CAN interface 5
Connect, the CAN interface 5 electrically connects with the CAN 6, and the CAN 6 electrically connects with fault processing module；It is described non-flat
The bridge sample circuit module 1 that weighs accesses DC power anode, DC power cathode and vehicle body earth signal, the non-equilibrium bridge sampling electricity
Road module 1, which is used to sample, obtains sampling resistor R3 voltage signal, and the sampling resistor R3 is through the sampled signal processing module 2
The Analog-digital Converter sampling module 3 is sequentially entered after amplification and the microcontroller calculates insulation resistance value module 4 and handles meter
Calculation draws positive and negative insulation resistance value, and the positive and negative insulation resistance value is sent the signal to by the CAN interface 5 and the CAN 6
Fault processing module, the fault processing module carry out troubleshooting.
Further, in the present embodiment, as shown in Fig. 2 being provided with the non-equilibrium bridge sample circuit module 1 non-equilibrium
Bridge, optical coupled switch K1 and optical coupled switch K2 models on the non-equilibrium bridge are AQY216EHA, the electricity on the non-equilibrium bridge
The resistance for hindering R2 and resistance R3 measures voltage to match needed for.
Further, in the present embodiment, as shown in figure 3, the sampled signal processing module 2 switchs including multi-way detecting
21st, isolation amplifier module 22, difference amplifier module 23 and microcontroller D/A converter module 24, multi-way detecting switch 21 with
The isolation amplifier module 22 electrically connects, and the isolation amplifier module 22 electrically connects with the difference amplifier module 23, the difference
Partite transport amplification module 23 electrically connects with the microcontroller D/A converter module 24, and the sampled signal processing module 2 gathers partial pressure
Resistive voltage signal switches to the isolation amplifier module 22 by multi-way detecting switch 21, and passes through the difference amplifier
Sent after the differential amplification of module 23 to the microcontroller D/A converter module 24, the microcontroller D/A converter module 24 is again
Send to A D interface, the A D interface uses 12 ADC interfaces, and the ADC datums of the ADC interface use
ADR5044BRTZ chips carry out voltage stabilizing.
Further, in the present embodiment, the microcontroller calculates insulation resistance value module 4 and opened by simultaneously switching off optocoupler
K1 and optical coupled switch K2 is closed to measure DC power anode to cathode voltage UAC；The microcontroller calculates insulation resistance value module 4
By closing optical coupled switch K1, disconnecting optical coupled switch K2 with measuring vehicle body to total negative voltage UBC1 of battery；The microcontroller
Device calculates insulation resistance value module 4 by closing optical coupled switch K2, disconnecting optical coupled switch K1 with measuring vehicle body to the total negative of battery
Voltage UBC2.
Further, in the present embodiment, the CAN interface 5 is CAN communication interface, and the DC insulation monitoring instrument is also
Including selftest module, the selftest module is used to detect the modules in the DC insulation monitoring instrument.
Further, in the present embodiment, it is described non-equilibrium by switching to calculate insulation resistance value module 4 for the microcontroller
Switch in bridge sample circuit module 1 obtains sampling resistor voltage, be calculated respectively DC power anode to cathode voltage and
Different on off state under bodies to cathode voltage, calculate positive pole insulation against ground resistance and negative pole insulation against ground after establishing formula
Resistance.
In summary, in the present embodiment, the direct current provided according to the DC insulation monitoring instrument of the present embodiment, the present embodiment
Insulating monitor, switch to obtain the different conditions of non-equilibrium bridge by switching non-equilibrium bridge sample circuit, measure voltage, obtain absolutely
Edge positive and negative electrode insulaion resistance, while send insulation resistance value, realizes fault alarm to vehicle body, DC insulation monitoring instrument sampling
Precision is high, and measurement insulaion resistance precision improves 3%, and the sampling period is short, and calculating speed is fast, and fault alarm delay is small, and realizes
Method is simple, and cost is low, applied widely.
It is described above, only the utility model further embodiment, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art is in scope disclosed in the utility model, according to of the present utility model
Technical scheme and its design are subject to equivalent substitution or change, belong to the scope of protection of the utility model.
Claims (9)
1. a kind of DC insulation monitoring instrument, including non-equilibrium bridge sample circuit module (1), sampled signal processing module (2), simulation
Numeral conversion sampling module (3), microcontroller calculate insulation resistance value module (4), CAN interface (5) and CAN (6)；Its feature
It is：The non-equilibrium bridge sample circuit module (1) electrically connects with the sampled signal processing module (2), the sampled signal
Processing module (2) electrically connects with the Analog-digital Converter sampling module (3), the Analog-digital Converter sampling module (3) with
The microcontroller calculates insulation resistance value module (4) electrical connection, the microcontroller calculate insulation resistance value module (4) with it is described
CAN interface (5) electrically connects, and the CAN interface (5) electrically connects with the CAN (6), at the CAN (6) and failure
Manage module electrical connection；Non-equilibrium bridge sample circuit module (1) access DC power anode, DC power cathode and the vehicle body
Signal, the non-equilibrium bridge sample circuit module (1), which is used to sample, obtains sampling resistor R3 voltage signal, the sampling resistor
R3 sequentially enters the Analog-digital Converter sampling module (3) and described micro- after the sampled signal processing module (2) is amplified
Controller calculates insulation resistance value module (4) processing and positive and negative insulation resistance value is calculated, and the positive and negative insulation resistance value passes through the CAN
Interface (5) and the CAN (6) send the signal to fault processing module, and the fault processing module carries out troubleshooting.
A kind of 2. DC insulation monitoring instrument according to claim 1, it is characterised in that：The non-equilibrium bridge sample circuit mould
It is provided with non-equilibrium bridge in block (1), the optical coupled switch K1 and optical coupled switch K2 models on the non-equilibrium bridge are AQY216EHA,
The resistance of resistance R2 and resistance R3 on the non-equilibrium bridge measures voltage to match needed for.
A kind of 3. DC insulation monitoring instrument according to claim 1, it is characterised in that：The sampled signal processing module
(2) multi-way detecting switch (21), isolation amplifier module (22), difference amplifier module (23) and microcontroller digital-to-analogue conversion mould are included
Block (24), the multi-way detecting switch (21) electrically connect with the isolation amplifier module (22), the isolation amplifier module (22)
Electrically connected with the difference amplifier module (23), the difference amplifier module (23) and the microcontroller D/A converter module
(24) electrically connect.
A kind of 4. DC insulation monitoring instrument according to claim 3, it is characterised in that：The sampled signal processing module
(2) gather divider resistance voltage signal and switch to the isolation amplifier module (22) by multi-way detecting switch (21), and
Sent after difference amplifier module (23) differential amplification to the microcontroller D/A converter module (24), the micro-control
Device D/A converter module (24) processed is retransmited to A D interface.
A kind of 5. DC insulation monitoring instrument according to claim 4, it is characterised in that：The A D interface uses 12 ADC
Interface.
A kind of 6. DC insulation monitoring instrument according to claim 5, it is characterised in that：The ADC of the ADC interface is with reference to electricity
It is flat that voltage stabilizing is carried out using ADR5044BRTZ chips.
A kind of 7. DC insulation monitoring instrument according to claim 1, it is characterised in that：The microcontroller calculates insulation resistance
Value module (4) measures DC power anode to cathode voltage UAC by simultaneously switching off optical coupled switch K1 and optical coupled switch K2；Institute
State microcontroller and calculate insulation resistance value module (4) by closing optical coupled switch K1, disconnecting optical coupled switch K2 with measuring vehicle body pair
Total negative voltage UBC1 of battery；The microcontroller calculates insulation resistance value module (4) by closing optical coupled switch K2, disconnecting optocoupler
K1 is switched with measuring vehicle body to total negative voltage UBC2 of battery.
A kind of 8. DC insulation monitoring instrument according to claim 1, it is characterised in that：The CAN interface (5) is led to for CAN
Communication interface.
A kind of 9. DC insulation monitoring instrument according to claim 1, it is characterised in that：The DC insulation monitoring instrument also wraps
Selftest module is included, the selftest module is used to detect the modules in the DC insulation monitoring instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720825952.6U CN206892190U (en) | 2017-07-10 | 2017-07-10 | A kind of DC insulation monitoring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720825952.6U CN206892190U (en) | 2017-07-10 | 2017-07-10 | A kind of DC insulation monitoring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206892190U true CN206892190U (en) | 2018-01-16 |
Family
ID=61296738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720825952.6U Expired - Fee Related CN206892190U (en) | 2017-07-10 | 2017-07-10 | A kind of DC insulation monitoring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206892190U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540226A (en) * | 2020-11-12 | 2021-03-23 | 北京北交新能科技有限公司 | Unbalanced bridge insulation resistance detection circuit for rail transit and calculation method |
| CN112578186A (en) * | 2020-12-21 | 2021-03-30 | 山东积成智通新能源有限公司 | Direct-current insulation detection system and device and balance bridge measurement method |
| CN113281621A (en) * | 2021-01-26 | 2021-08-20 | 镇江赛尔尼柯自动化有限公司 | Ship equipment fault diagnosis device based on offline insulation monitoring and use method |
-
2017
- 2017-07-10 CN CN201720825952.6U patent/CN206892190U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540226A (en) * | 2020-11-12 | 2021-03-23 | 北京北交新能科技有限公司 | Unbalanced bridge insulation resistance detection circuit for rail transit and calculation method |
| CN112578186A (en) * | 2020-12-21 | 2021-03-30 | 山东积成智通新能源有限公司 | Direct-current insulation detection system and device and balance bridge measurement method |
| CN113281621A (en) * | 2021-01-26 | 2021-08-20 | 镇江赛尔尼柯自动化有限公司 | Ship equipment fault diagnosis device based on offline insulation monitoring and use method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180116 Termination date: 20210710 |
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| CF01 | Termination of patent right due to non-payment of annual fee |