CN111856332A - Circuit and method for detecting disconnection of shunt - Google Patents
Circuit and method for detecting disconnection of shunt Download PDFInfo
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- CN111856332A CN111856332A CN202010689073.1A CN202010689073A CN111856332A CN 111856332 A CN111856332 A CN 111856332A CN 202010689073 A CN202010689073 A CN 202010689073A CN 111856332 A CN111856332 A CN 111856332A
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- 238000000034 method Methods 0.000 title claims description 9
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000003745 diagnosis Methods 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims description 19
- 241000288673 Chiroptera Species 0.000 claims description 6
- 230000010354 integration Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- YBIDYTOJOXKBLO-USLOAXSXSA-N (4-nitrophenyl)methyl (5r,6s)-6-[(1r)-1-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate Chemical compound C([C@@H]1[C@H](C(N11)=O)[C@H](O)C)C(=O)C1C(=O)OCC1=CC=C([N+]([O-])=O)C=C1 YBIDYTOJOXKBLO-USLOAXSXSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a shunt disconnection detection circuit and a shunt disconnection detection method, and belongs to the technical field of electric vehicle battery management systems. Compared with the prior art, the invention can accurately detect the IBATS + or IBATS-disconnection faults at the two ends of the shunt, can adopt the diagnosis circuit to diagnose whether the disconnection faults exist or not when the system is powered on or the current is acquired to be 0A, provides accurate protection measures for the control of the whole vehicle, provides fault information for maintenance personnel, and avoids the problem that the whole vehicle cannot carry out current protection or calculate the battery electric quantity through ampere-hour integration due to the disconnection faults.
Description
Technical Field
The invention relates to an electric vehicle battery management system, in particular to a shunt disconnection detection circuit and a disconnection detection method.
Background
At present, a Hall current sensor or a current divider is adopted by an electric automobile to detect charging and discharging currents of a power battery, wherein the current divider is used for collecting the currents, so that the advantages of high precision and low cost are achieved, and the electric automobile is widely used.
A general current detection circuit of a current divider uses an operational amplifier to detect a differential signal at two ends of the current divider, as shown in fig. 1, IVCC _5V is an isolated 5V power supply, IGND is isolated, RX is the current divider (assuming that the measurement range is 75mV/400A), when a battery pack is charged and discharged, two ends (IBATS +, IBATS-) of the current divider RX will generate a differential signal voltage, the circuit amplifies the differential signal of the current divider by 21 times by using a low offset voltage operational amplifier MCP6N16, and then adds the amplified signal to a 2500mV voltage output by a reference TL431, and outputs a voltage Vi to an isolated ADC for collection, wherein the current calculation formula is as follows:
the shunt on the electric automobile is generally installed on a battery charge-discharge loop (close to the total negative of a battery), differential voltage at two ends of the shunt is collected, two wires IBATS + and IBATS-are required to be led out from a circuit board and connected to two ends of the shunt, the two wires are likely to have a wire break fault in a long-term use process (vibration or aging factors), and when the fault occurs, the voltage Vi is 2500mv and is converted into 0A current; since it is uncertain whether the acquired 0A is the current when the battery is not charged or discharged or the current of a disconnection fault, the control strategy of the whole vehicle is disordered, and if overcurrent detection protection cannot be performed or the battery power cannot be calculated through current ampere-hour integration, etc.
Disclosure of Invention
In order to solve the problems caused by the disconnection faults, the invention provides a disconnection detection circuit and a disconnection detection method of a current divider, which can accurately detect IBATS + or IBATS-disconnection faults and provide accurate protective measures and timely maintenance prompts for vehicle control.
The invention is realized by adopting the following technical scheme:
the invention provides a shunt disconnection detection circuit which is arranged on an IBATS + and IBATS-leading-out wire of a shunt and comprises a processor MCU, a first resistor, a second resistor, a third resistor and an optocoupler, wherein the anode of the transmitting end of the optocoupler is connected to an external non-isolated power supply through the first resistor, the cathode of the transmitting end of the optocoupler is connected to an I/O control end of the processor MCU, the anode of the receiving end of the optocoupler is connected with the external isolated power supply through the second resistor and the third resistor which are sequentially connected in series, an isolation ADC is connected between the second resistor and the third resistor, and the cathode of the receiving end of the optocoupler is connected to an IBATS + and IBATS-leading-out wire of the shunt.
As a further optimization scheme of the invention, the non-isolated power supply is a non-isolated 5V power supply, and the isolated power supply is an isolated 5V power supply.
As a further optimized solution of the present invention, the resistance of the first resistor is 680 Ω, and the resistance of the second resistor and the third resistor is 10K Ω.
As a further optimization scheme of the invention, the type of the optocoupler is TLP291GB, and the isolation withstand voltage value is 3750 Vrms.
The invention also provides a method for detecting the disconnection by using the current divider disconnection detection circuit, which comprises the following steps:
s1, respectively connecting the two shunt disconnection detection circuits to IBATS + and IBATS-end lead-out wires of the shunts, outputting high levels to the disconnection detection circuits at the IBATS-end and the BATS + end by using the MCU, detecting differential signals of the shunts IBATS + and IBATS-ends by using the current detection circuit of the shunts, and starting the next diagnosis process if the detected differential signal current is 0A;
step S2: setting diagnosis acquisition points on a connecting line of a second resistor and a third resistor of the disconnection detection circuit of the IBATS-end and the BATS + end, and acquiring diagnosis voltages V1 and V2 of the IBATS-end and the BATS + end by using an isolation ADC (analog-to-digital converter);
step S3: outputting a low level to a disconnection detection circuit at an IBATS-end by using a processor MCU, outputting a high level to a disconnection detection circuit at an IBATS + end, if detecting that V1 is lower than the isolation power supply voltage connected with the disconnection detection circuit at the IBATS-end, indicating that the connection between the circuit IBATS-and a shunt is good, and if detecting that the voltage is equal to the isolation power supply voltage connected with the disconnection detection circuit at the IBATS-end, indicating that the connection between the circuit IBATS-and the shunt is disconnected;
Step S4: and outputting a low level to the disconnection detection circuit at the IBATS + end by using the MCU, outputting a high level to the disconnection detection circuit at the IBATS-end, if the voltage V2 is detected to be lower than the isolation power supply voltage connected with the disconnection detection circuit at the IBATS + end, indicating that the connection between the circuit IBATS + and the shunt is good, and if the voltage is detected to be equal to the isolation power supply voltage connected with the disconnection detection circuit at the IBATS + end, indicating that the connection between the circuit IBATS + and the shunt is disconnected.
Compared with the prior art, the invention has the beneficial effects that: the invention can accurately detect IBATS + or IBATS-disconnection faults at two ends of the shunt, and can diagnose whether the disconnection fault exists by adopting the diagnosis circuit when the current is acquired to be 0A, thereby providing accurate current protection measures for the control of the whole vehicle, simultaneously providing fault information for maintenance personnel, and avoiding the situation that the current protection of the whole vehicle cannot be carried out or the battery electric quantity is calculated by ampere-hour integration due to the disconnection fault.
Drawings
FIG. 1 is a schematic diagram of a current sensing circuit of a conventional current divider;
fig. 2 is a schematic diagram of a current divider current detection circuit including a disconnection detection circuit.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Example 1
As shown in fig. 2, this embodiment provides a current divider current detection circuit with a disconnection detection circuit, where the current divider current detection circuit includes a low offset voltage operational amplifier MCP6N16 and a voltage regulator TL431, a power supply terminal of the low offset voltage operational amplifier MCP6N16 is connected to an isolation 5V power supply IVCC _5V, a VSS terminal is connected to an isolation ground IGND, a VIM terminal and a VIP terminal are respectively connected to IBATS-, IBATS + outgoing lines of the current divider, a VOUT terminal is connected to a voltage regulator TL431, the voltage regulator TL431 is connected to the isolation 5V power supply IVCC _5V, outputs a reference voltage of 2500mA, and outputs an output voltage Vi to the isolation ADC for collection after being superimposed with an amplified voltage output by the low offset voltage operational amplifier MCP6N 16.
The detection circuit comprises a processor MCU, first resistors R8 and R11, second resistors R9 and R13, third resistors R10 and R12 and optical couplers U2 and U3, wherein the anodes of the transmitting ends of the optical couplers U2 and U3 are respectively connected to a non-isolated 5V power supply MCU _5V through first resistors R8 and R11, the cathodes of the transmitting ends of the optical couplers U2 and U3 are connected to two I/O control ends CTL _ N, CTL _ P of the processor MCU, the anodes of the receiving ends of the optical couplers U2 and U3 are respectively connected in series through second resistors IBR 9 and R13, the third resistors R13 and R13 are connected with an isolated 5V power supply CTL _5V, the second resistors IVCC 13 and R13 are respectively connected with the third resistors R72, the third resistors R13 and the receiving ends of the optical couplers, the diagnostic circuits IBS 13 and the ADCs 13 are respectively connected to the midpoint of the receiving ends of the optical couplers, and the shunt 13, and the diagnostic circuits of the IBATS 13 and the ADC 13 are respectively connected in series, and the receiving ends of the processor MCU 13 and the diagnosis circuit, The outlet lines of IBATS-are connected.
In this embodiment, the resistances of the first resistors R8 and R11 are 680 Ω, the resistances of the second resistors R9 and R13, the resistances of the third resistors R10 and R12 are 10K Ω, and the model of the optocoupler is TLP291 GB.
The embodiment also provides a method for detecting the disconnection of the current divider based on the disconnection detection circuit of the current divider, which comprises the following steps:
s1, connecting the two shunt disconnection detection circuits to a connection line between the shunt current detection circuit and the shunt IBATS + and IBATS-ends respectively, controlling CTL _ N to output a high level by using the processor MCU, outputting a high level by using CTL _ P, detecting a differential signal of the shunt IBATS + and IBATS-ends by using the shunt current detection circuit, and starting the next diagnosis process if the differential signal current is 0A;
step S2: diagnostic acquisition points are arranged at the middle point of a connecting line of the resistors R9 and R10 and the middle point of a connecting line of the resistors R12 and R13, and diagnostic voltages V1 and V2 are acquired by using the isolated ADC;
step S3: the processor MCU is used for controlling the CTL _ N to output a low level, the CTL _ P to output a high level, the anode and the cathode of the receiving end of the optocoupler U2 are conducted, if the voltage of V1 is detected to be about 2.5V, the circuit IBATS-is well connected with the shunt, and if the voltage is detected to be 5V, the circuit IBATS-is disconnected with the shunt;
Step S4: and the processor MCU is used for controlling the CTL _ P to output a low level, the CTL _ N to output a high level, the anode and the cathode of the receiving end of the optocoupler U3 are conducted, if the voltage of V2 is detected to be about 2.5V, the circuit IBATS + is well connected with the shunt, and if the voltage is detected to be 5V, the circuit IBATS + is disconnected with the shunt.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a shunt disconnection detection circuitry, locates on IBATS +, IBATS-the lead-out wire of shunt, its characterized in that, including treater MCU, first resistance, second resistance, third resistance and opto-coupler, the transmitting terminal positive pole of opto-coupler is connected to outside non-isolation power through first resistance, and the transmitting terminal negative pole of opto-coupler is connected to treater MCU's IO control end, and the receiving terminal positive pole of opto-coupler is connected with outside isolation power through second resistance, third resistance that establish ties in proper order, is connected to between second resistance and the third resistance and keeps apart the ADC, and the receiving terminal negative pole of opto-coupler is connected to in the lead-out wire of IBATS +, IBATS-of shunt.
2. The circuit for detecting disconnection of a shunt according to claim 1, wherein the non-isolated power supply is a non-isolated 5V power supply, and the isolated power supply is an isolated 5V power supply.
3. The circuit of claim 1, wherein the first resistor has a resistance of 680 Ω, and the second resistor and the third resistor have a resistance of 10K Ω.
4. The shunt disconnection detecting circuit according to claim 1, wherein the type of the optocoupler is TLP291GB, and the isolation withstand voltage value of the optocoupler is 3750 Vrms.
5. A method of detecting a disconnection using the shunt disconnection detection circuit according to any one of claims 1 to 4, comprising the steps of:
s1, respectively connecting the two shunt disconnection detection circuits to IBATS + and IBATS-end lead-out wires of the shunts, outputting high levels to the disconnection detection circuits at the IBATS-end and the BATS + end by using the MCU, detecting differential signals of the shunts IBATS + and IBATS-ends by using the current detection circuit of the shunts, and starting the next diagnosis process if the detected differential signal current is 0A;
step S2: setting diagnosis acquisition points on a connecting line of a second resistor and a third resistor of the disconnection detection circuit of the IBATS-end and the BATS + end, and acquiring diagnosis voltages V1 and V2 of the IBATS-end and the BATS + end by using an isolation ADC (analog-to-digital converter);
Step S3: outputting a low level to a disconnection detection circuit at an IBATS-end by using a processor MCU, outputting a high level to a disconnection detection circuit at an IBATS + end, if detecting that V1 is lower than the isolation power supply voltage connected with the disconnection detection circuit at the IBATS-end, indicating that the connection between the circuit IBATS-and a shunt is good, and if detecting that the voltage is equal to the isolation power supply voltage connected with the disconnection detection circuit at the IBATS-end, indicating that the connection between the circuit IBATS-and the shunt is disconnected;
step S4: and outputting a low level to the disconnection detection circuit at the IBATS + end by using the MCU, outputting a high level to the disconnection detection circuit at the IBATS-end, if the voltage V2 is detected to be lower than the isolation power supply voltage connected with the disconnection detection circuit at the IBATS + end, indicating that the connection between the circuit IBATS + and the shunt is good, and if the voltage is detected to be equal to the isolation power supply voltage connected with the disconnection detection circuit at the IBATS + end, indicating that the connection between the circuit IBATS + and the shunt is disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010689073.1A CN111856332A (en) | 2020-07-17 | 2020-07-17 | Circuit and method for detecting disconnection of shunt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010689073.1A CN111856332A (en) | 2020-07-17 | 2020-07-17 | Circuit and method for detecting disconnection of shunt |
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| CN111856332A true CN111856332A (en) | 2020-10-30 |
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| CN202010689073.1A Pending CN111856332A (en) | 2020-07-17 | 2020-07-17 | Circuit and method for detecting disconnection of shunt |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415430A (en) * | 2020-11-04 | 2021-02-26 | 合肥力高动力科技有限公司 | Diagnosis method for disconnection and connection looseness of Hall current sensor |
| CN112858768A (en) * | 2021-01-07 | 2021-05-28 | 力高(山东)新能源技术有限公司 | Circuit and method for improving current detection precision of current divider |
| CN114236426A (en) * | 2021-12-17 | 2022-03-25 | 中国船舶重工集团公司第七一一研究所 | Switch signal cable break detector |
| CN118112328A (en) * | 2024-04-30 | 2024-05-31 | 博最科技(苏州)有限公司 | Active detection method for shunt mounting point impedance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415430A (en) * | 2020-11-04 | 2021-02-26 | 合肥力高动力科技有限公司 | Diagnosis method for disconnection and connection looseness of Hall current sensor |
| CN112415430B (en) * | 2020-11-04 | 2022-09-06 | 合肥力高动力科技有限公司 | Diagnosis method for disconnection and connection looseness of Hall current sensor |
| CN112858768A (en) * | 2021-01-07 | 2021-05-28 | 力高(山东)新能源技术有限公司 | Circuit and method for improving current detection precision of current divider |
| CN114236426A (en) * | 2021-12-17 | 2022-03-25 | 中国船舶重工集团公司第七一一研究所 | Switch signal cable break detector |
| CN114236426B (en) * | 2021-12-17 | 2023-07-28 | 中国船舶集团有限公司第七一一研究所 | Switch signal cable broken line detector |
| CN118112328A (en) * | 2024-04-30 | 2024-05-31 | 博最科技(苏州)有限公司 | Active detection method for shunt mounting point impedance |
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