CN113899951A - Insulation sampling circuit, measurement method and system thereof and measurement device - Google Patents
Insulation sampling circuit, measurement method and system thereof and measurement device Download PDFInfo
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- CN113899951A CN113899951A CN202111153562.6A CN202111153562A CN113899951A CN 113899951 A CN113899951 A CN 113899951A CN 202111153562 A CN202111153562 A CN 202111153562A CN 113899951 A CN113899951 A CN 113899951A
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- 238000009413 insulation Methods 0.000 title claims abstract description 76
- 238000005070 sampling Methods 0.000 title claims abstract description 55
- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 238000000691 measurement method Methods 0.000 title claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims description 31
- 238000010168 coupling process Methods 0.000 claims description 31
- 238000005859 coupling reaction Methods 0.000 claims description 31
- 238000004364 calculation method Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000007726 management method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The invention provides an insulation sampling circuit, a measurement method and a system thereof and a measurement device, wherein the insulation sampling circuit comprises a measured power supply, a first measurement resistor R1, a second measurement resistor R2 and a third measurement resistor R3, the resistance values of the first measurement resistor R1 and the second measurement resistor R2 are equal, the first measurement resistor R1 is connected in parallel with an anode insulation resistor Rp of the measured power supply, the second measurement resistor R2 is connected in parallel with a cathode insulation resistor Rn of the measured power supply, the third measurement resistor R3 is connected in parallel with the first measurement resistor R1 or the second measurement resistor R2, and a first optical coupler switch S1 is connected in series on the third measurement resistor R3. The invention reduces the voltage difference between the anode and the cathode insulation by connecting the anode and the cathode insulation resistance in parallel with the other resistance, thereby simplifying the sampling process. The whole sampling process carries out 2 times of sampling, and the insulation resistance value can be immediately calculated once every time 1 time of sampling, so that the period of insulation sampling is shortened.
Description
Technical Field
The invention relates to the field of battery insulation resistance testing, in particular to an insulation sampling circuit, a measurement method and a measurement system thereof and a measurement device.
Background
With the development of new energy automobiles, the safety requirement of batteries is increasingly prominent, and insulation is an important factor in the safety management of the batteries. Traditional insulation sampling all adopts national standard electric bridge method, but traditional electric bridge method possess certain limitation, for example the condition of judging is more, and the circuit has positive negative pole opto-coupler and all breaks off, only closes anodal opto-coupler, only closes negative pole opto-coupler, and this 4 kinds of conditions of positive negative pole opto-coupler all closed. During the period, the voltage sampling and data storage need 10 data at most, including 4 total voltages, 2 positive voltages, 2 negative voltages and 2 over-voltage difference marks. The process is complicated.
Chinese patent publication No. CN109596888A discloses an insulation resistance detection method, a detection circuit, and a battery management system for an automotive battery, the insulation resistance detection method including: acquiring the voltage of the negative terminal insulation resistor acquired by the sampling circuit, the prestored high-voltage bus voltage of the battery pack and the resistance value of the sampling circuit; when the voltage value of the negative terminal insulation resistor is larger than a preset voltage value, calculating according to the voltage of the high-voltage bus of the battery pack, the voltage of the negative terminal insulation resistor and the resistance value of the sampling circuit to obtain the resistance value of the positive terminal insulation resistor and the resistance value of the negative terminal insulation resistor; and when the voltage value of the negative terminal insulation resistor is larger than zero and smaller than or equal to a preset voltage value, calculating to obtain the resistance value of the negative terminal insulation resistor according to the voltage of the high-voltage bus of the battery pack, the voltage of the negative terminal insulation resistor, the resistance value of the sampling circuit and the preset resistance value of the positive terminal insulation resistor.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide an insulated sampling circuit, a measurement method and a measurement system thereof and a measurement device.
The insulation sampling circuit provided by the invention comprises a tested power supply, a first measuring resistor R1, a second measuring resistor R2 and a third measuring resistor R3, wherein the resistance values of the first measuring resistor R1 and the second measuring resistor R2 are equal, the first measuring resistor R1 is connected in parallel with an anode insulation resistor Rp of the tested power supply, the second measuring resistor R2 is connected in parallel with a cathode insulation resistor Rn of the tested power supply, the third measuring resistor R3 is connected in parallel with the first measuring resistor R1 or connected in parallel with a second measuring resistor R2, and a first optical coupling switch S1 is connected in series with the third measuring resistor R3.
Preferably, a second optical coupler switch S2 is connected in series to the first measuring resistor, and a third optical coupler switch S3 is connected in series to the second measuring resistor.
The invention provides an insulation measuring method, which comprises the following steps:
step S1: arranging a circuit diagram, and closing a first optical coupling switch S1, a second optical coupling switch S2 and a third optical coupling switch S3;
step S2: after waiting for a preset time, sampling the positive and negative voltages of the power supply to be detected to obtain a positive voltage Up1 and a negative voltage Un 1;
step S3: disconnecting the first optocoupler switch S1, and after waiting for a preset time, sampling the positive and negative voltages of the power supply to be tested to obtain a positive voltage Up2 and a negative voltage Un 2;
step S4: and calculating the anode insulation resistance and the cathode insulation resistance of the tested power supply according to the Up1, the Un1, the Up2 and the Un2 obtained by sampling.
Preferably, the calculation formula in step S4 is as follows:
preferably, in the step S1, before the circuit is arranged, the first optical coupling switch S1, the second optical coupling switch S2 and the third optical coupling switch S3 are opened, and after the circuit is arranged, the first optical coupling switch S1, the second optical coupling switch S2 and the third optical coupling switch S3 are closed.
The invention provides an insulation measuring system, which comprises the following modules:
module M1: arranging a circuit diagram, and closing a first optical coupling switch S1, a second optical coupling switch S2 and a third optical coupling switch S3;
module M2: after waiting for a preset time, sampling the positive and negative voltages of the power supply to be detected to obtain a positive voltage Up1 and a negative voltage Un 1;
module M3: disconnecting the first optocoupler switch S1, and after waiting for a preset time, sampling the positive and negative voltages of the power supply to be tested to obtain a positive voltage Up2 and a negative voltage Un 2;
module M4: and calculating the anode insulation resistance and the cathode insulation resistance of the tested power supply according to the Up1, the Un1, the Up2 and the Un2 obtained by sampling.
Preferably, the calculation formula in the module M4 is as follows:
preferably, in the module M1, before the circuit is arranged, the first optical coupler switch S1, the second optical coupler switch S2 and the third optical coupler switch S3 are opened, and after the circuit is arranged, the first optical coupler switch S1, the second optical coupler switch S2 and the third optical coupler switch S3 are closed.
The invention provides a battery insulation measuring device which comprises the insulation sampling circuit.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention reduces the voltage difference between the anode and the cathode insulation by connecting the anode and the cathode insulation resistance in parallel with the other resistance, thereby simplifying the sampling process.
2. When the resistance is measured, only the on-off of the optical coupler at one side of the power supply needs to be controlled, and only 1 optical coupler is used in the whole circuit, so that the purpose of reducing the number of the optical couplers in hardware and saving the cost is achieved; if the optical coupler control is added to the resistors connected in parallel at the two ends of the anode and the cathode, 3 optical couplers are needed to be used in the whole circuit.
3. The whole sampling process carries out 2 times of sampling, and the insulation resistance value can be immediately calculated once every time 1 time of sampling, so that the period of insulation sampling is shortened.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a diagram of a first insulation sampling circuit according to an embodiment of the present invention;
FIG. 2 is a diagram of a second insulation sampling circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of an insulation sampling method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention discloses an insulation sampling circuit which comprises a tested power supply, a first measuring resistor R1, a second measuring resistor R2 and a third measuring resistor R3, wherein the resistance values of the first measuring resistor R1 and the second measuring resistor R2 are equal, the first measuring resistor R1 is connected with a positive pole insulation resistor Rp of the tested power supply in parallel, the second measuring resistor R2 is connected with a negative pole insulation resistor Rn of the tested power supply in parallel, the third measuring resistor R3 is connected with the first measuring resistor R1 in parallel or connected with a second measuring resistor R2 in parallel, a first optical coupling switch S1 is connected with the third measuring resistor R3 in series, a second optical coupling switch S2 is connected with the first measuring resistor in series, and a third optical coupling switch S3 is connected with the second measuring resistor in series.
The steps of measuring the insulation resistance are as follows:
step S1: before arranging a circuit, disconnecting a first optical coupling switch S1, a second optical coupling switch S2 and a third optical coupling switch S3, arranging a circuit diagram, and closing the first optical coupling switch S1, the second optical coupling switch S2 and the third optical coupling switch S3;
step S2: after waiting for a preset time, sampling the positive and negative voltages of the power supply to be detected to obtain a positive voltage Up1 and a negative voltage Un 1;
step S3: disconnecting the first optocoupler switch S1, and after waiting for a preset time, sampling the positive and negative voltages of the power supply to be tested to obtain a positive voltage Up2 and a negative voltage Un 2;
step S4: and calculating the positive insulation resistance and the negative insulation resistance of the tested power supply according to the Up1, the Un1, the Up2 and the Un2 obtained by sampling, wherein the calculation formula is as follows:
adopts positive and negative insulation and respectively connects in parallel a larger resistor R1And R2The voltage difference of voltage sampling at two ends of the insulation caused by overlarge resistance value difference at two ends is reduced.
For example: when R isp＝20M ohm,Rn＝10K ohm,R1＝R2＝6M ohm，R3When 16M ohm
The traditional bridge method is used when the maximum pressure difference between the anode and the cathode is
Multiple times
When the method is used, the maximum pressure difference between the anode and the cathode is
Multiple times
In conclusion, the method can effectively reduce the pressure difference.
An isolated sampling circuit introduced in this document is based on ohm's law
I.e. the currents at the positive and negative terminals of the battery are equal. The circuit has only 2 cases in the whole sampling process, and only 4 data are used. Closing the positive optical coupler, and performing insulation sampling on the positive and negative voltages to obtain 2 data Up1,Un1. Disconnecting the positive optical coupler, and performing insulation sampling on the positive and negative voltages to obtain two outer 2 data Up2，Un2. The logic is simpler for 4 data processing. Every 2 values are collected, the calculation of the insulation value is carried out by combining the last collected value, the calculation time of the insulation value is shortened to half of the original calculation time, and the method is more efficient and safer.
The following is further illustrated with reference to specific examples.
Practical test case 1: negative insulation resistance RnIs 100K ohm, the anode insulation resistance RpIs 20M ohm, the total pressure of the power supply is 800V, R1＝6M ohm，R2＝6M ohm，R3＝16M ohm。
1. Closed positive pole optocoupler S1。
2. And after waiting for the rated time, sampling the anode and cathode voltages. Obtain the positive voltage Up1778.6V, negative pole voltage Un121.3V. If this step has already been performed, then U is addedp1,Un1And the last sampled Up2，Un2The calculation of the insulation value is performed.
3. Disconnecting positive electrode optocoupler S1。
4. And after waiting for the rated time, sampling the anode and cathode voltages. Obtain the positive voltage Up2783.4V, negative pole voltage Un216.6V. By means of Up1，Un1,Up2,Un2The calculation of the insulation value is performed.
The calculation result is as follows: rp＝20.799M ohm,Rn100K ohm, the preset value is met.
Practical test case 2: negative insulation resistance RnAt 20M ohm, the insulation resistance of the positive electrode RpIs 20M ohm, the total pressure of the power supply is 800V, R1＝R2＝6M ohm，R3＝16M ohm。
And (3) test acquisition: u shapep1＝349.4V,Un1＝450.6V
Up2＝399.9V,Un2＝400.1V
The calculation result is as follows: rp＝20.161M ohm,RnMeet the preset value of 20.205M ohm.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. An insulated sampling circuit, characterized by: the device comprises a tested power supply, a first measuring resistor R1, a second measuring resistor R2 and a third measuring resistor R3, wherein the resistance values of the first measuring resistor R1 and the second measuring resistor R2 are equal, the first measuring resistor R1 is connected with an anode insulation resistor Rp of the tested power supply in parallel, the second measuring resistor R2 is connected with a cathode insulation resistor Rn of the tested power supply in parallel, the third measuring resistor R3 is connected with the first measuring resistor R1 in parallel or connected with a second measuring resistor R2 in parallel, and a first optical coupling switch S1 is connected to the third measuring resistor R3 in series.
2. The isolated sampling circuit of claim 1, wherein: the first measuring resistor is connected with a second optical coupling switch S2 in series, and the second measuring resistor is connected with a third optical coupling switch S3 in series.
3. An insulation measurement method using the insulation sampling circuit according to claim 2, characterized in that: the method comprises the following steps:
step S1: arranging a circuit diagram, and closing a first optical coupling switch S1, a second optical coupling switch S2 and a third optical coupling switch S3;
step S2: after waiting for a preset time, sampling the positive and negative voltages of the power supply to be detected to obtain a positive voltage Up1 and a negative voltage Un 1;
step S3: disconnecting the first optocoupler switch S1, and after waiting for a preset time, sampling the positive and negative voltages of the power supply to be tested to obtain a positive voltage Up2 and a negative voltage Un 2;
step S4: and calculating the anode insulation resistance and the cathode insulation resistance of the tested power supply according to the Up1, the Un1, the Up2 and the Un2 obtained by sampling.
4. The insulation measuring method according to claim 3, characterized in that: the calculation formula in step S4 is as follows:
5. the insulation measuring method according to claim 3, characterized in that: in the step S1, before the circuit is arranged, the first optical coupler switch S1, the second optical coupler switch S2 and the third optical coupler switch S3 are turned off, and after the circuit is arranged, the first optical coupler switch S1, the second optical coupler switch S2 and the third optical coupler switch S3 are turned on.
6. An insulation measurement system employing the insulation sampling circuit of claim 2, wherein: the system comprises the following modules:
module M1: arranging a circuit diagram, and closing a first optical coupling switch S1, a second optical coupling switch S2 and a third optical coupling switch S3;
module M2: after waiting for a preset time, sampling the positive and negative voltages of the power supply to be detected to obtain a positive voltage Up1 and a negative voltage Un 1;
module M3: disconnecting the first optocoupler switch S1, and after waiting for a preset time, sampling the positive and negative voltages of the power supply to be tested to obtain a positive voltage Up2 and a negative voltage Un 2;
module M4: and calculating the anode insulation resistance and the cathode insulation resistance of the tested power supply according to the Up1, the Un1, the Up2 and the Un2 obtained by sampling.
7. The insulation measurement system of claim 6, wherein: the calculation formula in the module M4 is as follows:
8. the insulation measurement system of claim 6, wherein: in the module M1, before a circuit is arranged, the first optocoupler switch S1, the second optocoupler switch S2 and the third optocoupler switch S3 are turned off, and after the circuit is arranged, the first optocoupler switch S1, the second optocoupler switch S2 and the third optocoupler switch S3 are turned on.
9. An insulation measuring device, characterized in that: comprising an insulated sampling circuit according to claim 1 or 2.
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| CN202111153562.6A CN113899951A (en) | 2021-09-29 | 2021-09-29 | Insulation sampling circuit, measurement method and system thereof and measurement device |
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| CN202111153562.6A CN113899951A (en) | 2021-09-29 | 2021-09-29 | Insulation sampling circuit, measurement method and system thereof and measurement device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501611A (en) * | 2016-10-28 | 2017-03-15 | 深圳市航盛电子股份有限公司 | Insulation resistance detection method and device |
| CN111060791A (en) * | 2019-12-30 | 2020-04-24 | 华人运通(江苏)技术有限公司 | Insulation fault detection method and device, electric vehicle, terminal equipment and medium |
| CN212932785U (en) * | 2020-07-31 | 2021-04-09 | 上汽通用汽车有限公司 | Battery test bed capable of automatically measuring insulation resistance |
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2021
- 2021-09-29 CN CN202111153562.6A patent/CN113899951A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501611A (en) * | 2016-10-28 | 2017-03-15 | 深圳市航盛电子股份有限公司 | Insulation resistance detection method and device |
| CN111060791A (en) * | 2019-12-30 | 2020-04-24 | 华人运通(江苏)技术有限公司 | Insulation fault detection method and device, electric vehicle, terminal equipment and medium |
| CN212932785U (en) * | 2020-07-31 | 2021-04-09 | 上汽通用汽车有限公司 | Battery test bed capable of automatically measuring insulation resistance |
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Address after: Room A205, building C, No. 205, Binhai 6th Road, Jinhai 2nd Road, airport new area, Longwan District, Wenzhou City, Zhejiang Province Applicant after: Ruipu Lanjun Energy Co.,Ltd. Applicant after: Shanghai ruipuqing innovative energy Co., Ltd Address before: 325000 room A205, building C, 205 Binhai 6th Road, Jinhai 2nd Road, Airport New District, Longwan District, Wenzhou City, Zhejiang Province Applicant before: RUIPU ENERGY Co.,Ltd. Applicant before: Shanghai ruipuqing innovative energy Co., Ltd |