CN112986683A - Insulation resistance detection device - Google Patents
Insulation resistance detection device Download PDFInfo
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- CN112986683A CN112986683A CN201911309761.4A CN201911309761A CN112986683A CN 112986683 A CN112986683 A CN 112986683A CN 201911309761 A CN201911309761 A CN 201911309761A CN 112986683 A CN112986683 A CN 112986683A
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- resistor
- insulation resistance
- insulation
- resistance
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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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- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses an insulation resistance detection device, comprising: the two ends of the anode insulation resistor are respectively connected with the anode of the power supply and the vehicle body; the positive pole measures the resistance, measures the resistance and includes: the first positive pole measuring resistor and the second positive pole measuring resistor are connected in series, the first positive pole measuring resistor is connected with the positive pole of the power supply, and the second positive pole measuring resistor is connected with the vehicle body; the two ends of the conducting loop are respectively connected with the two ends of the first anode measuring resistor, and a conducting switch is arranged on the conducting loop; the two ends of the negative insulation resistor are respectively connected with the negative electrode of the power supply and the vehicle body; and the negative electrode of the measuring resistor is connected with the negative electrode of the power supply and the vehicle body respectively. The insulation resistance detection device has a real-time insulation monitoring function, can monitor the insulation resistance value of a vehicle in real time in the driving process of the vehicle, and can send early warning signals in time to prompt maintenance when abnormal conditions occur.
Description
Technical Field
The invention relates to the technical field of insulation monitoring, in particular to an insulation resistance detection device.
Background
The insulation monitoring technology is an important technology related to personal safety of the electric automobile, and according to related national regulations, the maximum direct current working voltage of the electric automobile needs to be lower than 1000V, and the human safety voltage needs to be lower than 35V.
In order to ensure the insulation safety of the vehicle-mounted battery of the electric automobile, the insulation resistance between the storage battery pack and the automobile body needs to be measured and an alarm needs to be given in time in the running process of the automobile. The main insulation monitoring methods in the prior art include: an alternating current signal injection method, a balanced bridge method, a high frequency signal injection method, and the like; the alternating current signal injection method, the high-frequency signal injection method and the balance bridge method cannot measure the accurate value of the insulation resistance, the alternating current signal injection method and the high-frequency signal injection method can only check whether the circuit is normal, and the balance bridge method can only adjust the resistance according to the product of the resistance of the opposite arms of the bridge to achieve the purpose that the specific contact potentials in the bridge are equal.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, an object of the present invention is to provide an insulation resistance detection device, which can monitor the insulation resistance of a vehicle in real time during the driving process of the vehicle, and can send an early warning signal in time to prompt maintenance when an abnormal condition occurs.
In order to achieve the above object, the present invention provides an insulation resistance detection device, including: the two ends of the positive insulation resistor are respectively connected with the positive electrode of the power supply and the vehicle body; a positive measurement resistance, the positive measurement resistance comprising: the first positive pole measuring resistor and the second positive pole measuring resistor are connected in series, the first positive pole measuring resistor is connected with the positive pole of the power supply, and the second positive pole measuring resistor is connected with the vehicle body; the two ends of the conducting loop are respectively connected with the two ends of the first anode measuring resistor, and a conducting switch is arranged on the conducting loop; the two ends of the negative insulation resistor are respectively connected with the negative electrode of the power supply and the vehicle body; and the two ends of the measuring resistor are respectively connected with the negative electrode of the power supply and the vehicle body.
The insulation resistance detection device is an integrated direct-current voltage insulation monitoring device designed according to a new energy direct-current power supply, has a real-time insulation monitoring function, can monitor the insulation resistance value of a vehicle in real time in the driving process of the vehicle, and can send early warning signals in time to prompt maintenance when abnormal conditions occur.
Further, still include: the first measuring chip is used for detecting the voltage obtained by dividing the positive insulation resistance, and the second measuring chip is used for detecting the voltage obtained by dividing the negative insulation resistance.
Further, the first measurement chip and the second measurement chip are integrated chips.
Further, still include: and the control center is in communication connection with the first measuring chip and the second measuring chip respectively.
Further, the second positive measurement resistance includes: the second positive electrode measuring resistor body is connected with the first positive electrode measuring resistor, and the first divider resistor is connected with the vehicle body.
Further, the negative measurement resistance includes: the negative electrode measuring resistor body is connected with the negative electrode of the power supply, and the second voltage-dividing resistor is connected with the vehicle body.
Further, the negative measurement resistor body includes: a first negative measurement resistor body and a second negative measurement resistor body connected in series with each other.
Further, still include: the casing, be provided with accommodation space in the casing, anodal insulation resistance anodal measuring resistance switch on the return circuit negative pole insulation resistance with negative pole measuring resistance sets up in the accommodation space.
Further, the housing is configured as a metal housing.
Further, a support plate is arranged in the shell and supported in the shell through an insulating support, and the positive insulation resistor, the positive measurement resistor, the conduction loop, the negative insulation resistor and the negative measurement resistor are arranged on the support plate.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a hardware block diagram of an insulation resistance detection apparatus according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an insulation resistance detecting apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a housing according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
An insulation resistance detection apparatus according to an embodiment of the present invention is described below with reference to fig. 1 to 3, including: the device comprises a positive electrode insulation resistance, a positive electrode measuring resistance, a conducting loop, a negative electrode insulation resistance and a negative electrode measuring resistance.
Specifically, two ends of the anode insulation resistor are respectively connected with the anode of the power supply and the vehicle body; the positive electrode measuring resistance includes: the first positive pole measuring resistor and the second positive pole measuring resistor are connected in series, the first positive pole measuring resistor is connected with the positive pole of the power supply, and the second positive pole measuring resistor is connected with the vehicle body; two ends of the conduction loop are respectively connected with two ends of the first anode measuring resistor, and a conduction switch is arranged on the conduction loop; two ends of the negative insulation resistor are respectively connected with the negative electrode of the power supply and the vehicle body; two ends of the measuring resistor are respectively connected with the negative pole of the power supply and the vehicle body.
According to the measurement diagrams of the anode insulation resistance and the cathode insulation resistance of the electric automobile, the resistance values of the anode insulation resistance and the cathode insulation resistance in the insulated power battery pack are deduced and calculated.
As shown in fig. 1, the MC9S12D64CPV chip is selected as the hardware system chip, the voltage of the positive insulation resistor and the voltage of the negative insulation resistor are sampled by the acquisition circuit, the resistance values of the positive insulation resistor and the negative insulation resistor are calculated, and after the processing by the chip, the chip communicates with the entire vehicle in a CAN communication mode, and the current state is indicated by the indicator lamp.
When the monitor knows the insulation resistance value of the whole vehicle at this moment in advance, a signal is sent to the control center by pressing the button, the control center samples the voltage of the anode insulation resistance and the voltage of the cathode insulation resistance through the acquisition circuit, the resistance values of the anode insulation resistance and the cathode insulation resistance in the insulation power battery pack are obtained through calculation, then the resistance values are processed through the chip, the insulation power battery pack is communicated with the whole vehicle in a CAN communication mode, the result is sent to the control center, and finally the control center indicates the current state through the indicator lamp.
The method comprises the following steps that firstly, a loop is conducted and is in a disconnected state, and the voltage of a positive insulation resistor and the voltage of a negative insulation resistor in an insulation resistor detection device are respectively sampled; then sampling the total pressure of the battery; the first formula is listed by the positive insulation resistance, the positive measurement resistance, the negative insulation resistance, and the negative measurement resistance.
Secondly, conducting a closed loop state, wherein the first anode measuring resistor is short-circuited, and sampling the voltage of an anode insulation resistor and the voltage of a cathode insulation resistor in the insulation resistor detection device respectively; then sampling the total pressure of the battery; the second formula is listed by the positive insulation resistance, the positive measurement resistance, the negative insulation resistance, and the negative measurement resistance.
And thirdly, the resistance values of the anode insulation resistor and the cathode insulation resistor in the insulated power battery pack can be obtained according to the first ohm formula and the second ohm formula.
The insulation resistance detection device is an integrated direct-current voltage insulation monitoring device designed according to a new energy direct-current power supply, has a real-time insulation monitoring function, can monitor the insulation resistance value of a vehicle in real time in the driving process of the vehicle, and can send an early warning signal in time to prompt maintenance when an abnormal condition occurs.
According to an embodiment of the present invention, the insulation resistance detecting apparatus further includes: the first measuring chip is used for detecting the voltage obtained by dividing the insulation resistance of the anode, and the second measuring chip is used for detecting the voltage obtained by dividing the insulation resistance of the cathode. The first measuring chip and the second measuring chip can be used for real-time voltage measurement; preferably, the first measurement chip and the second measurement chip can be CS5460A chips.
According to a specific embodiment of the present invention, the first measurement chip and the second measurement chip are integrated chips. The integrated chip integrates various functions such as a display function, a processing function and the like on one chip, so that the space can be saved, and the overall smoothness of the system is improved; in the invention, the selected CS5460A chip is an integrated chip which can be used for measuring voltage and current.
According to an embodiment of the invention, the system further comprises a control center, and the control center is respectively connected with the first measurement chip and the second measurement chip in a communication manner. And after being processed by the first measuring chip and the second measuring chip, the vehicle is communicated with the whole vehicle in a CAN communication mode.
The CAN communication circuit CAN be used for meeting the communication requirement between a vehicle controller and a battery management system, and CAN send the resistance values and the results of the anode insulation resistor and the cathode insulation resistor to the vehicle controller to optimize driving.
The key circuit can be used for debugging and monitoring, a certain time interval exists between two times of insulation resistance monitoring, and when monitoring is carried out, if the insulation resistance value of the whole vehicle is required to be known, the key circuit can be used for realizing the purpose.
The power circuit can obtain a non-isolated power supply and an isolated power supply through the power converter according to the actual requirements of various system components, and outputs power supplies with different voltage grades so as to drive various functional modules in the system.
In one embodiment of the present invention, as shown in fig. 2, the second positive measurement resistance comprises: and the second positive electrode measuring resistor body is connected with the first positive electrode measuring resistor, and the first divider resistor is connected with the vehicle body. The negative electrode measurement resistance includes: the negative electrode measuring resistor body and the second voltage-dividing resistor are connected in series, the negative electrode measuring resistor body is connected with the negative electrode of the power supply, and the second voltage-dividing resistor is connected with the vehicle body; specifically, the negative electrode measuring resistor body includes: a first negative measurement resistor body and a second negative measurement resistor body connected in series with each other.
Under the condition that the total voltage is not changed, a part of voltage can be dropped on the first voltage-dividing resistor and the second voltage-dividing resistor, so that the voltage at two ends of the resistors of the series-connected parts of the resistors is reduced, and the whole circuit is protected.
In one embodiment of the present invention, the first positive measurement resistance is R in FIG. 21The second positive electrode measuring resistor body is R2The first negative electrode measuring resistor body is R3And the second negative electrode measuring resistor body is R4The first voltage-dividing resistor is R, the second voltage-dividing resistor is R', and the anode insulation resistor is R+And the insulation resistance of the negative electrode is R-；
When the conduction loop is disconnected, the voltage at two ends of the anode insulation resistor is V1The voltage at two ends of the cathode insulation resistor is V2The first formula is derived from ohm's law:
similarly, when the conduction loop is closed, the voltage at two ends of the anode insulation resistor is V1', the voltage at two ends of the cathode insulation resistor is V2', the second formula is derived from ohm's law:
by combining the first formula and the second formula, the insulation resistance of the positive electrode can be calculated to be R+And the insulation resistance of the negative electrode is R_The value of (c).
When the calculated insulation resistance of the positive electrode is R+Or the insulation resistance of the negative electrode is R-When the value of the electric resistance is smaller than the standard resistance value, the system sends warning information to the whole vehicle to prompt parking for maintenance.
In an embodiment of the present invention, as shown in fig. 3, the insulation resistance detecting apparatus further includes a housing; specifically, a containing space is arranged in the shell, and the anode insulation resistor, the anode measuring resistor, the conduction loop, the cathode insulation resistor and the cathode measuring resistor are arranged in the containing space; preferably, the housing is designed as a metal housing. Because the electric automobile electrical system has larger voltage and magnetic field, the interference is worse, so the metal shell with the interference shielding function is preferably selected, and the shell can prevent water and dust.
According to a specific embodiment of the present invention, a support bottom plate is disposed in the housing, the support bottom plate is supported in the housing by an insulating support, and the positive insulation resistor, the positive measurement resistor, the conduction loop, the negative insulation resistor, and the negative measurement resistor are disposed on the support bottom plate. The insulation resistance detection device is an integral supporting bottom plate, and the supporting bottom plate is fixed in the shell through screws.
Because the casing selects metal material, in order to prevent the short circuit phenomenon from appearing in the circuit on the supporting baseplate, lay one deck insulating pad in the bottom of casing, the screw that is used for fixed supporting baseplate is supported with the insulating column, makes supporting baseplate and casing bottom unsettled.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An insulation resistance detection device, comprising:
the two ends of the positive insulation resistor are respectively connected with the positive electrode of the power supply and the vehicle body;
a positive measurement resistance, the positive measurement resistance comprising: the first positive pole measuring resistor and the second positive pole measuring resistor are connected in series, the first positive pole measuring resistor is connected with the positive pole of the power supply, and the second positive pole measuring resistor is connected with the vehicle body;
the two ends of the conducting loop are respectively connected with the two ends of the first anode measuring resistor, and a conducting switch is arranged on the conducting loop;
the two ends of the negative insulation resistor are respectively connected with the negative electrode of the power supply and the vehicle body;
and the two ends of the measuring resistor are respectively connected with the negative electrode of the power supply and the vehicle body.
2. The insulation resistance detecting device according to claim 1, further comprising: the first measuring chip is used for detecting the voltage obtained by dividing the positive insulation resistance, and the second measuring chip is used for detecting the voltage obtained by dividing the negative insulation resistance.
3. The insulation resistance detecting device according to claim 1, wherein the first measuring chip and the second measuring chip are integrated chips.
4. The insulation resistance detecting device according to claim 2 or 3, further comprising: and the control center is in communication connection with the first measuring chip and the second measuring chip respectively.
5. The insulation resistance detection device according to claim 1, wherein the second positive measurement resistance includes: the second positive electrode measuring resistor body is connected with the first positive electrode measuring resistor, and the first divider resistor is connected with the vehicle body.
6. The insulation resistance detection device according to claim 1, wherein the negative electrode measuring resistance includes: the negative electrode measuring resistor body is connected with the negative electrode of the power supply, and the second voltage-dividing resistor is connected with the vehicle body.
7. The insulation resistance detecting device according to claim 6, wherein the negative electrode measuring resistor body includes: a first negative measurement resistor body and a second negative measurement resistor body connected in series with each other.
8. The insulation resistance detecting device according to claim 1, further comprising: the casing, be provided with accommodation space in the casing, anodal insulation resistance anodal measuring resistance switch on the return circuit negative pole insulation resistance with negative pole measuring resistance sets up in the accommodation space.
9. The insulation resistance detecting apparatus according to claim 8, wherein the housing is configured as a metal housing.
10. The insulation resistance detecting device according to claim 9, wherein a support plate is provided in the housing, the support plate is supported in the housing by an insulation support, and the positive insulation resistance, the positive measurement resistance, the conduction loop, the negative insulation resistance, and the negative measurement resistance are provided on the support plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309761.4A CN112986683A (en) | 2019-12-18 | 2019-12-18 | Insulation resistance detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309761.4A CN112986683A (en) | 2019-12-18 | 2019-12-18 | Insulation resistance detection device |
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| CN112986683A true CN112986683A (en) | 2021-06-18 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983857A (en) * | 2014-04-25 | 2014-08-13 | 南车株洲电力机车研究所有限公司 | Direct current insulation monitoring circuit and method |
| CN104569607A (en) * | 2014-12-26 | 2015-04-29 | 北京泰兴科技有限公司 | Direct current insulation monitoring method and device |
| CN108333429A (en) * | 2018-02-28 | 2018-07-27 | 北京新能源汽车股份有限公司 | Power battery management system, the insulation resistance detection device of power battery and method |
| CN109917186A (en) * | 2019-03-13 | 2019-06-21 | 江苏迈吉易威电动科技有限公司 | A kind of vehicle high-voltage Insulation Inspection Device for Direct-Current System and monitoring method |
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2019
- 2019-12-18 CN CN201911309761.4A patent/CN112986683A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983857A (en) * | 2014-04-25 | 2014-08-13 | 南车株洲电力机车研究所有限公司 | Direct current insulation monitoring circuit and method |
| CN104569607A (en) * | 2014-12-26 | 2015-04-29 | 北京泰兴科技有限公司 | Direct current insulation monitoring method and device |
| CN108333429A (en) * | 2018-02-28 | 2018-07-27 | 北京新能源汽车股份有限公司 | Power battery management system, the insulation resistance detection device of power battery and method |
| CN109917186A (en) * | 2019-03-13 | 2019-06-21 | 江苏迈吉易威电动科技有限公司 | A kind of vehicle high-voltage Insulation Inspection Device for Direct-Current System and monitoring method |
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Application publication date: 20210618 |
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