CN218003615U - Insulation detection system and vehicle - Google Patents
Insulation detection system and vehicle Download PDFInfo
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- CN218003615U CN218003615U CN202221670895.6U CN202221670895U CN218003615U CN 218003615 U CN218003615 U CN 218003615U CN 202221670895 U CN202221670895 U CN 202221670895U CN 218003615 U CN218003615 U CN 218003615U
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Abstract
The utility model discloses an insulation detection system. Wherein, this system includes: the main control device is connected with the multichannel analog-to-digital converter, the first voltage division branch is connected with a power source to be detected in parallel, one end of the second voltage division branch is connected with the negative electrode of the power source to be detected, the other end of the second voltage division branch is connected with a first reference ground, the first voltage division branch is connected with a first channel of the multichannel analog-to-digital converter, the second voltage division branch is connected with a second channel of the multichannel analog-to-digital converter, the input end of the pulse modulation device is connected with the main control device, and the output end of the pulse modulation device is connected with a third channel of the multichannel analog-to-digital converter. The utility model provides a have insulating detection to receive the interference easily among the correlation technique, lead to the technical problem that detection accuracy is low, fail safe nature is poor.
Description
Technical Field
The utility model relates to an insulating detection area particularly, relates to an insulating detecting system.
Background
In the normal use process of new energy vehicle, in order to guarantee that there is good insulating state between high-voltage power supply and the automobile body to avoid electrocution or short circuit, need carry out real time monitoring to the bilateral insulation resistance of whole car, in order to guarantee electric automobile's safe operation. In the related art, a vehicle body structure is often adopted for insulation detection as a reference ground, and common-mode interference is introduced into insulation detection through the reference ground due to the fact that a high-frequency strong interference device generally exists on the high-voltage power supply side, so that the insulation detection operation is easy to be interfered by the high-voltage side device to cause abnormality, self-detection cannot be performed on the insulation detection, and the problems of low stability and low reliability of the insulation detection are caused.
In view of the above problems, no effective solution has been proposed.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an insulating detecting system to there is insulating detection to receive the interference easily in solving the correlation technique at least, lead to the technical problem that detection accuracy is low, fail safe nature is poor.
According to an aspect of the embodiments of the present invention, there is provided an insulation detection system, including: the power supply voltage divider comprises a first voltage dividing branch, a second voltage dividing branch, a multi-channel analog-to-digital converter, a pulse modulation device and a main control device, wherein the main control device is connected with the multi-channel analog-to-digital converter, the first voltage dividing branch is connected with a power supply to be detected in parallel, one end of the second voltage dividing branch is connected with the negative pole of the power supply to be detected, the other end of the second voltage dividing branch is connected with a first reference ground, the first voltage dividing branch is connected with a first channel of the multi-channel analog-to-digital converter, the second voltage dividing branch is connected with a second channel of the multi-channel analog-to-digital converter, the input end of the pulse modulation device is connected with the main control device, and the output end of the pulse modulation device is connected with a third channel of the multi-channel analog-to-digital converter, wherein the first voltage dividing branch is used for dividing voltage between the positive pole of the power supply to be detected and the negative pole of the power supply to be detected; the second voltage division branch is used for dividing voltage between the negative electrode of the power supply to be measured and the first reference ground; the pulse modulation equipment is used for receiving a first control signal provided by the main control equipment, converting the first control signal into a pulse signal and outputting the pulse signal to the third channel; the multichannel analog-to-digital converter is used for acquiring a first voltage division signal in the first voltage division branch and a second voltage division signal in the second voltage division branch, converting the pulse signal into a diagnosis signal, and outputting the first voltage division signal after analog-to-digital conversion, the second voltage division signal after analog-to-digital conversion and the diagnosis signal to the main control equipment; the master control device is configured to obtain an insulation detection result based on a diagnostic signal, the first voltage division signal after the analog-to-digital conversion, and the second voltage division signal after the analog-to-digital conversion.
Optionally, a fourth channel of the multichannel analog-to-digital converter is connected with a negative electrode of the power supply to be tested through a ground resistor to obtain a ground signal, and the multichannel analog-to-digital converter obtains the diagnosis signal based on the ground signal and the pulse signal.
Optionally, the first voltage dividing branch comprises: the multi-channel analog-to-digital converter comprises a first voltage dividing resistor and a second voltage dividing resistor, wherein the first voltage dividing resistor and the second voltage dividing resistor are connected in series, a connection point of the multi-channel analog-to-digital converter and the first voltage dividing branch is located between the first voltage dividing resistor and the second voltage dividing resistor, and a connection point of a first channel of the multi-channel analog-to-digital converter and the first voltage dividing branch is an acquisition point of a first voltage dividing signal.
Optionally, the second voltage dividing branch comprises: the third voltage dividing resistor and the fourth voltage dividing resistor are connected in series to form a third voltage dividing branch, the switch transistor and the fifth voltage dividing resistor are connected in series to form a fourth voltage dividing branch, the third voltage dividing branch is connected in parallel with the fourth voltage dividing branch, and a connection point of the multichannel analog-to-digital converter and the second voltage dividing branch is located between the third voltage dividing resistor and the fourth voltage dividing resistor, wherein a connection point of the second channel of the multichannel analog-to-digital converter and the second voltage dividing branch is an acquisition point of the second voltage dividing signal.
Optionally, the switch transistor is connected to the main control device, and configured to control on/off of the fourth voltage division branch after receiving a second control signal from the main control device.
Optionally, the switching transistor is a metal-oxide field effect MOS transistor.
Optionally, the multi-channel analog-to-digital converter communicates with the main control device through a serial peripheral interface bus.
Optionally, the multi-channel analog-to-digital converter and the master control device both use the negative electrode of the power supply to be tested as a target reference ground.
Optionally, the first reference ground is a vehicle body ground, wherein the vehicle body ground is formed by connecting non-insulated vehicle body shells.
According to the utility model discloses an on the other hand of the embodiment still provides a vehicle, include: the insulation detection system comprises a power supply to be detected and any one of the insulation detection systems, wherein the insulation detection system is used for detecting the insulation condition of the power supply to be detected.
In the embodiment of the present invention, through a first voltage division branch, a second voltage division branch, a multi-channel analog-to-digital converter, a pulse modulation device, a main control device, wherein the main control device is connected to the multi-channel analog-to-digital converter, the first voltage division branch is connected to a power source to be tested in parallel, one end of the second voltage division branch is connected to a negative electrode of the power source to be tested, the other end of the second voltage division branch is connected to a first reference ground, the first voltage division branch is connected to a first channel of the multi-channel analog-to-digital converter, the second voltage division branch is connected to a second channel of the multi-channel analog-to-digital converter, an input end of the pulse modulation device is connected to the main control device, an output end of the pulse modulation device is connected to a third channel of the multi-channel analog-to-digital converter, wherein the first voltage division branch is used for dividing voltage between an anode of the power source to be tested and a negative electrode of the power source to be tested; the second voltage division branch is used for dividing voltage between the negative electrode of the power supply to be measured and the first reference ground; the pulse modulation equipment is used for receiving a first control signal provided by the main control equipment, converting the first control signal into a pulse signal and outputting the pulse signal to the third channel; the multichannel analog-to-digital converter is used for acquiring a first voltage division signal in the first voltage division branch and a second voltage division signal in the second voltage division branch, converting the pulse signal into a diagnosis signal, and outputting the first voltage division signal after analog-to-digital conversion, the second voltage division signal after analog-to-digital conversion and the diagnosis signal to the main control equipment; the master control device is configured to obtain an insulation detection result based on a diagnostic signal, the first voltage division signal after the analog-to-digital conversion, and the second voltage division signal after the analog-to-digital conversion. The method and the device have the advantages that the interference introduced by a reference ground is reduced, the insulation detection is self-checked, the purpose of improving the insulation detection capability is achieved, the reliability of the insulation detection is improved, the technical effect of improving the safety of a vehicle is further achieved, and the technical problems that the insulation detection is easily interfered in the related technology, the detection accuracy is low, and the safety and reliability are poor are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram of an alternative insulation detection system according to the related art;
fig. 2 is a schematic block diagram of an alternative insulation detection system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an alternative insulation detection system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an alternative multi-channel analog-to-digital converter for an insulation detection system according to an embodiment of the present invention;
fig. 5 is a self-test schematic diagram of an alternative insulation detection system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
First, for the convenience of understanding the embodiments of the present invention, some terms or nouns related to the present invention will be explained below:
an Analog to Digital converter (ADC) refers to a device that converts a continuously varying Analog signal into a discrete Digital signal.
Serial Peripheral Interface bus (SPI) refers to a high-speed full-duplex synchronous communication bus.
Pulse Width Modulation (PWM) refers to an analog control method that modulates the bias state of a transistor according to a corresponding load change to change the output. The method is widely applied to the power control and conversion field of measurement and communication.
Example 1
In the related art, an electric bridge method is often adopted for insulation detection, and different results of voltage division are measured by controlling the on and off of parallel resistors between the total positive and total negative of a power supply to be detected and the ground of a vehicle body respectively to obtain an insulation detection result. Fig. 1 is a schematic view of an alternative insulation detection system according to the related art, as shown in fig. 1, which is mainly divided into two parts: a voltage division and switching circuit composed of resistors and switches is multiplexed; a voltage measuring circuit is composed of a mode converter. Wherein the figures include the following reference numerals: RN is the equivalent insulation resistance of the positive pole of the high-voltage battery to the vehicle body ground, RP is the equivalent insulation resistance of the negative pole of the high-voltage battery to the vehicle body ground, K1 is a switch for controlling the positive pole voltage division loop of the high-voltage battery, K2 is a switch for controlling the negative pole voltage division loop of the high-voltage battery, and R1, R2, R3, R4, R5 and R6 are all resistors, wherein R1, R2 and R5 form the positive pole voltage division loop of the high-voltage battery, R3, R4 and R6 form the negative pole voltage division loop of the high-voltage battery, V1 is an insulation detection collection point of the positive pole of the high-voltage battery, V2 is an insulation detection collection point of the negative pole of the high-voltage battery, and ADC represents an analog-to-digital converter.
Because RN and RP cannot be directly measured, the voltage value acquired by the insulation detection circuit needs to be calculated. The voltage values from the anode and the cathode of the high-voltage battery to the ground of the vehicle body are respectively measured through V1 and V2, different voltage values can be measured at the positions of V1 and V2 by closing and opening K1 and K2, the values of the insulation resistances RN and RP can be obtained through the voltage through operation, and then an insulation detection result is obtained.
As can be seen from the above, the voltage signal of the positive electrode of the high-voltage battery enters the ADC through the voltage dividing circuits R1 and R2, and the voltage signal of the negative electrode of the high-voltage battery enters the ADC through the voltage dividing circuits R3 and R4, so that the following problems occur: the problem that the high-voltage battery is easy to interfere exists, voltage signals of the anode and the cathode of the high-voltage battery enter a voltage dividing circuit and directly enter a low-voltage system, and due to the fact that the high-voltage battery is provided with interference sources such as a motor and a direct-current stabilized voltage power supply, the interference signals easily influence the operation of the low-voltage system and further influence the stability and reliability of insulation detection. The problem of low diagnosis coverage rate exists, the self diagnosis of the insulation detection circuit is lacked, and the phenomenon that the function of measuring voltage of the analog-digital converter is abnormal, so that the operation result of insulation resistance is influenced, and the insulation detection fails is avoided.
To solve the above problem, an embodiment of the present invention provides a system embodiment of an insulation detection system, fig. 2 is according to the present invention, as shown in fig. 2, the system includes: a first voltage-dividing branch 102, a second voltage-dividing branch 104, a multi-channel analog-to-digital converter 106, a pulse modulation device 108, and a main control device 110, wherein the main control device 110 is connected to the multi-channel analog-to-digital converter 106, the first voltage-dividing branch 102 is connected in parallel to a power source to be tested, one end of the second voltage-dividing branch 104 is connected to a negative electrode of the power source to be tested, the other end of the second voltage-dividing branch 104 is connected to a first reference ground, the first voltage-dividing branch 102 is connected to a first channel of the multi-channel analog-to-digital converter 106, the second voltage-dividing branch 104 is connected to a second channel of the multi-channel analog-to-digital converter 106, an input end of the pulse modulation device 108 is connected to the main control device 110, an output end of the pulse modulation device 108 is connected to a third channel of the multi-channel analog-to-digital converter 106,
a first voltage division branch 102, configured to divide voltage between the positive electrode of the power source to be tested and the negative electrode of the power source to be tested;
a second voltage division branch 104, configured to divide voltage between the negative electrode of the power supply to be tested and the first reference ground;
a pulse modulation device 108, configured to receive a first control signal provided by the main control device, convert the first control signal into a pulse signal, and output the pulse signal to the third channel;
a multi-channel analog-to-digital converter 106, configured to collect a first voltage division signal in the first voltage division branch and a second voltage division signal in the second voltage division branch, convert the pulse signal into a diagnostic signal, and output the first voltage division signal after analog-to-digital conversion, the second voltage division signal after analog-to-digital conversion, and the diagnostic signal to the main control device;
the main control device 110 is configured to obtain an insulation detection result based on the diagnostic signal, the first voltage division signal after the analog-to-digital conversion, and the second voltage division signal after the analog-to-digital conversion.
The embodiment of the utility model provides an in, the negative pole of the power that will await measuring is as the target ground of reference, carries out the subregion design to the different devices of high-low pressure side, reduces the high-pressure side's high frequency interference device and produces the common mode interference through the ground of reference of insulating detection, to the interference that insulating detection produced. The voltage division is carried out between the positive pole and the negative pole of the power supply to be detected through the first voltage division branch, and the multichannel analog-to-digital converter collects a first voltage division signal in the first voltage division branch through the first channel. And voltage division is carried out between the negative electrode of the power supply to be detected and the first reference ground through the second voltage division branch, and the multichannel analog-to-digital converter acquires a second voltage division signal in the second voltage division branch through the second channel. And the master control equipment controls the pulse modulation equipment to send out a pulse signal and outputs the pulse signal to a third channel of the multichannel analog-to-digital converter. The multi-channel analog-to-digital converter is used for converting an analog signal into a digital signal and converting a pulse signal into a diagnostic signal. And then, the main control equipment obtains the first voltage division signal, the second voltage division signal and the diagnosis signal after the analog-to-digital conversion, and obtains an insulation detection result.
Alternatively, the pulse adjusting device may be, but is not limited to, a pulse width modulation circuit.
Alternatively, the first control signal may be, but is not limited to, a duty ratio signal, for example, the first control signal may be a signal that is cycled by a plurality of sub-signals according to a preset rule, and for the convenience of understanding, the first sub-signal is a 100% duty ratio signal, the second sub-signal is an 80% duty ratio signal, the third sub-signal is a 60% duty ratio signal, the fourth sub-signal is a 40% duty ratio signal, and the fifth sub-signal is a 20% duty ratio signal. The preset rule is preset by the main control device, for example, the preset rule is set as: firstly, a first sub-signal is sent, the first sub-signal lasts for 1s and then is converted into a second sub-signal, the second sub-signal lasts for 1s and then is converted into a third sub-signal, the third sub-signal lasts for 1s and then is converted into a fourth sub-signal, the fourth sub-signal lasts for 1s and then is converted into a fifth sub-signal, and the fifth sub-signal lasts for 1s and then is converted into the first sub-signal. And circularly executing the preset rule until the main control equipment stops sending the first control signal to the pulse modulation equipment.
According to the embodiment of the utility model, above-mentioned multichannel analog to digital converter's fourth passageway is connected with the above-mentioned negative pole of the power that awaits measuring through ground resistance, obtains ground signal, and above-mentioned multichannel analog to digital converter obtains above-mentioned diagnostic signal based on above-mentioned ground signal and above-mentioned pulse signal.
The embodiment of the utility model provides an in, make multichannel analog to digital converter be connected with the negative pole of the power that awaits measuring through ground resistance for the fourth passageway is in low state of putting, and whether normal, the diagnostic signal is obtained based on the common collection function that characterizes multichannel analog to digital converter of ground signal and pulse signal.
It should be noted that the ground resistor is located between the fourth channel and the negative electrode of the power source to be measured, and in a normal case, the potential between the fourth channel and the negative electrode of the power source to be measured is balanced, so as to achieve the purpose of low setting potential.
According to the embodiment of the utility model provides a, above-mentioned first partial pressure branch road includes: the multi-channel analog-to-digital converter comprises a first voltage dividing resistor and a second voltage dividing resistor, wherein the first voltage dividing resistor and the second voltage dividing resistor are connected in series, a connection point of the multi-channel analog-to-digital converter and the first voltage dividing branch is located between the first voltage dividing resistor and the second voltage dividing resistor, and a connection point of the first channel of the multi-channel analog-to-digital converter and the first voltage dividing branch is an acquisition point of the first voltage dividing signal.
The embodiment of the utility model provides an in, first divider resistance establishes ties with second divider resistance and forms first divider branch road, carries out the partial pressure for the positive negative pole to the power that awaits measuring, and multichannel analog to digital converter's first passageway acquisition point is located between first divider resistance and the second divider resistance.
Optionally, the first voltage dividing resistor may be, but not limited to, a plurality of resistors connected in series and/or in parallel, for example, the resistance of the first voltage dividing resistor is selected according to specific requirements, and a plurality of combinations of resistors connected in series, in parallel, or in combination of series and parallel may be adopted to achieve the purpose that the result obtained by the combination is the same as the required resistance of the first voltage dividing resistor.
Optionally, the second voltage-dividing resistor may be, but not limited to, a plurality of resistors connected in series and/or in parallel, for example, the resistance of the second voltage-dividing resistor is selected according to specific requirements, and a plurality of combinations of the resistors connected in series, in parallel, or in combination of series and parallel may be adopted, so as to achieve the purpose that the result obtained after the combination is the same as the required resistance of the second voltage-dividing resistor.
It should be noted that, the first voltage dividing resistor is characterized by a resistance value between the positive electrode of the power supply to be detected and the collection point, and the second voltage dividing resistor is characterized by a resistance value between the negative electrode of the power supply to be detected and the collection point. In addition, the first voltage-dividing resistor and the second voltage-dividing resistor are also related to the multichannel analog-to-digital converter, and the first voltage-dividing signal acquired by the first channel needs to be within the working electrical parameter range of the multichannel analog-to-digital converter.
According to the utility model discloses embodiment, above-mentioned second partial pressure branch road includes: a third voltage dividing resistor, a fourth voltage dividing resistor, a fifth voltage dividing resistor and a switch transistor, wherein the third voltage dividing resistor and the fourth voltage dividing resistor are connected in series to form a third voltage dividing branch, the switch transistor and the fifth voltage dividing resistor are connected in series to form a fourth voltage dividing branch, the third voltage dividing branch is connected in parallel with the fourth voltage dividing branch, a connection point of the multichannel analog-to-digital converter and the second voltage dividing branch is located between the third voltage dividing resistor and the fourth voltage dividing resistor, and a connection point of the second channel of the multichannel analog-to-digital converter and the second voltage dividing branch is an acquisition point of the second voltage dividing signal.
The embodiment of the utility model provides an in, the second partial pressure branch road comprises a plurality of resistances and switching transistor, carries out the partial pressure in order to carry out between the negative pole of the power that awaits measuring and the first reference ground. The third voltage dividing branch is formed by connecting the third voltage dividing resistor and the fourth voltage dividing resistor in series, and the fourth voltage dividing branch is formed by connecting the switching transistor and the fifth voltage dividing resistor in series. And then the third voltage division branch and the fourth voltage division branch are connected in parallel to form a second voltage division branch. One parallel end is connected with the negative electrode of the power supply to be measured, the other parallel end is connected with the first reference ground, and a second channel acquisition point of the multichannel analog-to-digital converter is located between the third voltage dividing resistor and the fourth voltage dividing resistor to obtain a second voltage dividing signal.
Optionally, the third voltage dividing resistor may be, but not limited to, a plurality of resistors connected in series and/or in parallel, for example, according to specific requirements, a resistance value of the third voltage dividing resistor is selected, and a plurality of combinations of the resistors connected in series, in parallel, or in combination of series and parallel, and the like may be adopted to achieve the purpose that a result obtained by the combination is the same as a required resistance value of the third voltage dividing resistor.
Optionally, the fourth voltage dividing resistor may be, but not limited to, a plurality of resistors connected in series and/or in parallel, for example, according to specific requirements, a resistance value of the fourth voltage dividing resistor is selected, and a plurality of combinations of the resistors connected in series, in parallel, or in combination of series and parallel may be adopted, so as to achieve a result obtained by the combination, which is the same as a required resistance value of the fourth voltage dividing resistor.
Optionally, the fifth voltage-dividing resistor may be, but not limited to, a plurality of resistors connected in series and/or in parallel, for example, according to specific requirements, a resistance value of the fifth voltage-dividing resistor is selected, and a plurality of combinations of the resistors connected in series, in parallel, or in series and parallel, and the like may be adopted, so as to achieve a purpose that a result obtained by the combination is the same as a required resistance value of the fifth voltage-dividing resistor.
It should be noted that, the resistances of the third voltage dividing resistor and the fourth voltage dividing resistor are adjusted, so that the second voltage dividing signal acquired by the second channel is within the working electrical parameter range of the multi-channel analog-to-digital converter. And the current carrying of the switching transistor is adjusted by adjusting the resistance value of the fifth voltage-dividing resistor, so that the heating condition of the switching transistor is reduced, and the semiconductor device such as the switching transistor is beneficial to prolonging the service life and improving the reliability.
According to the embodiment of the utility model, above-mentioned switch transistor is connected with above-mentioned main control equipment for after receiving the second control signal that comes from above-mentioned main control equipment, control above-mentioned fourth partial pressure branch road break-make.
The embodiment of the utility model provides an in, master control equipment passes through the second control signal, the switching of control switch transistor, and then the break-make of control fourth partial pressure branch road reaches the purpose that changes the corresponding resistance of second partial pressure branch road, acquires the resistance that second partial pressure signal corresponds under the different break-make circumstances and obtains insulating testing result.
According to the embodiment of the present invention, the above-mentioned switch transistor is a metal-oxide field effect MOS transistor.
In the embodiment of the utility model provides an in, switch transistor is controlled by master control equipment and plays the effect of control circuit break-make, and switch transistor is metal-oxide field effect MOS transistor, is convenient for carry out the switching action of quick high frequency.
It should be noted that the switching transistor is a metal-oxide field effect MOS transistor, wherein when the gate receives a second control signal sent by the main control device, the source and the drain of the switching transistor are turned on, so that the fourth voltage dividing branch is in a closed state.
According to the embodiment of the utility model, above-mentioned multichannel analog to digital converter communicates through serial peripheral hardware interface bus with above-mentioned master control equipment.
The embodiment of the utility model provides an in, multichannel analog to digital converter communicates with master control equipment, and the communication mode of adoption communicates for serial peripheral hardware interface bus.
According to the embodiment of the utility model provides an, above-mentioned multichannel analog to digital converter and above-mentioned master control equipment all regard the negative pole of the above-mentioned power that awaits measuring as the target ground of referring to.
The embodiment of the utility model provides an in, multichannel analog to digital converter and master control equipment belong to the low pressure system (distinguish with high-pressure power side) as insulating detecting system's partly, receive the signal interference of high-pressure power side easily and lead to gathering inaccurately or can not normally work. The negative pole of the power supply to be detected is set as a common target reference ground of the multi-channel analog-to-digital converter and the main control equipment, so that common-mode interference introduced by the common ground of the multi-channel analog-to-digital converter and the high-voltage side is facilitated, and the reliability of insulation detection is improved.
According to the utility model discloses the aforesaid first reference ground is automobile body ground, wherein, above-mentioned automobile body ground is that non-insulating automobile body shell is connected and is formed.
In the embodiment of the present invention, the body ground formed by connecting the body shells which are not insulated is used as the first reference ground. A large number of different devices are connected into the vehicle body as a whole vehicle, and various interferences are easily introduced. The embodiment of the utility model provides an in the target reference ground be the power negative pole that awaits measuring, be different from the automobile body ground, be favorable to reducing common mode interference.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the anti-interference capability is improved, and compared with the prior art that the cathode of the power supply to be detected is used as a reference ground, the influence of interference signals in a high-voltage loop on insulation detection work can be effectively avoided; the diagnosis coverage rate is improved, the multi-channel analog-to-digital converter is subjected to self-detection through the first control signal, and the signal reliability in the voltage acquisition range is determined.
According to the present invention, a preferred embodiment is provided.
Fig. 3 is a schematic diagram of an alternative insulation detection system according to an embodiment of the present invention. Fig. 4 is a schematic diagram of an alternative multi-channel analog-to-digital converter of the insulation detection system according to an embodiment of the present invention. As shown in fig. 3, wherein the above figures include the following reference numerals: RN is the equivalent insulation resistance of the positive pole of the power supply to be tested to the vehicle body ground, RP is the equivalent insulation resistance of the negative pole of the power supply to be tested to the vehicle body ground, R1, R2, R3, R4, R5, R6, R7 and R8 are all resistors, Q1 and Q2 are switching transistors, R4 and R5 are connected in series to form a first voltage division loop, R1 and R2 are connected in series to form a third voltage division loop, R3 and Q2 are connected in series to form a fourth voltage division loop, the third voltage division loop and the fourth voltage division loop are connected in parallel to form a second voltage division loop, R7 is a ground resistor, B-represents the negative pole of the power supply to be tested, C1 is a capacitor, D1 is a diode, L1 is an inductor, and Q1, C1, D1, L1 and R8 form a pulse width modulation circuit. As shown in fig. 4, the multichannel analog-to-digital converter is used for acquiring signals and performing analog-to-digital conversion.
After the insulation detection system is connected with a power supply to be detected in parallel, the voltage of the positive electrode passes through a first voltage division loop formed by connecting R4 and R5 in series, a first voltage division signal is collected by a channel 1 of the multichannel analog-to-digital converter, the voltage of the negative electrode passes through a second voltage division loop formed by R1, R2, R3 and Q2, and a second voltage division signal is collected by a channel 2 of the multichannel analog-to-digital converter, wherein the Q2 is controlled by a main control device to execute the operation of opening and closing the loop. The main control equipment forms a pulse width modulation circuit through Q1, C1, D1, L1 and R8, sends a pulse signal to a channel 7 of the multichannel analog-to-digital converter, obtains a grounding signal in a channel 0 through a grounding resistor R7, and obtains a diagnosis signal based on the pulse signal and the grounding signal. The multi-channel analog-to-digital converter is communicated with the main control equipment, the diagnosis signal, the first voltage division signal and the second voltage division signal are transmitted to the main control equipment, and the main control equipment obtains an insulation detection result.
For the sake of understanding, specific examples are shown in fig. 3, such as: the maximum voltage of the battery system to be tested is 600V, R1=200K Ω, R2= R4=6M Ω, R3= R5=43K Ω, R7= R8=100K Ω, L1=40uh, c1=12.5uf, and the effective range of the voltage acquired by the analog-to-digital converter is calculated to be 0V to 5V. The specific numerical values mentioned above are merely examples and do not limit the present application. When insulation detection is carried out, the main control equipment is responsible for controlling the Q2 to be switched on and off, and calculation is carried out according to the change of the first voltage division signal and the second voltage division signal collected by the analog-to-digital converter. When a fault is diagnosed, the main control equipment is responsible for controlling the duty ratio of the pulse width modulation circuit, receiving a diagnosis signal of the analog-to-digital converter, and diagnosing the operation condition of the analog-to-digital converter according to the pulse signal and the diagnosis signal of the channel 0 and the channel 7 acquired by the analog-to-digital converter. Q1, D1, L1, R8, C1 constitute pulse width modulation circuit, and pulse width modulation signal's cycle sets up to 100kHz, and master control equipment can adjust pulse width modulation signal's duty cycle signal through first control signal, and table 1 is first control signal's setting, and as shown in table 1, first control signal can be sent for multiple duty cycle signal circulation for the pulse signal of pulse modulation equipment output is between 1V to 5V. Fig. 5 is a schematic diagram of a self-test of an alternative insulation detection system according to an embodiment of the present invention, and the diagnostic mechanism is shown in fig. 5.
TABLE 1
| Duty ratio signal | Output pulse signal | Duration of signal |
| 100％ | 5V | 1s |
| 80％ | 4V | 1s |
| 60％ | 3V | 1s |
| 40％ | 2V | 1s |
| 20％ | 1V | 1s |
When the main control device controls Q2 to be disconnected, the first partial pressure signal value measured by the channel 1 of the analog-to-digital converter is U1 and ranges from 0 to 5V, the second partial pressure signal value measured by the channel 2 of the analog-to-digital converter is V1 and ranges from 0 to 5V,
controlling Q2 closure at a master deviceWhen the first voltage division branch is closed, the R1 is connected to the second voltage division branch, the first voltage division signal value measured by the channel 1 of the analog-to-digital converter is U2 and ranges from 0 to 5V, the second voltage division signal value measured by the channel 2 of the second voltage division signal is V2 and ranges from 0 to 5V,
since R2= R4, R3= R5,
to obtain
Further solving to obtain:
the equivalent insulation resistance of the anode of the power supply to be detected to the vehicle body ground and the equivalent insulation resistance of the cathode of the power supply to be detected to the vehicle body ground are obtained through the method, so that the insulation detection result is obtained.
According to the utility model provides a preferred embodiment can realize avoiding the interference influence analog-to-digital converter and the work of back stage circuit of high-pressure side to carry out the self-detection to the analog-to-digital converter trouble, with the diagnosis coverage that improves insulating detecting system, the insulating detection function anomaly of avoiding analog-to-digital converter trouble to arouse improves insulating detecting system's accuracy and reliability.
It should be noted that the specific structure of the insulation detection system shown in fig. 2 to 3 in this application is only illustrative, and the insulation detection system in this application may have more or less structures than the insulation detection system shown in fig. 2 to 3 in a specific application.
The embodiment of the utility model provides a still provide a vehicle, include: a power source to be tested, and the insulation detection system of any of the embodiments above, wherein the insulation detection system is configured to detect an insulation condition of the power source to be tested.
In addition, it should be noted that, for alternative or preferred embodiments of the present embodiment, reference may be made to the relevant description in embodiment 1, and details are not described herein again.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An insulation detection system, comprising: the device comprises a first voltage division branch, a second voltage division branch, a multichannel analog-to-digital converter, a pulse modulation device and a main control device, wherein the main control device is connected with the multichannel analog-to-digital converter, the first voltage division branch is connected with a power supply to be tested in parallel, one end of the second voltage division branch is connected with the negative pole of the power supply to be tested, the other end of the second voltage division branch is connected with a first reference ground, the first voltage division branch is connected with a first channel of the multichannel analog-to-digital converter, the second voltage division branch is connected with a second channel of the multichannel analog-to-digital converter, the input end of the pulse modulation device is connected with the main control device, the output end of the pulse modulation device is connected with a third channel of the multichannel analog-to-digital converter, wherein,
the first voltage division branch is used for dividing voltage between the anode of the power supply to be detected and the cathode of the power supply to be detected;
the second voltage division branch is used for dividing voltage between the negative electrode of the power supply to be measured and the first reference ground;
the pulse modulation equipment is used for receiving a first control signal provided by the main control equipment, converting the first control signal into a pulse signal and outputting the pulse signal to the third channel;
the multichannel analog-to-digital converter is used for acquiring a first voltage division signal in the first voltage division branch and a second voltage division signal in the second voltage division branch, converting the pulse signal into a diagnosis signal, and outputting the first voltage division signal after analog-to-digital conversion, the second voltage division signal after analog-to-digital conversion and the diagnosis signal to the main control equipment;
the master control device is used for obtaining an insulation detection result based on a diagnosis signal, the first partial pressure signal after the analog-to-digital conversion and the second partial pressure signal after the analog-to-digital conversion.
2. The insulation detection system according to claim 1, wherein a fourth channel of the multi-channel analog-to-digital converter is connected to a negative electrode of the power source to be detected through a ground resistor to obtain a ground signal, and the multi-channel analog-to-digital converter obtains the diagnosis signal based on the ground signal and the pulse signal.
3. The insulation detection system of claim 1, wherein the first voltage division branch comprises: the multi-channel analog-to-digital converter comprises a first voltage dividing resistor and a second voltage dividing resistor, wherein the first voltage dividing resistor and the second voltage dividing resistor are connected in series, a connection point of the multi-channel analog-to-digital converter and the first voltage dividing branch is located between the first voltage dividing resistor and the second voltage dividing resistor, and a connection point of a first channel of the multi-channel analog-to-digital converter and the first voltage dividing branch is an acquisition point of a first voltage dividing signal.
4. The insulation detection system of claim 1 wherein said second voltage dividing branch comprises: the third voltage dividing resistor and the fourth voltage dividing resistor are connected in series to form a third voltage dividing branch, the switch transistor and the fifth voltage dividing resistor are connected in series to form a fourth voltage dividing branch, the third voltage dividing branch is connected in parallel with the fourth voltage dividing branch, and a connection point of the multichannel analog-to-digital converter and the second voltage dividing branch is located between the third voltage dividing resistor and the fourth voltage dividing resistor, wherein a connection point of the second channel of the multichannel analog-to-digital converter and the second voltage dividing branch is an acquisition point of the second voltage dividing signal.
5. The insulation detection system according to claim 4, wherein the switching transistor is connected to the main control device, and configured to control on/off of the fourth voltage dividing branch after receiving a second control signal from the main control device.
6. The insulation detection system of claim 4 wherein said switching transistor is a metal-oxide field effect MOS transistor.
7. The insulation detection system of claim 1, wherein said multi-channel analog-to-digital converter communicates with said master device via a serial peripheral interface bus.
8. The insulation detection system of claim 1, wherein the multi-channel analog-to-digital converter and the master device both use a negative pole of the power supply under test as a target reference ground.
9. The insulation detection system as recited in any one of claims 1 to 8, wherein the first reference ground is a body ground, wherein the body ground is formed by connecting body shells that are not insulated.
10. A vehicle, characterized by comprising: a power supply under test, and the insulation detection system of any one of claims 1 to 9, wherein the insulation detection system is configured to detect an insulation condition of the power supply under test.
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| CN202221670895.6U CN218003615U (en) | 2022-06-30 | 2022-06-30 | Insulation detection system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221670895.6U CN218003615U (en) | 2022-06-30 | 2022-06-30 | Insulation detection system and vehicle |
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