CN113238169B - Method for detecting missing ground, readable storage medium, and vehicle - Google Patents
Method for detecting missing ground, readable storage medium, and vehicle Download PDFInfo
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- CN113238169B CN113238169B CN202110281740.7A CN202110281740A CN113238169B CN 113238169 B CN113238169 B CN 113238169B CN 202110281740 A CN202110281740 A CN 202110281740A CN 113238169 B CN113238169 B CN 113238169B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention provides a method for detecting a loss of land, a readable storage medium and a vehicle. The method for detecting the ground loss comprises the steps of judging whether a difference value between a sum of inflow currents of a first terminal group and a sum of outflow currents of a second terminal group exceeds a first preset range or not and judging whether a difference value between a first voltage and a second voltage exceeds a second preset range or not. The configuration covers all working conditions possibly occurring when the DC-DC converter is out of the ground, comprehensively and accurately detects the out-of-ground condition of the DC-DC converter, and solves the problem that the out-of-ground detection method of the DC-DC converter is lacking in the prior art.
Description
Technical Field
The present invention relates to the field of vehicles, and in particular, to a method for detecting a loss of land, a readable storage medium, and a vehicle.
Background
In a 48V dc-dc converter (48V DCDC) product, a 48V DCDC ground terminal is connected to the product housing and to the vehicle body ground. When the connection between the 48V DCDC grounding terminal and the ground of the vehicle body is disconnected or the contact is poor (ground is lost), the 48V DCDC cannot normally output power according to the expected design function or cannot output stable voltage, and the power shortage of the 12V storage battery of the whole vehicle is caused when the power shortage is serious, and the whole vehicle cannot normally work.
The same problem exists for other types of dc-dc converters on board the vehicle.
In order to avoid the phenomenon of abnormality found in time when the DC-DC converter loses the ground, so that the whole vehicle layer can give prompt in time and take corresponding measures, and avoid the further influence of the abnormality on the operation of the whole vehicle, a method is needed to comprehensively and accurately detect the loss of the ground condition of the DC-DC converter.
In the prior art, a method for detecting the ground losing condition of a direct current-direct current converter is lacking.
Disclosure of Invention
The invention aims to provide a method for detecting the missing ground, a readable storage medium and a vehicle, which are used for solving the problem that the prior art lacks a method for detecting the missing ground of a direct current-direct current converter.
In order to solve the above technical problem, according to a first aspect of the present invention, there is provided a ground fault detection method for detecting whether a dc-dc converter ground wire is lost, the ground fault detection method comprising: counting the sum of the outflow currents of the first terminal group; counting the sum of the inflow currents of the second terminal group; judging whether the difference value between the total sum of the outflow currents and the total sum of the inflow currents exceeds a first preset range or not to obtain a first judging result; judging whether the difference value between the first voltage and the second voltage exceeds a second preset range or not to obtain a second judging result; the first voltage is a voltage difference between an output positive terminal and a ground terminal of the output side; the second voltage is the pressure difference between the positive terminal of the power supply at the output side and the ground of the vehicle body; when at least one of the first judging result or the second judging result is yes, determining that the grounding wire of the direct current-direct current converter is lost; otherwise, determining that the grounding wire of the DC-DC converter is not lost.
Optionally, the ground loss detection method is run cyclically in real time.
Optionally, after determining that the dc-dc converter ground wire is lost, the ground loss detection method further includes: outputting a preset signal to perform at least one of alarm, prompt and start a safety protection mechanism.
Optionally, the first terminal group includes the output side output positive terminal and the output side power supply negative terminal, and the second terminal group includes the input side input positive terminal, the output side power supply positive terminal and the ground terminal.
Optionally, the first terminal group includes only the output-side output positive terminal, and the second terminal group includes only the input-side input positive terminal and the ground terminal.
Optionally, the input side rated voltage of the dc-dc converter is higher than the output side rated voltage of the dc-dc converter.
Optionally, the rated voltage of the input side of the direct current-direct current converter is 48V, and the rated voltage of the output side of the direct current-direct current converter is 12V.
In order to solve the above technical problem, according to a second aspect of the present invention, there is provided a readable storage medium having a program stored thereon, which when executed, performs the above-described loss of land detection method.
In order to solve the above technical problem, according to a third aspect of the present invention, there is provided a vehicle including a dc-dc converter and a controller for detecting whether a dc-dc converter ground line is lost, the controller being specifically configured to: counting the sum of the outflow currents of the first terminal group; counting the sum of the inflow currents of the second terminal group; judging whether the difference value between the total sum of the outflow currents and the total sum of the inflow currents exceeds a first preset range or not to obtain a first judging result; judging whether the difference value between the first voltage and the second voltage exceeds a second preset range or not to obtain a second judging result; the first voltage is a voltage difference between an output positive terminal and a ground terminal of the output side; the second voltage is the voltage difference between the positive terminal of the power supply on the output side and the ground of the vehicle body. When at least one of the first judging result or the second judging result is yes, determining that the grounding wire of the direct current-direct current converter is lost; otherwise, determining that the grounding wire of the DC-DC converter is not lost.
Optionally, the vehicle further includes a first battery and a second battery, and the dc-dc converter includes the output side output positive terminal, an output side power supply negative terminal, an input side input positive terminal, the output side power supply positive terminal, and the ground terminal; wherein the rated voltage of the first battery is higher than the rated voltage of the second battery; the output positive terminal of the output side is connected with the positive electrode of the second battery and a load; the output side power supply negative terminal is connected with the body ground of the vehicle; the input side input positive terminal is connected with the positive electrode of the first battery; the output side power supply positive terminal is connected with the positive electrode of the second battery; the ground terminal is connected with a body ground of the vehicle; the negative electrode of the first battery is connected with the body ground of the vehicle; the negative electrode of the second battery is connected to the body ground of the vehicle.
Compared with the prior art, the invention provides the ground loss detection method, the readable storage medium and the vehicle, wherein the ground loss detection method simultaneously judges whether the difference value between the total current flowing in the first terminal group and the total current flowing out of the second terminal group exceeds a first preset range or not and judges whether the difference value between the first voltage and the second voltage exceeds a second preset range or not. The configuration covers all working conditions possibly occurring when the DC-DC converter is out of the ground, comprehensively and accurately detects the out-of-ground condition of the DC-DC converter, and solves the problem that the out-of-ground detection method of the DC-DC converter is lacking in the prior art.
Drawings
Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention. Wherein:
FIG. 1 is a schematic diagram of a DC-DC converter used in a method for detecting a loss of ground according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting a loss of place according to an embodiment of the present invention;
FIG. 3a is a schematic diagram of a first model of a loss of place detection method according to an embodiment of the present invention;
FIG. 3b is a schematic diagram of a second model of a loss of place detection method according to an embodiment of the present invention.
In the accompanying drawings:
1-a housing; 2-an internal circuit; 3-input side input positive terminal; 4-an output side power supply negative terminal; 5-an output side power supply positive terminal; 6-the output side outputs the positive terminal; 7-a ground terminal; 8-parasitic impedance; 9-a first cell; 10-a second battery.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.
As used in this disclosure, the singular forms "a," "an," and "the" include plural referents, the term "or" are generally used in the sense of comprising "and/or" and the term "several" are generally used in the sense of comprising "at least one," the term "at least two" are generally used in the sense of comprising "two or more," and the term "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance or number of features indicated. Thus, a feature defining "first," "second," "third," or "third" may explicitly or implicitly include one or at least two such features, with "one end" and "another end" and "proximal end" and "distal end" generally referring to the respective two portions, including not only the endpoints, but also the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, e.g., as being either a fixed connection, a removable connection, or as being integral therewith; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Furthermore, as used in this disclosure, an element disposed on another element generally only refers to a connection, coupling, cooperation or transmission between two elements, and the connection, coupling, cooperation or transmission between two elements may be direct or indirect through intermediate elements, and should not be construed as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation, such as inside, outside, above, below, or on one side, of the other element unless the context clearly indicates otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention provides a method for detecting the missing ground, a readable storage medium and a vehicle, which are used for solving the problem that the prior art lacks a method for detecting the missing ground of a direct current-direct current converter.
The following description refers to the accompanying drawings.
Referring to fig. 1 to 3b, fig. 1 is a schematic diagram illustrating a connection of a dc-dc converter applied in a ground fault detection method according to an embodiment of the invention; FIG. 2 is a flow chart of a method for detecting a loss of place according to an embodiment of the present invention; FIG. 3a is a schematic diagram of a first model of a loss of place detection method according to an embodiment of the present invention;
FIG. 3b is a schematic diagram of a second model of a loss of place detection method according to an embodiment of the present invention.
The present embodiment provides a method for detecting a loss of ground, which is used for detecting whether a grounding wire of a dc-dc converter is lost, referring to fig. 1, the dc-dc converter includes an input positive terminal 3, an output negative terminal 4, an output positive terminal 5, an output positive terminal 6, a grounding terminal 7, a housing 1, and an internal circuit 2. The ground terminal 7 is used for connecting the housing 1 and a vehicle body ground.
Referring to fig. 2, the method for detecting the loss of land includes:
s10, counting the sum of the outflow currents of the first terminal group;
s20, counting the sum of inflow currents of the second terminal group;
s30, judging whether the difference value between the total current of the outflow current and the total current of the inflow current exceeds a first preset range or not, and obtaining a first judgment result;
s40, judging whether the difference value between the voltage of the positive electrode terminal of the power supply at the output side and the voltage of the positive electrode terminal output at the output side exceeds a second preset range, and obtaining a second judging result;
s50, when at least one of the first judging result or the second judging result is yes, determining that the grounding wire of the direct current-direct current converter is lost; otherwise, determining that the grounding wire of the DC-DC converter is not lost.
It is to be understood that step S30 is for detecting whether the dc-dc converter is currently in the state of the first model of loss of ground. Referring to fig. 3a, the first model of losing ground refers to that when the ground terminal 7 is disconnected from the ground, parasitic impedance 8 exists between the housing 1 of the dc-dc converter and the ground.
Under normal conditions, according to kirchhoff's current law, the sum of the currents entering the dc-dc converter and the sum of the currents exiting the dc-dc converter should be equal, i.e.:
I_T40+I_T30e+I_T31p＝I_T30p+I_T31e。
wherein i_t40 is the current flowing into the dc-dc converter through the input-side input positive terminal 3, i_t30e is the current flowing into the dc-dc converter through the output-side power supply positive terminal 5, and i_t31p is the current flowing into the dc-dc converter through the ground terminal 7; i_t30p is the current flowing out of the dc-dc converter through the output-side output positive terminal 6; i_t31e is the current flowing out of the dc-dc converter through the output side power supply negative terminal 4.
In the working condition shown in fig. 3a, when the ground is lost, the ground resistance becomes larger, the current i_t31p flowing through the ground terminal 7 decreases, and a part of the current flows into the dc-dc converter through the parasitic resistance 8, and at this time, according to kirchhoff's current law:
(i_t30p+i_t31e) - (i_t40+i_t30e+i_t31p+i_rpar) =0, wherein i_rpar is the current flowing into the dc-dc converter through the parasitic impedance 8.
That is to say:
(I_T30p+I_T31e)－(I_T40+I_T30e+I_T31p)>I_Cal。
wherein i_cal is a standard quantity, and may be calculated by using the current i_rpar (for example, i_rpar is directly used or i_rpar is calculated after security conversion), where i_cal corresponds to the first preset range.
It should be understood that in the present embodiment, it is essentially determined whether (i_t30p+i_t31e) - (i_t3040+i_t30e+i_t31p) > i_cal is satisfied or not, and equivalent conversion based on the above-described concept, for example, whether 2 (i_t30p+i_t31e) -2 (i_t30e+i_t31p) >2i_cal is satisfied or not, whether (i_t40+i_t30e+i_t31p) - (i_t30p+i_t31e) < -i_cal is satisfied or whether (i_t30p+i_t31e) - (i_t30e+i_t30e) > i_cal is satisfied or whether it is determined by a circuit method should be regarded as whether (i_t30p+i_t31e) - (i_t30e+i_t31p) > i_cal is satisfied or not.
It will be appreciated that in one embodiment, the first terminal set includes the output side output positive terminal 6 and the output side power supply negative terminal 4, and the second terminal set includes the input side input positive terminal 3, the output side power supply positive terminal 5 and the ground terminal 7.
Also, since in the dc-dc converter, i_t30e=i_t31e, the determination process can be simplified to determine whether the following formula holds:
I_T30p－(I_T40+I_T31p)>I_Cal。
for the specific implementation of the above-mentioned judging process, the idea of judging whether (i_t30p+i_t31e) - (i_t40+i_t30e+i_t31p) > i_cal is satisfied or not may be referred to, that is, the equivalent mathematical transformation of i_t30p- (i_t40+i_t31p) > i_cal or the judgment by a circuit manner should be regarded as judging whether i_t30p- (i_t40+i_t31p) > i_cal is satisfied or not.
That is, in a preferred embodiment, the first terminal group includes only the output-side output positive terminal 6, and the second terminal group includes only the input-side input positive terminal 3 and the ground terminal 7.
It is to be understood that step S40 is used to detect whether the dc-dc converter is currently in the state of the second model of loss of ground. Referring to fig. 3b, the second model of loss of ground refers to that the parasitic impedance 8 does not exist between the housing 1 of the dc-dc converter and the ground of the vehicle body after the ground terminal 7 is disconnected from the ground of the vehicle body.
The output voltage u_t30p of the dc-dc converter is normally close to the voltage u_t30e of the second battery 10. The u_t30p may be obtained by measuring a pressure difference between the output-side output positive terminal 6 and the ground terminal 7, and the u_t30e may be obtained by measuring a pressure difference between the output-side power supply positive terminal 5 and the vehicle body ground. When the grounding wire is lost and the parasitic impedance 8 is not present between the housing 1 of the dc-dc converter and the ground of the vehicle body, the grounding terminal 7 is in a suspended state, and cannot be lost according to kirchhoff current law. At this time, the output voltage u_t30p of the dc-dc converter gradually decreases due to its own control characteristics, and the voltage u_t30e of the second battery 10 maintains a normal value, that is:
U_T30e－U_T30p>U_Cal。
the U_Cal is a calibration quantity, and can be calibrated according to system parameters and safety requirements. When U_T30e-U_T30p is larger than a certain threshold, namely the difference value between the first voltage and the second voltage is large enough, the occurrence of the phenomenon of loss can be judged. U_Cal corresponds to the second preset range.
For a specific implementation manner of the judging process of U_t30e-U_t30p > U_cal, the understanding can be made with reference to the idea of judging whether (i_t30p+i_t31e) - (i_t40+i_t30e+i_t31p) > i_cal is true, that is, the equivalent mathematical transformation of U_t30e-U_t30p > U_cal, or the judgment by a circuit manner should be regarded as judging whether U_t30e-U_t30p > U_cal is true.
Based on the above analysis, in order to be able to fully detect the grounding condition of the dc-dc converter, it is necessary to determine whether the dc-dc converter is in the first loss of ground model or the second loss of ground model at the same time, that is, by performing the determination in step S50, and finally obtaining the determination result.
Through the steps, whether the DC-DC converter is in the off-ground working condition currently can be comprehensively and accurately judged, and the problem that the off-ground detection method of the DC-DC converter is lacking in the prior art is solved.
In this embodiment, the method for detecting a loss of land is run in real time in a cyclic manner, so as to ensure that the occurrence of the loss of land can be found at the first time, thereby avoiding greater loss.
Preferably, after determining that the dc-dc converter ground wire is lost, the ground loss detection method further includes: outputting a preset signal to perform at least one of alarm, prompt and start a safety protection mechanism.
In this embodiment, the input side rated voltage of the dc-dc converter is higher than the output side rated voltage of the dc-dc converter. Specifically, the input side rated voltage of the dc-dc converter is 48V, and the output side rated voltage of the dc-dc converter is 12V. It is to be understood that the described method of ground loss detection can also be used for dc-dc converters with other values of nominal voltage.
The present embodiment also provides a readable storage medium having a program stored thereon, which when executed, performs the above-described method of detecting a loss of land.
The embodiment also provides a vehicle, which is characterized by comprising a direct current-direct current converter and a controller, wherein the controller is used for detecting whether a grounding wire of the direct current-direct current converter is lost or not, and the controller is specifically used for: counting the sum of the outflow currents of the first terminal group; counting the sum of the inflow currents of the second terminal group; judging whether the difference value between the total sum of the outflow currents and the total sum of the inflow currents exceeds a first preset range or not to obtain a first judging result; judging whether the difference value between the first voltage and the second voltage exceeds a second preset range or not to obtain a second judging result; the first voltage is a voltage difference between the output positive terminal 6 and the ground terminal 7 at the output side; the second voltage is the voltage difference between the output side power supply positive terminal 5 and the vehicle body ground; when at least one of the first judging result or the second judging result is yes, determining that the grounding wire of the direct current-direct current converter is lost; otherwise, determining that the grounding wire of the DC-DC converter is not lost.
Further, the vehicle further includes a first battery 9 and a second battery 10, and the dc-dc converter includes the output side output positive terminal 6, an output side power supply negative terminal 4, an input side input positive terminal 3, the output side power supply positive terminal 5, and a ground terminal 7; wherein the rated voltage of the first battery 9 is higher than the rated voltage of the second battery 10; the output-side output positive terminal 6 is connected with the positive electrode of the second battery and a load; the output side power supply negative terminal 4 is connected with the body ground of the vehicle; the input side input positive terminal 3 is connected with a positive electrode of the first battery 9; the output side power supply positive terminal 5 is connected with the positive electrode of the second battery 10; the ground terminal 7 is connected to a body ground of the vehicle; the negative electrode of the first battery 9 is connected to the body ground of the vehicle; the negative electrode of the second battery 10 is connected to the body ground of the vehicle.
The connection relationship of the above-described in-vehicle elements can also be understood with reference to fig. 1.
Other components in the vehicle and the connection manner thereof can be reasonably configured according to actual needs and common general knowledge by a person skilled in the art, and are not described in detail herein.
The readable storage medium and the vehicle adopt the method for detecting the loss of ground, so that the beneficial effect of comprehensively and accurately detecting the loss of ground of the direct current-direct current converter is also achieved.
In summary, in the method for detecting a ground loss, the readable storage medium and the vehicle provided in the present embodiment, the method for detecting a ground loss simultaneously determines whether a difference between a sum of an inflow current of the first terminal set and a sum of an outflow current of the second terminal set exceeds a first preset range and whether a difference between the first voltage and the second voltage exceeds a second preset range. The configuration covers all working conditions possibly occurring when the DC-DC converter is out of the ground, comprehensively and accurately detects the out-of-ground condition of the DC-DC converter, and solves the problem that the out-of-ground detection method of the DC-DC converter is lacking in the prior art.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention in any way, and any changes and modifications made by those skilled in the art in light of the foregoing disclosure will be deemed to fall within the scope and spirit of the present invention.
Claims (8)
1. A method for detecting loss of ground for a dc-dc converter, the method comprising:
counting the sum of the outflow currents of the first terminal group;
counting the sum of the inflow currents of the second terminal group;
judging whether the difference value between the total sum of the outflow currents and the total sum of the inflow currents exceeds a first preset range or not to obtain a first judging result;
judging whether the difference value between the first voltage and the second voltage exceeds a second preset range or not to obtain a second judging result; the first voltage is a voltage difference between an output positive terminal and a ground terminal of the output side; the second voltage is the pressure difference between the positive terminal of the power supply at the output side and the ground of the vehicle body;
when at least one of the first judging result or the second judging result is yes, determining that the grounding wire of the direct current-direct current converter is lost; otherwise, determining that the grounding wire of the DC-DC converter is not lost;
the first terminal group comprises an output side output positive terminal and an output side power supply negative terminal, and the second terminal group comprises an input side input positive terminal, the output side power supply positive terminal and the ground terminal;
or,
the first terminal group includes only the output-side output positive terminal, and the second terminal group includes only the input-side input positive terminal and the ground terminal.
2. The method of claim 1, wherein the method of detecting a loss of land is run in real time in a loop.
3. The loss of ground detection method according to claim 1 or 2, characterized in that after determining that the dc-dc converter ground line is lost, the loss of ground detection method further comprises:
outputting a preset signal to perform at least one of alarm, prompt and start a safety protection mechanism.
4. The loss of ground detection method according to claim 1 or 2, wherein an input side rated voltage of the dc-dc converter is higher than an output side rated voltage of the dc-dc converter.
5. The method of claim 4, wherein the input side voltage rating of the dc-dc converter is 48V and the output side voltage rating of the dc-dc converter is 12V.
6. A readable storage medium, characterized in that the readable storage medium has stored thereon a program which, when executed, performs the loss of place detection method according to any one of claims 1 to 5.
7. A vehicle comprising a dc-dc converter and a controller for detecting whether a dc-dc converter ground line is lost, the controller being specifically configured to:
counting the sum of the outflow currents of the first terminal group;
counting the sum of the inflow currents of the second terminal group;
judging whether the difference value between the total sum of the outflow currents and the total sum of the inflow currents exceeds a first preset range or not to obtain a first judging result;
judging whether the difference value between the first voltage and the second voltage exceeds a second preset range or not to obtain a second judging result; the first voltage is a voltage difference between an output positive terminal and a ground terminal of the output side; the second voltage is the pressure difference between the positive terminal of the power supply at the output side and the ground of the vehicle body;
when at least one of the first judging result or the second judging result is yes, determining that the grounding wire of the direct current-direct current converter is lost; otherwise, determining that the grounding wire of the DC-DC converter is not lost;
the first terminal group comprises an output side output positive terminal and an output side power supply negative terminal, and the second terminal group comprises an input side input positive terminal, the output side power supply positive terminal and the ground terminal;
or,
the first terminal group includes only the output-side output positive terminal, and the second terminal group includes only the input-side input positive terminal and the ground terminal.
8. The vehicle of claim 7, further comprising a first battery and a second battery, the dc-dc converter comprising the output side output positive terminal, the output side power negative terminal, the input side input positive terminal, the output side power positive terminal, and the ground terminal; wherein,
the rated voltage of the first battery is higher than the rated voltage of the second battery;
the output positive terminal of the output side is connected with the positive electrode of the second battery and a load;
the output side power supply negative terminal is connected with the body ground of the vehicle;
the input side input positive terminal is connected with the positive electrode of the first battery;
the output side power supply positive terminal is connected with the positive electrode of the second battery;
the ground terminal is connected with a body ground of the vehicle;
the negative electrode of the first battery is connected with the body ground of the vehicle;
the negative electrode of the second battery is connected to the body ground of the vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110281740.7A CN113238169B (en) | 2021-03-16 | 2021-03-16 | Method for detecting missing ground, readable storage medium, and vehicle |
Applications Claiming Priority (1)
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