CN111864839A - Method for detecting input line impedance and current-limiting protection input line by vehicle-mounted charger - Google Patents
Method for detecting input line impedance and current-limiting protection input line by vehicle-mounted charger Download PDFInfo
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- CN111864839A CN111864839A CN202010707614.9A CN202010707614A CN111864839A CN 111864839 A CN111864839 A CN 111864839A CN 202010707614 A CN202010707614 A CN 202010707614A CN 111864839 A CN111864839 A CN 111864839A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/18—Cables specially adapted for charging electric vehicles
-
- 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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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
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a method for detecting input line impedance and current-limiting protection of an input line by a vehicle-mounted charger, wherein the vehicle-mounted charger receives electric energy of a power grid end through the input line, and the method comprises the following steps: sampling the voltage and/or current of the vehicle-mounted charger end on the input line for multiple times before formal charging; calculating an impedance of the input line based on the sampling; based on the impedance of the input line, the voltage drop of the input line is controlled to limit the current of the input line so that the power of the input line when charging is below a safe value. The invention samples the voltage and/or current of the vehicle-mounted charger end on the input line for multiple times before formal charging, calculates the impedance of the input line, and then controls the voltage drop of the input line according to the impedance of the input line, thereby achieving the purpose of limiting the current of the input line. The power of the input line is lower than a safety value, excessive heat generated on the input line is avoided, and the input line is prevented from being burnt.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted power electronics of electric vehicles, in particular to a method for detecting input line impedance and current-limiting protection of an input line by a vehicle-mounted charger.
Background
The vehicle-mounted charger receives electric energy from a power grid end through an input cable, and the input cable is used as an important accessory of power transmission and is easy to become a weak link of power transmission due to the influence of factors such as manufacturing level, installation process, field environment and the like. Such as: interface partial discharge and cable insulation aging can make the cable extra temperature rise appear, lead to the cable to catch fire even under the extreme operating mode, and the joint explosion causes personal injury and death and economic loss. Simultaneously, cable joint is for the cable body, and the joint design is more complicated, and there is contact resistance in the contact surface for the problem of generating heat is more serious. Along with the improvement of the power requirement of the vehicle-mounted charger of the electric automobile, the current transmitted to the vehicle-mounted charger from the power grid end through the input cable is larger and larger, and the input cable is more likely to generate heat and fire.
Therefore, how to avoid the input line of the vehicle-mounted charger from generating heat and igniting is a problem which needs to be solved urgently in the industry.
Disclosure of Invention
The invention provides a method for detecting input line impedance and current-limiting protecting the input line by a vehicle-mounted charger, aiming at solving the technical problem that the input line of the vehicle-mounted charger is easy to catch fire under the application situation of a high-power vehicle-mounted charger in the prior art.
The technical scheme adopted by the invention is as follows:
a method for detecting input line impedance and current-limiting protection of an input line by a vehicle-mounted charger receives electric energy of a power grid end through the input line, and comprises the following steps: sampling the voltage and/or current at the vehicle-mounted charger end on the input line for multiple times before formal charging; calculating an impedance of the input line based on the sampling; controlling a voltage drop of the input line to limit a current of the input line based on an impedance of the input line such that a power of the input line when charging is below a safe value.
In an embodiment, before said sampling the voltage and/or current at the on-board charger side of the input line a plurality of times before the formal charging, further comprises: and judging whether the allowed input current reaches a preset first current value, if so, performing sampling on the voltage and/or the current of the vehicle-mounted charger end on the input line for multiple times before formal charging.
In one embodiment, said sampling the voltage and current at the on-board charger side of the input line a plurality of times before formal charging comprises: sampling a first voltage and/or a first current at an on-board charger side on the input line for a first time; second voltage and/or second current at the on-board charger side on the input line is sampled a second time.
In an embodiment, the first sampling is performed before the vehicle-mounted charger is started, and the second sampling is performed after the vehicle-mounted charger is started.
In one embodiment, the calculation formula for calculating the impedance of the input line based on the sampling is:
in an embodiment, the starting of the vehicle-mounted charger includes: and starting the vehicle-mounted charger by a preset second current value before the second sampling.
In an embodiment, the first sampling and the second sampling are both performed after the vehicle-mounted charger is turned on.
In one embodiment, the calculation formula for calculating the impedance of the input line based on the sampling is:
in an embodiment, the starting of the vehicle-mounted charger includes: and starting the vehicle-mounted charger by using a preset second current value before the first sampling, and starting the vehicle-mounted charger by using a preset third current value before the second sampling.
In one embodiment, the controlling the voltage drop of the input line comprises: the voltage drop is calculated from the impedance and the power rating of the input line.
Compared with the prior art, the invention has the following effects:
1. The voltage and/or current of the vehicle-mounted charger end on the input line are sampled for multiple times before formal charging, the impedance of the input line is calculated, and then the voltage drop of the input line is controlled according to the impedance of the input line, so that the aim of limiting the current of the input line is fulfilled. The power of the input line is lower than the safety value when charging, excessive heat generated on the input line is avoided, and the input line is prevented from being burnt.
2. Because the voltage and/or the current at the end of the vehicle-mounted charger on the input line are sampled by the vehicle-mounted charger, the impedance of the input line can be calculated without sampling the voltage and/or the current at the end of the power grid of the input line.
3. Whether the allowed input current reaches the preset first current value or not is judged, if yes, the voltage and/or the current of the power grid end of the input line are sampled, the impedance of the input line is calculated, accuracy of current limiting of the input line is improved, the voltage and/or the current of the power grid end of the input line do not need to be detected at any time, the impedance of the input line does not need to be calculated at any time, and calculation resources are saved.
4. The input line is started by setting the preset second current value and/or the preset third current value, and the voltage and/or the current of the vehicle-mounted charger end on the input line are/is sampled after the input line is started, so that the current value in the sampling process of the voltage and/or the current of the input line is limited not to be overlarge, and the input line is prevented from being burnt in the sampling process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic block diagram of a flow of a method for detecting an impedance of an input line and current-limiting protecting the input line by a vehicle-mounted charger according to an embodiment of the present invention;
fig. 2 is a block diagram illustrating a detailed flow of a method for detecting an impedance of an input line and current-limiting and protecting the input line by the vehicle-mounted charger according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a specific flow of a method for detecting an impedance of an input line and current-limiting and protecting the input line by a vehicle-mounted charger according to another embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The vehicle-mounted charger is electrically connected to the power grid end through an input line and receives electric energy of the power grid end. In some application scenarios, the impedance of the input line is too large due to problems such as poor contact and the like, and the power demand of the vehicle-mounted charger is higher and higher, so that the heat consumption of the input line is easily too large, and the input line is further damaged or even burnt and ignited. Therefore, a technical scheme is needed to prevent the damage, and based on the technical scheme, the invention provides a method for detecting the impedance of an input line and performing current-limiting protection on the input line by using a vehicle-mounted charger.
As shown in fig. 1, the method for detecting the input line impedance and current-limiting the input line by the vehicle-mounted charger includes: step S1: the method comprises the following steps that a vehicle-mounted charger samples the voltage and/or current of a vehicle-mounted charger end on an input line for many times before formal charging; step S2: calculating an impedance of the input line based on the sampling; step S3: based on the impedance of the input line, the voltage drop of the input line is controlled to limit the current of the input line so that the power of the input line when charging is below a safe value. The invention can obtain the impedance value of the input line based on the voltage and the current at the vehicle-mounted charger end of the input line, and then achieve the purpose of limiting the current of the input line based on the impedance value. The power of the input line is lower than a safety value, excessive heat generated on the input line is avoided, and the input line is prevented from being burnt or a fire disaster is avoided.
The following describes the above steps S1-S3 in detail:
step S1: the vehicle-mounted charger samples the voltage and/or current at the vehicle-mounted charger end on the input line for multiple times before formal charging.
Specifically, the method further includes, before step S1: step S0: and judging whether the allowed input current reaches a preset first current value or not. It should be noted that the allowable input current refers to the current allowed by the charging post/charging gun/vehicle-mounted charger and input into the charging post/charging gun/vehicle-mounted charger from the input line, and is determined by the electrical characteristics of the charging post/charging gun/vehicle-mounted charger. If yes, go to step S1. If not, step S1 is not executed. The preset first current value is a safe current value which ensures that the input line is not damaged or does not catch fire. As is known from joule's law, the heating power of the input line is determined by the impedance of the input line and the current flowing through the input line. When the input current allowed by the charging pile, the charging gun and the vehicle-mounted charger is lower than a preset first current value, the input line has less heat consumption due to smaller current, and the fire cannot be started. When the input current allowed by the charging pile, the charging gun and the vehicle-mounted charger reaches a preset first current value, if the impedance of an input line is too large, the heat consumption of the input line is too large, and the input line can be damaged or even a fire disaster is caused. Therefore, it is necessary to determine whether the input current allowed by the charging pile/charging gun/vehicle-mounted charger reaches a preset first current value, and when the preset first current value is reached, the voltage and the current at the input line charger end are sampled for multiple times before formal charging in the next step. According to the technical scheme, whether the input current allowed by the charging pile/charging gun/vehicle-mounted charger reaches the preset first current value or not is judged, if yes, the voltage and/or the current of the power grid end of the input line are/is sampled, the impedance of the input line is calculated, current limiting is carried out based on the impedance, the safety of the input line is guaranteed, and the accuracy of current limiting on the input line is improved. The voltage and/or the current of the power grid end of the input line do not need to be detected at any time, the impedance of the input line does not need to be calculated at any time, and the calculation resources are saved. The sampling may be a plurality of samplings equal to or greater than two, and is not limited to two samplings.
In one embodiment, the multiple sampling is sub-sampling, which is a first sub-sampling and a second sub-sampling. Specifically, step S1 includes: a first voltage and/or a first current at the vehicle charger side on a first sampling input line; a second voltage and/or a second current at the vehicle charger side on a second subsampling input line.
Step S2: the impedance of the input line is calculated based on the samples.
Specifically, assuming that the grid end voltage of the input line is U, the impedance of the input line is R, the first voltage at the vehicle-mounted charger end of the first sampling input line is U1, the first current is I1, the second voltage at the vehicle-mounted charger end of the second sampling input line is U2, and the second current is I2, the following equation can be obtained:
the simultaneous equations (1) and (2) solve the calculation formula of the impedance R of the available input line as follows:
the specific temporal locations for the first and second samples include at least two of the following embodiments.
Referring to fig. 2, in the first embodiment, the first sampling is performed before the vehicle-mounted charger is turned on, and the second sampling is performed after the vehicle-mounted charger is turned on. Since the first sampling is before the vehicle-mounted charger is started, the first current I1 at the input line vehicle-mounted charger end is 0 at this time. Therefore, the first current value I1 need not be sampled at this time. In this embodiment, the impedance of the input line is calculated as:
In a preferable aspect of the first embodiment, the method further includes: before sampling a second voltage and a second current at the end of the vehicle-mounted charger on an input line for the second time (after the vehicle-mounted charger is started up), the method further comprises the following steps: and starting the vehicle-mounted charger by a preset second current value. The input circuit is started by setting the preset second current value, and the voltage and the current of the vehicle-mounted charger terminal on the input circuit are sampled after the input circuit is started, so that the current value in the sampling process of the voltage and the current of the input circuit is limited not to be too large, and the input circuit is prevented from being burnt in the sampling process.
Referring to fig. 3, in the second embodiment, the first sampling and the second sampling are both performed after the vehicle-mounted charger is turned on. The calculation formula of the impedance of the input line at this time is:
similarly to the first embodiment, in a preferable scheme of the second embodiment, the method further includes: before sampling the first voltage and the first current at the end of the vehicle-mounted charger on the input line for the first time after starting up, the method further comprises the following steps: and starting the vehicle-mounted charger by a preset second current value. Before sampling the second voltage and the second current at the vehicle-mounted charger end on the input line for the second time after starting up, the method further comprises the following steps: and starting the vehicle-mounted charger by a preset third current value. The starting is carried out by setting the preset second current value and the preset third current value, and the voltage and the current of the vehicle-mounted charger end on the input line are sampled after the starting, so that the current value in the sampling process of the voltage and the current of the input line is limited not to be overlarge, and the input line is prevented from being burnt in the sampling process.
Because the voltage and/or the current at the end of the vehicle-mounted charger on the input line are sampled by the vehicle-mounted charger, the impedance of the input line can be calculated without sampling the voltage and/or the current at the end of the power grid of the input line.
Step S3: based on the impedance of the input line, the voltage drop of the input line is controlled to limit the current of the input line so that the power of the input line when charging is below a safe value.
According to ohm's law I = U/R, the current in the conductor is proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. Therefore, after the impedance value of the input line is obtained, the current of the input line can be controlled by controlling the voltage drop of the input line. It should be noted that the voltage drop of the control input line includes: and calculating the voltage drop according to the impedance and the rated power of the input line so as to ensure that the power of the input line during charging is operated within a safe value within a range not exceeding the rated power.
Compared with the prior art, the invention has the following effects:
1. the voltage and/or current of the vehicle-mounted charger end on the input line are sampled for multiple times before formal charging, the impedance of the input line is calculated, and then the voltage drop of the input line is controlled according to the impedance of the input line, so that the purpose of limiting the current of the input line is achieved. The power of the input line is lower than the safety value when charging, excessive heat generated on the input line is avoided, and the input line is prevented from being burnt.
2. Because the voltage and/or the current at the end of the vehicle-mounted charger on the input line are sampled by the vehicle-mounted charger, the impedance of the input line can be calculated without sampling the voltage and/or the current at the end of the power grid of the input line.
3. Whether the allowed input current reaches a preset first current value or not is judged, if yes, the voltage and/or the current of the power grid end of the input line are sampled, the impedance of the input line is calculated, accuracy of current limiting of the input line is improved, the voltage and/or the current of the power grid end of the input line do not need to be detected at any time, the impedance of the input line does not need to be calculated at any time, and calculation resources are saved.
4. The input line is started by setting the preset second current value and/or the preset third current value, and the voltage and/or the current of the vehicle-mounted charger end on the input line are/is sampled after the input line is started, so that the current value in the sampling process of the voltage and/or the current of the input line is limited not to be too large, and the input line is prevented from being burnt in the sampling process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for detecting input line impedance and current-limiting protection of an input line by a vehicle-mounted charger receives electric energy of a power grid end through the input line is characterized by comprising the following steps:
sampling the voltage and/or current at the vehicle-mounted charger end on the input line for multiple times before formal charging;
calculating an impedance of the input line based on the sampling;
controlling a voltage drop of the input line to limit a current of the input line based on an impedance of the input line such that a power of the input line when charging is below a safe value.
2. The method of claim 1, wherein prior to sampling the voltage and/or current at the vehicle charger side of the input line a plurality of times prior to final charging, further comprising: and judging whether the allowed input current reaches a preset first current value, if so, performing sampling on the voltage and/or the current of the vehicle-mounted charger end on the input line for multiple times before formal charging.
3. The method for detecting the impedance of the input line and performing current-limiting protection on the input line by the vehicle-mounted charger according to claim 1 or 2, wherein the step of sampling the voltage and the current at the end of the vehicle-mounted charger on the input line for a plurality of times before formal charging comprises the steps of:
Sampling a first voltage and/or a first current at an on-board charger side on the input line for a first time;
second voltage and/or second current at the on-board charger side on the input line is sampled a second time.
4. The method for detecting the impedance of the input line and protecting the input line by limiting the current of the vehicle-mounted charger according to claim 3, wherein the first sampling is performed before the vehicle-mounted charger is started, and the second sampling is performed after the vehicle-mounted charger is started.
5. The method of claim 4, wherein the calculation of the impedance of the input line based on the sampling is performed by the following equation:
6. the method for detecting the impedance of the input line and current-limiting the input line by the vehicle-mounted charger according to claim 4 or 5, wherein the starting of the vehicle-mounted charger comprises the following steps: and starting the vehicle-mounted charger by a preset second current value before the second sampling.
7. The method for detecting the impedance of the input line and current-limiting the input line of the vehicle-mounted charger according to claim 3, wherein the first sampling and the second sampling are both performed after the vehicle-mounted charger is turned on.
8. The method for the vehicle-mounted charger to detect the impedance of the input line and to current-limit protect the input line according to claim 7, wherein the calculation formula for calculating the impedance of the input line based on the sampling is as follows:
9. the method for detecting the impedance of the input line and current-limiting the input line by the vehicle-mounted charger according to claim 7 or 8, wherein the starting of the vehicle-mounted charger comprises the following steps: and starting the vehicle-mounted charger by using a preset second current value before the first sampling, and starting the vehicle-mounted charger by using a preset third current value before the second sampling.
10. The method of claim 1, wherein said controlling the voltage drop across said input line comprises: the voltage drop is calculated from the impedance and the power rating of the input line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010707614.9A CN111864839B (en) | 2020-07-21 | 2020-07-21 | Method for detecting input line impedance and current-limiting protection input line by vehicle-mounted charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010707614.9A CN111864839B (en) | 2020-07-21 | 2020-07-21 | Method for detecting input line impedance and current-limiting protection input line by vehicle-mounted charger |
Publications (2)
| Publication Number | Publication Date |
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| CN111864839A true CN111864839A (en) | 2020-10-30 |
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