CN112234583B - Overload protection method for inverter, computer readable storage medium and inverter - Google Patents
Overload protection method for inverter, computer readable storage medium and inverter Download PDFInfo
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- CN112234583B CN112234583B CN202011076035.5A CN202011076035A CN112234583B CN 112234583 B CN112234583 B CN 112234583B CN 202011076035 A CN202011076035 A CN 202011076035A CN 112234583 B CN112234583 B CN 112234583B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000009471 action Effects 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 8
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 10
- 230000001960 triggered effect Effects 0.000 abstract description 7
- 238000005070 sampling Methods 0.000 description 8
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides an overload protection method of a vehicle-mounted inverter, a computer-readable storage medium and the inverter, wherein the overload protection method of the vehicle-mounted inverter comprises the steps of reading load current of the inverter after the inverter is connected with a load; comparing the load current with a first preset current, wherein the first preset current is a preset multiple of the overload current of the inverter; and stopping the inverter from supplying power to the load when the load current is not smaller than the first preset current as a result of the comparison. By reasonably setting a preset current value, erroneous judgment is avoided, if the current of the load in normal operation does not exceed the overload current, the impact current in starting does not exceed the preset current value, overload protection is not started, otherwise, the preset current value is exceeded, overload protection is started, and unnecessary protection mechanism triggered by the impact current can be effectively avoided.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to an overload protection method of a vehicle-mounted inverter, a computer-readable storage medium and the inverter.
Background
The vehicle-mounted inverter can convert 12V direct current into 220V alternating current for common electric appliances, and is a convenient vehicle power converter. Vehicle power inverters are popular in foreign markets. Because of higher popularization rate of automobiles in foreign countries, the inverter can be used for connecting a storage battery to drive electric appliances and various tools to work during outgoing work or outgoing travel. At present, private vehicles in domestic markets are more and more, so that a vehicle-mounted inverter power supply is used as a converter for changing direct current into alternating current used in movement, brings great convenience to life of people, and is a stock automobile electronic harness.
The situation that the on-board inverter may appear after the load is added: 1. the surge voltage or surge current caused by capacitive load or inductive load is easy to make the chip for detecting the power overload, and the overload protection mechanism is mistakenly considered to be required to be triggered; 2. the load increase, when the load of the power supply (inverter) continuously rises and reaches the overload point, triggers an overload protection mechanism.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an overload protection method of a vehicle-mounted inverter, which is added with an overload protection control logic based on a conventional control logic, so that an unnecessary protection mechanism triggered by impact current can be effectively avoided.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an overload protection method of a vehicle-mounted inverter comprises the following steps:
reading the load current of the inverter after the inverter is connected to a load;
comparing the load current with a first preset current, wherein the first preset current is a preset multiple of the overload current of the inverter;
and stopping the inverter from supplying power to the load when the load current is not smaller than the first preset current as a result of the comparison. When the household appliance is started instantly, the chip which is easy to detect the overload of the power and the impact current caused by the capacitive load of the household appliance is mistakenly considered to be required to trigger the overload protection mechanism, a preset current value is reasonably set, the generation of erroneous judgment is avoided, if the current of the load in normal operation does not exceed the overload current, the overload protection is not started when the impact current in the starting process does not exceed the preset current value, otherwise, the preset current value is exceeded, the overload protection is started, and the unnecessary protection mechanism triggered by the impact current can be effectively avoided.
Further, the first preset current is not less than 2.5 times and not more than 10 times the overload current of the inverter. The inductive load of the household appliance can instantly cause the current value of the household appliance to be improved by 3-7 times, the capacitive load of the household appliance can instantly cause the current value of the household appliance to be improved by 2-3 times, and the first preset value can be set to be 2.5-10 times of the overload current value under the condition of further combining hardware.
Further, when the read current value is not smaller than the first preset current, performing a time delay action;
after the delay action is completed, the load current is read again;
comparing the read load current with a second preset current, wherein the second preset current is set to be an overload current value of the inverter;
and stopping the inverter from supplying power to the load when the load current read again is larger than the second preset current as a result of the comparison. And setting a preset period, and when the load current read in the preset period is determined to be in the condition of exceeding the overload current, eliminating the influence of the impact current and overload, wherein overload protection is required to be started.
Further, the delay time is t1, and t1 is less than or equal to 2s. The time of the impact current generated when the household appliance is used is very short, and in order to confirm whether the impact current is generated, the time delay action is carried out, generally, the time delay action is not suitable to exceed 2s, and the load current is read after exceeding 2s, so that erroneous judgment can be caused.
Further, when the load current is smaller than the first preset current as a result of the comparison, comparing the load current with a third preset current, wherein the third preset current is set as an overload current value of the inverter;
and stopping the inverter from supplying power to the load when the load current is larger than the third preset current as a result of the comparison. When the read current value is smaller than the first preset current, the influence of overlarge impact current can be eliminated, but whether the load is in a normal working state or the impact current is smaller at the moment cannot be confirmed, so that damage to the inverter caused by exceeding the overload current in the normal working state of the load is avoided, the load is required to be compared with the overload current value at the moment, and is in the normal working state and exceeds the overload current, and overload protection is required to be entered.
Further, when the read current value is larger than the third preset current, performing a time delay action;
after the delay action is completed, the load current is read again;
comparing the read load current with the third preset current;
and stopping the inverter from supplying power to the load when the load current read again is larger than the third preset current as a result of the comparison. And after the delay, the current is read again and compared with a third preset current, so that the condition of small impact current is eliminated, meanwhile, the damage to the inverter caused by the fact that overload current is exceeded for a long time under the normal working state of the load is avoided, the load is required to be compared with the overload current value and is larger than the overload current value, the load is in the normal working state and exceeds the overload current, and overload protection is required to be entered.
Further, the delay time is t2, and t2 is less than or equal to 2s. Accordingly, in order to avoid damage to the inverter caused by excessive time, the delay time should not exceed 2s.
Further, the load current is read at least twice;
comparing the read load current with the third preset current;
and when the comparison result shows that all the read load currents are smaller than the third preset current, displaying that the load cannot be driven. When the current values read for multiple times are smaller than the third preset value, the inverter is judged to be provided with a static load, and the current values are displayed through a display circuit.
A computer readable storage medium storing a computer program which when invoked by a processor implements the overload protection method of the vehicle-mounted inverter of any one of the above.
An inverter comprising a processor and a memory for storing a computer program which when invoked by the processor implements the overload protection method of the vehicle-mounted inverter of any of the above.
The overload protection method of the vehicle-mounted inverter, the computer readable storage medium and the inverter provided by the invention have the beneficial effects that: by reasonably setting a preset current value, erroneous judgment is avoided, if the current of the load in normal operation does not exceed the overload current, the impact current in starting does not exceed the preset current value, overload protection is not started, otherwise, the preset current value is exceeded, overload protection is started, and unnecessary protection mechanism triggered by the impact current can be effectively avoided.
Drawings
Fig. 1 is a flow chart of a first control mode of an overload protection method for a vehicle-mounted inverter according to the present invention.
Fig. 2 is a flow chart of a second control mode of the overload protection method of the vehicle-mounted inverter.
Fig. 3 is a flow chart of a third control mode of the overload protection method of the vehicle-mounted inverter.
Fig. 4 is a flow chart of a fourth control mode of the overload protection method of the vehicle-mounted inverter.
Fig. 5 is a flowchart of a fifth control method of the overload protection method of the vehicle-mounted inverter according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present invention.
Example 1: an overload protection method for a vehicle-mounted inverter.
An overload protection method for a vehicle-mounted inverter is shown in fig. 1, and specifically comprises the following steps:
reading the load current of the inverter after the inverter is connected to a load;
comparing the load current with a first preset current, wherein the first preset current is a preset multiple of the overload current of the inverter;
and stopping the inverter from supplying power to the load when the load current is not smaller than the first preset current as a result of the comparison. When the household appliance is started instantly, the chip which is easy to detect the overload of the power and the impact current caused by the capacitive load of the household appliance is mistakenly considered to be required to trigger the overload protection mechanism, a preset current value is reasonably set, the generation of erroneous judgment is avoided, if the current of the load in normal operation does not exceed the overload current, the overload protection is not started when the impact current in the starting process does not exceed the preset current value, otherwise, the preset current value is exceeded, the overload protection is started, and the unnecessary protection mechanism triggered by the impact current can be effectively avoided. The current value of the load can be acquired through the sampling current circuit, the current value acquired by the sampling current circuit can be read through the chip OPP pin, and the sampling voltage circuit can be used for replacing the sampling current circuit as conversion can be carried out between the current and the voltage, the voltage measured by the sampling voltage circuit is the voltage at two ends of the sampling voltage circuit (the voltage values at two ends of the sampling voltage circuit can change along with the change of the load current and can be converted through conversion relation), the voltage value acquired by the sampling current circuit can be read through the chip OPP pin, and the current preset value of the system is correspondingly converted into the voltage preset value.
The first preset current is not less than 2.5 times and not more than 10 times the overload current of the inverter. The inductive load of the household appliance can instantly cause the current value of the household appliance to be improved by 3-7 times, the capacitive load of the household appliance can instantly cause the current value of the household appliance to be improved by 2-3 times, and the first preset value can be set to be 2.5-10 times of the overload current value under the condition of further combining hardware.
As shown in fig. 2, when the read current value is not smaller than the first preset current, performing a delay action;
after the delay action is completed, the load current is read again;
comparing the read load current with a second preset current, wherein the second preset current is set to be an overload current value of the inverter;
and stopping the inverter from supplying power to the load when the load current read again is larger than the second preset current as a result of the comparison. And setting a preset period, and when the load current read in the preset period is determined to be in the condition of exceeding the overload current, eliminating the influence of the impact current and overload, wherein overload protection is required to be started. The delay action can be delayed by the delay function of the chip.
The delay time is t1, and t1 is less than or equal to 2s. The time of the impact current generated when the household appliance is used is very short, and in order to confirm whether the impact current is generated, the time delay action is carried out, generally, the time delay action is not suitable to exceed 2s, and the load current is read after exceeding 2s, so that erroneous judgment can be caused.
As shown in fig. 3, when the load current is smaller than the first preset current as a result of the comparison, comparing the load current with a third preset current, wherein the third preset current is set as an overload current value of the inverter;
and stopping the inverter from supplying power to the load when the load current is larger than the third preset current as a result of the comparison. When the read current value is smaller than the first preset current, the influence of overlarge impact current can be eliminated, but whether the load is in a normal working state or the impact current is smaller at the moment cannot be confirmed, so that damage to the inverter caused by exceeding the overload current in the normal working state of the load is avoided, the load is required to be compared with the overload current value at the moment, and is in the normal working state and exceeds the overload current, and overload protection is required to be entered.
As shown in fig. 4, when the read current value is greater than the third preset current, performing a delay action;
after the delay action is completed, the load current is read again;
comparing the read load current with the third preset current;
and stopping the inverter from supplying power to the load when the load current read again is larger than the third preset current as a result of the comparison. And after the delay, the current is read again and compared with a third preset current, so that the condition of small impact current is eliminated, meanwhile, the damage to the inverter caused by the fact that overload current is exceeded for a long time under the normal working state of the load is avoided, the load is required to be compared with the overload current value and is larger than the overload current value, the load is in the normal working state and exceeds the overload current, and overload protection is required to be entered. The delay action can be delayed by the delay function of the chip.
The delay time is t2, and t2 is less than or equal to 2s. Accordingly, in order to avoid damage to the inverter caused by excessive time, the delay time should not exceed 2s.
Reading the load current at least twice;
comparing the read load current with the third preset current;
and when the comparison result shows that all the read load currents are smaller than the third preset current, displaying that the load cannot be driven. When the current values read for multiple times are smaller than the third preset value, the inverter is judged to be provided with a static load, and the current values are displayed through a display circuit.
As shown in fig. 5, the overload protection method of the vehicle-mounted inverter may also be changed in the control manner shown in fig. 4, that is, when the read current value is not less than the first preset current, the inverter is directly stopped to supply power to the load.
In this embodiment, by reasonably setting a preset current value, erroneous judgment is avoided, if the current of the load in normal operation does not exceed the overload current, the overload protection is not started if the impact current of the load in starting does not exceed the preset current value, otherwise, the overload protection is started if the impact current exceeds the preset current value, and unnecessary protection mechanism triggered by the impact current can be effectively avoided.
Example 2: a computer readable storage medium.
A computer readable storage medium storing a computer program which when invoked by a processor implements the overload protection method of the vehicle-mounted inverter of any one of the above.
Example 3: an inverter.
An inverter comprising a processor and a memory for storing a computer program which when invoked by the processor implements the overload protection method of the vehicle-mounted inverter of any of the above.
The foregoing is a preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, so that the equivalents and modifications can be made without departing from the spirit of the disclosure.
Claims (6)
1. An overload protection method for a vehicle-mounted inverter is characterized by comprising the following steps of:
reading the load current of the inverter after the inverter is connected to a load;
comparing the load current with a first preset current, wherein the first preset current is a preset multiple of the overload current of the inverter;
when the read current value is not smaller than the first preset current, performing a delay action;
after the delay action is completed, the load current is read again;
comparing the read load current with a second preset current;
stopping the inverter from supplying power to the load when the load current read again is larger than the second preset current as a result of the comparison;
when the comparison result is that the load current is smaller than the first preset current, comparing the load current with a third preset current, wherein the third preset current is set as an overload current value of the inverter;
when the read current value is larger than the third preset current, performing a time delay action;
after the delay action is completed, the load current is read again;
comparing the read load current with the third preset current;
stopping the inverter to supply power to the load when the load current read again is larger than the third preset current as a result of the comparison, wherein the first preset current is not smaller than 2.5 times of the overload current of the inverter and not larger than 10 times of the overload current of the inverter,
the delay action is delayed by the delay function of the chip.
2. The overload protection method of the vehicle-mounted inverter as claimed in claim 1, wherein: the delay time is t1, and t1 is less than or equal to 2s.
3. The method for protecting an overload of a vehicle-mounted inverter according to claim 2, wherein the delay time is t2, and t2 is less than or equal to 2s.
4. The overload protection method of the vehicle-mounted inverter as claimed in claim 3, wherein: reading the load current at least twice; comparing the read load current with the third preset current; and when the comparison result shows that all the read load currents are smaller than the third preset current, displaying that the load cannot be driven.
5. A computer-readable storage medium storing a computer program, characterized by: the computer program, when invoked by a processor, implements the overload protection method of the vehicle-mounted inverter of any one of claims 1-4.
6. An inverter comprising a processor and a memory for storing a computer program, characterized in that the computer program when called by the processor implements the overload protection method of the vehicle-mounted inverter as claimed in any one of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011076035.5A CN112234583B (en) | 2020-10-10 | 2020-10-10 | Overload protection method for inverter, computer readable storage medium and inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011076035.5A CN112234583B (en) | 2020-10-10 | 2020-10-10 | Overload protection method for inverter, computer readable storage medium and inverter |
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| CN112234583A CN112234583A (en) | 2021-01-15 |
| CN112234583B true CN112234583B (en) | 2024-01-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118014A (en) * | 2010-11-26 | 2011-07-06 | 中国北方车辆研究所 | Adaptive load characteristic curve-based load over-current protection method |
| CN103207339A (en) * | 2013-04-28 | 2013-07-17 | 科博达技术有限公司 | Method and device for determining over-current of inverter |
| CN104238615A (en) * | 2014-09-11 | 2014-12-24 | 中山市马迅电器有限公司 | Voltage regulator capable of realizing overload protection based on software control |
| CN107294067A (en) * | 2016-03-30 | 2017-10-24 | 比亚迪股份有限公司 | Guard method, device and the electric automobile of inverter |
| CN207518262U (en) * | 2017-12-12 | 2018-06-19 | 广州市奔创电子科技有限公司 | A kind of intelligent load overpower and short-circuit protection inverter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002186172A (en) * | 2000-12-14 | 2002-06-28 | Kokusan Denki Co Ltd | Inverter power generator and control method in overloaded condition |
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2020
- 2020-10-10 CN CN202011076035.5A patent/CN112234583B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118014A (en) * | 2010-11-26 | 2011-07-06 | 中国北方车辆研究所 | Adaptive load characteristic curve-based load over-current protection method |
| CN103207339A (en) * | 2013-04-28 | 2013-07-17 | 科博达技术有限公司 | Method and device for determining over-current of inverter |
| CN104238615A (en) * | 2014-09-11 | 2014-12-24 | 中山市马迅电器有限公司 | Voltage regulator capable of realizing overload protection based on software control |
| CN107294067A (en) * | 2016-03-30 | 2017-10-24 | 比亚迪股份有限公司 | Guard method, device and the electric automobile of inverter |
| CN207518262U (en) * | 2017-12-12 | 2018-06-19 | 广州市奔创电子科技有限公司 | A kind of intelligent load overpower and short-circuit protection inverter |
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| CN112234583A (en) | 2021-01-15 |
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