CN112234583A - Overload protection method of inverter, computer readable storage medium and inverter - Google Patents
Overload protection method of inverter, computer readable storage medium and inverter Download PDFInfo
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- CN112234583A CN112234583A CN202011076035.5A CN202011076035A CN112234583A CN 112234583 A CN112234583 A CN 112234583A CN 202011076035 A CN202011076035 A CN 202011076035A CN 112234583 A CN112234583 A CN 112234583A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000009471 action Effects 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 abstract description 12
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- 238000005070 sampling Methods 0.000 description 8
- 230000001939 inductive effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
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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
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- 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
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 the 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 when the comparison result shows that the load current is not less than the first preset current, stopping the inverter to supply power to the load. The occurrence of misjudgment is avoided by reasonably setting a preset current value, if the current of the load during normal work does not exceed the overload current, the impact current of the load during start does not exceed the preset current value, the overload protection is not started, otherwise, the impact current exceeds the preset current value, the overload protection is started, and the 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 is a convenient vehicle power converter which can convert 12V direct current into 220V alternating current for general electric appliances. Vehicle power inverters are popular in foreign markets. In foreign countries, due to the high popularization rate of automobiles, the inverter can be connected with the storage battery to drive electric appliances and various tools to work when people go out for work or travel. At present, private vehicles are more and more in domestic market, so that the vehicle-mounted inverter power supply is used as a converter for converting direct current into alternating current for moving, brings much convenience to life of people, and is a conventional automobile electronic equipment.
The situation that the vehicle-mounted inverter may occur after load addition: 1. the impact voltage or impact current brought by capacitive load or inductive load is easy to cause the chip for detecting power overload to mistakenly think that an overload protection mechanism needs to be triggered; 2. when the load of the power supply (inverter) continuously rises and reaches an overload point, an overload protection mechanism is triggered.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an overload protection method of a vehicle-mounted inverter, which adds an overload protection control logic on the basis of the conventional control logic and can effectively avoid an unnecessary protection mechanism triggered by impact current.
In order to achieve the purpose, the invention adopts the following technical scheme:
an overload protection method for a vehicle-mounted inverter comprises the following steps:
reading the load current of the inverter after the inverter is connected into 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 when the comparison result shows that the load current is not less than the first preset current, stopping the inverter to supply power to the load. When the household appliance is started instantly, the chip for detecting the power overload is easy to be triggered by the impact current caused by the inductive load and the capacitive load of the household appliance, the overload protection mechanism is mistakenly judged to be required to be triggered, a preset current value is reasonably set, the occurrence of misjudgment is avoided, if the current of the load during normal work does not exceed the overload current, the overload protection is not started if the impact current of the load during start does not exceed the preset current value, otherwise, the impact current exceeds the preset current value, 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 of the overload current of the inverter and not more than 10 times of the overload current of the inverter. The current value of the household appliance can be instantly improved by 3-7 times due to the inductive load of the household appliance, the current value of the household appliance can be instantly improved by 2-3 times due to the capacitive load of the household appliance, and the first preset value can be set to be 2.5 times to 10 times of the overload current value by further combining the condition of hardware.
Further, when the read current value is not less than the first preset current, performing a time delay action;
after the time delay action is finished, reading the load current again;
comparing the load current read again with a second preset current, wherein the second preset current is set as an overload current value of the inverter;
and when the comparison result is that the load current read again is larger than the second preset current, stopping the inverter to supply power to the load. And setting a preset period, and under the condition that the read load currents in the preset period are all over the overload current, the influence of the impact current can be eliminated, the overload is caused, and the overload protection is required to be started at the moment.
Furthermore, the delay time is t1, and t1 is less than or equal to 2 s. The time of the inrush current generated when the household appliance is used is short, and the time-delay operation performed to determine whether the inrush current is present is generally not longer than 2s, and it is not preferable to read the load current after the inrush current exceeds 2s, which may cause erroneous determination.
Further, 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;
and when the comparison result shows that the load current is greater than the third preset current, stopping the inverter to supply power to the load. 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 is small cannot be determined, so that the situation that the overload current exceeds the overload current under the normal working state of the load to damage the inverter is avoided, the overload current value needs to be compared with the current value at the moment, if the overload current value is larger than the overload current value, the load is in the normal working state, the overload current exceeds the overload current, and overload protection needs to be performed.
Further, when the read current value is larger than the third preset current, performing time delay action;
after the time delay action is finished, reading the load current again;
comparing the load current read again with the third preset current;
and when the comparison result is that the load current read again is larger than the third preset current, stopping the inverter to supply power to the load. The current is read again after time delay and compared with the third preset current, so that the condition that the impact current is small is eliminated, meanwhile, the condition that the overload current is exceeded for a long time under the normal working state of the load to cause damage to the inverter is avoided, at the moment, the comparison with the overload current value is needed, if the comparison is larger than the overload current value, the load is in the normal working state, and the overload current is exceeded, and the overload protection is needed.
Furthermore, the delay time is t2, and t2 is less than or equal to 2 s. Accordingly, in order to avoid damage to the inverter caused by too long time, the delay time is not generally more than 2 s.
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. And when the current values read for multiple times are smaller than the third preset value, judging that the inverter carries no load, and displaying the load through the display circuit.
A computer-readable storage medium for storing a computer program that, when invoked by a processor, implements the overload protection method of the onboard inverter of any of the above.
An inverter comprising a processor and a memory for storing a computer program that when invoked by the processor implements the method of overload protection for a 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: the occurrence of misjudgment is avoided by reasonably setting a preset current value, if the current of the load during normal work does not exceed the overload current, the impact current of the load during start does not exceed the preset current value, the overload protection is not started, otherwise, the impact current exceeds the preset current value, the overload protection is started, and the unnecessary protection mechanism triggered by the impact current can be effectively avoided.
Drawings
Fig. 1 is a schematic flow chart of a first control method of an overload protection method for a vehicle-mounted inverter according to the present invention.
Fig. 2 is a schematic flow chart of a second control method of the overload protection method for the vehicle-mounted inverter according to the present invention.
Fig. 3 is a schematic flow chart of a third control method of the overload protection method for the vehicle-mounted inverter according to the present invention.
Fig. 4 is a schematic flow chart of a fourth control mode of the overload protection method for the vehicle-mounted inverter according to the present invention.
Fig. 5 is a schematic flow chart of a fifth control manner of the overload protection method for the vehicle-mounted inverter according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step 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 comprises the following specific steps:
reading the load current of the inverter after the inverter is connected into 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 when the comparison result shows that the load current is not less than the first preset current, stopping the inverter to supply power to the load. When the household appliance is started instantly, the chip for detecting the power overload is easy to be triggered by the impact current caused by the inductive load and the capacitive load of the household appliance, the overload protection mechanism is mistakenly judged to be required to be triggered, a preset current value is reasonably set, the occurrence of misjudgment is avoided, if the current of the load during normal work does not exceed the overload current, the overload protection is not started if the impact current of the load during start does not exceed the preset current value, otherwise, the impact current exceeds the preset current value, the overload protection is started, and the unnecessary protection mechanism triggered by the impact current can be effectively avoided. Wherein can gather the current value of load through the sampling current circuit, and remove the current value of reading the sampling current circuit collection through chip OPP pin, because can convert between electric current and the voltage, certainly also can use the sampling voltage circuit to replace the sampling current circuit, the voltage that sampling voltage circuit surveyed this moment is the voltage at sampling voltage circuit both ends (the voltage value at sampling voltage circuit both ends can change along with load current's change, simultaneously can convert through the conversion relation between the two), chip OPP pin removes the voltage value of reading the sampling current circuit collection this moment, corresponding current conversion default with the system is voltage default.
The first preset current is not less than 2.5 times and not more than 10 times of the overload current of the inverter. The current value of the household appliance can be instantly improved by 3-7 times due to the inductive load of the household appliance, the current value of the household appliance can be instantly improved by 2-3 times due to the capacitive load of the household appliance, and the first preset value can be set to be 2.5 times to 10 times of the overload current value by further combining the condition of hardware.
As shown in fig. 2, when the read current value is not less than the first preset current, a time delay operation is performed;
after the time delay action is finished, reading the load current again;
comparing the load current read again with a second preset current, wherein the second preset current is set as an overload current value of the inverter;
and when the comparison result is that the load current read again is larger than the second preset current, stopping the inverter to supply power to the load. And setting a preset period, and under the condition that the read load currents in the preset period are all over the overload current, the influence of the impact current can be eliminated, the overload is caused, and the overload protection is required to be started at the moment. 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 2 s. The time of the inrush current generated when the household appliance is used is short, and the time-delay operation performed to determine whether the inrush current is present is generally not longer than 2s, and it is not preferable to read the load current after the inrush current exceeds 2s, which may cause erroneous determination.
As shown in fig. 3, when the comparison result indicates that the load current is smaller than the first preset current, the load current is compared with a third preset current, where the third preset current is set as an overload current value of the inverter;
and when the comparison result shows that the load current is greater than the third preset current, stopping the inverter to supply power to the load. 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 is small cannot be determined, so that the situation that the overload current exceeds the overload current under the normal working state of the load to damage the inverter is avoided, the overload current value needs to be compared with the current value at the moment, if the overload current value is larger than the overload current value, the load is in the normal working state, the overload current exceeds the overload current, and overload protection needs to be performed.
As shown in fig. 4, when the read current value is greater than the third preset current, performing a delay operation;
after the time delay action is finished, reading the load current again;
comparing the load current read again with the third preset current;
and when the comparison result is that the load current read again is larger than the third preset current, stopping the inverter to supply power to the load. The current is read again after time delay and compared with the third preset current, so that the condition that the impact current is small is eliminated, meanwhile, the condition that the overload current is exceeded for a long time under the normal working state of the load to cause damage to the inverter is avoided, at the moment, the comparison with the overload current value is needed, if the comparison is larger than the overload current value, the load is in the normal working state, and the overload current is exceeded, and the overload protection is needed. 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 2 s. Accordingly, in order to avoid damage to the inverter caused by too long time, the delay time is not generally more than 2 s.
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. And when the current values read for multiple times are smaller than the third preset value, judging that the inverter carries no load, and displaying the load through the display circuit.
As shown in fig. 5, the overload protection method for 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, a preset current value is reasonably set to avoid the occurrence of misjudgment, if the current of the load during normal operation does not exceed the overload current, the overload protection is not started if the impact current of the load during start does not exceed the preset current value, otherwise, the overload protection is started if the impact current exceeds the preset current value, and an unnecessary protection mechanism triggered by the impact current can be effectively avoided.
Example 2: a computer readable storage medium.
A computer-readable storage medium for storing a computer program that, when invoked by a processor, implements the overload protection method of the onboard inverter of any of the above.
Example 3: an inverter is provided.
An inverter comprising a processor and a memory for storing a computer program that when invoked by the processor implements the method of overload protection for a vehicle mounted inverter of any of the above.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (10)
1. An overload protection method of a vehicle-mounted inverter is characterized in that:
reading the load current of the inverter after the inverter is connected into 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 when the comparison result shows that the load current is not less than the first preset current, stopping the inverter to supply power to the load.
2. The overload protection method for the vehicle-mounted inverter according to claim 1, wherein the first preset current is not less than 2.5 times and not more than 10 times of the overload current of the inverter.
3. The overload protection method of the vehicle-mounted inverter according to claim 1, wherein:
when the read current value is not less than the first preset current, performing time delay action;
after the time delay action is finished, reading the load current again;
comparing the load current read again with a second preset current, wherein the second preset current is set as an overload current value of the inverter;
and when the comparison result is that the load current read again is larger than the second preset current, stopping the inverter to supply power to the load.
4. The overload protection method of the vehicle-mounted inverter according to claim 3, wherein: the delay time is t1, and t1 is less than or equal to 2 s.
5. The overload protection method of the vehicle-mounted inverter according to claim 1, wherein:
comparing the load current with a third preset current when the comparison result is that the load current is smaller than the first preset current, wherein the third preset current is set as an overload current value of the inverter;
and when the comparison result shows that the load current is greater than the third preset current, stopping the inverter to supply power to the load.
6. The overload protection method of the vehicle-mounted inverter according to claim 5, wherein:
when the read current value is larger than the third preset current, performing time delay action;
after the time delay action is finished, reading the load current again;
comparing the load current read again with the third preset current;
and when the comparison result is that the load current read again is larger than the third preset current, stopping the inverter to supply power to the load.
7. The overload protection method for the vehicle-mounted inverter according to claim 6, wherein the delay time is t2, and t2 is less than or equal to 2 s.
8. The overload protection method of the vehicle-mounted inverter according to claim 5, 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.
9. A computer-readable storage medium storing a computer program, characterized in that: the computer program, when being invoked by a processor, implements the overload protection method for the onboard inverter of any one of claims 1 to 8.
10. An inverter comprising a processor and a memory for storing a computer program, characterized in that the computer program, when invoked by the processor, implements the method of overload protection for a vehicle inverter according to any one of claims 1 to 8.
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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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| 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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| CN112234583B CN112234583B (en) | 2024-01-02 |
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| US20020074974A1 (en) * | 2000-12-14 | 2002-06-20 | Kaoru Shinba | Method and apparatus for overload-controlling inverter power generation apparatus |
| 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 |
-
2020
- 2020-10-10 CN CN202011076035.5A patent/CN112234583B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020074974A1 (en) * | 2000-12-14 | 2002-06-20 | Kaoru Shinba | Method and apparatus for overload-controlling inverter power generation apparatus |
| 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 |
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