CN115296272A - Overcurrent protection method of inverter - Google Patents
Overcurrent protection method of inverter Download PDFInfo
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- CN115296272A CN115296272A CN202211220105.9A CN202211220105A CN115296272A CN 115296272 A CN115296272 A CN 115296272A CN 202211220105 A CN202211220105 A CN 202211220105A CN 115296272 A CN115296272 A CN 115296272A
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- inverter
- cnt1
- current
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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
- H02H7/1227—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 responsive to abnormalities in the output circuit, e.g. short circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses an overcurrent protection method of an inverter, which specifically comprises the following steps: s1, starting an inverter; s2, judging whether the current is limited, if so, starting to count up the CNT1, and executing S4; if not, CNT1 starts to reduce the count; s3, judging whether CNT1 is equal to or less than 0, if so, resetting CNT1, and applying the temperature T1 to the IGBT control circuit at the moment; if not, executing S4; s4, judging whether the CNT1 is more than or equal to C, and if so, recording the temperature T2 of the IGBT control circuit at the moment; s5, judging whether CNT1 is larger than or equal to C and (T2-T1) > D is true, and if so, reporting an overcurrent fault; if not, executing S6; s6, judging whether the CNT1 is more than or equal to E, if so, reporting an overcurrent fault; if not, the current process is continuously executed. By adopting the overcurrent protection method, the aim of current limiting and protection is fulfilled.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to an overcurrent protection method of an inverter.
Background
Taking the simplest single-phase inverter as an example, the current inverter overcurrent protection method is that a current signal is output to be compared with a certain voltage threshold value, a level signal is generated to be sent to a DSP, and the DSP immediately blocks PWM by judging that the signal is effective, so that the inverter is protected. It should be noted that, if the inverter is a three-phase inverter, there are three comparison signals, and the three comparison signals are processed or transmitted to the DSP pin, thereby achieving the effect of protecting the inverter. When overcurrent protection is carried out, the inverter is also provided with a current limiting threshold value, and the voltage of the current limiting threshold value is smaller than the voltage threshold value. When the output current signal reaches the current-limiting threshold value, the DSP will automatically block the current PWM and automatically open the current PWM again in the next period, which is the wave-by-wave current-limiting.
Disclosure of Invention
In view of the above, the present invention provides an overcurrent protection method for an inverter, which solves the problem that the prior art cannot realize both current limiting and inverter protection, thereby resulting in high hardware cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: an overcurrent protection method of an inverter specifically comprises the following steps:
s1, starting an inverter;
s2, judging whether the inverter is in a current limiting state, if so, starting to increase the count of the calculator CNT1, and executing S4; if not, the calculator CNT1 starts to decrement the count;
s3, judging whether CNT1 is less than or equal to 0, if so, resetting the calculator CNT1, and endowing the temperature T1 to the IGBT control circuit at the moment; if not, executing S4;
s4, judging whether the CNT1 is more than or equal to C, if so, recording the temperature T2 of the IGBT control circuit at the moment, wherein C is a first preset threshold value;
s5, judging whether CNT1 is larger than or equal to C and (T2-T1) > D is true, and if so, reporting an overcurrent fault; if not, executing S6; wherein D is a second preset threshold;
s6, judging whether the CNT1 is more than or equal to E, if so, reporting an overcurrent fault; if not, continuing to execute the current process, wherein E is a second preset threshold value.
Preferably, in S2, the specific method for determining whether the inverter is in the current limiting state is as follows:
acquiring the current output current value of the inverter, judging whether the current output current value is in a preset current threshold value, if so, enabling the inverter to be in a current limiting state, otherwise, enabling the inverter not to be in the current limiting state, and continuously executing the process of acquiring the current output current value.
Preferably, the preset current threshold is 1.7 to 2.2 times of rated current of the inverter.
Preferably, in S2, the calculator CNT1 starts to increase the count by the step A,1 us ≦ A ≦ 1000 us, the calculator CNT1 starts to decrease the count by the step B,1 us ≦ B ≦ 1000 us, and A > B.
Preferably, in S3, the temperature T1 is in a range from-99 ℃ to 200 ℃.
Preferably, in S4, the temperature T2 is in a range from-99 ℃ to 200 ℃.
Preferably, in S4, the range of the first preset threshold C is from 20ms to 500ms.
Preferably, in S5, the second preset threshold D ranges from-99 ℃ to 200 ℃.
Preferably, in S6, the third preset threshold E ranges from 20ms to 500ms.
Preferably, the third preset threshold E is greater than the first preset threshold C.
Compared with the prior art, the overcurrent protection method not only achieves the purpose of current limiting, but also achieves the purpose of protecting the inverter, and also achieves the purposes of saving hardware cost and saving precious interface resources at the periphery of the DSP.
Drawings
Fig. 1 is a control block diagram of an overcurrent protection method for an inverter according to an embodiment of the present invention;
fig. 2 is a flowchart of an overcurrent protection method for an inverter according to an embodiment of the present invention;
fig. 3 is a logic block diagram of an overcurrent protection method for an inverter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 do not limit the invention.
As shown in fig. 2 and 3, the method for overcurrent protection of an inverter provided in an embodiment of the present invention specifically includes the following steps:
s1, starting an inverter;
s2, judging whether the inverter is in a current limiting state, if so, starting to increase the counting of the calculator CNT1 (the counting step of the calculator is A, A is not less than 1 us and not more than 1000 us), and executing S4; if not, the calculator CNT1 starts to reduce the counting (the counting step of the calculator is B, B is not less than 1 us and not more than 1000 us, and A is more than B);
s3, judging whether CNT1 is equal to or less than 0, if so, resetting the calculator CNT1, and endowing the temperature T1 to the IGBT control circuit at the moment; if not, executing S4; the numerical range of the temperature T1 is-99-200 ℃;
s4, judging whether the CNT1 is more than or equal to C, if so, recording the temperature T2 of the IGBT control circuit at the moment, wherein C is a first preset threshold value; the numerical range of the temperature T2 is-99-200 ℃; the range of the first preset threshold C is 20ms to 500ms;
s5, judging whether CNT1 is larger than or equal to C and (T2-T1) > D is true, and if so, reporting an overcurrent fault; if not, executing S6; wherein D is a second preset threshold; the range of the second preset threshold value D is-99-200 ℃;
s6, judging whether the CNT1 is more than or equal to E, if so, reporting an overcurrent fault; if not, continuing to execute the current process, wherein E is a third preset threshold, and the range of the third preset threshold E is from 20ms to 500ms; the third preset threshold E is greater than the first preset threshold C.
In a specific implementation process, in S2, a specific method for determining whether the inverter is in the current limiting state includes: acquiring a current output current value of the inverter, judging whether the current output current value is positioned at a preset current threshold value, if so, enabling the inverter to be in a current limiting state, otherwise, enabling the inverter not to be in the current limiting state, and continuously executing a process of acquiring the current output current value; the preset current threshold value is 1.7 to 2.2 times of rated current of the inverter.
In the specific implementation process of this embodiment, as shown in fig. 1, when current limiting is performed, the output current of the inverter is compared with a preset current threshold, and software determines whether the inverter enters a current limiting state through a flag bit during the timer interrupt. If the inverter enters the current-limiting state at the moment, the counter starts to count, and the counting step length of the counter is A at the moment; if the current-limiting signal is judged not to appear in the next period through the zone bit, the counter starts to count down, the counting step length of the counter is B (A > B), if the counting value is smaller than or equal to 0 at the moment, the counter is cleared from 0, the counting is not required to be reduced, the IGBT temperature at the moment is given to T1, the value of the counter is compared with a first preset threshold value through judgment, if the value of the counter is larger than the first preset threshold value at the moment, the IGBT temperature T2 at the moment is recorded, and if the value of the counter is larger than the threshold value 3 and the temperature change rate (T2-T1) of the IGBT is larger than a second preset threshold value, the overcurrent fault is reported; or if the value of the counter is greater than a third preset threshold value (the third preset threshold value is greater than the first preset threshold value), the overcurrent fault is reported.
Finally, by adopting the overcurrent protection method, the purposes of current limiting and inverter protection are realized, and the purposes of saving hardware cost and saving precious interface resources at the periphery of the DSP are also realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An overcurrent protection method of an inverter is characterized by comprising the following steps:
s1, starting an inverter;
s2, judging whether the inverter is in a current limiting state, if so, starting to count up by the calculator CNT1, and executing S4; if not, the calculator CNT1 starts to decrement the count;
s3, judging whether CNT1 is equal to or less than 0, if so, resetting the calculator CNT1, and endowing the temperature T1 to the IGBT control circuit at the moment; if not, executing S4;
s4, judging whether the CNT1 is more than or equal to C, if so, recording the temperature T2 of the IGBT control circuit at the moment, wherein C is a first preset threshold value;
s5, judging whether CNT1 is larger than or equal to C and (T2-T1) > D is true, and if so, reporting an overcurrent fault; if not, executing S6; wherein D is a second preset threshold;
s6, judging whether the CNT1 is greater than or equal to E, if so, reporting an overcurrent fault; if not, continuing to execute the current working procedure, wherein E is a third preset threshold value.
2. The method according to claim 1, wherein in S2, the specific method for determining whether the inverter is in the current limiting state is as follows:
acquiring the current output current value of the inverter, judging whether the current output current value is in a preset current threshold value, if so, enabling the inverter to be in a current limiting state, otherwise, enabling the inverter not to be in the current limiting state, and continuously executing the process of acquiring the current output current value.
3. The method according to claim 2, wherein the predetermined current threshold is 1.7 to 2.2 times of rated current of the inverter.
4. The method of claim 3, wherein in S2, the calculator CNT1 starts to increase the count by a step A,1 us ≦ A ≦ 1000 us, the calculator CNT1 starts to decrease the count by a step B,1 us ≦ B ≦ 1000 us, and A > B.
5. The method of claim 4, wherein in S3, the temperature T1 is in a range of-99 ℃ to 200 ℃.
6. The inverter overcurrent protection method according to claim 5, wherein in S4, the temperature T2 is in a range of-99 ℃ to 200 ℃.
7. The method according to claim 6, wherein in S4, the first predetermined threshold C is in a range from 20ms to 500ms.
8. The inverter overcurrent protection method according to claim 7, wherein in the step S5, the second preset threshold D is in a range of-99 ℃ to 200 ℃.
9. The method according to claim 8, wherein in S6, the third predetermined threshold E ranges from 20ms to 500ms.
10. The method according to any one of claims 1 to 9, wherein the third predetermined threshold E is greater than the first predetermined threshold C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211220105.9A CN115296272B (en) | 2022-10-08 | 2022-10-08 | Overcurrent protection method of inverter |
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| CN202211220105.9A CN115296272B (en) | 2022-10-08 | 2022-10-08 | Overcurrent protection method of inverter |
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| CN115296272A true CN115296272A (en) | 2022-11-04 |
| CN115296272B CN115296272B (en) | 2023-01-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191383A (en) * | 2023-03-06 | 2023-05-30 | 江苏吉泰科电气有限责任公司 | Overcurrent protection method and circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539163A2 (en) * | 1991-10-23 | 1993-04-28 | Mitsubishi Denki Kabushiki Kaisha | Inverter air conditioner |
| JPH06105448A (en) * | 1992-09-21 | 1994-04-15 | Toshiba F Ee Syst Eng Kk | Switch device with protecting function |
| CN104104062A (en) * | 2014-07-25 | 2014-10-15 | 华为技术有限公司 | Over-current protection system and method of inverter circuit |
| CN107276019A (en) * | 2017-08-21 | 2017-10-20 | 合肥翔望智能科技有限公司 | A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter |
| CN114825894A (en) * | 2022-06-22 | 2022-07-29 | 锦浪科技股份有限公司 | Wave-by-wave current limiting control method and device for Heric inverter circuit and inverter |
-
2022
- 2022-10-08 CN CN202211220105.9A patent/CN115296272B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0539163A2 (en) * | 1991-10-23 | 1993-04-28 | Mitsubishi Denki Kabushiki Kaisha | Inverter air conditioner |
| JPH06105448A (en) * | 1992-09-21 | 1994-04-15 | Toshiba F Ee Syst Eng Kk | Switch device with protecting function |
| CN104104062A (en) * | 2014-07-25 | 2014-10-15 | 华为技术有限公司 | Over-current protection system and method of inverter circuit |
| CN107276019A (en) * | 2017-08-21 | 2017-10-20 | 合肥翔望智能科技有限公司 | A kind of dynamic over-current protection method of photovoltaic DC-to-AC converter |
| CN114825894A (en) * | 2022-06-22 | 2022-07-29 | 锦浪科技股份有限公司 | Wave-by-wave current limiting control method and device for Heric inverter circuit and inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191383A (en) * | 2023-03-06 | 2023-05-30 | 江苏吉泰科电气有限责任公司 | Overcurrent protection method and circuit |
| CN116191383B (en) * | 2023-03-06 | 2023-09-29 | 江苏吉泰科电气有限责任公司 | Overcurrent protection method and circuit |
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| CN115296272B (en) | 2023-01-06 |
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