CN107276039B - A kind of inverter current sensor fault diagnosis and processing method - Google Patents

A kind of inverter current sensor fault diagnosis and processing method Download PDF

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Publication number
CN107276039B
CN107276039B CN201710717183.2A CN201710717183A CN107276039B CN 107276039 B CN107276039 B CN 107276039B CN 201710717183 A CN201710717183 A CN 201710717183A CN 107276039 B CN107276039 B CN 107276039B
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CN
China
Prior art keywords
current sensor
current
inverter
driving
motor
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CN201710717183.2A
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Chinese (zh)
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CN107276039A (en
Inventor
章琴
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济南朗瑞电气有限公司
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Publication of CN107276039A publication Critical patent/CN107276039A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/10Emergency 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
    • H02H7/12Emergency 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
    • H02H7/122Emergency 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
    • H02H7/1227Emergency 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

Abstract

The present invention provides a kind of inverter current sensor fault diagnosis and processing methods, include the following steps:The current sensor values in AB phase line are acquired, metal-oxide-semiconductor SA, SB, SC are driven;When A phase current sensor or B phase current sensor values are greater than current protection threshold value, hardware circuit is closed by driving circuit and is exported;Non- overcurrent then removes fault message and carries out closed-loop control;It is closed and is exported by driving circuit when hardware overcurrent;After hardware overcurrent, curA is read, curB, unison counter cnt add certainly;Cnt is not greater than N then storage hardware over current fault, and cur=MIN (curA, curB) is then arranged if it is greater than N;The current value of cur such as larger than 0 current sensor acquisition is not reduced to 0, and the driving of inverter is completed by opened loop control;If cur is equal to 0, then current sensor does not damage and closes the driving of inverter.The present invention closes driving and storage hardware over current fault in hardware overcurrent;Single-chip microcontroller judges that the driving of inverter is on and off by software realization acquisition current sensor values after hardware overcurrent.

Description

A kind of inverter current sensor fault diagnosis and processing method
Technical field
The present invention relates to motor inverter technical field, especially a kind of inverter current sensor fault diagnosis and place Reason method.
Background technique
, generally there is event caused by phase line short circuit in the reason of inverter common one of failure when over current fault, over current fault Barrier, failure caused by load shock, the failure that motor needs anxious acceleration or deceleration to occur, drive system be interfered bring therefore Barrier, the parameter of electric machine match unreasonable bring failure.Over current fault can reduce inverter service life even as handled not in time Inverter is damaged, over current fault is generally judged by the current sensor in detection motor phase line.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of inverter current sensor fault diagnosis and processing sides Method, especially by control chip single-chip microcontroller, driving circuit, inverter busbar voltage VDC, metal-oxide-semiconductor SA, SB, SC and inverter Current sensor on the motor and motor AB phase line of control is realized, which is characterized in that is included the following steps:
S1:The current sensor values in AB phase line are acquired by single-chip microcontroller, control driving circuit by current sensor values, Driving circuit drives metal-oxide-semiconductor SA, SB, SC under the action of busbar voltage VDC, and motor rotates under the action of metal-oxide-semiconductor;
S2:When A phase current sensor or B phase current sensor values are greater than the current protection threshold value of motor AB phase line setting When, driving circuit can be automatically closed driving and then be closed by driving circuit and be exported;
S3:Single-chip microcontroller reads motor AB phase line excess flow fault condition status, and motor AB phase line is not if status is not 1 Overcurrent, non-overcurrent then remove the fault message of single-chip microcontroller storage inside and carry out closed-loop control to inverter by driving circuit;
S6:The motor AB phase line overcurrent if status is 1, driving circuit are automatically closed driving and then are closed by driving circuit Output is closed, AB biphase current, which will be slow, at this time is reduced to 0;
S7:After motor AB phase line overcurrent, A phase current values curA, B phase current values curB, unison counter cnt are read certainly Add;
S8:Judge whether cnt is greater than threshold value N, motor AB phase line over current fault is stored if not being greater than N, if it is greater than N It is the smaller value in curA and curB, i.e. cur=MIN (curA, curB) that phase line current cur, which is then arranged,;
S9:Further judge whether cur is greater than 0, such as larger than 0 driving circuit cutting is electric within the regular hour after exporting The current value of flow sensor acquisition is not reduced to 0, and current sensor damages at this time, and the driving of inverter is completed by opened loop control;
S10:If cur is equal to 0, then current sensor does not damage and closes the driving of inverter.
The invention has the advantages that:
The present invention realizes inverter current sensor fault diagnosis and processing by way of software and hardware combining, when hardware mistake Driving and storage hardware over current fault are closed when stream;Single-chip microcontroller acquires current sensor values by software realization and sentences after hardware overcurrent The driving of disconnected inverter is on and off.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached Figure.
Fig. 1 is inverter current sensor diagnostic provided in an embodiment of the present invention and processing hardware composition schematic diagram;
Fig. 2 is inverter current sensor fault diagnosis provided in an embodiment of the present invention and processing method flow diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of inverter current sensor fault diagnosis and processing methods, pass through such as Fig. 1 institute Show hardware composition realize, especially by control chip single-chip microcontroller, driving circuit, inverter busbar voltage VDC, metal-oxide-semiconductor SA, Current sensor realization on the motor and motor AB phase line of SB, SC and inverter control,
As shown in Fig. 2, it includes the following steps:
S1:The current sensor values in AB phase line are acquired by single-chip microcontroller, control driving circuit by current sensor values, Driving circuit drives metal-oxide-semiconductor SA, SB, SC under the action of busbar voltage VDC, and motor rotates under the action of metal-oxide-semiconductor;
S2:When A phase current sensor or B phase current sensor values are greater than the current protection threshold value of motor AB phase line setting When, driving circuit can be automatically closed driving and then be closed by driving circuit and be exported;
S3:Single-chip microcontroller reads motor AB phase line excess flow fault condition status, and motor AB phase line is not if status is not 1 Overcurrent, non-overcurrent then remove the fault message of single-chip microcontroller storage inside and carry out closed-loop control to inverter by driving circuit;
S6:The motor AB phase line overcurrent if status is 1, driving circuit are automatically closed driving and then are closed by driving circuit Output is closed, AB biphase current, which will be slow, at this time is reduced to 0;
S7:After motor AB phase line overcurrent, A phase current values curA, B phase current values curB, unison counter cnt are read certainly Add;
S8:Judge whether cnt is greater than threshold value N, motor AB phase line over current fault is stored if not being greater than N, if it is greater than N It is the smaller value in curA and curB, i.e. cur=MIN (curA, curB) that phase line current cur, which is then arranged,;
S9:Further judge whether cur is greater than 0, such as larger than 0 driving circuit cutting is electric within the regular hour after exporting The current value of flow sensor acquisition is not reduced to 0, and current sensor damages at this time, and the driving of inverter is completed by opened loop control;
S10:If cur is equal to 0, then current sensor does not damage and closes the driving of inverter.
The present invention realizes inverter current sensor fault diagnosis and processing by way of software and hardware combining, when hardware mistake Driving and storage hardware over current fault are closed when stream;Single-chip microcontroller acquires current sensor values by software realization and sentences after hardware overcurrent The driving of disconnected inverter is on and off.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification, It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only It is limited by claims and its full scope and equivalent.

Claims (1)

1. a kind of inverter current sensor fault diagnosis and processing method, especially by control chip single-chip microcontroller, driving circuit, Current sensor on the motor and motor AB phase line of inverter busbar voltage VDC, metal-oxide-semiconductor SA, SB, SC and inverter control It realizes, which is characterized in that include the following steps:
S1:The current sensor values in AB phase line are acquired by single-chip microcontroller, control driving circuit, driving by current sensor values Circuit drives metal-oxide-semiconductor SA, SB, SC under the action of busbar voltage VDC, and motor rotates under the action of metal-oxide-semiconductor;
S2:When A phase current sensor or B phase current sensor values are greater than the current protection threshold value of motor AB phase line setting, drive Dynamic circuit can be automatically closed driving and then be closed by driving circuit and be exported;
S3:Single-chip microcontroller reads motor AB phase line excess flow fault condition status, the non-mistake of motor AB phase line if status is not 1 Stream, non-overcurrent then remove the fault message of single-chip microcontroller storage inside and carry out closed-loop control to inverter by driving circuit;
S6:The motor AB phase line overcurrent if status is 1, driving circuit are automatically closed driving and then are closed by driving circuit defeated Out, AB biphase current will be slow and be reduced to 0 at this time;
S7:After motor AB phase line overcurrent, reads A phase current values curA, B phase current values curB, unison counter cnt and add certainly;
S8:Judge whether cnt is greater than threshold value N, stores motor AB phase line over current fault if not being greater than N, set if if it is greater than N Setting phase line current cur is the smaller value in curA and curB, i.e. cur=MIN (curA, curB);
S9:Further judge whether cur is greater than 0, electric current passes within the regular hour after such as larger than 0 driving circuit cutting output The current value of sensor acquisition is not reduced to 0, and current sensor damages at this time, and the driving of inverter is completed by opened loop control;
S10:If cur is equal to 0, then current sensor does not damage and closes the driving of inverter.
CN201710717183.2A 2017-08-21 2017-08-21 A kind of inverter current sensor fault diagnosis and processing method CN107276039B (en)

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CN201710717183.2A CN107276039B (en) 2017-08-21 2017-08-21 A kind of inverter current sensor fault diagnosis and processing method

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CN107276039B true CN107276039B (en) 2018-11-20

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103701394A (en) * 2013-12-30 2014-04-02 哈尔滨工业大学 Current-magnitude-based open-circuit failure online-diagnosis method for power tube of inverter
CN104767429A (en) * 2015-03-11 2015-07-08 西北工业大学 Brushless direct current motor power inverter power-on self-test device and self-test method
CN106019058A (en) * 2016-07-07 2016-10-12 西北工业大学 Phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method
CN106655099A (en) * 2016-11-14 2017-05-10 国网江苏省电力公司常州供电公司 Inverter power current limiting method after short circuit fault of distribution network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103701394A (en) * 2013-12-30 2014-04-02 哈尔滨工业大学 Current-magnitude-based open-circuit failure online-diagnosis method for power tube of inverter
CN104767429A (en) * 2015-03-11 2015-07-08 西北工业大学 Brushless direct current motor power inverter power-on self-test device and self-test method
CN106019058A (en) * 2016-07-07 2016-10-12 西北工业大学 Phase current analysis based three-phase full-bridge inverter open-circuit fault diagnosis method
CN106655099A (en) * 2016-11-14 2017-05-10 国网江苏省电力公司常州供电公司 Inverter power current limiting method after short circuit fault of distribution network

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