CN116613710A - Method for judging power device circuit breaking - Google Patents
Method for judging power device circuit breaking Download PDFInfo
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- CN116613710A CN116613710A CN202310563794.1A CN202310563794A CN116613710A CN 116613710 A CN116613710 A CN 116613710A CN 202310563794 A CN202310563794 A CN 202310563794A CN 116613710 A CN116613710 A CN 116613710A
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- Prior art keywords
- phase
- power device
- peak value
- absolute value
- current
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- 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
- H02H7/1225—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 internal faults, e.g. shoot-through
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
According to the judging method of the open circuit of the power device, through collecting the current of each phase of the three-phase motor, if the absolute value of the positive peak value of the current of the same phase is smaller than half of the absolute value of the negative peak value, the upper power device of the phase is open circuit; if the absolute value of the positive peak value of the current in the same phase is larger than twice the absolute value of the negative peak value, the lower power device of the phase is disconnected; if the peak value absolute value of the phase with the smallest peak value absolute value is smaller than half of the peak value absolute value of the phase with the largest peak value absolute value, the upper power device and the lower power device of the phase with the smallest peak value absolute value are disconnected; if the peak value of any phase of current is smaller than the threshold value, the upper power device and the lower power device of at least two phases of the three phases are disconnected; if the power device is broken, the shutdown protection is carried out, the problem that the three-phase motor is continuously used under the abnormal condition of the power device in the prior art is solved, and the method is suitable for detecting the faults of the variable-frequency three-phase motor.
Description
Technical Field
The application relates to the technical field of motor drive, in particular to a judging method for power device disconnection.
Background
The core of the control system of the household appliances with motor equipment such as variable frequency refrigerators, air conditioners and the like is a compressor. At present, six power devices are controlled to be conducted or cut off by six paths of PWM signals to generate three-phase sinusoidal current with variable frequency, the three-phase sinusoidal current is input into a stator of a three-phase motor, variable frequency driving of the three-phase motor is achieved, and the power devices can be IGBT (insulated gate bipolar transistor) or MOS (metal oxide semiconductor) tubes or IPM (intelligent power module).
In the variable frequency control process, if some power devices are broken, the motor can still operate and is in an abnormal working state, the current protection module cannot protect the motor, and the motor cannot be judged to be abnormal, so that the three-phase motor is continuously used under the abnormal condition of the power devices.
Disclosure of Invention
The technical problems solved by the application are as follows: the method for judging the disconnection of the power device solves the problem that in the prior art, a three-phase motor is continuously used under the abnormal condition of the power device.
The application solves the technical problems by adopting the technical scheme that: the judging method of the open circuit of the power device is applied to controlling the on/off of six power devices by using six paths of PWM signals to generate three-phase sinusoidal current with variable frequency to be input into a stator of a three-phase motor, so as to realize variable frequency driving of the three-phase motor, wherein each phase of the three-phase motor comprises an upper power device and a lower power device, and the judging method comprises the following steps:
s01, collecting current of each phase of the three-phase motor;
s02, judging whether the power device is disconnected according to the current peak value,
if the absolute value of the positive peak value of the current in the same phase is smaller than half of the absolute value of the negative peak value, the upper power device of the phase is disconnected;
if the absolute value of the positive peak value of the current in the same phase is larger than twice the absolute value of the negative peak value, the lower power device of the phase is disconnected;
if the peak value absolute value of the phase with the smallest peak value absolute value is smaller than half of the peak value absolute value of the phase with the largest peak value absolute value, the upper power device and the lower power device of the phase with the smallest peak value absolute value are disconnected;
if the peak value of any phase of current is smaller than the threshold value, the upper power device and the lower power device of at least two phases of the three phases are disconnected;
s03, if the power device is broken, stopping protection is performed.
Further, the threshold is lower than the phase current at which the three-phase motor is connected to the lightest load and at the lowest rotational speed.
Further, in S01, the glitch is filtered by a filter when the current of each phase of the three-phase motor is collected.
The application has the beneficial effects that: according to the judging method for the disconnection of the power device, the current of each phase of the three-phase motor is collected, whether the power device is disconnected or not is judged according to the current peak value, and if the power device is disconnected, the three-phase motor is stopped, so that the problem that the three-phase motor is continuously used under the abnormal condition of the power device in the prior art is solved.
Drawings
Fig. 1 is a schematic diagram of a variable frequency driving circuit in the judging method of the power device disconnection of the present application, wherein T1 to T6 represent six PWM control signals, and A, B and C represent three phases of a three-phase motor.
Fig. 2 is a flow chart of a method for judging the disconnection of the power device.
Detailed Description
For a variable frequency three-phase motor, as shown in fig. 1, for phase a, the variable frequency control circuit comprises an upper power device controlled by a PWM signal T4 and a lower power device controlled by a PWM signal T1, for phase B, the variable frequency three-phase motor comprises an upper power device controlled by a PWM signal T5 and a lower power device controlled by a PWM signal T2, for phase C, the variable frequency three-phase motor comprises an upper power device controlled by a PWM signal T6 and a lower power device controlled by a PWM signal T3, in the control process, only one of the three upper power devices can be conducted at the same time, and the corresponding lower power device of the conducted upper power device is cut off, the conduction conditions of the other two lower power devices are divided into three, namely, the conduction conditions of the power devices are respectively controlled by T4, T2 and T3, the conduction of the power devices are controlled by T5, T1 and T3, thereby, three-phase sinusoidal currents with variable frequency are generated, the three-phase sinusoidal currents are input to a three-phase motor stator, the variable frequency three-phase motor is realized, when the three-phase motor is operated, the peak currents are the same as the absolute value, and the absolute value of the peak current is the absolute value of the three-phase motor is the same, and the absolute value is the absolute value of the absolute value is the absolute value, and the absolute value of the absolute value is 2, the absolute value is the absolute value, and the absolute value is 2, based on the waveform value, and the step waveform of the method is 2, as the figure is based on the step, and the method is 2:
s01, collecting current of each phase of the three-phase motor;
specifically, when each phase of current of the three-phase motor is collected, the filter is used for filtering burr interference so as to improve the accuracy of the collected phase current.
S02, judging whether the power device is disconnected according to the current peak value,
if the absolute value of the positive peak value of the current in the same phase is smaller than half of the absolute value of the negative peak value, the upper power device of the phase is disconnected;
specifically, for phase a, if the positive peak value of the sinusoidal waveform current collected by phase a is less than half the absolute value of the negative peak value, it means that the positive current of phase a does not reach the expected value in the case of the power devices controlled by T4, T2 and T3 being turned on, and therefore, the power device controlled by T4 is not turned on, i.e. the power device controlled by T4 is in an open circuit fault,
if the absolute value of the positive peak value of the current in the same phase is larger than twice the absolute value of the negative peak value, the lower power device of the phase is disconnected;
specifically, for phase a, if the sinusoidal waveform current collected by phase a is greater than twice the absolute value of the negative peak, it is indicated that the negative current of phase a does not reach the expected value in the case of power device conduction by T5, T1 and T3 and power device conduction by T6, T1 and T2, and therefore, the power device controlled by T1 is also on, i.e. the power device controlled by T1 is in an open circuit fault.
If the peak value absolute value of the phase with the smallest peak value absolute value is smaller than half of the peak value absolute value of the phase with the largest peak value absolute value, the upper power device and the lower power device of the phase with the smallest peak value absolute value are disconnected;
specifically, for A, B and C phases, when the variable frequency three-phase motor works normally, the peak values of the currents of each phase are basically consistent, if the absolute value of the peak value of the phase a is minimum, the absolute value of the peak value of the phase C is maximum, and the absolute value of the peak value of the phase a is smaller than half of the absolute value of the peak value of the phase C, it is indicated that the current of the phase a does not reach the expectation, and then the power device controlled by T4 and the power device controlled by T1 are not conducted, i.e. the upper power device and the lower power device of the phase a are disconnected, and the absolute value of the peak value comprises a positive peak absolute value and a negative peak absolute value.
If the peak value of any phase of current is smaller than the threshold value, the upper power device and the lower power device of at least two phases of the three phases are disconnected;
specifically, the threshold is lower than the phase current of the three-phase motor connected with the lightest load and at the lowest rotation speed, if the peak value of any one phase current is smaller than the threshold, the current of each phase of the three-phase motor is expected, that is, the upper power device and the lower power device of at least two phases are not conducted, that is, the upper power device and the lower power device of at least two phases are disconnected.
S03, if the power device is broken, stopping protection is performed.
Specifically, when the power device is broken, the protection module starts shutdown protection.
In the application, for the power device being an IGBT, the G pole and the E pole of the power device being the IGBT with the open-circuit fault are short-circuited, and for the power device being the MOS tube, the G pole and the S pole of the power device being the MOS tube with the open-circuit fault are short-circuited.
Claims (3)
1. The judging method of the open circuit of the power device is applied to controlling the on/off of six power devices by using six paths of PWM signals to generate three-phase sinusoidal current with variable frequency to be input into a stator of a three-phase motor, so as to realize variable frequency driving of the three-phase motor, and each phase of the three-phase motor comprises an upper power device and a lower power device and is characterized by comprising the following steps:
s01, collecting current of each phase of the three-phase motor;
s02, judging whether the power device is disconnected according to the current peak value,
if the absolute value of the positive peak value of the current in the same phase is smaller than half of the absolute value of the negative peak value, the upper power device of the phase is disconnected;
if the absolute value of the positive peak value of the current in the same phase is larger than twice the absolute value of the negative peak value, the lower power device of the phase is disconnected;
if the peak value absolute value of the phase with the smallest peak value absolute value is smaller than half of the peak value absolute value of the phase with the largest peak value absolute value, the upper power device and the lower power device of the phase with the smallest peak value absolute value are disconnected;
if the peak value of any phase of current is smaller than the threshold value, the upper power device and the lower power device of at least two phases of the three phases are disconnected;
s03, if the power device is broken, stopping protection is performed.
2. The method of claim 1, wherein the threshold is lower than a phase current at which the three-phase motor is connected to a lightest load and at a lowest rotational speed.
3. The method according to claim 1 or 2, wherein in S01, the glitch is filtered by a filter when collecting the current of each phase of the three-phase motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310563794.1A CN116613710A (en) | 2023-05-18 | 2023-05-18 | Method for judging power device circuit breaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310563794.1A CN116613710A (en) | 2023-05-18 | 2023-05-18 | Method for judging power device circuit breaking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116613710A true CN116613710A (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310563794.1A Pending CN116613710A (en) | 2023-05-18 | 2023-05-18 | Method for judging power device circuit breaking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117970106A (en) * | 2024-03-28 | 2024-05-03 | 比亚迪股份有限公司 | Motor abnormality detection method, storage medium, controller and vehicle |
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2023
- 2023-05-18 CN CN202310563794.1A patent/CN116613710A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117970106A (en) * | 2024-03-28 | 2024-05-03 | 比亚迪股份有限公司 | Motor abnormality detection method, storage medium, controller and vehicle |
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