CN110108997A - A kind of frequency converter self checking method - Google Patents
A kind of frequency converter self checking method Download PDFInfo
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- CN110108997A CN110108997A CN201910281175.7A CN201910281175A CN110108997A CN 110108997 A CN110108997 A CN 110108997A CN 201910281175 A CN201910281175 A CN 201910281175A CN 110108997 A CN110108997 A CN 110108997A
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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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2621—Circuits therefor for testing field effect transistors, i.e. FET's
Abstract
The present embodiments relate to converter technology fields, disclose a kind of frequency converter self checking method, comprising: send the first pulse train to main circuit of converter, judge whether there is IGBT and short circuit occurs；M IGBT is selected from lower bridge arm, makes one of IGBT open-minded every time, and the IGBT for being in another phase in bridge arm with the IGBT currently opened upwards sends the second pulse, judges whether there is phase fault or ground short circuit；IGBT is grouped, every group includes an IGBT of a upper bridge arm and IGBT of lower bridge arm, and the two IGBT are in different bridge arms；Successively to being operated below every group of execution: keeping the IGBT of lower bridge arm open-minded, the IGBT of upward bridge arm sends third pulse；Three-phase output current value is obtained, and according to the size relation of three-phase output current value and predetermined current threshold, determines every group of detecting state value；According to the detecting state value of each group, judges whether there is IGBT and open a way.
Description
Technical field
The present embodiments relate to converter technology field, in particular to a kind of frequency converter self checking method.
Background technique
Frequency converter is to be handed over using converter technique and microelectric technique by changing motor frequency mode of working power supply to control
The electric control appliance of galvanic electricity motivation.Specifically, frequency converter is mainly the on-off of IGBT close to the inner portion to adjust out-put supply
Voltage and frequency, and supply voltage required for providing it according to the actual needs of motor, to reach the mesh of energy conservation, speed regulation
's.In addition, frequency converter can also offer multi-protective function, such as overcurrent protection, overvoltage protection and overload protection.Therefore,
Along with the continuous improvement of industrial automatization, frequency converter is also widely used in every field.
At the same time, it was found by the inventors of the present invention that frequency converter in use, can often exist field connection it is improper,
The situation of the IGBT main device damage of cable bad, motor damage or even frequency converter itself.Therefore, after frequency converter powers on or
For person before operating to electrical power, carrying out self-test appropriate to entire connection circuit prevents failure to orient fault point in time
Phenomenon expands and further deteriorates, aircraft bombing phenomenon even occurs, just becomes particularly important.
But current many frequency converters do not have power-on self-test function, or only have simple self-checking function, such as only
Detect shorted to earth etc..And it is as described above, if not carrying out abundant self-test to frequency converter before to electrical power, using
When, slight failure may be further magnified and deteriorate, and some evitable failures may be caused as aircraft bombing
Loss.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of frequency converter self checking method, can be before electrical power, to change
Frequency device itself and rear class motor connection part carry out preliminary examination, facilitate timely fault point, prevent the further expansion of failure
With deterioration, avoid causing bigger damage.
In order to solve the above technical problems, embodiments of the present invention provide a kind of dominant frequency device self checking method, it is applied to master
Control chip, comprising: in the case where frequency converter does not connect load, into main circuit of converter, each IGBT successively sends the first pulse,
Short circuit occurs to judge whether there is IGBT；Wherein, the IGBT for not receiving first pulse currently is in off state；Becoming
In the case where the connection load of frequency device, M IGBT is arbitrarily selected from each IGBT of lower bridge arm；Make in the M IGBT every time
One of IGBT is open-minded, and all IGBT for being in another phase in bridge arm with the IGBT currently opened upwards send the second pulse,
To judge whether there is phase fault or ground short circuit；Wherein, the M is greater than or equal to 2；IGBT each in main circuit is divided
Group, every group includes an IGBT in a upper bridge arm and IGBT in lower bridge arm, and is in another phase with two IGBT of group；
Successively to being operated below every group of execution: keeping the IGBT of lower bridge arm open-minded, the IGBT of upward bridge arm sends third pulse, and gradually increases
The width of the big third pulse is to preset value；Three-phase output current value is obtained, and according to the three-phase output current value and in advance
If the size relation of current threshold, current detecting state value is determined；According to every group of corresponding detecting state value, judgement is
It is no to there is IGBT to open a way.
Further, in described the step of successively sending the first pulse to each IGBT of main circuit of converter, first successively to
Each IGBT of lower bridge arm sends first pulse, then each IGBT of bridge arm sends first pulse upwards in turn.
Further, before each IGBT of upward bridge arm sends first pulse, the method also includes: to lower bridge
All IGBT of arm carry out boostrap circuit charging.
Further, the duty ratio width of first pulse is fixed value, alternatively, the duty ratio of first pulse is wide
Degree is gradually increased with the time.
Further, in described the step of successively sending the first pulse to each IGBT of main circuit of converter, each described
The main circuit is disposably sent to after one pulse is combined, alternatively, each first pulse is with single step pulse manual mode hair
It send to the main circuit.
Further, the IGBT each into main circuit of converter successively sends the first pulse, to judge whether there is IGBT
Short circuit occurs, specifically includes: during sending first pulse to any one IGBT, if receiving over-current signal, sentencing
Short circuit occurs for the fixed another IGBT for being in same bridge arm with IGBT that is currently receiving first pulse；Wherein, the overcurrent letter
Number from driving circuit or current sample conditioning circuit；The driving circuit connects the control terminal of each IGBT, and in bridge arm
When there is overcurrent, Xiang Suoshu main control chip sends over-current signal；Each phase of the over-sampling modulate circuit connection main circuit of converter
Output end, and in any one phase output overcurrent, Xiang Suoshu main control chip sends over-current signal.
Further, the duty ratio width of second pulse is fixed value, alternatively, the duty ratio of second pulse is wide
Degree is gradually increased with the time.
Further, described to make one of IGBT in the M IGBT open-minded every time, and upwards in bridge arm and currently
All IGBT that the IGBT opened is in another phase send the second pulse, to judge whether there is phase fault or ground short circuit, tool
Body includes: to keep any one IGBT in the M IGBT open-minded, and be in another with the IGBT currently opened in bridge arm upwards
During all IGBT of phase send the second pulse, if receiving over-current signal or shorted to earth signal, determine that there are alternate short
Road or ground short circuit；Wherein, the over-current signal is from driving circuit or current sample conditioning circuit；The driving circuit connects
When connecing the control terminal of each IGBT, and overcurrent occur in bridge arm, Xiang Suoshu main control chip sends over-current signal；The sampling conditioning
Each phase output terminal of circuit connection main circuit of converter, and in any one phase output overcurrent, Xiang Suoshu main control chip is transmitted across
Flow signal；The shorted to earth signal connects the electricity from earth fault detection circuit, the earth fault detection circuit
Stream sampling conditioning module judges whether there is shorted to earth by calculating zero-sequence current, and when being determined with shorted to earth, to institute
It states main control chip and sends the shorted to earth signal.
Further, described according to every group of corresponding detecting state value, it judges whether there is IGBT and opens a way, specifically
It include: that IGBT hair by inquiring IGBT open-circuit fault state table, is judged whether there is according to the corresponding detecting state value of each group
Raw open circuit.
Embodiment of the present invention in terms of existing technologies, on the one hand at the scene when, can be right to before electrical power
Frequency converter and rear class motor connection part carry out preliminary examination, prevent from causing frequency converter to damage because of the problem of field connection, can also be right
Frequency converter flaw itself is judged, is prevented the amplification of frequency converter minor failure from deteriorating, is led to frequency converter aircraft bombing accident, is caused tighter
The personal injury of weight and bigger property injure (such as fire).On the other hand, the method can be used for frequency converter production inspection
Survey process, the classification and specific module that the main circuit of converter that can quickly position breaks down improve frequency converter production detection effect
Rate and accuracy rate.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the electrical block diagram for the frequency converter self-checking system that embodiment of the present invention provides；
Fig. 2 is the flow chart for the frequency converter self checking method that embodiment of the present invention provides；
Fig. 3 is the schematic diagram that the main control chip that embodiment of the present invention provides sends the first pulse to each IGBT；
Fig. 4 is the schematic diagram that the T2 that embodiment of the present invention provides opened and exported to T1, T3 the second pulse；
Fig. 5 is that the T4 that embodiment of the present invention provides is open-minded, and the schematic diagram of the second pulse is exported to T3, T5；
Fig. 6 is the T2 that opens of embodiment of the present invention offer, and the schematic diagram of third pulse is exported to T1；
Fig. 7 is the T6 that opens of embodiment of the present invention offer, and the schematic diagram of third pulse is exported to T1；
Fig. 8 is the T2 that opens of embodiment of the present invention offer, and the schematic diagram of third pulse is exported to T3；
Fig. 9 is the T4 that opens of embodiment of the present invention offer, and the schematic diagram of third pulse is exported to T3；
Figure 10 is the T6 that opens of embodiment of the present invention offer, and the schematic diagram of third pulse is exported to T5；
Figure 11 is the T4 that opens of embodiment of the present invention offer, and the schematic diagram of third pulse is exported to T5.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details
And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
Embodiment of the present invention is related to a kind of frequency converter self checking method.The self checking method is based on frequency converter as shown in Figure 1
Self-checking system, the system include main control chip, main circuit of converter, driving circuit, over-current detection circuit, shorted to earth detection electricity
Road and current sample conditioning circuit；Specifically, main circuit of converter is the three phase inverter bridge being made of 6 IGBT, 6 IGBT
Respectively T1, T2, T3 ... T6, wherein T1, T3, T5 are three IGBT of upper bridge arm, and T2, T4, T6 are three of lower bridge arm
IGBT.One end of driving circuit is respectively connected to the control terminal of each IGBT, and the other end is connected to main control chip (such as single-chip microcontroller).One
Aspect, main control chip can control opening and turning off for each IGBT by driving circuit；On the other hand, in this embodiment party, driving electricity
When overcurrent occurs in bridge arm in the optocoupler used in road, it can export and move back saturation signal, which can be used as over-current signal, pass through
Current detection circuit feeds back to main control chip.Current sample conditioning circuit connects the output end of each phase of main circuit of converter UWV, can use
In the output electric current for sampling each phase, on the one hand, current sample conditioning circuit can be calculated by gain appropriate and biasing, will be sampled
Current regulating to the acceptable level of main control chip, and be sent to main control chip；On the other hand, current sample conditioning circuit can
According to the electric current of sampling, judge that each phase output whether there is flow problem, and when determination had flow problem, examine by overcurrent
Slowdown monitoring circuit sends over-current signal to main control chip.It can be seen that either overcurrent occurs in bridge arm, or each mutually output existed
Stream, main control chip can all receive over-current signal.In addition, it is noted that in one embodiment, driving circuit exports
Over-current signal and current sample conditioning circuit output over-current signal can be exported by over-current detection module to main control chip
Same detection interface (as shown in Figure 1)；In another embodiment, the over-current signal and current sample of driving circuit output improve
The over-current signal of circuit output can also be exported respectively to the different detection interface (not shown)s of main control chip, such master control core
Piece can determine the specific location of overcurrent according to the corresponding detection interface of over-current signal.One end of earth fault detection circuit connects
Current sample conditioning circuit is connect, the output electric current read group total zero sequence for the three-phase for being used to sample current sample conditioning circuit
Electric current sends shorted to earth letter to judge whether frequency conversion output has shorted to earth phenomenon, and when determining has shorted to earth generation
Number to main control chip.
In general, embodiment of the present invention mainly keeps 6 IGBT in main circuit of converter open-minded according to certain rules
And shutdown, and the current sampling data of over-current signal, shorted to earth signal and three-phase output is combined, whether comprehensive descision has IGBT
The problems such as short circuit, open circuit occurs, or whether there is phase fault or shorted to earth.It is asked detecting the presence of any of the above one
When topic, all IGBT can be blocked immediately by main control chip or other peripheral circuits, and control frequency converter and show screen display pair
The fault code or state code answered.
The frequency converter self checking method that embodiment of the present invention provides is applied to main control chip, detailed process such as Fig. 2 institute
Show, comprising:
Step S101: in the case where frequency converter does not connect load, into main circuit of converter, each IGBT successively sends first
To judge whether there is IGBT short circuit occurs for pulse.
Specifically, main control chip is when successively sending the first pulse to each IGBT, in a kind of embodiment party in step S101
In formula, the first pulse successively first can be sent to each IGBT of lower bridge arm (i.e. T2, T4, T6), then each IGBT of bridge arm is (i.e. upwards in turn
T1, T3, T5) send the first pulse.In another embodiment, can each IGBT of upward bridge arm send the first pulse it
Before, increase the process of boostrap circuit charging, i.e., before each IGBT of upward bridge arm sends the first pulse, by three of upper bridge arm
IGBT is all off, and sends the pulse (as shown in Figure 3) that duty ratio is 100% to three IGBT of lower bridge arm simultaneously.It is worth
One is mentioned that, when upward bridge arm or three IGBT of lower bridge arm send the first pulse, the sequence for sending the first pulse can be adjusted
Whole, embodiment of the present invention with no restrictions, such as can be by the sequence of T2, T4, T6, can also be by the sequence of T4, T6, T2.
In addition, only currently receiving the IGBT of the first pulse in arteries and veins when successively successively sending the first pulse to each IGBT
Opening state is in during punching, the other IGBT for not receiving the first pulse currently are in off state.For example, main control chip exists
When sending the first pulse to T4, T4 can be opened during pulse, and other all IGBT are all in off state.
In addition, being sent to the first pulse of each IGBT, it is disposably sent to main circuit after can combining, alternatively, each first
Pulse is sent to main circuit with single step pulse manual mode.In practical applications, the duty ratio width of the first pulse can be solid
Definite value (such as 10us) gradually can also up be incremented by from small to large with the time, and adjacent pulse has to wait for sufficiently long interval
Time, this method process of self-test is although long, but also safer.
In this step, main control chip is during sending the first pulse to any one IGBT, if main control chip receives
Over-current signal then can determine that short circuit occurs for another IGBT that same bridge arm is in the IGBT for currently receiving the first pulse.This is
Because overcurrent has occurred when only one IGBT is opened, it is most likely to occur bridge arm direct pass or shorted to earth phenomenon, at this time may be used
To judge another IGBT of same bridge arm for short circuit.For example, main control chip received during sending the first pulse to T4
Signal is flowed, then can determine that T1 short circuit, at this point, all IGBT should be blocked immediately, frequency converter shows fault code.
Below the process of this step will be specifically introduced by taking Fig. 3 as an example:
1) frequency converter PWM cycle is set as 125us, i.e. switching frequency is 8kHz.
2) the first pulse (i.e. Pulse1 in Fig. 3) is exported to T4 pipe, other IGBT shutdown；Judge whether there is overcurrent and right
Ground short circuit signal occurs.In case of overcurrent, determine that T1 pipe is short circuit, while blocking all IGBT immediately, frequency converter display event
Hinder code.If normal, go in next step.
3) the first pulse, other IGBT shutdown are exported to T6 pipe；It judges whether there is overcurrent and shorted to earth signal occurs.Such as
Overcurrent occurs for fruit, determines that T3 pipe is short circuit, while blocking all IGBT immediately, frequency converter shows fault code.If normal, turn
To in next step.
4) the first pulse, other IGBT shutdown are exported to T2 pipe；Judge whether there is overcurrent.In case of overcurrent, sentence
T5 pipe is determined for short circuit, while blocking all IGBT immediately, and frequency converter shows fault code.If normal, go in next step.
5) simultaneously to T4, T6, the T2 pulse that output duty cycle is 100% simultaneously, other IGBT shutdown；This step is mainly
For the frequency converter using bootstrapping driving method, need that three upper arm IGBT bootstrap power supplies is made to complete self-charging.
6) the first pulse, other IGBT shutdown are exported to T1 pipe；It judges whether there is overcurrent and shorted to earth signal occurs.Such as
Overcurrent occurs for fruit, determines that T4 is short circuit, while blocking all IGBT immediately, frequency converter shows fault code.If normal, go to
In next step.
7) the first pulse, other IGBT shutdown are exported to T3 pipe；It judges whether there is overcurrent and shorted to earth signal occurs.Such as
Overcurrent occurs for fruit, determines that T6 is short circuit, while blocking all IGBT immediately, frequency converter shows fault code.If normal, go to
In next step.
8) the first pulse, other IGBT shutdown are exported to T5 pipe；It judges whether there is overcurrent and shorted to earth signal occurs.Such as
Overcurrent occurs for fruit, determines that T2 pipe is short circuit, while blocking all IGBT immediately, frequency converter shows fault code.If normal, turn
To in next step.
9) restore the setting of main control chip PWM peripheral hardware register.
Step S102: in the case where frequency converter is connected and loaded, M IGBT is arbitrarily selected from each IGBT of lower bridge arm；
Make one of IGBT in the M IGBT open-minded every time, and is in another phase with the IGBT currently opened in bridge arm upwards
All IGBT send the second pulse, to judge whether there is phase fault or ground short circuit.
The duty ratio width of second pulse may be fixed value (such as 10us), or as the time gradually increases from small to large
Add.
In this step, keep any one IGBT in M IGBT open-minded, and upwards in bridge arm with the IGBT that currently opens
During all IGBT in another phase send the second pulse, if receiving over-current signal or shorted to earth signal, determine exist
Phase fault or ground short circuit.
Specifically, M can be 2 or 3, will be illustrated so that M is equal to 2 as an example below, i.e., from each IGBT of lower bridge arm
Select 2 IGBT.For example 2 IGBT selected are T2, T4.It can first make T2 open-minded, other IGBT are turned off, and upwards in bridge arm
The second pulse (sending the second pulse to T1, T3) is sent with the T2 all IGBT for being in another phase, as shown in Figure 4.In pulse period
Between, if main control chip receives over-current signal or shorted to earth signal, so that it may determine that there are phase fault or ground short circuits；It is no
Then, so that it may open T4, other IGBT are turned off, and send the second pulse to T3, T5, as shown in Figure 5.
It will be below T2, T4 with the IGBT of the 2 of selection lower bridge arms, illustrate the process of this step:
1) PWM cycle is set as 125us, turns off all IGBT.
2) it forces to open T2, go in next step.
3) the second pulse (i.e. Pulse2 in Fig. 4) is exported to T1, T3, judges whether there is overcurrent and shorted to earth signal hair
It is raw.In case of overcurrent or shorted to earth, then illustrate that phase fault or ground short circuit has occurred in frequency converter output, short circuit occurs
Between UW and VW, while all IGBT are blocked immediately, frequency converter shows fault code.If normal, go in next step.
4) all IGBT are turned off, are gone in next step.
5) it forces to open T4, go in next step.
6) the second pulse ((i.e. Pulse3 in Fig. 5)) is exported to T3, T5, judges whether there is overcurrent and shorted to earth signal
Occur.In case of overcurrent or shorted to earth, illustrate that phase fault or ground short circuit has occurred in frequency converter output, short circuit occurs
Between UV and UW, while all IGBT are blocked immediately, frequency converter shows fault code.If normal, go in next step.
7) restore the setting of main control chip PWM peripheral hardware register.
Step S103: being grouped IGBT each in main circuit, and every group includes an IGBT and lower bridge in upper bridge arm
An IGBT in arm, and another phase is in two IGBT of group；Successively to being operated below every group of execution: making the IGBT of lower bridge arm
Open-minded, the IGBT of upward bridge arm sends third pulse, and is gradually increased the width of the third pulse to preset value；Obtain three-phase
Output current value, and according to the size relation of the three-phase output current value and predetermined current threshold, determine current detection shape
State value.
Specifically, 6 IGBT can be divided into 6 groups by this step, it is respectively as follows: T1 and T2, T1 and T6, T3 and T2, T3 and T4,
T5 and T6, T5 and T4.Hereafter, the detecting state value that can successively determine every group, by taking the group where T1 and T2 as an example, Yao Kaitong T2,
Third pulse is exported to T1 simultaneously, and gradually increases the width of third pulse to preset value (such as 100%).Period will read three
Mutually output electric current, and judge that three-phase output electric current and the size of predetermined current threshold (can be the 15% of load rated current) close
System, with the current detecting state value of determination.If three-phase output electric current is both less than preset current threshold, current inspection can determine
Survey state value IgbtOpenState.bit0=1；If three-phase, which exports electric current, is greater than or equal to preset current threshold, this is exited
Pace pulse is transferred to next pace pulse, and IgbtOpenState.bit0=0 at this time.
The detailed process of this step is as follows:
1) PWM cycle is set as 125us, turns off all IGBT.
2) as shown in fig. 6, forcing to open T2, third pulse (Pulse3 i.e. in figure) is exported to T1, is stepped up third
The accounting sky width of pulse, until duty ratio width reaches 100%, during which 3 phases of reading export the AD value of electric current, if three-phase is defeated
Electric current is both less than preset current threshold out, then IgbtOpenState.bit0=1, if three-phase output electric current is greater than or equal in advance
If current threshold, then exit the pace pulse, be transferred to next pace pulse, and IgbtOpenState.bit0=0 at this time.
3) all IGBT are turned off.
4) as shown in fig. 7, forcing to open T6, third pulse is exported to T1, is stepped up the accounting sky width of third pulse,
Until duty ratio width reaches 100%, during which the AD value of 3 phases of reading output electric current, presets if three-phase output electric current is both less than
Current threshold, then IgbtOpenState.bit1=1, if three-phase output electric current is greater than or equal to preset current threshold,
The pace pulse is exited, next pace pulse is transferred to, and IgbtOpenState.bit1=0 at this time.
5) all IGBT are turned off.
6) as shown in figure 8, forcing to open T2, third pulse is exported to T3, is stepped up the accounting sky width of third pulse,
Until duty ratio width reaches 100%, during which the AD value of 3 phases of reading output electric current, presets if three-phase output electric current is both less than
Current threshold, then IgbtOpenState.bit2=1, if three-phase output electric current is greater than or equal to preset current threshold,
The pace pulse is exited, next pace pulse is transferred to, and IgbtOpenState.bit2=0 at this time.
7) all IGBT are turned off.
8) as shown in figure 9, forcing to open T4, third pulse is exported to T3, is stepped up the accounting sky width of third pulse,
Until duty ratio width reaches 100%, during which the AD value of 3 phases of reading output electric current, presets if three-phase output electric current is both less than
Current threshold, then IgbtOpenState.bit3=1, if three-phase output electric current is greater than or equal to preset current threshold,
The pace pulse is exited, next pace pulse is transferred to, and IgbtOpenState.bit3=0 at this time.
9) all IGBT are turned off.
10) it as shown in Figure 10, forces to open T6, exports third pulse to T5, the accounting for being stepped up third pulse is empty wide
Degree, until duty ratio width reaches 100%, during which 3 phases of reading export the AD value of electric current, if three-phase output electric current is both less than pre-
If current threshold, then IgbtOpenState.bit4=1, if three-phase output electric current is greater than or equal to preset current threshold,
The pace pulse is then exited, next pace pulse is transferred to, and IgbtOpenState.bit4=0 at this time.
11) all IGBT are turned off.
12) it as shown in figure 11, forces to open T4, exports third pulse to T5, the accounting for being stepped up third pulse is empty wide
Degree, until duty ratio width reaches 100%, during which 3 phases of reading export the AD value of electric current, if three-phase output electric current is both less than pre-
If current threshold, then IgbtOpenState.bit5=1, if three-phase output electric current is greater than or equal to preset current threshold,
The pace pulse is then exited, next pace pulse is transferred to, and IgbtOpenState.bit5=0 at this time.
Step S104: it according to every group of corresponding detecting state value, judges whether there is IGBT and opens a way.
After determining every group of detecting state value, IGBT can be judged whether there is by inquiring IGBT open-circuit fault state table
It opens a way.It is not difficult to find that after obtaining 6 groups of corresponding detecting state values, if 6 groups of detecting state values and IGBT open-circuit fault shape
In state table any one group with * it is identical, indicate that in the presence of open circuit, and can determine the specifically IGBT that opens a way.For example obtain 6 groups
Corresponding detecting state value is respectively as follows: IgbtOpenState.bit0=0, IgbtOpenState.bit1=0,
IgbtOpenState.bit2=1, IgbtOpenState.bit3=1, IgbtOpenState.bit4=0,
IgbtOpenState.bit5=0；This is identical as the 12nd group in table, just can determine that T3 opens a way at this time.
Open-circuit fault state table is as follows:
Embodiment of the present invention in terms of existing technologies, on the one hand at the scene when, can be right to before electrical power
Frequency converter and rear class motor connection part carry out preliminary examination, prevent from causing frequency converter to damage because of the problem of field connection, can also be right
Frequency converter flaw itself is judged, is prevented the amplification of frequency converter minor failure from deteriorating, is led to frequency converter aircraft bombing accident, is caused tighter
The personal injury of weight and bigger property injure (such as fire).On the other hand, the method can be used for frequency converter production inspection
Survey process, the classification and specific module that the main circuit of converter that can quickly position breaks down improve frequency converter production detection effect
Rate and accuracy rate.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (9)
1. a kind of frequency converter self checking method, which is characterized in that be applied to main control chip, comprising:
In the case where frequency converter does not connect load, into main circuit of converter, each IGBT successively sends the first pulse, is with judgement
It is no to have IGBT that short circuit occurs；Wherein, the IGBT for not receiving first pulse currently is in off state；
In the case where frequency converter is connected and loaded, M IGBT is arbitrarily selected from each IGBT of lower bridge arm；Make the M every time
One of IGBT in IGBT is open-minded, and is in all IGBT transmission the of another phase in bridge arm with the IGBT currently opened upwards
Two pulses, to judge whether there is phase fault or ground short circuit；Wherein, the M is greater than or equal to 2；
IGBT each in main circuit is grouped, every group includes an IGBT in upper bridge arm and one in lower bridge arm
IGBT, and another phase is in two IGBT of group；Successively to being operated below every group of execution: keeping the IGBT of lower bridge arm open-minded, upwards
The IGBT of bridge arm sends third pulse, and is gradually increased the width of the third pulse to preset value；It obtains three-phase and exports electric current
Value, and according to the size relation of the three-phase output current value and predetermined current threshold, determine current detecting state value；
According to every group of corresponding detecting state value, judges whether there is IGBT and open a way.
2. frequency converter self checking method according to claim 1, which is characterized in that described to each IGBT of main circuit of converter
In the step of successively sending the first pulse,
First pulse successively first is sent to each IGBT of lower bridge arm, then each IGBT of bridge arm sends first arteries and veins upwards in turn
Punching.
3. frequency converter self checking method according to claim 1 or 2, which is characterized in that sent in each IGBT of upward bridge arm
Before first pulse, the method also includes:
Boostrap circuit charging is carried out to all IGBT of lower bridge arm.
4. frequency converter self checking method according to claim 1, which is characterized in that the duty ratio width of first pulse is
Fixed value, alternatively, the duty ratio width of first pulse is gradually increased with the time.
5. frequency converter self checking method according to claim 1, which is characterized in that described to each IGBT of main circuit of converter
In the step of successively sending the first pulse,
It is disposably sent to the main circuit after each first pulse is combined, alternatively, each first pulse is with single step arteries and veins
It rushes manual mode and is sent to the main circuit.
6. frequency converter self checking method according to claim 1, which is characterized in that the IGBT each into main circuit of converter
The first pulse is successively sent, short circuit occurs to judge whether there is IGBT, specifically includes:
During sending first pulse to any one IGBT, if receiving over-current signal, determine to receive institute with current
The IGBT for stating the first pulse is in another IGBT generation short circuit of same bridge arm；
Wherein, the over-current signal is from driving circuit or current sample conditioning circuit；The driving circuit connects each IGBT
Control terminal, and when there is in bridge arm overcurrent, Xiang Suoshu main control chip sends over-current signal；The over-sampling modulate circuit connection
Each phase output terminal of main circuit of converter, and in any one phase output overcurrent, Xiang Suoshu main control chip sends over-current signal.
7. frequency converter self checking method according to claim 1, which is characterized in that the duty ratio width of second pulse is
Fixed value, alternatively, the duty ratio width of second pulse is gradually increased with the time.
8. frequency converter self checking method according to claim 1, which is characterized in that described to make in the M IGBT every time
One of IGBT is open-minded, and all IGBT for being in another phase in bridge arm with the IGBT currently opened upwards send the second pulse,
To judge whether there is phase fault or ground short circuit, specifically include:
Keep any one IGBT in the M IGBT open-minded, and is in another phase with the IGBT currently opened in bridge arm upwards
All IGBT send the second pulse during, if receiving over-current signal or shorted to earth signal, determine there are phase faults
Or ground short circuit；
Wherein, the over-current signal is from driving circuit or current sample conditioning circuit；The driving circuit connects each IGBT
Control terminal, and when there is in bridge arm overcurrent, Xiang Suoshu main control chip sends over-current signal；The over-sampling modulate circuit connection
Each phase output terminal of main circuit of converter, and in any one phase output overcurrent, Xiang Suoshu main control chip sends over-current signal；
The shorted to earth signal connects the electric current and adopts from earth fault detection circuit, the earth fault detection circuit
Sample conditioning module judges whether there is shorted to earth by calculating zero-sequence current, and when being determined with shorted to earth, to the master
It controls chip and sends the shorted to earth signal.
9. frequency converter self checking method according to claim 1, which is characterized in that described according to every group of corresponding detection
State value judges whether there is IGBT and opens a way, specifically includes:
IGBT hair is judged whether there is by inquiring IGBT open-circuit fault state table according to the corresponding detecting state value of each group
Raw open circuit.
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| CN113007084A (en) * | 2021-02-26 | 2021-06-22 | 青岛海尔空调电子有限公司 | Compressor fault early warning method and device |
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