CN109541334A - Frequency converter test method and test device - Google Patents
Frequency converter test method and test device Download PDFInfo
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- CN109541334A CN109541334A CN201710872816.7A CN201710872816A CN109541334A CN 109541334 A CN109541334 A CN 109541334A CN 201710872816 A CN201710872816 A CN 201710872816A CN 109541334 A CN109541334 A CN 109541334A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A kind of frequency converter test method and test device.The described method includes: obtaining the input signal to be input to frequency converter, and the input signal is tested；When the input signal meets the first preset condition, the first test result is exported, and the input signal is exported to the frequency converter, and obtain the output signal of the frequency converter, the output signal is input to the motor device being adapted to the frequency converter；Whether the output signal for detecting the frequency converter meets the second preset condition, and exports the second test result according to judging result.Using above scheme, can more accurately frequency converter whether break down, and then can more accurately replace the equipment to break down, reduce service cost.
Description
Technical field
The present invention relates to frequency converter testing fields, and in particular to a kind of frequency converter test method and test device.
Background technique
Frequency converter is using converter technique and microelectric technique, by changing motor frequency mode of working power supply, to control
The electric control appliance of ac motor is widely used on the motor devices such as compressor.
In practical applications, it is often necessary to frequency converter be tested, to confirm whether its state is normal.But current
Test method accuracy is poor.
Summary of the invention
One technical problem to be solved by the embodiment of the invention is that improving the accuracy tested frequency converter.
For this purpose, an aspect of of the present present invention provides a kind of frequency converter test method, which comprises obtain to be input to change
The input signal of frequency device, and the input signal is tested；When the input signal meets the first preset condition, output
First test result, and the input signal is exported to the frequency converter, and obtain the output signal of the frequency converter, by institute
It states output signal and is input to the motor device being adapted to the frequency converter；Whether the output signal for detecting the frequency converter meets
Two preset conditions, and the second test result is exported according to judging result.
When input signal meets the first preset condition, the output signal of frequency converter is tested, relative to only to change
Whether frequency device input signal is tested, can more accurately frequency converter break down, and then can more accurately replace
The equipment to break down, reduces service cost.
Optionally, the output signal for obtaining the frequency converter, comprising: circuit is obtained by preset output signal,
Obtain the output signal of the frequency converter.
Optionally, it includes: current detection circuit that the output signal, which obtains circuit, the output end coupling with the frequency converter
It connects, is adapted to detect for the current signal of the frequency converter output, and the current signal that will test is converted to ac voltage signal；It is whole
Current circuit, couples with the current detection circuit, and the ac voltage signal suitable for exporting the current detection circuit is converted to
D. c. voltage signal；Filter circuit is coupled with the output end of the rectification circuit, suitable for the output signal to the rectification circuit
It is filtered；And switching circuit, the output end coupling of control terminal and the filter circuit are suitable for exporting in the filter circuit
Under the control of signal conducting or by.Since switching circuit can export the letter of different voltages in the case where being connected and ending two states
Number, and then may determine that whether the output signal of frequency converter meets the second preset condition.
Optionally, the switching circuit includes: triode, the output end of the base stage of the triode and the filter circuit
Coupling, output end of the collector of the triode as the switching circuit pass through first resistor and DC power output end
Coupling, and be grounded by second resistance.Using triode as switching circuit, the structure of switching circuit can simplify, be convenient for circuit
It realizes.
Optionally, whether the output signal of the detection frequency converter meets the second preset condition, comprising: opens when described
When powered-down road is connected, determines that the output signal of the frequency converter meets second preset condition, otherwise determine the frequency converter
Output signal be unsatisfactory for second preset condition.
Optionally, it is predeterminated frequency that first preset condition, which includes: the frequency of the input signal,.I.e. in input signal
Frequency when being predeterminated frequency, then the input signal is exported to frequency converter, normal situation can be inputted guaranteeing frequency converter
Under, detect the output of frequency converter, and then based on the output of frequency converter determine frequency converter whether failure.
Optionally, the input signal obtained to be input to frequency converter, comprising: obtained by photoelectrical coupler described defeated
Enter signal.Input signal is obtained using photoelectrical coupler, it is possible to reduce the decaying of input signal improves the accuracy of detection.
Optionally, first test result and/or second test result are exported in such a way that LED light is shown.
It is possible thereby to allow users to more intuitively obtain test result.
Optionally, the flicker frequency of the LED light and the frequency of signal detected are corresponding in proportion.It is possible thereby to just
Determine whether the input signal of frequency converter and output signal are normal, are also assured that according to the flicker frequency of LED light in user
Whether frequency converter breaks down.
Optionally, before testing the input signal, further includes: the AC power source for detecting the frequency converter is defeated
Enter whether end inputs preset AC supply voltage, and exports third test result.It is defeated in the ac power input end of frequency converter
Under the premise of entering preset AC supply voltage, then the input signal and output signal of frequency converter are tested, it can be more
Accurately determine whether to break down for frequency converter, improves the accuracy of test.
Optionally, the third test result is exported in such a way that LED light is shown.It is possible thereby to more intuitively obtain
Test result.
The embodiment of the invention also provides a kind of frequency converter test device, described device includes: that input signal obtains circuit,
Output signal obtains circuit, and the control circuit of circuit and output signal acquisition circuit coupling is obtained with the input signal,
With the first output circuit and the second output circuit of control circuit coupling；Wherein: the input signal obtains circuit, is suitable for
Obtain the input signal to be input to frequency converter；The output signal obtains circuit, suitable for obtaining the output letter of the frequency converter
Number；The control circuit is tested suitable for obtaining the input signal that circuit obtains to the input signal, and in the input
When signal meets the first preset condition, the input signal is exported to the frequency converter, the first test result is generated；And it will
The output signal obtains the output signal that circuit obtains and is input to the motor device being adapted to the frequency converter, and described in detection
Whether output signal meets the second preset condition, generates the second test result；First output circuit is suitable for exporting described the
One test result；Second output circuit is suitable for exporting second test result.
Optionally, it includes: current detection circuit that the output signal, which obtains circuit, the output end coupling with the frequency converter
It connects, is adapted to detect for the current signal of the frequency converter output, and the current signal that will test is converted to ac voltage signal；It is whole
Current circuit, couples with the current detection circuit, and the ac voltage signal suitable for exporting the current detection circuit is converted to
D. c. voltage signal；Filter circuit is coupled with the output end of the rectification circuit, suitable for the output signal to the rectification circuit
It is filtered；And switching circuit, the output end coupling of control terminal and the filter circuit are suitable for exporting in the filter circuit
On or off under the control of signal.
Optionally, the switching circuit includes: triode, the output end of the base stage of the triode and the filter circuit
Coupling, output end of the collector of the triode as the switching circuit pass through first resistor and DC power output end
Coupling, and be grounded by second resistance.
Optionally, the control circuit is suitable for determining the output signal of the frequency converter when switching circuit conducting
Meet second preset condition, otherwise determines that the output signal of the frequency converter is unsatisfactory for second preset condition.
Optionally, it is predeterminated frequency that first preset condition, which includes: the frequency of the input signal,.
Optionally, it is photo-coupler that the input signal, which obtains circuit,.
Optionally, first output circuit and/or second output circuit export survey in such a way that LED light is shown
Test result.
Optionally, the flicker frequency of the LED light and the frequency of signal detected are corresponding in proportion.
Optionally, the control circuit is further adapted for before testing the output signal, detects the frequency converter
Ac power input end whether input preset AC supply voltage, and generate third test result；The frequency converter test
Device further include: third output circuit is suitable for output third test result.
Optionally, the third output circuit, suitable for exporting the third test result in such a way that LED light is shown.
Detailed description of the invention
Fig. 1 is the flow chart of frequency converter test method in one embodiment of the invention；
Fig. 2 is the electrical block diagram that output signal obtains circuit in one embodiment of the invention；
Fig. 3 is the flow chart of frequency converter test method in another embodiment of the present invention；
Fig. 4 is the structural schematic diagram of frequency converter test device in one embodiment of the invention.
Specific embodiment
Currently, usually only being tested the input signal of test frequency converter when testing frequency converter.Work as frequency conversion
The input signal of device is normal, when frequency converter and the motor device connecting with frequency converter still can not work normally, because can not be further
Determine to be specifically the failure of frequency converter or the failure of motor device, usually frequency converter and motor device need to be replaced,
Cause cost of serving higher.
In view of the above-mentioned problems, meeting first in input signal the embodiment of the invention provides a kind of frequency converter test method
When preset condition, the output signal of frequency converter is tested, relative to only testing inverter input signal, Ke Yigeng
Add and accurately judge whether frequency converter breaks down, and then can more accurately replace the equipment to break down, reduces service
Cost.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Referring to Fig.1, the embodiment of the invention provides a kind of frequency converter test method, this method may include:
Step 11, the input signal to be input to frequency converter is obtained, and the input signal is tested.
In specific implementation, the input signal to be input to frequency converter can be obtained using various ways, do not limited specifically
System.For example, the input signal of frequency converter can be obtained, by photoelectrical coupler farthest to reduce signal decaying.
In practical applications, the input signal of frequency converter is tested, i.e., whether the input signal of test frequency converter is full
The first preset condition of foot.When the input signal of frequency converter meets the first preset condition, it is possible to determine that the input of frequency conversion parent is normal,
Otherwise determine that the input of frequency converter is abnormal.
In one embodiment of this invention, it is predeterminated frequency that the first preset condition, which may include: the frequency of input signal,.With
The input signal of frequency converter be square-wave signal for, the input signal of frequency converter is tested, that is, tests the frequency of the square wave
It whether is predeterminated frequency.Wherein, which can be configured according to the practical situations of frequency converter.
Step 12, when the input signal meets the first preset condition, the first test result is exported, and by the input signal
It is input to frequency converter, and obtains the output signal of frequency converter, which is input to the motor device being adapted to frequency converter.
When input signal meets the first preset condition, show that the input of frequency converter is normal.At this point it is possible to using various ways
Export the first test result.For example, the first test result can be exported by the way of voice, it can also be using display interface
Mode exports the first test result.
In one embodiment of this invention, it in order to more intuitively obtain the first test result, can be shown using LED light
Mode export the first test result.When the input of frequency converter is normal, corresponding LED light can be set according to preset frequency
Flashing.
Wherein, the flicker frequency of LED light and the frequency of input signal are corresponding in proportion.For example, being referred to the progress of table 1
Correspondence ratio between the flicker frequency of LED light and the frequency of input signal is set.
In the normal situation of input of frequency converter, which is input to frequency converter.At this point, there are phases for frequency converter
The output answered.It obtains the output signal of frequency converter and exports the output signal to the motor device being adapted to frequency converter, so as to
It is tested in the output signal to frequency converter.
In practical applications, circuit can be obtained by preset output signal, obtains the output signal of frequency converter.Its
In, which obtains the particular circuit configurations of circuit with no restriction.
Table 1
| Frequency input signal (HZ) | Duration of a scintillation (s) |
| < 30 | It does not work |
| 30-50 | 2.30 |
| 50-60 | 1.80 |
| 60-70 | 1.50 |
| 70-80 | 1.00 |
| 80-90 | 0.80 |
| 90-100 | 0.70 |
| 100-110 | 0.50 |
| 110-130 | 0.43 |
| 130-150 | 0.34 |
| 150-180 | 0.26 |
In the preferred embodiment of the present invention, referring to Fig. 2, which obtains circuit 2 and may include:
Current detection circuit 21 couples with the output end of frequency converter 1, is adapted to detect for the current signal of the output of frequency converter 1, will
The current signal detected is converted to ac voltage signal and exports to motor device 3；
Rectification circuit 22 is coupled with current detection circuit 21, suitable for the alternating voltage letter for exporting current detection circuit 21
Number be converted to d. c. voltage signal；
Filter circuit 23 is coupled with the output end of rectification circuit 22, was carried out suitable for the output signal to rectification circuit 22
Filter；
And switching circuit 24, the output end coupling of control terminal and filter circuit 23 are suitable for exporting in filter circuit 23 and believe
Number control under be connected or by.
In specific implementation, current detection circuit 21 can be realized using mutual inductor.The input terminal of the mutual inductor and frequency conversion
Device 1 couples, and output end and motor device 3 couple.
In specific implementation, rectification circuit 22 can be realized using rectifier bridge.Input terminal and the current detecting electricity of rectifier bridge
Road 21 couples, and output end and filter circuit 23 couple.
In specific implementation, filter circuit 23 can be realized using capacitor C and the resistance R0 in parallel with capacitor C.Filtering
The input terminal and rectification circuit 22 of circuit 23 couple, and output end and switching circuit 24 couple.
In specific implementation, switching circuit 24 can be realized using a variety of circuit structures.For example, switching circuit 24 can be adopted
It is realized with triode Q1.
Specifically, the output end of the base stage of triode Q1 and filter circuit 23 can be coupled, the collector of triode Q1
It as the output end of switching circuit 24, is coupled by first resistor R1 and DC power output end VCC, and passes through second resistance R2
Ground connection.
The current signal that frequency converter 1 exports, after overcurrent sensing circuit 21 is converted to ac voltage signal, then it is rectified
Circuit 22 is converted into d. c. voltage signal, and the control terminal of switching circuit 24 is input to after the filtering of filter circuit 23.
Step 13, whether the output signal for detecting frequency converter meets the second preset condition, and according to judging result output the
Two test results.
Referring to Fig. 2, when the conducting of switching circuit 24 is triode Q1 conducting, the output end of switching circuit 24 exports low level
Signal can be determined that the output signal of frequency converter 1 meets the second preset condition at this time, i.e. frequency converter 1 exports normally, and event does not occur
Barrier.It if the motor device 3 being adapted at this time with frequency converter 1 does not work yet, can be determined that the motor device 3 breaks down, repair
Personnel replace motor device 3.
When the cut-off of switching circuit 24 is triode Q1 cut-off, the output end of switching circuit 24 exports high level signal, this
When can be determined that the output signal of frequency converter 1 is unsatisfactory for the second preset condition, i.e. 1 output abnormality of frequency converter, frequency converter 1 occur therefore
Barrier.At this point, replacement frequency converter.
In specific implementation, the second test result can be exported using various ways.For example, can be by the way of voice
The second test result is exported, the second test result can also be exported by the way of display interface, can also be shown using LED light
Mode export the second test result.
Specifically, when exporting the second test result in such a way that LED light is shown, can be set corresponding LED light according to
Preset frequency scintillation.Wherein it is possible to which the flicker frequency that LED light is arranged is opposite in proportion with the frequency of frequency converter output signal
It answers.For example, being referred to the corresponding ratio that table 1 is configured between the flicker frequency of LED light and the frequency of frequency converter output signal
Example.
Fig. 3 is another frequency converter test method provided in an embodiment of the present invention, and this method may include steps of:
Step 31, whether the ac power input end for detecting frequency converter inputs preset AC supply voltage.
In practical applications, the ac power input end of frequency converter should usually input the AC supply voltage of 220V.Right
Before the input signal of frequency converter is tested, can first to frequency converter ac power input end input AC supply voltage
It is tested.It, can when the AC supply voltage that the ac power input end of frequency converter inputs is preset AC supply voltage
To exclude the failure of the voltage source for inverter supply, so can more accurately detect frequency converter whether failure.
When the ac power input end of frequency converter inputs preset AC supply voltage, can export as inverter supply
The normal third test result of voltage source, and execute step 32, otherwise can export for the voltage source of inverter supply it is abnormal
Third test result, and terminate the test process of entire frequency converter.
In practical applications, third test result can be exported using various ways, for example, can show using LED light
Mode export third test result.Specifically, can third test result be inverter supply voltage source it is normal when, if
It sets corresponding LED light to be always on, otherwise corresponding LED light is set extinguish.
Step 32, the input signal to be input to frequency converter is obtained, judges whether the input signal meets the first default item
Part.
About step 32, specifically it is referred to the above-mentioned description as described in step 11 and is implemented, details are not described herein again.
When input signal meets the first preset condition, frequency converter can be exported and input normal first test result, and
Step 33 is executed, otherwise can export the first abnormal test result of frequency converter input, and terminate the test of entire frequency converter
Journey.
Step 33, which is input to frequency converter, obtains the output signal of frequency converter, which is inputted
To the motor device being adapted to frequency converter.
Input signal is input to frequency converter, under normal circumstances, frequency converter can export corresponding output signal.Through frequency conversion
The output signal of device is exported to motor device, can be in order to judging the specific location to break down.
Step 34, whether the output signal for detecting frequency converter meets the second preset condition.
About step 34, specifically it is referred to the above-mentioned description as described in step 13 and is implemented, details are not described herein again.
In practical applications, when the output signal of frequency converter meets the second preset condition, step 35 is executed, it otherwise can be with
Execute step 36.
Step 35, the second test result that output frequency converter does not break down.
When frequency converter does not break down, if motor device does not work normally, maintenance personal can be determined that non-motor is set
For the failure of itself, motor device is replaced.
Step 36, the second test result of frequency converter failure is exported.
When frequency converter breaks down, maintenance personal replaces frequency converter.
It is understood that above-mentioned motor device includes but is not limited to that compressor etc. needs to become in the embodiment of invention
Frequency device no longer illustrates one by one herein come the equipment for driving it to operate.
In order to more fully understand those skilled in the art and realize the present invention, below to the corresponding device of the above method into
Row detailed description.
Referring to Fig. 4, the embodiment of the invention provides a kind of test devices 40 of frequency converter, which may include: defeated
Enter signal acquisition circuit 41, output signal obtains circuit 2, and obtains circuit 41 and output signal acquisition circuit with input signal
The control circuit 42 of 2 couplings, the first output circuit 43 and the second output circuit 44 coupled with control circuit 42.Wherein:
Input signal obtains circuit 41, suitable for obtaining the input signal to be input to frequency converter 1；
Output signal obtains circuit 2, suitable for obtaining the output signal of frequency converter 1；
Control circuit 42 is tested suitable for obtaining the input signal that circuit 41 obtains to input signal, and is believed in input
When number meeting the first preset condition, input signal is exported to frequency converter 1, the first test result is generated；And by output signal
It obtains the output signal that circuit 2 obtains and is input to the motor device 3 being adapted to frequency converter 1, and detect whether output signal meets
Second preset condition generates the second test result；
First output circuit 43 is suitable for the first test result of output；
Second output circuit 44 is suitable for the second test result of output.
Referring to Fig. 4, in one embodiment of this invention, it can be photo-coupler U1 that input signal, which obtains circuit 41,.Optocoupler
Input signal acquired in clutch U1 is input to control circuit 42.
In one embodiment of this invention, it is predeterminated frequency that the first preset condition, which may include: the frequency of input signal,.Control
Circuit 42 processed can determine that the input of frequency converter 1 is normal, otherwise determine frequency converter when input signal meets the first preset condition
1 input is abnormal.In the case where frequency converter 1 inputs normal situation, control circuit 42 again exports the input signal to frequency converter 1,
And then circuit 2 is obtained to obtain the output signal of frequency converter 1 by output signal.
In one embodiment of this invention, referring to Fig. 2, output signal obtains circuit 2 and may include:
Current detection circuit 21 couples with the output end of frequency converter 1, is adapted to detect for the current signal of the output of frequency converter 1, will
The current signal detected is converted to ac voltage signal and exports to motor device 3；
Rectification circuit 22 is coupled with current detection circuit 21, suitable for the alternating voltage letter for exporting current detection circuit 21
Number be converted to d. c. voltage signal；
Filter circuit 23 is coupled with the output end of rectification circuit 22, was carried out suitable for the output signal to rectification circuit 22
Filter；
And switching circuit 24, the output end coupling of control terminal and filter circuit 23 are suitable for exporting in filter circuit 23 and believe
Number control under be connected or by.
In one embodiment of this invention, switching circuit 24 may include: triode Q1.The base stage and filtering of triode Q1
The output end of circuit 23 couples, output end of the collector of triode Q1 as switching circuit 24, by first resistor R1 and directly
Galvanic electricity source output terminal VCC coupling, and be grounded by second resistance R2.
In one embodiment of this invention, control circuit 42 can switching circuit 24 be connected be triode Q1 conducting when,
Determine that the output signal of frequency converter 1 meets the second preset condition, i.e. frequency converter 1 is exported normally, do not broken down.Control circuit 42
It can determine that the output signal of frequency converter 1 is unsatisfactory for the second preset condition when it is triode Q1 cut-off that switching circuit 24, which ends,
I.e. 1 output abnormality of frequency converter, frequency converter 1 break down.
In practical applications, the first output circuit 43 can export the first test result using various ways.For example, first
Output circuit 43 can export the first test result by the way of voice, and first can also be exported by the way of display interface
Test result can also export the first test result in such a way that LED light is shown.
When first output circuit 43 exports the first test result in such a way that LED light is shown, it is referred to table 1 and is set
Set the correspondence ratio between the flicker frequency of LED light and the frequency of input signal.Details are not described herein again.
About the second output circuit 44, specifically it is referred to how the first output circuit 43 exports retouching for the first test result
It states, exports the second test result, details are not described herein again.
In one embodiment of this invention, control circuit 42 can also be detected and become before testing output signal
Whether the ac power input end of frequency device 1 inputs preset AC supply voltage, and generates third test result.
Specifically, it when the ac power input end of frequency converter 1 inputs preset AC supply voltage, can produce to become
The normal third test result of alternating-current voltage source that frequency device 1 is powered, the alternating-current voltage source for being otherwise produced as the power supply of frequency converter 1 are abnormal
Third test result.
Correspondingly, above-mentioned frequency converter test device 40 can also include: third output circuit 45, be suitable for output third test
As a result.
About third output circuit 45, it is referred to the description how the first output circuit 43 exports the first test result,
Third test result is exported, details are not described herein again.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (21)
1. a kind of frequency converter test method characterized by comprising
The input signal to be input to frequency converter is obtained, and the input signal is tested；
When the input signal meets the first preset condition, the first test result is exported, and the input signal is input to
The frequency converter obtains the output signal of the frequency converter, and the output signal is input to the electricity being adapted to the frequency converter
Machine equipment；
Whether the output signal for detecting the frequency converter meets the second preset condition, and is tied according to the second test of judging result output
Fruit.
2. frequency converter test method as described in claim 1, which is characterized in that the output letter for obtaining the frequency converter
Number, comprising:
Circuit is obtained by preset output signal, obtains the output signal of the frequency converter.
3. frequency converter test method as claimed in claim 2, which is characterized in that the output signal obtains circuit and includes:
Current detection circuit is coupled with the output end of the frequency converter, is adapted to detect for the current signal of the frequency converter output, will
The current signal detected is converted to ac voltage signal and is input to the motor device；
Rectification circuit is coupled with the current detection circuit, suitable for the ac voltage signal for exporting the current detection circuit
Be converted to d. c. voltage signal；
Filter circuit is coupled with the output end of the rectification circuit, is filtered suitable for the output signal to the rectification circuit；
And switching circuit, the output end coupling of control terminal and the filter circuit are suitable in the filter circuit output signal
Control under be connected or by.
4. frequency converter test method as claimed in claim 3, which is characterized in that the switching circuit includes: triode, described
The output end of the base stage of triode and the filter circuit couples, and the collector of the triode is as the defeated of the switching circuit
Outlet is coupled by first resistor and DC power output end, and is grounded by second resistance.
5. frequency converter test method as described in claim 3 or 4, which is characterized in that the output of the detection frequency converter
Whether signal meets the second preset condition, comprising:
When switching circuit conducting, determines that the output signal of the frequency converter meets second preset condition, otherwise sentence
The output signal of the fixed frequency converter is unsatisfactory for second preset condition.
6. frequency converter test method as described in claim 1, which is characterized in that first preset condition includes:
The frequency of the input signal is predeterminated frequency.
7. frequency converter test method as claimed in claim 6, which is characterized in that the input obtained to be input to frequency converter
Signal, comprising:
The input signal is obtained by photoelectrical coupler.
8. frequency converter test method as described in claim 1, which is characterized in that exported in such a way that LED light is shown described
First test result and/or second test result.
9. frequency converter test method as claimed in claim 8, which is characterized in that the flicker frequency of the LED light with detected
Signal frequency it is corresponding in proportion.
10. frequency converter test method as described in claim 1, which is characterized in that carrying out testing it to the input signal
Before, further includes:
Whether the ac power input end for detecting the frequency converter inputs preset AC supply voltage, and exports third test knot
Fruit.
11. frequency converter test method as claimed in claim 10, which is characterized in that export institute in such a way that LED light is shown
State third test result.
12. a kind of frequency converter test device characterized by comprising input signal obtains circuit, and output signal obtains circuit,
And the control circuit of circuit and output signal acquisition circuit coupling is obtained with the input signal, it is coupled with the control circuit
The first output circuit and the second output circuit；Wherein:
The input signal obtains circuit, suitable for obtaining the input signal to be input to frequency converter；
The output signal obtains circuit, suitable for obtaining the output signal of the frequency converter；
The control circuit is tested suitable for obtaining the input signal that circuit obtains to the input signal, and described defeated
When entering signal the first preset condition of satisfaction, the input signal is input to the frequency converter, generates the first test result；And
The output signal is obtained into the output signal that circuit obtains and is input to the motor device being adapted to the frequency converter, and detects institute
It states whether output signal meets the second preset condition, generates the second test result；
First output circuit is suitable for exporting first test result；
Second output circuit is suitable for exporting second test result.
13. frequency converter test device as claimed in claim 12, which is characterized in that the output signal obtains circuit and includes:
Current detection circuit is coupled with the output end of the frequency converter, is adapted to detect for the current signal of the frequency converter output, will
The current signal detected is converted to ac voltage signal and is input to the motor device；
Rectification circuit is coupled with the current detection circuit, suitable for the ac voltage signal for exporting the current detection circuit
Be converted to d. c. voltage signal；
Filter circuit is coupled with the output end of the rectification circuit, is filtered suitable for the output signal to the rectification circuit；
And switching circuit, the output end coupling of control terminal and the filter circuit are suitable in the filter circuit output signal
Control under on or off.
14. frequency converter test device as claimed in claim 13, which is characterized in that the switching circuit includes: triode, institute
The output end of the base stage and the filter circuit of stating triode couples, and the collector of the triode is as the switching circuit
Output end is coupled by first resistor and DC power output end, and is grounded by second resistance.
15. frequency converter test device according to claim 13 or 14, which is characterized in that the control circuit is suitable for working as institute
When stating switching circuit conducting, determines that the output signal of the frequency converter meets second preset condition, otherwise determine the change
The output signal of frequency device is unsatisfactory for second preset condition.
16. frequency converter test device as claimed in claim 12, which is characterized in that first preset condition includes:
The frequency of the input signal is predeterminated frequency.
17. frequency converter test device as claimed in claim 12, which is characterized in that it is optocoupler that the input signal, which obtains circuit,
Clutch.
18. frequency converter test device as claimed in claim 12, which is characterized in that first output circuit and/or described
Second output circuit outputs test result in such a way that LED light is shown.
19. frequency converter test device as claimed in claim 18, which is characterized in that the flicker frequency of the LED light with examined
The frequency of the signal of survey is corresponding in proportion.
20. frequency converter test device as claimed in claim 12, which is characterized in that the control circuit is further adapted for institute
It states before output signal tested, whether the ac power input end for detecting the frequency converter inputs preset AC power source electricity
Pressure, and generate third test result；
The frequency converter test device further include: third output circuit is suitable for output third test result.
21. frequency converter test device as claimed in claim 20, which is characterized in that the third output circuit is suitable for using
The mode that LED light is shown exports the third test result.
Priority Applications (1)
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| CN112130017A (en) * | 2020-09-10 | 2020-12-25 | 厦门华联电子股份有限公司 | Testing device for variable frequency driver |
| CN113900010A (en) * | 2021-09-30 | 2022-01-07 | 黄石东贝压缩机有限公司 | Portable frequency conversion control system rapid overhauling device and overhauling method |
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| CN109541334B (en) | 2022-02-11 |
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