CN109541334B - Frequency converter testing method and testing device - Google Patents
Frequency converter testing method and testing device Download PDFInfo
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- CN109541334B CN109541334B CN201710872816.7A CN201710872816A CN109541334B CN 109541334 B CN109541334 B CN 109541334B CN 201710872816 A CN201710872816 A CN 201710872816A CN 109541334 B CN109541334 B CN 109541334B
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Abstract
A frequency converter testing method and a testing device are provided. The method comprises the following steps: acquiring an input signal to be input to a frequency converter, and testing the input signal; when the input signal meets a first preset condition, outputting a first test result, outputting the input signal to the frequency converter, acquiring an output signal of the frequency converter, and inputting the output signal to motor equipment adaptive to the frequency converter; and detecting whether the output signal of the frequency converter meets a second preset condition or not, and outputting a second test result according to a judgment result. By applying the scheme, whether the frequency converter breaks down or not can be more accurately judged, and then equipment which breaks down can be more accurately replaced, so that the service cost is reduced.
Description
Technical Field
The invention relates to the field of frequency converter testing, in particular to a frequency converter testing method and a frequency converter testing device.
Background
The frequency converter is an electric control device which applies frequency conversion technology and microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor, and is widely applied to motor devices such as compressors and the like.
In practical applications, it is often necessary to test the frequency converter to determine whether its state is normal. But the accuracy of the current testing method is poor.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to improve the accuracy of the frequency converter test.
To this end, an aspect of the present invention provides a method for testing a frequency converter, the method including: acquiring an input signal to be input to a frequency converter, and testing the input signal; when the input signal meets a first preset condition, outputting a first test result, outputting the input signal to the frequency converter, acquiring an output signal of the frequency converter, and inputting the output signal to motor equipment adaptive to the frequency converter; and detecting whether the output signal of the frequency converter meets a second preset condition or not, and outputting a second test result according to a judgment result.
When the input signal meets the first preset condition, the output signal of the frequency converter is tested, and whether the frequency converter breaks down or not can be accurately determined compared with the method for testing only the input signal of the frequency converter, so that the equipment which breaks down can be accurately replaced, and the service cost is reduced.
Optionally, the acquiring the output signal of the frequency converter includes: and acquiring the output signal of the frequency converter through a preset output signal acquisition circuit.
Optionally, the output signal acquiring circuit includes: the current detection circuit is coupled with the output end of the frequency converter, is suitable for detecting a current signal output by the frequency converter and converting the detected current signal into an alternating voltage signal; the rectifying circuit is coupled with the current detection circuit and is suitable for converting the alternating current voltage signal output by the current detection circuit into a direct current voltage signal; the filter circuit is coupled with the output end of the rectifying circuit and is suitable for filtering the output signal of the rectifying circuit; and the control end of the switch circuit is coupled with the output end of the filter circuit and is suitable for being switched on or switched off under the control of the output signal of the filter circuit. The switch circuit can output signals with different voltages in the on state and the off state, so that whether the output signal of the frequency converter meets a second preset condition or not can be judged.
Optionally, the switching circuit comprises: and the base electrode of the triode is coupled with the output end of the filter circuit, and the collector electrode of the triode is used as the output end of the switch circuit, is coupled with the output end of the direct-current power supply through a first resistor and is grounded through a second resistor. The triode is used as the switching circuit, so that the structure of the switching circuit can be simplified, and the circuit is convenient to realize.
Optionally, the detecting whether the output signal of the frequency converter meets a second preset condition includes: and when the switching circuit is conducted, judging that the output signal of the frequency converter meets the second preset condition, otherwise, judging that the output signal of the frequency converter does not meet the second preset condition.
Optionally, the first preset condition includes: the frequency of the input signal is a preset frequency. The frequency of the input signal is the preset frequency, the input signal is output to the frequency converter, the output of the frequency converter can be detected under the condition that the input of the frequency converter is normal, and whether the frequency converter is in fault or not is determined based on the output of the frequency converter.
Optionally, the acquiring an input signal to be input to the frequency converter includes: the input signal is acquired through a photocoupler. The photoelectric coupler is adopted to obtain the input signal, so that the attenuation of the input signal can be reduced, and the detection accuracy is improved.
Optionally, the first test result and/or the second test result is output in a manner of LED light display. Thereby, the user can obtain the test result more intuitively.
Optionally, the frequency of flashing of the LED light corresponds proportionally to the frequency of the detected signal. Therefore, a user can conveniently determine whether the input signal and the output signal of the frequency converter are normal according to the flicker frequency of the LED lamp, and can also determine whether the frequency converter has a fault.
Optionally, before the testing the input signal, the method further includes: and detecting whether the input end of the alternating current power supply of the frequency converter inputs a preset alternating current power supply voltage or not, and outputting a third test result. On the premise that the preset alternating current power supply voltage is input at the alternating current power supply input end of the frequency converter, the input signal and the output signal of the frequency converter are tested, whether the frequency converter breaks down or not can be determined more accurately, and the testing accuracy is improved.
Optionally, the third test result is output in a manner of LED light display. Thereby, the test result can be obtained more intuitively.
The embodiment of the invention also provides a frequency converter testing device, which comprises: the circuit comprises an input signal acquisition circuit, an output signal acquisition circuit, a control circuit coupled with the input signal acquisition circuit and the output signal acquisition circuit, and a first output circuit and a second output circuit coupled with the control circuit; wherein: the input signal acquisition circuit is suitable for acquiring an input signal to be input to the frequency converter; the output signal acquisition circuit is suitable for acquiring the output signal of the frequency converter; the control circuit is suitable for testing the input signal acquired by the input signal acquisition circuit, and outputting the input signal to the frequency converter to generate a first test result when the input signal meets a first preset condition; inputting the output signal acquired by the output signal acquisition circuit to motor equipment adaptive to the frequency converter, detecting whether the output signal meets a second preset condition, and generating a second test result; the first output circuit is suitable for outputting the first test result; the second output circuit is suitable for outputting the second test result.
Optionally, the output signal acquiring circuit includes: the current detection circuit is coupled with the output end of the frequency converter, is suitable for detecting a current signal output by the frequency converter and converting the detected current signal into an alternating voltage signal; the rectifying circuit is coupled with the current detection circuit and is suitable for converting the alternating current voltage signal output by the current detection circuit into a direct current voltage signal; the filter circuit is coupled with the output end of the rectifying circuit and is suitable for filtering the output signal of the rectifying circuit; and the control end of the switch circuit is coupled with the output end of the filter circuit and is suitable for being switched on or switched off under the control of the output signal of the filter circuit.
Optionally, the switching circuit comprises: and the base electrode of the triode is coupled with the output end of the filter circuit, and the collector electrode of the triode is used as the output end of the switch circuit, is coupled with the output end of the direct-current power supply through a first resistor and is grounded through a second resistor.
Optionally, the control circuit is adapted to determine that the output signal of the frequency converter satisfies the second preset condition when the switch circuit is turned on, and otherwise determine that the output signal of the frequency converter does not satisfy the second preset condition.
Optionally, the first preset condition includes: the frequency of the input signal is a preset frequency.
Optionally, the input signal acquisition circuit is an optocoupler.
Optionally, the first output circuit and/or the second output circuit outputs the test result in a manner of LED light display.
Optionally, the frequency of flashing of the LED light corresponds proportionally to the frequency of the detected signal.
Optionally, the control circuit is further adapted to detect whether a preset ac power voltage is input to an ac power input terminal of the frequency converter before the output signal is tested, and generate a third test result; the frequency converter testing device further comprises: and the third output circuit is suitable for outputting a third test result.
Optionally, the third output circuit is adapted to output the third test result in a manner of LED light display.
Drawings
FIG. 1 is a flow chart of a method for testing a frequency converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure of an output signal obtaining circuit according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for testing a frequency converter according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a frequency converter testing apparatus according to an embodiment of the present invention.
Detailed Description
Currently, when testing a frequency converter, only an input signal of the frequency converter to be tested is generally tested. When the input signal of the frequency converter is normal, and the frequency converter and the motor equipment connected with the frequency converter still cannot normally work, the frequency converter and the motor equipment are generally required to be replaced due to the fact that the frequency converter or the motor equipment cannot be further determined, and therefore the service cost is high.
In view of the above problems, embodiments of the present invention provide a method for testing a frequency converter, where an output signal of the frequency converter is tested when an input signal meets a first preset condition, and whether the frequency converter fails can be more accurately determined as compared with a method for testing only an input signal of the frequency converter, so that a failed device can be more accurately replaced, and service cost is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a method for testing a frequency converter, where the method may include:
and step 11, acquiring an input signal to be input to the frequency converter, and testing the input signal.
In specific implementation, the input signal to be input to the frequency converter may be obtained in various ways, and is not limited in particular. For example, the input signal of the frequency converter can be obtained through a photoelectric coupler so as to reduce the signal attenuation to the maximum extent.
In practical application, an input signal of the frequency converter is tested, namely whether the input signal of the frequency converter meets a first preset condition is tested. When the input signal of the frequency converter meets a first preset condition, the input of a frequency converter parent can be judged to be normal, otherwise, the input of the frequency converter is judged to be abnormal.
In an embodiment of the present invention, the first preset condition may include: the frequency of the input signal is a preset frequency. Taking the input signal of the frequency converter as a square wave signal as an example, the input signal of the frequency converter is tested, that is, whether the frequency of the square wave is a preset frequency is tested. The preset frequency can be set according to the practical application condition of the frequency converter.
And 12, outputting a first test result when the input signal meets a first preset condition, inputting the input signal to the frequency converter, acquiring an output signal of the frequency converter, and inputting the output signal to the motor equipment matched with the frequency converter.
When the input signal meets the first preset condition, the input of the frequency converter is normal. At this time, the first test result may be output in various ways. For example, the first test result may be output in a voice manner, or may be output in a display interface manner.
In an embodiment of the present invention, in order to obtain the first test result more intuitively, the first test result may be output in a manner of LED light display. When the input of the frequency converter is normal, the corresponding LED lamp can be set to flicker according to the preset frequency.
Wherein, the flicker frequency of the LED lamp is in proportion to the frequency of the input signal. For example, setting the correspondence ratio between the blinking frequency of the LED lamp and the frequency of the input signal may be performed with reference to table 1.
In the case where the input of the frequency converter is normal, the input signal is input to the frequency converter. At this time, the frequency converter has a corresponding output. And acquiring an output signal of the frequency converter and outputting the output signal to the motor equipment adaptive to the frequency converter so as to test the output signal of the frequency converter.
In practical application, the output signal of the frequency converter can be obtained through a preset output signal obtaining circuit. The specific circuit structure of the output signal acquiring circuit is not limited.
TABLE 1
| Input signal frequency (HZ) | Duration of scintillation(s) |
| ＜30 | Not working |
| 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 a preferred embodiment of the present invention, referring to fig. 2, the output signal acquiring circuit 2 may include:
a current detection circuit 21 coupled to an output terminal of the frequency converter 1, adapted to detect a current signal output by the frequency converter 1, convert the detected current signal into an ac voltage signal, and output the ac voltage signal to the motor device 3;
a rectifying circuit 22, coupled to the current detection circuit 21, and adapted to convert an ac voltage signal output by the current detection circuit 21 into a dc voltage signal;
a filter circuit 23, coupled to an output terminal of the rectifying circuit 22, and adapted to filter an output signal of the rectifying circuit 22;
and a switch circuit 24, a control terminal of which is coupled to the output terminal of the filter circuit 23 and is adapted to be turned on or off under the control of the output signal of the filter circuit 23.
In a specific implementation, the current detection circuit 21 may be implemented by a transformer. The input of the transformer is coupled to the frequency converter 1, and the output is coupled to the electrical machine 3.
In a specific implementation, the rectifying circuit 22 may be implemented using a rectifying bridge. The input of the rectifier bridge is coupled to the current detection circuit 21 and the output is coupled to the filter circuit 23.
In a specific implementation, the filter circuit 23 may be implemented by using a capacitor C and a resistor R0 connected in parallel with the capacitor C. The filter circuit 23 has an input coupled to the rectifying circuit 22 and an output coupled to the switching circuit 24.
In particular implementations, switching circuit 24 may be implemented using a variety of circuit configurations. For example, the switching circuit 24 may be implemented using a transistor Q1.
Specifically, the base of the transistor Q1 may be coupled to the output of the filter circuit 23, and the collector of the transistor Q1 may be used as the output of the switch circuit 24, coupled to the dc power output VCC through the first resistor R1, and grounded through the second resistor R2.
The current signal output by the frequency converter 1 is converted into an alternating current voltage signal by the current detection circuit 21, then converted into a direct current voltage signal by the rectification circuit 22, filtered by the filter circuit 23 and input to the control end of the switch circuit 24.
And step 13, detecting whether the output signal of the frequency converter meets a second preset condition, and outputting a second test result according to the judgment result.
Referring to fig. 2, when the switching circuit 24 is turned on, that is, the transistor Q1 is turned on, the output terminal of the switching circuit 24 outputs a low level signal, and at this time, it can be determined that the output signal of the frequency converter 1 satisfies the second preset condition, that is, the output of the frequency converter 1 is normal and has no fault. If the motor device 3 adapted to the frequency converter 1 does not work, it can be determined that the motor device 3 has a fault, and the maintenance personnel can replace the motor device 3.
When the switching circuit 24 is turned off, that is, the transistor Q1 is turned off, the output terminal of the switching circuit 24 outputs a high level signal, and at this time, it can be determined that the output signal of the frequency converter 1 does not satisfy the second preset condition, that is, the output of the frequency converter 1 is abnormal, and the frequency converter 1 fails. At this time, the frequency converter is replaced.
In particular implementations, the second test result may be output in a variety of ways. For example, the second test result may be output in a voice manner, the second test result may be output in a display interface manner, or the second test result may be output in an LED display manner.
Specifically, when the second test result is output in the LED lamp display mode, the corresponding LED lamp may be set to blink according to a preset frequency. Wherein, the flicker frequency of the LED lamp can be set to correspond to the frequency of the output signal of the frequency converter in proportion. For example, setting the correspondence ratio between the blinking frequency of the LED lamp and the frequency of the inverter output signal may be performed with reference to table 1.
Fig. 3 is another frequency converter testing method provided in the embodiment of the present invention, which may include the following steps:
and step 31, detecting whether the input end of the alternating current power supply of the frequency converter inputs a preset alternating current power supply voltage.
In practical applications, the ac power input terminal of the frequency converter should generally input 220V ac power voltage. Before testing the input signal of the frequency converter, the voltage of the alternating current power supply input by the alternating current power supply input end of the frequency converter can be tested. When the alternating current power supply voltage input at the alternating current power supply input end of the frequency converter is the preset alternating current power supply voltage, the fault of a voltage source for supplying power to the frequency converter can be eliminated, and then whether the frequency converter is in fault or not can be detected more accurately.
And when the preset alternating current power supply voltage is input to the alternating current power supply input end of the frequency converter, outputting a third test result that the voltage source supplying power to the frequency converter is normal, and executing the step 32, otherwise, outputting a third test result that the voltage source supplying power to the frequency converter is abnormal, and ending the test process of the whole frequency converter.
In practical applications, the third test result may be output in various manners, for example, the third test result may be output in a manner of being displayed by an LED lamp. Specifically, when the third test result is that the voltage source supplying power to the frequency converter is normal, the corresponding LED lamp may be set to be normally on, otherwise, the corresponding LED lamp may be set to be turned off.
And when the input signal meets the first preset condition, outputting a first test result that the frequency converter inputs normally, and executing the step 33, otherwise, outputting a first test result that the frequency converter inputs abnormally, and ending the test process of the whole frequency converter.
And step 33, inputting the input signal into the frequency converter, acquiring an output signal of the frequency converter, and inputting the output signal into the motor equipment matched with the frequency converter.
The input signal is input to the frequency converter, and under the normal condition, the frequency converter outputs a corresponding output signal. The output signal of the frequency converter is output to the motor equipment, so that the specific position of the fault can be conveniently judged.
And step 34, detecting whether the output signal of the frequency converter meets a second preset condition.
In practical applications, when the output signal of the frequency converter satisfies the second preset condition, step 35 is executed, otherwise step 36 may be executed.
And step 35, outputting a second test result that the frequency converter does not have a fault.
When the frequency converter is not in fault, if the motor equipment does not work normally, the maintenance personnel can judge that the motor equipment does not have the fault, and the motor equipment can be replaced.
And step 36, outputting a second test result of the frequency converter fault.
When the frequency converter breaks down, maintenance personnel can replace the frequency converter.
It is understood that, in the embodiment of the present invention, the motor device includes, but is not limited to, a compressor and other devices that require an inverter to operate, and therefore, the description is not repeated here.
In order that those skilled in the art will better understand and realize the present invention, the following detailed description is provided for the device corresponding to the above method.
Referring to fig. 4, an embodiment of the present invention provides a testing apparatus 40 for a frequency converter, where the apparatus 40 may include: the input signal acquiring circuit 41, the output signal acquiring circuit 2, the control circuit 42 coupled to the input signal acquiring circuit 41 and the output signal acquiring circuit 2, and the first output circuit 43 and the second output circuit 44 coupled to the control circuit 42. Wherein:
an input signal acquisition circuit 41 adapted to acquire an input signal to be input to the frequency converter 1;
an output signal acquisition circuit 2 adapted to acquire an output signal of the frequency converter 1;
the control circuit 42 is adapted to test the input signal acquired by the input signal acquisition circuit 41, and output the input signal to the frequency converter 1 when the input signal meets a first preset condition, so as to generate a first test result; inputting the output signal acquired by the output signal acquisition circuit 2 to the motor device 3 adapted to the frequency converter 1, detecting whether the output signal meets a second preset condition, and generating a second test result;
a first output circuit 43 adapted to output a first test result;
a second output circuit 44 adapted to output the second test result.
Referring to fig. 4, in an embodiment of the present invention, the input signal acquiring circuit 41 may be an optical coupler U1. The input signal acquired by the photo coupler U1 is input to the control circuit 42.
In an embodiment of the present invention, the first preset condition may include: the frequency of the input signal is a preset frequency. The control circuit 42 may determine that the input of the frequency converter 1 is normal when the input signal satisfies the first preset condition, and otherwise determine that the input of the frequency converter 1 is abnormal. When the input of the frequency converter 1 is normal, the control circuit 42 outputs the input signal to the frequency converter 1, and the output signal of the frequency converter 1 is obtained by the output signal obtaining circuit 2.
In an embodiment of the present invention, referring to fig. 2, the output signal acquiring circuit 2 may include:
a current detection circuit 21 coupled to an output terminal of the frequency converter 1, adapted to detect a current signal output by the frequency converter 1, convert the detected current signal into an ac voltage signal, and output the ac voltage signal to the motor device 3;
a rectifying circuit 22, coupled to the current detection circuit 21, and adapted to convert an ac voltage signal output by the current detection circuit 21 into a dc voltage signal;
a filter circuit 23, coupled to an output terminal of the rectifying circuit 22, and adapted to filter an output signal of the rectifying circuit 22;
and a switch circuit 24, a control terminal of which is coupled to the output terminal of the filter circuit 23 and is adapted to be turned on or off under the control of the output signal of the filter circuit 23.
In an embodiment of the present invention, the switch circuit 24 may include: a transistor Q1. The base of the transistor Q1 is coupled to the output terminal of the filter circuit 23, and the collector of the transistor Q1 is used as the output terminal of the switch circuit 24, and is coupled to the dc power output terminal VCC through the first resistor R1, and is grounded through the second resistor R2.
In an embodiment of the present invention, the control circuit 42 may determine that the output signal of the frequency converter 1 satisfies the second predetermined condition when the switching circuit 24 is turned on, i.e., the transistor Q1 is turned on, i.e., the output of the frequency converter 1 is normal and has no fault. When the switching circuit 24 is turned off, that is, the transistor Q1 is turned off, the control circuit 42 may determine that the output signal of the frequency converter 1 does not satisfy the second preset condition, that is, the output of the frequency converter 1 is abnormal, and the frequency converter 1 fails.
In practical applications, the first output circuit 43 may output the first test result in various ways. For example, the first output circuit 43 may output the first test result in a voice manner, may output the first test result in a display interface manner, and may output the first test result in an LED light display manner.
When the first output circuit 43 outputs the first test result in the LED lamp display manner, the corresponding ratio between the blinking frequency of the LED lamp and the frequency of the input signal may be set with reference to table 1. And will not be described in detail herein.
For the second output circuit 44, it may specifically refer to the description of how the first output circuit 43 outputs the first test result, and output the second test result, which is not described herein again.
In an embodiment of the present invention, the control circuit 42 may further detect whether a predetermined ac power voltage is input to the ac power input terminal of the frequency converter 1 before the output signal is tested, and generate a third test result.
Specifically, when a preset ac power voltage is input to the ac power input terminal of the frequency converter 1, a third test result that the ac voltage source supplying power to the frequency converter 1 is normal may be generated, otherwise, a third test result that the ac voltage source supplying power to the frequency converter 1 is abnormal may be generated.
Correspondingly, the frequency converter testing apparatus 40 may further include: and a third output circuit 45 adapted to output a third test result.
Regarding the third output circuit 45, the description of how the first output circuit 43 outputs the first test result can be referred to, and the third test result is output, which is not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (21)
1. A frequency converter testing method for testing a system including a frequency converter and an electric machine device for the presence of a fault, comprising:
acquiring an input signal to be input to a frequency converter, and testing the input signal;
when the input signal meets a first preset condition, outputting a first test result, inputting the input signal to the frequency converter, acquiring an output signal of the frequency converter, and inputting the output signal to motor equipment adaptive to the frequency converter;
detecting whether the output signal of the frequency converter meets a second preset condition or not, and outputting a second test result according to a judgment result; when the output signal meets a second preset condition, the motor equipment has a fault; and when the output signal does not meet the second preset condition, the frequency converter has a fault.
2. The method for testing a frequency converter according to claim 1, wherein said obtaining an output signal of said frequency converter comprises:
and acquiring the output signal of the frequency converter through a preset output signal acquisition circuit.
3. The frequency converter testing method of claim 2, wherein the output signal acquisition circuit comprises:
the current detection circuit is coupled with the output end of the frequency converter, is suitable for detecting a current signal output by the frequency converter, converts the detected current signal into an alternating voltage signal and inputs the alternating voltage signal to the motor equipment;
the rectifying circuit is coupled with the current detection circuit and is suitable for converting the alternating current voltage signal output by the current detection circuit into a direct current voltage signal;
the filter circuit is coupled with the output end of the rectifying circuit and is suitable for filtering the output signal of the rectifying circuit;
and the control end of the switch circuit is coupled with the output end of the filter circuit and is suitable for being switched on or switched off under the control of the output signal of the filter circuit.
4. The frequency converter testing method of claim 3, wherein the switching circuit comprises: and the base electrode of the triode is coupled with the output end of the filter circuit, and the collector electrode of the triode is used as the output end of the switch circuit, is coupled with the output end of the direct-current power supply through a first resistor and is grounded through a second resistor.
5. The method for testing a frequency converter according to claim 3 or 4, wherein the detecting whether the output signal of the frequency converter meets a second preset condition comprises:
and when the switching circuit is conducted, judging that the output signal of the frequency converter meets the second preset condition, otherwise, judging that the output signal of the frequency converter does not meet the second preset condition.
6. The frequency converter testing method of claim 1, wherein the first preset condition comprises:
the frequency of the input signal is a preset frequency.
7. The method for testing a frequency converter according to claim 6, wherein said obtaining an input signal to be input to the frequency converter comprises:
the input signal is acquired through a photocoupler.
8. The frequency converter testing method according to claim 1, wherein the first testing result and/or the second testing result is output in a manner of LED lamp display.
9. The frequency converter testing method of claim 8, wherein a flicker frequency of the LED lamp corresponds proportionally to a frequency of the detected signal.
10. The frequency converter testing method of claim 1, further comprising, prior to testing the input signal:
and detecting whether the input end of the alternating current power supply of the frequency converter inputs a preset alternating current power supply voltage or not, and outputting a third test result.
11. The frequency converter testing method of claim 10, wherein the third testing result is outputted in a manner of LED light display.
12. A frequency converter testing apparatus for testing a system including a frequency converter and an electric machine device for the presence of a fault, comprising: the circuit comprises an input signal acquisition circuit, an output signal acquisition circuit, a control circuit coupled with the input signal acquisition circuit and the output signal acquisition circuit, and a first output circuit and a second output circuit coupled with the control circuit; wherein:
the input signal acquisition circuit is suitable for acquiring an input signal to be input to the frequency converter;
the output signal acquisition circuit is suitable for acquiring the output signal of the frequency converter;
the control circuit is suitable for testing the input signal acquired by the input signal acquisition circuit, and inputting the input signal to the frequency converter to generate a first test result when the input signal meets a first preset condition; inputting the output signal acquired by the output signal acquisition circuit to motor equipment adaptive to the frequency converter, detecting whether the output signal meets a second preset condition, and generating a second test result; when the output signal meets a second preset condition, the motor equipment has a fault; when the output signal does not meet a second preset condition, the frequency converter has a fault;
the first output circuit is suitable for outputting the first test result;
the second output circuit is suitable for outputting the second test result.
13. The frequency converter testing apparatus of claim 12, wherein said output signal acquisition circuit comprises:
the current detection circuit is coupled with the output end of the frequency converter, is suitable for detecting a current signal output by the frequency converter, converts the detected current signal into an alternating voltage signal and inputs the alternating voltage signal to the motor equipment;
the rectifying circuit is coupled with the current detection circuit and is suitable for converting the alternating current voltage signal output by the current detection circuit into a direct current voltage signal;
the filter circuit is coupled with the output end of the rectifying circuit and is suitable for filtering the output signal of the rectifying circuit;
and the control end of the switch circuit is coupled with the output end of the filter circuit and is suitable for being switched on or switched off under the control of the output signal of the filter circuit.
14. The frequency converter testing apparatus of claim 13, wherein the switching circuit comprises: and the base electrode of the triode is coupled with the output end of the filter circuit, and the collector electrode of the triode is used as the output end of the switch circuit, is coupled with the output end of the direct-current power supply through a first resistor and is grounded through a second resistor.
15. The frequency converter testing apparatus according to claim 13 or 14, wherein the control circuit is adapted to determine that the output signal of the frequency converter satisfies the second preset condition when the switching circuit is turned on, and otherwise determine that the output signal of the frequency converter does not satisfy the second preset condition.
16. The frequency converter testing apparatus of claim 12, wherein the first preset condition comprises:
the frequency of the input signal is a preset frequency.
17. The frequency converter testing apparatus of claim 12, wherein the input signal acquisition circuit is an optocoupler.
18. The frequency converter testing device according to claim 12, wherein the first output circuit and/or the second output circuit outputs the test result in a manner of LED lamp display.
19. The frequency converter testing apparatus of claim 18, wherein a flicker frequency of the LED lamp corresponds proportionally to a frequency of the detected signal.
20. The frequency converter testing apparatus of claim 12, wherein the control circuit is further adapted to detect whether a predetermined ac power voltage is input to the ac power input terminal of the frequency converter before the output signal is tested, and to generate a third test result;
the frequency converter testing device further comprises: and the third output circuit is suitable for outputting a third test result.
21. The frequency converter testing apparatus of claim 20, wherein the third output circuit is adapted to output the third test result in a manner of LED light display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710872816.7A CN109541334B (en) | 2017-09-22 | 2017-09-22 | Frequency converter testing method and testing device |
Applications Claiming Priority (1)
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| CN112130017B (en) * | 2020-09-10 | 2024-05-10 | 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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| CN206074678U (en) * | 2016-10-14 | 2017-04-05 | 中铁建设集团设备安装有限公司 | A kind of line voltage exception indicating circuit |
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| CN109541334A (en) | 2019-03-29 |
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