CN215378733U - Frequency converter - Google Patents
Frequency converter Download PDFInfo
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- CN215378733U CN215378733U CN202120310745.3U CN202120310745U CN215378733U CN 215378733 U CN215378733 U CN 215378733U CN 202120310745 U CN202120310745 U CN 202120310745U CN 215378733 U CN215378733 U CN 215378733U
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- frequency converter
- main control
- control board
- circuit
- input contactor
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Abstract
An embodiment of the present invention provides a frequency converter, including: the input contactor, the electric leakage detection circuit, the filter circuit and the main control board that connect gradually, the input contactor is connected with three-phase input power, the main control board is connected with the input contactor. By the embodiment of the utility model, the leakage detection is not interfered, the misoperation is avoided, and the accuracy of the leakage detection is improved.
Description
Technical Field
The utility model relates to the technical field of electrical equipment, in particular to a frequency converter.
Background
In the field of elevator and escalator control, a control cabinet needs to be forcibly provided with an electric leakage protection device, and the electric leakage protection device becomes an essential component in a control system at one time.
The existing leakage protection devices are all installed in a control cabinet as an independent component and used for monitoring a power supply in real time. However, because the control cabinet also includes other electrical equipment including a frequency converter and the like, when the frequency converter operates, an interference current brought by a carrier wave of the frequency converter is connected to an input power supply in series, so that the current fluctuation of the power supply is caused, the leakage protection device frequently generates misoperation, and a higher false alarm rate is generated.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a frequency converter to solve the problem that a leakage protection device frequently generates misoperation to generate higher false alarm rate.
In order to solve the above technical problem, the embodiment of the present invention is implemented as follows:
in a first aspect, an embodiment of the present invention provides a frequency converter, including: the input contactor, the electric leakage detection circuit, the filter circuit and the main control board that connect gradually, the input contactor is connected with three-phase input power, the main control board is connected with the input contactor.
Further, the frequency converter further includes: the first level conversion circuit is arranged between the filter circuit and the main control board, and the second level conversion circuit is arranged between the main control board and the input contactor.
Further, the input contactor is arranged at the front end of the frequency converter.
Furthermore, the leakage detection circuit, the filter circuit, the main control board, the first level conversion circuit and the second level conversion circuit are integrated inside the frequency converter.
Further, the main control board sends a power-off signal to the input contactor when detecting a leakage state.
Further, the main control board is also used for recording the electric leakage state when the electric leakage state is detected.
Further, the leakage detection circuit includes a hall sensor and a current detection circuit.
Further, the main control board comprises a low-pass filtering unit.
According to the technical scheme provided by the embodiment of the utility model, the input contactor, the leakage detection circuit, the filter circuit and the main control board are sequentially connected, the input contactor is connected with the three-phase input power supply, the main control board is connected with the input contactor, and the interference frequency of the frequency converter during operation is eliminated through the double filtering action of the filter circuit and the main control board, so that the leakage detection is not interfered, the misoperation is avoided, and the accuracy of the leakage detection is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a leakage detection circuit according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of the frequency converter according to the embodiment of the present invention.
Detailed Description
The embodiment of the utility model provides a frequency converter.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a frequency converter, where the frequency converter 100 may include: the input contactor 101, electric leakage detection circuit 102, filter circuit 103 and the main control board 104 that connect gradually, input contactor 101 is connected with three-phase input power, main control board 104 is connected with input contactor 101.
The input contactor 101 mainly functions to cut off the power supply of the frequency converter, and when the frequency converter leaks electricity, the three-phase input power supply can be cut off completely, so that the functions of protecting personal safety and preventing fire are achieved.
The leakage detecting circuit 102 is configured to detect an electrical signal of a three-phase input power source.
Further, as shown in fig. 2, the leakage detecting circuit includes a hall sensor W1 and a current detecting circuit. In normal operation, the sum of the currents of the inputs L1, L2, L3, N, PE is zero, but if leakage occurs, the sum of the currents is not zero.
The filter circuit 103 and the main control board 104 both have a filtering function. The filtering circuit 103 is a hardware filtering circuit, for example, an RC circuit or an LC circuit may be used for filtering, and the main control board 104 may be a software filtering circuit. When leakage occurs, the leakage current frequency is 50/60Hz, which is the effective leakage current. However, the interference generated when the frequency converter operates is generally 2 kHz-20 kHz. Through double filtering of hardware and software, interference frequency of the frequency converter is suppressed, and therefore the false alarm rate is reduced.
Further, the main control board 104 includes a low-pass filtering unit, and the filtering may be performed by a low-pass filtering algorithm.
Further, the main control board 104 sends a power-off signal to the input contactor 101 when detecting the leakage state. The input contactor 101 will cut off the three-phase input power after receiving the power-off signal.
According to the technical scheme provided by the embodiment of the utility model, the input contactor, the leakage detection circuit, the filter circuit and the main control board are sequentially connected, the input contactor is connected with the three-phase input power supply, the main control board is connected with the input contactor, and the interference frequency of the frequency converter during operation is eliminated through the double filtering action of the filter circuit and the main control board, so that the leakage detection is not interfered, the misoperation is avoided, and the accuracy of the leakage detection is improved.
Based on the above embodiment, further, as shown in fig. 3, the frequency converter 100 further includes: a first level shift circuit 105 disposed between the filter circuit 103 and the main control board 104, and a second level shift circuit 106 disposed between the main control board 104 and the input contactor 101.
The first level shift circuit 105 is used to change the level voltage and level logic of the output signal of the filter circuit 103, so that it is suitable for the main control board 104. The second level shift circuit 106 is used to change the level voltage and level logic of the output signal of the main control board 104, so that the output signal is suitable for the input contactor 101.
Further, the input contactor 101 is disposed at the front end of the frequency converter 100.
Further, the leakage detection circuit 102, the filter circuit 103, the main control board 104, the first level shift circuit 105, and the second level shift circuit 106 are all integrated inside the frequency converter 100.
According to the technical scheme provided by the embodiment of the utility model, the first level conversion circuit and the second level conversion circuit are added, and the electric leakage detection circuit, the filter circuit, the main control board, the first level conversion circuit and the second level conversion circuit are integrated in the frequency converter, so that the internal circuit of the frequency converter is reasonably utilized, an independent electric leakage protection device is not required to be additionally added, the size is reduced, and the cost is reduced.
Based on the above embodiment, further, the main control board is further configured to record the leakage state when detecting the leakage state.
When the main control board detects the leakage state, besides sending a power-off signal to the input contactor, it also needs to record each leakage fault. And a complex networking module can be further used for directly sending the record of the leakage fault to the platform so as to enable maintenance personnel to quickly respond.
According to the technical scheme provided by the embodiment of the utility model, the leakage fault can be traced and quickly responded by recording the leakage state.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. A frequency converter, characterized in that the frequency converter comprises: the input contactor, the electric leakage detection circuit, the filter circuit and the main control board that connect gradually, the input contactor is connected with three-phase input power, the main control board is connected with the input contactor, the main control board includes low pass filter unit.
2. The frequency converter of claim 1, further comprising: the first level conversion circuit is arranged between the filter circuit and the main control board, and the second level conversion circuit is arranged between the main control board and the input contactor.
3. The frequency converter according to claim 1, wherein the input contactor is disposed at a front end of the frequency converter.
4. The frequency converter according to claim 2, wherein the leakage detection circuit, the filter circuit, the main control board, the first level shift circuit and the second level shift circuit are integrated inside the frequency converter.
5. The frequency converter according to claim 1, wherein the main control board sends a power-off signal to the input contactor if a leakage state is detected.
6. The frequency converter according to claim 5, wherein the main control board is further configured to record the leakage state when the leakage state is detected.
7. The frequency converter of claim 1, wherein the leakage detection circuit comprises a hall sensor and a current detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120310745.3U CN215378733U (en) | 2021-02-03 | 2021-02-03 | Frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120310745.3U CN215378733U (en) | 2021-02-03 | 2021-02-03 | Frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215378733U true CN215378733U (en) | 2021-12-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120310745.3U Active CN215378733U (en) | 2021-02-03 | 2021-02-03 | Frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215378733U (en) |
-
2021
- 2021-02-03 CN CN202120310745.3U patent/CN215378733U/en active Active
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