CN203339935U - Low-voltage frequency converter having undervoltage protection function - Google Patents
Low-voltage frequency converter having undervoltage protection function Download PDFInfo
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- CN203339935U CN203339935U CN2012206358577U CN201220635857U CN203339935U CN 203339935 U CN203339935 U CN 203339935U CN 2012206358577 U CN2012206358577 U CN 2012206358577U CN 201220635857 U CN201220635857 U CN 201220635857U CN 203339935 U CN203339935 U CN 203339935U
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Abstract
The utility model discloses a low-voltage frequency converter having an undervoltage protection function, comprising a voltage signal acquisition module, an analogue/digital conversion module, a signal comparison module, and a main control module. The voltage signal acquisition module acquires and outputs the voltage signals of the low-voltage frequency converter; the analogue/digital conversion module receives the voltage signals and converts the voltage signals to digital signals for outputting; the signal comparison module receives the digital signals, and compares the digital signals with reference voltage signals and outputs undervoltage signals. The main control module receives the undervoltage signals and controls the power output of the low-voltage frequency converter. The voltage signal acquisition module, the analogue/digital conversion module, the signal comparison module and the main control module are successively and electrically connected. By configuring the voltage signal acquisition module which can automatically detect undervoltage faults of the frequency converter, the low-voltage frequency converter having an undervoltage protection function can stop the power output of the frequency module by using the main control module when undervoltage faults happen, and sends an alarm signal, so that external equipment of the frequency converter is automatically protected and accidents are prevented.
Description
Technical field
The utility model relates to a kind of low voltage frequency converter, is specifically related to a kind of low voltage frequency converter with under voltage protection function.
Background technology
Along with developing rapidly of modern power electronics technology and Computer Control Technology, promoted the technological revolution of electric drive.AC speed regulating replaces DC speed regulation, computer numerical control (CNC) replaces simulation control has become development trend.Frequency conversion and speed regulation of AC motor is current saves energy, improve the technological process of production, improve the quality of products and improve a kind of Main Means of running environment.Frequency control is with its high efficiency, High Power Factor and excellent speed governing and open the plurality of advantages such as braking ability and be known as the most rising mode of speed regulation both at home and abroad.
Frequency converter (VFD) is along with the needs of frequency control arise at the historic moment, it is application converter technique and microelectric technique, frequency by changing the machine operation power supply and the mode of amplitude are controlled the Electric Drive element of alternating current motor, are to utilize the on-off action of power semiconductor device power frequency supply to be transformed to the electric energy control device of another frequency.
In the low voltage frequency converter running, often can frequency converter under voltage fault in service appear because of reasons such as input voltage are abnormal.When the under voltage fault appears in low voltage frequency converter, if can not find the very first time and be processed, will damage frequency converter and external equipment, the production development accident.For protection low voltage frequency converter and external equipment, avoid the generation of production accident, a kind of low voltage frequency converter with under voltage protection function need be provided.
Summary of the invention
The utility model purpose is to provide a kind of low voltage frequency converter with under voltage protection function; automatically detect frequency converter under voltage fault, interrupt the output of frequency converter, send alarm signal simultaneously; automatically protection frequency converter and external equipment, avoid the generation of production accident.
For achieving the above object, the technical solution adopted in the utility model is: a kind of low voltage frequency converter with under voltage protection function comprises:
Gather and export the voltage signal acquisition module of the voltage signal of described low voltage frequency converter;
Receive described voltage signal and convert described voltage signal to the mould of digital signal output/number conversion module;
Receive described digital signal, and the signal fusing module of brownout signal is compared, exported to this digital signal and reference voltage signal;
Receive described brownout signal, control the main control module of described low voltage frequency converter power stage;
Described voltage signal acquisition module, mould/number conversion module, signal fusing module and main control module are electrically connected successively.
Preferably, described voltage signal acquisition module is the busbar voltage detection module.
In technique scheme, this low voltage frequency converter also comprises control panel, and described control panel is provided with LCDs, and the function code of described brownout signal and content are shown on this LCDs.
In technique scheme, this low voltage frequency converter also comprises with main control module electrical connection, receive the warning device of the alarm signal that described main control module sends.
Job step of the present utility model is as described below:
(1) utilize the voltage signal acquisition module to be sampled to the voltage signal of low voltage frequency converter;
(2) utilize mould/number conversion module that the voltage signal collected in step (1) is carried out to mould/number conversion;
(3) utilize the signal fusing module that the digital signal and the reference voltage signal that obtain in step (2) are compared, output brownout signal when described digital signal is less than reference voltage signal;
(4) brownout signal of the main control module receiving step (3) of low voltage frequency converter, the power stage of interruption low voltage frequency converter, low voltage frequency converter quits work;
(5) alarm module receives the alarm signal that main control module sends, warning staff low voltage frequency converter generation under voltage fault.
Because technique scheme is used, the advantage that the utility model compared with prior art has is:
1, can automatically detect the voltage signal acquisition module of frequency converter under voltage fault due to the utility model being provided with; and when occurring, the under voltage fault utilize main control module to interrupt the power stage of frequency converter; send alarm signal simultaneously; automatically protection frequency converter and external equipment, avoid the generation of production accident.
The accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment mono-;
Fig. 2 is the operation principle block diagram of embodiment mono-;
Wherein: 1, frequency converter casing; 2, panel 20, control panel 200, LCDs 3, frequency conversion input port 4, frequency conversion output port.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described:
Embodiment mono-: shown in Figure 1; a kind of low voltage frequency converter with under voltage protection function; the panel 2, the frequency conversion input port 3 of being located at frequency converter casing 1 one ends and the frequency conversion output port 4 that comprise frequency converter casing 1, be connected with described frequency converter casing 1, described panel 2 is provided with control panel 20.
In described frequency converter casing 1, be provided with:
Gather and export the voltage signal acquisition module of the voltage signal of described low voltage frequency converter;
Receive described voltage signal and convert described voltage signal to the mould of digital signal output/number conversion module;
Receive described digital signal, and the signal fusing module of brownout signal is compared, exported to this digital signal and reference voltage signal;
Receive described brownout signal, control the main control module of described low voltage frequency converter power stage;
With main control module electrical connection, receive the warning device of the alarm signal that described main control module sends;
Described voltage signal acquisition module, mould/number conversion module, signal fusing module and main control module are electrically connected successively.
In the present embodiment, described voltage signal acquisition module is the busbar voltage detection module.
Described control panel 20 is provided with LCDs 200, and the function code of described brownout signal and content are shown on this LCDs 200.
This have the under voltage protection function low voltage frequency converter the operation principle block diagram as shown in Figure 2, its job step is as described below:
(1) utilize the voltage signal acquisition module to be sampled to the voltage signal of low voltage frequency converter;
(2) utilize mould/number conversion module that the voltage signal collected in step (1) is carried out to mould/number conversion;
(3) utilize the signal fusing module that the digital signal and the reference voltage signal that obtain in step (2) are compared, output brownout signal when described digital signal is less than reference voltage signal;
(4) brownout signal of the main control module receiving step (3) of low voltage frequency converter, the power stage of interruption low voltage frequency converter, low voltage frequency converter quits work;
(5) alarm module receives the alarm signal that main control module sends, warning staff low voltage frequency converter generation under voltage fault.
Claims (2)
1. the low voltage frequency converter with under voltage protection function comprises:
Gather and export the voltage signal acquisition module of the voltage signal of described low voltage frequency converter;
Receive described voltage signal and convert described voltage signal to the mould of digital signal output/number conversion module;
Receive described digital signal, and the signal fusing module of brownout signal is compared, exported to this digital signal and reference voltage signal;
Receive described brownout signal, control the main control module of described low voltage frequency converter power stage;
Described voltage signal acquisition module, mould/number conversion module, signal fusing module and main control module are electrically connected successively; It is characterized in that, also comprise: with main control module electrical connection, receive the warning device of the alarm signal that described main control module sends.
2. the low voltage frequency converter with under voltage protection function according to claim 1, is characterized in that, described voltage signal acquisition module is the busbar voltage detection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206358577U CN203339935U (en) | 2012-11-26 | 2012-11-26 | Low-voltage frequency converter having undervoltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206358577U CN203339935U (en) | 2012-11-26 | 2012-11-26 | Low-voltage frequency converter having undervoltage protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203339935U true CN203339935U (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012206358577U Expired - Fee Related CN203339935U (en) | 2012-11-26 | 2012-11-26 | Low-voltage frequency converter having undervoltage protection function |
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| CN (1) | CN203339935U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200611A (en) * | 2016-06-23 | 2016-12-07 | 山东钢铁股份有限公司 | A kind of monitoring method of converter service condition |
-
2012
- 2012-11-26 CN CN2012206358577U patent/CN203339935U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200611A (en) * | 2016-06-23 | 2016-12-07 | 山东钢铁股份有限公司 | A kind of monitoring method of converter service condition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20151126 |