CN201975765U - Frequency converter input overvoltage protection device - Google Patents
Frequency converter input overvoltage protection device Download PDFInfo
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- CN201975765U CN201975765U CN2010206247787U CN201020624778U CN201975765U CN 201975765 U CN201975765 U CN 201975765U CN 2010206247787 U CN2010206247787 U CN 2010206247787U CN 201020624778 U CN201020624778 U CN 201020624778U CN 201975765 U CN201975765 U CN 201975765U
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- frequency converter
- control module
- voltage
- voltage detection
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Abstract
The utility model discloses a frequency converter input overvoltage protection device and relates to a voltage protection device at the input end of a frequency converter. The device comprises a voltage detection module, a control module and a shutdown device, wherein the voltage detection module is used for detecting the voltage of each of the first three phases of power cords of a frequency converter, the control module is used for judging whether switching off is performed or not according to detection signals of the voltage detection module, and the shutdown starts to work according to the commands of the control module; the voltage detection module is a voltage transformer, and the output detection signals of the voltage detection module are transmitted to the control module; the shutdown device is an AC (alternating current) contactor, and the coil of the AC contactor is connected with the control module; and the control module is a PLC (programmable logic controller). The device provided by the utility model is suitable for detection protection in case of overvoltage at a power supply input end or overvoltage control to the switching function of an external circuit, and can be independently used at the power supply input terminal for achieving the required protecting function. Therefore, the device has the advantages of simple circuit, lower cost and higher reliability.
Description
Technical field
The utility model relates to the frequency converter protective device, specially refers to frequency converter input terminal voltage protective device.
Background technology
Converter technology applies in the industrial production control widely, has greatly improved the overall efficiency of producing, and is damaged when work is turned round in order to prevent electric equipment, so the stability of electrical installation is had higher requirement; Usually in the electric equipment safety system, most situations all are to consider the work of motor, occur overcurrent easily such as motor in start-up course, and make situations such as motor is damaged; Same frequency converter in use also often is subjected to the influence of instantaneous voltage fluctuation; and frequency converter is special again high to the requirement of running environment; especially at coal mine work area; motor uses very concentrated; the operational environment very severe is shut down so not only cause frequency converter easily, and even more serious is possible cause the serious consequence of burning frequency converter; again because the frequency converter price is very expensive, so the protection of frequency converter is just seemed extremely important and urgent.
Protection to frequency converter in the prior art generally is at the added load of frequency converter; can cause that such as the load short circuits phenomenon current of electric is excessive; also have to frequency converter input and install filter additional; can effectively suppress the conducted interference of frequency converter to electrical network, can be comparatively less for disturbance voltage on the electrical network to the influence research that frequency converter causes.
Therefore need a kind of input power cord that when the frequency converter input voltage changes above certain threshold value, cuts off automatically to protect frequency converter not to be damaged with this.
The utility model content
In view of this, the purpose of this utility model provides a kind of frequency converter input voltage that can in time detect and changes, and in time cuts off the input power cord of frequency converter.The utility model is achieved through the following technical solutions:
The utility model comprises voltage detection module, control module and tripper;
Described voltage detection module is used to detect each the phase voltage size on the frequency converter three-phase power line;
Described control module judges whether to cut off circuit according to the detection signal of voltage detection module;
Described tripper is connected between frequency converter and the power line, starts the work of tripper according to the instruction of control module.
Further, described voltage detection module is a voltage transformer, and the detection signal of its output is transferred to described control module.
Further, the described tripper A.C. contactor that is.
Further, the coil of described A.C. contactor is connected with control module.
Further, described control module is the PLC controller.
The beneficial effects of the utility model: the mistake pressure-controlled of protection that the utility model detects when being fit to be applied to the power input overvoltage or external circuit handoff functionality; can be used in power input separately and realize its claimed function, thereby it is simple and realize the advantage of the low and higher reliability of cost to have a circuit.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is the functional block diagram of frequency converter input overvoltage protection;
Fig. 2 is the circuit theory diagrams of frequency converter input overvoltage protection.
Embodiment
Fig. 1 is the functional block diagram of frequency converter input overvoltage protection; As shown in the figure, the utility model comprises voltage detection module, control module and tripper; Described voltage detection module is used to detect each the phase voltage size on the frequency converter 4 three-phase power lines; Described control module judges whether to cut off circuit according to the detection signal of voltage detection module; Described tripper is connected between frequency converter 4 and the power line, starts the work of tripper according to the instruction of control module.
Fig. 2 is the circuit theory diagrams of frequency converter input overvoltage protection; As shown in the figure, voltage detection module is a voltage transformer 2, and the detection signal of its output is transferred to described control module.The A.C. contactor 1 that described tripper is.The coil of A.C. contactor 1 is connected with control module.
Described control module is the PLC controller.Controller inside is provided with the voltage computing module, compares according to the signal of voltage check device collection and default magnitude of voltage, judges that whether change in voltage surpasses this preset value, controls A.C. contactor then
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (5)
1. frequency converter input overvoltage protection is characterized in that: comprise voltage detection module, control module and tripper;
Described voltage detection module is used to detect each the phase voltage size on frequency converter (4) the three-phase power line;
Described control module judges whether to cut off circuit according to the detection signal of voltage detection module;
Described tripper is connected between frequency converter (4) and the power line, starts according to the instruction of control module, cuts off converter power supply.
2. according to the described frequency converter input of claim 1 overvoltage protection, it is characterized in that: described voltage detection module is voltage transformer (2), and its detection signal transmission ends links to each other with control module.
3. according to the described frequency converter input of claim 1 overvoltage protection, it is characterized in that: described tripper is A.C. contactor (1).
4. according to the described frequency converter input of claim 3 overvoltage protection, it is characterized in that: the power on/off of the coil of described A.C. contactor (1) is controlled by control module.
5. according to the described frequency converter input of claim 1 overvoltage protection, it is characterized in that: described control module is the PLC controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206247787U CN201975765U (en) | 2010-11-25 | 2010-11-25 | Frequency converter input overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206247787U CN201975765U (en) | 2010-11-25 | 2010-11-25 | Frequency converter input overvoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201975765U true CN201975765U (en) | 2011-09-14 |
Family
ID=44580862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206247787U Expired - Fee Related CN201975765U (en) | 2010-11-25 | 2010-11-25 | Frequency converter input overvoltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201975765U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969189A (en) * | 2010-11-25 | 2011-02-09 | 煤炭科学研究总院重庆研究院 | Input over-voltage protection device of frequency converter |
-
2010
- 2010-11-25 CN CN2010206247787U patent/CN201975765U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969189A (en) * | 2010-11-25 | 2011-02-09 | 煤炭科学研究总院重庆研究院 | Input over-voltage protection device of frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA COAL TECHNOLOGY ENGINEERING GROUP CHONGQING Free format text: FORMER NAME: CHINA COAL SCIENCE AND INDUSTRY GROUP CHONGQING RESEARCH INSTITUTE Owner name: CHINA COAL SCIENCE AND INDUSTRY GROUP CHONGQING RE Free format text: FORMER NAME: COAL SCIENTIFIC RESEARCH INSTITUTE CHONGQING INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 400037, No. three village, 55 bridge, Shapingba District, Chongqing Patentee after: Chongqing Research Institute of China Coal Technology & Engineering Group Corp. Address before: 400037, No. three village, 55 bridge, Shapingba District, Chongqing Patentee before: Chongqing Institute of Coal Science Research Institute |
|
| CP03 | Change of name, title or address |
Address after: 400039 Chongqing Jiulongpo Branch City Road No. 6 Patentee after: CHONGQING RESEARCH INSTITUTE CO., LTD. OF CHINA COAL TECHNOLOGY & ENGINEERING Group Address before: 400037, No. three village, 55 bridge, Shapingba District, Chongqing Patentee before: Chongqing Research Institute of China Coal Technology & Engineering Group Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20151125 |