CN101969189A - Input over-voltage protection device of frequency converter - Google Patents
Input over-voltage protection device of frequency converter Download PDFInfo
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- CN101969189A CN101969189A CN2010105592572A CN201010559257A CN101969189A CN 101969189 A CN101969189 A CN 101969189A CN 2010105592572 A CN2010105592572 A CN 2010105592572A CN 201010559257 A CN201010559257 A CN 201010559257A CN 101969189 A CN101969189 A CN 101969189A
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- frequency converter
- voltage
- control module
- voltage detection
- detection module
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Abstract
The invention provides an input over-voltage protection device of a frequency converter and relates to an input terminal voltage protection device of the frequency converter. The input over-voltage protection device comprises a voltage detection module, a control module and a circuit breaking device, wherein the voltage detection module is used for detecting the voltage size of each phase of a three-phase power cord in front of the frequency converter; the control module is used for judging whether to cut off the circuit or not according to a detection signal of the voltage detection module; the circuit breaking device is used for starting the work of the circuit breaking device according to an instruction of the control module; the voltage detection module is a voltage transformer; a detection signal output by the voltage detection module is transmitted to the control module; the circuit breaking device is an alternate current contactor; and the coil of the alternate current contactor is connected with the control module which is a PLC (Programmable Logic Controller) controller. The invention is suitable for the over-voltage detection protection of the input end or over-voltage control of the switching function of an external circuit and can be independently applied to the input end of the power supply to achieve the protecting function; and thus, the input over-voltage protection device has the advantages of simple circuit lower implementation cost and higher reliability.
Description
Technical field
The present invention relates to the frequency converter protective device, specially refer 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.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of frequency converter input voltage that can in time detect and change, and in time cut off the input power cord of frequency converter.The present invention is achieved through the following technical solutions:
The present invention includes 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.
Beneficial effect of the present invention: the mistake pressure-controlled of protection that the present invention 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 present invention 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 present invention includes 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.
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 technical scheme of the present invention to be described, although the present invention 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 technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
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 claim 1 or 3 described frequency converter input overvoltage protections, 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 |
|---|---|---|---|
| CN2010105592572A CN101969189A (en) | 2010-11-25 | 2010-11-25 | Input over-voltage protection device of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105592572A CN101969189A (en) | 2010-11-25 | 2010-11-25 | Input over-voltage protection device of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101969189A true CN101969189A (en) | 2011-02-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105592572A Pending CN101969189A (en) | 2010-11-25 | 2010-11-25 | Input over-voltage protection device of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101969189A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051199A (en) * | 2013-01-21 | 2013-04-17 | 江苏力普电子科技有限公司 | High-voltage frequency converter with over-voltage protection function and over-voltage protection method of frequency converter |
| CN103722275A (en) * | 2013-12-04 | 2014-04-16 | 山东金阳矿业集团有限公司 | Energy-saving electric welding machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04125017A (en) * | 1990-09-13 | 1992-04-24 | Mitsubishi Electric Corp | Overvoltage protector for electric rolling stock |
| CN201975765U (en) * | 2010-11-25 | 2011-09-14 | 煤炭科学研究总院重庆研究院 | Frequency converter input overvoltage protection device |
-
2010
- 2010-11-25 CN CN2010105592572A patent/CN101969189A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04125017A (en) * | 1990-09-13 | 1992-04-24 | Mitsubishi Electric Corp | Overvoltage protector for electric rolling stock |
| CN201975765U (en) * | 2010-11-25 | 2011-09-14 | 煤炭科学研究总院重庆研究院 | Frequency converter input overvoltage protection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051199A (en) * | 2013-01-21 | 2013-04-17 | 江苏力普电子科技有限公司 | High-voltage frequency converter with over-voltage protection function and over-voltage protection method of frequency converter |
| CN103722275A (en) * | 2013-12-04 | 2014-04-16 | 山东金阳矿业集团有限公司 | Energy-saving electric welding machine |
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Application publication date: 20110209 |