CN204131101U - A kind of contactor protective device - Google Patents
A kind of contactor protective device Download PDFInfo
- Publication number
- CN204131101U CN204131101U CN201420423793.3U CN201420423793U CN204131101U CN 204131101 U CN204131101 U CN 204131101U CN 201420423793 U CN201420423793 U CN 201420423793U CN 204131101 U CN204131101 U CN 204131101U
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- Prior art keywords
- discharge
- contactor
- resistance
- relay
- parallel
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Abstract
The utility model provides a kind of contactor protective device; comprise relay, regulator rectifier circuit, discharge resistance and discharge capacity; the normally-closed contact of described relay is connected with discharge resistance; described discharge capacity is in parallel with discharge resistance; described relay normally-closed contact, discharge resistance and discharge capacity form discharge loop jointly; contactor coil is in parallel with described discharge loop; described regulator rectifier circuit is in parallel with discharge loop, and the voltage output end of regulator rectifier circuit is connected with relay for it is powered.The beneficial effects of the utility model can reduce system power dissipation eliminating D.C. contactor inverse electromotive force while.
Description
Technical field
The utility model belongs to electrical control gear field, especially relates to a kind of contactor protective device.
Background technology
In modern industry is produced, liquefied natural gas is as a kind of novel energy, has had and has applied more and more widely.But the thing followed increasing production safety problem also gradually highlight out.Owing to becoming fuel gas after liquefied natural gas gasifying, so also very strict to the control of gas-fired equipment.But no matter which type of control system all be unable to do without the most basic electric fittings, contactor is exactly the very high electric fittings of a kind of utilization rate, need to heat to combustion gas in producing, so heating power is all very large, the capacity of corresponding contactor also just becomes large.When control system requires will use D.C. contactor during safety and stability, but jumbo D.C. contactor coil can produce very strong inverse electromotive force in the moment of break-make, thus form the extra-high pressure of moment, extra-high pressure can arrive the 8-10 of normal voltage doubly, be easy to cause coil to puncture, have a strong impact on production safety, so increase a kind of inverse electromotive force absorption protective device just seem particularly important in the control system of the equipment of danger, in existing technology, a general piezo-resistance in parallel is to eliminate inverse electromotive force, but there is certain leakage current in piezo-resistance.There is technical problems such as increasing system power dissipation.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of contactor protective device, is especially suitable for the reverse voltage eliminating D.C. contactor.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of contactor protective device, comprise contactor, relay, regulator rectifier circuit, discharge resistance and discharge capacity, the normally-closed contact of described relay is connected with discharge resistance, described discharge capacity is in parallel with discharge resistance, described relay normally-closed contact, discharge resistance and discharge capacity form discharge loop jointly, contactor coil is in parallel with described discharge loop, described regulator rectifier circuit is in parallel with discharge loop, the voltage output end of regulator rectifier circuit is connected with relay for it is powered.
Further, described discharge resistance is piezo-resistance, and the puncture voltage of piezo-resistance is 420 ~ 517V.
Further, the capacitance of described discharge capacity is 0.05 ~ 0.3 μ F.
Further, also comprise power supply, start button, stop button, be connected with start button and stop button between contactor coil one end and described positive source, start button is in parallel with the auxiliary contact of contactor, and the contactor coil other end is connected with power cathode
The advantage that the utility model has and good effect are: owing to adopting technique scheme, can reduce system power dissipation while elimination D.C. contactor inverse electromotive force; There is the advantages such as energy-conservation, elimination inverse electromotive force is effective.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model
Embodiment
As shown in Figure 1, a kind of contactor protective device of the utility model, comprise relay M, regulator rectifier circuit 1, discharge resistance T and discharge capacity C, the normally-closed contact of relay M is connected with discharge resistance T, discharge capacity C is in parallel with discharge resistance T, relay M normally-closed contact, discharge resistance T and discharge capacity C form discharge loop jointly, contactor KM1 coil is in parallel with discharge loop, regulator rectifier circuit 1 is in parallel with discharge loop, and the voltage output end of regulator rectifier circuit 1 is connected with relay M for it is powered; Discharge resistance T is piezo-resistance, and the puncture voltage of piezo-resistance is 470V; The capacitance of discharge capacity C is 0.1 μ F; Also comprise power supply, start button SB1, stop button SB2, contactor KM1 coil one end be connected with the start button SB1 and stop button SB2 that connect between positive source, start button SB1 is in parallel with the auxiliary contact of contactor KM1, and the contactor KM1 coil other end is connected with power cathode.
The course of work of this example: press start button SB1, contactor KM1 obtains electric work, the auxiliary contact of contactor KM1 close, control circuit enters self-locking state, meanwhile regulator rectifier circuit 1 must electrician be powered as relay M, the normally-closed contact of relay M disconnects, contactor KM1 dead electricity after stop button SB2 presses, simultaneously regulator rectifier circuit 1 also dead electricity stop powering for relay M, the normally-closed contact of relay M closes conducting discharge loop, first the superelevation reverse voltage at contactor KM1 coil two ends bleeds off peak current by the discharge capacity C on discharge loop, the voltage of remainder is discharged with the form of heat by discharge resistance T, thus the coil of protection contactor KM1, it is avoided to be punctured by superelevation reverse voltage.
Above an embodiment of the present utility model has been described in detail, but described content being only preferred embodiment of the present utility model, can not being considered to for limiting practical range of the present utility model.All equalizations done according to the utility model application range change and improve, and all should still belong within patent covering scope of the present utility model.
Claims (4)
1. a contactor protective device; it is characterized in that: comprise relay, regulator rectifier circuit, discharge resistance and discharge capacity; the normally-closed contact of described relay is connected with discharge resistance; described discharge capacity is in parallel with discharge resistance; described relay normally-closed contact, discharge resistance and discharge capacity form discharge loop jointly; contactor coil is in parallel with described discharge loop; described regulator rectifier circuit is in parallel with discharge loop, and the voltage output end of regulator rectifier circuit is connected with relay for it is powered.
2. protective device according to claim 1, is characterized in that: described discharge resistance is piezo-resistance, and the puncture voltage of piezo-resistance is 420 ~ 517V.
3. protective device according to claim 1, is characterized in that: the capacitance of described discharge capacity is 0.05 ~ 0.3 μ F.
4. protective device according to claim 1; it is characterized in that: also comprise power supply, start button, stop button; contactor coil one end be connected with the start button and stop button of connecting between positive source; start button is in parallel with the auxiliary contact of contactor, and the contactor coil other end is connected with power cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420423793.3U CN204131101U (en) | 2014-07-29 | 2014-07-29 | A kind of contactor protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420423793.3U CN204131101U (en) | 2014-07-29 | 2014-07-29 | A kind of contactor protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131101U true CN204131101U (en) | 2015-01-28 |
Family
ID=52387422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420423793.3U Expired - Fee Related CN204131101U (en) | 2014-07-29 | 2014-07-29 | A kind of contactor protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131101U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230096893A1 (en) * | 2020-03-26 | 2023-03-30 | Mitsubishi Electric Corporation | Power conversion device |
-
2014
- 2014-07-29 CN CN201420423793.3U patent/CN204131101U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230096893A1 (en) * | 2020-03-26 | 2023-03-30 | Mitsubishi Electric Corporation | Power conversion device |
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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: 20150128 Termination date: 20150729 |
|
| EXPY | Termination of patent right or utility model |