CN101562093A - Method and circuit for automatically disconnecting contactor at power failure - Google Patents
Method and circuit for automatically disconnecting contactor at power failure Download PDFInfo
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- CN101562093A CN101562093A CNA2009100846300A CN200910084630A CN101562093A CN 101562093 A CN101562093 A CN 101562093A CN A2009100846300 A CNA2009100846300 A CN A2009100846300A CN 200910084630 A CN200910084630 A CN 200910084630A CN 101562093 A CN101562093 A CN 101562093A
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- contactor
- circuit
- electric energy
- automatic disconnection
- energy storage
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Abstract
The invention discloses a method and a circuit for automatically disconnecting a contactor for protection at power failure, wherein the circuit comprises an energy storage capacitor, a logic control circuit and a switch drive circuit. The switch drive circuit is connected with an electric energy storage unit which can be used for storing energy when being electrified; and when the power is off, the electric energy storage unit releases electric energy to achieve the automatic disconnection of the contactor, and the disconnection is reliable and can avoid accidental operations of a relay. When a device has sudden power failure and a system cannot work normally, a power network can be prevented from being impacted by overburden current when the device is electrified next time, and an extra power supply is omitted.
Description
Technical field
The present invention relates to a kind of switch outage automatic disconnection resist technology, relate in particular to a kind of method and circuit of contactor outage automatic disconnection protection.
Background technology
In an application at magnetic latching contactor---the low-voltage reactive power compensation capacitor, require that contactor must disconnect after the device looses power, otherwise have the moment overload current when powering on next time.
In the prior art, a difficult point is arranged in the application of magnetic latching contactor, promptly on off state is kept after the outage, but in a lot of occasions, requires contactor to disconnect after the equipment sudden power, and the characteristic that magnetic keeps requirement again must have reverse drive signals just can disconnect.
There is following shortcoming at least in above-mentioned prior art:
The instability of input voltage can cause relay misoperation.
Summary of the invention
Can reliably disconnect, avoid the method and the circuit of the contactor outage automatic disconnection protection of relay misoperation when the purpose of this invention is to provide a kind of the outage.
The objective of the invention is to be achieved through the following technical solutions:
The circuit of contactor outage automatic disconnection protection of the present invention comprises switch driving circuit, and described switch driving circuit is connected with electric energy-accumulating element.
The method of contactor outage automatic disconnection protection of the present invention comprises by the accumulation of energy when electricity is arranged of electric energy-accumulating element; When outage, described electric energy storage unit releases electric energy realizes the contactor automatic disconnection.
As seen from the above technical solution provided by the invention, the method and the circuit of contactor outage automatic disconnection protection of the present invention, because switch driving circuit is connected with electric energy-accumulating element, can be by the accumulation of energy when electricity is arranged of electric energy-accumulating element; When outage, electric energy storage unit releases electric energy realizes the contactor automatic disconnection, disconnects reliably, can avoid relay misoperation.
Description of drawings
Fig. 1 is the theory diagram of contactor outage automatic disconnection protective circuit among the present invention;
Fig. 2 is the schematic diagram of contactor outage automatic disconnection protective circuit in the specific embodiments of the invention.
Embodiment
The circuit of contactor outage automatic disconnection protection of the present invention, its preferable embodiment comprises switch driving circuit as shown in Figure 1, switch driving circuit is connected with electric energy-accumulating element.
Electric energy-accumulating element can be connected with switch driving circuit by logic drive circuit.
Concrete logic drive circuit can comprise chip for driving, and electric energy-accumulating element can be energy storage capacitor.Can on input that chip for driving is connected with switch driving circuit, outlet line, be parallel with energy storage capacitor respectively.
The method of contactor outage automatic disconnection protection of the present invention, its preferable embodiment is to comprise by the accumulation of energy when electricity is arranged of electric energy-accumulating element; When outage, electric energy storage unit releases electric energy realizes the contactor automatic disconnection.
Specific embodiment, as shown in Figure 2:
The drive circuit of contactor is the 12V direct current, and design logic control circuit and drive circuit all are the 12V power supply.Single-chip processor i/o is exported to first order drive circuit, and the chip for driving of actual contact device is the 3.3V input, with the electric resistance partial pressure mode 12V input voltage is divided into 3.3V.The triode B utmost point adds the disconnection of low level driving contactor during operate as normal, and the B utmost point adds high level and drives the contactor closure.When device powers down, because the existence of storage capacitor, 12V is slower than 5V decline, and when single-chip processor i/o can't keep the triode conducting, the contactor logic appearred disconnecting in logical circuit, and chip for driving utilizes dump energy to disconnect contactor.
Among the present invention, circuit has storage capacitor, logic control circuit, 3 parts of switch driving circuit, electric capacity is charging in the equipment operate as normal, when device powers down, logic control circuit and switch driving circuit utilize the accumulate of electric capacity, finish to disconnect action, realize the contactor automatic disconnection, disconnect reliably, can avoid relay misoperation.In the unexpected power down of equipment, when system can't operate as normal, electric current was crossed the large impact electrical network in the time of can avoiding powering on next time, and does not need extra power supply to give altogether.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (5)
1, a kind of circuit of contactor outage automatic disconnection protection comprises switch driving circuit, it is characterized in that described switch driving circuit is connected with electric energy-accumulating element.
2, contactor outage automatic disconnection protective circuit according to claim 1 is characterized in that described electric energy-accumulating element is connected with described switch driving circuit by logic drive circuit.
3, contactor outage automatic disconnection protective circuit according to claim 2 is characterized in that described logic drive circuit comprises chip for driving, and described electric energy-accumulating element is an energy storage capacitor.
4, contactor outage automatic disconnection protective circuit according to claim 3 is characterized in that, is parallel with described energy storage capacitor respectively on the input that described chip for driving is connected with described switch driving circuit, the outlet line.
5, a kind of method of contactor outage automatic disconnection protection is characterized in that, comprises by the accumulation of energy when electricity is arranged of electric energy-accumulating element; When outage, described electric energy storage unit releases electric energy realizes the contactor automatic disconnection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100846300A CN101562093A (en) | 2009-05-18 | 2009-05-18 | Method and circuit for automatically disconnecting contactor at power failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100846300A CN101562093A (en) | 2009-05-18 | 2009-05-18 | Method and circuit for automatically disconnecting contactor at power failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101562093A true CN101562093A (en) | 2009-10-21 |
Family
ID=41220841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100846300A Pending CN101562093A (en) | 2009-05-18 | 2009-05-18 | Method and circuit for automatically disconnecting contactor at power failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101562093A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034647A (en) * | 2010-12-15 | 2011-04-27 | 黑龙江省电力科学研究院 | Electric switch for automatic power interruption by fault in minimum interval |
| CN103594288A (en) * | 2012-08-17 | 2014-02-19 | 光宝电子(广州)有限公司 | Relay driving device and driving method thereof |
| CN104184314B (en) * | 2014-09-05 | 2017-09-08 | 山东华芯电子有限公司 | A kind of energy-storage travelling wave tube power-off automatic discharge circuit and its charging method |
-
2009
- 2009-05-18 CN CNA2009100846300A patent/CN101562093A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034647A (en) * | 2010-12-15 | 2011-04-27 | 黑龙江省电力科学研究院 | Electric switch for automatic power interruption by fault in minimum interval |
| CN102034647B (en) * | 2010-12-15 | 2012-10-24 | 黑龙江省电力科学研究院 | Electric switch for automatic power interruption by fault in minimum interval |
| CN103594288A (en) * | 2012-08-17 | 2014-02-19 | 光宝电子(广州)有限公司 | Relay driving device and driving method thereof |
| CN103594288B (en) * | 2012-08-17 | 2015-07-29 | 光宝电子(广州)有限公司 | Relay controller and driving method thereof |
| CN104184314B (en) * | 2014-09-05 | 2017-09-08 | 山东华芯电子有限公司 | A kind of energy-storage travelling wave tube power-off automatic discharge circuit and its charging method |
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Open date: 20091021 |