CN212461525U - Contact protection circuit of electromagnetic relay - Google Patents
Contact protection circuit of electromagnetic relay Download PDFInfo
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- CN212461525U CN212461525U CN202021567029.5U CN202021567029U CN212461525U CN 212461525 U CN212461525 U CN 212461525U CN 202021567029 U CN202021567029 U CN 202021567029U CN 212461525 U CN212461525 U CN 212461525U
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Abstract
The utility model discloses an electromagnetic relay contact protection circuit, which comprises an input terminal, an output terminal and a load relay, wherein the load relay is connected in series in a loop between the input terminal and the output terminal, and controls the on/off of the loop through the action of a self contact; a protection sub-circuit which is connected with the load relay in parallel to protect the load relay is also connected in a loop between the input terminal and the output terminal; the protection sub-circuit at least comprises an auxiliary relay and a switch element without a contact which are connected in series, and the on/off of the protection sub-circuit is controlled in a matching way through the action of the contact of the auxiliary relay and the on/off of the switch element. The utility model has the advantages of it is following and effect: the electromagnetic relay can effectively prevent the electric spark generation when the electromagnetic relay is opened and closed, prolongs the service life and has complete isolation after power failure.
Description
Technical Field
The utility model relates to a relay technical field, in particular to electromagnetic relay contact protection circuit.
Background
An electromagnetic relay is an electronic control device, usually used in automatic control circuits, and is actually an "automatic switch" that uses a smaller current and a lower voltage to control a larger current and a higher voltage.
At present, a normally open contact control circuit of an electromagnetic relay is generally adopted, when a contact has transient heavy current when a load is connected or disconnected, electric sparks are generated, the service life of the electromagnetic relay is short, the electromagnetic relay is frequently replaced, the work time is easily delayed,
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electromagnetic relay contact protection circuit to solve the problem that proposes among the background art.
The above technical purpose of the present invention can be achieved by the following technical solutions: a kind of electromagnetic relay contact protective circuit, including input terminal, output terminal and load relay, the said load relay connects in series in the return circuit between input terminal and output terminal, and control the on/off of the return circuit through the movements of the contact of oneself; a protection sub-circuit which is connected with the load relay in parallel to protect the load relay is also connected in a loop between the input terminal and the output terminal; the protection sub-circuit at least comprises an auxiliary relay and a switch element without a contact which are connected in series, and the on/off of the protection sub-circuit is controlled by the action of the contact of the auxiliary relay and the on/off of the switch element in a matching way.
The further setting is that: the switch element is a power switch tube.
The beneficial effects of the utility model reside in that: the traditional electromagnetic relay can generate electric sparks and oxidize contacts when being normally switched on, so that the service life is influenced. In the utility model, the two ends of the load relay are connected with the protection sub-circuit in parallel, the protection sub-circuit comprises the auxiliary relay and the switch element, the switch element does not have a contact, and no spark is generated during normal on-off; the utility model discloses lie in: 1. the load relay switches on the auxiliary relay and the switch element before switching on and switching off (ensuring that the contact has no spark when the load relay is switched on); 2. the load relay turns off the switch tube and the auxiliary relay after being switched on (so that the load relay is prevented from being burnt out due to the fact that a load circuit is always added on a switch element when a contact of the load relay is poor or is not switched on); 3. the load relay turns off the switch tube and the auxiliary relay after being turned off (complete disconnection and isolation of the load and energy consumption loss are realized). Therefore, electric sparks of the load relay and the auxiliary relay are effectively prevented from being generated under the conditions of power-on and power-off, the contact of the load relay is protected, the service life of the relay is prolonged, and complete power-off isolation of the load is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
In the figure: 1. an input terminal; 2. an output terminal; 3. a load relay; 41. an auxiliary relay; 42. a switching element.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the contact protection circuit of an electromagnetic relay comprises an input terminal 1, an output terminal 2 and a load relay 3, wherein the load relay 3 is connected in series in a loop between the input terminal 1 and the output terminal 2, and controls the on/off of the loop through the action of a contact of the load relay.
A protection sub-circuit which is connected with the load relay 3 in parallel to protect the load relay 3 is also connected in a loop between the input terminal 1 and the output terminal 2;
the protection sub-circuit at least comprises an auxiliary relay 41 and a switch element 42 without contact which are connected in series, and the on/off of the protection sub-circuit is controlled by the action of the contact of the auxiliary relay 41 and the on/off of the switch element 42.
The switching element 42 is a power switching tube, specifically, a thyristor, an MOS tube, etc., and the power switching tube is used as a switch to connect and disconnect a loop in this embodiment, so as to eliminate electric arcs and electric sparks; the auxiliary relay 41 plays a role of power-on and power-off isolation.
It should be noted that the load relay 3, the auxiliary relay 41 and the switch element 42 in this embodiment can be controlled to be turned on or off by being connected to a single chip, and the connection with the single chip belongs to the field of the prior art. Input terminal 1 is designated T1 in the drawing; output terminal 2 is designated L1 in the drawing; the load relay 3 is denoted as K2 in the drawing; the auxiliary relay 41 is designated as K1 in the drawing; the switching element 42 is designated Q1 in the drawing.
The working process of the embodiment is as follows:
firstly, starting; first, the auxiliary relay 41 is turned on in advance, and then the switching element 42 is turned on, so that the generation of the electric spark of the auxiliary relay 41 is effectively prevented, and then the load relay 3 is turned on, so that the electric spark is not generated in the load relay 3 in the case of being turned on, thereby protecting the normal turn-on of the load relay 3.
Secondly, stabilizing the state; the load relay 3 is turned on to carry the current load, and then the switching element 42 is turned off (to prevent the switching element 42 from being burned out due to heat generation caused by the current constantly applied to the switching element 42 by the contact of the load relay 41 being turned on poorly or not being turned on).
And thirdly, closing: when the closing signal comes, the auxiliary relay 41 is turned on, then the switching tube 42 is turned on, and then the load relay 3 is turned off.
After closing: after the load relay 3 is turned off, the switching element 42 is turned off first, and then the auxiliary relay 41 is turned off (complete isolation and loss of power consumption of the load circuit are achieved).
The contact protection circuit of the electromagnetic relay disclosed by the embodiment can be suitable for controlling the on-off interval time of the voltage to be not less than 1 second for on and off for 1 second; and the circuit needs to be powered on and then powered off.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (2)
1. A kind of electromagnetic relay contact protective circuit, including input terminal (1), output terminal (2) and load relay (3), the said load relay (3) connects in series in the return circuit between input terminal (1) and output terminal (2), and control the on/off of the return circuit through the movements of the contact of oneself; the method is characterized in that:
a protection sub-circuit which is connected with the load relay (3) in parallel to protect the load relay (3) is also connected in a loop between the input terminal (1) and the output terminal (2);
the protection sub-circuit at least comprises an auxiliary relay (41) and a switch element (42) without a contact point, wherein the auxiliary relay (41) is connected in series, and the on/off of the protection sub-circuit is controlled in a matched mode through the action of the contact point of the auxiliary relay (41) and the on/off of the switch element (42).
2. An electromagnetic relay contact protection circuit according to claim 1, characterized in that: the switch element (42) is a power switch tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021567029.5U CN212461525U (en) | 2020-07-31 | 2020-07-31 | Contact protection circuit of electromagnetic relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021567029.5U CN212461525U (en) | 2020-07-31 | 2020-07-31 | Contact protection circuit of electromagnetic relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212461525U true CN212461525U (en) | 2021-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021567029.5U Active CN212461525U (en) | 2020-07-31 | 2020-07-31 | Contact protection circuit of electromagnetic relay |
Country Status (1)
| Country | Link |
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| CN (1) | CN212461525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022896A (en) * | 2021-03-26 | 2021-06-25 | 上海卫星工程研究所 | Hot knife unblock drive circuit device |
-
2020
- 2020-07-31 CN CN202021567029.5U patent/CN212461525U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022896A (en) * | 2021-03-26 | 2021-06-25 | 上海卫星工程研究所 | Hot knife unblock drive circuit device |
| CN113022896B (en) * | 2021-03-26 | 2022-12-13 | 上海卫星工程研究所 | Hot knife unblock drive circuit device |
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