CN211238104U - Circuit for inhibiting contact adhesion of relay switch - Google Patents
Circuit for inhibiting contact adhesion of relay switch Download PDFInfo
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- CN211238104U CN211238104U CN201921972270.3U CN201921972270U CN211238104U CN 211238104 U CN211238104 U CN 211238104U CN 201921972270 U CN201921972270 U CN 201921972270U CN 211238104 U CN211238104 U CN 211238104U
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Abstract
The utility model relates to a battery charging outfit technical field, concretely relates to suppression circuit of relay switch contact adhesion, its include with the relay that first power module is connected, with input and output that the relay is connected, locate the relay with suppress surge circuit module between the output, locate the input with absorption arc circuit module between the output, with the control module that the relay is connected, absorption arc circuit module with the relay is parallelly connected, the input is connected with second power module, the output is connected with the load. By the mode, the output part and the input part of the relay can be protected simultaneously, the phenomenon of adhesion of the switch contact of the relay can be inhibited by double insurance, the full compatibility of the output of the relay to the load (resistance, sensitivity and capacitance) can be met, the interference on a power circuit can be reduced, and the reliability of a product in use can be improved.
Description
Technical Field
The utility model relates to a battery charging outfit technical field, concretely relates to suppression circuit of relay switch contact adhesion.
Background
As an electrical control element, relays play a fundamental and important role in many fields, and in turn, higher demands are placed on the durability of relays. Historical failure statistics indicate that contact system failure is the primary form of relay failure, and therefore improving contact system failure is particularly important for improving the durability of the relay. Due to the diversity of loads (resistive + capacitive + inductive), the connection relationship between the contact and the movable reed is gradually deteriorated along with the increase of the working times due to arc discharge or surge current impact generated based on the output of the loads, so that adhesion is caused due to damage, and safety accidents such as personal electric shock, circuit short circuit, electric burning and even fire disaster can be caused. How to inhibit the relay contact from adhering and ensure the durability of the frequent action and use of the relay is always a difficult problem in the field of charging.
At present, the contacts of the electromagnetic relay commonly used in China are mostly made of silver tin oxide (AgSnO2) materials, the adhesion fault probability among the contacts can also be reduced, the excitation coil and the diode are input into the relay for follow current, the input part of the relay is only protected, and the traditional relay output circuit only suppresses the impact caused by inductive load by connecting RCD in series. However, the field load and the severe environment are unknown, and the adhesion phenomenon is easy to occur after the frequent switching actions of the relay contact are increased.
In view of the above, it is an urgent technical problem in the art to provide a novel circuit for suppressing the contact adhesion of a relay switch.
Disclosure of Invention
An object of the utility model is to provide an inhibitor circuit of relay switch contact adhesion to prior art's above-mentioned defect.
The purpose of the utility model can be realized by the following technical measures:
an embodiment of the utility model provides a suppression circuit of relay switch contact adhesion, this suppression circuit includes:
the relay is connected with the first power supply module;
the input end is connected with the second power supply module, and the output end is connected with a load;
the surge suppression circuit module is arranged between the relay and the output end and is used for absorbing surge current generated by the contact at the moment of closing the relay;
the arc absorption circuit module is arranged between the input end and the output end, is connected with the relay in parallel and is used for absorbing the arc generated by the contact at the moment of turning off the relay;
and the control module is connected with the relay and is used for controlling the turn-off/suction of the relay.
According to an embodiment of the present invention, the arc absorption circuit module includes a high voltage capacitor.
According to an embodiment of the present invention, the surge suppression circuit module includes a thermistor.
According to the utility model discloses an embodiment, control module includes singlechip, triode, first resistance and second resistance, the base of triode passes through first resistance with the singlechip is connected, the collecting electrode of triode with the relay is connected, the projecting pole of triode with the base cross-over connection the second resistance, the projecting pole ground connection of triode.
According to an embodiment of the present invention, the load includes: one or more of resistive, inductive, and capacitive loads.
According to the utility model discloses an embodiment, first power module is DC power supply, second power module is alternating current power supply.
According to the utility model discloses an embodiment, the relay includes coil, first contact and second contact, first contact with the input is connected, the second contact with the output is connected, the coil with control module connects.
According to the utility model discloses an embodiment, the suppression circuit still include with the afterflow return circuit module of coil connection when the relay is turn-off, afterflow return circuit module releases the electric energy of coil storage.
According to the utility model discloses an embodiment, afterflow loop module includes: the coil comprises a first diode, a second diode and a third resistor, wherein one end of the third resistor is connected with one end of the coil, the other end of the third resistor is connected with the other end of the coil through the second diode, one end of the first diode is connected with the second diode, and the other end of the first diode is connected with the third resistor.
According to an embodiment of the present invention, the second diode is a light emitting diode for indicating the energy storage state of the coil.
The utility model discloses suppression circuit of relay switch contact adhesion not only can absorb the electric arc and strike, can also absorb the surge current and strike, realizes that dual fail safe restraines relay switch contact and takes place the adhesion phenomenon, satisfies the relay output and to the full compatibility of load (hindering nature, perception, capacitive), reduces the interference that power supply circuit received, increases the reliability of product when using.
Drawings
Fig. 1 is a schematic diagram of a circuit structure for suppressing contact adhesion of a relay switch according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a circuit structure for suppressing contact adhesion of a relay switch according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following, many aspects of the present invention will be better understood with reference to the drawings. The components in the drawings are not necessarily to scale. Instead, emphasis is placed upon clearly illustrating the components of the present invention. Moreover, in the several views of the drawings, like reference numerals designate corresponding parts.
The word "exemplary" or "illustrative" as used herein means serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other embodiments. All of the embodiments described below are exemplary embodiments provided to enable persons skilled in the art to make and use the examples of the disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. In other instances, well-known features and methods have been described in detail so as not to obscure the invention. For purposes of the description herein, the terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," and derivatives thereof shall relate to the invention as oriented in fig. 1. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.
Fig. 1 is a schematic diagram of a structure of a suppression circuit for relay switch contact adhesion according to a first embodiment of the present invention, please refer to fig. 1, the suppression circuit includes: relay 10, input 20, output 30, surge suppression circuit module 40, arc absorption circuit module 50, and control module 60.
Wherein, the relay 10 is connected with a first power supply module 1, further, the relay 10 includes a coil 101, a first contact 102 and a second contact 103, the first power supply module 1 provides energy for the normal operation of the relay 10, and preferably, the first power supply module 1 is a dc power supply and provides dc power.
The input 20 is connected to a first contact 102 and the output 30 is connected to a second contact 103. The input end 20 is connected with a second power supply module (not shown in the figure), and the output end 30 is connected with a load (not shown in the figure); when the switch of the relay 10 is switched on, the input terminal 20 and the output terminal 30 are in a connected state, the second power supply module inputs electric energy through the input terminal 20 to provide energy for the load of the output terminal 30, and when the switch of the relay 10 is switched off, the input terminal 20 and the output terminal 30 are in a disconnected state, and the electric energy of the input terminal 20 cannot be normally transmitted to the output terminal 30. Preferably, the second power supply module is an alternating current power supply and provides alternating current power.
Further, the load includes: one or more of resistive, inductive, and capacitive loads. When the load connected to the output terminal 30 is an inductive load, the instantaneous contact point of the relay 10 is turned off to generate a large arc, and when the load connected to the output terminal 30 is a capacitive load and/or a resistive load, the instantaneous contact point of the relay 10 is turned on to generate a surge current.
Further, referring to fig. 1, the surge suppression circuit module 40 is disposed between the second contact 103 of the relay 10 and the output terminal 30, and is configured to absorb a surge current generated by the contact at the moment when the relay 10 is turned off; further, the surge suppressing circuit module 40 includes a thermistor RT.
The arc absorption circuit module 50 is arranged between the input end 20 and the output end 30, the arc absorption circuit module 50 is connected with the relay 10 in parallel, furthermore, one end of the arc absorption circuit module 50 is connected between the first contact 102 of the relay 10 and the input end 20, and the other end is connected between the second contact 103 of the relay 10 and the surge suppression circuit module 40, and is used for absorbing the arc generated by the contacts at the moment of turning off the relay 10; further, the arc absorption circuit module 50 includes a high voltage capacitor C.
The control module 60 is connected with the coil 101 of the relay 10 and is used for controlling the relay 10 to be switched off/on.
When the output end 30 is an inductive load, the control module 60 controls the relay 10 to turn off the instantaneous contact, so that a large arc can be generated, and the arc is absorbed by the high-voltage capacitor C loop; when the output end 30 is a capacitive load and/or a resistive load, the control module 60 controls the relay 10 to close the instantaneous contact point to generate surge current, and the surge current is absorbed by the thermistor RT; when the output terminal 30 is an (inductive + capacitive and/or resistive) load, the control module 60 controls the relay 10 to be turned off/on, and the high-voltage capacitor C and the thermistor RT can both play a role in protection, thereby effectively inhibiting the adhesion of the relay 10.
Further, referring to fig. 1, the control module 60 includes a single chip 601, a transistor 602, a first resistor 603 and a second resistor 604, a base of the transistor 602 is connected to the single chip 601 through the first resistor 603, a collector of the transistor 602 is connected to the relay 10, an emitter and a base of the transistor 602 are connected across the second resistor 604, and an emitter of the transistor 602 is grounded.
The utility model discloses the suppression circuit of relay 10 switch contact adhesion of first embodiment not only can absorb the electric arc impact that comes from the inductive load production, can also absorb the surge current impact that comes from capacitive load and/or resistive load production, realizes that dual insurance suppresses relay 10 switch contact and takes place the adhesion phenomenon, satisfies relay 10 output and to the full compatibility of load (resistive nature, perception, capacitive), reduces the interference that power supply circuit received, increases the reliability of product when using.
Fig. 2 is a schematic diagram of a structure of a circuit for suppressing the adhesion of the switch contact of the relay 10 according to the second embodiment of the present invention, please refer to fig. 2, on the basis of the circuit for suppressing the adhesion of the switch contact of the relay 10 according to the first embodiment, in this embodiment, the circuit further includes a freewheel circuit module 70 connected to the coil 101, and when the freewheel circuit module 70 is turned off in the relay 10, the freewheel circuit module 70 releases the electric energy stored in the coil 101 to protect the relay 10.
Further, referring to fig. 2, the freewheel loop module 70 includes: the coil comprises a first diode 701, a second diode 702 and a third resistor 703, wherein one end of the third resistor 703 is connected with one end of the coil 101, the other end of the third resistor 703 is connected with the other end of the coil 101 through the second diode 702, one end of the first diode 702 is connected with the second diode 702, and the other end of the first diode 701 is connected with the third resistor 703.
Further, the second diode 702 is a light emitting diode for indicating the energy storage state of the coil. The utility model discloses the suppression circuit of relay 10 switch contact adhesion of second embodiment is on the basis of first embodiment, through afterflow return circuit module 70, suppress surge circuit module 40 and absorb two parts of output and input that arc circuit module 50 can protect relay 10 simultaneously, and simultaneously, suppress surge circuit module 40 and absorb arc circuit module 50 and set up the nearest at relay 10, realize that the adhesion phenomenon takes place for the relay 10 switch contact of dual fail-safe suppression, satisfy relay 10 output to load (hindering nature, perception, capacity) fully compatible, reduce the interference that power supply circuit received, increase the reliability of product when using.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A relay switch contact stick suppression circuit, comprising:
the relay is connected with the first power supply module;
the input end is connected with the second power supply module, and the output end is connected with a load;
the surge suppression circuit module is arranged between the relay and the output end and is used for absorbing surge current generated by the contact at the moment of closing the relay;
the arc absorption circuit module is arranged between the input end and the output end, is connected with the relay in parallel and is used for absorbing the arc generated by the contact at the moment of turning off the relay;
and the control module is connected with the relay and is used for controlling the turn-off/suction of the relay.
2. The suppression circuit of claim 1, wherein said absorption arc circuit module comprises a high voltage capacitor.
3. The suppression circuit according to claim 1, wherein said surge suppression circuit module comprises a thermistor.
4. The suppression circuit according to claim 1, wherein the control module comprises a single chip, a transistor, a first resistor and a second resistor, wherein a base of the transistor is connected to the single chip via the first resistor, a collector of the transistor is connected to the relay, an emitter of the transistor and the base are connected across the second resistor, and an emitter of the transistor is grounded.
5. The suppression circuit of claim 1, wherein the load comprises: one or more of resistive, inductive, and capacitive loads.
6. The suppression circuit according to claim 1, wherein the first power supply module is a dc power supply and the second power supply module is an ac power supply.
7. The suppression circuit of claim 1, wherein said relay includes a coil, a first contact and a second contact, said first contact connected to said input terminal, said second contact connected to said output terminal, said coil connected to said control module.
8. The suppression circuit of claim 7 further comprising a freewheel loop module coupled to said coil that releases stored energy from said coil when said relay is turned off.
9. The suppression circuit of claim 8, wherein the freewheel loop module comprises: the coil comprises a first diode, a second diode and a third resistor, wherein one end of the third resistor is connected with one end of the coil, the other end of the third resistor is connected with the other end of the coil through the second diode, one end of the first diode is connected with the second diode, and the other end of the first diode is connected with the third resistor.
10. The suppression circuit of claim 9, wherein the second diode is a light emitting diode for indicating a state of energy stored by the coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921972270.3U CN211238104U (en) | 2019-11-12 | 2019-11-12 | Circuit for inhibiting contact adhesion of relay switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921972270.3U CN211238104U (en) | 2019-11-12 | 2019-11-12 | Circuit for inhibiting contact adhesion of relay switch |
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| Publication Number | Publication Date |
|---|---|
| CN211238104U true CN211238104U (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921972270.3U Active CN211238104U (en) | 2019-11-12 | 2019-11-12 | Circuit for inhibiting contact adhesion of relay switch |
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| CN (1) | CN211238104U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114551156A (en) * | 2022-02-28 | 2022-05-27 | 西安思丹德信息技术有限公司 | Relay contact protection circuit for controlling capacitive load |
-
2019
- 2019-11-12 CN CN201921972270.3U patent/CN211238104U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114551156A (en) * | 2022-02-28 | 2022-05-27 | 西安思丹德信息技术有限公司 | Relay contact protection circuit for controlling capacitive load |
| CN114551156B (en) * | 2022-02-28 | 2023-08-29 | 西安思丹德信息技术有限公司 | Relay contact protection circuit for controlling capacitive load |
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