CN207835034U - A kind of relay contact protection circuit of control inductive load - Google Patents
A kind of relay contact protection circuit of control inductive load Download PDFInfo
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- CN207835034U CN207835034U CN201820315303.6U CN201820315303U CN207835034U CN 207835034 U CN207835034 U CN 207835034U CN 201820315303 U CN201820315303 U CN 201820315303U CN 207835034 U CN207835034 U CN 207835034U
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Abstract
The utility model provides a kind of relay contact protection circuit of control inductive load, and delayed drive module input terminal is connect with the first AC input；Delayed drive module output end is connect with relay RY1 coils；The contacts relay RY1 and startup transient protection wired in parallel；The contacts relay RY1 one end is connect with the second alternating current fire wire；The relay RY1 contact other ends are connect with AC load one end；The AC load other end is connect with the second alternating current zero curve；It includes concatenated thermistor NTC and fuse F1 to start transient protection module；Thermistor NTC and fuse F1 is in contact setting.The relay contact protection circuit of control inductive load provided by the utility model; by delayed drive module, loaded work piece current path and the collective effect for starting transient protection module, the purpose protected to relay in AC load startup moment is realized.
Description
Technical field
The utility model is related to relay protection circuit field, more particularly to a kind of relay contact of control inductive load
Protect circuit.
Background technology
Inductive load is required to the driving ability of driving circuit such as high power industrial frequency transformer (1500W), motor etc.
Normal work.There are following as shown in Figure 1, existing circuit is wiped for the relay drive circuit of generally conventional control inductive load
Defect：Relay contact will be impacted at the time of being attracted by the startup transient high-current of 5-10 times of inductive load, it is this instantaneously
Heavy current impact be easy to cause relay contact and is being attracted the moment because can not externally distribute heat between the high temperature, short time that spark is brought
It measures and causes contact fusion that can not disconnect, when relay contact, which needs to disconnect, but can not normally disconnect, dangerous generation will be caused
Loss even on property；Meanwhile this transient high-current impact also results in shortening for relay contact service life.
Utility model content
To solve the problems, such as to mention in above-mentioned background technology, the utility model provides a kind of relay of control inductive load
Contact protection circuit, including delayed drive module, startup transient protection module and relay；Wherein：
The delayed drive module input terminal is connect with the first AC input；The delayed drive module
Output end is connect with the relay coil；
The relay contact and the startup transient protection wired in parallel；Described relay contact one end is exchanged with second
Electrical fire line connects；The relay contact other end is connect with AC load one end；The AC load other end and second is handed over
Galvanic electricity zero curve connects；
The startup transient protection module includes concatenated thermistor NTC and fuse F1；The thermistor NTC and
Fuse F1 is in contact setting.
Further, the delayed drive module include fusible resistance break R1, resistance R2, resistance R3, diode D1,
Diode D2, diode D3, polar capacitor EC1 and polar capacitor EC2；Wherein：
Described one end fusible resistance break R1 is connect with the first alternating current fire wire；The fusible resistance break R1 other ends and two poles
The one end pipe D1 is connected with the one end diode D3；The diode D1 other ends and the one end the polar capacitor EC1, the one end resistance R2
It is connected with the one end resistance R3；The one end the polar capacitor EC2, the one end diode D2, relay coil one end with the resistance
R2 is connected with the connecting pin of resistance R3；The relay coil other end, the diode D2 other ends, the polar capacitor EC1 other ends,
The polar capacitor EC2 other ends, the diode D3 other ends and the first equal grounding connection of alternating current zero curve.
Further, the thermistor NTC includes thermistor NTC1 and thermistor NTC2.
Further, the model of the thermistor NTC1 and thermistor NTC2 is 33R/5A；The fuse F1
Model 8A/125 degree.
Further, the model 47R/2W of the fusible resistance break R1.
Further, the model of the diode D1, diode D2 and diode D3 are A7.
Further, the model of the polar capacitor EC1 and polar capacitor EC2 is 50/100 μ F.
The relay contact protection circuit of control inductive load provided by the utility model, by relay performance loop
Middle design delayed drive module, loaded work piece current path and the collective effect for starting transient protection module, realization are being handed over
Current load startup moment protects relay.Present utility model application people is devised by experiment utility model many times
Delayed drive module and startup transient protection mould, the contact by thermistor with fuse design；Make simply to start
The delayed drive module that the cooperation of transient protection module is designed for the utility model, reaches and is instantaneously opened in AC load
To the purpose of the protection of relay contact when dynamic；Meanwhile also avoiding dangerous or property caused by being bonded due to relay contact
On loss.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is the relay drive circuit that generally conventional control inductive loads；
Fig. 2 is the circuit diagram of the relay contact protection circuit of control inductive provided by the utility model load.
Reference numeral：
10 delayed drive module, 20 loaded work piece current path 30 starts transient protection module
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts belong to
The range of the utility model protection.
In the description of the present invention, it should be noted that the similar word such as term " connection " or " connected " is not
The connection with physics or machinery is limited, but may include electrical connection, light connects etc., either directly or indirectly
's.
The utility model embodiment provides a kind of relay contact protection circuit of control inductive load, including delayed
Drive module 10 starts transient protection module 30 and relay RY1；Wherein：
10 input terminal of delayed drive module is electrically connected with the first exchange；The delayed drive module 10 is defeated
Outlet is connect with the relay RY1 coils；
The contacts the relay RY1 are in parallel with the startup transient protection module 30；The contacts relay RY1 one end with
Second alternating current fire wire connects；The relay RY1 contact other ends are connect with AC load one end；The AC load is another
End is connect with the second alternating current zero curve；
The startup transient protection module 30 includes concatenated thermistor NTC and fuse F1；The thermistor NTC
It is in contact setting with fuse F1.
When it is implemented, 10 input terminal of delayed drive module is connect with the first AC input；Delayed drives
10 output end of dynamic model block is connect with relay RY1 coils；
The contacts relay RY1 are in parallel with transient protection module 30 is started；The contacts relay RY1 one end exchanges electrical fire with second
Line connects；The relay RY1 contact other ends are connect with AC load one end；The AC load other end and the second alternating current zero curve connect
It connects；
In first alternating current and the second alternating current synchronization input circuit；First AC input and the second alternating current
Input terminal be connected in parallel or use other similar connection types, make entire power on circuitry it is ensured that the first AC input and
Second AC input has electricity simultaneously；As shown in Fig. 2, two ACL link together in figure, while two CAN also connect
Together；Supply voltage is acted on to the coil of relay RY1 by the output end of delayed drive module 10；By powering on
The delay of delay and running module 10 designs so that the supply voltage for exporting the module prolongs compared to the control source of the second alternating current
Slow a few tens of milliseconds；So that the contact pickup time of relay RY1 is after AC load starts the time；It is designed by the delay,
So that the high current that AC load starts moment is born by startup transient protection module 30, and the contact of relay RY1 is then held
The electric current of (20 part of loaded work piece current path as shown in Figure 2) when being worked normally by AC load, to avoid exchange negative
The high current that startup moment generates is carried to damage caused by the contacts relay RY1；
It includes concatenated thermistor NTC and fuse F1 to start transient protection module 30；Thermistor NTC and fuse
F1 is in contact setting；The practical specifications used of thermistor NTC need to adjust according to actual bearing power size.Preferably,
Thermistor NTC1 and thermistor NTC2 uses the thermistor of 33R/5A models, this power-type NTC thermistor to be taken the photograph 25
Resistance under family name's degree room temperature is 33 ohm, and rated current at this temperature is 5A；Preferably, thermistor NTC settings
There are two or it is multiple, such as thermistor NTC1 and thermistor NTC2, this two power type thermal resistance NTC's act as:It is logical
When the immediate current that AC load starts when electric is by thermistor NTC1, fuse F1 and thermistor NTC2, by big electricity
This two power-type NTC thermistor temperature of thermistor NTC1 and thermistor NTC2 steeply rise when the impact of stream, cause
Its resistance drastically declines, to adaptive high current by needs, reduce loop resistance；Thermistor NTC1 and temperature-sensitive electricity
Resistance NTC2 temperature steeply rises the rapid rising for also showing as surface temperature；By by the current mode Thermal Cutoffs in circuit
This two power type thermal resistance threes of F1 and thermistor NTC1 and thermistor NTC2 include but not limited to the processing bundled
Mode contacts setting so that the surface of fuse F1 can be tightly attached to one with the surface of thermistor NTC1 and thermistor NTC2
It rises；The parameter setting premise of thermistor NTC1 and thermistor NTC2 and fuse F1, which has to comply with, normally to be used
In the case of AC load when starting the impact of immediate current, fuse F1 will not be blown because immediate current impacts, and hot
Surface temperature can not make fuse F1 caused by this two power type thermal resistances of quick resistance NTC1 and thermistor NTC2
Disconnection is protected because of the effect of temperature；Preferably, the model 8A/125 degree of fuse F1.
The relay contact protection circuit for the control inductive load that the utility model embodiment provides, by relay work
Make to design delayed drive module, loaded work piece current path and the collective effect for starting transient protection module in circuit, it is real
Present AC load startup moment protects relay.Present utility model application people passes through experiment utility model many times
It devises delayed drive module and starts transient protection mould, the contact by thermistor with fuse designs；Make simple
The delayed drive module that designs for the utility model of startup transient protection module cooperation, reach in AC load
To the purpose for playing protection of relay contact when instantaneous starting.
Preferably, the delayed drive module 10 include fusible resistance break R1, resistance R2, resistance R3, diode D1,
Diode D2, diode D3, polar capacitor EC1 and polar capacitor EC2；Wherein：
Described one end fusible resistance break R1 is connect with the first alternating current fire wire；The fusible resistance break R1 other ends and two poles
The one end pipe D1 is connected with the one end diode D3；The diode D1 other ends and the one end the polar capacitor EC1, the one end resistance R2
It is connected with the one end resistance R3；The one end the polar capacitor EC2, the one end diode D2, relay RY1 coils one end with the electricity
Resistance R2 is connected with the connecting pin of resistance R3；The relay RY1 coils other end, the diode D2 other ends, polar capacitor EC1 are another
One end, the polar capacitor EC2 other ends, the diode D3 other ends and the first equal grounding connection of alternating current zero curve.
When it is implemented, delayed drive module 10 include fusible resistance break R1, resistance R2, resistance R3, diode D1,
Diode D2, diode D3, polar capacitor EC1 and polar capacitor EC2；Wherein：
The one end fusible resistance break R1 is connect with the first alternating current fire wire；The fusible resistance break R1 other ends and diode D1 anodes
It is connected with diode D3 cathodes；Diode D1 cathodes are connect with polar capacitor EC1 anodes, the one end resistance R2 and the one end resistance R3；
Polar capacitor EC2 anodes, diode D2 cathodes, relay RY1 coils one end are connect with the connecting pin of resistance R2 and resistance R3；
The relay RY1 coils other end, diode D2 anodes, polar capacitor EC1 cathodes, polar capacitor EC2 cathodes, diode D3 anodes
And the first equal grounding connection of alternating current zero curve.
The wire resistor of fusible resistance break R1 is used for the current-limiting protection when being struck by lightning simulation test and uses, diode D2 and two poles
Pipe D3 is halfwave rectifier device, and ACL is just and ACN effective, polar capacitor EC1 and polar capacitor EC2 when being negative alternation
Obtain half-wave charging, resistance R2 and resistance R3 are dropping resistor, for adjusting the voltage on polar capacitor EC2, and driving after
Voltage on electric appliance RY1；Back-emf continued flow tubes of the diode D2 as relay RY1 coils, for preventing excessively high back-emf
More than the normal pressure voltage of polar capacitor EC1 and polar capacitor EC2；The first alternating current and the second alternating current of this partial circuit be
The same moment input, the out-put supply of delayed drive module 10 acts on the coil of relay RY1, and delayed drives
Dynamic model block 10 it is electric after due to circuit summarize the devices such as capacitance and resistance charging and transmission delay effect, reaching makes relay
Device RY1 coil motions voltage delays tens milliseconds than the control source of the second alternating current, to realize that protective relay RY1 is touched
The purpose of point.Polar capacitor EC1 and polar capacitor EC2 is electrolytic capacitor.
Preferably, the model 47R/2W of the fusible resistance break R1.
Preferably, the model of the diode D1, diode D2 and diode D3 are A7.
Preferably, the model of the polar capacitor EC1 and polar capacitor EC2 is 50/100 μ F.
Although more herein used the terms such as resistance, diode, capacitance, relay, fuse, not
It rules out the possibility of using other terms.The use of these items is only for more easily describe and explain the utility model
Essence；It is contrary to the spirit of the present invention to interpret them as any one of the additional limitations.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it
System；Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should
Understand：It still can be with technical scheme described in the above embodiments is modified, either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new
The range of each embodiment technical solution of type.
Claims (7)
1. a kind of relay contact protection circuit of control inductive load, it is characterised in that：Including delayed drive module
(10), start transient protection module (30) and relay RY1；Wherein：
Delayed drive module (10) input terminal is connect with the first AC input；The delayed drive module
(10) output end is connect with the relay RY1 coils；
The contacts the relay RY1 are in parallel with startup transient protection module (30)；The contacts relay RY1 one end and the
Two alternating current fire wires connect；The relay RY1 contact other ends are connect with AC load one end；The AC load other end
It is connect with the second alternating current zero curve；
The startup transient protection module (30) includes concatenated thermistor NTC and fuse F1；The thermistor NTC and
Fuse F1 is in contact setting.
2. the relay contact protection circuit of control inductive load according to claim 1, it is characterised in that：It is described to power on
Delay and running module (10) includes fusible resistance break R1, resistance R2, resistance R3, diode D1, diode D2, diode D3, pole
Property capacitance EC1 and polar capacitor EC2；Wherein：
Described one end fusible resistance break R1 is connect with the first alternating current fire wire；The fusible resistance break R1 other ends and diode D1
One end is connected with the one end diode D3；The diode D1 other ends and the one end the polar capacitor EC1, the one end resistance R2 and electricity
Hinder the connection of the one end R3；The one end the polar capacitor EC2, the one end diode D2, relay RY1 coils one end with the resistance R2
It is connected with the connecting pin of resistance R3；The relay RY1 coils other end, the diode D2 other ends, polar capacitor EC1 are another
End, the polar capacitor EC2 other ends, the diode D3 other ends and the first equal grounding connection of alternating current zero curve.
3. the relay contact protection circuit of control inductive load according to claim 1, it is characterised in that：The temperature-sensitive
Resistance NTC includes thermistor NTC1 and thermistor NTC2.
4. the relay contact protection circuit of control inductive load according to claim 3, it is characterised in that：The temperature-sensitive
The model of resistance NTC1 and thermistor NTC2 are 33R/5A；The model 8A/125 degree of the fuse F1.
5. the relay contact protection circuit of control inductive load according to claim 2, it is characterised in that：It is described fusible
The model 47R/2W of resistance break R1.
6. the relay contact protection circuit of control inductive load according to claim 2, it is characterised in that：Two pole
The model of pipe D1, diode D2 and diode D3 are A7.
7. the relay contact protection circuit of control inductive load according to claim 2, it is characterised in that：The polarity
The model of capacitance EC1 and polar capacitor EC2 are 50/100 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820315303.6U CN207835034U (en) | 2018-03-08 | 2018-03-08 | A kind of relay contact protection circuit of control inductive load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820315303.6U CN207835034U (en) | 2018-03-08 | 2018-03-08 | A kind of relay contact protection circuit of control inductive load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207835034U true CN207835034U (en) | 2018-09-07 |
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ID=63398587
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820315303.6U Active CN207835034U (en) | 2018-03-08 | 2018-03-08 | A kind of relay contact protection circuit of control inductive load |
Country Status (1)
| Country | Link |
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| CN (1) | CN207835034U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
-
2018
- 2018-03-08 CN CN201820315303.6U patent/CN207835034U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
| CN108242794B (en) * | 2018-03-08 | 2023-05-23 | 厦门芯阳科技股份有限公司 | Relay contact protection circuit for controlling inductive load |
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