CN208888322U - A kind of poor contact protection control circuit - Google Patents
A kind of poor contact protection control circuit Download PDFInfo
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- CN208888322U CN208888322U CN201821331982.2U CN201821331982U CN208888322U CN 208888322 U CN208888322 U CN 208888322U CN 201821331982 U CN201821331982 U CN 201821331982U CN 208888322 U CN208888322 U CN 208888322U
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Abstract
The utility model discloses a kind of poor contacts to protect control circuit, including voltage-current sensor, optocoupler, first connecting line and the second connecting line, the voltage-current sensor first input end and the second input termination exchange input, first output end of voltage-current sensor and second output terminal are respectively connected to the photophore input terminal and photophore output end of the optocoupler, the voltage-current sensor second output terminal ground connection, the light-receiving device of the optocoupler is for exporting electric signal, one end of first connecting line is connected to the photophore input terminal, the other end of first connecting line is connected to the first test side of component, one end of second connecting line is connected to the photophore output end, the other end of second connecting line is connected to the second test side of component.The utility model structure is simple, detection sensitivity is high, whether good can be used for detecting electrical contact.
Description
Technical field
The utility model relates to detection circuit fields, protect control circuit more particularly, to a kind of poor contact.
Background technique
In daily production and living, this failure of poor contact often occurs on electrical equipment or circuit, electrically sets
Electric current is caused to be obstructed for interior electrical contact is bad, to make circuit cisco unity malfunction；Electrical equipment can be made with ground poor contact
Even cause the serious consequence of fire at damage electrical equipment, therefore element in detection circuit and electrical equipment or outside connect
Whether ground is well even more important, and then needs a kind of for detecting the circuit of poor contact.
Utility model content
The utility model provides a kind of poor contact protection control circuit, for solving the above problems.
Realize technical characteristic used in the utility model are as follows:
A kind of poor contact protection control circuit, it is characterised in that: including voltage-current sensor, optocoupler, the first connection
Line and the second connecting line, the voltage-current sensor first input end and the second input termination exchange input, the voltage electricity
The first output end of flow sensor and second output terminal are respectively connected to the photophore input terminal and photophore output end of the optocoupler,
Voltage-current sensor second output terminal ground connection, the light-receiving device is for exporting electric signal, and the one of first connecting line
End is connected to the photophore input terminal, and the other end of first connecting line is connected to the first test side of component, and described the
One end of two connecting lines is connected to the photophore output end, and the other end of second connecting line is connected to the of the component
Two test sides；The voltage-current sensor is used to exchange input being converted to direct current output；First test side and
Second test side is the electrical both ends for needing to carry out poor contact detection on the component；The optocoupler is used to indicate described
One test side and the second test side poor contact detecting state are simultaneously terminated in first test side and second detection
Electric signal is exported when touching bad.
It further, further include input protection resistor, the first input end and/or second input terminal are through described defeated
Enter protective resistance and is followed by exchange input.
It further, further include output protection resistance, the photophore input terminal and/or the photophore output end are through institute
First output end and/or the second output terminal are connected to after stating output protection resistance.
It further, further include capacitor, the capacitor both ends are separately connected first output end and second output
On end.
It further, further include first diode, the second diode, third diode and the 4th diode, described first
On circuit between first output end and the photophore input terminal, second Diode series exist Diode series
On circuit between the second output terminal and grounding point, the anode of the first diode is electrically connected with first output end
It connects, the cathode of the first diode is electrically connected with the photophore input terminal, the anode of second diode and described the
The electrical connection of two output ends, the minus earth of second diode, the anode of the third diode and the 4th diode
Anode electrical connection, the cathode of the third diode is connected to first output end, and the cathode of the 4th diode connects
It is connected to the second output terminal.
Preferably, the photophore of the optocoupler uses light emitting diode, and the anode of the light emitting diode is connected to described
First output end, the cathode of the light emitting diode are connected to the second output terminal.
Preferably, the AC-input voltage size is 5V, size of current 2mA.
The utility model has the advantages that
The utility model is realized a kind of electrical for detecting by the combination of voltage-current sensor, optocoupler and connecting line
Contact whether good circuit, structure is simple；Exchange input is coupled with optocoupler detection circuit by voltage-current sensor, is pacified
Good perfection；Detection signal is exported by optocoupler, detection sensitivity is high.
Detailed description of the invention
With reference to the accompanying drawing and specific embodiment the utility model is described in further detail, in which:
Fig. 1 is the utility model circuit structure schematic diagram.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to the design of the utility model, specific structure and generation
It clearly and completely describes, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
Art personnel other embodiments obtained without creative efforts belong to the model of the utility model protection
It encloses.
As shown in Figure 1, control circuit, including the connection of voltage-current sensor 1, optocoupler 2, first are protected in a kind of poor contact
Line 31 and the second connecting line 32；
It further include input protection resistor, output protection resistance 23, capacitor 6 and diode.The input protection resistor includes
First input protection resistor 111, the second input protection resistor 121；The diode includes first diode 51, the second diode
52, third diode 53 and the 4th diode 54.
Component 4 can be an electrical equipment or circuit, and the component 4 includes the first test side 41 and the second test side
42, and current embodiment require that is detected is the route or circuit between first test side 41 and second test side 42
It whether good contacts.
The voltage-current sensor 1 includes two input terminals and two output ends: first input end 11 and the second input
End 12, the first output end 13 and second output terminal 14, the first input end 11 pass through an input with second input terminal 12
Coil connection, first output end 13 are connected with the second output terminal 14 by an induction coil, and the voltage and current passes
The input terminal of sensor 1 is isolated with output end, and the voltage-current sensor 1 is for being isolated power supply；
The optocoupler 2 includes LED light emitter 21, light-receiving device 22, and the anode and the photophore of the photophore 21 input
211 electrical connection of end, the cathode of the photophore 21 are electrically connected with the photophore output end 212, and the two of the light-receiving device 22 are defeated
Outlet for exporting electric signal, the optocoupler 2 for realizing " electricity-light-electricity " signal conversion: when the photophore input terminal
211 and photophore output end 212 when having certain electric current to pass through, the photophore 21 shines, and the light-receiving device 22 is photosensitive and leads to
The output end for crossing the light-receiving device 22 exports the electric signal.
The first input end 11 is followed by exchanging input with first input protection resistor 111 series connection, and described second is defeated
Enter end 12 to be followed by exchanging input with second input protection resistor 121 series connection；First output end 13 and the described 1st
The anode of pole pipe 51 is electrically connected, and the cathode of the first diode 51 is connected to described after connecting with the output protection resistance 23
On the photophore input terminal 211 of optocoupler 2；The second output terminal 14 is electrically connected with the anode of second diode 52, described
The minus earth of second diode 52, the cathode of second diode 52 are also electrically connected with the photophore output end 212；Institute
The cathode for stating third diode 53 is electrically connected with first output end 13, the anode of the third diode 53 and the described 4th
The anode of diode 51 is electrically connected, and the cathode of the 4th diode 54 is electrically connected with the second output terminal 14, and described first
The effect of diode 51, the second diode 52, third diode 53 and the 4th diode 54 is limitation first output end 13
The current direction of the circuit connected with the second output terminal 14, protects component, and the output protection resistance 23 can also be with
Selection is connected between the photophore output end 212 and grounding point, achievees the purpose that the protection optocoupler 2, and the input is protected
Protecting resistance can also be only with some in first input protection resistor 111 or second input protection resistor 121；
One end of the capacitor 6 is electrically connected with the cathode of the first diode 51, the other end of the capacitor 6 with it is described
The cathode of second diode 52 is electrically connected, therefore one end that the capacitor 6 is electrically connected with 51 cathode of first diode is in
Before the photophore input terminal 211, one end that the capacitor 6 is electrically connected with 52 cathode of the second diode is ground connection,
And the capacitor 6 is " logical exchange hinders direct current ", therefore it is to eliminate 13 He of the first output end that the capacitor 6, which is arranged,
AC signal that may be present is interfered caused by optocoupler 2 between the second output terminal 14；
One end of first connecting line 31 is electrically connected with the first test side 41 of the component 4, first connecting line
31 other end is electrically connected with the cathode of the first diode 51；One end of second connecting line 32 and the component 4
The electrical connection of second test side 42, the other end of second connecting line 32 are electrically connected with the cathode of second diode 52.
The present embodiment working principle is as follows: exchange is inputted from 12 input voltage of the first input end 11 and the second input terminal
A DC voltage is generated in first output end 13 and the 4th output end 14 after current sensor 1, when first test side
41 and second test side 42 when contacting good, first connecting line 31 is connected with second connecting line 32, is equivalent to
First output end 13 is grounded, and the photophore 21, which is short-circuited, not to shine, and the light-receiving device 22 will not export the electricity at this time
Signal, i.e., the described optocoupler 2 do not work；When first test side 41 and 42 poor contact of the second test side, described
One connecting line 31 and second connecting line 32 are to disconnect, and the conducting of photophore 21 shines, after the light-receiving device 22 is photosensitive
Export the electric signal.
Before use can the first connecting line 31 and second connecting line 32 described in first self-test it is whether good: described first connects
When wiring 31 is not connected with second connecting line 32, optocoupler 2 exports the electric signal；First connecting line 31 and described
When two connecting lines 32 are connected, illustrate first connecting line 31 and described second if optocoupler 2 does not export the electric signal at this time
Connecting line 32 connects well, illustrates that first connecting line 31 and described second connects if optocoupler 2 still exports electric signal at this time
32 poor contact of wiring.
Whether the present embodiment can be applied not only to detect 4 interior contact of component good, and can be used for earthing detection,
First connecting line 31 and second connecting line 32 are commonly connected on circuit or the grounding point of equipment, i.e., described
One connecting line 31 and second connecting line 32 serve as ground line, when first connecting line 31 and second connecting line 32 connect
When ground is bad, the photophore 21 of optocoupler 2 shines, and the light-receiving device 22 is photosensitive and exports the electric signal.
The both ends of the light-receiving device 22 can connect a warning circuit, and the warning circuit includes an alarm, the electricity
Signal is for controlling the warning circuit；The both ends of the light-receiving device 22 can also connect a control circuit, the control circuit
The working power that can be used for controlling the component 4, when first test side 41 and 42 poor contact of the second test side
It cuts off the power in time.
It is the preferred embodiment of the utility model it should be noted that described above, the utility model not office
It is limited to above embodiment, as long as its technical effect for reaching the utility model with identical means, it is practical new all should belong to this
The protection scope of type.
Claims (7)
1. control circuit is protected in a kind of poor contact, it is characterised in that: including voltage-current sensor (1), optocoupler (2), first
Connecting line (31) and the second connecting line (32), voltage-current sensor (1) first input end (11) and the second input terminal
(12) exchange input is connect, (1) first output end (13) of voltage-current sensor and second output terminal (14) are respectively connected to
The photophore input terminal (211) and photophore output end (212) of the optocoupler (2), the voltage-current sensor (1) second are defeated
Outlet (14) ground connection, the light-receiving device (22) of the optocoupler (2) connect for exporting electric signal, one end of first connecting line (31)
It is connected to the photophore input terminal (211), the other end of first connecting line (31) is connected to the first test side of component (4)
(41), one end of second connecting line (32) is connected to the photophore output end (212), second connecting line (32)
The other end is connected to the second test side (42) of the component (4)；
The voltage-current sensor (1) is used to exchange input being converted to direct current output；First test side (41)
It is the electrical both ends for needing to carry out poor contact detection on the component (4) with second test side (42)；The optocoupler (2) is used
In instruction first test side (41) and second test side (42) poor contact detecting state and in first detection
Electric signal is exported when holding (41) and second test side (42) poor contact.
2. control circuit is protected in a kind of poor contact as described in claim 1, it is characterised in that: further include input protection electricity
Resistance, the first input end (11) and/or second input terminal (12) are followed by exchange input through the input protection resistor.
3. control circuit is protected in a kind of poor contact as described in claim 1, it is characterised in that: further include output protection electricity
Resistance, the photophore input terminal (211) and/or the photophore output end (212) are connected to after the output protection resistance
First output end (13) and/or the second output terminal (14).
4. control circuit is protected in a kind of poor contact as described in claim 1, it is characterised in that: it further include capacitor (6), it is described
Capacitor (6) both ends are separately connected on first output end (13) and the second output terminal (14).
5. control circuit is protected in a kind of poor contact as described in claim 1, it is characterised in that: further include first diode
(51), the second diode (52), third diode (53) and the 4th diode (54), the first diode (51) are connected on institute
It states on the circuit between the first output end (13) and the photophore input terminal (211), second diode (52) is connected on
On circuit between the second output terminal (14) and grounding point, the anode of the first diode (51) and first output
(13) electrical connection is held, the cathode of the first diode (51) is electrically connected with the photophore input terminal (211), and the described 2nd 2
The anode of pole pipe (52) is electrically connected with the second output terminal (14), the minus earth of second diode (52), and described
The anode of three diodes (53) is electrically connected with the anode of the 4th diode (54), and the cathode of the third diode (53) connects
It is connected to first output end (13), the cathode of the 4th diode (54) is connected to the second output terminal (14).
6. control circuit is protected in a kind of poor contact as described in claim 1, it is characterised in that: the optocoupler (2) shines
Device (21) uses light emitting diode, and the anode of the light emitting diode is connected to first output end (13), described to shine two
The cathode of pole pipe is connected to the second output terminal (14).
7. control circuit is protected in a kind of poor contact as described in claim 1, it is characterised in that: the AC-input voltage is big
Small is 5V, size of current 2mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821331982.2U CN208888322U (en) | 2018-08-17 | 2018-08-17 | A kind of poor contact protection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821331982.2U CN208888322U (en) | 2018-08-17 | 2018-08-17 | A kind of poor contact protection control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208888322U true CN208888322U (en) | 2019-05-21 |
Family
ID=66509149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821331982.2U Active CN208888322U (en) | 2018-08-17 | 2018-08-17 | A kind of poor contact protection control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208888322U (en) |
-
2018
- 2018-08-17 CN CN201821331982.2U patent/CN208888322U/en active Active
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