CN206421258U - A kind of PLC transistor output mouthful isolation circuits built with triode - Google Patents
A kind of PLC transistor output mouthful isolation circuits built with triode Download PDFInfo
- Publication number
- CN206421258U CN206421258U CN201720034175.3U CN201720034175U CN206421258U CN 206421258 U CN206421258 U CN 206421258U CN 201720034175 U CN201720034175 U CN 201720034175U CN 206421258 U CN206421258 U CN 206421258U
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- triode
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Abstract
A kind of PLC transistor output mouthful isolation circuits built with triode, it includes PLC transistor outputs and common port, the isolation circuit built with PNP triode, the output circuit built with NPN triode and the load circuit being connected with output circuit, and described PLC transistor outputs and common port is connected with the isolation circuit input built with the PNP triode；The input that the NPN triode builds output circuit is connected with the isolation circuit output end that PNP triode is built；The output end that described load circuit builds output circuit with NPN triode is connected；The features such as it has simple in construction, with low cost, and stable.
Description
Technical field
The utility model relates to a kind of PLC transistor output mouthful isolation circuits built with triode, belong to PLC
Technical field.
Background technology
In the prior art, PLC transistor outputs mouthful because load circuit electric current it is excessive, PLC transistors can be caused to export
Port punctures, and port circuit is failed.
The content of the invention
The purpose of this utility model is to overcome the shortcomings of that prior art is present, and provides a kind of simple in construction, and cost is low
It is honest and clean, and the stable PLC transistor output mouthful isolation circuits built with triode.
The purpose of this utility model is completed by following technical solution, a kind of PLC crystal built with triode
Pipe output port isolation circuit, it include PLC transistor outputs and common port, built with PNP triode isolation circuit,
The output circuit built with NPN triode and the load circuit being connected with output circuit, described PLC transistor outputs
It is connected with common port with the isolation circuit input built with the PNP triode；The NPN triode builds output circuit
Input be connected with the isolation circuit output end that PNP triode is built；Described load circuit builds defeated with NPN triode
The output end for going out circuit is connected；The electric signal that described PLC transistor output oral instructions go out, by what is built with PNP triode
Isolation circuit, the triode output control signal in output circuit is built by using NPN triode, controls load circuit.
As preferred：The isolation circuit built with PNP includes：Power module, LED, first resistor, the second electricity
Resistance, 3rd resistor, PNP triode；The PLC transistor outputs mouthful are connected with the negative terminal of the LED, the power module
- V ends and the PLC transistors export common port, one end of the 3rd resistor is connected；One end of the first resistor
+ V the ends of one end, power module with the second resistance are connected；The b1 pin of the PNP triode and LED anode, first
The other end of resistance, the other end of second resistance are connected；The c1 pin of the PNP triode are connected with another pin of 3rd resistor
Connect；The e1 pin of the PNP triode are connected with another pin of second resistance
As preferred：The output circuit built with NPN triode includes：NPN triode, voltage-stabiliser tube VD, the NPN
The b2 pin of triode are connected with the PNP triode c1 pin in the isolation circuit built with PNP；The NPN triode
C2 pin are connected with the negative terminal of voltage-stabiliser tube is followed by one end of load circuit, and the e2 pin of the NPN triode are with voltage-stabiliser tube VD's
Anode, power module-V port is connected and is followed by the other end of load circuit.
The features such as the utility model has simple in construction, with low cost, and stable.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in detail below in conjunction with accompanying drawing：Shown in Fig. 1, a kind of use described in the utility model
The PLC transistor outputs mouthful isolation circuit that triode is built, it includes PLC transistor outputs and common port, with PNP tri-
Isolation circuit, the output circuit built with NPN triode and the load circuit being connected with output circuit that pole pipe is built, institute
The PLC transistor outputs and common port stated are connected with the isolation circuit input built with the PNP triode；Described
The input that NPN triode builds output circuit is connected with the isolation circuit output end that PNP triode is built；Described load
The output end that loop builds output circuit with NPN triode is connected；The electric signal that described PLC transistor output oral instructions go out,
By the isolation circuit built with PNP triode, the triode output control in the output circuit built by using NPN triode
Signal, controls load circuit.
Shown in figure, the isolation circuit built with PNP includes：Power module, LED, first resistor R1, second
Resistance R2,3rd resistor R3, PNP triode；Described PLC transistor outputs mouthful are connected with the negative terminal of the LED, described
- V the ends of power module export common port with the PLC transistors, one end of the 3rd resistor R3 is connected；Described first
Resistance R1 one end is connected with one end of the second resistance the R2 ,+V ends of power module；The b1 pin of the PNP triode with
LED anode, the first resistor R1 other end, the second resistance R2 other end is connected；The 1c pin of the PNP triode and
Three resistance R3 another pin is connected；The e1 pin of the PNP triode are connected with second resistance R2 another pin.
The output circuit described in the utility model built with NPN triode includes：NPN triode, voltage-stabiliser tube VD, it is described
The b2 pin of NPN triode are connected with the PNP triode c1 pin in the isolation circuit built with PNP；The NPN triode
C2 pin be connected with voltage-stabiliser tube VD negative terminal and be followed by one end of load circuit, the e2 pin and voltage-stabiliser tube of the NPN triode
VD the anode ,-V ends of power module are connected and are followed by the other end of load circuit.
A kind of PLC transistor output mouthful isolation circuits built with triode described in the utility model, when PLC is brilliant
When body pipe output port produces a low level signal, the signal is sent to the input of the isolation circuit built with PNP, control
The b1 pin of PNP triode, make the c1 pin of PNP triode export high level, so as to control the b2 pin of NPN triode, make the poles of NPN tri-
The e2 pin of pipe and c2 pin saturation conductions, control load circuit.
Due to the electric signal that PLC transistor output oral instructions go out, by the isolation circuit built with PNP triode, pass through
Output control signal between triode e2 pin and c2 pin in the output circuit built with NPN triode, controls load circuit, from
And PLC transistor outputs mouthful is had letter with existing electric isolating between the output of the output circuit built with NPN triode
Number transmission.When there is over-current phenomenon avoidance in load circuit, damage be NPN triode in output circuit and load circuit electricity
Device element, will not damage PLC transistor outputs mouthful, so as to play buffer action.
Claims (3)
1. a kind of PLC transistor output mouthful isolation circuits built with triode, it includes PLC transistor outputs and public affairs
Common end, the isolation circuit built with PNP triode, the output circuit built with NPN triode and it is connected with output circuit
Load circuit, it is characterised in that described PLC transistor outputs and common port with built with the PNP triode isolate electricity
Road input is connected；The output circuit input that the NPN triode is built with PNP triode is built isolates road output end
It is connected；The output end for the output circuit that described load circuit is built with NPN triode is connected.
2. the PLC transistor output mouthful isolation circuits according to claim 1 built with triode, it is characterised in that
The isolation circuit built with PNP triode includes：Power module, LED, first resistor, second resistance, 3rd resistor,
PNP triode；The PLC transistor outputs mouthful are connected with the negative terminal of the LED, the power module-V port and
The PLC transistors output common port, one end of the 3rd resistor are connected；One end of the first resistor and described second
One end of resistance, power module+V port is connected；The b1 pin of the PNP triode and LED anode, first resistor it is another
One end, the second resistance R other end are connected；The c1 pin of the PNP triode are connected with another pin of 3rd resistor；It is described
The e1 pin of PNP triode are connected with another pin of second resistance.
3. the PLC transistor output mouthful isolation circuits according to claim 1 built with triode, it is characterised in that
The output circuit built with NPN triode includes：NPN triode, voltage-stabiliser tube VD, the b2 pin of the NPN triode and institute
The PNP triode c1 pin stated in the isolation circuit built with PNP are connected；The c2 pin of the NPN triode and bearing for voltage-stabiliser tube
End is connected and is followed by one end of load circuit, the e2 pin of the NPN triode and voltage-stabiliser tube VD anode, power module-
V port, which is connected, is followed by the other end of load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720034175.3U CN206421258U (en) | 2017-01-12 | 2017-01-12 | A kind of PLC transistor output mouthful isolation circuits built with triode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720034175.3U CN206421258U (en) | 2017-01-12 | 2017-01-12 | A kind of PLC transistor output mouthful isolation circuits built with triode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206421258U true CN206421258U (en) | 2017-08-18 |
Family
ID=59571108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720034175.3U Expired - Fee Related CN206421258U (en) | 2017-01-12 | 2017-01-12 | A kind of PLC transistor output mouthful isolation circuits built with triode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206421258U (en) |
-
2017
- 2017-01-12 CN CN201720034175.3U patent/CN206421258U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170818 Termination date: 20190112 |