CN202058003U - Output port circuit for PLC (programmable logic controller) transistor - Google Patents
Output port circuit for PLC (programmable logic controller) transistor Download PDFInfo
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- CN202058003U CN202058003U CN2011202569269U CN201120256926U CN202058003U CN 202058003 U CN202058003 U CN 202058003U CN 2011202569269 U CN2011202569269 U CN 2011202569269U CN 201120256926 U CN201120256926 U CN 201120256926U CN 202058003 U CN202058003 U CN 202058003U
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- triode
- output terminal
- port circuit
- transistor
- pliotron
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Abstract
The utility model discloses an output port circuit for a PLC transistor, comprising a first output terminal of the port circuit, a second output terminal of the port circuit, a photoelectric coupler, a driving triode and a power triode, wherein the driving triode and the power triode form a Darlington transistor; a collector of the Darlington transistor is connected with the first output terminal; an emitter of the Darlington transistor is connected with the second output terminal; and a base of the Darlington transistor is connected with the photoelectric coupler. In the utility model, the driving triode and the power triode form the Darlington structure, thus greatly increasing the loading capability of the power triode. When large surge interference occurs to a loading circuit, as a stage of driver is additionally arranged before the power triode of the port circuit, large current can flow by the power triode instantaneously, thus protecting the port circuit from damage.
Description
[technical field]
The utility model relates to programmable logic controller (PLC), relates in particular to a kind of PLC transistor output port circuit.
[background technology]
As shown in Figure 1, traditional PLC transistor output port employing CPU control, photoelectric coupler isolation, pliotron exported, the form of port stabilivolt protection.Adopt photoelectrical coupler to export direct driving power triode, can make that the conveyance capacity of PLC port is too little because photoelectrical coupler secondary current driving force is not enough, when at port driver relay, contactor, when perhaps load circuit has big surge to disturb, cause excessive electric current to flow through triode, cause triode half to puncture port circuit was lost efficacy.
[summary of the invention]
The technical problems to be solved in the utility model provides a kind of PLC transistor output port circuit of unlikely inefficacy when load circuit has big surge to disturb.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of PLC transistor output port circuit, comprise first output terminal of port circuit and second output terminal, photoelectrical coupler, driving triode and the pliotron of port circuit, described driving triode and pliotron are formed Darlington transistor, the collector of described Darlington transistor connects described first output terminal, the emitter of Darlington transistor connects described second output terminal, and the base stage of Darlington transistor connects described photoelectrical coupler.
Above-described PLC transistor output port circuit comprises first resistance and second resistance, and described driving triode is the PNP triode, and described pliotron is the NPN triode; The base stage that drives triode connects the collector of photoelectrical coupler phototriode, and the collector that drives triode connects described second output terminal by first resistance, and the emitter that drives triode connects the collector of photoelectrical coupler phototriode by second resistance; The base stage of pliotron connects the collector that drives triode, and the emitter of the collector of pliotron and driving triode connects described first output terminal; The emitter of the emitter of pliotron and photoelectrical coupler phototriode connects described second output terminal.
Above-described PLC transistor output port circuit comprises stabilivolt, and described stabilivolt is connected between described first output terminal and second output terminal.
Above-described PLC transistor output port circuit comprises capacitor, and described capacitor is connected between described first output terminal and second output terminal.
The driving triode of the utility model PLC transistor output port circuit and pliotron are formed darlington structure, can increase the load capacity of pliotron greatly.When bigger surge interference appears in load circuit,, make pliotron transient state flow through bigger electric current, thereby can protect the unlikely damage of port circuit because the pliotron front of port circuit has increased the one-level driving.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the schematic diagram of prior art PLC transistor output port circuit.
Fig. 2 is the schematic diagram of the utility model embodiment PLC transistor output port circuit.
[embodiment]
In the embodiment of the utility model PLC transistor output port circuit shown in Figure 1, Yout end and COM1 end are respectively the output control terminal mouth; Drive triode Q2 and pliotron Q1 and form Darlington transistor, the collector of Darlington transistor connects the Yout terminal, and the emitter of Darlington transistor connects the COM1 terminal, and the base stage of Darlington transistor meets photoelectrical coupler ISO1.
Driving triode Q2 is the PNP triode, and pliotron Q1 is the NPN triode.The base stage that drives triode Q2 connects the collector of photoelectrical coupler ISO1 phototriode, the collector that drives triode Q2 connects the COM1 terminal by first resistance R 4, and the emitter that drives triode Q2 connects the collector of photoelectrical coupler ISO1 phototriode by second resistance R 3.The base stage of pliotron Q1 connects the collector that drives triode Q2, and the emitter of the collector of pliotron Q1 and driving triode Q2 connects the Yout terminal.The emitter of the emitter of pliotron Q1 and photoelectrical coupler ISO1 phototriode connects the COM1 terminal.
During the work of present embodiment PLC transistor output port circuit, CPU control photoelectrical coupler ISO1 conducting, photoelectrical coupler output drives PNP triode Q2 again, carry out one-level earlier and increase driving, the Ic of Q2 removes driving power triode Q1 again, guaranteed output triode Q1 has enough base drive current Ib, thereby can drive bigger Ic electric current.
Present embodiment drives triode and pliotron is formed darlington structure, can increase the load capacity of pliotron greatly.When the user uses the design's port driver load (as auxiliary reclay etc.); bigger surge occurring as load circuit disturbs; because the pliotron Q1 of port has increased the one-level driving; make pliotron Q1 transient state to flow through bigger electric current, thus can the unlikely damage of holding circuit.
Claims (4)
1. PLC transistor output port circuit, it is characterized in that, comprise first output terminal of port circuit and second output terminal, photoelectrical coupler, driving triode and the pliotron of port circuit, described driving triode and pliotron are formed Darlington transistor, the collector of described Darlington transistor connects described first output terminal, the emitter of Darlington transistor connects described second output terminal, and the base stage of Darlington transistor connects described photoelectrical coupler.
2. PLC transistor output port circuit according to claim 1 is characterized in that, comprises first resistance and second resistance, and described driving triode is the PNP triode, and described pliotron is the NPN triode; The base stage that drives triode connects the collector of photoelectrical coupler phototriode, and the collector that drives triode connects described second output terminal by first resistance, and the emitter that drives triode connects the collector of photoelectrical coupler phototriode by second resistance; The base stage of pliotron connects the collector that drives triode, and the emitter of the collector of pliotron and driving triode connects described first output terminal; The emitter of the emitter of pliotron and photoelectrical coupler phototriode connects described second output terminal.
3. PLC transistor output port circuit according to claim 1 is characterized in that, comprises stabilivolt, and described stabilivolt is connected between described first output terminal and second output terminal.
4. PLC transistor output port circuit according to claim 1 is characterized in that, comprises capacitor, and described capacitor is connected between described first output terminal and second output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202569269U CN202058003U (en) | 2011-07-20 | 2011-07-20 | Output port circuit for PLC (programmable logic controller) transistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202569269U CN202058003U (en) | 2011-07-20 | 2011-07-20 | Output port circuit for PLC (programmable logic controller) transistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202058003U true CN202058003U (en) | 2011-11-30 |
Family
ID=45017973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202569269U Expired - Fee Related CN202058003U (en) | 2011-07-20 | 2011-07-20 | Output port circuit for PLC (programmable logic controller) transistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202058003U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204427A (en) * | 2015-10-21 | 2015-12-30 | 浙江禾川科技股份有限公司 | PLC and PLC triode output protection circuit |
| CN109713657A (en) * | 2019-01-28 | 2019-05-03 | 上海海得控制系统股份有限公司 | A kind of protection circuit based on PLC transistor output module |
-
2011
- 2011-07-20 CN CN2011202569269U patent/CN202058003U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204427A (en) * | 2015-10-21 | 2015-12-30 | 浙江禾川科技股份有限公司 | PLC and PLC triode output protection circuit |
| CN109713657A (en) * | 2019-01-28 | 2019-05-03 | 上海海得控制系统股份有限公司 | A kind of protection circuit based on PLC transistor output module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20111130 Termination date: 20200720 |