CN207817458U - A kind of station acquisition circuit applied on automatic change-over - Google Patents
A kind of station acquisition circuit applied on automatic change-over Download PDFInfo
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- CN207817458U CN207817458U CN201721907930.0U CN201721907930U CN207817458U CN 207817458 U CN207817458 U CN 207817458U CN 201721907930 U CN201721907930 U CN 201721907930U CN 207817458 U CN207817458 U CN 207817458U
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- resistance
- optoisolator
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- automatic change
- acquisition circuit
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Abstract
The utility model discloses a kind of station acquisition circuits applied on automatic change-over, including resistance R2, resistance R3, resistance R4, position switch S2, optoisolator U3, capacitance C2, diode D1, MCU control chip U4；This applies the station acquisition circuit on automatic change-over that the switching value of position signal is converted to current signal using optoisolator, it is signal to convert electrical current into voltage again, avoids directly switch being accessed control chip by conducting wire by causing electromagnetic interference to control chip.
Description
Technical field
The utility model is related to Acquisition Circuit technical field, more particularly to a kind of position applied on automatic change-over
Acquisition Circuit.
Background technology
Traditional switch operating position Acquisition Circuit is as shown in Figure 1, be exactly that position switch auxiliary contact S1 is passed through conducting wire
It is directly accessed the pin of control chip；The electromagnetic interference from conducting wire can influence to control acquisition of the chip to other signals in this way,
So as to cause station acquisition accuracy decline, or even the case where will appear controller error in judgement.
Utility model content
The purpose of this utility model is to provide a kind of station acquisition circuit applied on automatic change-over.
For this purpose, technical solutions of the utility model are as follows：
A kind of station acquisition circuit applied on automatic change-over, including resistance R2, resistance R3, resistance R4, position
Switch S2, optoisolator U3, capacitance C2, diode D1, MCU control chip U4；A termination DC power supplier of resistance R2+
5V output voltages, the cathode of another terminating diode D1, the cathode of mono- terminating diode D1 of resistance R3, another termination optoisolator
The anode of light emitting diode in U3；The cathode of light emitting diode connects the anode of diode D1 in optoisolator U3；Position switch S2
One termination DC power supplier the ends GND, the anode of another terminating diode D1；The emitter of triode in optoisolator U3
It is grounded, the collector of triode connects the I/O pins of MCU control chips U4 in optoisolator U3；The VDD of MCU control chips U4 draws
Foot connects+5V voltages, and MCU controls the VSS pins ground connection of chip U4；A termination+5V voltages of resistance R4, the other end pass through capacitance C2
Ground connection.
Further, the resistance value of the resistance R2 and resistance R3 is 2K Ω, and the resistance value of resistance R4 is 10K Ω.
Further, the size of the capacitance C2 is 1000nF.
Compared with prior art, this applies the station acquisition circuit on automatic change-over to use optoisolator by position
The switching value of signal is converted to current signal, then it is signal to convert electrical current into voltage, avoids directly connecing switch by conducting wire
Enter to control chip and electromagnetic interference is caused to control chip, at the same time, using DC power supplier, realizes optoisolator direct current
Input power and controller power supply are effectively isolated；Position of the switch Acquisition Circuit reliability is high, it can be achieved that controller
To switching the precise acquisition of operating position.
Description of the drawings
Fig. 1 is the station acquisition circuit diagram on traditional automatic change-over.
Fig. 2 is the station acquisition circuit diagram provided by the utility model applied on automatic change-over.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment is described further the utility model, but following embodiments are right absolutely not
The utility model has any restrictions.
Embodiment 1：
A kind of station acquisition circuit applied on automatic change-over, as shown in Fig. 2, including resistance R2, resistance R3, electricity
Hinder R4, position switch S2, optoisolator U3, capacitance C2, diode D1, MCU control chip U4；A termination direct current of resistance R2
+ 5V the output voltages of source module, the cathode of another terminating diode D1, the cathode of mono- terminating diode D1 of resistance R3, the other end
Connect the anode of light emitting diode in optoisolator U3；The cathode of light emitting diode connects the anode of diode D1 in optoisolator U3；
The ends GND of a termination DC power supplier of position switch S2, the anode of another terminating diode D1；Three poles in optoisolator U3
The emitter of pipe is grounded, and the collector of triode connects the I/O pins of MCU control chips U4 in optoisolator U3；MCU controls chip
The VDD pins of U4 connect+5V voltages, and MCU controls the VSS pins ground connection of chip U4；A termination+5V voltages of resistance R4, the other end
It is grounded by capacitance C2.
Wherein, the resistance value of the resistance R2 and resistance R3 is 2K Ω, and the resistance value of resistance R4 is 10K Ω.
In addition, the size of the capacitance C2 is 1000nF.
The operation principle of the station acquisition circuit provided by the utility model applied on automatic change-over is as follows：
When switching work, position switch S2 is closed, and position switch S2 both end voltages are 0V, the input terminal 2 of optoisolator U3
Locate voltage for isolated power supply GND_ISO_DI, has electric current, optoisolator U3 brilliant between 1 pin and 2 pins of optoisolator U3
It is connected between 4 pin of body pipe output end and 3 pins, voltage is GND at V1, and when switch disconnects, location assistance contact S2 is disconnected, S2
Both end voltage is VCC_ISO_5V, and optoisolator U3 input terminal no currents, optoisolator U3 transistor outputs are not turned on, at V1
Voltage VCC_5V, optoisolator U3 pass through the variation of voltage at V1, the state of state, that is, operating position of identification position switch S2.
Position switch S2 voltages are isolated with voltage at V1 in change procedure, improve the anti-interference level of controller.
Claims (3)
1. a kind of station acquisition circuit applied on automatic change-over, which is characterized in that including resistance R2, resistance R3, electricity
Hinder R4, position switch S2, optoisolator U3, capacitance C2, diode D1, MCU control chip U4；A termination direct current of resistance R2
+ 5V the output voltages of source module, the cathode of another terminating diode D1, the cathode of mono- terminating diode D1 of resistance R3, the other end
Connect the anode of light emitting diode in optoisolator U3；The cathode of light emitting diode connects the anode of diode D1 in optoisolator U3；
The ends GND of a termination DC power supplier of position switch S2, the anode of another terminating diode D1；Three poles in optoisolator U3
The emitter of pipe is grounded, and the collector of triode connects the I/O pins of MCU control chips U4 in optoisolator U3；MCU controls chip
The VDD pins of U4 connect+5V voltages, and MCU controls the VSS pins ground connection of chip U4；A termination+5V voltages of resistance R4, the other end
It is grounded by capacitance C2.
2. the station acquisition circuit according to claim 1 applied on automatic change-over, which is characterized in that described
The resistance value of resistance R2 and resistance R3 are that the resistance value of 2K Ω, resistance R4 are 10K Ω.
3. the station acquisition circuit according to claim 1 applied on automatic change-over, which is characterized in that described
The size of capacitance C2 is 1000nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721907930.0U CN207817458U (en) | 2017-12-29 | 2017-12-29 | A kind of station acquisition circuit applied on automatic change-over |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721907930.0U CN207817458U (en) | 2017-12-29 | 2017-12-29 | A kind of station acquisition circuit applied on automatic change-over |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207817458U true CN207817458U (en) | 2018-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721907930.0U Active CN207817458U (en) | 2017-12-29 | 2017-12-29 | A kind of station acquisition circuit applied on automatic change-over |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110471481A (en) * | 2019-09-16 | 2019-11-19 | 南京中感微电子有限公司 | A kind of high-precision pressure regulator |
-
2017
- 2017-12-29 CN CN201721907930.0U patent/CN207817458U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110471481A (en) * | 2019-09-16 | 2019-11-19 | 南京中感微电子有限公司 | A kind of high-precision pressure regulator |
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