CN214125266U - Indicator lamp interface circuit - Google Patents
Indicator lamp interface circuit Download PDFInfo
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- CN214125266U CN214125266U CN202022371629.0U CN202022371629U CN214125266U CN 214125266 U CN214125266 U CN 214125266U CN 202022371629 U CN202022371629 U CN 202022371629U CN 214125266 U CN214125266 U CN 214125266U
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- input
- limiting resistor
- pin
- interface circuit
- indicator light
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- 239000003990 capacitor Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
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Abstract
An indicator lamp interface circuit comprises an indicator lamp interface, a first current limiting resistor, an alternating current input optocoupler, a pull-down resistor and a second current limiting resistor. The indicator light interface has a first pin and a second pin for connecting with an indicator light. One end of the first current-limiting resistor is connected with the first pin, the other end of the first current-limiting resistor is connected with a first input end of the alternating current input optocoupler, and a second input end of the alternating current input optocoupler is connected with the second pin. A first output end of the alternating current input optocoupler is connected with the power supply, and a second output end of the alternating current input optocoupler is connected with one end of the pull-down resistor and one end of the second current-limiting resistor respectively. The other end of the pull-down resistor is grounded, and the other end of the second current-limiting resistor is connected with the MCU. The utility model discloses can avoid leading to the unable output signal's of receiving the pilot lamp condition of MCU because of the positive negative pole of pilot lamp signal line connects the mistake.
Description
Technical Field
The utility model relates to an indicator lamp interface circuit.
Background
At present, whether the positive and negative electrodes are connected in error or not is often needed to be careful when the signal line of the elevator key indicating lamp is installed on an indicating lamp interface, and once the positive and negative electrodes are connected in error, the MCU cannot acquire the signal of the indicating lamp. In order to avoid wiring errors, a large amount of detection time is required, and the time cost of workers is increased.
Disclosure of Invention
The utility model aims to solve the technical problem that an indicator lamp interface circuit is provided, it can avoid leading to the unable output signal's of receiving the pilot lamp of MCU because of the positive negative pole of pilot lamp signal line connects the wrong condition.
According to the utility model discloses the pilot lamp interface circuit, including the pilot lamp interface, the pilot lamp interface has first pin and the second pin that is used for being connected with the pilot lamp, its characteristics are that the pilot lamp interface circuit includes first current-limiting resistance, exchanges input opto-coupler, pull-down resistance and second current-limiting resistance; one end of the first current limiting resistor is connected with the first pin, the other end of the first current limiting resistor is connected with the first input end of the alternating current input optocoupler, and the second input end of the alternating current input optocoupler is connected with the second pin; a first output end of the alternating current input optocoupler is connected with a power supply, and a second output end of the alternating current input optocoupler is respectively connected with one end of the pull-down resistor and one end of the second current-limiting resistor; the other end of the pull-down resistor is grounded, and the other end of the second current-limiting resistor is connected with the MCU.
The utility model discloses at least, have following advantage:
1. the indicator lamp interface circuit of this embodiment is equipped with the alternating current input opto-coupler, and the input of alternating current input opto-coupler has two infrared emitting diode that anti-parallel is connected. Whether a signal wire of the indicator light is connected with a first pin and a second pin of an indicator light interface in a wrong way or not, one infrared emitting diode in the alternating current input optocoupler can be lightened, so that a signal is transmitted to a phototransistor in the alternating current input optocoupler, the MCU can acquire the signal output by the indicator light, the condition that the MCU cannot receive the output signal of the indicator light due to the fact that the anode and the cathode of the signal wire of the indicator light are connected in a wrong way is avoided, and the installation process is simplified;
2. the indicator lamp interface circuit of the embodiment is simple in structure and easy to implement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic circuit diagram of an indicator light interface circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a schematic circuit diagram of an indicator light interface circuit according to an embodiment of the present invention. As shown in fig. 1, the indicator light interface circuit according to an embodiment of the present invention includes an indicator light interface P1, a first current limiting resistor R1, an ac input optical coupler U1, a pull-down resistor R3, and a second current limiting resistor R4.
The indicator light interface P1 has a first pin 11 and a second pin 13 for connection to an indicator light (not shown). In this embodiment, the indicator light is an indicator light of an elevator key. The indicator light may be, for example, an LED indicator light.
One end of a first current limiting resistor R1 is connected with the first pin 11, the other end of the first current limiting resistor R1 is connected with a first input end of an alternating current input optocoupler U1, and a second input end of the alternating current input optocoupler U1 is connected with the second pin 13. A first output end of the alternating current input optocoupler U1 is connected with a power supply VDD, and a second output end of the alternating current input optocoupler U1 is connected with one end of the pull-down resistor R3 and one end of the second current limiting resistor R4 respectively. The other end of the pull-down resistor R3 is grounded, and the other end of the second current-limiting resistor R4 is connected with the MCU 100.
Further, the indicator lamp interface circuit comprises a voltage division resistor R2, one end of the voltage division resistor R2 is connected with the other end of the first current limiting resistor R1 and the first input end of the alternating current input optocoupler U1, and the other end of the voltage division resistor R1 is connected with the second pin 13 and the second input end of the alternating current input optocoupler U1.
Further, the indicator lamp interface circuit comprises a filter capacitor C1, one end of the filter capacitor C1 is connected with the other end of the first current limiting resistor R1 and the first input end of the alternating current input optocoupler U1, and the other end of the filter capacitor C1 is connected with the second pin 13 and the second input end of the alternating current input optocoupler U1.
The alternating current input optocoupler U1 is composed of a phototransistor and two gallium arsenide infrared emitting diodes which are reversely connected in parallel. No matter how the signal line of pilot lamp is connected with first pin 11 and second pin 13 of pilot lamp interface P1, can both light one of them infrared emission diode of interchange input opto-coupler U1 inside to give the signal and give the phototransistor inside interchange input opto-coupler U1, and then make MCU100 can gather the signal of pilot lamp output.
In this embodiment, the ac input optocoupler U1 is TLP 184.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. An indicator light interface circuit comprises an indicator light interface, wherein the indicator light interface is provided with a first pin and a second pin which are used for being connected with an indicator light, and the indicator light interface circuit is characterized by comprising a first current limiting resistor, an alternating current input optical coupler, a pull-down resistor and a second current limiting resistor;
one end of the first current-limiting resistor is connected with the first pin, the other end of the first current-limiting resistor is connected with a first input end of the alternating current input optocoupler, and a second input end of the alternating current input optocoupler is connected with the second pin; a first output end of the alternating current input optocoupler is connected with a power supply, and a second output end of the alternating current input optocoupler is respectively connected with one end of the pull-down resistor and one end of the second current-limiting resistor;
the other end of the pull-down resistor is grounded, and the other end of the second current-limiting resistor is connected with the MCU.
2. The interface circuit of claim 1, wherein the interface circuit of the indicator light comprises a voltage dividing resistor, one end of the voltage dividing resistor is connected to the other end of the first current limiting resistor and the first input end of the ac input optocoupler, and the other end of the voltage dividing resistor is connected to the second pin and the second input end of the ac input optocoupler.
3. The indicator lamp interface circuit according to claim 1 or 2, wherein the indicator lamp interface circuit comprises a filter capacitor, one end of the filter capacitor is connected to the other end of the first current limiting resistor and the first input end of the ac input optocoupler respectively, and the other end of the filter capacitor is connected to the second pin and the second input end of the ac input optocoupler respectively.
4. The indicator light interface circuit of claim 1, wherein the ac input optocoupler is a TLP184 model.
5. The indicator light interface circuit of claim 1 wherein the indicator light is an indicator light of an elevator button.
6. The indicator interface circuit of claim 1 or 5 wherein the indicator is an LED indicator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022371629.0U CN214125266U (en) | 2020-10-22 | 2020-10-22 | Indicator lamp interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022371629.0U CN214125266U (en) | 2020-10-22 | 2020-10-22 | Indicator lamp interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214125266U true CN214125266U (en) | 2021-09-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022371629.0U Expired - Fee Related CN214125266U (en) | 2020-10-22 | 2020-10-22 | Indicator lamp interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214125266U (en) |
-
2020
- 2020-10-22 CN CN202022371629.0U patent/CN214125266U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210903 |
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| CF01 | Termination of patent right due to non-payment of annual fee |