CN214626962U - Signal conversion circuit - Google Patents
Signal conversion circuit Download PDFInfo
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- CN214626962U CN214626962U CN202120983689.XU CN202120983689U CN214626962U CN 214626962 U CN214626962 U CN 214626962U CN 202120983689 U CN202120983689 U CN 202120983689U CN 214626962 U CN214626962 U CN 214626962U
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- photoelectric coupler
- conversion circuit
- signal conversion
- current source
- constant current
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Abstract
The utility model relates to a signal conversion circuit, signal conversion circuit includes: the device comprises a first power supply, a second power supply, a first photoelectric coupler, a second photoelectric coupler and a constant current source circuit. When the input signal is at low level, the second photoelectric coupler is cut off, the two input ends of the first photoelectric coupler are connected, the two output ends of the first coupler are connected, and the constant current source circuit is controlled to output NAMUR current signals corresponding to TTL low level; when the input signal is high level, the first photoelectric coupler is cut off, the two input ends of the second photoelectric coupler are connected, the two output ends of the second photoelectric coupler are connected, the constant current source circuit is controlled to output NAMUR current signals corresponding to the TTL high level, and the TTL level signals are converted into NAMUR current signals.
Description
Technical Field
The utility model relates to a signal conversion technology field especially relates to a signal conversion circuit.
Background
The NAMUR standard was originally used in the proximity switch industry, so its operating principle is defined in proximity switches, and its operating principle is: the sensor needs to provide a DC voltage of about 8V, and a 1.2mA to 2.1mA current signal is generated according to the distance of a metal object close to the sensor, the calibrated switch current is typically 1.55mA, an output signal change (from 0 to 1 or from OFF to ON) is generated when the current is from low to high or equal to 1.75mA, and an output signal change (from 1 to 0 or from ON to OFF) is generated when the current is from high to low or lower than 1.55 mA. So that it can check whether the metal objects are close.
The traditional TTL standard level is 0V (low level) and 5V (high level), when a device generating the TTL level and an instrument of which the input signal standard is NAMUE current signals carry out data transmission and signal acquisition, data transmission and signal acquisition cannot be carried out due to the fact that the TTL level standard is not matched with the NAMUR standard signals, and a conversion circuit capable of converting the TTL level signals into the NAMUR current signals needs to be provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a signal conversion circuit to the realization converts TTL level signal into NAMUR current signal.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a signal conversion circuit, signal conversion circuit is used for converting TTL level signal into NAMUR current signal, signal conversion circuit includes: the device comprises a first power supply, a second power supply, a first photoelectric coupler, a second photoelectric coupler and a constant current source circuit;
the first power supply is connected with the first input end of the first photoelectric coupler, the second input end of the first photoelectric coupler, the first input end of the second photoelectric coupler and the input signal end of the signal conversion circuit are connected, and the second input end of the second photoelectric coupler is grounded;
the first output end of the first photoelectric coupler, the first output end of the second photoelectric coupler and the power supply input end of the constant current source circuit are connected with the second power supply; the second output end of the first photoelectric coupler is connected with the first input end of the constant current source circuit, and the second output end of the second photoelectric coupler is connected with the second input end of the constant current source circuit; the output end of the constant current source circuit is connected with the output signal end of the signal conversion circuit.
Optionally, the constant current source circuit includes a first control resistor, a second control resistor, a bias resistor, a first triode and a second triode;
one end of the first control resistor is used as a first input end of the constant current source circuit and connected with a second output end of the first photoelectric coupler, and one end of the second control resistor is used as a second input end of the constant current source circuit and connected with a second output end of the second photoelectric coupler;
the other end of the first control resistor, the other end of the second control resistor, the base of the first triode and the emitting electrode of the second triode are connected;
an emitting electrode of the first triode is used as a power input end of the constant current source circuit and is connected with a second power supply, and a collector electrode of the first triode, a base electrode of the second triode and one end of the bias resistor are connected;
the other end of the bias resistor is grounded, and the collector of the second triode is used as the output end of the constant current source circuit and is connected with the output signal end of the signal conversion circuit.
Optionally, the first triode and the second triode are both NPN-type triodes.
Optionally, the first triode and the second triode are 9013 in model number.
Optionally, the resistance of the first control resistor is 348 Ω, the resistance of the second control resistor is 698 Ω, and the resistance of the bias resistor is 2k Ω.
Optionally, the model of the first photocoupler and the model of the second photocoupler are 4N 35.
Optionally, the voltage of the first power supply is 5V.
Optionally, the voltage of the second power supply is 24V.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model discloses a signal conversion circuit, signal conversion circuit includes: the device comprises a first power supply, a second power supply, a first photoelectric coupler, a second photoelectric coupler and a constant current source circuit; the first power supply is connected with the first input end of the first photoelectric coupler, the second input end of the first photoelectric coupler, the first input end of the second photoelectric coupler and the input signal end of the signal conversion circuit are connected, and the second input end of the second photoelectric coupler is grounded; the first output end of the first photoelectric coupler, the first output end of the second photoelectric coupler and the power supply input end of the constant current source circuit are connected with the second power supply; the second output end of the first photoelectric coupler is connected with the first input end of the constant current source circuit, and the second output end of the second photoelectric coupler is connected with the second input end of the constant current source circuit; the output end of the constant current source circuit is connected with the output signal end of the signal conversion circuit. When the input signal is at low level, the second photoelectric coupler is cut off, the two input ends of the first photoelectric coupler are connected, the two output ends of the first coupler are connected, and the constant current source circuit is controlled to output NAMUR current signals corresponding to TTL low level; when the input signal is high level, the first photoelectric coupler is cut off, the two input ends of the second photoelectric coupler are connected, the two output ends of the second photoelectric coupler are connected, the constant current source circuit is controlled to output NAMUR current signals corresponding to the TTL high level, and the TTL level signals are converted into NAMUR current signals.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in 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 inventive labor.
Fig. 1 is a schematic circuit diagram of a signal conversion circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a signal conversion circuit to the realization converts TTL level signal into NAMUR current signal.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the utility model provides a signal conversion circuit, this signal conversion circuit are used for converting TTL standard level signal into NAMUR standard signal, including first power VCC1, second power VCC2, first photoelectric coupler U1, second photoelectric coupler U2, INPUT signal end INPUT, OUTPUT signal end OUTPUT, by first triode Q1, second triode Q2, biasing resistance R1, second control resistance R2, the constant current source circuit that first control resistance R3 constitutes.
The models of the first photoelectric coupler U1 and the second photoelectric coupler U2 are both 4N35, a pin 1 (a first INPUT end) of the first photoelectric coupler U1 is connected with a first power supply VCC1, a pin 2 (a second INPUT end) of the first photoelectric coupler U1 is connected with an INPUT signal end INPUT, a pin 5 (a first output end) of the first photoelectric coupler U1 is connected with a second power supply VCC2, a pin 4 (a second output end) of the first photoelectric coupler U1 is connected with a first control resistor R3, and a pin 6 of the first photoelectric coupler U1 is suspended; a pin 1 (a first INPUT end) of a second photoelectric coupler U2 is connected with an INPUT signal end INPUT and is simultaneously connected with a pin 2 of a first photoelectric coupler U1, a pin 2 (a second INPUT end) of a second photoelectric coupler U2 is connected with the ground, a pin 5 (a first output end) of the second photoelectric coupler U2 is connected with a second power supply VCC2, a pin 4 (a second output end) of the second photoelectric coupler U2 is connected with a second control resistor R2, and a pin 6 of the U2 is suspended.
The second control resistor R2 is connected with the right end pin of the first control resistor R3, connected with the base electrode of the first triode Q1 and connected with the emitting electrode of the second triode Q2.
The second VCC2 is connected to the emitter of transistor Q1.
The collector of the first transistor Q1 is connected to the base of the second transistor Q2, and to one end of a bias resistor R1, and the other end of the bias resistor R1 is connected to ground.
The collector of the second triode Q2 is connected to the signal OUTPUT terminal OUTPUT, which OUTPUTs the converted NAMUR standard signal.
The first power supply VCC1 has a power supply voltage of 5V and the second power supply VCC2 has a power supply voltage of 24V.
The model of the first triode Q1 and the model of the second triode Q2 are 9013, the resistance value of the bias resistor R1 is 2 kilo-ohms, the resistance value of the second control resistor R2 is 698 ohms, and the resistance value of the first control resistor R3 is 348 ohms.
The utility model discloses a constant current source circuit is by first triode Q1, second triode Q2 and offset resistance R1 and second control resistance R2, first control resistance R3 constitutes different OUTPUT current's constant current source respectively, when input signal is the low level, second photoelectric coupler U2 ends, first photoelectric coupler U1 input is put through, U1's 5 feet and 4 feet put through, first control resistance R3 control constant current source OUTPUT current size this moment, signal OUTPUT part OUTPUT electric current size is 1.10 mA; when an input signal is at a high level, the first photoelectric coupler U1 is cut off, the input end of the second photoelectric coupler U2 is connected, the 5 pins and the 4 pins of the U2 are connected, at the moment, the first control resistor R2 controls the OUTPUT current of the constant current source, and the OUTPUT current of the signal OUTPUT end OUTPUT is 2.10 mA.
The signal conversion circuit provides a conversion circuit for converting a TTL level into NAMUR current output, when the TTL level is a high level, a current signal higher than 1.75mA is output, and when the TTL level is a low level, a current signal lower than 1.25mA is output, so that the requirement of NAMUR standard on current signal control is met.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. A signal conversion circuit for converting a TTL level signal to a NAMUR current signal, the signal conversion circuit comprising: the device comprises a first power supply, a second power supply, a first photoelectric coupler, a second photoelectric coupler and a constant current source circuit;
the first power supply is connected with the first input end of the first photoelectric coupler, the second input end of the first photoelectric coupler, the first input end of the second photoelectric coupler and the input signal end of the signal conversion circuit are connected, and the second input end of the second photoelectric coupler is grounded;
the first output end of the first photoelectric coupler, the first output end of the second photoelectric coupler and the power supply input end of the constant current source circuit are connected with the second power supply; the second output end of the first photoelectric coupler is connected with the first input end of the constant current source circuit, and the second output end of the second photoelectric coupler is connected with the second input end of the constant current source circuit; the output end of the constant current source circuit is connected with the output signal end of the signal conversion circuit.
2. The signal conversion circuit according to claim 1, wherein the constant current source circuit includes a first control resistor, a second control resistor, a bias resistor, a first transistor, and a second transistor;
one end of the first control resistor is used as a first input end of the constant current source circuit and connected with a second output end of the first photoelectric coupler, and one end of the second control resistor is used as a second input end of the constant current source circuit and connected with a second output end of the second photoelectric coupler;
the other end of the first control resistor, the other end of the second control resistor, the base of the first triode and the emitting electrode of the second triode are connected;
an emitting electrode of the first triode is used as a power input end of the constant current source circuit and is connected with a second power supply, and a collector electrode of the first triode, a base electrode of the second triode and one end of the bias resistor are connected;
the other end of the bias resistor is grounded, and the collector of the second triode is used as the output end of the constant current source circuit and is connected with the output signal end of the signal conversion circuit.
3. The signal conversion circuit of claim 2, wherein the first transistor and the second transistor are both NPN transistors.
4. The signal conversion circuit of claim 2, wherein the first transistor and the second transistor are of type 9013.
5. The signal conversion circuit of claim 2, wherein the first control resistor has a resistance of 348 Ω, the second control resistor has a resistance of 698 Ω, and the bias resistor has a resistance of 2k Ω.
6. The signal conversion circuit of claim 1, wherein the first photo coupler and the second photo coupler are 4N35 model.
7. The signal conversion circuit according to claim 1, wherein the voltage of the first power supply is 5V.
8. The signal conversion circuit of claim 1, wherein the voltage of the second power supply is 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120983689.XU CN214626962U (en) | 2021-05-10 | 2021-05-10 | Signal conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120983689.XU CN214626962U (en) | 2021-05-10 | 2021-05-10 | Signal conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214626962U true CN214626962U (en) | 2021-11-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120983689.XU Active CN214626962U (en) | 2021-05-10 | 2021-05-10 | Signal conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214626962U (en) |
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2021
- 2021-05-10 CN CN202120983689.XU patent/CN214626962U/en active Active
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| GR01 | Patent grant | ||
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Effective date of registration: 20220715 Address after: 653100 Guishan Street Xinping Avenue, Xinping Yi and Dai Autonomous County, Yuxi City, Yunnan Province Patentee after: Datang Yuxi new energy Co.,Ltd. Address before: No. 1110, building a, Nanyue City, Guangfu Road, Dianchi National Tourism Resort, Kunming, Yunnan 650000 Patentee before: New energy branch of Datang Yunnan Power Generation Co.,Ltd. Patentee before: North China Electric Power University (Baoding) |
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