CN210380807U - 5-24V compatible pulse receiving circuit - Google Patents
5-24V compatible pulse receiving circuit Download PDFInfo
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- CN210380807U CN210380807U CN201921411263.6U CN201921411263U CN210380807U CN 210380807 U CN210380807 U CN 210380807U CN 201921411263 U CN201921411263 U CN 201921411263U CN 210380807 U CN210380807 U CN 210380807U
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Abstract
The utility model provides a compatible 5-24V's pulse receiving circuit, including opto-coupler circuit with connect in opto-coupler circuit's pulse processing circuit, opto-coupler circuit includes the opto-coupler, pulse processing circuit connects in the opto-coupler input side, pulse processing circuit connects in positive end of pulse and pulse negative terminal, pulse processing circuit includes current-limiting circuit and voltage stabilizing circuit, current-limiting circuit establishes ties between opto-coupler input side and positive end of pulse, the pulse negative terminal, current-limiting circuit with the mutual parallel connection of voltage stabilizing circuit. The utility model discloses the circuit structure of circuit is simple, and can compatible 5-24V's pulse signal, whether outside pulse is higher than 5V and can all guarantee the normal switch-on of opto-coupler, does not need the outside to connect current-limiting resistor, and does not need additionally to increase the port.
Description
Technical Field
The utility model belongs to the technical field of the pulse processing circuit, especially, relate to a compatible 5-24V's pulse receiving circuit.
Background
The pulse receiving circuit of the pure high-speed optical coupler only supports single 5V, single 12V or single 24V, and cannot be simultaneously suitable for 5V, single 12V or single 24V pulses, for example, a 5V pulse receiving circuit shown in fig. 1, if 12V or 24V pulses need to be received at this time, a current-limiting resistor needs to be added at a pulse receiving port, so that the optical coupler is prevented from being burnt out.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide a compatible 5-24V's pulse receiving circuit system.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides a compatible 5-24V's pulse receiving circuit, include opto-coupler circuit and connect in opto-coupler circuit's pulse processing circuit, opto-coupler circuit includes the opto-coupler, pulse processing circuit connects in the opto-coupler input side, pulse processing circuit connects in positive end of pulse and pulse negative terminal, pulse processing circuit includes current-limiting circuit and voltage stabilizing circuit, current-limiting circuit establishes ties between opto-coupler input side and the positive end of pulse, the pulse negative terminal, current-limiting circuit with the mutual parallel connection of voltage stabilizing circuit.
In the above 5-24V compatible pulse receiving circuit, the current limiting circuit includes a current limiting resistor and a voltage dividing transistor, a collector of the voltage dividing transistor is connected to an output end of an input side of the optical coupler, an emission set of the voltage dividing transistor is connected to the current limiting resistor, the voltage stabilizing circuit includes a diode group, an input end of the diode group is connected to a base of the voltage dividing transistor, an output end of the diode group is connected to a side of the current limiting resistor far away from the voltage dividing transistor, and a common end of the diode group and the current limiting resistor is connected to a negative end of the pulse.
In the above 5-24V compatible pulse receiving circuit, a common terminal of the diode group and the current limiting resistor is connected to the pulse negative terminal through a first diode, and the diode group includes a second diode, a third diode and a fourth diode connected in series.
In the above 5-24V compatible pulse receiving circuit, a common terminal of the diode group and the voltage dividing transistor is connected to an input terminal of an input side of the optical coupler through a first resistor.
In the 5-24V compatible pulse receiving circuit, the pulse positive terminal is connected to the common terminal of the first resistor and the input terminal of the optical coupler input side through the second resistor.
In the 5-24V compatible pulse receiving circuit, the pulse negative terminal is connected to the side of the second resistor far away from the pulse positive terminal through the first capacitor.
In the 5-24V compatible pulse receiving circuit, a third resistor is connected in parallel between the collector and the emitter of the voltage division transistor.
In the above 5-24V compatible pulse receiving circuit, the optocoupler includes a light emitting diode as an input side and a phototransistor as an output side.
In the above pulse receiving circuit compatible with 5-24V, the type of the optocoupler is TLP 181.
In foretell compatible 5-24V's pulse receiving circuit, opto-coupler output side input passes through the fourth resistance and connects in the feeder ear, connects in the pulse signal end through the fifth resistance simultaneously, and opto-coupler output side output is connected in the earthing terminal, just be connected with the second electric capacity between opto-coupler output side input and the opto-coupler output side output, the fifth resistance is close to the pulse signal and distolaterally connects in the earthing terminal through the third electric capacity.
The utility model has the advantages of, the circuit structure of this circuit is simple, and can compatible 5-24V's pulse signal, whether outside pulse is higher than 5V and can all guarantee the normal switch-on of opto-coupler, does not need the outside to connect current-limiting resistor, and does not need additionally to increase the port.
Drawings
FIG. 1 is a prior art 5V pulse receiving circuit;
fig. 2 is a pulse receiving circuit according to the present invention.
Reference numerals: an optical coupler U1; a pulse positive terminal PUL +; negative pulse terminal PUL-; a current limiting circuit 2; a voltage stabilizing circuit 3; a current limiting resistor R11; a voltage dividing transistor Q6; a first diode Q1; a second diode Q2; a third diode Q3; a fourth diode Q4; a first capacitance C1; a first resistor R1; a second resistor R2; a third resistor R3; a light emitting diode 11; a photo transistor 12; a fourth resistor R4; a fifth resistor R5; a second capacitance C2; a third capacitance C3; pulse signal terminal PULS.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, this embodiment discloses a pulse receiving circuit compatible with 5-24V, including an optical coupler circuit and a pulse processing circuit connected to the optical coupler circuit, the optical coupler circuit includes an optical coupler U1, the pulse processing circuit is connected to the input side of the optical coupler, the pulse processing circuit is connected to the pulse positive terminal PUL + and the pulse negative terminal PUL-.
The optical coupler U1 of the present embodiment includes a light emitting diode 11 as an input side and a phototransistor 12 as an output side. For example, the optocoupler U1 may be of the type TLP 181.
Particularly, the pulse processing circuit comprises a current limiting circuit 2 and a voltage stabilizing circuit 3, the current limiting circuit 2 is connected in series between the input side of the optical coupler and a positive pulse end PUL + or a negative pulse end PUL-, and the current limiting circuit 2 and the voltage stabilizing circuit 3 are connected in parallel.
Specifically, the current limiting circuit 2 includes a current limiting resistor R11 and a voltage dividing transistor Q6, a collector of the voltage dividing transistor Q6 is connected to an output terminal on an input side of the optical coupler, an emission set of the voltage dividing transistor Q6 is connected to the current limiting resistor R11, the voltage stabilizing circuit 3 includes a diode group, an input terminal of the diode group is connected to a base of the voltage dividing transistor Q6, an output terminal of the diode group is connected to a side of the current limiting resistor R11 far away from the voltage dividing transistor Q6, and a common terminal of the diode group and the current limiting resistor R11 is connected to the negative pulse terminal PUL-. The model of the voltage dividing transistor Q6 can be PBSS 4320T.
Further, a diode group and a common terminal of the current limiting resistor R11 are connected to the pulse negative terminal PUL through a first diode Q1, and the diode group includes a second diode Q2, a third diode Q3 and a fourth diode Q4 connected in series. The first diode Q1, the second diode Q2, the third diode Q3, and the fourth diode Q4 may all be of the model MMBD 7000.
The current limiting resistor R11 is connected with the optocoupler U1 in series, so that the current of the optocoupler U1 is consistent with the current limiting resistor R11, and the current of the optocoupler U1 can be controlled only by controlling the current of the current limiting resistor R11. In the present embodiment, the voltage of the current limiting resistor R11 is regulated by the circuit structure, and since the resistance of the current limiting resistor R11 is constant and the voltage is also within a certain range, the current flowing through the current limiting resistor R11 does not exceed a certain value, which is determined by the resistance of the current limiting resistor R11 and the maximum voltage of the current limiting resistor R11.
For example, in this embodiment, the voltage drop of a single diode in the diode group is 0.75V, the sum of the three voltages is 2.25V, the voltage drop between the voltage dividing transistors BE is 1.1V at most, the sum of the voltage between the voltage dividing transistors BE and the voltage of the current limiting resistor R11 is equal to the sum of the voltages of the diode group, so the maximum current of the current limiting resistor R11 is 2.25-1.1 — 1.15V, and the current limiting resistor R11 can BE determined according to specific situations, for example, 150 ohms, 100 ohms, 200 ohms, and the like, and in this embodiment, 110 ohms is taken as an example, so that the maximum current that can BE passed by the current limiting resistor R11 is only 10mA no matter how large the external voltage is, that is, the maximum current that can BE passed by the optocoupler U1 is 10mA, and therefore, the situation that the optocoupler is.
Further, a common terminal of the diode group and the voltage division transistor Q6 is connected to the input terminal of the optical coupler input side through a first resistor R1. And the pulse positive terminal PUL + is connected with the common end of the first resistor R1 and the input end of the optical coupler input side through a second resistor R2.
The values of the first resistor R1 and the second resistor R2 may be 7.5K ohms and 51 ohms, respectively.
Further, the pulse negative terminal PUL-is connected to the side of the second resistor R2 away from the pulse positive terminal PUL + through a first capacitor C1, and the value of the first capacitor C1 is 1 nF; a third resistor R3 is connected in parallel between the collector and the emitter of the voltage dividing transistor Q6, and the value of the third resistor is 4.2K ohms.
Further, the input end of the output side of the optical coupler is connected to the 5V power supply end through a fourth resistor R4, the value of the fourth resistor R4 is 3K ohms, the input end of the output side of the optical coupler is connected to the pulse signal end PULS through a fifth resistor R5, and the value of the fifth resistor can be 2K ohms. The output end of the optical coupler output side is connected to the grounding end, a second capacitor C2 is connected between the input end of the optical coupler output side and the output end of the optical coupler output side, and a fifth resistor R5 is close to the PULS end PULS side and is connected to the grounding end through a third capacitor C3. The second capacitor C2 may take a value of 220PF and the third capacitor C3 may take a value of 47 PF.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the optocoupler U1 is used more here; a pulse positive terminal PUL +; negative pulse terminal PUL-; a current limiting circuit 2; a voltage stabilizing circuit 3; a current limiting resistor R11; a voltage dividing transistor Q6; a first diode Q1; a second diode Q2; a third diode Q3; a fourth diode Q4; a first capacitance C1; a first resistor R1; a second resistor R2; a third resistor R3; a light emitting diode 11; a photo transistor 12; a fourth resistor R4; a fifth resistor R5; a second capacitance C2; a third capacitance C3; pulse signal side PULS, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. The utility model provides a compatible 5-24V's pulse receiving circuit, include opto-coupler circuit and connect in opto-coupler circuit's pulse processing circuit, opto-coupler circuit includes opto-coupler (U1), pulse processing circuit connects in the opto-coupler input side, pulse processing circuit connects in positive end of pulse (PUL +) and negative end of pulse (PUL-), a serial communication port, pulse processing circuit includes current-limiting circuit (2) and voltage stabilizing circuit (3), current-limiting circuit (2) are established ties between opto-coupler input side and positive end of pulse (PUL +), negative end of pulse (PUL-), current-limiting circuit (2) with voltage stabilizing circuit (3) mutual parallel connection.
2. The 5-24V compatible pulse receiving circuit according to claim 1, wherein the current limiting circuit (2) comprises a current limiting resistor (R11) and a voltage dividing transistor (Q6), a collector of the voltage dividing transistor (Q6) is connected to an optical coupling input side output terminal, an emission set of the voltage dividing transistor (Q6) is connected to the current limiting resistor (R11), the voltage stabilizing circuit (3) comprises a diode group, an input terminal of the diode group is connected to a base terminal of the voltage dividing transistor (Q6), an output terminal of the diode group is connected to a side of the current limiting resistor (R11) far away from the voltage dividing transistor (Q6), and a common terminal of the diode group and the current limiting resistor (R11) is connected to the pulse negative terminal (PUL-).
3. The 5-24V compatible pulse receiving circuit according to claim 2, wherein a common terminal of the diode group and the current limiting resistor (R11) is connected to the pulse negative terminal (PUL-) through a first diode (Q1), and the diode group comprises a second diode (Q2), a third diode (Q3) and a fourth diode (Q4) connected in series with each other.
4. The 5-24V compatible pulse receiving circuit according to claim 3, wherein a common terminal of the diode group and the voltage dividing transistor (Q6) is connected to the input terminal of the optical coupler input side through a first resistor (R1).
5. The 5-24V compatible pulse receiving circuit according to claim 4, wherein the pulse positive terminal (PUL +) is connected to a common terminal of the first resistor (R1) and the input side of the optical coupler through a second resistor (R2).
6. 5-24V compatible pulse receiving circuit according to claim 5, characterized in that the pulse negative terminal (PUL-) is connected via a first capacitor (C1) to the side of the second resistor (R2) remote from the pulse positive terminal (PUL +).
7. The 5-24V compatible pulse receiving circuit of claim 2, wherein a third resistor (R3) is connected in parallel between the collector and the emitter of the voltage divider transistor (Q6).
8. The 5-24V compatible pulse receiving circuit according to any one of claims 1-7, wherein the optocoupler (U1) includes a light emitting diode (11) as an input side and a phototransistor (12) as an output side.
9. The 5-24V compatible pulse receiving circuit according to claim 8, wherein the type of the optocoupler (U1) is TLP 181.
10. The 5-24V compatible pulse receiving circuit according to claim 9, wherein the optical coupler output side input end is connected to the power supply end through a fourth resistor (R4), and is simultaneously connected to the pulse signal end (PULS) through a fifth resistor (R5), the optical coupler output side output end is connected to the ground end, a second capacitor (C2) is connected between the optical coupler output side input end and the optical coupler output side output end, and the fifth resistor (R5) is connected to the ground end through a third capacitor (C3) near the pulse signal end (PULS) side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921411263.6U CN210380807U (en) | 2019-08-28 | 2019-08-28 | 5-24V compatible pulse receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921411263.6U CN210380807U (en) | 2019-08-28 | 2019-08-28 | 5-24V compatible pulse receiving circuit |
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| Publication Number | Publication Date |
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| CN210380807U true CN210380807U (en) | 2020-04-21 |
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| CN201921411263.6U Active CN210380807U (en) | 2019-08-28 | 2019-08-28 | 5-24V compatible pulse receiving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585566A (en) * | 2020-06-10 | 2020-08-25 | 光惠（上海）激光科技有限公司 | Isolation digital input circuit compatible with 5V and 24V voltages |
| CN113708749A (en) * | 2021-09-30 | 2021-11-26 | 深圳市华浩德电子有限公司 | GaN compatible drive circuit |
-
2019
- 2019-08-28 CN CN201921411263.6U patent/CN210380807U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585566A (en) * | 2020-06-10 | 2020-08-25 | 光惠（上海）激光科技有限公司 | Isolation digital input circuit compatible with 5V and 24V voltages |
| CN113708749A (en) * | 2021-09-30 | 2021-11-26 | 深圳市华浩德电子有限公司 | GaN compatible drive circuit |
| CN113708749B (en) * | 2021-09-30 | 2023-08-29 | 深圳市华浩德电子有限公司 | GaN compatible drive circuit |
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