CN215378874U - Low current circuit based on coupler - Google Patents
Low current circuit based on coupler Download PDFInfo
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- CN215378874U CN215378874U CN202121771047.XU CN202121771047U CN215378874U CN 215378874 U CN215378874 U CN 215378874U CN 202121771047 U CN202121771047 U CN 202121771047U CN 215378874 U CN215378874 U CN 215378874U
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Abstract
The utility model provides a low current circuit based on coupler, is including connecting the optoelectronic coupler circuit between whole circuit input and switch output circuit to and the signal amplification circuit who connects at the output of optoelectronic coupler circuit, the key is: and a current amplifying circuit is also arranged between the input end of the whole circuit and the photoelectric coupler circuit. The photoelectric coupler circuit has the advantages that the current amplifying circuit is added at the front end of the photoelectric coupler circuit, so that the current signal can be amplified under the condition of small input current, and the adjustable voltage stabilizer is used for supporting, so that the amplified current signal is not distorted as much as possible, and the purpose of stable work is achieved. In addition, through the design of the transimpedance amplification circuit and the anti-phase amplification circuit, the signal output by the photoelectric coupler circuit is amplified through the two-stage amplification circuit, the circuit structure is simple, the number of components is small, the signal processing speed is high, the types of the components are small, and the batch cost is low.
Description
Technical Field
The utility model belongs to the technical field of circuits, relates to a nonlinear optical coupler circuit, and particularly relates to a coupler circuit capable of realizing transmission of a lower current signal.
Background
The optical coupler originates from the last 60 years, and has the advantages of electric isolation between input and output, long service life, strong anti-interference capability, unidirectional signal transmission realization and better performance in noise isolation. The photoelectric coupler is characterized in that a luminous body and a photosensitive element are packaged in a tube shell, the luminous body emits light signals after being electrified, and the photosensitive element receives the light signals and converts the light signals into electric signals, so that electric-light-electric signal transmission is realized. However, in some special industries, since the current signal flowing from the power supply is very weak, and the current is not enough to drive the light to operate, the coupler cannot collect the signal, and thus cannot realize transmission. With the wider application of the photoelectric coupler, people have higher requirements on the photoelectric coupler, namely the sensitivity problem of the photoelectric coupler, particularly the capture of a lower input current signal.
SUMMERY OF THE UTILITY MODEL
The utility model designs a low-current circuit based on a coupler, aiming at solving the technical problem that the optical coupler can work sensitively and stably under the condition of low input current.
The utility model adopts the technical scheme that a low-current circuit based on a coupler comprises a photoelectric coupler circuit connected between the input end of the whole circuit and a switch output circuit and a signal amplifying circuit connected at the output end of the photoelectric coupler circuit, and the key points are as follows: and a current amplifying circuit is also arranged between the input end of the whole circuit and the photoelectric coupler circuit.
The current amplifying circuit comprises an eighth triode, an adjustable voltage stabilizer, a variable resistor and a matched resistor, wherein a collector of the eighth triode and a negative electrode of input current are used as an output end of the current amplifying circuit to be connected with an input end of the photoelectric coupler circuit.
The signal amplification circuit comprises a transimpedance amplification circuit and an inverting amplification circuit, the transimpedance amplification circuit is connected to the output end of the photoelectric coupler circuit, the output end of the transimpedance amplification circuit is connected with the input end of the inverting amplification circuit, and the output end of the inverting amplification circuit is connected with the switch output circuit.
The input end of the switch output circuit is also provided with an enabling control circuit, and the output end of the enabling control circuit and the output end of the inverting amplifying circuit are simultaneously connected with the input end of the switch output circuit.
The transimpedance amplifier circuit comprises a first triode, a second triode and a peripheral matched resistor, wherein the base of the first triode is connected with the output end of a photoelectric coupler circuit, the collector of the first triode is connected with the first resistor to a power supply, the emitter of the first triode is grounded, the output end of the photoelectric coupler circuit is connected with a first divider resistor to be grounded, the base of the second triode is connected with the collector of the first triode, the emitter of the second triode is connected with a third resistor to be grounded, the collector of the second triode is connected with the power supply, and the voltage dividing point of the first divider resistor serves as the output end of the transimpedance amplifier circuit.
The inverting amplifying circuit comprises a third triode, a fourth triode and a peripheral matched resistor, wherein the base of the third triode is connected to the output end of the transimpedance amplifying circuit through the fourth resistor, the collector of the third triode is connected with a fifth resistor to a power supply, the emitter of the third triode is grounded, the fourth resistor is connected with a second divider resistor to be grounded, the base of the fourth triode is connected with the collector of the third triode, the emitter of the fourth triode is connected with a seventh resistor to be grounded, the collector of the fourth triode is connected with the power supply, and the voltage dividing point of the second divider resistor serves as the output end of the inverting amplifying circuit.
The enabling control circuit comprises a fifth triode, a sixth triode and a peripheral matched resistor, the base electrode of the fifth triode is used as the input end of a manual enabling signal, the collector electrode of the fifth triode is connected with an eighth resistor to a power supply, the base electrode of the sixth triode is connected with the collector electrode of the fifth triode, the collector electrode of the sixth triode is connected with a ninth resistor to the power supply, the emitting electrodes of the fifth triode and the sixth triode are jointly grounded, and the collector electrode of the sixth triode is used as the output end of the enabling control circuit.
The switch output circuit comprises a seventh triode and a tenth resistor, the base electrode of the seventh triode is connected with the output end of the inverting amplifying circuit, the emitting electrode of the seventh triode is grounded, the collecting electrode of the seventh triode is connected with the tenth resistor to a power supply, and the collecting electrode of the seventh triode is used as the output end of the high-speed nonlinear circuit.
The photoelectric coupler circuit is a photoelectric coupler consisting of a light emitting diode and a phototriode.
The seventh triode adopts a Schottky clamping triode.
The photoelectric coupler circuit has the advantages that the current amplifying circuit is added at the front end of the photoelectric coupler circuit, so that the current signal can be amplified under the condition of small input current, and the adjustable voltage stabilizer is used for supporting, so that the amplified current signal is not distorted as much as possible, and the purpose of stable work is achieved. In addition, through the design of the transimpedance amplification circuit and the anti-phase amplification circuit, the signal output by the photoelectric coupler circuit is amplified through the two-stage amplification circuit, the circuit structure is simple, the number of components is small, the signal processing speed is high, the types of the components are small, and the batch cost is low.
Drawings
Fig. 1 is a schematic block diagram of the circuit of the present invention.
Fig. 2 is a schematic diagram of an embodiment of the present invention.
In the drawing, 1 is a current amplifying circuit, 2 is a photocoupler circuit, 3 is a transimpedance amplifying circuit, 4 is an inverting amplifying circuit, 5 is an enable control circuit, 6 is a switching output circuit, and in the schematic view of the circuit embodiment, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, R5 is a fifth resistor, R6 is a sixth resistor, R7 is a seventh resistor, R8 is an eighth resistor, R9 is a ninth resistor, R10 is a tenth resistor, R11 is an eleventh resistor, R42 is a twelfth resistor, R13 is a variable resistor, wherein R2 and R3 form a first voltage-dividing resistor, R6 and R7 form a second voltage-dividing resistor, Q1 is a first triode, Q2 is a second triode, Q597 is a third triode, Q4 is a fourth voltage-dividing resistor, Q5 is a fifth voltage-dividing resistor, Q8672 is a sixth voltage-dividing resistor, and Q5 is an eighth triode 5, u2 is an adjustable voltage regulator, Vin represents the input terminal of the whole circuit, Vout represents the output terminal of the whole circuit, and Ve represents the enable control terminal of the whole circuit.
Detailed Description
The utility model is further illustrated by the following specific examples.
Referring to fig. 1, a low current circuit based on a coupler includes a photocoupler circuit 2 connected between the input end of the whole circuit and a switch output circuit 6, and a signal amplifying circuit connected at the output end of the photocoupler circuit 2, and the key is: a current amplifying circuit 1 is also arranged between the input end of the whole circuit and the photoelectric coupler circuit 2.
The operating principle of the current amplification circuit 1 is as follows: when whole circuit input current is less, the eighth triode Q8 among the current amplification circuit 1 can be with current amplification, can stabilize the output voltage that wants the enlargies according to the needs of back stage circuit through the adjustable voltage regulator U2 that sets up moreover, and then guarantee that optoelectronic coupler circuit 2 can normally stable work, even less input current, also can guarantee that opto-coupler U1 opens.
The signal amplification circuit comprises a transimpedance amplification circuit 3 and an inverting amplification circuit 4, the transimpedance amplification circuit 3 is connected to the output end of the photoelectric coupler circuit 2, the output end of the transimpedance amplification circuit 3 is connected with the input end of the inverting amplification circuit 4, and the output end of the inverting amplification circuit 4 is connected with a switch output circuit 6.
An enabling control circuit 5 is further arranged at the input end of the switch output circuit 6, and the output end of the enabling control circuit 5 and the output end of the inverting amplifying circuit 4 are simultaneously connected with the input end of the switch output circuit 6.
The operational principle of the transimpedance amplifier circuit 3 and the inverting amplifier circuit 4 is as follows: after receiving the current of the photoelectric coupler circuit 2, the transimpedance amplification circuit 3 converts the current into a voltage signal, and the conversion of the current signal into the voltage signal is a signal amplification process, but the voltage at the moment is not enough to drive a device at the output end, then the voltage signal is given to the inverse amplification circuit 4, the voltage signal is amplified again by the inverse amplification circuit 4, and the direct current gain can reach 20.5dB through the enabling input signal Ve matched with the enabling control circuit 5, so that the switch output circuit 6 is switched on, and the signal to be transmitted is output.
If do not set up enable control circuit 5, also can realize the fast effect of signal transmission speed, because enable control circuit 5 is equivalent to artificial for having increased a switch, open when wanting to open, and can not receive photoelectric coupler circuit 2's influence during the closure again, the level that has just also acquiesced enable control circuit 5 in other words is the high level all the time, photoelectric coupler circuit 2 switches on promptly, Vout output low level, photoelectric coupler circuit 2 closes, Vout output high level. After the enable control circuit 5 is added, after the conditions of the photoelectric coupler circuit 2 and the enable control circuit 5 are both satisfied, the Vout outputs a low level, otherwise, the Vout outputs a high level. Therefore, the addition of the enable control circuit 5 realizes time sequence control, and enables signal transmission to be more accurate and stable according to pulse modulation.
Referring to fig. 2, a schematic diagram design scheme is shown.
The current amplifying circuit 1 comprises an eighth triode Q8, an adjustable voltage regulator U2, a variable resistor R13 and a matched resistor, wherein the collector of the eighth triode Q8 and the negative electrode of input current are used as the output end of the current amplifying circuit and are connected with the input end of the photoelectric coupler circuit 2. The model of the adjustable voltage regulator U2 may be LM 317.
The transimpedance amplification circuit 3 comprises a first triode Q1, a second triode Q2 and a peripheral matched resistor, the base electrode of the first triode Q1 is connected with the output end of the photoelectric coupler circuit 2, the collector electrode of the first triode Q1 is connected with a first resistor R1 to a power supply Vcc, the emitter electrode of the first triode Q1 is grounded, the output end of the photoelectric coupler circuit 2 is connected with a first voltage division resistor R2, the ground is connected with R3, the base electrode of the second triode Q2 is connected with the collector electrode of the first triode Q1, the emitter electrode of the second triode Q2 is connected with the ground of a third resistor R3, the collector electrode of the second triode Q2 is connected with the power supply Vcc, and the voltage division points of the first voltage division resistors R2 and R3 are used as the output end of the transimpedance amplification circuit 3.
The inverting amplifying circuit 4 comprises a third triode Q3, a fourth triode Q4 and peripheral matched resistors, the base of the third triode Q3 is connected to the output end of the transimpedance amplifying circuit 3 through a fourth resistor R4, the collector of the third triode Q3 is connected with a fifth resistor R5 to a power supply Vcc, the emitter of the third triode Q3 is grounded, the fourth resistor R4 is connected with a second voltage-dividing resistor R6 and a R7 ground, the base of the fourth triode Q4 is connected with the collector of the third triode Q3, the emitter of the fourth triode Q4 is connected with a seventh resistor R7 ground, the collector of the fourth triode Q4 is connected with the power supply Vcc, and the voltage-dividing points of the second voltage-dividing resistors R6 and R7 are used as the output end of the inverting amplifying circuit 4.
The enabling control circuit 5 comprises a fifth triode Q5, a sixth triode Q6 and a peripheral matched resistor, wherein the base electrode of the fifth triode Q5 is used as an input end of a manual enabling signal, the collector electrode of the fifth triode Q5 is connected with an eighth resistor R8 to a power supply Vcc, the base electrode of the sixth triode Q6 is connected with the collector electrode of the fifth triode Q5, the collector electrode of the sixth triode Q6 is connected with a ninth resistor R9 to the power supply Vcc, the emitter electrodes of the fifth triode Q5 and the sixth triode Q6 are connected to the ground together, and the collector electrode of the sixth triode Q6 is used as an output end of the enabling control circuit 5.
The switch output circuit 6 comprises a seventh triode Q7 and a tenth resistor R10, wherein the base of the seventh triode Q7 is connected with the output end of the inverting amplifying circuit 4, the emitter of the seventh triode Q7 is grounded, the collector of the seventh triode Q7 is connected with the tenth resistor R10 to the power supply Vcc, and the collector of the seventh triode Q7 is used as the output end of the high-speed nonlinear circuit.
The photoelectric coupler circuit 2 is a photoelectric coupler U1 composed of a light emitting diode and a phototriode. In consideration of the accuracy of signal transmission, the wavelength of light emitted from the light emitting diode must be well matched with that of the phototriode. The phototriode may be a silicon phototriode with a peak wavelength of about 900 nm. The light emitting device adopts a light emitting diode made of Ga, Al and As materials, and the peak wavelength of the light emitting diode is set to 870 nm.
The seventh transistor Q7 employs a schottky-clamp transistor. The rectification current is large, and meanwhile, the requirement of high overall switching speed can be met.
In the specific implementation of the present invention, referring to the specific schematic diagram of the circuit in fig. 2, when the input current is small, assuming that only 50mA is available, the current is amplified by the boost of the adjustable regulator U2 and the eighth transistor Q8, assuming that the current is amplified by 10 times to 0.5A, and at this time, the photocoupler U1 is already on and the enable control terminal Ve is high, the base of the first transistor Q1 receives the weak current, after the weak current is amplified twice by the first transistor Q1 and the second transistor Q2, the emitter of the second transistor Q2 is converted into a voltage signal after the voltage division of the first voltage dividing resistor R2 and the R3, and the voltage signal is output to the base of the third transistor Q3, the third transistor Q3, the fourth transistor Q48 and the resistors R4-R7 together form an inverting amplifier, when the voltage of the third transistor Q3 rises, the voltage across the resistor R4, the R6, the resistor R7 are connected in series, so that the voltage across the resistor R7 is low, the fourth triode Q4 is turned on, the voltage of the emitter of the fourth triode Q4 is basically unchanged, the current signal is further increased, the seventh triode Q7 is driven to be in a saturation state, and the collector Vout of the seventh triode Q7 outputs a low level; if the photoelectric coupler U1 can not be started or the enable control end Ve is low when the current is amplified by 10 times, the seventh triode Q7 is cut off, and Vout outputs high level.
Claims (10)
1. The utility model provides a low current circuit based on coupler, is including connecting optoelectronic coupler circuit (2) between whole circuit input and switch output circuit (6) to and the signal amplification circuit who connects at the output of optoelectronic coupler circuit (2), its characterized in that: and a current amplifying circuit (1) is also arranged between the input end of the whole circuit and the photoelectric coupler circuit (2).
2. A coupler based low current circuit as claimed in claim 1, wherein: the current amplification circuit (1) comprises an eighth triode (Q8), an adjustable voltage stabilizer (U2), a variable resistor (R13) and a matched resistor, wherein the collector of the eighth triode (Q8) and the negative electrode of input current are used as the output end of the current amplification circuit to be connected with the input end of the photoelectric coupler circuit (2).
3. A coupler based low current circuit as claimed in claim 1, wherein: the signal amplification circuit comprises a trans-resistance amplification circuit (3) and an inverse amplification circuit (4), the trans-resistance amplification circuit (3) is connected to the output end of the photoelectric coupler circuit (2), the output end of the trans-resistance amplification circuit (3) is connected to the input end of the inverse amplification circuit (4), and the output end of the inverse amplification circuit (4) is connected with the switch output circuit (6).
4. A coupler based low current circuit as claimed in claim 1, wherein: an enabling control circuit (5) is further arranged at the input end of the switch output circuit (6), and the output end of the enabling control circuit (5) and the output end of the inverting amplification circuit (4) are simultaneously connected with the input end of the switch output circuit (6).
5. A coupler based low current circuit as claimed in claim 3, wherein: the transimpedance amplifier circuit (3) comprises a first triode (Q1), a second triode (Q2) and a peripheral matched resistor, the base electrode of the first triode (Q1) is connected with the output end of a photoelectric coupler circuit (2), the collector electrode of the first triode (Q1) is connected with a first resistor (R1) to a power supply (Vcc), the emitter electrode of the first triode (Q1) is grounded, the output end of the photoelectric coupler circuit (2) is connected with a first voltage dividing resistor (R2), R3) is grounded, the base electrode of the second triode (Q2) is connected with the collector electrode of the first triode (Q1), the emitter electrode of the second triode (Q2) is connected with a third resistor (R3) which is grounded, the collector electrode of the second triode (Q2) is connected with the power supply (Vcc), and the voltage point of the first voltage dividing resistor (R2 and R3) is used as the output end of the transimpedance amplifier circuit (3).
6. A coupler based low current circuit as claimed in claim 3, wherein: the inverting amplifying circuit (4) comprises a third triode (Q3), a fourth triode (Q4) and a peripheral matched resistor, the base of the third triode (Q3) is connected to the output end of the transimpedance amplifying circuit (3) through a fourth resistor (R4), the collector of the third triode (Q3) is connected with a fifth resistor (R5) to a power supply (Vcc), the emitter of the third triode (Q3) is grounded, the fourth resistor (R4) is connected with a second divider resistor (R6, R7) to ground, the base of the fourth triode (Q4) is connected with the collector of the third triode (Q3), the emitter of the fourth triode (Q4) is connected with a seventh resistor (R7) to ground, the collector of the fourth triode (Q4) is connected with the power supply (Vcc), and the dividing points of the second divider resistors (R6, R7) are used as the output end of the inverting amplifying circuit (4).
7. A coupler based low current circuit according to claim 4, wherein: the enabling control circuit (5) comprises a fifth triode (Q5), a sixth triode (Q6) and a peripheral matched resistor, the base electrode of the fifth triode (Q5) is used as the input end of a manual enabling signal, the collector electrode of the fifth triode (Q5) is connected with an eighth resistor (R8) to a power supply (Vcc), the base electrode of the sixth triode (Q6) is connected with the collector electrode of the fifth triode (Q5), the collector electrode of the sixth triode (Q6) is connected with a ninth resistor (R9) to the power supply (Vcc), the emitter electrodes of the fifth triode (Q5) and the sixth triode (Q6) are grounded together, and the collector electrode of the sixth triode (Q6) is used as the output end of the enabling control circuit (5).
8. A coupler based low current circuit as claimed in claim 3, wherein: the switch output circuit (6) comprises a seventh triode (Q7) and a tenth resistor (R10), the base electrode of the seventh triode (Q7) is connected with the output end of the inverting amplification circuit (4), the emitter electrode of the seventh triode (Q7) is grounded, the collector electrode of the seventh triode (Q7) is connected with the tenth resistor (R10) to a power supply (Vcc), and the collector electrode of the seventh triode (Q7) is used as the output end of the high-speed nonlinear circuit.
9. A coupler based low current circuit as claimed in claim 3, wherein: the photoelectric coupler circuit (2) is a photoelectric coupler (U) composed of a light emitting diode and a phototriode.
10. A coupler based low current circuit as claimed in claim 8, wherein: the seventh triode (Q7) adopts a Schottky clamping triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121771047.XU CN215378874U (en) | 2021-07-30 | 2021-07-30 | Low current circuit based on coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121771047.XU CN215378874U (en) | 2021-07-30 | 2021-07-30 | Low current circuit based on coupler |
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| Publication Number | Publication Date |
|---|---|
| CN215378874U true CN215378874U (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121771047.XU Active CN215378874U (en) | 2021-07-30 | 2021-07-30 | Low current circuit based on coupler |
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| CN (1) | CN215378874U (en) |
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2021
- 2021-07-30 CN CN202121771047.XU patent/CN215378874U/en active Active
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Address after: 315336 plant 23 and 24, No. 68, Yuhai East Road, Hangzhou Bay New Area, Ningbo City, Zhejiang Province Patentee after: Ningbo Qunxin Microelectronics Co.,Ltd. Address before: 315336 plant 23 and 24, No. 68, Yuhai East Road, Hangzhou Bay New Area, Ningbo City, Zhejiang Province Patentee before: Ningbo qunzi Microelectronics Co.,Ltd. |