CN113242036B - CTR (control line) adjustable method, optocoupler circuit and device - Google Patents
CTR (control line) adjustable method, optocoupler circuit and device Download PDFInfo
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- CN113242036B CN113242036B CN202110501114.4A CN202110501114A CN113242036B CN 113242036 B CN113242036 B CN 113242036B CN 202110501114 A CN202110501114 A CN 202110501114A CN 113242036 B CN113242036 B CN 113242036B
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- H03—ELECTRONIC CIRCUITRY
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- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
- H03K19/017572—Coupling arrangements; Impedance matching circuits using opto-electronic devices
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Abstract
The invention discloses a CTR (control line) adjustable method, an optical coupler circuit and a device, wherein the method comprises the following steps: an adjustable constant current circuit is arranged at the output end of the optocoupler; the current value of the adjustable constant current circuit can be adjusted; and controlling the base input current of the optocoupler through the adjustable constant current circuit to obtain different CTR values. The optocoupler circuit comprises an adjustable constant current source module, and one end of the adjustable constant current source module is electrically connected with a base pin of the optocoupler. The device comprises a control circuit board, wherein the control circuit board is provided with a CTR adjustable optocoupler circuit so as to obtain different CTR values. The base input current of the output end of the optocoupler is controlled to obtain different CTR values by changing the resistance value of the adjustable resistor or a bias circuit in the adjustable constant current source circuit, so that the adjustment of the optocoupler CTR is realized, and the requirement of a specific CTR is met.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a CTR adjustable method, an optocoupler circuit, and a device.
Background
Optocouplers (opticalcoupler equipment, abbreviated OCEP) are also known as opto-isolators or optocouplers, abbreviated optocouplers. It is a device for transmitting electric signals by using light as medium, and usually a light emitter (infrared light emitting diode LED) and a light receiver (photo-sensitive semiconductor tube, photo-resistor) are packaged in the same package. When the input end is powered on, the light emitter emits light, and the light receiver receives the light to generate photocurrent, and the photocurrent flows out of the output end, so that the 'electro-optical-electrical' control is realized. The photoelectric coupler has the advantages of small volume, long service life, no contact, strong anti-interference capability, insulation between output and input, unidirectional signal transmission and the like, and is widely applied to digital circuits.
The current transmission ratio CTR (Current Transfer Radio) is a key index of the optocoupler, and refers to the ratio of the output current of the phototransistor to the input current of the light emitting diode, which is multiplied by 100%. For example: input current is 5mA, output current is 15mA, then ctr=15/5×100% =300.
However, in actual production, once the optocoupler product is produced, the CTR is fixed and cannot be adjusted. Some application occasions have specification requirements on CTR, and the CTR can be selected only by a manual screening method, so that the CTR has low efficiency and high cost.
Therefore, there is a need to provide a CTR-adjustable method, an optocoupler circuit and a device for solving the problems in the prior art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a CTR adjustable method, an optical coupler circuit and a device.
In order to achieve the above purpose, the present invention provides a method for adjusting a CTR of an optocoupler, wherein the optocoupler is an input optocoupler with a base at one side of an output end, and the method comprises the following steps:
providing a stable working current at the input end of the optocoupler;
an adjustable constant current circuit is arranged at the output end of the optocoupler;
and controlling the base input current of the optocoupler through the adjustable constant current circuit to obtain different CTR values.
Preferably, the adjustable constant current circuit comprises any mode of setting an adjustable resistor or an adjustable constant current source module.
Preferably, the magnitude of the base input current of the optocoupler is controlled to obtain different CTR values by changing any one of the resistance value of the adjustable resistor and the bias circuit in the adjustable constant current source module.
The invention also provides an optical coupler adjustable circuit, which comprises an optical coupler, wherein an adjustable constant current circuit is arranged at the output end of the optical coupler, and one end of the adjustable constant current circuit is electrically connected with a base pin of the optical coupler.
Preferably, the adjustable constant current circuit comprises an adjustable resistor, one end of the adjustable resistor is electrically connected with the base pin of the optocoupler, and the other end of the adjustable resistor is electrically connected with the collector pin of the optocoupler.
Preferably, the adjustable constant current circuit comprises an adjustable constant current source module, and one end of the adjustable constant current source module is electrically connected with a base pin of the optocoupler.
Preferably, the adjustable constant current source module comprises a bias circuit module, an operational amplifier circuit module, an amplifying circuit module and a feedback circuit module, wherein the bias circuit module is electrically connected with the operational amplifier circuit module, the operational amplifier circuit module is electrically connected with the amplifying circuit module, the amplifying circuit module is electrically connected with the feedback circuit module, and the amplifying circuit module is electrically connected with a base pin of the optocoupler.
Preferably, the bias circuit module comprises an adjustable resistor; the operational amplifier circuit module comprises an operational amplifier; the amplifying circuit module comprises a transistor; the feedback circuit module comprises a sampling resistor; the adjustable resistor is characterized in that the adjusting end of the adjustable resistor is electrically connected with the positive input end of the operational amplifier, the negative input end of the operational amplifier and the emitter of the transistor are electrically connected with one end of the sampling resistor, the output end of the operational amplifier is electrically connected with the base electrode of the transistor, and one end of the collector of the transistor is electrically connected with the base electrode pin of the optocoupler.
Preferably, the bias circuit module further comprises a first resistor and a zener diode, one end of the positive electrode of the zener diode is electrically connected with one end of the first resistor and one end of the adjustable resistor, a power pin of the operational amplifier, a negative electrode of the zener diode, the other end of the sampling resistor and the other end of the adjustable resistor are all connected with a power supply, and a ground pin of the operational amplifier and the other end of the first resistor are all grounded.
The invention also provides an optical coupler adjustable device, which comprises a control circuit board, wherein the control circuit board is provided with the CTR adjustable optical coupler circuit so as to obtain different CTR values.
Compared with the prior art, the invention has the beneficial effects that:
1. a CTR adjustable method, an optocoupler circuit and a device control the base input current of the optocoupler to obtain different CTR values by changing the resistance value of an adjustable resistor or a bias circuit in an adjustable constant current source module, thereby realizing the adjustment of the CTR of the optocoupler and meeting the requirements of specific CTR.
2. The bias circuit module can provide stable voltage input for the adjustable constant current source module; the operational amplifier circuit module forms a negative feedback circuit; the amplifying circuit module provides proper current for the circuit; the feedback circuit module feeds back the load current in real time through the sampling resistor; therefore, stable output and control adjustment of the constant current source circuit module are ensured, and the optocoupler CTR is stable and adjustable.
Drawings
In order to more clearly illustrate the solution of the present invention, a brief description will be given below of the drawings required for the description of the embodiments of the present invention, it being apparent that the drawings in the following description are some embodiments of the present invention, and that other drawings may be obtained from these drawings without the exercise of inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a method structure according to a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a second embodiment of the present invention;
FIG. 3 is a table of experimental data for a circuit according to a second embodiment of the present invention;
FIG. 4 is a graph based on FIG. 3;
fig. 5 is a schematic circuit diagram of a modified embodiment of the second embodiment of the present invention;
fig. 6 is a schematic block diagram of the structure of a third embodiment of the present invention.
Reference numerals illustrate:
1. an adjustable constant current circuit; 2. an adjustable constant current source module; 21. a bias circuit module; 22. an operational circuit module; 23. an amplifying circuit module; 24. and a feedback circuit module.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The terms "comprising" and "having" and any variations thereof in the description of the invention and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. The terms "upper," "lower," "left," "right," "front," "rear," "side," and the like in the description and claims of the invention or in the above-described drawings are used for relative positional description with respect to the provided drawings and are not intended to describe a particular order of actual products.
Referring to fig. 1, a first embodiment of the present invention provides a method for adjusting a CTR of an optical coupler, which is an input optical coupler with a base at one side of an output end, comprising the following steps:
step S1: providing a stable working current at the input end of the optocoupler;
step S2: an adjustable constant current circuit is arranged at the output end of the optocoupler;
step S3: and controlling the base input current of the optocoupler by an adjustable constant current circuit to obtain different CTR values.
Further, the adjustable circuit mode comprises any mode of setting an adjustable resistor or an adjustable constant current source module, and different CTR values are obtained by changing the resistance value of the adjustable resistor or a bias circuit in the adjustable constant current source module and controlling the magnitude of base input current of the optocoupler.
Referring to fig. 2, according to a first embodiment of the present invention, an optocoupler CTR adjusting method is further provided, which includes an optocoupler U3, an adjustable constant current circuit 1 is disposed at an output end of the optocoupler U3, one end of the adjustable constant current circuit 1 is electrically connected to a base pin of the optocoupler U3, specifically, the adjustable constant current circuit 1 includes an adjustable resistor Rx, one end of the adjustable resistor Rx is electrically connected to the base pin of the optocoupler U3, and the other end of the adjustable resistor Rx is electrically connected to a collector pin of the optocoupler U3. The external adjustable resistor Rx is adjusted to adjust the optocoupler CTR, so that the requirement of a specific CTR is met.
In order to be more clearly understood, the second embodiment of the present invention provides a set of experimental data for setting the adjustable resistor Rx, as shown in fig. 3 and 4, when the resistance of the adjustable resistor Rx is smaller, the value of the optocoupler CTR is larger, so that the adjustment of the optocoupler CTR is realized through circuit design, and the problems of low efficiency and non-adjustability are solved.
Referring to fig. 5, a second embodiment of the present invention further provides a modified embodiment, where the adjustable constant current circuit 1 includes an adjustable constant current source module 2, and one end of the adjustable constant current source module 2 is electrically connected to a base pin of the optocoupler U3. The adjustable constant current source module 2 comprises a bias circuit module 21, an operational amplifier circuit module 22, an amplifying circuit module 23 and a feedback circuit module 24, wherein the bias circuit module 21 is electrically connected with the operational amplifier circuit module 22, the operational amplifier circuit module 22 is electrically connected with the amplifying circuit module 23, the amplifying circuit module 23 is electrically connected with the sampling circuit module, and the feedback circuit module 24 is electrically connected with a base pin of the optocoupler U3. The adjustable constant current source module 2 can be provided with a stable voltage input by the bias circuit module 21.
Specifically, the bias circuit module 21 includes an adjustable resistor Rx; the operational amplifier circuit module 22 includes an operational amplifier U2; the amplifying circuit block 23 includes a transistor Q1; the sampling circuit module comprises a sampling resistor Rf; the adjusting end of the adjustable resistor Rx is electrically connected with the positive input end of the operational amplifier U2, the negative input end of the operational amplifier U2 and the emitter of the transistor Q1 are electrically connected with one end of the sampling resistor Rf, and thus, the operational amplifier circuit module forms a negative feedback circuit. The output end of the operational amplifier U2 is electrically connected with the base electrode of the transistor Q1, and the transistor has the volt-ampere characteristic of saturated output current, so that the stability of the current is ensured. One end of the collector electrode of the transistor is electrically connected with the base pin of the optocoupler U3. The amplifying circuit module provides proper current for the circuit; the feedback circuit module feeds back the load current in real time through the sampling resistor; therefore, stable output and control adjustment of the constant current source circuit module are ensured, and the optocoupler CTR is stable and adjustable.
Further, the bias circuit module 21 further includes a first resistor R1 and a zener diode D1, wherein one end of the positive pole of the zener diode D1 is electrically connected to one end of the first resistor R1 and one end of the adjustable resistor Rx, and the power pin of the operational amplifier U2, the negative pole of the zener diode D1, the other end of the sampling resistor Rf and the other end of the adjustable resistor Rx are all connected to power supplies, which are any power supplies in the prior art, and are not limited herein. The ground pin of the operational amplifier U2 and the other end of the first resistor R1 are grounded.
In order to more clearly understand the modified embodiment, the calculation formula of the resistance value of the first resistor R1: r1 is less than or equal to (VCC 1-Vd 1)/(Izmin+Vd1/Rx), (1)
Wherein Izmin is the minimum regulated current of the zener diode D1, vd1 is the voltage across the zener diode D1; rx is the resistance value of the adjustable resistor; VCC1 is the supply voltage value.
By utilizing the 'virtual short' characteristic of the operational amplifier, the in-phase voltage is equal to the reverse-phase voltage, and the reverse-phase input end is connected with the sampling resistor Rf to the power supply VCC1. The calculation formula of the output current of the constant current source is as follows: i= (VCC 1-VA)/Rf, (2) where VA is the voltage value of the non-inverting input terminal and Rf is the resistance value of the sampling resistor.
Current transfer ratio ctr=i/IF, (3) where IF is the input current of the optocoupler.
By combining the above (1), 2 and 3), the adjustable constant current source can be adjusted through the variable resistor Rx, so that the adjustment of the optocoupler CTR is realized, and the requirement of a specific CTR is met.
Referring to fig. 6, according to a second embodiment, an optocoupler adjustable circuit is provided, and a third embodiment of the invention further provides an optocoupler adjustable device, which includes a control circuit board, and the control circuit board sets a CTR adjustable optocoupler circuit to obtain different CTR values.
It should be noted that, in the second embodiment of the present invention, the adjustment achieved by using the variable resistor Rx is close to the constant current, and the modification of the second embodiment uses a special circuit to achieve the constant current with higher precision, both of which can meet the requirement of CTR adjustment.
Compared with the prior art, the invention has the beneficial effects that:
1. a CTR adjustable method, an optocoupler circuit and a device control the base input current of the optocoupler to obtain different CTR values by changing the resistance value of an adjustable resistor or a bias circuit in an adjustable constant current source module, thereby realizing the adjustment of the CTR of the optocoupler and meeting the requirements of specific CTR.
2. The bias circuit module can provide stable voltage input for the adjustable constant current source module; the operational amplifier circuit module forms a negative feedback circuit; the amplifying circuit module provides proper current for the circuit; the feedback circuit module feeds back the load current in real time through the sampling resistor; therefore, stable output and control adjustment of the constant current source circuit module are ensured, and the optocoupler CTR is stable and adjustable.
The foregoing is merely illustrative of the present invention and is not to be construed as limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; all equivalent structures or equivalent flow changes made by the specification and the attached drawings of the invention or directly or indirectly applied to other related technical fields are included in the protection scope of the invention.
Claims (8)
1. The utility model provides a CTR adjustable opto-coupler circuit, includes opto-coupler, its characterized in that: the output end of the optocoupler is provided with an adjustable constant current circuit, and one end of the adjustable constant current circuit is electrically connected with a base pin of the optocoupler;
the adjustable constant current circuit comprises an adjustable constant current source module, and one end of the adjustable constant current source module is electrically connected with a base pin of the optocoupler;
the adjustable constant current source module comprises a biasing circuit module, an operational amplifier circuit module, an amplifying circuit module and a feedback circuit module, wherein the biasing circuit module is electrically connected with the operational amplifier circuit module, the operational amplifier circuit module is electrically connected with the amplifying circuit module, the amplifying circuit module is electrically connected with the feedback circuit module, and the amplifying circuit module is electrically connected with a base pin of the optocoupler.
2. The CTR-tunable optocoupler circuit of claim 1, wherein: the adjustable constant current circuit comprises an adjustable resistor, one end of the adjustable resistor is electrically connected with the base pin of the optocoupler, and the other end of the adjustable resistor is electrically connected with the collector pin of the optocoupler.
3. The CTR-tunable optocoupler circuit of claim 2, wherein: the bias circuit module comprises an adjustable resistor; the operational amplifier circuit module comprises an operational amplifier; the amplifying circuit module comprises a transistor; the feedback circuit module comprises a sampling resistor; the adjustable resistor is characterized in that the adjusting end of the adjustable resistor is electrically connected with the positive input end of the operational amplifier, the negative input end of the operational amplifier and the emitter of the transistor are electrically connected with one end of the sampling resistor, the output end of the operational amplifier is electrically connected with the base electrode of the transistor, and one end of the collector of the transistor is electrically connected with the base electrode pin of the optocoupler.
4. The CTR-tunable optocoupler circuit of claim 3, wherein: the bias circuit module further comprises a first resistor and a voltage stabilizing diode, one end of the positive electrode of the voltage stabilizing diode is electrically connected with one end of the first resistor and one end of the adjustable resistor, a power pin of the operational amplifier, the negative electrode of the voltage stabilizing diode, the other end of the sampling resistor and the other end of the adjustable resistor are all connected with a power supply, and a ground pin of the operational amplifier and the other end of the first resistor are all grounded.
5. A method for adjusting a CTR of an optocoupler of a CTR-adjustable optocoupler circuit as claimed in any one of claims 1 to 4, the optocoupler being an input optocoupler with a base on one side of an output terminal, the method comprising: the method comprises the following steps:
providing a stable working current at the input end of the optocoupler;
an adjustable constant current circuit is arranged at the output end of the optocoupler;
and controlling the base input current of the optocoupler through the adjustable constant current circuit to obtain different CTR values.
6. The method of adjusting the optocoupler CTR of claim 5, wherein: the adjustable constant current circuit comprises any mode of setting an adjustable resistor or an adjustable constant current source module.
7. The method of adjusting the optocoupler CTR of claim 6, wherein: and the base input current of the optocoupler is controlled to obtain different CTR values by changing any mode of the resistance value of the adjustable resistor or the bias circuit in the adjustable constant current source module.
8. An optical coupler adjustable device is characterized in that: the device comprises a control circuit board provided with a CTR-adjustable optocoupler circuit as claimed in any one of claims 1-4 for obtaining different CTR values.
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| CN202110501114.4A CN113242036B (en) | 2021-05-08 | 2021-05-08 | CTR (control line) adjustable method, optocoupler circuit and device |
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| CN202110501114.4A CN113242036B (en) | 2021-05-08 | 2021-05-08 | CTR (control line) adjustable method, optocoupler circuit and device |
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| CN113242036B true CN113242036B (en) | 2023-07-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175941A (en) * | 2011-01-31 | 2011-09-07 | 广州金升阳科技有限公司 | Optical coupler measurement device capable of directly displaying current transfer ratio |
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| CN2627738Y (en) * | 2003-01-23 | 2004-07-21 | 张庆 | Input circuit of solid state relay |
| CN105633776B (en) * | 2015-12-15 | 2019-04-30 | 苏州旭创科技有限公司 | Driving device, driving method and the high-speed optical module of laser |
| CN211981849U (en) * | 2020-03-16 | 2020-11-20 | 南京飞赫电器有限公司 | Photoelectric coupler signal regulating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102175941A (en) * | 2011-01-31 | 2011-09-07 | 广州金升阳科技有限公司 | Optical coupler measurement device capable of directly displaying current transfer ratio |
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