CN220383045U - Filter circuit for connecting to input end of optocoupler and electronic equipment - Google Patents
Filter circuit for connecting to input end of optocoupler and electronic equipment Download PDFInfo
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- CN220383045U CN220383045U CN202320304409.7U CN202320304409U CN220383045U CN 220383045 U CN220383045 U CN 220383045U CN 202320304409 U CN202320304409 U CN 202320304409U CN 220383045 U CN220383045 U CN 220383045U
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- 239000003990 capacitor Substances 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 6
- 238000002955 isolation Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The application provides a filter circuit and electronic equipment for connecting to an input end of an optocoupler. The filter circuit comprises a differential mode filter circuit and a common mode filter circuit, wherein the differential mode filter circuit is electrically connected with the first input end and the second input end of the optocoupler, and the common mode filter circuit is electrically connected between the second input end and the ground end of the optocoupler. The electronic device comprises the filter circuit. The common mode filter circuit and the differential mode filter circuit are connected to the input end of the optocoupler, so that common mode interference signals and differential mode interference signals can be filtered, compared with the related art, the number of devices can be reduced, the cost is reduced, the area of a plate is reduced, and the optocoupler is suitable for small-size electronic equipment, for example, is more suitable for industrial cameras.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and more particularly, to a filter circuit connected to an input end of an optocoupler and an electronic device.
Background
The optocoupler isolation is to use an optocoupler for isolation. The optocoupler is structured to encapsulate the light emitting diode and the phototransistor. The optocoupler isolation circuit enables no direct electrical connection between the two isolated circuits, and mainly prevents interference caused by the electrical connection, particularly between the low-voltage control circuit and an external high-voltage circuit. In the related art, the shaping circuit and the main control circuit of the rear stage of the optocoupler are used for filtering the high-frequency interference signals, so that a large number of devices are needed, the area of the cloth is large, and the cost is high.
Disclosure of Invention
The application provides a filter circuit and electronic equipment which are low in cost and small in cloth area and are used for being connected to an input end of an optocoupler.
The application provides a filter circuit for being connected to the input of opto-coupler, filter circuit includes differential mode filter circuit and common mode filter circuit, wherein differential mode filter circuit electricity connect in the first input and the second input of opto-coupler, common mode filter circuit electricity connect in between the second input and the ground of opto-coupler.
Optionally, the ground terminal includes a ground terminal, and the output terminal of the optocoupler is connected to the ground terminal; the common mode filter circuit comprises a first filter capacitor, and the first filter capacitor is electrically connected between the second input end of the optocoupler and the grounding end.
Optionally, the ground terminal comprises a casing ground; the common mode filter circuit comprises a first filter capacitor, and the first filter capacitor is electrically connected between the second input end of the optocoupler and the ground of the casing.
Optionally, the differential mode filter circuit includes a filter resistor and a second filter capacitor, where the filter resistor is connected in series to the first input end of the optocoupler, and the second filter capacitor is electrically connected between the first input end and the second input end of the optocoupler.
Optionally, the differential mode filter circuit further includes a voltage dividing resistor, and the voltage dividing resistor is electrically connected between the first input end and the second input end of the optocoupler.
Optionally, the differential mode filter circuit and the common mode filter circuit are integrated on the same circuit board.
The application also provides an electronic device comprising: the filter circuit of any of the above embodiments for connection to an input of an optocoupler.
Optionally, the electronic device includes an industrial camera, the industrial camera includes an optocoupler, and the filter circuit is connected to an input end of the optocoupler.
Optionally, the electronic device includes an industrial camera, the industrial camera includes a camera end and an optocoupler disposed at the camera end, and the filter circuit is integrated into an independent filter component, and the filter component is assembled at a front end of the optocoupler.
Optionally, the industrial camera further comprises a main control board connected to the output end of the optocoupler.
The embodiment of the application provides a filter circuit and electronic equipment for connecting to an input end of an optocoupler. The filter circuit comprises a differential mode filter circuit and a common mode filter circuit, wherein the differential mode filter circuit is electrically connected with the first input end and the second input end of the optocoupler, and the common mode filter circuit is electrically connected between the second input end and the ground end of the optocoupler. The common mode filter circuit and the differential mode filter circuit are connected to the input end of the optocoupler, so that common mode interference signals and differential mode interference signals can be filtered, compared with the related art, the number of devices can be reduced, the cost is reduced, the area of a layout plate is reduced, and the optocoupler is suitable for small-size electronic equipment, for example, is more suitable for industrial cameras.
Drawings
Fig. 1 is a schematic block diagram of one embodiment of a filter circuit for connection to an input of an optocoupler of the present application.
Fig. 2 is a circuit diagram of one embodiment of the filter circuit shown in fig. 1 for connection to an input of an optocoupler.
Fig. 3 is a circuit diagram of another embodiment of the filter circuit shown in fig. 1 for connection to an input of an optocoupler.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the accompanying claims.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. And will be described separately when only "a" is referred to. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The application provides a filter circuit and electronic equipment for connecting to an input end of an optocoupler. The filter circuit comprises a differential mode filter circuit and a common mode filter circuit, wherein the differential mode filter circuit is electrically connected with the first input end and the second input end of the optocoupler, and the common mode filter circuit is electrically connected between the second input end and the ground end of the optocoupler. The electronic device comprises the filter circuit. The common mode filter circuit and the differential mode filter circuit are connected to the input end of the optocoupler, and the common mode interference signal and the differential mode interference signal of the input end of the optocoupler 1 can be filtered, compared with the related art, the number of devices can be reduced, the cost is reduced, the area of a cloth plate is reduced, and the optocoupler is suitable for small-size electronic equipment, for example, is more suitable for industrial cameras.
In the related art, a switching value signal filtering circuit is provided, and the switching value signal filtering circuit is connected with a master control circuit through a filtering circuit, a shaping circuit, a clock circuit and a shaping circuit. The filter circuit mainly filters low-amplitude interference signals, the shaping circuit shapes irregular pulse waveforms of switching value signals into standard pulse square waves and inverts the standard pulse square waves, the inverted switching value signals enter a comparator of the main control circuit to be processed, and finally the main control circuit filters signals with pulse widths smaller than 3ms to achieve the purpose of filtering high-frequency signals. The switching value signal filtering circuit filters high-frequency interference signals through the optical coupling post-stage shaping circuit and the main control circuit, and has the advantages of more required devices, larger cloth area and high cost.
Therefore, the application provides a filter circuit and an electronic device which are low in cost and small in cloth area and are used for being connected to the input end of an optocoupler.
Fig. 1 shows a functional block diagram of an embodiment of a filter circuit 2 for connection to an input of an optocoupler 1 according to the present application. As shown in fig. 1, the filter circuit 2 includes a differential mode filter circuit 21 and a common mode filter circuit 22. The differential mode filter circuit 21 is electrically connected to the first input terminal 11 and the second input terminal 12 of the optocoupler 1. The differential mode filter circuit 21 is used for filtering out differential mode interference signals. The common mode filter circuit 22 is electrically connected between the second input terminal 12 of the optocoupler 1 and the ground terminal 3. The common mode filter circuit 22 is used for filtering the common mode interference signal. The first input end 11 of the optocoupler 1 is an input positive electrode, and the second input end 12 of the optocoupler 1 is an input negative electrode. The common mode filter circuit 22 and the differential mode filter circuit 21 are connected to the input end (the first input end 11 and the second input end 12) of the optocoupler 1 in this way, so that the common mode interference signal and the differential mode interference signal of the input end of the optocoupler 1 can be filtered, compared with the related art, the number of devices can be reduced, the cost can be reduced, the layout area can be reduced, and the optocoupler is suitable for small-size electronic equipment, such as industrial cameras.
Fig. 2 shows a circuit diagram of an embodiment of the filter circuit 2 shown in fig. 1 for connection to an input of an optocoupler 1. In the embodiment shown in fig. 2, the ground 3 includes a ground GND, and the output terminal of the optocoupler 1 is connected to the ground GND. The common mode filter circuit 22 includes a first filter capacitor C1, and the first filter capacitor C1 is electrically connected between the second input terminal 12 of the optocoupler 1 and the ground GND. The first filter capacitor C1 can filter out the common mode interference signal at the input end of the optocoupler 1. In this embodiment, the first filter capacitor C1 is connected to the output end of the rear stage of the optical coupler 1, where the output end may be an on-board system ground of the rear stage of the optical coupler 1, so that a backflow path is provided for the common mode interference signal by connection, and false triggering after the optical coupler 1 receives the common mode interference signal is avoided.
In the embodiment shown in fig. 2, the differential mode filter circuit 21 includes a filter resistor R1 and a second filter capacitor C2, where the filter resistor R1 is connected in series to the first input terminal 11 of the optocoupler 1, and the second filter capacitor C2 is electrically connected between the first input terminal 11 and the second input terminal 12 of the optocoupler 1. The filter resistor R1 and the second filter capacitor C2 form a low-pass filter circuit, and can filter out differential mode interference signals at the input end of the optocoupler 1.
In the embodiment shown in fig. 2, the differential mode filter circuit 21 further includes a voltage dividing resistor R2, and the voltage dividing resistor R2 is electrically connected between the first input terminal 11 and the second input terminal 12 of the optocoupler 1. The voltage dividing resistor R2 plays a role in voltage division, and a part of voltage is reduced on the voltage dividing resistor R2, so that the voltage difference between the first input terminal 11 and the second input terminal 12 of the optocoupler 1 is reduced.
In the embodiment shown in fig. 2, the differential mode filter circuit 21 and the common mode filter circuit 22 are integrated on the same circuit board. The device has the advantages of small number of devices, high integration level and small area of the cloth plate, and is suitable for small-volume electronic equipment.
Fig. 3 is a circuit diagram of another embodiment of the filter circuit 2 shown in fig. 1 for connection to the input of the optocoupler 1. In the embodiment shown in fig. 3, similar to the embodiment shown in fig. 2, the main difference is that the ground 3 comprises a cabinet ground PGND. The first filter capacitor C1 is electrically connected between the second input terminal 12 of the optocoupler 1 and the chassis ground PGND. The casing ground PGND is typically grounded to the ac power supply and is at the same potential as ground. In this embodiment, the first filter capacitor C1 is connected to the chassis ground PGND with the chassis attribute, so that another return path is provided for the common-mode interference signal, and false triggering after the optocoupler 1 receives the common-mode interference signal is avoided.
In other embodiments, the common mode filter circuit 22 may also be an RC filter circuit for filtering the common mode interference signal at the input of the optocoupler 1. And are not limited in this application.
The present application also provides an electronic device comprising a filter circuit 2 for connection to an input of an optocoupler 1 as shown in the embodiments of fig. 1 to 3. In this embodiment, the electronic device may be an industrial camera. Industrial cameras are a key component in machine vision systems, the most essential function of which is to convert optical signals into orderly electrical signals. Compared with the traditional civil camera, the industrial camera has smaller volume, high image stability, high transmission capability, high anti-interference capability and the like.
The industrial camera comprises an optocoupler 1 and the filter circuit 2, wherein the filter circuit 2 is connected to the input end (a first input end 11 and a second input end 12) of the optocoupler 1. The filter circuit 2 is thus connected to or added to the first input 11 and the second input of the optocoupler 1 on the internal circuitry of the industrial camera. In some embodiments, the industrial camera further comprises a main control board 4 connected to the output end of the optocoupler 1. In the embodiment shown in fig. 2 or fig. 3, the output end of the optocoupler 1 further includes a power end, and the main control board 4 is connected to the power end. The power supply terminal of the optocoupler 1 is further connected to an external power supply VCC through a pull-up resistor R3, and the external power supply VCC is used for supplying power to the optocoupler 1. The signal with uncertain voltage end of the optocoupler 1 is clamped at high level of power supply voltage through the pull-up resistor R3, and the pull-up resistor R3 plays a role in current limiting.
The input end (the first input end 11 and the second input end 12) of the optocoupler 1 is connected with the common mode filter circuit 22 and the differential mode filter circuit 21, so that common mode interference signals and differential mode interference signals of the input end of the optocoupler 1 can be filtered, compared with the related art, the number of devices can be reduced, the cost is reduced, the layout area is reduced, and the optocoupler is suitable for small-size electronic equipment, such as industrial cameras. The industrial camera comprises the filter circuit, so that the immunity of the isolation input port of the optical coupler 1 of the industrial camera can be improved, and the problem of false triggering of the isolation input port of the optical coupler 1 caused by interference of other electrical appliances can be solved on site. The isolation input port of the optical coupler 1 refers to a switching value input port for isolating an input circuit from an acquisition circuit in an industrial camera by using the optical coupler 1.
In other embodiments, the industrial camera includes a camera end and an optocoupler 1 disposed at the camera end, and the filter circuit 2 is integrated into a separate filter component, where the filter component is assembled at the front end of the optocoupler 1. In this way, the filter circuit 2 is configured as a separate filter element. When the industrial camera is in use, the filter component can be added at the front end of the optocoupler 1 arranged at the camera end, so that the efficiency of solving the problem on site is improved, and the filter component is convenient to replace or maintain.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the utility model to the precise form disclosed, and any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present utility model are intended to be included within the scope of the present utility model.
Claims (10)
1. The filter circuit is used for being connected to the input end of the optical coupler and is characterized by comprising a differential mode filter circuit and a common mode filter circuit, wherein the differential mode filter circuit is electrically connected to the first input end and the second input end of the optical coupler, and the common mode filter circuit is electrically connected between the second input end and the ground end of the optical coupler.
2. The filter circuit of claim 1, wherein the ground terminal comprises a ground terminal, the output terminal of the optocoupler being connected to the ground terminal; the common mode filter circuit comprises a first filter capacitor, and the first filter capacitor is electrically connected between the second input end of the optocoupler and the grounding end.
3. The filter circuit of claim 1, wherein the ground terminal comprises a chassis ground; the common mode filter circuit comprises a first filter capacitor, and the first filter capacitor is electrically connected between the second input end of the optocoupler and the ground of the casing.
4. A filter circuit according to any one of claims 1 to 3, wherein the differential mode filter circuit comprises a filter resistor and a second filter capacitor, the filter resistor being connected in series with the first input of the optocoupler, the second filter capacitor being electrically connected between the first and second inputs of the optocoupler.
5. A filter circuit according to any one of claims 1 to 3, wherein the differential mode filter circuit further comprises a divider resistor electrically connected between the first and second inputs of the optocoupler.
6. The filter circuit of claim 1, wherein the differential mode filter circuit and the common mode filter circuit are integrated on the same circuit board.
7. An electronic device, comprising: a filter circuit as claimed in any one of claims 1 to 6 for connection to an input of an optocoupler.
8. The electronic device of claim 7, wherein the electronic device comprises an industrial camera comprising an optocoupler, the filter circuit being connected to an input of the optocoupler.
9. The electronic device of claim 7, wherein the electronic device comprises an industrial camera comprising a camera end and an optocoupler disposed at the camera end, the filter circuit being integrated as a separate filter assembly, the filter assembly being assembled at a front end of the optocoupler.
10. The electronic device of claim 8 or 9, wherein the industrial camera further comprises a main control board connected to the output end of the optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320304409.7U CN220383045U (en) | 2023-02-22 | 2023-02-22 | Filter circuit for connecting to input end of optocoupler and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320304409.7U CN220383045U (en) | 2023-02-22 | 2023-02-22 | Filter circuit for connecting to input end of optocoupler and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN220383045U true CN220383045U (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320304409.7U Active CN220383045U (en) | 2023-02-22 | 2023-02-22 | Filter circuit for connecting to input end of optocoupler and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN220383045U (en) |
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- 2023-02-22 CN CN202320304409.7U patent/CN220383045U/en active Active
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