Dry contact input detection circuit and device
By designing a detection circuit compatible with both passive and active dry contacts, and utilizing optocouplers and signal analysis and processing modules, the incompatibility problem of traditional detection devices was solved, enabling the detection of two types of dry contacts with a single circuit, thus saving costs.
Patent Information
- Application Number
- CN202520339677.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-28
AI Technical Summary
Traditional passive dry contact testing devices and active dry contact testing devices are incompatible and need to be purchased separately, which increases costs.
A dry contact input detection circuit was designed, which uses an optocoupler, a first transistor, and a constant current module, combined with a signal analysis and processing module, to simultaneously detect passive and active dry contacts, and to determine circuit abnormalities by the working status of the optocoupler.
This eliminates the need to purchase separate testing devices, enabling the detection of both passive and active dry contacts, thus saving costs.
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Figure CN223955756U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to signal detection technical field especially, relate to a dry contact input detection circuit and device. BACKGROUND
[0002] Dry contact is a kind of switch, has two states of closing and opening. When remote control load, can adopt dry contact to carry out switch control. Before or after using dry contact for a period of time, the loop of dry contact needs to be checked to confirm whether the loop of dry contact is normal.
[0003] Traditional passive dry contact detection device and active dry contact detection device are independent, the device supporting passive dry contact detection cannot be accessed to active dry contact, the device supporting active dry contact detection also cannot be accessed to passive dry contact, otherwise the circuit operation will be abnormal. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a dry contact input detection circuit and device, can be used to detect passive dry contact, also can be used to detect active dry contact, need not to purchase two kinds of detection devices separately, save cost.
[0005] To solve the above technical problem, the utility model adopts the following technical scheme:
[0006] One aspect of the utility model embodiment provides a dry contact input detection circuit, the detection circuit includes: photoelectric coupler, first triode and constant current module, the light emitting side input end of photoelectric coupler and the collector of first triode connect power supply, the light emitting side output end of photoelectric coupler and the emitter of first triode connect second detection end and the input end of constant current module, the output end of constant current module is grounded;First diode, first resistance and second resistance, the anode of first diode connects power supply, the cathode of first diode connects first detection end and one end of first resistance, the other end of first resistance connects the base of first triode and one end of second resistance, the other end of second resistance connects second detection end and the input end of constant current module;Signal analysis processing module, the light receiving side of photoelectric coupler is connected with signal analysis processing module, and signal analysis processing module determines whether the line of dry contact is abnormal according to the working state of photoelectric coupler.
[0007] In some embodiments, the detection circuit further includes a zener diode, the zener diode is arranged between the first diode and the first resistance, the cathode of the first diode is connected to the cathode of the zener diode, and the anode of the zener diode is connected to the base of the first triode and one end of the second resistance through the first resistance.
[0008] In some embodiments, the detection circuit further comprises a second diode, a positive electrode of the second diode is connected to a power supply, and a negative electrode of the second diode is connected to a collector of the first triode and a light-emitting side input end of the photoelectric coupler.
[0009] In some embodiments, the detection circuit further comprises a third resistor and a capacitor, one end of the third resistor and one end of the capacitor are connected to the negative electrode of the first diode, the negative electrode of the voltage stabilizing diode and the first detection end, and the other end of the third resistor and the other end of the capacitor are connected to the second detection end and an input end of the constant current module.
[0010] In some embodiments, the detection circuit further comprises a fourth resistor, the fourth resistor is arranged between the other end of the third resistor and the other end of the capacitor, one end of the fourth resistor is connected to the other end of the third resistor and the second detection end, and the other end of the fourth resistor is connected to the other end of the capacitor and the input end of the constant current module.
[0011] In some embodiments, the constant current module comprises a second triode, a third triode, a fifth resistor and a sixth resistor, a collector of the second triode is an input end of the constant current module, a base of the second triode is connected to one end of the fifth resistor and a collector of the third triode, the other end of the fifth resistor is connected to a power supply, an emitter of the second triode is connected to a base of the third triode and one end of the sixth resistor, an emitter of the third triode and the other end of the sixth resistor are grounded.
[0012] An aspect of an embodiment of the utility model provides a dry contact input detection device, the detection device includes the detection circuit as described above.
[0013] According to the dry contact input detection circuit and device, the first detection end and the second detection end are connected to the passive dry contact, if the passive dry contact is disconnected, the photoelectric coupler is turned on, if the passive dry contact is closed, the photoelectric coupler is cut off, the signal analysis processing module judges whether the dry contact line is normal according to the working state of the photoelectric coupler, the first detection end and the second detection end are connected to the active dry contact, if the active dry contact is disconnected, the photoelectric coupler is turned on, if the active dry contact is closed, the photoelectric coupler is cut off, the signal analysis processing module judges whether the dry contact line is normal according to the working state of the photoelectric coupler, the application can be used for detecting the passive dry contact and the active dry contact, and two detection devices need not be purchased separately, so that the cost is saved.
[0014] It should be understood that the foregoing general description and the following detailed description are only examples, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.
[0016] Figure 1 The schematic diagram of the dry contact input detection circuit according to the embodiment. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.
[0018] The terms "first", "second", "third" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0019] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0020] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of the example implementations to those skilled in the art. The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated into and constitute a part of this specification. Like reference numbers refer to like elements throughout the drawings, and thus continuous numbering of elements over several figures is implied unless the context clearly dictates otherwise.
[0021] The technical solutions of the embodiments of the present application will be briefly described as follows:
[0022] According to some embodiments, such as Figure 1 As shown, this application provides a dry contact input detection circuit, the detection circuit including:
[0023] The optocoupler U, the first transistor Q1, and the constant current module are connected. The light-emitting input terminal of the optocoupler U and the collector of the first transistor Q1 are connected to the power supply. The light-emitting output terminal of the optocoupler U and the emitter of the first transistor Q1 are connected to the second detection terminal and the input terminal of the constant current module. The output terminal of the constant current module is grounded.
[0024] The first diode D1, the first resistor R1, and the second resistor R2 are connected as follows: the positive terminal of the first diode D1 is connected to the power supply, the negative terminal of the first diode D1 is connected to the first detection terminal and one end of the first resistor R1, the other end of the first resistor R1 is connected to the base of the first transistor Q1 and one end of the second resistor R2, and the other end of the second resistor R2 is connected to the second detection terminal and the input terminal of the constant current module.
[0025] The signal analysis and processing module is connected to the light-receiving side of the optocoupler U. The signal analysis and processing module determines whether the dry contact line is abnormal based on the working status of the optocoupler U.
[0026] Specifically, such as Figure 1 As shown, this application applies to three types of dry contacts: active dry contacts, passive resistive dry contacts, and passive dry contacts (with negligible line resistance). Active dry contacts include a first switch S1 connected in series and a DC power supply VDC. Passive resistive dry contacts include a second switch S2 connected in series and a seventh resistor R7. Passive dry contacts (with negligible line resistance) include a third switch S3. For ease of understanding, this application connects active dry contacts, passive resistive dry contacts, and passive dry contacts (with negligible line resistance) in parallel. In some practical applications, one or more of active dry contacts, passive resistive dry contacts, or passive dry contacts (with negligible line resistance) can be connected; this application does not impose any limitations.
[0027] The working principle of the above embodiment is as follows: When the first and second detection terminals are connected to a passive resistive dry contact, if the dry contact is open, the first transistor Q1 is in an amplifying and conducting state, and the optocoupler U is conducting; if the dry contact is closed, the current of the optocoupler U is shunted, and the optocoupler U is cut off; the signal analysis and processing module determines whether the circuit of the dry contact is normal based on the working state of the optocoupler U. If the optocoupler U is cut off when the dry contact is open, or if the optocoupler U is conducting when the dry contact is closed, it indicates that the circuit of the dry contact is abnormal.
[0028] When the first detection end and the second detection end are connected to the passive dry contact (the line resistance is ignored), if the dry contact is disconnected, the first transistor Q1 is in the amplification conduction state, and the optocoupler U is turned on; if the dry contact is closed, the current of the optocoupler U is shunted, and the optocoupler U is turned off; the signal analysis processing module determines whether the line of the dry contact is normal according to the working state of the optocoupler U. If the optocoupler U is turned off when the dry contact is disconnected, or the optocoupler U is turned on when the dry contact is closed, it indicates that the line of the dry contact is abnormal.
[0029] When the first detection end and the second detection end are connected to the passive dry contact (the line resistance is ignored), if the dry contact is disconnected, the first transistor Q1 is in the amplification conduction state, and the optocoupler U is turned on; if the dry contact is closed, the current of the optocoupler U is shunted, and the optocoupler U is turned off; the signal analysis processing module determines whether the line of the dry contact is normal according to the working state of the optocoupler U. If the optocoupler U is turned off when the dry contact is disconnected, or the optocoupler U is turned on when the dry contact is closed, it indicates that the line of the dry contact is abnormal.
[0030] The application can be used for detecting passive dry contacts and active dry contacts, and does not need to purchase two detection devices separately, thereby saving costs.
[0031] The specific connection mode of the detection circuit is shown in the following Figure 1 The preferred embodiments of the present disclosure are further described in detail.
[0032] According to some embodiments, as shown in Figure 1 The detection circuit further includes a zener diode DZ, which is arranged between the first diode D1 and the first resistor R1, and the specific connection mode is as follows,
[0033] The negative electrode of the first diode D1 is connected to the negative electrode of the zener diode DZ, and the positive electrode of the zener diode DZ is connected to the base electrode of the first transistor Q1 and one end of the second resistor R2 through the first resistor R1.
[0034] According to some embodiments, as shown in Figure 1 The detection circuit further includes a second diode D2, and the specific connection mode is as follows,
[0035] The positive electrode of the second diode D2 is connected to the power supply, and the negative electrode of the second diode D2 is connected to the collector electrode of the first transistor Q1 and the light-emitting side input end of the optocoupler U.
[0036] The zener diode DZ is used for stabilizing voltage, the first diode D1 is used for preventing reverse current of the active dry contact, and the second diode D2 is used for voltage division.
[0037] According to some embodiments, asFigure 1 As shown in the figure, the detection circuit further comprises a third resistor R3 and a capacitor C, which are connected as follows,
[0038] One end of the third resistor R3 and one end of the capacitor C are connected to the negative electrode of the first diode D1, the negative electrode of the voltage stabilizing diode DZ and the first detection end, and the other end of the third resistor R3 and the other end of the capacitor C are connected to the second detection end and the input end of the constant current module.
[0039] Among them, the third resistor R3 and the capacitor C are used for filtering.
[0040] According to some embodiments, as Figure 1 As shown in the figure, the detection circuit further comprises a fourth resistor R4, which is arranged between the other end of the third resistor R3 and the other end of the capacitor C, and is connected as follows,
[0041] One end of the fourth resistor R4 is connected to the other end of the third resistor R3 and the second detection end, and the other end of the fourth resistor R4 is connected to the other end of the capacitor C and the input end of the constant current module.
[0042] Among them, the fourth resistor R4 is used for current limiting.
[0043] According to some embodiments, as Figure 1 As shown in the figure, the constant current module comprises a second triode Q2, a third triode Q3, a fifth resistor R5 and a sixth resistor R6, the collector of the second triode Q2 is the input end of the constant current module, and is connected as follows,
[0044] The base of the second triode Q2 is connected to one end of the fifth resistor R5 and the collector of the third triode Q3, the other end of the fifth resistor R5 is connected to the power supply, the emitter of the second triode Q2 is connected to the base of the third triode Q3 and one end of the sixth resistor R6, and the emitter of the third triode Q3 and the other end of the sixth resistor R6 are grounded.
[0045] According to some embodiments, the application provides a dry contact input detection device, which comprises the detection circuit as described above.
[0046] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0047] While the disclosure has been described with reference to several exemplary embodiments, it is understood that the words that have been used are words of description and illustration, rather than words of limitation. As previously mentioned, changes and modifications can be made to the above-described embodiments without departing from the spirit or scope of the disclosure, and it is understood that the above-described embodiments are to be considered exemplary only, and the scope of the disclosure is to be determined by the following claims, and equivalents thereto.
Claims
1. A dry contact input detection circuit, characterized by, The detection circuit comprises: a photoelectric coupler, a first transistor and a constant current module, the light emitting side input end of the photoelectric coupler and the collector of the first transistor are connected to a power supply, the light emitting side output end of the photoelectric coupler and the emitter of the first transistor are connected to a second detection end and the input end of the constant current module, and the output end of the constant current module is grounded; a first diode, a first resistor and a second resistor, the anode of the first diode is connected to a power supply, the cathode of the first diode is connected to a first detection end and one end of the first resistor, the other end of the first resistor is connected to the base of the first transistor and one end of the second resistor, and the other end of the second resistor is connected to a second detection end and the input end of the constant current module; a signal analysis processing module, the light receiving side of the photoelectric coupler is connected to the signal analysis processing module, and the signal analysis processing module determines whether the line of the dry contact point is abnormal according to the working state of the photoelectric coupler.
2. The detection circuit of claim 1, wherein, The detection circuit further comprises a voltage stabilizing diode, the voltage stabilizing diode is arranged between the first diode and the first resistor, the cathode of the first diode is connected to the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is connected to the base of the first transistor and one end of the second resistor through the first resistor.
3. The detection circuit of claim 1, wherein, The detection circuit further comprises a second diode, the anode of the second diode is connected to a power supply, and the cathode of the second diode is connected to the collector of the first transistor and the light emitting side input end of the photoelectric coupler.
4. The detection circuit of claim 2, wherein, The detection circuit further comprises a third resistor and a capacitor, one end of the third resistor and one end of the capacitor are connected to the cathode of the first diode, the cathode of the voltage stabilizing diode and a first detection end, the other end of the third resistor and the other end of the capacitor are connected to a second detection end and the input end of the constant current module.
5. The detection circuit of claim 4, wherein, The detection circuit further comprises a fourth resistor, the fourth resistor is arranged between the other end of the third resistor and the other end of the capacitor, one end of the fourth resistor is connected to the other end of the third resistor and a second detection end, and the other end of the fourth resistor is connected to the other end of the capacitor and the input end of the constant current module.
6. The detection circuit of claim 1, wherein, The constant current module comprises a second transistor, a third transistor, a fifth resistor and a sixth resistor, the collector of the second transistor is used as the input end of the constant current module, the base of the second transistor is connected to one end of the fifth resistor and the collector of the third transistor, the other end of the fifth resistor is connected to a power supply, the emitter of the second transistor is connected to the base of the third transistor and one end of the sixth resistor, and the emitter of the third transistor and the other end of the sixth resistor are grounded.
7. A dry contact input detection device, characterized by The detection device comprises the detection circuit according to any one of claims 1 to 6.