CN107015080B - Detection device for filter capacitor in PLC module - Google Patents
Detection device for filter capacitor in PLC module Download PDFInfo
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- CN107015080B CN107015080B CN201710236940.4A CN201710236940A CN107015080B CN 107015080 B CN107015080 B CN 107015080B CN 201710236940 A CN201710236940 A CN 201710236940A CN 107015080 B CN107015080 B CN 107015080B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present disclosure relates to a detection device for a filter capacitor in a PLC module. The detection device includes: the detection interface is used for being connected with a port of the PLC module and connecting the filter capacitor into the detection device; the signal amplifying circuit is connected with the detection interface and is used for amplifying the voltage signal input at the detection interface; the detection circuit is connected with the signal amplification circuit and is used for detecting the amplified voltage signal; and the output circuit is connected with the detection circuit and is used for outputting an alarm signal when the detected voltage signal fluctuates and the amplitude of the fluctuation is larger than a preset voltage threshold value. Therefore, the PLC module is not required to be detached from the system, the filter capacitor is not required to be detached from the PLC module, the detection device can be directly connected with a port of the PLC module for detection, the detection time is saved, the workload is reduced, and the damage of elements caused by detachment is avoided.
Description
Technical Field
The disclosure relates to the field of PLC control, and in particular, to a detection device for a filter capacitor in a PLC module.
Background
Currently, programmable logic controller (Programmable Logic Controller, PLC) modules (remote modules) are used in a large number of manufacturing enterprise control systems for control. Because the PLC module works in a high-temperature and vibration environment for a long time, part of elements in the PLC module can age, the performance is reduced, and the shutdown fault can occur. Among them, the failure of the PLC module is often the cause of degradation or damage of the filter capacitor (mostly the electrolytic capacitor) in the isolated power supply inside the PLC module. The performance of the filter capacitor in the isolation power supply of the PLC module can be detected regularly, and the normal operation of the PLC module is ensured.
The filter capacitor in the isolated power supply of the PLC module mainly comprises a power supply filter capacitor and a communication filter capacitor. The detection of the filter capacitor in the isolated power supply of the PLC module is conventionally carried out by detaching the PLC module from the production line, detaching the internal filter capacitor from the PLC module and detecting by using an RLC meter or a digital bridge.
Disclosure of Invention
The purpose of the present disclosure is to provide a simple and efficient detection device for a filter capacitor in a PLC module.
In order to achieve the above object, the present disclosure provides a detection device for a filter capacitor in a PLC module. The detection device includes: the detection interface is used for being connected with a port of the PLC module and connecting the filter capacitor into the detection device; the signal amplifying circuit is connected with the detection interface and is used for amplifying the voltage signal input at the detection interface; the detection circuit is connected with the signal amplification circuit and is used for detecting the amplified voltage signal; and the output circuit is connected with the detection circuit and is used for outputting an alarm signal when the detected voltage signal fluctuates and the amplitude of the fluctuation is larger than a preset voltage threshold value.
Optionally, the detection device further includes a power supply circuit, the power supply circuit includes a first voltage converter, a switch, and a fuse, the first voltage converter includes an input end, an output end, and a ground end, where the positive input end of the power supply circuit is connected to one end of the switch through the fuse, the other end of the switch is connected to the input end of the first voltage converter, the output end of the first voltage converter is the positive output end of the power supply circuit, and the negative input end of the power supply circuit and the ground end of the first voltage converter are respectively grounded.
Optionally, the detection device further includes a power indication circuit, the power indication circuit includes a ninth resistor and a first light emitting diode, an anode of the first light emitting diode is connected to an anode output end of the power supply circuit through the ninth resistor, and a cathode of the first light emitting diode is grounded.
Optionally, the filter capacitor includes a power filter capacitor, the detection interface includes a first detection interface and a first resistor, an anode of the first detection interface is connected with an anode output end of the power circuit through the first resistor and is connected with the signal amplifying circuit, and a cathode of the first detection interface is grounded.
Optionally, the filter capacitor includes a communication filter capacitor, the detection interface includes a second detection interface, an anode of the second detection interface is connected with the signal amplifying circuit, and a cathode of the second detection interface is grounded.
Optionally, the signal amplifying circuit includes a first operational amplifier, a second voltage converter, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the second voltage converter includes an input end, an output end and a ground end, and the sixth resistor is a variable resistor.
Wherein the input end of the second voltage converter is connected with the output end of the first voltage converter and is grounded through the first capacitor, the output end of the second voltage converter is grounded through the fourth capacitor, the inverting input end of the first operational amplifier is sequentially connected with the detection interface through the second resistor and the second capacitor which are connected in series, or is sequentially connected with the detection interface through the third resistor and the third capacitor which are connected in series, the non-inverting input end of the first operational amplifier is connected with the output end of the second voltage converter and is grounded through the fourth capacitor, the output end of the first operational amplifier is connected with one fixed end of the sixth resistor through the fifth resistor, the other fixed end of the sixth resistor is connected with the inverting input end of the second operational amplifier, the output end of the first operational amplifier is connected with the inverting input end of the first operational amplifier through the fourth resistor, the output end of the second operational amplifier is connected with the inverting input end of the second operational amplifier through the seventh resistor, and is connected with the sliding end of the sixth resistor through the seventh resistor, the non-inverting input end of the second operational amplifier is connected with the output end of the second voltage converter, and is grounded through the eighth resistor, the positive power end of the first operational amplifier and the positive power end of the second operational amplifier are respectively connected with the positive output end of the power circuit, the negative power end of the first operational amplifier and the negative power end of the second operational amplifier are respectively grounded, the output end of the second operational amplifier is the positive output end of the signal amplifying circuit, the output end of the second operational amplifier is the negative electrode output end of the signal amplifying circuit.
Optionally, the detection circuit includes a diode and a fifth capacitor, where an anode of the diode is connected to an output end of the positive electrode of the signal amplifying circuit, a cathode of the diode is connected to one end of the fifth capacitor, another end of the fifth capacitor is connected to an output end of the negative electrode of the signal amplifying circuit, and two ends of the fifth capacitor are output ends of the detection circuit.
Optionally, the output circuit includes: the driving module is used for generating a driving signal when the voltage signal output by the detection circuit fluctuates and the amplitude of the fluctuation is larger than the preset voltage threshold value; and the output module is connected with the driving module and is used for outputting the alarm signal according to the driving signal.
Optionally, the driving module includes a photo coupler, a tenth resistor, an eleventh resistor, a twelfth resistor, a sixth capacitor and a triode, where an anode input end of the photo coupler is connected to an anode output end of the detection circuit through the tenth resistor, a cathode input end of the photo coupler is connected to a cathode output end of the detection circuit and is grounded through the sixth capacitor, an anode output end of the photo coupler is connected to an anode output end of the power supply circuit, a cathode output end of the photo coupler is connected to a base electrode of the triode through the eleventh resistor, a base electrode of the triode is connected to a ground wire through the twelfth resistor, an emitter of the triode is grounded, and a collector of the triode is an output end of the driving module.
Optionally, the output module comprises an audio output sub-module and/or a light emitting output sub-module, and the audio output sub-module comprises a thirteenth resistor, a seventh capacitor and a buzzer, wherein one end of the seventh capacitor and the buzzer after being connected in parallel is connected with the positive output end of the power supply circuit through the thirteenth resistor, and the other end of the seventh capacitor and the buzzer is connected with the output end of the driving module; the light-emitting output submodule comprises a fourteenth resistor and a second light-emitting diode, wherein the anode of the second light-emitting diode is connected with the positive output end of the power supply circuit through the fourteenth resistor, and the cathode of the second light-emitting diode is connected with the output end of the driving module.
Through the detection device provided by the technical scheme, the filter capacitor to be detected can be directly connected with the port of the PLC module and connected into the detection device, and the fluctuation signal of the voltage is detected through the circuit in the detection device, so that the performance of the filter capacitor can be directly checked from the filtering effect. When the detection device provided by the disclosure detects the filter capacitor in the PLC module, the PLC module is not required to be detached from the system, and the filter capacitor is not required to be detached from the PLC module, so that the detection device can be directly connected with a port of the PLC module for detection, the detection time is saved, the workload is reduced, and the damage of elements caused by detachment is avoided.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a block diagram of a detection apparatus provided in an exemplary embodiment;
FIG. 2 is a schematic diagram of an internal power circuit of a PLC module provided in an exemplary embodiment;
fig. 3 is a circuit schematic diagram of a detection device according to an exemplary embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In view of the above, at present, for detecting the performance of the filter capacitor in the isolated power supply of the PLC module, the PLC module is usually detached from the production line, and then the filter capacitor to be detected in the PLC module is detached, and is detected by using the RLC meter or the digital bridge. Such a detection method has problems of long time and large workload. It is a difficult matter to make a comprehensive screening of internal capacitance aging at a manufacturing enterprise using a large number of PLC modules. And the cost is very high, and the normal operation of the production line can be influenced.
The filter capacitor in the isolated power supply of the PLC module mainly comprises a power supply filter capacitor and a communication filter capacitor. As long as one of the two filter capacitors is damaged, the whole PLC module can not work normally. In particular, the damage of the latter can cause the alarm of the whole communication network, which leads to the paralysis of the PLC system and the difficulty of confirming the fault point. The detection device provided by the present disclosure can detect the performance of the filter capacitor in its isolated power supply through the port directly connected to the PLC module, without disassembling the PLC module and the filter capacitor, as described in detail below.
The present disclosure provides a detection device for a filter capacitor in a PLC module, and fig. 1 is a block diagram of a detection device according to an exemplary embodiment. As shown in fig. 1, the detection apparatus 10 may include a detection interface 11, a signal amplification circuit 12, a detection circuit 13, and an output circuit 14.
The detection interface 11 is used for being connected with a port of the PLC module, and connecting the filter capacitor to the detection device 10. The signal amplifying circuit 12 is connected to the detection interface 11, and is configured to amplify a voltage signal input at the detection interface 11. The detection circuit 13 is connected to the signal amplification circuit 12, and detects the amplified voltage signal. The output circuit 14 is connected to the detection circuit 13, and outputs an alarm signal when the detected voltage signal fluctuates and the amplitude of the fluctuation is greater than a predetermined voltage threshold.
Specifically, the ports of the PLC module may include a power port and a communication port. When the power supply filter capacitor is detected, the detection device can be connected to a power supply port of the PLC module, and the power supply filter capacitor is connected to the detection device, so that current fluctuation of the power supply of the PLC module is detected; when the communication filter capacitor is detected, the detection device can be connected to a communication port (for example, a port of a Profibus joint) of the PLC module, and the communication filter capacitor is connected to the detection device, so that voltage fluctuation of a communication power supply of the PLC module is detected. The detection interface 11 may be configured to match the port of the PLC module to facilitate connection. After the detection device 10 is connected to the port of the PLC module, the detected minute fluctuation voltage is subjected to signal amplification, detection, comparison, and the like to determine whether the filter capacitor to be detected is aged (performance is degraded), and when it is determined that the filter capacitor to be detected is aged, the filter capacitor is presented through an output circuit.
Taking the SMART I/O of the PLC module of LG as an example, fig. 2 is a schematic diagram of an internal power supply circuit of the PLC module according to an exemplary embodiment. As shown in fig. 2, the power supply filter capacitor C is detected a In this case, the detection interface 11 may be connected to a positive (24V) and negative (0V) power supply interface, i.e. a power supply filter capacitor C a Is provided. Communication filter capacitor C to be detected therein b The detection interface 11 can be connected to pins 5 and 6 of the Profibus connector, i.e. the communication filter capacitor C b At both ends, the filter capacitor to be detected is connected to the detection device 10.
The electric signal input to the detection device 10 may output an alarm signal indicating degradation or damage of the filter capacitor if the voltage signal fluctuates and the amplitude of the fluctuation is greater than a predetermined voltage threshold value in consideration of the effect of filtering by the filter capacitor under test during the processing of the electric signal by the circuit thereof. Wherein the predetermined voltage threshold may be empirically or experimentally derived.
Therefore, the PLC module is not required to be detached from the system, the filter capacitor is not required to be detached from the PLC module, and the detection device can be used for detecting through being directly connected with a port of the PLC module, so that a fault point can be directly confirmed, the detection time is saved, the workload is reduced, and the damage of elements caused by detachment is avoided. When the production is stopped, the detection device is used for screening the PLC module, so that the PLC system fault caused by the damage of the filter capacitor in the isolated power supply of the PLC module can be avoided.
The detection device can be provided with a power circuit and can be used as a power supply by using a storage battery, so that the detection device can be made into a relatively portable instrument, and the detection device is convenient for workers to carry. The charging module can be further arranged to charge the storage battery, so that the convenience of the detection device is further enhanced.
Fig. 3 is a circuit schematic diagram of a detection device according to an exemplary embodiment. As shown in fig. 3, the detection device 10 may include a power circuit 15. The power supply circuit 15 may include a first voltage converter U1, a switch S, and a fuse F. The first voltage converter U1 includes an input terminal Vin, an output terminal Vout, and a ground terminal GND. The positive input terminal vin+ of the power circuit 15 is connected to one end of the switch S through the fuse F, the other end of the switch S is connected to the input terminal Vin of the first voltage converter U1, and the output terminal Vout of the first voltage converter U1 is the positive output terminal of the power circuit 15. The negative input terminal Vin-of the power circuit 15 and the ground terminal GND of the first voltage converter U1 are grounded, respectively.
In this embodiment, the power supply circuit 15 may be arranged to be powered by placing a dry cell (e.g., 12V) between the positive input vin+ and the negative input Vin-. The power supply circuit 15 may further include a charging module 151 connected in parallel with the dry battery. The first voltage converter U1 may be, for example, a 12V-24V converted DC-DC converter, and the detection device 10 may be powered by a 12V battery.
To indicate whether the power supply of the detection apparatus 10 is normally powered, the detection apparatus 10 may further include a power supply indication circuit 16. As shown in fig. 3, the power indication circuit 16 may include a ninth resistor R9 and a first light emitting diode D1. The anode of the first light emitting diode D1 is connected to the positive output end of the power circuit 15 through the ninth resistor R9, and the cathode of the first light emitting diode D1 is grounded.
Thus, when the current output is provided at the positive output terminal of the power circuit 15, the first light emitting diode D1 emits light, and the worker can know whether the power supply is operating normally from the power supply indicator lamp provided in the instrument housing.
In one embodiment, the detection device 10 may detect the power filter capacitor, that is, the filter capacitor may include the power filter capacitor. In this embodiment, the detection interface 11 may include a first detection interface (including the positive electrode 111 of the first detection interface and the negative electrode 112 of the first detection interface) and a first resistor R1. The positive electrode 111 of the first detection interface is connected to the positive electrode output terminal of the power supply circuit 15 through the first resistor R1, and is connected to the signal amplifying circuit 12, and the negative electrode 112 of the first detection interface is grounded. The connection of the first detection interface to the PLC module may be, for example, via a stylus of a multimeter. That is, the positive electrode 111 of the first detection interface and the positive electrode power supply port (e.g., 24V port in fig. 2) of the PLC module may be connected with two ends of one stylus, and the negative electrode 112 of the first detection interface and the negative electrode power supply port (e.g., 0V port in fig. 2) of the PLC module may be connected with two ends of the other stylus. At this time, if the output circuit 14 outputs an alarm signal, it indicates that there is a fluctuation in the voltage signal, and the amplitude of the fluctuation is greater than a predetermined voltage threshold, the power supply filter capacitance has been damaged.
The first resistor R1 is a limiting resistor, can prevent the detection meter pen from being short-circuited, and is used as a sampling resistor of the input current of the PLC module to convert the fluctuation of the input current of the PLC module into voltage fluctuation.
When the capacity of the power supply filter capacitor is reduced, the performance is poor or the loss factor is increased, the current fluctuation generated by the switch circuit cannot be filtered, the current fluctuation can be represented by the power supply input end, and the voltage fluctuation can be detected from the output end of the power supply circuit 15 of the detection device 10 when the detection device 10 supplies power to the PLC module.
In an embodiment, the detection device 10 may detect the communication filter capacitor, that is, the filter capacitor may include the communication filter capacitor. In this embodiment, the detection interface 11 may include a second detection interface (including a positive electrode 113 of the second detection interface and a negative electrode 114 of the second detection interface). The positive electrode 113 of the second detection interface is connected to the signal amplifying circuit 12, and the negative electrode 114 of the second detection interface is grounded. The connection of the second detection interface to the PLC module may be, for example, via a Profibus connector and a Profibus flexible cable with shielding. Returning to FIG. 2, communication filter capacitor C in SMART I/O b Is connected to the 5 and 6 pins in its communication port (Profibus connector), respectively. If the communication filter capacitor C of the internal power supply in the SMART I/O is to be used b The positive electrode 113 and the negative electrode 114 of the second detection interface may be connected to pins 5 and 6 in the Profibus connector via Profibus flexible cables, respectively, to facilitate connection with the Profibus connector in the SMART I/O. At this time, if the output circuit 14 outputs an alarm signal, the communication filter capacitor C of the internal power supply in the SMART I/O is indicated b Has been damaged.
When the communication filter capacitor C b When the capacity is reduced, the performance is deteriorated, or the loss factor is increased, a filtering failure is caused, and the voltage fluctuation of the output power supply is increased. The output circuit 14 outputs an alarm signal when the voltage fluctuation reaches a predetermined voltage threshold.
Returning to fig. 3, in an embodiment, the signal amplifying circuit 12 may include a first operational amplifier Y1, a second operational amplifier Y2, a second voltage converter U2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The second voltage converter U2 may include an input terminal Vin, an output terminal Vout, and a ground terminal GND, and the sixth resistor R6 is a variable resistor.
The input end of the second voltage converter U2 is connected to the output end of the first voltage converter U1 and grounded through the first capacitor C1, and the output end of the second voltage converter U2 is grounded through the fourth capacitor C4. The inverting input terminal of the first operational amplifier Y1 is connected to the detection interface (the positive electrode 111 of the first detection interface) through the second resistor R2 and the second capacitor C2 which are connected in series, or is connected to the detection interface (the positive electrode 113 of the second detection interface) through the third resistor R3 and the third capacitor C3 which are connected in series. The non-inverting input end of the first operational amplifier Y1 is connected with the output end of the second voltage converter U2 and grounded through a fourth capacitor C4. The output end of the first operational amplifier Y1 is connected with one fixed end of a sixth resistor R6 through a fifth resistor R5, the other fixed end of the sixth resistor R6 is connected with the inverting input end of the second operational amplifier Y2, and the output end of the first operational amplifier Y1 is connected with the inverting input end of the first operational amplifier Y1 through a fourth resistor R4. The output end of the second operational amplifier Y2 is connected with the inverting input end of the second operational amplifier Y2 through a seventh resistor R7, and is connected with the sliding end of a sixth resistor R6 through the seventh resistor R7. The non-inverting input end of the second operational amplifier Y2 is connected with the output end of the second voltage converter U2 and grounded through an eighth resistor R8. The positive power supply end of the first operational amplifier Y1 and the positive power supply end of the second operational amplifier Y2 are respectively connected with the positive output end of the power supply circuit 15, the negative power supply end of the first operational amplifier Y1 and the negative power supply end of the second operational amplifier Y2 are respectively grounded, the output end of the second operational amplifier Y2 is the positive output end of the signal amplifying circuit 12, and the output end of the second operational amplifier Y2 is the negative output end of the signal amplifying circuit 12.
The first operational amplifier Y1, the second capacitor C2, the third capacitor C3, the second resistor R2, the third resistor R3, and the fourth resistor R4 form a first-stage reverse proportional amplifying circuit, and meanwhile, the second capacitor C2, the second resistor R2, the third capacitor C3, and the third resistor R3 are used as input first-stage high-pass filters to prevent low-frequency interference. The second operational amplifier Y2, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 form a second-stage reverse proportional amplifying circuit, and the sixth resistor R6 is used for sensitivity adjustment.
The second voltage converter U2 may be a three-terminal regulator LM7812. The first and second operational amplifiers Y1 and Y2 may be LF353. The first capacitor C1 and the fourth capacitor C4 may be electrolytic capacitors.
In an embodiment, the detection circuit 13 may include a diode D and a fifth capacitor C5. The anode of the diode D is connected with the positive output end of the signal amplifying circuit 12, the cathode of the diode D is connected with one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected with the negative output end of the signal amplifying circuit 12, and the two ends of the fifth capacitor C5 are the output ends of the detection circuit 13.
In an embodiment, the output circuit 14 may include a driving module 141 and an output module 142.
The driving module 141 may be configured to generate the driving signal when the voltage signal output from the detection circuit 13 fluctuates and the amplitude of the fluctuation is greater than a predetermined voltage threshold. The output module 142 is connected to the driving module 141, and is configured to output an alarm signal according to the driving signal.
In the embodiment shown in fig. 3, the driving module 141 may include a photo coupler U3, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a sixth capacitor C6, and a transistor Q. The positive input end of the photo coupler U3 is connected to the positive output end of the detection circuit 13 through a tenth resistor R10, and the negative input end of the photo coupler U3 is connected to the negative output end of the detection circuit 13 and is grounded through a sixth capacitor C6. The positive output end of the photoelectric coupler U3 is connected with the positive output end of the power circuit 15, the negative output end of the photoelectric coupler U3 is connected with the base electrode of the triode Q through an eleventh resistor R11, the base electrode of the triode Q is grounded through a twelfth resistor R12, the emitter electrode of the triode Q is grounded, and the collector electrode of the triode Q is the output end of the driving module 141.
The photo coupler U3 may be, for example, a PC817. Transistor Q may be TIP41, for example. The signal output from the detection circuit 13 is transmitted to the photo coupler U3, and when the amplitude of the voltage fluctuation is greater than a predetermined voltage threshold, the signal is transmitted to the output module 142 through the photo coupler U3 and the transistor Q.
In an embodiment, the output module 142 may include an audio output sub-module and/or a light emitting output sub-module.
In the embodiment shown in fig. 3, the audio output sub-module may include a thirteenth resistor R13, a seventh capacitor C7, and a buzzer U4. One end of the seventh capacitor C7 and the buzzer U4 after being connected in parallel is connected to the positive output end of the power circuit 15 through a thirteenth resistor R13, and the other end is connected to the output end of the driving module 141.
The light emitting output sub-module may include a fourteenth resistor R14 and a second light emitting diode D2. The anode of the second light emitting diode D2 is connected to the positive output end of the power circuit 15 through the fourteenth resistor R14, and the cathode of the second light emitting diode D2 is connected to the output end of the driving module 141. The embodiment of fig. 3 can prompt by both lighting and buzzing.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (7)
1. A detection device for a filter capacitor in a PLC module, the detection device comprising:
the detection interface is used for being connected with a port of the PLC module and connecting the filter capacitor into the detection device;
the signal amplifying circuit is connected with the detection interface and is used for amplifying the voltage signal input at the detection interface;
the detection circuit is connected with the signal amplification circuit and is used for detecting the amplified voltage signal;
the output circuit is connected with the detection circuit and is used for outputting an alarm signal when the detected voltage signal fluctuates and the amplitude of the fluctuation is larger than a preset voltage threshold value;
the detection device further comprises a power supply circuit, the power supply circuit comprises a first voltage converter, a switch and a fuse, the first voltage converter comprises an input end, an output end and a grounding end, wherein the positive electrode input end of the power supply circuit is connected with one end of the switch through the fuse, the other end of the switch is connected with the input end of the first voltage converter, the output end of the first voltage converter is the positive electrode output end of the power supply circuit, and the negative electrode input end of the power supply circuit and the grounding end of the first voltage converter are respectively grounded;
the signal amplifying circuit comprises a first operational amplifier, a second voltage converter, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein the second voltage converter comprises an input end, an output end and a grounding end, and the sixth resistor is a variable resistor;
wherein the input end of the second voltage converter is connected with the output end of the first voltage converter and is grounded through the first capacitor, the output end of the second voltage converter is grounded through the fourth capacitor, the inverting input end of the first operational amplifier is sequentially connected with the detection interface through the second resistor and the second capacitor which are connected in series, or is sequentially connected with the detection interface through the third resistor and the third capacitor which are connected in series, the non-inverting input end of the first operational amplifier is connected with the output end of the second voltage converter and is grounded through the fourth capacitor, the output end of the first operational amplifier is connected with one fixed end of the sixth resistor through the fifth resistor, the other fixed end of the sixth resistor is connected with the inverting input end of the second operational amplifier, the output end of the first operational amplifier is connected with the inverting input end of the first operational amplifier through the fourth resistor, the output end of the second operational amplifier is connected with the inverting input end of the second operational amplifier through the seventh resistor, and is connected with the sliding end of the sixth resistor through the seventh resistor, the non-inverting input end of the second operational amplifier is connected with the output end of the second voltage converter, and is grounded through the eighth resistor, the positive power end of the first operational amplifier and the positive power end of the second operational amplifier are respectively connected with the positive output end of the power circuit, the negative power end of the first operational amplifier and the negative power end of the second operational amplifier are respectively grounded, the output end of the second operational amplifier is the positive output end of the signal amplifying circuit, the homodromous input end of the second operational amplifier is the negative electrode output end of the signal amplifying circuit;
the detection circuit comprises a diode and a fifth capacitor, wherein the anode of the diode is connected with the positive output end of the signal amplification circuit, the cathode of the diode is connected with one end of the fifth capacitor to serve as the positive output end of the detection circuit, and the other end of the fifth capacitor is connected with the negative output end of the signal amplification circuit to serve as the negative output end of the detection circuit.
2. The detection device according to claim 1, further comprising a power indication circuit, wherein the power indication circuit comprises a ninth resistor and a first light emitting diode, an anode of the first light emitting diode is connected to an output end of a positive electrode of the power supply circuit through the ninth resistor, and a cathode of the first light emitting diode is grounded.
3. The detection device according to claim 1, wherein the filter capacitor comprises a power filter capacitor, the detection interface comprises a first detection interface and a first resistor, the positive electrode of the first detection interface is connected with the positive electrode output end of the power circuit through the first resistor and is connected with the signal amplifying circuit, and the negative electrode of the first detection interface is grounded.
4. The device according to claim 1, wherein the filter capacitor comprises a communication filter capacitor, the detection interface comprises a second detection interface, a positive electrode of the second detection interface is connected with the signal amplifying circuit, and a negative electrode of the second detection interface is grounded.
5. The detection apparatus according to claim 1, wherein the output circuit includes:
the driving module is used for generating a driving signal when the voltage signal output by the detection circuit fluctuates and the amplitude of the fluctuation is larger than the preset voltage threshold value;
and the output module is connected with the driving module and is used for outputting the alarm signal according to the driving signal.
6. The detection device according to claim 5, wherein the driving module comprises a photo coupler, a tenth resistor, an eleventh resistor, a twelfth resistor, a sixth capacitor and a triode, wherein a positive input end of the photo coupler is connected to a positive output end of the detection circuit through the tenth resistor, a negative input end of the photo coupler is connected to a negative output end of the detection circuit and is grounded through the sixth capacitor, a positive output end of the photo coupler is connected to a positive output end of the power supply circuit, a negative output end of the photo coupler is connected to a base electrode of the triode through the eleventh resistor, a base electrode of the triode is grounded through the twelfth resistor, an emitter electrode of the triode is grounded, and a collector electrode of the triode is an output end of the driving module.
7. The detection device according to claim 6, wherein the output module comprises an audio output sub-module and/or a light emitting output sub-module,
the audio output submodule comprises a thirteenth resistor, a seventh capacitor and a buzzer, wherein one end of the seventh capacitor and one end of the buzzer which are connected in parallel are connected with the positive electrode output end of the power supply circuit through the thirteenth resistor, and the other end of the seventh capacitor and one end of the buzzer are connected with the output end of the driving module;
the light-emitting output submodule comprises a fourteenth resistor and a second light-emitting diode, wherein the anode of the second light-emitting diode is connected with the positive output end of the power supply circuit through the fourteenth resistor, and the cathode of the second light-emitting diode is connected with the output end of the driving module.
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| CN101308597A (en) * | 2008-05-21 | 2008-11-19 | 徐承东 | Capacitor type detection alarm apparatus |
| CN202013389U (en) * | 2011-01-30 | 2011-10-19 | 刘志远 | Detection device for condenser and reactor |
| CN202133704U (en) * | 2011-07-01 | 2012-02-01 | 厦门市老科学技术工作者协会 | Electric AC nano-voltmeter |
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| CN206725670U (en) * | 2017-04-12 | 2017-12-08 | 北京现代汽车有限公司 | Detection means for filter capacitor in PLC module |
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| CN101776707A (en) * | 2009-01-13 | 2010-07-14 | 鸿富锦精密工业（深圳）有限公司 | Current detection device |
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| CN101308597A (en) * | 2008-05-21 | 2008-11-19 | 徐承东 | Capacitor type detection alarm apparatus |
| CN202013389U (en) * | 2011-01-30 | 2011-10-19 | 刘志远 | Detection device for condenser and reactor |
| CN202133704U (en) * | 2011-07-01 | 2012-02-01 | 厦门市老科学技术工作者协会 | Electric AC nano-voltmeter |
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