CN218473155U - Current detection circuit and fault diagnosis device for HPLC communication unit - Google Patents
Current detection circuit and fault diagnosis device for HPLC communication unit Download PDFInfo
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- CN218473155U CN218473155U CN202222520367.9U CN202222520367U CN218473155U CN 218473155 U CN218473155 U CN 218473155U CN 202222520367 U CN202222520367 U CN 202222520367U CN 218473155 U CN218473155 U CN 218473155U
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Abstract
The utility model discloses a HPLC communication unit current detection circuit, fault diagnosis device, this detection circuitry is including the resistance sampling module who connects gradually, the module is enlargied to the difference, sampling output module, unusual detection module and output turn-off module, resistance sampling module is connected with the current output end of being surveyed HPLC communication unit, in order to be used for sampling to the current value of HPLC communication unit during operation, sampling resistance parallel connection in difference amplification module and the resistance sampling module, in order to be used for enlargiing the voltage at sampling resistance both ends, the output turn-off module is connected with the power supply end of being surveyed HPLC communication unit, in order to be used for when unusual detection module output unusual indication level for the output turn-off module, output turn-off module control turn-off the power supply of being surveyed HPLC communication unit. The utility model has the advantages of simple structure, with low costs, the sampling precision is high and have automatic fault protection function.
Description
Technical Field
The utility model relates to a HPLC (low pressure power line carrier) communication equipment technical field especially relates to a HPLC communication unit current detection circuit, failure diagnosis device.
Background
The HPLC communication unit is a communication unit for implementing data information transmission by applying a high-speed power line communication technology, and the operation condition of the HPLC communication unit directly affects the reliability of HPLC communication. In the long-time operation process of the HPLC communication unit, due to various external factors, a fault such as circuit aging occurs in the HPLC communication unit, for example, an internal power circuit is abnormal, or a device is damaged, so that power consumption is increased sharply, or even a power short circuit occurs, and therefore, the operating current of the HPLC communication unit needs to be detected to monitor the operation condition of the HPLC communication unit.
For the fault state detection of the HPLC communication unit, currently, special fault detection equipment is usually adopted for field detection, but the special fault monitoring equipment is high in price and complex in structure, particularly, the circuit structure of the current sampling circuit used therein is complex, a plurality of required circuit components are needed, the sampling precision of the simple structure is low, the complexity and the sampling precision of the circuit structure cannot be taken into consideration, the detection requirement on the HPLC communication unit cannot be met, and fault protection cannot be performed in time when the HPLC communication unit fails, so that the operation safety of the HPLC communication unit is affected.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in: technical problem to prior art exists, the utility model provides a simple structure, with low costs, the high HPLC communication unit current detection circuit, the fault diagnosis device who just has automatic fault protection function of sampling precision.
In order to solve the technical problem, the utility model provides a technical scheme does:
the utility model provides a HPLC communication unit current detection circuit, is including the resistance sampling module, difference amplification module, sampling output module, unusual detection module and the output turn-off module that connect gradually, resistance sampling module is connected with the current output end of the HPLC communication unit that is surveyed to be used for sampling the current value of HPLC communication unit during operation, difference amplification module with sampling resistance parallel connection in the resistance sampling module for amplify the voltage at sampling resistance both ends, the output turn-off module is connected with the power supply end of the HPLC communication unit that is surveyed, is used for when unusual detection module output unusual instruction level gives when the output turns-off module, the power supply of the HPLC communication unit that is surveyed is turned off in the control of output turn-off module.
Further, the resistance sampling module comprises a sampling resistor and a first decoupling capacitor which are connected in parallel, and one end of the sampling resistor is connected with the current output end of the tested HPLC communication unit.
Further, the differential amplification module includes a differential operational amplifier and a second decoupling capacitor, the differential operational amplifier is connected in parallel to two ends of the sampling resistor, and an input voltage end V + of the differential operational amplifier is grounded through the second decoupling capacitor.
Furthermore, the sampling output module comprises a first current limiting resistor and a third decoupling capacitor, one end of the first current limiting resistor is connected with the output end of the differential amplification module, and the other end of the first current limiting resistor is grounded through the third decoupling capacitor.
Further, the abnormality detection module includes a first voltage dividing resistor unit, a first control triode and a pull-up resistor, the first voltage dividing resistor unit includes a first voltage dividing resistor and a second voltage dividing resistor which are connected with each other, a base of the first control triode is connected with the first voltage dividing resistor and the second voltage dividing resistor respectively, a collector of the first control triode is connected to a power supply through the pull-up resistor, and when a current value output by the sampling output module is larger than a preset threshold value, the first control triode is conducted and outputs a preset type level through the collector.
Furthermore, an anti-reverse diode is arranged at the output end of the abnormality detection module.
Furthermore, the output turn-off module comprises a second voltage division unit, a second control triode, a third voltage division unit and a control switch tube, wherein the base electrode of the second control triode is connected with a switch enabling signal through the third voltage division unit, and the collector electrode of the second control triode is connected with the control switch tube through the second voltage division unit.
Furthermore, the second voltage division unit comprises a third voltage division resistor and a fourth voltage division resistor which are connected with each other, one end of the third voltage division resistor is connected with the collector of the second control triode, the other end of the third voltage division resistor is connected with the control switch tube through the fourth voltage division resistor, and two ends of the fourth voltage division resistor are also connected with a delay capacitor in parallel; the third voltage division unit comprises a fifth voltage division resistor and a sixth voltage division resistor, one end of the fifth voltage division resistor is respectively connected with the base electrode of the second control triode and grounded through the sixth voltage division resistor, and the other end of the fifth voltage division resistor is connected with the switch enabling signal end.
Further, the input of resistance sampling module still is provided with input protection module, input protection module includes interconnect's control switch and second current-limiting resistor, control switch set up at the electric current incoming end of being surveyed HPLC communication unit with between the resistance sampling module.
An HPLC communication unit fault diagnosis device comprises the current detection circuit and a fault output device, wherein the output end of the current detection circuit is connected with the input end of the fault output device, the detection result of the current detection circuit is output through the fault output device, and the fault output device comprises a display device and/or a fault alarm device.
Compared with the prior art, the utility model has the advantages of: the utility model discloses can be applicable to the current detection of HPLC communication unit, whether accurate detection goes out HPLC communication unit and has the state of overflowing in the course of the work, and is simple structure not only, need not complicated circuit structure, and it is high to detect the precision, can compromise circuit structure complexity and detect the precision, satisfy HPLC communication unit's detection demand, it is timely when detecting the state of overflowing simultaneously, automatic disconnection HPLC communication unit's power supply, make to possess the fault protection function to HPLC communication unit, effectively ensure the fail safe nature of HPLC communication unit in the operation process.
Drawings
Fig. 1 is a schematic diagram of a partial circuit structure of a current detection circuit of an HPLC communication unit in this embodiment.
Fig. 2 is a schematic diagram of a specific circuit structure of the output shutdown module in this embodiment.
Fig. 3 is a schematic diagram of a specific circuit structure of the input protection module in this embodiment.
Fig. 4 is a schematic diagram of a complete circuit structure of the current detection circuit of the HPLC communication unit of the present embodiment.
Illustration of the drawings: 1. a resistance sampling module; 2. a differential amplification module; 3. a sampling output module; 4. an anomaly detection module; 5. an output turn-off module; 6. and an input protection module.
Detailed Description
The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention.
As shown in fig. 1 to 4, the current detection circuit of the HPLC communication unit in this embodiment includes a resistance sampling module 1, a differential amplification module 2, a sampling output module 3, an abnormal detection module 4, and an output shutdown module 5, where the resistance sampling module 1 is connected to a current output end of the HPLC communication unit to be detected, the differential amplification module 2 is disposed in parallel on two sides of a sampling resistor in the resistance sampling module 1, the output shutdown module 5 is connected to a power supply end of the HPLC communication unit to be detected, the resistance sampling module 1 samples a current value of the HPLC communication unit during operation, the differential amplification module 2 amplifies voltages at two ends of the sampling resistor in the resistance sampling module 1, the sampled current value is output to the abnormal detection module 4 through the sampling output module 3, when the current value output by the sampling output module 3 is greater than a preset threshold, the abnormal detection module 4 outputs an abnormal indication level to the output shutdown module 5, and when the abnormal indication level is received by the output shutdown module 5, the power supply of the HPLC communication unit to be detected is controlled to be shut down, which whether the HPLC communication unit has an overcurrent state accurately detected, and when the overcurrent state is detected, the communication unit is detected, thereby realizing an intelligent HPLC protection unit.
As shown in fig. 1, in this embodiment, the resistance sampling module 1 specifically includes a sampling resistor R121 and a first decoupling capacitor C162 connected in parallel, where one end of the sampling resistor R121 is connected to a current output end of the HPLC communication unit under test. After the current output end of the tested HPLC communication unit is connected, when the HPLC communication unit works, the current flows through the sampling resistor R121, a voltage difference is generated at two ends of the sampling resistor R121, the current value is converted into a voltage value through the sampling resistor R121 for detection, and the value of the voltage difference is the product of the flowing current value and the resistance value.
In this embodiment, as shown in fig. 1, the differential amplification module 2 specifically includes a differential operational amplifier U14 and a second decoupling capacitor C170, the differential operational amplifier U14 is connected in parallel to two ends of the sampling resistor R121, and an input voltage end V + of the differential operational amplifier U14 is grounded through the second decoupling capacitor C170. The positive and negative input terminals IN +, IN-of the differential operational amplifier U14 are respectively connected to two ends of the sampling resistor R121. By arranging the differential amplification modules 2 at the two ends of the sampling resistor, the sampling precision is improved while the working current of the HPLC communication unit is sampled.
In a specific application embodiment, the voltage difference value amplified by the differential amplification module 2 can be subjected to AD sampling by using the MCU, and since the voltage difference generated at two ends of the sampling resistor R121 is amplified by the differential amplification module 2, the voltage difference can be amplified to a range of the required AD sampling, and the sampling precision can be effectively improved.
As shown in fig. 1, in this embodiment, the sampling output module 3 specifically includes a first current limiting resistor R120 and a third decoupling capacitor C171, one end of the first current limiting resistor R120 is connected to the output end of the differential amplification module 2, and the other end of the first current limiting resistor R120 is grounded through the third decoupling capacitor C171. The first current limiting resistor R120 and the decoupling capacitor C171 may form an RC low pass filter, which may filter some useless high frequency noise, so as to output a high quality detection signal after filtering the high frequency noise.
As shown in fig. 1, the abnormality detection module 4 in this embodiment includes a first voltage dividing resistor unit, a first control transistor V17 and a pull-up resistor R140, the first voltage dividing resistor unit includes a first voltage dividing resistor R141 and a second voltage dividing resistor R145 that are connected to each other, a base of the first control transistor V17 is connected to the first voltage dividing resistor R141 and the second voltage dividing resistor R145, respectively, a collector of the first control transistor V17 is connected to a power supply through the pull-up resistor R140, and when a current value output by the sampling output module 3 is greater than a preset threshold value, the first control transistor V17 is turned on, and outputs a preset type level through the collector of the first control transistor V17, for example, the output is changed from a high level to a low level. The output end of the anomaly detection module 4 is further provided with an anti-reverse diode VD13 to prevent the occurrence of reverse flow, and the anti-reverse diode VD13 is specifically arranged at the collector end of the first control triode V17, that is, at the output end of the sampling output module 3. If the resistance parameters of the first divider resistor R141 and the second divider resistor R145 determine the threshold for determining the abnormal state, the corresponding threshold for determining the abnormal state can be adjusted by adjusting the resistance parameters of the first divider resistor R141 and the second divider resistor R145.
As shown in fig. 1, the collector terminal of the first control transistor V17 is used as the output terminal PLC _ STA, when the current value flowing through the sampling resistor R121 exceeds the preset current value, the VBE voltage of the first control transistor V17 will exceed 0.6V, at this time, the first control transistor V17 will be turned on, and the output terminal PLC _ STA changes from high level to low level.
As shown in fig. 2, in this embodiment, the output turn-off module 5 includes a second voltage division unit, a second control triode V6, a third voltage division unit, and a control switch tube V3, a base of the second control triode V6 is connected to a switch enable signal through the third voltage division unit, and a collector of the second control triode V is connected to the control switch tube through the second voltage division unit, so that the control switch tube V3 is used as a switch tube of the HPLC communication unit 12V power supply, thereby implementing the switch enable of the power supply. The control switch tube V3 specifically adopts a PMOS tube, and certainly, other types of switch tubes can be adopted according to actual requirements.
The second voltage division unit specifically comprises a third voltage division resistor R115 and a fourth voltage division resistor R114 which are connected with each other, one end of the third voltage division resistor R115 is connected with the collector of the second control triode V6, the other end of the third voltage division resistor R115 is connected with the control switch tube V3 through the fourth voltage division resistor R114, and two ends of the fourth voltage division resistor R114 are further connected with a delay capacitor C167 in parallel. The third voltage division unit comprises a fifth voltage division resistor R116 and a sixth voltage division resistor R117, one end of the fifth voltage division resistor R116 is respectively connected with the base electrode of the second control triode V6 and is grounded through the sixth voltage division resistor R117, and the other end of the fifth voltage division resistor R116 is connected with a switch enabling signal end to access a power switch enabling signal RTB _ PWR. The power switch enabling signal RTB _ PWR can be generated according to the detection result of the abnormality detection module 4, if the current value output by the sampling output module 3 is larger than the preset threshold value, the first control triode V17 in the abnormality detection module 4 is conducted, the output of the first control triode V17 is changed from high level to low level, which indicates that abnormality exists, the power switch enabling signal RTB _ PWR is output as low level, otherwise, high level is output under normal condition, when the power switch enabling signal RTB _ PWR is high level, the switch tube V3 is controlled to be conducted, the power is turned on for output, and the normal operation of the HPLC communication unit is kept; when the power switch enable signal RTB _ PWR is at a low level, the control switch tube V3 is closed, the power supply is closed to output, and the power supply of the HPLC communication unit is closed.
As shown in fig. 3, in this embodiment, an input protection module 6 is further disposed at an input end of the resistance sampling module 1, the input protection module 6 includes a control switch U16 and a second current limiting resistor R97 that are connected to each other, and the control switch U16 is disposed between a current access end of the HPLC communication unit to be tested and the resistance sampling module 1. By arranging the input protection module 6, the power supply of the front-stage circuit can be prevented from being influenced when the rear-stage circuit fails.
The control switch U16 may specifically adopt an electronic power switch, and the specific type may be selected according to actual requirements, as shown in fig. 3, + VIN is a 12V power input end of the input protection module 6, 12v_rtb is a 12V power output end of the input protection module 6, the SET end SET of the control switch U16 is grounded through the second current-limiting resistor R97, the input end VIN is connected to the 12V power input end (i.e., the + VIN end), and the output end VOUT is connected to the 12V power output end (i.e., the 12v_rtb end). When the current flowing through the 5 pin (VIN input terminal) and the 1 pin (VOUT output terminal) of the control switch U16 exceeds a preset current value, the power supply of 12v _rtbof the HPLC communication unit is turned off.
Referring to fig. 4, in a specific application embodiment, the working principle of the current detection circuit of the HPLC communication unit is specifically: when the HPLC communication unit works, a current flows through the sampling resistor R121, a voltage difference is generated at two ends of the sampling resistor R121, the sampling resistor R121 converts a current value into a voltage value for detection, and the voltage difference generated at two ends of the sampling resistor R121 is amplified by the differential operational amplifier U14 to provide sampling accuracy; the amplified voltage value does not exceed 2.5V, and the voltage value passes through the current limiting resistor R120 and the decoupling capacitor C171 and then outputs an effective current detection value (for example, the voltage value is input to the MCU for AD sampling, and the specific output mode can be selected according to actual requirements); and comparing the amplified voltage value, adjusting the resistance parameters of the first divider resistor R141 and the second divider resistor R145 according to a preset current value which is set as required, outputting a high level to a low level at the PLC _ STA end when the current value of the HPLC communication unit exceeds the current value of the preset value, changing the power switch enabling signal RTB _ PWR into the low level, and disconnecting a switch in the output shutdown module 5 to shut off the power supply of the HPLC communication unit.
In a specific application embodiment, the current value input by the power supply of the HPLC communication unit is detected in real time through the current detection circuit of the HPLC communication unit, the detected current data is further compared with power consumption data of national network standard, and the result is displayed on a liquid crystal screen. In the current detection circuit of the HPLC communication unit, the abnormality detection under different standards can be satisfied by adjusting the resistance values of the first divider resistor R141 and the second divider resistor R145 in the abnormality detection module 4, when the current of the HPLC communication unit exceeds the value of the preset standard, for example, the standard of the HPLC single-phase communication unit does not exceed 125ma, the standard of the HPLC three-phase communication unit does not exceed 400ma, the standard of the HPLC routing communication unit does not exceed 400mA, and if the detected current value exceeds the preset value, the alarm information is controlled to be sent, the data with excessive power consumption is saved, and meanwhile, the power supply of the HPLC communication unit is controlled to be turned off, so that the circuit is prevented from being damaged.
The embodiment also provides a fault diagnosis device for the HPLC communication unit, which includes the current detection circuit and the fault output device, where the output end of the current detection circuit is connected to the input end of the fault output device, the detection result of the current detection circuit is output through the fault output device, and the fault output device includes a display device and a fault alarm device, which can be configured according to actual requirements to form a set of fault diagnosis devices with functions of evaluation display, alarm, etc.
As used in this disclosure, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Likewise, the word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical essence of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. An HPLC communication unit current detection circuit, characterized by: including resistance sampling module (1), difference amplification module (2), sampling output module (3), unusual detection module (4) and the output turn-off module (5) that connect gradually, resistance sampling module (1) is connected with the current output end of the HPLC communication unit that is surveyed to be used for sampling the current value of HPLC communication unit during operation, difference amplification module (2) with sampling resistance parallel connection in resistance sampling module (1) for amplify the voltage at sampling resistance both ends, output turn-off module (5) is connected with the power supply end of being surveyed HPLC communication unit, for working as unusual detection module (4) output unusual indication level give when output turn-off module (5), output turn-off module (5) control turns off the power supply of being surveyed HPLC communication unit.
2. An HPLC communication unit current detection circuit according to claim 1, wherein said resistance sampling module (1) comprises a sampling resistance and a first decoupling capacitor connected in parallel, one end of said sampling resistance being connected to the current output terminal of said HPLC communication unit under test.
3. An HPLC communication unit current detection circuit according to claim 2, wherein said differential amplification module (2) comprises a differential operational amplifier and a second decoupling capacitor, said differential operational amplifier being connected in parallel across said sampling resistor, the input voltage terminal V + of said differential operational amplifier being connected to ground through said second decoupling capacitor.
4. An HPLC communication unit current detection circuit according to claim 1, wherein said sampling output module (3) comprises a first current limiting resistor and a third decoupling capacitor, one end of said first current limiting resistor is connected to the output terminal of said differential amplification module (2), and the other end of said first current limiting resistor is grounded through said third decoupling capacitor.
5. The HPLC communication unit current detection circuit according to claim 1, wherein the anomaly detection module (4) comprises a first voltage dividing resistor unit, a first control triode and a pull-up resistor, the first voltage dividing resistor unit comprises a first voltage dividing resistor and a second voltage dividing resistor which are connected with each other, a base of the first control triode is connected with the first voltage dividing resistor and the second voltage dividing resistor respectively, a collector of the first control triode is connected to a power supply through the pull-up resistor, and when a current value output by the sampling output module (3) is greater than a preset threshold value, the first control triode is turned on and outputs a preset type level through the collector.
6. An HPLC communication unit current detection circuit according to claim 5, characterized in that the output end of the abnormality detection module (4) is further provided with an anti-reverse diode.
7. An HPLC communication unit current detection circuit according to any of claims 1 to 6, wherein said output turn-off module (5) comprises a second voltage dividing unit, a second control triode, a third voltage dividing unit and a control switch tube, wherein the base of said second control triode is connected to a switch enable signal through said third voltage dividing unit, and the collector of said second control triode is connected to said control switch tube through said second voltage dividing unit.
8. An HPLC communication unit current detection circuit according to claim 7, wherein said second voltage dividing unit comprises a third voltage dividing resistor and a fourth voltage dividing resistor connected with each other, one end of said third voltage dividing resistor is connected with the collector of said second control triode, the other end is connected with said control switch tube through said fourth voltage dividing resistor, and two ends of said fourth voltage dividing resistor are further connected with a delay capacitor in parallel; the third voltage division unit comprises a fifth voltage division resistor and a sixth voltage division resistor, one end of the fifth voltage division resistor is respectively connected with the base electrode of the second control triode and grounded through the sixth voltage division resistor, and the other end of the fifth voltage division resistor is connected with the switch enabling signal end.
9. An HPLC communication unit current detection circuit according to any one of claims 1-6, wherein an input protection module (6) is further disposed at an input end of the resistance sampling module (1), the input protection module (6) comprises a control switch and a second current limiting resistor, which are connected to each other, and the control switch is disposed between a current access end of the tested HPLC communication unit and the resistance sampling module (1).
10. An HPLC communication unit fault diagnosis apparatus, comprising a current detection circuit according to any one of claims 1 to 9, and a fault output device, wherein an output terminal of the current detection circuit is connected to an input terminal of the fault output device, a detection result of the current detection circuit is output through the fault output device, and the fault output device comprises a display device and/or a fault alarm device.
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| CN202222520367.9U CN218473155U (en) | 2022-09-22 | 2022-09-22 | Current detection circuit and fault diagnosis device for HPLC communication unit |
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| CN202222520367.9U CN218473155U (en) | 2022-09-22 | 2022-09-22 | Current detection circuit and fault diagnosis device for HPLC communication unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117176199A (en) * | 2023-11-02 | 2023-12-05 | 国网山东省电力公司兰陵县供电公司 | HPLC communication unit fault diagnosis method and device |
| CN117434876A (en) * | 2023-12-19 | 2024-01-23 | 深圳市森威尔科技开发股份有限公司 | OT communication detection circuit and device |
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2022
- 2022-09-22 CN CN202222520367.9U patent/CN218473155U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117176199A (en) * | 2023-11-02 | 2023-12-05 | 国网山东省电力公司兰陵县供电公司 | HPLC communication unit fault diagnosis method and device |
| CN117176199B (en) * | 2023-11-02 | 2024-01-30 | 国网山东省电力公司兰陵县供电公司 | HPLC communication unit fault diagnosis method and device |
| CN117434876A (en) * | 2023-12-19 | 2024-01-23 | 深圳市森威尔科技开发股份有限公司 | OT communication detection circuit and device |
| CN117434876B (en) * | 2023-12-19 | 2024-03-08 | 深圳市森威尔科技开发股份有限公司 | Open temperature control protocol communication detection circuit and device |
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