CN111624384A - Partial pressure monitoring anti-interference device - Google Patents
Partial pressure monitoring anti-interference device Download PDFInfo
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- CN111624384A CN111624384A CN202010504835.6A CN202010504835A CN111624384A CN 111624384 A CN111624384 A CN 111624384A CN 202010504835 A CN202010504835 A CN 202010504835A CN 111624384 A CN111624384 A CN 111624384A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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Abstract
The invention relates to a partial pressure monitoring anti-jamming device, comprising: the input end of the partial pressure monitoring system is connected with the power supply to be detected and used for converting the high voltage of the power supply to be detected into the low voltage; the data acquisition system is connected with the output end of the partial pressure monitoring system through a signal transmission line at an acquisition end and is used for acquiring and processing low voltage to obtain the voltage of the power supply to be detected; the power supply is used for supplying power to the data acquisition system and comprises an isolation transformer, a distributed parameter attenuator and a low-pass filter, wherein the distributed parameter attenuator comprises a first coil and a second coil, and the first coil and the second coil are wound by twisted-pair wires. The isolation transformer and the low-pass filter can effectively inhibit high and low frequency interference, and the attenuator can ensure the anti-interference capability of the low-pass filter, so that the interference introduced by a power supply can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a partial pressure monitoring anti-interference device.
Background
Interference generally refers to noise other than the useful signal, and some harmful electrical changes occurring in the signal input, transmission and output processes, which forces errors or artifacts in the transmission value, the indication value or the output value of the signal. Interference is generally classified into two main categories, one being interference caused by the equipment and feeder system, and the other being other interference, which can be considered as alien interference. Common interferences are conducted interference and radiated interference, wherein conducted interference refers to interference propagating to a sensitive device through a wire, and radiated interference refers to interference propagating to a sensitive device through spatial radiation.
In a data acquisition system, interference introduced by a power supply is one of main interference, for example, because the frequency and voltage fluctuation of a power grid in China is large, the interference can be directly generated on the data acquisition system, in addition, under the severe environments such as lightning and the like, the interference can also be generated on the data acquisition system, the influence of the interference on the data acquisition system is avoided, the accuracy of data acquisition is reduced if the interference is small, the normal function of the system is damaged if the interference is large, and therefore corresponding measures are required to be taken to effectively inhibit the interference introduced by the power supply.
Disclosure of Invention
Therefore, it is necessary to provide a voltage division monitoring anti-jamming device for solving the problem that the power supply introduces interference to affect the data acquisition system.
A voltage division monitoring anti-jamming device, comprising:
the input end of the partial pressure monitoring system is connected with the power supply to be detected and used for converting the high voltage of the power supply to be detected into the low voltage;
the acquisition end of the data acquisition system is connected with the output end of the partial pressure monitoring system through a signal transmission line and is used for acquiring and processing low voltage to obtain the voltage of the power supply to be detected;
the power supply is connected with the power supply end of the data acquisition system and used for supplying power to the data acquisition system, the power supply comprises an isolation transformer, a distributed parameter attenuator and a low-pass filter, the distributed parameter attenuator comprises a first coil and a second coil, two ends of a primary coil of the isolation transformer are correspondingly connected with an alternating current power supply, one end of a secondary coil of the isolation transformer is connected with a first input end of the low-pass filter through a first inductor, the other end of a secondary coil of the isolation transformer is connected with a second input end of the low-pass filter through the second coil, a first output end and a second output end of the low-pass filter are correspondingly connected with the power supply end of the data acquisition system, and the first coil and the second coil are formed by winding a twisted pair.
In one embodiment, a partial pressure monitoring system comprises: a resistive divider, a capacitive divider, or a resistive-capacitive divider.
In one embodiment, the resistor voltage divider comprises a first resistor and a second resistor, one end of the first resistor is connected with a power source to be measured, one end of the second resistor is connected with the other end of the first resistor, a connection point is connected with an acquisition end of the data acquisition system through a signal transmission line, the other end of the second resistor is connected with the concentrated grounding electrode, and the connection line is a metal conductive strip with the length smaller than a preset length and the width larger than a first preset width.
In one embodiment, the signal transmission line is a coaxial cable, the outer shielding layer of the coaxial cable is grounded in a multi-point mode, and the inner shielding layer of the coaxial cable is grounded at least on the side of the partial pressure monitoring system.
In one embodiment, the coaxial cable includes a single-shielded coaxial cable or a double-shielded coaxial cable, and when the coaxial cable is the single-shielded coaxial cable, the single-shielded coaxial cable is disposed in the metal sleeve, and the metal sleeve is grounded at multiple points.
In one embodiment, a first matching resistor is arranged at the starting end of the signal transmission line, one end of the first matching resistor is connected with the output end of the voltage division monitoring system, and the other end of the first matching resistor is connected with the starting end of the signal transmission line;
and/or the presence of a gas in the gas,
and a second matching resistor is arranged at the terminal of the signal transmission line, one end of the second matching resistor is respectively connected with the terminal of the signal transmission line and the acquisition end of the data acquisition system, and the other end of the second matching resistor is grounded.
In one embodiment, the low pass filter comprises: a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor,
one end of the first inductor is connected with one end of the first coil, and the other end of the first inductor is connected with a first power supply end of the data acquisition system;
one end of the second inductor is connected with one end of the second coil, and the other end of the second inductor is connected with a second power supply end of the data acquisition system;
the first capacitor and the second capacitor are connected in series between one end of the first inductor and one end of the second inductor, and the connection point of the first capacitor and the second capacitor is grounded;
the third capacitor and the fourth capacitor are connected between the other end of the first inductor and the other end of the second inductor in series, and the connection point of the third capacitor and the fourth capacitor is grounded.
In one embodiment, the data acquisition system is disposed in a shielding box, and the shielding box is connected to the centralized grounding electrode through a grounding wire, wherein the grounding wire is a metal conductive plate with a width larger than a second preset width.
In one embodiment, a shielding layer is arranged between the primary coil and the secondary coil of the isolation transformer, and the shielding layer is connected with the shielding box.
In one embodiment, when the power supply is arranged in the shielding box, the primary coil of the isolation transformer is arranged in the shielding box in a fully shielding manner; when the power supply is arranged outside the shielding box, the secondary coil of the isolation transformer, the distributed parameter attenuator and the low-pass filter are arranged in the shielding box in a full shielding mode.
The voltage-dividing monitoring anti-interference device converts the high voltage of the power supply to be detected into the low voltage through the voltage-dividing monitoring system, acquires and processes the low voltage through the data acquisition system to obtain the voltage of the power supply to be detected, and the power supply supplies power to the data acquisition system through a power supply, the power supply comprises an isolation transformer, a distributed parameter attenuator and a low-pass filter, the distributed parameter attenuator comprises a first coil and a second coil, two ends of a primary coil of the isolation transformer are correspondingly connected with an alternating current power supply, one end of a secondary coil of the isolation transformer is connected with a first input end of the low-pass filter through a first inductor, the other end of the secondary coil of the isolation transformer is connected with a second input end of the low-pass filter through a second coil, a first output end and a second output end of the low-pass filter are correspondingly connected with a power supply end of the data acquisition system, and the first coil and the second coil are both formed by winding twisted pairs. Because the isolation transformer can effectively restrain the low-frequency interference of the alternating current power supply, the low-pass filter can effectively restrain the high-frequency interference of the alternating current power supply, and the distributed parameter attenuator can effectively prevent the low-pass filter from working in a magnetic saturation state and guarantee the anti-interference capability of the low-pass filter, the effective restraint of the interference of the alternating current power supply can be realized, the influence of the power supply interference on a data acquisition system is reduced, and the reliable work of the data acquisition system is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a partial pressure monitoring anti-jamming device according to a first embodiment;
FIG. 2 is a schematic structural diagram of a voltage division monitoring anti-jamming device according to a second embodiment;
FIG. 3 is a schematic structural diagram of a voltage division monitoring anti-jamming device in a third embodiment;
fig. 4 is a schematic structural diagram of a voltage division monitoring anti-jamming device in a fourth embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Fig. 1 is a schematic structural diagram of a partial pressure monitoring anti-jamming device in an embodiment, and referring to fig. 1, the partial pressure monitoring anti-jamming device includes: partial pressure monitoring system 10, data acquisition system 20 and power supply 30.
The input end of the partial pressure monitoring system 10 is connected with a power supply to be tested, and is used for converting the high voltage of the power supply to be tested into the low voltage; the acquisition end of the data acquisition system 20 is connected with the output end of the partial pressure monitoring system 10 through a signal transmission line 40, and is used for acquiring and processing low voltage to obtain the voltage of the power supply to be detected; the power supply 30 is connected to the power supply end of the data acquisition system 20 for supplying power to the data acquisition system 20, the power supply 30 includes an isolation transformer 31, a distribution parameter attenuator 32 and a low-pass filter 33, the input end of the isolation transformer 31 is connected to an ac power supply, the input end of the distribution parameter attenuator 32 is connected to the output end of the isolation transformer 31, the input end of the low-pass filter 33 is connected to the output end of the distribution parameter attenuator 32, and the output end of the low-pass filter 33 is connected to the power supply end of the data acquisition system 20.
Specifically, the voltage division monitoring system 10 may include a resistor voltage divider, a capacitor voltage divider, or a resistor-capacitor voltage divider, and converts a high voltage (e.g., 380V) of the power source to be tested into a low voltage (e.g., 5V) capable of being collected by the data collection system 20 through the voltage division monitoring system 10, and transmits the low voltage to the data collection system 20 through the signal transmission line 40. The data acquisition system 20 may include an analog-to-digital conversion unit, a controller and a power supply module, and a controller and a power supply module integrated with an analog-to-digital conversion function, or an oscilloscope, and the like, and acquires the low voltage at preset time intervals (e.g., 1ms) through the data acquisition system 20, converts the low voltage into a digital signal, and calculates an actual voltage of the power supply to be measured according to the digital signal. The power supply 30 may include an isolation transformer 31, a distributed parameter attenuator 32, and a low pass filter 33 connected in series in sequence, and the data acquisition system 20 is powered by the power supply 30.
The isolation transformer 31 includes a primary coil and a secondary coil, and suppresses surge voltage and spike current through the isolation transformer 31, thereby achieving electrical isolation between high voltage and low voltage and suppressing low-frequency noise interference. The isolation transformer 31 may be a general isolation transformer or a super isolation transformer, etc. When the isolation transformer 31 is a common isolation transformer, since the common isolation transformer can only effectively suppress low-frequency interference, and high-frequency interference can still intrude into the data acquisition system 20 through a parasitic capacitance between the primary coil and the secondary coil of the isolation transformer 31, the low-pass filter 33 is disposed on the secondary side of the isolation transformer 31, and the low-pass filter 33 filters the high-frequency interference, thereby improving the waveform of the power supply.
The low pass filter 33 may be composed of an inductor and a capacitor. For example, referring to fig. 2, the low pass filter 33 may include a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, wherein one end of the first inductor L1 is connected to one end of the secondary winding of the isolation transformer 31, and the other end of the first inductor L1 is connected to the first power supply end of the data acquisition system 20; one end of the second inductor L2 is connected to the other end of the secondary winding of the isolation transformer 31, and the other end of the second inductor L2 is connected to the second power supply end of the data acquisition system 20; a first capacitor C1 and a second capacitor C2 are connected in series between one end of the first inductor L1 and one end of the second inductor L2, and the connection point of the first capacitor C1 and the second capacitor C2 is grounded; the third capacitor C3 and the fourth capacitor C4 are connected in series between the other end of the first inductor L1 and the other end of the second inductor L2, and the connection point of the third capacitor C3 and the fourth capacitor C4 is grounded. Of course, the low-pass filter 33 may also have other structures, and is not limited herein.
Further, considering that when the high-frequency interference voltage is high, the inductance of the low-pass filter 33 may be magnetically saturated, which may cause the inductance to lose its function, resulting in the interference rejection, a distributed parameter attenuator 32 is disposed between the isolation transformer 31 and the low-pass filter 33, and the distributed parameter attenuator 32 attenuates or even filters the high-frequency interference with high voltage, so as to prevent the low-pass filter 33 from entering a magnetically saturated state, resulting in the interference rejection. The distributed parameter attenuator 32 may include a first coil X1 and a second coil X2, the first coil X1 is connected in series between one end of the first inductor L1 and one end of the secondary coil of the isolation transformer 31, the second coil X2 is connected in series between one end of the second inductor L2 and the other end of the secondary coil of the isolation transformer 31, the first coil X1 and the second coil X2 are both formed by winding twisted pairs with a certain length, and various interference pulses passing through the first coil X1 and the second coil X2 are attenuated and even filtered by distributed capacitors and distributed inductors existing between two twisted pairs and between twisted pairs, so as to ensure that the inductor of the low pass filter 33 works in a non-saturation region, thereby ensuring the anti-interference capability of the low pass filter.
In the embodiment, the isolation transformer can effectively suppress the low-frequency interference of the alternating-current power supply, the low-pass filter can effectively suppress the high-frequency interference of the alternating-current power supply, and the distributed parameter attenuator can effectively prevent the low-pass filter from working in a magnetic saturation state, so that the anti-interference capability of the low-pass filter is ensured, the effective suppression of the interference of the alternating-current power supply can be realized, the influence of the power supply interference on a data acquisition system is reduced, and the reliable work of the data acquisition system is ensured.
In one embodiment, referring to fig. 3, the power supply 30 may further include an ac voltage regulator 34, an input terminal of the ac voltage regulator 34 is connected to the ac power, an output terminal of the ac voltage regulator 34 is connected to the primary winding of the isolation transformer 31, and the ac power is regulated by the ac voltage regulator 34.
Specifically, the ac voltage regulator 34 may include a voltage regulating circuit, a voltage sampling circuit, and a control circuit (none of which is specifically shown), wherein an input end of the voltage regulating circuit is connected to the ac power supply, and an output end of the voltage regulating circuit is connected to the isolation transformer 31, and is configured to perform a voltage step-up and step-down process on the ac power supply; the input end of the voltage sampling circuit is connected with the output end of the voltage regulating circuit and is used for collecting the output voltage of the voltage regulating circuit; the control circuit is connected with the control end of the voltage regulating circuit and the output end of the voltage sampling circuit respectively and used for controlling the on-off of the switch tube of the voltage regulating circuit according to the output voltage of the voltage regulating circuit so as to ensure the stability of the output voltage of the voltage regulating circuit, and controlling the voltage regulating circuit to stop outputting when overvoltage or undervoltage occurs, so that the stability of an alternating current power supply is ensured, and the influence on rear-end equipment caused by overvoltage or undervoltage of the alternating current power supply is prevented.
In one embodiment, referring to fig. 3, the power supply 30 further includes a dc voltage regulator 35, an input terminal of the dc voltage regulator 35 is connected to an output terminal of the low pass filter 33, an output terminal of the dc voltage regulator 35 is connected to a power supply terminal of the data acquisition system 20, and a voltage of the ac power supply is converted into a predetermined dc power by the dc voltage regulator 35 to power the data acquisition system 20.
Specifically, when the data acquisition system 20 only includes a monitoring device such as a controller, and does not have a power supply device, the power supply 30 further includes a dc voltage stabilizer 35, and the ac power (e.g., 220V) is converted into a predetermined dc power (e.g., 5V) by the dc voltage stabilizer 35 to supply power to the monitoring device, such as the controller, of the data acquisition system 20.
Specifically, the dc voltage stabilizer 35 may include a rectifying and filtering circuit, a voltage sampling circuit and a control circuit (none of which is specifically shown), wherein an input end of the rectifying and filtering circuit is connected to an output end of the low pass filter 33, and an output end of the rectifying and filtering circuit is connected to a power supply end of the data acquisition system 20, and is configured to convert the ac power output by the low pass filter 33 into dc power to supply the data acquisition system 20; the input end of the voltage sampling circuit is connected with the output end of the rectification filter circuit and is used for collecting the output voltage of the rectification filter circuit; the control circuit is connected with the control end of the rectifying and filtering circuit and the output end of the voltage sampling circuit respectively and is used for controlling the on-off of a switch tube of the rectifying and filtering circuit according to the output voltage of the rectifying and filtering circuit so as to ensure the stability of the output voltage of the rectifying and filtering circuit and the power supply stability of the data acquisition system.
In one embodiment, referring to fig. 2, the voltage division monitoring system 10 includes a resistor voltage divider, which may further include a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is connected to the power source to be tested; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the connection point is connected to the acquisition end of the data acquisition system 20 through the signal transmission line 40, and the other end of the second resistor R2 is connected to the concentrated ground GND, and the connection line is a metal conductive strip with a length smaller than a preset length and a width larger than a first preset width.
Specifically, the voltage division monitoring system 10 may include a resistor divider, which may be composed of a first resistor R1 and a second resistor R2 connected in series, where the first resistor R1 is used as a high voltage arm resistor to bear the high voltage of almost all the power supplies to be measured, and the second resistor R2 is used as a low voltage arm resistor through which a suitable low voltage may be led out for the data acquisition system 20 to acquire. The resistor voltage divider is arranged close to the concentrated grounding electrode GND and connected with the concentrated grounding electrode GND through the shortest connecting line, the connecting line adopts a wider metal conductive belt, such as a copper belt or an aluminum belt, and the length and the width of the specific connecting line are set according to actual conditions, and are not limited here.
In one embodiment, the signal transmission line 40 is a coaxial cable, the outer shield of which is grounded at multiple points, and the inner shield of which is grounded at least on the partial pressure monitoring system 10 side.
Specifically, a coaxial cable refers to a cable having two concentric conductors, wherein the conductor and the shielding layer share the same axis, and most common coaxial cables are composed of copper conductors separated by an insulating material, and another layer of annular conductor and its insulator are arranged outside the inner layer of insulating material, and then the whole cable is covered by a sheath made of polyvinyl chloride or the like. The inner layer insulating material forms an inner shielding layer of the coaxial cable, the insulator of the annular conductor forms an outer shielding layer of the coaxial cable, and the inner shielding layer and the outer shielding layer are used for realizing the electrical isolation between a copper wire and the annular conductor of the coaxial cable and the electrical isolation between the annular conductor and the outside.
When the signal transmission line 40 is a coaxial cable, the outer shielding layer of the coaxial cable is grounded at multiple points, for example, when the coaxial cable is long, at least one of two ends and the middle of the outer shielding layer of the coaxial cable can be grounded; when the coaxial cable is short, only two ends of the outer shielding layer of the coaxial cable are grounded, and meanwhile, one end of the inner shielding layer of the coaxial cable, which is close to the partial pressure monitoring system 10, is grounded, and whether the other end is grounded can be determined according to the anti-interference capability of the data acquisition system 20. Therefore, the interference introduced by the signal transmission line is reduced by grounding the transmission signal line.
In one embodiment, the coaxial cable includes a single shield coaxial cable or a double shield coaxial cable, and when the coaxial cable is a single shield coaxial cable, as shown in fig. 2, the single shield coaxial cable is disposed in the metal sleeve 50, and the metal sleeve 50 is grounded at multiple points.
Specifically, when the coaxial cable is a single-shielded coaxial cable, a metal sleeve 50 may be sleeved outside the coaxial cable, and the metal sleeve 50 achieves a double-shielding effect to enhance the anti-interference capability of the single-shielded coaxial cable, and meanwhile, the metal sleeve 50 is also grounded at multiple points, and the grounding point of the metal sleeve may be the same as the grounding point of the outer shielding layer of the coaxial cable. It should be noted that, even if a double-shielded coaxial cable is used, a metal sleeve 50 may be sleeved outside the double-shielded coaxial cable to enhance the interference resistance.
In one embodiment, at least one end of the signal transmission line 40 is provided with a matching resistance.
Specifically, referring to fig. 2, a first matching resistor R3 may be disposed at the beginning of the signal transmission line 40, one end of the first matching resistor R3 is connected to the output end of the voltage division monitoring system 10, that is, to the connection point of the first resistor R1 and the second resistor R2, and the other end of the first matching resistor R3 is connected to the beginning of the signal transmission line 40. Or, a second matching resistor R4 is disposed at the terminal of the signal transmission line 40, one end of the second matching resistor R4 is connected to the terminal of the signal transmission line 40 and the acquisition end of the signal acquisition system 20, respectively, and the other end of the second matching resistor R4 is grounded. Alternatively, a first matching resistor R3 is provided at the beginning of the signal transmission line 40, while a second matching resistor R4 is provided at the end of the signal transmission line 40.
In one embodiment, the data acquisition system 20 is disposed in the shielding box 60, and the shielding box 60 is connected to the concentrated ground GND through a ground line 70, where the ground line 70 is a metal conductive plate with a width greater than a second predetermined width. That is, the data acquisition system 20 is disposed in the shield case 60 to reduce external radiation interference, and a metal plate or metal tape having a large width is laid as a ground line between the data acquisition system 20 and the concentrated ground electrode GND, and the shield case 60 is connected to the ground line. Meanwhile, the signal transmission line 40 may be laid against the ground along the ground line, and preferably, the signal transmission line 40 is disposed between the ground line and the ground to shield the signal transmission line 40 to reduce external radiation interference.
In one embodiment, a shielding layer is disposed between the primary coil and the secondary coil of the isolation transformer 31, and the shielding layer is connected to the shielding box 60. Specifically, as is clear from the above analysis, since the high-frequency interference propagates by coupling of the parasitic capacitance between the primary coil and the secondary coil of the isolation transformer 31, it is possible to reduce the parasitic capacitance and improve the common-mode interference resistance by providing a low-pass filter 33 on the secondary coil side of the isolation transformer 31 and by providing a shield layer between the primary coil and the secondary coil and isolating the low-pass filter by the shield layer. The shielding layer of the isolation transformer 31 may be formed by winding a layer of non-magnetic material such as enameled wire or copper around the primary coil and the secondary coil to ensure that the layer is not electrically short-circuited with the primary coil and the secondary coil, and then leading out a terminal to be grounded, for example, via the shielding box 60 to form the shielding layer.
In one embodiment, referring to FIG. 2, when the power supply 30 includes an isolation transformer 31, a distributed parameter attenuator 32, and a low pass filter 33, when the power supply 30 is disposed within the shielded enclosure 60, the primary coil of the isolation transformer 31 is disposed fully shielded within the shielded enclosure 80; when the power supply 30 is disposed outside the shield case 60, the secondary coil of the isolation transformer 31, the distributed parameter attenuator 32, and the low-pass filter 33 are disposed inside the shield case 80 in a full shield.
Specifically, the power supply 30 may be provided inside the shield box 60 or outside the shield box 60. When the power supply 30 is disposed in the shielding box 60, the primary coil of the isolation transformer 31 can be isolated in a fully shielded manner to reduce interference with other devices in the shielding box 60, for example, the primary coil of the isolation transformer 31 is disposed in a shielding box 80, the shielding box 80 is designed in a fully enclosed manner, and the shielding box 80 is grounded; when the power supply 30 is disposed outside the shielding box 60, the secondary coil of the isolation transformer 31, the distributed parameter attenuator 32, and the low-pass filter 33 may be isolated in a fully shielded manner to reduce external interference thereto, for example, the secondary coil of the isolation transformer 31, the distributed parameter attenuator 32, and the low-pass filter 33 are disposed inside a shielding box 80, the shielding box 80 is of a fully enclosed design, and the shielding box 80 is grounded. It is understood that the primary coil of the isolation transformer 31, the secondary coil of the isolation transformer 31, the distributed parameter attenuator 32 and the low pass filter 33 may be disposed in different shielding boxes, respectively, the connection line between the devices is shielded by the shielding plate, and each shielding box is grounded.
In one embodiment, when the power supply 30 includes the isolation transformer 31, the distributed parameter attenuator 32, the low pass filter 33, the ac regulator 34, and the dc regulator 35, when the power supply 30 is disposed in the shielding box 60, the primary coil of the isolation transformer 31 and the ac regulator 34 are disposed in the shielding box 80 in a fully shielded manner; when the power supply 30 is disposed outside the shielding box 60, the secondary winding of the isolation transformer 31, the distributed parameter attenuator 32, the low-pass filter 33, and the dc regulator 35 are disposed inside the shielding box 80 in a fully shielded manner.
Specifically, the power supply 30 may be provided inside the shield box 60 or outside the shield box 60. When the power supply 30 is disposed in the shielding box 60, the primary winding of the isolation transformer 31 and the ac voltage stabilizer 34 may be isolated in a fully shielded manner to reduce interference with other devices in the shielding box 60, for example, the primary winding of the isolation transformer 31 and the ac voltage stabilizer 34 are disposed in a shielding box 80, the shielding box 80 is designed in a fully enclosed manner, and the shielding box 80 is grounded; when the power supply 30 is disposed outside the shielding box 60, the secondary winding of the isolation transformer 31, the distributed parameter attenuator 32, the low-pass filter 33 and the dc regulator 35 may be isolated in a fully shielded manner to reduce the external interference, for example, the secondary winding of the isolation transformer 31, the distributed parameter attenuator 32, the low-pass filter 33 and the dc regulator 35 are disposed inside a shielding box 80, the shielding box 80 is designed in a fully enclosed manner, and the shielding box 80 is grounded.
It is understood that, referring to fig. 4, the ac voltage stabilizer 34, the primary winding of the isolation transformer 31, the secondary winding of the isolation transformer 31, the distributed parameter attenuator 32, the low pass filter 33, and the dc voltage stabilizer 35 may be disposed in different shielding boxes, respectively, the connection line between the devices is shielded by the shielding plate, and each shielding box is grounded.
It should be noted that all wires in this application are routed as close to ground as possible to reduce coupling.
To sum up, the partial pressure monitoring anti jamming unit of this application can effectively reduce the interference that the power introduced through isolation transformer, distribution parameter attenuator and low pass filter, through adopting coaxial cable to carry out signal transmission, and the outside cover of coaxial cable is equipped with metal sleeve, can effectively reduce the interference of external interference to signal transmission, and set up and ground connection through many-sided shielding, can effectively reduce the radiation interference of external interference to each equipment, thereby effectively reduced the influence of external interference to data acquisition system, guarantee that data acquisition system can be safe, reliable work, data acquisition's accuracy and reliability have been guaranteed.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a partial pressure monitoring anti jamming unit which characterized in that includes:
the input end of the partial pressure monitoring system is connected with a power supply to be detected and used for converting the high voltage of the power supply to be detected into the low voltage;
the acquisition end of the data acquisition system is connected with the output end of the partial pressure monitoring system through a signal transmission line and is used for acquiring and processing the low voltage to obtain the voltage of the power supply to be detected;
a power supply connected with the power supply end of the data acquisition system for supplying power to the data acquisition system, the power supply comprises an isolation transformer, a distributed parameter attenuator and a low-pass filter, the distributed parameter attenuator comprises a first coil and a second coil, two ends of a primary coil of the isolation transformer are correspondingly connected with an alternating current power supply, one end of a secondary coil of the isolation transformer is connected with a first input end of the low-pass filter through the first inductor, the other end of the secondary coil of the isolation transformer is connected with the second input end of the low-pass filter through the second coil, the first output end and the second output end of the low-pass filter are correspondingly connected with a power supply end of the data acquisition system, and the first coil and the second coil are both formed by winding twisted-pair wires.
2. The partial pressure monitoring immunity device of claim 1, wherein the partial pressure monitoring system comprises: a resistive divider, a capacitive divider, or a resistive-capacitive divider.
3. The partial pressure monitoring anti-jamming device according to claim 2, characterized in that the resistor divider comprises a first resistor and a second resistor, one end of the first resistor is connected to the power source to be tested, one end of the second resistor is connected to the other end of the first resistor, and a connection point is connected to the acquisition end of the data acquisition system through the signal transmission line, the other end of the second resistor is connected to the centralized grounding electrode, and the connection line is a metal conductive strip with a length smaller than a preset length and a width larger than a first preset width.
4. The apparatus according to claim 1, wherein the signal transmission line is a coaxial cable, an outer shielding layer of the coaxial cable is grounded at multiple points, and an inner shielding layer of the coaxial cable is grounded at least at the side of the partial pressure monitoring system.
5. The apparatus according to claim 4, wherein said coaxial cable comprises a single-shielded coaxial cable or a double-shielded coaxial cable, and when said coaxial cable is said single-shielded coaxial cable, said single-shielded coaxial cable is disposed in a metal sleeve, and said metal sleeve is grounded at multiple points.
6. The partial pressure monitoring anti-jamming device according to claim 1, characterized in that a first matching resistor is provided at the beginning of the signal transmission line, one end of the first matching resistor is connected to the output end of the partial pressure monitoring system, and the other end of the first matching resistor is connected to the beginning of the signal transmission line;
and/or the presence of a gas in the gas,
and the terminal of the signal transmission line is provided with a second matching resistor, one end of the second matching resistor is respectively connected with the terminal of the signal transmission line and the acquisition end of the data acquisition system, and the other end of the second matching resistor is grounded.
7. The partial pressure monitoring immunity device of claim 1, wherein the low pass filter comprises: a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor,
one end of the first inductor is connected with one end of the first coil, and the other end of the first inductor is connected with a first power supply end of the data acquisition system;
one end of the second inductor is connected with one end of the second coil, and the other end of the second inductor is connected with a second power supply end of the data acquisition system;
the first capacitor and the second capacitor are connected in series between one end of the first inductor and one end of the second inductor, and the connection point of the first capacitor and the second capacitor is grounded;
the third capacitor and the fourth capacitor are connected in series between the other end of the first inductor and the other end of the second inductor, and the connection point of the third capacitor and the fourth capacitor is grounded.
8. The apparatus according to claim 3, wherein said data acquisition system is disposed in a shielding box, and said shielding box is connected to said centralized ground electrode through a ground wire, said ground wire being a metal conductive plate having a width greater than a second predetermined width.
9. The apparatus according to claim 8, wherein a shielding layer is disposed between the primary winding and the secondary winding of the isolation transformer, and the shielding layer is connected to the shielding box.
10. The apparatus according to claim 8, wherein when said power supply is disposed in said shielding box, the primary coil of said isolation transformer is disposed in the shielding box in a fully shielded manner; when the power supply is arranged outside the shielding box, the secondary coil of the isolation transformer, the distributed parameter attenuator and the low-pass filter are arranged in the shielding box in a full shielding mode.
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| CN202010504835.6A CN111624384A (en) | 2020-06-05 | 2020-06-05 | Partial pressure monitoring anti-interference device |
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| CN202010504835.6A CN111624384A (en) | 2020-06-05 | 2020-06-05 | Partial pressure monitoring anti-interference device |
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