KR102219951B1 - Noise canceling hybrid filter module - Google Patents

Abstract

The present invention relates to a noise canceling hybrid filter module installed at a power stage of high power equipment to reduce noise. The noise canceling hybrid filter module comprises: a passive filter module to reduce broadband noise generated by an electronic device using power of a power stage; a noise detector to detect narrow band noise generated by an electronic device using power of a power stage; an active filter module to generate a signal for generating anti-phase noise with respect to the narrowband noise detected by the noise detector; a noise offset exchanger for receiving a signal from the active filter module to provide the anti-phase noise to the power stage. The present invention reduces broadband noise of a relatively low level using advantages of the passive filter module. The active filter module generates an anti-phase with respect to the narrowband noise with respect to switching noise selectively used by an electronic device. Accordingly, the present invention solves a problem that an existing active filter requires an IC circuit with high performance and a high level of algorithm technique capable of responding to noise changing moment by moment by detecting the entire noise (150 KHz to 30 MHz) in a designated section so as to quickly detect the same only with an IC circuit with lower performance than the standard by concentrating a detection point only on the switching noise used in the electronic device and sufficiently response to the same with a low level of algorithm.

Description

Noise canceling hybrid filter module

The present invention relates to a noise canceling hybrid filter module, and more particularly, effectively solves electromagnetic noise generated at the power supply terminal of equipment using high output power, such as a network cabinet used for nuclear power plants, and The present invention relates to a noise canceling hybrid filter module that effectively copes with noise to compensate for electrical instability.

Domestic nuclear power plants started commercial operation of Kori 1 in 1977 and are currently operating 24 operating and 5 construction nuclear power plants. As of 2018, the total domestic electricity production was 520,230 GW/h, of which nuclear power plants accounted for 141,098 GW/h, accounting for 27.12% of the total domestic electricity production.

As technology in the nuclear power generation industry develops, aging analog devices are being replaced with digital products, and in the case of new construction nuclear power plants, a digital main control room (MCR) will be applied, so the demand for digital devices applied to nuclear power plants is It is expected to increase day by day. This change is eventually emerging as a necessity for verification and development of digital products.

Accordingly, for new and modified digital facilities used in nuclear power plants, Article 15 (Rules on the Technical Standards for Nuclear Reactor Facilities Safety-related Measurements and Electrical Equipment for Nuclear Reactor Facilities, etc.), Article 40 Qualification must be performed to verify the safety of equipment and parts in accordance with Articles (Use of Performance Verification Parts) and Article 70 (Design Management).

Nuclear electromagnetic compatibility verification presents requirements for the scope of application of equipment, electromagnetic environment conditions and obstacle mechanisms, electromagnetic compatibility verification methods, records and documents, and devices subject to safety-related digital and analog signal verification have malfunctions in input/output processing functions. , Inadequate recovery function, input voltage and frequency fluctuations, positive simultaneous maximum signal change, electromagnetic interference (EMI), electrostatic discharge (ESD). And should be tested.

On the other hand, looking at the current status of emergency shutdowns of domestic nuclear power plants at the Korea Hydro & Nuclear Power Information Disclosure Center in 2018, electrical factors and measurement control causes account for about 40% to 60% of the total number of emergency shutdowns. Looking at the current status of emergency stop and malfunction as the cause of such electric/measurement control, it can be seen that a breakdown due to high noise and unsafe grounding at the power plant site is occurring.

As a conventional technique related to such noise removal, “EMI filter device and its operation method” of Korean Patent Laid-Open Publication No. 10-2015-0078133 has been proposed, which includes: a transformer sensing CM noise among conductive EMI noise generated from a load; An operation amplification unit configured to output an inverted CM low frequency noise by removing a high frequency among the CM noise and compensating for a phase and a magnitude of the low frequency; And an injection unit for injecting the first CM noise obtained by removing the DC component and noise of the inverted CM low frequency noise into a power line (Line, Neutral), wherein the first CM noise is combined on the power line to cancel the EMI noise. To do.

However, such a conventional technology, like the existing EMI filter, has a disadvantage in that it requires repeated tests to find an application value, and when it is not applicable to mass-produced products, requires custom manufacturing, and requires effective positioning.

In addition, as other techniques for removing conventional noise, in the case of an insulation transformer for removing low-band harmonics (30Hz~10kHz), repeated tests are required to find the applied value, and the value is changed according to the power change, making optimization difficult. In addition, due to the large L value, efficiency decreases, heat, vibration, and noise are generated, and sudden voltage fluctuations occur when the load is changed instantaneously.

In order to solve the problems of the prior art as described above, the present invention effectively solves the electromagnetic noise generated at the power stage of high output equipment using high output power, such as a network cabinet used for nuclear power, and The purpose is to effectively cope with electromagnetic noise and to compensate for electrical instability.

Other objects of the present invention will be easily understood through the description of the following embodiments.

In order to achieve the above object, according to an aspect of the present invention, as a filter module installed at a power terminal of a high-power equipment to attenuate noise, a broadband noise generated by an electronic device using the power of the power terminal A passive filter module for attenuating; A noise detector for detecting narrow-band noise generated by an electronic device using power from the power supply terminal; An active filter module that generates a signal for generation of out-of-phase noise for narrow-band noise detected by the noise detector; And a noise canceling exchanger configured to receive a signal from the active filter module and apply the anti-phase noise to the power terminal.

The noise detector may include a core manufactured in a ring shape using a magnetic material; First and second coils wound on both sides of the core and connected to a power line of the power terminal; And the core is wound between portions of the first and second coils, respectively, and is connected to the active filter module, and applied to the first and second coils by an induction action of the first and second coils. It may include; a third coil for outputting a signal for detecting narrow-band noise for power.

The active filter module may include: a first fuse configured to block excessive current from flowing to a side where an electrical signal is input from the noise detector; A first ACCT configured to detect an AC signal passing through the first fuse; A converter converting an AC signal passing through the first ACCT into a DC signal; DCCT to detect the DC signal converted by the converter; DCPT for transforming the DC signal passing through the DCCT; An inverter converting the DC signal transformed by the DCPT into an AC signal; A second ACCT configured to sense an AC signal converted by the inverter; A second fuse installed to block excessive current from flowing through the output side of the second ACCT; And selecting a narrow-band noise from the noise detected by the noise detector, generating a signal for generation of out-of-phase noise for canceling the noise only at the corresponding frequency, and performing the control necessary to transmit it to the noise canceling exchange. Controller; may include.

The noise canceling exchanger comprises: a fourth coil connected to the active filter module and wound; And fifth and sixth coils respectively wound on both sides of the winding portion of the fourth coil and connected to the rear end of the noise detector from the power line of the power terminal.

According to the noise canceling hybrid filter module according to the present invention, a relatively low level of broadband noise is attenuated by using the advantages of the passive filter module, and switching noise (50/60Hz, 400Hz, 1kHz, 10kHz) selectively used in electronic devices is used. , 150kHz, etc.), the active filter module cancels the noise by generating an inverse phase for the narrow-band noise. For this reason, the existing active filter detects the total noise (150kHz~30MHz) in the designated section The need for high-level algorithm technology that can cope with the ever-changing noise is greatly improved, and the detection point is concentrated only on the switching noise used in electronic devices. It is possible to detect, and it has the effect of enabling sufficient response even with a low level algorithm.

1 is a block diagram illustrating a noise canceling hybrid filter module according to an embodiment of the present invention.
2 is a perspective view illustrating a noise detector in a noise canceling hybrid filter module according to an embodiment of the present invention.
3 is a block diagram illustrating an active filter module in a noise canceling hybrid filter module according to an embodiment of the present invention.
4 is a perspective view showing a noise canceling exchanger in a noise canceling hybrid filter module according to an embodiment of the present invention.
5 is a graph showing a low-frequency emission envelope for device verification of the noise canceling hybrid filter module according to the present invention.
6 is a graph showing a high frequency conducted emission envelope for device verification of the noise canceling hybrid filter module according to the present invention.
7 is a graph showing a magnetic field emission envelope for device verification of the noise canceling hybrid filter module according to the present invention.
8 is a graph showing a field emission envelope for device verification of the noise canceling hybrid filter module according to the present invention.
9 is a graph showing an operation envelope of a low-frequency conduction sensitive line for device verification of the noise canceling hybrid filter module according to the present invention.
10 is a graph showing a high-frequency conduction sensitive operation envelope for a power line for device verification of a noise canceling hybrid filter module according to the present invention.
11 is a graph showing a high-frequency conduction sensitive operation envelope for a power line for device verification of the noise canceling hybrid filter module according to the present invention.
12 is a graph showing an impulse signal waveform for device verification of the noise canceling hybrid filter module according to the present invention.
13 is a graph showing Damped Sinusoidal Transients for device verification of the noise canceling hybrid filter module according to the present invention.
14 is a graph showing a 100 kHz attenuated oscillation waveform for device verification of the noise canceling hybrid filter module according to the present invention.
15 is a graph showing a composite pulse and open circuit voltage waveform for device verification of the noise canceling hybrid filter module according to the present invention.
16 is a graph showing a composite pulse and short circuit current waveform for device verification of the noise canceling hybrid filter module according to the present invention.
17 is a graph showing an EFT pulse waveform for device verification of the noise canceling hybrid filter module according to the present invention.
18 is a graph showing an EFT burst pattern for device verification of the noise canceling hybrid filter module according to the present invention.

In the present invention, various changes may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, and should be understood in a way that includes all changes, equivalents, or substitutes included in the technical spirit and scope of the present invention, and may be modified in various other forms. And the scope of the present invention is not limited to the following examples.

Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings, and the same reference numerals are assigned to the same or corresponding components regardless of reference numerals, and redundant descriptions thereof will be omitted.

1 is a block diagram illustrating a noise canceling hybrid filter module according to an embodiment of the present invention.

Referring to FIG. 1, a noise canceling hybrid filter module 100 according to an embodiment of the present invention is installed at a power terminal of a high-output device that uses high-output power such as a network cabinet used for nuclear power plants to reduce noise. As a module, a passive filter module 110, a noise detector 120, an active filter module 130, and a noise canceling exchanger 140 may be included, and one end of the power lines 151 and 152 is connected to the NETZ/ Connect to L1 and L2 on the LINE side, and connect the other ends of the power lines 151 and 152 to L1' and L2' on the LOAD/LAST side corresponding to the electronic device requiring power.

The passive filter module 110 attenuates broadband noise generated by electronic devices using the power of the power terminal of the high output equipment using high output power, such as a network cabinet used for nuclear power plants, for example, a power line ( 151, 152) is installed on the power input side. The passive filter module 110 attenuates overall noise in, for example, 10 kHz to 100 MHz band, for this purpose, various conventionally known filters for broadband noise reduction may be used.

The noise detector 120 detects narrow-band noise generated by an electronic device using power from the power supply terminal, and may be installed at the rear end of the passive filter module 110 in the power lines 151 and 152 for this purpose. The noise detector 120 is an equipment that detects narrow-band noise generated from electronic devices, monitors the generated power, searches for the generated harmonics by harmonic band, and the converter of the active filter module 130 to be described later. Noise reduction can be achieved by applying a power device of a desired frequency band by an inverter.

Referring to FIG. 2, the noise detector 120 is a core 121 manufactured in a ring shape using, for example, a magnetic material by iron core or iron particle molding, and a plurality of windings on both sides of the core 121, respectively, The first and second coils 122 and 123 connected to the power lines 151 and 152 of the stage, and the first and second coils 122 and 123 of the core 121 are wound at each part of the core 121, thereby winding the first and second coils. The first and second coils 122 and 123 are respectively wound on both sides of the core 121 partitioned by the coils 122 and 123 and connected to the active filter module 130, and the first and second coils 122 and 123 by induction action of the first and second coils 122 and 123 ) May include a third coil 124 for outputting a signal for detecting narrow-band noise for power applied to ). Here, the characteristics and specifications of the core 121, the characteristics of the first to third coils 122, 123, 124, and the number of windings are calculated by formulas determined to be suitable for obtaining the induced current required for noise measurement in the power lines 151 and 152. However, it may be determined according to the results obtained by simulation or experimentally. Here, the narrow-band noise may mean a case where the bandwidth (B) occupied by the signal is much smaller than the carrier frequency (fc) (B << fc).

The active filter module 130 generates a signal for generation of out-of-phase noise for narrow-band noise detected by the noise detector 120, and an active EMI filter may be used.

Referring to FIG. 3, the active filter module 130 includes, for example, a first fuse for blocking excessive current from flowing to a side where an electrical signal is input from the noise detector 120, as in this embodiment, and a first fuse. 1 A first ACCT (AC Current Transformer) that detects an AC signal passing through the fuse, a converter that converts the AC signal passing through the first ACCT into a DC signal, and the DC converted by the converter DCCT (DC Current Transformer) that detects a signal, DC Potential Transformer (DCPT) that transforms the DC signal that has passed through the DCCT, and converts the DC signal transformed by the DCPT into an AC signal. A second ACCT configured to detect an AC signal converted by the inverter, a second fuse installed to block excessive current from flowing to the output side of the second ACCT, and a noise detector 120 A controller that selects narrow-band noise from the detected noise, generates a signal for generation of out-of-phase noise to cancel the noise only at the corresponding frequency, and performs the control necessary to transmit it to the noise canceling exchange (140). ) Can be included. Here, the controller determines the narrow-band noise from the output signal of the noise detector 120, and allows the out-of-phase noise for attenuating the narrow-band noise to be applied through the noise canceling exchanger 140. Can be obtained experimentally or by predetermined calculations or simulations.

The noise canceling exchanger 140 receives the signal from the active filter module 130 and applies the out-of-phase noise to the power supply terminal.

Referring to FIG. 4, the noise canceling exchanger 140 is connected to the active filter module 130, and is wound on both sides of the winding portion of the fourth coil 141 and the fourth coil 141, respectively. And the fifth and sixth coils 142 and 143 connected to the rear end of the noise detector 120 from the power lines 151 and 152 of the power supply terminal. Here, the characteristics or the number of windings of the fourth to sixth coils 141, 142, and 143 may be determined by calculation, simulation, or experiment determined so as to provide a desired anti-phase noise through a signal of the active filter module 130.

The present invention having such a configuration requires soundness through device verification, and a test for this will be described.

As a test for conducted emission and low frequency (CE101), the amount of conducted emission in the low frequency range of 30Hz ~ 10kHz is measured in the power line of the equipment and auxiliary system. When carrying out this test, it is applied to AC and DC power lines, including ground and neutral, that are powered from sources other than those of electronic equipment, for example, EUT (Equipment Under Test). The amount of conducted emission from the power line should not exceed the rms value (rms) shown in FIG. 5. Different envelopes (1kVA or less and 1kVA or more) were given based on the power consumption of the AC-powered device. For AC power devices having a basic current of 1A or more, the curve may be relaxed as shown in FIG. 5.

Conducted emission, high frequency test (CE102), measures the amount of conducted emission in the high frequency range of 10 kHz to 2 MHz in the power line of the equipment and auxiliary system. This test applies to AC and DC power lines, including ground and neutral, that are powered from sources other than part of the EUT. The amount of conducted emission from the power line should not exceed the rms value (rms) shown in FIG. 6. These values were specified according to the voltage level supplied to the EUT.

As a test for radiated emission and magnetic field (RE101), Measure the amount of radiated magnetic field emission in the frequency range of 30Hz to 100kHz. Equipment not installed in areas with other equipment sensitive to magnetic fields may be exempt from this test. This test is applied to measure the emission from all connecting wires, as well as the enclosures of equipment and subsystems. The amount of magnetic field emission should not exceed the radiation level shown in FIG. 7. The magnetic field emission is measured at a distance of 7 cm and compared to the reference envelope.

As a test for radiated emission and electric field (RE102), the amount of radiated electric field emission is measured in the frequency range of 2MHz to 1GHz. Also, this test applies to frequencies above 1 GHz. This test is applied to measure the emissions from all connecting wires, as well as the enclosures of equipment and subsystems. The field emission should not exceed the effective value shown in FIG. 8. At frequencies above 30 MHz, test methods for both horizontal and vertical deflection fields should be performed.

Conducted sensitivity test, low frequency test (CS101), confirms that the equipment and auxiliary systems are not sensitive to EMI/RFI in the frequency range of 30Hz ~ 150kHz generated from the power line. This test is carried out at AC and DC input terminals and does not include ground and neutral points. If the EUT is for direct current, perform the test in the frequency range from 30Hz to 150kHz. If the EUT is for alternating current, it starts at the second harmonic of the frequency of the power line and extends the frequency range to 150 kHz. When the EUT receives the test signal of the RMS voltage specified in Fig. 9, any malfunction or performance should not fall below the specified operating deviation. Alternative envelopes have been presented for equipment with a nominal voltage of 28 V or less and for equipment with a nominal voltage of 28 V or more.

Conducted susceptibility test, high frequency test (CS114), including 10 kHz to 30 MHz, and applied to all connected lines including EUT power lines. Although this test can be applied to assess the sensitivity of signal lines, the test levels presented in this section apply only to power and control lines. When the EUT receives the test signal of the RMS value shown in Fig. 10, any malfunction or performance shall not fall below the specified operating deviation.

As a radiation sensitivity test, a magnetic field test (RS101), it is confirmed that the equipment and auxiliary systems are not sensitive to the radiation magnetic field in the frequency range of 30 Hz to 100 kHz. This test applies to the appliance, subsystems and all connected cables. This test does not apply to electromagnetic field coupling via an antenna. When the EUT receives the effective magnetic field value shown in Fig. 11, any malfunction or performance should not fall below the specified operating deviation.

As a radiation susceptibility test, electric field test (RS103), it is confirmed that the equipment and auxiliary systems are not sensitive to the radiation electric field in the frequency range of 30 MHz to 1 GHz. This test can also be applied at frequencies above 1 GHz. This test applies to the appliance, subsystems and all connected cables. This test is not applied at the regulated frequencies of the receiver connected to the antenna unless otherwise specified. When the EUT is subjected to a radiated electric field, any malfunction or performance shall not fall below the specified operating deviation. The applied electric field level shall be 10 V/m (rms) when measured according to the technique specified in the RS103 test method. This test method shall be performed for both horizontal and vertical deflection fields.

As a conduction immunity test (RS115), it is conducted to confirm the resistance of the EUT due to the impulsive signal induced by each connection cable, and a waveform is shown on the impulsive signal in FIG. 12.

As a conduction immunity test (RS116), it is conducted to confirm the immunity of the EUT due to the damped sinusoidal transients induced by each connection cable in the frequency range of 10 kHz to 100 MHz (see Fig. 13).

As a surge immunity test, it is conducted to confirm the resistance of the EUT against surges that may be caused by overvoltage due to switching and lightning (see FIGS. 14 to 16).

As an electrical fast transient immunity test (Electrically Fast Transients / Burst), it is conducted to confirm the resistance of the EUT to mutual interference phenomena arising from switching transients (blocking of floating loads, relay contact moments, etc.) (Fig. 17). And Fig. 18).

As an immunity test against electrostatic discharge (ESD), it is conducted to verify the resistance of the EUT against static electricity discharged from objects near the EUT.

With respect to such a test for device verification, it can be seen that the noise canceling hybrid filter module 100 according to the present invention obtains satisfactory results, thereby obtaining reliability of power supply.

According to the noise canceling hybrid filter module according to the present invention, a relatively low level of broadband noise is attenuated by using the advantages of the passive filter module (10dB to 60dB overall attenuation in the 10kHz to 100MHz band), and selectively in electronic devices. For switching noise (50/60Hz, 400Hz, 1kHz, 10kHz, 150kHz, etc.) used as an active filter module, the noise is canceled by generating an inverse phase for the narrow-band noise. By detecting the total noise (150kHz~30MHz) in the specified section, it has greatly improved the need for high-performance IC circuits and high-level algorithm technology that can respond to the ever-changing noise. By focusing the tecting points, quick detection is possible even with IC circuits with lower performance than the standard, and sufficient response is possible with low-level algorithms. However, according to the present invention, noise other than a fixed switching frequency is not involved, and only a general passive filter is operated.

As described above, the present invention has been described with reference to the accompanying drawings, but, of course, various modifications and variations can be made without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims and equivalents as well as the claims to be described later.

110: passive filter module 120: noise detector
121: core 122: first coil
123: second coil 124: third coil
130: active filter module 140: noise canceling exchanger
141: fourth coil 142: fifth coil
143: sixth coil 151,152: power line

Claims (4)

As a filter module installed at the power stage of high-power equipment to attenuate noise,
A passive filter module for attenuating broadband noise generated by an electronic device using the power of the power supply terminal;
A noise detector for detecting narrow-band noise generated by an electronic device using power from the power supply terminal;
An active filter module that generates a signal for generation of out-of-phase noise for narrow-band noise detected by the noise detector; And
Including; a noise canceling exchanger for receiving the signal from the active filter module and applying the reverse phase noise to the power terminal,
The noise detector,
A core manufactured in a ring shape using a magnetic material;
First and second coils wound on both sides of the core and connected to a power line of the power terminal; And
The core is wound between portions of each of the first and second coils, thereby being wound on both sides of the core partitioned by the first and second coils, respectively, and connected to the active filter module, and the first And a third coil configured to output a signal for detecting narrow-band noise for power applied to the first and second coils by an induction action of the second coil; and
The noise canceling exchanger,
A fourth coil connected to the active filter module and wound; And
Fifth and sixth coils respectively wound on both sides of the winding portion of the fourth coil and arranged parallel to each other, and connected to the rear end of the noise detector at the power line of the power supply terminal;
Containing, noise canceling hybrid filter module. delete The method according to claim 1,
The active filter module,
A first fuse to block excessive current from flowing from the noise detector to a side to which an electrical signal is input;
A first ACCT configured to detect an AC signal passing through the first fuse;
A converter converting an AC signal passing through the first ACCT into a DC signal;
DCCT to detect the DC signal converted by the converter;
DCPT for transforming the DC signal passing through the DCCT;
An inverter converting the DC signal transformed by the DCPT into an AC signal;
A second ACCT configured to sense an AC signal converted by the inverter;
A second fuse installed to block excessive current from flowing through the output side of the second ACCT; And
A controller that selects narrow-band noise from the noise detected by the noise detector, generates a signal for generation of out-of-phase noise to cancel the noise only at the corresponding frequency, and transmits the signal to the noise canceling exchange. ;
Comprising a noise canceling hybrid filter module. delete

Images