Active compensation device for providing electromagnetic noise data

Abstract

To provide an active compensation device for actively compensating noise generated in a common mode in each of at least two or more large current paths.SOLUTION: The active compensation device 100 includes a sensing unit 120 configured to generate an output signal corresponding to a common mode noise signal on a high current path, an IC unit 500 including an amplification unit configured to output an amplification signal amplified from the output signal and a digital circuit unit configured to output noise data digitally converted from the output signal, and a compensation unit 140 configured to draw a compensation current from the high current path or generate a compensation voltage on the high current path based on the amplification signal. The noise data is provided to an external device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an active compensation device that compensates for noise current and / or noise voltage that occurs in common mode on two or more large current paths connecting two devices. [Background technology]

[0002] Generally, electrical devices such as home appliances, industrial appliances, and electric vehicles emit noise during operation. For example, noise can be emitted through power lines due to the switching operation of a power converter within an electronic device. If left unchecked, this noise can not only be harmful to humans, but can also cause malfunctions or failures in surrounding components and other electronic devices. The electromagnetic interference that electronic devices cause to other devices is called EMI (Electromagnetic Interference), and in particular, noise transmitted via wires and circuit board wiring is called conducted emission (CE) noise.

[0003] To ensure that electronic devices operate without damaging peripheral components and other devices, EMI noise emissions from all electrical products are strictly regulated. Therefore, most electrical products must include noise reduction devices (e.g., EMI filters) to reduce EMI noise currents in order to comply with noise emission regulations. For example, EMI filters are essential in white goods such as air conditioners, electric vehicles, aviation, and energy storage systems (ESS). Conventional EMI filters use common mode chokes (CM chokes) to reduce common mode (CM) noise, a type of conducted emission (CE) noise. Common mode (CM) chokes are passive filters that suppress common mode noise currents.

[0004] On the other hand, in high-power / high-current systems, to prevent magnetic saturation of the common mode choke and maintain noise reduction performance, the size or number of common mode chokes must be increased, which poses a problem of significantly increasing the size and cost of EMI filters for high-power products. Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been increasing interest in developing active EMI filters that compensate for noise with the current / voltage generated through an amplifier in order to overcome the drawbacks of passive EMI filters as described above.

[0006] However, in the case of existing active EMI filters, EMI noise is only compensated for by current / voltage compensation, making it fundamentally difficult to collect information about the noise.

[0007] The present invention has been made to alleviate the above problems, and has an object to provide an active compensation device that can provide information about EMI noise as digital noise data.

[0008] However, the above problems are merely examples, and the scope of the present invention is not limited thereto. [Means for solving the problem]

[0009] According to an embodiment of the present invention, an active compensation device for actively compensating for common-mode noise generated in each of at least two or more large current paths includes: an IC unit including a sensing unit that generates an output signal corresponding to a common-mode noise signal on the large current path; an amplifier unit that amplifies the output signal and outputs an amplified signal; and a digital circuit unit that outputs noise data that has been digitally converted from the output signal; and a compensation unit that draws a compensation current from the large current path or generates a compensation voltage on the large current path based on the amplified signal, and the noise data may be provided to an external device.

[0010] According to one embodiment, the IC unit may consist of one IC chip, and the one IC chip may include an input terminal for receiving an output signal of the sensing unit, a first output terminal for outputting the amplified signal, and a second output terminal for outputting the noise data.

[0011] According to one embodiment, the digital circuitry may include an analog-to-digital converter and an input buffer that receives the output signal and attenuates it to a low-voltage analog signal that can be used by the analog-to-digital converter.

[0012] According to one embodiment, the IC unit may further include a voltage controlled oscillator for independently generating a clock signal for controlling an internal circuit of the analog-to-digital conversion unit.

[0013] According to one embodiment, the IC section may control the operation of the amplifier section based on the digital signal generated by the digital circuit section or the noise data.

[0014] According to one embodiment, the IC unit may include a first digital circuit unit that digitally converts an input signal of the amplifier unit to generate first noise data, and a second digital circuit unit that digitally converts an output signal of the amplifier unit to generate second noise data.

[0015] Further aspects, features, and advantages will become apparent from the accompanying drawings, the claims, and the following detailed description of the invention. [Effects of the Invention]

[0016] According to various embodiments of the present invention configured as described above, an active EMI filter can be used to cancel EMI noise while collecting EMI noise data.

[0017] According to various embodiments of the present invention, noise data can be extracted and collected from an active EMI filter and utilized for various applications. For example, noise data output from an active EMI filter according to embodiments of the present invention can be monitored to monitor for status changes or emergency situations. The noise data can also be utilized for big data processing.

[0018] Of course, the scope of the present invention is not limited to such effects. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a diagram illustrating a schematic configuration of a system including an active compensation device 100 according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating a more specific example of the embodiment shown in FIG. 1, and is a diagram illustrating an active compensation device 100A according to one embodiment of the present invention. [Figure 3] 5 is a diagram illustrating a specific example of an IC unit 500 according to various embodiments of the present invention. [Figure 4] FIG. 5 illustrates an input buffer 510-1 as an example of an input buffer 510 in one embodiment. [Figure 5] FIG. 5 is a diagram illustrating an input buffer 510-2 as another example of the input buffer 510 according to an embodiment. [Figure 6] FIG. 2 is a diagram illustrating an example of an analog-to-digital conversion unit 520 according to an embodiment. [Figure 7]FIG. 3 is a diagram illustrating a more specific example of the embodiment shown in FIG. 2, and is a diagram illustrating an active compensation device 100A-1 according to one embodiment of the present invention. [Figure 8] FIG. 2 is a diagram illustrating a more specific example of the embodiment shown in FIG. 1, and is a diagram illustrating an active compensation device 100B according to one embodiment of the present invention. [Figure 9] FIG. 10 is a diagram illustrating an active compensation device 100C according to another embodiment of the present invention. [Figure 10] FIG. 10 is a diagram illustrating an active compensation device 100D according to yet another embodiment of the present invention. [Figure 11] FIG. 2 is a diagram illustrating a more specific example of the embodiment shown in FIG. 1, and is a diagram illustrating an active compensation device 100E according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] According to an embodiment of the present invention, an active compensation device for actively compensating for common-mode noise generated in each of at least two or more large current paths includes: a sensing unit for generating an output signal corresponding to a common-mode noise signal on the large current path; an amplifier unit for amplifying the output signal and outputting an amplified signal; an IC unit including a digital circuit unit for outputting noise data obtained by digital conversion of the output signal; and a compensation unit for drawing a compensation current from the large current path or generating a compensation voltage on the large current path based on the amplified signal, wherein the noise data may be provided to an external device.

[0021] The present invention can be modified in various ways and has various embodiments, so specific embodiments are illustrated in the drawings and described in detail in the detailed description. The advantages and features of the present invention, as well as methods for achieving them, will become apparent by referring to the embodiments described in detail below in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below, and can be realized in various forms.

[0022] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the drawings, the same or corresponding components will be given the same reference numerals, and duplicate descriptions thereof will be omitted.

[0023] In the following embodiments, terms such as first and second are not used in a limiting sense but are used to distinguish one component from another.

[0024] In the following embodiments, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0025] In the following embodiments, terms such as "comprise" and "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added.

[0026] In the drawings, the size of components may be exaggerated or reduced for the sake of convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for the sake of convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings.

[0027] In the following embodiments, when a component, part, block, module, etc. is said to be connected, it does not only mean that the component, part, block, module, etc. are directly connected, but also means that the component, part, block, module, etc. are indirectly connected via another component, part, block, module, etc.

[0028] 1 is a diagram illustrating a schematic configuration of a system including an active compensation device 100 according to an embodiment of the present invention. The active compensation device 100 is configured to detect a noise current I generated in common mode (CM) on two or more large current paths 111 and 112 from a first device 300. n (e.g., EMI noise current) and / or noise voltage (e.g., EMI noise voltage) can be actively compensated for.

[0029] Referring to FIG. 1, the active compensation device 100 may include a sensing unit 120, an IC unit 500, and a compensation unit 140.

[0030] In this specification, the first device 300 may be any of various types of devices that use the power source supplied by the second device 200. For example, the first device 300 may be a load that is driven by the power source supplied by the second device 200. Alternatively, the first device 300 may be a load (e.g., an electric vehicle) that stores energy using the power source supplied by the second device 200 and is driven by the stored energy. However, the first device 300 is not limited thereto.

[0031] In this specification, the second device 200 may be a device of various types for supplying power to the first device 300 in the form of current and / or voltage. For example, the second device 200 may be a device that generates and supplies power, or a device that supplies power generated by another device (e.g., an electric vehicle charging device). Of course, the second device 200 may also be a device that supplies stored energy. However, the present invention is not limited thereto. A power conversion device may be located on the side of the first device 300. For example, a common-mode noise current I may be generated by the switching operation of the power conversion device. n may occur on the large current paths 111 and 112. As another example, a noise current leaking from the first device 300 side may flow into the large current paths 111 and 112 via the second device 200 via the ground (e.g., reference potential 1), causing the noise current I n may occur.

[0032] Noise current I occurs in the same direction on the large current paths 111 and 112 n can be said to be the common mode noise current. Also, the common mode noise voltage V n may be a voltage generated between the ground (for example, reference potential 1) and the large current paths 111 and 112, instead of a voltage generated between the large current paths 111 and 112.

[0033] For example, the first device 300 side may correspond to a noise source, and the second device 200 side may correspond to a noise receiver.

[0034] The two or more large current paths 111, 112 may be paths that transmit the power supplied by the second device 200, i.e., the large currents I21, I22, to the first device 300, but may also be power lines, for example. For example, each of the two or more large current paths 111, 112 may be a live line and a neutral line. At least a portion of the large current paths 111, 112 may pass through the compensation device 100. The large currents I21, I22 may be AC ​​currents having a frequency in a second frequency band. The second frequency band may be, for example, a 50 Hz to 60 Hz band.

[0035] In addition, the two or more large current paths 111 and 112 are connected to the first device 300 side to receive the noise current I n to the second device 200. Alternatively, the noise voltage V n may be a route through which

[0036] Noise current I n or noise voltage V n may be input in common mode to each of the two or more large current paths 111 and 112. n may be a current that is unintentionally generated in the first device 300 due to various causes. For example, the noise current I n may be a noise current due to a parasitic capacitance between the first device 300 and the surrounding environment. n may be a noise current generated by the switching operation of the power conversion device of the first device 300. n and noise voltage V nmay have a frequency in a first frequency band. The first frequency band may be a frequency band higher than the second frequency band. The first frequency band may be, for example, a band of 150 KHz to 30 MHz.

[0037] In the figure, the noise current I n and noise voltage V n is shown at a node between the first device 300 and the sensing unit 120 on the high current paths 111, 112, however, in this document the terms "noise current" and "noise voltage" are not limited thereto and can refer to voltages and currents occurring in common mode at the first frequency throughout the high current paths 111, 112.

[0038] 1, the two or more high current paths 111, 112 may include two paths, three paths (e.g., a three-phase, three-wire power system), or four paths (e.g., a three-phase, four-wire power system). The number of high current paths 111, 112 may vary depending on the type and / or form of the power source used by first device 300 and / or second device 200.

[0039] The sensing unit 120 detects noise currents I on two or more large current paths 111 and 112. n and detects the noise current I n That is, the sensing unit 120 can generate an output signal corresponding to the noise current I on the large current paths 111 and 112. n The sensing unit 120 detects the noise current I n Although at least a part of the large current paths 111 and 112 can pass through for sensing, a part of the sensing unit 120 where an output signal is generated by sensing may be insulated from the large current paths 111 and 112. For example, the sensing unit 120 may be realized by a sensing transformer. The sensing transformer is insulated from the large current paths 111 and 112 and is configured to transform the noise current I on the large current paths 111 and 112. n can be detected.

[0040] The IC unit 500 is electrically connected to the sensing unit 120 and can generate a compensation signal S1 corresponding to an amplified signal of the output signal output by the sensing unit 120, and can also generate noise data S2 corresponding to a digital signal of the output signal. In the present invention, "amplification" can mean adjusting the magnitude and / or phase of the signal to be amplified. The IC unit 500 can be realized by various means and can include active elements.

[0041] According to various embodiments of the present invention, the IC unit 500 can output a compensation signal S1 for canceling noise to the compensation unit 140 and output digital data S2 indicating the noise to the outside.

[0042] In various embodiments of the present invention, the IC unit 500 may include a circuit that converts the output signal (i.e., the analog signal corresponding to noise) output from the sensing unit 120 into a digital signal. In various embodiments, the IC unit 500 may output noise data S2 generated based on the digital signal to the outside. The IC unit 500 may also include an amplifier that amplifies the output signal (i.e., the analog signal corresponding to noise) output from the sensing unit 120. The IC unit 500 may output the analog signal amplified by the amplifier to the compensation unit 140 as a compensation signal S1. An example of a detailed configuration of the IC unit 500 will be described later with reference to FIGS. 3 to 6.

[0043] For example, the noise data S2 output from the active compensation device 100 may be transmitted to and stored in a data storage device or transmitted to a waveform display device. For example, the noise data S2 may be monitored to monitor for state changes or emergency situations. The noise data S2 may also be utilized in big data processing or artificial intelligence techniques.

[0044] Meanwhile, the IC unit 500 may amplify the output signal output from the sensing unit 120 and generate the amplified current / voltage as the compensation signal S1 by receiving power supply from a third device 400 distinct from the first device 300 and / or the second device 200, and may generate noise data S2 based on the output signal. Here, the third device 400 may be a device that generates input power for the IC unit 500 by receiving power supply from a power source independent of the first device 300 and the second device 200. Alternatively, the third device 400 may be a device that generates input power for the IC unit 500 by receiving power supply from either the first device 300 or the second device 200.

[0045] The IC unit 500 can output the amplified voltage or amplified current as a compensation signal S1 to the compensation unit 140. The compensation signal S1 is input to the compensation unit 140. The compensation unit 140 can generate a compensation voltage or a compensation current based on the input compensation signal (amplified voltage or amplified current).

[0046] According to an embodiment, the compensating unit 140 may generate a compensation voltage in series on the large current paths 111 and 112 based on the amplified voltage output from the IC unit 500. The output side of the compensating unit 140 may generate a compensation voltage in series on the large current paths 111 and 112, but may be insulated from the IC unit 500. For example, the compensating unit 140 may be formed of a compensation transformer for the insulation. For example, a compensation signal output from the IC unit 500 may be applied to the primary side of the compensating transformer, and a compensation voltage based on the compensation signal may be generated on the secondary side of the compensating transformer. The compensation voltage is generated by amplifying the noise current I flowing in the large current paths 111 and 112. n In this case, the compensating unit 140 may correspond to voltage compensation. The voltage compensation will be described in detail later with reference to FIGS.

[0047] According to another embodiment, the compensation unit 140 may generate a compensation current based on the amplified current output from the IC unit 500. The compensation current may be injected into or extracted from the large current paths 111 and 112 to reduce the noise current I n In this case, the compensating unit 140 may correspond to current compensation. A detailed description of current compensation will be given later with reference to FIGS. 8, 9, and 10. Meanwhile, the output side of the compensating unit 140 may be connected to the large current paths 111 and 112 to pass the compensation current through the large current paths 111 and 112, but may be isolated from the IC unit 500. For example, the compensating unit 140 may include a compensation transformer for the isolation.

[0048] The compensator 140 may be a feedforward type that compensates for noise input from the first device 300 at a previous stage on the power supply side. However, the present invention is not limited thereto, and the active compensation apparatus 100 may include a feedback type compensator that returns noise to a subsequent stage for compensation (see FIG. 9).

[0049] Fig. 2 is a diagram illustrating a more specific example of the embodiment shown in Fig. 1, and is a schematic diagram illustrating an active compensation device 100A according to an embodiment of the present invention. The active compensation device 100A may include a sensing unit 120A, an IC unit 500, and a compensation unit 140A.

[0050] 2 and the following figures, reference potential (reference potential 2) 602 of first device 300, second device 200, third device 400, and IC unit 500 may be omitted. That is, large current paths 111 and 112 in the upstream stage (e.g., on the compensation unit 140A side) of active compensation apparatus 100A may be connected to the power line of second device 200, and large current paths 111 and 112 in the downstream stage (e.g., on the sensing unit 120A side) may be connected to the power line of first device 300. Furthermore, although not shown, IC unit 500 can drive its internal active elements by power supply from third device 400.

[0051] According to one embodiment, the sensing unit 120 may include a sensing transformer 120A.

[0052] The sensing transformer 120A is insulated from the large current paths 111 and 112 and detects the noise current I n or noise current I n The voltage induced across the sensing transformer 120A (e.g., V choke ) may be a means for detecting

[0053] The sensing transformer 120A may include a primary side 121 disposed on the large current paths 111 and 112, and a secondary side 122 connected to the input terminal of the IC unit 500. The sensing transformer 120A detects a noise current I n Based on the magnetic flux density induced by the sen The primary side 121 of the sensing transformer 120A may be, for example, a winding in which the first large current path 111 and the second large current path 112 are wound around one core.

[0054] Specifically, the sensing transformer 120A detects the noise current I on the first large current path 111 (e.g., live line). n and the noise current I on the second large current path 112 (e.g., neutral line). n The sensing transformer 120A may be configured so that the magnetic flux densities induced by the large current I21 and the large current I22 in the first large current path 111 and the second large current path 112 overlap (or reinforce) each other. Here, large currents I21 and I22 also flow through the large current paths 111 and 112, but the magnetic flux density induced by the large current I21 in the first large current path 111 and the magnetic flux density induced by the large current I22 in the second large current path 112 may be configured so that they cancel each other out. Also, for example, the sensing transformer 120A may be configured to detect the noise current I21 in the first frequency band (for example, a band having a range of 150 KHz to 30 MHz). nThe magnitude of the magnetic flux density induced by the large currents I21 and I22 in the second frequency band (for example, a band having a range of 50 Hz to 60 Hz) may be configured to be larger than the magnitude of the magnetic flux density induced by the large currents I21 and I22 in the second frequency band (for example, a band having a range of 50 Hz to 60 Hz).

[0055] In this way, the sensing transformer 120A is configured so that the magnetic flux densities induced by the large currents I21 and I22 cancel each other out, and the noise current I n That is, only the voltage V induced on the secondary side 122 of the sensing transformer 120A can be detected. sen is the noise current I n The induced voltage on the primary side 121 (e.g., V choke ) may be a voltage converted at a predetermined ratio.

[0056] The induced voltage V induced on the secondary side of the sensing transformer 120A sen may be input as an input signal to the IC unit 500. That is, the input signal to the IC unit 500 may be a noise current I n or noise voltage V n It may be a signal proportional to

[0057] The IC unit 500 may include an amplifier unit 130 and a digital circuit unit 501. A signal input to the IC unit 500 may be input to both the amplifier unit 130 and the digital circuit unit 501.

[0058] The amplifier 130 receives an input signal (e.g., V sen ) and output it as the compensation signal S1. sen ) and outputs noise data S2. Detailed configuration examples of the IC section 500 and the digital circuit section 501 will be described later with reference to FIGS.

[0059] In the present invention, "amplification" by the amplifier unit 130 may mean adjusting the magnitude and / or phase of the signal to be amplified. The amplifier unit 130 may be realized by various means and may include active elements. In one embodiment, the amplifier unit 130 may include a BJT (Bipolar Junction Transistor). For example, the amplifier unit 130 may include multiple passive elements such as resistors and capacitors in addition to the BJT. However, the present invention is not limited thereto, and any means for "amplification" described in the present invention may be used without limitation as the amplifier unit 130 of the present invention.

[0060] On the other hand, the reference potential (reference potential 2) 602 of the IC section 500 and the reference potential (reference potential 1) 601 of the compensation device 100 may be potentials that are distinct from each other.

[0061] According to one embodiment, the aforementioned compensation section 140 may include a compensation transformer 140A.

[0062] The compensation transformer 140A can insulate the passive element IC unit 500 from the large current paths 111 and 112. The compensation transformer 140A applies a compensation voltage V to the large current paths 111 and 112 based on a compensation signal S1 output from the IC unit 500 while being insulated from the large current paths 111 and 112. inj1 and may be a means for compensating the voltage.

[0063] The compensation transformer 140A may have a structure in which, for example, the wire of the primary side 141 and the wire of the secondary side 142 pass through one core or are wound at least once around one core. The wire of the primary side 141 is a wire through which the compensation signal S1 output from the IC unit 500 flows, and the wire of the secondary side 142 may correspond to the large current paths 111 and 112.

[0064] The compensation transformer 140A generates a compensation voltage V on the large current paths 111 and 112 on the secondary side 142 based on the amplified voltage generated on the primary side 141. inj1 can be induced.

[0065] Meanwhile, the active compensation device 100A according to an embodiment of the present invention may further include a decoupling capacitor unit 170.

[0066] The decoupling capacitor section 170 may be arranged, for example, between the sensing section 120 and the first device 300, and may be composed of two Y capacitors, one end of which is connected to the reference potential 1601 and the other end of which is connected to the large current paths 111 and 112, respectively.

[0067] 3 is a diagram illustrating a specific example of an IC unit 500 according to various embodiments of the present invention. Referring to FIG. 2 and FIG. 3, the IC unit 500 according to the embodiment of the present invention may include an amplifier unit 130 and a digital circuit unit 501. The digital circuit unit 501 may convert an analog signal, which is an input signal of the IC unit 500, into digital noise data S2, and may include an input buffer 510 and an analog-to-digital converter 520.

[0068] The IC unit 500 may further include a linear regulator 550 and a voltage controlled oscillator (VCO) 560. The linear regulator 550 may generate a DC low voltage for driving active elements within the IC unit 500. The voltage controlled oscillator 560 may generate a clock signal for controlling the internal circuitry of the analog-to-digital conversion unit 520.

[0069] The IC unit 500 may be physically one IC chip. According to this embodiment, the digital noise data S2 and the compensation signal S1 as described above may be generated from one IC chip. That is, the configuration for generating the noise data S2 (e.g., the digital circuit unit 501) and the amplifier unit 130 for generating the compensation signal S1 may be realized on one IC chip. However, this is only one embodiment, and in other embodiments, the configuration for generating the noise data and the configuration for generating the compensation signal may be realized on one or more different chips or packages.

[0070] The IC unit 500 may include an input terminal VIN for receiving an output signal from the sensing unit 120, a first output terminal VOUT for outputting the compensation signal S1, and a second output terminal VOUT2 for outputting digital noise data S2.

[0071] As described above, the sensing unit 120 detects the noise signal (I n or V n ) and generates an output signal corresponding to the noise signal. The output signal output from the sensing unit 120 becomes an input signal to the IC unit 500.

[0072] The output signal of the sensing unit 120 may be input via the input terminal VIN of the IC unit 500, and then input to the amplifier unit 130 and the input buffer 510 of the digital circuit unit 501 within the IC unit 500, respectively.

[0073] The amplifier unit 130 can amplify an analog input signal. The amplified analog signal may be output as a compensation signal S1 via a first output terminal VOUT. The compensation signal S1 output via the first output terminal VOUT may be input to the compensation unit 140. Since the compensation signal S1 must be sufficiently large, the output voltage of the amplifier unit 130 may be designed to correspond to approximately 12 V, but the present invention is not limited thereto.

[0074] On the other hand, the signal input via the input terminal VIN of the IC section 500 may also be input to a digital circuit section 501 including an input buffer 510 and an analog-to-digital conversion section 520 .

[0075] According to one embodiment, the noise signal input to the input buffer 510 of the digital circuit unit 501 may have a high voltage swing of 10 V or more. Therefore, for example, the input buffer 510 may be a high-swing DMOS having sufficient voltage resistance and performance.

[0076] Fig. 4 is a diagram showing input buffer 510-1 as an example of input buffer 510 in one embodiment, and Fig. 5 is a diagram showing input buffer 510-2 as another example of input buffer 510 in one embodiment. In the following, a description of input buffer 510 may include a description of input buffers 510, 510-1, and 510-2.

[0077] Since the input noise signal may be a high-voltage signal of 10 V or more, the input buffers 510, 510-1, and 510-2 may be high-voltage (HV) input buffers. For example, the target withstand voltage of the input buffer 510 may be 12 V, the input impedance may be 100 kohm or more, and the bandwidth (BW) may correspond to approximately 30 MHz. However, the present invention is not limited thereto.

[0078] The input buffer 510 can minimize distortion of the input signal and act as an attenuator that attenuates the input signal to a low-voltage analog signal that can be used by the ADC 520. That is, the input buffer 510 can, for example, reduce the amplitude of an input noise signal and output it to the ADC 520.

[0079] In one embodiment, as shown in FIG. 4, input buffer 510-1 may be configured with a multi-stage amplifier, and in another embodiment, as shown in FIG. 5, input buffer 510-2 may be configured with a single-stage inverting amplifier.

[0080] For example, for input buffer 510-2, when the input signal is V in If so, the output signal V o is as shown in the following formula 1.

number

[0081] Meanwhile, the attenuated signal output from the input buffer 510 may be input to an analog-to-digital converter (ADC) 520 of the digital circuit unit 501. The attenuated signal input to the analog-to-digital converter 520 may correspond to the EMI noise signal. Here, "corresponding" may mean that the magnitude of the EMI noise signal changes at a predetermined rate, but is not limited to this.

[0082] The analog-to-digital converter 520 can receive the attenuation signal, convert it into a digital signal, and output digital noise data S2 based on the digital signal.

[0083] 6 is a diagram illustrating an example of an analog-to-digital conversion unit 520 according to an embodiment. According to an embodiment, the analog-to-digital conversion unit 520 may include a converter circuit 521, a digital block 522, and / or an output buffer 523.

[0084] The converter circuit 521 can be said to be the data processing core of the analog-to-digital conversion unit 520. As an example, the converter circuit 521 may be configured with a flash ADC as shown in Fig. 6. The flash ADC can output a digital signal in a thermometer code format according to the magnitude of the input analog signal.

[0085] However, the converter circuit 521 is not limited to a flash ADC and may include, for example, a successive approximation register (SAR) ADC or a sigma-delta ADC, or may be configured with other types of ADCs.

[0086] Meanwhile, the digital signal output from the converter circuit 521 may be input to a digital block 522. The digital block 522 may include, for example, a gray encoder, a gray to binary converter, and / or a deskew latch to generate a binary code that minimizes glitches.

[0087] The digital block 522 may be configured to process the digital signal output from the converter circuit 521, for example, to minimize defects in the digital noise data S2.

[0088] The signal output from the digital block 522 may be output as digital noise data S2 in a binary code format indicating noise via an output buffer 523. The noise data S2 may be a 5-bit signal, but is not limited to this. Depending on the embodiment, an 8-bit to 10-bit signal may be output, and other types of signals are also possible.

[0089] The noise data S2 may be output to the outside of the active compensation device 100 via a second output terminal VOUT2. The second output terminal VOUT2 may be connected to an external device, such as a data storage or waveform display device. The noise data S2 output to the outside of the active compensation device 100 may be monitored to monitor state changes or emergency situations. The noise data S2 may also be used in big data processing or artificial intelligence technology.

[0090] Meanwhile, in one embodiment, the target input voltage level of the analog-to-digital converter 520 may be designed to correspond to 0.3V to 1.3V, and the switching frequency may be designed to correspond to approximately 800 MHz. However, the present invention is not limited thereto. When the target input voltage level is designed to correspond to 0.3V to 1.3V, V in FIG. REFN corresponds to 0.3V, and V REFP may correspond to 1.3V. In one embodiment, VDDA may be designed to correspond to about 1.8V, but is not limited to this.

[0091] The IC unit 500 may further include a voltage controlled oscillator (VCO) 560. The voltage controlled oscillator 560 can generate a clock signal whose frequency changes depending on an input voltage. Such a voltage controlled oscillator 560 may be built into the IC unit 500 so that the active compensation apparatus 100 can generate a clock signal independently without using an external clock generator.

[0092] In one example, the voltage controlled oscillator 560 is connected to the terminal V ctrl The input voltage can be received from the outside (e.g., third device 400) via the voltage controlled oscillator 560. The clock signal generated by the voltage controlled oscillator 560 is transmitted to the ADC 520 and can be used to control the internal circuitry.

[0093] The linear regulator 550 can generate a low DC voltage for driving the internal circuits of the IC unit 500, such as the ADC 520 and the VCO 560. In one example, the linear regulator 550 can receive an input voltage of approximately 12 V from an external source (e.g., the third device 400) via the terminals VSS and VDD of the IC unit 500, and output a low DC voltage of approximately 1.8 V. However, this is not limiting. The low DC voltage can be used to drive the internal circuits of the IC unit 500, such as the ADC 520 and the VCO 560.

[0094] According to one embodiment of the present invention, the noise data generated by the digital circuit unit 501 can be used to control the operation of the amplifier unit 130 so that the amplifier unit 130 operates optimally. For example, the operation of the amplifier unit 130 can be controlled based on the digital signal that is the output signal of the converter circuit 521, or the operation of the amplifier unit 130 can be controlled based on the output signal (e.g., noise data S2) of the digital block 522 or the output buffer 523. In this case, the amplifier unit 130 can perform different operations depending on the digital signal or the noise data S2.

[0095] For example, the IC unit 500 may further include a control circuit for controlling the amplifier unit 130 based on the digital signal or noise data S2. The control circuit may be connected to the amplifier unit 130 from the output end of the converter circuit 521, the digital block 522, or the output buffer 523, for example.

[0096] Fig. 7 is a diagram illustrating a more specific example of the embodiment shown in Fig. 2, and is a diagram illustrating an active compensation device 100A-1 according to one embodiment of the present invention. For convenience, the third device 400 and the reference potential 602 of the IC unit 500 are omitted in Fig. 7.

[0097] 7, the active compensation device 100A-1 may include a sensing unit 120A-1, an IC unit 500, and a compensation transformer 140A-1. The sensing unit 120A-1, the IC unit 500, and the compensation transformer 140A-1 are examples of the sensing units 120, 120A, the IC unit 500, and the compensation units 140, 140A, respectively.

[0098] The active compensation device 100A-1 detects a noise current I input in common mode to each of the two large current paths 111 and 112 connected to the first device 300. n is sensed and converted into a compensation voltage V inj1 can be actively compensated for.

[0099] The sensing unit 120A-1 may be, for example, a sensing transformer in which a secondary wire is wound around a CM choke around which a power line corresponding to the large current paths 111 and 112 is wound. The secondary wire may be connected to the input terminal VIN of the IC unit 500.

[0100] In this way, when the sensing unit 120A-1 is formed using a CM choke, the sensing unit 120A-1 not only performs the functions of sensing and transforming, but also serves as a passive filter as a CM choke. That is, a sensing transformer formed by winding a secondary wire around a CM choke can filter the noise current I n Along with sensing and transforming the noise current I n It can simultaneously serve as a suppression or prevention of

[0101] On the other hand, the output signal V of the sensing unit 120A-1 sen may be input to the IC unit 500. As described above, the IC unit 500 receives the output signal V sen is converted into a digital signal to generate and output noise data S2, and the output signal V sen According to an embodiment, the IC unit 500 can control the operation of the amplifier unit 130 based on the digital signal or noise data S2.

[0102] The noise data S2 may be stored in a data storage external to the active compensation device 100A-1 and used.

[0103] The compensation signal S1 may correspond to an input voltage of the compensation transformer 140A-1. The compensation transformer 140A-1 outputs a compensation voltage V in series on the large current paths 111 and 112 on the secondary side based on the input voltage applied to the primary side. inj1 A compensation voltage V is generated in series on the large current paths 111 and 112. inj1 is the noise current I flowing through the large current paths 111 and 112. nThis can have the effect of suppressing the above.

[0104] Such an active compensation device 100A-1 reduces the noise current I n is sensed and the compensation voltage V inj1 This is an example of a CSVC (current sensing voltage compensating) type that compensates with

[0105] Fig. 8 is a diagram illustrating a more specific example of the embodiment shown in Fig. 1, and is a diagram illustrating an active compensation device 100B according to one embodiment of the present invention. For convenience, the third device 400 and the reference potential 602 of the IC unit 500 are omitted in Fig. 8.

[0106] 8, the active compensation device 100B may include a sensing transformer 120B, an IC unit 500, and a compensation unit 140B. The sensing transformer 120B, the IC unit 500, and the compensation unit 140B are examples of the sensing units 120, 120A, the IC unit 500, and the compensation unit 140, respectively.

[0107] The active compensation device 100B reduces the noise current I input in common mode to each of the two large current paths connected to the first device 300. n is sensed and converted into a compensation current I inj can be actively compensated for.

[0108] The sensing transformer 120B may have a structure in which, for example, a primary wire and a secondary wire pass through or are wound at least once around a single core. The primary wire of the sensing transformer 120B may correspond to a power line, which is a large current path, and the secondary wire of the sensing transformer 120B may be connected to the input terminal of the IC unit 500. In one embodiment, by passing the primary wire and the secondary wire through or winding at least once around a core, rather than using a CM choke, the volume of the sensing transformer 120B can be minimized.

[0109] The output signal of the sensing unit 120B is the noise current I n can be proportional to the magnitude of

[0110] The output signal of the sensing unit 120B may be input to the IC unit 500. As described above, the IC unit 500 may include a digital circuit unit 501 that converts the output signal into a digital signal to generate and output noise data S2, and an amplifier unit 130 that outputs a compensation signal (or an amplified signal) S1 based on the output signal. According to an embodiment, the IC unit 500 may further include a circuit that controls the operation of the amplifier unit 130 based on the digital signal or the noise data S2.

[0111] The noise data S2 may be stored in a data storage external to the active compensation device 100B and used.

[0112] The compensation signal S1 may be input to the compensation unit 140B. In this embodiment, the compensation unit 140B may include a compensation transformer and a compensation capacitor unit.

[0113] The primary side of the compensation transformer may be connected to the first output terminal VOUT of the IC unit 500, and the secondary side of the compensation transformer may be connected to the large current path. The compensation transformer insulates the IC unit 500 from the large current path, and generates a compensation current I to be injected into the large current path based on the amplified current (i.e., the compensation signal S1) flowing through the primary side. inj can be generated on the secondary side.

[0114] The secondary side of the compensation transformer may be disposed on a path connecting the compensation capacitor unit and the reference potential, i.e., one end of the secondary side may be connected to the large current path via the compensation capacitor unit, and the other end of the secondary side may be connected to the reference potential of the active compensation device 100B.

[0115] The current transformed by the compensating transformer (i.e., the secondary current) I inj is the compensation current I injThe compensation capacitor section may be configured to inject or extract the large current into or from the large current path as a compensation transformer. In this way, the compensation capacitor section can form a path through which the current generated on the secondary side of the compensation transformer flows to each large current. Therefore, the active compensation device 100B can reduce EMI noise.

[0116] The compensation capacitor section may include two Y-capacitors (Y-caps) each having one end connected to the secondary side of the compensation transformer and the other end connected to the large current path.

[0117] Such an active compensation device 100B reduces the noise current I n is sensed and a compensation current I inj This is an example of a feedforward CSCC (current sensing current compensating) type that compensates with

[0118] 9 is a diagram schematically illustrating an active compensation device 100C according to another embodiment of the present invention, in which the third device 400 and the reference potential 602 of the IC unit 500 are omitted for convenience.

[0119] The active compensation device 100C reduces the noise current I input in common mode to each of the two large current paths connected to the first device 300. n is sensed and converted into a compensation current I inj2 can be actively compensated for.

[0120] 9, an active compensation device 100C may include a sensing unit 120C, an IC unit 500, and a compensation unit 140C. The compensation unit 140C may include a compensation transformer and a compensation capacitor unit.

[0121] The sensing unit 120C corresponds to the sensing unit 120A-1 described in FIG. 7, the IC unit 500 corresponds to the IC unit 500 described in various embodiments, and the compensation unit 140C corresponds to the compensation unit 140B described in FIG. 8, so detailed descriptions thereof will be omitted.

[0122] Such an active compensation device 100C is configured to detect the sensed noise current I n returns to the subsequent stage and generates the compensation current I inj2 This is an example of a feedback CSCC (current sensing current compensating) type that compensates with

[0123] 10 is a schematic diagram of an active compensation device 100D according to yet another embodiment of the present invention, in which the third device 400 and the reference potential 602 of the IC unit 500 are omitted for convenience.

[0124] The active compensation device 100D reduces the noise current I input in common mode to each of the two large current paths connected to the first device 300. n is sensed and converted into a compensation voltage V inj1 and compensation current I inj2 Compensation can be made jointly.

[0125] 10, the active compensation device 100D may include a sensing unit 120D, an IC unit 500′, a first compensation unit 140D-1, and a second compensation unit 140D-2. The second compensation unit 140D-2 may include a compensation transformer and a compensation capacitor unit.

[0126] The sensing unit 120D corresponds to the sensing unit 120A-1 described in FIG. 7, the first compensation unit 140D-1 corresponds to the compensation transformer 140A-1 described in FIG. 7, and the second compensation unit 140D-2 corresponds to the compensation unit 140B described in FIG. 8, so detailed explanations thereof will be omitted.

[0127] The output signal of the sensing unit 120D (e.g., V sen ) may be input to the IC unit 500'. As described above, the IC unit 500' may receive the output signal (e.g., V sen ) is converted into a digital signal and processed to generate noise data S2, and the output signal (e.g., V sen), the first compensation signal S1-1 and the second compensation signal S1-2 can be output.

[0128] As an example, the IC unit 500' receives an input signal (e.g., V sen ) and outputs a first compensation signal S1-1; sen ) and outputting a second compensation signal S1-2.

[0129] According to an embodiment, the IC unit 500' can control the operation of the first amplifying unit 130-1 and / or the second amplifying unit 130-2 based on the digital signal or noise data S2.

[0130] The IC unit 500' including the first amplifier unit 130-1, the second amplifier unit 130-2, and the digital circuit unit 301 may be physically a single IC chip. For example, the IC unit 500' may include a 1-1 output terminal that outputs the first compensation signal S1-1 to the first compensation unit 140D-1 side and a 1-2 output terminal that outputs the second compensation signal S1-2 to the second compensation unit 140D-2 side. However, the present invention is not limited to this.

[0131] The first compensation signal S1-1 output from the IC unit 500' may correspond to the input voltage of the first compensation unit 140D-1. The first compensation unit 140D-1 generates a compensation voltage V in series on the large current path on the secondary side based on the input voltage applied to the primary side. inj1 A compensating transformer may be used to induce a compensating voltage V. inj1 is the noise current I that flows through the large current path. n This can have the effect of suppressing the above.

[0132] Meanwhile, the compensation transformer included in the second compensation unit 140D-2 generates a compensation current I to be injected into the large current path based on the second compensation signal S1-2 output from the IC unit 500'. inj2 The current transformed by the compensation transformer (i.e., the secondary current) I inj2may be injected or drawn into the large current path as a compensation current via a compensation capacitor section.

[0133] In one embodiment, the first compensator 140D-1 may be disposed in front of the sensing unit 120D, and the second compensator 140D-2 may be disposed behind the sensing unit 120D. For example, the first compensator 140D-1 may perform voltage compensation, and the second compensator 140D-2 may perform current compensation. This embodiment can simultaneously compensate for common-mode voltage and current, thereby effectively reducing noise.

[0134] FIG. 11 shows a more specific example of the embodiment shown in FIG. 1, and is a diagram schematically showing an active compensation device 100E according to one embodiment of the present invention.

[0135] The active compensation device 100E differs from the active compensation device 100A-1 shown in FIG. 8 only in the IC section 500'', and other configurations correspond to those of the active compensation device 100A-1, so a description thereof will be omitted.

[0136] In the active compensation device 100E according to an embodiment, the IC unit 500'' may include the amplifier unit 130, a first digital circuit unit 501-1, and a second digital circuit unit 501-2.

[0137] Similar to the digital circuit unit 501 described above, the first digital circuit unit 501-1 can output first digital noise data S2-1 based on the same input signal as the input signal of the amplifier unit 130 (i.e., the input signal of the IC unit 500''). The second digital circuit unit 501-2 can output second digital noise data S2-2 based on the output signal of the amplifier unit 130.

[0138] According to this embodiment, the output terminal of the amplifier unit 130 in the IC unit 500'' may be connected to the input terminal of the second digital circuit unit 501-2.

[0139] According to this embodiment, the first digital circuit unit 501-1 and the second digital circuit unit 501-2 can convert analog signals at the input / output terminals of the amplifier unit 130 into digital data, respectively. That is, the IC unit 500'' can detect all analog signals before and after amplification and output them as corresponding digital data S2-1 and S2-2. According to this embodiment, not only the output noise data (e.g., first noise data S2-1) of the sensing unit 120 but also the output noise data (e.g., second noise data S2-2) of the amplifier unit 130 can be monitored. For example, the first noise data S2-1 and the second noise data S2-2 can be used to determine whether the analog amplifier unit 130 is operating normally.

[0140] According to various embodiments of the present invention configured as described above, active compensation devices 100, 100A, 100A-1, 100B, 100C, 100D, and 100E can be used to compensate for noise signals and collect noise data.

[0141] According to various embodiments of the present invention, noise data can be extracted and collected from an active compensation device and utilized for various applications. For example, noise data output from an active compensation device according to embodiments of the present invention can be monitored to monitor for status changes or emergency situations. The noise data can also be utilized for big data processing.

[0142] Although the present invention has been described with reference to one embodiment shown in the drawings, it is understood that the present invention is merely illustrative and that various modifications and variations of the embodiment are possible therefrom. Therefore, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. [Industrial Applicability]

[0143] An embodiment of the present invention can be used in electronic devices such as home appliances, industrial electrical appliances, electric vehicles, aviation, energy storage systems, etc. However, the industrial applicability of an embodiment of the present invention is not limited to the above.

Claims

1. An active compensation device that actively compensates for noise generated in a common mode in each of at least two or more large current paths, a sensing unit that generates an output signal corresponding to a common mode noise signal on the large current path; an IC unit including an amplifier unit that outputs an amplified signal obtained by amplifying the output signal, and a digital circuit unit that outputs noise data obtained by digital conversion of the output signal; a compensation section that draws a compensation current from the large current path or generates a compensation voltage on the large current path based on the amplified signal.

2. the IC unit is made up of one IC chip, The one IC chip is 2. The active compensation device according to claim 1, comprising: an input terminal for receiving an input of the output signal of the sensing unit; a first output terminal for outputting the amplified signal; and a second output terminal for outputting the noise data.

3. The digital circuit unit an analog-to-digital conversion unit; 2. The active compensation device according to claim 1, further comprising: an input buffer that receives the output signal and attenuates it to a low-voltage analog signal that can be used by the analog-to-digital converter.

4. The IC unit includes:

4. The active compensation device according to claim 3, further comprising a voltage controlled oscillator for independently generating a clock signal for controlling an internal circuit of said analog-to-digital converter.

5. The IC unit includes:

2. The active compensation device according to claim 1, wherein the operation of the amplifier section is controlled based on the digital signal generated by the digital circuit section or the noise data.

6. The IC unit includes:

2. The active compensation device according to claim 1, further comprising: a first digital circuit unit that digitally converts an input signal of the amplifier unit to generate first noise data; and a second digital circuit unit that digitally converts an output signal of the amplifier unit to generate second noise data.

7. 4. The active compensation device according to claim 3, wherein the input buffer is composed of a multi-stage amplifier or a single-stage inverting amplifier.

8. The analog-to-digital conversion unit a converter circuit that outputs an input analog signal as a digital signal; a digital block that processes the digital signal output from the converter circuit to minimize imperfections; 4. The active compensation device according to claim 3, further comprising an output buffer that outputs the signal output from said digital block as digital noise data in a binary code format indicating noise.

9. The active compensation device of claim 1 , wherein the noise data is digitally converted into a binary code format indicative of the noise.

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