Active compensation device that provides electromagnetic noise data

Abstract

The present invention provides an active compensation device that actively compensates for noise occurring in a common mode in at least two or more large current paths. The active compensation device includes a sensing unit that generates an output signal corresponding to a common mode noise signal on the large current paths, an IC unit that receives the output signal, converts it into a digital signal, generates noise data and an amplified signal based on at least the digital signal, and outputs the noise data and the amplified signal, and a compensation unit that draws a compensation current from the large current paths or generates a compensation voltage on the large current paths based on the amplified signal. The noise data is provided to an external device.

Description

Technical Field

[0001] Embodiments of the present invention relate to an active compensation device, and more particularly to an active compensation device that compensates for noise current and / or noise voltage generated in common mode on two or more high-current paths connecting two devices.

Background Art

[0002] Generally, electrical devices such as home appliances, industrial electrical products, and electric vehicles emit noise during operation. For example, due to the switching operation of a power conversion device in an electronic device, noise may be emitted via a power line. If such noise is left unaddressed, it is not only harmful to the human body but also causes malfunction or failure in peripheral components and other electronic devices. Thus, the electronic interference caused by an electronic device to other devices is called EMI (Electromagnetic Interference). Among them, the noise transmitted via wires and board wirings is called conducted emission (CE) noise.

[0003] In order for electronic devices to operate without causing failure in peripheral components and other devices, the amount of EMI noise emission in all electronic products is strictly regulated. Therefore, most electronic products necessarily include a noise reduction device (e.g., an EMI filter) to reduce EMI noise current in order to meet the regulations on noise emission. For example, EMI filters are necessarily included in white goods such as air conditioners, electric vehicles, aviation, and energy storage systems (ESS). Conventional EMI filters use a common mode choke (CM choke) to reduce common mode (CM) noise among conducted emission (CE) noises. The common mode (CM) choke is a passive filter and plays a role in suppressing common mode noise current.

[0004] On one hand, in a high-power / high-current system, in order to prevent magnetic saturation of the common-mode choke and maintain noise reduction performance, the size or the number of the common-mode chokes has to be increased. As a result, there arises a problem that the size and price of the EMI filter for high-power products increase significantly. Summary of the Invention Problems to be Solved by the Invention

[0005] In recent years, in order to overcome the drawbacks of the above-mentioned passive EMI filters, there has been an increasing interest in the development of active EMI filters including amplifiers.

[0006] However, in the case of an active EMI filter including an amplifier composed of an analog circuit, it is fundamentally difficult to collect information regarding the noise after canceling the EMI noise.

[0007] The present invention has been devised to improve the above problems, and an object thereof is to provide an active compensation device capable of providing EMI noise as digital data. However, such problems are exemplary and do not limit the scope of the present invention. Means for Solving the Problems

[0008] An active compensation device for actively compensating noise generated in common mode in each of at least two or more high-current paths according to an embodiment of the present invention includes a sensing unit that generates an output signal corresponding to a common-mode noise signal on the high-current path, an IC unit that receives the output signal, converts it into a digital signal, generates noise data and an amplification signal respectively based on at least the digital signal, and outputs the noise data and the amplification signal, and a compensation unit that draws a compensation current from the high-current path or generates a compensation voltage on the high-current path based on the amplification signal, and the noise data can be provided to an external device.

[0009] According to one embodiment, the IC unit can recover the digital signal into an analog signal, amplify the analog signal to generate the amplified signal, and output the amplified signal via the first output terminal.

[0010] According to one embodiment, the IC unit may include an analog-to-digital conversion unit and an input buffer that receives the output signal and attenuates it to a low-voltage analog signal usable by the analog-to-digital conversion unit.

[0011] According to one embodiment, the analog-to-digital conversion unit may include a converter circuit that generates the digital signal from the low-voltage analog signal, and a configuration that processes and outputs the digital signal in order to reduce defects in the noise data.

[0012] According to one embodiment, the IC unit may further include a digital-to-analog conversion unit that receives the digital signal and converts it back into an analog signal, and a voltage-controlled oscillator that generates a clock signal for controlling the internal circuitry of the analog-to-digital conversion unit.

[0013] According to one embodiment, the IC unit consists of one IC chip, and the one IC chip may include an input terminal for receiving 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.

[0014] Other aspects, features, and advantages not mentioned above will become clear from the following drawings, claims, and detailed description of the invention. [Effects of the Invention]

[0015] According to various embodiments of the present invention configured as described above, it is possible to cancel EMI noise using an active EMI filter and collect EMI noise data.

[0016] According to various embodiments of the present invention, noise data can be extracted and collected from an active EMI filter and used for various purposes. For example, noise data output from an active EMI filter according to an embodiment of the present invention can be monitored for monitoring changes in state or emergency situations. Furthermore, the noise data can be used for big data processing.

[0017] Of course, the scope of the present invention is not limited by such effects. [Brief explanation of the drawing]

[0018] [Figure 1] A schematic diagram of the system configuration including the active compensation device 100 according to one embodiment of the present invention is shown. [Figure 2] Figure 1 shows a more specific example of the embodiment, and schematically illustrates an active compensation device 100A according to one embodiment of the present invention. [Figure 3-4] This shows a specific example of an IC section 500 according to various embodiments of the present invention. [Figure 5] An example of an input buffer 510 in one embodiment, specifically input buffer 510-1, is shown. [Figure 6] An input buffer 510-2 is shown as another example of the input buffer 510 in one embodiment. [Figure 7] An example of an analog-to-digital conversion unit 520 in one embodiment is shown. [Figure 8] Figure 2 shows a more specific example of the embodiment, and schematically illustrates an active compensation device 100A-1 according to one embodiment of the present invention. [Figure 9] Figure 1 shows a more specific example of the embodiment, and schematically illustrates an active compensation device 100B according to one embodiment of the present invention. [Figure 10] An active compensation device 100C according to another embodiment of the present invention is schematically shown. [Figure 11]An active compensation device 100D according to another embodiment of the present invention is schematically shown. [Figure 12] This shows a specific example of an IC section 500 according to another embodiment of the present invention. [Figure 13] This document presents an algorithm for detecting an emergency situation according to one embodiment. [Modes for carrying out the invention]

[0019] An active compensation device according to one embodiment of the present invention, which actively compensates for common-mode noise occurring in each of at least two or more high-current paths, includes: a sensing unit that generates an output signal corresponding to a common-mode noise signal on the high-current path; an IC unit that receives the output signal as input, converts it into a digital signal, generates noise data and an amplified signal based at least on the digital signal, and outputs the noise data and the amplified signal; and a compensation unit that draws a compensation current from the high-current path or generates a compensation voltage on the high-current path based on the amplified signal, wherein the noise data can be provided to an external device.

[0020] The present invention can be modified in various ways and has various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. The effects and features of the present invention, as well as methods for achieving them, will become clear by referring in detail to the embodiments described below together with the drawings. However, the present invention is not limited to the embodiments disclosed below and can be embodied in various forms.

[0021] Embodiments of the present invention will be described in detail below with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components will be given the same reference numerals, and redundant descriptions thereof will be omitted.

[0022] In the following embodiments, terms such as "first," "second," etc., are not limited in meaning but are used to distinguish one component from another.

[0023] In the following embodiments, a singular expression includes plural expressions unless the context clearly indicates otherwise.

[0024] In the following embodiments, terms such as "includes" or "has" 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.

[0025] In the drawings, the size of the components may be exaggerated or reduced for illustrative purposes. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for illustrative purposes and the present invention is not necessarily limited to those shown.

[0026] In the following embodiments, when components, parts, blocks, modules, etc. are connected, this includes not only cases where the components, parts, blocks, modules are directly connected, but also cases where other components, parts, blocks, modules are interposed between them and they are indirectly connected.

[0027] Figure 1 schematically shows the configuration of a system including an active compensation device 100 according to one embodiment of the present invention. The active compensation device 100 compensates for common-mode (CM) noise currents I generated from two or more high-current paths 111, 112 from the first device 300. n (For example, EMI noise current) and / or noise voltage (for example, EMI noise voltage) can be actively compensated.

[0028] Referring to Figure 1, the active compensation device 100 may include a sensing unit 120, an IC unit 500, and a compensation unit 140.

[0029] In this specification, the first device 300 can be various types of devices that use a power supply provided by the second device 200. For example, the first device 300 can be a load driven using a power supply provided by the second device 200. Alternatively, the first device 300 can be a load (e.g., an electric vehicle) that stores energy using a power supply provided by the second device 200 and is driven using the stored energy. However, it is not limited to these.

[0030] In this specification, the second device 200 can be various types of devices for supplying power to the first device 300 in the form of current and / or voltage. For example, the second device 200 can be a device that produces and supplies power, or a device that supplies power produced by another device (e.g., an electric vehicle charging device). Of course, the second device 200 can also be a device that supplies stored energy, but is not limited thereto. A power converter may be located on the first device 300 side. For example, the switching operation of the power converter may cause a common-mode noise current I n This can be generated on the high-current paths 111 and 112. Alternatively, for example, noise current leaking from the first device 300 can flow into the high-current paths 111 and 112 via the second device 200 through ground (e.g., reference potential 1), thereby generating noise current I n This can occur.

[0031] Noise current I generated in the same direction on high-current paths 111 and 112 n This can be called the common-mode noise current. Also, the common-mode noise voltage V n This voltage may be the voltage generated between ground (e.g., reference potential 1) and the high-current paths 111 and 112, rather than the voltage generated between the high-current paths 111 and 112.

[0032] For example, the first device 300 can handle a noise source, and the second device 200 can handle a noise receiver.

[0033] The two or more large current paths 111, 112 can be paths for transmitting the power supplied by the second device 200, that is, the large currents I21, I22 to the first device 300, and can be, for example, power lines. For example, each of the two or more large current paths 111, 112 can be a live line and a neutral line. At least a part of the large current paths 111, 112 can pass through the compensation device 100. The large currents I21, I22 can be alternating currents having frequencies in the second frequency band. The second frequency band can be, for example, a 50 Hz - 60 Hz band.

[0034] Also, the two or more large current paths 111, 112 can be paths for transmitting the noise current I n from the first device 300 side to the second device 200. Or, it can also be a path for generating a noise voltage V n with respect to the ground (for example, the reference potential 1).

[0035] The noise current I n or the noise voltage V n can be input in common mode with respect to each of the two or more large current paths 111, 112. The noise current I n can be a current that is unintentionally generated in the first device 300 due to various causes. For example, the noise current I n can be a noise current due to the parasitic capacitance between the first device 300 and the surrounding environment. Or, the noise current I n can be a noise current generated by the switching operation of the power conversion device of the first device 300. The noise current I n and the noise voltage V [[ID=****]] n can have frequencies in the first frequency band. The first frequency band can be a frequency band higher than the aforementioned second frequency band. The first frequency band can be, for example, a 150 KHz - 30 MHz band.

[0036] In the figure, the noise current In and noise voltage V n Although shown at the node between the first device 300 and the sensing unit 120 on the high-current paths 111, 112, the terms “noise current” and “noise voltage” in this specification are not limited thereto and may refer to voltages and currents that can be generated in common mode with a first frequency throughout the entire high-current paths 111, 112.

[0037] On the other hand, 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), as shown in Figure 1. The number of high-current paths 111, 112 can vary depending on the type and / or form of power supply used by the first device 300 and / or the second device 200.

[0038] The sensing unit 120 detects noise current I on two or more high-current paths 111, 112. n Detects noise current I n The IC unit 500 can generate an output signal corresponding to this. That is, the sensing unit 120 can detect the noise current I on the high-current paths 111 and 112. n This can mean a means for detecting noise current I n At least a portion of the high-current paths 111 and 112 can pass through for sensing, but the portion of the sensing unit 120 that generates the output signal due to sensing can be isolated from the high-current paths 111 and 112. For example, the sensing unit 120 can be implemented as a sensing transformer. The sensing transformer is isolated from the high-current paths 111 and 112 and receives noise current I on the high-current paths 111 and 112. n It can detect this.

[0039] The IC unit 500 is electrically connected to the sensing unit 120 and can generate a compensation signal S1 corresponding to the amplified signal of the output signal output by the sensing unit 120, and can further generate noise data S2 corresponding to the digital signal of the output signal. In this invention, "amplification" can mean adjusting the magnitude and / or phase of the signal to be amplified. The IC unit 500 can be implemented by various means and may include active elements.

[0040] According to various embodiments of the present invention, the IC unit 500 can output a compensation signal S1 for canceling out noise to the compensation unit 140 and output digital data S2 indicating the noise to the outside.

[0041] In various embodiments of the present invention, the IC unit 500 may include a circuit that converts the output signal (i.e., the 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 generated based on the digital signal to the outside. The IC unit 500 may also convert the digital signal back into an analog signal, amplify it, and output it to the compensation unit 140 as a compensation signal S1. Detailed examples of the configuration of the IC unit 500 will be described later in Figures 3 to 7.

[0042] For example, the noise data S2 output from the active compensation device 100 can be transmitted to and stored in data storage, or transmitted to a waveform display device. For example, the noise data S2 can be monitored to monitor changes in state or emergency situations. The noise data S2 can also be used for big data processing or artificial intelligence technology.

[0043] On the other hand, the IC unit 500 is supplied with power from a third device 400, which is separated from the first device 300 and / or the second device 200, and can amplify the output signal output by the sensing unit 120 to generate an amplified current / voltage as a compensation signal S1, and generate noise data S2 based on the output signal. In this case, the third device 400 may be supplied with power from a power source unrelated to the first device 300 and the second device 200 and generate the input power supply for the IC unit 500. Selectively, the third device 400 may also be supplied with power from either the first device 300 or the second device 200 and generate the input power supply for the IC unit 500.

[0044] The IC unit 500 can output an 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 compensated voltage or a compensated current based on the input compensation signal (amplified voltage or amplified current).

[0045] According to one embodiment, the compensation unit 140 can generate a compensation voltage in series on the high-current paths 111 and 112 based on the amplified voltage output from the IC unit 500. The output side of the compensation unit 140 can generate a compensation voltage in series with the high-current paths 111 and 112, but can be isolated from the IC unit 500. For example, the compensation unit 140 can consist of a compensation transformer for the purpose of isolation. For example, the primary side of the compensation transformer is applied to the compensation signal output from the IC unit 500, and the secondary side of the compensation transformer can generate a compensation voltage based on the compensation signal. The compensation voltage is the noise current I flowing on the high-current paths 111 and 112. n This can provide an effect of suppressing [the problem]. In this case, the compensation unit 140 can be considered a voltage compensation unit. A detailed explanation of voltage compensation will be given later in Figures 2, 8, and 11.

[0046] In another embodiment, the compensation unit 140 can generate a compensation current based on the amplification current output from the IC unit 500. The compensation current is injected into or drawn out of the high-current paths 111 and 112, thereby reducing the noise current I on the high-current paths 111 and 112. n This can be offset or reduced. In this case, the compensation unit 140 can be current compensation. A detailed explanation of current compensation will be given later in Figures 9, 10, and 11. On the other hand, the output side of the compensation unit 140 can be connected to the high-current paths 111 and 112 in order to pass the compensation current through the high-current paths 111 and 112, but can be isolated from the IC unit 500. For example, the compensation unit 140 may include a compensating transformer for said isolation.

[0047] The compensation unit 140 can be a feedforward type that compensates for noise input from the first device 300 at the front end, which is the power supply side. However, the present invention is not limited thereto, and the active compensation device 100 can also include a feedback type compensation unit that compensates for noise by sending it back to the downstream stage (see Figure 10).

[0048] Figure 2 shows a more specific example of the embodiment shown in Figure 1, and schematically illustrates an active compensation device 100A according to one 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.

[0049] In Figure 2 and the following diagrams, the first device 300 and the second device 200 can be omitted. That is, the high-current paths 111 and 112 upstream of the active compensation device 100A (for example, on the compensation unit 140A side) can be connected to the power lines of the second device 200, and the high-current paths 111 and 112 downstream (for example, on the sensing unit 120A side) can be connected to the power lines of the first device 300.

[0050] According to one embodiment, the sensing unit 120 described above may include a sensing transformer 120A.

[0051] The sensing transformer 120A is isolated from the high-current paths 111 and 112, and the noise current I on the high-current paths 111 and 112 n or noise current I n The voltage induced across the sensing transformer 120A by this (for example, V choke This can be a means for detecting ).

[0052] The sensing transformer 120A may include a primary side 121 located on the high-current paths 111 and 112 and a secondary side 122 connected to the input terminal of the IC section 500. The sensing transformer 120A has a primary side 121 (e.g., primary winding) located on the high-current paths 111 and 112 that detects noise current I n Based on the magnetic flux density induced by the induced current or voltage V, an induced current or voltage V is induced in the secondary side 122 (e.g., the secondary winding). sen This can generate the following. The primary side 121 of the sensing transformer 120A can be, for example, a winding in which a first high-current path 111 and a second high-current path 112 are wound around a single core.

[0053] The sensing transformer 120A specifically detects noise current I on the first high-current path 111 (e.g., the live line). n The magnetic flux density induced by and the magnetic flux density induced by the noise current In on the second high-current path 112 (e.g., the neutral wire) can be configured to overlap (or reinforce) each other. In this case, high-currents I21 and I22 also flow on the high-current paths 111 and 112, but the magnetic flux density induced by the high-current I21 on the first high-current path 111 and the magnetic flux density induced by the high-current I22 on the second high-current path 112 can be configured to cancel each other out. As an example, the sensing transformer 120A can also be configured to handle the noise current I in the first frequency band (e.g., a band having a range of 150KHz to 30MHz). nThe system can be configured such that the magnitude of the magnetic flux density induced by is greater 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).

[0054] Thus, the sensing transformer 120A is configured to cancel out the magnetic flux densities induced by the large currents I21 and I22, and the noise current I n Only the voltage V induced on the secondary side 122 of the sensing transformer 120A can be detected. sen This is the noise current I n The induced voltage of the primary side 121 corresponding to (for example, V) choke ) can be a voltage converted at a constant ratio.

[0055] The IC section 500 receives the induced voltage V induced on the secondary side of the sensing transformer 120A. sen The induced voltage V can be amplified and output as a compensation signal S1. Furthermore, the IC section 500 controls the induced voltage V sen Based on this, noise data S2 can be output. A detailed example of the configuration of the IC section 500 will be described later in Figures 3 to 7.

[0056] According to one embodiment, the aforementioned compensation unit 140 may include a compensating transformer 140A.

[0057] The compensating transformer 140A can isolate the IC section 500, which includes the active elements, from the high-current paths 111 and 112. With the compensating transformer 140A isolated from the high-current paths 111 and 112, it applies a compensation voltage V to the high-current paths 111 and 112 based on the compensation signal S1 output from the IC section 500. inj1 This can induce a voltage compensation mechanism, which can be used as a means of voltage compensation.

[0058] The compensating transformer 140A can have a structure in which, for example, the primary side wire 141 and the secondary side wire 142 pass through a single core, or are wound at least once. The primary side wire 141 is the wire through which the compensation signal S1 output from the IC unit 500 flows, and the secondary side wire 142 can correspond to high-current paths 111 and 112.

[0059] The compensating transformer 140A generates a compensation voltage V on the high-current paths 111 and 112, which are the secondary sides 142, based on the amplified voltage generated on the primary side 141. inj1 It can induce this.

[0060] On the other hand, the active compensation device 100A according to one embodiment of the present invention may further include a decoupling capacitor section 170.

[0061] The decoupling capacitor section 170 can be positioned, for example, between the sensing section 120 and the first device 300, and can consist of two Y-capacitors, one end of which is connected to a reference potential 1601 and the other end of which is connected to high-current paths 111 and 112, respectively.

[0062] On the other hand, the reference potentials of the IC section 500 (reference potentials 2, 602) and the reference potentials of the compensation device 100A (reference potentials 1, 601) can be distinct from each other.

[0063] Figures 3 and 4 show a specific example of the IC section 500 according to various embodiments of the present invention. Referring to Figure 3, the IC section 500 according to an embodiment of the present invention may include an input buffer 510, an analog-to-digital converter 520, a digital-to-analog converter 530, an output amplifier 540, and a linear regulator 550.

[0064] Figure 4 shows the configuration of the IC section 500 according to one embodiment of the present invention in more detail.

[0065] Referring together to Figures 3 and 4, the IC section 500 can be physically a single IC chip. According to this embodiment, the digital noise data and compensation signal described above can be generated on a single IC chip. In other words, the configuration for generating noise data (e.g., a circuit) and the configuration for generating the compensation signal can be realized on a single IC chip. However, this is only one embodiment, and in other embodiments, the configuration for generating noise data and the configuration for generating the compensation signal can be realized on one or more different chips or packages.

[0066] The IC unit 500 may include an input terminal VIN that receives the output signal from the sensing unit 120, a first output terminal VOUT that outputs a compensation signal, and a second output terminal VOUT2 that outputs digital noise data.

[0067] As mentioned above, the sensing unit 120 detects the noise signal (I n or V n The sensing unit 120 can sense the noise signal and generate an output signal corresponding to it. The output signal output from the sensing unit 120 becomes the input signal for the IC unit 500.

[0068] The output signal from the sensing unit 120 can be input to the input buffer 510 via the input terminal VIN of the IC unit 500. The input signal to the input buffer 510 will correspond to a noise signal.

[0069] In one embodiment, the input noise signal to the input buffer 510 can have a high-voltage swing of 10V or more. Therefore, for example, the input buffer 510 can be a high-swing DMOS with sufficient voltage resistance and performance.

[0070] Figure 5 shows input buffer 510-1 as an example of input buffer 510 in one embodiment, and Figure 6 shows input buffer 510-2 as another example of input buffer 510 in one embodiment. The following description of input buffer 510 can include all descriptions of input buffers 510, 510-1, and 510-2.

[0071] Since the input noise signal can be a high-voltage signal of 10V or more, input buffers 510, 510-1, and 510-2 can be high-voltage (HV) input buffers. For example, the target voltage withstand voltage of input buffer 510 can be 12V, the input impedance can be 100kohm or more, and the bandwidth (BW) can correspond to approximately 30MHz. However, it is not limited to this.

[0072] The input buffer 510 can act as an attenuator, minimizing distortion of the input signal and reducing it to a low-voltage analog signal usable by the ADC520. In other words, the input buffer 510 can, for example, reduce the amplitude of the input noise signal before outputting it to the ADC520.

[0073] In one embodiment, as shown in Figure 5, the input buffer 510-1 may be composed of multiple stages of amplifiers, and in another embodiment, as shown in Figure 6, the input buffer 510-2 may be composed of a single-stage inverting amplifier.

[0074] For example, in the case of input buffer 510-2, if the input signal is V in At this time, the output signal V o This can be expressed by the following equation 1. <Formula 1> JPEG0007837592000001.jpg16170

[0075] On the other hand, the attenuated signal output from the input buffer 510 can be input to the analog-to-digital converter (ADC, 520). The attenuated signal input to the analog-to-digital converter 520 can correspond to an EMI noise signal. Here, "corresponding" means that the magnitude of the EMI noise signal has changed by a constant ratio, but is not limited to this.

[0076] The analog-to-digital conversion unit 520 can receive the attenuated signal and convert it into a digital signal, and can output digital noise data S2 based on the digital signal. The digital signal can also be transmitted to the digital-to-analog conversion unit 530 and used to generate a compensation signal S1.

[0077] Figure 7 shows an example of an analog-to-digital conversion unit 520 in one embodiment. According to one embodiment, the analog-to-digital conversion unit 520 may include a converter circuit 521, a digital block 522, and / or an output buffer 523.

[0078] The converter circuit 521 can be considered the data processing core of the analog-to-digital conversion unit 520. For example, the converter circuit 521 can be configured as a flash ADC, as shown in Figure 7. The flash ADC can output a digital signal in thermometer code format depending on the magnitude of the input analog signal. In one example, the digital signal in thermometer code format can be transmitted to the DAC 530 and serve as the basis for generating the compensation signal S1 (see Figure 4).

[0079] However, the converter circuit 521 is not limited to a flash ADC, and may include, for example, a SAR (successive approximation register) ADC or a sigma-delta ADC, and may be composed of other types of ADCs.

[0080] The converter circuit 521 can generate a digital signal from an input low-voltage analog signal. The digital signal generated by the converter circuit 521 is transmitted to the DAC 530 and can serve as the basis for generating the compensation signal S1 (see Figure 4).

[0081] On the other hand, the digital signal output from the converter circuit 521 can be input to the digital block 522. The digital block 522 can generate binary code with minimal glitches by including, for example, a gray encoder, a gray-to-binary converter, and / or a deskew latch.

[0082] The digital block 522 can be configured, for example, to process the digital signal output from the converter circuit 521 in order to minimize defects in the digital noise data S2.

[0083] The signal output from the digital block 522 can be output via the output buffer 523 as digital noise data S2 in binary code format, indicating noise. The noise data S2 can be output as a 5-bit signal, but is not limited to this. Depending on the embodiment, it can be output as an 8-bit to 10-bit signal, and other formats are also possible.

[0084] The noise data S2 can be output to the outside of the active compensation device 100 via the second output terminal VOUT2. The second output terminal VOUT2 can 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 can be monitored to check for changes in status or emergency situations. The noise data S2 may also be used for big data processing or artificial intelligence technology.

[0085] On the other hand, in one embodiment, the target input voltage level of the analog-to-digital conversion unit 520 can be designed to correspond to 0.3V to 1.3V, and the switching frequency can be designed to correspond to approximately 800MHz. However, the present invention is not limited thereto. When the target input voltage level is designed to be 0.3V to 1.3V, the V in Figure 7 REFNが 0.3V, V REFPが It can correspond to 1.3V. Furthermore, in one embodiment, VDDA can be designed to correspond to approximately 1.8V, but is not limited to these.

[0086] Referring again to Figure 4, the digital signal generated by the analog-to-digital conversion unit 520 can be transmitted to the digital-to-analog conversion unit 530 to generate the compensation signal S1. The digital signal can be, for example, in the form of a thermometer code. The digital-to-analog conversion unit 530 converts the digital signal into an analog signal and can output the converted analog signal to the output amplifier 540.

[0087] The output amplifier 540 can receive the analog signal and amplify it. The amplified signal can be output as a compensation signal S1 via the first output terminal VOUT. The compensation signal S1 output via the first output terminal VOUT can be input to the compensation unit 140 described above.

[0088] On the other hand, since the compensation signal S1 must be sufficiently large, the output amplifier 540 can be designed as a high-voltage (HV) DMOS. For example, the switching frequency of the DAC 530 can be designed to correspond to approximately 800 MHz, the output voltage of the output amplifier 540 can be designed to correspond to approximately 12 V, and the output current of the output amplifier 540 can be designed to correspond to approximately 1 A, but the present invention is not limited thereto.

[0089] The IC section 500 may further include a voltage-controlled oscillator (VOC, 560). The voltage-controlled oscillator 560 can generate a clock signal whose frequency changes according to the input voltage. This voltage-controlled oscillator 560 can be incorporated into the IC section 500 so that the active compensator 100 generates the clock signal itself without an external clock generator.

[0090] In one example, the voltage-controlled oscillator 560 is connected to terminal V of the IC section 500. ctrl The input voltage can be input from an external source (e.g., a third device 400) via this. The clock signal generated from the voltage-controlled oscillator 560 is transmitted to the ADC 520 and can be used to control the internal circuitry.

[0091] The linear regulator 550 can generate a DC low voltage to drive the internal circuits of the IC section 500, such as the ADC 520 and VCO 560. In one example, the linear regulator 550 can receive an input voltage of approximately 12V from an external source (e.g., a third device 400) via the terminals (VSS, VDD) of the IC section 500 and output a DC low voltage of approximately 1.8V. However, it is not limited to this. The DC low voltage can be used to drive the internal circuits of the IC section 500, such as the ADC 520 and VCO 560.

[0092] Figure 8 shows a more specific example of the embodiment shown in Figure 2, and schematically illustrates an active compensation device 100A-1 according to one embodiment of the present invention. For convenience, the third device 400 is omitted in Figure 8.

[0093] Referring to Figure 8, the active compensator 100A-1 may include a sensing unit 120A-1, an IC unit 500, and a compensating transformer 140A-1. The sensing unit 120A-1, IC unit 500, and compensating transformer 140A-1 are examples of the sensing units 120, 120A, IC unit 500, and compensating units 140, 140A described above, respectively.

[0094] The active compensation device 100A-1 receives noise current I in common mode from each of the two high-current paths 111 and 112 connected to the first device 300. n It senses this and compensates it with a voltage V inj1 It can be actively compensated.

[0095] The sensing unit 120A-1 can be, for example, a sensing transformer in which secondary wires are wound over a CM choke around which power lines corresponding to high-current paths 111 and 112 are wound. The secondary wires can be connected to the input terminal VIN of the IC unit 500.

[0096] When the sensing unit 120A-1 is formed using a CM choke in this way, the sensing unit 120A-1 can not only perform sensing and transforming functions, but also act as a passive filter as a CM choke. That is, a sensing transformer formed by winding the secondary wires in a CM choke can reduce noise current I n Along with sensing and transforming, noise current I n It can simultaneously play a role in suppressing or preventing it.

[0097] Meanwhile, the output signal V of the sensing unit 120A-1 sen This can be input to IC unit 500. As described above, IC unit 500 receives the output signal V sen The signal can be converted into a digital signal, noise data S2 can be generated and output based on the digital signal, and a compensation signal (or amplified signal) S1 can be output based on the digital signal.

[0098] The noise data S2 can be stored and used in data storage outside the active compensation device 100A-1.

[0099] The compensation signal S1 can correspond to the input voltage of the compensating transformer 140A-1. The compensating transformer 140A-1 applies a compensation voltage V in series with the secondary high-current paths 111 and 112 based on the input voltage applied to the primary side. inj1This can induce a compensation voltage V generated in series on the high-current paths 111 and 112. inj1 This is the noise current I flowing on the high-current paths 111 and 112. n It can provide an effect that suppresses [the phenomenon].

[0100] Such an active compensation device 100A-1 has noise current I n Senses and compensates voltage V inj1 This is an example of a CSVC (current sensing voltage compensating) type that compensates using [a specific method].

[0101] Figure 9 shows a more specific example of the embodiment shown in Figure 1, and schematically illustrates an active compensation device 100B according to one embodiment of the present invention. For convenience, the third device 400 is omitted in Figure 9.

[0102] Referring to Figure 9, the active compensation device 100B may include a sensing transformer 120B, an IC unit 500, and a compensation unit 140B. The sensing transformer 120B, IC unit 500, and compensation unit 140B are examples of the sensing units 120, 120A, IC unit 500, and compensation unit 140 described above, respectively.

[0103] The active compensation device 100B receives noise current I in common mode from each of the two high-current paths connected to the first device 300. n It senses this and compensates for it with current I inj It can be actively compensated.

[0104] The sensing transformer 120B can have a structure in which, for example, the primary and secondary wires pass through a single core or are wound at least once around it. The primary wire of the sensing transformer 120B can correspond to a power line which is a high-current path, and the secondary wire of the sensing transformer 120B can be connected to the input terminal of the IC section 500. In one embodiment, the volume of the sensing transformer 120B can be minimized by passing the primary and secondary wires through a core that is not a CM choke or winding them at least once around it.

[0105] The output signal of the sensing unit 120B is the noise current I n It can be proportional to the size of [something].

[0106] The output signal of the sensing unit 120B can be input to the IC unit 500. As described above, the IC unit 500 can convert the output signal into a digital signal, generate and output noise data S2 based on the digital signal, and output a compensation signal (or amplified signal) S1 based on the digital signal.

[0107] The noise data S2 can be stored and used in data storage outside the active compensation device 100B.

[0108] The compensation signal S1 can be input to the compensation unit 140B. In this embodiment, the compensation unit 140B may include a compensation transformer and a compensation capacitor unit.

[0109] The primary side of the compensating transformer can be connected to the output terminal of the IC section 500, and the secondary side of the compensating transformer can be connected to a high-current path. The compensating transformer injects a compensation current I into the high-current path based on the amplified current (i.e., compensation signal S1) flowing on the primary side, while isolating the IC section 500 from the high-current path. inj This can be generated on the secondary side.

[0110] The secondary side of the compensating transformer can be positioned on a path connecting the compensating capacitor section and the reference potential. That is, one end of the secondary side can be connected to the high-current path via the compensating capacitor section, and the other end of the secondary side can be connected to the reference potential of the active compensator 100B.

[0111] The current transformed via the compensating transformer (i.e., the secondary current) I inj This current can be injected into or drawn out as a compensating current into the high-current path via the compensating capacitor section. In this way, the compensating capacitor section can provide a path for the current generated on the secondary side of the compensating transformer to flow into each of the high-currents. As a result, the active compensator 100B can reduce EMI noise.

[0112] The compensating capacitor section may include two Y-capacitors (Y-capacitors, Y-caps), one end of which is connected to the secondary side of the compensating transformer and the other end of which is connected to the high-current path.

[0113] Such an active compensation device 100B has noise current I n It senses and provides a compensation current I from the power supply side of the preceding stage. injで This is an example of a compensating feedforward CCCC (current sensing current compensating) type.

[0114] Figure 10 schematically shows an active compensation device 100C according to another embodiment of the present invention. For convenience, the third device 400 is omitted.

[0115] The active compensation device 100C receives noise current I in common mode from each of the two high-current paths connected to the first device 300. n It senses this and compensates for it with current I inj2 It can be actively compensated.

[0116] Referring to Figure 10, the 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 compensating transformer and a compensating capacitor unit.

[0117] Since the sensing unit 120C corresponds to the sensing unit 120A-1 described in Figure 8, 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 Figure 9, a detailed explanation of these will be omitted.

[0118] Such an active compensation device 100C detects the sensed noise current I n Return to the next stage and compensate current I inj2 This is an example of a current sensing current compensating (CSCC) type feedback that compensates for this.

[0119] Figure 11 schematically shows an active compensation device 100D according to another embodiment of the present invention. For convenience, the third device 400 is omitted.

[0120] The active compensation device 100D receives noise current I in common mode from each of the two high-current paths connected to the first device 300. n It senses this and compensates it with a voltage V inj1 and compensation current I inj2 Compensation can be provided in a consolidated manner.

[0121] Referring to Figure 11, 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 compensating transformer and a compensating capacitor unit.

[0122] Since the sensing unit 120D corresponds to the sensing unit 120A-1 described in Figure 8, the first compensation unit 140D-1 corresponds to the compensating transformer 140A-1 described in Figure 8, and the second compensation unit 140D-2 corresponds to the compensation unit 140B described in Figure 9, a detailed explanation of these units will be omitted.

[0123] The output signal of the sensing unit 120D can be input to the IC unit 500'. As described above, the IC unit 500' can convert the output signal into a digital signal, generate and output noise data S2 based on the digital signal, and output a first compensation signal S1-1 and a second compensation signal S1-2 based on the digital signal.

[0124] For example, the IC section 500' may include a first amplifier that outputs a first compensation signal S1-1 from the output signal of the DAC 530, and a second amplifier that outputs a second compensation signal S1-2 from the output signal of the DAC 530. For instance, the IC section 500' may have a 1-1 output terminal that outputs the first compensation signal S1-1 to the first compensation unit 140D-1, and a 1-2 output terminal that outputs the second compensation signal S1-2 to the second compensation unit 140D-2. However, the present invention is not limited thereto.

[0125] The first compensation signal S1-1 output from IC section 500' can correspond to the input voltage of the first compensation unit 140D-1. The first compensation unit 140D-1 applies a compensation voltage V in series with the high-current path on the secondary side based on the input voltage applied to the primary side. inj1 It can be a compensating transformer that induces a compensating voltage V generated in series on a high-current path. inj1 This is the noise current I flowing on the high-current path. n It can provide an effect that suppresses [the phenomenon].

[0126] On the other hand, the compensating transformer included in the second compensation unit 140D-2 injects a compensating current I into the high-current path based on the second compensation signal S1-2 output from the IC unit 500'. inj2 This can be generated on the secondary side. The current converted via the compensating transformer (i.e., secondary side current) I injThis can be injected or drawn out as a compensating current into the high-current path via the compensating capacitor section.

[0127] In one embodiment, the first compensation unit 140D-1 can be positioned before the sensing unit 120D, and the second compensation unit 140D-2 can be positioned after the sensing unit 120D. For example, the first compensation unit 140D-1 can perform voltage compensation, and the second compensation unit 140D-2 can perform current compensation at the same time. According to this embodiment, common-mode voltage and current can be compensated simultaneously, and noise reduction can be effectively achieved.

[0128] Figure 12 shows a specific example of an IC section 500 according to another embodiment of the present invention.

[0129] Referring to Figure 12, the IC unit 500 according to an embodiment of the present invention may include an amplification unit 130 and a digital circuit unit 501. The digital circuit unit 501 can convert an analog signal, which is the input signal to the IC unit 500, into digital noise data S2, and may include an input buffer 510 and an analog-to-digital conversion unit 520.

[0130] The IC section 500 may further include a linear regulator 550 and a voltage-controlled oscillator (VOC, 560). The linear regulator 550 can generate a DC low voltage to drive the active elements inside the IC section 500. The voltage-controlled oscillator 560 can generate a clock signal to control the internal circuitry of the analog-to-digital conversion section 540.

[0131] The IC section 500 can be a single physical IC chip. According to this embodiment, the digital noise data S2 and compensation signal S1 described above can be generated from a single IC chip. In other words, the configuration for generating the noise data S2 (e.g., the digital circuit section 501) and the amplification section 130 for generating the compensation signal S1 can be realized on a single 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 can be realized on one or more different chips or packages.

[0132] The IC unit 500 may include an input terminal VIN that receives the output signal from the sensing unit 120, a first output terminal VOUT that outputs a compensation signal S1, and a second output terminal VOUT2 that outputs digital noise data S2.

[0133] As mentioned above, the sensing unit 120 detects the noise signal (I n or V n The sensing unit 120 can sense the noise signal and generate an output signal corresponding to it. The output signal output from the sensing unit 120 becomes the input signal for the IC unit 500.

[0134] The output signal from the sensing unit 120 is input to the IC unit 500 via the input terminal VIN, and then can be input to the amplification unit 130 and the input buffer 510 of the digital circuit unit 501 within the IC unit 500, respectively.

[0135] The amplification unit 130 can amplify the analog input signal. The amplified analog signal can be output as a compensation signal S1 via the first output terminal VOUT. The compensation signal S1 output via the first output terminal VOUT can be input to the compensation unit 140 described above. On the other hand, since the compensation signal S1 must be sufficiently large, the output voltage of the amplification unit 130 can be designed to correspond to approximately 12V, but the present invention is not limited thereto.

[0136] Meanwhile, the signal input via the input terminal VIN of the IC unit 500 is also input to the digital circuit unit 501, which includes the input buffer 510 and the analog-to-digital conversion unit 520.

[0137] According to one embodiment, the noise signal input to the input buffer 510 of the digital circuit unit 501 can have a high-voltage swing of 10V or more. Therefore, for example, the input buffer 510 can be a high-swing DMOS with sufficient voltage resistance and performance.

[0138] It goes without saying that all embodiments described herein can be applied in combination with one another.

[0139] According to the various embodiments of the present invention configured as described above, noise signals can be compensated and noise data can be collected simultaneously using active compensation devices 100, 100A, 100A-1, 100B, 100C, and 100D.

[0140] According to various embodiments of the present invention, noise data can be extracted and collected from an active compensation device and used for various purposes. For example, noise data output from an active compensation device according to an embodiment of the present invention can be monitored for monitoring state changes or emergency situations. Furthermore, the noise data can be used for big data processing.

[0141] In other words, according to one embodiment, by extracting and / or collecting noise data as described above, it is possible to detect an emergency situation, such as a failure of the inverter of a power-using device, and notify the administrator of this.

[0142] Figure 13 shows an algorithm for an emergency situation detection method according to one embodiment.

[0143] First, a first noise signal and / or a cluster of first noise signals can be detected via the sensing unit (810). Here, a cluster of first noise signals refers to a collection of first noise signals detected multiple times. For example, it can be a collection of first noise signals measured repeatedly under the same conditions.

[0144] Next, such first noise signal and / or first noise signal cluster are subjected to digital data processing (811). Such digital data processing can be performed via the analog-to-digital conversion unit 520 of the embodiment described above.

[0145] The first noise signal and / or first noise signal cluster, thus digitally converted, are determined by the reference (820).

[0146] A second noise signal and / or a second noise signal cluster can be detected via the sensing unit (830). Here, the second noise signal and / or second noise signal cluster refers to a noise signal measured at a different time, under different conditions and / or in a different environment than the first noise signal and / or first noise signal cluster. For example, if the first noise signal and / or first noise signal cluster is a noise signal when the inverter is operating normally, the second noise signal and / or second noise signal cluster can correspond to a noise signal when the inverter is not operating normally. A second noise signal cluster refers to a collection of second noise signals that have been detected multiple times. For example, it can be a collection of second noise signals that have been repeatedly measured multiple times under the same conditions.

[0147] Next, such a second noise signal and / or second noise signal cluster is subjected to digital data processing (831). Such digital data processing can be performed via the analog-to-digital conversion unit 520 of the embodiment described above.

[0148] Next, the second noise signal and / or second noise signal cluster is compared with the reference first noise signal and / or first noise signal cluster (840).

[0149] In this case, if the second noise signal and / or second noise signal cluster shows similarity to the first noise signal and / or first noise signal cluster within a certain range, the conditions under which the second noise signal and / or second noise signal cluster was measured can be considered unchanged from the conditions under which the first noise signal and / or first noise signal cluster was measured, and the second noise signal and / or second noise signal cluster can be measured again at other times, under other conditions, and / or environments. For example, the time, conditions, and / or environment under which the second noise signal and / or second noise signal cluster was measured can be considered normal.

[0150] In this context, similarity within a certain range can include agreement within a predetermined margin of error.

[0151] If the second noise signal and / or second noise signal cluster differs from the first noise signal and / or first noise signal cluster within a certain range, the measured state of the second noise signal and / or second noise signal cluster is considered to have changed from the measured state of the first noise signal and / or first noise signal cluster, and such a change in state can be displayed to the user (850).

[0152] The user can perform a diagnosis to determine if a malfunction has occurred or take other action in response to such a change in state. This subsequent process can be configured to run automatically in response to the change in state.

[0153] Thus, the present invention allows for monitoring of state changes or emergency situations using noise data output from an active compensation device, and enables subsequent actions to be taken.

[0154] Although the present invention has been described with reference to one embodiment shown in the figures, this is merely illustrative, and a person with ordinary skill in the art will understand that various modifications and changes to the embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical idea of ​​the appended claims. [Industrial applicability]

[0155] One embodiment of the present invention can be used in electronic devices such as home appliances, industrial electrical products, electric vehicles, aircraft, and energy storage systems. However, the industrial applications of one embodiment of the present invention are not limited to those described above.

Claims

1. In an active compensation device that actively compensates for common-mode noise occurring in each of at least two or more high-current paths, A sensing transformer that generates an output signal corresponding to a common-mode noise signal on the high-current path, and includes a primary side located on the high-current path and a secondary side that outputs the output signal to an IC unit, An IC unit that receives the output signal as input, converts it into a digital signal, generates noise data and an amplified signal based at least on the digital signal, and outputs the noise data and the amplified signal. A compensation unit that draws a compensation current from the high-current path or generates a compensation voltage in the high-current path based on the amplification signal, The aforementioned noise data is provided to an external device. The aforementioned IC section is Analog-to-digital conversion section, An input buffer that receives the output signal and attenuates it into a low-voltage analog signal usable by the analog-to-digital conversion unit, Includes, The aforementioned analog-to-digital conversion unit is A converter circuit that generates the digital signal from the low-voltage analog signal, A configuration for processing and outputting the digital signal in order to reduce defects in the aforementioned noise data, including, Active compensation device.

2. The aforementioned IC section is The digital signal is converted back to an analog signal, the analog signal is amplified to generate the amplified signal, and the amplified signal is output via the first output terminal. The active compensation device according to claim 1.

3. The aforementioned IC section is A voltage-controlled oscillator for generating a clock signal to control the internal circuitry of the analog-to-digital conversion unit, Further including, The active compensation device according to claim 1.

4. The aforementioned IC section consists of one IC chip. The aforementioned IC chip is The input terminal receives the output signal from the sensing transformer, A first output terminal that outputs the aforementioned amplified signal, A second output terminal that outputs the aforementioned noise data, including, The active compensation device according to claim 1.

5. The sensing transformer has a structure in which the primary and secondary wires pass through a single core, or are wound at least once around it. The active compensation device according to claim 1.

6. The aforementioned compensation unit is The primary side connected to the output terminal of the IC section, A secondary side connected to the aforementioned high-current path, which generates the compensation voltage on the high-current path based on the amplification signal, Compensating transformer including, The active compensation device according to claim 1.

7. A decoupling capacitor section is arranged between the sensing transformer and the first device that generates a noise signal, and includes two Y-capacitors, one end of which is connected to a reference voltage and the other end of which is connected to the high-current path. The active compensation device according to claim 6, further comprising:

8. The aforementioned compensation unit is The primary side connected to the output terminal of the IC section, A secondary side connected to the aforementioned high-current path, which generates the compensation current on the high-current path based on the amplification signal, Compensating transformer including, The active compensation device according to claim 1.

9. The aforementioned compensation unit is A compensating capacitor section including two Y-capacitors, one end of which is connected to the secondary side of the compensating transformer and the other end of which is connected to the high-current path, Further including, The active compensation device according to claim 8.

10. The compensating transformer has a structure in which the primary and secondary wires pass through a single core, or are wound at least once around it. The active compensation device according to claim 6 or claim 8.

11. The IC unit receives the output signal as input, converts it into a digital signal, generates noise data, a first amplified signal, and a second amplified signal based on the digital signal, and outputs the noise data, the first amplified signal, and the second amplified signal. The active compensation device according to claim 1.

12. The compensation unit includes a first compensation unit and a second compensation unit. The first compensation unit generates the compensation voltage based on the first amplified signal, The second compensation unit generates the compensation current based on the second amplification signal. The active compensation device according to claim 11.

13. The second compensation unit is located on the side of the first device that generates the noise signal, with reference to the sensing transformer. The first compensation unit is positioned on the side of the second device connected to the first device by the high-current path, with reference to the sensing transformer. The active compensation device according to claim 12.

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