KR102268163B1 - Active compensation device for compensating voltage and current - Google Patents

Abstract

In an active compensation device for actively compensating for noise generated in a common mode in each of at least two or more high current paths connected to a first device, the present invention provides an active compensation device comprising: at least two or more high current paths for transferring a high current supplied by a second device to the first device; a sensing unit for sensing a common mode noise current on the high current path to generate an output signal corresponding to the noise current; an amplification unit for amplifying the output signal of the sensing unit to generate a first amplified voltage and a second amplified voltage; a first compensation unit for generating a compensation voltage on the high current path based on the first amplified voltage; and a second compensation unit for branching and drawing a compensation current from the high current path based on the second amplified voltage. Accordingly, noise can be reduced more effectively.

Description

ACTIVE COMPENSATION DEVICE FOR COMPENSATING VOLTAGE AND CURRENT

Embodiments of the present invention relate to an active compensation device for compensating voltage and current, and to an active compensation device for simultaneously actively compensating noise voltage and current generated in a common mode on two or more large current paths connecting two devices. will be.

BACKGROUND ART In general, electrical devices such as household appliances, industrial electrical appliances and electric vehicles emit noise during operation. For example, noise may be emitted through a power line due to a switching operation of a power conversion device in an electronic device. If such noise is left unattended, it is not only harmful to the human body, but also causes malfunctions or malfunctions in surrounding parts and other electronic devices. As such, the electromagnetic interference that an electronic device exerts on other devices is called electromagnetic interference (EMI), and among them, noise transmitted through wires and substrate wiring is called Conducted Emission (CE) noise.

In order to ensure that electronic devices operate without causing malfunctions in peripheral components and other devices, the amount of EMI noise emission from all electronic products is strictly regulated. Therefore, most electronic products necessarily include a noise reduction device (eg, an EMI filter) for reducing EMI noise current in order to satisfy the regulation on the amount of noise emission. For example, in white home appliances such as air conditioners, electric vehicles, aviation, energy storage systems (ESSs), and the like, EMI filters are essentially included. A conventional EMI filter uses a common mode choke (CM choke) to reduce common mode (CM) noise among conducted emission (CE) noise. A common mode (CM) choke is a passive filter and serves to suppress common mode noise currents.

Meanwhile, with the development of technology, high-power products are increasingly being released. In a high-power/high-current system, the noise reduction performance of the common mode choke is rapidly deteriorated due to magnetic saturation. Therefore, in order to prevent magnetic saturation and maintain noise reduction performance in a high-power/high-current system, it is conventionally necessary to increase the size or number of common mode chokes. As a result, the size and price of EMI filters for high-power products are greatly increased.

The present invention has been devised to improve the above problems, and an object of the present invention is to provide an active compensation device capable of effectively compensating by simultaneously compensating for a common mode voltage and current. For example, it is possible to provide an active compensation device capable of satisfying noise emission regulations by actively compensating for common mode noise without increasing the size or size of a CM choke in a high-power product. However, these problems are exemplary, and the scope of the present invention is not limited thereto.

According to an embodiment of the present invention, an active compensation device for actively compensating for noise generated in a common mode in each of at least two large current paths connected to a first device, the high current supplied by the second device at least two or more high-current paths for delivering to the first device; a sensing unit sensing a common mode noise current on the high current path to generate an output signal corresponding to the noise current; an amplifying unit amplifying an output signal of the sensing unit to generate a first amplified voltage and a second amplified voltage; a first compensator for generating a compensation voltage on the large current path based on the first amplified voltage; and a second compensator for branching and drawing a compensation current from the large current path based on the second amplified voltage.

According to an embodiment, the first compensator is of a type that generates the compensation voltage on the large current path between the sensing unit and the second device, and the second compensator is configured between the sensing unit and the first device. It may be of a feedback type for branching the compensation current from the large current path of

According to an embodiment, the sensing unit may have a CM choke on which the two or more large current paths are wound, and a wire for generating the input voltage of the amplifying unit may be wound over the CM choke.

According to an embodiment, the first compensating unit may be formed such that a wire outputting the first amplified voltage of the amplifying unit passes through a core, and the large current path passes through the core or is wound one or more times.

According to an embodiment, the amplifying unit includes a first amplifying unit for outputting the first amplified voltage and a second amplifying unit for outputting the second amplified voltage, and the first compensating unit includes a first compensation transformer, The second compensator may include a second compensation transformer that generates an induced voltage in a path from which the compensation current is drawn based on the second amplified voltage.

According to an embodiment, the second compensating unit may further include a compensating capacitor composed of a Y-capacitor branched from the large current path and connected to the secondary side of the second compensating transformer.

Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to various embodiments of the present invention made as described above, it is possible to provide a compensation device that does not significantly increase in price, area, volume, and weight even in a high-power system. For example, in high-power products, the cost, area, volume, and weight can be reduced compared to passive filters that include only CM chokes by actively compensating for common-mode noise voltage and current without further increasing the size or size of the CM choke. .

According to various embodiments of the present invention, it is possible to compensate for the common mode voltage and the current at the same time, so that noise reduction can be more effective.

Through this, the present invention can provide an active compensation device capable of performing a current and voltage compensation function regardless of the load of the surrounding situation on the side from which the EMI noise is emitted.

Of course, the scope of the present invention is not limited by these effects.

1 schematically shows the configuration of a system including an active compensation device 100 according to an embodiment of the present invention.
FIG. 2 schematically shows an active compensation device 100A according to an embodiment of the present invention as a specific example of the active compensation device shown in FIG. 1 .
FIG. 3 schematically illustrates an active compensation device 100B according to an embodiment of the present invention as a specific example of the active compensation device shown in FIG. 2 .
4 to 6 schematically show active compensating devices 100C-1, 100C-2, and 100C-3 according to an embodiment of the present invention, as a specific example of the active compensation device shown in FIG. 3 . .
7 schematically shows the configuration of a system including an active compensation device 100D according to another embodiment of the present invention.
8 schematically shows the configuration of a system including an active compensation device 100E according to another embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following embodiments, terms such as first, second, etc. are used for the purpose of distinguishing one component from another, not in a limiting sense. In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility of adding one or more other features or components is not excluded in advance. In the drawings, the size of the components may be exaggerated or reduced for convenience of description. Where certain embodiments are otherwise feasible, a specific process sequence may be performed different from the described sequence. In the following embodiments, when a region, component, part, unit, module, etc. are connected, the region, component, part, unit, module, etc., as well as the case where the region, component, part, unit, and modules are directly connected It includes cases in which other regions, components, parts, units, and modules are interposed and indirectly connected between them.

1 schematically shows the configuration of a system including an active compensation device 100 according to an embodiment of the present invention. _{The active compensation device 100 includes a current I n} (eg, EMI noise current) and a voltage V generated in a common mode (CM) on two or more large current paths 111 and 112 from the first device 300 . _n (eg EMI noise voltage) can be actively compensated.

Referring to FIG. 1 , the active compensation apparatus 100 may include a sensing unit 120 , an amplifying unit 130 , a first compensating unit 140 , and a second compensating unit 160 .

In this specification, the first device 300 may be a device of various types using power supplied by the second device 200 . For example, the first device 300 may be a load driven using power supplied by the second device 200 . Also, the first device 300 may be a load (eg, an electric vehicle) that stores energy using power supplied by the second device 200 and is driven using the stored energy. However, the present invention is not limited thereto.

In the present specification, the second device 200 may 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 may be a device that generates and supplies power, or a device that supplies power produced by another device (eg, an electric vehicle charging device). Of course, the second device 200 may be a device for supplying 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 _n may be generated on the large current paths 111 and 112 by the switching operation of the power conversion device. _{Alternatively, for example, the noise current I n} may be generated as the noise current leaked from the first device 300 flows into the large current paths 111 and 112 through the second device 200 via the ground.

_{A noise current I n} generated in the same direction on the large current paths 111 and 112 may be referred to as a common mode noise current. In addition, the common mode noise voltage V _n may not be a voltage generated between the high current paths 111 and 112 , but may be a voltage generated between the ground (eg, reference potential 1 ) and the high current paths 111 and 112 .

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.

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

Also, the two or more high current paths 111 and 112 _{may be paths through which the noise current I n} from the first device 300 side is transmitted to the second device 200 . Alternatively, it may be a path _{in which the noise voltage V n} is generated with respect to the ground (eg, reference potential 1).

The noise current I _n or the noise voltage V _n may be input to each of the two or more large current paths 111 and 112 in a common mode. The noise current I _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. Alternatively, the noise current I _n may be a noise current generated by a switching operation of the power conversion device of the first device 300 . The noise current I _n and the noise voltage V _n may have a frequency of the first frequency band. The first frequency band may be a higher frequency band than the above-described second frequency band. The first frequency band may be, for example, a band of 150KHz to 30MHz.

In the drawing, the noise current I _n and the noise voltage V _n are shown between the node and the sensing unit 120 where the second compensator 160 and the large current paths 111 and 112 meet, but in this document, the 'noise current' and 'noise voltage' are not limited thereto, and may refer to voltages and currents that may be generated in a common mode with a first frequency across the large current paths 111 and 112 .

Meanwhile, the two or more high current paths 111 and 112 may include two paths as shown in FIG. 1 , three paths (eg, a three-phase three-wire power system) or four paths (eg, three-phase 4 line power system). The number of high current paths 111 and 112 may vary depending on the type and/or type of power used by the first device 300 and/or the second device 200 .

_{The sensing unit 120 may sense the noise current I n} on the two or more large current paths 111 and 112 , and may generate an output signal corresponding to the noise current I _{n toward the amplifier 130 .} That is, the sensing unit 120 may mean a means for sensing the _{noise current I n on the large current paths 111 and 112 .} At least a portion of the high current paths 111 and 112 may pass through the sensing unit 120 for sensing the noise current I _{n , but the portion where the output signal is generated by sensing in the sensing unit 120 is the large current} It may be insulated from the paths 111 and 112 . For example, the sensing unit 120 may be implemented as a sensing transformer. For example, the sensing unit 120 may be in the form of a CM choke wound with a power line corresponding to the large current paths 111 and 112 and a wire wound on the side of the amplifying unit 130 . The sensing transformer may sense _{the noise current I n} on the high current paths 111 and 112 in a state insulated from the high current paths 111 and 112 .

According to an embodiment, the sensing unit 120 may be differentially connected to the input terminal of the amplifying unit 130 .

The amplifying unit 130 may be electrically connected to the sensing unit 120 to amplify the output signal output by the sensing unit 120 to generate an amplified output signal. In the present invention, 'amplification' by the amplification unit 130 may mean adjusting the size and/or phase of the amplification target. The amplifying unit 130 may be implemented by various means, and may include an active element. In an embodiment, the amplifying unit 130 may include an OP-AMP. For example, the amplifier 130 may include a plurality of passive elements such as resistors and capacitors in addition to the OP-AMP. In another embodiment, the amplifier 130 may include a bipolar junction transistor (BJT). For example, the amplifier 130 may include a plurality of passive elements such as resistors and capacitors in addition to the BJT. However, the present invention is not limited thereto, and the means for 'amplification' described in the present invention may be used without limitation as the amplifying unit 130 of the present invention. The reference potential (reference potential 2) of the amplifying unit 130 and the reference potential (reference potential 1) of the compensating device 100 may be different potentials.

The amplifying unit 130 receives power from the third device 400 that is distinguished from the first device 300 and/or the second device 200, and amplifies the output signal output by the sensing unit 120 to amplify it. current can be generated. In this case, the third device 400 may be a device that receives power from a power source unrelated to the first device 300 and the second device 200 to generate input power for the amplifier 130 . Optionally, the third device 400 may be a device that receives power from any one of the first device 300 and the second device 200 and generates the input power of the amplifier 130 .

The output signal amplified by the amplifying unit 130 may be input to the first compensating unit 140 and the second compensating unit 160 . For example, the amplified current output from the amplifying unit 130 may flow toward the first compensating unit 140 and the second compensating unit 160 , respectively. For example, the amplifying unit 130 includes a first amplifying unit that outputs a first amplified current (or a first amplified voltage) to the first compensating unit 140 and a second amplifying unit to the second compensating unit 160 . It may be composed of a second amplifying unit that outputs a current (or a second amplified voltage).

The active compensation apparatus 100 according to an embodiment of the present invention includes a first compensation unit 140 and a second compensation unit 160 .

The first compensator 140 is a compensator of a type that compensates a voltage in front of or behind the CM choke in preparation for noise input from the side of the first device 300 . The second compensator 160 is a feedback type compensator that compensates the noise by returning to the rear end.

The first compensator 140 may generate a compensation voltage in series on the large current paths 111 and 112 based on the amplified voltage output from the amplification unit 130 . The output side of the first compensator 140 may generate a compensation voltage in series in the large current paths 111 and 112 , but may be insulated from the amplification unit 130 . For example, the first compensating unit 140 may be formed of a compensating transformer for the insulation. For example, an output signal (eg, an output voltage) of the amplifier 130 may be applied to a primary side of the compensation transformer, and a compensation voltage based on the output signal may be generated to a secondary side of the compensation transformer. The compensation voltage may have an effect of suppressing the _{noise current I n} flowing on the large current paths 111 and 112 .

The second compensator 160 may generate a compensation current based on an output signal amplified by the amplifying unit 130 and output to the second compensating unit 160 . The second compensator 160 may be connected to the high current paths 111 and 112, respectively, so that a compensation current flows from the high current paths 111 and 112 to the reference potential 1. For example, in the second compensation unit 160 , the compensation current may be branched from the large current paths 111 and 112 . Through this, it is possible to compensate the _{noise current I n} flowing on the large current paths 111 and 112 . The output side of the second compensator 160 _{may be connected to the high current paths 111 and 112 in order to compensate the noise current I n} on the high current paths 111 and 112 , but may be insulated from the amplifying unit 130 . For example, the second compensator 160 may include a compensating transformer for the insulation. For example, the output voltage of the amplifier 130 may be applied to the primary side of the compensating transformer, and a compensating current based on the change in the output voltage may be generated at the secondary side of the compensating transformer. The compensation current is at least part of the noise current I _n the ground: the flow (such as a reference potential. 1), it is possible to reduce the noise current I _n.

As described above, the active compensation apparatus 100 according to various embodiments of the present invention may have a structure in which voltage compensation and current compensation are combined. For example, the first compensator 140 may compensate for voltage while the second compensator 160 may compensate for current.

FIG. 2 shows a more specific example of the embodiment shown in FIG. 1 , and schematically shows an active compensation device 100A according to an embodiment of the present invention. The active compensation apparatus 100A may include a sensing unit 120 , a first amplifying unit 131 , a second amplifying unit 132 , a first compensating unit 140 , and a second compensating unit 160 . .

The large current paths 111 and 112 , the sensing unit 120 , the first compensating unit 140 and the second compensating unit 160 , and the third device 400 are shown in relation to the active compensation device 100A of FIG. 2 . , the reference potential 1, and the description of the reference potential 2 correspond to the description of FIG. 1 .

Also, in FIG. 2 and the following drawings, the first device 300 and the second device 200 may be omitted. That is, the high current paths 111 and 112 of the front end (eg, the first compensator 140 side) of the active compensation device 100A may be connected to the power line of the second device 200 , and the rear end (eg, the second The high current paths 111 and 112 of the compensator 160 side) may be connected to a power line of the first device 300 .

The active compensation apparatus 100A according to an embodiment of the present invention may include a first amplifier 131 and a second amplifier 132 .

The sensing unit 120 may sense the noise current I _n on the large current paths 111 and 112 to generate an output signal toward the first amplifying unit 131 and the second amplifying unit 132 . The output signal may correspond to a voltage between nodes a and b. Nodes a and b may be differentially connected to the input terminal of the first amplifier 131 , and may also be differentially connected to the input terminal of the second amplifier 132 . Accordingly, the voltage between the nodes a and b may be input to the first amplifying unit 131 and the second amplifying unit 132 as an input voltage.

The first amplifying unit 131 and the second amplifying unit 132 may respectively amplify the input voltage and output separate output signals (eg, output voltages). In this case, the gain (eg, voltage gain) of the first amplifying unit 131 and the gain (eg, voltage gain) of the second amplifying unit 132 may be different from each other.

_{The amplified voltage V 1} output from the first amplifying unit 131 becomes an input signal of the first compensating unit 140 , and the first compensating unit 140 receives the large current paths 111 and 112 based on _{the V 1 .} A compensation voltage can be generated in series on the

_{The amplified voltage V 2} output from the second amplifying unit 132 becomes an input signal of the second compensating unit 160 . The second compensator 160 may reduce the _{noise current I n} by flowing a compensation current from the large current paths 111 and 112 to the reference potential 1 based on _{the V 2 .}

Although the first amplification unit 131 and the second amplification unit 132 are expressed separately in terms of function, according to an embodiment, the first amplification unit 131 and the second amplification unit 132 are implemented as a single IC. It is possible.

On the other hand, the first compensating unit 140 and the second compensating unit 160 are respectively a compensation transformer to insulate the large current paths 111 and 112 from the first amplifying unit 131 and the second amplifying unit 132 . may include.

3 shows a more specific example of the embodiment shown in FIG. 2 , and schematically shows an active compensation device 100B according to an embodiment of the present invention.

The active compensation device 100B may actively compensate _{the noise current I n} or the noise voltage V _n input in a common mode to each of the two large current paths 111 and 112 connected to the first device 300 .

Referring to FIG. 2 , the active compensation device 100B includes a sensing transformer 120B, a first amplifier 131B, a second amplifier 132B, and a second amplifier disposed on the output side of the first amplifier 131B. It may include a first compensation transformer 140B, a second compensation transformer 161B and a compensation capacitor part 162B disposed on the output side of the second amplifier 132B.

In an embodiment, the above-described sensing unit 120 may include a sensing transformer 120B. At this time, the sensing transformer 120B is insulated from the large current paths 111 and 112, and the voltage induced at both ends of the sensing transformer 120B due to _{the noise current I n} or the noise current I _{n on the large current paths 111 and 112 is insulated.} may be a means for detecting The sensing transformer 120B is induced at both ends of the sensing transformer 120B due _{to the noise current I n} or the noise current I _n input to the large current paths 111 and 112 (eg, power line) from the first device 300 side. voltage can be sensed.

The sensing transformer 120B includes a primary side 121 disposed on the high current paths 111 and 112 and a secondary side 122 differentially connected to the input terminals of the amplifiers 131B and 132B. can do. The sensing transformer 120B is disposed on the secondary side 122 based on the magnetic flux density induced by the _{noise current I n} in the primary side 121B (eg, the primary winding) disposed on the high current paths 111 and 112 . ) (e.g. secondary windings) can generate induced currents or induced voltages. The primary side 121 of the sensing transformer 120B may be, for example, a winding in which the first large current path 111 and the second large current path 112 are wound on one core, respectively.

According to an embodiment of the present invention, the sensing transformer 120B is a CM choke in which the first large current path 111 and the second large current path 112 are wound, and the secondary side 122 electric wire is overwound. can be In this way, when the sensing transformer 120B is formed using the CM choke, the sensing transformer 120B may serve as a passive filter as the CM choke as well as sensing and transforming functions. That is, when the formation of the secondary side 122 standing sensing roll transient wire transformer (120B) to the CM choke, sensing transformer (120B) is suppressed with the sensing and variable pressure of the noise current I _n, I _n the noise current or It can play a deterrent role at the same time. Meanwhile, active compensation devices 100, 100A, 100B, 100C-1, and 100C-2 according to various embodiments of the present invention are added together with the above-described CM choke, so that even in a high-power system, the size or number of CM chokes is common without increasing. Mode noise voltage and current can be effectively reduced.

_{Specifically, the sensing transformer 120B includes a magnetic flux density induced by a noise current I n} on the first large current path 111 (eg, live line) and a noise current on the second large current path 112 (eg, a neutral line). The magnetic flux density induced by I _n may be configured to overlap (or reinforce) each other. At this time, large currents I21 and I22 also flow on the large current paths 111 and 112, and the magnetic flux density induced by the large current I21 on the first large current path 111 and the large current on the second large current path 112 ( The magnetic flux densities induced by I22) may be configured to cancel each other. _{Also, for example, the sensing transformer 120B has a magnitude of magnetic flux density induced by a noise current I n} of a first frequency band (eg, a band having a range of 150 KHz to 30 MHz) in a second frequency band (eg, For example, it may be configured to be larger than the magnitude of the magnetic flux density induced by the large currents I21 and I22 of a band having a range of 50Hz to 60Hz.

As such, the sensing transformer 120B is configured such that the magnetic flux densities induced by the large currents I21 and I22 can cancel each other, so that only the _{noise current I n can be sensed.} That is, the voltage induced to the secondary side 122 of the sensing transformer 120B may be a voltage obtained by converting the induced voltage of the primary side 121 according to the _{noise current I n at a certain ratio.}

For example, in the sensing transformer 120B, the turns ratio of the primary side 121 and the secondary side 122 is 1:N _sen, and the self-inductance of the primary side 121 of the sensing transformer 120B is L _{Speaking of sen} , the secondary side 122 may have a self-inductance of _{N sen} ² L _{sen .} For example, the primary side 121 and the secondary side 122 of the sensing transformer 120B may be coupled by a predetermined coupling coefficient.

For example, if the voltage induced at both ends of the primary side 121 of the sensing transformer 120B due to the _{noise current I n is V choke , the voltage V sen} induced in the secondary side 122 is V _choke of N _sen times.

Meanwhile, the secondary side 122 of the sensing transformer 120B may be connected in parallel with the input terminal of the first amplifier 131B and the input terminal of the second amplifier 132B. For example, the secondary side 122 of the sensing transformer 120B is differentially connected in parallel with the input end of the first amplifying unit 131B and the input end of the second amplifying unit 132B, the first amplifying unit 131B and The induced voltage V _sen may be supplied to the second amplifier 132B.

The first amplifying unit 131B and the second amplifying unit 132B may be an example of the above-described amplifying unit 130 , and correspond to the above-described first amplifying unit 131 and second amplifying unit 132 , respectively. can do. Each of the first amplifying unit 131B and the second amplifying unit 132B may amplify an induced voltage V _sen that is sensed by the sensing transformer 120B and induced in the secondary side 122 , respectively. For example, the amplification units 131B and 132B may _{amplify the magnitude of the induced voltage V sen} at a certain ratio and/or adjust the phase.

A first voltage gain of the amplifying section (131B) the voltage gain G ₁ and the second amplifier (132B) of the G ₂ may be different from each other. According to an embodiment of the present invention, the voltage gain G ₂ of the second amplifying unit 132B may be designed to be greater than _{the voltage gain G 1} of the first amplifying unit 131B. A detailed description thereof will be provided later. However, the present invention is not limited thereto, and G ₁ and G ₂ may be determined according to various embodiments.

The output voltage V ₁ of the first amplifier 131B may be expressed as in Equation 2 below.

The output voltage V ₁ of the first amplifier 131B becomes the input voltage of the first compensation transformer 140B. That is, the output voltage V ₁ of the first amplifier section (131B) is the primary side 141, the voltage of the first compensation transformer (140B), the first compensation transformer (140B) on the basis of V ₁ 2 primary side ( _{142), a compensation voltage V inj1} may be generated in series on the high current paths 111 and 112 .

The first compensation transformer 140B may correspond to the above-described first compensation unit 140 . The first compensation transformer 140B may be a means for insulating the amplification units 131B and 132B including active elements from the large current paths 111 and 112 . That is, the first compensation transformer 140B is insulated from the large current paths 111 and 112 , and _{based on the output voltage V 1 of the first amplifier 131B, the compensation voltage V inj1} is applied to the large current paths 111 and 112 . Induction, it may be a means for voltage compensation.

The first compensation transformer 140B may have, for example, a structure in which the primary side 141 and the secondary side 142 wires pass through one core or are wound at least once. The primary side 141 wire is a wire through which the output signal of the first amplifying unit 131B flows, and the secondary side 142 wire may correspond to the high current paths 111 and 112 .

The first compensation transformer 140B may induce a _{compensation voltage V inj1} on the high current paths 111 and 112 that are the secondary side 142 based _{on the amplified voltage V 1 generated on the primary side 141 .}

For example, in the first compensation transformer 140B, if the turns ratio of the primary side 141 and the secondary side 142 is 1:N _{inj1 , the voltage V inj1} induced in the secondary side 142 is V ₁ times N _inj1. Accordingly, the compensation voltage V _inj1 may be expressed as in Equation 3 .

Meanwhile, when the voltage gain of the second amplifying unit 132B is G ₂ , the output voltage V ₂ of the second amplifying unit 132B may be expressed as Equation 4 below.

_{The output voltage V 2} of the second amplifier 132B becomes the input voltage of the second compensator 160 , that is, the input voltage of the second compensation transformer 161B.

A configuration in which the second compensation transformer 161B and the compensation capacitor unit 162B are combined may correspond to the above-described second compensation unit 160 . _{The output voltage V 2} of the second amplifying unit 132B becomes a primary-side voltage of the second compensation transformer. The second compensation transformer 161B may be a means for insulating the amplification units 131B and 132B, including active elements, from the large current paths 111 and 112 . That is, the second compensation transformer 161B is insulated from the large current paths 111 and 112, and generates a compensation current Icy for branching from the large current paths 111 and 112 on the secondary side of the second compensation transformer 161B. It may be a means to

The second compensation transformer 161B has a primary side that is differentially connected to the output terminal of the second amplifying unit 132B, and a secondary connected through the large current paths 111 and 112 and the compensation capacitor unit 162B. side may be included.

The second compensation transformer 161B may induce an induced voltage V ₃ on the _{secondary side based on the amplified voltage V 2 generated on the primary side.} For example, in the second compensation transformer 161B, if the turns ratio of the primary side and the secondary side is 1:N _{inj2 , the voltage V 3} induced in the secondary side is N _inj2 times of V _{2 .} Therefore, the induced voltage V ₃ can be expressed as in Equation 5.

The secondary side of the second compensation transformer 161B may be disposed on a path connecting a compensation capacitor unit 162B, which will be described later, and a reference potential (reference potential 1) of the compensation device 100B. That is, one end of the secondary side of the second compensation transformer 161B is connected to the large current paths 111 and 112 through the compensation capacitor unit 162B, and the other end of the secondary side is the active compensation device 100B. It can be connected to the reference potential (reference potential 1). Meanwhile, the primary side of the second compensation transformer 161B, the primary side 141 of the first compensation transformer 140B, the amplifiers 131B and 132B, and the secondary side 122 of the sensing transformer 120B. may be connected to a reference potential (reference potential 2) that is distinguished from the remaining components of the active compensation device 100B. A reference potential (reference potential 1) of the compensating device 100B and a reference potential (reference potential 2) of the amplifiers 131B and 132B may be distinguished.

As described above, according to the present invention, the component generating the compensation current can be operated in an insulated state by using a reference potential different from that of the other components and using a separate power source for the component generating the compensation current. Reliability of the active compensation device 100B may be improved.

_{The voltage V 3} converted by the second compensation transformer 161B may draw a _{compensation current I cy} from the large current paths 111 and 112 (eg, a power line) through the compensation capacitor unit 162B.

The compensation capacitor unit 162B may provide a path through which at least a portion of the noise current on the high current paths 111 and 112 is drawn to the secondary side of the second compensation transformer 161B.

Compensation capacitor unit 162B, one end is connected to the secondary side of the second compensation transformer 161B, the other end is connected to the large current path (111, 112) two Y-capacitor (Y-capacitor, Y) -cap) may be included. One end of each of the two Y-caps shares a node connected to the secondary side of the second compensation transformer 161B, and opposite ends of each of the two Y-caps have a first large current path 111 and a second It may have a node connected to the high current path 112 .

The compensation capacitor unit 162B may draw a _{compensation current I cy} from the power line based _{on the voltage V 3} induced by the second compensation transformer 161B. When the compensation current I _cy compensates (or cancels) the noise current on the large current paths 111 and 112 , the compensation device 100B may reduce noise.

On the other hand, the common mode noise voltage of the node where the compensation capacitor unit 162B meets the large current paths 111 and 112 is V _n , and the voltage between the first compensation transformer 140B and the second device 200 is V _LISN , and solving the circuit equation between _{V n} and V _{LISN gives Equation 6 below.} V _n and V _LISN may represent potentials with respect to reference potential 1 (eg, ground).

Meanwhile, since the noise emitted toward the second device 200 by the operation of the active compensation device 100B should almost correspond to zero, V _LISN should correspond to zero, and Equation 7 below can be derived.

Meanwhile, using this, the effective impedance of the large current paths 111 and 112 at the point between the sensing transformer 120B and the compensation capacitor unit 162B may be calculated as in Equation 8.

' 배 증가된 효과를 가지는 것을 나타낸다. In Equation 8, s*L _choke may represent the impedance of the CM choke included in the sensing transformer 120B. Thus Z _{line, eff,} the impedance than the impedance of the _choke L s * on the CM choke (V _n as seen from the point), a high current path (111, 112),

' indicates that it has a doubled effect.

This may be an effect of the first amplifying unit 131 (eg, the first amplifying unit 131B) and the first compensating unit 140 (eg, the first compensation transformer 140B). The first amplifying unit 131 and the first compensating unit 140 may perform voltage compensation (V _inj1 ) on the large current path, which has an effect corresponding to the effect of increasing the inductance, thereby suppressing the noise current from flowing. You can (L boost type).

'배 증가된 실효 인덕턴스 L_choke,eff의 효과를 가질 수 있으므로(수학식 9), CM 초크만 존재할 때보다 노이즈 억제 효과를 증가시킬 수 있다. In other words, the active compensation device 100B according to the embodiment of the present invention, the inductance L _choke of the CM choke '

Since it is possible to have the effect of 'fold increased effective inductance L _choke,eff (Equation 9), it is possible to increase the noise suppression effect than when only the CM choke is present.

For example, the noise suppression effect may be adjusted according to _{the voltage gain G 1 of the first amplifier 131B, the turns ratio N sen} of the sensing transformer 120B, and the turns _{ratio N inj1} of the first compensation transformer 140B.

Meanwhile, when the circuit equation between the reference potential 1 from the _{node V n} where the compensation capacitor unit 162B meets the large current paths 111 and 112 is solved, Equation 10 is obtained.

Here, C _y is the capacitance of the Y-capacitor included in the compensation capacitor unit 162B. _{Meanwhile, using this, the effective Y-impedance Z cy,eff viewed from the node V n} where the compensation capacitor unit 162B and the large current paths 111 and 112 meet toward the compensation capacitor unit 162B is expressed as in Equation 11 can be calculated.

Equation 11 is obtained by substituting Equation 7 into _{V choke.} In Equation 11, 1/(s*C _y ) represents the impedance of the Y-capacitor included in the compensation capacitor unit 162B. Z _cy,eff represents an effective Y-impedance viewed from the node where the compensation capacitor part 162B and the large current paths 111 and 112 meet toward the compensation capacitor part 162B.

'배 감소된 효과를 가지는 것을 나타낸다. Referring to Equation 11, the effective Y-impedance Z _cy,eff is higher than the impedance 1/(s*C _{y ) of the Y-capacitor.}

' indicates that it has a fold-reduced effect.

This may be an effect by the second amplifying unit 132 (eg, the second amplifying unit 132B) and the second compensating unit 160 (eg, the first compensation transformer 161B and the compensation capacitor unit 162B). have. The second amplifying unit 132 and the second compensating unit 142 may perform current compensation (I _cy ) such that the noise current is branched from the large current path in a feedback type, which increases the Y-capacitance. By giving an effect corresponding to , noise can be effectively extracted to the ground (ie, reference potential 1) (C boost type).

'배 증가된 실효 Y-커패시턴스 C_y,eff의 효과를 가질 수 있으므로(수학식 12), Y-커패시턴스만 존재할 때보다 노이즈 인출 효과를 증가시킬 수 있다. In other words, the active compensation device 100B according to an embodiment of the present invention, the capacitance C _y of the Y-capacitor is '

Since it is possible to have the effect of 'fold increased effective Y-capacitance C _y,eff (Equation 12), it is possible to increase the noise extraction effect compared to when only the Y-capacitance exists.

For example, the noise take-off effect of the first voltage gain of the amplifier (131B) G _1, the second amplifier turns ratio N _inj1, a second compensation of the voltage gain G _2, the first compensation transformer (140B) of the (132B) transformer ( 161B) according to the turns ratio N _inj2 .

For example, in the first compensation transformer 140B, the primary side 141 wires pass through the core, and the secondary side 142 wires (ie, the high current paths 111 and 112) pass through the core or once. It can be formed to be rolled.

4 to 6 schematically illustrate active compensation devices 100C-1, 100C-2, and 100C-3 according to an embodiment of the present invention, as specific examples of the active compensation device shown in FIG. 3 . .

The compensation device 100C-1 according to the embodiment shown in FIG. 4 includes a sensing transformer 120C, a first amplifier 131C, a second amplifier 132C, a first compensation transformer 140C-1, and a second It may include two compensation transformers 161C and a compensation capacitor unit 162C.

The compensation device 100C-2 according to an embodiment shown in FIG. 5 includes a sensing transformer 120C, a first amplifier 131C, a second amplifier 132C, a first compensation transformer 140C-2, and a second It may include two compensation transformers 161C and a compensation capacitor unit 162C.

The compensating device 100C-1 shows an embodiment in which the primary side electric wire and the secondary side large current paths 111 and 112 of the first compensating transformer 140C-1 pass through the core, and the turns ratio N _inj1 is about 1 may be to the extent

The compensating device 100C-2 shows an embodiment in which the primary side wire of the first compensating transformer 140C-2 passes through the core and the secondary side large current paths 111 and 112 wind the core once. The turns ratio N _inj1 may be about two.

4 and 5, the sensing transformer 120C, the first amplifier 131C, the second amplifier 132C, the first compensation transformers 140C-1 and 140C-2, the second compensation transformer 161C, and the compensation capacitor The unit 162C includes the sensing transformer 120B, the first amplifier 131B, the second amplifier 132B, the first compensating transformer 140B, the second compensating transformer 161B, and the compensating capacitor unit described with reference to FIG. 3 ( 162C). 162B).

4 and 5 , in the active compensation devices 100C-1 and 100C-2 according to an embodiment of the present invention, the sensing transformer 120C includes the first compensation transformers 140C-1 and 140C-2. ) and the second compensation transformer 161C may be a different type of device.

For example, unlike the first compensation transformers 140C-1 and 140C-2 and the second compensation transformer 161C, which only serve as transformers, the sensing transformer 120C corresponds to the large current paths 111 and 112. The CM choke on which the power line is wound may be in a form in which the electric wire on the side of the amplification units 131C and 132C is overwound. The CM choke is a passive filter, and may serve to suppress a noise current by using an inductance, and the sensing transformer 120C may sense the noise by simply winding a secondary side wire to the CM choke.

On the other hand, the compensation device 100C-3 according to the exemplary embodiment shown in FIG. 6 includes a sensing transformer 120C, a first amplifier 131C, a second amplifier 132C, and a first compensation transformer 140C-3. , a second compensation transformer 161C, and a compensation capacitor unit 162C.

The active compensation apparatus 100C-3 according to an exemplary embodiment may actively compensate _{the noise current I n} or the noise voltage V _{n generated in the common mode in the large current paths 111 and 112 .}

The sensing transformer 120C, the first amplifier 131C, the second amplifier 132C, the first compensation transformer 140C-3, the second compensation transformer 161C, and the compensation included in the active compensation device 100C-3. The capacitor unit 162C includes the sensing transformer 120B, the first amplifier 131B, the second amplifier 132B, the first compensation transformer 140B, the second compensation transformer 161B, and the compensation capacitor part described with reference to FIG. 3 . It may correspond to the description of (162B).

In the active compensation device 100C-3 according to an embodiment, the first compensation transformer 140C-3 is the sensing transformer 120C (eg, CM) on the side of the first device 300 with respect to the sensing transformer 120C. can be placed behind the choke). The first compensation transformer 140C-3 may generate a _{compensation voltage V inj1} on the high current paths 111 and 112 between the CM choke and the first device 300 .

7 schematically shows the configuration of a system including an active compensation device 100D according to another embodiment of the present invention. Hereinafter, descriptions of contents overlapping with those described with reference to FIG. 3 will be omitted.

Referring to FIG. 7 , the active compensation device 100D may actively compensate _{the noise current I n} input in a common mode to each of the high current paths 111D, 112D, and 113D connected to the first device 300D.

To this end, the active compensation device 100D according to another embodiment of the present invention includes three large current paths 111D, 112D, and 113D, a sensing transformer 120D, a first amplifier 131D, and a second amplifier 132D. ), the first compensation transformer 140D disposed on the output side of the first amplifier 131D, the second compensation transformer 161D and the compensation capacitor part 162D disposed on the output side of the second amplifier 132D. may include.

In comparison with the active compensation device 100B according to the embodiment described in FIG. 3, the active compensation device 100D according to the embodiment shown in FIG. 7 includes three large current paths 111D, 112D, and 113D, Accordingly, there is a difference between the sensing transformer 120D, the first compensation transformer 140D, and the compensation capacitor unit 162D. Therefore, the active compensation apparatus 100D will be described below with a focus on the above-described differences.

The active compensation device 100D may include a first large current path 111D, a second large current path 112D, and a third large current path 113D that are separated from each other. According to an embodiment, the first large current path 111D may be an R-phase power line, the second large current path 112D may be an S-phase power line, and the third large current path 113D may be a T-phase power line. The noise current I _n may be input to each of the first large current path 111D, the second large current path 112D, and the third large current path 113D in a common mode.

The primary side 121D of the sensing transformer 120D is disposed in each of the first large current path 111D, the second large current path 112D, and the third large current path 113D, and the induced voltage is applied to the secondary side 122D. V _sen can be created. The magnetic flux density generated in the sensing transformer 120D by _{the noise current I n} on the three large current paths 111D, 112D, and 113D may be reinforced with each other.

Meanwhile, in the active compensation device 100D, the first and second amplifying units 131D and 132D correspond to the amplifying units 131B and 132B. For example, the secondary side 122D wire of the sensing transformer 120D may be connected in parallel to each of the first amplifying unit 131D and the second amplifying unit 132D. _{The voltage V sen} induced in the secondary side 122D of the sensing transformer 120D becomes the input voltage of the first amplifier 131D and the second amplifier 132D. The first amplifying unit 131D may _{output an amplified voltage V 1} based on the input voltage, and the second amplifying unit 132D may output _{an amplified voltage V 2 based on the input voltage.}

The V ₁ may be the input voltage of the first compensation transformer 140D, that is, the voltage of the primary side 141D of the first compensation transformer 140D. The V ₂ may be the input voltage of the second compensation transformer 161D, that is, the primary side voltage of the second compensation transformer 161D.

Meanwhile, the secondary side 142D of the first compensation transformer 140D may be disposed in each of the first large current path 111D, the second large current path 112D, and the third large current path 113D. The first compensation transformer 140D, the primary side 141D voltage (V ₁ ) output from the first amplifying unit 131D, based on the secondary side 142D, three large current paths 111D, 112D, 113D) can generate a _{compensation voltage V inj1} in series with each.

Meanwhile, the second compensation transformer 161D and the compensation capacitor unit 162D are included in the second compensation unit 160D, and the output voltage V ₂ of the second amplification unit 132D is an input of the second compensation unit 160D. It may be a voltage, that is, a voltage of the primary side 141D of the second compensation transformer 161D. The second compensation transformer 161D may generate an _{induced voltage V 3} on the secondary side based on the _{primary side voltage V 2 .}

The secondary side of the second compensation transformer 161D may be disposed on a path connecting the compensation capacitor unit 162D and the reference potential (reference potential 1) of the compensation device 100D.

The compensation capacitor unit 162D has three Y-capacitors (Y-) having one end connected to the secondary side of the second compensation transformer 161D and the other end connected to each of the large current paths 111D, 112D, and 113D. capacitor, Y-cap).

The compensation capacitor unit 150D is formed from each of the first large current path 111D, the second large current path 112D, and the third large current path 113D based on the _{secondary-side induced voltage V 3 of the second compensation transformer 161D.} The compensating current I _c is drawn to the reference potential 1.

The active compensation apparatus 100D according to this embodiment may simultaneously perform voltage compensation and current compensation for common mode noise on a power line of a 3-phase 3-wire power system.

8 schematically shows the configuration of a system including an active compensation device 100E according to another embodiment of the present invention. Hereinafter, descriptions of contents overlapping with those described with reference to FIG. 3 will be omitted.

Referring to FIG. 7 , the active compensation device 100E may actively compensate _{the noise current I n} input in a common mode to each of the high current paths 111E, 112E, 113E, and 114E connected to the first device 300E. .

To this end, the active compensation device 100E according to an embodiment of the present invention includes four large current paths 111E, 112E, 113E, 114E, a sensing transformer 120E, a first amplifier 131E, and a second amplifier ( 132E), the first compensation transformer 140E disposed on the output side of the first amplifying unit 131E, the second compensation transformer 161E and the compensation capacitor unit 162E disposed on the output side of the second amplifying unit 132E ) may be included.

In comparison with the active compensation device 100B according to the embodiment described in FIG. 3 , the active compensation device 100E according to the embodiment shown in FIG. 8 includes four large current paths 111E, 112E, 113E, and 114E. Accordingly, there is a difference between the sensing transformer 120E, the first compensation transformer 140E, and the compensation capacitor unit 162E. Therefore, the active compensation device 100E will be described below with a focus on the above-described differences.

The active compensation apparatus 100E may include a first large current path 111E, a second large current path 112E, a third large current path 113E, and a fourth large current path 114E, which are separated from each other. According to an embodiment, the first high current path 111E is R-phase, the second large current path 112E is S-phase, the third large current path 113E is T-phase, and the fourth large current path 114E. may be an N-phase power line. The noise current I _n may be input to each of the first, second, third, and fourth large current paths 111E, 112E, 113E, and 114E in a common mode.

The primary side 121E of the sensing transformer 120E is disposed in each of the first large current path 111E, the second large current path 112E, the third large current path 113E, and the fourth large current path 114E, _{An induced voltage V sen} may be generated on the secondary side 122E. The magnetic flux density generated in the sensing transformer 120E by _{the noise current I n} on the four large current paths 111E, 112E, 113E, and 114E may be reinforced with each other.

Meanwhile, in the active compensation device 100E, the first and second amplifying units 131E and 132E correspond to the amplifying units 131B and 132B. For example, the secondary side 122E wire of the sensing transformer 120E may be connected in parallel to each of the first amplifying unit 131E and the second amplifying unit 132E. _{The voltage V sen} induced in the secondary side 122E of the sensing transformer 120E becomes the input voltage of the first amplifying unit 131E and the second amplifying unit 132E. The first amplifying unit 131E may _{output an amplified voltage V 1} based on the input voltage, and the second amplifying unit 132E may output _{an amplified voltage V 2 based on the input voltage.}

The V ₁ may be the input voltage of the first compensation transformer 140E, that is, the voltage of the primary side 141E of the first compensation transformer 140E. The V ₂ may be the input voltage of the second compensation transformer 161E, that is, the primary side voltage of the second compensation transformer 161E.

Meanwhile, the secondary side 142E of the first compensation transformer 140E has a first large current path 111E, a second large current path 112E, a third large current path 113E, and a fourth large current path 114E, respectively. can be placed in _{The first compensation transformer 140E, on the basis of the primary side 141E voltage (V 1} ) output from the first amplifying unit 131E, the secondary side 142E, four large current paths 111E, 112E, _{A compensation voltage V inj1} can be generated in series with each of 113E and 114E).

Meanwhile, the second compensation transformer 161E and the compensation capacitor unit 162E are included in the second compensation unit 160E, and the output voltage V ₂ of the second amplification unit 132E is an input of the second compensation unit 160E. It may be a voltage, that is, a voltage of the primary side 141E of the second compensation transformer 161E. The second compensation transformer 161E may generate an _{induced voltage V 3} on the secondary side based on the _{primary side voltage V 2 .}

The secondary side of the second compensation transformer 161E may be disposed on a path connecting the compensation capacitor unit 162E and the reference potential (reference potential 1) of the compensation device 100E.

Compensation capacitor unit 162E, one end is connected to the secondary side of the second compensation transformer 161E, the other end is connected to each of the large current paths (111E, 112E, 113E, 114E) four Y-capacitors ( Y-capacitor, Y-cap).

Compensation capacitor portion (150E) of the second first high current path on the basis of the secondary side induced voltage V ₃ of the compensation transformer (161E) (111E), the second high current path (112E), the third high current path (113E), and _{A compensation current I c} is drawn from each of the fourth large current paths 114E to the reference potential 1.

The active compensation apparatus 100E according to this embodiment may simultaneously perform voltage compensation and current compensation for common mode noise on a power line of a 3-phase 4-wire power system.

Unlike the case in which only the CM choke is used alone, the active compensation device according to various embodiments may be used for high power, but the degree of increase in size or the degree of increase in price may be insignificant.

In addition, since the active compensation device according to various embodiments of the present disclosure has a structure that is electrically insulated from a large current path (eg, a power line), it is possible to protect the elements included in the amplification unit 130 from electrical overstress (EOS). . For example, since the amplifier 130 according to various embodiments of the present disclosure is insulated from the power line, a DC low voltage (eg, the third device 400, within 48V) used in the control board may be used. Accordingly, the amplifying unit 130 does not require a separate power conversion circuit. In addition, the active compensation device according to various embodiments of the present invention is rated to configure the amplification unit 130 irrespective of the reference potential (reference potential 1) of the power supply device (eg, the second device 200 ). Low voltage devices can be used.

The specific implementations described in the present invention are only examples, and do not limit the scope of the present invention in any way. For brevity of the specification, descriptions of conventional electronic components, control systems, software, and other functional aspects of the systems may be omitted. In addition, the connection or connection members of the lines between the components shown in the drawings exemplarily represent functional connections and/or physical or circuit connections, and in an actual device, various functional connections, physical connections that are replaceable or additional may be referred to as connections, or circuit connections. In addition, unless there is a specific reference such as "essential" or "importantly", it may not be a necessary component for the application of the present invention.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and the scope of the spirit of the present invention is not limited to the scope of the scope of the present invention. will be said to belong to

Claims (6)

An active compensation device for actively compensating noise generated in a common mode in each of at least two or more large current paths connected to the first device, the active compensation device comprising:
at least two or more high current paths for transferring the high current supplied by the second device to the first device;
a sensing unit sensing a common mode noise current on the high current path to generate an output signal corresponding to the noise current;
an amplifying unit amplifying an output signal of the sensing unit to generate a first amplified voltage and a second amplified voltage;
a first compensator for generating a compensation voltage on the large current path based on the first amplified voltage; and
and a second compensator for branching and drawing a compensation current from the large current path based on the second amplified voltage. According to claim 1,
The first compensation unit is of a type that generates the compensation voltage on the large current path between the sensing unit and the second device,
The second compensating unit is of a feedback type for branching the compensating current from the large current path between the sensing unit and the first device. According to claim 1,
The sensing unit is a CM choke on which the two or more large current paths are wound, and an electric wire for generating the input voltage of the amplifying unit is wound over the CM choke. According to claim 1,
The first compensation unit,
The electric wire outputting the first amplified voltage of the amplifying unit passes through a core, and the large current path passes through the core or is formed to be wound one or more times. According to claim 1,
The amplifying unit includes a first amplifying unit for outputting the first amplified voltage and a second amplifying unit for outputting the second amplified voltage,
The first compensating unit includes a first compensating transformer,
and the second compensating unit includes a second compensating transformer configured to generate an induced voltage in a path from which the compensating current is drawn based on the second amplified voltage. 6. The method of claim 5,
The second compensating unit may further include a compensating capacitor unit including a Y-capacitor branched from the large current path and connected to a secondary side of the second compensating transformer.

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