Active filtering device, direct current power supply equipment and alternating current power supply equipment

Abstract

The utility model discloses an active filtering device, direct current power supply equipment and alternating current power supply equipment, which are applied to the technical field of electromagnetic compatibility, are used for solving the problems of poor filtering effect and low system efficiency of a filter in the prior art, and comprise a noise coupling module, a signal processing module and a compensation output module which are connected in sequence, the noise coupling module and the compensation output module are connected with the current carrier; the noise coupling module collects a noise signal on the current carrier; the signal processing module carries out filtering and reverse-phase amplification processing on the noise signal to obtain an initial compensation signal; and the compensation output module performs frequency selection matching processing on the initial compensation signal to obtain a target compensation signal, and outputs the target compensation signal to the current carrier. By generating the target compensation signal which is opposite to the noise signal in phase and equal to the noise signal in amplitude and outputting the target compensation signal to the current carrier, the noise signal is accurately and timely eliminated, the filtering effect of the filter is improved, an inductor, an X capacitor and a Y capacitor do not need to be arranged, and system efficiency reduction is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic compatibility especially relates to a kind of active filter device, direct current power supply equipment and alternating current power supply equipment. BACKGROUND

[0002] With the development of power electronics technology and the popularity of switching power supply, electromagnetic disturbance phenomenon in power system appears more and more frequently, among them, filter is the most effective means to solve electromagnetic disturbance.

[0003] At present, the general circuit structure of filter is the frequency selection network composed of inductance, X capacitor and Y capacitor and is connected in series on power loop, the filter performance of this filter is limited, the signal in certain specific frequency range cannot be effectively filtered, leading to poor filtering effect.In addition, due to the existence of magnetic loss and copper loss, inductance will consume certain energy, leading to the efficiency of power system to decline; due to the existence of X capacitor in differential mode filter, the phase of voltage naturally lags behind current, leading to the increase of reactive power of power system; due to the existence of Y capacitor in common mode filter, leakage current is generated in power system, and there is electric shock risk in the case of poor grounding. Therefore, the existing filter has the problems of poor filtering effect and low system efficiency. SUMMARY

[0004] The utility model provides a kind of active filter device, direct current power supply equipment and alternating current power supply equipment to solve the problem of poor filtering effect of filter in prior art and system efficiency reduction.

[0005] The technical scheme provided by the utility model is as follows:

[0006] On the one hand, the utility model provides active filter device, comprising: noise coupling module, signal processing module and compensation output module;

[0007] Noise coupling module, signal processing module and compensation output module are connected in series;Noise coupling module is also connected with current-carrying body and ground respectively;Compensation output module is also connected with current-carrying body;

[0008] Noise coupling module is used for collecting noise signal on current-carrying body;

[0009] Signal processing module is used for filtering and inverting amplification processing to noise signal, to obtain initial compensation signal;

[0010] Compensation output module is used for frequency matching processing to initial compensation signal, to obtain target compensation signal, and output target compensation signal to current-carrying body.

[0011] Optionally, noise coupling module includes: first capacitor, first resistor, second resistor and first voltage conversion submodule;

[0012] The first end of the first capacitor is connected to the current-carrying fluid, the second end of the first capacitor is connected to the ground through the first resistor, and the second end of the first capacitor is also connected to the first input end of the first voltage conversion submodule through the second resistor;

[0013] The second input end of the first voltage conversion submodule is connected to the ground, and the output end of the first voltage conversion submodule is connected to the corresponding input end of the signal processing module.

[0014] Optionally, the first voltage conversion submodule comprises a voltage transformer.

[0015] The first input end of the voltage transformer is connected to the second end of the first capacitor through the second resistor, the second input end of the voltage transformer is connected to the ground, and the output end of the voltage transformer is connected to the corresponding input end of the signal processing module.

[0016] Optionally, the first voltage conversion submodule comprises a first diode, a linear optocoupler and a third resistor.

[0017] The negative electrode of the first diode and the first input end of the linear optocoupler are both connected to the second end of the first capacitor through the second resistor, and the positive electrode of the first diode and the second input end of the linear optocoupler are both connected to the ground.

[0018] The first output end of the linear optocoupler is connected to the first input end of the signal processing module and the power supply through the third resistor respectively; the first output end of the linear optocoupler is also connected to the second input end of the signal processing module; and the second output end of the linear optocoupler is connected to the ground.

[0019] Optionally, the signal processing module comprises a second capacitor, a third capacitor, a fourth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an inverting operational amplifier.

[0020] The inverting input end of the inverting operational amplifier is connected to the first output end of the first voltage conversion submodule through the third capacitor and the second capacitor connected in series.

[0021] The non-inverting input end of the inverting operational amplifier is connected to the second output end of the first voltage conversion submodule and the ground through the fourth resistor respectively.

[0022] The output end of the inverting operational amplifier is connected to the input end of the compensation output module through the fifth resistor; the output end of the inverting operational amplifier is also connected to the inverting input end of the inverting operational amplifier through the sixth resistor; and the output end of the inverting operational amplifier is also connected to the connection point between the second capacitor and the third capacitor through the fourth capacitor.

[0023] The seventh resistor is arranged between the connection point between the second capacitor and the third capacitor and the ground.

[0024] Optionally, the compensation output module comprises a first filter submodule and a fifth capacitor.

[0025] The input end of the first filter submodule is connected with the output end of the signal processing module, and the output end of the first filter submodule is connected with the current-carrying body through the fifth capacitor.

[0026] Optionally, the compensation output module comprises a first filter submodule, a second filter submodule and a third filter submodule, wherein the frequency selection points of the first filter submodule, the second filter submodule and the third filter submodule are different.

[0027] The input end of the first filter submodule is connected with the output end of the signal processing module, the output end of the first filter submodule is connected with the current-carrying body through the second filter submodule, and the output end of the first filter submodule is also connected with the ground through the third filter submodule.

[0028] On the other hand, the utility model provides a kind of direct current power supply equipment, comprising: direct current power conversion device and multiple above active filter device;

[0029] The positive input end of the direct current power conversion device is connected with the positive output end of external direct current power supply, and the negative input end of the direct current power conversion device is connected with the negative output end of external direct current power supply;The ground end of the direct current power conversion device is connected with external ground wire;The positive output end of the direct current power conversion device is connected with the first end of external load, and the negative output end of the direct current power conversion device is connected with the second end of external load;

[0030] The active filter device is arranged on the input side and / or output side of the direct current power conversion device.

[0031] On the other hand, the utility model provides a kind of alternating current power supply equipment, comprising: alternating current power conversion device and multiple above active filter device;

[0032] The first input end, the second input end and the third input end of the alternating current power conversion device are respectively connected with the corresponding phase line in external alternating current power supply, and the ground end of the alternating current power conversion device is connected with external ground wire;The first output end of the alternating current power conversion device is connected with the first end of external load, and the second output end of the alternating current power conversion device is connected with the second end of external load;

[0033] The active filter device is arranged on the input side and / or output side of the alternating current power conversion device.

[0034] Optionally, the fourth input end of the alternating current power conversion device is connected with the zero line of external alternating current power supply.

[0035] The utility model has the advantages of the following:

[0036] The utility model discloses a kind of active filter devices, and the active filter device is connected to the current-carrying fluid, and the active filter device is connected to the current-carrying fluid by noise coupling module Real-time, non-invasively Collect noise signal on the current-carrying fluid, so that the collection process of noise signal has minimal impact on the current-carrying fluid connection electric system.

[0037] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the principles of the present application. In the drawings:

[0039] Figure 1 It is the first kind of structure schematic diagram of active filter device in the utility model embodiment;

[0040] Figure 2 It is the second kind of structure schematic diagram of active filter device in the utility model embodiment;

[0041] Figure 3 It is the third kind of structure schematic diagram of active filter device in the utility model embodiment;

[0042] Figure 4 It is the fourth kind of structure schematic diagram of active filter device in the utility model embodiment;

[0043] Figure 5 It is the fifth kind of structure schematic diagram of active filter device in the utility model embodiment;

[0044] Figure 6 It is the sixth kind of structure schematic diagram of active filter device in the utility model embodiment;

[0045] Figure 7 Figure 7 is a seventh structural schematic view of the active filter device in the embodiments of the present application;

[0046] Figure 8 Figure 4 is a structural schematic view of the direct current power supply device in the embodiments of the present application;

[0047] Figure 9 Figure 1 is a first structural schematic view of the alternating current power supply device in the embodiments of the present application;

[0048] Figure 10 Figure 2 is a second structural schematic view of the alternating current power supply device in the embodiments of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0050] The embodiments of the present application provide an active filter device 100, as shown in Figure 1 The active filter device 100 at least comprises a noise coupling module 110, a signal processing module 120 and a compensation output module 130.

[0051] The noise coupling module 110, the signal processing module 120 and the compensation output module 130 are connected in series; the noise coupling module 110 is further connected with a current-carrying body 140 and the ground; and the compensation output module 130 is further connected with the current-carrying body 140.

[0052] The noise coupling module 110 is used for collecting noise signals on the current-carrying body 140.

[0053] The signal processing module 120 is used for filtering and inverting amplification processing of the noise signals to obtain initial compensation signals.

[0054] The compensation output module 130 is used for frequency matching processing of the initial compensation signals to obtain target compensation signals, and outputs the target compensation signals to the current-carrying body 140.

[0055] In Figure 1In the shown active filter device 100, the current-carrying body 140 is a conductor for transmitting current, such as a wire, a cable, or a bus, etc., which is arranged between an external power source and an electrical equipment. The noise coupling module 110 non-invasively acquires a voltage signal on the current-carrying body 140 as a noise signal through coupling, and inputs the noise signal into the signal processing module 120. The signal processing module 120 filters out low-frequency signals in the noise signal, and then performs reverse processing and amplitude amplification on the noise signal to obtain an initial compensation signal. The compensation output module 130 performs frequency selection matching processing on the initial compensation signal, which refers to amplitude adjustment of a selected frequency point and impedance matching of the initial compensation signal. The amplitude adjustment of the selected frequency point is to adjust the amplitude of the target compensation signal at the selected frequency point to be consistent with that of the noise signal, so as to realize the output of the target compensation signal to the current-carrying body 140, and the target compensation signal and the noise signal on the current-carrying body 140 generate destructive interference, effectively suppressing the noise signal. The impedance matching is to set the impedance of the compensation output module 130 to be equal to the impedance of the electrical system connected to the current-carrying body 140, so as to ensure that the target compensation signal can be efficiently transmitted to the electrical system connected to the current-carrying body 140, and reduce reflection and loss.

[0056] The active filter device of the utility model acquires the noise signal on the current-carrying body in real time and non-invasively through the noise coupling module, so that the noise signal acquisition process has little effect on the electrical system. The noise signal is filtered and reverse amplified by the signal processing module, and finally the target compensation signal with opposite phase and equal amplitude to the noise signal is output by the compensation output module. The target compensation signal directly acts on the current-carrying body, realizing accurate and timely elimination of the noise signal. This active compensation mechanism can accurately and timely eliminate the noise signal on the current-carrying body, improve the filtering effect of the filter, and effectively filter electromagnetic noise and suppress common-mode noise and differential-mode noise. The active compensation mechanism of the active filter device can also be flexibly adjusted according to the frequency range and amplitude of the noise signal, so as to meet the filtering needs of various complex application scenarios. In addition, the active filter device of the utility model does not need to use inductors, X capacitors and Y capacitors and other elements commonly used in traditional filters. Based on the noise coupling module, the signal processing module and the compensation output module, the active compensation mechanism is used to eliminate the noise signal on the current-carrying body, improve the efficiency of the system, reduce the reactive power of the system, and reduce the risk of electric shock in the case of poor grounding.

[0057] In specific implementation, the noise coupling module in the active filter device has various structures to realize its functions, as shown in the following Figure 2 The noise coupling module 110 can include a first capacitor C1, a first resistor R1, a second resistor R2, and a first voltage conversion submodule 111.

[0058] The first terminal of the first capacitor C1 is connected to the current carrier 140, the second terminal of the first capacitor C1 is connected to ground via the first resistor R1, and the second terminal of the first capacitor C1 is also connected to the first input terminal of the first voltage conversion submodule 111 via the second resistor R2.

[0059] The second input terminal of the first voltage conversion submodule 111 is connected to ground, and the output terminal of the first voltage conversion submodule 111 is connected to the corresponding input terminal of the signal processing module 120.

[0060] exist Figure 2 In the active filter device 100 shown, the first capacitor C1 and the first resistor R1 are coupled together to collect the voltage signal on the current carrier 140 as a noise signal. The second resistor R2 acts as a current-limiting resistor, adjusting the current input to the first voltage conversion submodule 111, and together with the input impedance of the first voltage conversion submodule 111, determines the amplitude of the noise signal input to the first voltage conversion submodule 111. After receiving the noise signal after being divided by the second resistor R2, the first voltage conversion submodule 111 adjusts the voltage value of the noise signal and inputs the adjusted noise signal to the signal processing module 120. The first voltage conversion submodule 111 also serves to achieve electrical isolation between the noise coupling module 110 and the signal processing module 120.

[0061] In practical implementation, the first voltage conversion submodule in the noise coupling module has various structures to achieve its function; see [reference needed]. Figure 3 As shown, the first voltage conversion submodule 111 may include: a voltage transformer T;

[0062] The first input terminal of voltage transformer T is connected to the second terminal of the first capacitor C1 via the second resistor R2. The second input terminal of voltage transformer T is connected to ground. The output terminal of voltage transformer T is connected to the corresponding input terminal of signal processing module 120.

[0063] exist Figure 3 In the active filter device 100 shown, the first and second input terminals of the voltage transformer T are the high-voltage side terminals, and the output terminals of the voltage transformer T include a first output terminal and a second output terminal, which are the low-voltage side terminals. The first output terminal of the voltage transformer T is connected to the first input terminal of the signal processing module 120, and the second output terminal of the voltage transformer T is connected to the second input terminal of the signal processing module 120. The voltage transformer T reduces the voltage value of the received noise signal after being divided by the second resistor R2, and inputs the reduced-voltage noise signal to the signal processing module 120. The voltage transformer T achieves electrical isolation between the noise coupling module 110 and the signal processing module 120 through electromagnetic conversion.

[0064] In practical implementation, the first voltage conversion submodule 111 in the noise coupling module 110 has various structures to achieve its function, see [reference]. Figure 4 As shown, the first voltage conversion submodule 111 may include: a first diode D1, a linear optocoupler U1, and a third resistor R3;

[0065] The negative terminal of the first diode D1 and the first input terminal of the linear optocoupler U1 are both connected to the second terminal of the first capacitor C1 via the second resistor R2, and the positive terminal of the first diode D1 and the second input terminal of the linear optocoupler U1 are both connected to ground.

[0066] The first output terminal of the linear optocoupler U1 is connected to the first input terminal of the signal processing module 120 and the power supply via the third resistor R3; the first output terminal of the linear optocoupler U1 is also connected to the second input terminal of the signal processing module 120; the second output terminal of the linear optocoupler U1 is connected to ground.

[0067] exist Figure 4 In the active filter device 100 shown, the first diode D1 is used to limit the reverse voltage input to the linear optocoupler U1, protecting the linear optocoupler U1. The linear optocoupler U1 converts the received noise signal, after being divided by the second resistor R2, into an optical signal, and then converts the optical signal into a current signal through an internal photodiode. The linear optocoupler U1 achieves electrical isolation between the noise coupling module 110 and the signal processing module 120 through photoelectric conversion. The third resistor R3 converts the output current of the linear optocoupler U1 into a voltage signal, which is then input as a noise signal to the signal processing module 120 for further processing.

[0068] In practical implementation, the signal processing module in an active filter device has various structures to achieve its function; see [reference needed]. Figure 5 As shown, the signal processing module 120 may include: a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an inverting operational amplifier A1.

[0069] The inverting input terminal of the inverting operational amplifier A1 is connected to the first output terminal of the first voltage conversion submodule 111 via a third capacitor C3 and a second capacitor C2 connected in series.

[0070] The non-inverting input terminal of the inverting operational amplifier A1 is connected to the second output terminal of the first voltage conversion submodule 111 and ground via the fourth resistor R4.

[0071] The output terminal of the inverting operational amplifier A1 is connected to the input terminal of the compensation output module 130 via the fifth resistor R5; the output terminal of the inverting operational amplifier A1 is also connected to the inverting input terminal of the inverting operational amplifier A1 via the sixth resistor R6; the output terminal of the inverting operational amplifier A1 is also connected to the connection point between the second capacitor C2 and the third capacitor C3 via the fourth capacitor C4.

[0072] The seventh resistor R7 is located between the connection point between the second capacitor C2 and the third capacitor C3 and ground.

[0073] exist Figure 5 In the active filter device 100 shown, the second capacitor C2 and the third capacitor C3 are used for high-pass filtering of the noise signal, filtering out low-frequency noise signals. The fourth resistor R4 and the sixth resistor R6, together with the inverting operational amplifier A1, constitute an inverting proportional amplifier, used for inverting and amplifying the filtered low-frequency noise signal. The amplification factor of the inverting proportional amplifier is determined based on the resistance values ​​of the fourth resistor R4 and the sixth resistor R6. The fifth resistor R5 is used to filter the signal output from the inverting proportional amplifier to obtain the initial compensation signal. The seventh resistor R7 is used to achieve impedance matching with the noise coupling module 110. The fourth capacitor C4 is used to achieve tracking between the input and output signals of the inverting proportional amplifier, stabilizing the output of the inverting proportional amplifier.

[0074] In practical implementation, the compensation output module in an active filter device has various structures to achieve its function; see [reference needed]. Figure 6 As shown, the compensation output module 130 may include: a first filtering submodule 131 and a fifth capacitor C5;

[0075] The input terminal of the first filtering submodule 131 is connected to the output terminal of the signal processing module 120, and the output terminal of the first filtering submodule 131 is connected to the current carrier 140 via the fifth capacitor C5.

[0076] exist Figure 6 In the active filter device 100 shown, the first filter submodule 131 and the fifth capacitor C5 correspond to the case where a frequency selection point is set. The first filter submodule 131 and the fifth capacitor C5 adjust the amplitude of the initial compensation signal at the frequency selection point. The impedance of the first filter submodule 131 and the fifth capacitor C5 is equal to the impedance of the power system connected to the fluid carrier 140, so as to achieve impedance matching between the compensation output module 130 and the power system connected to the fluid carrier 140.

[0077] For details, please refer to Figure 6As shown, the first filter submodule 131 includes an eighth resistor R8, a ninth resistor R9 and a sixth capacitor C6. The eighth resistor R8 and the sixth capacitor C6 are connected in series between the output of the signal processing module 120 and the fifth capacitor C5, and the ninth resistor R9 is connected in parallel with the series connection of the eighth resistor R8 and the sixth capacitor C6.

[0078] In a specific implementation, the compensation output module 130 in the active filter device 100 has various structures to achieve its functions, as described below. Figure 7 As shown, the compensation output module 130 can include a first filter submodule 131, a second filter submodule 132 and a third filter submodule 133; wherein the first filter submodule 131, the second filter submodule 132 and the third filter submodule 133 have different frequency selection points.

[0079] The input of the first filter submodule 131 is connected to the output of the signal processing module 120, the output of the first filter submodule 131 is connected to the current-carrying body 140 via the second filter submodule 132, and the output of the first filter submodule 131 is also connected to the ground via the third filter submodule 133.

[0080] In a specific implementation, the compensation output module 130 in the active filter device 100 has various structures to achieve its functions, as described below. Figure 7 As shown in the active filter device 100, the first filter submodule 131, the second filter submodule 132 and the third filter submodule 133 have different frequency selection points. The total impedance of the first filter submodule 131, the second filter submodule 132 and the third filter submodule 133 is equal to the impedance of the power system connected to the current-carrying body 140, so as to achieve impedance matching between the compensation output module 130 and the power system connected to the current-carrying body 140. In actual application, the initial compensation signal first enters the first filter submodule 131, which performs preliminary frequency selection and amplitude adjustment on the initial compensation signal based on its frequency selection point. Then, the signal is transmitted to the second tuning submodule and the third tuning submodule respectively, the second filter submodule 132 performs further frequency selection and amplitude adjustment on the input signal based on its frequency selection point, the second tuning submodule outputs the processed signal to the current-carrying body 140, and the third filter submodule 133 performs further frequency selection and amplitude adjustment on the input signal based on its frequency selection point, and the third tuning submodule grounds the processed signal. In this way, the compensation output module 130 can accurately select and adjust the amplitude of the initial compensation signal in different frequency bands, obtain the target compensation signal, and perform forward or reverse delivery on the target compensation signal, so as to balance the stability and performance of the active filter device.

[0081] Specifically, as shown in the following table, the first filter submodule 131, the second filter submodule 132 and the third filter submodule 133 have different frequency selection points. Figure 7As shown, the second filter submodule 132 includes a tenth resistor R10, a seventh capacitor C7, and an eighth capacitor C8. The seventh capacitor C7 and the eighth capacitor C8 are connected in series between the output terminal of the first filter submodule 131 and the current carrier 140, and the tenth resistor R10 is connected in parallel with the seventh capacitor C7. The third filter submodule 133 includes an eleventh resistor R11 and a ninth capacitor C9. The eleventh resistor R11 and the ninth capacitor C9 are connected in series between the output terminal of the first filter submodule 131 and ground.

[0082] In one possible implementation, Figure 7 Based on the compensation output module shown, multiple filter sub-modules can be added to expand the frequency selection points. Each added filter sub-module can be connected in series with the first filter sub-module, the second filter sub-module, or the third filter sub-module. The structure of the added filter sub-modules can be the same as the first, second, or third filter sub-modules, or other structures can be used. However, it is necessary to ensure that the frequency selection points of the added filter sub-modules are all different, and that the frequency selection points of the series connections with the first, second, and third filter sub-modules are different. Furthermore, it is also necessary to ensure that the total impedance of the compensation output module after adding multiple filter sub-modules is equal to the impedance of the electrical system connected to the fluid carrier, so as to achieve impedance matching between the compensation output module and the electrical system connected to the fluid carrier 140.

[0083] Based on the same concept, this utility model embodiment also provides a DC power supply device, see reference. Figure 8 As shown, the DC power supply device 200 includes: a DC power conversion device 210 and multiple active filter devices 100 provided in the embodiments of this application;

[0084] The positive input terminal of the DC power converter 210 is connected to the positive output terminal of the external DC power supply, and the negative input terminal of the DC power converter 210 is connected to the negative output terminal of the external DC power supply; the ground terminal of the DC power converter 210 is connected to the external ground wire; the positive output terminal of the DC power converter 210 is connected to the first terminal of the external load, and the negative output terminal of the DC power converter 210 is connected to the second terminal of the external load.

[0085] The active filter 100 is disposed on the input side and / or output side of the DC power conversion device 210.

[0086] exist Figure 8In the shown direct current power supply device 200, two active filter devices 100 can be arranged at the input side of the direct current power conversion device 210. The input end and the output end of one of the active filter devices 100 are connected with the current carrier 140 between the positive input end of the direct current power conversion device 210 and the external direct current power supply, and the input end and the output end of the other active filter device 100 are connected with the current carrier 140 between the negative input end of the direct current power conversion device 210 and the external direct current power supply. The ground end of each active filter device 100 is connected with the external ground wire PE. Two active filter devices 100 can also be arranged at the output side of the direct current power conversion device 210. The input end and the output end of one of the active filter devices 100 are connected with the current carrier 140 between the positive output end of the direct current power conversion device 210 and the external load, and the input end and the output end of the other active filter device 100 are connected with the current carrier 140 between the negative output end of the direct current power conversion device 210 and the external load. The ground end of each active filter device 100 is connected with the external ground wire PE.

[0087] In this way, by arranging the active filter device 100 in the direct current power supply device 200, the active filter device 100 can collect the noise signal on the current carrier 140 in real time without affecting the direct current power supply device 200, and output a target compensation signal which is opposite in phase and equal in amplitude to the noise signal, and directly act on each current carrier 140 in the direct current power supply device 200, so as to accurately and timely eliminate the noise signal at the input side and the output side of the direct current power supply device 200.

[0088] Based on the same concept, the utility model embodiment further provides an alternating current power supply device, referring to Figure 9 The alternating current power supply device 300 comprises an alternating current power conversion device 310 and a plurality of active filter devices 100 provided by the present application.

[0089] The first input end, the second input end and the third input end of the alternating current power conversion device 310 are connected with the corresponding phase lines in the external alternating current power supply respectively, and the ground end of the alternating current power conversion device 310 is connected with the external ground wire; the first output end of the alternating current power conversion device 310 is connected with the first end of the external load, and the second output end of the alternating current power conversion device 310 is connected with the second end of the external load.

[0090] The active filter devices 100 are arranged at the input side and / or the output side of the alternating current power conversion device 310.

[0091] In Figure 9In the illustrated alternating current power supply device 300, the alternating current power conversion device 310 and the external alternating current power source are connected in a three-phase three-wire mode, that is, the external alternating current power source is provided with three phase lines L1, L2 and L3, the first input end of the alternating current power conversion device 310 is connected with the phase line L1, the second input end of the alternating current power conversion device 310 is connected with the phase line L2, and the third input end of the alternating current power conversion device 310 is connected with the phase line L3. In view of the three-phase three-wire connection mode between the alternating current power conversion device 310 and the external alternating current power source, the input side of the alternating current power conversion device 310 can be provided with three active filter devices 100. The input end and the output end of the first active filter device 100 are connected with the current-carrying body between the first input end of the alternating current power conversion device 310 and the external alternating current power source, the input end and the output end of the second active filter device 100 are connected with the current-carrying body between the second input end of the alternating current power conversion device 310 and the external alternating current power source, and the input end and the output end of the third active filter device 100 are connected with the current-carrying body between the third input end of the alternating current power conversion device 310 and the external alternating current power source. The grounding end of each active filter device 100 is connected with the external ground line PE. The output side of the alternating current power conversion device 310 can be provided with two active filter devices 100. The input end and the output end of one of the active filter devices 100 are connected with the current-carrying body between the first output end of the alternating current power conversion device 310 and the first end of the external load, and the input end and the output end of the other active filter device 100 are connected with the current-carrying body between the second output end of the alternating current power conversion device 310 and the second end of the external load. The grounding end of each active filter device 100 is connected with the external ground line PE.

[0092] In this way, by arranging the active filter device 100 in the alternating current power supply device 300 connected in the three-phase three-wire mode, the active filter device 100 can collect the noise signal on the current-carrying body in real time without affecting the alternating current power supply device 300, and output the target compensation signal opposite in phase and equal in amplitude to the noise signal, so as to directly act on each current-carrying body in the alternating current power supply device 300, and realize accurate and timely elimination of the noise signal at the input side and the output side of the alternating current power supply device 300.

[0093] In a possible implementation, referring to Figure 10 As illustrated, the active filter device 100 can also be applied to the alternating current power supply device 300 connected in a three-phase four-wire mode, specifically:

[0094] The fourth input end of the alternating current power conversion device 310 is connected with the zero line of the external alternating current power source.

[0095] In Figure 10In the shown alternating current power supply device 300, the alternating current power conversion device 310 and the external alternating current power source adopt a three-phase four-wire connection mode, that is, the external alternating current power source is provided with one neutral line N and three phase lines L1, L2 and L3. The first input end, the second input end and the third input end of the alternating current power conversion device 310 are connected with the corresponding phase lines in the three phase lines L1, L2 and L3 of the external alternating current power source, and the fourth input end of the alternating current power conversion device 310 is connected with the neutral line N of the external alternating current power source. The three-phase four-wire connection mode between the alternating current power conversion device 310 and the external alternating current power source is different from the three-phase four-wire connection mode provided with the active filter device 100 only in that an active filter device 100 needs to be additionally arranged between the fourth input end of the alternating current power conversion device 310 and the neutral line of the external alternating current power source. Specifically, the input end and the output end of the active filter device 100 are connected with the current-carrying body between the fourth input end of the alternating current power conversion device 310 and the external alternating current power source, and the grounding end of the active filter device 100 is connected with the external grounding line PE.

[0096] In this way, by arranging the active filter device 100 in the alternating current power supply device 300 adopting the three-phase four-wire connection mode, the active filter device 100 can collect the noise signal on the current-carrying body in real time without affecting the alternating current power supply device 300, and output a target compensation signal opposite in phase and equal in amplitude to the noise signal, so as to directly act on each current-carrying body in the alternating current power supply device 300, thereby realizing accurate and timely elimination of the noise signal at the input side and the output side of the alternating current power supply device 300.

[0097] Although the preferred embodiments of the present application have been described, those skilled in the art who have the basic inventive concept can make further changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0098] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. An active filter device, characterized by The application relates to a noise coupling module, a signal processing module and a compensation output module. The noise coupling module, the signal processing module and the compensation output module are connected in series. The noise coupling module is used for collecting noise signals on the current-carrying body. The signal processing module is used for filtering and inverting and amplifying the noise signals to obtain initial compensation signals. The compensation output module is used for performing frequency matching processing on the initial compensation signals to obtain target compensation signals and outputting the target compensation signals to the current-carrying body. The noise coupling module comprises a first capacitor, a first resistor, a second resistor and a first voltage conversion submodule.

2. The active filtering device of claim 1, wherein, The first end of the first capacitor is connected to the current-carrying body, the second end of the first capacitor is connected to the ground through the first resistor, and the second end of the first capacitor is also connected to the first input end of the first voltage conversion submodule through the second resistor. The second input end of the first voltage conversion submodule is connected to the ground, and the output end of the first voltage conversion submodule is connected to the corresponding input end of the signal processing module. The first voltage conversion submodule comprises a voltage transformer.

3. The active filtering device of claim 2, wherein, The first input end of the voltage transformer is connected to the second end of the first capacitor through the second resistor, the second input end of the voltage transformer is connected to the ground, and the output end of the voltage transformer is connected to the corresponding input end of the signal processing module. The first diode and the first input end of the linear optocoupler are both connected to the second end of the first capacitor through the second resistor, and the anode of the first diode and the second input end of the linear optocoupler are both connected to the ground.

4. The active filtering device of claim 2, wherein, The first output end of the linear optocoupler is connected to the first input end of the signal processing module and a power supply through the third resistor, the first output end of the linear optocoupler is also connected to the second input end of the signal processing module, and the second output end of the linear optocoupler is connected to the ground. The signal processing module comprises a second capacitor, a third capacitor, a fourth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an inverting operational amplifier. The inverting input end of the inverting operational amplifier is connected to the first output end of the first voltage conversion submodule through the third capacitor and the second capacitor connected in series.

5. An active filter device as claimed in any one of claims 2-4, characterized in that The forward input end of the inverting operational amplifier is connected to the second output end of the first voltage conversion submodule and the ground through the fourth resistor. The output end of the inverting operational amplifier is connected to the input end of the compensation output module through the fifth resistor, the output end of the inverting operational amplifier is also connected to the inverting input end of the inverting operational amplifier through the sixth resistor, and the output end of the inverting operational amplifier is also connected to the connection point between the second capacitor and the third capacitor through the fourth capacitor. The seventh resistor is arranged between the connection point between the second capacitor and the third capacitor and the ground. ​ ​ 6. The active filtering device of claim 5, wherein, The compensation output module comprises a first filter submodule and a fifth capacitor; The input end of the first filter submodule is connected with the output end of the signal processing module, and the output end of the first filter submodule is connected with the current-carrying body through the fifth capacitor.

7. The active filtering device of claim 5, wherein, The compensation output module comprises a first filter submodule, a second filter submodule and a third filter submodule; wherein the frequency selection points of the first filter submodule, the second filter submodule and the third filter submodule are different. The input end of the first filter submodule is connected with the output end of the signal processing module, and the output end of the first filter submodule is connected with the current-carrying body through the second filter submodule, and the output end of the first filter submodule is also connected with the ground through the third filter submodule.

8. A DC powered device, characterized in that The compensation output module comprises a first filter submodule, a second filter submodule and a third filter submodule; wherein the frequency selection points of the first filter submodule, the second filter submodule and the third filter submodule are different. A direct-current power conversion device and a plurality of active filter devices according to any one of claims 1-7; The positive input end of the direct-current power conversion device is connected with the positive output end of an external direct-current power supply, the negative input end of the direct-current power conversion device is connected with the negative output end of the external direct-current power supply, the ground end of the direct-current power conversion device is connected with an external ground wire, the positive output end of the direct-current power conversion device is connected with the first end of an external load, and the negative output end of the direct-current power conversion device is connected with the second end of the external load; The active filter devices are arranged on the input side and / or the output side of the direct-current power conversion device.

9. An AC powered device, characterized by The compensation output module comprises a first filter submodule, a second filter submodule and a third filter submodule; wherein the frequency selection points of the first filter submodule, the second filter submodule and the third filter submodule are different. An alternating-current power conversion device and a plurality of active filter devices according to any one of claims 1-7; The first input end, the second input end and the third input end of the alternating-current power conversion device are respectively connected with corresponding phase lines of an external alternating-current power supply, the ground end of the alternating-current power conversion device is connected with an external ground wire, the first output end of the alternating-current power conversion device is connected with the first end of an external load, and the second output end of the alternating-current power conversion device is connected with the second end of the external load; The active filter devices are respectively arranged on the input side and / or the output side of the alternating-current power conversion device.

10. The AC power supply device according to claim 9, wherein The fourth input end of the alternating-current power conversion device is connected with the zero line of the external alternating-current power supply.

Images