CN113114382B - Power supply filtering device - Google Patents
Power supply filtering device Download PDFInfo
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- CN113114382B CN113114382B CN202010050841.9A CN202010050841A CN113114382B CN 113114382 B CN113114382 B CN 113114382B CN 202010050841 A CN202010050841 A CN 202010050841A CN 113114382 B CN113114382 B CN 113114382B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/806—Arrangements for feeding power
- H04B10/808—Electrical power feeding of an optical transmission system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The embodiment of the application discloses a power supply filtering device, which comprises: the PCB comprises a first copper foil wire and one or more copper sheets, wherein the first copper foil wire and the one or more copper sheets are coated on the PCB, and the one or more copper sheets are connected with a power pin on the PCB through the first copper foil wire; the one or more copper sheets and the first copper foil wire are used for filtering signals in a target frequency range from power signals of the power pins, the target frequency range can be determined based on the area of each copper sheet in the one or more copper sheets and the length and the width of the first copper foil wire, and the power pins on the PCB are power pins of the BOSA RX and are used for providing power signals for the BOSA RX. By adopting the embodiment of the application, the interference of the 5G WiFi signal to the BOSA power supply signal can be effectively reduced, and the anti-interference capability of the BOSA is improved.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a power supply filtering device.
Background
A passive optical network (passive optical network, PON) system generally includes an optical line terminal (optical line terminal, OLT) device at a local side, an optical network terminal (optical network terminal, ONT) device at a subscriber side, and a passive optical distribution network (optical distribution network, ODU) connecting the two. The ONT devices are typically deployed in the user's home, mainly with an optical interface and a wireless local area network (wireless fidelity, wiFi) interface; the optical interface is used for connecting with an operator local side device (OLT), and the WiFi interface is used for connecting with a user terminal.
Currently, an optical interface on an ONT is in a form of a board (BOB) of an optical device, and a receiving end (RX) of an optical transmit receive assembly (BOSA) in the ONT is directly inserted into a board of an optical network unit (optical network unit, ONU). The RX of the BOSA includes 5 pins, 2 pins for receiving 10G PON signals, 2 pins for receiving power signals, and 1 ground pin, respectively. The WiFi antenna of the ONT has two forms of a rod shape and a patch, as the ONT equipment becomes smaller, the WiFi antenna of the ONU tends to be more in the patch form, and then the distance between the patch WiFi antenna positioned inside the ONT shell and the ONU veneer is reduced. However, the power supply of BOSA (TIA and APD power supplies) is a sensitive source of interference, primarily sensitive to 5G WiFi signals. Therefore, when the WiFi antenna inside the ONT housing externally radiates the WiFi signal at the 5G frequency point, the 5G WiFi signal will cause interference to the power signal of the BOSA, affecting the sensitivity of the BOSA to receive the 10G PON signal.
Disclosure of Invention
The embodiment of the application provides a power supply filtering device which can effectively reduce the interference of a 5G WiFi signal on a BOSA power supply signal and improve the anti-interference capability of the BOSA.
In a first aspect, an embodiment of the present application provides a device for power filtering, the device including a first copper foil wire disposed on a PCB and one or more copper sheets connected to a power pin on the PCB through the first copper foil wire. The power filtering device is used for filtering signals (high-frequency interference signals herein) in a target frequency range from power signals of the power pins, wherein the target frequency range can be determined based on the area of each copper sheet in the one or more copper sheets and the length and the width of the first copper foil line. The first copper foil wire herein includes copper foil wires between each of the one or more copper sheets and a power pin on the PCB. The PCB is an ONU single board, and a power pin on the PCB is a power pin of the BOSA RX and is used for providing a power signal for the BOSA RX. Each copper sheet of the one or more copper sheets exhibits a capacitive characteristic equivalent to a capacitance; the first copper foil wire exhibits an inductive characteristic equivalent to an inductance.
According to the embodiment of the application, the device for power supply filtering is designed on the PCB by utilizing the capacitance characteristic of the copper sheet and the inductance characteristic of the copper foil wire, the interference of the 5G WiFi signal on the BOSA power supply signal is reduced by the filtering characteristic of the device, and the anti-interference capability of the BOSA is improved.
With reference to the first aspect, in one possible implementation manner, the PCB is a multi-layer board, at least including two PCB layers, and the one or more copper sheets may be laid on different PCB layers. Specifically, the one or more copper sheets include one or more first copper sheets and one or more second copper sheets, where the first copper sheets may be located on the same PCB layer as the power pins on the PCB, and the second copper sheets may be located on different PCB layers as the power pins on the PCB, i.e., the first copper sheets and the second copper sheets are located on different PCB layers. The first copper sheet can be connected with the power supply pins on the PCB through copper foil wires, and the second copper sheet can be connected with the power supply pins on the PCB through copper foil wires and metallized through holes. The metallized vias are used to establish a connection between two different PCB layers. The first copper foil wire comprises a copper foil wire between a first copper sheet and a power pin on the PCB, and a copper foil wire between a second copper sheet and the power pin on the PCB.
According to the embodiment of the application, the copper sheets are laid on different PCB layers in a space folding mode and are connected through the drill holes, so that the size of the power supply filtering device can be reduced.
With reference to the first aspect, in a possible implementation manner, the one or more copper sheets may be applied to a same PCB layer of the PCB. The minimum frequency in the target frequency range is determined based on the inductance value of the first copper foil line, and the maximum frequency is determined based on the smallest capacitance value among the capacitance values of the respective copper sheets. The inductance value of the first copper foil wire is determined based on the length and width of the first copper foil wire, and the capacitance value of the copper sheet is determined based on the area of the copper sheet, the dielectric permittivity of the PCB, and the distance between the laid layer of the copper sheet and the adjacent PCB layer.
With reference to the first aspect, in a possible implementation manner, the one or more copper sheets may be applied to a same PCB layer of the PCB. The minimum frequency in the target frequency range is determined based on the inductance value of the first copper foil line, and the maximum frequency is determined based on the smallest capacitance value among the capacitance values of the respective copper sheets. The inductance value of the first copper foil wire is determined based on the length and width of the first copper foil wire, and the capacitance value of the copper sheet is determined based on the area of the copper sheet, the dielectric permittivity of the PCB, and the distance between the laid layer of the copper sheet and the adjacent PCB layer on which another copper sheet of the one or more copper sheets is laid.
With reference to the first aspect, in one possible implementation manner, the capacitance value of each copper sheet is 0.1 to 100pF, and the inductance value of the first copper foil line is 0.1 to 10nH.
With reference to the first aspect, in one possible implementation manner, the target frequency ranges from 3GHz to 10GHz.
In a second aspect, an embodiment of the present application provides an electronic device, including an apparatus in any one of possible implementation manners of the first aspect.
By implementing the embodiment of the application, the interference of the 5G WiFi signal to the BOSA power supply signal can be effectively reduced, and the anti-interference capability of the BOSA is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of an apparatus for filtering a conventional power supply according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an equivalent circuit of a power filtering apparatus according to an embodiment of the present application;
FIG. 3 is a diagram of simulation results of a power filtering apparatus according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a power filtering apparatus according to an embodiment of the present application;
FIG. 5 is another schematic diagram of a power filtering apparatus according to an embodiment of the present application;
FIG. 6 is a schematic diagram of another power filtering apparatus according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.
In the embodiment of the application, the filter is a frequency selecting device, which can make specific frequency components in the signal pass through and greatly attenuate other frequency components. That is, the signals useful to the present apparatus are passed with as little loss as possible, and the signals not useful to the present apparatus are filtered out as much as possible. In other words, the filter (filter) can effectively filter the frequency point of the specific frequency or the frequency outside the frequency point to obtain a power signal of the specific frequency or eliminate the power signal after the specific frequency. The frequency band of the signal passing through the filter is divided into four types of low-pass, high-pass, band-pass and band-stop filters. The low pass filter allows low frequency or direct current components in the signal to pass through and suppresses high frequency components or interference or noise. The high pass filter allows high frequency components in the signal to pass through and suppresses low frequency or direct current components. The band pass filter allows a signal of a certain frequency band to pass, and suppresses a signal, interference or noise below or above the frequency band. The band reject filter rejects signals in a frequency band and allows signals outside the frequency band to pass.
Referring to fig. 1, fig. 1 is a schematic diagram of an apparatus for filtering an existing power supply according to an embodiment of the present application. As shown in fig. 1, the BOSA RX part adopts a direct-insertion ONU board scheme, and a power PIN (or a power PIN) of the BOSA RX part is directly soldered to a printed circuit board (printed circuit board, PCB), and appropriate magnetic beads LB and a capacitor C are arranged on the BOSA RX power PIN of the PCB, so as to form a low-pass filter for filtering out 5G frequency point signals on the BOSA RX power PIN. However, in the scheme of forming the low-pass filter by the magnetic beads LB and the capacitor C, the frequency of the 5G frequency point signal is relatively high, the required filter capacitance value is relatively small (picofarpf level), the capacitance radius of the pF level is limited, and the filter capacitor is required to be arranged near the power supply pin of the BOSA RX. Because the wave soldering temperature on the PCB is high, surrounding veneers which are subjected to wave soldering on the PCB deform, and components are not easy to arrange, a forbidden coverage area is required to be arranged during wave soldering, and therefore the magnetic beads LB and the capacitor C are required to be arranged outside the forbidden coverage area (for example, 5 mm) of the BOSA RX power supply pin. Therefore, the low-pass filter formed by the magnetic beads LB and the capacitor C has a limited ability to filter high-frequency point signals.
In some possible embodiments, the BOSA RX part may also be welded with the ONU veneer manually using a flexible board. Because the forbidden area of manual welding mode is little, so can arrange magnetic bead and electric capacity near BOSA RX power supply pin on the flexible board to form the low pass filter, be used for filtering the 5G frequency point signal on the BOSA RX power supply pin. But the use of the flexible board to connect the BOSA and ONU veneers increases the material cost and the chip processing cost of the magnetic beads and capacitors.
The application provides a power supply filtering device for solving the problem that the filtering effect and the cost on a BOSA RX power supply pin are incompatible, which can effectively reduce the interference of a 5G WiFi signal on a BOSA power supply signal and improve the anti-interference capability of the BOSA while reducing the cost.
Since BOSA RX has 2 pins to receive power signals, BOSA RX has 2 power signals. For ease of description, filtering is performed below for any one of the power supply signals in BOSA RX. Optionally, the power filtering device provided by the application can be applicable to any power signal in the BOSA RX, and can also be applicable to two power signals in the BOSA RX.
Referring to fig. 2, fig. 2 is an equivalent circuit schematic diagram of a power filtering apparatus according to an embodiment of the present application. As shown in fig. 2, the equivalent circuit comprises 2 capacitors C1 and C2,1 inductor L,1 resistor R. One end of the capacitor C1 is connected with one end of the inductor L, and the other end of the capacitor C is grounded. The other end of the inductor L is connected with one end of the resistor R. The other end of the resistor R is connected with one end of the capacitor C2 and a power pin of the BOSA RX. The other end of the capacitor C2 is grounded. Because the capacitor has the function of passing high frequency and low frequency, and the inductor has the function of passing low frequency and high frequency, the equivalent circuit can form a power supply filtering device for inhibiting the signal in a section of frequency in the power supply signal of the BOSA RX power supply pin from passing. In the equivalent circuit, after the power signal input by the power supply is filtered through the capacitor C1, the inductor L, the resistor R and the capacitor C2, a purer power signal can be obtained and input into the power pin of the BOSA RX, and the purer power signal is provided for the BOSA, so that the interference of the 5G WiFi signal on the BOSA power signal is reduced.
Because the operating frequency range of the 5G WiFi signal is 5.15 GHz-5.85 GHz, the equivalent circuit can inhibit the signal passing through in the frequency range of 5.15 GHz-5.85 GHz. In practical applications, the frequency range of the equivalent circuit suppression signal may include the operating frequency range of the 5G WiFi signal, for example, the frequency range of the equivalent circuit suppression signal is 3GHz to 10GHz. Optionally, the frequency range of the equivalent circuit suppression signal can be flexibly adjusted according to the capacitance value and the inductance value. It will be appreciated that fig. 2 shows only 2 capacitors by way of example, and that in practical applications the equivalent circuit may comprise 1 capacitor. It will also be appreciated that the series connection of resistor R with inductor L in fig. 2 prevents the short circuit of inductor L from burning out.
According to the embodiment of the application, the band-stop filter is formed by connecting the capacitor and the inductor in parallel to inhibit the signal passing in one section of frequency, so that the 5G frequency point signal in the power supply signal input into the BOSA is inhibited, the interference of the 5G WiFi signal on the BOSA power supply signal is reduced, and the anti-interference capability of the BOSA is improved.
In some possible embodiments, for high frequency signals, the copper foil wire, copper foil, and drilled holes applied to the PCB all have capacitive and inductive properties. The dimensions (e.g., length and width) of the copper foil wire determine the inductive or capacitive properties of the copper foil wire, as well as the dimensions (e.g., area) of the copper sheet. Since the copper foil wire has resistance, the copper foil wire also has resistance effect. The PCB in the embodiment of the application is a multi-layer board, namely, a plurality of circuit board layers are arranged on the PCB. On a rigid PCB, there is a dielectric layer between the stacks of multiple circuit board layers. A commonly used dielectric layer material is FR4 material. The dielectric constant of the dielectric layer on the PCB is typically 4.4±10%.
According to the embodiment of the application, the device for power supply filtering is designed on the PCB by utilizing the capacitance characteristic of the copper sheet and the inductance characteristic of the copper foil wire, and the interference of the 5G WiFi signal on the BOSA power supply signal is reduced by the filtering characteristic of the device. Specifically, the device for power supply filtering in the embodiment of the application comprises a first copper foil wire and one or more copper sheets, wherein the first copper foil wire is arranged on a PCB, and the one or more copper sheets are connected with a power supply pin on the PCB through the first copper foil wire. The power filtering device is used for filtering signals (high-frequency interference signals herein) in a target frequency range from the power signals of the power pins, wherein the target frequency range can be determined based on the area of each copper sheet in the one or more copper sheets and the length and the width of the first copper foil wire. The first copper foil wire herein includes copper foil wires between each of the one or more copper sheets and a power pin on the PCB. The PCB is an ONU single board, and a power pin on the PCB is a power pin of the BOSA RX and is used for providing a power signal for the BOSA. Each copper sheet of the one or more copper sheets exhibits a capacitive characteristic equivalent to a capacitance; the first copper foil wire exhibits an inductance characteristic equivalent to an inductance; because the first copper foil wire also has a resistive effect, the first copper foil wire may also be equivalent to a resistor.
In some possible embodiments, adjusting the area of the copper sheet is equivalent to adjusting the equivalent capacitance value of the copper sheet, which satisfies equation (1-1):
C＝ε*S/D， (1-1)
wherein, C in the formula (1-1) represents the equivalent capacitance value of the copper sheet, epsilon represents the dielectric constant of the dielectric layer of the PCB, and S is the area of the copper sheet.
Alternatively, if one or more copper sheets are applied to the same PCB layer (or the same wiring board layer) of the PCB, D represents the distance between the applied layer of copper sheets and its adjacent PCB layer. For example, a total of 4 layers of the PCB, D represents the distance between the first and second layers of the PCB, assuming that the copper sheets are all applied to the first layer of the PCB. If one or more copper sheets are applied to different PCB layers (or different circuit board layers) of the PCB, D may be: (1) If the laying layer of the copper sheet a in the one or more copper sheets has an adjacent PCB layer, D represents the distance between the laying layer of the copper sheet a and the adjacent PCB layer on which another copper sheet in the one or more copper sheets is laid when calculating the equivalent capacitance value of the copper sheet a. For example, if the PCB has 4 layers, and if one or more copper sheets are laid on the first layer, the third layer and the fourth layer of the PCB, D represents the distance between the first layer and the third layer of the PCB when calculating the equivalent capacitance value of the copper sheet a on the first layer of the PCB. (2) If the laying layer of the copper sheet b in the one or more copper sheets has two adjacent PCB layers, D is (D ij +D jk )/(D ij *D jk ). Wherein D is ij Represents the distance between the ith and jth layers of the PCB, D jk Representing the first of the PCBDistance between layer j and layer k. The ith layer and the kth layer of the PCB are both laid with copper sheets, and the ith layer and the kth layer are adjacent PCB layers of the jth layer. For example, assuming that one or more copper sheets are disposed on the first layer, the third layer, and the fourth layer of the PCB, when calculating the equivalent capacitance value of the copper sheet b on the third layer of the PCB, the first layer and the fourth layer are adjacent PCB layers of the third layer, and the value of D is (D 13 +D 34 )/(D 13 *D 34 )。
In other possible embodiments, adjusting the length and width of the copper foil wire is equivalent to adjusting the equivalent inductance value of the copper foil wire, which satisfies the formula (1-2):
L＝2*l*(In(21/W)+0.5+0.2235*W/l)， (1-2)
wherein L in the formula (1-2) represents the equivalent inductance value of the copper foil wire, L represents the length of the copper foil wire, and W represents the width of the copper foil wire. In (x) represents the logarithm based on e
In still other possible embodiments, adjusting the length and width of the copper foil line is also equivalent to adjusting the equivalent resistance value of the copper foil line, which satisfies the equation (1-3):
R＝ρl/s， (1-3)
wherein R in the formula (1-3) represents the equivalent resistance value of the copper foil wire, ρ represents the electrical conductivity of the wire (the wire here means the copper foil wire), l represents the length of the copper foil wire, and s represents the cross-sectional area of the copper foil wire.
Since the equivalent capacitance value of the copper sheet satisfies the formula (1-1) and the equivalent inductance value of the copper foil wire satisfies the formula (1-2), a proper equivalent capacitance value can be obtained by adjusting the area of the copper sheet, and a proper equivalent inductance value can be obtained by adjusting the length and width of the copper foil wire, so that the frequency range (namely the target frequency range) of the signal filtered from the power signal of the power pin by the power filtering device is determined through the equivalent capacitance value and the equivalent inductance value.
It is understood that the minimum frequency in the target frequency range is determined based on the inductance value of the first copper foil wire, and the maximum frequency is determined based on the minimum capacitance value of the capacitance values of the respective copper sheets. In practical applications, the minimum frequency and the maximum frequency in the target frequency range may be determined based on simulation results. As shown in fig. 3, fig. 3 is a diagram of simulation results of a power filtering apparatus according to an embodiment of the present application. As shown in fig. 3, the abscissa of fig. 3 represents frequency and the ordinate represents attenuation on the BOSA RX power pin. Assuming that the two power pins of the BOSA RX are both provided with a power filtering device, the dielectric constant epsilon of the PCB is 4.4, the power filtering device includes 2 copper sheets, the area of the copper sheet 1 is 2.5mm by 2.5mm, and the area of the copper sheet 2 is 5mm by 5mm. Fig. 3 shows the attenuation on two power pins (power pin 1 and power pin 2) of the BOSA RX, respectively, and as can be seen from fig. 3, the power filtering device can achieve-20 dB (decibel) attenuation in the range of 3GHz to 10GHz.
In some possible embodiments, in order to filter out the 5G frequency point signal from the power signal of the power pin, the equivalent capacitance value of each copper sheet is 0.1 to 100pF, and the inductance value of the first copper foil wire is 0.1 to 100nH (nano henry). The target frequency range may include 5.15GHz to 5.85GHz of the operating frequency range of the 5G WiFi signal, and the target frequency range may be 3GHz to 10GHz.
In an alternative embodiment, referring to fig. 4, fig. 4 is a schematic structural diagram of an apparatus for filtering power provided by an embodiment of the present application. As shown in fig. 4, the power filtering device includes n copper sheets 1, 2 and …, n copper sheets, which are applied on the PCB, and the n copper sheets are connected with power pins on the PCB through copper foil wires, which is equivalent to a band-stop filter. The n copper sheets and copper foil wires are applied to the same PCB layer (or the same circuit board layer) of the PCB. The power supply pin on the PCB is a power supply pin of the BOSA RX and is used for providing a power supply signal for the BOSA. The power signal input by the power supply is filtered by the copper foil wires and n copper sheets to obtain purer power signal which is input into the power pin of the BOSA RX, so that the interference of the 5G frequency point signal to the BOSA power signal is reduced. It will be appreciated that fig. 4 illustrates the positional relationship and shape of the copper sheet, the copper foil wire, and the power pins by way of example only, and in practical application, the shape of the copper sheet applied to the PCB may be any shape, not limited to rectangular; the copper sheets laid on the PCB can be in the same orientation (the copper sheets are laid on the upper half board of the PCB as shown in FIG. 4) or in different orientations (the copper sheets are laid on the upper half board and the lower half board of the PCB).
In another alternative embodiment, the copper sheets applied to the PCB may be oriented differently, and fig. 5 is another schematic structure of the power filtering apparatus according to the embodiment of the present application. As shown in fig. 5, the power filtering device includes a copper sheet 1, a copper sheet 2 and a first copper foil wire, wherein the copper sheet 1 is connected with a power pin on the PCB through the copper foil wire, the copper sheet 2 is also connected with the power pin on the PCB through the copper foil wire, and the first copper foil wire includes a copper foil wire between the copper sheet 1 and the power pin and a copper foil wire between the copper sheet 2 and the power pin. Copper sheet 1, copper sheet 2 and first copper foil line lay in the same PCB layer (same circuit board layer) of PCB, and copper sheet 1, copper sheet 2 and the power pin on the PCB are in same PCB layer. The copper sheet 1 is equivalent to a first capacitor, the copper sheet 2 is equivalent to a second capacitor, the first copper foil wire is equivalent to an inductor, and a circuit of the band-stop filter is formed among the first capacitor, the second capacitor and the inductor. The capacitance value of the first capacitor (i.e., the equivalent capacitance of the copper sheet 1) may be determined based on the area of the copper sheet 1, the dielectric constant between the layer in which the copper sheet 1 is disposed and the next layer (i.e., the dielectric constant of the dielectric layer in fig. 5), and the distance between the layer in which the copper sheet 1 is disposed and the adjacent PCB layer (i.e., the adjacent layer (ground) in fig. 5). The capacitance value of the second capacitor (i.e., the equivalent capacitance of the copper sheet 2) may be determined based on the area of the copper sheet 2, the dielectric constant between the layer in which the copper sheet 2 is disposed and the next layer (i.e., the dielectric constant of the dielectric layer in fig. 5), and the distance between the layer in which the copper sheet 2 is disposed and the adjacent PCB layer (i.e., the adjacent layer (ground) in fig. 5). The inductance value of the inductance (i.e., the equivalent inductance of the first copper foil line) may be determined based on the length and width of the first copper foil line. Optionally, the PCB is an ONU board, and a power pin on the PCB is a power pin of the BOSA RX, for providing a power signal to the BOSA. The power signal of power input passes through the first copper foil wire, the copper sheet 1 and the copper sheet 2 and filters signals in a certain frequency to obtain purer power signals which are input into the power pins of the BOSA RX, so that the interference of 5G WiFi signals on the BOSA power signals is reduced, and the anti-interference capability of the BOSA is improved. It is understood that the shapes of the copper sheets 1 and 2 may be any shape.
According to the embodiment of the application, the copper sheet and the copper foil wire are laid on the PCB, so that the cost is not increased, the cost is reduced, the manufacturing process is shortened, the interference of the 5G WiFi signal on the BOSA power supply signal is reduced by utilizing the capacitance characteristic of the copper sheet and the inductance characteristic of the copper foil wire, and the anti-interference capability of the BOSA is improved.
In yet another alternative embodiment, a plurality of copper sheets may be laid on different PCB layers, see fig. 6, and fig. 6 is a schematic diagram of still another structure of the apparatus for filtering power provided by the embodiment of the present application. As shown in fig. 6, the power filtering device includes a copper sheet 1, a copper sheet 2 and a first copper foil wire, which are disposed on a PCB, wherein the copper sheet 1 and a power pin on the PCB are located on the same PCB layer, and the copper sheet 2 and the power pin on the PCB are located on different PCB layers, i.e. the copper sheet 1 and the copper sheet 2 are located on different PCB layers. The copper sheet 1 is connected with a power pin on the PCB through a copper foil wire, and the copper sheet 2 is connected with the power pin on the PCB through a copper foil wire and a metallized via hole. The metallized vias are used to establish a connection between two different PCB layers. The first copper foil line includes a copper foil line between the copper sheet 1 and a power supply pin on the PCB, and a copper foil line between the copper sheet 2 and a power supply pin on the PCB. The copper sheets 1 and 2 show capacitance characteristics equivalent to capacitance; the first copper foil wire exhibits an inductive characteristic equivalent to an inductance. Optionally, the PCB is an ONU board, and a power pin on the PCB is a power pin of the BOSA RX, for providing a power signal to the BOSA. The power signal of power input passes through this first copper foil line, metallization via hole, copper sheet 1 and copper sheet 2 filtering signal in the certain frequency, obtains purer power signal input BOSA RX's power pin to realize reducing 5G wiFi signal to BOSA power signal's interference, promote BOSA's interference killing feature. It is understood that the shapes of the copper sheets 1 and 2 may be any shape.
In some possible embodiments, copper sheet 1 and copper sheet 2 may be located in opposite positions of different PCB layers, i.e. where copper sheet 1 and copper sheet 2 are vertically mapped onto the same PCB layer overlap.
According to the embodiment of the application, the copper sheets are laid on different PCB layers in a space folding mode and are connected through the drill holes, so that the size of the power supply filtering device can be reduced.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 7, the electronic device 100 includes a power filtering apparatus according to an embodiment of the present application, where the power filtering apparatus includes a first copper foil wire and one or more copper sheets disposed on a PCB, and the one or more copper sheets are connected to a power pin on the PCB through the first copper foil wire. The one or more copper sheets exhibit capacitive characteristics equivalent to capacitance; the first copper foil wire exhibits an inductive characteristic equivalent to an inductance. The device is used for filtering signals (high-frequency interference signals are referred to herein) in a target frequency range from the power signals of the power pins, wherein the target frequency range can be determined based on the area of each copper sheet in the one or more copper sheets and the length and the width of the first copper foil wire. The first copper foil wire herein includes copper foil wires between each of the one or more copper sheets and a power pin on the PCB. The PCB is an ONU single board, and a power pin on the PCB is a power pin of the BOSA RX and is used for providing a power signal for the BOSA RX.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A device for power filtering comprising a first copper foil wire and one or more copper sheets laid on a printed circuit board PCB, wherein:
the one or more copper sheets are connected with the power supply pins on the PCB through the first copper foil wires, the PCB comprises at least two PCB layers, the one or more copper sheets comprise one or more first copper sheets and one or more second copper sheets, the first copper sheets and the power supply pins on the PCB are positioned on the same PCB layer, the second copper sheets and the power supply pins on the PCB are positioned on different PCB layers, and the second copper sheets and the power supply pins are connected through copper foil wires and metallized through holes; the first copper foil wire comprises a copper foil wire between the first copper sheet and a power pin on the PCB, and a copper foil wire between the second copper sheet and the power pin on the PCB;
the one or more copper sheets and the first copper foil wire are used for filtering signals in a target frequency range from power signals of the power pins, and the target frequency range is determined based on the area of each copper sheet in the one or more copper sheets and the width and the length of the first copper foil wire.
2. The apparatus of claim 1, wherein a minimum frequency in the target frequency range is determined based on an inductance value of the first copper foil line and a maximum frequency is determined based on a minimum capacitance value of the capacitance values of the respective copper sheets;
the inductance value of the first copper foil wire is determined based on the width and the length of the first copper foil wire, and the capacitance value of the copper sheet is determined based on the area of the copper sheet, the dielectric permittivity of the PCB, and the distance between the laying layer of the copper sheet and the adjacent PCB layer on which another copper sheet of the one or more copper sheets is laid.
3. The device of claim 2, wherein the capacitance value of each copper sheet is 0.1 to 100pF and the inductance value of the first copper foil wire is 0.1 to 10nH.
4. A device according to any one of claims 1-3, wherein the PCB is an ONU single board, and the power pins on the PCB are power pins of a BOSA of the optical transmitting and receiving assembly.
5. The apparatus of any one of claims 1-4, wherein the target frequency range is 3GHz to 10GHz.
6. An electronic device comprising an apparatus as claimed in any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010050841.9A CN113114382B (en) | 2020-01-13 | 2020-01-13 | Power supply filtering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010050841.9A CN113114382B (en) | 2020-01-13 | 2020-01-13 | Power supply filtering device |
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| CN113114382A CN113114382A (en) | 2021-07-13 |
| CN113114382B true CN113114382B (en) | 2023-09-01 |
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| CN202010050841.9A Active CN113114382B (en) | 2020-01-13 | 2020-01-13 | Power supply filtering device |
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| CN113114382A (en) | 2021-07-13 |
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