CN110391727A - A kind of DC power supply filtering method and circuit for GJB-151A - Google Patents
A kind of DC power supply filtering method and circuit for GJB-151A Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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Abstract
The invention discloses a kind of DC power supply filtering methods and circuit for GJB-151A in power filter field.Power supply signal successively passes through first order High frequency filter, second level common mode low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter, and before first order High frequency filter, pass through genotron, realize the counnter attack connection function of power-supply filter, frequency electing and passing has been carried out respectively before first order High frequency filter, second level common mode low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter, realizes the selection of the filtering frequency range of the DC wave filter.A kind of DC power supply filter circuit for GJB-151A is also disclosed simultaneously.Have the characteristics that circuit is simple, one-way conduction, prevent equipment end Conduction Interference, is applied widely, especially suitable for the application having higher requirements to power supply beta radiation, such as GJB151A-CE102 correlation EMC Requirements.
Description
Technical field
The present invention relates to power filter field, in particular to a kind of DC power supply filtering method and electricity for GJB-151A
Road.
Background technique
In the prior art, common power filter is mainly the group of a conjugation inductance and ordinary inductor and various capacitors
It closes, for the different combination of different frequency usages, power supply disturbance is blocked, common electric source filter circuit such as Fig. 2 institute
Show, DC wave filter terminates at power supply on socket P1, and 1 foot connects just, 2 feet connect it is negative, power supply by C3, L2 and C1, C6,
After the common-mode interference suppression circuit of EC1 composition, using the DM EMI suppression circuit that L1, L3, C2, C5, C7 are formed, finally supply
It is used to load.
But there are some problems for the electric source filter circuit, and such as: existing power-supply filter only considers the work of this circuit
Make frequency range demand, and does not consider that this circuit interferes other equipment bring, and must not effectively take precautions against power input and rectify
Cathode burns out circuit, and these problems cause power circuit and are not able to satisfy GJB-151A " military equipment and subsystem Electromagnetic Launching
With susceptibility requirement " in provide accordingly.
In addition, it has been determined that the frequency range filtered accordingly is fixed, there are nothings due to filter inductance value in electric source filter circuit
Method flexible setting filters the problem of frequency range.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency in the presence of the prior art, provide a kind of for GJB-151A's
DC power supply filtering method and circuit.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of DC power supply filtering method for GJB-151A, power supply signal successively pass through first order High frequency filter, the second level
Common mode low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter, first order High frequency filter it
Before, realize that the input of power filter reversely accesses protection by genotron, and total in first order High frequency filter, the second level
Frequency choosing has been carried out before mould low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter respectively
Logical, frequency electing and passing realizes the selection of the filtering frequency range of DC wave filter.
Preferably, the filter cutoff frequency of second level common mode low-pass filtering can be respectively set are as follows: 10.7kHz,
3.4kHz, 1.1kHz or 200Hz.
Preferably, the filter cutoff frequency of fourth stage difference LC second-order low-pass filter can be respectively set are as follows:
1591.5 kHz, 503.3kHz or 159.2kHz.
A kind of DC power supply filter circuit for GJB-151A, including input capacitance EC1, capacitor C6, high-voltage rectifying two
Pole pipe, high-frequency strobe filter, first order common mode low-pass filter, second level common mode low-pass filter and difference LC step low-pass
Filter,
Input capacitance EC1 and capacitor C6 are parallel to input port A and input port B respectively, the filtering for power supply signal；
The anode of kenotron is connect with input port A, the cathode and high-frequency strobe filter of kenotron
Input terminal connection, when input port A connection input power cathode, when input port B connection input power cathode, high-voltage rectifying
Diode is not turned on；
The input terminal of high-frequency strobe filter and the output end of kenotron connect, the output end of high-frequency strobe filter
It is connect with an input terminal of first order common mode low-pass filter, when high-frequency strobe filter is in strobe state, for filtering
Except the high fdrequency component in input power signal；
One input terminal of first order common mode low-pass filter is connect with the output end of high-frequency strobe filter, another input terminal
Connect with input port B, two output ends of first order common mode low-pass filter respectively with second level common mode low-pass filter
Two input terminal connections, first order common mode low-pass filter filter frequency range for realizing four kinds of first order common mode low-pass filter
Selection；
Two input terminals of second level common mode low-pass filter connect with two output ends of first order common mode low-pass filter respectively
It connecing, the output end of second level common mode low-pass filter is connect with two input terminals of difference LC second-order low-pass filter respectively, when
When second level common mode low-pass filter is in strobe state, for filtering out preset lowpass frequency signal；
Two input terminals of difference LC second-order low-pass filter are connect with two output ends of second level common mode low-pass filter respectively,
Two output ends of difference LC second-order low-pass filter are that a kind of power supply of DC power supply filter circuit for GJB-151A is believed
Number output, the output end of one of difference LC second-order low-pass filter connect direct-current working volts, another difference LC second order
The output end of low-pass filter is grounded.
Preferably, first order common mode low-pass filter includes: to be conjugated inductance L1, L2, L6, L10, capacitor C1, C3,
C4, C5, C8 and gate,
There are two input terminal and four groups of output ends, first group of two output ends to input respectively with two of conjugation inductance L1 for gate
End connection, second group of two output end are connect with two input terminals of conjugation inductance L2 respectively, two output end difference of third group
It is connect with two input terminals of conjugation inductance L6, two input terminals of the 4th group of two output ends respectively with conjugation inductance L10 connect
Connect, gate further includes four groups of switchings switch, one group be closed in four groups of switchings switches, so that it may will conjugation inductance L1, L2, L6,
A conjugation inductance in L10 accesses circuit；
First group of two output end of two input terminals and gate that are conjugated inductance L1 connects, and two of conjugation inductance L1 are defeated
An output end in outlet is grounded by capacitor C1, and another output is grounded by capacitor C8, and two of conjugation inductance L1
Output end is also in parallel with capacitor C3, C4, C5 respectively；
Second group of two output end of two input terminals and gate that are conjugated inductance L2 connects, two outputs of conjugation inductance L2
An output end in end is grounded by capacitor C1, and another output is grounded by capacitor C8, and two of conjugation inductance L2 are defeated
Outlet is also in parallel with capacitor C3, C4, C5 respectively；
Two output ends of third group of two input terminals and gate that are conjugated inductance L6 connect, two outputs of conjugation inductance L6
An output end in end is grounded by capacitor C1, and another output is grounded by capacitor C8, and two of conjugation inductance L6 are defeated
Outlet is also in parallel with capacitor C3, C4, C5 respectively；
4th group of two output end of two input terminals and gate that are conjugated inductance L10 connects, and two of conjugation inductance L10 are defeated
An output end in outlet is grounded by capacitor C1, and another output is grounded by capacitor C8, and the two of conjugation inductance L10
A output end is also in parallel with capacitor C3, C4, C5 respectively.
Preferably, when being conjugated inductance L1 gating, the filter cutoff frequency of second level common mode low-pass filtering is
10.7kHz；
When being conjugated inductance L2 gating, the filter cutoff frequency of second level common mode low-pass filtering is 3.4kHz；
When being conjugated inductance L6 gating, the filter cutoff frequency of second level common mode low-pass filtering is 1.1kHz；
When being conjugated inductance L10 gating, the filter cutoff frequency of second level common mode low-pass filtering is 200Hz.
Preferably, difference LC second-order low-pass filter includes inductance L3, L4, L5, L8, L9 and L11, switch S4,
S6, S10, S14, S16 and S17 and capacitor C2, C7, C9,
Wherein, switch S4 and the inductance L3 first branch in series；Switch S6 and inductance L4 second branch in series；Switch
S10 and inductance L5 third branch in series；Switch S14 and inductance L8 the 4th branch in series；Switch S16 and inductance L9 goes here and there
Connection constitutes the 5th branch；Switch S17 and inductance L11 the 6th branch in series；
After the first branch, second branch and third branch circuit parallel connection, connect access differential LC second-order low-pass filter input terminal C and
Output end E；
After 4th branch, the 5th branch and the 6th branch circuit parallel connection, connect access differential LC second-order low-pass filter input terminal D and
Output end F；
The both ends capacitor C9 are connect with output end E and output end F respectively；
One end of capacitor C2 is connect with input terminal C, other end ground connection；
One end of capacitor C7 is connect with input terminal D, other end ground connection.
Preferably, the operating mode of difference LC second-order low-pass filter includes:
The first mode: switch S4, S6, S10, S14 closure, switch S16 and S17 are disconnected, and corresponding inductance L3, L4, L5 are in parallel
The input terminal C and output end E of access differential LC second-order low-pass filter, close the switch, inductance L8 access differential LC step low-pass
The input terminal D and output end F of filter；
Second of mode: switch S4 and S17 are disconnected, switch S6, S10, S14, S16 closure, corresponding inductance L4, L5 parallel connection access
The input terminal C and output end E of difference LC second-order low-pass filter, inductance L8, L9 parallel connection access differential LC second-order low-pass filter
Input terminal D and output end F；
The third mode: switch S4 and S6 are disconnected, switch S10, S14, S16, S17 closure, and corresponding inductance L5 parallel connection access is poor
Divide the input terminal C and output end E of LC second-order low-pass filter, inductance L8, L9, L11 parallel connection access differential LC second-order low-pass filter
The input terminal D and output end F of device.
Preferably, under the first mode, the filter cutoff frequency of fourth stage difference LC second-order low-pass filter is
1591.5 kHz ；
Under second of mode, the filter cutoff frequency of fourth stage difference LC second-order low-pass filter is 503.3kHz；
Under the third mode, the filter cutoff frequency of fourth stage difference LC second-order low-pass filter is 159.2kHz.
Scheme further include power module, power supply unit, in power-supply system comprising any of the above-described one kind for GJB-151A
DC power supply filter circuit.
Compared with prior art, beneficial effects of the present invention:
The present invention is integrated with a genotron and one group of settable filtering frequency in traditional DC wave filter circuit
Section switch, constitute it is anti-reverse, can scene adjust, prevent load end energy regenerative to the circuit of power supply line.It is simple with circuit, single
To being connected, prevent equipment end Conduction Interference, feature applied widely.Especially suitable for what is had higher requirements to power supply beta radiation
Application such as GJB151A-CE102 correlation EMC Requirements, and can save a large amount of printed circuit board space,
Reduce current drain.
Detailed description of the invention
Fig. 1 is the DC power supply filter circuit block diagram that embodiment 1 is directed to GJB-151A；
Fig. 2 is DC power supply filter circuit schematic diagram in the prior art；
Fig. 3 is the DC power supply filter circuit schematic diagram that embodiment 1 is directed to GJB-151A；
Fig. 4 is gain versus frequency simulation comparison figure in embodiment 1 under four filter cutoff frequencies of first order common mode low-pass filter；
Fig. 5 is gain versus frequency simulation comparison figure in embodiment 1 under the common mode low pass filter cutoff frequency 11.3kHz of the second level；
Fig. 6 is gain versus frequency simulation comparison figure in embodiment 1 under three operating modes of difference LC second-order low-pass filter.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Embodiment 1
A kind of DC power supply filtering method for GJB-151A, power supply signal successively pass through first order High frequency filter,
Second level common mode low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter are output to load,
Before level-one High frequency filter, in the input terminal series connection access genotron of power supply signal, in general, using high pressure
Diode realizes the counnter attack connection function of power-supply filter, and in second level common mode low-pass filtering and fourth stage difference LC bis-
When rank low-pass filtering, filter inductance parameter is selected, so that the cutoff frequency of second level common mode low-pass filtering can be distinguished
Setting are as follows: the cutoff frequency of 10.7kHz, 3.4kHz, 1.1kHz or 200Hz, fourth stage difference LC second-order low-pass filter can be distinguished
Setting are as follows: 1591.5 kHz, 503.3kHz, 159.2kHz.Meets the needs of distinct device filters DC power supply.
Furthermore it is possible to choose whether to carry out first order High frequency filter to power supply signal, when selecting no, not to power supply
Power supply signal carries out first order High frequency filter, and when selection is, filtering performance is 100M-120 ohm, i.e. 100M frequency is equivalent
120 ohmages.It can choose whether to carry out third level common mode low-pass filtering to power supply signal, it is not right when selecting no
Power supply signal carries out third level common mode low-pass filtering, and when selection is, the cutoff frequency of third level common mode low-pass filtering can
Setting are as follows: 11.3kHz.
A kind of DC power supply filter circuit block diagram for GJB-151A is as shown in Figure 1, include input capacitance EC1, capacitor
C6, kenotron, high-frequency strobe filter, first order common mode low-pass filter, second level common mode low-pass filter and
Difference LC second-order low-pass filter.The schematic diagram of the detailed DC power supply filter circuit for GJB-151A is as shown in Figure 3.
Input capacitance EC1 and capacitor C6 are parallel to input port A and input port B respectively, for the filtering of power supply signal,
Input capacitance EC1 is the electrolytic capacitor of 470uF/50V, and capacitor C6 is the capacitor of 10nF.
Kenotron anode tap is connect with input port A, and kenotron cathode terminal and high-frequency strobe are filtered
The input terminal of wave device connects.When input port A connects positive pole, when input port B connects power cathode, DC power supply filter circuit
It works normally, it is unidirectional due to kenotron when input port B connects positive pole when input port A connects power cathode
Conducting effect, kenotron disconnect, and DC power supply filter circuit stops working, therefore will not burn because of reversed access
The component in DC power supply filter circuit and backend load is ruined, protection is played the role of.In the present embodiment, high-voltage rectifying
Diode model C653M.
The input terminal of high-frequency strobe filter and the cathode of kenotron connect, the output of high-frequency strobe filter
End is connect with an input terminal of first order common mode low-pass filter, when high-frequency strobe filter is in strobe state, is used for
Filter out the high fdrequency component in power supply signal.High-frequency strobe filter includes wire jumper S7, wire jumper S11 and High frequency filter magnetic bead LM1,
Wire jumper S7 connects with High frequency filter magnetic bead LM1, and wire jumper S11 is parallel to the branch where wire jumper S7 and High frequency filter magnetic bead LM1.When
Wire jumper S7 is connected, and when S11 is disconnected, High frequency filter magnetic bead LM1 series connection is total in the output end and the first order of kenotron
Between one input terminal of mould low-pass filter, high fdrequency component is filtered out, the inductance ginseng of the frequency and High frequency filter magnetic bead LM1 that filter out
Number is related, in the present embodiment, the model BL02RN2-R62-01 of High frequency filter magnetic bead LM1.When wire jumper S7 is disconnected, S11 is led
When logical, High frequency filter magnetic bead LM1 is shorted, so that high-frequency strobe filter no longer filters out corresponding high-frequency band, is being actually used
In, it can be by being connected and disconnected from wire jumper S7 and S11, to be arranged whether circuit filters out high fdrequency component.
One input terminal of first order common mode low-pass filter is connect with the output end of high-frequency strobe filter, another is defeated
Enter end to connect with input port B, two output ends of first order common mode low-pass filter respectively with second level common mode low-pass filtering
Two input terminals of device connect, and first order common mode low-pass filter is for realizing four kinds of filtering frequencies of first order common mode low-pass filter
The selection of section.
In the present embodiment, the selections of four kinds of filtering frequency ranges are realized by switching on and off for wire jumper.The first order is total
Mould low-pass filter includes conjugation inductance L1, L2, L6, L10, wire jumper S1, S2, S3, S5, S8, S12, S15 and S18 and capacitor
C1,C3,C4,C5,C8.Wire jumper S1, S2, S3, S5, S8, S12, S15 and S18 totally 8 wire jumpers, are divided into four groups, are first respectively
Group S1 and S2, second group of S3 and S5, third group S8 and S12, one end of the 4th group of S15 and S18, S1 and S2 respectively with conjugation inductance
Two input terminals of L1 connect；One end of S3 and S5 is connect with two input terminals of conjugation inductance L2 respectively；One end of S8 and S12
It is connect respectively with two input terminals of conjugation inductance L6；One end of S15 and S18 respectively with conjugation inductance L10 two input terminals
Connection, the other end of wire jumper S1, S3, S8, S15 are parallel to the output end of high-frequency strobe filter；Wire jumper S2, S5, S12, S18's
The other end is parallel to input port B.
An output end being conjugated in two output ends of inductance L1 is grounded by capacitor C1, and another output passes through
Capacitor C8 ground connection, two output ends for being conjugated inductance L1 are also in parallel with capacitor C3, C4, C5 respectively；Two for being conjugated inductance L2 are defeated
An output end in outlet is grounded by capacitor C1, and another output is grounded by capacitor C8, and two of conjugation inductance L2
Output end is also in parallel with capacitor C3, C4, C5 respectively；An output end being conjugated in two output ends of inductance L6 passes through capacitor C1
Ground connection, another output is grounded by capacitor C8, two output ends of conjugation inductance L6 also respectively with capacitor C3, C4, C5 simultaneously
Connection；An output end being conjugated in two output ends of inductance L10 is grounded by capacitor C1, and another output passes through capacitor C8
Ground connection, two output ends for being conjugated inductance L10 are also in parallel with capacitor C3, C4, C5 respectively, the electricity of capacitor C1, C3, C4, C5, C8
Capacitance is respectively as follows: 10nF, 4.7uF, 4.7 uF, 1 uF, 10nF, and the both ends of capacitor C3, C4, C5 in parallel are first order common modes
Two output ends of low-pass filter.
The filter cutoff frequency of second level common mode low-pass filtering is related with the inductance parameters being strobed.As first group of wire jumper S1
It is all connected with S2, and when other group of wire jumper all disconnects, conjugation inductance L1 accesses circuit, and the inductance parameters of L1 are 10uH-2A, makes
The filter cutoff frequency for obtaining second level common mode low-pass filtering is 10.7kHz.
When first group of wire jumper S3 and S5 are connected, and other group of wire jumper all disconnects, conjugation inductance L2 accesses circuit, L2
Inductance parameters be 100uH-2A so that the filter cutoff frequency of second level common mode low-pass filtering be 3.4kHz.
When first group of wire jumper S8 and S12 are connected, and other group of wire jumper all disconnects, conjugation inductance L6 accesses circuit,
The inductance parameters of L6 are 20mH-2A, so that the filter cutoff frequency of second level common mode low-pass filtering is 1.1kHz.
When first group of wire jumper S15 and S18 are connected, and other group of wire jumper all disconnects, conjugation inductance L10 access electricity
Road, the inductance parameters of L10 are 50mH-2A, so that the filter cutoff frequency of second level common mode low-pass filtering is 200Hz.The first order
Under four filter cutoff frequencies of common mode low-pass filter, using simulation software, analogue simulation is carried out to entire circuit, is increased
Benefit-frequency simulation comparison figure is as shown in figure 4, as seen from Figure 4, when inductance value distinguishes value are as follows: 10uH, 100uH, 20mH and
When 50mH, corresponding cutoff frequency is 10.7 kHz, 3.4kHz, 1.1kHz and 0.2kHz, and the frequency range other than cutoff frequency increases
Benefit falls sharply, and circuit can be realized the low-pass filtering of corresponding band.
Two input terminals of second level common mode low-pass filter are exported with two of first order common mode low-pass filter respectively
End connection, the output end of second level common mode low-pass filter connect with two input terminals of difference LC second-order low-pass filter respectively
It connects.Second level common mode low-pass filter includes inductance L7, wire jumper S9 and wire jumper S13, in the present embodiment, the inductance parameters of inductance L7
For 20mH-2A.As shown in figure 3, inductance L7 is shorted, and cannot access circuit when wire jumper S9 and wire jumper S13 are connected；Work as jump
When line S9 and wire jumper S13 are disconnected, inductance L7 accesses circuit, when inductance L7 is accessed, two input terminals of L7 and capacitor C3, C4 and
C5 is in parallel, and two output ends of inductance L7 are connect with two input terminals of difference LC second-order low-pass filter, so that the second level is total
Mould low pass filter cutoff frequency is 11.3kHz, under the common mode low pass filter cutoff frequency 11.3kHz of the second level, using emulation
Software carries out analogue simulation to entire circuit, obtains gain versus frequency simulation comparison figure as shown in figure 5, as seen from Figure 5, when
Inductance value distinguishes value are as follows: when 20mH, corresponding cutoff frequency is 11.3kHz, and the frequency range other than cutoff frequency, gain is sharp
Subtract, circuit can be realized the low-pass filtering of corresponding band.
Two input terminals of difference LC second-order low-pass filter respectively with two output ends of second level common mode low-pass filter
Connection, two output ends of difference LC second-order low-pass filter are that the power supply signal of DC power supply filter circuit exports, wherein one
The output end of a difference LC second-order low-pass filter connects direct-current working volts VOUT, another difference LC second-order low-pass filter
Output endmatcher shell.
Difference LC second-order low-pass filter includes inductance L3, L4, L5, L8, L9 and L11, wire jumper S4, S6, S10, S14, S16
And S17 and capacitor C2, C7, C9,
Wherein, wire jumper S4 and the inductance L3 first branch in series；Wire jumper S6 and inductance L4 second branch in series；Wire jumper
S10 and inductance L5 third branch in series；Wire jumper S14 and inductance L8 the 4th branch in series；Wire jumper S16 and inductance L9
5th branch in series；Wire jumper S17 and inductance L11 the 6th branch in series, as shown in figure 3, in conjunction with Fig. 1 it can be seen that
After the first branch, second branch and third branch circuit parallel connection, connect access differential LC second-order low-pass filter input terminal C and
Output end E；
After 4th branch, the 5th branch and the 6th branch circuit parallel connection, connect access differential LC second-order low-pass filter input terminal D and
Output end F；
The both ends capacitor C9 are connect with output end E and output end F respectively；
One end of capacitor C2 is connect with input terminal C, other end ground connection；
One end of capacitor C7 is connect with input terminal D, other end ground connection；
The output end E of difference LC second-order low-pass filter has been also connected with DC voltage VOUT；
The output end F of difference LC second-order low-pass filter is with picking shell.
In the present embodiment, the inductance parameters of inductance L3, L4, L5, L8, L9 and L11 are respectively as follows: 1uH-2.5A, 10uH-
2.5A、100uH-2.5A、100uH-2.5A、10uH-2.5A、1uH-2.5A。
Difference LC second-order low-pass filter works under Three models:
The first mode: switch S4, S6, S10 closure, corresponding inductance L3, L4, L5 parallel connection access differential LC second-order low-pass filter
The input terminal C and output end E of device；Switch S14 closure, switch S16 and S17 are disconnected, corresponding inductance L8 access differential LC second order
The input terminal D and output end F of low-pass filter, at this point, the filter cutoff frequency of fourth stage difference LC second-order low-pass filter is
1591.5 kHz。
Second of mode: switch S4 is disconnected, switch S6 and S10 closure, corresponding inductance L4, L5 parallel connection access differential LC bis-
The input terminal C and output end E of rank low-pass filter；Switch S14 and S16 closure, switch S17 are disconnected, and corresponding inductance L8, L9 are simultaneously
Join the input terminal D and output end F of access differential LC second-order low-pass filter, at this point, fourth stage difference LC second-order low-pass filter
Filter cutoff frequency is 503.3kHz.
The third mode: switch S4 and S6 are disconnected, switch S10 closure, corresponding inductance L5 parallel connection access differential LC second order
The input terminal C and output end E of low-pass filter；Switch S14, S16, S17 closure, corresponding inductance L8, L9, L11 parallel connection access
The input terminal D and output end F of difference LC second-order low-pass filter, at this point, the filtering of fourth stage difference LC second-order low-pass filter is cut
Only frequency is 159.2kHz, under three operating modes of difference LC second-order low-pass filter, using simulation software, to entire circuit into
Row analogue simulation obtains gain versus frequency simulation comparison figure as shown in fig. 6, as seen from Figure 6, when inductance value distinguishes value are as follows:
When 1uH, 10uH and 100uH, corresponding cutoff frequency be 1591.5 kHz, 503.3kHz and 159.2kHz, cutoff frequency with
Outer frequency range, gain fall sharply, and circuit can be realized the low-pass filtering of corresponding band.
This circuit can be applied to power module, power supply unit, power-supply system DC power supply filter circuit in.Especially may be used
For being directed to the DC power supply filter circuit of GJB-151A, other than it can effectively prevent reverse power connection to the damage of equipment, will also
External conduct radiation inside equipment has done effective barrier.And it can be according to the test result of device context, flexible setting filter
Wave parameter changes the filtering frequency range of filter.Preferably equipment is allowed to reach GJB151A correlation EMC Requirements.
Claims (10)
1. a kind of DC power supply filtering method for GJB-151A, power supply signal successively pass through first order High frequency filter, second
Grade common mode low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter, which is characterized in that first
Before grade High frequency filter, realize that the input of power filter reversely accesses protection by genotron, and in the first order
Before High frequency filter, second level common mode low-pass filtering, third level common mode low-pass filtering and fourth stage difference LC second-order low-pass filter
Frequency electing and passing has been carried out respectively, and the frequency electing and passing realizes the selection of the filtering frequency range of the DC wave filter.
2. a kind of DC power supply filtering method for GJB-151A as described in claim 1, which is characterized in that described second
The filter cutoff frequency of grade common mode low-pass filtering can be respectively set are as follows: 10.7kHz, 3.4kHz, 1.1kHz or 200Hz.
3. a kind of DC power supply filtering method for GJB-151A as described in claim 1, which is characterized in that the described 4th
Grade difference LC second-order low-pass filter filter cutoff frequency can be respectively set are as follows: 1591.5 kHz, 503.3kHz or
159.2kHz。
4. a kind of DC power supply filter circuit for GJB-151A, which is characterized in that including input capacitance EC1, capacitor C6, height
Press rectifier diode, high-frequency strobe filter, first order common mode low-pass filter, second level common mode low-pass filter and difference LC
Second-order low-pass filter,
The input capacitance EC1 and the capacitor C6 are parallel to input port A and input port B respectively, for power supply signal
Filtering；
The anode of the kenotron is connect with the input port A, the cathode of the kenotron and institute
The input terminal connection of high-frequency strobe filter is stated, when the input port A connection input power cathode, the input port B connects
When connecing input power cathode, the kenotron is not turned on；
The input terminal of the high-frequency strobe filter is connect with the output end of the kenotron, the high-frequency strobe filter
The output end of wave device is connect with an input terminal of the first order common mode low-pass filter, at the high-frequency strobe filter
When strobe state, for filtering out the high fdrequency component in input power signal；
One input terminal of the first order common mode low-pass filter is connect with the output end of high-frequency strobe filter, another is defeated
Enter end connect with the input port B, two output ends of the first order common mode low-pass filter respectively with the second level
Two input terminals of common mode low-pass filter connect, and the first order common mode low-pass filter is for realizing the first order common mode
The selection of four kinds of low-pass filter filtering frequency ranges；
Two input terminals of the second level common mode low-pass filter, two with the first order common mode low-pass filter respectively
Output end connection, the output end of the second level common mode low-pass filter are defeated with two of difference LC second-order low-pass filter respectively
Enter end connection, when the second level common mode low-pass filter is in strobe state, for filtering out preset lowpass frequency
Signal；
Described two input terminals of difference LC second-order low-pass filter are defeated with two of the second level common mode low-pass filter respectively
Outlet connection, two output ends of the difference LC second-order low-pass filter are a kind of DC power supply for GJB-151A
The power supply signal of filter circuit exports, the output end connection DC operation electricity of one of them difference LC second-order low-pass filter
Pressure, the output end ground connection of another difference LC second-order low-pass filter.
5. a kind of DC power supply filter circuit for GJB-151A as claimed in claim 4, which is characterized in that described the
Level-one common mode low-pass filter includes: to be conjugated inductance L1, L2, L6, L10, capacitor C1, C3, C4, C5, C8 and gate,
There are two input terminal and four groups of output ends for the gate, and first group of two output end is respectively with the conjugation inductance L1's
Two input terminal connections, second group of two output end are connect with two input terminals of the conjugation inductance L2 respectively, third group two
A output end is connect with two input terminals of the conjugation inductance L6 respectively, and the 4th group of two output ends are electric with the conjugation respectively
Feel two input terminals connection of L10, gate further includes four groups of switching switches, and one group in closure four groups of switchings switch,
A conjugation inductance in described conjugation inductance L1, L2, L6, L10 can be accessed circuit；
Two input terminals of the conjugation inductance L1 are connect with first group of two output end of the gate, the conjugation electricity
The output end felt in two output ends of L1 is grounded by capacitor C1, and another output is grounded by capacitor C8, described
Two output ends for being conjugated inductance L1 are also in parallel with capacitor C3, C4, C5 respectively；
Two input terminals of the conjugation inductance L2 are connect with second group of two output end of the gate, the conjugation inductance
An output end in two output ends of L2 is grounded by capacitor C1, and another output is grounded by capacitor C8, described total
Two output ends of yoke inductance L2 are also in parallel with capacitor C3, C4, C5 respectively；
Two input terminals of the conjugation inductance L6 are connect with two output ends of third group of the gate, the conjugation inductance
An output end in two output ends of L6 is grounded by capacitor C1, and another output is grounded by capacitor C8, described total
Two output ends of yoke inductance L6 are also in parallel with capacitor C3, C4, C5 respectively；
Two input terminals of the conjugation inductance L10 are connect with the 4th group of two output ends of the gate, the conjugation electricity
The output end felt in two output ends of L10 is grounded by capacitor C1, and another output is grounded by capacitor C8, described
Two output ends for being conjugated inductance L10 are also in parallel with capacitor C3, C4, C5 respectively.
6. a kind of DC power supply filter circuit for GJB-151A as claimed in claim 5, which is characterized in that when described total
When yoke inductance L1 is gated, the filter cutoff frequency of the second level common mode low-pass filtering is 10.7kHz；
When conjugation inductance L2 gating, the filter cutoff frequency of the second level common mode low-pass filtering is 3.4kHz；
When conjugation inductance L6 gating, the filter cutoff frequency of the second level common mode low-pass filtering is 1.1kHz；
When conjugation inductance L10 gating, the filter cutoff frequency of the second level common mode low-pass filtering is 200Hz.
7. a kind of DC power supply filter circuit for GJB-151A as claimed in claim 4, which is characterized in that the difference
LC second-order low-pass filter includes inductance L3, L4, L5, L8, L9 and L11, switch S4, S6, S10, S14, S16 and S17, Yi Ji electricity
Hold C2, C7, C9,
Wherein, switch S4 and the inductance L3 first branch in series；Switch S6 and inductance L4 second branch in series；Switch
S10 and inductance L5 third branch in series；Switch S14 and inductance L8 the 4th branch in series；Switch S16 and inductance L9 goes here and there
Connection constitutes the 5th branch；Switch S17 and inductance L11 the 6th branch in series；
After the first branch, second branch and third branch circuit parallel connection, series connection accesses the difference LC second-order low-pass filter
Input terminal C and output end E；
After 4th branch, the 5th branch and the 6th branch circuit parallel connection, series connection accesses the difference LC second-order low-pass filter
Input terminal D and output end F；
The both ends the capacitor C9 are connect with output end E and output end F respectively；
One end of the capacitor C2 is connect with input terminal C, other end ground connection；
One end of the capacitor C7 is connect with input terminal D, other end ground connection.
8. a kind of DC power supply filter circuit for GJB-151A as claimed in claim 7, which is characterized in that the difference
The operating mode of LC second-order low-pass filter includes:
The first mode: switch S4, S6, S10, S14 closure, switch S16 and S17 are disconnected, corresponding inductance L3, L4, L5
Parallel connection accesses the input terminal C and output end E of the difference LC second-order low-pass filter, and described to close the switch, inductance L8 accesses institute
State the input terminal D and output end F of difference LC second-order low-pass filter；
Second of mode: the switch S4 and S17 is disconnected, and switch S6, S10, S14, S16 closure, corresponding inductance L4, L5 are in parallel
The input terminal C and output end E of the difference LC second-order low-pass filter are accessed, inductance L8, L9 parallel connection accesses the difference LC bis-
The input terminal D and output end F of rank low-pass filter；
The third mode: the switch S4 and S6 is disconnected, and switch S10, S14, S16, S17 closure, corresponding inductance L5 simultaneously couple
Enter the input terminal C and output end E of the difference LC second-order low-pass filter, inductance L8, L9, L11 parallel connection accesses the difference LC
The input terminal D and output end F of second-order low-pass filter.
9. a kind of DC power supply filter circuit for GJB-151A as claimed in claim 8, which is characterized in that
Under the first described mode, the filter cutoff frequency of the fourth stage difference LC second-order low-pass filter is 1591.5 kHz；
Under second of mode, the filter cutoff frequency of the fourth stage difference LC second-order low-pass filter is 503.3kHz；
Under the third described mode, the filter cutoff frequency of the fourth stage difference LC second-order low-pass filter is 159.2kHz.
10. being directed to GJB- comprising one kind as described in claim 4-9 is any in power module, power supply unit, power-supply system
The DC power supply filter circuit of 151A.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683882A (en) * | 2023-06-06 | 2023-09-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
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| CN107276377A (en) * | 2017-06-06 | 2017-10-20 | 李瑞峰 | A kind of power-supply filter device |
| CN109546634A (en) * | 2018-11-28 | 2019-03-29 | 北京精密机电控制设备研究所 | A kind of compound broadband filter circuit with anti surge voltage |
| CN210490722U (en) * | 2019-08-30 | 2020-05-08 | 成都紫瑞青云航空宇航技术有限公司 | Direct current power supply filter circuit for GJB-151A |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107276377A (en) * | 2017-06-06 | 2017-10-20 | 李瑞峰 | A kind of power-supply filter device |
| CN109546634A (en) * | 2018-11-28 | 2019-03-29 | 北京精密机电控制设备研究所 | A kind of compound broadband filter circuit with anti surge voltage |
| CN210490722U (en) * | 2019-08-30 | 2020-05-08 | 成都紫瑞青云航空宇航技术有限公司 | Direct current power supply filter circuit for GJB-151A |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116683882A (en) * | 2023-06-06 | 2023-09-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
| CN116683882B (en) * | 2023-06-06 | 2023-12-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
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