CN114464415A - Filter with sampling function and power supply filter circuit - Google Patents
Filter with sampling function and power supply filter circuit Download PDFInfo
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- CN114464415A CN114464415A CN202210165651.0A CN202210165651A CN114464415A CN 114464415 A CN114464415 A CN 114464415A CN 202210165651 A CN202210165651 A CN 202210165651A CN 114464415 A CN114464415 A CN 114464415A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2895—Windings disposed upon ring cores
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- H—ELECTRICITY
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- H01F37/00—Fixed inductances not covered by group H01F17/00
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a filter with a sampling function and a power supply filter circuit, and relates to the technical field of filters. The multi-coil common-mode inductance module comprises one or more multi-coil common-mode inductance modules which are connected in series, wherein each multi-coil common-mode inductance module comprises a ferrite toroidal core, a first coil group and a second coil group, wherein the first coil group and the second coil group are wound on the ferrite toroidal core; the first coil group and the second coil group respectively comprise two coils which are same in size and same in turn number and are symmetrically wound on the ferrite annular magnetic core. The dynamic response of the power supply can not be influenced by adding the electromagnetic filter under the condition that closed-loop parameters are not changed. Therefore, designers only need to consider the stability of the local end, and only need to wire according to requirements when the remote end is stable without considering compensation parameters. The difficulty of power debugging is greatly reduced, and the stability of the power supply and the system is improved.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a filter with a sampling function and a power supply filter circuit.
Background
In the field of power supply, the requirement for electromagnetic compatibility is getting tighter and tighter. A power supply often needs to be supplied over long wires. In the field of low-voltage power supply, the voltage drop is serious due to low voltage, and meanwhile, the electromagnetic interference problem is not negligible due to large current. In the prior art, an electromagnetic filter with electromagnetic compatibility is often required to be added at the power supply end of a power supply. The introduction of electromagnetic filters inevitably causes an increase in voltage drop. Therefore, the problem of large voltage drop at the far end is solved by adopting a far-end independent sampling circuit. And because of the introduction of the electromagnetic filter, a pole is added, and the influence on the control is larger. In particular, transient stability is difficult to adjust. Often forcing the use of methods to reduce the frequency of the zero. Even so, a relatively large low frequency ripple is always observed at the output.
Disclosure of Invention
The invention aims to provide a filter with a sampling function, which can ensure that the dynamic reaction of a power supply is not influenced by adding an electromagnetic filter under the condition that closed-loop parameters are not changed. Therefore, designers only need to consider the stability of the local end, and only need to wire according to requirements when the remote end is stable without considering compensation parameters. The difficulty of power debugging is greatly reduced, and the stability of the power supply and the system is improved.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present application provides a filter with a sampling function, including one or more multi-coil common-mode inductance modules connected in series, where any of the multi-coil common-mode inductance modules includes a ferrite toroidal core, and a first coil group and a second coil group wound around the ferrite toroidal core; the first coil group and the second coil group respectively comprise two coils which are same in size and same in turn number and are symmetrically wound on the ferrite annular magnetic core.
In some embodiments of the present invention, there are two of the plurality of serially connected multi-coil common mode inductor modules, which are a first multi-coil common mode inductor module and a second multi-coil common mode inductor module, respectively, and the first coil group includes a coil L1 and a coil L1; the second coil group includes coil S1 and coil S2; the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are further included; the coil S1 of the first multi-coil common mode inductance module is connected in series with the coil S1 of the second multi-coil common mode inductance module; the coil S2 of the first multi-coil common mode inductance module is connected in series with the coil S2 of the second multi-coil common mode inductance module; coil L1 of the first multi-coil common mode inductor module is connected in series with coil L1 of the second multi-coil common mode inductor module; coil L2 of the first multi-coil common mode inductor module is connected in series with coil L2 of the second multi-coil common mode inductor module; one end of the capacitor C1 is connected to one end of the coil S1 of the first multi-coil common mode inductor module, and the other end of the capacitor C1 is connected to one end of the coil L2 of the first multi-coil common mode inductor module; one end of a capacitor C2 is connected with the other end of the first multi-coil common mode inductance module coil S1, and the other end of a capacitor C2 is connected with the other end of the first multi-coil common mode inductance module coil L2; the free end of the coil S1 of the second multi-coil common mode inductor module is connected with the free end of the coil L2 of the second multi-coil common mode inductor module through a capacitor C3 and a capacitor C4.
In some embodiments of the present invention, the present invention further includes two differential mode inductance modules respectively connected in series with the multi-coil common mode inductance module, where any one of the differential mode inductance modules includes a battery cell, and a differential mode coil X1 and a differential mode coil W1 adapted to the battery cell; the coil L1 of the first coil group is connected in series with the differential mode coil X1 of one differential mode inductance module, and the coil S1 of the first coil group is connected in series with the differential mode coil W1 of the differential mode inductance module; the coil S2 of the first coil group is connected in series with the differential mode coil W2 of another differential mode inductance module, and the coil L2 of the first coil group is connected in series with the differential mode coil X2 of another differential mode inductance module.
In a second aspect, an embodiment of the present application provides a power filter circuit, which includes a control module, an external circuit, a filter T1 with a sampling function, and a front module and a rear module respectively connected to the filter; the external circuit, the control module, the front module, the filter T1 and the rear module are connected in sequence.
In some embodiments of the present invention, the control module includes a processor U1, an adjustable power supply V1, a power supply V2, a capacitor C1, a capacitor C8, a resistor R1, a resistor R12, an inductor L1, an inductor L2, and a fet S1; the power supply input end of the processor U1 is connected with a power supply; a reference power supply end, an oscillator end, a compensation end and a voltage feedback end of the processor U1 are respectively connected with an external circuit, a current sampling end of the processor U1 is connected with the anode of an adjustable power supply V1 through a resistor R1, the cathode of the adjustable power supply V1 is connected with the source of a field-effect tube S1, and the grid of the field-effect tube S1 is connected with the output end of the processor U1 through a resistor R12; the drain electrode of the field effect transistor S1 is grounded through an inductor L1 and a power supply V2; the drain of the field effect transistor S1 and the common terminal of the inductor L1 are connected with the front module through the inductor L2.
In some embodiments of the present invention, the external circuit includes a resistor R2, a resistor R3, a resistor R4, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and a transistor Q2; the reference power supply terminal of the processor U1 is grounded through a resistor R2 and a capacitor C2; the common end of the resistor R2 and the capacitor C2 is connected with the base electrode of the triode Q2; the collector of the triode Q2 is connected with the reference power supply end of the processor U1, the emitter of the triode Q2 is connected with the current sampling end of the processor U1 through a resistor R3, and the oscillator end of the processor U1 is connected with the base of the triode Q2; one end of a capacitor C3 is connected with the oscillator end of the processor U1, and the other end of the capacitor C3 is connected with the common end of the resistor R3 and the resistor R1; the compensation end of the processor U1 is connected with the front module through a capacitor C4; one end of the capacitor C4 is connected to the other end of the capacitor C4 via the capacitor C5 and the resistor R4.
In some embodiments of the present invention, the front module includes a capacitor C6, a capacitor C7, a capacitor C10, a resistor R5, a resistor R6, a resistor R7, a resistor R10, and a diode D3; the inductor L2 is connected to a first input terminal of the filter T1 through a diode D3; the inductor L2 is connected with the common end of the diode D3, the capacitor C6, the resistor R10 and the cathode of the diode D3; the common end of the diode D3 and the filter T1 is grounded through a capacitor C7 and a resistor R7; one end of the capacitor C10 is connected with the first input end of the filter T1, and the other end of the capacitor C10 is connected with the second input end of the filter T1; the second input end of the filter T1 is grounded through a resistor R6 and a resistor R5; the common terminal of resistor R6 and resistor R5 is connected to the compensation terminal of processor U1 through capacitor C4.
In some embodiments of the invention, the back-end module includes a resistor R11 and a capacitor C9; the first output terminal of the filter T1 is connected to ground through a resistor R11; the second output terminal of the filter T1 is grounded through a capacitor C9; a first output terminal of the filter T1 is connected to a second output terminal of the filter T1.
In some embodiments of the present invention, processor U1 is implemented with model number UC 3842.
In some embodiments of the present invention, diode D3 is model 30LJQ 150.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
under the condition that closed-loop parameters are not changed, the dynamic reaction of the power supply cannot be influenced by adding the electromagnetic filter. Therefore, designers only need to consider the stability of the local end, and only need to wire according to requirements when the remote end is stable without considering compensation parameters. The difficulty of power debugging is greatly reduced, and the stability of the power supply and the system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic circuit diagram of a filter with a sampling function according to the present invention;
FIG. 2 is a partial cross-sectional view of a filter with sampling function according to the present invention;
FIG. 3 is a simplified diagram of the winding of a filter coil with sampling function according to the present invention;
FIG. 4 is a schematic diagram of a sampling principle of a filter with a sampling function according to the present invention;
FIG. 5 is a schematic circuit diagram of a plurality of multi-coil common mode inductor modules connected in series according to the present invention;
FIG. 6 is a schematic circuit diagram of a multi-coil common mode inductor module and a differential mode inductor module connected in series according to the present invention;
FIG. 7 is a schematic diagram of a power filter circuit according to the present invention;
FIG. 8 is a schematic circuit diagram of a power filter circuit according to the present invention;
FIG. 9 is a schematic diagram of a conventional LC filtered switching power supply circuit of the present invention;
FIG. 10 is a schematic diagram of a filter circuit according to the present invention using a pi filter as filtering;
FIG. 11 is a waveform diagram illustrating the filtering result of a conventional LC filtering switching power supply according to the present invention;
FIG. 12 is a diagram illustrating the waveform of the result of filtering using a pi filter according to the present invention;
FIG. 13 is a waveform diagram illustrating the result of a power filter circuit according to the present invention;
icon: 1. an external circuit; 2. a control module; 3. a front module; 4. and a rear module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when products of the application are used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.
Example 1
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, a filter with a sampling function according to an embodiment of the present disclosure includes one or more serially connected multi-coil common mode inductor modules, where each multi-coil common mode inductor module includes a ferrite toroidal core, and a first coil group and a second coil group wound around the ferrite toroidal core; the first coil group and the second coil group respectively comprise two coils which are same in size and same in turn number and are symmetrically wound on the ferrite annular magnetic core.
In some embodiments of the present invention, in order to solve the above problems, the present design mainly improves the existing filter, and the improvement principle is to add a set of coils on the existing filter, the schematic diagram of which is shown in fig. 1, and to avoid interference of the first coil set and the second coil set due to size, the coil sizes adopt different diameters, as shown in fig. 2 and fig. 3; fig. 3 is a simplified view of the coil after winding, which is intended to show the winding pattern more clearly. The sampling principle is shown in fig. 4, and the added coils are monitored, so that the dynamic response of a power supply cannot be influenced by adding the electromagnetic filter under the condition that closed-loop parameters are not changed. Therefore, designers only need to consider the stability of the local end, and only need to wire according to requirements when the remote end is stable without considering compensation parameters. The difficulty of power debugging is greatly reduced, and the stability of the power supply and the system is improved.
Referring to fig. 5, in some embodiments of the invention, there are two multi-coil common mode inductor modules connected in series, which are a first multi-coil common mode inductor module and a second multi-coil common mode inductor module, respectively, and the first coil group includes a coil L1 and a coil L1; the second coil group includes coil S1 and coil S2; the capacitor C221, the capacitor C22, the capacitor C23 and the capacitor C24 are further included; the coil S1 of the first multi-coil common mode inductance module is connected in series with the coil S1 of the second multi-coil common mode inductance module; the coil S2 of the first multi-coil common mode inductance module is connected in series with the coil S2 of the second multi-coil common mode inductance module; coil L1 of the first multi-coil common mode inductor module is connected in series with coil L1 of the second multi-coil common mode inductor module; coil L2 of the first multi-coil common mode inductor module is connected in series with coil L2 of the second multi-coil common mode inductor module; one end of the capacitor C221 is connected to one end of the coil S1 of the first multi-coil common mode inductor module, and the other end of the capacitor C221 is connected to one end of the coil L2 of the first multi-coil common mode inductor module; one end of a capacitor C22 is connected with the other end of the first multi-coil common mode inductance module coil S1, and the other end of a capacitor C22 is connected with the other end of the first multi-coil common mode inductance module coil L2; the free end of the coil S1 of the second multi-coil common mode inductor module is connected with the free end of the coil L2 of the second multi-coil common mode inductor module through a capacitor C23 and a capacitor C24.
In some embodiments of the present invention, for a plurality of multi-coil common mode inductor modules connected in series, effective filtering can be performed for different frequencies, in this embodiment, two multi-coil common mode inductor modules connected in series are taken as an example, and since the multi-coil common mode inductor modules are connected in series only, the multi-coil common mode inductor modules can only be used as an L-type filter, and thus a capacitor is added to form an LC filter, thereby avoiding interference in some occasions unsuitable for the L-type filter.
Referring to fig. 6, in some embodiments of the present invention, the present invention further includes two differential mode inductance modules respectively connected in series with the multi-coil common mode inductance module, where each differential mode inductance module includes a battery cell, and a differential mode coil X1 and a differential mode coil W1 adapted to the battery cell; the coil L1 of the first coil group is connected in series with the differential mode coil X1 of one differential mode inductance module, and the coil S1 of the first coil group is connected in series with the differential mode coil W1 of the differential mode inductance module; the coil S2 of the first coil group is connected in series with the differential mode coil W2 of another differential mode inductance module, and the coil L2 of the first coil group is connected in series with the differential mode coil X2 of another differential mode inductance module.
In some embodiments of the present invention, for both the differential mode interference and the common mode interference, the differential mode inductor and the common mode inductor need to be used together, and therefore, after the differential mode inductor is added in this embodiment, due to the characteristics of the design, an implementation manner is that one common mode inductor module can be connected to two differential mode inductor modules, and compared with the prior art, one common mode inductor can be directly saved, so that the common mode interference and the differential mode interference are suppressed on the premise of saving cost.
Example 2
Referring to fig. 7, a power filter circuit provided in the embodiment of the present application includes a control module 2, an external circuit 1, a filter T1 with a sampling function, and a front module 3 and a rear module 4 respectively connected to the filter; the external circuit 1, the control module 2, the front module 3, the filter T1 and the rear module 4 are connected in sequence.
In some embodiments of the present invention, for the filter with the sampling function in the present design, the usage scenario is basically to filter the power supply, so as to design a power supply filter circuit, and the specific circuit connection manner is as follows:
referring to fig. 8, in some embodiments of the invention, the control module 2 includes a processor U1, an adjustable power supply V1, a power supply V2, a capacitor C1, a capacitor C8, a resistor R1, a resistor R12, an inductor L1, an inductor L2, and a fet S1; the power supply input end of the processor U1 is connected with a power supply; a reference power supply end, an oscillator end, a compensation end and a voltage feedback end of the processor U1 are respectively connected with the external circuit 1, a current sampling end of the processor U1 is connected with the anode of an adjustable power supply V1 through a resistor R1, the cathode of the adjustable power supply V1 is connected with the source of a field-effect tube S1, and the grid of the field-effect tube S1 is connected with the output end of the processor U1 through a resistor R12; the drain electrode of the field effect transistor S1 is grounded through an inductor L1 and a power supply V2; the drain of the field effect transistor S1 and the common terminal of the inductor L1 are connected to the front module 3 via an inductor L2.
Referring to fig. 8, in some embodiments of the invention, the external circuit 1 includes a resistor R2, a resistor R3, a resistor R4, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and a transistor Q2; the reference power supply terminal of the processor U1 is grounded through a resistor R2 and a capacitor C2; the common end of the resistor R2 and the capacitor C2 is connected with the base electrode of the triode Q2; the collector of the triode Q2 is connected with the reference power supply end of the processor U1, the emitter of the triode Q2 is connected with the current sampling end of the processor U1 through a resistor R3, and the oscillator end of the processor U1 is connected with the base of the triode Q2; one end of a capacitor C3 is connected with the oscillator end of the processor U1, and the other end of the capacitor C3 is connected with the common end of the resistor R3 and the resistor R1; the compensation end of the processor U1 is connected with the front module 3 through a capacitor C4; one end of the capacitor C4 is connected to the other end of the capacitor C4 via the capacitor C5 and the resistor R4.
Referring to fig. 8, in some embodiments of the present invention, the front module 3 includes a capacitor C6, a capacitor C7, a capacitor C10, a resistor R5, a resistor R6, a resistor R7, a resistor R10, and a diode D3; the inductor L2 is connected to a first input terminal of the filter T1 through a diode D3; the inductor L2 is connected with the common end of the diode D3, the capacitor C6, the resistor R10 and the cathode of the diode D3; the common end of the diode D3 and the filter T1 is grounded through a capacitor C7 and a resistor R7; one end of the capacitor C10 is connected with the first input end of the filter T1, and the other end of the capacitor C10 is connected with the second input end of the filter T1; the second input end of the filter T1 is grounded through a resistor R6 and a resistor R5; the common terminal of resistor R6 and resistor R5 is connected to the compensation terminal of processor U1 through capacitor C4.
Referring to fig. 8, in some embodiments of the invention, the rear module 4 includes a resistor R11 and a capacitor C9; the first output terminal of the filter T1 is connected to ground through a resistor R11; the second output terminal of the filter T1 is grounded through a capacitor C9; a first output of the filter T1 is connected to a second output of the filter T1.
In some embodiments of the present invention, in order to verify the difference between the present design and the existing design, the control circuit and the external module are set to be quantitative by using a control variable, and the front module 3, the rear module 4 and the filter T1 are changed for testing. Referring to fig. 9, for the switching power supply using the conventional LC filtering, the power supply ripple is output at 100V and 1000W, in this case, the power supply ripple is less than or equal to 500 MVP-P. Contains a large amount of high-frequency ripple components. The low frequency ripple is only less than or equal to 200MVP-P, as shown in FIG. 11. Referring to fig. 10, a pi-type filter is used as a filtering principle diagram of filtering. Generally, a pi-type filter is used for filtering, and a stable control loop is difficult to obtain due to the addition of poles. Because the mode of combining voltage sampling and inductance is adopted, the ripple waves are well filtered while the capacitance is reduced. 100V, 1000W output, and the power supply ripple is less than or equal to 400MVP-P in the example. Mainly contains low frequency ripples, and high frequency ripples is almost filtered out. As shown in fig. 12. Referring to fig. 8, a filtering schematic diagram of the present design with sampled pi-type filtering is shown. The capacitor C10 is a matching capacitor. Depending on the inductive material and the inductive properties. 100V, 1000W output, and the power supply ripple is less than or equal to 10MVP-P in the example. As shown in fig. 13. It can be seen from fig. 11, 12 and 13 that the present design improves the conventional filter, so that the far-end sampling and closed-loop structure of the power supply (switching power supply or linear power supply) is substantially improved. And the stability and transient response of the whole power supply system are enhanced through miniaturization and integration improvement, the structure of an electromagnetic compatibility product is changed, and the electromagnetic compatibility power supply system has strong practical significance.
In some embodiments of the present invention, the processor U1 is of the type UC 3842.
In some embodiments of the present invention, the diode D3 is model 30LJQ 150.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A filter with a sampling function is characterized by comprising one or more multi-coil common-mode inductance modules which are connected in series, wherein any multi-coil common-mode inductance module comprises a ferrite toroidal core, a first coil group and a second coil group which are wound on the ferrite toroidal core; the first coil group and the second coil group respectively comprise two coils which are same in size and same in turn number, and the coils are symmetrically wound on the ferrite annular magnetic core.
2. The filter with sampling function of claim 1, wherein there are two of the plurality of serially connected multi-coil common mode inductor modules, which are a first multi-coil common mode inductor module and a second multi-coil common mode inductor module, respectively, and the first coil group comprises a coil L1 and a coil L1; the second coil group comprises coil S1 and coil S2; the capacitor C221, the capacitor C22, the capacitor C23 and the capacitor C24 are further included; coil S1 of the first multi-coil common mode inductor module is connected in series with coil S1 of the second multi-coil common mode inductor module; the coil S2 of the first multi-coil common mode inductance module is connected in series with the coil S2 of the second multi-coil common mode inductance module; coil L1 of the first multi-coil common mode inductance module is connected in series with coil L1 of the second multi-coil common mode inductance module; coil L2 of the first multi-coil common mode inductance module is connected in series with coil L2 of the second multi-coil common mode inductance module; one end of the capacitor C221 is connected to one end of the coil S1 of the first multi-coil common mode inductor module, and the other end of the capacitor C221 is connected to one end of the coil L2 of the first multi-coil common mode inductor module; one end of the capacitor C22 is connected to the other end of the first multi-coil common mode inductor module coil S1, and the other end of the capacitor C22 is connected to the other end of the first multi-coil common mode inductor module coil L2; the free end of the coil S1 of the second multi-coil common mode inductance module is connected with the free end of the coil L2 of the second multi-coil common mode inductance module through the capacitor C23 and the capacitor C24.
3. The filter with the sampling function according to claim 1, further comprising two differential mode inductance modules respectively connected in series with the multi-coil common mode inductance module, wherein any one of the differential mode inductance modules comprises a cell and a differential mode coil X1 and a differential mode coil W1 adapted to the cell; the coil L1 of the first coil group is connected in series with the differential mode coil X1 of one of the differential mode inductance modules, and the coil S1 of the first coil group is connected in series with the differential mode coil W1 of the differential mode inductance module; the coil S2 of the first coil group is connected in series with the differential mode coil W2 of another differential mode inductance module, and the coil L2 of the first coil group is connected in series with the differential mode coil X2 of another differential mode inductance module.
4. A power supply filter circuit, which is characterized by comprising a control module, an external circuit, a filter T1 with a sampling function as any one of the filter modules 1-3, and a front module and a rear module which are respectively connected with the filter; the external circuit, the control module, the front module, the filter T1 and the rear module are connected in sequence.
5. The power filter circuit of claim 4, wherein the control module comprises a processor U1, an adjustable power supply V1, a power supply V2, a capacitor C1, a capacitor C8, a resistor R1, a resistor R12, an inductor L1, an inductor L2, and a field effect transistor S1; the power supply input end of the processor U1 is connected with a power supply; a reference power supply end, an oscillator end, a compensation end and a voltage feedback end of the processor U1 are respectively connected with the external circuit, a current sampling end of the processor U1 is connected with the anode of the adjustable power supply V1 through a resistor R1, the cathode of the adjustable power supply V1 is connected with the source of the field-effect tube S1, and the gate of the field-effect tube S1 is connected with the output end of the processor U1 through a resistor R12; the drain electrode of the field effect transistor S1 is grounded through the inductor L1 and the power supply V2; the drain electrode of the field effect transistor S1 and the common end of the inductor L1 are connected with the front module through the inductor L2.
6. The power filter circuit as claimed in claim 5, wherein the external circuit comprises a resistor R2, a resistor R3, a resistor R4, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a transistor Q2; the reference power supply end of the processor U1 is grounded through the resistor R2 and the capacitor C2; the common end of the resistor R2 and the capacitor C2 is connected with the base electrode of the triode Q2; the collector of the transistor Q2 is connected with the reference power supply terminal of the processor U1, the emitter of the transistor Q2 is connected with the current sampling terminal of the processor U1 through the resistor R3, and the oscillator terminal of the processor U1 is connected with the base of the transistor Q2; one end of the capacitor C3 is connected to the oscillator end of the processor U1, and the other end of the capacitor C3 is connected to a common end of the resistor R3 and the resistor R1; the compensation end of the processor U1 is connected with the front module through a capacitor C4; one end of the capacitor C4 is connected to the other end of the capacitor C4 through the capacitor C5 and the resistor R4.
7. The power supply filter circuit as claimed in claim 6, wherein said front-end module comprises a capacitor C6, a capacitor C7, a capacitor C10, a resistor R5, a resistor R6, a resistor R7, a resistor R10 and a diode D3; the inductor L2 is connected to the first input terminal of the filter T1 through the diode D3; the inductor L2 is connected with the common terminal of the diode D3, the capacitor C6, the resistor R10 and the cathode of the diode D3; the common terminal of the diode D3 and the filter T1 is grounded through the capacitor C7 and the resistor R7; one end of the capacitor C10 is connected with the first input end of the filter T1, and the other end of the capacitor C10 is connected with the second input end of the filter T1; the second input end of the filter T1 is grounded through the resistor R6 and the resistor R5; the common terminal of the resistor R6 and the resistor R5 is connected to the compensation terminal of the processor U1 through the capacitor C4.
8. The power filter circuit of claim 7, wherein the post-module comprises a resistor R11 and a capacitor C9; the first output terminal of the filter T1 is connected to ground through the resistor R11; a second output terminal of the filter T1 is connected to ground through the capacitor C9; a first output of the filter T1 is connected to a second output of the filter T1.
9. The power supply filter circuit as claimed in claim 5, wherein said processor U1 is of type UC 3842.
10. A power filter circuit as claimed in claim 7, wherein said diode D3 is of the type 30LJQ 150.
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