CN117294125A - Mirror-image-conducted symmetrical BUCK active filter converter - Google Patents
Mirror-image-conducted symmetrical BUCK active filter converter Download PDFInfo
- Publication number
- CN117294125A CN117294125A CN202311576749.6A CN202311576749A CN117294125A CN 117294125 A CN117294125 A CN 117294125A CN 202311576749 A CN202311576749 A CN 202311576749A CN 117294125 A CN117294125 A CN 117294125A
- Authority
- CN
- China
- Prior art keywords
- switching tube
- inductor
- mirror
- loop
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 47
- 238000001914 filtration Methods 0.000 abstract description 29
- 230000000694 effects Effects 0.000 description 9
- 239000000243 solution Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a mirror-image-conducted symmetrical BUCK active filter converter, and relates to the technical field of active filtering. The invention comprises a power loop and a filter loop which are connected with each other; the power loop comprises an inductor, a first switching tube and a second switching tube which are connected in series; the filter loop comprises a capacitor, a fitting inductance network, a third switching tube and a fourth switching tube which are connected in series; the inductor, the capacitor and the fitting inductance network are connected in series, one end of the inductor is connected between the first switching tube and the second switching tube, one end of the fitting inductance network is connected between the third switching tube and the fourth switching tube, and two ends of the first switching tube and the second switching tube which are connected in series and two ends of the third switching tube and the fourth switching tube which are connected in series are connected with the anode and the cathode of an input power supply Vin. The invention can greatly reduce the output current ripple of the power supply module, and simultaneously reduce the requirements of the circuit on inductance and capacitance values of the inductor and the capacitor, thereby reducing the volume of the circuit.
Description
Technical Field
The invention relates to the technical field of active filtering, in particular to a mirror-image-conduction symmetrical BUCK active filtering converter.
Background
The BUCK circuit is a DC/DC converter based on the inductance energy storage principle, and converts an input high voltage into an output low voltage by controlling the on and off states of a switching tube through a duty ratio, so as to provide a stable power supply for equipment. The BUCK circuit is often used as a regulated power supply of various electronic equipment or used for providing a stable power supply for a later-stage converter, and has a wide application range.
Nowadays, the electrical and electronic equipment has higher requirements on the output quality of a power supply, and it is important to provide high-quality power supply for the electrical and electronic equipment. Therefore, the filtering of the output voltage of the switching power supply has important practical significance and application value. The BUCK circuit can generate larger current ripple on the energy storage inductor due to the on and off of the switching tube, and the quality of an output power supply is affected. Meanwhile, in order to improve the power density of the power supply module, the switching frequency of the power supply module is often improved, so that the purposes of reducing the weight and the volume of the power supply module and improving the power density are achieved, but along with the rising of the switching frequency, the power supply module can generate high-frequency electromagnetic interference, and the quality of the power supply is seriously affected.
At present, the DC/DC converter is usually filtered by increasing the inductance of the output inductor and performing high-frequency filtering at the output end, which usually increases the volume and weight of the switching power supply. The existing active filtering mode mainly collects current noise through a transformer, and the current noise is fitted for reverse injection, so that output ripple waves are reduced, but the control mode is complex, and meanwhile, the volume and the weight of a power supply are difficult to reduce.
Disclosure of Invention
Aiming at the technical problem that the volume and weight of a BUCK circuit cannot be effectively reduced and the filtering effect is improved in the prior filtering technology, the invention provides a mirror-image-conducted symmetrical BUCK active filtering converter. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a mirror-image-conducted symmetrical BUCK active filter converter, which comprises a power loop and a filter loop which are connected with each other; the power loop comprises an inductor L, a first switching tube S1 and a second switching tube S2 which are connected in series; the filter circuit comprises a capacitor C1, a fitting inductance network ZL, a third switching tube S3 and a fourth switching tube S4 which are connected in series; the inductor L, the capacitor C1 and the fitting inductor network ZL are connected in series, one end of the inductor L is connected between the first switching tube S1 and the second switching tube S2, one end of the fitting inductor network ZL is connected between the third switching tube S3 and the fourth switching tube S4, and both ends of the first switching tube S1 and the second switching tube S2 which are connected in series and both ends of the third switching tube S3 and the fourth switching tube S4 which are connected in series are connected with the positive electrode and the negative electrode of an input power supply Vin; when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are in mirror conduction, the current fluctuation generated by the fitting inductance network ZL is identical in amplitude and opposite in phase to the current fluctuation generated by the inductance L, the generated current fluctuation isolates a direct current component through the capacitor C1, and the obtained alternating current component can offset the alternating current component corresponding to the inductance L.
Preferably, when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are turned on in a mirror image, the first switching tube S1 and the second switching tube S2 are not turned on at the same time.
Preferably, when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are turned on in a mirror image, the third switching tube S3 and the fourth switching tube S4 are not turned on at the same time.
Preferably, when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are mirror-turned on, when the power loop current flows through the first switching tube S1, the current of the filter loop flows through the fourth switching tube S4.
Preferably, when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are mirror-turned on, when the power loop current flows through the second switching tube S2, the current of the filter loop flows through the third switching tube S3.
Preferably, the power supply further comprises a load resistor Rload, one end of the load resistor Rload is connected between the capacitor C1 and the inductor L, and the other end of the load resistor Rload is connected with the input power supply Vin.
Preferably, the load resistor also comprises an output capacitor C0, wherein one end of the output capacitor C0 is connected between the capacitor C1 and the inductor L, and the other end of the output capacitor C0 is connected with one end of the load resistor Rload.
Preferably, the loop formed by the input power Vin, the third switching tube S3, the fourth switching tube S4, the fitting inductance network ZL, the capacitor C1, the output capacitor C0, and the load resistor Rload forms a symmetrical loop with the loop formed by the input power Vin, the first switching tube S1, the second switching tube S2, the inductance L, the output capacitor C0, and the load resistor Rload.
Preferably, seven continuous moments are set in one switching period, the first switching tube S1 is turned on at the first moment, and the third switching tube S3 is turned off at the first moment; the fourth switching tube S4 is conducted at the second moment; at the fourth moment, the first switching tube S1 and the fourth switching tube S4 are turned off simultaneously; the second switching tube S2 and the third switching tube S3 are simultaneously conducted at the fifth moment; at the seventh moment, the second switching tube S2 is turned off.
Preferably, an RLC parallel network is used as the fitted inductance network ZL.
By implementing one of the technical schemes, the invention has the following advantages or beneficial effects:
1. the circuit topology is simple, the control mode is simple, and the required components are few;
2. the filtering effect is not influenced by the duty ratio, so that the compensation current can be accurately generated, and the output ripple wave of the circuit is reduced;
3. the filtering loop only generates current ripple opposite to the current ripple of the power loop, the power of the filtering loop is smaller, the fitting inductance network is adopted to fit the inductance, and components with large volume and large weight are not needed.
Therefore, the invention can greatly reduce the output current ripple of the power supply module, and compared with the traditional BUCK converter which needs large inductance and large capacitance to filter the output, the invention can reduce the inductance and capacitance requirements of the circuit, thereby reducing the circuit volume.
Drawings
For a clearer description of the technical solutions of embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, in which:
FIG. 1 is a circuit diagram of a mirror-on symmetrical BUCK active filter converter in accordance with an embodiment of the present invention;
FIG. 2 is a diagram of a switching tube on signal waveform, an inductor current waveform, an impedance fitting network current waveform, and an output current waveform according to an embodiment of the present invention;
FIG. 3 is an RLC parallel network structure of an impedance fitting network of an embodiment of the present invention;
FIG. 4 is a graph comparing impedance curves of an inductance and impedance fitting network according to an embodiment of the present invention;
FIG. 5 is a graph of power loop current and filter loop current waveforms during operation of a mirror-on symmetrical BUCK active filter converter in accordance with an embodiment of the present invention;
FIG. 6 is a graph showing the comparison of current waveforms before and after the BUCK circuit is added to the active filter converter according to the embodiment of the present invention.
Detailed Description
For a better understanding of the objects, technical solutions and advantages of the present invention, reference should be made to the various exemplary embodiments described hereinafter with reference to the accompanying drawings, which form a part hereof, and in which are described various exemplary embodiments which may be employed in practicing the present invention. The same reference numbers in different drawings identify the same or similar elements unless expressly stated otherwise. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatuses, etc. that are consistent with certain aspects of the present disclosure as detailed in the appended claims, other embodiments may be utilized, or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the present disclosure. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The terms "connected," "coupled" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, communicatively connected, directly connected, indirectly connected via intermediaries, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to illustrate the technical solutions of the present invention, the following description is made by specific embodiments, only the portions related to the embodiments of the present invention are shown.
As shown in FIG. 1, the invention provides a mirror-image-conduction symmetrical BUCK active filter converter, which comprises a power loop and a filter loop which are connected with each other. The power circuit comprises an inductor L, a first switching tube S1 and a second switching tube S2 which are connected in series; the filter loop comprises a capacitor C1, a fitting inductance network ZL, a third switching tube S3 and a fourth switching tube S4 which are connected in series.
Further, the inductor L, the capacitor C1 and the fitting inductance network ZL are connected in series, one end of the inductor L is connected between the first switching tube S1 and the second switching tube S2, one end of the fitting inductance network ZL is connected between the third switching tube S3 and the fourth switching tube S4, and both ends of the first switching tube S1 and the second switching tube S2 which are connected in series, and both ends of the third switching tube S3 and the fourth switching tube S4 which are connected in series are connected with the positive electrode and the negative electrode of an input power source Vin.
Further, when the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 are in mirror conduction, the current fluctuation generated by the fitting inductance network ZL has the same amplitude and opposite phase to the current fluctuation generated by the inductance L, the generated current fluctuation isolates the direct current component through the capacitor C1, and the obtained alternating current component can offset the alternating current component corresponding to the inductance L.
The filtering loop only generates current ripples with the same amplitude and opposite phase to the current ripples of the power loop, the power is smaller, the fitting inductance network ZL is adopted to fit the inductance L, and components with large volume and large weight are not needed to be adopted; meanwhile, the output current ripple of the power module of the BUCK converter can be accurately and greatly reduced through mirror image conduction of the four switching tubes. Therefore, compared with the traditional BUCK converter which needs large inductance and large capacitance to filter output, the active filter converter can reduce the inductance and capacitance requirements of a circuit on inductance and capacitance, and therefore the circuit size is reduced.
As an alternative embodiment, when the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 are turned on in a mirror image, the first switching tube S1 and the second switching tube S2 are not turned on at the same time, and the third switching tube S3 and the fourth switching tube S4 are not turned on at the same time. Further, when the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 are turned on in a mirror image manner, when the current of the power loop flows through the first switching tube S1, the current of the filtering loop flows through the fourth switching tube S4; when the power loop current flows through the second switching tube S2, the current of the filter loop flows through the third switching tube S3.
As an alternative embodiment, the mirror-on symmetrical BUCK active filter converter further includes a load resistor Rload, one end of which is connected between the capacitor C1 and the inductor L, and the other end of which is connected to the input power Vin. Further, the mirror-image-conducted symmetrical BUCK active filter converter further comprises an output capacitor C0, one end of the output capacitor C0 is connected between the capacitor C1 and the inductor L, and the other end of the output capacitor C0 is connected with one end of the load resistor Rload. The current generated on the inductance L of the power loop isolates the direct current component through the capacitor C1, only the alternating current component is left, and the alternating current component can be accurately counteracted with the current of the filtering loop, so that the elimination of output current ripple is realized.
In the present embodiment, the capacitance of the capacitor C1 is smaller than the capacitance of the output capacitor C0.
As an example, further referring to fig. 1, the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are all enhancement type NMOS tubes. Specifically, the inductor L, the capacitor C1 and the fitting inductor network ZL are sequentially connected in series. One end of the inductor L is connected with the source electrode of the first switching tube S1 and the drain electrode of the second switching tube S2, and one end of the fitting inductor network ZL is connected with the source electrode of the third switching tube S3 and the drain electrode of the fourth switching tube S4; the drain electrode of the first switching tube S1 and the drain electrode of the third switching tube S3 are connected with the positive electrode of an input power source Vin, and the negative electrode of the input power source Vin is connected with the source electrode of the second switching tube S2 and the source electrode of the fourth switching tube S4; the output capacitor C0 and the load resistor Rload are connected in parallel, one end of the parallel connection is connected between the inductor L and the fitting inductance network ZL, and the other end of the parallel connection is connected with the cathode of the input power supply Vin.
In the circuit of this example, a loop formed by the input power Vin, the third switching tube S3, the fourth switching tube S4, the fitting inductance network ZL, the capacitor C1, the output capacitor C0 and the load resistor Rload forms a symmetrical loop with a loop formed by the input power Vin, the first switching tube S1, the second switching tube S2, the inductor L, the output capacitor C0 and the load resistor Rload, so as to form a symmetrical mirror-conducted symmetrical BUCK active filter converter. Specifically, the input power source on the power loop side corresponds to the input power source on the filter loop side, the first switching tube on the power loop side corresponds to the third switching tube on the filter loop side, the second switching tube on the power loop side corresponds to the fourth switching tube on the filter loop side, the inductance L on the power loop side corresponds to the fitted inductance network ZL on the filter loop side and the capacitance C1 (although the capacitance C1 is an asymmetric element, it is structurally symmetric), the output capacitance on the power loop side corresponds to the output capacitance on the filter loop side, the load resistance on the power loop side corresponds to the load resistance on the filter loop side, and thus the filter loop constitutes a symmetric active filter loop of the power loop. Finally, the effect is that through mirror image conduction, voltages with the same amplitude and opposite phases are generated on the inductance and the fitting inductance network. Thereby generating opposite ripple currents to cancel. The purpose of reducing the voltage is achieved by means of the image conduction filtering loop and the active filtering loop. In general, the circuit topology of the example is simple, the control mode is simple, and fewer components are required.
It should be noted that the filtering effect of the symmetrical BUCK active filter converter with the image being conducted is not affected by the duty ratio, so that the compensation current can be accurately generated, and the output ripple wave of the circuit is reduced. Specifically, let D be the switching tube duty ratio, ts be the switching period, the on-time of the first switching tube S1 and the fourth switching tube S4 be DxTs, the on-time of the second switching tube S2 and the third switching tube S3 be (1-D) xTs. The steady state of the circuit is analyzed assuming that the output voltage Vout across the load resistor Rload and the output voltage VC0 across the capacitor C1 are constant.
When the first switching tube S1 is turned on and the second switching tube S2 is turned off, the voltage on the inductor L is (Vin-Vout), and when the first switching tube S1 is turned off and the second switching tube S2 is turned on, the voltage on the inductor L is (-Vout), and the voltage can be obtained according to the volt-second balance principle: (Vin-Vout) ×d×ts+ (-Vout) × (1-D) ×ts=0), from which the output voltage Vout can be derived as:
Vout=D×vin （1）；
when the third switching tube S3 is turned on and the fourth switching tube S4 is turned off, the voltage on the fitting inductance network ZL is (Vin-VC 1-Vout), and when the third switching tube S3 is turned off and the fourth switching tube S4 is turned off, the voltage on the fitting inductance network ZL is- (VC1+Vout), and the fitting inductance network ZL can be obtained according to the volt-second balance principle: (-Vout-Vc 1) x D x Ts+ (Vin-Vc 1-Vout) x (1-D) x TS=0, from which the voltage VC1 across capacitor C1 can be deduced as:
VC1=(1-2D)×Vin （2）；
according to vc1= (1-2D) ×vin, it can be obtained that when the first switching tube S1 and the fourth switching tube S4 are turned on, and the second switching tube S2 and the third switching tube S3 are turned off, the voltage VL on the inductor L and the voltage VZL on the fitting inductor network ZL are respectively:
VL=Vin×(1-D) （3）；
VZL=-Vin×(1-D) （4）；
according to vc1= (1-2D) ×vin, it can be obtained that when the first switching tube S1 and the fourth switching tube S4 are turned off and the second switching tube S2 and the third switching tube S3 are turned on, the voltage VL on the inductor L and the voltage VZL on the fitting inductor network ZL are:
VL=-D×vin （5）；
VZL=D×vin （6）。
thus, after deriving from the above formula, the two inductors (the inductor L, the fitted inductor network ZL) will generate voltages with the same magnitude and opposite directions, no matter what the duty D is, so that current ripples opposite to the output loop are generated on the filter loop to cancel. The filtering effect of the symmetrical BUCK active filtering converter conducted by the mirror image is not affected by the duty ratio.
As shown in fig. 2, in order to achieve control stability (the control signal controls the on and off of the related switching tubes through the gates of the four switching tubes), the first switching tube S1 and the second switching tube S2 of the power loop are prevented from being simultaneously turned on, and the third switching tube S3 and the fourth switching tube S4 of the filtering loop are prevented from being simultaneously turned on, so that the voltage source Vin is directly connected. Seven continuous moments are arranged in one switching period (Ts), the first moment (t 0-t1 below) is when the first switching tube S1 is turned on, and the third switching tube S3 is turned off; the fourth switching tube S4 is conducted at the second moment (t 1-t 2); the first switching tube S1 and the fourth switching tube S4 are simultaneously turned off at the fourth moment (t 3-t 4); at the fifth moment (t 4-t 5), the second switching tube S2 and the third switching tube S3 are simultaneously conducted; at the seventh time (t 6-t 7), the second switching tube S2 is turned off, and the rest of the time has no switching operation. In this embodiment, the control manner of fig. 2 is adopted, so as to conveniently describe the current flow direction of the circuit, define the direction of the power loop switching tube flowing to the inductor L as positive, and define the current of the filter loop switching tube flowing to the fitting inductor network ZL as positive. Specific:
at time t0-t1, the first switching tube S1 is turned on, and the power loop current positively flows through the loop through the first switching tube S1. The third switching tube S3 is turned off, at this time, the filter loop forwards flows through the body diode of the fourth switching tube S4 to form reverse current, at this time, the voltage of the inductor L is vin× (1-D), the inductor current rises, the voltage of the fitting inductor network ZL is-vin× (1-D), and the inductor current drops.
At the time t1-t2, the fourth switching tube S4 is conducted, the current of the filtering loop is positive, the current flows through the main channel of the fourth switching tube S4, at the moment, the voltage of the inductor L is vin× (1-D), the inductor current rises, the voltage of the fitting inductor network ZL is-vin× (1-D), and the inductor current drops.
At time t2-t3, the filter loop current is negative, and flows through the main channel of the fourth switching tube S4, at the moment, the voltage of the inductor L is vin× (1-D), the inductor current rises, the voltage of the fitting inductor network ZL is-vin× (1-D), and the inductor current drops.
At time t3-t4, the first switching tube S1 and the fourth switching tube S4 are turned off simultaneously, the current of the power circuit flows through the body diode of the second switching tube S2 in the forward direction, and the current of the filtering circuit flows through the body diode of the third switching tube S3 in the reverse direction. At this time, the voltage of the inductor L is-d×vin, the current of the inductor L decreases, the voltage of the fitting inductor network ZL is d×vin, and the current of the fitting inductor network ZL increases.
At time t4-t5, the second switching tube S2 and the third switching tube S3 are simultaneously conducted, the current of the power circuit flows through the main channel of the second switching tube S2 in the forward direction, and the current of the filtering circuit flows through the main channel of the third switching tube S3 in the reverse direction. At this time, the voltage of the inductor L is-d×vin, the current of the inductor L decreases, the voltage of the fitting inductor network ZL is d×vin, and the current of the fitting inductor network ZL increases.
At time t5-t6, the current of the filter loop is positive, and flows through the main channel of the third switching tube S3 in the positive direction. At this time, the voltage of the inductor L is-d×vin, the current of the inductor L decreases, the voltage of the fitting inductor network ZL is d×vin, and the current of the fitting inductor network ZL increases.
At time t6-t7, the second switching tube S2 is turned off, the current of the power loop flows forward through the body diode of the second switching tube S2, at the moment, the voltage of the inductor L is-Dxvin, the current of the inductor L drops, the voltage of the fitting inductor network ZL is Dxvin, and the current of the fitting inductor network ZL rises.
The mirror image conduction of the power loop and the filtering loop can be realized through the control mode, a conduction dead zone is arranged between the first switching tube S1 and the second switching tube S2 of the power loop, and the third switching tube S3 and the fourth switching tube S4 of the filtering loop are provided with the conduction dead zone.
It should be noted that, in the active filter converter of this embodiment, a voltage having the same magnitude and opposite phase to the voltage of the inductor L needs to be applied to the fitting inductance network ZL to generate a current ripple opposite to the current ripple of the inductor L, in this process, the fitting inductance needs to be consistent with the filter inductance characteristic in a certain frequency band, the actual inductance contains various parasitic parameters, and the fitting inductance network needs to be obtained by means of impedance fitting.
As an alternative implementation, as shown in fig. 3, the present embodiment uses RLC parallel network as the fitted inductance network ZL. The RLC parallel network comprises a capacitor, an inductor and a resistor which are connected in parallel, wherein one end of the capacitor is connected with one end of the capacitor C1, and the other end of the capacitor is connected with the source electrode of the third switching tube S3 and the drain electrode of the fourth switching tube S4. Further, an RLC parallel network is used as an impedance fitting network ZL, which comprises the following steps:
testing an impedance curve of the inductor L, and determining a resonance peak value and frequency of the inductor L;
impedance fitting is carried out on the inductance L by using the RLC parallel network, and parameters of components in the RLC parallel network are determined according to the resonant frequency F and the resonant peak value;
and (3) testing an impedance curve of the RLC parallel network, comparing the impedance curve with an impedance curve of the inductor L, and finely adjusting component parameter values according to the curve until the RLC parallel network can be well fitted with the inductor L, namely, current fluctuation generated by the inductor network is identical in amplitude and opposite in phase to current fluctuation of an alternating current component of the inductor L.
The resonant frequency formula F is:
（7）；
wherein L represents inductance value and C represents capacitance value.
As shown in fig. 4, the RLC parallel network fits the inductance L well at frequencies higher than the switching frequency. Moreover, since the voltages generated on the inductor L and the fitting inductor network ZL have the same amplitude and opposite phases, it can be known that the current fluctuation generated on the inductor L of the power loop can generate the current fluctuation with the same amplitude and opposite phases on the fitting inductor network ZL, the current isolates the direct current component through the capacitor C1, only the alternating current component is left, and the component can be accurately offset with the current of the power loop, so that the elimination of the output current ripple can be realized.
As shown in fig. 5, the upper graph in the figure is the power loop current and the lower graph is the active filter loop compensation current. The two graphs are time on the abscissa, in seconds, current on the ordinate, amperes, and waveforms in the same time range, and can be compared. The power current ripple and the compensation current have almost the same waveforms except the reverse direction, which shows that the compensation current of the active filter circuit can better compensate the current ripple in the power circuit reversely, and better ripple eliminating effect is achieved.
As shown in fig. 6, the upper part of the graph shows the output current without the active filter circuit, and the lower part shows the output current with the active filter circuit. The abscissa of the two figures is time in seconds, the ordinate is current in amperes, and the waveforms are in the same time range. As can be seen from fig. 6, after the compensation of the ripple current by the active filtering loop of the present invention, the current ripple with the amplitude close to 0.2A before filtering is almost completely attenuated, and the filtering effect is significant. It should be noted that, since the simulation considers that the circuit operation state is too ideal and has a difference from the actual situation, there may be some difference between the actual effect and the simulation.
The foregoing is only a preferred embodiment of the invention, and it will be appreciated by those skilled in the art that various changes in the features and embodiments may be made and equivalents may be substituted without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The mirror-image-conducted symmetrical BUCK active filter converter is characterized by comprising a power loop and a filter loop which are connected with each other; the power loop comprises an inductor L, a first switching tube S1 and a second switching tube S2 which are connected in series; the filter circuit comprises a capacitor C1, a fitting inductance network ZL, a third switching tube S3 and a fourth switching tube S4 which are connected in series;
the inductor L, the capacitor C1 and the fitting inductor network ZL are connected in series, one end of the inductor L is connected between the first switching tube S1 and the second switching tube S2, one end of the fitting inductor network ZL is connected between the third switching tube S3 and the fourth switching tube S4, and both ends of the first switching tube S1 and the second switching tube S2 which are connected in series and both ends of the third switching tube S3 and the fourth switching tube S4 which are connected in series are connected with the positive electrode and the negative electrode of an input power supply Vin;
when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are in mirror conduction, the current fluctuation generated by the fitting inductance network ZL is identical in amplitude and opposite in phase to the current fluctuation generated by the inductance L, the generated current fluctuation isolates a direct current component through the capacitor C1, and the obtained alternating current component can offset the alternating current component corresponding to the inductance L.
2. The mirror-turned-on symmetrical BUCK active filter converter according to claim 1, wherein the first switching tube S1 and the second switching tube S2 are not turned on at the same time when the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 are turned on in mirror images.
3. The mirror-turned-on symmetrical BUCK active filter converter according to claim 2, wherein when the first switching tube S1, the second switching tube S2, the third switching tube S3, and the fourth switching tube S4 are turned on in mirror, the third switching tube S3 and the fourth switching tube S4 are not turned on at the same time.
4. The mirror-on symmetrical BUCK active filter converter according to claim 1, wherein when the first, second, third and fourth switching tubes S1, S2, S3, S4 are mirror-on, the current of the filter loop flows through the fourth switching tube S4 when the power loop current flows through the first switching tube S1.
5. The mirror-on symmetrical BUCK active filter converter according to claim 1, wherein when the first, second, third and fourth switching tubes S1, S2, S3, S4 are mirror-on, the current of the filter loop flows through the third switching tube S3 when the power loop current flows through the second switching tube S2.
6. The mirror-on symmetrical BUCK active filter converter according to claim 1, further including a load resistor Rload having one end connected between the capacitor C1 and the inductor L and the other end connected to the input power source Vin.
7. The mirror-on symmetrical BUCK active filter converter according to claim 6, further including an output capacitor C0, wherein one end of the output capacitor C0 is connected between the capacitor C1 and the inductor L, and the other end is connected to one end of the load resistor Rload.
8. The mirror-on symmetrical BUCK active filter converter according to claim 7, wherein the loop formed by the input power Vin, the third switching tube S3, the fourth switching tube S4, the fitted inductance network ZL, the capacitor C1, the output capacitor C0, and the load resistor Rload forms a symmetrical loop with the loop formed by the input power Vin, the first switching tube S1, the second switching tube S2, the inductor L, the output capacitor C0, and the load resistor Rload.
9. The mirror-on symmetrical BUCK active filter converter according to any of claims 1-8, wherein seven successive moments are provided in a switching cycle, the first switching tube S1 being on and the third switching tube S3 being off at a first moment; the fourth switching tube S4 is conducted at the second moment; at the fourth moment, the first switching tube S1 and the fourth switching tube S4 are turned off simultaneously; the second switching tube S2 and the third switching tube S3 are simultaneously conducted at the fifth moment; at the seventh moment, the second switching tube S2 is turned off.
10. The mirror-on symmetrical BUCK active filter converter according to any of claims 1 to 8, wherein an RLC parallel network is used as the fitted inductance network ZL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311576749.6A CN117294125A (en) | 2023-11-24 | 2023-11-24 | Mirror-image-conducted symmetrical BUCK active filter converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311576749.6A CN117294125A (en) | 2023-11-24 | 2023-11-24 | Mirror-image-conducted symmetrical BUCK active filter converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117294125A true CN117294125A (en) | 2023-12-26 |
Family
ID=89257478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311576749.6A Pending CN117294125A (en) | 2023-11-24 | 2023-11-24 | Mirror-image-conducted symmetrical BUCK active filter converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117294125A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5929692A (en) * | 1997-07-11 | 1999-07-27 | Computer Products Inc. | Ripple cancellation circuit with fast load response for switch mode voltage regulators with synchronous rectification |
| CN1967997A (en) * | 2006-10-20 | 2007-05-23 | 南京航空航天大学 | Five-level double step-down full bridge inverter |
| EP1962413A1 (en) * | 2007-02-22 | 2008-08-27 | Stmicroelectronics SA | Ripple compensator and switching converter comprising such a ripple compensator |
| US20100148743A1 (en) * | 2007-03-13 | 2010-06-17 | Jean-Philippe Martin | Active filtering device for a power supply |
| CN104205605A (en) * | 2012-03-26 | 2014-12-10 | 株式会社村田制作所 | Inverter device |
| CN105811790A (en) * | 2016-05-17 | 2016-07-27 | 中车株洲电力机车研究所有限公司 | Traction power electronic transformer system |
| CN106374741A (en) * | 2016-11-04 | 2017-02-01 | 南京航空航天大学 | Ripple cancellation-based inductance DC-DC converter output ripple elimination technology |
| EP3142237A1 (en) * | 2015-05-05 | 2017-03-15 | Schneider Electric IT Corporation | Series active ripple filter |
| CN109921626A (en) * | 2019-04-18 | 2019-06-21 | 珠海格力电器股份有限公司 | Power factor correction circuit and its control method, power factor correcting device |
| CN116827099A (en) * | 2023-06-26 | 2023-09-29 | 电子科技大学(深圳)高等研究院 | DC-DC converter ripple wave eliminating method based on current offset |
-
2023
- 2023-11-24 CN CN202311576749.6A patent/CN117294125A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5929692A (en) * | 1997-07-11 | 1999-07-27 | Computer Products Inc. | Ripple cancellation circuit with fast load response for switch mode voltage regulators with synchronous rectification |
| CN1967997A (en) * | 2006-10-20 | 2007-05-23 | 南京航空航天大学 | Five-level double step-down full bridge inverter |
| EP1962413A1 (en) * | 2007-02-22 | 2008-08-27 | Stmicroelectronics SA | Ripple compensator and switching converter comprising such a ripple compensator |
| US20100148743A1 (en) * | 2007-03-13 | 2010-06-17 | Jean-Philippe Martin | Active filtering device for a power supply |
| CN104205605A (en) * | 2012-03-26 | 2014-12-10 | 株式会社村田制作所 | Inverter device |
| EP3142237A1 (en) * | 2015-05-05 | 2017-03-15 | Schneider Electric IT Corporation | Series active ripple filter |
| CN105811790A (en) * | 2016-05-17 | 2016-07-27 | 中车株洲电力机车研究所有限公司 | Traction power electronic transformer system |
| CN106374741A (en) * | 2016-11-04 | 2017-02-01 | 南京航空航天大学 | Ripple cancellation-based inductance DC-DC converter output ripple elimination technology |
| CN109921626A (en) * | 2019-04-18 | 2019-06-21 | 珠海格力电器股份有限公司 | Power factor correction circuit and its control method, power factor correcting device |
| CN116827099A (en) * | 2023-06-26 | 2023-09-29 | 电子科技大学(深圳)高等研究院 | DC-DC converter ripple wave eliminating method based on current offset |
Non-Patent Citations (1)
| Title |
|---|
| 林志贵，王宜怀: "数字信号控制器原理与实践 基于MC56F8257", 31 January 2014, 北京航空航天大学出版社, pages: 144 - 147 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7218534B2 (en) | Switching power supply circuit | |
| CN111464026B (en) | Control circuit and switching converter using same | |
| US20120033451A1 (en) | Converter | |
| US11139734B2 (en) | DC/DC power converter | |
| CN114499146B (en) | Closed loop soft start control system suitable for resonant converter | |
| CN112928925B (en) | Active clamping flyback converter and implementation method thereof | |
| JP2004242491A (en) | Switching power supply circuit | |
| CN109546851B (en) | Soft switch high power factor AC-DC converter | |
| CN114884363B (en) | Double LLC resonant converter with six-time gain ratio and control method thereof | |
| CN117294125A (en) | Mirror-image-conducted symmetrical BUCK active filter converter | |
| CN109217699B (en) | Soft-switching high-power-factor alternating current-direct current converter | |
| Kurokawa et al. | A new fast digital PID control LLC resonant converter | |
| CN111277137A (en) | DCDC converter | |
| Ryu et al. | A new piezoelectric transformer driving topology for universal input AC/DC adapter using a constant frequency PWM control | |
| CN115333359B (en) | Boosting method of pulse overlap time modulation resonant switch capacitor PFC converter | |
| CN214315055U (en) | High-voltage stabilized power supply control device of electron beam welding machine | |
| RU205720U1 (en) | Resonant voltage converter | |
| JP5914984B2 (en) | DC converter | |
| KR20170104434A (en) | Resonance-type dc-dc converter | |
| JP3326660B2 (en) | Switching power supply circuit | |
| JP2007074779A (en) | Switching power supply circuit | |
| JP2007166806A (en) | Switching power supply circuit | |
| CN112737372A (en) | Melt-blown fabric electret power supply based on full-control rectifier bridge and half-bridge LLC resonant circuit | |
| Mao et al. | IGBT and GaN Hybrid Half-Bridge Applications Based on Multi-Sampling Technology Considering Cost, Efficiency and Transient Performance | |
| CN112953206A (en) | High-voltage stabilized power supply control device and method for electron beam welding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |