CN106533158A - Ripple suppression circuit of output current - Google Patents
Ripple suppression circuit of output current Download PDFInfo
- Publication number
- CN106533158A CN106533158A CN201611185702.7A CN201611185702A CN106533158A CN 106533158 A CN106533158 A CN 106533158A CN 201611185702 A CN201611185702 A CN 201611185702A CN 106533158 A CN106533158 A CN 106533158A
- Authority
- CN
- China
- Prior art keywords
- circuit
- ripple
- power supply
- output
- switching power
- 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
- 230000001629 suppression Effects 0.000 title claims abstract description 30
- 230000000903 blocking effect Effects 0.000 claims abstract description 26
- 230000001939 inductive effect Effects 0.000 claims abstract description 11
- 230000006698 induction Effects 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a ripple suppression circuit of output current. The ripple suppression circuit of the output current comprises an inductive circuit, a ripple cancellation circuit and a blocking circuit, wherein a primary-side dotted terminal of the inductive circuit is connected to an input end of an output filter inductor of a DC-DC switching power supply circuit as the input end; a secondary-side dotted terminal of the inductive circuit is connected to an output end of the blocking circuit as the input end; a primary-side non-dotted terminal of the inductive circuit is connected to the output end of the output filter inductor of the DC-DC switching power supply circuit as the output end; a secondary-side non-dotted terminal of the inductive circuit is connected to the input end of the ripple cancellation circuit as the output end; the input end of the blocking circuit is connected to a cathode of the DC-DC switching power supply circuit; and the output end of the ripple cancellation circuit is connected to an anode of the DC-DC switching power supply circuit. According to the ripple suppression circuit of the output current disclosed by the invention, an AC component in the output current of a DC-DC switching power supply can be cancelled to obtain a good ripple suppression effect; and the ripple suppression circuit also has the advantages of few components, low cost, high efficiency and small volume.
Description
Technical Field
The invention relates to the technical field of DC-DC switching power supplies, in particular to an output current ripple suppression circuit.
Background
The switch power supply is a power supply which utilizes the modern power electronic technology to control the on-off time ratio of a switch tube and maintain stable output voltage. The ripple factor of a switching power supply is typically larger than that of a linear power supply. However, the ripple factor is an important index of the switching power supply, and if the ripple is large, the normal operation of the load of the switching power supply is affected, and problems such as amplifier noise and electromagnetic interference (EMI) noise are caused.
Usually, an LC filter circuit is added to the output terminal of the DC _ DC switching power supply to suppress output ripple. The power switch device works in a switch state, so that the voltage at two ends of the output filter inductor can generate periodic pulsation, the current flowing through the inductor is changed due to the change of the voltage of the inductor, and the current ripple exists in a circuit due to the fluctuation of the current.
In order to reduce the output ripple current of the DC _ DC switching power supply, the inductance and capacitance of the LC filter circuit can be increased by a conventional suppression method. This method is effective in a certain range, but cannot suppress ripple current fundamentally, and cannot increase the inductance and capacitance values without limit in practical engineering.
Another common method for suppressing output current ripple is to increase the switching frequency of the switching power supply to improve the low-pass filtering effect of the LC filter circuit. This approach has a limited range of use because the increase in switching frequency is limited by the switching power supply controller.
The other method is to adopt two-stage filtering, namely adding a stage of LC filtering circuit at the output end of the DC _ DC switching power supply. Any inductor has direct-current impedance, and the introduction of the first-stage LC filter circuit inevitably increases energy consumption and reduces the efficiency of the power supply, and meanwhile, if the two-stage LC filter circuit is introduced into a closed-loop control loop of the DC _ DC switching power supply, the instability of a closed-loop system can be possibly caused.
Yet another approach is to add a low dropout linear regulator (LDO) at the output of the DC _ DC switching power supply. The output current ripple suppression effect of the method is good, but the cost is high, the power consumption is high, and the LDO with large current has large volume.
Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
It is an object of the present invention to provide an output current ripple suppression circuit that overcomes or at least mitigates at least one of the above-mentioned disadvantages of the prior art.
In order to achieve the above object, the present invention provides an output current ripple suppression circuit for a DC _ DC switching power supply circuit, wherein the output current ripple suppression circuit includes an induction circuit, a ripple cancellation circuit, and a DC blocking circuit; the primary-side dotted terminal of the induction circuit is used as an input terminal and is connected to the input terminal of an output filter inductor of the DC _ DC switching power supply circuit; the homonymous end of the secondary side of the induction circuit is used as an input end and connected to the output end of the blocking circuit; the non-homonymous end of the primary side of the induction circuit is used as an output end and is connected to the output end of an output filter inductor of the DC _ DC switching power supply circuit; the non-homonymous end of the secondary side of the induction circuit is used as an output end and is connected to the input end of the ripple cancellation circuit; the input end of the blocking circuit is connected to the cathode of the DC _ DC switching power supply circuit; the output end of the ripple cancellation circuit is connected to the anode of the DC _ DC switching power supply circuit; the induction circuit is used for inducing ripple voltage at two ends of an output filter inductor in the DC _ DC switching power supply circuit; the ripple cancellation circuit is used for adjusting the phase of the current induced by the induction circuit; the DC blocking circuit is used for isolating the direct current in the DC _ DC switching power supply circuit.
Preferably, the inductive circuit comprises a first transformer.
Preferably, the ripple circuit includes a first inductance.
Preferably, the dc blocking circuit comprises a first capacitor.
The output current ripple suppression circuit can cancel the alternating current component in the output current of the DC _ DC switching power supply, so that a good ripple suppression effect is obtained, and the output current ripple suppression circuit further has the characteristics of small number of elements, low cost, high efficiency, small size and the like.
Drawings
Fig. 1 is a system diagram of an output current ripple suppression circuit according to a first embodiment of the present application.
Fig. 2 is a circuit schematic diagram of the output current ripple suppression circuit shown in fig. 1.
Reference numerals:
| 1 | induction circuit | 3 | DC blocking circuit |
| 2 | Ripple cancellation circuit |
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. 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 invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Fig. 1 is a system diagram of an output current ripple suppression circuit according to a first embodiment of the present application. Fig. 2 is a circuit schematic diagram of the output current ripple suppression circuit shown in fig. 1.
The output current ripple suppression circuit shown in fig. 1 is used for a DC _ DC switching power supply circuit, and includes an induction circuit 1, a ripple cancellation circuit 2, and a DC blocking circuit 3; the primary-side dotted terminal of the induction circuit is used as an input terminal and is connected to the input terminal of an output filter inductor of the DC _ DC switching power supply circuit; the homonymous end of the secondary side of the induction circuit is used as an input end and connected to the output end of the blocking circuit; the non-homonymous end of the primary side of the induction circuit is used as an output end and is connected to the output end of an output filter inductor of the DC _ DC switching power supply circuit; the non-homonymous end of the secondary side of the induction circuit is used as an output end and is connected to the input end of the ripple cancellation circuit; the input end of the blocking circuit 3 is connected to the cathode of the DC _ DC switching power supply circuit; the output end of the ripple cancellation circuit 2 is connected to the anode of the DC _ DC switching power supply circuit; the induction circuit 1 is used for inducing ripple voltage at two ends of an output filter inductor in the DC _ DC switching power supply circuit; the ripple cancellation circuit 2 is used for adjusting the phase of the current induced by the self-induction circuit; the DC blocking circuit 3 is used to isolate the DC current in the DC _ DC switching power supply circuit.
The output current ripple suppression circuit can cancel the alternating current component in the output current of the DC _ DC switching power supply, so that a good ripple suppression effect is obtained, and the output current ripple suppression circuit further has the characteristics of small number of elements, low cost, high efficiency, small size and the like.
In this embodiment, the inductive circuit includes a first transformer.
In this embodiment, the ripple circuit includes a first inductor.
In this embodiment, the dc blocking circuit includes a first capacitor.
The present application is hereinafter schematically illustrated by way of example, and it is to be understood that this illustration is not to be construed as limiting the present application in any way.
Referring to fig. 2, the operating principle of the ripple suppression circuit according to the embodiment of the present invention is as follows:
transformer T with 1: N turn ratio1Mixing L with2Is induced to a lower voltage Vsec. Blocking capacitor C1Voltage of and output voltage V of the switching power supplyoutSame, and therefore only the induced AC voltage VsecIs applied to an inductor L1The above. Optional inductor L1Generating a corrected ripple current to accurately cancel the ripple current passing through L2Current of and transformer primary winding current i3The ripple current in the capacitor. Current i flowing through the transformer windingL1+i3Polarity and filter inductor current iL2Middle crossingThe flow components are of the same amplitude and opposite phase. Total current (i) of the circuitL1+iL2+i3) Having iL2But the ac component of the output current is zero. Therefore, an induction circuit, a ripple cancellation circuit and a DC blocking circuit (transformer T) are added1Inductor L1And a blocking capacitor C for transmitting only a small amount of AC current1) The output ripple current of the DC _ DC switching power supply can be eliminated.
For quantitative analysis of the variables of each of the individual circuits, the relationship between the individual current components satisfies the following relationship:
the conditions for zero ripple output are:
substituting the formula (1) into the formula (2) to obtain
Generally, there are two solutions to N. Both turns ratios eliminate ripple current.
When L is2And N is given by the time L1There is only one solution.
L1＝L2·N·(1-N) (5)
The key parameter for the cancellation of ripple current is the proper selection of the inductor L1. Due to L1Must be positiveEquation (6) is therefore used to limit the choice of the turns ratio N.
0<N<1 (6)
L1And L2Given that there are two solutions to N in equation (4), the sum of the two solutions is always exactly 1. For example, if one of the solutions for N is 0.3, then the other solution must be 0.7. For both solutions of N, the smaller of the two values is typically used. Smaller value of N, current i in FIG. 2L1And iL3(see equation (7)) will be smaller, reducing I in the ripple current cancellation circuit2And R is lost. Smaller value of N, making current iL2And i3Smaller, reduces the DC blocking capacitor C1The ripple voltage of the circuit, as a result, the operation of the circuit is more desirable. Inductor L with smaller value of N1The volume is smaller.
Current i in fig. 2L2Is the power converter output filter inductor current, including a DC current component and an AC current component. Assuming a small output voltage ripple, current i, regardless of whether a ripple current cancellation circuit is employed or notL2Are identical. Ripple current cancellation circuit generation can accurately cancel iL2The DC current component is not affected.
Blocking capacitor C1And an inductor L1The pole formed must be located below the power converter ripple frequency fRipple. The ripple frequency is either the converter switching frequency or twice the converter switching frequency, depending on the topology. Pole frequency higher than closed loop power bandwidth fPwr-BW(or 0dB crossover) is desirable. The ideal starting point is the geometric mean of the converter 0dB power bandwidth crossover point and the converter ripple frequency. Because the output inductor L is based on the turn ratio N2Selected L1Thus, capacitor C1Is ideally the value of
The output current ripple suppression circuit of the embodiment of the invention can completely eliminate the output ripple of the DC _ DC switching power supply, has few elements and simple circuit, and is suitable for various DC _ DC switching power supply application occasions with high requirements on the quality of the power supply.
It is understood that the connection relationship of the sensing circuit, the ripple cancellation circuit and the dc blocking circuit can be changed according to the requirement. For example, the connection sequence of the secondary side of the first transformer T1, the blocking capacitor and the ripple cancellation inductor is changed. Any modification, equivalent replacement and improvement made without departing from the principle of the present invention shall be included in the scope of the claims of the present invention.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. An output current ripple suppression circuit is used for a DC _ DC switching power supply circuit, and is characterized by comprising an induction circuit (1), a ripple cancellation circuit (2) and a DC blocking circuit (3);
the primary-side dotted terminal of the induction circuit is used as an input terminal and is connected to the input terminal of an output filter inductor of the DC _ DC switching power supply circuit;
the homonymous end of the secondary side of the induction circuit is used as an input end and connected to the output end of the blocking circuit;
the non-homonymous end of the primary side of the induction circuit is used as an output end and is connected to the output end of an output filter inductor of the DC _ DC switching power supply circuit;
the non-homonymous end of the secondary side of the induction circuit is used as an output end and is connected to the input end of the ripple cancellation circuit;
the input end of the direct current blocking circuit (3) is connected to the cathode of the DC _ DC switching power supply circuit;
the output end of the ripple cancellation circuit (2) is connected to the anode of the DC _ DC switching power supply circuit;
wherein,
the induction circuit (1) is used for inducing ripple voltage at two ends of an output filter inductor in the DC _ DC switching power supply circuit;
the ripple cancellation circuit (2) is used for adjusting the phase of the current induced by the induction circuit;
the DC blocking circuit (3) is used for isolating the direct current in the DC _ DC switching power supply circuit.
2. The output current ripple suppression circuit of claim 1, wherein the inductive circuit comprises a first transformer.
3. The output current ripple suppression circuit of claim 1, wherein the ripple circuit comprises a first inductor.
4. The output current ripple suppression circuit of claim 1, wherein the dc blocking circuit comprises a first capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185702.7A CN106533158A (en) | 2016-12-20 | 2016-12-20 | Ripple suppression circuit of output current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185702.7A CN106533158A (en) | 2016-12-20 | 2016-12-20 | Ripple suppression circuit of output current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106533158A true CN106533158A (en) | 2017-03-22 |
Family
ID=58341246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611185702.7A Pending CN106533158A (en) | 2016-12-20 | 2016-12-20 | Ripple suppression circuit of output current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106533158A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108460215A (en) * | 2018-03-09 | 2018-08-28 | 西安电子科技大学 | The method for quick predicting that front power supply ripple influences active phase array antenna electrical property |
| CN109884428A (en) * | 2019-02-22 | 2019-06-14 | 晶晨半导体(上海)股份有限公司 | A kind of method and test circuit for improving the stability of circuit system |
| CN117712820A (en) * | 2024-02-05 | 2024-03-15 | 成都光创联科技有限公司 | Driving circuit of laser linear power supply and laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050073863A1 (en) * | 2003-10-01 | 2005-04-07 | General Electric Company | Ripple-current reduction for transformers |
| CN101594068A (en) * | 2008-05-27 | 2009-12-02 | 通用电气公司 | Efficiently, multi-source photovoltaic inverter |
| CN103346666A (en) * | 2013-07-10 | 2013-10-09 | 深圳市航天新源科技有限公司 | Low ripple current output circuit |
| CN204258608U (en) * | 2014-09-01 | 2015-04-08 | 成都芯源系统有限公司 | Ripple suppression circuit and circuit system comprising same |
-
2016
- 2016-12-20 CN CN201611185702.7A patent/CN106533158A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050073863A1 (en) * | 2003-10-01 | 2005-04-07 | General Electric Company | Ripple-current reduction for transformers |
| CN101594068A (en) * | 2008-05-27 | 2009-12-02 | 通用电气公司 | Efficiently, multi-source photovoltaic inverter |
| CN103346666A (en) * | 2013-07-10 | 2013-10-09 | 深圳市航天新源科技有限公司 | Low ripple current output circuit |
| CN204258608U (en) * | 2014-09-01 | 2015-04-08 | 成都芯源系统有限公司 | Ripple suppression circuit and circuit system comprising same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108460215A (en) * | 2018-03-09 | 2018-08-28 | 西安电子科技大学 | The method for quick predicting that front power supply ripple influences active phase array antenna electrical property |
| CN108460215B (en) * | 2018-03-09 | 2020-05-05 | 西安电子科技大学 | Method for rapidly predicting influence of array surface power supply ripple on electrical property of active phased array antenna |
| CN109884428A (en) * | 2019-02-22 | 2019-06-14 | 晶晨半导体(上海)股份有限公司 | A kind of method and test circuit for improving the stability of circuit system |
| CN117712820A (en) * | 2024-02-05 | 2024-03-15 | 成都光创联科技有限公司 | Driving circuit of laser linear power supply and laser |
| CN117712820B (en) * | 2024-02-05 | 2024-04-19 | 成都光创联科技有限公司 | Driving circuit of laser linear power supply and laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019091393A1 (en) | Planar transformer, power source switching circuit and adapter | |
| US7218534B2 (en) | Switching power supply circuit | |
| US6807069B2 (en) | Direct current converter with integrated transformer windings and output voltage filtering coils on the same magnetic core | |
| US9690311B2 (en) | Power supply apparatus | |
| US8902613B2 (en) | Integrated converter with single-ended control, power factor correction, and low output ripple | |
| EP2779393A2 (en) | Bridgeless interleaved power factor correction circuit using a PFC inductor with quad-winding on a single core | |
| US9722499B2 (en) | Energy transfer element with capacitor compensated cancellation and balance shield windings | |
| US20170047848A1 (en) | Transformer, flyback converter and switching power supply with the same | |
| CN106533158A (en) | Ripple suppression circuit of output current | |
| US8379415B2 (en) | Systems and methods for reducing EMI in switch mode converter systems | |
| US5640310A (en) | Current resonance type switching power source | |
| US6867575B2 (en) | Switching mode power supply incorporating power line filter | |
| CN216599446U (en) | Transformer and power supply circuit | |
| CN209805666U (en) | Ripple suppression circuit | |
| US6731521B2 (en) | Switching power supply circuit | |
| CN112234824B (en) | DC/DC converter and communication power supply | |
| CN212231338U (en) | Intermediate-power multi-path voltage output open-loop half-bridge resonant circuit based on IR2153S | |
| CN112953198B (en) | Switching power supply controller and control method thereof | |
| CN204810143U (en) | Anti -electromagnetic interference switching power supply | |
| JP2006211855A (en) | Ac-dc converter | |
| JPH04127875A (en) | Power supply | |
| Yaskiv et al. | Performance evaluation of MagAmp regulated isolated AC-DC converter with high PF | |
| JPH06311749A (en) | Switching power supply apparatus | |
| CN118117859B (en) | Ripple cancellation circuit and circuit using the same | |
| CN220307098U (en) | Wireless power transfer secondary circuit and receiver circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170322 |
|
| WD01 | Invention patent application deemed withdrawn after publication |