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
- switching power
- output
- output 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.)
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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
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 present invention relates to DC_DC switch power technologies field, more particularly to a kind of output current ripple suppression circuit.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio that controlling switch pipe is turned on and off, and remains steady
Determine a kind of power supply of output voltage.Switching Power Supply is compared with linear power supply, and ripple factor is generally larger.But ripple factor
It is an important indicator of Switching Power Supply again, if ripple is big, the normal work that Switching Power Supply will be affected to load can be brought and put
The problems such as big device noise, electromagnetic interference (EMI) noise.
The outfan of generally DC_DC Switching Power Supplies will add LC filter circuits, to suppress output ripple.Power switch device
Part is operated on off state so as to which the voltage at output inductor two ends can produce periodically pulsing, and the change of inductive drop makes
The electric current for flowing through inductance changes, and the fluctuation of electric current has current ripples in having resulted in circuit.
To reduce the output ripple electric current of DC_DC Switching Power Supplies, conventional suppressing method can increase the electricity of LC filter circuits
Sense and electric capacity.This kind of method is effective within the specific limits, but can not fundamentally suppress ripple current, and Practical Project
In can not unlimited increasing inductance value and capacitance.
Another kind of conventional output current ripple suppressing method is the switching frequency for improving Switching Power Supply, to improve LC filtering
The low-pass filter effect of circuit.This kind of method has the restriction of use range, because the raising of switching frequency can be subject to Switching Power Supply
The restriction of controller.
Another kind of method is to adopt two stage filter, i.e., add one-level LC filter circuit again in DC_DC switched power outputs.
All there is DC impedance in any inductance, be re-introduced into one-level LC filter circuit, necessarily increase energy loss, reduce the efficiency of power supply,
If two-stage LC filter circuit is all introduced in the closed control loop of DC_DC Switching Power Supplies, it is possible to closed loop system can be caused simultaneously
That what is united is unstable.
Still an alternative is that in DC_DC switched power outputs addition low pressure difference linear voltage regulator (LDO).The method
Output current ripple inhibition is fine, but high cost, and power consumption is high, and the LDO of high current is sufficiently bulky.
Thus, it is desirable to have a kind of technical scheme come overcome or at least mitigate prior art at least one drawbacks described above.
The content of the invention
It is an object of the invention to provide a kind of output current ripple suppression circuit is overcoming or at least mitigate prior art
At least one drawbacks described above.
For achieving the above object, the present invention provides a kind of output current ripple suppression circuit, for DC_DC switch power supplies
Road, the output current ripple suppression circuit include sensor circuit, ripple cancellation circuit and block isolating circuit；The sensor circuit
Former limit Same Name of Ends is connected to the input of the output inductor of DC_DC switching power circuits as input；The faradism
Road secondary Same Name of Ends is connected to the outfan of block isolating circuit as input；The sensor circuit former limit non-same polarity is used as output
End is connected to the outfan of the output inductor of DC_DC switching power circuits；The sensor circuit secondary non-same polarity conduct
Outfan is connected to the input of ripple cancellation circuit；The input of the block isolating circuit is connected to DC_DC switching power circuits
Negative electrode；The outfan of the ripple cancellation circuit is connected to the anode of DC_DC switching power circuits；Wherein, the faradism
Road is used for the ripple voltage at the two ends for inducing output inductor in DC_DC switching power circuits；Ripple cancellation circuit is used for
The phase place of the electric current that adjustment is induced from the sensor circuit；The block isolating circuit is used to isolate the DC_DC switch power supplies
DC current in road.
Preferably, the sensor circuit includes the first transformator.
Preferably, the ripple circuit includes the first inductance.
Preferably, the block isolating circuit includes the first electric capacity.
The output current ripple suppression circuit of the application can be by the AC compounent pair in the output current of DC_DC Switching Power Supplies
Disappear, so as to obtain good Ripple Suppression effect, and the application also has number of elements few, low cost, efficiency high, volume
Little the features such as.
Description of the drawings
Fig. 1 is the system schematic of the output current ripple suppression circuit of the application first embodiment.
Fig. 2 is the circuit diagram of the output current ripple suppression circuit shown in Fig. 1.
Reference：
| 1 | Sensor circuit | 3 | Block isolating circuit |
| 2 | Ripple cancellation circuit |
Specific embodiment
To make purpose, technical scheme and the advantage of present invention enforcement clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from start to finish or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
A part of embodiment, rather than the embodiment of whole.It is exemplary below with reference to the embodiment of Description of Drawings, it is intended to use
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment obtained under the premise of creative work is not made by member, belongs to the scope of protection of the invention.Under
Face combines accompanying drawing and embodiments of the invention is described in detail.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward " is based on accompanying drawing institute
The orientation for showing or position relationship, are for only for ease of the description present invention and simplify description, rather than indicate or imply the dress of indication
Put or element with specific orientation, with specific azimuth configuration and operation, therefore it is not intended that must be protected to the present invention
The restriction of scope.
Fig. 1 is the system schematic of the output current ripple suppression circuit of the application first embodiment.Fig. 2 is shown in Fig. 1
Output current ripple suppression circuit circuit diagram.
Output current ripple suppression circuit as shown in Figure 1, for DC_DC switching power circuits, the output current ripple
Suppression circuit includes sensor circuit 1, ripple cancellation circuit 2 and block isolating circuit 3；Sensor circuit former limit Same Name of Ends is used as input
It is connected to the input of the output inductor of DC_DC switching power circuits；Sensor circuit secondary Same Name of Ends connects as input
It is connected to the outfan of block isolating circuit；Sensor circuit former limit non-same polarity is connected to DC_DC switching power circuits as outfan
The outfan of output inductor；Sensor circuit secondary non-same polarity is connected to the input of ripple cancellation circuit as outfan
End；The input of block isolating circuit 3 is connected to the negative electrode of DC_DC switching power circuits；The outfan of ripple cancellation circuit 2 is connected to
The anode of DC_DC switching power circuits；Wherein, sensor circuit 1 exports filtered electrical in being used to induce DC_DC switching power circuits
The ripple voltage at the two ends of sense；Ripple cancellation circuit 2 is used for the phase place for adjusting the electric current that self induction circuit inductance goes out；Block isolating circuit
3 are used for the DC current isolated in DC_DC switching power circuits.
The output current ripple suppression circuit of the application can be by the AC compounent pair in the output current of DC_DC Switching Power Supplies
Disappear, so as to obtain good Ripple Suppression effect, and the application also has number of elements few, low cost, efficiency high, volume
Little the features such as.
In the present embodiment, the sensor circuit includes the first transformator.
In the present embodiment, the ripple circuit includes the first inductance.
In the present embodiment, the block isolating circuit includes the first electric capacity.
Principle elaboration is carried out to the application by way of example below, it is to be understood that this illustrates
Any restriction of the application.
Referring to Fig. 2, the operation principle of embodiment of the present invention ripple suppression circuit is：
The turn ratio is 1: N transformator T1By L2Ripple voltage be sensed as lower voltage Vsec.Block capacitor C1Electricity
The output voltage V of pressure and Switching Power SupplyoutIt is identical, therefore the only alternating voltage V of sensingsecIt is applied to inducer L1On.From
Inducer L1The ripple current of amendment is produced, so as to accurately eliminate through L2Electric current and transformator once winding current i3In
Ripple current.Flow through the electric current i of Transformer WindingL1+i3Polarity and filter inductor electric current iL2Middle alternating component amplitude is identical,
Opposite in phase.Circuit total current (iL1+iL2+i3) with iL2Original direct-current component, but the AC compounent of output current
But it is zero.Therefore, sensor circuit, ripple cancellation circuit and block isolating circuit (transformator T are set up1, inducer L1Only transmit very
The block capacitor C of few alternating current1) the output ripple electric current of DC_DC Switching Power Supplies can be eliminated.
For the quantitative analyses of each the variable in circuit, the relation between each current component meets following relational expression：
Zero ripple output condition be：
(1) formula is substituted into into (2) formula, can be obtained
In general, N has two solutions.Two kinds of turn ratioes can eliminate ripple current.
Work as L2L when given with N1Only one of which solution.
L1=L2·N·(1-N) (5)
The key parameter that ripple current is offseted is suitably selection inducer L1.Due to L1Must be positive, therefore with formula (6)
To limit the selection of turn ratio N.
0<N<1 (6)
L1And L2When given, the N in formula (4) has two solutions, two solutions and be just always 1.For example, if N wherein
One solution is 0.3, then another solution must be 0.7.Two for N solve, and less value in two values is usually used.N values
Less, in Fig. 2 electric current iL1And iL3(see formula (7)) can be less, reduces the I in ripple current cancellation circuit2R is lost.It is less
N values, make electric current iL2And i3It is less, reduce blocking capacitor C1Ripple voltage, as a result the operation of circuit is more preferable.N
Value more hour, inducer L1Volume is less.
Electric current i in Fig. 2L2It is power inverter output inductor electric current, including DC electric current component and AC current components.
Hypothesis has little output voltage ripple, no matter either with or without using ripple current cancellation circuit, electric current iL2It is identical.Ripple
Electric current cancellation circuit is produced and can accurately eliminate iL2AC components electric current, DC electric current component is unaffected.
Block capacitor C1With inducer L1The position of the limit for being formed have to be lower than power inverter ripple frequency
fRipple.Or ripple frequency is changer conversion frequency, or being the twice of changer conversion frequency, this depends on topology knot
Structure.Pole frequency is higher than closed power bandwidth fPwr-BW(or 0dB intersects) is more satisfactory.Preferably starting point is changer
The geometrical mean of 0dB power bandwidths crossover point and changer ripple frequency.By thus according to turn ratio N and output induction apparatuss L2
The L of selection1, therefore capacitor C1Ideal value be
Embodiment of the present invention output current ripple suppression circuit is completely eliminated the output ripple of DC_DC Switching Power Supplies, unit
Part is few, and circuit is simple, is practically applicable to the various DC_DC Switching Power Supply application scenarios high to power quality requirements.
It is understood that the annexation of sensor circuit, ripple cancellation circuit and block isolating circuit can be as needed
And change.For example, change the order of connection that the first transformator T1 secondary, block capacitor, ripple offset inducer.Without departing from
On the premise of the principle of the invention, any modification, equivalent substitute and the improvement made should be included in the claim of the present invention
Within the scope of.
It is last it is to be noted that：Above example only to illustrate technical scheme, rather than a limitation.To the greatest extent
Pipe has been described in detail to the present invention with reference to the foregoing embodiments, it will be understood by those within the art that：Which is still
Technical scheme described in foregoing embodiments can be modified, or equivalent is carried out to which part technical characteristic and replace
Change；And these modifications or replacement, do not make the essence of appropriate technical solution depart from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (4)
1. a kind of output current ripple suppression circuit, for DC_DC switching power circuits, it is characterised in that the output current
Ripple suppression circuit includes sensor circuit (1), ripple cancellation circuit (2) and block isolating circuit (3)；
The sensor circuit former limit Same Name of Ends is connected to the defeated of the output inductor of DC_DC switching power circuits as input
Enter end；
The sensor circuit secondary Same Name of Ends is connected to the outfan of block isolating circuit as input；
The sensor circuit former limit non-same polarity is connected to the output inductor of DC_DC switching power circuits as outfan
Outfan；
The sensor circuit secondary non-same polarity is connected to the input of ripple cancellation circuit as outfan；
The input of the block isolating circuit (3) is connected to the negative electrode of DC_DC switching power circuits；
The outfan of the ripple cancellation circuit (2) is connected to the anode of DC_DC switching power circuits；
Wherein,
The sensor circuit (1) is for inducing the ripple voltage at the two ends of output inductor in DC_DC switching power circuits；
The phase place of the electric current that ripple cancellation circuit (2) is induced from the sensor circuit for adjustment；
The block isolating circuit (3) is for isolating the DC current in the DC_DC switching power circuits.
2. output current ripple suppression circuit as claimed in claim 1, it is characterised in that the sensor circuit includes the first change
Depressor.
3. output current ripple suppression circuit as claimed in claim 1, it is characterised in that the ripple circuit includes that first is electric
Sense.
4. output current ripple suppression circuit as claimed in claim 1, it is characterised in that the block isolating circuit includes that first is electric
Hold.
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 |
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| 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 |
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Application publication date: 20170322 |
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