CN1148860C - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN1148860C CN1148860C CNB021151563A CN02115156A CN1148860C CN 1148860 C CN1148860 C CN 1148860C CN B021151563 A CNB021151563 A CN B021151563A CN 02115156 A CN02115156 A CN 02115156A CN 1148860 C CN1148860 C CN 1148860C
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Abstract
The present invention discloses a switching power supply which comprises a forming circuit of switching signals, and an alternating current passing circuit, wherein the forming circuit of switching signals is used for forming alternating current or pulsatory current, wherein the forming circuit of switching signals comprises an alternating current component whose period is a switching period, namely switching ripple current; the alternating current passing circuit is used for attenuating or passing one or a plurality of specific frequency components in the switching ripple current; the circuit can be a single-stage circuit as well as a multistage circuit. The present invention is characterized in that the alternating current passing circuit comprises one or a plurality of series resonant branch circuits mutually connected in series, wherein each branch circuit is composed of a perceptual unit and a capacitive unit under a specific frequency, wherein at least one resonant frequency in at least one branch circuit connected in series corresponds to the ripple current of total switching ripple current or the frequency of the current with the maximal amplitude value in various frequency components of the switching ripple current passing a stage circuit. The present invention solves the heating problem of filtering or a coupling capacitor, reduces circuit volume, and reduces circuit cost.
Description
Technical field:
The present invention relates to a kind of Switching Power Supply, specifically, relate to filtering or coupling circuit in the Switching Power Supply.
Background technology:
In the prior art, need make a certain path blocking-up direct current and when AC signal was passed through, used device was an electric capacity, as output filter capacitor, coupling capacitance etc. in Switching Power Supply, also are like this.In output filter circuit, basic circuit is extensive use of the LC filter circuit, sees Fig. 1.The shortcoming of this basic LC filter circuit is, when the electric current of output circuit is big, the bigger electric capacity that needs, since with the cost of capacity high frequency capacitance, volume much larger than electrochemical capacitor, therefore generally pass through fundamental current or low-order harmonic electric current in the circuit of direct current output with electrochemical capacitor, and being mainly used to carry out high order harmonic component filter filter with high frequency capacitance, filter capacitor adopts bigger electrochemical capacitor high frequency capacitance in parallel like this.This has not only increased cost, the volume of filter circuit, and because first-harmonic and low-order harmonic electric current major part flow through electrochemical capacitor, causes the electrochemical capacitor heating, has reduced reliability.In the ac converter filter circuit, because unipolar electrochemical capacitor is inapplicable, need to adopt the ac capacitor of larger capacity, this also causes the volume of filter circuit to increase and cost improves.In the occasion that needs high-frequency coupling electric capacity, similar problem is arranged equally also.
Summary of the invention:
Purpose of the present invention is exactly will to use large bulk capacitance in order to solve existing filter circuit, and the cost height, volume is big and the serious problem of generating heat, and a kind of Switching Power Supply is provided.
For achieving the above object, the present invention proposes a kind of Switching Power Supply, contains switching signal formation circuit and passes through circuit with exchanging; Switching signal forms circuit and is used to form the electric current that exchanges or pulse, wherein include the switch ripple current, interchange is used for decaying by circuit or one or more characteristic frequency compositions by these switch ripple currents, it is characterized in that: exchange by circuit comprise one or more by mutual series connection the unit that under described characteristic frequency, is perception and be the series resonance branch road that the unit of capacitive is formed, wherein at least one resonance frequency at least one series resonance branch road is corresponding to the frequency of current amplitude maximum in the multiple radio-frequency component of switch ripple current that is input to this resonance branch road.
Owing to adopted above scheme, the present invention adopts series resonant circuit to present very low-impedance characteristic near resonance frequency, the resonance frequency of selecting series resonant circuit is the frequency of desire decay or the AC signal passed through, substitute or alternative original filtering or the coupling element of part with series resonant circuit, fully combine the resonance characteristic of series resonant circuit and the middle switching signal of Switching Power Supply and have periodic characteristics, because the frequency of Switching Power Supply is higher, the place of in original basic filter circuit, using big electrochemical capacitor and high frequency capacitance, only need to use the inductance and the electric capacity of low capacity now, suitable design even can all not use the electric capacity of polarity, saved circuit cost, reduced components and parts volume in the circuit, solve heating problem well, improved circuit reliability.
Description of drawings:
Fig. 1 is the basic LC filter circuit that uses in the prior art Switching Power Supply.
Fig. 2 is a kind of filter circuit schematic diagram that uses in the improved Switching Power Supply of the present invention.
Fig. 3 is the improved another kind of filter circuit of the present invention, and its a series resonance branch road has two series resonance frequencys.
Fig. 4 is improved another the filter circuit schematic diagram of the present invention.
Fig. 5 is the output filter circuit that the present invention is used for the BUCK circuit.
Fig. 6 is the output filter circuit that the present invention is used for the BOOST circuit.
Fig. 7 is the output filter circuit that the present invention is used for the BUCK-BOOST circuit.
Fig. 8 is output filtering and the coupling circuit that the present invention is used for the BOOST-BUCK circuit.
Fig. 9 is that the present invention is used for Switching Power Supply conversion front end DC side or alternating current input power supplying filter circuit.
Figure 10 is the output filter circuit that the present invention is used to export the Switching Power Supply of constant current
Figure 11 is the filter circuit that the present invention is used for the DCAC translation circuit
Figure 12 is that the present invention is used for the filter circuit that is used in combination with common mode inductance.
Figure 13 is the high-frequency coupling circuit that the present invention is used for circuit such as half-bridge, full-bridge, asymmetrical half-bridge.
Figure 14 adopts the filter circuit that perceptual electric capacity and capacitive capacitances in series form under the high frequency.
Embodiment:
The filter circuit principle that the present invention improves in the Switching Power Supply is seen Fig. 2, and the waveform of establishing input power supply IN is the periodic waveform that switch change-over forms, and its cycle can be fixed, and also certain variation can be arranged.Form the periodic current waveform in L1, electric current wherein is total switch ripple current.As the difference that causes the ripple current waveform that various duty ratios are fixed or changed, the difference of input waveform should not be construed as the restriction that the present invention is used.The present invention is that the periodicity alternating current of switch periods is called the switch ripple current with this cycle.To common design, in the single-stage or multi-stage filter circuit of output stage, all trying one's best decay flow into the switch ripple current of late-class circuit or final output, promptly makes the switch ripple current not flow to late-class circuit by a certain of circuit at the corresponding levels or some branch road as far as possible.Coupling circuit then all is delivered to late-class circuit with switch ripple circuit.Therefore, the present invention's electricity of allowing alternating current pass through hope such as filter circuit, ac-coupled circuit all is considered as exchanging and passes through circuit.In the prior art, by often adopting bigger electrochemical capacitor high frequency capacitance in parallel in the circuit of switch ripple current, in coupling circuit, then adopt bigger high frequency capacitance.
As shown in Figure 2, capacitor C 2 and inductance L 2 are composed in series resonance branch road 100, one termination common port COM, and an end of the other end and inductance L 1 links to each other, and the other end of L1 is connected in switching signal input INA, capacitor C 1 and 100 parallel connections of resonance branch road.
If switch ripple current (promptly flowing through the electric current of L1) is to be the periodic waveform of T in the cycle, the resonance frequency of L2C2 is the first-harmonic or the nth harmonic of periodic waveform, that is:
1/(2π(L2×C2)
1/2)＝n×(1/T).........................①
Wherein n is a positive integer
According to the basic principle of signal spectrum conversion, periodic waveform can be broken down into flip-flop and first-harmonic composition and all harmonic waves with, the waveform of establishing the switch ripple current is f (t), its cycle is T, angular frequency is w, the nth harmonic amplitude is Cn, has:
Cn=(An
2+ Bn
2)
1/2... ... ... .... 2. wherein: An=2/T ∫
TF (t) Cos (nwt) dt
Bn=2/T ∫
TF (t) Sin (nwt) dt is then: f (t)=C1 * Sin (wt+d1)+C2 * Sin (2 (wt+d2))+...+Cn * Sin (n (wt+dn)) .... (3.
Wherein: n=1,2,3..., d1, d2...dn are constants
In most Switching Power Supplies, the first-harmonic of ripple current and the amplitude of a few low-order harmonic are bigger, and other components are very little, and along with its amplitude of rising of harmonic number has quick downward trend.According to above-mentioned frequency-domain analysis to waveform as seen, can be with a few series resonant circuit (100), select L2, the value of C2, on the resonance frequency design frequency that a few amplitude is bigger in the switch ripple current with series resonance branch road 100, near because the impedance of series resonance branch road 100 when impedance is generally far below independent use capacitive unit or perceptual unisexuality resonance frequency, thereby resonance branch road 100 effects this moment are equivalent to than much bigger electric capacity of C2 or the inductance more much smaller than L2, ideally, the impedance of series resonance branch road 100 is 0, the switch ripple current of the overwhelming majority will flow through the series resonance branch road, thereby the electric current that flows through C1 reduces, capacity also can reduce, even can.
In a lot of Switching Power Supplies, first-harmonic composition amplitude maximum in the switch ripple current, and more much bigger than other radio-frequency components, in this case, only just can reach good effect with 1 series resonance branch road, Fig. 2 is exactly an example.INA is the periodic waveform that switch change-over forms, and form the switch ripple current in L1, and the series resonance frequency of series resonance branch road (100) is set on the first-harmonic centre frequency of described switch ripple current waveform.
Under the actual conditions, series resonant circuit 100 is not 0 in the impedance that is attenuated the frequency place, and it is relevant with deviation that is attenuated frequency and resonance frequency and L2C2 parameter.Deviation is more little, and impedance is low more.Series resonant circuit 100 still had better action when frequency departure was arranged.For example, be attenuated frequency at relevant with resonance frequency 5% o'clock, the series resonant circuit impedance be C2 condensance 1/10.
Series resonance branch road 100 can several in parallel uses.The resonance frequency of these branch roads can be at same frequency setting and near same value or same value, and when being attenuated frequency so certain variation being arranged, circuit all has than Low ESR.Also can set at different frequency, to a plurality of frequencies that are attenuated, circuit all has than Low ESR like this.
Obviously, series resonance branch road 100 can be in multiple-stage filtering not at the same level yet in many places use.
When certain reason changes the shape of switching waveform such as change in duty cycle or amplitude, its first-harmonic and the harmonic wave ratio in total current will change, but because frequency is constant, so series resonance branch road 100 still can play good filter action.
An advantage of filter circuit as shown in Figure 2 is all not use the electric capacity of polarity.Thereby it also can be used in the Switching Power Supply part or all of AC coupled path by switching signal, perhaps is used for the output filtering of DCAC conversion.
Fig. 4 circuit has been done improvement.On the basis of Fig. 2, increased L3 and be connected between resonance branch road (100) and the late-class circuit.It has such advantage: if select L3 to make itself and late-class circuit series connection back be attenuated impedance on the frequency greater than the impedance of resonance branch road 100, obviously major part is attenuated frequency current and will flows through resonance branch road (100).If electrochemical capacitor is connected in the circuit of L3 back, then will only flow through a spot of frequency current that is attenuated in the electrochemical capacitor, thereby the electrochemical capacitor capacity can reduce greatly.Because the Switching Power Supply frequency is higher, the numerical value of L2, C2, L3 is less, and generally, circuit cost is low, volume is little.
Compare with common filter circuit, Fig. 2, Fig. 4 circuit have another advantage, and it is very little to the influence of circuit low frequency characteristic when strengthening filtering performance to be exactly it, thereby also can be applied in the low frequency signal phase place is had in the requirement ac filter circuit; In addition, in the circuit of output of will aspiring for stability, because electric capacity can reduce, thereby make the resonance frequency that produces in the circuit multi-stage cascade higher easily, the circuit respective frequencies gain low, thereby it more helps the design of loop parameter, and traditional multiple filter, because filter capacitor is easy to generate the lower resonance point of a plurality of frequencies when increasing, and is unfavorable for the design of loop.
A kind of filter circuit of forward converter for example, it is input as the square wave that is approximately duty ratio 0.5, then electric current is a triangular wave in the inductance L 1, its fundamental current is 90% of the total effective value of switch ripple current approximately, do output filtering if adopt Fig. 2 circuit, selecting the resonance frequency of series resonance branch road (100) is fundamental frequency, ideally, 100 impedances of series resonance branch road are 0, the first-harmonic electric wave is all by this branch road, the signal that other frequencies of part are also arranged can make the electric current that flows through other electric capacity less than 10% of total current by this branch road like this.If switching frequency is 150KHZ, if using traditional filter circuit to need capacitance is 1000 μ F, when using series resonance branch road (100), a series resonance branch road that is about 1.126 μ H μ F with capacitor C 1 and the L2 * C2 of 100 μ F substitutes, and the effect that reduces volume and cost is fairly obvious.Do output filtering if adopt Fig. 4 circuit, suppose to get L2=0.563 μ H, C2=2 μ F, can get L3=1 μ H, electrochemical capacitor just can reach original filter effect below getting 100 μ F, and, the fundamental current major part flows through series resonance branch road (100), to harmonic frequency, because of the L2C2 impedance still less than L3 and late-class circuit series impedance, thereby the overwhelming majority the switch ripple all passed through series resonance branch road (100).
When there is several switch operating frequency Switching Power Supply inside, exchange by containing multiple switch periods composition in the input signal of circuit, also promptly contain the first-harmonic of multiple switching frequency, the humorous difference frequency that involves them.If various switch operating frequencies are f1, f2...fn, the frequency in the signal can be used the absolute value representation of following formula:
A1×f1+A2×f2+…+An×fn .........................④
A1 wherein, A2...... are not to be 0 integer entirely.
Can set the resonance frequency of series resonance branch road (100), the frequency that 4. this resonance frequency is represented corresponding to formula.
Also can be with same frequency combination or the different frequency combination that exchanges by the corresponding above-mentioned 4. formula of series resonance frequency of two or more series resonance branch roads 100 in the circuit.
Except that can be used for filtering, series resonance branch road 100 can also be as part or all of the AC coupled path by the switching frequency signal in the Switching Power Supply, and its principle is similar.
Series resonance branch road (100) also can just in time have two or more series resonance rates, can set them corresponding to the two or more combination of frequencies that can 4. represent with formula.
Fig. 3 the present invention just has an application example of the series resonance branch road (100) of two or more series resonance frequencys, it shows, it is possible that a series resonance branch road (100) has a plurality of resonance frequencys, and can set the combination of frequency that 4. resonance frequency more than 2 or 2 is represented corresponding to the formula more than 2 or 2.Among the figure, a termination common port COM after L7 and the C7 parallel connection, the end of another termination C6, one end of the other end of C6 and L inductance 6 is connected, the end of another termination filter inductance L1 of L6, as the output OUTA of circuit at the corresponding levels, the other end of L1 is as the input INA of circuit at the corresponding levels.In this circuit, the parallel circuits of L7 and C7 also can be used as the capacitive part with C6 with the different perception parts that all both can be used as of the series circuit video frequency of L6, and obviously, this circuit can design has two series resonance frequencys.Select suitable parameters can make them correspond respectively to the 4. frequency of expression.
The improved BUCK of the present invention (buck) basic circuit is seen Fig. 5, in the traditional circuit, one of gate-controlled switch Q terminates to power input INA, the negative terminal of unidirectional device D connects the other end of gate-controlled switch and links to each other with the end of filter inductance L1, the anode of unidirectional device D links to each other with the common port COM of input with output, the end of the other end of L1 and filter capacitor C1 links to each other as the output OUTA of circuit at the corresponding levels, another termination common port COM of C1.In the improved circuit, series resonance branch road (100) is parallel on the original filter capacitor C1, thereby has improved its filter circuit.Other forms of reduction voltage circuit can be used by the principle of this circuit easily.
The improved BOOST of the present invention (boost type) basic circuit is seen Fig. 6, in traditional booster circuit, one end of inductance L 1 links to each other with power input INA, the other end links to each other with the end of gate-controlled switch Q and the anode of unidirectional device D, the other end of gate-controlled switch is received common port COM and is linked to each other, the end of the other end of unidirectional device D and filter capacitor C1 links to each other, and as the output OUTA of circuit at the corresponding levels, the other end of C1 is received common port COM.In the improved circuit of the present invention, the series resonance branch road 100 that inductance L 2 and capacitor C 2 series connection constitute is connected in parallel on the filter capacitor C1.Other forms of booster circuit can be used by the principle of this circuit easily.
The improved BUCK-BOOST of the present invention (falling-boost type) basic circuit is seen Fig. 7.In traditional falling-boost type circuit, the one termination power input INA of gate-controlled switch, one end of the negative terminal of the other end and unidirectional device and inductance links together, another termination input and output common port COM of inductance L 1, the end of the anode of unidirectional device and filter capacitor C1 links to each other, as the output OUTA of circuit at the corresponding levels, the other end of C1 links to each other with common port COM.In the improved circuit, the series resonance branch road 100 that inductance L 2 and capacitor C 2 series connection constitute is connected in parallel on the filter capacitor C1.Fall-other forms of booster circuit can use by the principle of this circuit easily.
The improved BOOST-BUCK of the present invention (liter-step-down) basic circuit is seen Fig. 8, in traditional liter-step-down voltage, one end of inductance L 1 is connected to power input INA, the end of the other end and gate-controlled switch Q and the end of coupling capacitance C3 connect together, the other end of gate-controlled switch is connected to common port COM, the anode of the other end of coupling capacitance C3 and unidirectional device D, inductance L 3 connect together, the other end of D is linked common port COM, the end of the other end of L3 and filter capacitor C1 is connected, as the output OUTA of circuit at the corresponding levels, the other end of C1 is received common port COM.In the improved liter-reduction voltage circuit of the present invention, the series resonant circuit 100 that is made of L2 and C2 series connection is connected in parallel on the output capacitance C1, and the series resonant circuit 200 that is made of L4 and C4 series connection is connected in parallel on coupling capacitance C3 and has gone up coupling.Present embodiment has used two series resonant circuit L4C4 and L2C2, and these two series resonant circuits play a part different, and series resonant circuit 200 plays coupling, can reduce the capacity of coupling capacitance, reduces the circuit cumulative volume.Other forms of liter-reduction voltage circuit can be used by the principle of this circuit easily.
The present invention is used for Switching Power Supply conversion front end DC side or the alternating current input power supplying filter circuit for filtering is seen Fig. 9, and series resonance branch road 100 is in parallel with capacitor C 1, draws direct voltage input HF switch converter from capacitor C 1 two ends.
Figure 13 is the high-frequency coupling circuit that the present invention is applied to half-bridge, full-bridge, asymmetrical half-bridge switching circuit etc., the end of coupling capacitance C3 connects switching circuits such as half-bridge, full-bridge, asymmetrical half-bridge in the traditional circuit, the other end links to each other with transformer, load or other late-class circuits, in the improved coupling circuit, series resonant circuit (200) is connected in parallel on the C3, can reduce the total capacity of electric capacity.
Figure 10 is the output filter circuit that the present invention is used to export the Switching Power Supply of constant current, improve in the preceding circuit, the end of L1 is connected to the input INA of HF switch conversion, the other end links to each other with the end of filter capacitor C3 and the end of L3, another termination common port COM of capacitor C 3, the other end of inductance L 3 links to each other as the output OUTA of circuit at the corresponding levels with filter capacitor C1, and the other end of capacitor C 1 is connected to common port COM.In the improved circuit of the present invention, the series resonance branch road 200 that series resonance branch road 100, IA and the C4 series connection that is made of L2 and C2 series connection constitutes all is parallel on the capacitor C 3, and the series resonant circuit 300 that is made of L5 and C5 series connection is connected in parallel on the capacitor C 1.The series resonance frequency of series resonance branch road can be set according to the switch ripple current among the L1, for example, series resonance branch road 100 and 200 resonant frequency point are corresponding to the first-harmonic and the triple-frequency harmonics of switch ripple current, and the resonance frequency of series resonance branch road 300 is corresponding to the first-harmonic of switch ripple current.Because the load impedance of constant-current source may be very low even be 0, thereby filter capacitor is generally bigger, adopt the present invention after, can reduce the filter capacitor capacity greatly, thereby reduce volume, reduce cost.
Figure 11 is that the present invention is used for DCAC conversion filter circuit for filtering, in traditional filter circuit, one end of inductance L 1 is connected to an end of switch change-over unit output, and the other end links to each other with the end of filter capacitor C1, and the other end of C1 is connected to the other end of switch change-over output.In the improved circuit, the series resonance branch road 100 that is made of L2 and C2 series connection is connected in parallel on the filter capacitor C1.Can reduce the capacity of total capacitance, in the circuit of the big electric current of output, effect is more obvious.
Figure 12 is the filter circuit that the present invention is used in combination with common mode inductance, has replaced the L3 among Fig. 4 with common mode inductance in Figure 13 circuit.Because common mode inductance has certain differential-mode component, thereby circuit has the effect similar to Fig. 3 circuit, the end of filter inductance L1 is connected to an end INA of input switch signal among Figure 12, one end of the other end and capacitor C 3, an input of one end of series resonance branch road 100 and common mode inductance connects together, the other end of the other end of capacitor C 1 and series resonance branch road 100, another input of common mode inductance all is connected to another input INB of switching signal, capacitor C 1 is connected in parallel on two outputs of common mode inductance, as two output 0UTA of circuit at the corresponding levels, 0UTB.
Some electric capacity is inductive under higher-frequency, as alminium electrolytic condenser, therefore can replace the capacitances in series of capacitive under inductance and this frequency with alminium electrolytic condenser, forms the series resonance point, constitutes the resonance branch road under certain frequency.Figure 14 is that the present invention adopts the filter circuit that perceptual electric capacity and capacitive capacitances in series form under the high frequency, one end of inductance L 1 is connected to switching signal input INA, connecting together of one end of the other end of L1 and capacitor C 1 and the resonance branch road 300 that is composed in series by capacitor C 4 and CL, as the output 0UTA of circuit at the corresponding levels, the end in addition of capacitor C 1 and the other end of series resonance branch road 300 are all received input and output common port COM.
Claims (12)
1, a kind of Switching Power Supply contains switching signal formation circuit and passes through circuit with exchanging; Switching signal forms circuit and is used to form the electric current that exchanges or pulse, wherein include the switch ripple current, interchange is used for decaying by circuit or one or more characteristic frequency compositions by these switch ripple currents, it is characterized in that: exchange by circuit comprise one or more by mutual series connection the unit that under described characteristic frequency, is perception and be the series resonance branch road (100) that the unit of capacitive is formed, wherein at least one resonance frequency at least one series resonance branch road (100) is corresponding to the frequency of current amplitude maximum in the multiple radio-frequency component of switch ripple current that is input to this resonance branch road (100).
2, Switching Power Supply as claimed in claim 1 is characterized in that: at least one resonance frequency at least one series resonance branch road (100) is corresponding to the frequency of current amplitude maximum in the multiple radio-frequency component of master switch ripple current.
3, Switching Power Supply as claimed in claim 1, it is characterized in that: described series resonance branch road (100) has two or more series resonance frequencys, wherein has at least two resonance frequencys to correspond respectively to the maximum and second largest frequency of amplitude in switch ripple current input circuit at the corresponding levels or total input.
4, Switching Power Supply as claimed in claim 1 or 2 is characterized in that: described interchange also comprises filter capacitor (C1) by circuit, is parallel to series resonance branch road (100).
5, Switching Power Supply as claimed in claim 1 or 2 is characterized in that: described interchange also comprises inductance (L3) by circuit, and it is connected between described series resonance branch road (100) and the late-class circuit.
6, Switching Power Supply as claimed in claim 1 or 2 is characterized in that: the inductive element in the described series resonance branch road (100) is the electric capacity that is perception under high frequency.
7, Switching Power Supply as claimed in claim 1 or 2 is characterized in that: described series resonance branch road (100) also includes the resonance frequency of setting according to the absolute value of following formula:
A1×f1+A2×f2+…+An×fn
A1 wherein, A2......An are not to be 0 integer entirely, f1, f2 ..., fn is the central value of the switch ripple current various switching frequencies that may have.
8, Switching Power Supply as claimed in claim 1 or 2 is characterized in that it comprises at least a in the following basic transformation circuit: reduction voltage circuit, booster circuit, liter-reduction voltage circuit, fall-booster circuit, direct current exchanges (DCAC) HF switch translation circuit, half-bridge, full-bridge, asymmetrical half-bridge translation circuit; Series resonance branch road (100) is parallel to described reduction voltage circuit or booster circuit or liter-reduction voltage circuit or fall-output circuit of booster circuit in, be used to export filtering; Perhaps be series at liter-reduction voltage circuit and boost between part and step-down part, be used for high-frequency coupling; Perhaps be parallel to the interchange input side of Switching Power Supply, be used for exchanging input filtering; Perhaps be parallel to Switching Power Supply conversion front end DC side, be used for the DC side power filter; Perhaps be parallel to direct current and exchange (DCAC) HF switch translation circuit interchange output circuit, be used for direct current and exchange (DCAC) conversion output filtering; Perhaps between half-bridge, full-bridge, asymmetrical half-bridge translation circuit and output circuit, be used for high-frequency coupling.
9, Switching Power Supply as claimed in claim 1 or 2 is characterized in that, described interchange is used to export the output filtering of constant-current source by circuit.
10, Switching Power Supply as claimed in claim 9, it comprises at least two series resonant circuits, and series resonance frequency is equal, corresponds respectively to the frequency of amplitude maximum in the ripple current total or that import circuit at the corresponding levels.
11, Switching Power Supply as claimed in claim 5, described inductance (L3) replaces with the differential-mode component of common mode inductance.
12, Switching Power Supply as claimed in claim 1 or 2 is characterized in that: at least one resonance frequency in the series resonance branch road (100) is corresponding to the fundamental frequency of switch ripple current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021151563A CN1148860C (en) | 2002-04-24 | 2002-04-24 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021151563A CN1148860C (en) | 2002-04-24 | 2002-04-24 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1377124A CN1377124A (en) | 2002-10-30 |
| CN1148860C true CN1148860C (en) | 2004-05-05 |
Family
ID=4743483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021151563A Expired - Lifetime CN1148860C (en) | 2002-04-24 | 2002-04-24 | Switching power supply |
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| CN (1) | CN1148860C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337945A (en) * | 2013-06-25 | 2013-10-02 | 合肥工业大学 | Passive inverter output filter with series resonance branch circuit |
| CN105141157A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Single-stage vehicle-mounted power supply inverter capable of boosting voltage and reducing voltage |
| CN108649789A (en) * | 2018-05-29 | 2018-10-12 | 北京北广科技股份有限公司 | Radio-frequency power supply resistance to crosstalk method and device |
| CN110221645B (en) * | 2019-06-11 | 2021-05-18 | 广州金升阳科技有限公司 | Ripple current generating circuit |
| CN113890318A (en) * | 2021-10-25 | 2022-01-04 | 四川航电微能源有限公司 | Power filter, high-frequency ripple filtering method and power supply |
-
2002
- 2002-04-24 CN CNB021151563A patent/CN1148860C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1377124A (en) | 2002-10-30 |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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Granted publication date: 20040505 |