CN102025283A - Rectifier circuit structure capable of reducing ripples in transmission of line voltage to secondary side - Google Patents
Rectifier circuit structure capable of reducing ripples in transmission of line voltage to secondary side Download PDFInfo
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- CN102025283A CN102025283A CN2009101737476A CN200910173747A CN102025283A CN 102025283 A CN102025283 A CN 102025283A CN 2009101737476 A CN2009101737476 A CN 2009101737476A CN 200910173747 A CN200910173747 A CN 200910173747A CN 102025283 A CN102025283 A CN 102025283A
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Abstract
The invention relates to a rectifier circuit structure capable of reducing ripples in transmission of a line voltage to a secondary side, which is connected with a magnetic energy converter in parallel, wherein the magnetic energy converter is connected between a primary rectifier circuit and a secondary rectifier circuit in series. The rectifier circuit structure comprises a ripple sampling circuit, a proportional amplifier circuit and an inverting amplifier circuit. A ripple sampling circuit samples from the input end of the magnetic energy converter; a signal input into the magnetic energy converter is used as a sample ripple signal; the proportional amplifier circuit receives the sample ripple signal, amplifies the sample ripple signal to generate an amplified sample ripple signal and outputs the amplified sample ripple signal to the inverting amplifier circuit, so that the inverting amplifier circuit can output a signal opposite in phase to the amplified sample ripple signal and the signal can be superposed with a signal output by the magnetic energy converter; and thus, the ripple signals generated in the transmission of the line voltage from the primary side to the secondary side of the magnetic energy converter are reduced.
Description
Technical field
The present invention relates to a kind of rectification circuit structure that reduces line voltage to the secondary side ripple, particularly relate to the reduction line voltage that is applied to supply unit rectification circuit structure to the secondary side ripple.
Background technology
Employed in daily life electronic equipment (for example: television set, sound equipment, computer ... etc.), the running of its internal electronic element must be used DC power supply, therefore must use magnetic energy converter to convert alternating current the DC power supply of various different voltages to, so that these electronic equipments are brought into play function.
Fig. 1 is the existing known magnetic energy converter and the circuit structure diagram of primary side rectification circuit and secondary side rectification circuit thereof.As shown in Figure 1, be electrically connected with a primary side rectification circuit 11, then be electrically connected with a secondary side rectification circuit 12 at secondary side at the primary side of magnetic energy converter 10.Line voltage includes a transformer 13 in the magnetic energy converter 10, so that can boost or step-down by transformer 13.Yet because line voltage is when low frequency (less than the 1k hertz), the dominant frequency signal of line voltage is reached in the process of secondary side through transformer 13 by primary side, can cause quite high ripple voltage at secondary side, and then makes on the dominant frequency signal of secondary side and produce the ripple noise.
And can reduce ripple voltage by the mode that improves capacitor C 03 capacitance in parallel at present with bridge rectifier, yet the size of capacitance can't ad infinitum improve in practical operation, therefore still can't effectively be reduced in the ripple noise on the secondary side dominant frequency signal, also because the dominant frequency signal generation of being exported at magnetic energy converter 10 has the ripple noise, so the also related quality that influences power supply unit.
This shows that the rectification circuit of above-mentioned existing magnetic energy converter obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found the rectification circuit structure of a kind of novel reduction line voltage to the secondary side ripple, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, overcome the defective of the rectification circuit existence of existing magnetic energy converter, and provide the rectification circuit structure of a kind of novel reduction line voltage to the secondary side ripple, technical problem to be solved is ripple signal same-phase and the opposite signal of amplitude that produces with magnetic energy converter by producing, to reach the effect that reduces the ripple signal, be very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of rectification circuit structure that reduces line voltage to the secondary side ripple according to the present invention's proposition, it is parallel to a magnetic energy converter, this magnetic energy converter is to be series between a primary side rectification circuit and the secondary side rectification circuit, and this rectification circuit structure comprises: a ripple sample circuit, the input of its input and this magnetic energy converter electrically connects, and the output of this ripple sample circuit is output one a sampling ripple signal; One ratio amplifying circuit, it receives this sampling ripple signal, and the ripple signal of should taking a sample amplifies to produce an amplification sampling ripple signal; And a see-saw circuit, it receives this amplification sampling ripple signal, and will amplify the input that the ripple signal inversion of taking a sample exports this secondary side rectification circuit to, to reduce the ripple signal that this magnetic energy converter is exported.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, wherein said ripple sample circuit has a sampling transformer, and the primary side of this sampling transformer is electrically connected at the input of this magnetic energy converter, and an end of the secondary side of this sampling transformer is electrically connected to an earth terminal.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, and wherein said ratio amplifying circuit has: one first resistance, one end are that the end with the output of this ripple sample circuit electrically connects; One second resistance, it is to electrically connect with the other end of this first resistance, and the other end of this second resistance is electrically connected to the other end and an earth terminal of the output of this ripple sample circuit; One differential amplifier, it has one first normal phase input end, one first inverting input and one first output, wherein this first normal phase input end be and this first resistance and this second resistance between node electrically connect; One the 3rd resistance, one end are to be electrically connected at this first inverting input, and the other end of the 3rd resistance is to be electrically connected at this earth terminal; And one the 4th resistance, the one end is to be electrically connected at this first output, the other end of the 4th resistance is to be electrically connected at this first inverting input.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, and it further has a buffer amplifier circuit, and it is this amplification sampling ripple signal that receives this ratio amplifying circuit output, and increases its input impedance to form an ideal source.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, wherein said buffer amplifier circuit is made up of an operational amplifier, and this operational amplifier has one second normal phase input end, one second inverting input and one second output, wherein this second normal phase input end is and the one first output electric connection of this ratio amplifying circuit, and this second output is and this second inverting input electrically connects.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, and wherein said see-saw circuit is the amplification sampling ripple signal that receives this buffer amplifier circuit output.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, wherein said see-saw circuit is made up of an inverting amplifier, this inverting amplifier has one the 3rd normal phase input end, one the 3rd inverting input and one the 3rd output, wherein the 3rd inverting input is to electrically connect with this second output, the 3rd normal phase input end is to be electrically connected at an earth terminal, and the 3rd output is the output that is electrically connected at this magnetic energy converter.
Aforesaid reduction line voltage is to the rectification circuit structure of secondary side ripple, wherein said see-saw circuit is made up of an inverting amplifier, this inverting amplifier has one the 3rd normal phase input end, one the 3rd inverting input and one the 3rd output, wherein the 3rd inverting input is to electrically connect with one first output of this ratio amplifying circuit, the 3rd normal phase input end is to be electrically connected at an earth terminal, and the 3rd output is the output that is electrically connected at this magnetic energy converter.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, the present invention reduces line voltage to the rectification circuit structure of secondary side ripple and has following advantage and beneficial effect at least:
One, the present invention is by the rectification circuit structure that reduces line voltage to the secondary side ripple in parallel on magnetic energy converter, in order to reduce the ripple signal of magnetic energy converter secondary side.
Two, the present invention utilizes and produces ripple signal same-phase and the anti-phase signal of amplitude that produces with magnetic energy converter, and then repeals by implication with the original ripple signal that produces of magnetic energy converter, in order to reach the effect that reduces the ripple signal.
In sum, the invention relates to a kind of rectification circuit structure that reduces line voltage to the secondary side ripple, it is in parallel with magnetic energy converter, and magnetic energy converter then is series between primary side rectification circuit and secondary side rectification circuit.Rectification circuit structure of the present invention comprises: the ripple sample circuit; The ratio amplifying circuit; And see-saw circuit.The ripple sample circuit is from the input sampling of magnetic energy converter, and the signal that will input to magnetic energy converter is as sampling ripple signal, the ratio amplifying circuit then receives sampling ripple signal, and it is amplified to produce export see-saw circuit to after amplifying sampling ripple signal, so that see-saw circuit is exportable and amplify the signal of sampling ripple signal inversion, so as to the signal stack of magnetic energy converter output, and then reduce line voltage and be passed to the ripple signal that secondary side produces by the primary side of magnetic energy converter.The present invention has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the existing known magnetic energy converter and the circuit structure diagram of primary side rectification circuit and secondary side rectification circuit thereof.
Fig. 2 is a kind of schematic diagram that reduces line voltage to first preferred embodiment of the rectification circuit structure of secondary side ripple of the present invention.
Fig. 3 A is the schematic diagram of preferred embodiment of waveform of the primary side input of magnetic energy converter in Fig. 2.
Fig. 3 B is the schematic diagram of preferred embodiment of waveform of the secondary side output of magnetic energy converter in Fig. 2.
Fig. 4 A is the schematic diagram of the preferred embodiment of the waveform of first node in Fig. 2.
Fig. 4 B is the schematic diagram of the preferred embodiment of the waveform of Section Point in Fig. 2.
Fig. 4 C is the schematic diagram of the preferred embodiment of the waveform of the 3rd node in Fig. 2.
Fig. 5 A is the schematic diagram of the preferred embodiment of the waveform of see-saw circuit output among Fig. 2.
Fig. 5 B is the schematic diagram of preferred embodiment that inputs to the waveform of secondary side rectification circuit among Fig. 2.
Fig. 6 is a kind of schematic diagram that reduces line voltage to second preferred embodiment of the rectification circuit structure of secondary side ripple of the present invention.
Fig. 7 is the schematic diagram of the preferred embodiment of the waveform of the 4th node in Fig. 6.
Fig. 8 A is the schematic diagram of the preferred embodiment of the waveform of see-saw circuit output among Fig. 6.
Fig. 8 B is the schematic diagram of preferred embodiment that inputs to the waveform of secondary side rectification circuit among Fig. 6.
10: magnetic energy converter 11: the primary side rectification circuit
12: secondary side rectification circuit 13: transformer
20: ripple sample circuit 21: sampling transformer
30: ratio amplifying circuit 31: differential amplifier
40: see-saw circuit 41: inverting amplifier
50: buffer amplifier circuit 51: operational amplifier
R1: 2: the second resistance of first resistance R
4: the four resistance of 3: the three resistance R of R
P1: first node P2: Section Point
P3: the 3rd node P4: the 4th node
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, the reduction line voltage that foundation the present invention is proposed is to its embodiment of rectification circuit structure, structure, feature and the effect thereof of secondary side ripple, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to obtain one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Fig. 2 is a kind of schematic diagram that reduces line voltage to first preferred embodiment of the rectification circuit structure of secondary side ripple of the present invention.Fig. 3 A is the schematic diagram of preferred embodiment of waveform of the primary side input of magnetic energy converter in Fig. 2.Fig. 3 B is the schematic diagram of preferred embodiment of waveform of the secondary side output of magnetic energy converter in Fig. 2.Fig. 4 A is the schematic diagram of the preferred embodiment of the waveform of first node in Fig. 2.Fig. 4 B is the schematic diagram of the preferred embodiment of the waveform of Section Point in Fig. 2.Fig. 4 C is the schematic diagram of the preferred embodiment of the waveform of the 3rd node in Fig. 2.Fig. 5 A is the schematic diagram of the preferred embodiment of the waveform of see-saw circuit output among Fig. 2.Fig. 5 B is the schematic diagram of preferred embodiment that inputs to the waveform of secondary side rectification circuit among Fig. 2.Fig. 6 is a kind of schematic diagram that reduces line voltage to second preferred embodiment of the rectification circuit structure of secondary side ripple of the present invention.Fig. 7 is the schematic diagram of the preferred embodiment of the waveform of the 4th node in Fig. 6.Fig. 8 A is the schematic diagram of the preferred embodiment of the waveform of see-saw circuit output among Fig. 6.Fig. 8 B is the schematic diagram of preferred embodiment that inputs to the waveform of secondary side rectification circuit among Fig. 6.
See also Fig. 2 and shown in Figure 6, a kind of rectification circuit structure that reduces line voltage to the secondary side ripple of preferred embodiment of the present invention comprises: a ripple sample circuit 20; One ratio amplifying circuit 30; And a see-saw circuit 40, wherein the rectification circuit structure is in parallel with a magnetic energy converter 10, magnetic energy converter 10 then is series between a primary side rectification circuit 11 and the secondary side rectification circuit 12.
As shown in Figure 2, ripple sample circuit 20, the input of its input and magnetic energy converter 10 electrically connects, and can have a sampling transformer 21 in the ripple sample circuit 20.
One end of the primary side of sampling transformer 21 (being first node P1) is electrically connected at the input of magnetic energy converter 10, one end of the secondary side of sampling transformer 21 then is electrically connected at an earth terminal, and the other end of sampling transformer 21 secondary sides then is Section Point P2.Because sampling transformer 21 electrically connects mutually with the input of magnetic energy converter 10, therefore the line voltage signal (as shown in Figure 3A) that inputs to magnetic energy converter 10 can input in the sampling transformer 21 too, and the signal that therefore inputs to sampling transformer 21 primary sides is shown in Fig. 4 A.
When the coil ratio of the transformer in the magnetic energy converter 10 is 1: 2, in the oscillogram of the secondary side of magnetic energy converter 10 output then shown in Fig. 3 B.And because the coil number ratio of sampling transformer 21 can be 1: 1, therefore the signal that inputs to magnetic energy converter 10 can be utilized sampling transformer 21 equal proportions to export the secondary side of sampling transformer 21 to, and then the exportable sampling ripple signal (shown in Fig. 4 B) of the output that makes ripple sample circuit 20, and the size of sampling ripple signal can be identical with the signal magnitude that inputs to magnetic energy converter 10, the coil number that also can change sampling transformer 21 in addition than and obtain the sampling ripple signal of different proportion size.
As shown in Figure 2, ratio amplifying circuit 30 can be by a differential amplifier 31, one first resistance R 1, one second resistance R 2, one the 3rd resistance R 3 and one the 4th resistance R 4 are formed, and an end of first resistance R 1 be with ripple sample circuit 20 in the end (being Section Point P2) of sampling transformer 21 secondary side outputs electrically connect, one end of second resistance R 2 is electrically connected at the other end of first resistance R 1 again, and the other end of second resistance R 2 is the other ends that are electrically connected to earth terminal and ripple sample circuit 20 secondary side outputs, that is to say that first resistance R 1 of mutual series connection and second resistance R 2 are parallel with one another with the secondary side output of sampling transformer 21 again.
Can be by the resistance value that changes first resistance R 1, second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, so that ratio amplifying circuit 30 produces the enlargement ratio of different proportion size, therefore behind the sampling ripple signal that ratio amplifying circuit 30 receives by 20 outputs of ripple sample circuit, sampling ripple signal can amplify generation one through the effect of ratio amplifying circuit 30 and amplify sampling ripple signal (shown in Fig. 4 C), and is exported by one the 3rd node P3.
As shown in Figure 2, see-saw circuit 40, form by an inverting amplifier 41, and inverting amplifier 41 has one the 3rd normal phase input end, one the 3rd inverting input and one the 3rd output, wherein the 3rd inverting input is to electrically connect with first output (i.e. the 3rd node P3) of ratio amplifying circuit 30, amplify sampling ripple signal in order to receive, the 3rd normal phase input end of see-saw circuit 40 then is electrically connected at earth terminal.By the effect of see-saw circuit 40, produce and the signal that amplifies sampling ripple signal inversion, and export the input of secondary side rectification circuit 12 to.
Shown in Fig. 5 A, it is the oscillogram of amplifying after sampling ripple signal acts on via see-saw circuit 40, because being the outputs with magnetic energy converter 10, the 3rd output of see-saw circuit 40 electrically connects, therefore after the signal mutual superposition of being exported via signal after see-saw circuit 40 effects and magnetic energy converter 10, can reduce the ripple signal (shown in Fig. 5 B) that magnetic energy converter 10 exported and input to secondary side rectification circuit 12 again.Ideally, the ripple signal that magnetic energy converter 10 is exported can be eliminated completely, but in practical operation, since the signal that produced of see-saw circuit 40 may and the signal exported of magnetic energy converter 10 between the difference on the phase place is arranged or a little difference is arranged on waveform, therefore only can effectively reduce the ripple signal of magnetic energy converter 10 secondary sides.
As shown in Figure 6, in order further to reduce the ripple signal that magnetic energy converter 10 is exported again, the buffer amplifier circuit 50 of can between ratio amplifying circuit 30 and see-saw circuit 40, connecting, so as to receiving the amplification sampling ripple signal that ratio amplifying circuit 30 is exported, and increase its input impedance to form an ideal source, wherein buffer amplifier circuit 50 is made up of an operational amplifier 51, and operational amplifier 51 has one second normal phase input end, one second inverting input and one second output, and second normal phase input end is and first output (i.e. the 3rd node P3) electric connection of ratio amplifying circuit 30, and second output (i.e. the 4th node P4) then electrically connects with second inverting input.
Shown in Fig. 8 A, be via the oscillogram after see-saw circuit 40 effects, after the signal mutual superposition that itself and magnetic energy converter 10 are exported, the ripple signal of then can more effective reduction magnetic energy converter 10 being exported, the waveform shown in Fig. 8 B are then for eliminating the schematic diagram of ripple signal fully under perfect condition.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (8)
1. a rectification circuit structure that reduces line voltage to the secondary side ripple is characterized in that it is parallel to a magnetic energy converter, and this magnetic energy converter is to be series between a primary side rectification circuit and the secondary side rectification circuit, and this rectification circuit structure comprises:
One ripple sample circuit, the input of its input and this magnetic energy converter electrically connects, and the output of this ripple sample circuit output one sampling ripple signal;
One ratio amplifying circuit, it receives this sampling ripple signal, and the ripple signal of should taking a sample amplifies to produce an amplification sampling ripple signal; And
One see-saw circuit, it receives this amplification sampling ripple signal, and will amplify the input that sampling ripple signal inversion exports this secondary side rectification circuit to, to reduce the ripple signal of this magnetic energy converter output.
2. reduction line voltage according to claim 1 is to the rectification circuit structure of secondary side ripple, it is characterized in that wherein said ripple sample circuit has a sampling transformer, and the primary side of this sampling transformer is electrically connected at the input of this magnetic energy converter, and an end of the secondary side of this sampling transformer is electrically connected to an earth terminal.
3. reduction line voltage according to claim 1 is characterized in that to the rectification circuit structure of secondary side ripple wherein said ratio amplifying circuit has: one first resistance, one end are that the end with the output of this ripple sample circuit electrically connects; One second resistance, it is to electrically connect with the other end of this first resistance, and the other end of this second resistance is electrically connected to the other end and an earth terminal of the output of this ripple sample circuit; One differential amplifier, it has one first normal phase input end, one first inverting input and one first output, wherein this first normal phase input end be and this first resistance and this second resistance between node electrically connect; One the 3rd resistance, one end are to be electrically connected at this first inverting input, and the other end of the 3rd resistance is to be electrically connected at this earth terminal; And one the 4th resistance, the one end is to be electrically connected at this first output, the other end of the 4th resistance is to be electrically connected at this first inverting input.
4. reduction line voltage according to claim 1 is to the rectification circuit structure of secondary side ripple, it is characterized in that it further has a buffer amplifier circuit, it is this amplification sampling ripple signal that receives this ratio amplifying circuit output, and increases its input impedance to form an ideal source.
5. reduction line voltage according to claim 4 is to the rectification circuit structure of secondary side ripple, it is characterized in that wherein said buffer amplifier circuit is made up of an operational amplifier, and this operational amplifier has one second normal phase input end, one second inverting input and one second output, wherein this second normal phase input end is and the one first output electric connection of this ratio amplifying circuit, and this second output is and this second inverting input electrically connects.
6. reduction line voltage according to claim 4 is characterized in that to the rectification circuit structure of secondary side ripple wherein said see-saw circuit is the amplification sampling ripple signal that receives this buffer amplifier circuit output.
7. reduction line voltage according to claim 4 is to the rectification circuit structure of secondary side ripple, it is characterized in that wherein said see-saw circuit is made up of an inverting amplifier, this inverting amplifier has one the 3rd normal phase input end, one the 3rd inverting input and one the 3rd output, wherein the 3rd inverting input is to electrically connect with this second output, the 3rd normal phase input end is to be electrically connected at an earth terminal, and the 3rd output is the output that is electrically connected at this magnetic energy converter.
8. reduction line voltage according to claim 1 is to the rectification circuit structure of secondary side ripple, it is characterized in that wherein said see-saw circuit is made up of an inverting amplifier, this inverting amplifier has one the 3rd normal phase input end, one the 3rd inverting input and one the 3rd output, wherein the 3rd inverting input is to electrically connect with one first output of this ratio amplifying circuit, the 3rd normal phase input end is to be electrically connected at an earth terminal, and the 3rd output is the output that is electrically connected at this magnetic energy converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101737476A CN102025283A (en) | 2009-09-14 | 2009-09-14 | Rectifier circuit structure capable of reducing ripples in transmission of line voltage to secondary side |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101737476A CN102025283A (en) | 2009-09-14 | 2009-09-14 | Rectifier circuit structure capable of reducing ripples in transmission of line voltage to secondary side |
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| CN102025283A true CN102025283A (en) | 2011-04-20 |
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Citations (4)
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| JPS63178758A (en) * | 1987-01-16 | 1988-07-22 | Hitachi Ltd | Dc active filter |
| SU1553418A1 (en) * | 1988-05-06 | 1990-03-30 | Московский Институт Инженеров Железнодорожного Транспорта | Device for reducing pulsation of rectified voltage |
| US5668464A (en) * | 1994-10-26 | 1997-09-16 | The Board Of Trustees Of The University Of Illinois | Feedforward active filter for output ripple cancellation in switching power converters |
| JP2001339937A (en) * | 2000-05-25 | 2001-12-07 | Mitsubishi Electric Corp | Low-ripple power supply |
-
2009
- 2009-09-14 CN CN2009101737476A patent/CN102025283A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63178758A (en) * | 1987-01-16 | 1988-07-22 | Hitachi Ltd | Dc active filter |
| SU1553418A1 (en) * | 1988-05-06 | 1990-03-30 | Московский Институт Инженеров Железнодорожного Транспорта | Device for reducing pulsation of rectified voltage |
| US5668464A (en) * | 1994-10-26 | 1997-09-16 | The Board Of Trustees Of The University Of Illinois | Feedforward active filter for output ripple cancellation in switching power converters |
| JP2001339937A (en) * | 2000-05-25 | 2001-12-07 | Mitsubishi Electric Corp | Low-ripple power supply |
Non-Patent Citations (1)
| Title |
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| 朱双鹤等: "应用前馈技术降低开关电源的纹波", 《电工技术杂志》 * |
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Application publication date: 20110420 |