CN203423618U - Power supply having function of absorbing micro pulse waves - Google Patents
Power supply having function of absorbing micro pulse waves Download PDFInfo
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- CN203423618U CN203423618U CN201320496202.0U CN201320496202U CN203423618U CN 203423618 U CN203423618 U CN 203423618U CN 201320496202 U CN201320496202 U CN 201320496202U CN 203423618 U CN203423618 U CN 203423618U
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Abstract
The utility model discloses a power supply having a function of absorbing micro pulse waves. The power supply comprises a rectification and filtering module, a first micro pulse wave discharge module, at least one micro pulse wave isolation module, at least one second filtering module and a second micro pulse wave discharge module. The rectification and filtering module includes a rectifier bridge and a first filtering capacitor. The first micro pulse wave discharge module is arranged at an output terminal of the rectifier bridge for discharging micro pulse waves generated by the first filtering capacitor. The micro pulse wave isolation modules are sequentially arranged at the output terminal of the rectifier bridge for isolating negative micro pulse waves generated by pin induction of the first filtering capacitor. Each second filtering module includes a second filtering capacitor. The second micro pulse wave discharge module is arranged at an output terminal of the power supply to perform secondary discharge on residual micro pulse waves which have passed the at least one micro pulse wave isolation module and micro pulse waves generated by the second filtering capacitor. The power supply provided by the utility model is capable of absorbing micro pulse waves at time intervals smaller than nanoseconds and microseconds, thereby effectively improving the transient and EMC performance of the power supply in a high-frequency circuit system.
Description
Technical field
The utility model relates to signal transmission technology field, particularly a kind of supply unit with micropulse ripple absorption function.
Background technology
In common AC-DC power circuit, owing to there is the additional parameter such as inductance, high frequency skin resistance, D.C. resistance in the pin of filter capacitor, because of load current sudden change or when driving inductive load the current break of source in the situation that, will there is impulse wave in filter capacitor both end voltage.Due to many-sided reasons such as conductor skin effect, conductive surface defect, absorption device speed, cause impulse wave the initial utmost point occurring in the short time (for example psec and femtosecond are interval) can not be included line capacitance and absorb well at interior all kinds of conventional devices, this is a typical EMI(Electro Magnetic Interference who is extensively present in power circuit, electromagnetic interference) problem.
Frequency spectrum analysis method based on Fourier transform may be not high to this class frequency of occurrences but the local impulse wave with extremely high frequency character, very easily cause and ignore, because traditional instrument is also difficult to capture it at the trace in nanosecond psec district, so the power supply ripple appraisement system of ordinary meaning does not consider that it is in this interval completely.And in fact custom circuit rises and declines gradually with frequency the inhibition ability of power supply AC ripple, thereby need to cause enough attention to its harm.
At present, at high-frequency circuit and the audio area very responsive to this type of impulse wave, serious blank especially to the understanding of this problem and processing.
Utility model content
The purpose of this utility model is intended at least solve one of above-mentioned technological deficiency.
For this reason, the utility model need to propose a kind of supply unit with micropulse ripple absorption function, can absorptance nanosecond and the micropulse ripple at the interval shorter time of microsecond interval, effectively improve transient state and the EMC performance of power supply in high-frequency circuit system, the audio coding of particularly eliminating audio area at audio area to improving tonequality has special significance.
For achieving the above object, a kind of supply unit with micropulse ripple absorption function the utility model proposes comprises: rectification filtering module, described rectification filtering module comprises rectifier bridge and the first filter capacitor, the input of described rectifier bridge is connected with the alternating current of input, and the output of described rectifier bridge is in parallel with described the first filter capacitor; The first micropulse ripple module of releasing, described the first micropulse ripple module of releasing is arranged on the output of described rectifier bridge, and described the first micropulse ripple micropulse ripple that module produces described the first filter capacitor of releasing is released; At least one micropulse ripple isolation module and at least one second filtration module, the output that described in each, micropulse ripple isolation module is successively set on described rectifier bridge is to isolate the negative sense micropulse ripple of described the first filter capacitor pin inductance generation, described in each, the second filtration module comprises the second filter capacitor, and described the second filter capacitor is connected in parallel on the corresponding output of micropulse ripple isolation module described in each; The second micropulse ripple module of releasing, described the second micropulse ripple module of releasing is arranged on micropulse ripple that the output of described supply unit produces with the remaining micropulse ripple to by described at least one micropulse ripple isolation module and described the second filter capacitor and carries out secondary and release.
According to the supply unit the utility model proposes, can absorptance nanosecond and the micropulse ripple at the interval shorter time of microsecond interval, effectively improve transient state and the EMC performance of power supply in high-frequency circuit system, the audio coding of particularly eliminating audio area at audio area to improving tonequality has special significance, make the tone color of sound equipment become soft, parsing power is improved.
Wherein, described supply unit, also comprises: the 3rd micropulse ripple module of releasing, described the 3rd micropulse ripple module of releasing is arranged between the alternating current of described input and the input of described rectifier bridge, for releasing to exchanging the micropulse ripple that end produces.
And described the 3rd micropulse ripple module of releasing comprises: resistance; Other the first high frequency capacitance group of the pf in parallel with described resistance and ff level; And first voltage-stabiliser tube in parallel with described the first high frequency capacitance group.
Particularly, described the first micropulse ripple module of releasing comprises the second high frequency capacitance group and the second voltage-stabiliser tube, in parallel with described the first filter capacitor after described the second high frequency capacitance group and described the second voltage-stabiliser tube parallel connection.Described in each, the second filtration module also comprises third high capacitance group and the 3rd voltage-stabiliser tube frequently, in parallel with described the second filter capacitor after described third high frequency capacitance group and the 3rd voltage-stabiliser tube parallel connection.
Wherein, described in each, micropulse ripple isolation module can be diode.
Preferably, described the second micropulse ripple module of releasing comprises: the 4th high frequency capacitance group that the 4th high frequency capacitance of a plurality of parallel connections forms; Four voltage-stabiliser tube in parallel with described the 4th high frequency capacitance group.
Preferably, described the first filter capacitor and described the second filter capacitor can have metal shell, and the direct ground connection or exchange ground connection of described metal shell.
The aspect that the utility model is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the utility model and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
The line map that viewing test adopts is carried out in the generation that Fig. 1 is the impulse wave by power circuit;
Fig. 2 is the oscillogram recording while discharging and recharging on the electric capacity of power circuit in Fig. 1;
Fig. 3 is according to the circuit diagram of the supply unit with micropulse ripple absorption function of the utility model embodiment; And
Fig. 4 is according to the circuit diagram of the supply unit with micropulse ripple absorption function of an embodiment of the utility model.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Disclosing below provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skills can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are for the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.
In description of the present utility model, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
With reference to description and accompanying drawing below, by these and other aspects of clear embodiment of the present utility model.In these descriptions and accompanying drawing, specifically disclose some particular implementation in embodiment of the present utility model, represent to implement some modes of the principle of embodiment of the present utility model, but should be appreciated that the scope of embodiment of the present utility model is not limited.On the contrary, embodiment of the present utility model comprises spirit and all changes within the scope of intension, modification and the equivalent that falls into additional claims.
The mechanism of production of impulse wave in power circuit was once described first below before describing the supply unit with micropulse ripple absorption function that the utility model embodiment proposes.
The line map that viewing test adopts is carried out in the generation that Fig. 1 is the impulse wave by power circuit.Wherein, be the clear capacitor charge and discharge phenomenon of moment that captures, can adopt square-wave pulse power source and realize by lengthening the method for filter capacitor pin.Fig. 2 is the oscillogram recording while discharging and recharging on electric capacity, for clear, shows, part is amplified.
As shown in Figure 1, the moment discharging and recharging at power supply, on circuit electric current I can regard as constant, the electric current on electric capacity will occur the sudden turn of events (reverse current when diode turn-offs also can strengthen this variable, first ignores at this).Inductive drop formula V=L(dI/dt), get dt=10ps, dI=0.6A, lc=5nh, draws Vlc=300V, small inductor amount, large current changing rate, be the feature of power filtering capacitor pin inductance effect.And the factor that affects burr shape in side circuit also has the high frequency skin resistance of electric capacity, D.C. resistance, capacitance etc.If the electric current sudden turn of events at a high speed appears in circuit load, this phenomenon equally also there will be.And on ordinary meaning, even if it is believed that and have impulse wave like this, the distributed capacitance between power cable or bus plane also can be absorbed, regrettably due to the existence of skin effect, the electric current changing at a high speed can only, in the transmission of cable surface, make cable resistance much larger than normal D.C. resistance.More seriously, cable is made by copper material conventionally, and the oxide-film that surface there will be one deck to be comprised of Cu2O and CuO may exist transitional region gradually between the compacted zone of this oxide-film and pure copper layer.The electromagnetic field that electronics is changed is rapidly clamp-oned in the high semiconductor layer of cupric oxide content, or has been equivalent to enter very coarse conductive surface, has further strengthened cable resistance, and this almost lost efficacy the line capacitance charging originally changing for Absorption Current.This generate at femtosecond and psec interval, and decay extends to microsecond millisecond, and the impulse wave being comprised of differential mode pulse, pulsed electromagnetic radiation and common mode pulse is impulse wave to be solved in the utility model, in the utility model, can be called micropulse ripple.They are different with the impulse wave of conventionally mentioning in electromagnetic compatibility EMC theory, and when this micropulse ripple is most, average energy is little, and decay is indicial response, and amplitude is positive and negative distribution.And the impulse wave of conventionally mentioning in electromagnetic compatibility EMC theory, generally by mechanical switch and large-scale inductive load, caused, nanosecond generates, in nanosecond voltage kilovolt left and right, occur in groups, have larger average energy, univoltage distributes, decay is indicial response, from power supply and interface section, enters circuit.
Concerning most application, as long as impact to finish, it is normal that circuit recovers, and so extremely short impact can't cause consequence, but concerning having the sensory system of memory characteristic, situation may be just different.Along with audio frequency amplifier the increase of output power, source current increases thereupon, and the amplitude of this micropulse ripple is just larger, is reflected in sense of hearing, occurs that sound field is unstable, cacophonize.It has been generally acknowledged that, the margin of power of crystal amplifier needs very large, after significantly reducing the pulse energy of this type of micropulse ripple, the deposit of the power of amplifier in fact can be little a lot, and this phenomenon is can not be found in conventional at present audifier power test.
Because the micropulse ripple rise time is extremely short, decay rapidly, can trigger common facilities for observation hardly, even probe wire all may be decayed rapidly, and it transmits, while and its harmonic frequency ratio, and the frequency of its appearance is very low again, therefore be difficult to flutter the trace of grasping it, blank especially to its processing.Present inventor, through years of researches, has verified its existence finally well at audio area, because through long-term evolution, human auditory system has possessed the feature comparatively responsive to trickle fast-changing abnormal sound.Loudness of a sound is proportional to the acceleration of the diaphragm of loudspeaker, and the little pulse wave energy of integral energy makes vibrating diaphragm possess local larger acceleration.Rare pulse wave energy formation event in people's ear smoothly in the Nature like this, and remembered.When the frequency occurring when impulse wave and the sound of intensity and its association meet certain condition, the appearance of impulse wave has just affected people's perception.One of Primary Study shows, the distortion that micropulse wavestrip is come, may be the main body of circuit distortion in sound system, or most important part.And by the phenomenon reality that transient intermodulation, interface intermodulation distortion etc. are explained, all derive from this in this field.
Therefore, inventor is through many experiments, the device having absorbed by increased the micropulse ripple of short time interval in normal power supplies filter circuit, solved at one stroke an above-mentioned difficult problem, the effective EMC performance of improvement equipment, has improved the transient response ability of power supply, has reduced radiated interference, especially at audio area, to improving tonequality, there is profound significance.
Below just with reference to accompanying drawing, the supply unit with micropulse ripple absorption function proposing according to the utility model embodiment is described.
Fig. 3 is according to the circuit diagram of the supply unit with micropulse ripple absorption function of the utility model embodiment.As shown in Figure 3, this supply unit with micropulse ripple absorption function comprises rectification filtering module 10, the first micropulse ripple module 20, at least one micropulse ripple isolation module 30 and at least one the second filtration module 40 and the second micropulse ripple module 50 of releasing of releasing.
Wherein, rectification filtering module 10 comprises rectifier bridge 101 and the first filter capacitor EC1, and the input of rectifier bridge 101 is connected with the alternating current AC of input, and the output of rectifier bridge 101 is in parallel with the first filter capacitor EC1.The first micropulse ripple module 20 of releasing is arranged on the output of rectifier bridge 101, for the micropulse ripple that the first filter capacitor EC1 is produced, releases.Each micropulse ripple isolation module 30 is successively set on the output of rectifier bridge 101, the negative sense micropulse ripple producing for isolating the first filter capacitor EC1 pin inductance, each second filtration module 40 comprises the second filter capacitor EC2, and the second filter capacitor EC2 is connected in parallel on the output of corresponding each micropulse ripple isolation module 30.Release micropulse ripple that output that module 50 is arranged on supply unit produces for the remaining micropulse ripple to by least one micropulse ripple isolation module 30 and the second filter capacitor EC2 of the second micropulse ripple carries out secondary and releases.
In an embodiment of the present utility model, as shown in Figure 4, above-mentioned supply unit also comprises the 3rd micropulse ripple module 60 of releasing, the 3rd micropulse ripple module 60 of releasing is arranged between the alternating current AC of input and the input of rectifier bridge 101, for releasing to exchanging the micropulse ripple that end produces.
Particularly, as shown in Figure 4, the 3rd micropulse ripple module 60 of releasing comprises resistance R 1, pf and ff level other first high frequency capacitance group 601 and with the first high frequency capacitance group 601 in parallel first voltage-stabiliser tube TVS1 in parallel with resistance R 1.
In the present embodiment, as shown in Figure 4, in figure, A section is the district that releases that exchanges end micropulse ripple, i.e. the 3rd micropulse ripple module 60 of releasing, be used for stoping because the sudden turn of events of rectifier bridge end electric current causes from the micropulse ripple that exchanges end inductance (the outer line inductance of transformer leakage inductance and machine etc.), it comprises the first voltage-stabiliser tube TVS1, one group of high frequency capacitance and alternating-current resistance R1.Wherein, the first voltage-stabiliser tube TVS1 determines with the peak value of circuit maximum output voltage, and gets suitable surplus, forward and reverse impulse that this device can exist in picosecond absorption circuit, and convert it directly to heat, and can not form vibration, be preferred device.It is helpless to the residual impulse lower than puncture voltage using the shortcoming of voltage-stabiliser tube and similar device, this part is mainly completed by electric capacity, for preventing that electric capacity from causing concussion to inductance loopback energy, must parallel resistance be consumed, in practical application, should want special design to absorb lead-in inductance and the resonance frequency of device, and electric capacity must adopt high-frequency structure, preferably adopt punching and three end EMI electric capacity, wherein must be formed by the electric capacity of minimum capacity, for example 0.1pf or following.In addition, surperficial non-oxidation layer, its line capacitance of high frequency wire that skin resistance is little have good absorption characteristic, can partly replace the effect of electric capacity.
As shown in Figure 4, B section is rectifier bridge 101 and the first filter capacitor EC1 and the first micropulse ripple module 20 of releasing.Wherein, the first micropulse ripple module 20 of releasing comprises the second high frequency capacitance group 201 and the second voltage-stabiliser tube TVS2, in parallel with the first filter capacitor EC1 after the second high frequency capacitance group 201 and the second voltage-stabiliser tube TVS2 parallel connection.The second voltage-stabiliser tube TVS2 in parallel and low capacity capacitance group are that the first above-mentioned micropulse ripple module 20 of releasing is used for picosecond impulse wave to do to absorb first, wherein the effect of the second voltage-stabiliser tube TVS2 is except making clamper to forward impulse wave, also negative-going pulse ripple is limited in near level ground.From differential mode impulse wave, consider that such device of releasing can unify to be placed on D section in theory, but one be because the pulse of this time period is difficult to disappear, the 2nd, near the first filter capacitor EC1 position, eliminates and can reduce swept area, reduction common mode impulse wave.Because the first filter capacitor EC1 is comprised of electrochemical capacitor conventionally, its metal shell need exchange ground connection with withstand voltage enough high frequency capacitances, guaranteeing withstand voltage also direct ground connection enough in the situation that, can reduce like this pulse of electromagnetic radiation common mode, same principle, rectifier bridge 101 also can adopt shielding mode.
As shown in Figure 4, C section is micropulse ripple distance piece step by step, comprises a plurality of micropulse ripple isolation modules 30 and a plurality of the second filtration module 40.Wherein, each micropulse ripple isolation module 30 can be diode, each second filtration module 40 also comprises third high capacitance group 401 and the 3rd voltage-stabiliser tube TVS3 frequently, and in parallel with the second filter capacitor EC2 after third high frequency capacitance group 401 and the 3rd voltage-stabiliser tube TVS3 parallel connection.In the second filtration module 40, adopt than the second higher filter capacitor EC2 of the first filter capacitor EC1 resonance frequency, and improve step by step to D section direction filter capacitor resonance frequencys at different levels, isolating diode between at different levels adopts the model that switching speed is fast, pressure drop is low, junction capacitance is little, for example Schottky.The employing of distance piece can be by the quick variable-current of charge and discharge process step by step for micropulse ripple, effectively distribute to the higher filter capacitor of each resonance frequency of rear class, reduced consequent impulse wave energy, also isolated simultaneously from exchange end microsecond and nanosecond section impulse wave, compare down, if each electric capacity is directly in parallel, because of the reason of its internal inductance, on impedance curve, can form a plurality of resonance points, cause eliminating impulse wave effect and greatly reduce.In the second filtration module 40, in parallel minimum capacity and voltage-stabiliser tube effect and the first micropulse ripple described in the B section module 20 of releasing is identical, wherein the second filter capacitor EC2 can have metal shell equally, metal shell need exchange ground connection with withstand voltage enough high frequency capacitances, is guaranteeing withstand voltage also direct ground connection enough in the situation that.
As shown in Figure 4, D section is the last filtering district of impulse wave, be the second micropulse ripple module 50 of releasing, wherein, the second micropulse ripple the 4th high frequency capacitance group 501 and four voltage-stabiliser tube TVS4 in parallel with the 4th high frequency capacitance group 501 that module 50 comprises that the 4th high frequency capacitance of a plurality of parallel connections forms that release.Be understandable that, electric capacity adopts high-frequency structure as far as possible, and as three terminal capacitor, all the other explanations are the same.
In embodiment of the present utility model, although the low side ripple of power supply can increase, high frequency ripple is reducing, and the transient state of power supply has also obtained obvious improvement.And concerning most of circuit, to the ability of the inhibition of the power supply ripple of low frequency, to be better than the inhibition to high frequency ripple or impulse wave far away.
What more than explanation was set forth is the inhibition to power frequency or Switching Power Supply switching frequency impulse wave, in actual use, impulse wave due to cause less of load current sudden change but more frequently, the circuit of supply unit of the present utility model also can have good inhibition, to the shock pulse ripple from exchanging end, this circuit equally also has good inhibition ability, this means that, at industry control and high-frequency circuit, this supply unit also has good application prospect.
It should be noted that, above introduction be the application of positive supply, in negative supply application, diode direction needs oppositely.
According to the supply unit of the utility model embodiment, can absorptance nanosecond and the micropulse ripple at the interval shorter time of microsecond interval, effectively improve transient state and the EMC performance of power supply in high-frequency circuit system, the audio coding of particularly eliminating audio area at audio area to improving tonequality has special significance, make the tone color of sound equipment become soft, parsing power is improved.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that in the situation that not departing from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is by claims and be equal to and limit.
Claims (8)
1. a supply unit with micropulse ripple absorption function, is characterized in that, comprising:
Rectification filtering module, described rectification filtering module comprises rectifier bridge and the first filter capacitor, and the input of described rectifier bridge is connected with the alternating current of input, and the output of described rectifier bridge is in parallel with described the first filter capacitor;
The first micropulse ripple module of releasing, described the first micropulse ripple module of releasing is arranged on the output of described rectifier bridge, and described the first micropulse ripple micropulse ripple that module produces described the first filter capacitor of releasing is released;
At least one micropulse ripple isolation module and at least one second filtration module, described in each, micropulse ripple isolation module is successively set on the negative sense micropulse ripple that the output of described rectifier bridge is produced to isolate described the first filter capacitor pin inductance, described in each, the second filtration module comprises the second filter capacitor, and described the second filter capacitor is connected in parallel on the corresponding output of micropulse ripple isolation module described in each;
The second micropulse ripple module of releasing, described the second micropulse ripple module of releasing is arranged on micropulse ripple that the output of described supply unit produces with the remaining micropulse ripple to by described at least one micropulse ripple isolation module and described the second filter capacitor and carries out secondary and release.
2. supply unit as claimed in claim 1, is characterized in that, also comprises:
The 3rd micropulse ripple module of releasing, described the 3rd micropulse ripple module of releasing is arranged between the alternating current of described input and the input of described rectifier bridge, and described the 3rd micropulse ripple module of releasing is released to the micropulse ripple that exchanges end and produce.
3. supply unit as claimed in claim 2, is characterized in that, described the 3rd micropulse ripple module of releasing comprises:
Resistance;
Other the first high frequency capacitance group of the pf in parallel with described resistance and ff level; And
First voltage-stabiliser tube in parallel with described the first high frequency capacitance group.
4. supply unit as claimed in claim 1, is characterized in that, described the first micropulse ripple module of releasing comprises the second high frequency capacitance group and the second voltage-stabiliser tube, in parallel with described the first filter capacitor after described the second high frequency capacitance group and described the second voltage-stabiliser tube parallel connection.
5. supply unit as claimed in claim 1, is characterized in that, described in each, micropulse ripple isolation module is diode.
6. supply unit as claimed in claim 1, is characterized in that, described in each, the second filtration module also comprises third high capacitance group and the 3rd voltage-stabiliser tube frequently, in parallel with described the second filter capacitor after described third high frequency capacitance group and the 3rd voltage-stabiliser tube parallel connection.
7. supply unit as claimed in claim 1, is characterized in that, described the second micropulse ripple module of releasing comprises:
The 4th high frequency capacitance group that the 4th high frequency capacitance of a plurality of parallel connections forms;
Four voltage-stabiliser tube in parallel with described the 4th high frequency capacitance group.
8. supply unit as claimed in claim 1, is characterized in that, described the first filter capacitor and described the second filter capacitor have metal shell, and the direct ground connection of described metal shell or interchange ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320496202.0U CN203423618U (en) | 2013-08-14 | 2013-08-14 | Power supply having function of absorbing micro pulse waves |
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| CN201320496202.0U CN203423618U (en) | 2013-08-14 | 2013-08-14 | Power supply having function of absorbing micro pulse waves |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377952B (en) * | 2013-08-14 | 2017-09-15 | 颜至远 | Supply unit with micro pulse wave absorption function |
| CN108336898A (en) * | 2018-04-11 | 2018-07-27 | 四川升华电源科技有限公司 | Brick filter module and power supply module |
-
2013
- 2013-08-14 CN CN201320496202.0U patent/CN203423618U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377952B (en) * | 2013-08-14 | 2017-09-15 | 颜至远 | Supply unit with micro pulse wave absorption function |
| CN108336898A (en) * | 2018-04-11 | 2018-07-27 | 四川升华电源科技有限公司 | Brick filter module and power supply module |
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Effective date of registration: 20160415 Address after: 100094 middle building, No. 50 apricot Road, Beijing, Haidian District Patentee after: Beijing deep cloud Technology Co., Ltd. Address before: 100081 No. 28, unit 13, family building, Minzu University of China, Beijing, Haidian District, 10 Patentee before: Yan Zhiyuan |
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