CN101056049A - Power supplier and its ripple attenuation device - Google Patents

Power supplier and its ripple attenuation device Download PDF

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Publication number
CN101056049A
CN101056049A CN 200610074385 CN200610074385A CN101056049A CN 101056049 A CN101056049 A CN 101056049A CN 200610074385 CN200610074385 CN 200610074385 CN 200610074385 A CN200610074385 A CN 200610074385A CN 101056049 A CN101056049 A CN 101056049A
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power supply
unit
capacitive
filter unit
inductive
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CN100559687C (en
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吴泉清
甘鸿坚
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Delta Electronics Inc
Delta Optoelectronics Inc
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Delta Optoelectronics Inc
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Abstract

The present invention provides a power supply which converts the AC input voltage to the DC output voltage of the required voltage value. Said power supply includes a preceding stage power transformer such as a power factor regulating converter which converts the AC input voltage into the transitional DC voltage which is established on the output capacitive unit and the back stage power transformer such as a DC-DC convertor which converts the transitional DC voltage to the DC output voltage with the required voltage value. The power supply in the present invention also includes a resonance network which is composed of an inductive filter element with inductive impedance and a filter composed of capacitive filter element having capacitive resistance. Said resonance network is positioned between the preceding stage converter and the back stage power supply converter and is coupled with the output capacitive unit and a filter processing is set to the current flows into output inductive unit. Thus, the ripple current of the output capacitive unit can be reduced in the present invention.

Description

Power supply unit and ripple attenuation device thereof
Technical field
The present invention relates to a kind of power supply unit, the invention particularly relates to a kind of power factor correcting power supply unit with ripple attenuation device of the ripple current that is used for reducing output capacitive unit.
Background technology
Fig. 1 is shown as known power supply supply 100 with power factor school (power factor correction) structure, and it is the circuit topological structure of a kind of two-part (two-stage).Power supply unit 100 shown in Figure 1 is made up of booster type power factor correcting converter (boost PFC converter) 102 and 104 of DC-to-DC converter (DC-DC converter), and wherein booster type power factor correcting converter 102 comprises bridge rectifier (bridge rectifier) 110, boost inductance L11, transistor switch S11 and diode D11.Bridge rectifier 110 is set at and is used for input ac voltage Vin is rectified into the commutated direct current pressure with scheduled voltage.Boost inductance L11 is coupled to an output of bridge rectifier 110, it is in order to receiving the electric current that bridge rectifier 110 is exported, and switches wherein according to the switch of transistor switch S11 that energy stored is released into the output capacitive unit (output capacitive unit with a capacitive impedance) with capacitive impedance via diode D11.In Fig. 1, this output capacitive unit is electrochemical capacitor Cb.In this explanation, if non-energy-storage travelling wave tubes such as other energy-storage travelling wave tube such as electrochemical capacitor Cb serial or parallel connection inductance or resistance, and its impedance in some frequency range still is capacitive impedance, then this moment electric capacity and inductance and resistance etc. integral body just be called capacitive unit.Equally, the definition for the inductive unit also is like this.For being made up of non-energy-storage travelling wave tubes such as energy-storage travelling wave tubes such as inductance, electric capacity and resistance, its impedance under some frequency range is an inductive impedance, then is referred to as the inductive unit in this frequency range.Transistor switch S11 is driven by power factor correcting signal (PFCsignal) Vg.Switch by transistor switch S11 switches, boost inductance L11 with self stored energy to output capacitive unit Cb charging, thereby on output capacitive unit Cb, produce the direct voltage (intermediate DC voltage) of a transition.DC-to-DC converter 104 is connected with booster type power factor correcting converter 102 via output capacitive unit Cb, it is set at the direct voltage that receives this transition from output capacitive unit Cb, and converts the direct voltage of this transition the output dc voltage of required voltage value to offer the load (not shown).
Yet because booster type power factor correcting converter 102 adopts the switch handover operation to convert alternating voltage to direct voltage, therefore in the output capacitive unit side, produce the alternating current of low frequency except meeting, the alternating current crest that also can produce high frequency is overlapped on the low-frequency ac electric current, does not thisly wish that the noise that obtains is called ripple current (ripple current).As shown in Figure 2, it shows the main oscillogram of booster type power factor correcting converter 102 inside, and wherein Vg is the power factor correcting signal waveforms of driving switch S11, I LBe the inductive current oscillogram, and I CbIt is the ripple current oscillogram of Cb.Figure 3 shows that booster type power factor correcting converter 102 is operated under the critical flow Discontinuous Conduction mode, is under the situation of 90W in power output, and ripple current is to the graph of a relation of input voltage value.When input voltage value was 90V, the effective value of ripple current was 0.65A as seen from Figure 3.
As previously mentioned, ripple current is still because due to the switch handover operation of transducer, it can produce voltage ripple on Cb.Moreover when long-term use, ripple current can produce high thermal conductance and cause Cb conductor inside and dielectric medium loss on Cb, and then shortens the life-span of Cb.
In order to solve this critical problem, known power factor correcting converter can adopt the electric capacity of big capacity and volume as output capacitive unit usually.Thus, it is very big that the size of output capacitance can become, and causes the lifting of manufacturing cost and the waste in space.Another solution is a high frequency capacitance Cs in parallel with Cb to be set manage to reduce ripple current in traditional power factor correcting converter, as shown in Figure 1.Yet because the cause of manufacturing process, the capacitance of high frequency capacitance Cs is added the restriction of volume generally much smaller than output capacitance Cb, and the number of high frequency capacitance Cs can not increase, so not remarkable for the effect that reduces ripple current.
Therefore need a kind of power supply unit of exploitation with and ripple attenuation device.
Summary of the invention
One object of the present invention is to provide a kind of power supply unit, it has power factor correcting converter and DC-to-DC converter, this power supply unit has ripple attenuation device, is arranged between power factor correcting converter and this DC-to-DC converter and can be set to be used for reducing the ripple current that is coupled to the output capacitive unit between power factor correcting converter and the DC-to-DC converter.
Another object of the present invention is to provide a kind of ripple attenuation device that is applied to have the power supply unit of power factor correcting, it is arranged between power factor correcting converter and the DC-to-DC converter and can be set at and is used for reducing the ripple current that is coupled to the output capacitive unit between power factor correcting converter and the DC-to-DC converter.
According to comparatively broad form of implementation of the present invention, it proposes a kind of power supply unit, and it comprises power factor correcting converter, its direct voltage in order to receive alternating voltage and this alternating voltage to be converted to transition; Output capacitive unit with capacitive impedance is coupled to this power factor correcting converter, and it is in order to produce the direct voltage of this transition; DC-to-DC converter is coupled to this output capacitive unit, and it also converts the direct voltage of this transition to required voltage value output dc voltage in order to the direct voltage that receives this transition; And resonant network, being arranged between this power factor correcting converter and this DC-to-DC converter and and coupling mutually with this output capacitive unit, its electric current that is set at flowing into this output capacitive unit carries out Filtering Processing.
According to comparatively narrow form of implementation of the present invention, it designs a kind of ripple attenuation device, be used for power supply unit, this power supply unit is made up of prime power supply changeover device and back level power supply transducer, this ripple attenuation device flows into the ripple current that is coupled to the output capacitive unit between this prime power supply changeover device and this back level power supply transducer in order to reduce, this ripple attenuation device comprises resonant network, be arranged between this its prime power supply changeover device and this back level power supply transducer and with this output capacitive unit and couple mutually, its electric current that is set at flowing into this output capacitance carries out Filtering Processing.
Specifically, the invention provides a kind of power supply unit, it comprises: the prime power supply changeover device, and it is set in order to receive the input power supply and will import the power supply that power source conversion becomes transition; Output capacitive unit with capacitive impedance is coupled to this prime power supply changeover device, and it is in order to produce the power supply of this transition; Back level power supply transducer, it is set at the out-put supply that also power supply of this transition is converted to the required voltage value in order to the power supply that receives this transition; And resonant network, being arranged between this prime power supply changeover device and this back level power supply transducer and and coupling mutually with this output capacitive unit, its electric current that is set at flowing into this output capacitive unit carries out Filtering Processing.
According to described power supply unit, this prime power supply changeover device is a power factor correcting converter, and this back level power supply transducer is a DC-to-DC converter.
According to described power supply unit, this resonant network comprises: have the capacitive character filter unit of capacitive impedance, be coupled between this prime power supply changeover device and this output capacitive unit and in parallel with this prime power supply changeover device; And the inductive filter unit with inductive impedance, be coupled between this capacitive character filter unit and this output capacitive unit, wherein this output capacitive unit is in parallel with this back level power supply transducer.
According to described power supply unit, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this inductive filter unit is an inductance.
According to described power supply unit, this resonant network comprises: have the capacitive character filter unit of capacitive impedance, be coupled between this prime power supply changeover device and this output capacitive unit and in parallel with this prime power supply changeover device; And the inductive filter unit with inductive impedance, connect with this output capacitive unit; Wherein this inductive filter unit is in parallel with this prime power supply changeover device and this back level power supply transducer with the series loop of this output capacitive unit.
According to described power supply unit, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and the inductive filter unit is an inductance.
According to described power supply unit, this resonant network comprises: have the capacitive character filter unit of capacitive impedance, be coupled between this prime power supply changeover device and this output capacitive unit and in parallel with this prime power supply changeover device; Have the first inductive filter unit of inductive impedance, connect with this output capacitive unit; And the second inductive filter unit with inductive impedance, be coupled between this capacitive character filter unit and this first inductive filter unit and the loop that output capacitive unit is connected; Wherein this output capacitive unit loop of connecting with this first inductive filter unit is in parallel with this back level power supply transducer.
According to described power supply unit, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this first inductive filter unit and the second inductive filter unit are an inductance.
According to described power supply unit, but this first inductive filter unit and this second inductive filter unit organization center tap inductance.
According to described power supply unit, this resonant network comprises: have the capacitive character filter unit of capacitive impedance, be coupled between this back level power supply transducer and this output capacitive unit; The first inductive filter unit with inductive impedance is connected with this capacitive character filter unit; And the second inductive filter unit with inductive impedance, be coupled between the series loop and this output capacitive unit of this capacitive character filter unit and the first inductive filter unit; Wherein this first inductive filter unit loop of connecting with this capacitive character filter unit is in parallel with this back level power supply transducer, and this output capacitive unit is in parallel with this prime power supply changeover device.
According to described power supply unit, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this first inductive filter unit and the second inductive filter unit are an inductance.
The present invention also provides a kind of ripple attenuation device, be used for power supply unit, this power supply unit is made up of prime power supply changeover device and back level power supply transducer, this ripple attenuation device is coupled to the ripple current of the output capacitive unit between this prime power supply changeover device and this back level power supply transducer in order to minimizing, this ripple attenuation device comprises: resonant network, be arranged between this prime power supply changeover device and this back level power supply transducer and with this output capacitive unit and couple mutually, its electric current that is set at flowing into this output capacitive unit carries out Filtering Processing.
According to described ripple attenuation device, this resonant network comprises capacitive character filter unit with capacitive impedance and the inductive filter unit with inductive impedance at least.
According to described ripple attenuation device, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this inductive filter unit is an inductance.
According to described ripple attenuation device, this prime power supply changeover device is a power factor correcting converter, and this back level power supply transducer is a DC-to-DC converter.
Advantage of the present invention and feature are by following embodiment and cooperate following accompanying drawing to describe in detail.
Description of drawings
Fig. 1 shows known power supply unit with power factor correcting structure;
Fig. 2 shows the main oscillogram of booster type power factor correcting converter inside;
Figure 3 shows that booster type power factor correcting converter 102 is operated under the critical flow Discontinuous Conduction mode, is under the situation of 90W in power output, and ripple current is to the graph of a relation of input voltage value;
Fig. 4 shows the circuit structure diagram of the first embodiment of the present invention;
Fig. 5 is presented under the selection of different filter inductance values and filter capacitor value, the variation situation of the ripple current effective value of output capacitance;
Fig. 6 (A) and Fig. 6 (B) are emulation testing figure of the present invention;
Fig. 7 (A) and Fig. 7 (B) are experimental data figure of the present invention;
Fig. 8 shows the circuit structure diagram of the second embodiment of the present invention;
Fig. 9 shows the circuit structure diagram of the third embodiment of the present invention; And
Figure 10 shows the circuit structure diagram of the fourth embodiment of the present invention.
Wherein, description of reference numerals is as follows:
100 power supply units
102 power factor correcting converters
104 DC-to-DC converter
400 power supply units
402 power factor correcting converters
404 DC-to-DC converter
412 resonant networks
Embodiment
The preferred embodiment that embodies feature of the present invention and advantage will be described in detail in the explanation of back.It is noted that the components identical label represents components identical.Be understood that the present invention can have various variations different in form, its neither departing from the scope of the present invention, and explanation wherein and accompanying drawing and the Reference numeral usefulness that ought explain in itself, but not in order to restriction the present invention.
The first embodiment of the present invention is shown in Fig. 4.Figure 4 shows that power supply unit 400, it comprises booster type power factor correcting converter 402 and DC/DC convertor circuitry 404.Booster type power factor correcting converter 402 comprises bridge rectifier 410, boost inductance L41, transistor switch S41 and diode D41.Bridge rectifier 410 is set at and is used for input ac voltage Vin is rectified into the commutated direct current pressure with a scheduled voltage.Boost inductance L41 is coupled to an output of bridge rectifier 410, it is set in order to receiving the electric current that this bridge rectifier 410 is exported, and switches wherein according to the switch of transistor switch S41 that energy stored is released into the output capacitive unit Cb with capacitive impedance via diode D41.Transistor switch S41 is driven by power factor correcting signal (PFC signal) Vg.Switch by transistor switch S41 switches, boost inductance L41 with self stored energy to output capacitive unit Cb charging, thereby on output capacitive unit Cb, produce the direct voltage (intermediate DC voltage) of a transition.This DC-to-DC converter 404 is connected with booster type power factor correcting converter 402 via output capacitive unit Cb, it is set at the direct voltage that receives this transition from output capacitive unit Cb, and converts the direct voltage of this transition the output dc voltage of required voltage value to offer the load (not shown).
In Fig. 4, in order to reduce the ripple current that flows into Cb, one act as ripple attenuation device by the inductive filter unit with inductive impedance (inductive filtering unit with an inductive impedance) Lr with capacitive character filter unit (the capacitive filtering unit with a capacitiveimpedance) resonant network (resonant network) 412 that Cr formed with capacitive impedance, and it is arranged between booster type power factor correcting converter 402 and the DC-to-DC converter 404 and with output capacitive unit Cb and couples.Resonant network 412 is filter (filter), and wherein Cr has less equivalent series resistance (equivalent series resistance, high frequency capacitance ESR).Cr is coupled between booster type power factor correcting converter 402 and the output capacitive unit Cb and is in parallel with output capacitive unit Cb, and inductive filter unit Lr is coupled between capacitive character filter unit Cr and the output capacitive unit Cb.Resonant network 412 is set at the alternating current that allows low frequency and flows into output capacitive unit Cb, and will flow into the high frequency ripple electric current minimizing of output capacitive unit Cb.
The circuit operation principle of Fig. 4 is described as follows.When transistor switch S41 conducting, boost inductance L41 receives alternating current that this bridge rectifier 410 exported and storage power in wherein.When transistor switch S41 closes, boost inductance L41 can discharge the mode of storage energy wherein with outputting inductance electric current I L, wherein Yi Bufen inductive current offers the DC-to-DC converter 404 of back level, and the inductive current of another part flows into resonant network 412 and output capacitive unit Cb.Because the equiva lent impedance of capacitive character filter unit Cr is low, can attract bigger electric current shunting to flow into capacitive character filter unit Cr, and the equiva lent impedance height on the circuit branch that inductive filter unit Lr and output capacitive unit Cb are formed, therefore the electric current branch that flows into fails to be convened for lack of a quorum smaller.Thus, the ripple current of output capacitive unit Cb can reduce effectively, and the high frequency ripple voltage of output capacitive unit Cb also can reduce simultaneously, and the voltage ripple of the DC-to-DC converter 404 of level is significantly reduced after making.
If want to reach effective ripple attenuating, the parameter setting of resonant network 412 must be done suitable selection.Fig. 5 show Lr at different inductance value L1 and Cr under the selection of different capacitance C1, the variation situation of the ripple current effective value of output capacitive unit Cb.As seen from Figure 5, when the set point of inductance value L1 and capacitance C1 is big (corresponding to the regional A of Fig. 5), the resonance frequency of resonant network f 1 = 1 2 · π · L 1 · C 1 Can be lower than minimum switching frequency, and the ripple current effective value of output capacitive unit Cb can be lower than under inductance value L1 is 0 situation the ripple current effective value of the output capacitive unit Cb of (corresponding to the area B of Fig. 5, it is equal to the example of circuit design of the known technology of Fig. 1).And when the set point of L1 and C1 dropped on zone C, the ripple current effective value of output capacitive unit Cb will be very big.Fig. 6 (A) and Fig. 6 (B) are emulation testing figure of the present invention, it is presented under the situation of parameter value of suitable setting resonant network respectively and does not suitably set under the situation of parameter value of resonant network the diode current ID of the diode D41 that flows through and the ripple current waveform of output capacitive unit Cb.
Fig. 7 (A) and Fig. 7 (B) are experimental data figure of the present invention, and its power output at power factor correcting converter 402 is to test the result of gained under 90W and the example that adopts critical continuous current-mode to drive.The capacitance that Fig. 7 (A) legend is presented at Cb is the capacitance of the inductance value of 36uF and Lr and Cr when being respectively 0uH and 1uF, and the ripple current of Cb is 0.65A.The capacitance that Fig. 7 (B) legend is presented at Cb is the capacitance of the inductance value of 36uF and Lr and Cr when being respectively 15uH and 1uF, and the ripple current of Cb can reduce to 0.27A.When circuit working under interrupted or continuous pattern, adopt this structure, the output capacitance ripple current also can significantly reduce.
Fig. 8 shows the circuit structure diagram of the second embodiment of the present invention.In Fig. 8, inductive filter unit (being shown as inductance L r in this figure) is to connect with output capacitive unit (being shown as capacitor C b in this figure), therefore inductive filter unit Lr not only can reduce from prime power factor correcting converter 402 caused ripple currents with the resonant network that capacitive character filter unit Cr is formed, and can also reduce from back grade DC-to-DC converter 404 caused ripple currents.
Fig. 9 shows the circuit structure diagram of the third embodiment of the present invention.The circuit structure of Fig. 9 is that the inductive filter unit Lr with Fig. 4 forms in the mode of centre tap (central-tapping) and gets.Therefore in Fig. 9, the inductive filter unit is formed with tap inductance (tap inductor) Lr1 and Lr2, and wherein the first tap inductance L r1 is coupled between capacitive character filter unit Cr and the output capacitive unit Cb, and the second tap inductance L r2 connects with Cb.The circuit structure of Fig. 9 not only combines the advantage of first and second embodiment, and can allow the position of inductance tap to select to carry out design optimization according to different inductance parameters.In the possible form of implementation of another kind, the tap inductance can adopt coupling inductance (coupled inductor) to replace.
Figure 10 shows the circuit structure diagram of the fourth embodiment of the present invention.The resonant network of Figure 10 also can be used to reduce from the ripple current of the power factor correcting converter 402 of prime and from the ripple current of the DC-to-DC converter 404 of back level.Resonant network shown in Figure 10 comprises capacitive character filter unit Cr, is coupled between DC-to-DC transformer 404 and the output capacitance Cb and in parallel with output capacitive unit Cb; The first inductive filter unit L101 is coupled between capacitive character filter unit Cr and the output capacitive unit Cb; And the second inductive filter unit L102, Cr connects with the capacitive character filter unit.Utilize the resonant network structure of Figure 10, the first inductive filter unit L101 can form a low-impedance current path with the circuit branch that the second inductive filter unit L102 and capacitive character filter unit Cr are formed, it can reduce the ripple current from the power factor correcting converter 402 of prime, and the circuit branch that the second inductive filter unit L102 and capacitive character filter unit Cr are formed can form a low-impedance current path, and it can reduce the ripple current from the DC-to-DC converter 404 of back level.By the design standard of this kind circuit structure, the ripple current that flows into output capacitive unit Cb can significantly reduce.
Comprehensive the above, the present invention designs a kind of ripple attenuation device that is arranged between prime power factor correcting converter and the back level DC-to-DC converter and couples mutually with output capacitance, its structural arrangements is the resonant network of being made up of inductance and electric capacity, this resonant network can carry out Filtering Processing to the electric current that flows into output capacitance, and then reduces the ripple current of output capacitance.Utilize ripple decay technique of the present invention, can under the condition of the capacity cell that does not need to increase large volume, effectively reduce the ripple current in the power supply unit, thereby can reduce the voltage ripple of circuit and increase the reliability of power supply unit.
The present invention can be appointed by those skilled in the art and executes that the craftsman thinks and be to modify as all, the scope of right neither disengaging claims institute desire protection.

Claims (15)

1. power supply unit, it comprises:
The prime power supply changeover device, it is set in order to receive the input power supply and will import the power supply that power source conversion becomes transition;
Output capacitive unit with capacitive impedance is coupled to this prime power supply changeover device, and it is in order to produce the power supply of this transition;
Back level power supply transducer, it is set at the out-put supply that also power supply of this transition is converted to the required voltage value in order to the power supply that receives this transition; And
Resonant network is arranged between this prime power supply changeover device and this back level power supply transducer and with this output capacitive unit and couples mutually, and its electric current that is set at flowing into this output capacitive unit carries out Filtering Processing.
2. power supply unit according to claim 1 is characterized in that, this prime power supply changeover device is a power factor correcting converter, and this back level power supply transducer is a DC-to-DC converter.
3. power supply unit according to claim 1 is characterized in that, this resonant network comprises:
Capacitive character filter unit with capacitive impedance is coupled between this prime power supply changeover device and this output capacitive unit and in parallel with this prime power supply changeover device; And
Inductive filter unit with inductive impedance is coupled between this capacitive character filter unit and this output capacitive unit, and wherein this output capacitive unit is in parallel with this back level power supply transducer.
4. power supply unit according to claim 3 is characterized in that, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this inductive filter unit is an inductance.
5. power supply unit according to claim 1 is characterized in that, this resonant network comprises:
Capacitive character filter unit with capacitive impedance is coupled between this prime power supply changeover device and this output capacitive unit and in parallel with this prime power supply changeover device; And
Inductive filter unit with inductive impedance is connected with this output capacitive unit;
Wherein this inductive filter unit is in parallel with this prime power supply changeover device and this back level power supply transducer with the series loop of this output capacitive unit.
6. power supply unit according to claim 5 is characterized in that, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and the inductive filter unit is an inductance.
7. power supply unit according to claim 1 is characterized in that, this resonant network comprises:
Capacitive character filter unit with capacitive impedance is coupled between this prime power supply changeover device and this output capacitive unit and in parallel with this prime power supply changeover device;
Have the first inductive filter unit of inductive impedance, connect with this output capacitive unit; And
The second inductive filter unit with inductive impedance is coupled between this capacitive character filter unit and this first inductive filter unit and the loop that output capacitive unit is connected;
Wherein this output capacitive unit loop of connecting with this first inductive filter unit is in parallel with this back level power supply transducer.
8. power supply unit according to claim 7 is characterized in that, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this first inductive filter unit and the second inductive filter unit are inductance.
9. power supply unit according to claim 7, but this first inductive filter unit and this second inductive filter unit organization center tap inductance.
10. power supply unit according to claim 1 is characterized in that, this resonant network comprises:
Capacitive character filter unit with capacitive impedance is coupled between this back level power supply transducer and this output capacitive unit;
The first inductive filter unit with inductive impedance is connected with this capacitive character filter unit; And
The second inductive filter unit with inductive impedance is coupled between the series loop and this output capacitive unit of this capacitive character filter unit and the first inductive filter unit;
Wherein this first inductive filter unit loop of connecting with this capacitive character filter unit is in parallel with this back level power supply transducer, and this output capacitive unit is in parallel with this prime power supply changeover device.
11. power supply unit according to claim 10 is characterized in that, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this first inductive filter unit and the second inductive filter unit are inductance.
12. ripple attenuation device, be used for power supply unit, this power supply unit is made up of prime power supply changeover device and back level power supply transducer, this ripple attenuation device is coupled to the ripple current of the output capacitive unit between this prime power supply changeover device and this back level power supply transducer in order to minimizing, and this ripple attenuation device comprises:
Resonant network is arranged between this prime power supply changeover device and this back level power supply transducer and with this output capacitive unit and couples mutually, and its electric current that is set at flowing into this output capacitive unit carries out Filtering Processing.
13. ripple attenuation device according to claim 12 is characterized in that, this resonant network comprises the capacitive character filter unit with capacitive impedance at least and has the inductive filter unit of inductive impedance.
14. ripple attenuation device according to claim 13 is characterized in that, this capacitive character filter unit is a high frequency capacitance, and this output capacitive unit is an electrochemical capacitor, and this inductive filter unit is an inductance.
15. ripple attenuation device according to claim 13 is characterized in that, this prime power supply changeover device is a power factor correcting converter, and this back level power supply transducer is a DC-to-DC converter.
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WO2009106006A1 (en) * 2008-02-27 2009-09-03 华为技术有限公司 Method and device for antenna feeder adaptation
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CN101951138B (en) * 2009-07-08 2013-04-17 三垦电气株式会社 Power factor correction circuit
CN102661790A (en) * 2012-05-09 2012-09-12 中国科学院上海技术物理研究所 Design method for photovoltaic detector bias voltage circuit based on capacitive transimpedence amplifier (CTIA) readout circuit
CN103986317A (en) * 2014-05-29 2014-08-13 深圳市英可瑞科技开发有限公司 Filter circuit with power frequency output
CN104201878A (en) * 2014-09-03 2014-12-10 山东超越数控电子有限公司 Design method for optimizing filter to suppress switching noise
WO2016176917A1 (en) * 2015-05-07 2016-11-10 中兴通讯股份有限公司 Input self-adaptive switching power supply
CN113946199A (en) * 2020-07-15 2022-01-18 台达电子企业管理(上海)有限公司 Power supply system

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