CN104079160A - Valley filling circuit - Google Patents
Valley filling circuit Download PDFInfo
- Publication number
- CN104079160A CN104079160A CN201410273624.0A CN201410273624A CN104079160A CN 104079160 A CN104079160 A CN 104079160A CN 201410273624 A CN201410273624 A CN 201410273624A CN 104079160 A CN104079160 A CN 104079160A
- Authority
- CN
- China
- Prior art keywords
- diode
- capacitor
- circuit
- electric capacity
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003985 ceramic capacitor Substances 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 137
- 238000007600 charging Methods 0.000 abstract description 13
- 230000005284 excitation Effects 0.000 description 19
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 9
- 238000012937 correction Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 238000013459 approach Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Rectifiers (AREA)
Abstract
The invention discloses a valley filling circuit. A third capacitor C3 is connected to a charging diode D3 in an existing valley filling circuit in parallel, and therefore the withstand voltage of the third capacitor C3 is half the peak value of the input pulsating direct current, and the high-frequency ripple current of a back-stage switching power supply 300 can be fully and effectively absorbed. Due to the fact that the third capacitor does not directly discharge to a load 300, the power factor of the valley filling circuit is large, no high-voltage capacitor which is high in cost and large in size is needed, the capacity value of the third capacity is easy to obtain, and no average striking is needed.
Description
Technical field
The present invention relates to rectifying and wave-filtering field, particularly use and fill out paddy circuit between rectification circuit and reverse exciting switching voltage regulator circuit.
Background technology
Industrial and civilianly all often the alternating voltage of various electrical networks need to be become to direct current, or even the direct current of isolation, along with the further requirement of national standard to the power factor of electrical appliance, at present, Switching Power Supply more than consumed power 75W is had to power factor requirement, require the operating current waveform fundamental sum voltage waveform of circuit identical.
At present existing circuit of power factor correction addresses this problem, and circuit of power factor correction, referred to as pfc circuit, is the abbreviation of Power Factor Correction.
Note: 75W, data from CNS GB17625.1-1998, is called Harmonic Current Limits (the every phase input current≤16A of equipment) the > > that < < low-voltage electrical and electronic equipment send.
Traditional BOOST power factor corrector has solved this problem well, its operation principle can be referring to the principle and the 190th page, 191 pages of design > >, this book ISBN 7-121-00211-6 of the < < Switching Power Supply of Electronic Industry Press.
Speak by the book, power factor refers to the ratio of input active power and input apparent power; Traditional power factor corrector is also divided into passive and active two kinds, and Active Power Factor Correction (APFC:Active Power Factor Correction) is used widely at present, and PPFC (Passive Power Factor Correction) also has two kinds of methods:
The first, in commutating circuit, seal in inductance, when alternating current voltage approaches peak value, the time width of charging current (pulsewidth) broadens, domestic computer power supply adopts this method more, mostly the ATX computer power supply of producing as Great Wall, Hang Jiadeng company is this scheme, and its shortcoming is power factor want some doing, generally below 0.85;
The second, adopt valley fill type circuit of power factor correction, be called for short and fill out paddy circuit, this method is proposed in 1988 by this Osuald Spengler (Spangler), referring to 200 parts in Fig. 1, wherein capacitor C 1 is identical with capacitor C 2 performance parameters, the general electric capacity that adopts same model, certainly, different model, its capacity is substantially identical, be that capacity differs less than 20%, also be considered as performance parameter identical, diode D1 is identical with the performance parameter of diode D2, its principle is: after initial charge, when the alternating voltage of input approaches peak value, to capacitor C 1, capacitor C 2 chargings, after alternating current pressuring meridian rectification circuit 101, cathode output end (figure acceptance of the bid+) output from rectification circuit 101, electric current is through capacitor C 1, diode D3, capacitor C 2 is returned to the cathode output end (in figure-) of rectification circuit 101, realization is to capacitor C 1, the charging of capacitor C 2.
When electric discharge, capacitor C 1 and capacitor C 2 are equivalent parallel electric discharges, and the discharging current of capacitor C 1 is got back to the negative pole of capacitor C 1 through load RL, diode D1, and meanwhile, the discharging current of capacitor C 2 flow back into the negative pole of capacitor C 2 through diode D2, load RL.In Fig. 1, when load RL is pure resistive load, the work wave that W is ordered, i.e. the operating voltage waveform of load RL, as shown in Figure 2, with input voltage U
aCfor 220V AC value is example, the cycle that wherein T is alternating current is 20mS.In Fig. 2, dotted line is the rear voltage waveform without any filter circuit of rectification circuit 101, is Rectified alternating current, and minimum operating voltage is zero volt.Rectification circuit 101 is real is full-bridge, is again bridge rectifier, rectifier bridge, generally four rectifier diodes, consists of, and Fig. 4-1, Fig. 4-2, Fig. 4-3 in the mandate description of the invention of application number 201210056555.9 have provided several known technique of painting of rectifier bridge.
Fill out paddy circuit 200 and exactly the trough that approaches zero volt in Rectified alternating current is filled out, in Fig. 1, by capacitor C 1 and capacitor C 2 parallel discharges, completed this function, fill out paddy circuit and therefore gain the name.
Nineteen ninety, the special Pehanorm of base (KitSum) has improved fills out paddy circuit, and computer simulation result shows that power factor can reach 98%, and has applied for patent, sees US publication US6141230A.
Fill out paddy circuit extremely wide in application before, even now, in the product of this circuit below 75W, its low-cost solution is very potential, and the original paddy circuit arrangement of filling out has been applied a lot of years in this respect.It is one can not be ignored, the solution of reasonable, cheap, practicability and effectiveness.
Fill out the shortcoming of paddy circuit also clearly, especially when the load of rear class is Switching Power Supply.Larger owing to filling out the voltage fluctuation of paddy circuit output, as shown in Figure 2, when load current is minimum, crest voltage is 2 times of discharge platform voltage in paddy, so, the Switching Power Supply of general its rear class can be selected inverse-excitation type switch power-supply, and this is that other Switching Power Supply that can bear wide range input voltage is also fine because inverse-excitation type switch power-supply ratio is easier to input voltage to make wide-voltage range.
Referring to Fig. 3, when the half of the AC-input voltage of inputting lower than peak-peak, capacitor C 1 and capacitor C 2 are parallel discharges, reverse exciting switching voltage regulator circuit 300 power supplies to rear class, note, the reverse exciting switching voltage regulator circuit 300 here does not comprise rectification, filter circuit, is only the basic topology of the DC/DC of reverse exciting switching voltage regulator, the reverse exciting switching voltage regulator circuit 300 of basic topology is designated hereinafter simply as circuit of reversed excitation, with 300 expressions.
At this moment the high frequency ripple that circuit of reversed excitation 300 produces is by capacitor C 1 and capacitor C 2 absorption in parallel, and At All Other Times, when the half of the AC-input voltage of inputting higher than peak-peak, diode D1 and D2 are in cut-off state, at this moment the high frequency ripple electric current that circuit of reversed excitation 300 produces cannot be absorbed by capacitor C 1 and capacitor C 2, the EMI performance extreme difference of circuit, EMI is Electromagnetic Interference, is called for short EMI.The problem that cannot be fully absorbed for solving the high frequency ripple electric current of circuit of reversed excitation 300 generations, existing common way is the direct high frequency in parallel of front end at circuit of reversed excitation 300, the little electric capacity of high pressure, capacitor C L as shown in Figure 4.At open source information, if the paper < < of < < power technology application > > the 8th phase in 2009 is based on filling out in the design > > of constant current mode LED high drive power supply of paddy circuit, be exactly and go up electric capacity C5, its capacity is withstand voltage is 100n/400V, be 0.1uF/400V electric capacity, this article numbering: 0219-2713 (2009) 08-0027-05, and author is Sha Zhanyou, horse turbulent waves;
In May, 2011 China application number: the C3 in 201120178756.7 < < high power factor valley fill circuit > >;
In May, 2012 US publication US2013207567 < < Boost converter assisted valley-fill power factor correction circuit > > in electric capacity 117;
Capacitor C 4 in the LED power supply > > of the < < High Power Factor of in July, 2012 China application number: 201210246771.X;
In July, 2012 China application number: the capacitor C 5 in 201210266444.0 < < LED power supply circuits > >;
As above the technical scheme that data is recorded is all to adopt in this way, and, at the little electric capacity of the direct high frequency in parallel in the two ends of this rear class load of reverse exciting switching voltage regulator circuit, high pressure, it is equivalent to the capacitor C L in Fig. 4.
The obtaining value method of capacitor C L is: under the operating frequency of Switching Power Supply, its capacitive reactance be less than exchange the circuit of reversed excitation 300 under input minimum voltage equivalent input direct-current impedance 1/10th, be greater than transformer efficiency winding DC impedance and main power tube R in reverse exciting switching voltage regulator circuit
ds (ON)and current sense resistor sum.
The weak point of shunt capacitance CL is that the operating voltage of capacitor C L is high; The capacity of capacitor C L is large, and owing to there is filter action, the power factor that makes the tradition shown in Fig. 4 fill out paddy circuit 200 declines; The capacity of capacitor C L is little, and the high frequency ripple current absorption that the circuit of reversed excitation 300 of rear class produces is not obvious, causes the conversion efficiency (η) of inverse-excitation type switch power-supply circuit to decline, and external differential mode conducted interference is very large; Because capacitor C L wants absorbing high-frequency ripple, if adopt higfh-tension ceramics electric capacity, because higfh-tension ceramics electric capacity exists piezoelectric effect, operating voltage is higher, and capacity is just less, need to be with the very large electric capacity of capacity, cost is high, volume is large, if adopt the high-voltage capacitance of similar CBB (polypropylene capactive), same, cost is high, and volume is large.
Adopt the deficiency of this existing shunt capacitance CL of Fig. 4 to be summarized as follows:
(1) operating voltage of capacitor C L is high, absorbing high-frequency ripple current, causes that volume is large, cost is high;
(2) capacity value is large, causes the power factor of filling out paddy circuit to decline; Capacity value is little, and high frequency ripple current absorption is not obvious, is difficult to compromise.
Summary of the invention
In view of this, the present invention will solve the existing deficiency that paddy circuit exists of filling out, a kind of paddy circuit of filling out is provided, while coordinating inverse-excitation type switch power-supply work, do not need high, the bulky high-voltage capacitance of cost, circuit application is simple, very little on power factor impact, and circuit is when design, and capacity value is easy, without compromise.
The object of the present invention is achieved like this, a kind of paddy circuit of filling out, be used for being connected between prime rectification circuit and rear class inverse-excitation type switch power-supply circuit, comprise the first electric capacity and the first diode, the positive pole of described the first electric capacity connects the cathode output end of rectification circuit, the negative pole of described the first electric capacity connects the negative electrode of the first diode, the cathode output end of the anodic bonding rectification circuit of described the first diode; The second electric capacity and the second diode, the negative pole of described the second electric capacity connects the anode of the first diode of rectification circuit, and the positive pole of described the second electric capacity connects the anode of the second diode, and the negative electrode of described the second diode connects the positive pole of the first electric capacity; The 3rd diode, the negative pole of anodic bonding first electric capacity of described the 3rd diode, the negative electrode of described the 3rd diode connects the positive pole of the second electric capacity, wherein, described the first electric capacity is identical with the performance parameter of described the second electric capacity, and described the first diode is identical with the performance parameter of described the second diode, also comprises the 3rd electric capacity, one end of the 3rd electric capacity is connected with the negative pole of the first electric capacity, and the other end of the 3rd electric capacity is connected with the positive pole of the second electric capacity.
Preferably, also comprise the first resistance, described the first resistance is connected with the 3rd described diode, and the rear two-terminal devices forming of series connection substitutes described former the 3rd diode, and the direction of the 3rd diode described in keeping is constant.
Preferably, described the 3rd electric capacity is chip ceramic capacitor.
The beneficial effect of filling out paddy circuit of the present invention is:
The operating voltage of (1) the 3rd electric capacity is low, so volume is little, cost is low;
(2) capacitance value very much not causes that the power factor of filling out paddy circuit declines, and capacitance value is easy.
Accompanying drawing explanation
Fig. 1 is the existing application principle figure that fills out paddy circuit;
Fig. 2 is existing operating voltage oscillogram of filling out paddy circuit;
Fig. 3 is the existing schematic diagram of filling out the inverse-excitation type switch power-supply circuit of paddy circuit band rear class;
Fig. 4 be existing fill out paddy circuit for adaptive inverse-excitation type switch power-supply circuit the schematic diagram of shunt capacitance CL;
Fig. 5 is the schematic diagram of filling out paddy circuit of first embodiment of the invention;
Fig. 6 is the schematic diagram of filling out paddy circuit of second embodiment of the invention;
Fig. 7 is the actual measurement operating current waveform of second embodiment of the invention.
Embodiment
the first embodiment
What Fig. 5 showed the first embodiment fills out paddy circuit theory diagrams, and a kind of paddy circuit 201 of filling out, for being connected between rectification circuit 101 and circuit of reversed excitation 300, comprises
The first capacitor C 1 and the first diode D1, the positive pole of the first capacitor C 1 connects the cathode output end of prime rectification circuit, and the negative pole of the first capacitor C 1 connects the negative electrode of the first diode D1, the cathode output end of the anodic bonding prime rectification circuit of the first diode D1;
The second capacitor C 2 and the second diode D2, the negative pole of the second capacitor C 2 connects the anode of the first diode D1, and the positive pole of the second capacitor C 2 connects the anode of the second diode D2, and the negative electrode of the second diode D2 connects the positive pole of the first capacitor C 1;
The 3rd diode D3, the negative pole of anodic bonding the first capacitor C 1 of the 3rd diode D3, the negative electrode of the 3rd diode D3 connects the positive pole of the second capacitor C 2;
One end of the 3rd capacitor C 3, the three electric capacity is connected with the negative pole of the first capacitor C 1, and the other end of the 3rd electric capacity is connected with the positive pole of the second capacitor C 2.The 3rd capacitor C 3 is parallel to the two ends of the 3rd diode D3;
For convenient, below the first capacitor C 1 referred to as capacitor C 1, other is identical, if the second diode D2 is referred to as diode D2;
Wherein, capacitor C 1 is identical with the performance parameter of capacitor C 2, generally adopts the electric capacity of same model, certainly, different model, its capacity is substantially identical, and capacity differs less than 20% and is also fine, and is also considered as performance parameter identical; Diode D1 is identical with the performance parameter of diode D2.
This operation principle of filling out paddy circuit 201 is:
After initial charge, when input ac voltage approaches voltage peak, to capacitor C 1, capacitor C 2 and capacitor C 3 chargings, after alternating current pressuring meridian rectification circuit 101, cathode output end output from rectification circuit 101, electric current returns to the cathode output end of rectification circuit 101 through capacitor C 1, diode D3 and capacitor C 3, capacitor C 2, realize capacitor C 1, capacitor C 2 and capacitor C 3 are charged.Because capacitor C 3 and diode D3 are relations in parallel, the terminal voltage of capacitor C 3 can only be charged to the forward conduction voltage drop of diode D3, is generally between 0.45V to 1.2V, and in this process, diode D1 and D2 are in cut-off state, and capacitor C 3 is upper just lower negative.Diode D3 only works in charging process, therefore named charging diode.
When dropping to half of voltage peak, alternating voltage discharges when following, the discharging current that is capacitor C 1 is got back to the negative pole of capacitor C 1 through circuit of reversed excitation 300, diode D1, meanwhile, the discharging current of capacitor C 2 flow back into the negative pole of capacitor C 2 through diode D2, circuit of reversed excitation 300.
When electric discharge, capacitor C 1 and capacitor C 2 are equivalent parallel electric discharges, capacitor C 1 and capacitor C 2 equivalent parallels carry out reverse charging to capacitor C 3 simultaneously, in this process, diode D1 and D2 are in conducting state, the upper terminal A of capacitor C 3 (one end being connected with the anode of diode D3) is clamped to the output negative pole current potential of rectification circuit 101 by diode D1, current potential differs the conduction voltage drop of a diode D1, the lower terminal B of capacitor C 3 (another terminal being connected with the negative electrode of diode D3) is clamped to the output cathode current potential of rectification circuit 101 by diode D2, current potential differs the conduction voltage drop of a diode D2, be capacitor C 3 be upper negative under just, being equivalent to capacitor C 1 and capacitor C 2 is that equivalent parallel charges to capacitor C 3.Diode D1 and D2 are equivalent parallels when electric discharge, are called discharge diode.
As from the foregoing, no matter how the terminal voltage of capacitor C 3 changes, in filling out the overall process of paddy circuit 201 charge and discharge, the capacitor C 3 that is parallel to diode D3 two ends and capacitor C 1, capacitor C 2 be filtering high-frequency harmonic composition fully effectively, adopt at the two ends of diode D3 shunt capacitance C3, with replace be arranged at rear class circuit of reversed excitation 300 front ends high-frequency filter capacitor CL fill out paddy circuit, realized the High frequency filter function of the capacitor C L that is arranged at rear class circuit of reversed excitation 300 front ends in available circuit.
Again because the working method of capacitor C 3 in filling out the charge and discharge process of paddy circuit 201 is, charging process: in the forward conduction voltage drop of diode, the terminal voltage of capacitor C 3 is upper just lower negative by diode D3 clamper; Discharge process: the upper terminal A of capacitor C 3 is clamped to the output negative pole current potential of rectification circuit 101 by diode D1, current potential differs the conduction voltage drop of a diode D1, the lower terminal B of capacitor C 3 is clamped to the output cathode current potential of rectification circuit 101 by diode D2, current potential differs the conduction voltage drop of a diode D2, the terminal voltage of capacitor C 3 be upper negative under just.The electric energy consuming in the mode of operation of polarity upset due to capacitor C 3 is by capacitor C 1 and capacitor C 2 electric discharge gained, not directly circuit of reversed excitation 300 electric discharges to rear class load, and it is such to be different from prior art capacitor C L, become the directly filter capacitor to 300 electric discharges of rear class circuit of reversed excitation, so of the present invention, fill out paddy circuit 201 and improved power factor.
Because capacitor C 3 is parallel to the two ends of diode D3, in filling out the charge and discharge overall process of paddy circuit 201, respectively by diode D1, D2, D3 clamper, and without directly bearing full voltage (crest voltage of input Rectified alternating current equals 2 times of the radical signs of input AC electricity effective value).The ceiling voltage that after clamper, capacitor C 3 may be born equals the ceiling voltage of capacitor C 1 or capacitor C 2, be half of crest voltage of input Rectified alternating current, it is the electric capacity over half of the crest voltage of input Rectified alternating current that capacitor C 3 can directly adopt withstand voltage, just can meet the security reliability requirement that this fills out paddy circuit 201 completely.With respect to capacitor C L in available circuit, the withstand voltage of capacitor C 3 has reduced half.The withstand voltage of electric capacity reduces half, has expanded the type selecting scope of capacitor element, volume also significantly dwindles, and has increased the convenience of device buying, and can reduce purchase cost, also helps the impact of electric parameter discreteness on side circuit that reduces electronic devices and components.Because the volume of capacitor element also reduces greatly, be more conducive to the realization of circuit product Miniaturization Design.
The inverse-excitation type switch power-supply that the 220VAC of now take turns 12VDC/40W is example, by the data of surveying, effect of the present invention is described:
Model machine one: adopt the filtering of 68uF/400V electrochemical capacitor after rectification;
Model machine two: adopt after rectification shown in existing Fig. 1 and fill out paddy circuit, capacitor C 1 and C2 are 33uF/250V electrochemical capacitor, and diode D1 to D3 is 1N4007; RL is replaced by circuit of reversed excitation 300;
Model machine three: adopt after rectification shown in existing Fig. 4 and fill out paddy circuit, capacitor C 1 and C2 are 33uF/250V electrochemical capacitor, and diode D1 to D3 is 1N4007; Capacitor C L is 0.33uF/400V, has selected CBB thin-film capacitor;
Model machine four: what adopt first embodiment of the invention after rectification fills out paddy circuit, sees Fig. 5, and capacitor C 1 and C2 are 33uF/250V electrochemical capacitor, and diode D1 to D3 is 1N4007; The thin-film capacitor that capacitor C 3 is 0.33uF/200V, volume is 18mm * 14.5mm * 8.5mm;
Model machine five: what adopt first embodiment of the invention fills out paddy circuit, sees Fig. 5, and capacitor C 1 and C2 are 33uF/250V electrochemical capacitor, and diode D1 to D3 is 1N4007; The CBB thin-film capacitor that capacitor C 3 is 0.47uF/200V.Volume is 18mm * 17.5mm * 9.0mm.
The main power stage of such scheme is all same circuit of reversed excitation 300, adopt this sheet integrated circuit of NCP1234, peripheral circuit adopts the standard recommendation circuit on its handbook, drive the metal-oxide-semiconductor of the 10A/600V that model is IPA60R380C6, transformer primary side inductance value is 430uH, the number of turn is 54 circles, wire diameter is 0.40mm bifilar and around, minutes three layers; Secondary is 8 circles, and it is bifilar and around, the Schottky diode that output rectifying tube is 20A/100V that wire diameter is 0.80mm, and model is 100V/20A D2PAK, and magnetic core adopts ER2812 standard items.
Through testing under same test condition, test power used and count WT210, show that following prior art and the present invention fill out the test data contrast table of paddy circuit 201:
Prior art and the present invention fill out the test data contrast table of paddy circuit
As shown above,
Model machine one: power factor is low is only 0.45;
Model machine two: because there is no high-frequency filter capacitor CL, power factor has been up, but efficiency got off, under fall to 86%, dropped 2%.
Model machine three: improved model machine two, power factor drops to 0.81 from 0.92, and the capacitor C L that main cause is and gets on, has affected and filled out paddy circuit 200.
Model machine four: what adopt first embodiment of the invention fills out paddy circuit, and power factor is still 0.92, and efficiency is 89.3%.
Model machine five: on the basis of model machine four, further strengthened capacitor C 3, power factor is still 0.92, efficiency is 89%, strengthening as seen capacitor C 3 affects and can ignore power factor.
Visible, after improvement, fill out the relatively existing paddy circuit 200 of filling out of paddy circuit 201, aspect power factor, by original 0.81, be promoted to 0.93.Capacitor C 3 is enlarged to 0.47uF from 0.33uF, and this is filled out to the power factor PF of paddy circuit 201 and the impact of efficiency value η is less, and, when circuit design, the value of capacitance is easy, without compromise, processes.
In fact, in special environment, under the low temperature of-40 ℃, be difficult to obtain, and reliability is very low owing to being operated in the electrochemical capacitor of the low temperature of-40 ℃, capacitor C 1 and C2 can adopt non-polar electric capacity to substitute, and are applied in low power power-supply system.Capacitor C 1 and C2 are as adopted CBB thin-film capacitor, and as the electric capacity of 2.2uF/250V, the power of Switching Power Supply is in 3W left and right.At this moment, when application, first define the terminal of capacitor C 1 and C2, as, the positive pole of the corresponding electric capacity of the first terminal, the negative pole of the corresponding electric capacity of the second terminal, implements the present invention like this.
C1, below 1/10 of C2 capacitance are held in capacitor C 3 capacitance power takings, the volume of electric capacity is smaller, can type selecting scope wide, is conducive to the realization of product Miniaturization Design, and be conducive to reduce the impact that components and parts discreteness is manufactured filling out paddy circuit, also help control purchase cost.
The cost of chip ceramic capacitor is low, and volume is little, for capacitor C 3, realize equally goal of the invention, above-mentioned model machine four and five, substitutes with the 224/200V and the 334/200V that are encapsulated as 1812 respectively, and measured performance is constant, realize equally goal of the invention, but volume significantly reduces, above-mentioned chip ceramic capacitor be encapsulated as 1812 standard paster parts, be of a size of 4.5mm * 3.2mm, thickness is only 1.8mm, is conducive to the realization of automatic welding processing.
the second embodiment
Fig. 6 shows the circuit theory diagrams of the second embodiment, a kind of paddy circuit 201 ' of filling out, be with the difference of the first embodiment, also comprise resistance R 1, resistance R 1 is connected with diode D3 and is formed two-terminal devices, this two-terminal devices substitutes the diode D3 in the first embodiment, and keeps the sense of current of diode D3 constant, and charging diode D3 is only constant to the function of capacitor C 1 and C2 charging when alternating current approaches peak value.Resistance R 1 is connected with diode D3, capacitor C 3 is parallel to the two-terminal devices two ends that the first resistance R 1 is connected with the 3rd diode D3 and formed afterwards, the resistance R 1 of connecting with diode D3, in order to improve the pulsewidth of the charging current when the alternating voltage of input approaches peak value, is further improved power factor of the present invention.
Now take above-mentioned model machine four as basis, and the resistance R 1 that seals in addition 10 Europe in diode D3 is made model machine six, and power is 3W.What test showed that the power factor of model machine six records from model machine four 0.92 rises to 0.925.Efficiency only declines 0.1%.
Illustrate: in embodiment bis-, seal in after resistance R 1, the power factor unconspicuous reason that rises, due in an embodiment, rear class load is circuit of reversed excitation 300, load constant timing when circuit of reversed excitation 300, the power of its consumption is also constant, be that operating voltage is when low, operating current is large, Fig. 6 circuit, adopt after above-mentioned device parameters, the operating current waveform of actual measurement input as shown in Figure 7, the current waveform of 400 indications is exactly when alternating current voltage peaking, alternating current passes through diode D3 to capacitor C 1, the charging current waveform of capacitor C 2, obviously, it is wider, 401 indications be exactly that Switching Power Supply directly consumes the current waveform that alternating current produces.
Just because of the total waveform of the consumption shown in Fig. 7 is distortion, so fill out the follow-up load of paddy circuit while being permanent power-type load, as inverse-excitation type switch power-supply, at this moment its power factor is difficult to surpass 0.93.If circuit of reversed excitation 300 is changed into resistor-type load, power factor is expected to be further promoted to 0.95.
In view of original number of devices of filling out paddy circuit only has 5, from original fill out paddy circuit and propose after so far, function and the annexation of each device in circuit do not change always, it is visible that original to fill out paddy circuit model substantially curing, therefore, to original, fill out paddy circuit to carry out improved design space very little.In order to improve power factor, expand the type selecting scope of capacitor element, reduction is because of the impact on the technique effect of theoretical circuit of the discreteness of components and parts, and the above-mentioned improvement technical scheme that inventor proposes, belongs to and break original innovative technology scheme of filling out the intrinsic circuit model of paddy circuit.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention.For those skilled in the art; without departing from the spirit and scope of the present invention; can also make some improvements and modifications; these improvements and modifications also should be considered as protection scope of the present invention; here no longer with embodiment, repeat; as set up piezo-resistance, thermistor, safety electric capacity and inductance in the periphery of filling out paddy circuit, to protect the components and parts of filling out paddy circuit and subsequent conditioning circuit, protection scope of the present invention should be as the criterion with claim limited range.
Claims (3)
1. fill out a paddy circuit, for being connected between rectification circuit and inverse-excitation type switch power-supply circuit, comprise
The first electric capacity and the first diode, the positive pole of described the first electric capacity connects the cathode output end of rectification circuit, and the negative pole of described the first electric capacity connects the negative electrode of the first diode, the cathode output end of the anodic bonding rectification circuit of described the first diode;
The second electric capacity and the second diode, the negative pole of described the second electric capacity connects the anode of the first diode, and the positive pole of described the second electric capacity connects the anode of the second diode, and the negative electrode of described the second diode connects the positive pole of the first electric capacity;
The 3rd diode, the negative pole of anodic bonding first electric capacity of described the 3rd diode, the negative electrode of described the 3rd diode connects the positive pole of the second electric capacity, wherein, described the first electric capacity is identical with the performance parameter of described the second electric capacity, described the first diode is identical with the performance parameter of described the second diode, it is characterized in that:
Also comprise the 3rd electric capacity, one end of described the 3rd electric capacity is connected with the negative pole of the first electric capacity, and the other end of described the 3rd electric capacity is connected with the positive pole of the second electric capacity.
2. the paddy circuit of filling out according to claim 1, it is characterized in that: also comprise the first resistance, described the first resistance is connected with the 3rd described diode, and the rear two-terminal devices forming of series connection substitutes described former the 3rd diode, and the direction of the 3rd diode described in keeping is constant.
3. the paddy circuit of filling out according to claim 2, is characterized in that: described the 3rd electric capacity is chip ceramic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410273624.0A CN104079160B (en) | 2014-06-18 | 2014-06-18 | A kind of valley fill circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410273624.0A CN104079160B (en) | 2014-06-18 | 2014-06-18 | A kind of valley fill circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104079160A true CN104079160A (en) | 2014-10-01 |
| CN104079160B CN104079160B (en) | 2016-09-21 |
Family
ID=51600253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410273624.0A Active CN104079160B (en) | 2014-06-18 | 2014-06-18 | A kind of valley fill circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104079160B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541467A (en) * | 2021-06-29 | 2021-10-22 | 广州金升阳科技有限公司 | High power factor valley filling circuit |
| CN116232045A (en) * | 2023-02-28 | 2023-06-06 | 深圳市国电科技通信有限公司 | PFC circuit, power supply circuit and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060061297A1 (en) * | 2004-09-20 | 2006-03-23 | Patent-Treuhand-Gesellschaft | Circuit arrangement for operating at least one light source |
| CN202221960U (en) * | 2011-06-23 | 2012-05-16 | 江苏浩峰汽车附件有限公司 | Passive PFC circuit |
| EP2600697A1 (en) * | 2010-07-27 | 2013-06-05 | Panasonic Corporation | Load control device |
-
2014
- 2014-06-18 CN CN201410273624.0A patent/CN104079160B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060061297A1 (en) * | 2004-09-20 | 2006-03-23 | Patent-Treuhand-Gesellschaft | Circuit arrangement for operating at least one light source |
| EP2600697A1 (en) * | 2010-07-27 | 2013-06-05 | Panasonic Corporation | Load control device |
| CN202221960U (en) * | 2011-06-23 | 2012-05-16 | 江苏浩峰汽车附件有限公司 | Passive PFC circuit |
Non-Patent Citations (2)
| Title |
|---|
| 侯典立等: ""含有PFC的LED驱动线路的改进设计"", 《电源学报》 * |
| 蒋孝平等: ""填谷式无源PFC在离线LED照明电源中的应用研究"", 《灯与照明》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541467A (en) * | 2021-06-29 | 2021-10-22 | 广州金升阳科技有限公司 | High power factor valley filling circuit |
| CN116232045A (en) * | 2023-02-28 | 2023-06-06 | 深圳市国电科技通信有限公司 | PFC circuit, power supply circuit and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104079160B (en) | 2016-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104079185B (en) | A kind of valley fill circuit of band defencive function | |
| CN102761276B (en) | Step-down type power factor correction (PFC) circuit | |
| CN104682680A (en) | Rectification and filtering method and circuit | |
| CN105527524A (en) | Indication circuit for switch power supply and usage method | |
| CN104578843B (en) | Filter circuit of AC/DC (alternating current/direct current) switching converter | |
| CN201766508U (en) | Single-phase single-pole full-bridge isolated power factor correction converter | |
| CN105811785A (en) | Transformer distribution parameter based LCC resonant type electrostatic precipitator high-frequency high-voltage power supply | |
| CN206389273U (en) | A kind of power supply adaptor | |
| CN106787754A (en) | Intelligent amendment wave voltage change-over circuit based on PFC interleaving inverse excitation full-bridges | |
| CN106208646A (en) | A kind of directly filtering type Switching Power Supply | |
| CN104079160A (en) | Valley filling circuit | |
| CN205491305U (en) | Direct filtering switching power supply | |
| CN111509964A (en) | Three-phase L C series current limiting circuit and method thereof | |
| CN102447403A (en) | Three-phase rectifier circuit with low harmonic wave continuous input current | |
| CN104467430B (en) | Switch power supply circuit | |
| CN203251464U (en) | Electronic ballast for LED downlight | |
| CN102710117B (en) | High-efficiency passive power factor correction circuit | |
| CN203840004U (en) | An intelligent high-efficiency fast charger | |
| CN214014119U (en) | Harmonic Distortion Resistant Power Adapter for Voice Devices | |
| CN212033991U (en) | Three-phase LC series current-limiting circuit | |
| CN104079188B (en) | A kind of inverse-excitation type switch power-supply circuit | |
| CN202121352U (en) | Micro power consumption uninterrupted power source | |
| CN104506033A (en) | Power factor improver circuit with function of PFC (power factor correction) | |
| CN102403889A (en) | High-efficiency passive power factor correction circuit | |
| CN208316590U (en) | A kind of novel LWD host PFC correction regulated power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |