CN104079185B - A kind of valley fill circuit of band defencive function - Google Patents
A kind of valley fill circuit of band defencive function Download PDFInfo
- Publication number
- CN104079185B CN104079185B CN201410274298.5A CN201410274298A CN104079185B CN 104079185 B CN104079185 B CN 104079185B CN 201410274298 A CN201410274298 A CN 201410274298A CN 104079185 B CN104079185 B CN 104079185B
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- circuit
- diode
- varistor
- defencive function
- 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.)
- Active
Links
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
A kind of valley fill circuit of band defencive function; on charging diode D3 in existing valley fill circuit; a 3rd electric capacity C3 in parallel, such 3rd electric capacity C3 is pressure for the half of peak-peak of Rectified alternating current of input, and can substantially effectively inhale the high frequency ripple current of the Switching Power Supply 300 of rear class；And varistor RV1, RV2 are set before and after rectifier bridge 101; critesistor NTC, safety electric capacity C composition and inductance L constitute multistage bidirectional filter circuit, protection circuit; obtain high and C3 the value of power factor and do not affect that power factor, circuit topological structure be simple, the little beneficial effect of the good absorbing effect to surge voltage, low cost, volume; and when rear class is Switching Power Supply, differential mode Conduction Interference degree meets the grade of CLASS B in GB9254.
Description
Technical field
The present invention relates to rectifying and wave-filtering field, particularly to the valley fill circuit of band defencive function in Switching Power Supply.
Background technology
Industrial and civilian needs become the alternating voltage of various electrical networks into direct current, along with the national standard merit to electrical appliance
The further requirement of rate factor, to Switching Power Supply more than power consumption 75W all power factor requirements, i.e. requires the work of circuit
Make current waveform the most identical with voltage waveform.The electricity-saving lamp of more than 5W is proposed power factor command at present.
Note: 75W Data Source is in CNS GB17625.1-1998, and entitled " low-voltage electrical and electronic equipment are sent out
The Harmonic Current Limits (equipment every phase input current≤16A) gone out ".
Having circuit of power factor correction at present and solve this problem, circuit of power factor correction is referred to as pfc circuit, is
The abbreviation of Power Factor Correction.
Traditional BOOST power factor corrector solves this problem the most well, and its operation principle may refer to
" principle of Switching Power Supply and the design " of Electronic Industry Press page 190, page 191, this book ISBN 7-121-00211-6.
Power factor refers to input active power and the ratio of input apparent energy；PFC is divided into passive and has
The big class in source two, APFC (APFC:Active Power Factor Correction) obtains extensively should at present
With, but relatively costly；PPFC also has two kinds of methods:
The first, seal in inductance in commutating circuit, when alternating current voltage is close to peak value, and the time width of charging current
(pulsewidth) broadens, domestic computer power supply this method of many employings, and the ATX produced such as Great Wall, Hang Jiadeng company calculates electromechanics
Mostly source is this scheme, and its shortcoming is power factor want some doing, typically below 0.85；
The second, uses valley fill type circuit of power factor correction, is called for short valley fill circuit, and this method is by this Osuald Spengler
(Spangler) proposing in 1988, see 200 part in Fig. 1, wherein electric capacity C1 is identical, typically with electric capacity C2 performance parameter
Using the electric capacity of same model, certainly, different model, its capacity is substantially the same, i.e. capacity difference also can work less than 20%
Making, the performance parameter that this situation is also considered as electric capacity is identical；Diode D1 is identical with the performance parameter of diode D2.Its principle
For: after initial charge, when the alternating voltage of input is close to peak value, electric capacity C1, electric capacity C2 are charged, i.e. as alternating voltage UAC
After rectified bridge 101, from cathode output end (the figure acceptance of the bid+) output of rectifier bridge 101, electric current is through electric capacity C1, diode D3, electric capacity
C2 returns the cathode output end (in figure-) of rectifier bridge 101, it is achieved to electric capacity C1, the charging of electric capacity C2.
When electric discharge, electric capacity C1 and electric capacity C2 is that equivalent parallel electric discharge, the i.e. discharge current of electric capacity C1 are through load RL, two poles
Pipe D1 returns to the negative pole of electric capacity C1, and meanwhile, the discharge current of electric capacity C2 flow back into the negative of electric capacity C2 through diode D2, load RL
Pole.In Fig. 1, when loading RL and being purely resistive load, the work wave of W point, i.e. load the running voltage waveform of RL, such as Fig. 2 institute
Show, with input voltage UACAs a example by 220V AC value, wherein T is the cycle of alternating current, for 20mS.In Fig. 2, dotted line is whole
Without the voltage waveform of any filter circuit after stream bridge 101, being Rectified alternating current, minimum running voltage is zero volt.Rectifier bridge 101,
Typically be made up of four commutation diodes, application number 201210056555.9 authorize the Fig. 4-1 in description of the invention, Fig. 4-2,
Fig. 4-3 gives several known technique of painting of rectifier bridge.
Valley fill circuit 200 is filled out, trough close to zero volt in Rectified alternating current in Fig. 1, by electric capacity C1 and electric capacity exactly
C2 parallel discharge completes this function, and therefore valley fill circuit gains the name.
Nineteen ninety, base spy's Pehanorm (KitSum) improves valley fill circuit, and Computer simulation results shows that power factor has can
98% can be reached, and applied for patent, see US publication US6141230A.
Valley fill circuit apply before extremely wide, even now, this circuit in the product of below 75W, its low cost
Solution is very promising, and original valley fill circuit scheme applies a lot of year the most in this respect.It is one and does not allows suddenly
Depending on, reasonable, cheap, the solution of practicability and effectiveness.
The shortcoming of existing valley fill circuit is it is also obvious that especially when the load of rear class is Switching Power Supply, see Fig. 3, have
2 point below:
1, EMI poor performance
Owing to the voltage fluctuation of valley fill circuit output is relatively big, as in figure 2 it is shown, when load current is minimum, crest voltage is
2 times of discharge platform voltage in paddy, so, the Switching Power Supply of general following stage can select inverse-excitation type switch power-supply, this be because of
Being easier input voltage to make wide-voltage range for inverse-excitation type switch power-supply, other can bear opening of wide range input voltage
Pass power supply is also possible.
Seeing Fig. 3, when the AC-input voltage of input is less than the half of peak-peak, electric capacity C1 and electric capacity C2 is in parallel
Electric discharge, the reverse exciting switching voltage regulator circuit 300 of rear class is powered, it is noted that reverse exciting switching voltage regulator circuit 300 here does not include whole
Stream, filter circuit, only reverse exciting switching voltage regulator DC/DC basic topology (the reverse exciting switching voltage regulator circuit 300 of basic topology with
It is referred to as down circuit of reversed excitation, represents with 300), the high frequency ripple current that at this moment circuit of reversed excitation 300 produces is by electric capacity C1 and electric capacity C2
Absorption in parallel；And At All Other Times, i.e. when the AC-input voltage of input is higher than the half of peak-peak, diode D1 and D2
Being in cut-off state, the high frequency ripple current that at this moment circuit of reversed excitation 300 produces cannot be absorbed by electric capacity C1 and electric capacity C2, can only
The internal resistance that can cross AC-powered equipment absorbs, and owing to loop is big, the loop of high frequency ripple current is long, and high-frequency loss is also big,
The EMI performance extreme difference of circuit, EMI is Electromagnetic Interference, is called for short EMI.
2, protective value is poor
Seeing Fig. 3, when the AC-input voltage of input is less than the half of peak-peak, electric capacity C1 and electric capacity C2 is in parallel
Electric discharge, the circuit of reversed excitation 300 of rear class is powered, and At All Other Times, is i.e. higher than maximum peak when the AC-input voltage of input
During the half of value, diode D1 and D2 is in cut-off state, and when diode D3 is also AC-input voltage peaking
Forward conduction, has long time, electric capacity C1 and C2 to be not involved in work, i.e. at AC-powered network in each cycle
In, if (surge voltage rising edge is very fast, and varistor, gas-discharge tube all exist Microsecond grade for the surge voltage of existence residual
The startup time, have little time to absorb), easily damage the Switching Power Supply etc. of rear class.And the common rectification filter of traditional low power factor
Wave circuit, owing to have employed electrochemical capacitor filtering, the capacity of electrochemical capacitor is relatively big, and terminal voltage cannot be suddenlyd change, the surge electricity of residual
Pressure-volume is easily absorbed by electrochemical capacitor, clamper, thus protects the Switching Power Supply etc. of rear class.
The high frequency ripple current produced for solving the circuit of reversed excitation 300 of the problem of above-mentioned 1st, i.e. rear class cannot fully be inhaled
The problem received, existing common way is directly in parallel high frequency, a little electricity for high pressure in the front end of rear class circuit of reversed excitation 300
Holding, electric capacity CL as shown in Figure 4, this also has certain protective effect to surge voltage, but effect is the least.In disclosed data,
Paper " constant current mode LED high-voltage based on valley fill circuit driving power supply such as " power technology application " the 8th phase in 2009
Design " in, it is simply that and upper electric capacity C5, its capacity is pressure for 100n/400V, is 0.1uF/400V electric capacity, and this article is numbered:
0219-2713 (2009) 08 0,027 05, author is Sha Zhanyou, horse turbulent waves；
In May, 2011 China's application number: the C3 in " high power factor valley fill circuit " of 201120178756.7；
In May, 2012 US publication US2013207567 " Boost converter assisted valley-
Fill power factor correction circuit " in electric capacity 117；
In July, 2012 China's application number: the electric capacity C4 in " LED power of High Power Factor " of 201210246771.X；
In July, 2012 China's application number: the electric capacity C5 in " the LED power supply circuits " of 201210266444.0；
Above data is denoted as existing 1 respectively to existing 5 files；
As above the technical scheme of made is all to adopt in this way, i.e. bears in this rear class of reverse exciting switching voltage regulator circuit
The two ends carried directly high frequency, a small capacitances for high pressure in parallel, the electric capacity CL that it is equivalent in Fig. 4.
The obtaining value method of electric capacity CL is: under the operating frequency of Switching Power Supply, and its capacitive reactance is less than exchange input minimum voltage
Under circuit of reversed excitation 300 equivalent inpnt DC impedance 1/10th, more than transformer efficiency in reverse exciting switching voltage regulator circuit
Direct current impedance and main power tube Rds(ON)And current sense resistor sum.
The weak point of shunt capacitance CL is, the running voltage of electric capacity CL is high；The capacity of electric capacity CL takes greatly, owing to existing
Filter action so that the power factor (PF) of the traditional valley fill circuit 200 shown in Fig. 4 declines；The capacity of electric capacity CL takes little, after
The high frequency ripple current that the circuit of reversed excitation 300 of level produces absorbs inconspicuous, causes the conversion efficiency of inverse-excitation type switch power-supply circuit
(η) declining, external differential mode Conduction Interference is the biggest；Due to electric capacity CL high frequency ripple to be absorbed, according to higfh-tension ceramics electric capacity, because of
There is piezoelectric effect in higfh-tension ceramics electric capacity, running voltage is the highest, and capacity is the least, needs the electric capacity the biggest with capacity, cost is high,
Volume is big, and according to the high-voltage capacitance of similar CBB (polypropylene capactive), equally, cost is high, and volume is bigger.
It is crucial that with compared with the full-time electrolytic capacitor filter in the current rectifying and wave filtering circuit of valley fill circuit, electric capacity CL by
Little in capacity, unsatisfactory to the assimilation effect of surge voltage, in the prior art including above-mentioned document, use and fill out paddy electricity
Road making, the various Switching Power Supplies produced and LED drive power supply, although adding X electric capacity, common mode inductance, pressure before rectifier bridge
Quick resistance, NTC themistor etc., in actual use, often because of undesirable and damage to the absorption of surge voltage, give each
Individual link brings the biggest loss.
I.e. use this existing shunt capacitance CL of Fig. 4 and (actually full-bridge is again bridge rectifier electricity at rectifier bridge 101
Road, rectifier bridge, be made up of four diodes) the front EMC safety device adding routine, the deficiency of circuit is summarized as follows:
(1) electric capacity CL running voltage is high, high frequency ripple current to be absorbed, and causes that volume is big, cost is high；Electric capacity CL capacity takes
Value is big, causes the power factor of valley fill circuit to decline；The little then high frequency ripple current of capacity value absorbs inconspicuous, it is difficult to compromise.
(2) poor to the assimilation effect of surge voltage, it is easily damaged in using；
(3) needing to design more complicated adjunct circuit before rectifier bridge, differential mode Conduction Interference degree could realize meeting in GB9254
The grade of CLASS B, relatively costly, volume is big.
Summary of the invention
In view of this, the invention solves the problems that the deficiency that existing valley fill circuit exists in the application, it is provided that a kind of band protection merit
The valley fill circuit of energy, when coordinating the Switching Power Supply work such as inverse-excitation type, does not deposit the electric capacity CL of prior art in the diagram in circuit, electricity
Road application is simple, the least on power factor impact, the good absorbing effect to surge voltage, and the adjunct circuit before rectifier bridge is simple,
Cost is relatively low, and volume is little, and differential mode Conduction Interference degree meets the grade of CLASS B in GB9254 simultaneously.
The object of the present invention is achieved like this, the valley fill circuit of a kind of band defencive function, is used for being directly connected to exchanging defeated
Enter, including valley fill circuit, and be located at the rectification circuit of the band defencive function of described valley fill circuit prime, described band defencive function
Rectification circuit include, the first varistor, the critesistor of negative temperature coefficient, safety electric capacity, inductance, rectifier bridge, second pressure
Quick resistance, described rectifier bridge has first input end, the second input, cathode output end and cathode output end；
Described exchange input has the first end and the second end, connects the rectification circuit of described band defencive function；Described band is protected
The rectification circuit of protective function includes two inputs that can exchange, cathode output end and cathode output end；
Described valley fill circuit includes, the first electric capacity and the first diode, and the positive pole of described first electric capacity connects rectification circuit
Cathode output end, the negative pole of described first electric capacity connects the negative electrode of the first diode, and the anode of described first diode connects
The cathode output end of rectification circuit；Second electric capacity and the second diode, the negative pole of described second electric capacity connects the first diode
Anode, the positive pole of described second electric capacity connects the anode of the second diode, and the negative electrode of described second diode connects the first electric capacity
Positive pole；3rd diode, the anode of described 3rd diode connects the negative pole of the first electric capacity, the negative electrode of described 3rd diode
Connecting the positive pole of the second electric capacity, described valley fill circuit is characterized in that: also includes the 3rd electric capacity, one end of described 3rd electric capacity and the
The negative pole of one electric capacity is connected, and the other end of described 3rd electric capacity and the positive pole of the second electric capacity are connected；
The connection of the rectification circuit of described band defencive function is: described first varistor is parallel to the first of exchange input
Between end and the second end, the two ends of the first varistor are two inputs that can exchange of the rectification circuit of band defencive function
End, the junction point of the first varistor and the second end is also connected with one end of the critesistor of negative temperature coefficient, negative temperature coefficient
The other end of critesistor connects one end of safety electric capacity, is simultaneously connected with the second input of rectifier bridge；First varistor with
The junction point of the first end of exchange input is also connected with the other end of safety electric capacity, is also connected with one end of inductance, the other end of inductance
Connect the first input end of rectifier bridge；Second varistor in parallel between cathode rectifier outfan and cathode output end.
As the equivalent of technique scheme, the another kind of annexation of the rectification circuit of described band defencive function
For: described first varistor is parallel between the first end and second end of exchange input, and the two ends of the first varistor are band
Two inputs that can exchange of the rectification circuit of defencive function, the junction point of the first varistor and the second end is also connected with bearing
One end of the critesistor of temperature coefficient, the other end of the critesistor of negative temperature coefficient connects one end of safety electric capacity, also connects
Connecing one end of inductance, the other end of inductance connects the second input of rectifier bridge；First varistor and exchange input first
The junction point of end is also connected with the other end of safety electric capacity, is simultaneously connected with the first input end of rectifier bridge；Cathode rectifier outfan
And the second varistor in parallel between cathode output end.
Preferably, the pressure sensitive voltage of described second varistor is less than the pressure sensitive voltage of described first varistor.
Preferably, described valley fill circuit, also include the first resistance, described first resistance and the 3rd described diode string
Connection, former 3rd diode described in the two-terminal devices formed after series connection replacement, and the direction of the 3rd diode described in holding
Constant.
Preferably, described 3rd electric capacity is chip ceramic capacitor.
Having the beneficial effect that of the valley fill circuit of the band defencive function of the present invention
(1) EMI performance is good, and after foregoing circuit appropriate design, differential mode Conduction Interference degree meets CLASS B in GB9254
Grade；
(2) protective value is good, in surge test, good absorbing effect, the residual voltage of rear class Switching Power Supply be down to safety value with
Under；
(3) power factor is big, and owing to there is not electric capacity CL, the running voltage of the 3rd electric capacity is low, omnidistance absorption high frequency ripple
Electric current, volume is little, low cost；3rd electric capacity value very much not causes the power factor of valley fill circuit to decline, and capacitance value is easy.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing valley fill circuit；
Fig. 2 is the running voltage oscillogram of existing valley fill circuit；
Fig. 3 be existing valley fill circuit its load for Switching Power Supply time schematic diagram；
Fig. 4 schematic diagram of shunt capacitance CL that is existing valley fill circuit for adaptive switching power circuit；
Fig. 5 is the schematic diagram of the valley fill circuit of the band defencive function of first embodiment of the invention；
Fig. 6 is the test result preservation figure of the Conduction Interference degree of the embodiment of the present invention one；
Fig. 7 is the schematic diagram of the valley fill circuit of the band defencive function of second embodiment of the invention；
Fig. 8 is the schematic diagram of the valley fill circuit of the band defencive function of third embodiment of the invention.
Detailed description of the invention
First embodiment
Fig. 5 shows the valley fill circuit schematic diagram of the band defencive function of first embodiment, a kind of band defencive function fill out paddy
Circuit, is used for being directly connected to exchange input UAC, including valley fill circuit 201, and be located at the band defencive function of valley fill circuit prime
Rectification circuit 202, exchange input UACThere is the first end 01 and the second end 02；Connect the rectification circuit 202 of band defencive function, band
The rectification circuit 202 of defencive function includes two inputs that can exchange, for the two ends of the first varistor RV1 in Fig. 5, with
And the cathode output end (V of rectifier bridge 101O+The terminal being connected with the second varistor RV2) and cathode output end (rectifier bridge 101
VO-The terminal being connected with the second varistor RV2)；
Valley fill circuit 201 includes, the positive pole of the first electric capacity C1 and the first diode D1, the first electric capacity C1 connects rectification circuit
Cathode output end, the negative pole of the first electric capacity C1 connects the negative electrode of the first diode D1, and the anode of the first diode D1 connects whole
The cathode output end of current circuit；Second electric capacity C2 and the second diode D2, the negative pole of the second electric capacity C2 connects the first diode D1
Anode, the positive pole of the second electric capacity C2 connects the anode of the second diode D2, and the negative electrode of the second diode D2 connects the first electric capacity
The positive pole of C1；3rd diode D3, the anode of the 3rd diode D3 connects the negative pole of the first electric capacity C1, the moon of the 3rd diode D3
Pole connects the positive pole of the second electric capacity C2, and the feature of valley fill circuit 201 is: also include the 3rd electric capacity C3, one end of the 3rd electric capacity C3
Being connected with the negative pole of the first electric capacity C1, the other end of the 3rd electric capacity C3 and the positive pole of the second electric capacity C2 are connected；
Rectification circuit 202 with defencive function includes, the first varistor RV1, the critesistor NTC of negative temperature coefficient,
Safety electric capacity C, inductance L, rectifier bridge the 101, second varistor RV2, rectifier bridge 101 has first input end 11, second and inputs
End 12, cathode output end VO+With cathode output end VO-；The annexation of the rectification circuit 202 with defencive function is: first is pressure-sensitive
Resistance RV1 is parallel between the first end 01 and second end 02 of exchange input, and the two ends of the first varistor RV1 are that merit protected by band
Two inputs that can exchange of the rectification circuit of energy, the junction point of the first varistor RV1 and the second end 02 is also connected with bearing
One end of the critesistor NTC of temperature coefficient, the other end of the critesistor NTC of negative temperature coefficient connects the one of safety electric capacity C
End, is simultaneously connected with the second input 12 of rectifier bridge 101；First varistor RV1 and the connection exchanging the first end 01 inputted
Point is also connected with the other end of safety electric capacity C, is also connected with one end of inductance L, and the other end of inductance L connects the first of rectifier bridge 101
Input 11；Rectifier bridge 101 cathode output end VO+With cathode output end VO-Between the second varistor RV2 in parallel.
For convenience, the first electric capacity C1 is referred to as electric capacity C1 below, and other is identical, as the second diode D2 is referred to as two poles
Pipe D2.
Rectification circuit 202 operation principle with defencive function is:
As exchange input UACAfter powering on, power-frequency voltage UACThe first end 01 through the input 11 of inductance L to rectifier bridge 101,
UACThe second end 02 through the input 12 of critesistor NTC to rectifier bridge 101, rectifier bridge 101 complete rectification, obtain pulsation straight
Stream electricity is from rectifier bridge 101 cathode output end VO+With cathode output end VO-Between export, complete rectification.
As exchange input UACDuring containing surge voltage, there is the opening time of a Microsecond grade in varistor RV1, pressure-sensitive
Before resistance RV1 does not have enough time to open, the spike of surge voltage is decayed through first RC filter circuit, first RC filtering
Circuit is made up of critesistor NTC and safety electric capacity C, and critesistor NTC its internal resistance when normal work is the lowest, to reduce insertion
Loss, although the internal resistance of critesistor NTC falls too low, and the RC filter circuit of safety electric capacity C composition still has good integration
Effect, the residual surge voltage at electric capacity C two ends is, then connect the electric capacity composition the formed through inductance L and electric capacity C1 and C2, C3
Two grades of LC filter circuits, are integrated the residual surge voltage at electric capacity C two ends further, and so, the rear class as load is anti-
The running voltage of excitation circuit 300 will be clamped, thus is protected.300 is inverse-excitation type switch power-supply here, and other switchs electricity
Source is also possible.Electric capacity C selects safety electric capacity, because safety electric capacity just can bear high voltage surge, its failure mode is capacity
Reduce, but will not be breakdown.
Before varistor RV1 does not have enough time to open, by two above-mentioned filter circuit tandem workings, it is ensured that rear class is anti-
The terminal voltage of excitation circuit 300 is within safety value；Then, varistor RV1 opens, and utilizes exchange input UACInternal resistance and pressure-sensitive
The clamper function of resistance RV1 self, carries out clamper to surge voltage, and the varistor of general diameter 10mm can absorb 3000A
National regulations surge current, then the current-limiting type clamp circuit being made up of critesistor NTC and varistor RV2 carries out further
Clamper, the electric current flowing through critesistor NTC is: (the actual clamper of the actual clamp voltage-varistor RV2 of varistor RV1
Voltage) the actual internal resistance of/NTC；The design of circuit to guarantee this electric current maximum impact electric current less than critesistor NTC.
So through varistor RV1, critesistor NTC, the anti-surge circuit of varistor RV2 this two-stage clamper,
Guarantee that the running voltage of rear class circuit of reversed excitation 300 is below safety value.
Note: in above-mentioned analysis, rectifier bridge 101 in fact can be in the conduction state, owing to pressure drop is low, is the most all considered as it
Internal 4 parallel conductings of commutation diode or cross-conduction, the principle analysis on circuit does not affects.
The operation principle of this valley fill circuit 201 is:
After initial charge, when input ac voltage is close to voltage peak, electric capacity C1, electric capacity C2 and electric capacity C3 are filled
Electricity, i.e. when after alternating current pressuring meridian rectification circuit 202, exports from the cathode output end of rectification circuit 202, electric current through electric capacity C1, two
Pole pipe D3 and electric capacity C3, electric capacity C2 return the cathode output end of rectification circuit 202, it is achieved to electric capacity C1, electric capacity C2 and electric capacity C3
It is charged.Because electric capacity C3 and diode D3 is parallel relationship, the terminal voltage of electric capacity C3 can only be charged to the forward of diode D3
Between conduction voltage drop, generally 0.45V to 1.2V, during this, diode D1 and D2 is in cut-off state, and electric capacity C3 is
On just lower negative.Diode D3 only works in charging process, therefore named charging diode.
Discharging when alternating voltage drops to less than half of peak-peak, i.e. the discharge current of electric capacity C1 is through flyback
Circuit 300, diode D1 return to the negative pole of electric capacity C1, and meanwhile, the discharge current of electric capacity C2 is through diode D2, circuit of reversed excitation 300
It flow back into the negative pole of electric capacity C2.
When electric discharge, electric capacity C1 and electric capacity C2 is equivalent parallel electric discharge, and electric capacity C1 and electric capacity C2 equivalent parallel are to electricity simultaneously
Holding C3 and carry out reverse charging, during this, diode D1 and D2 is in conducting state, and the upper terminal A of electric capacity C3 is (with two poles
One end that the anode of pipe D3 is connected) the output negative pole current potential of rectifier bridge 101, one two pole of current potential difference it are clamped to by diode D1
The conduction voltage drop of pipe D1, lower terminal B (another terminal being connected with the negative electrode of diode D3) of electric capacity C3 is clamped by diode D2
Position to the output cathode current potential of rectifier bridge 101, the conduction voltage drop of current potential one diode D2 of difference, i.e. electric capacity C3 be upper negative under
Just, being equivalent to electric capacity C1 and electric capacity C2 is that electric capacity C3 is charged by equivalent parallel.Diode D1 and D2 is equivalence when electric discharge
In parallel, referred to as discharge diode.
From the foregoing, it will be observed that no matter how the terminal voltage of electric capacity C3 changes, in the overall process of valley fill circuit 201 charge and discharge, and
Be coupled to the electric capacity C3 and electric capacity C1 at diode D3 two ends, electric capacity C2 can substantially effectively filter high-frequency harmonic composition, i.e. uses
At the two ends shunt capacitance C3 of diode D3, it is arranged at the high-frequency filter capacitor CL's of rear class circuit of reversed excitation 300 front end with replacement
Valley fill circuit, it is achieved that be arranged at the High frequency filter function of the electric capacity CL of rear class circuit of reversed excitation 300 front end in available circuit.Residual
Differential mode high frequency ripple voltage, can inhale further the LC filter circuit of inductance L before rectifier bridge 101 and electric capacity C composition
Receiving, this is the Important Circuit composition that differential mode Conduction Interference degree of the present invention meets the grade of CLASS B in GB9254；
Due to electric capacity C3 working method during the charge and discharge of valley fill circuit 201 it is again, charging process: by two poles
Pipe D3 clamper is in the forward conduction voltage drop of diode, and the terminal voltage of electric capacity C3 is upper just lower negative；Discharge process: the upper end of electric capacity C3
Sub-A is clamped to the output negative pole current potential of rectifier bridge 101, the conduction voltage drop of current potential one diode D1 of difference, electricity by diode D1
Lower terminal B holding C3 is clamped to the output cathode current potential of rectifier bridge 101 by diode D2, and current potential one diode D2 of difference leads
Logical pressure drop, the i.e. terminal voltage of electric capacity C3 be upper negative under just.The electric energy consumed in the mode of operation of polarity upset due to electric capacity C3
It is by electric capacity C1 and electric capacity C2 electric discharge gained, the most directly the circuit of reversed excitation 300 of successive load is discharged, and be different from prior art
Middle electric capacity CL is such, becomes the filter capacitor directly to rear class circuit of reversed excitation 300 electric discharge, so the valley fill circuit 201 of the present invention
Improve power factor.
Owing to electric capacity C3 is parallel to the two ends of diode D3, in the charge and discharge overall process of valley fill circuit 201, respectively by
Diode D1, D2, D3 clamper, and (crest voltage of input Rectified alternating current, equal to input AC without directly bearing full voltage
The radical sign 2 times of electricity virtual value).The ceiling voltage that after clamper, electric capacity C3 may the bear the highest electricity equal to electric capacity C1 or electric capacity C2
Pressure, is the half of the crest voltage of input Rectified alternating current, and electric capacity C3 can directly use pressure voltage to be input Rectified alternating current
The electric capacity of more than half of crest voltage, be just entirely capable of meeting the security reliability requirement of this valley fill circuit 201.Relative to existing
Electric capacity CL in circuit, the pressure voltage of electric capacity C3 is had to reduce half.The pressure voltage of electric capacity reduces half, extends capacitor element
Type selecting scope, volume the most significantly reduces, and adds the convenience of device buying, and can reduce purchase cost, also helps fall
The impact on side circuit of the electric parameter discreteness of low electronic devices and components.Because the volume of capacitor element is also greatly reduced, more sharp
Realization in circuit product Miniaturization Design.
Now turn the inverse-excitation type switch power-supply of 12VDC/5W by 220VAC as a example by, illustrate the present invention's by the data of actual measurement
Effect:
Model machine one: using valley fill circuit shown in existing Fig. 4, rectifier bridge 101 after rectification is 1N4,007 tetra-composition, electric capacity
C1 and C2 is 4.7uF/250V electrochemical capacitor, and diode D1 to D3 is 1N4007；Electric capacity CL is 0.22uF/400V, has selected CBB
Thin-film capacitor；Volume is 18mm × 14.5mm × 8.5mm；EMI protection circuit uses the various circuit that background technology is mentioned；Respectively
It is denoted as existing 1 to existing 5.
Model machine two: use the valley fill circuit of first embodiment of the invention after rectification, is shown in that Fig. 5, rectifier bridge 101 are 1N4,007 tetra-
Only composition, electric capacity C1 and C2 is 4.7uF/250V electrochemical capacitor, and diode D1 to D3 is 1N4007；Electric capacity C3 is 0.22uF/
200V is encapsulated as 1812 Standard patch electric capacity, a size of 4.5mm × 3.2mm, and thickness is only 1.8mm.Varistor RV1 is
10D471, critesistor NTC are 18D-9, varistor RV2 is 7D431, and electric capacity C3 is the safety electric capacity of 104, and inductance L is
The I shape plug-in unit inductance of 1.2mH/500mA.
Circuit of reversed excitation 300 uses NCP1015 as the 5W topological power of master control IC, and the design parameter of circuit is at NCP1015
There is recommendation on the technical manual of the official website of manufacturer, repeat no more here.
Through testing under same test condition, it is EMS61000-5B that the stream used by test gushes generator, and voltage is
2000V, point four phase places, respectively 0 °, 90 °, 180 °, 270 °, each phase place divides positive and negative superposition each ten times, totally 80 times；Conduction
Degree of disturbance employs PMM7000 tester, draws the survey of following prior art and the valley fill circuit of band defencive function of the present invention
Examination contrast table:
The test Data Comparison table of the valley fill circuit of prior art and band defencive function of the present invention
The test result of the Conduction Interference degree of the embodiment of the present invention one is shown in Fig. 6, and only peak value is between 500KHz to 1MHz
Having and exceed standard, this is that GB allows, and meansigma methods is all below limit value.
Visible, the present invention can solve the problems of the prior art really, with having that less element, cost acquisition are wanted
Benefit suburb fruit.
It is true that in special environment, in a low temperature of-40 DEG C, the electrolysis of the low temperature owing to-40 DEG C can be operated in
Electric capacity is difficult to obtain, and reliability is the lowest, and electric capacity C1 and C2 can use non-polar electric capacity to substitute, and applies at low power electricity
In origin system.Electric capacity C1 and C2 is as used CBB thin-film capacitor, and such as the electric capacity of 2.2uF/250V, the power of Switching Power Supply is left at 3W
Right.At this moment, in use, first to define the terminal of electric capacity C1 and C2, e.g., the positive pole of the first terminal correspondence electric capacity, the second end
The negative pole of the corresponding electric capacity of son, so implements the present invention, and now, positive and negative electrode represents symbol, is used for distinguishing polarity free capacitor at electricity
Terminal in road, in order to distinguish annexation and correctly connect.
Second embodiment
Fig. 7 shows the valley fill circuit schematic diagram of the band defencive function of the second embodiment, a kind of band defencive function fill out paddy
Circuit, is used for being directly connected to exchange input UAC, including valley fill circuit 201, and be located at the band defencive function of valley fill circuit prime
Rectification circuit 202, exchange input UACThere is the first end 01 and the second end 02；Connect the rectification circuit 202 of band defencive function, band
The rectification circuit 202 of defencive function includes two inputs that can exchange, for the two ends of the first varistor RV1 in Fig. 7, with
And the cathode output end (V of rectifier bridge 101O+The terminal being connected with the second varistor RV2) and cathode output end (rectifier bridge 101
VO-The terminal being connected with the second varistor RV2)；
The circuit connecting relation of valley fill circuit 201 is identical with first embodiment, repeats no more here；
Rectification circuit 202 with defencive function have employed the equivalent technical solutions in technical scheme, with first embodiment
Annexation is different, and its annexation is: the first varistor RV1 be parallel to the first end 01 of exchange input and the second end 02 it
Between, two inputs that can exchange of the rectification circuit that two ends are band defencive function 202 of the first varistor RV1, first
The junction point of varistor RV1 and the second end 02 is also connected with one end of the critesistor NTC of negative temperature coefficient, negative temperature coefficient
The other end of critesistor NTC connects one end of safety electric capacity C, is also connected with one end of inductance L, and the other end of inductance L connects whole
Second input 12 of stream bridge 101；First varistor RV1 is also connected with safety electricity with the junction point of the first end 01 exchanging input
Hold the other end of C, be simultaneously connected with the first input end 11 of rectifier bridge 101；Rectifier bridge 101 cathode output end VO+And cathode output end
VO-Between the second varistor RV2 in parallel.
The operation principle of the second embodiment is identical with first embodiment, actual test result and first embodiment
The most identical.
Visible, the present invention can solve problem of the prior art really, wants with less element, cost acquisition
Useful suburb fruit.
3rd embodiment
Fig. 8 shows the valley fill circuit schematic diagram of the band defencive function of the 3rd embodiment, a kind of band defencive function fill out paddy
Circuit, is used for being directly connected to exchange input UAC, including valley fill circuit 201 ', and be located at the band defencive function of valley fill circuit prime
Rectification circuit 202, exchange input UACThere is the first end 01 and the second end 02；Connect the rectification circuit 202 of band defencive function, band
The rectification circuit 202 of defencive function includes two inputs that can exchange, for the two ends of varistor RV1, Yi Jizheng in Fig. 8
Pole outfan (the V of rectifier bridge 101O+The terminal being connected with the second varistor RV2) and the cathode output end (V of rectifier bridge 101O-
The terminal being connected with varistor RV2)；
Being with the difference of first and second embodiment, valley fill circuit 201 ' also includes resistance R1, resistance R1 and diode
D3 series connection forms two-terminal devices, and this two-terminal devices substitutes the diode D3 in first and second embodiment, and keeps diode D3
Closure in circuit is constant, i.e. the merit that electric capacity C1 and C2 is only charged by charging diode D3 when alternating current is close to peak value
Can be constant.Resistance R1 connects with diode D3, and electric capacity C3 is parallel to the two-terminal device formed after resistance R1 connects with diode D3
Part two ends, the resistance R1 connected with diode D3 is in order to improve the arteries and veins of the charging current when the alternating voltage of input is close to peak value
Width, improves the power factor of the present invention further.
Now turn the inverse-excitation type switch power-supply of 12VDC/40W by 220VAC as a example by, the power used by test is calculated as WT210, warp
Test under same test condition, the effect of third embodiment of the invention is described by the data of actual measurement.
Model machine two, for the model machine two in embodiment one；After tested, the power factor of model machine two is 0.92, and efficiency is
89.3%。
Model machine three, based on model machine two, the resistance R1 additionally sealing in 10 Europe in diode D3 makes embodiment
The model machine of valley fill circuit 201 ' in three, power is 3W.Test draws, the power factor of model machine three is from 0.92 that model machine two records
Rise to 0.925.
Below it is only the preferred embodiment of the present invention, it is noted that it is right that above-mentioned preferred implementation is not construed as
The restriction of the present invention.For those skilled in the art, without departing from the spirit and scope of the present invention, also
Can make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention, the most no longer with implementing
Example repeats, as set up varistor, critesistor, safety electric capacity and inductance further in the periphery of the valley fill circuit of the present invention,
Protection scope of the present invention should be as the criterion with claim limited range.
Claims (6)
1. a valley fill circuit for band defencive function, is used for being directly connected to exchange input, including valley fill circuit, and fills out described in being located at
The rectification circuit of the band defencive function of paddy circuit prime, the rectification circuit of described band defencive function includes, the first varistor,
The critesistor of negative temperature coefficient, safety electric capacity, inductance, rectifier bridge, the second varistor, described rectifier bridge has the first input
End, the second input, cathode output end and cathode output end；
Described exchange input has the first end and the second end, connects the rectification circuit of described band defencive function；Described band protection merit
The rectification circuit of energy includes two inputs that can exchange, cathode output end and cathode output end；
Described valley fill circuit includes, the first electric capacity and the first diode, and the positive pole of described first electric capacity is just connecting rectification circuit
Pole outfan, the negative pole of described first electric capacity connects the negative electrode of the first diode, and the anode of described first diode connects rectification
The cathode output end of circuit；Second electric capacity and the second diode, the negative pole of described second electric capacity connects the anode of the first diode,
The positive pole of described second electric capacity connects the anode of the second diode, and the negative electrode of described second diode is just connecting the first electric capacity
Pole；3rd diode, the anode of described 3rd diode connects the negative pole of the first electric capacity, and the negative electrode of described 3rd diode connects
The positive pole of the second electric capacity, described valley fill circuit is characterized in that: also includes the 3rd electric capacity, one end of described 3rd electric capacity and the first electricity
The negative pole held is connected, and the other end of described 3rd electric capacity and the positive pole of the second electric capacity are connected.
The valley fill circuit of band defencive function the most according to claim 1, is characterized in that: the rectified current of described band defencive function
The connection on road is: described first varistor be parallel to exchange input the first end and the second end between, the first varistor with
The junction point of the second end is also connected with one end of the critesistor of negative temperature coefficient, and the other end of the critesistor of negative temperature coefficient is even
Connect one end of safety electric capacity, be simultaneously connected with the second input of rectifier bridge；First varistor and the first end exchanging input
Junction point is also connected with the other end of safety electric capacity, is also connected with one end of inductance, and the first of the other end connection rectifier bridge of inductance is defeated
Enter end；Second varistor in parallel between cathode rectifier outfan and cathode output end.
The valley fill circuit of band defencive function the most according to claim 1, is characterized in that: described first varistor is parallel to
Between first end and second end of exchange input, meanwhile, the two ends of the first varistor are as the rectification circuit of band defencive function
Two inputs that can exchange, the junction point of the first varistor and the second end is also connected with the critesistor of negative temperature coefficient
One end, the other end of the critesistor of negative temperature coefficient connects one end of safety electric capacity, is also connected with one end of inductance, inductance
The other end connects the second input of rectifier bridge；First varistor is also connected with safety with the junction point of the first end exchanging input
The other end of electric capacity, is simultaneously connected with the first input end of rectifier bridge；Parallel connection between cathode rectifier outfan and cathode output end
Second varistor.
4. according to the valley fill circuit of the band defencive function according to any one of claim 2 to 3, it is characterized in that: described second pressure
The pressure sensitive voltage of quick resistance is less than the pressure sensitive voltage of described first varistor.
5., according to the valley fill circuit of the band defencive function according to any one of claim 2 to 3, it is characterized in that: described in fill out paddy electricity
Road also includes the first resistance and the 4th diode, described first resistance and the 4th described Diode series, is formed after series connection
The 3rd diode described in two-terminal devices replacement, and keep constant with the direction of the 3rd described diode.
The valley fill circuit of band defencive function the most according to claim 5, is characterized in that: described 3rd electric capacity is chip ceramic
Electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410274298.5A CN104079185B (en) | 2014-06-18 | 2014-06-18 | A kind of valley fill circuit of band defencive function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410274298.5A CN104079185B (en) | 2014-06-18 | 2014-06-18 | A kind of valley fill circuit of band defencive function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104079185A CN104079185A (en) | 2014-10-01 |
| CN104079185B true CN104079185B (en) | 2017-01-04 |
Family
ID=51600274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410274298.5A Active CN104079185B (en) | 2014-06-18 | 2014-06-18 | A kind of valley fill circuit of band defencive function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104079185B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870895A (en) * | 2016-05-13 | 2016-08-17 | 广州金升阳科技有限公司 | Protection circuit for lightning surge |
| CN112087842B (en) * | 2019-05-27 | 2024-04-26 | 李宗凤 | Practical LED driver |
| US11063511B1 (en) | 2020-01-06 | 2021-07-13 | Elite Semiconductor Memory Technology Inc. | Valley-fill PFC circuit with EMI protection |
| TWI724777B (en) * | 2020-02-04 | 2021-04-11 | 晶豪科技股份有限公司 | Power control circuit |
| CN112468003B (en) * | 2020-11-12 | 2022-12-30 | Oppo广东移动通信有限公司 | Power supply device, charging method and system |
| 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 |
| CN115765419A (en) * | 2022-12-09 | 2023-03-07 | 赛尔富电子有限公司 | Surge suppression circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5130610A (en) * | 1990-01-31 | 1992-07-14 | Toshiba Lighting & Technology Corporation | Discharge lamp lighting apparatus |
| US5714846A (en) * | 1994-07-07 | 1998-02-03 | Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh | Minimum harmonic distortion operating circuit for at least one low-pressure discharge lamp |
| CN1543755A (en) * | 2001-06-22 | 2004-11-03 | �¬ | Electronic ballast |
| WO2013089506A1 (en) * | 2011-12-16 | 2013-06-20 | 서울반도체 주식회사 | Led driving device |
-
2014
- 2014-06-18 CN CN201410274298.5A patent/CN104079185B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5130610A (en) * | 1990-01-31 | 1992-07-14 | Toshiba Lighting & Technology Corporation | Discharge lamp lighting apparatus |
| US5714846A (en) * | 1994-07-07 | 1998-02-03 | Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh | Minimum harmonic distortion operating circuit for at least one low-pressure discharge lamp |
| CN1543755A (en) * | 2001-06-22 | 2004-11-03 | �¬ | Electronic ballast |
| WO2013089506A1 (en) * | 2011-12-16 | 2013-06-20 | 서울반도체 주식회사 | Led driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104079185A (en) | 2014-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104079185B (en) | A kind of valley fill circuit of band defencive function | |
| CN102843019B (en) | A kind of filter circuit | |
| CN104682680A (en) | Rectification and filtering method and circuit | |
| CN105527524A (en) | Indication circuit for switch power supply and usage method | |
| CN106208759B (en) | A kind of Switching Power Supply with active power factor correction | |
| CN105491728B (en) | Direct filtering type switching power supply | |
| WO2014058753A2 (en) | Passive power factor correction incorporating ac/dc conversion | |
| CN102026447A (en) | Daylight lamp constant current driving method and driving circuit thereof | |
| CN206099800U (en) | High power factor AC DC constant current source electrical power generating system based on ARM control | |
| CN206100548U (en) | Electrical power generating system based on ARM control system realizes drive of single -stage PFCLED | |
| CN104578843A (en) | Filter circuit of AC/DC (alternating current/direct current) switching converter | |
| CN206343741U (en) | Welding machine power supply circuit | |
| CN106093665B (en) | A kind of Switching Power Supply indicating circuit and its application method | |
| CN205491305U (en) | Direct filtering switching power supply | |
| CN206024180U (en) | A kind of LED lamp tube power driving circuit | |
| CN104079160B (en) | A kind of valley fill circuit | |
| CN103454464B (en) | A kind of anti-6KV surge circuit and power supply circuits of ammeter | |
| CN104079188B (en) | A kind of inverse-excitation type switch power-supply circuit | |
| CN202221960U (en) | Passive PFC circuit | |
| CN106411160A (en) | Switching power supply | |
| CN208316590U (en) | A kind of novel LWD host PFC correction regulated power supply system | |
| CN206977324U (en) | Power circuit for low-voltage circuit breaker | |
| CN209513871U (en) | A kind of power circuit of single-phase electric energy meter | |
| CN206259865U (en) | A kind of Switching Power Supply | |
| CN105186878A (en) | Single-phase CD type passive PFC inversion type welding power supply |
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 |