CN106208759A - A kind of Switching Power Supply of band APFC - Google Patents
A kind of Switching Power Supply of band APFC Download PDFInfo
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- CN106208759A CN106208759A CN201610639654.8A CN201610639654A CN106208759A CN 106208759 A CN106208759 A CN 106208759A CN 201610639654 A CN201610639654 A CN 201610639654A CN 106208759 A CN106208759 A CN 106208759A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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Abstract
A kind of Switching Power Supply of band APFC, including circuit of power factor correction PFC, filter circuit 200, main power stage 300, and indicating circuit 400,400 include terminal 1,2, resistance R1, electric capacity C1, diode D1 and LED, in parallel with R1 again after LED and D1 reverse parallel connection, then connect with C1；400 is in parallel with filtering electrolysis CA2, and the capacity of C1 is little, the power frequency frequency multiplication Sinusoidal Ripple that PFC causes, minimum by the electric current of C1, and the pressure drop produced on R1 is not enough to light LED；Along with the ESR rise of CA2, the pressure drop that high frequency charging and discharging currents produces on ESR synchronizes to raise, and the high frequency ripple voltage of formation increases, C1 has the effect of logical high frequency, when high frequency ripple voltage on ESR arrives certain threshold values, the resistance lighting LED, regulation R1 can regulate the size of threshold values.Thus remind the ESR of user electrolysis CA2 to have gone up, there is failure risk in Switching Power Supply, this circuit cost is low, it is easy to implement, and does not use inductance detection.
Description
Technical field
The present invention relates to field of switch power, particularly to the exchange or straight of the high reliability of band APFC
Rheology is changed to the Switching Power Supply of direct current.
Background technology
At present, Switching Power Supply application is very wide, for input power at below 75W, to power factor (PF, Power
Factor, also referred to as power factor (PF)) occasion that is not required, inverse-excitation type (Fly-back) Switching Power Supply accounts for main flow.For input work
The rate power supply more than 75W, the most a lot of illuminating switch power supply type drivers, although power is in below 75W, national standard
Its power factor is required.
Having used circuit of power factor correction to solve this problem at present, circuit of power factor correction is referred to as PFC electricity
Road, is the abbreviation of Power Factor Correction.The mode of a kind of low cost is: between rectifier bridge and filter capacitor
Connect an inductance, owing to being all passive device, still referred to as PPFC.APFC is
The Chinese of " Active Power Factor Correction ", is called for short APFC, common is defined as: at commutator and negative
Access a DC-DC switch converters, applied current feedback technique between load, make input electric current iiWaveform tracking exchange input
Sinusoidal voltage waveform, can make iiClose to sinusoidal wave.So that total harmonic distortion THD of input electric current is less than 5%.And power
Factor can bring up to 0.99 or higher.Owing to this scheme employing active device, therefore referred to as APFC,
General PF value accomplishes more than 0.9, it is possible to meet the standard of a lot of country, if load is Switching Power Supply, then, system carries exactly
The Switching Power Supply of APFC, is again Two Stages formula Switching Power Supply, and the second level as the load of first order PFC is opened
Close power supply, the most main power stage changer, be called for short main power stage.
Rectifier bridge seals in PFC inductance, still belongs to PPFC, be not active power factor school
Just.We are the Switching Power Supply of directly filtering after rectification, and rectifier bridge seals in PFC inductance, then the switch filtered
Power supply, because only that one-level power conversion circuit, is all defined as: directly filtering type Switching Power Supply.
Fig. 1 shows the Boost APFC circuit of a kind of main flow, is the most all written as Boost pfc circuit, this is because, band
There is Boost circuit, must be APFC, at the output end vo of the circuit of Fig. 1, then connect other merit
Rate level DC-DC converter, the most main power stage, it is simply that the Switching Power Supply of the band APFC of standard.Anti exciting converter,
Half-bridge converter, LLC changer, asymmetrical half-bridge, single tube forward converter can become main power stage.
Rectifier bridge Z101 is typically made up of four commutation diodes, the mandate invention description of application number 201210056555.9
Fig. 4-1 in book, Fig. 4-2, Fig. 4-3 give several known technique of painting of rectifier bridge.
Traditional BOOST circuit of power factor correction, its operation principle may refer to " the switch electricity of Electronic Industry Press
The principle in source and design " page 190, page 191, this book ISBN 7-121-00211-6.
Because the capacitance of electrochemical capacitor unit volume is very big, so in the Switching Power Supply of band APFC
In, also using electrochemical capacitor, the C101 in Fig. 1 is the filter capacitor of PFC, generally electrochemical capacitor, is hereinafter referred to as electrolysed.
BOOST circuit of power factor correction needs to use the electrolysis of more than pressure up to input AC electricity peak value, for China
220VAC civil power, it is considered to voltage can rise to 264VAC once in a while, peak value is 373V, need to use the electrolysis conduct of pressure more than 400V
The output filter capacitor of BOOST circuit of power factor correction；In order to obtain good power factor, BOOST PFC electricity
The output voltage on road is typically scheduled on about 400V, and it is pressure that the electrolysis of use is generally 450V, and some manufacturers release 420V ordinatedly
Pressure electrolysis.Due to the height that output voltage has been 400V of BOOST circuit of power factor correction, to the follow-up second level
Main power stage topology selects to make troubles, and if computer export voltage is 12V, 5V and 3.3V, drops to the lowest from 400V
Voltage, the high electric current pressure, big of needs, low internal resistance metal-oxide-semiconductor as switching tube.Just because of this, the whole world is to buck power
Factor correcting circuit research is strengthened day by day.
" CONTROLIED ON-TIME BUCK PFC " United States Patent (USP) such as U.S. Patent Publication No. US 2010123448
Prospectus shows a kind of buck pfc circuit, technical scheme as disclosed in it, employs BUCK circuit, PWM mode control
Switch in BUCK circuit processed.
" a kind of buck pfc circuit " of the Application No. 201210271808.4 that China has authorized for another example is also a kind of fall
Pressure type circuit of power factor correction, same use is electrolysed the filter capacitor as PFC.
Along with the popularization of intellectualizing system in industrial circle, use and be electrolysed the weak point of the filter capacitor as PFC also
Embodying therewith, see Fig. 1, because employing electrolysis C101, and the characteristic of this electrolysis and hence, limit the use of Switching Power Supply
On the way, the electrolysis life-span under high temperature and low temperature is always an industry difficult problem, it is well known that it is resistance to that electric capacity C101 is often 400V to 450V
The electrolysis of pressure, and the pressure electrolysis more than 250V, its low temperature typically can only work-25 DEG C.I.e. in the environment of-40 DEG C, as
The countries and regions of three provinces in the northeast of China, Xinjiang and high latitude, the use of Switching Power Supply becomes thorny, of course, it is possible to use such as
CBB thin-film capacitor filters, but volume is excessive, high cost.
For using the Switching Power Supply of buck power factor correcting circuit, owing to buck PFC output voltage is low, its filter
The ripple current that the PFC electrolysis of ripple is to be born is bigger, and its service life also can not be ignored.
Certainly, also have a kind of circuit of power factor correction, use BUCK-BOOST as the master of circuit of power factor correction
Topology, can be with blood pressure lowering, it is also possible to boosting, but controls complexity, the most universal.
For convenience, the Switching Power Supply of band APFC, we are simply divided into three parts: power factor
Correcting circuit, filter circuit, main power stage.In Fig. 1, rectifier bridge Z101, L101, diode D101 and switching tube Q101 and
Pwm control circuit constitutes circuit of power factor correction；The application is for convenience, electric originally belonging to PFC
The electrolysis C101 of the filtering on road is independent, regards filter circuit as, and filter circuit can be an electrolysis, it is also possible to be electricity
Solve and the parallel connection of high pressure patch capacitor, it is also possible to the thin-film capacitor being electrolysis and CBB class is in parallel, it is also possible to be π type filter circuit,
May also be in parallel with other high-voltage capacitance again after low-voltage electrolysis is connected；In the output end vo of the circuit of Fig. 1, other merit of connection
Rate level DC-DC converter, it is simply that described main power stage, note, in Fig. 1 and be not drawn into power stage.
During one Switching Power Supply of design, often face the life problems of electrolysis C101, in actual use, much switch electricity
Source does not reaches service life, and its main cause is exactly the electrolysis premature failure filtered.The occasion that a lot of requirements are higher, have employed redundancy
Design, uses two Switching Power Supplies to backup each other, is broken one, it is also possible to normally work.Cost is the highest, and does not still know it
Breaker in middle power supply is when to lose efficacy, and is also inconvenient to prepare spare unit.
Common nonredundancy design occasion, once Switching Power Supply lost efficacy, it will cause a lot of related inefficacy, so that damage
Losing extended, according to statistics, the Switching Power Supply of qualified design lost efficacy, and 97% is above being lost efficacy in advance by the electrolysis filtered causing
's.
Existing most Switching Power Supply using electrolysis, still can not carry out effectively informing in advance to the inefficacy of electrolysis.
Existing patent application " the switch electricity of a kind of band APFC in the Application No. 201610040059.2 of inventor
Source " in, provide a solution, for convenience, this most existing patent A of patent application 201610040059.2.
See Fig. 2 of existing patent A, for convenience, refer to Fig. 2 Fig. 2 as the application of existing patent A, go forward side by side
Numbering of having gone adjusts: the C1 of existing patent A is adjusted to the CA1 in the application Fig. 2, the C2 of existing patent A and is adjusted to the application Fig. 2
In CA2, i.e. CA1 in the application Fig. 2 represent the C1 of existing patent A, the CA2 in the application Fig. 2 represents existing patent A
C2。
The solution of existing patent A describes: seals in indicating circuit in the PFC current supply circuit of electrolysis C101, and increases
Electric capacity CA1, indicating circuit is composed in parallel by luminescence unit and inductance L, it is ensured that the PFC direct current supply sense of current by inductance L
Contrary with the conducting direction of luminescence unit, electrolysis C101 has the most just become CA2, when being electrolysed CA2 and being normal, and the excitatory electricity of main power stage
Stream is substantially not present in inductance L, and LED is the most luminous；When the ESR rise of electrolysis CA2 is bigger, the exciting curent of main power stage goes out
Now in L, and when the power tube in main power stage turns off, the exciting curent flowing through L cannot suddenly change, through luminous organ LED afterflow,
Simultaneously drive LED luminous, so remind user: the ESR of the electrolysis CA2 of Switching Power Supply has gone up, and there is the wind of inefficacy
By inches, it is to avoid the expansion of loss, have low cost, efficiency is constant, implement easy feature.
Existing patent A employs inductance L, and increases electric capacity CA1 and constitute π type filter circuit, could realize in filtered electrical
Solve complete failure premise and supply instruction, inform in advance before Switching Power Supply complete failure.High frequency due to CA1 pfc circuit to be born
Ripple, it is desirable to the largest ripple current of CA1 is big, it is desirable to the ESR of CA1 is the lowest, the capacity of CA1 would not be the lowest, and the cost of CA1 is just
Can be the highest.Simultaneously between this circuit pfc circuit to be series at and electrolytic capacitor filter, original circuit to be modified.
It addition, because employing inductance L, under the higher hamonic wave of Switching Power Supply pfc circuit and main power stage so that electricity
Hold CA1 and CA2 individual absorption higher hamonic wave, be unfavorable for the raising of electromagnetic compatibility (EMC) performance.
Summary of the invention
In view of this, the invention solves the problems that the deficiency that the Switching Power Supply of existing band APFC exists, carry
Switching Power Supply for a kind of band APFC, it is achieved in electrolytic capacitor filter complete failure premise for instruction, simultaneously
Do not use π type filter circuit, there is not the inductance L and electric capacity CA1 affecting EMC performance, realize in Switching Power Supply with lower cost
Informing in advance before complete failure.
The object of the present invention is achieved like this, the Switching Power Supply of a kind of band APFC, including power because of
Number correcting circuit, filter circuit, main power stage, an indicating circuit with two terminals, exchange input is through power factor school
It is in parallel that positive circuit connects filter circuit, filter circuit and main power stage, at least includes one with main power stage also in filter circuit
The electrochemical capacitor of connection, is characterized in that: indicating circuit is in parallel with electrochemical capacitor.
Preferably, indicating circuit scheme one includes the first resistance, the first electric capacity, the first diode and the first light-emitting diodes
Pipe, the first resistance and the first diode and these three the device parallel connections of the first light emitting diode, wherein the first light emitting diode and
First diode reverse is in parallel, and the two-terminal network formed after parallel connection is referred to as parallel network, and the terminal of parallel network is with first
The anode of diode, the negative electrode of the first diode make a distinction, parallel network again with the first capacitances in series, and form a series connection
Two-terminal network, the two-terminal network of described series connection is referred to as series network, and two terminals of series network are respectively
One terminal, the second terminal.
Preferably, indicating circuit scheme two includes the first resistance, the second resistance；First electric capacity, the second electric capacity；One or two pole
Pipe and the second diode and the first light emitting diode；Its annexation is: the second resistance and the series connection of the first light emitting diode,
Form the first network with two-terminal, first network and the second electric capacity and the first resistance the most in parallel, formed and there is two-terminal
The second network, the second network again with the second Diode series, formed and there is the 3rd network of two-terminal, the feature of the 3rd network
It is that the second diode and the first light emitting diode are in the same direction；3rd network and the first diode reverse are in parallel, are formed and have two ends
Son the 4th network, the 4th network again with the first capacitances in series, and formed one series connection two-terminal network, described series connection
Two-terminal network is referred to as series network, and two terminals of series network are respectively the first terminal, the second terminal.
Operation principle will in conjunction with the embodiments, is explained in detail.
The invention have the benefit that
Cost is lower than the prior art using π type filter circuit, there is not the inductance L affecting EMC performance, does not the most deposit electric capacity
CA1, low cost, volume is little, realizes equally: before electrochemical capacitor lost efficacy, in this display lamp lumination of light emitting diode or optocoupler
Light emitting diode has electric current to flow through, and optocoupler exports the signal of an isolation with prompting user or other circuit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the PFC part of the Switching Power Supply of existing APFC；
Fig. 2 is the schematic diagram of the Switching Power Supply of the band APFC of existing patent A；
Fig. 3 is the schematic diagram of the Switching Power Supply of the band APFC of first embodiment of the invention；
Fig. 4 is main power stage switching tube driving voltage and exciting curent sequential chart in first embodiment；
Fig. 5 be in first embodiment PFC to electrolysis charging, the exciting curent i of main power stageMPath schematic diagram；
Fig. 6 is the equivalent circuit diagram that the high frequency charge and discharge electric current of the main power stage of Fig. 5 is relevant；
Fig. 7-1 is embodiment one schematic diagram of indicating circuit scheme one correspondence of the present invention；
Fig. 7-2 is embodiment two schematic diagram of indicating circuit scheme one correspondence of the present invention；
Fig. 7-3 is embodiment three schematic diagram of indicating circuit scheme one correspondence of the present invention；
Fig. 7-4 is embodiment four schematic diagram of indicating circuit scheme one correspondence of the present invention；
Fig. 7-5 is embodiment five schematic diagram of indicating circuit scheme one correspondence of the present invention；
Fig. 7-6 is embodiment six schematic diagram of indicating circuit scheme one correspondence of the present invention；
Fig. 8 is the schematic diagram of the Switching Power Supply of the band APFC of second embodiment of the invention；
Fig. 8-1 is embodiment one schematic diagram of indicating circuit scheme two correspondence of the present invention；
Fig. 8-2 is embodiment two schematic diagram of indicating circuit scheme two correspondence of the present invention；
Fig. 8-3 is embodiment three schematic diagram of indicating circuit scheme two correspondence of the present invention；
Fig. 8-4 is embodiment four schematic diagram of indicating circuit scheme two correspondence of the present invention；
Fig. 9 is the schematic diagram of the Switching Power Supply of the band APFC of third embodiment of the invention.
Detailed description of the invention
First embodiment
Fig. 3 shows first embodiment of the invention, for the schematic diagram of the Switching Power Supply of band APFC, including
Circuit of power factor correction PFC, filter circuit 200, main power stage 300, an indicating circuit 400 with two terminals, hand over
It is in parallel that stream input IN connects filter circuit 200, filter circuit 200 and main power stage 300 through circuit of power factor correction PFC, filter
Wave circuit at least includes an electrochemical capacitor CA2 in parallel with main power stage, it is characterized in that: indicating circuit 400 and electrolysis electricity
Holding CA2 in parallel, indicating circuit 400 at least includes the first resistance R1, the first electric capacity C1, the first diode D1 and the first light-emitting diodes
Pipe LED.
Scheme one: the first resistance R1 of indicating circuit, the first electric capacity C1, the first diode D1 and the first light emitting diode
LED, the first resistance R1 and the first diode D1 and these three the device parallel connections of the first LED, wherein first is luminous
Diode (LED) and the first diode D1 reverse parallel connection, the two-terminal network formed after parallel connection is referred to as parallel network 24, parallel-connection network
The terminal of network 24 makes a distinction with anode, the negative electrode of the first diode D1 of the first diode D1, and parallel network 24 is again with first
Electric capacity C1 connects, and forms the two-terminal network of a series connection, and the two-terminal network of described series connection is referred to as series network, just
Being indicating circuit 400, two terminals of series network 400 are respectively the first terminal the 1, second terminal 2, and this series network 400 is also
It it is the function body of the Switching Power Supply of the band APFC of the present invention.
First electric capacity C1 hereinafter referred to as C1, the first resistance R1 hereinafter referred to as R1, letter below the first LED
Being referred to as LED, other device is similar.
LED uses Φ 3mm red highlighted, and for convenience, light emitting diode is referred to as luminous tube, and model is 3AR2UD,
Electric capacity C1 is the patch capacitor of 333/630V, nominal capacity be 0.033uF, D1 be 1N4148, R1 be the Chip-R of 12K, press
Fig. 3 forms the Switching Power Supply of band APFC, employs 120W power supply, and model is LI 120-10B12, its master control
Chip uses TEA1716, and its filtering electrolysis CA2 is 150uF/400V, and for domestic quality capacitance, PFC operating frequency is 60-
100KHz, its main power stage is LLC circuit, and operating frequency is 100-120KHz.
It is noted that yes: in Fig. 3, indicating circuit 400 is directly in parallel with electrolysis CA2 in Switching Power Supply, and forward is in parallel or reverse
Parallel connection can, forward is in parallel: i.e. terminal 1 connects the positive pole of filtering electrolysis, and terminal 2 connects the negative pole of filtering electrolysis；Or reversely
In parallel: terminal 1 connects the negative pole of filtering electrolysis, terminal 2 connects the positive pole of filtering electrolysis.Hereafter can explain specially.
When first embodiment is solded into forward parallel way, survey each side index of this power supply, all identical with before,
Particularly conversion efficiency, do not have occur it is observed that decline, remain at 93.7%, and luminous tube LED be the most luminous.
In order to verify that the present invention can work, inventor have employed method pioneering before and tests the first enforcement
Example:
Electrochemical capacitor owing to losing efficacy is difficult to find, and in above-mentioned filtering electrochemical capacitor, seals in adjustable resistance, carrys out mould
Intending the electrochemical capacitor that performance has declined, adjustable resistance adjustable extent here is 0-39 Ω, when the resistance of adjustable resistance
When being transferred to 5.1 Ω, be equivalent to the ESR of electrochemical capacitor of 150uF/400V about 0.4 Ω when non-defective unit and have risen to 5.5 Ω,
The performance of electrochemical capacitor is close to non-serviceable edge.
Now, the luminous tube LED in Fig. 3 is luminous, and the meansigma methods actual measurement of operating current is 1.9mA.
By choosing the electric capacity C1 of different capabilities, the sensitivity of preliminary regulation instruction, the capacity of electric capacity C1 is little, sensitivity
Low；The capacity of electric capacity C1 is big, highly sensitive.Owing to luminous tube is when luminescence, there is the forward voltage drop of 1.6V to 2.2V, Ke Yi
Luminous tube LED two ends parallel resistance R1 regulates sensitivity, and as in this example, R1 is according to the resistance of 1.6K, then, below 1mA
The voltage that produces at R1 two ends of peak point current at below 1.6V, at this moment luminous tube LED is the most luminous.
Note: the conduction voltage drop of white-light emitting pipe is about 3.0V, red is the most different from green, and sending out within optocoupler
Light device conduction voltage drop is about 1.1V.
Operation principle: see Fig. 3, when electrochemical capacitor is normal, then its ESR is 0.4 Ω, filtering electrolysis CA2 two ends
Ripple current have three kinds, when Switching Power Supply is fully loaded with work as a example by explanation.
A kind of is the electric current to electrolysis CA2 charging, and from pfc circuit, PFC operating frequency is 60-100KHz, i.e. charges
The frequency of electric current is interval at 60-100KHz；Main power stage 300 is discharged by the second for electrolysis CA2, and the electric current of electric discharge is main power
The exciting curent of level 300, its operating frequency is that 100-120KHz, i.e. discharge and recharge are high frequency ripple current；The third: is at CA2
Two ends, by the existing theory of PFC, there is also the low-frequency ripple of a pfc circuit output, its frequency is the civil power frequency of input IN
Rate 2 times, and be the sine wave of standard, the referred to as 2 times big ripples of power frequency, are in fact the envelope of the first, the i.e. high frequency of the first
Ripple current is by the filtered low-frequency ripple of CA2, and pfc circuit requires electric current and the output of arc in phase, i.e. pfc circuit of input
Power is the product of voltage and electric current, two sinusoidal products be the cosine of 2 frequencys multiplication plus a constant, constant is directly
Stream deal.
The exciting curent i of main power stageMAs shown in Figure 4, wherein, Ugs be main power stage breaker in middle Guan Shangguan grid with
The driving voltage of source electrode, exciting curent iMPath see Fig. 5, charging current is also high frequency electric: form loop from PFC to CA2.
Owing to C1 capacity is less, for 0.033uF, comparing the 150uF of CA2, charging, discharge current in C1 are only CA2's
The charging of 2/10000ths, CA2, discharge current are about 0.34A, then, flow through the charging of C1, discharge current is only 0.07mA, this
Time, LED is the most luminous because there is R1.
Electrolysis CA2 capacitive reactance under the switching frequency of 60KHz is 1/ (2 π fC), calculates as 17.7m Ω, much smaller than it
ESR, under 60KHz, ESR plays a major role；Waveform shown in Fig. 4 is not sinusoidal wave, and its first-harmonic is sinusoidal wave, its harmonic frequency
All high than 60KHz, so merely just estimating.
To CA2 charging and discharging electric current, it is generically and collectively referred to as iALL, pressure drop that this electric current is formed on the ESR of CA2, see Fig. 6,
For U=IR=0.34 × 0.4=0.136V.The most in figure 6, there is the high frequency ripple of a fluctuation, its ripple between terminal 1 and 2
Shape shape is with i in Fig. 4MWaveform, this is discharge waveform, it is true that there is also charge waveforms, complicated more than the waveform in Fig. 4,
Obviously the meansigma methods of 0.136V is not enough to allow LED conducting and luminous.
About 0.4 Ω when the ESR of electrolysis CA2 is from non-defective unit has risen to 5.5 Ω, i.e. electrolysis CA2 is close to inefficacy limit
Edge.The pressure drop that this charge and discharge electric current is formed on the ESR of CA2, as a example by discharge current, sees Fig. 6, for U=IR=0.34
× 5.5=1.87V.The most in figure 6, there is the high frequency ripple of a fluctuation between terminal 1 and 2, its waveform shape is with i in Fig. 4M
Waveform, it is clear that 1.87V is meansigma methods, and peak value is about its 1.4 to 2 times, about 3.2V, and this voltage is after C1, it is sufficient to allow
LED conducting and luminous.
C1 is 0.033uF, and its capacity is less, but under the frequency of 60KHz, its capacitive reactance is 80.4 Ω, can be that LED provides
Enough operating currents and luminous, and rise metering function, regulate its capacity and can obtain different operating currents.
The operation principle of the present invention not very complexity, the capacity of C1 is little, and C1 has logical high frequency, the effect of resistance low frequency；CA2's
Two ends, by the existing theory of PFC, there is also the low-frequency ripple of a pfc circuit output, and its frequency is the mains frequency of input IN
2 times, and be the sine wave of standard, the referred to as 2 times big ripples of power frequency, the 2 times of big ripples of power frequency that pfc circuit the causes electric current by C1
Minimum, the pressure drop produced on resistance R1 is not enough to light LED, and along with the ESR rise of electrolysis CA2, the high frequency of power stage 300
The pressure drop that the high frequency charging current of exciting curent and PFC produces on ESR synchronizes to raise, and the high frequency ripple voltage of formation is along with electricity
Solving the aging of CA2 and raise, C1 has the effect of logical high frequency, when the high frequency ripple voltage on ESR arrives certain threshold values, and can point
Bright LED and luminous, the resistance of regulation R1 can regulate the size of threshold values, i.e. high frequency ripple voltage by the electric current of electric capacity C1 at R1
The pressure drop that two ends the are formed conducting voltage less than LED, LED is not turned on, and LED also cannot shunt thus the most luminous for R1.
The obtaining value method of C1: the power frequency 2 of civil power is up to 120Hz again, the operating frequency of current Switching Power Supply is typically can
Listen outside audio frequency, for 22KHz, then, the ratio of frequency is (22000/120)=183.3 times, and the value of C1 is at monitored electricity
Solve less than 1/the 183.3 of electric capacity CA2.If CA2 is 150uF, then C1 should be at (150uF/183.3)=0.818uF
Hereinafter, owing to the nominal value of electric capacity is by series values such as E-3, E-6, E-12, below 0.82uF can be taken here.
So driven for emitting lights pipe LED luminescence realizes goal of the invention, reminds user: the ESR of this electrolysis CA2 has risen to
Focus, in order to user determines next step measure.In this example, the load of the Switching Power Supply of band APFC
Being down to 30%, LED is the most luminous, and operating current is down to 0.45mA, and the luminous tube using high brightness is the most eye-catching.
Now, electrochemical capacitor remains to work, but owing to the exciting curent of main power stage exists bigger caloric value on ESR,
Being 0.24W in this example, this electrochemical capacitor has been under golf calorific value, in accelerating aging, generally, and can be little tens
In hundreds of hour, ESR rapid increase, cause heating to strengthen further, until losing efficacy, capacity is lost, thus causes as opened
Close a series of inefficacies such as pipe demolition.
C1 and parallel network 24 series connection explanation: C1 and parallel network 24 are connected, owing to being series loop, merit after transposition
Can be identical, so the series system that the scheme one of indicating circuit includes has multiple, but function is the most identical, as following:
A the negative electrode of () D1 is downward, on top, as shown in Fig. 7-1 of 400 or independent in Fig. 3, the anode of D1 is even for C1
Connecing one end of C1, the other end of C1 is the first terminal 1 of indicating circuit, and the negative electrode of D1 is the first terminal 2 of indicating circuit；
B the negative electrode of () D1 is downward, C1 is below, and as shown in Fig. 7-2, the negative electrode of D1 connects one end of C1, and the anode of D1 is
The first terminal 1 of indicating circuit, the other end of C1 is the second terminal 2 of indicating circuit；
C upwards, on top, as shown in Fig. 7-3, the negative electrode of D1 connects one end of C1, the other end of C1 to C1 to the negative electrode of () D1
Terminal 1 for indicating circuit；The anode of D1 is the terminal 2 of indicating circuit；It is true that this mode with the Fig. 7-2 of above-mentioned (b) is
Identical, the terminal of (b) mode 1 equal to the terminal 2 of (c), the terminal 2 of (b) mode equal to the terminal 1 of (c), i.e. Fig. 7-
The terminal 1 and 2 of 3 exchanges, the most identical with (b) of Fig. 7-2；
D upwards, C1 is below, and as shown in Fig. 7-4, the anode of D1 connects one end of C1, the other end of C1 for the negative electrode of () D1
Terminal 2 for indicating circuit；The negative electrode of D1 is the terminal 1 of indicating circuit；It is true that this (a) mode with above-mentioned Fig. 7-1 is
Identical, the terminal 1 of (a) mode is equal to the terminal 2 of (d), and the terminal 2 of (a) mode is equal to the terminal 1 of (d), i.e. (d)
The 1 of mode and 2 exchange, the most identical with (a) of Fig. 7-1.
I.e. real effective connected mode only has (a) of above-mentioned Fig. 7-1 and (b) mode of Fig. 7-2, electric capacity C1 and network
24 series connection, owing to being series loop, after device transposition, function is identical, and this is known technology, and (b) mode of Fig. 7-2 is exactly
C1 and network 24 transposition of (a) mode of Fig. 7-1, the most substantially, (b) mode of (a) of Fig. 7-1 and Fig. 7-2
It is equivalent.The i.e. scheme one of indicating circuit includes above-mentioned four kind connected mode.
It addition, electric capacity C1 can obtain by two capacitances in series, then, the electric capacity C1 of Fig. 7-1, go here and there with electric capacity C1a and C1b
Connection substitutes, and just obtains the embodiment of Fig. 7-5, and the circuit of Fig. 7-1 and the circuit of Fig. 7-5 are equivalent.As previously mentioned, string
Connection loop, after device transposition, function is identical, further, electric capacity C1b and network 24 transposition, just obtains figure
Embodiment shown in 7-6.
The circuit of Fig. 7-2, the circuit of Fig. 7-3, the circuit of Fig. 7-4, the circuit of Fig. 7-5, the circuit of Fig. 7-6 are replaced Fig. 3
Middle indicating circuit 400, can normally work, it is seen then that six circuit of first embodiment can realize goal of the invention.Fig. 7-6
Circuit replace the embodiment that in Fig. 2, indicating circuit 400 obtains, have its advantage: when the switching frequency of power supply is higher, electricity
Hold C1a and C1b respectively the most on top and below, and capacity be the least, it is possible to achieve light emitting diode and the electrical isolation of Switching Power Supply,
Because the frequency of civil power is low, it is easily controlled below limit value by the leakage current of electric capacity C1a and C1b that to realize safety up to standard.
Equally, power stage 300 is changed to the power stage of common power supply adapter for notebook computer by LLC circuit, generally:
Power 65W, main control chip is NCP1234, flyback topologies, and output voltage is 19V, 3.42A, and has removed its current rectifying and wave filtering circuit,
Only retain power stage.Regulation R1 is 22K, the present invention shown in Fig. 3, i.e. the Switching Power Supply of band APFC is the most real
Existing goal of the invention.In Fig. 3, power stage can also be replaced by semi-bridge alternation circuit, or single tube forward converter, or full-bridge circuit, real
Slowdown monitoring circuit is possible to goal of the invention；Pfc circuit is replaced by buck pfc circuit, and circuit also can normally work.
In fact in the content of first embodiment, include numerous embodiments, in order to save length, only total with one
" first embodiment " is summarized, and is a series embodiment in fact.The electric current flowing through luminous tube LED in first embodiment is not straight
Stream electricity, but with PFC, power stage 300 with high frequency superimposed current frequency, complicated, when the lead-in wire of LED is longer, its electromagnetism spoke
Penetrate and can not be ignored；When luminous tube LED being changed into the luminous organ in optocoupler, the output electric current of optocoupler is also periodically to occur, is not
One stable signal, this can cause trouble to follow-up circuit.Second embodiment shows solution.
Second embodiment
Second embodiment sees Fig. 8, Fig. 8 and shows first embodiment of the invention, for opening of band APFC
Closing the schematic diagram of power supply, including circuit of power factor correction PFC, filter circuit 200, main power stage 300, one has two ends
The indicating circuit 400 of son, exchange input IN connects filter circuit 200, filter circuit 200 He through circuit of power factor correction PFC
Main power stage 300 is in parallel, at least includes an electrochemical capacitor CA2 in parallel with main power stage, it is characterized in that: refer in filter circuit
Showing that circuit 400 is in parallel with electrochemical capacitor CA2, indicating circuit 400 at least includes the first resistance R1, the first electric capacity C1, the one or two pole
Pipe D1 and the first LED.
Indicating circuit uses scheme two: indicating circuit 400 also includes the second resistance R2, the second electric capacity C2, the second diode
D2；If putting together description, it is: indicating circuit 400 includes the first resistance R1, the second resistance R2；First electric capacity C1, the second electricity
Hold C2；First diode D1 and the second diode D2 and the first LED；Its annexation is: the second resistance R2
Connect with the first LED, form the first network 21 with two-terminal, for sake of simplicity, the indicating circuit in Fig. 8
400 is independent, sees Fig. 8-1, and first network 21 is the most in parallel with the second electric capacity C2 and the first resistance R1, is formed and has two ends
Second network 22 of son, the second network 22 connect with the second diode D2 again, and formation has the 3rd network 23 of two-terminal, and the 3rd
The feature of network 23 is, the second diode D2 and the first LED are in the same direction；3rd network 23 and the first diode D1
Reverse parallel connection, forms the 4th network 24 with two-terminal, and the 4th network 24 is connected with the first electric capacity C1, and formed a string
The two-terminal network of connection, it is simply that indicating circuit 400, the two-terminal network 400 referred to as series network of described series connection, net of connecting
Two terminals of network 400 are respectively the first terminal the 1, second terminal 2, this series network 400 be also band active power of the present invention because of
The function body of the Switching Power Supply of number correction.
Main power stage 300 have employed circuit of reversed excitation topology.
Second diode D2 and the first LED are in the same direction: in the 3rd network 23, it is assumed that R1 opens a way, electric capacity C2
For direct current, be equivalent to open circuit, then, the electric current flowed into from the 3rd network 23 lower end, after LED, then through D2, from
3rd network 23 upper end is flowed out, D2 and LED, all in forward conduction state, this series system, cries in the same direction.D2 and LED locates
In forward conduction state, being equivalent to the diode that pressure drop is bigger, its negative electrode is exactly the negative electrode of the 3rd network 23, unidirectional current
Stream can flow outwardly from the negative electrode of network, and its anode is exactly the anode of the 3rd network 23, and DC current can be from network
Anode flows inward into.
3rd network 23 and the first diode D1 reverse parallel connection, it is simply that refer to: the 3rd network 23 negative electrode connects the anode of D1, the
The anode of three networks 23 connects the negative electrode of D1.
Operation principle: see Fig. 8, when being electrolysed CA2 and being normal, is about 0.5 Ω for 68uF/400V, its ESR, is electrolysed CA2 two
The ripple current of end has three kinds, and the first is the pfc circuit high frequency electric to electrolysis CA2 charging, and frequency is 60-100KHz；The
Two kinds of high frequency electrics discharged main power stage 300 for electrolysis CA2, frequency is 65KHz；The third is the high frequency ripple of the first
Electric current is by the filtered low-frequency ripple of CA2, for the sine wave of standard, 2 times of big ripples of power frequency.
C1 capacity is less, and under the low frequency of 2 times of big ripples of power frequency, for 100Hz or 120Hz, the capacitive reactance of C1 is big, flows through C1's
Electric current is minimum, and after D2 rectification, after C2 filtering, the undertension formed at the two ends of R1 is to light LED.
And along with the ESR rise of electrolysis CA2, the pressure drop that the high-frequency excitation electric current of power stage 300 produces on ESR synchronizes to rise
Height, the high frequency ripple voltage of formation raises along with the aging of electrolysis CA2, and C1 has the effect of logical high frequency, the high frequency stricture of vagina on ESR
When wave voltage arrives certain threshold values, after D2 rectification, C2 filtering, the voltage formed at the two ends of R1 be enough to light LED, R2
Play metering function.
So, the electric current flowing through luminous tube LED is pure unidirectional current, and its electromagnetic radiation directly reduces to zero, luminous tube
When LED changes the luminous organ in optocoupler into, the output electric current of optocoupler is also the most stable direct current signal, and this can be to follow-up circuit
Offer convenience.
Component parameters is: CA2 just for 68uF/400V, C1 be the patch capacitor of 473/630V, nominal capacity is 0.047uF,
C2 is the patch capacitor of 104/16V, D1 and D2 be 1N4148, R2 be 1K, R1 be 10K, LED be 3AR2UD.Power stage 300 is
The power stage of common power supply adapter for notebook computer, generally: power 65W, main control chip is NCP1234, and flyback topologies is defeated
Going out voltage is 19V, 3.42A, and has removed its current rectifying and wave filtering circuit, only retains power stage.
When the load of Switching Power Supply is 100%, when the ESR rise of electrolysis CL is to 5 Ω, the electric current in LED is 1.2mA；?
The load of the Switching Power Supply with APFC is down to 30%, and LED is the most luminous, and operating current is down to 0.32mA, uses
The luminous tube of high brightness is the most eye-catching.So driven for emitting lights pipe LED luminescence realizes goal of the invention, prompting user: this electricity
The ESR solving CA2 has risen to focus, in order to user determines next step measure.
Second embodiment also has numerous embodiments, constitutes series of embodiments, and the R2 in network 21 exists with LED strip connection
Two kinds of connected modes:
A the negative electrode of () LED is connected with one end of R2, see shown in the network 21 in Fig. 8-1；
B the anode of () LED is connected with one end of R2, see shown in Fig. 8-2；
Both is equivalent.Network 21 is the most in parallel with C2 with R1, forms the network 22 with two-terminal, and network 22 is again
Connecting with diode D2, in network 22, it is assumed that R1 opens a way, electric capacity C2, for direct current, is equivalent to open circuit, then network 22 phase
When in a diode, having unilateal conduction performance, the negative electrode side of LED is exactly the negative electrode of the second network 22, unidirectional current
Stream can flow outwardly from the negative electrode of network, and the anode side of LED is exactly the anode of the 3rd network 23, and DC current is permissible
Flow inward into from the anode of network.Owing to being defined to series aiding connection, network 22 and D2 there is also two ways:
A the negative electrode of () network 22 is connected with the sun of D2, see shown in Fig. 8-1；
B the anode of () network 22 is connected with the moon of D2, see shown in Fig. 8-3；
4th network 24 is connected with the first electric capacity C1 again, there is also two ways:
A the D1 anode of () network 24 is connected with C1 one end, see shown in Fig. 8-1；
B the D1 negative electrode of () network 24 is connected with C1 one end, see shown in Fig. 8-2；
In second embodiment, 3 independent series connection in indicating circuit 400, each series connection has two ways, 3 times of totally 2
Side, totally 8 kinds of connected modes, they are equivalent.
It is true that resistance R1 as Fig. 8-4, from original in parallel with C2, change in parallel with D1, realize invention equally
Purpose, R1 equally regulates the size of threshold values, owing to having provided technology enlightenment in scheme one, the most no longer comes by technical scheme
Carry out rights protection.
The circuit of Fig. 8-2, the circuit of Fig. 8-3, the circuit of Fig. 8-4 are replaced indicating circuit 400 in Fig. 8, can be normal
Work, it is seen then that the circuit of 8 kinds of modes of the second embodiment can realize goal of the invention.
Visible, the present invention can solve the problems of the prior art really, with having that less element, cost acquisition are wanted
Benefit effect.Shown in 3rd embodiment, it is power stage 300 and filter circuit 200 all to be changed into other embodiment simultaneously.
3rd embodiment
Asking for an interview and see Fig. 9, Fig. 9 shows the Switching Power Supply of the band APFC of third embodiment of the invention
Schematic diagram, including circuit of power factor correction PFC, filter circuit 200, main power stage 300, an instruction with two terminals
Circuit 400, exchange input IN connects filter circuit 200, filter circuit 200 and main power stage through circuit of power factor correction PFC
300 is in parallel, at least includes an electrochemical capacitor CA2 in parallel with main power stage, it is characterized in that: indicating circuit in filter circuit
400 is in parallel with electrochemical capacitor CA2, indicating circuit 400 at least include the first resistance R1, the first electric capacity C1, the first diode D1 and
First LED.
Indicating circuit uses scheme one: indicating circuit includes the first resistance R1, the first electric capacity C1, the first diode D1 and the
One LED, the first resistance R1 and the first diode D1 and these three the device parallel connections of the first LED,
Wherein the first LED and the first diode D1 reverse parallel connection, the two-terminal network formed after parallel connection referred to as parallel connection
Network 24, the terminal of parallel network 24 makes a distinction with anode, the negative electrode of the first diode D1 of the first diode D1, parallel-connection network
Network 24 is connected with the first electric capacity C1 again, and forms the two-terminal network of a series connection, and the two-terminal network of described series connection is called for short
For series network, it is simply that indicating circuit 400, two terminals of series network 400 are respectively the first terminal the 1, second terminal 2, should
Series network 400 is also the function body of the Switching Power Supply of band APFC of the present invention.
Filter circuit 200 and main power stage 300 are in parallel, are careful not to connect instead, it is ensured that main power stage 300 does not connect time in parallel
Instead, these are for those skilled in the art, are basic skill.
The main power stage of the present embodiment 300 is half-bridge circuit, in order to adapt to the connected mode of half-bridge circuit, and filter circuit 200
Relatively low pressure electrochemical capacitor CA21, CA22 identical by two capacity is in series, and junction point is connected on half-bridge circuit, figure
In do not draw the equalizing resistance in parallel with electrochemical capacitor；C31 is the coupling electric capacity improving bias magnet properties, another of transformator B
While be general output rectification circuit.
Indicating circuit 400 is in parallel with electrolysis CA2, and electrolysis CA2 is that electrochemical capacitor CA21, CA22 are in series, based on first
The operation principle of embodiment, the 3rd embodiment realizes goal of the invention equally.
Equally, the circuit of Fig. 7-2, the circuit of Fig. 7-3, the circuit of Fig. 7-4, the circuit of Fig. 7-5, the circuit of Fig. 7-6, figure
The circuit of 8-1, the circuit of Fig. 8-2, the circuit of Fig. 8-3, the circuit of Fig. 8-4 replace indicating circuit 400 in Fig. 9, can be normal
Work.
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
Some improvements and modifications can be made, as by the light emitting diode in the luminous organ in optocoupler, i.e. optocoupler as the first luminescence two
Pole is managed；Also sealing in resistance in the first diode, these improvements and modifications also should be regarded as protection scope of the present invention, the most no longer
Repeating by embodiment, protection scope of the present invention should be as the criterion with claim limited range.
Claims (7)
1. a Switching Power Supply for band APFC, including circuit of power factor correction, filter circuit, main power
Level, an indicating circuit with two terminals, exchange input connects filter circuit, filter circuit through circuit of power factor correction
In parallel with main power stage, filter circuit at least includes an electrochemical capacitor in parallel with main power stage, it is characterised in that: instruction
Circuit is in parallel with electrochemical capacitor.
The Switching Power Supply of band APFC the most according to claim 1, it is characterised in that: indicating circuit includes
First resistance, the first electric capacity, the first diode and the first light emitting diode, the first resistance and the first diode and the first luminescence two
This three device parallel connections are managed in pole, and wherein the first light emitting diode and the first diode reverse are in parallel, the two ends formed after parallel connection
Sub-network is referred to as parallel network, and the terminal of parallel network carries out district with the anode of the first diode, the negative electrode of the first diode
Point, parallel network again with the first capacitances in series, and formed one series connection two-terminal network, the two-terminal network of described series connection
Referred to as series network, two terminals of series network are respectively the first terminal, the second terminal.
The Switching Power Supply of band APFC the most according to claim 2, it is characterised in that: also include another electricity
Holding, another electric capacity also connects with parallel network, and another electric capacity and the first electric capacity respectively with two terminal phases of series network
Connect.
The Switching Power Supply of band APFC the most according to claim 1, it is characterised in that: indicating circuit includes
First resistance, the second resistance；First electric capacity, the second electric capacity；First diode and the second diode and the first light-emitting diodes
Pipe；Its annexation is: the second resistance and the series connection of the first light emitting diode, forms the first network with two-terminal, the first net
Network and the second electric capacity and the first resistance are the most in parallel, form second network with two-terminal, the second network again with the two or two pole
Pipe is connected, and forms the 3rd network with two-terminal, and the feature of the 3rd network is, the second diode and the first light emitting diode are
In the same direction；3rd network and the first diode reverse are in parallel, form the 4th network with two-terminal, and the 4th network is electric with first again
Holding series connection, and form a two-terminal network connected, the two-terminal network of described series connection is referred to as series network, net of connecting
Two terminals of network are respectively the first terminal, the second terminal.
The Switching Power Supply of band APFC the most according to claim 4, it is characterised in that: the first resistance is changed
For with the first diodes in parallel.
The Switching Power Supply of band APFC the most according to claim 4, it is characterised in that: also include another electricity
Hold, another electric capacity also with the 4th series network, and another electric capacity and the first electric capacity respectively with two terminal phases of series network
Connect.
7. according to the Switching Power Supply of the band APFC described in any one of claim 2-6, it is characterised in that: first
Light emitting diode is the light emitting diode in the luminous organ in optocoupler, i.e. optocoupler.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610639654.8A CN106208759B (en) | 2016-08-05 | 2016-08-05 | A kind of Switching Power Supply with active power factor correction |
| PCT/CN2017/088001 WO2018024036A1 (en) | 2016-08-05 | 2017-06-13 | Switching power supply having source power factor correction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610639654.8A CN106208759B (en) | 2016-08-05 | 2016-08-05 | A kind of Switching Power Supply with active power factor correction |
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| CN106208759B CN106208759B (en) | 2019-04-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018024036A1 (en) * | 2016-08-05 | 2018-02-08 | 广州金升阳科技有限公司 | Switching power supply having source power factor correction |
| CN110535351A (en) * | 2019-09-16 | 2019-12-03 | 江苏华电戚墅堰发电有限公司 | DC power supply reliability of service life promotes circuit |
| CN112758112A (en) * | 2021-01-21 | 2021-05-07 | 中车青岛四方机车车辆股份有限公司 | Urban rail train power supply processing method, device and system, storage medium and processor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108513407B (en) * | 2018-05-04 | 2024-05-07 | 深圳市必易微电子股份有限公司 | Low-frequency ripple suppression circuit and control method |
| CN109617389A (en) * | 2019-01-28 | 2019-04-12 | 湖南晟和电源科技有限公司 | Type I special variable high power factor power supply circuit, power supply method and metering instrument |
| CN113992027B (en) * | 2021-10-26 | 2023-09-08 | 珠海格力电器股份有限公司 | Isolation switch power supply control circuit, method and device and isolation switch power supply |
| CN114925007A (en) * | 2022-06-09 | 2022-08-19 | 盈帜科技（常州）有限公司 | Signal conversion circuit |
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| US7855514B2 (en) * | 2007-05-24 | 2010-12-21 | Yfc-Boneagle Electric Co., Ltd. | LED indicator device for AC power plug or socket |
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| CN106208759B (en) * | 2016-08-05 | 2019-04-19 | 广州金升阳科技有限公司 | A kind of Switching Power Supply with active power factor correction |
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- 2016-08-05 CN CN201610639654.8A patent/CN106208759B/en active Active
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| US7855514B2 (en) * | 2007-05-24 | 2010-12-21 | Yfc-Boneagle Electric Co., Ltd. | LED indicator device for AC power plug or socket |
| CN202975207U (en) * | 2012-12-13 | 2013-06-05 | 上海辰光医疗科技股份有限公司 | Failure detecting circuit for common-mode signal suppression devices |
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| WO2018024036A1 (en) * | 2016-08-05 | 2018-02-08 | 广州金升阳科技有限公司 | Switching power supply having source power factor correction |
| CN110535351A (en) * | 2019-09-16 | 2019-12-03 | 江苏华电戚墅堰发电有限公司 | DC power supply reliability of service life promotes circuit |
| CN110535351B (en) * | 2019-09-16 | 2024-01-26 | 江苏华电戚墅堰发电有限公司 | Circuit for improving service life reliability of direct-current power supply |
| CN112758112A (en) * | 2021-01-21 | 2021-05-07 | 中车青岛四方机车车辆股份有限公司 | Urban rail train power supply processing method, device and system, storage medium and processor |
| CN112758112B (en) * | 2021-01-21 | 2022-07-15 | 中车青岛四方机车车辆股份有限公司 | Urban rail train power supply processing method, device and system, storage medium and processor |
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| Publication number | Publication date |
|---|---|
| WO2018024036A1 (en) | 2018-02-08 |
| CN106208759B (en) | 2019-04-19 |
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