CN104135147B - A kind of simultaneous switching circuit of PFC - Google Patents
A kind of simultaneous switching circuit of PFC Download PDFInfo
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- CN104135147B CN104135147B CN201410369643.3A CN201410369643A CN104135147B CN 104135147 B CN104135147 B CN 104135147B CN 201410369643 A CN201410369643 A CN 201410369643A CN 104135147 B CN104135147 B CN 104135147B
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- 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
Abstract
A kind of synchro switch of PFC, detection circuit is constituted by PNP type triode T1 and peripheral resistance R1, R2, electric capacity C1, the lower end of resistance R1 connects the pfc circuit front end of BOOST, that is in the output of rectifier bridge before PFC, the input filter capacitor of pfc circuit, and the emitter stage of audion T1 is connected on the output high pressure of PFC, the voltage difference that boosting when being worked using the pfc circuit of BOOST is produced allows audion T1 to turn on, N-channel MOS pipe Q1, metal-oxide-semiconductor Q1 conductings are driven by resistance R3.Relative to prior art, PFC of the present invention with synchro switch due to using transistor circuit come realize switch synchronizing function, reduce the volume of synchro switch, fast response time, and entirely eliminated the arcing factor of contact in the relay of existing synchro switch, so as to be entirely capable of meeting high request of the high risk industries such as colliery to electrical safety, it is particularly well-suited in the intelligent pfc circuit that PFC output voltages change with input ac voltage as synchro switch, goes to control the various Switching Power Supply of auxiliary.
Description
Technical field
The present invention relates to the Switching Power Supply with PFC, more particularly to rear class are present in multi-channel converter system in parallel, to auxiliary
The simultaneous switching circuit that road uses.
Background technology
With further requirement of the national standard to the power factor of electrical appliance, to exchange more than power consumption 75W
The Switching Power Supply of power supply all power factors (PF) requires, that is, require circuit operating current waveform is basic and voltage waveform phase
Together.
There is now circuit of power factor correction and solve this problem, circuit of power factor correction is referred to as pfc circuit, is
The abbreviation of Power Factor Correction.
Note：75W Data Sources are in CNS GB17625.1-1998, entitled《Low-voltage electrical and electronic equipment are sent out
The Harmonic Current Limits for going out (equipment is per phase input current≤16A)》.
Traditional BOOST power factor correctors have solved this problem well, and its operation principle may refer to
Electronic Industry Press《The principle of Switching Power Supply and design》Page 190, page 191, book ISBN 7-121-00211-6.
LLC changers (LLC resonant are added using PFC (the Power Factor Correction) circuit of BOOST
Converter), power factor can be allowed more than 0.95, and conversion efficiency can be up to 96%.
Fig. 1 shows the Switching Power Supply of the high-quality two-step scheme of existing employing pfc circuit, including by 11 He of rectifier bridge
The unit 10 that pfc circuit 12 is connected and composed, as its purpose is still to obtain more smooth unidirectional current, while obtaining very high work(
Rate factor, is referred to as rectification circuit 10 the unit of 10 indications here, and is connected to the load 20 of 12 rear class of pfc circuit, load 20
It is a main power circuit 21, is LLC changers here.Electric capacity CAFor the input filter capacitor of pfc circuit 12, it act as absorbing
The high frequency ripple current of pfc circuit 12, while so that the operating current waveform of pfc circuit is closer to power frequency voltage waveform；Electric capacity
CBFor the output filter capacitor of pfc circuit 12, PFC output capacitances are commonly called as.
Domestic, office computer, if choice of main machine 80PLUS gold medal power supplys, then the LLC changers effect of main power circuit 21
After rate is very high, and rectification circuit 10 above is cascaded, in the U of 220VACACUnder input, 50% load is output as, efficiency high reaches
92%, power factor is more than 0.90.As display is independently-powered, its power supply is the common anti-of no PFC
Excitation type switch power-supply, power are less, typically in below 40W, survey 23 inch liquid crystal display normal work when power consumption in 16W extremely
Between 25W.Switching Power Supply to monitor power supply is also to be connected on input AC UACOn, the power of whole computer system can be caused
Factor drops to less than 0.80.
Certainly, the method for solution is easy to associate, and the rectification circuit in the Switching Power Supply to monitor power supply is deleted,
It is directly connected to electric capacity C in FIGBTwo ends, for convenience, Fig. 2 shows this application mode, wherein, to monitor power supply
Switching Power Supply is 22, referred to herein as auxiliary power circuit 22.
This modes of Fig. 2, are useful on computer or other electronic equipments and work, due to auxiliary power circuit 22 be also by
Pfc circuit 12 is powered, and has the advantage that, the output power of pfc circuit 12, then its PF value can be raised, and improves and is
The PF values of system.
Its weak point is：When computer shuts down, pfc circuit 12 quits work, meanwhile, the main power circuit 21 of following stage
Also quit work (this inherent function for being the integrated circuit that global each major company releases), but, due in pfc circuit 12, one
As all carry charging DB, in order to prevent charging current excessive, can also be in DBIn seal in NTC thermistor.This is because pfc circuit
When the system is first powered on, output capacitance C of PFCBTerminal voltage be zero, in order to prevent the power inductance in pfc circuit occur magnetic satisfy
With, and master power switch pipe has been burnt, D is setBWith the NTC thermistor of current limliting to electric capacity CBCharge, this is extremely popular at present
Method for designing；On the other hand, industrial equipment power supply needs the standby power of a 5V as computer power, and this is standard
Regulation, so, when computer power is turned off, electric capacity CBStill there is the DC voltage of 310V or so low power anti-will pass through one
Excitation type switch power-supply is powered to standby power, and upon power-up, electric capacity CBTerminal voltage rise to more than 380V.
This just brings a problem, and in Fig. 2 circuits, the power supply 22 of display is not as main power circuit 21 stops
Only work and stop, still at work, simply running voltage drops to 310V from 380V, but this is had no effect on by inverse-excitation type
The work of 22 power supplys of Switching Power Supply topology composition.I.e. auxiliary power circuit 22 is unable to synchro switch.
Auxiliary power circuit 22 synchronously can not be turned off, and its quiescent dissipation can not be ignored, and due to working always, decrease
The service life of auxiliary power circuit 22.
For this purpose, prior art is by setting up simultaneous switching circuit, to control auxiliary power circuit 22 and main power circuit 21
Shut-off keep synchronous, Fig. 3 shows this scheme, only increases a relay J1, when the output Vo1 of main power circuit 21 has
During normal output, the coil of relay J1 obtains electric and adhesive, and normally opened contact closure, auxiliary power circuit 22 obtain electric work.
As relay J1 is mechanical parts, its volume is larger, and the Miniaturization Design of whole machine is therefore very limited；Relay J1
Adhesive need the time, the response time of relay at least needs more than 10ms, makes the output response speed of Vo2 slower；And
The contact of relay is mechanical contact, often produces the phenomenon that contact arching (sparking) discharges in break-make moment, just because of
This, contact mostly is precious metal.
The solution of the use relay shown in Fig. 3, in the occasion sensitive to spark such as colliery, gas station, electrically in
Little sparklet also seriously threatened the safety of the person and equipment, and many precious metals to be consumed, also easily produce weight
Metallic pollution.
For the problems of relay-type synchro switch, it is brilliant that inventor proposed one kind on July 11st, 2014
The improvement project of the synchro switch that body pipe is realized, referring to Chinese Application No. 201410332233.1.Fig. 4 shows this application
The schematic diagram of embodiment one, for convenience, input filter capacitor CA, output capacitance CBIt is painted on above, the work of the simultaneous switching circuit
As principle it is：
When pfc circuit 12 does not work, output capacitance C of pfc circuit 12BTerminal voltage be 310V, even if civil power input
Voltage reaches upper limit 264VAC, output capacitance CBTerminal voltage be 2 times of its √ (radical sign 2), deduct the droop loss of rectification circuit, about
For 371V or so, output capacitance CBTerminal voltage for convenience, referred to as PFC output voltages.
At this moment, the comparison circuit being made up of resistance R1 and R2 and audion T1, stabilivolt VD0, resistance R3, is insufficient to allow
The base stage for obtaining audion T1 is turned on to emitter stage, audion T1 cut-offs, then, due to the presence of resistance R4, its colelctor electrode is exported
Low level, at this moment the grid of metal-oxide-semiconductor Q1 is zero volt to the voltage of source electrode, and metal-oxide-semiconductor Q1 cut-offs, auxiliary power circuit 22 cannot be obtained
PFC output voltages and do not work.
When 12 normal work of pfc circuit, PFC output voltages in more than 380V, by resistance R1 and R2 and audion T1,
The comparison circuit of stabilivolt VD0, resistance R3 composition, it is sufficient to so that the base stage of audion T1 is turned on to emitter stage, at audion T1
In magnifying state, its colelctor electrode exports high level, at this moment metal-oxide-semiconductor Q1 conductings, and auxiliary power circuit 22 directly obtains PFC output electricity
Press and normal work, almost start with main power circuit 21 simultaneously, set up output voltage.
Detailed operation principle may refer to the open file of Chinese Application No. 201410332233.1.
Existing main flow pfc circuit, no matter how high input ac voltage is, as long as in input range, such as 85VAC～
264VAC, its output are integrally fixed on a DC voltage, and this value is typically between 380V to 420V, true in design
It is fixed, once being fixed in certain value, would not change with the change of input voltage.
When the alternating voltage of input is relatively low, such as 110VAC, its peak value are 155.5V, then when boosting to 380V, at this moment, by
Excessive in dutycycle, the efficiency of the pfc circuit of BOOST is just than relatively low.In order to overcome this not enough, many internationally famous manufacturers are confused
More advanced pfc circuit is proposed confusingly, when input voltage is relatively low, such as input 110VAC, pfc circuit is only PFC output electricity
Pressure is raised to 250V, the even low voltage of 200V, and the dutycycle of the pfc circuit of such BOOST can be always worked at preferably
Numerical range.
It is obvious that the circuit of Chinese Application No. 201410332233.1 cannot to be operated in this more advanced PFC electric
On road (hereinafter referred to as intelligent pfc circuit).When the input voltage of intelligent pfc circuit is 110VAC, its PFC output voltage
For 250VDC, but Fig. 4 circuit audion T1 end, and metal-oxide-semiconductor Q1 cut-offs, auxiliary power circuit 22 cannot obtain PFC outputs
Voltage and do not work.
The deficiency of i.e. existing simultaneous switching circuit is summarized as follows：
(1) volume of relay is big；The response speed of relay-type synchro switch is slow, causes auxiliary power circuit 22
Output voltage Vo2 set up it is slower；
(2) there is arcing phenomenon in relay contact, and in colliery, gas station etc., the occasion sensitive to spark cannot be applied；
(3) power consumption of relay itself is not also low.Such as the relay of current more energy-conservation, running voltage 24V, internal resistance 1.2K
Ω, during adhesive, consumes energy for 0.48W, and many fields require that no-load power consumptions are less than 1W at present, realize this target using relay
Difficulty is very big；
(4) in theory, this problem can be solved using optocoupler, but requires the integrated electricity of master control of auxiliary power circuit 22
Road (IC) provides corresponding interface and supports, at present still without appearance；
(5) it is not suitable for the intelligent pfc circuit that PFC output voltages change with input ac voltage.
The content of the invention
In view of this, the invention solves the problems that deficiency existing for the simultaneous switching circuit of existing PFC, there is provided a kind of to adopt
The small volume of the compositions such as transistor device, fast response time, do not produce arcing, it is low in energy consumption, support without the need for master control IC, be applied to
The simultaneous switching circuit of the intelligent pfc circuit that PFC output voltages change with input ac voltage.
The object of the present invention is achieved like this, a kind of simultaneous switching circuit of PFC, including four terminals, is respectively：
Test side, input negative terminal, shared anode, output negative terminal, is characterized in that：The test side, for connect rectifier bridge output just
End；The shared anode, for connecting the output plus terminal of pfc circuit, while connecting the input positive terminal of auxiliary power circuit；It is described
Simultaneous switching circuit, also including first resistor, second resistance, 3rd resistor, the 4th resistance, electric capacity, PNP type triode and N ditches
Road metal-oxide-semiconductor, its annexation is：Test side is connected with the base stage of PNP type triode by first resistor, PNP type triode
Emitter stage is connected with shared anode, and second resistance and electric capacity are in parallel with emitter stage with PNP type triode base stage, three pole of positive-negative-positive
The colelctor electrode of pipe is connected with the grid of the 4th resistance and N-channel MOS pipe respectively by 3rd resistor, the other end of the 4th resistance with
The source electrode connection of N-channel MOS pipe, junction point are connected with input negative terminal simultaneously, and the drain electrode of N-channel MOS pipe is connected with output negative terminal.
Preferably, the simultaneous switching circuit of PFC, also including stabilivolt, the negative electrode of stabilivolt and the grid of N-channel MOS pipe
Pole connects, and the anode of stabilivolt is connected with the source electrode of N-channel MOS pipe.
Preferably, the simultaneous switching circuit of PFC, the emitter stage, collection also including a switch, switch and PNP type triode
Electrode is in parallel.
The simultaneous switching circuit of PFC of the present invention has the beneficial effect that：
(1) small volume；Response speed, response time are fast, the output voltage Vo2 setup times of auxiliary power circuit 22 and master
The output Vo1 of power circuit 21 is compared, and can be accomplished within 2mS；
(2) there is no mechanical contact, there is no arcing phenomenon in break-make moment, it is sensitive to spark in colliery, gas station etc.
Occasion normal use, meet high request of the high risk industries such as colliery to electrical safety；
(3) it is low in energy consumption, can easily as little as 40mW, i.e. 0.04W, meet the development trend of current energy-saving and emission-reduction, easily
Accomplish that Multi-path synchronous are switched；
(4) low, common Switching Power Supply can be required to follow-up auxiliary power circuit 22.
(5) the intelligent pfc circuit changed with input ac voltage suitable for PFC output voltages.
Description of the drawings
Fig. 1 is the Switching Power Supply of the high-quality two-step scheme of existing employing pfc circuit；
Fig. 2 is that the existing rectification circuit accessory power supply is deleted, the direct and application circuit in PFC output capacitances；
Fig. 3 is the simultaneous switching circuit that existing employing relay realizes accessory power supply and main power circuit；
Fig. 4 is application circuit of the simultaneous switching circuit of inventor's patent applied in Switching Power Supply；
Fig. 5 is application circuit of the simultaneous switching circuit of first embodiment of the invention etc. in Switching Power Supply；
Schematic diagrams of the Fig. 6 for the simultaneous switching circuit of first embodiment of the invention；
Schematic diagrams of the Fig. 7 for the simultaneous switching circuit of second embodiment of the invention；
Schematic diagrams of the Fig. 8 for the simultaneous switching circuit of third embodiment of the invention.
Specific embodiment
First embodiment
Refer to application of the simultaneous switching circuit of Fig. 5 and Fig. 6, Fig. 5 for first embodiment of the invention in Switching Power Supply
Circuit diagram, Fig. 6 are the schematic diagram of the simultaneous switching circuit of first embodiment of the invention, so facilitate the understanding of the present invention；Fig. 5
The circuit of 30 indication of middle dashed box, with the circuit shown in Fig. 6, is a kind of simultaneous switching circuit of PFC, including test side Vi+, defeated
Enter negative terminal Vi-, share anode Vo+, export this four terminals of negative terminal Vo-, resistance R1, R2, R3, R4, electric capacity C1, three pole of positive-negative-positive
Pipe T1 and N-channel MOS pipe Q1, its annexation is：Test side Vi+ is by first resistor R1 and the base stage of PNP type triode T1
Connection, the emitter stage of PNP type triode T1 is connected with shared anode Vo+, and second resistance R2 and electric capacity C1 are and PNP type triode
The base stage of T1 is in parallel with emitter stage, the colelctor electrode of PNP type triode T1 by 3rd resistor R3 respectively with the 4th resistance R4 and N ditch
The grid connection of road metal-oxide-semiconductor Q1, the other end of the 4th resistance R4 is connected with the source electrode of N-channel MOS pipe Q1, junction point at the same with it is defeated
Enter negative terminal Vi- connections, the drain electrode of N-channel MOS pipe Q1 is connected with output negative terminal Vo-.
Referring to Fig. 5, application process of the simultaneous switching circuit in Switching Power Supply is：Test side Vi+ connects rectification circuit 10
The output of middle rectifier bridge 11 just (outfan of figure acceptance of the bid "+"), i.e. the input filter capacitor C of pfc circuit 12APositive pole (A)；It is defeated
Enter negative terminal Vi- and be connected to PFC output capacitances CBThe negative pole outfan of "-" (Fig. 5 units 12 get the bid)；Shared anode Vo+ connections
To the positive pole (B) of PFC output capacitances, and Fig. 5 units 12 are got the bid the outfan of "+", while being connected to auxiliary power circuit 22
Input just (in Fig. 5 unit 22 get the bid "+" input)；Output negative terminal Vo- is connected to the input of auxiliary power circuit 22 and bears
(input of the acceptance of the bid of unit 22 "-" in Fig. 5).
The operation principle of the synchro switch of the PFC is：
When pfc circuit 12 does not work, this moment, main power circuit 21 is also synchronous does not work, and this is that global each major company pushes away
The inherent function of the integrated circuit for going out.In due to pfc circuit 12, charging diode D is typically all carriedBNo matter, the exchange of input
Voltage UACIt is how many, in Fig. 5, due to there is electric capacity CA, very gently, i.e., discharge current is minimum, the voltage and B points one of A points for its load
Sample (B point voltages can be lower slightly), is all more smooth unidirectional current, is 2 times of the √ of input AC piezoelectric voltage virtual value, i.e. A, B point
Between voltage difference very little, A point voltages are slightly higher, are higher by a DBPressure drop.The value of resistance R1 is very big, and the value of R2 is less,
That is pressure reduction (hereinafter referred to as A, B of the upper end (share anode Vo+, with B points) of the lower end of resistance R1 (A points) voltage to resistance R2
Point pressure reduction) very little, less than 0.5V, at this moment, PNP type triode T1 is in cut-off state to the terminal voltage of resistance R2, then, its current collection
Pole is received resistance R3, R4 drop-down and exports low level, and N-channel MOS pipe Q1 is also at cut-off state, then auxiliary power circuit 22
Input is negative in open-circuit condition, and auxiliary power circuit 22 does not work, and realizes and main power circuit 21 is synchronous, without output voltage.
When pfc circuit 12 works, main power circuit 21 also works asynchronously, this moment, no matter the alternating voltage U of inputACIt is
How much, in Fig. 5, the voltage peak of A points is 2 times of the √ of input AC electricity virtual value, and is Rectified alternating current；And B points must be
The crest voltage of pressure, i.e. B point voltages higher than A points, input 110VAC as described in the background art, pfc circuit handle are risen
PFC output voltages are raised to 200V, then B point voltages are 200V, and the crest voltage of A points is 110V × 1.414=155.5V, is subtracted
Remove the droop loss of rectification, then, A point voltages peak value is 152V or so, and direct current virtual value is still 110V, and A, B point pressure reduction is most
For 200V-152V=48V, meansigma methodss reach 200V-110V=90V to little value, then, the terminal voltage of resistance R2 is sufficient for audion T1
In magnifying state, as the value of resistance R3 is larger, its colelctor electrode exports high level, and at this moment the grid of metal-oxide-semiconductor Q1 is to source electrode
Voltage for resistance R4 partial pressure, for safety, this voltage bears voltage no more than the largest gate of metal-oxide-semiconductor Q1, source electrode,
Typically in below 20V；Require that the grid more than metal-oxide-semiconductor Q1, source electrode open threshold voltage V simultaneouslyGS, at this moment metal-oxide-semiconductor Q1 conductings, its
Internal resistance is very low, i.e. Rds(ON)Very low, auxiliary power circuit 22 directly obtains PFC output voltages and normal work, almost and main power source
Circuit 21 starts simultaneously, sets up output voltage.
If not adopting intelligent pfc circuit, input 110VAC is upgraded to 380V, A, B point pressure reduction is up to 270V, and circuit is same
Normal work, and when pfc circuit 12 does not work, A, B point pressure reduction still very little, N-channel MOS pipe Q1 are also at cut-off state.
The effect of electric capacity C1：As this circuit is used in Switching Power Supply, interference is big, in order to avoid strong jamming causes audion
There is small current detecting action and false triggering in T1, PNP type triode T1 emitter stage between base stage, a high frequency also in parallel
The little low capacity electric capacity C1 of loss, general COG (NPO) electric capacity from patch capacitor, low capacity electric capacity in the industry cycle one
As refer to the electric capacity of below 1000pF, i.e., including 1000pF, in actual debugging, 33pF to 100pF effects are just fine, with two
Above electric capacity to be unified into an electric capacity be common knowledge, it is possible to obtain broader operating frequency.In embodiment one, elegance and talent has been used
The 1000pF electric capacity of the JOHANSON brands of high-tech production, surveys in the radiation field intensity of 20V/m, the frequency of radiation field from
150KHz to 1GHz, the present invention can be with normal work.Contrast model machine without adding this electric capacity, radiation field intensity to 3V/m
When, many frequency ranges can not all work, such as in 1MHz, 4MHz.
On the other hand, when 12 normal work of pfc circuit, A point voltages are Rectified alternating current, and electric capacity C1 has certain filtering
Effect, the work of stable PNP type triode T1.
Operation principle simplifies explanation：Detection electricity is constituted by PNP type triode T1 and peripheral resistance R1, R2, electric capacity C1
Road, the lower end of resistance R1 connect the pfc circuit front end of BOOST, the i.e. input filter of the output of rectifier bridge 11, pfc circuit before PFC
Electric capacity CAOn, and the emitter stage of audion T1 is connected on the output high pressure of PFC, when being worked using the pfc circuit 12 of BOOST
The voltage difference that boosting is produced, allows audion T1 to turn on, and drives N-channel MOS pipe Q1 by resistance R3, and metal-oxide-semiconductor Q1 conductings are real
Existing function；And when the pfc circuit 12 of BOOST does not work, two point voltage difference of A, B is little, audion T1 cut-offs turn off metal-oxide-semiconductor Q1
And realize shut-off.
That is, the embodiment of the present invention one is applied to the intelligent pfc circuit that PFC output voltages change with input ac voltage.
Synchro switch of the present invention 30, for the synchro switch of relay, is realized due to using transistor circuit
Switch synchronizing function, greatly reduces the volume of simultaneous switching circuit.In addition the response time of audion T1 and metal-oxide-semiconductor Q1 about exists
1uS or so, input junction capacity C of the time delay of circuit essentially from metal-oxide-semiconductor Q1iss, i.e., in the high electricity of colelctor electrode output of audion T1
At ordinary times, input junction capacity C by resistance R3 to metal-oxide-semiconductor Q1issCharging causes, input junction capacity C of metal-oxide-semiconductor Q1issTypically exist
Hundreds of pF between thousand of pF, by selecting resistance R3, R4 well, completely can this delay time according to actual needs from
Row is adjusted, from 1mS to 1S, or even it is longer can realize, certainly this needs between the grid and source electrode of metal-oxide-semiconductor Q1 it is appropriate simultaneously
Electric capacity, to increase delay time.
As electronic circuit does not have mechanical contact, so as to eliminate the sparking of contact in the relay of existing synchro switch
Factor, thus be entirely capable of meeting high request of the high risk industries such as colliery to electrical safety.Again due to the composition device of synchro switch
Quantity is few, and structure design is simple, it is easy to circuit debugging, it is easier to the realization of production.
It is electric that the circuit of the Chinese Application No. 201410332233.1 mentioned in background technology cannot be operated in intelligent PFC
Lu Shang, and first embodiment of the invention is applied to the intelligent pfc circuit that PFC output voltages change with input ac voltage, this
It is significant progress.
One group of experimental data given below illustrates the effect of first embodiment, and resistance R1 is 0805 paster of three 10M Ω
Resistant series, obtain the resistance of 30M Ω, simultaneously obtain higher pressure using resistant series, and this is known technology, is still equal to
Former resistance；0805 Chip-Rs of the resistance R2 for 3.3M Ω, resistance R3 are the 0805 Chip-R series connection of two 10M Ω, are obtained
The resistance of 20M Ω or so, while obtaining higher pressure；0805 Chip-Rs of the resistance R4 for 820K Ω；Electric capacity C1 is
The COG electric capacity of 1000pF, it is pressure for 50V；Audion T1 be FMMT558, metal-oxide-semiconductor Q1 models 4N60；
After circuit is welded, under input 220VAC, when pfc circuit 12 does not work, the output voltage of PFC is actual measurement circuit
309V, the simultaneous switching circuit static working current of the present invention is 0uA, and quiescent dissipation is 0mW；When PFC normal works, PFC
Output voltage be 386V, the present invention simultaneous switching circuit static working current be 23.9uA, quiescent dissipation is 9.3mW, drive
The voltage of dynamic metal-oxide-semiconductor Q1 is 15.2V.The equal normal work of Switching Power Supply of below continued access 75W afterwards, it should be noted that follow-up
Auxiliary power circuit 22, needs to remove rectification circuit, and the electrochemical capacitor of filtering only retains the little electricity of high pressure for filtering high frequency ripple
Hold, general capacity is less than 0.47uF.
When AC-input voltage is adjusted to 85VAC, the output voltage of pfc circuit 12 drops to 254V, the electricity of the present invention
Road still can normal work, drive metal-oxide-semiconductor Q1 voltage be 10.0V, still can well drive metal-oxide-semiconductor Q1.And mention in background technology
The circuit of Chinese Application No. 201410332233.1 can not work, i.e., no matter whether pfc circuit 12 works, accessory power supply
Circuit 22 does not work.
It will be apparent that in first embodiment, there is no the devices such as electrochemical capacitor, inductance, its volume can be made very small, and hold very much
Easy being integrated.
Second embodiment
Fig. 7 shows the synchro switch schematic diagram of the PFC of second embodiment, a kind of simultaneous switching circuit of PFC, with
The difference of first embodiment is, also including stabilivolt VD1, grid, the source of the stabilivolt VD1 and N-channel MOS pipe Q1
Extremely in parallel, i.e., the negative electrode of stabilivolt VD1 is connected with the grid of metal-oxide-semiconductor Q1, and the anode of stabilivolt VD1 is connected with the source electrode of metal-oxide-semiconductor Q1
Connect.With limit metal-oxide-semiconductor Q1 gate drive voltage less than stabilivolt VD1 voltage stabilizing value, so as to protect metal-oxide-semiconductor Q1 grid,
Source electrode is not breakdown, has further ensured stability and reliability that synchro switch works under high pressure occasion.Fig. 7 circuits are replaced
30 part of dashed box in Fig. 5 is changed, by following connections：
The output of rectifier bridge 11 just (outfan of figure acceptance of the bid "+") in test side Vi+ connection rectification circuits 10, i.e. PFC is electric
The positive pole (A) of the input filter capacitor on road 12；Input negative terminal Vi- is connected to the negative pole of PFC output capacitances, and (Fig. 5 units 12 are got the bid
The outfan of "-")；Shared anode Vo+ is connected to the positive pole (B) of PFC output capacitances, and the output of the acceptance of the bid "+" of Fig. 5 units 12
End, while being connected to the input just (input of the acceptance of the bid of unit 22 "+" in Fig. 5) of auxiliary power circuit 22；Output negative terminal Vo- connects
It is connected to the input negative (input of the acceptance of the bid of unit 22 "-" in Fig. 5) of auxiliary power circuit 22.
When certainly, using stabilivolt VD1, resistance R4 can be dispensed with, i.e. resistance R4 can be substituted with stabilivolt VD1.
The same first embodiment of operation principle, is repeated no more here.
One group of experimental data given below illustrates the effect of first embodiment, and resistance R1 is 0805 paster of three 6.8M Ω
Resistant series, obtain the resistance of 20.4M Ω；0805 Chip-Rs of the resistance R2 for 2.2M Ω, resistance R3 is two 6.8M Ω
0805 Chip-R is connected, and obtains the resistance of 13.6M Ω or so；0805 Chip-Rs of the resistance R4 for 6.8M Ω；Electric capacity C1 is
The COG electric capacity of 330pF, it is pressure for 25V；Audion T1 be STN93003, metal-oxide-semiconductor Q1 models IPA60R190C6；Stabilivolt
VD1 voltage stabilizings value is typically selected between 7.5V to 20V, has selected the stabilivolt of 15V/0.5W here.
After circuit is welded, under input 220VAC, when pfc circuit 12 does not work, the output voltage of PFC is actual measurement circuit
309V, the simultaneous switching circuit static working current of the present invention is 0uA, and quiescent dissipation is 0mW；When PFC normal works, PFC
Output voltage be 411V, the present invention simultaneous switching circuit static working current be 39.6uA, quiescent dissipation is 16.2mW, drive
The voltage of dynamic metal-oxide-semiconductor Q1 is 15.1V, if removing stabilivolt VD1, the voltage for driving metal-oxide-semiconductor Q1 is 136.8V, it is sufficient to puncture MOS
The grid of pipe Q1, source electrode.The equal normal work of Switching Power Supply of below continued access 350W, has selected the LLC topologys of 240W respectively afterwards
Switching Power Supply, the double tube positive exciting Switching Power Supply of 350W, the flyback sourse of 120W need note as follow-up auxiliary power circuit 22
Meaning, above-mentioned various topologys are required for removing rectification circuit, and the electrochemical capacitor of filtering only retains and filters high frequency ripple
High pressure small capacitances, are used herein the CBB electric capacity of 0.47uF/630V.
Quiescent dissipation is 16.2mW, even if ten road in parallel auxiliary power circuit, its quiescent dissipation ability 162mW is realized low
Power consumption.
When AC-input voltage is adjusted to 85VAC, the output voltage of pfc circuit 12 drops to 254V, the electricity of the present invention
Road still can normal work, drive metal-oxide-semiconductor Q1 voltage still be 15.1V, be stably driven with metal-oxide-semiconductor Q1.And mention in background technology
The circuit of Chinese Application No. 201410332233.1 can not work, i.e., no matter whether pfc circuit 12 works, accessory power supply
Circuit 22 does not work.
In fact, in this example, removing stabilivolt VD1, resistance R4 is changed to 0805 Chip-R of 560K Ω, same to realize in fact
The function of example one is applied, simply load capacity rises to more than 350W.It will be apparent that in second embodiment, there is no electrochemical capacitor, electricity
The devices such as sense, its volume can be made very small, it is easy to being integrated.
In actual use, when also wanting to sometimes individually open auxiliary power circuit 22, such as individually display is allowed to be powered,
So as to external notebook computer, this function at this moment can be realized with 3rd embodiment.
3rd embodiment
Fig. 8 shows the simultaneous switching circuit schematic diagram of the PFC of 3rd embodiment, different from first and second embodiment
Part is that also including a switch K, K is in parallel with the emitter stage of audion T1, colelctor electrode for switch, that is, switch one end and audion
The emitter stage connection of T1, the other end of switch are connected with the colelctor electrode of audion T1.Fig. 8 circuits are replaced dashed box 30 in Fig. 5
Point, by following connections：
The output of rectifier bridge 11 just (outfan of figure acceptance of the bid "+") in test side Vi+ connection rectification circuits 10, i.e. PFC is electric
The positive pole (A) of the input filter capacitor on road 12；Input negative terminal Vi- is connected to the negative pole of PFC output capacitances, and (Fig. 5 units 12 are got the bid
The outfan of "-")；Shared anode Vo+ is connected to the positive pole (B) of PFC output capacitances, and the output of the acceptance of the bid "+" of Fig. 5 units 12
End, while being connected to the input just (input of the acceptance of the bid of unit 22 "+" in Fig. 5) of auxiliary power circuit 22；Output negative terminal Vo- connects
It is connected to the input negative (input of the acceptance of the bid of unit 22 "-" in Fig. 5) of auxiliary power circuit 22.
When pfc circuit 12 does not work, when thinking individually to open auxiliary power circuit 22, closure switch K.Auxiliary
When power circuit 22 is the equipment such as multimedia loudspeaker box, display, LED illumination lamp, this function is particularly useful.
It will be apparent that the switch K is added in embodiment two, goal of the invention is equally realized.It will be apparent that 3rd embodiment
In, there is no the devices such as electrochemical capacitor, inductance, its volume can be made very small, it is easy to being integrated.
The above 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, such as common mode inductance, differential mode inductance, or NTC thermistor is sealed in the loop, these improvement
Also protection scope of the present invention being should be regarded as with retouching, no longer being repeated with embodiment here, protection scope of the present invention should be with power
Profit requires that limited range is defined.
Claims (3)
1. a kind of simultaneous switching circuit of PFC, including four terminals, be respectively：Test side, input negative terminal, share anode, defeated
Go out negative terminal, it is characterized in that：The test side, for connecting the output plus terminal of rectifier bridge；The shared anode, for connecting PFC
The output plus terminal of circuit, while connecting the input positive terminal of auxiliary power circuit；
The simultaneous switching circuit, also including first resistor, second resistance, 3rd resistor, the 4th resistance, electric capacity, three pole of positive-negative-positive
Manage and N-channel MOS pipe, its annexation is：Base stage of the test side by the first resistor and the PNP type triode
Connection, the emitter stage of the PNP type triode is connected with the shared anode, the second resistance and the electric capacity with it is described
PNP type triode base stage is in parallel with emitter stage, the colelctor electrode of the PNP type triode by the 3rd resistor respectively with it is described
The grid connection of the 4th resistance and the N-channel MOS pipe, the other end of the 4th resistance and the source electrode of the N-channel MOS pipe
Connection, junction point are connected with the input negative terminal simultaneously, and the drain electrode of the N-channel MOS pipe is connected with the output negative terminal.
2. the simultaneous switching circuit of PFC according to claim 1, is characterized in that：Also include stabilivolt, the stabilivolt
Negative electrode be connected with the grid of the N-channel MOS pipe, the anode of the stabilivolt is connected with the source electrode of the N-channel MOS pipe.
3. the simultaneous switching circuit of PFC according to claim 1 and 2, is characterized in that：It is also including a switch, described to open
Close in parallel with the emitter stage of the PNP type triode, colelctor electrode.
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| CN201410369643.3A CN104135147B (en) | 2014-07-30 | 2014-07-30 | A kind of simultaneous switching circuit of PFC |
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| CN105207479B (en) * | 2015-10-26 | 2017-08-25 | 广州金升阳科技有限公司 | A kind of controllable booster circuit |
| CN105551885B (en) * | 2015-12-31 | 2017-12-29 | 广州金升阳科技有限公司 | The power save circuit of contactor |
| CN117177402B (en) * | 2023-11-03 | 2024-03-26 | 广东东菱电源科技有限公司 | Three-way output power VCC power supply circuit |
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| CN101807848A (en) * | 2010-03-31 | 2010-08-18 | 苏州佳世达光电有限公司 | Power switch circuit |
| CN102155342B (en) * | 2011-03-04 | 2012-12-12 | 广州金升阳科技有限公司 | Power supply circuit for automobile |
| CN102386756A (en) * | 2011-11-20 | 2012-03-21 | 任永斌 | Power frequency switching power supply |
| CN202475621U (en) * | 2011-12-31 | 2012-10-03 | 青岛海信电器股份有限公司 | Led liquid crystal television |
| US9024539B2 (en) * | 2012-09-27 | 2015-05-05 | Immense Advance Technology Corp. | PFC LED driver capable of reducing flicker |
| CN203313079U (en) * | 2013-04-25 | 2013-11-27 | 苏州工业园区华波电子科技有限公司 | Synchronous rectification circuit |
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