CN104135147A - Synchronous switch circuit for PFC - Google Patents
Synchronous switch circuit for PFC Download PDFInfo
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- CN104135147A CN104135147A CN201410369643.3A CN201410369643A CN104135147A CN 104135147 A CN104135147 A CN 104135147A CN 201410369643 A CN201410369643 A CN 201410369643A CN 104135147 A CN104135147 A CN 104135147A
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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
The invention discloses a synchronous switch circuit for PFC. A detection circuit is composed of a PNP type triode T1, a peripheral resistor R1, a peripheral resistor R2 and a capacitor C1. The lower end of the resistor R1 is connected with the front end of a PFC circuit of BOOST, namely the PFC front rectifier bridge output and PFC circuit input filter capacitor, the emitting electrode of the triode T1 is connected to the high output voltage of PFC circuit, the voltage difference generated by the boosting effect formed when the PFC circuit of the BOOST works is utilized for switching on the triode T1, N-channel MOS transistor Q1 is driven by a resistor R3, and the MOS transistor Q1 is switched on. Compared with the prior art, due to the fact that the switch synchronizing function of the synchronous switch circuit for PFC is achieved by the adoption of the triode circuit, the size of the synchronous switch is reduced, the response speed is high, arcing factors of contacts in a relay in an existing synchronous switch are completely eliminated, and therefore the high requirement of high-risk industries such as coal mines for electric safety is completely met; the synchronous switch is particularly applicable to an intelligent PFC circuit with the PFC output voltage changing along with the changes of input alternating current voltage, and controls various auxiliary switch power supplies.
Description
Technical field
The present invention relates to the Switching Power Supply with PFC, particularly rear class exists in the system of multi-channel converter parallel connection, the simultaneous switching circuit that bypass is used.
Background technology
Along with the further requirement of the power factor of national standard to electrical appliance, the Switching Power Supply of Alternating Current Power Supply more than consumed power 75W is had to power factor (PF) requirement, require the operating current waveform fundamental sum voltage waveform of circuit identical.
Now existing circuit of power factor correction addresses this problem, and circuit of power factor correction, referred to as pfc circuit, is the abbreviation of Power Factor Correction.
Note: 75W, data from CNS GB17625.1-1998, is called " Harmonic Current Limits (the every phase input current≤16A of equipment) that low-voltage electrical and electronic equipment send ".
Traditional BOOST power factor corrector has solved this problem well, and its operation principle can be referring to the 190th page, 191 pages of " principle of Switching Power Supply and the designs " of Electronic Industry Press, this book ISBN 7-121-00211-6.
Use PFC (the Power Factor Correction) circuit of BOOST to add LLC converter (LLC resonant converter), can allow power factor 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, comprise the unit 10 being connected and composed by rectifier bridge 11 and pfc circuit 12, because its object is still the comparatively level and smooth direct current of acquisition, obtain very high power factor simultaneously, here the unit of 10 indications is called to rectification circuit 10, and being connected in the load 20 of pfc circuit 12 rear classes, load 20 is main power circuits 21, is LLC converter here.Capacitor C
afor the input filter capacitor of pfc circuit 12, act as the high frequency ripple electric current that absorbs pfc circuit 12, make the operating current waveform of pfc circuit more approach power frequency voltage waveform simultaneously; Capacitor C
bfor the output filter capacitor of pfc circuit 12, be commonly called as PFC output capacitance.
Family expenses, office computer, if choice of main machine 80PLUS gold medal power supply, the LLC transducer effciency of main power circuit 21 is very high so, and after rectification circuit 10 cascades above, at the U of 220VAC
aCunder input, be output as 50% load, efficiency is up to 92%, and power factor is more than 0.90.Because display is independently-powered, its power supply is the common inverse-excitation type switch power-supply that there is no power factor correction, and power is less, and generally, below 40W, when the liquid crystal display of actual measurement 23 inch is normally worked, power consumption is between 16W to 25W.Giving the Switching Power Supply of monitor power supply is to be also connected on input AC U
aCon, can make the power factor of whole computer system drop to below 0.80.
Certainly, the method for solution is easy to associate, and deleting to the rectification circuit in the Switching Power Supply of monitor power supply, is directly connected to capacitor C in Fig. 1
btwo ends, for convenient, Fig. 2 shows this application mode, and wherein, giving the Switching Power Supply of monitor power supply is 22, referred to herein as auxiliary power circuit 22.
This mode of Fig. 2, is useful on computer or other electronic equipment and works, and because auxiliary power circuit 22 is also to be powered by pfc circuit 12, the benefit of bringing is, the power output of pfc circuit 12 is large, and its PF value can raise so, has improved the PF value of system.
Its weak point is: in the time of shut down of computer, pfc circuit 12 quits work, simultaneously, the main power circuit 21 of its rear class also quit work (inherent function that this is the integrated circuit released of global each major company), but, in pfc circuit 12, generally all with charging D
b, excessive in order to prevent charging current, also can be at D
bin seal in NTC thermistor.This is because of pfc circuit when the system is first powered on, the output capacitance C of PFC
bterminal voltage be zero, in order to prevent that magnetic saturation from appearring in the power inductance in pfc circuit, and burnt master power switch pipe, D is set
bthe NTC thermistor of using with current limliting is to capacitor C
bcharging, this is current very popular method for designing; On the other hand, industrial equipment power supply is the same with computer power, needs the standby power of a 5V, and this is standard regulation, so, in the time turn-offing computer power, capacitor C
bstill have the direct voltage of 310V left and right to power to standby power by a low power inverse-excitation type switch power-supply, and in the time of start, capacitor C
bterminal voltage rise to 380V more than.
This just brings a problem, in Fig. 2 circuit, the power supply 22 of display is along with main power circuit 21 quits work and stops, still at work, just operating voltage drops to 310V from 380V, but this does not affect the work of 22 power supplys that are made up of inverse-excitation type switch power-supply topology.Be that auxiliary power circuit 22 can not synchro switch.
Auxiliary power circuit 22 can not synchronously turn-off, and its quiescent dissipation can not be ignored, and owing to will work always, has also reduced the useful life of auxiliary power circuit 22.
For this reason, prior art is by setting up simultaneous switching circuit, keep synchronizeing with the shutoff of main power circuit 21 to control auxiliary power circuit 22, Fig. 3 shows this scheme, only increase a relay J 1, in the time that the output Vo1 of main power circuit 21 has normal output, the coil of relay J 1 obtains electric and adhesive, normally opened contact closure, auxiliary power circuit 22 obtains electric work.
Because relay J 1 is mechanical parts, its volume is larger, and the Miniaturization Design of complete machine is therefore very limited; The adhesive of relay J 1 needs the time, and the response time of relay makes the output response speed of Vo2 slower more than at least needing 10ms; And the contact of relay is mechanical contact, tend to produce the phenomenon of contact arching (sparking) electric discharge in break-make moment, just because of this, contact mostly is precious metal.
The solution of the use relay shown in Fig. 3, the occasion in colliery, gas station etc. to spark sensitivity, the little sparklet in electric is the safety to the person and equipment by serious threat also, and will consume a lot of precious metals, also easily produces heavy metal pollution.
For the existing problem of relay-type synchro switch, inventor has proposed a kind of improvement project of the synchro switch of realizing with transistor on July 11st, 2014, be 201410332233.1 referring to Chinese application number.Fig. 4 shows the schematic diagram of the embodiment mono-of this application, for convenient, and input filter capacitor C
a, output capacitance C
babove being painted on, the operation principle of this simultaneous switching circuit is:
In the time that pfc circuit 12 is not worked, the output capacitance C of pfc circuit 12
bterminal voltage be 310V, even if mains input voltage reaches upper limit 264VAC, output capacitance C
bterminal voltage be 2 times of its √ (radical sign 2), deduct the droop loss of rectification circuit, be about about 371V, output capacitance C
bterminal voltage for convenient, be called PFC output voltage.
At this moment, the comparison circuit being formed by resistance R 1 and R2 and triode T1, voltage-stabiliser tube VD0, resistance R 3, be not enough to make the base stage of triode T1 to emitter conducting, triode T1 cut-off, so, due to the existence of resistance R 4, its collector electrode output low level, at this moment the grid of metal-oxide-semiconductor Q1 is zero volt to the voltage of source electrode, metal-oxide-semiconductor Q1 cut-off, and auxiliary power circuit 22 cannot obtain PFC output voltage and not work.
In the time of pfc circuit 12 normal work, PFC output voltage is more than 380V, the comparison circuit being formed by resistance R 1 and R2 and triode T1, voltage-stabiliser tube VD0, resistance R 3, be enough to make the base stage of triode T1 to emitter conducting, triode T1 is in magnifying state, and its collector electrode is exported high level, at this moment metal-oxide-semiconductor Q1 conducting, auxiliary power circuit 22 directly obtains PFC output voltage and normally works, and almost starts with main power circuit 21 simultaneously, sets up output voltage.
The open file that detailed operation principle can be 201410332233.1 referring to Chinese application number.
Existing main flow pfc circuit, no matter how high input ac voltage is, as long as in input range, as 85VAC～264VAC, its output is to be all fixed on a direct voltage, and this value generally, between 380V to 420V, is determined in the time of design, once it is upper to be fixed on certain value, just can not change with the variation of input voltage.
When the alternating voltage of input is when lower, as 110VAC, its peak value is 155.5V, then while boosting to 380V, at this moment, because duty ratio is excessive, the efficiency of the pfc circuit of BOOST is just lower.In order to overcome this deficiency, a lot of internationally famous manufacturers have released more advanced pfc circuit one after another, in the time that input voltage is lower, as input 110VAC, pfc circuit is only raised to 250V PFC output voltage, or even the low voltage of 200V, the duty ratio of the pfc circuit of BOOST can be operated in good number range always like this.
Clearly, the circuit that Chinese application number is 201410332233.1 cannot be operated in (hereinafter referred to as intelligent pfc circuit) on this more advanced pfc circuit.In the time that the input voltage of intelligent pfc circuit is 110VAC, its PFC output voltage is 250VDC, but Fig. 4 circuit triode T1 ends, metal-oxide-semiconductor Q1 cut-off, and auxiliary power circuit 22 cannot obtain PFC output voltage and not work.
The deficiency that is existing simultaneous switching circuit is summarized as follows:
(1) volume of relay is large; The response speed of relay-type synchro switch is slow, causes the output voltage V o2 foundation of auxiliary power circuit 22 slower;
(2) there is arcing phenomenon in relay contact, cannot apply the occasion of spark sensitivity in colliery, gas station etc.;
(3) power consumption of relay itself is not low yet.As current comparatively energy-conservation relay, operating voltage 24V, internal resistance 1.2K Ω, when adhesive, consumes energy for 0.48W, and at present a lot of fields require no-load power consumptions to be less than 1W, and the difficulty that uses relay to realize this goal is very large;
(4) in theory, use optocoupler to address this problem, but require the main control integrated circuit (IC) of auxiliary power circuit 22 that corresponding interface support is provided, still do not occur at present;
(5) be not suitable for the intelligent pfc circuit that PFC output voltage changes with input ac voltage.
Summary of the invention
In view of this, the present invention will solve the existing deficiency of simultaneous switching circuit that existing PFC uses, and provides a kind of and adopts the volume of the formations such as transistor device little, fast response time, do not produce arcing, simultaneous switching circuit low in energy consumption, that support without master control IC, that be applicable to the intelligent pfc circuit that PFC output voltage changes with input ac voltage.
The object of the present invention is achieved like this, the simultaneous switching circuit that a kind of PFC uses, comprise four terminals, respectively: test side, input negative terminal, share anode, output negative terminal, it is characterized in that: also comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, electric capacity, positive-negative-positive triode and N-channel MOS pipe, its annexation is: test side is connected with the base stage of positive-negative-positive triode by the first resistance, the emitter of positive-negative-positive triode is connected with shared anode, the second resistance and electric capacity are all in parallel with emitter with positive-negative-positive transistor base, the collector electrode of positive-negative-positive triode is connected with the grid of the 4th resistance and N-channel MOS pipe respectively by the 3rd resistance, the other end of the 4th resistance is connected with the source electrode of N-channel MOS pipe, tie point is connected with input negative terminal simultaneously, the drain electrode of N-channel MOS pipe is connected with output negative terminal.
Preferably, the simultaneous switching circuit that PFC uses, also comprises voltage-stabiliser tube, and the negative electrode of voltage-stabiliser tube is connected with the grid of N-channel MOS pipe, and the anode of voltage-stabiliser tube is connected with the source electrode of N-channel MOS pipe.
Preferably, the simultaneous switching circuit that PFC uses, also comprises a switch, and switch is in parallel with emitter, the collector electrode of positive-negative-positive triode.
The beneficial effect of the simultaneous switching circuit that PFC of the present invention uses is:
(1) volume is little; Response speed, response time are fast, compared with the output Vo1 of main power circuit 21, can accomplish in 2mS output voltage V o2 settling time of auxiliary power circuit 22;
(2) do not have mechanical contact, do not have arcing phenomenon in break-make moment, the occasion normal use in colliery, gas station etc. to spark sensitivity, meets the high request of the high risk industries such as colliery to electrical safety;
(3) low in energy consumption, can easily be low to moderate 40mW, i.e. 0.04W, meets the development trend of current energy-saving and emission-reduction, easily accomplishes Multi-path synchronous switch;
(4) require low, the common Switching Power Supply can to follow-up auxiliary power circuit 22.
(5) be applicable to the intelligent pfc circuit that PFC output voltage changes with input ac voltage.
Brief 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 existing the deletion of the rectification circuit of accessory power supply, the application circuit directly and in PFC output capacitance;
Fig. 3 is the simultaneous switching circuit that existing employing relay is realized accessory power supply and main power circuit;
Fig. 4 is the simultaneous switching circuit of the inventor's patent applied for application circuit in Switching Power Supply;
Fig. 5 is the application circuit in Switching Power Supply such as the simultaneous switching circuit of first embodiment of the invention etc.;
Fig. 6 is the schematic diagram of the simultaneous switching circuit of first embodiment of the invention;
Fig. 7 is the schematic diagram of the simultaneous switching circuit of second embodiment of the invention;
Fig. 8 is the schematic diagram of the simultaneous switching circuit of third embodiment of the invention.
Embodiment
The first embodiment
Refer to Fig. 5 and Fig. 6, the application circuit of the simultaneous switching circuit that Fig. 5 is first embodiment of the invention in Switching Power Supply, the schematic diagram of the simultaneous switching circuit that Fig. 6 is first embodiment of the invention, facilitates the understanding of the present invention like this, in Fig. 5, the circuit of empty frame 30 indications is with the circuit shown in Fig. 6, the simultaneous switching circuit of using for a kind of PFC, comprise test side Vi+, input negative terminal Vi-, share anode Vo+, these four terminals of output negative terminal Vo-, resistance R 1, R2, R3, R4, capacitor C 1, positive-negative-positive triode T1 and N-channel MOS pipe Q1, its annexation is: test side Vi+ is connected with the base stage of positive-negative-positive triode T1 by the first resistance R 1, the emitter of positive-negative-positive triode T1 is connected with shared anode Vo+, the second resistance R 2 and capacitor C 1 are all in parallel with emitter with the base stage of positive-negative-positive triode T1, the collector electrode of positive-negative-positive triode T1 is connected with the grid of the 4th resistance R 4 and N-channel MOS pipe Q1 respectively by the 3rd resistance R 3, the other end of the 4th resistance R 4 is connected with the source electrode of N-channel MOS pipe Q1, tie point is connected with input negative terminal Vi-simultaneously, the drain electrode of N-channel MOS pipe Q1 is connected with output negative terminal Vo-.
Referring to Fig. 5, the application process of simultaneous switching circuit in Switching Power Supply is: test side Vi+ connects just (output of figure acceptance of the bid "+") of output of rectifier bridge 11 in rectification circuit 10, i.e. the input filter capacitor C of pfc circuit 12
apositive pole (A); Input negative terminal Vi-is connected to PFC output capacitance C
bthe negative pole output of (Fig. 5 unit 12 get the bid "-"); Sharing anode Vo+ and be connected to the positive pole (B) of PFC output capacitance, is also the get the bid output of "+" of Fig. 5 unit 12, just (in Fig. 5 unit 22 get the bid the input of "+") of the input that is simultaneously connected to auxiliary power circuit 22; Output negative terminal Vo-is connected to the input of auxiliary power circuit 22 negative (in Fig. 5 unit 22 get the bid the input of "-").
The operation principle of the synchro switch that this PFC uses is:
In the time that pfc circuit 12 is not worked, this moment, main power circuit 21 is not also synchronously worked, and this is the inherent function of the integrated circuit of global each major company release.In pfc circuit 12, generally all with charging diode D
bno matter, the alternating voltage U of input
aCbe how many, in Fig. 5, owing to there being capacitor C
a, its load is very light, and discharging current is minimum, the voltage that A is ordered the same with B point (B point voltage can be lower slightly), is all comparatively level and smooth direct current, is 2 times of the √ of input AC piezoelectric voltage effective value, be that voltage difference between A, B point is very little, A point voltage is slightly high, exceeds a D
bpressure drop.The value of resistance R 1 is very large, the value of R2 is less, be that lower end (A point) voltage of resistance R 1 (shares anode Vo+ to the upper end of resistance R 2, with B point) pressure reduction (be designated hereinafter simply as A, B point pressure reduction) very little, the not enough 0.5V of terminal voltage of resistance R 2, at this moment, positive-negative-positive triode T1 is in cut-off state, so, its collector electrode is subject to resistance R 3, drop-down and the output low level of R4, N-channel MOS pipe Q1 is also in cut-off state, the input of auxiliary power circuit 22 is negative in open-circuit condition so, auxiliary power circuit 22 is not worked, realization and main power circuit 21 are synchronous, no-output voltage.
In the time that pfc circuit 12 is worked, also synchronous working of main power circuit 21, this moment, no matter the alternating voltage U of input
aCbe how many, in Fig. 5, the voltage peak that A is ordered is 2 times of the √ of input AC electricity effective value, and is Rectified alternating current, and B point must rise pressure, it is the crest voltage that B point voltage is ordered higher than A, input 110VAC as described in the background art, pfc circuit is only raised to 200V PFC output voltage, B point voltage is 200V so, and the crest voltage that A is ordered is 110V × 1.414=155.5V, deduct the droop loss of rectification, so, A point voltage peak value is 152V left and right, direct current effective value is still 110V, A, the minimum value of B point pressure reduction is 200V-152V=48V, mean value reaches 200V-110V=90V, so, the terminal voltage of resistance R 2 is enough to allow triode T1 in magnifying state, because the value of resistance R 3 is larger, its collector electrode output high level, at this moment the grid of metal-oxide-semiconductor Q1 is the dividing potential drop of resistance R 4 to the voltage of source electrode, for safety, this voltage can not exceed the largest gate of metal-oxide-semiconductor Q1, source electrode bears voltage, generally below 20V, require to be greater than grid, the source electrode door capable of being opened voltage limit V of metal-oxide-semiconductor Q1 simultaneously
gS, at this moment metal-oxide-semiconductor Q1 conducting, its internal resistance is very low, i.e. R
ds (ON)very low, auxiliary power circuit 22 directly obtains PFC output voltage and normally works, and almost starts with main power circuit 21 simultaneously, sets up output voltage.
If do not adopt intelligent pfc circuit, input 110VAC is upgraded to 380V, A, B point pressure reduction is up to 270V, and circuit is same normally works, and in the time that pfc circuit 12 is not worked, A, B point pressure reduction is still very little, N-channel MOS pipe Q1 is also in cut-off state.
The effect of capacitor C 1: because this circuit is for Switching Power Supply, disturb large, cause that for fear of strong jamming false triggering appears little electric current detecting action and in triode T1, at the emitter of positive-negative-positive triode T1 between base stage, an also low capacity capacitor C 1 that high-frequency loss is little in parallel, generally select COG (NPO) electric capacity in patch capacitor, low capacity electric capacity in the industry cycle refers generally to the electric capacity below 1000pF, comprise 1000pF, in reality debugging, 33pF to 100pF effect is just fine, becoming an electric capacity with more than two Capacitance parallel connection is common practise, can obtain wider operating frequency.In embodiment mono-, used the 1000pF electric capacity of the JOHANSON brand of FENGHUA ADVANCED TECHNOLOGY's production, actual measurement is in the radiation field intensity of 20V/m, and the frequency of radiation field is from 150KHz to 1GHz, and the present invention all can normally work.And do not add the contrast model machine of this electric capacity, and radiation field intensity is during to 3V/m, and a lot of frequency ranges all can not be worked, as at 1MHz, 4MHz.
On the other hand, in the time of pfc circuit 12 normal work, A point voltage is Rectified alternating current, and capacitor C 1 has certain filter action, stablizes the work of positive-negative-positive triode T1.
Operation principle simplify explanation: form testing circuit by positive-negative-positive triode T1 and peripheral resistance R 1, R2, capacitor C 1, the lower end of resistance R 1 connects the pfc circuit front end of BOOST, i.e. the output of rectifier bridge 11, the input filter capacitor C of pfc circuit before PFC
athe voltage difference upper, and the emitter of triode T1 is connected on the output high pressure of PFC, the boosting while utilizing the pfc circuit 12 of BOOST to work produces, allows triode T1 conducting, by resistance R 3 driving N channel MOS tube Q1, and metal-oxide-semiconductor Q1 conducting practical function; And in the time that the pfc circuit 12 of BOOST is not worked, A, B two point voltages are poor little, triode T1 cut-off, turn-offs metal-oxide-semiconductor Q1 and realizes shutoff.
, the embodiment of the present invention one is applicable to the intelligent pfc circuit that PFC output voltage changes with input ac voltage.
Synchro switch 30 of the present invention, for the synchro switch of relay, owing to adopting transistor circuit to realize switch synchronizing function, has dwindled the volume of simultaneous switching circuit greatly.In addition the response time of triode T1 and metal-oxide-semiconductor Q1 is about about 1uS, and the time delay of circuit is mainly from the input junction capacitance C of metal-oxide-semiconductor Q1
iss, in the time of the collector electrode output high level of triode T1, the input junction capacitance C by resistance R 3 to metal-oxide-semiconductor Q1
isscharging causes, the input junction capacitance C of metal-oxide-semiconductor Q1
issgenerally at hundreds of pF between several thousand pF, by selecting well resistance R 3, R4, this delay time can be regulated according to actual needs voluntarily completely, from 1mS to 1S, even longer can realization, certainly this need to be between the grid of metal-oxide-semiconductor Q1 and source electrode suitably and electric capacity, to increase delay time.
Because electronic circuit does not exist mechanical contact, thereby get rid of the sparking factor of contact in the relay of existing synchro switch, thereby can meet the high request of the high risk industries such as colliery to electrical safety completely.Again because the composition number of devices of synchro switch is few, and structural design is simple, is easy to circuit debugging, is easier to the realization of producing.
The circuit that the Chinese application number of mentioning in background technology is 201410332233.1 cannot be operated on intelligent pfc circuit, and first embodiment of the invention is applicable to the intelligent pfc circuit that PFC output voltage changes with input ac voltage, and this is significant progress.
Below provide the effect that one group of experimental data illustrates the first embodiment, resistance R 1 is the 0805 Chip-R series connection of three 10M Ω, obtains the resistance of 30M Ω, uses resistance series connection to obtain higher withstand voltage simultaneously, and this is known technology, is still equal to former resistance; Resistance R 2 is 0805 Chip-R of 3.3M Ω, and resistance R 3 is the 0805 Chip-R series connection of two 10M Ω, obtains the resistance of 20M Ω left and right, obtains higher withstand voltage simultaneously; Resistance R 4 is 0805 Chip-R of 820K Ω; The COG electric capacity that capacitor C 1 is 1000pF, withstand voltage is 50V; Triode T1 is FMMT558, and metal-oxide-semiconductor Q1 model is 4N60;
After circuit welds, actual measurement circuit is under input 220VAC, and in the time that pfc circuit 12 is not worked, the output voltage of PFC is 309V, and simultaneous switching circuit static working current of the present invention is 0uA, and quiescent dissipation is 0mW; In the time that PFC normally works, the output voltage of PFC is 386V, and simultaneous switching circuit static working current of the present invention is 23.9uA, and quiescent dissipation is 9.3mW, and the voltage of driven MOS pipe Q1 is 15.2V.Switching Power Supply below rear continued access 75W is all normally worked, and it should be noted that follow-up auxiliary power circuit 22, need to remove rectification circuit, and the electrochemical capacitor that filtering is used only retains the little electric capacity of high pressure of filtering high frequency ripple, and general capacity is no more than 0.47uF.
In the time that AC-input voltage is adjusted to 85VAC, the output voltage of pfc circuit 12 drops to 254V, and circuit of the present invention still can normally be worked, and the voltage of driven MOS pipe Q1 is 10.0V, still good driven MOS pipe Q1.And the circuit that the Chinese application number of mentioning in background technology is 201410332233.1 can not have been worked, no matter whether pfc circuit 12 works, and auxiliary power circuit 22 is not all worked.
Obviously, in the first embodiment, do not have the device such as electrochemical capacitor, inductance, its volume can do very littlely, is easy to being integrated.
The second embodiment
Fig. 7 shows the synchro switch schematic diagram that the PFC of the second embodiment uses, the simultaneous switching circuit that a kind of PFC uses, be with the difference of the first embodiment, also comprise voltage-stabiliser tube VD1, voltage-stabiliser tube VD1 is in parallel with grid, the source electrode of described N-channel MOS pipe Q1, the negative electrode that is voltage-stabiliser tube VD1 is connected with the grid of metal-oxide-semiconductor Q1, and the anode of voltage-stabiliser tube VD1 is connected with the source electrode of metal-oxide-semiconductor Q1.Be no more than the voltage stabilizing value of voltage-stabiliser tube VD1 with the gate drive voltage of restriction metal-oxide-semiconductor Q1, thereby grid, the source electrode of protection metal-oxide-semiconductor Q1 are not breakdown, have further ensured stability and reliability that synchro switch is worked under high pressure occasion.Fig. 7 circuit is replaced to empty frame 30 parts in Fig. 5, by following connection:
Test side Vi+ connects just (output of figure acceptance of the bid "+") of output of rectifier bridge 11 in rectification circuit 10, the i.e. positive pole of the input filter capacitor of pfc circuit 12 (A); Input negative terminal Vi-is connected to the negative pole output of (Fig. 5 unit 12 get the bid "-") of PFC output capacitance; Sharing anode Vo+ and be connected to the positive pole (B) of PFC output capacitance, is also the get the bid output of "+" of Fig. 5 unit 12, just (in Fig. 5 unit 22 get the bid the input of "+") of the input that is simultaneously connected to auxiliary power circuit 22; Output negative terminal Vo-is connected to the input of auxiliary power circuit 22 negative (in Fig. 5 unit 22 get the bid the input of "-").
Certainly, while using voltage-stabiliser tube VD1, resistance R 4 can be saved, and resistance R 4 can substitute with voltage-stabiliser tube VD1.
Operation principle, with the first embodiment, repeats no more here.
Below provide the effect that one group of experimental data illustrates the first embodiment, resistance R 1 is the 0805 Chip-R series connection of three 6.8M Ω, obtains the resistance of 20.4M Ω; Resistance R 2 is 0805 Chip-R of 2.2M Ω, and resistance R 3 is the 0805 Chip-R series connection of two 6.8M Ω, obtains the resistance of 13.6M Ω left and right; Resistance R 4 is 0805 Chip-R of 6.8M Ω; The COG electric capacity that capacitor C 1 is 330pF, withstand voltage is 25V; Triode T1 is STN93003, and metal-oxide-semiconductor Q1 model is IPA60R190C6; Voltage-stabiliser tube VD1 voltage stabilizing value is generally selected between 7.5V to 20V, has selected the voltage-stabiliser tube of 15V/0.5W here.
After circuit welds, actual measurement circuit is under input 220VAC, and in the time that pfc circuit 12 is not worked, the output voltage of PFC is 309V, and simultaneous switching circuit static working current of the present invention is 0uA, and quiescent dissipation is 0mW; In the time that PFC normally works, the output voltage of PFC is 411V, simultaneous switching circuit static working current of the present invention is 39.6uA, quiescent dissipation is 16.2mW, the voltage of driven MOS pipe Q1 is 15.1V, if remove voltage-stabiliser tube VD1, the voltage of driven MOS pipe Q1 is 136.8V, is enough to puncture grid, the source electrode of metal-oxide-semiconductor Q1.Switching Power Supply below rear continued access 350W is all normally worked, select respectively the flyback power supply of double tube positive exciting Switching Power Supply, 120W of Switching Power Supply, the 350W of the LLC topology of 240W as follow-up auxiliary power circuit 22, it should be noted that, above-mentioned various topologys all need to remove rectification circuit, the electrochemical capacitor that filtering is used, only retain the little electric capacity of high pressure of filtering high frequency ripple, used the CBB electric capacity of 0.47uF/630V here.
Quiescent dissipation is 16.2mW, even ten road auxiliary power circuits in parallel, its quiescent dissipation is 162mW, has realized low-power consumption.
In the time that AC-input voltage is adjusted to 85VAC, the output voltage of pfc circuit 12 drops to 254V, and circuit of the present invention still can normally be worked, and the voltage of driven MOS pipe Q1 is still 15.1V, stably driven MOS pipe Q1.And the circuit that the Chinese application number of mentioning in background technology is 201410332233.1 can not have been worked, no matter whether pfc circuit 12 works, and auxiliary power circuit 22 is not all worked.
In fact, in this example, remove voltage-stabiliser tube VD1, resistance R 4 changes 0805 Chip-R of 560K Ω into, realizes equally the function of embodiment mono-, more than just load capacity rises to 350W.Obviously, in the second embodiment, do not have the device such as electrochemical capacitor, inductance, its volume can do very littlely, is easy to being integrated.
In actual use, when sometimes also thinking to open separately auxiliary power circuit 22, as allowed separately display energising, so that at this moment external notebook computer can realize this function with the 3rd embodiment.
The 3rd embodiment
Fig. 8 shows the simultaneous switching circuit schematic diagram that the PFC of the 3rd embodiment uses, be with the difference of first and second embodiment, also comprise a K switch, K switch is in parallel with emitter, the collector electrode of triode T1, be that switch one end is connected with the emitter of triode T1, the other end of switch is connected with the collector electrode of triode T1.Fig. 8 circuit is replaced to empty frame 30 parts in Fig. 5, by following connection:
Test side Vi+ connects just (output of figure acceptance of the bid "+") of output of rectifier bridge 11 in rectification circuit 10, the i.e. positive pole of the input filter capacitor of pfc circuit 12 (A); Input negative terminal Vi-is connected to the negative pole output of (Fig. 5 unit 12 get the bid "-") of PFC output capacitance; Sharing anode Vo+ and be connected to the positive pole (B) of PFC output capacitance, is also the get the bid output of "+" of Fig. 5 unit 12, just (in Fig. 5 unit 22 get the bid the input of "+") of the input that is simultaneously connected to auxiliary power circuit 22; Output negative terminal Vo-is connected to the input of auxiliary power circuit 22 negative (in Fig. 5 unit 22 get the bid the input of "-").
In the time that pfc circuit 12 is not worked, when thinking to open separately auxiliary power circuit 22, Closing Switch K.When auxiliary power circuit 22 is the equipment such as multimedia loudspeaker box, display, LED illuminating lamp, this function is particularly useful.
Obviously, in embodiment bis-, add described K switch, realize equally goal of the invention.Obviously, in the 3rd embodiment, do not have the device such as electrochemical capacitor, inductance, its volume can do very littlely, is easy to being integrated.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention.For those skilled in the art; without departing from the spirit and scope of the present invention; can also make some improvements and modifications; as sealed in common mode inductance, differential mode inductance in loop; or NTC thermistor; these improvements and modifications also should be considered as protection scope of the present invention, no longer repeat with embodiment here, and protection scope of the present invention should be as the criterion with claim limited range.
Claims (3)
1. the simultaneous switching circuit that PFC uses, comprise four terminals, respectively: test side, input negative terminal, share anode, output negative terminal, it is characterized in that: also comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, electric capacity, positive-negative-positive triode and N-channel MOS pipe, its annexation is: described test side is connected with the base stage of described positive-negative-positive triode by described the first resistance, the emitter of described positive-negative-positive triode is connected with described shared anode, described the second resistance and described electric capacity are all in parallel with emitter with described positive-negative-positive transistor base, the collector electrode of described positive-negative-positive triode is connected with the grid of described the 4th resistance and described N-channel MOS pipe respectively by described the 3rd resistance, the other end of described the 4th resistance is connected with the source electrode of described N-channel MOS pipe, tie point is connected with described input negative terminal simultaneously, the drain electrode of described N-channel MOS pipe is connected with described output negative terminal.
2. the simultaneous switching circuit that PFC according to claim 1 uses, is characterized in that: also comprise voltage-stabiliser tube, the negative electrode of described voltage-stabiliser tube is connected with the grid of described N-channel MOS pipe, and the anode of described voltage-stabiliser tube is connected with the source electrode of described N-channel MOS pipe.
3. the simultaneous switching circuit that PFC according to claim 1 and 2 uses, is characterized in that: also comprise a switch, described switch is in parallel with emitter, the collector electrode of described positive-negative-positive triode.
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| CN105207479A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Controllable boost circuit |
| CN105551885A (en) * | 2015-12-31 | 2016-05-04 | 广州金升阳科技有限公司 | Energy-saving circuit for contactor |
| CN117177402A (en) * | 2023-11-03 | 2023-12-05 | 广东东菱电源科技有限公司 | Three-way output power VCC power supply circuit |
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