CN102368661A - Switching power supply with function of correcting power factor as well as control device and control method thereof - Google Patents
Switching power supply with function of correcting power factor as well as control device and control method thereof Download PDFInfo
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Abstract
本发明公开了一种具有功率因数校正的开关电源及其控制装置，所述开关电源控制装置包括一功率因数校正器和一总谐波失真优化器，所述功率因数校正器的输出端连接所述功率管，决定所述功率管的导通时间和关断时间。所述总谐波失真优化器的输入端输入交流输入电压，输出端连接功率因数校正器，能够动态跟踪交流输入信号，在交流输入电压增大的时候，减小开关电源的电感的峰值电流，补偿交流电网对开关电源的滤波电容充电的电流；在交流输入电压减小的时候，增大开关电源的电感的峰值电流，补偿交流电网对开关电源的滤波电容放电的电流。利用本发明提出的控制装置能够减小所述滤波电容引起的交流输入电流的总谐波失真，提高所述开关电源的功率因数。
The invention discloses a switching power supply with power factor correction and its control device. The switching power supply control device includes a power factor corrector and a total harmonic distortion optimizer. The output end of the power factor corrector is connected to the The power tube is used to determine the turn-on time and turn-off time of the power tube. The input terminal of the total harmonic distortion optimizer inputs the AC input voltage, and the output terminal is connected to a power factor corrector, which can dynamically track the AC input signal, and reduce the peak current of the inductance of the switching power supply when the AC input voltage increases, Compensate the current that the AC grid charges the filter capacitor of the switching power supply; when the AC input voltage decreases, increase the peak current of the inductance of the switching power supply, and compensate the current that the AC grid discharges to the filter capacitor of the switching power supply. The control device proposed by the invention can reduce the total harmonic distortion of the AC input current caused by the filter capacitor, and improve the power factor of the switching power supply.
Description
Technical field
The present invention relates to field of switch power, relate in particular to have power factor correction (Power Factor Correction, Switching Power Supply control technology PFC).
Background technology
Exchange (Alternating Current from 220V; AC) electrical network is supplied with direct current (Direct Current through conversion; DC) be to use a kind of very widely basic conversion equipment in power electronic technology and the electronic instrument, computer for example, television set; Display, the modern electric equipment commonly used of fluorescent lamp or the like all can adopt the AC-DC Switching Power Supply to supply power.
AC-DC Switching Power Supply at present commonly used generally is made up of power factor correction (PFC) device and DC-DC transducer; Wherein said power factor corrector is as preconditioner; Control exchanges input current; Force to exchange input current waveform tracking interchange input sinusoidal voltage waveform, can be so that exchange input current waveform near sine wave.
Said power factor corrector reduces to exchange the input current harmonics composition on the one hand, and the harmonic component that exchanges the input current the inside can flow backwards, and gets into AC network, thereby to the harmonic pollution that causes of AC network; On the other hand, (Total Harmonic Distortion THD), improves the power factor of said Switching Power Supply, can make power factor PF value near 1 to reduce to exchange the total harmonic distortion of input current.
Said power factor corrector adopts boost converter to realize that this boost converter is one of the most frequently used topology that is used for said power factor corrector.The topology of boosting can be operated in the required power pattern, for example can be operated in continuous conduction mode (CCM), be interrupted in conduction mode (DCM) and the critical conduction mode (TM).
Be widely used in the middle low power applications owing to the power factor corrector of TM pattern is simple in structure.In general, the power factor corrector of TM pattern can have following two kinds of implementations: one is based on the power factor corrector of the TM pattern of permanent ON time control; Two are based on the power factor corrector of the TM pattern of multiplier.It has been generally acknowledged that these two kinds of technology provide substantially the same performance level.
As an example, the topological structure of the Switching Power Supply of the power factor corrector that a kind of traditional TM pattern based on multiplier is provided as shown in Figure 1.Switching Power Supply 100 in the example comprises a boost converter and a power factor correcting 101.Said power factor corrector is based on the structure of the TM pattern of multiplier.
Said boost converter comprises a diode full-wave rectification bridge 103, abbreviates rectifier bridge as.The input signal of said rectifier bridge is an AC-input voltage.The end of a high-frequency filter capacitor Cin is connected to said rectifier bridge, the other end ground connection of filter capacitor Cin.An inductance L 1 is connected to the common port of filter capacitor Cin and said rectifier bridge, and an other end of inductance L 1 is connected to the drain terminal of a power tube M1, and the source end of power tube M1 is connected to the sampling resistor Rs of a ground connection.The anode of a diode D1 is connected to the common port of inductance L 1 and power tube M1, and negative electrode is received the end of a capacitor C bulk, the other end ground connection of capacitor C bulk.Said boost converter produces one on capacitor C bulk representative value generally is 400V much larger than the VD that exchanges the input maximum peak voltage, and said VD is provided for DC-DC transducer subsequently.
Said power factor corrector comprises:
Induction by current comparator 106, the output signal Sm of said multiplier is provided said induction by current comparator, as its input signal.Said induction by current comparator another one input is to flow through the voltage Srs that the electric current of said power tube produces on sampling resistor Rs, is called for short current sampling signal Srs.In some implementation, when said induction by current comparator confirmed that two voltages in the input equate, said induction by current comparator resetted trigger 108, and made power tube M1 turn-off.After being handled by said power factor corrector, inductance L 1 peak current of said boost converter is by the sinusoidal waveform institute envelope through rectification.Can prove that said power factor corrector has produced constant ON time in the half period of input ac voltage.
After power tube M1 was turned off, diode D1 was owing to current continuity and by forward bias.As the part of the topology of boosting, inductance L 1 will be discharged into the energy of its storage in the load of said Switching Power Supply.When inductance L 1 electric current dropped to zero, zero current detector 107 detected the zero current condition of said inductance through coupling coil L2.The output of said zero current detector is connected to the set end of said trigger.When said zero current detector detected zero current, said zero current detector was set said trigger.When said trigger was set, power tube M1 began conducting.At the duration of work of said Switching Power Supply, said trigger is by repeatedly set and reset.
In order to satisfy the EMI requirement, said Switching Power Supply increases a little high-frequency filter capacitor Cin in rectifier bridge 103 back.Because the existence of filter capacitor Cin causes said Switching Power Supply can run into the problem of intermodulation distortion, makes that exchanging the input current harmonics component increases, it is big that the distortion factor becomes, thereby cause the power factor value of said Switching Power Supply to diminish.
Traditional method thinks that intermodulation distortion occurs in AC-input voltage between tour.More specifically, intermodulation distortion often occurs in AC-input voltage and drops near near 0 volt the time.In the time of near AC-input voltage drops near 0 volt, because the remnants on the filter capacitor Cin are detained voltage, the diode of said rectifier bridge is reverse biased, and the said remaining voltage that is detained is associated with filter capacitor Cin and said rectifier bridge.During this period, do not exchange input current and flow out from said rectifier bridge.As a result, the waveform of interchange input current possibly present the intermodulation distortion effect.Cause AC-input voltage to drop near 0 o'clock, the voltage on the filter capacitor Cin can depart from ideal value usually in a bit of time.
As shown in Figure 2, because the existence of filter capacitor Cin, make AC-input voltage after rectification, during voltage zero-cross, produce distortion, can cause exchanging input current and when zero passage, also can produce distortion, and then make and exchange the input current distortion factor and increase.
Traditional method is in order to reduce the intermodulation distortion effect; The method that adopts is when AC-input voltage is very near zero; Prolong the ON time of said power tube; Bleed off some to the electric charge on the said filter capacitor more, just can reduce voltage distortion on the said filter capacitor, thereby reach the purpose of optimizing the total harmonic distortion that exchanges input current.
Yet but there is some deficiency in said traditional method, and main cause is it some is unilateral and careful inadequately to the analysis that exchanges the influence of input current total harmonic distortion to filter capacitor Cin.In fact the main cause that exchanges input current generation total harmonic distortion is because said filter capacitor Cin can produce charging and discharging current.This electric current input that is added to causes actual interchange input current and AC-input voltage homophase completely.When the electric current that when the discharge of said filter capacitor, provides in addition just can offer output circuit, AC network is input current more just, produces so-called conducting dead angle.
Electric current above the said filter capacitor is:
I
Cin＝Cin×U
0×ω×cosωt (1)
U wherein
0Be alternating current input voltage magnitude, ω is a frequency input signal, and Cin is said filter capacitor appearance value.
When said filter capacitor discharging current surpasses output current I
OThe time, AC network is input current more just.Therefore the conducting dead angle is:
α＝arccos(I
O/(Cin×U
0×ω)) (2)
Can find out that from formula the conducting dead angle is with AC-input voltage, the relation between said filter capacitor and the output current.
As shown in Figure 2, said filter capacitor Cin charged in the half period of the rising of AC-input voltage, in the half period that AC-input voltage descends, discharged.When the AC-input voltage zero passage, the charging and discharging currents of said filter capacitor reaches maximum, and consequent current distortion also is maximum.
Said traditional method is not considered; At the voltage zero-cross place, said filter capacitor becomes the situation of maximum charging current by maximum discharge current, and therefore said traditional method is just when AC-input voltage is very near zero; Prolong the ON time of said power tube; Electric charge above the said filter capacitor is bled off some more, be can not full remuneration because the charging and discharging currents distortion that said filter capacitor produces, the distortion that produces in the time of can only compensating said filter capacitor maximum discharge current.
In said filter capacitor charging:
I
IN＝I
CC+I
L (3)
And in said filter capacitor discharge:
I
IN+I
CD＝I
L (4)
I wherein
INBe to exchange input current, I
LBe said inductance peak current, I
CCBe said filter capacitor charging current, I
CDIt is said filtered circuit discharging current.
Said filter capacitor discharges and recharges and causes because the current waveform distortion is, so in order to optimize total harmonic distortion, must compensate because said filter capacitor discharges and recharges the current waveform distortion that causes.
Summary of the invention
The present invention will solve the deficiency of the total harmonic distortion optimization method existence of current power factor adjuster, and a kind of switch power controller and control method thereof with power factor correction is provided.The present invention has simultaneously also offered a kind of Switching Power Supply with power factor correction.
Switching Power Supply with power factor correction comprises:
One switch power converter converts AC-input voltage to direct-flow output signal.Said switch power converter comprises a high-frequency filter capacitor, an inductance and a power tube;
One Switching Power Supply control device, said Switching Power Supply control device comprise a power factor corrector and a total harmonic distortion optimization device, and the output of said power factor corrector connects said power tube, determine the ON time and the turn-off time of said power tube.The input input AC input voltage of said total harmonic distortion optimization device; Output connects power factor corrector; Can the dynamic tracking ac input signal; When AC-input voltage increases, reduce the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor charging; When AC-input voltage reduces, increase the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor discharge.
Said power factor corrector comprises:
One error amplifier, the inverting input of said error amplifier are the dividing potential drops of the VD of Switching Power Supply, and the normal phase input end of said error amplifier is a reference voltage;
One multiplier, the rectification and voltage division signal that an input of said multiplier is an AC-input voltage; Another input of said multiplier is from the output signal of said error amplifier;
One induction by current comparator, the output signal and the current sampling signal of more said multiplier, the output of said induction by current comparator connects trigger, the output signal deciding of induction by current comparator the turn-off time of said power tube;
One zero current detector is used for zero current condition in the inductance in the sense switch power supply changeover device, and the output of said zero current comparator connects said trigger, the output signal deciding of zero current comparator the ON time of said power tube;
One trigger, the output of said trigger connects drive circuit;
One drive circuit, the output of said drive circuit connects said power tube.
Wherein, said current sampling signal is the voltage that the electric current of said power tube produces on sampling resistor Rs;
Further, said total harmonic distortion optimization device can the dynamic tracking ac input signal, when AC-input voltage increases, reduces the value of the output signal of said multiplier, perhaps increases the value of said current sampling signal; When AC-input voltage reduces, increase the value of the output signal of said multiplier, perhaps reduce the value of said current sampling signal.
Have the control method of the Switching Power Supply of power factor correction, comprising:
Step 1, ac input signal converts direct-flow output signal to;
Step 2 compares the said direct-flow output signal and first reference signal, produces an error amplification signal;
Step 3, said error amplification signal and said ac input signal multiplied each other produces a product signal;
Step 4 compares said product signal and sampled signal, when said sampled signal is equal to or greater than said product signal, produces a power tube cut-off signals, stops from the inductance absorption current;
Step 5 compares the detection signal and second reference signal, when said detection signal is equal to or less than said second reference signal, produces a power tube Continuity signal, begins from said inductance absorption current.
When ac input signal increases, reduce the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor charging; When ac input signal reduces, increase the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor discharge.
Wherein, to represent current sampling signal be the voltage that the electric current of said power tube produces on sampling resistor to said sampled signal; Wherein, on behalf of coupling coil, said detection signal detect the zero current condition of said inductance.
Switching Power Supply that the present invention proposes and control device thereof can reduce the total harmonic distortion of the interchange input current that said filter capacitor causes, improve the power factor of said Switching Power Supply.
Description of drawings
Fig. 1 is the topological structure of Switching Power Supply of the power factor correction of traditional TM pattern based on multiplier;
Fig. 2 is the input current of Switching Power Supply shown in Figure 1, and voltage and filter capacitor discharge and recharge waveform
Fig. 3 is the topological structure that the present invention proposes to have the switching power unit of power factor correction;
Fig. 4 is first specific embodiment of total harmonic distortion optimization device of the present invention;
Fig. 5 is second specific embodiment of total harmonic distortion optimization device of the present invention;
Fig. 6 is the topological structure of voltage rising or decline detector;
Fig. 7 is the 3rd specific embodiment of total harmonic distortion optimization device of the present invention;
Fig. 8 is the 4th specific embodiment of total harmonic distortion optimization device of the present invention;
Fig. 9 is the possible topological structure that filter capacitor discharges and recharges analog circuit among the present invention.
Embodiment
Below in conjunction with accompanying drawing, further describe invention essence of the present invention and concrete technical scheme.
Fig. 3 is the Switching Power Supply with power factor correction that the present invention proposes, and this Switching Power Supply is based on the topological structure of the TM pattern of multiplier.
Switching Power Supply 300 among Fig. 3 comprises a boost converter and a Switching Power Supply control device 301:
Said boost converter comprises a diode full-wave rectification bridge 303, abbreviates rectifier bridge as.The input signal of said rectifier bridge is an AC-input voltage.The end of a high-frequency filter capacitor Cin is connected to said rectifier bridge, the other end ground connection of filter capacitor Cin.An inductance L 1 is connected to the common port of filter capacitor Cin and said rectifier bridge, and an other end of inductance L 1 is connected to the drain terminal of a power tube M1, and the source end of power tube M1 is connected to the sampling resistor Rs of a ground connection.The anode of a diode D1 is connected to the common port of inductance L 1 and power tube M1, and negative electrode is received the end of a capacitor C bulk, the other end ground connection of capacitor C bulk.Said switch power converter produces one on capacitor C bulk representative value generally is 400V much larger than the VD that exchanges the input maximum peak voltage, and said VD is provided for DC-DC transducer subsequently.
Said Switching Power Supply control device 301 comprises a power factor corrector 311 and a total harmonic distortion optimization device 310
Said power factor corrector comprises:
One error amplifier 304, said error amplifier is two input signals relatively: the input signal of its inverting input is the dividing potential drop that the VD of said switch power converter produces through resistance R _ f a and resistance R _ f b; The input signal of its normal phase input end is internal reference voltage VREF.It is said that to misplace output signal Se be the amplifying signal of error between two input signals.Between the inverting input of error amplifier and output, a compensating network 302 is arranged.
One multiplier 305; The said output signal Se that misplaces is provided for said multiplier 305; Said multiplier 305 another one input signals are that AC-input voltage is through after the described rectifier bridge rectification; The dividing potential drop Vi that produces through resistance R 1a and resistance R 1b again is called for short the rectification and voltage division signal, and the output signal Sm of multiplier is the product of two input signals.
One induction by current comparator 306, the output signal Sm of said multiplier is provided said induction by current comparator, as its input signal; Said induction by current comparator another one input is to flow through the voltage Srs that the electric current of described power tube produces on sampling resistor Rs, is called for short current sampling signal.The output of said induction by current comparator connects trigger 308, and said induction by current comparator output signal has determined the turn-off time of said power tube.
One zero current detector 307, be used in the inductance in the sense switch power supply changeover device zero current condition, the output of said zero current comparator 307 connects said trigger, the output signal deciding of zero current comparator the ON time of said power tube.
One drive circuit 309, the input of said drive circuit are the output signals of said trigger, and the output of said drive circuit connects power tube MI.
After being handled by said power factor corrector, inductance L 1 peak current of said switch power converter is by the sinusoidal waveform institute envelope through rectification.For example, can prove in half period of said power factor corrector place input ac voltage and produced constant ON time.
After power tube M1 was turned off, diode D1 was owing to current continuity and by forward bias.As the part of the topology of boosting, inductance L 1 will be discharged into the energy of its storage in the load of said Switching Power Supply.When inductance L 1 electric current dropped to zero, said zero current detector was through the zero current condition that detects said inductance of coupling coil L2.The output of said zero current detector is connected to the set end of said trigger.When said zero current detector detected zero current, said zero current detector was set said trigger.When said trigger was set, said power tube M1 began conducting.At said Switching Power Supply duration of work, said trigger is by repeatedly set and reset.
Said total harmonic distortion optimization device 310 is accepted from rectification and voltage division signal Vi, exports a total harmonic distortion (THD) and optimizes signal Ctrl.Can the dynamic tracking ac input signal, when AC-input voltage increases, reduce the value of the output signal Sm of said multiplier 305, perhaps increase the value of said current sampling signal Srs; When AC-input voltage reduces, increase the value of the output signal Sm of said multiplier 305, perhaps reduce the value of said current sampling signal Srs.Said total harmonic distortion optimization device can reduce the total harmonic distortion of the interchange input current that said filter capacitor causes, improves the power factor of said Switching Power Supply.
Described Switching Power Supply control device is a chip.
Fig. 4 is first specific embodiment of said total harmonic distortion optimization device, and described total harmonic distortion optimization device comprises:
One subtracter 401 from a constant signal A1, deducts after the rectification and voltage division signal Vi, through a weighter 402, produces an offset compensation signal Vi1;
One voltage rises or decline detector 403, and said voltage rising or decline detector judge that according to rectification and voltage division signal Vi said rectification and voltage division signal Vi is in enlarging state, still reduces state.When said rectification and voltage division signal Vi increased, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal Ctrl, the offset compensation signal Vi1 that equals to bear; When said rectification and voltage division signal Vi reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal Ctrl, equals positive offset compensation signal Vi1;
One adder 404 adds the above total harmonic distortion (THD) optimization signal Ctrl inside the output signal Sm of multiplier 305, offer the inverting input of induction by current comparator 306.
Fig. 5 is second specific embodiment of said total harmonic distortion optimization device.Described total harmonic distortion optimization device comprises:
One subtracter 501 from a constant signal A1, deducts after the rectification and voltage division signal Vi, through a weighter 502, produces an offset compensation signal Vi1;
One voltage rises or decline detector 503, and said voltage rising or decline detector judge that according to rectification and voltage division signal Vi said rectification and voltage division signal Vi is in enlarging state, still reduces state.When said rectification and voltage division signal Vi increased, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal Ctrl, the offset compensation signal Vi1 that equals to bear; When said rectification and voltage division signal Vi reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal Ctrl, equals positive offset compensation signal Vi1;
A subtracter 504 deducts total harmonic distortion (THD) from current sampling signal Srs the inside and optimizes signal Ctrl, offers the normal phase input end of induction by current comparator 306.
Fig. 6 is a specific embodiment of rising of voltage described in Fig. 4 or Fig. 5 or decline detector.Said voltage rises or the basic thought of decline detector 600 is to use sampling hold circuit and currency method relatively to detect rising and falling waveform: when upward up voltage is higher than a certain value of sustaining voltage (being assumed to be 50mV), and the rising edge sampling; When drop-out voltage is lower than a certain value of sustaining voltage (being assumed to be 50mV), the trailing edge sampling; When rise and fall voltage and sustaining voltage deviation (are assumed to be 50mV) in a certain value, do not sample.
Said rectification and voltage division signal Vi is provided for level shift module 601.Said level shift module produces three level shift signals: the first level shift signal V0 equals said rectification and voltage division signal Vi; The second level shift signal Va equals said rectification and voltage division signal Vi and adds a deviation delta; The 3rd level shift signal Vb equals said rectification and voltage division signal Vi and deducts a deviation delta.The said second level shift signal Va offers the sampling comparator 602 that descends; Said the 3rd level shift signal Vb offers up-samples comparator 603.Inhibit signal Vsamp above the electric capacity 607 is offered said up-samples comparator and said decline sampling comparator simultaneously.
Said decline sampling more said second level shift signal Va of comparator and said inhibit signal Vsamp produce decline sampled signal Vc and offer rest-set flip-flop 605 and sampling pulse generator 604.More described the 3rd level shift signal Vb of said up-samples comparator and said inhibit signal Vsamp produce up-samples signal Vd and offer said rest-set flip-flop and said sampling pulse generator.Said sampling pulse generator control switch 606 is sampled when said switch closure, and said inhibit signal Vsamp equals the said first level shift signal V0, just said rectification and voltage division signal Vi; When said switch breaks off,, get into the maintenance stage because electric capacity 607 exists.Said rest-set flip-flop produces judges signal Ve.
The effect of said sampling pulse generator is in said decline sampled signal Vc or said up-samples signal Vd, to have one during by low saltus step high, the pulse of a high level fix pulsewidth of output, and closed said switch gets into sample phase.
Said voltage raises or reduces the sensors work process: the incipient stage, said sampling pulse generator is action not, and therefore said switch breaks off.If said rectification and voltage division signal Vi raises, said decline sampled signal Vc is always zero.Therefore as long as said up-samples comparator uprises once, said judgement signal Ve is always 1, representes that said rectification and voltage division signal Vi is in the rising state.Because as long as said the 3rd level shift signal Vb is higher than said inhibit signal Vsamp; Saltus step just takes place in said up-samples comparator; Cause the said switch closure of signal controlling of a high level fix pulsewidth of said sampling pulse generator output, will sample said rectification and voltage division signal Vi to electric capacity 607.So said rectification and voltage division signal Vi uphill process, the maximum difference of inhibit signal Vsamp and said rectification and voltage division signal Vi is less than Δ.
If said rectification and voltage division signal Vi voltage descends, said up-samples signal Vd is always zero.Therefore as long as said decline sampling comparator uprises once, described judgement signal Ve is always 0, and expression is in said rectification and voltage division signal Vi decline state.Because as long as the said second level shift signal Va is lower than said inhibit signal Vsamp; Saltus step just takes place in said decline sampling comparator; Cause the said switch closure of signal controlling of a high level fix pulsewidth of said sampling pulse generator output, will sample said rectification and voltage division signal Vi voltage to electric capacity 607.So said rectification and voltage division signal Vi decline process, the maximum difference of inhibit signal Vsamp and said rectification and voltage division signal Vi is less than Δ.The purpose of Δ setting is in order to prevent circuit generation misoperation.
Said voltage raises or reduces the judgement signal Ve that detector produces.Be said rectification and voltage division signal Vi when raising (Ve is 1), represent the filter capacitor Cin charging stage, reduce the peak current of said inductance, the electric current that the compensation AC network charges to said filter capacitor; When said rectification and voltage division signal Vi reduces (Ve is 0), represent said filter capacitor Cin discharge regime, increase the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor discharge.
Fig. 7 is the 3rd specific embodiment of said total harmonic distortion optimization device, and described total harmonic distortion optimization device comprises:
One filter capacitor discharges and recharges analog circuit 702, can come the charge and discharge process of analog filtering capacitor C in according to rectification and voltage division signal Vi and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal Ctrl;
One adder 703 adds total harmonic distortion (THD) optimization signal Ctrl inside the output signal Sm of said multiplier, offer the inverting input of induction by current comparator 306.
Fig. 8 is the 4th specific embodiment of said total harmonic distortion optimization device, and described total harmonic distortion optimization device comprises:
One filter capacitor discharges and recharges analog circuit 802, can come the charge and discharge process of analog filtering capacitor C in according to rectification and voltage division signal Vi and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal Ctrl;
One subtracter 803 deducts total harmonic distortion (THD) from said current sampling signal Srs the inside and optimizes signal Ctrl, offers the normal phase input end of induction by current comparator 306.
Fig. 9 is the possible topological structure that Fig. 7 or filter capacitor shown in Figure 8 discharge and recharge analog circuit.The base input signal of the one NPN pipe Q1 is rectification and voltage division signal (Vi); The collector electrode of the 4th NPN pipe Q1 is received power supply; The emitter of the one NPN pipe Q1 is received the constant-current source I2 of a ground connection, and the base stage of the 4th PNP pipe Q4 is received the common port of NPN pipe Q1 and constant-current source I2; The base input signal of the 2nd PNP pipe Q2 is rectification and voltage division signal Vi; The collector electrode of the 2nd PNP pipe Q2 is received ground; The emitter of the 2nd PNP pipe Q2 is received a constant-current source I1 who connects power supply, and the base stage of the 3rd NPN pipe Q3 is received the common port of the 2nd PNP pipe Q2 and constant-current source I1; The emitter of the 3rd NPN pipe Q3 links to each other with the emitter of the 4th PNP pipe Q4, receives an other end ground connection of described first capacitor C, 1, the second capacitor C 1; The collector electrode of the 3rd NPN pipe Q3 is received the input stage of the current mirror of being made up of PMOS pipe M1 and the 2nd PMOS pipe M2; The collector electrode of the 4th PNP pipe Q4 is received the input stage of the current mirror of being made up of the 3rd NMOS pipe M3 and the 4th NMOS pipe M4, and the output stage of described two current mirrors links to each other, and exports said total harmonic distortion optimization signal (Ctrl)
The invention discloses a kind of switching power unit that can reduce the power factor controlling of intermodulation distortion, and illustrate and describe embodiment of the present invention and effect.What should be understood that is that the foregoing description is just to explanation of the present invention; Rather than limitation of the present invention; Any innovation and creation that do not exceed in the connotation scope of the present invention; Comprise that total harmonic distortion optimization device, voltage rising or decline detector, filter capacitor discharge and recharge the change of analog circuit and the replacement or the modification of other unsubstantialities, all fall within the protection range of the present invention.
Claims (28)
1. have the Switching Power Supply of power factor correction, comprising:
One switch power converter converts AC-input voltage to direct-flow output signal, and said switch power converter comprises rectifier bridge, fly-wheel diode, shunt capacitance, high-frequency filter capacitor, an inductance and a power tube; With a Switching Power Supply control device, it is characterized in that:
Said Switching Power Supply control device comprises a power factor corrector and a total harmonic distortion optimization device; The output of said power factor corrector connects said power tube; Determine the ON time and the turn-off time of said power tube, the input input AC input voltage of said total harmonic distortion optimization device, output connects power factor corrector; Can the dynamic tracking ac input signal; When AC-input voltage increases, reduce the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor charging; When AC-input voltage reduces, increase the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor discharge.
2. the Switching Power Supply that has power factor correction according to claim 1 is characterized in that said power factor corrector comprises:
One error amplifier, the inverting input of said error amplifier are the dividing potential drops of the VD of Switching Power Supply, and the normal phase input end of said error amplifier is a reference voltage, amplify the dividing potential drop of said VD and the error between the reference voltage;
One multiplier, the rectification and voltage division signal that an input of said multiplier is an AC-input voltage; Another input of said multiplier is from the output signal of said error amplifier, and multiplier is with the signal multiplication of its two inputs;
One induction by current comparator, the output signal and the current sampling signal of more said multiplier, the output of said induction by current comparator connects trigger, the output signal deciding of induction by current comparator the turn-off time of said power tube;
One zero current detector is used for zero current condition in the inductance in the sense switch power supply changeover device, and the output of said zero current comparator connects said trigger, the output signal deciding of zero current comparator the ON time of said power tube;
One trigger, the output of said trigger connects drive circuit;
One drive circuit, the output of said drive circuit connects said power tube.
3. like the said Switching Power Supply of claim 2, it is characterized in that said current sampling signal is the voltage that the electric current of said power tube produces on sampling resistor with power factor correction.
4. like the said Switching Power Supply of claim 2 with power factor correction; It is characterized in that said total harmonic distortion optimization device; Can the dynamic tracking ac input signal; When AC-input voltage increases, reduce the value of the output signal of said multiplier, perhaps increase the value of said current sampling signal; When AC-input voltage reduces, increase the value of the output signal of said multiplier, perhaps reduce the value of said current sampling signal.
5. like claim 2,3 or 4 said Switching Power Supplies, it is characterized in that said total harmonic distortion optimization device comprises with power factor correction:
One subtracter from a constant signal (A1), deducts rectification and voltage division signal (Vi) afterwards, through a weighter, produces an offset compensation signal (Vi1);
One voltage rises or the decline detector; Said voltage rising or decline detector are according to rectification and voltage division signal (Vi); Judge that said rectification and voltage division signal (Vi) is in enlarging state; Still reduce state: when said rectification and voltage division signal Vi increased, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), the offset compensation signal (Vi1) that equals to bear; When said rectification and voltage division signal (Vi) reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), equals positive offset compensation signal (Vi1);
One adder adds the above total harmonic distortion (THD) optimization signal (Ctrl) inside the output signal Sm of multiplier, offer the inverting input of induction by current comparator.
6. like claim 2,3 or 4 said Switching Power Supplies, it is characterized in that said total harmonic distortion optimization device comprises with power factor correction:
One subtracter from a constant signal (A1), deducts rectification and voltage division signal (Vi) afterwards, through a weighter, produces an offset compensation signal (Vi1);
One voltage rises or the decline detector; Said voltage rising or decline detector are according to rectification and voltage division signal (Vi); Judge that said rectification and voltage division signal (Vi) is to be in enlarging state, still reduce state, when said rectification and voltage division signal (Vi) increases; Said voltage rises or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), the offset compensation signal (Vi1) that equals to bear; When said rectification and voltage division signal Vi reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), equals positive offset compensation signal (Vi1);
A subtracter deducts total harmonic distortion (THD) from current sampling signal (Srs) the inside and optimizes signal (Ctrl), offers the normal phase input end of induction by current comparator.
7. like claim 5 or 6 said Switching Power Supplies with power factor correction; It is characterized in that said voltage rises or the implementation of decline detector is: said rectification and voltage division signal (Vi) is provided for the level shift module, and said level shift module produces three level shift signals and is respectively: the first level shift signal (V0) equals said rectification and voltage division signal (Vi); The second level shift signal (Va) equals said rectification and voltage division signal (Vi) and adds a deviation delta; The 3rd level shift signal (Vb) equals said rectification and voltage division signal (Vi) and deducts a deviation delta, and the said second level shift signal (Va) offers the sampling comparator that descends; Said the 3rd level shift signal (Vb) offers the up-samples comparator, and the inhibit signal Vsamp above the electric capacity is offered said up-samples comparator and said decline sampling comparator simultaneously; Said decline sampling more said second level shift signal (Va) of comparator and said inhibit signal (Vsamp); Produce decline sampled signal (Vc) and offer rest-set flip-flop and sampling pulse generator; More described the 3rd level shift signal (Vb) of said up-samples comparator and said inhibit signal (Vsamp); Produce up-samples signal (Vd) and offer said rest-set flip-flop and said sampling pulse generator, said sampling pulse generator control switch is sampled when said switch closure; Said inhibit signal (Vsamp) equals the said first level shift signal (V0), just said rectification and voltage division signal (Vi); When said switch breaks off, because electric capacity exists, get into the maintenance stage, said rest-set flip-flop produces judges signal Ve.
8. like claim 2,3 or 4 said Switching Power Supplies, it is characterized in that said total harmonic distortion optimization device comprises with power factor correction:
One filter capacitor discharges and recharges analog circuit, can come the charge and discharge process of analog filtering electric capacity (Cin) according to rectification and voltage division signal (Vi) and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal (Ctrl);
One adder adds total harmonic distortion (THD) optimization signal (Ctrl) inside the output signal (Sm) of said multiplier, offer the inverting input of induction by current comparator.
9. like claim 2,3 or 4 said Switching Power Supplies, it is characterized in that said total harmonic distortion optimization device comprises with power factor correction:
One filter capacitor discharges and recharges analog circuit, can come the charge and discharge process of analog filtering electric capacity (Cin) according to rectification and voltage division signal (Vi) and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal (Ctrl);
One subtracter deducts total harmonic distortion (THD) from said current sampling signal (Srs) the inside and optimizes signal Ctrl, offers the normal phase input end of induction by current comparator.
10. like claim 8 or 9 said Switching Power Supplies with power factor correction; It is characterized in that the base input signal that said filter capacitor discharges and recharges the NPN pipe Q1 of analog circuit is rectification and voltage division signal (Vi); The collector electrode of the 4th NPN pipe Q1 is received power supply; The emitter of the one NPN pipe Q1 is received the constant-current source I2 of a ground connection, and the base stage of the 4th PNP pipe Q4 is received the common port of NPN pipe Q1 and constant-current source I2; The base input signal of the 2nd PNP pipe Q2 is rectification and voltage division signal Vi; The collector electrode of the 2nd PNP pipe Q2 is received ground; The emitter of the 2nd PNP pipe Q2 is received a constant-current source I1 who connects power supply, and the base stage of the 3rd NPN pipe Q3 is received the common port of the 2nd PNP pipe Q2 and constant-current source I1; The emitter of the 3rd NPN pipe Q3 links to each other with the emitter of the 4th PNP pipe Q4, receives an other end ground connection of described first capacitor C, 1, the second capacitor C 1; The collector electrode of the 3rd NPN pipe Q3 is received the input stage of the current mirror of being made up of PMOS pipe M1 and the 2nd PMOS pipe M2; The collector electrode of the 4th PNP pipe Q4 is received the input stage of the current mirror of being made up of the 3rd NMOS pipe M3 and the 4th NMOS pipe M4, and the output stage of described two current mirrors links to each other, and exports said total harmonic distortion optimization signal (Ctrl).
11. have the control device of the Switching Power Supply of power factor correction; It is characterized in that; Comprise a power factor corrector and a total harmonic distortion optimization device: the output of said power factor corrector is connected the power tube of Switching Power Supply, determines the ON time and the turn-off time of said power tube; The input input AC input voltage of said total harmonic distortion optimization device; Output connects power factor corrector; Can the dynamic tracking ac input signal; When AC-input voltage increases, reduce the peak current of said inductance, the compensation AC network is to the electric current of the filter capacitor charging of Switching Power Supply; When AC-input voltage reduces, increase the peak current of Switching Power Supply inductance, the compensation AC network is to the electric current of the filter capacitor discharge of Switching Power Supply.
12., it is characterized in that said power factor corrector comprises like the said control device of claim 11 with Switching Power Supply of power factor correction:
One error amplifier, the inverting input of said error amplifier are the dividing potential drops of the VD of Switching Power Supply, and the normal phase input end of said error amplifier is a reference voltage, amplify the dividing potential drop of said VD and the error between the reference voltage;
One multiplier, the rectification and voltage division signal that an input of said multiplier is an AC-input voltage; Another input of said multiplier is from the output signal of said error amplifier, and multiplier is with the signal multiplication of its two inputs;
One induction by current comparator, the output signal and the current sampling signal of more said multiplier, the output of said induction by current comparator connects trigger, the output signal deciding of induction by current comparator the turn-off time of said power tube;
One zero current detector is used for zero current condition in the inductance in the sense switch power supply changeover device, and the output of said zero current comparator connects said trigger, the output signal deciding of zero current comparator the ON time of said power tube;
One trigger, the output of said trigger connects drive circuit;
One drive circuit, the output of said drive circuit connects said power tube.
13., it is characterized in that said current sampling signal is the voltage that the electric current of said power tube produces on sampling resistor like the said control device of claim 12 with Switching Power Supply of power factor correction.
14. like the said control device of claim 12 with Switching Power Supply of power factor correction; It is characterized in that said total harmonic distortion optimization device; Can the dynamic tracking ac input signal; When AC-input voltage increases, reduce the value of the output signal of said multiplier, perhaps increase the value of said current sampling signal; When AC-input voltage reduces, increase the value of the output signal of said multiplier, perhaps reduce the value of said current sampling signal.
15., it is characterized in that said total harmonic distortion optimization device comprises like claim 12,13 or 14 said control device with Switching Power Supply of power factor correction:
One subtracter from a constant signal (A1), deducts rectification and voltage division signal (Vi) afterwards, through a weighter, produces an offset compensation signal (Vi1);
One voltage rises or the decline detector; Said voltage rising or decline detector are according to rectification and voltage division signal (Vi); Judge that said rectification and voltage division signal (Vi) is to be in enlarging state, still reduce state, when said rectification and voltage division signal (Vi) increases; Said voltage rises or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), the offset compensation signal (Vi1) that equals to bear; When said rectification and voltage division signal (Vi) reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), equals positive offset compensation signal (Vi1);
One adder adds the above total harmonic distortion (THD) optimization signal (Ctrl) inside the output signal (Sm) of multiplier, offer the inverting input of induction by current comparator.
16., it is characterized in that said total harmonic distortion optimization device comprises like claim 12,13 or 14 said control device with Switching Power Supply of power factor correction:
One subtracter from a constant signal (A1), deducts rectification and voltage division signal (Vi) afterwards, through a weighter, produces an offset compensation signal (Vi1);
One voltage rises or the decline detector; Said voltage rising or decline detector are according to rectification and voltage division signal (Vi); Judge that said rectification and voltage division signal (Vi) is to be in enlarging state, still reduce state, when said rectification and voltage division signal (Vi) increases; Said voltage rises or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), the offset compensation signal (Vi1) that equals to bear; When said rectification and voltage division signal (Vi) reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), equals positive offset compensation signal (Vi1);
A subtracter deducts total harmonic distortion (THD) from current sampling signal (Srs) the inside and optimizes signal (Ctrl), offers the normal phase input end of induction by current comparator.
17., it is characterized in that said voltage rises or the implementation of decline detector is: said rectification and voltage division signal (Vi) is provided for the level shift module like claim 15 or 16 said control device with Switching Power Supply of power factor correction; Said level shift module produces three level shift signals: the first level shift signal (V0) equals said rectification and voltage division signal (Vi); The second level shift signal (Va) equals said rectification and voltage division signal (Vi) and adds a deviation delta; The 3rd level shift signal (Vb) equals said rectification and voltage division signal (Vi) and deducts a deviation delta, and the said second level shift signal (Va) offers the sampling comparator that descends; Said the 3rd level shift signal (Vb) offers the up-samples comparator, and the inhibit signal above the electric capacity (Vsamp) is offered said up-samples comparator and said decline sampling comparator simultaneously; Said decline sampling more said second level shift signal (Va) of comparator and said inhibit signal (Vsamp); Produce decline sampled signal (Vc) and offer rest-set flip-flop and sampling pulse generator; More described the 3rd level shift signal (Vb) of said up-samples comparator and said inhibit signal (Vsamp); Produce up-samples signal (Vd) and offer said rest-set flip-flop and said sampling pulse generator, said sampling pulse generator control switch is sampled when said switch closure; Said inhibit signal Vsamp equals the said first level shift signal (V0), just said rectification and voltage division signal (Vi); When said switch breaks off, because electric capacity exists, get into the maintenance stage, said rest-set flip-flop produces judges signal (Ve).
18., it is characterized in that said total harmonic distortion optimization device comprises like claim 12 or 13 or 14 said control device with Switching Power Supply of power factor correction:
One filter capacitor discharges and recharges analog circuit, can come the charge and discharge process of analog filtering electric capacity (Cin) according to rectification and voltage division signal (Vi) and electric capacity (C1), produces total harmonic distortion (THD) and optimizes signal (Ctrl);
One adder adds total harmonic distortion (THD) optimization signal (Ctrl) inside the output signal (Sm) of said multiplier, offer the inverting input of induction by current comparator.
19., it is characterized in that said total harmonic distortion optimization device comprises like claim 12 or 13 or 14 said control device with Switching Power Supply of power factor correction:
One filter capacitor discharges and recharges analog circuit, can come the charge and discharge process of analog filtering electric capacity (Cin) according to rectification and voltage division signal (Vi) and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal (Ctrl);
One subtracter deducts total harmonic distortion (THD) from said current sampling signal (Srs) the inside and optimizes signal (Ctrl), offers the normal phase input end of induction by current comparator.
20. like claim 18 or 19 said control device with Switching Power Supply of power factor correction; It is characterized in that the base input signal that said filter capacitor discharges and recharges the NPN pipe Q1 of analog circuit is rectification and voltage division signal (Vi); The collector electrode of the 4th NPN pipe Q1 is received power supply; The emitter of the one NPN pipe Q1 is received the constant-current source I2 of a ground connection, and the base stage of the 4th PNP pipe Q4 is received the common port of NPN pipe Q1 and constant-current source I2; The base input signal of the 2nd PNP pipe Q2 is rectification and voltage division signal Vi; The collector electrode of the 2nd PNP pipe Q2 is received ground; The emitter of the 2nd PNP pipe Q2 is received a constant-current source I1 who connects power supply, and the base stage of the 3rd NPN pipe Q3 is received the common port of the 2nd PNP pipe Q2 and constant-current source I1; The emitter of the 3rd NPN pipe Q3 links to each other with the emitter of the 4th PNP pipe Q4, receives an other end ground connection of described first capacitor C, 1, the second capacitor C 1; The collector electrode of the 3rd NPN pipe Q3 is received the input stage of the current mirror of being made up of PMOS pipe M1 and the 2nd PMOS pipe M2; The collector electrode of the 4th PNP pipe Q4 is received the input stage of the current mirror of being made up of the 3rd NMOS pipe M3 and the 4th NMOS pipe M4, and the output stage of described two current mirrors links to each other, and exports said total harmonic distortion optimization signal (Ctrl).
21. the total harmonic distortion optimization device is characterized in that comprising:
One subtracter from a constant signal (A1), deducts rectification and voltage division signal (Vi) afterwards, through a weighter, produces an offset compensation signal (Vi1);
One voltage rises or the decline detector; Said voltage rising or decline detector are according to rectification and voltage division signal (Vi); Judge that said rectification and voltage division signal (Vi) is to be in enlarging state, still reduce state, when said rectification and voltage division signal (Vi) increases; Said voltage rises or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), the offset compensation signal (Vi1) that equals to bear; When said rectification and voltage division signal Vi reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), equals positive offset compensation signal (Vi1);
One adder adds the above total harmonic distortion (THD) optimization signal (Ctrl), output then inside the output signal Sm of multiplier.
22. the total harmonic distortion optimization device is characterized in that comprising:
One subtracter from a constant signal (A1), deducts rectification and voltage division signal (Vi) afterwards, through a weighter, produces an offset compensation signal (Vi1);
One voltage rises or the decline detector; Said voltage rising or decline detector are according to rectification and voltage division signal (Vi); Judge that said rectification and voltage division signal (Vi) is to be in enlarging state, still reduce state, when said rectification and voltage division signal Vi increases; Said voltage rises or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), the offset compensation signal (Vi1) that equals to bear; When said rectification and voltage division signal (Vi) reduced, said voltage rose or the output total harmonic distortion (THD) of decline detector is optimized signal (Ctrl), equals positive offset compensation signal (Vi1);
A subtracter deducts total harmonic distortion (THD) from current sampling signal Srs the inside and optimizes signal (Ctrl), then output.
23., it is characterized in that said voltage rises or the implementation of decline detector is: said rectification and voltage division signal (Vi) is provided for the level shift module like claim 22 or 23 said total harmonic distortion optimization devices; Said level shift module produces three level shift signals: the first level shift signal (V0) equals said rectification and voltage division signal (Vi); The second level shift signal (Va) equals said rectification and voltage division signal (Vi) and adds a deviation delta; The 3rd level shift signal (Vb) equals said rectification and voltage division signal (Vi) and deducts a deviation delta, and the said second level shift signal (Va) offers the sampling comparator that descends; Said the 3rd level shift signal (Vb) offers the up-samples comparator, and the inhibit signal above the electric capacity (Vsamp) is offered said up-samples comparator and said decline sampling comparator simultaneously; Said decline sampling more said second level shift signal (Va) of comparator and said inhibit signal (Vsamp); Produce decline sampled signal (Vc) and offer rest-set flip-flop and sampling pulse generator; More described the 3rd level shift signal (Vb) of said up-samples comparator and said inhibit signal (Vsamp); Produce up-samples signal (Vd) and offer said rest-set flip-flop and said sampling pulse generator, said sampling pulse generator control switch is sampled when said switch closure; Said inhibit signal (Vsamp) equals the said first level shift signal (V0), just said rectification and voltage division signal (Vi); When said switch breaks off, because electric capacity exists, get into the maintenance stage, said rest-set flip-flop produces judges signal (Ve).
24. the total harmonic distortion optimization device is characterized in that comprising:
One filter capacitor discharges and recharges analog circuit, can come the charge and discharge process of analog filtering capacitor C in according to rectification and voltage division signal (Vi) and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal (Ctrl);
One adder adds total harmonic distortion (THD) optimization signal (Ctrl), output then inside the output signal (Sm) of said multiplier.
25. the total harmonic distortion optimization device is characterized in that comprising:
One filter capacitor discharges and recharges analog circuit, can come the charge and discharge process of analog filtering electric capacity (Cin) according to rectification and voltage division signal (Vi) and capacitor C 1, produces total harmonic distortion (THD) and optimizes signal (Ctrl);
One subtracter deducts total harmonic distortion (THD) from said current sampling signal (Srs) the inside and optimizes signal (Ctrl), then output.
26. like claim 24 or 25 said total harmonic distortion optimization devices; It is characterized in that the base input signal that said filter capacitor discharges and recharges the NPN pipe Q1 of analog circuit is rectification and voltage division signal (Vi); The collector electrode of the 4th NPN pipe Q1 is received power supply; The emitter of the one NPN pipe Q1 is received the constant-current source I2 of a ground connection, and the base stage of the 4th PNP pipe Q4 is received the common port of NPN pipe Q1 and constant-current source I2; The base input signal of the 2nd PNP pipe Q2 is rectification and voltage division signal Vi; The collector electrode of the 2nd PNP pipe Q2 is received ground; The emitter of the 2nd PNP pipe Q2 is received a constant-current source I1 who connects power supply, and the base stage of the 3rd NPN pipe Q3 is received the common port of the 2nd PNP pipe Q2 and constant-current source I1; The emitter of the 3rd NPN pipe Q3 links to each other with the emitter of the 4th PNP pipe Q4, receives an other end ground connection of described first capacitor C, 1, the second capacitor C 1; The collector electrode of the 3rd NPN pipe Q3 is received the input stage of the current mirror of being made up of PMOS pipe M1 and the 2nd PMOS pipe M2; The collector electrode of the 4th PNP pipe Q4 is received the input stage of the current mirror of being made up of the 3rd NMOS pipe M3 and the 4th NMOS pipe M4, and the output stage of described two current mirrors links to each other, and exports said total harmonic distortion optimization signal (Ctrl).
27. have the control method of the Switching Power Supply of power factor correction, it is characterized in that:
Step 1, ac input signal converts direct-flow output signal to;
Step 2 compares the said direct-flow output signal and first reference signal, produces an error amplification signal;
Step 3, said error amplification signal and said ac input signal multiplied each other produces a product signal;
Step 4 compares said product signal and sampled signal, when said sampled signal is equal to or greater than said product signal, produces a power tube cut-off signals, stops from the inductance absorption current;
Step 5 compares the detection signal and second reference signal, when said detection signal is equal to or less than said second reference signal, produces a power tube Continuity signal, begins from said inductance absorption current;
When ac input signal increases, reduce the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor charging; When ac input signal reduces, increase the peak current of said inductance, the compensation AC network is to the electric current of said filter capacitor discharge.
28., it is characterized in that like the said method of claim 27:
It is the voltage that the electric current of said power tube produces on sampling resistor that said sampled signal is represented current sampling signal;
On behalf of coupling coil, said detection signal detect the zero current condition of said inductance.
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| CN113452269A (en) * | 2021-04-20 | 2021-09-28 | 成都芯源系统有限公司 | Switching power supply circuit and method |
| CN114094849A (en) * | 2020-08-24 | 2022-02-25 | 宏碁股份有限公司 | Power converters and associated power factor correction circuits with improved zero-crossover distortion |
| CN114421744A (en) * | 2022-01-27 | 2022-04-29 | 杭州士兰微电子股份有限公司 | Power converter and control circuit and control method thereof |
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