CN100527580C - Power conversion device utilizing the front feedback voltage compensation and its method - Google Patents
Power conversion device utilizing the front feedback voltage compensation and its method Download PDFInfo
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- CN100527580C CN100527580C CNB2006100060205A CN200610006020A CN100527580C CN 100527580 C CN100527580 C CN 100527580C CN B2006100060205 A CNB2006100060205 A CN B2006100060205A CN 200610006020 A CN200610006020 A CN 200610006020A CN 100527580 C CN100527580 C CN 100527580C
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Abstract
A kind of power supply transforming device and method which uses feedforward voltage compensation to start power factor emendation circuit, the voltage-dividing unit and feedback unit are used to gain the compensation voltage which are proportional to the input voltage and output voltage, the feedback voltage is compensated with the compensation voltage by calculating unit, and the comparison unit starts the PFC circuit within the preset input power range based on the feedback voltage accomplished. Whatever the input voltage changes, before the input power reaches 75W, the PFC circuit can be started.
Description
Technical field
The present invention relates to a kind of front feedback voltage compensation that utilizes to enable power factor correction (Power FactorCorrection, abbreviation PFC) power supply change-over device and the method thereof of circuit, relate in particular to and a kind ofly can under identical input power condition, enable the power supply change-over device and the method for pfc circuit.
Background technology
According to the international standard of IEC1000-3-2, the power supply change-over device with pfc circuit need be enabled pfc circuit with the program of boosting before input power reaches 75W.In order to reach purpose of power saving, under the underloading condition, the pfc circuit of must stopping using of the power supply change-over device with pfc circuit.And in power supply change-over device, use pfc circuit to be technique known, be used for reducing the current harmonics of power supply change-over device power end, and then make the power factor of power supply change-over device input power supply be close to 1, and pfc circuit has boost function.
With reference to figure 1, known circuit diagram with power supply change-over device of pfc circuit.Power supply change-over device 1 includes pfc circuit 10, power conversion unit 20, feedback unit 30 and comparing unit 40.Pfc circuit 10 includes PFC transducer 102, pfc controller 104 and bus capacitance C
B Power conversion unit 20 includes PWM transducer 202 and PWM controller 204.
Input voltage V
INPfc controller 104 control PFC transducers 102 by pfc circuit 10 carry out the power factor correction and the program of boosting, and at bus capacitance C
BOn set up bus voltage V
BUS, power conversion unit 20 passes through PWM transducer 202 with bus voltage V
BUSConvert output voltage V to
OUTUse to offer load.
With reference to figure 1, feedback unit 30 is obtained the feedback voltage V that is directly proportional with load from the load end of power conversion unit 20 again
FB, this feedback voltage V
FBSize be directly proportional with load.Feedback voltage V under the heavy duty
FBLevel is higher, the feedback voltage V under the underloading
FBLevel is lower.At the output of power supply change-over device 1, when load increases to heavy duty gradually by underloading, feedback voltage V
FBIncrease.The input power of power supply change-over device 1 can increase and increase along with load, and according to the requirement of international standard IEC1000-3-2, the input power of power supply change-over device 1 is before arriving 75W, and power supply change-over device 1 must be enabled pfc circuit 10.
Comparing unit 40 negative terminals receive reference voltage V
TIts anode then receives feedback voltage V
FBWherein comparing unit 40 can be realized by hysteresis comparator.Therefore prescribe a time limit greater than going up of comparing unit 40 magnetic hysteresis scopes when the load of power supply change-over device 1, comparing unit 40 is sent the control signal S of high level
C, and then make pfc controller 104 transmit the power factor drive signal S of high level
PFCTo PFC transducer 102, make the PFC transducer 102 starting power factor correctings and the program of boosting.Be stored in bus capacitance C this moment
BInput voltage V
INMoment is promoted to very high DC level, and feedback voltage V
FBRelatively descend.When the load minimizing of power supply change-over device 1, feedback voltage V
FBBe reduced to the following of comparing unit 40 magnetic hysteresis scopes and prescribe a time limit, comparing unit 40 is sent low level control signal S
C, and then make pfc controller 104 transmit low level power factor drive signal S
PFCTo PFC transducer 102, make PFC transducer 102 stop power factor correction and the program of boosting.
With reference to figure 1, when the power switch Q conducting in the power conversion unit 20, be stored in the magnetizing inductance L on the transformer T again
POn energy W
INCan be expressed as:
Flow through the switch current I of transformer T primary side
PCan be expressed as:
Under normal load, feedback voltage V
FBCan influence the switch current I of transformer T primary side
PAnd switch current I
PSize relevant with load, so the size of load is proportional to feedback voltage V
FBSo heavy duty down, power output improves relatively, feedback voltage V
FBLevel is higher, under the underloading power output and feedback voltage V
FBLevel is lower.
Equation (2) substitution (1) can obtain maximal input P
IN:
The t among the equation (1) to (3) wherein
OnDuring for power switch Q conducting, pulse-width control signal V
PWMON time; T
SBe pulse-width control signal V
PWMSwitching cycle.
Known power supply change-over device 1 passes through feedback voltage V
FBAnd the magnetic hysteresis scope of comparing unit 40 control pfc circuit 10 carries out the power factor correction and the program of boosting.Work as feedback voltage V
FBRise to going up in limited time of magnetic hysteresis scope, pfc circuit 10 carries out the power factor correction and the program of boosting; Work as feedback voltage V
FBDrop to the following of magnetic hysteresis scope and prescribe a time limit, pfc circuit 10 stops power factor correction and the program of boosting.Because input voltage V
INHigher (V
H) time, feedback voltage V
FBLevel is lower, so power supply change-over device is through the input power of being everlasting during greater than 75W, and pfc circuit 10 just can the starting power factor correcting and the program of boosting.
With reference to figure 2, known when enabling pfc circuit, the input voltage of power supply change-over device 1 and input power concern the coordinate schematic diagram.Learn power supply change-over device 1 input power P by equation (3)
INWith input voltage V
INSquare be directly proportional.Therefore load is heavy more, input voltage V
INHigh more (V
H), power supply change-over device 1 will reach bigger input power P
INHCould control pfc circuit 10 and start the program of boosting.
Therefore, known power supply change-over device 1 is at high input voltage V
HUnder the condition of (greater than 180Vac) and load heavier (greater than 150W), input power just can be enabled pfc circuit 10, and not meet the requirement of international standard IEC1000-3-2 during greater than 75W.
Summary of the invention
Therefore, the invention provides a kind of power supply change-over device and the method for front feedback voltage compensation of utilizing to enable pfc circuit, utilize feedback voltage and input voltage to have complementary change relation, when making power supply change-over device receive different input voltages, can both before reaching 75W, input power enable the power factor correction of pfc circuit and the program of boosting.
Power supply change-over device of the present invention includes: pfc circuit, power conversion unit, feedback unit, partial pressure unit, arithmetic element and comparing unit.Wherein pfc circuit receives input voltage, output bus voltage.Power conversion unit receives bus voltage, the output output voltage.Feedback unit obtains this output voltage and produces feedback voltage.Partial pressure unit receives this input voltage, the output bucking voltage.Arithmetic element collocation comparing unit carries out computing to feedback voltage, this bucking voltage and reference voltage, and to produce control signal, control signal is controlled this pfc circuit and enabled power factor correction and the program of boosting.
As the first kind of technical scheme that realizes that the present invention conceives substantially, wherein arithmetic element is coupled to this feedback unit and this partial pressure unit, this arithmetic element add up this feedback voltage and this bucking voltage, and export first critical voltage; And
Comparing unit, be coupled to this arithmetic element and this circuit of power factor correction, this comparing unit receives this first critical voltage and reference voltage, when this first critical voltage during greater than this reference voltage, this comparing unit output control signal, but this this circuit of power factor correction of control signal activation with so that this circuit of power factor correction starting power factor correcting and the program of boosting, thereby carries out power factor correction and boosts this input voltage.
To enable the power supply change-over device of circuit of power factor correction, wherein this circuit of power factor correction includes according to the described front feedback voltage compensation that utilizes:
Power factor correction controller is connected to this comparing unit, receives this control signal, in order to the output power factor drive signal;
Power factor correction converter, be coupled to this power factor correction controller, this power factor correction converter is controlled by this power factor drive signal, when this power factor drive signal is activation, becomes this bus voltage in order to enable power factor correction with this input voltage boosted; And
Bus capacitance is coupled to this power factor correction converter, receives and temporary this bus voltage.
According to the described front feedback voltage compensation that utilizes to enable the power supply change-over device of circuit of power factor correction, wherein this comparing unit is the magnetic hysteresis comparing unit, this magnetic hysteresis comparing unit provides a magnetic hysteresis scope according to this reference voltage, this comparing unit is this magnetic hysteresis scope and this first critical voltage relatively, in order to export this control signal.
As the second kind of technical scheme that realizes that the present invention conceives substantially, wherein arithmetic element is coupled to this partial pressure unit and reference voltage, is used for this reference voltage is deducted this bucking voltage, and exports second critical voltage; And
Comparing unit, be coupled to this arithmetic element, this circuit of power factor correction and this feedback unit, this comparing unit receives this second critical voltage and this feedback voltage, when this feedback voltage during greater than this second critical voltage, this comparing unit output control signal, but this this circuit of power factor correction of control signal activation with so that this circuit of power factor correction starting power factor correcting and the program of boosting, thereby carries out power factor correction and boosts this input voltage.
To enable the power supply change-over device of circuit of power factor correction, wherein this circuit of power factor correction includes according to the described front feedback voltage compensation that utilizes:
Power factor correction controller is connected in this comparing unit, receives this control signal, in order to the output power factor drive signal;
Power factor correction converter, be coupled to this power factor correction controller, this power factor correction converter is controlled by this power factor drive signal, but when this power factor drive signal is activation, becomes this bus voltage in order to enable power factor correction with this input voltage boosted; And
Bus capacitance is coupled to this power factor correction converter, receives and temporary this bus voltage.
According to the described front feedback voltage compensation that utilizes to enable the power supply change-over device of circuit of power factor correction, wherein this comparing unit is the magnetic hysteresis comparing unit, this magnetic hysteresis comparing unit provides a magnetic hysteresis scope according to this second critical voltage, this comparing unit is this magnetic hysteresis scope and this feedback voltage relatively, in order to export this control signal.
In addition, the present invention also provides a kind of front feedback voltage compensation that utilizes to enable the method for pfc circuit, and its step is as follows: at first obtain bucking voltage from the input voltage dividing potential drop, obtain the feedback voltage with the output voltage equal proportion simultaneously; Reference voltage is provided then; Then this reference voltage, this bucking voltage and this feedback voltage are carried out computing, to produce control signal; Next according to this control signal control pfc circuit, before reaching 75W, input power carries out the power factor correction and the program of boosting.
, wherein this reference voltage, this bucking voltage and this feedback voltage are carried out including in the step of computing to enable the method for circuit of power factor correction according to the described front feedback voltage compensation that utilizes:
Use this bucking voltage to add this feedback voltage, to produce first critical voltage; And
Relatively this reference voltage and this first critical voltage are to produce this control signal.
According to the described front feedback voltage compensation that utilizes to enable the method for circuit of power factor correction, wherein relatively in the step of this reference voltage and this first critical voltage, this reference voltage provides a magnetic hysteresis scope, when this first critical voltage going up in limited time greater than this magnetic hysteresis scope, this control signal is enabled the power factor correction of this circuit of power factor correction and the program of boosting, prescribe a time limit less than the following of this magnetic hysteresis scope when this control voltage again, this control signal is closed the power factor correction of this circuit of power factor correction and the program of boosting.
, wherein this reference voltage, this bucking voltage and this feedback voltage are carried out including in the step of computing to enable the method for circuit of power factor correction according to the described front feedback voltage compensation that utilizes:
Use this reference voltage to deduct this bucking voltage, to produce second critical voltage; And
Relatively this feedback voltage and this second critical voltage are to produce this control signal.
According to the described front feedback voltage compensation that utilizes to enable the method for circuit of power factor correction, wherein relatively in the step of this feedback voltage and this second critical voltage, this second critical voltage provides a magnetic hysteresis scope, when this feedback voltage going up in limited time greater than this magnetic hysteresis scope, this control signal is enabled the power factor correction of this circuit of power factor correction and the program of boosting, prescribe a time limit less than the following of this magnetic hysteresis scope when this feedback voltage again, this control signal is closed the power factor correction of this circuit of power factor correction and the program of boosting.
The invention provides a kind of front feedback voltage compensation that utilizes to enable the method for circuit of power factor correction, step includes: obtain bucking voltage from the input voltage dividing potential drop; Obtain feedback voltage from the output voltage feedback; Reference voltage is provided; This bucking voltage is added this feedback voltage, to produce first critical voltage; Relatively this reference voltage and this first critical voltage are to produce control signal; And this control signal makes this circuit of power factor correction starting power factor correcting and the program of boosting, thereby this input voltage is carried out power factor correction and boosts.
The present invention also provides a kind of front feedback voltage compensation that utilizes to enable the method for circuit of power factor correction, it is characterized in that step includes: obtain bucking voltage from the input voltage dividing potential drop; Obtain feedback voltage from the output voltage feedback; Reference voltage is provided; Use this reference voltage to deduct this bucking voltage, to produce second critical voltage; Relatively this feedback voltage and this second critical voltage are to produce this control signal; And this control signal makes this circuit of power factor correction starting power factor correcting and the program of boosting, thereby this input voltage is carried out power factor correction and boosts.
Power supply change-over device of the present invention can improve under different input voltages by the method for front feedback voltage compensation, enables the PFC transducer and produces the excessive shortcoming of input power difference.And this kind compensation method allows power supply change-over device under load heavier (greater than 150W) and high input voltage (greater than 180Vac), can enable pfc circuit before input power is greater than 75W, to meet the requirement of international standard.
Above general introduction and ensuing detailed description are all exemplary in nature, are in order to further specify claim of the present invention.And about other purpose of the present invention and advantage, will in follow-up explanation and accompanying drawing, be set forth.
Description of drawings
Fig. 1 is known circuit diagram with power supply change-over device of pfc circuit;
Fig. 2 is for known when enabling pfc circuit, the coordinate schematic diagram of the input voltage of power supply change-over device and the relation of input power;
Fig. 3 is the circuit diagram of the present invention's first preferred embodiment;
Fig. 4 is the circuit diagram of the present invention's second preferred embodiment; And
When Fig. 5 enables pfc circuit for the present invention, the coordinate schematic diagram of the input voltage of power supply change-over device and the relation of input power.
Wherein, description of reference numerals is as follows:
Known:
Power supply change-over device 1 pfc circuit 10
PFC transducer 102 pfc controllers 104
Comparing unit 40
The present invention:
Power supply change-over device 2 pfc circuits 10
Comparing unit 40 partial pressure unit 50
Power supply change-over device 2a bus capacitance C
B
Embodiment
With reference to figure 3, the circuit diagram of the present invention's first preferred embodiment.Power supply change-over device 2 of the present invention includes pfc circuit 10, power conversion unit 20, feedback unit 30, partial pressure unit 50, arithmetic element 60 and comparing unit 40.PFC unit 10 receives input voltage V
INAnd output bus voltage V
BUSIn pfc circuit 10, pfc controller 104 is controlled by the control signal S of comparing unit 40 outputs
CIn this control signal S
CDuring activation, the power factor drive signal S of these pfc controller 104 output high level
PFCTo PFC transducer 102, in order to control 102 pairs of these input voltages of this PFC transducer V
INCarry out power factor correction and boost, and at bus capacitance C
BLast foundation and input voltage V
INThe bus voltage V of equal proportion
BUS Power conversion unit 20 is by the pulse-width control signal V of its inner PWM controller 204 outputs
PWMPower controlling switch Q switches, and makes PWM transducer 202 with bus voltage V
BUSBe converted to output voltage V
OUT
Comparing unit 40 concatenation operation unit 60.The output of comparing unit 40 anode concatenation operation unit 60 is in order to receive the first critical voltage V
CNegative terminal connects reference voltage V
TComparing unit 40 comparison operation reference voltage V
TWith the first critical voltage V
C, as the first critical voltage V
CGreater than reference voltage V
TThe time, comparing unit 40 output control signal S
C, this control signal S
CBut this pfc circuit 10 of activation is in order to enable power factor correction and to boost program.Consider under the actual circuit application that comparing unit 40 can utilize hysteresis comparator to realize, makes reference voltage V
THas the magnetic hysteresis scope.
According to the above description, power supply change-over device 2 is under the condition of identical input power, as input voltage V
INWhen higher, bucking voltage V
RMSBigger, but reference voltage V
TConstant, carry out the first critical voltage V that add operation produces by arithmetic element 60
CHigher, therefore only need less feedback voltage V
FBJust can reach the upper limit of the magnetic hysteresis scope of comparing unit 40, comparing unit 40 basis and feedback voltage V
FBThe first relevant critical voltage V
C, output can make this pfc circuit 102 carry out the control signal S of the power factor correction and the program of boosting
CAs input voltage V
INWhen low, bucking voltage V
RMSLower, bigger feedback voltage V
FBJust can reach the upper limit of the magnetic hysteresis scope of comparing unit 40, make pfc circuit 102 carry out the power factor correction and the program of boosting.As the first critical voltage V
CDuring less than the low level of magnetic hysteresis scope, the control signal S of comparing unit 40 outputs
CMake PFC transducer 102 stop power factor correction and the program of boosting.
Cooperate Fig. 3, please refer to Fig. 5, when the present invention enables pfc circuit, the input voltage of power supply change-over device and input power concern the coordinate schematic diagram.The present invention utilizes bucking voltage V
RMSCompensation Feedback voltage V
FB, so the first critical voltage V of arithmetic element 60 outputs
CCan keep a stable scope, make high input voltage V
HEnable the boost input power P of program of PFC transducer 102
INHWith low input V
LEnable the boost input power P of program of PFC transducer 102
INLThe meeting approximately equal is improved known technology at high input voltage V
INCan't before reaching 75W, input power enable the shortcoming that pfc circuit 10 carries out the power factor correction and the program of boosting down.
Cooperate Fig. 3, please refer to Fig. 4, the circuit diagram of the present invention's second preferred embodiment.Second preferred embodiment and the main difference of first preferred embodiment are that arithmetic element is to realize with subtracter in second preferred embodiment.Arithmetic element 60a, comparing unit 40, and feedback unit 30 between the annexation slight change.In second preferred embodiment, arithmetic element 60a couples partial pressure unit 50 and receives bucking voltage V
RMSWith reference voltage V
T, and export the second critical voltage V
THTo set up comparing unit 40 magnetic hysteresis scopes.This second critical voltage V
THGet reference voltage V
TWith bucking voltage V
RMSDifference.
The negative terminal of comparing unit 40 couples arithmetic element 60a to receive the second critical voltage V
TH, its anode couples feedback unit 30 to receive feedback voltage V
FBWork as feedback voltage V
FBDuring greater than the high level of the magnetic hysteresis scope of comparing unit 40, control signal S
CEnable the power factor correction of this pfc circuit 10 and the program of boosting; When this feedback voltage V
FBDuring less than the low level of magnetic hysteresis scope, control signal S
CClose the power factor correction of this pfc circuit 10 and the program of boosting.
With reference to figure 4, power supply change-over device 2a is under the condition of identical input power, as high input voltage V again
HThe time, bucking voltage V
RMSBigger, reference voltage V
TConstant, carry out the second critical voltage V that subtraction produces by arithmetic element 60a
THLess, therefore only need less feedback voltage V
FBJust can reach the upper limit of the magnetic hysteresis scope of comparing unit 40.Comparing unit 40 basis and feedback voltage V
FBThe second relevant critical voltage V
TH, output can make this pfc circuit 102 carry out the control signal S of the power factor correction and the program of boosting
CAs low input V
LThe time, bucking voltage V
RMSLess, reference voltage V
TConstant, carry out the second critical voltage V that subtraction produces by arithmetic element 60a
THIncrease, need bigger feedback voltage V
FB just can reach the upper limit of the magnetic hysteresis scope of comparing unit 40, makes pfc circuit 102 carry out the power factor correction and the program of boosting.
Therefore, power supply change-over device of the present invention can improve at different input voltage V by the method for front feedback voltage compensation
INEnable the PFC transducer 102 input power P that produces down,
INThe shortcoming that difference is excessive.And this kind compensation method allows power supply change-over device under load heavier (greater than 150W) and high input voltage (greater than 180Vac), can enable pfc circuit before input power is greater than 75W, to meet the requirement of international standard.
The above; only be the detailed description and the accompanying drawing of the specific embodiment of one of the best of the present invention; those skilled in the art is under the situation that does not break away from the disclosed scope and spirit of claims of the present invention, and change of being done and modification all belong within the scope of patent protection of the present invention.
Claims (10)
1. one kind is utilized front feedback voltage compensation to enable the power supply change-over device of circuit of power factor correction, it is characterized in that, includes:
Circuit of power factor correction receives input voltage, and output bus voltage;
Power conversion unit is coupled to this circuit of power factor correction, and this power conversion unit receives this bus voltage, and exports an output voltage;
Feedback unit is coupled to this power conversion unit, and this feedback unit produces feedback voltage according to this output voltage;
Partial pressure unit receives this input voltage, and the output bucking voltage;
Arithmetic element is coupled to this feedback unit and this partial pressure unit, this arithmetic element add up this feedback voltage and this bucking voltage, and export first critical voltage; And
Comparing unit, be coupled to this arithmetic element and this circuit of power factor correction, this comparing unit receives this first critical voltage and a reference voltage, when this first critical voltage during greater than this reference voltage, this comparing unit output control signal, this control signal can this circuit of power factor correction of activation, with so that this circuit of power factor correction starting power factor correcting with boost program, thereby this input voltage is carried out power factor correction and boosts.
2. the front feedback voltage compensation that utilizes as claimed in claim 1 is characterized in that to enable the power supply change-over device of circuit of power factor correction this circuit of power factor correction includes:
Power factor correction controller is connected to this comparing unit, receives this control signal, in order to the output power factor drive signal;
Power factor correction converter, be coupled to this power factor correction controller, this power factor correction converter is controlled by this power factor drive signal, when this power factor drive signal is activation, becomes this bus voltage in order to enable power factor correction with this input voltage boosted; And
Bus capacitance is coupled to this power factor correction converter, receives and temporary this bus voltage.
3. the front feedback voltage compensation that utilizes as claimed in claim 1 is to enable the power supply change-over device of circuit of power factor correction, it is characterized in that: this comparing unit is the magnetic hysteresis comparing unit, this magnetic hysteresis comparing unit provides a magnetic hysteresis scope according to this reference voltage, this comparing unit is this magnetic hysteresis scope and this first critical voltage relatively, in order to export this control signal.
4. one kind is utilized front feedback voltage compensation to enable the power supply change-over device of circuit of power factor correction, it is characterized in that, includes:
Circuit of power factor correction receives input voltage, and output bus voltage;
Power conversion unit is coupled to this circuit of power factor correction, and this power conversion unit receives this bus voltage, and exports an output voltage;
Feedback unit is coupled to this power conversion unit, and this feedback unit produces feedback voltage according to this output voltage;
Partial pressure unit receives this input voltage, and the output bucking voltage;
Arithmetic element is coupled to this partial pressure unit and a reference voltage, is used for this reference voltage is deducted this bucking voltage, and exports second critical voltage; And
Comparing unit, be coupled to this arithmetic element, this circuit of power factor correction and this feedback unit, this comparing unit receives this second critical voltage and this feedback voltage, when this feedback voltage during greater than this second critical voltage, this comparing unit output control signal, this control signal can this circuit of power factor correction of activation, with so that this circuit of power factor correction starting power factor correcting with boost program, thereby this input voltage is carried out power factor correction and boosts.
5. the front feedback voltage compensation that utilizes as claimed in claim 4 is characterized in that to enable the power supply change-over device of circuit of power factor correction this circuit of power factor correction includes:
Power factor correction controller is connected in this comparing unit, receives this control signal, in order to the output power factor drive signal;
Power factor correction converter, be coupled to this power factor correction controller, this power factor correction converter is controlled by this power factor drive signal, when this power factor drive signal is activation, becomes this bus voltage in order to enable power factor correction with this input voltage boosted; And
Bus capacitance is coupled to this power factor correction converter, receives and temporary this bus voltage.
6. the front feedback voltage compensation that utilizes as claimed in claim 4 is to enable the power supply change-over device of circuit of power factor correction, it is characterized in that: this comparing unit is the magnetic hysteresis comparing unit, this magnetic hysteresis comparing unit provides a magnetic hysteresis scope according to this second critical voltage, this comparing unit is this magnetic hysteresis scope and this feedback voltage relatively, in order to export this control signal.
7. one kind is utilized front feedback voltage compensation to enable the method for circuit of power factor correction, it is characterized in that step includes:
Obtain bucking voltage from the input voltage dividing potential drop;
Obtain feedback voltage from the output voltage feedback;
Reference voltage is provided;
This bucking voltage is added this feedback voltage, to produce first critical voltage;
Relatively this reference voltage and this first critical voltage are to produce control signal; And
This control signal makes this circuit of power factor correction starting power factor correcting and boosts program, thereby this input voltage is carried out power factor correction and boosts.
8. the front feedback voltage compensation that utilizes as claimed in claim 7 is to enable the method for circuit of power factor correction, it is characterized in that: relatively in the step of this reference voltage and this first critical voltage, this reference voltage provides a magnetic hysteresis scope, when this first critical voltage going up in limited time greater than this magnetic hysteresis scope, this control signal makes this circuit of power factor correction starting power factor correcting and boosts program, thereby this input voltage is carried out power factor correction and boosts, controlling voltage when this again prescribes a time limit less than the following of this magnetic hysteresis scope, this control signal makes the power factor correction out of service of this circuit of power factor correction and boosts program, thereby stops this input voltage is carried out power factor correction and boosts.
9. one kind is utilized front feedback voltage compensation to enable the method for circuit of power factor correction, it is characterized in that step includes:
Obtain bucking voltage from the input voltage dividing potential drop;
Obtain feedback voltage from the output voltage feedback;
Reference voltage is provided;
Use this reference voltage to deduct this bucking voltage, to produce second critical voltage;
Relatively this feedback voltage and this second critical voltage are to produce this control signal; And
This control signal makes this circuit of power factor correction starting power factor correcting and boosts program, thereby this input voltage is carried out power factor correction and boosts.
10. the front feedback voltage compensation that utilizes as claimed in claim 9 is to enable the method for circuit of power factor correction, it is characterized in that: relatively in the step of this feedback voltage and this second critical voltage, this second critical voltage provides a magnetic hysteresis scope, when this feedback voltage going up in limited time greater than this magnetic hysteresis scope, this control signal makes this circuit of power factor correction starting power factor correcting and boosts program, thereby this input voltage is carried out power factor correction and boosts, working as this feedback voltage again prescribes a time limit less than the following of this magnetic hysteresis scope, this control signal makes the power factor correction out of service of this circuit of power factor correction and boosts program, thereby stops this input voltage is carried out power factor correction and boosts.
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| CNB2006100060205A CN100527580C (en) | 2006-01-23 | 2006-01-23 | Power conversion device utilizing the front feedback voltage compensation and its method |
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| CNB2006100060205A CN100527580C (en) | 2006-01-23 | 2006-01-23 | Power conversion device utilizing the front feedback voltage compensation and its method |
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| CN103023300B (en) | 2011-09-26 | 2015-03-18 | 英飞特电子（杭州）股份有限公司 | Constant-current control circuit capable of correcting power factors and power factor correcting circuit |
| CN104106203B (en) * | 2012-02-17 | 2017-09-29 | 瑞典爱立信有限公司 | The electric voltage feed forward compensation and Voltage Feedback compensation of switched-mode power supply |
| US9866133B2 (en) * | 2014-01-10 | 2018-01-09 | Astec International Limited | Control circuits and methods for regulating output voltages using multiple and/or adjustable reference voltages |
| TWI599870B (en) | 2016-03-25 | 2017-09-21 | 威盛電子股份有限公司 | Operation system and control method thereof |
| US11223289B2 (en) | 2020-01-17 | 2022-01-11 | Astec International Limited | Regulated switched mode power supplies having adjustable output voltages |
| CN118523619A (en) * | 2023-12-29 | 2024-08-20 | 宁波江北博通电子有限公司 | Constant-voltage-difference boosting circuit, control method, electronic equipment and vehicle |
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2006
- 2006-01-23 CN CNB2006100060205A patent/CN100527580C/en not_active Expired - Fee Related
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| CN101009468A (en) | 2007-08-01 |
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