CN101814825A - Linear-regulated PFC (Power Factor Correction) control circuit and control method - Google Patents
Linear-regulated PFC (Power Factor Correction) control circuit and control method Download PDFInfo
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- CN101814825A CN101814825A CN201010148686A CN201010148686A CN101814825A CN 101814825 A CN101814825 A CN 101814825A CN 201010148686 A CN201010148686 A CN 201010148686A CN 201010148686 A CN201010148686 A CN 201010148686A CN 101814825 A CN101814825 A CN 101814825A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a linear-regulated PFC control circuit which comprises a PFC input voltage sampling module, a PFC input current sampling module, a PFC output voltage sampling module, a PFC control circuit module, a PFC output voltage-boosting power circuit module and a PFC linear regulation module, wherein the PFC linear regulation module is used for generating a linear regulation parameter of the linear regulation for the current loop control executed by the PFC control circuit module within the range from a heavy load to a light load according to the input current sampled by the PFC input current sampling module, and the PFC control circuit module is used for generating a wave generating signal of the linear regulation control for the PFC output voltage-boosting power circuit module according to the linear regulation parameter. An inner loop parameter is linearly regulated by utilizing the size of the load or the input current to finish effective wave shape control and obtain index optimization within a full-load range, and meanwhile, the overall efficiency within the light-load range is improved and the reactive power loss is reduced.
Description
Technical field
The present invention relates to power supply or distribution technique, particularly PFC (power factor correction) control circuit and the control method of band linear regulation.
Background technology
The efficient of improving power electronic equipment plays crucial effects to improving utilization rate of electrical, in the power electronics current converter, the input rectifying device has accounted for more than 80%, and great majority have adopted phase control rectifier, power factor is low, inject a large amount of high order harmonic components to electrical network, wasted electric energy, promptly usually said electric power public hazards.In order to reduce the harmonic pollution that nonlinear-load produces AC network, generally more and more stricter limitation standard has been proposed for the input harmonic current of switch power supply equipment both at home and abroad.The widespread usage of large power, electrically source apparatus particularly, except proposing the higher input pointer requirement to system is fully loaded, under the condition of lighter load, also require supply unit to have higher power factor and less Harmonics of Input, to reduce under the various conditions of work power electronic equipment to the pollution of electrical network, power-efficient in the time of simultaneously also can further improving underloading, because the electric device in the practical application can full-load run, the input pointer and the efficient that therefore improve underloading have realistic meanings more.
The active power factor technology of Shi Yonging mostly is the hardware integrated circuit and realizes its control mode traditionally, be subjected to the influence of its peripheral hardware circuit, often finish the parameter curing of control circuit, so system is difficult to adapt to different load capacities at a certain fixing controlling object.Cause fully loaded higher input pointer being arranged, and index will be quickened to worsen little load the time.
PFC digital control technology commonly used is at present still continued to use traditional control device, only consider the input performance index under the rated condition, can not realize the performance improvement of full-load range, particularly the pid control parameter in the control device all is to consider maximum load capacity, and parameter is in a single day fixing just can not to be changed.Part proposes to utilize judges that the load weight carries out the mode that ripple switches of sending out of PWM, at first it defines the application scenario, its main purpose is to switch different controlling schemes and then cause switching PWM to send out ripple in addition, and this control strategy will inevitably cause causing the disturbance to controller in handoff procedure.The grade that the interruption of load is switched is many more, and needed switch controller is also just many more, has wasted ample resources.
Because electric current is more little needs stronger control dynamics more, but the ovennodulation of same control dynamics can cause heavy duty again the time, therefore there is the low problem of system reliability in the fixing PFC digital control technology of existing adjusting parameter.
Summary of the invention
The purpose of this invention is to provide a kind of PFC control circuit with linear regulation, by the low problem of linear regulation resolution system reliability, input performance index problem when particularly solving in the supply unit pfc circuit underloading.
Another object of the present invention provides a kind of PFC control method with linear regulation, by the low problem of linear regulation resolution system reliability, and input performance index problem when particularly solving in the supply unit pfc circuit underloading.
According to first aspect present invention, the PFC control circuit of a kind of linear regulation of the present invention comprises:
PFC input voltage sampling module is used for from input power supply sampling input voltage V
IN
PFC input current sampling module is used for from input power supply sampling input current I
IN
PFC output voltage sampling module is used for from out-put supply sampling and outputting voltage V
OUT
The PFC control circuit module is used for the input voltage V according to PFC input voltage sampling module, PFC input current sampling module and the sampling of PFC output voltage sampling module
IN, input current I
INAnd output voltage V
OUT, generate and send out ripple signal V
D
PFC output boost power circuit module is used for according to described ripple signal V
D, to the input power supply carry out power factor correction and boost the processing after, obtain described out-put supply;
PFC linear regulation module is used for utilizing sampling input current I
IN, be created on linear regulation is carried out in heavy duty to the interior current loop control that described PFC control circuit module is carried out of underloading scope linear regulation parameter;
Wherein, by the current loop control of PFC control circuit module being carried out linear regulation, make a ripple signal V of its generation with the linear regulation parameter
DCan export the boost power circuit module to PFC and carry out linear regulation control.
Wherein, described PFC linear regulation device module comprises:
The current limit unit is used for input current I
INCarry out amplitude limit;
The linear regulation parameter generating unit is used for the basis input current and the fixing coefficient of amplitude limit, generates the linear regulation parameter.
According to second aspect present invention, the PFC control method of a kind of linear regulation of the present invention may further comprise the steps:
From input power supply sampling input voltage V
INWith input current I
IN, and from out-put supply sampling and outputting voltage V
OUT
Utilize the input current I of sampling
INThe linear regulation parameter of generation in from heavy duty to the underloading scope;
Input voltage V according to sampling
IN, input current I
IN, output voltage V
OUTAnd the linear regulation parameter, generation is used for to the power factor correction of input power supply and boosts carrying out a ripple signal V of linear regulation control
DAnd
By with described ripple signal V
DLinear regulation is carried out in the power factor correction and boosting of input power supply control, obtain out-put supply.
Wherein, the step that generates described linear regulation parameter comprises: to input current I
INCarry out amplitude limit; Input current and fixing coefficient according to amplitude limit generate the linear regulation parameter.
Technique effect of the present invention is can utilize the size of load or input current, ring parameter in adjusting linearly, thereby finish effective Waveform Control, obtain the index optimization in the full-load range, the overall efficiency when also having improved underload has simultaneously reduced reactive loss.
The present invention is described in detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram of the PFC control circuit of linear regulation of the present invention;
Fig. 2 is the schematic diagram of the PFC control circuit module among Fig. 1;
Fig. 3 a is the schematic diagram of PFC linear regulation device module among Fig. 1;
Fig. 3 b is the schematic diagram of PFC linear regulation device module first embodiment shown in Fig. 3 a;
Fig. 3 c is the schematic diagram of PFC linear regulation device module second embodiment shown in Fig. 3 a;
Fig. 4 is the software flow pattern that generates the dynamic proportion coefficient.
Embodiment
Fig. 1 has shown the PFC control circuit of a kind of linear regulation of the present invention, and this PFC control circuit is realized power factor correction by Voltage loop control and current loop control.
The PFC control circuit of linear regulation shown in Figure 1 comprises:
PFC input voltage sampling module 5 is used for from input power supply sampling input voltage V
IN
PFC input current sampling module 1 is used for from input power supply sampling input current I
IN
PFC output voltage sampling module 6 is used for from out-put supply sampling and outputting voltage V
OUT
PFC control circuit module 3 is used for the input voltage V according to PFC input voltage sampling module 5, PFC input current sampling module 1 and 6 samplings of PFC output voltage sampling module
IN, input current I
INAnd output voltage V
OUT, generate and send out ripple signal V
D
PFC output boost power circuit module 4 is used for according to described ripple signal V
D, after the input power supply carried out power factor correction and boost, obtain out-put supply; And
PFC linear regulation module 2 is used to utilize described sampling input current I
IN, be created on linear regulation is carried out in heavy duty to the interior current loop control that described PFC control circuit module 3 is carried out of underloading scope linear regulation parameter;
Wherein, by the current loop control of PFC control circuit module 3 being carried out linear regulation with the linear regulation parameter, the ripple signal V that PFC control circuit module 3 is generated
DCan export boost power circuit module 4 to PFC and carry out linear regulation control.
That is to say that PFC control circuit module 3 is according to the input voltage V of sampling
IN, input current I
IN, and linear regulation parameter, generated and sent out ripple signal V what PFC output boost power circuit module 4 was carried out linear regulation control
D
Fig. 2 has shown the principle of PFC control circuit module 3, and this PFC control circuit module 3 comprises:
Voltage loop control module 7 is used for according to output voltage V
OUTWith the reference voltage V that presets
REFDifference carry out Voltage loop control, this Voltage loop control module 7 for example can be the proportional integral ring;
Current loop controller module 9 is used for according to input current and reference current I
REFDifference carry out current loop control, and current loop control is carried out linear regulation, thereby generates a ripple signal V who carries out power factor correction in the full-load range that is adapted at from the heavy duty to the underloading and boost according to the linear regulation parameter
D
This current loop controller module 9 can be a pid control module, carries out control of proportional control and/or proportional+integral and/or ratio+differential control as required, and in the case, linear regulation parameter of the present invention can be linear scale factor K
P(I
IN) and/or linear scale integral coefficient K
I(I
IN) and/or linear scale differential coefficient K
D(I
IN).
Fig. 3 a has shown the basic structure of the PFC linear regulation device module 2 in the PFC control circuit of the present invention, comprising: current limit unit 21 is used for input current I
INCarry out amplitude limit; Linear regulation parameter generating unit 22 is used for according to the input current of amplitude limit and fixing coefficient generate the linear regulation parameter.
Fig. 3 b has shown first embodiment of the PFC linear regulation device module 2 shown in Fig. 3 a, and wherein linear regulation parameter generating unit 22 comprises:
Generate the coefficient generation unit 222 of fixing coefficient; With
By input current being multiply by the multiplier 221 that fixing coefficient obtains continuous linear regulation parameter.In example shown in Figure 4 down, the linear regulation parameter is the dynamic proportion coefficient.
Fig. 3 c has shown second embodiment of the PFC linear regulation device module 2 shown in Fig. 3 a, and wherein, joint parameter generating unit 22 comprises:
Generate the coefficient generation unit 222 of fixing coefficient; With
By input current being multiply by the multiplier 221 that fixing coefficient obtains continuous linear regulation parameter; With
Continuous linear regulation parameter is converted to the discretization unit 223 of discrete linear regulation parameter.
In addition, the invention provides a kind of PFC control method of utilizing a kind of linear regulation of circuit execution shown in Figure 1, may further comprise the steps:
From input power supply sampling input voltage V
IN
From input power supply sampling input current I
IN
From out-put supply sampling and outputting voltage V
OUT
Utilize the input current I of sampling
INThe linear regulation parameter of generation in from heavy duty to the underloading scope;
Input voltage V according to sampling
IN, input current I
IN, output voltage V
OUTAnd the linear regulation parameter, generation is used for to the power factor correction of input power supply and boosts carrying out a ripple signal V of linear regulation control
DAnd
With described ripple signal V
DLinear regulation is carried out in the power factor correction and boosting of input power supply control, obtain described out-put supply.
The present invention generates described linear regulation parameter by following operation:
To input current I
INCarry out amplitude limit;
According to the input current and the coefficient of amplitude limit, generate the linear regulation parameter.
Wherein, the linear regulation parameter is by input current being multiply by the continuous linear regulation parameter that fixing coefficient obtains.
Wherein, the linear regulation parameter is after continuous linear regulation parameter is carried out discretization, the discrete linear regulation parameter that obtains.
Linear regulation parameter of the present invention is the dynamic proportion coefficient that is suitable for the full-load range from the heavy duty to the underloading, and generates by following steps:
By to input current I
INCarry out amplitude limit, input current I
INBe limited in the maximum current I that presets
MAXWith the minimum current I that presets
MINBetween the scope;
The maximum current I that presets will be limited in
NAXWith the minimum current I that presets
MINInput current I between the scope
INMultiply by proportionality coefficient, obtain corresponding to dynamic proportion coefficient from heavy duty to the underloading scope.
Fig. 4 has shown that working as the dynamic proportion coefficient is dynamic linear proportionality coefficient K
P(I
IN) and/or linear scale integral coefficient K
I(I
IN) and/or linear scale differential coefficient K
0(I
IN) time, the software flow of generation dynamic proportion coefficient.
Step 10: obtain input current I
IN
Step 11: judge I
INWhether more than or equal to the maximum current I that presets
MAX
Step 12: if I
INMore than or equal to the maximum current I that presets
MAX, I then
INGet I
MAXValue, enter step 15 then;
Step 13: if I
INLess than the maximum current I that presets
MAX, then judge I
INWhether smaller or equal to the minimum current I that presets
MIN
Step 14: if I
INSmaller or equal to the minimum current I that presets
MIN, I then
INGet I
MINValue, enter step 15 then;
By above-mentioned steps 10 to 14, with input current I
INBe limited in I
MAXAnd minimum current I
MINBetween.
Step 15: will be limited in I
MAXAnd minimum current I
MINBetween input current I
INMultiply by proportionality coefficient M
P, obtain dynamic linear proportionality coefficient K
P(I
IN);
Step 16: will be limited in I
MAXAnd minimum current I
MINBetween input current I
INMultiply by proportional integral coefficient M
I, obtain dynamic linear proportional integral COEFFICIENT K
I(I
IN);
Step 17: will be limited in I
MAXAnd minimum current I
MINBetween input current I
INMultiply by proportion differential coefficient M
D, obtain dynamic linear proportion differential COEFFICIENT K
D(I
IN).
The present invention has introduced linear regulation device on the basis of PFC dicyclo controlling schemes, interior circular current ring Control Parameter in the PFC control circuit module 3 is not re-used as fixing constant to be used, but, carry out dynamic adjustments as the output function of linear regulation device.So just can utilize the size of load or input current, the ring parameter is finished effective Waveform Control in adjusting linearly.
Need to prove input current I of the present invention
INBe not limited to input current, also comprise possible input inductance electric current, load current and the input power and the power output that are equal to electric current;
In addition, it is the linear regulation signal of function with the input current signal that linear regulation parameter of the present invention is actually one, such as dynamic linear proportionality coefficient K
P(I
IN), dynamic linear proportional integral COEFFICIENT K
I(I
IN) and dynamic linear proportion differential COEFFICIENT K
D(I
IN) in one or more.
The invention solves the defective and the deficiency that exist in the prior art, on the basis of traditional controlling schemes, can finish by software in steps, needn't increase new hardware circuit.The linear regulation control mode that proposes can realize the index optimization in the full-load range, and the overall efficiency when also having improved underload has simultaneously reduced reactive loss.Particularly in 50% following load, improved industry standard greatly, this scheme can be widely used in the present PFC control circuits at different levels.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.
Claims (10)
1. PFC control circuit with linear regulation comprises:
PFC input voltage sampling module (5) is used for from input power supply sampling input voltage V
IN
PFC input current sampling module (1) is used for from input power supply sampling input current I
IN
PFC output voltage sampling module (6) is used for from out-put supply sampling and outputting voltage V
OUT
PFC control circuit module (3) is used for the input voltage V according to PFC input voltage sampling module (5), PFC input current sampling module (1) and PFC output voltage sampling module (6) sampling
IN, input current I
INAnd output voltage V
OUT, generate and send out ripple signal V
D
PFC exports boost power circuit module (4), is used for according to described ripple signal V
D, after the input power supply carried out power factor correction and boost, obtain described out-put supply;
It is characterized in that, also comprise:
PFC linear regulation module (2) is used to utilize described sampling input current I
INBe created on heavy duty in the underloading scope, the current loop control of described PFC control circuit module (3) execution carried out the linear regulation parameter of linear regulation;
Wherein, the current loop control of PFC control circuit module (3) is carried out linear regulation, make a ripple signal V of its generation by utilizing the linear regulation parameter
DPFC output boost power circuit module (4) is carried out linear regulation control.
2. PFC control circuit according to claim 1 is characterized in that, described PFC linear regulation device module (2) comprising:
Current limit unit (21) is used for input current I
INCarry out amplitude limit;
Linear regulation parameter generating unit (22) is used for the basis input current and the fixing coefficient of amplitude limit, generates the linear regulation parameter.
3. PFC control circuit according to claim 2 is characterized in that, described linear regulation parameter generating unit (22) comprises multiplier (221), is used for input current be multiply by fixing coefficient, obtains continuous linear regulation parameter.
4. PFC control circuit according to claim 3 is characterized in that, described linear regulation parameter generating unit (22) also comprises discretization unit (223), is used for converting continuous linear regulation parameter to discrete linear regulation parameter.
5. according to claim 3 or 4 described PFC control circuits, it is characterized in that described linear regulation parameter generating unit (22) also comprises coefficient generation unit (222), be used to generate fixing coefficient.
6. PFC control method with linear regulation is characterized in that may further comprise the steps:
From input power supply sampling input voltage V
INWith input current I
IN, and from out-put supply sampling and outputting voltage V
OUT
Utilize the input current I of sampling
INThe linear regulation parameter of generation in from heavy duty to the underloading scope;
Input voltage V according to sampling
IN, input current I
IN, output voltage V
OUTAnd the linear regulation parameter, generation is used for to the power factor correction of input power supply and boosts carrying out a ripple signal V of linear regulation control
DAnd
By with described ripple signal V
DLinear regulation is carried out in the power factor correction and boosting of input power supply control, obtain described out-put supply.
7. PFC control method according to claim 6 is characterized in that, the step that generates described linear regulation parameter comprises:
To input current I
INCarry out amplitude limit;
Input current and fixing coefficient according to amplitude limit generate the linear regulation parameter.
8. PFC control method according to claim 2 is characterized in that, described linear regulation parameter is by input current being multiply by the continuous linear regulation parameter that fixing coefficient obtains.
9. PFC control method according to claim 8 is characterized in that, described linear regulation parameter is the discrete linear regulation parameter that continuous linear regulation parameter is carried out obtaining after the discretization.
10. according to Claim 8 or 9 described PFC control methods, it is characterized in that described linear regulation parameter is the dynamic proportion coefficient that adapts to the full-load range from the heavy duty to the underloading, and generate by following steps:
By to input current I
INCarry out amplitude limit, input current I
INBe limited in the maximum current I that presets
MAXWith the minimum current I that presets
MINBetween the scope;
The maximum current I that presets will be limited in
MAXWith the minimum current I that presets
MINInput current I between the scope
INMultiply by proportionality coefficient, obtain corresponding to dynamic proportion coefficient from heavy duty to the underloading scope.
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|---|---|---|---|
| CN201010148686.0A CN101814825B (en) | 2010-04-16 | 2010-04-16 | Linear-regulated PFC (Power Factor Correction) control circuit and control method |
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|---|---|---|---|
| CN201010148686.0A CN101814825B (en) | 2010-04-16 | 2010-04-16 | Linear-regulated PFC (Power Factor Correction) control circuit and control method |
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|---|---|
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| CN101814825B CN101814825B (en) | 2014-03-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103178705A (en) * | 2011-12-26 | 2013-06-26 | 比亚迪股份有限公司 | Method and device for controlling power-factor correction circuit |
| CN103904881A (en) * | 2014-03-04 | 2014-07-02 | 东莞博用电子科技有限公司 | Partial active power factor correction circuit with input voltage threshold adaptively controlled |
| CN103904880A (en) * | 2014-03-04 | 2014-07-02 | 东莞博用电子科技有限公司 | Part active power factor correction circuit controlled by input voltage threshold value |
| CN104467396A (en) * | 2013-09-24 | 2015-03-25 | 厦门蓝溪科技有限公司 | Digital PFC control system for power source products |
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| CN103178705A (en) * | 2011-12-26 | 2013-06-26 | 比亚迪股份有限公司 | Method and device for controlling power-factor correction circuit |
| CN103178705B (en) * | 2011-12-26 | 2016-04-13 | 比亚迪股份有限公司 | The control method of circuit of power factor correction and device |
| CN104467396A (en) * | 2013-09-24 | 2015-03-25 | 厦门蓝溪科技有限公司 | Digital PFC control system for power source products |
| CN103904881A (en) * | 2014-03-04 | 2014-07-02 | 东莞博用电子科技有限公司 | Partial active power factor correction circuit with input voltage threshold adaptively controlled |
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| CN111934533A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof, storage medium and variable-frequency air conditioner |
| CN111934532A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner |
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