CN103532369B - The control method of pfc circuit and device and pfc circuit and digital power - Google Patents
The control method of pfc circuit and device and pfc circuit and digital power Download PDFInfo
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- CN103532369B CN103532369B CN201210232953.1A CN201210232953A CN103532369B CN 103532369 B CN103532369 B CN 103532369B CN 201210232953 A CN201210232953 A CN 201210232953A CN 103532369 B CN103532369 B CN 103532369B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a kind of control method of pfc circuit and device and pfc circuit and digital power, the control method of this pfc circuit comprises: the desired value obtaining pfc circuit output voltage; Detect the actual value of pfc circuit output voltage; Size according to the absolute value of the difference between the desired value of output voltage and actual value carries out assignment to the set point of pfc circuit Voltage loop; Pfc circuit is controlled by Voltage loop according to set point.By detecting the difference of current circuit actual output voltage and desired value, the set point parameter of Voltage loop is adjusted in real time, the output voltage of circuit is made slowly to increase, ensure that starting current can not be excessive by the restriction rate of pressure rise, thus avoid the direct control objectives value of circuit that uses directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability causing electric current to rise instantaneously bringing reduces.Improve the safety and reliability of pfc circuit.
Description
Technical field
The present invention relates to field of power supplies, in particular to a kind of control method of pfc circuit and device and pfc circuit and digital power.
Background technology
Along with the performance of power-supply system and improving constantly of power, realize the necessary number of elements of power source performance index and cost also increases thereupon, increasing control needs to pass through digital circuit.Digital power is the novel power supply technology adopting digital form to realize the control of power supply, protective loop and communication interface.Able to programme, response and digital loop control to be the principal character of digital power.
Power factor correction (PowerFactorCorrection, PFC) circuit in digital power for improving the power factor of digital power, thus reduces the loss of Power Exchange.The control of the power factor correction unit of general digital power is undertaken by the double-closed-loop control of Voltage loop and electric current loop, wherein Voltage loop is used for burning voltage output, reference current amplitude is provided simultaneously, electric current loop is used for the phase place of control inputs electric current and the Phase synchronization of input voltage, by the set point of the output voltage stabilization of digital power in Voltage loop.
But the power factor correction (PowerFactorCorrection in digital power, PFC) circuit, special for the pfc circuit with boost function in start-up course, there is starting current larger, there is superheating phenomenon, can components and parts be burnt time serious, reduce the reliability of pfc circuit and digital power.
In prior art, pfc circuit starting current causes more greatly the problem that reliability is low, not yet proposes effective solution.
Summary of the invention
The present invention aims to provide a kind of control method of pfc circuit and device and pfc circuit and digital power, causes more greatly the low problem of reliability to solve pfc circuit starting current in prior art.
To achieve these goals, according to an aspect of the present invention, a kind of control method of pfc circuit is provided.The control method of this pfc circuit comprises: the desired value obtaining pfc circuit output voltage; Detect the actual value of pfc circuit output voltage; Size according to the absolute value of the difference between the desired value of output voltage and actual value carries out assignment to the set point of pfc circuit Voltage loop; Pfc circuit is controlled by Voltage loop according to set point.
Further, carry out assignment according to the absolute value of the difference between the desired value of output voltage and actual value to the set point of pfc circuit Voltage loop to comprise: calculate the difference between the desired value of output voltage and actual value; The relatively absolute value of difference and the size of predetermined threshold value; According to comparative result, assignment is carried out to the set point of pfc circuit Voltage loop.
Further, according to comparative result, assignment is carried out to the set point of pfc circuit Voltage loop and comprises: when the absolute value of difference is greater than threshold value, with set point with preset value-added and assignment set point again; When the absolute value of difference is not more than threshold value, with desired value assignment set point.
Further, predetermined threshold value equals the product of desired value and the first preset value.
Further, default increment equals the product of difference between the desired value of output voltage and actual value and the second preset value.
Further, control pfc circuit and comprise: exported the pwm signal controlling pfc circuit breaker in middle pipe according to set point by Voltage loop according to set point by Voltage loop, the duty ratio of pwm signal is with the size variation of set point.
According to another aspect of the present invention, a kind of control device of pfc circuit is provided.The control device of this pfc circuit comprises: desired value acquisition module, for obtaining the desired value of pfc circuit output voltage; Voltage detection module, for detecting the actual value of pfc circuit output voltage; Parameter assignment module, the size for the absolute value according to the difference between the desired value of output voltage and actual value carries out assignment to the set point of pfc circuit Voltage loop; Control module, for controlling pfc circuit according to set point by Voltage loop.
Further, parameter assignment module comprises: calculating sub module, for calculating the difference between the desired value of output voltage and actual value; Comparison sub-module, for the size of the absolute value and predetermined threshold value that compare difference; Set point assignment submodule, for carrying out assignment according to comparative result to the set point of pfc circuit Voltage loop.
According to another aspect of the present invention, a kind of pfc circuit is provided.This pfc circuit comprises the control device of any one pfc circuit above-mentioned.
According to another aspect of the present invention, a kind of digital power is provided.This digital power comprises above-mentioned pfc circuit.
Apply technical scheme of the present invention, the control method of pfc circuit of the present invention comprises: the desired value obtaining pfc circuit output voltage; Detect the actual value of pfc circuit output voltage; Size according to the absolute value of the difference between the desired value of output voltage and actual value carries out assignment to the set point of pfc circuit Voltage loop; Pfc circuit is controlled by Voltage loop according to set point.By detecting the difference of current circuit actual output voltage and desired value, the set point parameter of Voltage loop is adjusted in real time, the output voltage of circuit is made slowly to increase, ensure that starting current can not be excessive by the restriction rate of pressure rise, thus avoid the direct control objectives value of circuit that uses directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability causing electric current to rise instantaneously bringing reduces.Improve the safety and reliability of pfc circuit.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the control device of pfc circuit according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the pfc circuit according to the embodiment of the present invention;
Fig. 3 is the schematic diagram of the control method of pfc circuit according to the embodiment of the present invention;
Fig. 4 is the flow chart of the control method of pfc circuit according to the preferred embodiment of the invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiments provide a kind of control device of pfc circuit, Fig. 1 is the schematic diagram of the control device of pfc circuit according to the embodiment of the present invention, as shown in Figure 1, the control device of the pfc circuit that the embodiment of the present invention provides comprises: desired value acquisition module 11, for obtaining the desired value of pfc circuit output voltage; Voltage detection module 13, for detecting the actual value of pfc circuit output voltage; Parameter assignment module 15, the size for the absolute value according to the difference between the desired value of output voltage and actual value carries out assignment to the set point of pfc circuit Voltage loop; Control module 17, for controlling pfc circuit according to set point by Voltage loop.
The pfc circuit control device of the application embodiment of the present invention, by detecting the difference of current circuit actual output voltage and desired value, the set point parameter of Voltage loop is adjusted in real time, the output voltage of circuit is made slowly to increase, ensure that starting current can not be excessive by the restriction rate of pressure rise, thus avoid and directly use the control objectives value of circuit directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability causing electric current to rise instantaneously bringing reduces.Improve the safety and reliability of pfc circuit.
Wherein, parameter assignment module 15 specifically can comprise: calculating sub module, for calculating the difference between the desired value of output voltage and actual value; Comparison sub-module, for the size of the absolute value and predetermined threshold value that compare difference; Set point assignment submodule, for carrying out assignment according to comparative result to the set point of pfc circuit Voltage loop.Thus in conjunction with the desired value of output voltage and actual value, pfc circuit is controlled, both ensure that the output voltage making pfc circuit reaches desired value, considered again actual operating state.
Above-mentionedly according to comparative result, assignment is carried out to the set point of pfc circuit Voltage loop and can comprise: when the absolute value of above-mentioned difference is greater than threshold value, with set point with preset value-added and assignment set point again; When the absolute value of difference is not more than threshold value, with desired value assignment set point.That is when actual value is close to desired value, control pfc circuit realize target, when the gap of actual value and desired value is still large, increase set point step by step, thus steady lifting PFC output voltage.
The amplitude that set point increases, namely above-mentioned default value-added setting can for presetting the product of difference and the second preset value rising in value and equal between the desired value of output voltage and actual value, wherein the size of the second preset value can need setting flexibly according to working control, when requiring pfc circuit comparatively fast to reach dbjective state, second preset value needs to arrange larger, when requiring fail safe higher, the second preset value needs to arrange smaller.That is the second preset value is larger, and the rate of pressure rise is faster.The general value of this value is 5% to 20%.
The size of above-mentioned threshold value can equal the product of desired value and the first preset value.This threshold value same is larger, and control rate is faster.
The execution step of control module 17 can be specifically exported according to set point the pwm signal controlling pfc circuit breaker in middle pipe by Voltage loop, and the duty ratio of this pwm signal is with the size variation of set point.
The embodiment of the present invention additionally provides a kind of pfc circuit, comprises the control device of any one pfc circuit that embodiment of the present invention foregoing provides.Fig. 2 is the schematic diagram of the pfc circuit according to the embodiment of the present invention, as shown in the figure, AC power AC is converted to direct current by rectifier bridge 21, pfc circuit 20 comprises inductance L 1, switching tube Q1, diode D1, pfc circuit control device by controlling the collection switch tube of voltage and current, to reach the object improving power factor and boosting.The voltage detection module 13 of pfc circuit control device by detecting output voltage, and adjusts the set point of Voltage loop, and is exported the pwm signal controlling pfc circuit breaker in middle pipe by Voltage loop according to set point by control module 17.Illustrate only the structure of Single-phase PFC circuit in Fig. 2, but the pfc circuit of the present embodiment and pfc circuit control device also can be applied in the pfc circuit of three-phase.Only need to increase alive control point, and corresponding PWM drive singal is sent to the switching tube of three-phase.
The embodiment of the present invention additionally provides a kind of digital power, includes above-mentioned pfc circuit, and uses the control device of above-mentioned pfc circuit to control.
The embodiment of the present invention additionally provides a kind of control method of pfc circuit, the control device of any one pfc circuit that the control method of this pfc circuit can be provided by the above embodiment of the present invention performs, and, the control method of this pfc circuit can be applied to and comprise above pfc circuit, Fig. 3 is the schematic diagram of the control method of pfc circuit according to the embodiment of the present invention, as shown in the figure, the control method of this pfc circuit comprises:
Step S31, obtains the desired value of pfc circuit output voltage;
Step S33, detects the actual value of pfc circuit output voltage;
Step S35, the size according to the absolute value of the difference between the desired value of output voltage and actual value carries out assignment to the set point of pfc circuit Voltage loop;
Step S37, controls pfc circuit according to set point by Voltage loop.
By detecting the difference of current circuit actual output voltage and desired value, the set point parameter of Voltage loop is adjusted in real time, the output voltage of circuit is made slowly to increase, ensure that starting current can not be excessive by the restriction rate of pressure rise, thus avoid the direct control objectives value of circuit that uses directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability causing electric current to rise instantaneously bringing reduces.Improve the safety and reliability of pfc circuit.
Wherein, step S35 specifically can comprise: calculate the difference between the desired value of output voltage and actual value; The relatively absolute value of difference and the size of predetermined threshold value; According to comparative result, assignment is carried out to the set point of pfc circuit Voltage loop.Above-mentionedly according to comparative result, assignment is carried out to the set point of pfc circuit Voltage loop and specifically can comprise: when the absolute value of difference is greater than threshold value, with set point with preset value-added and assignment set point again; When the absolute value of difference is not more than threshold value, with desired value assignment set point.Thus in conjunction with the desired value of output voltage and actual value, pfc circuit is controlled, both ensure that the output voltage making pfc circuit reaches desired value, examined again actual operating state.
The value of above-mentioned predetermined threshold value equals the product of desired value and the first preset value, presets the product that value-added value equals difference between the desired value of output voltage and actual value and the second preset value.The amplitude that set point increases, namely above-mentioned default value-added setting can for presetting the product of difference and the second preset value rising in value and equal between the desired value of output voltage and actual value, wherein the size of the second preset value can need setting flexibly according to working control, when requiring pfc circuit comparatively fast to reach dbjective state, second preset value needs to arrange larger, when requiring fail safe higher, the second preset value needs to arrange smaller.That is the second preset value is larger, and the rate of pressure rise is faster.The general value of this value is 5% to 20%.
The size of above-mentioned threshold value can equal the product of desired value and the first preset value.This threshold value same is larger, and control rate is faster.
Step S37 can comprise: exported the pwm signal controlling pfc circuit breaker in middle pipe by Voltage loop according to set point, and the duty ratio of pwm signal is with the size variation of set point.
Fig. 4 is the flow chart of the control method of pfc circuit according to the preferred embodiment of the invention, and as shown in the figure, the control method idiographic flow of the pfc circuit of the preferred embodiment of the present invention is:
Pfc circuit starts;
Obtain pfc circuit output voltage and should reach desired value parameter;
The actual value of output voltage is detected by voltage measuring apparatus;
Compare the absolute value of difference between the desired value of output voltage and actual value and the size of threshold value, when the absolute value of the difference between the desired value and actual value of output voltage is not more than threshold value, set point assignment pfc circuit Voltage loop controlled is above-mentioned desired value, when the absolute value of the difference between the desired value and actual value of output voltage is greater than threshold value, set point assignment pfc circuit Voltage loop controlled is that current set value adds 10% of desired value and actual value difference, and wherein two preset values of 2% and 10% can change flexibly according to the requirement controlled;
Pfc circuit is controlled by Voltage loop according to set point, that is, when current output voltage is close to desired value, directly pfc circuit is controlled, if when current output voltage differs larger with desired value according to desired value, progressively increase set point, the amplitude of increase is determined according to the size of difference;
Judge whether control procedure terminates, namely judge the control objectives that pfc circuit has reached default, do not complete if control the step returning and detect actual value, carry out loop control, until pfc circuit has reached default control objectives.
For pfc circuit boosting target for 380V, time initial, 220V line voltage exports about 310V after rectifier bridge rectification, time initial, the switching tube of pfc circuit is in off state, the output voltage of pfc circuit equals input voltage 310V, 380V*2%=7.6V, now | 380-310|=70V, 70V > 7.6V, now set point assignment is 310+ (380-310) * 10%=317V, control PFC Voltage loop using set point 317V as the target of again boosting, current output voltage value is again detected after having boosted, carry out second time again to compare, circulation like this.When meeting | 380-current detection value | during < 7.6V, set point assignment is 380V, completes boosting and regulates.
The pfc circuit control method of the application embodiment of the present invention and control device, by detecting the difference of current circuit actual output voltage and desired value, the set point parameter of Voltage loop is adjusted in real time, the output voltage of circuit is made slowly to increase, ensure that starting current can not be excessive by the restriction rate of pressure rise, thus avoid the direct control objectives value of circuit that uses directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability causing electric current to rise instantaneously bringing reduces.Improve the safety and reliability of pfc circuit.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a control method for pfc circuit, is characterized in that, comprising:
Obtain the desired value of described pfc circuit output voltage;
Detect the actual value of described pfc circuit output voltage;
Size according to the absolute value of the difference between the desired value of described output voltage and described actual value carries out assignment to the set point of pfc circuit Voltage loop, and Voltage loop is used for burning voltage and exports, and provides reference current amplitude simultaneously;
Control described pfc circuit according to described set point by Voltage loop, carry out assignment according to the set point of absolute value to described pfc circuit Voltage loop of the difference between the desired value of described output voltage and described actual value and comprise:
Calculate the difference between the desired value of described output voltage and described actual value;
The absolute value of more described difference and the size of predetermined threshold value;
Carry out assignment according to the set point of comparative result to described pfc circuit Voltage loop, carry out assignment according to the set point of comparative result to described pfc circuit Voltage loop and comprise:
When the absolute value of described difference is greater than described threshold value, with set point with preset value-added and set point described in assignment again;
When the absolute value of described difference is not more than described threshold value, with set point described in described desired value assignment.
2. control method according to claim 1, is characterized in that, described predetermined threshold value equals the product of described desired value and the first preset value.
3. control method according to claim 1, is characterized in that, described default increment equals the product of difference between the desired value of described output voltage and described actual value and the second preset value.
4. control method according to claim 1, it is characterized in that, control described pfc circuit according to described set point by Voltage loop to comprise: to be exported by Voltage loop according to described set point and control the pwm signal of described pfc circuit breaker in middle pipe, the duty ratio of described pwm signal is with the size variation of described set point.
5. a control device for pfc circuit, is characterized in that, comprising:
Desired value acquisition module, for obtaining the desired value of described pfc circuit output voltage;
Voltage detection module, for detecting the actual value of described pfc circuit output voltage;
Parameter assignment module, the size for the absolute value according to the difference between the desired value of described output voltage and described actual value carries out assignment to the set point of pfc circuit Voltage loop, and Voltage loop is used for burning voltage and exports, and provides reference current amplitude simultaneously;
Control module, for controlling described pfc circuit according to described set point by Voltage loop, described parameter assignment module comprises:
Calculating sub module, for calculating the difference between the desired value of described output voltage and described actual value;
Comparison sub-module, for the absolute value of more described difference and the size of predetermined threshold value;
Set point assignment submodule, for carrying out assignment according to the set point of comparative result to described pfc circuit Voltage loop, wherein, carry out assignment according to the set point of comparative result to described pfc circuit Voltage loop, carry out assignment according to the set point of comparative result to described pfc circuit Voltage loop and comprise:
When the absolute value of described difference is greater than described threshold value, with set point with preset value-added and set point described in assignment again;
When the absolute value of described difference is not more than described threshold value, with set point described in described desired value assignment.
6. a pfc circuit, is characterized in that, comprises the control device of pfc circuit according to claim 5.
7. a digital power, is characterized in that, comprises pfc circuit according to claim 6.
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| CN103944409B (en) * | 2014-04-17 | 2016-08-24 | 华为技术有限公司 | The control method of a kind of converter, equipment and system |
| CN104656735B (en) * | 2014-12-19 | 2016-03-02 | 珠海格力电器股份有限公司 | The controling parameters control method of circuit of power factor correction and device and air conditioner |
| CN104953814B (en) * | 2015-06-29 | 2018-06-15 | 海信（山东）空调有限公司 | A kind of method and apparatus for controlling pfc circuit |
| CN105186521A (en) * | 2015-10-16 | 2015-12-23 | 珠海格力电器股份有限公司 | Circuit filtering power grid ripple and filtering method thereof |
| CN111245239B (en) * | 2020-03-25 | 2021-04-13 | 中车青岛四方车辆研究所有限公司 | Voltage stabilization control method and system for three-level Boost circuit input voltage fluctuation |
| CN112019037A (en) * | 2020-08-07 | 2020-12-01 | 珠海格力电器股份有限公司 | PFC circuit start control method, device, equipment and computer readable medium |
| CN114123757B (en) * | 2021-11-24 | 2023-10-10 | 珠海格力电器股份有限公司 | Switching power supply circuit, control method and device and isolating switching power supply |
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| JP3394915B2 (en) * | 1998-09-28 | 2003-04-07 | 富士通アクセス株式会社 | Power supply |
| JP4052195B2 (en) * | 2003-07-31 | 2008-02-27 | トヨタ自動車株式会社 | Voltage conversion device and computer-readable recording medium recording program for causing computer to execute control of voltage conversion |
| US7123039B2 (en) * | 2004-08-13 | 2006-10-17 | Jason Gonzalez | Testing input/output voltages in integrated circuits |
| JP5684987B2 (en) * | 2010-01-25 | 2015-03-18 | セイコーインスツル株式会社 | Switching regulator |
| CN101867283B (en) * | 2010-06-13 | 2014-03-19 | 中兴通讯股份有限公司 | Method and device for improving control characteristic of power factor correction |
| US9065327B2 (en) * | 2011-02-08 | 2015-06-23 | Lear Corporation | Efficiency optimized power converter with dual voltage power factor correction |
| CN102512169B (en) * | 2011-12-31 | 2013-06-05 | 重庆邮电大学 | Adaptive control method and device for deviation in skin electrical signal testing |
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