CN103532369A - Control method and device of PFC circuit, PFC circuit and digital power supply - Google Patents
Control method and device of PFC circuit, PFC circuit and digital power supply Download PDFInfo
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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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- 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 control method and a device of a PFC circuit, the PFC circuit and a digital power supply, wherein the control method of the PFC circuit comprises the following steps: acquiring a target value of the output voltage of the PFC circuit; detecting an actual value of an output voltage of the PFC circuit; assigning a set value of the voltage loop of the PFC circuit according to the absolute value of the difference value between the target value and the actual value of the output voltage; and controlling the PFC circuit through the voltage loop according to a set value. The method has the advantages that the difference value between the actual output voltage of the current circuit and the target value is detected, the set value parameters of the voltage ring are adjusted in real time, the output voltage of the circuit is slowly increased, the starting current is guaranteed not to be overlarge by limiting the boosting speed, and therefore the situation that the control target value of the circuit is directly used as the set value of the voltage ring is avoided, the output voltage of the PFC circuit is suddenly increased, and the reliability is reduced due to the fact that the current instantly rises. The safety and the reliability of the PFC circuit are improved.
Description
Technical field
The present invention relates to field of power supplies, in particular to a kind of control method and device and pfc circuit and digital power of pfc circuit.
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, and increasing control need to be passed through digital circuit.Digital power is to adopt digital form to realize the novel power supply technology of the control of power supply, protection loop and communication interface.It is the principal character of digital power that able to programme, response and digital loop are controlled.
Power factor correction in digital power (Power Factor Correction, PFC) circuit is used for improving the power factor of digital power, thereby reduces the loss of Power Exchange.The control of the power factor correction unit of general digital power is to be undertaken by two closed-loop controls of Voltage loop and electric current loop, wherein Voltage loop is for burning voltage output, reference current amplitude is provided simultaneously, electric current loop is for the phase place of control inputs electric current and the Phase synchronization of input voltage, by the output voltage stabilization of digital power in the set point of Voltage loop.
But (the Power Factor Correction of the power factor correction in digital power, PFC) circuit, special for the pfc circuit with boost function in start-up course, exist starting current larger, there is superheating phenomenon, when serious, can burn components and parts, 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 and device and pfc circuit and digital power of pfc circuit, to solve pfc circuit starting current in prior art, causes more greatly the low problem of reliability.
To achieve these goals, according to an aspect of the present invention, provide a kind of control method of pfc circuit.The control method of this pfc circuit comprises: the desired value of obtaining pfc circuit output voltage; Detect the actual value of pfc circuit output voltage; According to the size of the absolute value of the difference between the desired value of output voltage and actual value, the set point of pfc circuit Voltage loop is carried out to assignment; According to set point, by Voltage loop, control pfc circuit.
Further, according to the absolute value of the difference between the desired value of output voltage and actual value, the set point of pfc circuit Voltage loop being carried out to assignment comprises: calculate the desired value of output voltage and the difference between actual value; Compare the absolute value of difference and the size of predetermined threshold value; According to comparative result, the set point of pfc circuit Voltage loop is carried out to assignment.
Further, according to comparative result, the set point of pfc circuit Voltage loop is carried out to assignment and comprise: when the absolute value of difference is greater than threshold value, with set point and default 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 desired value of output voltage and the product of the difference between actual value and the second preset value.
Further, according to set point, by Voltage loop, control pfc circuit and comprise: according to set point, by Voltage loop, export the pwm signal of controlling switching tube in pfc circuit, the duty ratio of pwm signal is with the size variation of set point.
A kind of control device of pfc circuit is provided according to another aspect of the present invention.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 detection of the actual value of pfc circuit output voltage; Parameter assignment module, for carrying out assignment according to the size of 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; Control module, for controlling pfc circuit according to set point by Voltage loop.
Further, parameter assignment module comprises: calculating sub module, for calculating the desired value of output voltage and the difference between actual value; Comparison sub-module, for comparing the absolute value of difference and the size of predetermined threshold value; 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, provide a kind of pfc circuit.This pfc circuit comprises the control device of above-mentioned any pfc circuit.
According to another aspect of the present invention, provide a kind of digital power.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 of obtaining pfc circuit output voltage; Detect the actual value of pfc circuit output voltage; According to the size of the absolute value of the difference between the desired value of output voltage and actual value, the set point of pfc circuit Voltage loop is carried out to assignment; According to set point, by Voltage loop, control pfc circuit.By detecting the difference of current circuit actual output voltage and desired value, set point parameter to Voltage loop is adjusted in real time, make the output voltage rising of circuit, by the restriction rate of pressure rise, guaranteed that starting current can be not excessive, thereby the control desired value of having avoided direct use circuit is directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability that causes electric current moment rising to bring reduces.Improved the safety and reliability of pfc circuit.
Accompanying drawing explanation
The Figure of description that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the control device of the pfc circuit of the embodiment of the present invention;
Fig. 2 is according to the schematic diagram of the pfc circuit of the embodiment of the present invention;
Fig. 3 is according to the schematic diagram of the control method of the pfc circuit of 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, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The embodiment of the present invention provides a kind of control device of pfc circuit, Fig. 1 is according to the schematic diagram of the control device of the pfc circuit of 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 detection of the actual value of pfc circuit output voltage; Parameter assignment module 15, for carrying out assignment according to the size of 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; 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, set point parameter to Voltage loop is adjusted in real time, make the output voltage rising of circuit, by the restriction rate of pressure rise, guaranteed that starting current can be not excessive, thereby avoided the control desired value of direct use circuit directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, the reliability that causes electric current moment rising to bring reduces.Improved the safety and reliability of pfc circuit.
Wherein, parameter assignment module 15 specifically can comprise: calculating sub module, for calculating the desired value of output voltage and the difference between actual value; Comparison sub-module, for comparing the absolute value of difference and the size of predetermined threshold value; Set point assignment submodule, for carrying out assignment according to comparative result to the set point of pfc circuit Voltage loop.Thereby desired value and actual value in conjunction with output voltage are controlled pfc circuit, both guaranteed to make the output voltage of pfc circuit to reach desired value, considered again actual operating state.
Above-mentionedly according to comparative result, the set point of pfc circuit Voltage loop is carried out to assignment and can comprise: when the absolute value of above-mentioned difference is greater than threshold value, with set point and default 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 to say when actual value approaches desired value, control pfc circuit realize target, when the gap of actual value and desired value is still larger, increase step by step set point, thus steady lifting PFC output voltage.
The amplitude that set point increases, namely above-mentioned default value-added setting can equal the desired value of output voltage and the product of the difference between actual value and the second preset value for default increment, wherein the size of the second preset value can need to set flexibly according to working control, when requiring pfc circuit comparatively fast to reach dbjective state, the second preset value need to arrange largerly, when requiring fail safe higher, the second preset value need to arrange smallerly.That is to say that the second preset value is larger, the rate of pressure rise is faster.This is worth general value 5% to 20%.
The size of above-mentioned threshold value can equal the product of desired value and the first preset value.Same this threshold value is larger, and control rate is faster.
The execution step of control module 17 can be specifically according to set point, by Voltage loop, to export the pwm signal of controlling switching tube in pfc circuit, and the duty ratio of this pwm signal is with the size variation of set point.
The embodiment of the present invention also provides a kind of pfc circuit, comprises the control device of any pfc circuit that embodiment of the present invention foregoing provides.Fig. 2 is according to the schematic diagram of the pfc circuit of the embodiment of the present invention, as shown in the figure, rectifier bridge 21 is converted to direct current by AC power AC, pfc circuit 20 comprises inductance L 1, switching tube Q1, diode D1, pfc circuit control device is controlled switching tube by the collection to voltage and current, to reach the object that improves power factor and boost.The voltage detection module 13 of pfc circuit control device is passed through to detect output voltage, and adjusts the set point of Voltage loop, and according to set point, by Voltage loop, exports by control module 17 pwm signal of controlling switching tube in pfc circuit.In Fig. 2, only show the structure of Single-phase PFC circuit, 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 the switching tube of three-phase is sent to corresponding PWM driving signal.
The embodiment of the present invention also provides a kind of digital power, has comprised above-mentioned pfc circuit, and uses the control device of above-mentioned pfc circuit to control.
The embodiment of the present invention also provides a kind of control method of pfc circuit, the control device of any pfc circuit that the control method of this pfc circuit can provide by the above embodiment of the present invention is carried out, and, the control method of this pfc circuit can be applied to comprise above pfc circuit, Fig. 3 is according to the schematic diagram of the control method of the pfc circuit of 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, the actual value of detection pfc circuit output voltage;
Step S35, carries out assignment according to the size of 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;
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, set point parameter to Voltage loop is adjusted in real time, make the output voltage rising of circuit, by the restriction rate of pressure rise, guaranteed that starting current can be not excessive, thereby the control desired value of having avoided direct use circuit is directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability that causes electric current moment rising to bring reduces.Improved the safety and reliability of pfc circuit.
Wherein, step S35 specifically can comprise: calculate the desired value of output voltage and the difference between actual value; Compare the absolute value of difference and the size of predetermined threshold value; According to comparative result, the set point of pfc circuit Voltage loop is carried out to assignment.Above-mentionedly according to comparative result, the set point of pfc circuit Voltage loop is carried out to assignment and specifically can comprise: when the absolute value of difference is greater than threshold value, with set point and default 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.Thereby desired value and actual value in conjunction with output voltage are controlled pfc circuit, both guaranteed to make the output voltage of pfc circuit to reach 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, and default value-added value equals the desired value of output voltage and the product of the difference between actual value and the second preset value.The amplitude that set point increases, namely above-mentioned default value-added setting can equal the desired value of output voltage and the product of the difference between actual value and the second preset value for default increment, wherein the size of the second preset value can need to set flexibly according to working control, when requiring pfc circuit comparatively fast to reach dbjective state, the second preset value need to arrange largerly, when requiring fail safe higher, the second preset value need to arrange smallerly.That is to say that the second preset value is larger, the rate of pressure rise is faster.This is worth general value 5% to 20%.
The size of above-mentioned threshold value can equal the product of desired value and the first preset value.Same this threshold value is larger, and control rate is faster.
Step S37 can comprise: according to set point, by Voltage loop, export the pwm signal of controlling switching tube in pfc circuit, 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;
By voltage measuring apparatus, detect the actual value of output voltage;
The desired value and the absolute value of the difference between actual value and the size of threshold value that compare output voltage, when the desired value of output voltage and the absolute value of the difference between actual value are not more than threshold value, the set point assignment that pfc circuit Voltage loop is controlled is above-mentioned desired value, when the desired value of output voltage and the absolute value of the difference between actual value are greater than threshold value, the set point assignment that pfc circuit Voltage loop is controlled be current set point add desired value and actual value difference 10%, wherein 2% and 10% two preset values can change flexibly according to the requirement of control;
According to set point, by Voltage loop, control pfc circuit, that is to say when current output voltage approaches desired value, directly according to desired value, control pfc circuit, if when current output voltage and desired value differ larger, progressively increase set point, the amplitude of increase is determined according to the size of difference;
Judge whether control procedure finishes, namely judge that pfc circuit has reached default control target, if controlled, return to the step that detects actual value, carry out loop control, until pfc circuit has reached default control target.
The pfc circuit of take boost target as 380V be example, when initial, 220V line voltage is exported about 310V after rectifier bridge rectification, when 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, after having boosted, again detect current output voltage value, compare for the second time again, so circulation.When meeting | 380-current detection value | during < 7.6V, set point assignment is 380V, completes the adjusting of boosting.
Pfc circuit control method and the control device of the application embodiment of the present invention, by detecting the difference of current circuit actual output voltage and desired value, set point parameter to Voltage loop is adjusted in real time, make the output voltage rising of circuit, by the restriction rate of pressure rise, guaranteed that starting current can be not excessive, thereby the control desired value of having avoided direct use circuit is directly as the set point of Voltage loop, the output voltage of pfc circuit is increased suddenly, and the reliability that causes electric current moment rising to bring reduces.Improved the safety and reliability of pfc circuit.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.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 modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
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;
According to the size of the absolute value of the difference between the desired value of described output voltage and described actual value, the set point of pfc circuit Voltage loop is carried out to assignment;
According to described set point, by Voltage loop, control described pfc circuit.
2. control method according to claim 1, is characterized in that, according to the absolute value of the difference between the desired value of described output voltage and described actual value, the set point of described pfc circuit Voltage loop is carried out to assignment and comprises:
Calculate the desired value of described output voltage and the difference between described actual value;
The absolute value of more described difference and the size of predetermined threshold value;
According to comparative result, the set point of described pfc circuit Voltage loop is carried out to assignment.
3. control method according to claim 2, is characterized in that, according to comparative result, the set point of described pfc circuit Voltage loop is carried out to assignment and comprises:
When the absolute value of described difference is greater than described threshold value, with set point and default 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.
4. according to the control method described in claim 2 or 3, it is characterized in that, described predetermined threshold value equals the product of described desired value and the first preset value.
5. control method according to claim 3, is characterized in that, described default increment equals the desired value of described output voltage and the product of the difference between described actual value and the second preset value.
6. control method according to claim 1, it is characterized in that, according to described set point, by Voltage loop, controlling described pfc circuit comprises: according to described set point, by Voltage loop, export the pwm signal of controlling switching tube in described pfc circuit, the duty ratio of described pwm signal is with the size variation of described set point.
7. 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 detection of the actual value of described pfc circuit output voltage;
Parameter assignment module, for carrying out assignment according to the size of the absolute value of the difference between the desired value of described output voltage and described actual value to the set point of pfc circuit Voltage loop;
Control module, for controlling described pfc circuit according to described set point by Voltage loop.
8. control device according to claim 7, is characterized in that, described parameter assignment module comprises:
Calculating sub module, for calculating the desired value of described output voltage and the difference between 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 comparative result to the set point of described pfc circuit Voltage loop.
9. a pfc circuit, is characterized in that, comprises according to the control device of the pfc circuit described in claim 7 or 8.
10. a digital power, is characterized in that, comprises pfc circuit according to claim 9.
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| CN201210232953.1A CN103532369B (en) | 2012-07-05 | 2012-07-05 | Control method and device of PFC circuit, PFC circuit and digital power supply |
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| CN201210232953.1A CN103532369B (en) | 2012-07-05 | 2012-07-05 | Control method and device of PFC circuit, PFC circuit and digital power supply |
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| 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 |
| CN114123757A (en) * | 2021-11-24 | 2022-03-01 | 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 |
| 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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