CN112803748A - Fixed feedforward control method for power factor correction circuit - Google Patents

Fixed feedforward control method for power factor correction circuit Download PDF

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Publication number
CN112803748A
CN112803748A CN202110124063.8A CN202110124063A CN112803748A CN 112803748 A CN112803748 A CN 112803748A CN 202110124063 A CN202110124063 A CN 202110124063A CN 112803748 A CN112803748 A CN 112803748A
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duty ratio
adjustment value
value
adjusting
adjustment
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CN202110124063.8A
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CN112803748B (en
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朱丹阳
叶忠
韩启祥
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Inventchip Technology Co ltd
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Inventchip Technology Co ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

The present disclosure relates to a method of fixed feed forward control of a power factor correction circuit, the method comprising: determining an adjusting mode for adjusting the first duty ratio adjusting value according to the magnitude relation between the first duty ratio adjusting value and the adjusting threshold value, adjusting the first duty ratio adjusting value by using the determined adjusting mode to obtain a second duty ratio adjusting value, operating the second duty ratio adjusting value and the first duty ratio adjusting value to obtain a third duty ratio adjusting value, and adjusting the duty ratio of the feedforward voltage signal by using the third duty ratio adjusting value and a preset adjusting value to obtain an adjusted voltage signal; and generating a control signal according to the adjusted voltage signal to control the power factor correction circuit to carry out power factor correction on the input alternating current. Through the method, the embodiment of the disclosure can reduce PFC output fluctuation, improve output stability and accuracy, improve dynamic characteristics of a current loop, reduce control complexity, and save operation resources and circuit resources.

Description

Fixed feedforward control method for power factor correction circuit
Technical Field
The present disclosure relates to the field of integrated circuit technologies, and in particular, to a fixed feedforward control method for a power factor correction circuit.
Background
The application of the power electronic technology can greatly improve the power density of the electric energy conversion device and effectively reduce the volume and the weight of the device. With the rapid development of power electronic technology, power electronic devices are more and more, almost every power electronic device needs to convert alternating current into direct current through a rectification conversion technology, and in order to reduce the mutual influence of load harmonics on a power grid and other devices, the input current harmonic content and power density of every electronic device need to meet the current harmonic requirements of alternating current electric equipment. Therefore, it is important to research a PFC (Power Factor correction) converter with high efficiency and high Power density.
In the related art, when the PFC converter is controlled, the adopted control methods are complex, occupy more operation resources and circuit resources, and in some control stages, the problems that the PFC converter cannot work stably due to large output fluctuation of the PFC are solved.
Disclosure of Invention
In view of the above, the present disclosure provides a fixed feedforward control method for a power factor correction circuit, so as to reduce PFC output fluctuation, improve output stability and accuracy, reduce control complexity, and save operation resources and circuit resources, the method being applied to a control device for controlling the power factor correction circuit to perform power factor correction on input ac power and generate an output voltage, wherein the control device includes a current loop module, the current loop module includes an error amplifier, the error amplifier is configured to determine a first duty ratio adjustment value according to a target current and a detected current of the power factor correction circuit, and the method includes:
determining an adjusting mode for adjusting the first duty ratio adjusting value according to the magnitude relation between the first duty ratio adjusting value and an adjusting threshold value, wherein the adjusting mode comprises a linear adjusting mode and a nonlinear adjusting mode;
adjusting the first duty ratio adjustment value by using the determined adjustment mode to obtain a second duty ratio adjustment value;
calculating the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value;
adjusting the duty ratio of a feedforward voltage signal obtained according to the alternating voltage of the input alternating current by using the third duty ratio adjustment value and a preset adjustment value to obtain an adjusted voltage signal;
and generating a control signal according to the adjusted voltage signal to control a power factor correction circuit to carry out power factor correction on the input alternating current.
In a possible implementation manner, the determining, according to a magnitude relationship between the first duty ratio adjustment value and an adjustment threshold, an adjustment manner for adjusting the first duty ratio adjustment value includes:
when the first duty ratio adjustment value is larger than the adjustment threshold value, determining that an adjustment mode for adjusting the first duty ratio adjustment value is a nonlinear adjustment mode; or
When the first duty ratio adjustment value is smaller than the adjustment threshold value, determining that an adjustment mode for adjusting the first duty ratio adjustment value is a linear adjustment mode.
In a possible implementation manner, when the determined adjustment manner is a non-linear adjustment manner, the adjusting the first duty ratio adjustment value by using the determined adjustment manner to obtain a second duty ratio adjustment value includes:
and amplifying the difference between the first duty ratio adjustment value and the adjustment threshold value by a preset amplification factor to obtain a second duty ratio adjustment value.
In a possible implementation manner, the amplifying, by a preset amplification factor, a difference between the first duty ratio adjustment value and the adjustment threshold to obtain the second duty ratio adjustment value includes:
amplifying the difference between the first duty cycle adjustment value and the adjustment threshold value by using an amplifier to obtain a second duty cycle adjustment value,
wherein the amplification factor of the amplifier is the preset amplification factor,
the adjustment threshold is an arbitrary value which is larger than the preset adjustment value and smaller than 0.9, the preset amplification factor is larger than 1, and the preset adjustment value is an arbitrary value between 0.2 and 0.8.
In a possible implementation manner, the adjustment threshold is 0.75, and the preset adjustment value is 0.5.
In a possible implementation manner, when the determined adjustment manner is a linear adjustment manner, the adjusting the first duty ratio adjustment value by using the determined adjustment manner to obtain a second duty ratio adjustment value includes:
setting the second duty cycle adjustment value to 0.
In a possible implementation manner, the calculating the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value includes:
and performing summation operation on the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value.
In one possible implementation, the method further includes:
and carrying out proportional operation on the alternating voltage of the input alternating current according to a preset proportion to obtain the feedforward voltage signal.
In a possible implementation manner, the adjusting, by using the third duty ratio adjustment value and the preset adjustment value, the duty ratio of a feedforward voltage signal obtained according to an ac voltage of an input ac power to obtain an adjusted voltage signal includes:
performing difference operation on the third duty ratio adjustment value and the preset adjustment value to obtain a fourth duty ratio adjustment value;
and performing summation operation on the fourth duty ratio adjustment value and the feedforward voltage signal to adjust the duty ratio of the feedforward voltage signal to obtain an adjusted voltage signal.
In one possible implementation, the control device further includes:
the voltage loop module is used for outputting power related parameters according to the output voltage of the power factor correction circuit and the reference voltage, and the power related parameters are related to the power of the power factor correction circuit;
the target current determining module is electrically connected to the voltage loop module and used for determining the target current according to the alternating voltage of the input alternating current and the power related parameters;
the current loop module is electrically connected to the target current determination module and is used for obtaining the third duty ratio adjustment value according to the target current and the detection current of the power factor correction circuit;
the voltage adjusting module is electrically connected to the current loop module and is used for calculating the alternating current voltage of the input alternating current to obtain the feedforward voltage signal, and adjusting the duty ratio of the feedforward voltage signal by using the third duty ratio adjusting value and a preset adjusting value to obtain an adjusted voltage signal;
and the signal generating module is electrically connected with the voltage adjusting module and used for generating a control signal according to the adjusted voltage signal.
In the fixed feedforward control method of the power factor correction circuit in the embodiment of the disclosure, in a process of generating a control signal, an adjustment mode for adjusting a first duty ratio adjustment value is determined according to a magnitude relation between the first duty ratio adjustment value and an adjustment threshold value output by an error amplifier of a current loop module, so that the adjustment mode is determined according to the magnitude of the first duty ratio adjustment value for performing segmented adjustment, thereby avoiding a large current peak caused by runaway of a current loop, after the adjustment mode is determined, the first duty ratio adjustment value is adjusted by using the determined adjustment mode to obtain a second duty ratio adjustment value, the second duty ratio adjustment value is operated with the first duty ratio adjustment value to obtain a third duty ratio adjustment value, and the duty ratio of a feedforward voltage signal obtained according to an alternating voltage of an input alternating current is adjusted by using the third duty ratio adjustment value and a preset adjustment value, the adjusted voltage signal is obtained, and the duty ratio of the control signal is directly related to the alternating current voltage, so that the embodiment of the disclosure adopts a fixed feedforward mode to control the PFC, generates the control signal according to the adjusted voltage signal to control the power factor correction circuit to perform power factor correction on the input alternating current so as to quickly respond to the change of the alternating current, and selects the duty ratio adjustment mode to perform segmented adjustment on the duty ratio according to the actual situation, so that the current loop can be prevented from being out of control, the output fluctuation of the PFC can be reduced, the stability and the accuracy of the output can be improved, the dynamic characteristic of the current loop can be improved, the control complexity can be reduced, and the operation resources and the circuit resources can be saved.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a flow chart of a method of fixed feed forward control of a power factor correction circuit according to an embodiment of the present disclosure.
FIG. 2 shows a partial schematic view of a control device according to an embodiment of the present disclosure.
FIG. 3 shows a schematic diagram of a control device according to an embodiment of the present disclosure.
Fig. 4 shows a schematic diagram of a power factor correction circuit according to an embodiment of the present disclosure.
Fig. 5 shows a schematic diagram of a power factor correction circuit according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Referring to fig. 1, fig. 1 is a flow chart illustrating a fixed feedforward control method of a pfc circuit according to an embodiment of the present disclosure.
The method is applied to a control device, which is used for controlling a power factor correction circuit to perform power factor correction on input alternating current and generate an output voltage, wherein the control device comprises a current loop module, the current loop module comprises an error amplifier, and the error amplifier is used for determining a first duty ratio adjustment value according to a target current and a detection current of the power factor correction circuit, as shown in fig. 1, and the method comprises the following steps:
step S11, determining an adjusting mode for adjusting the first duty ratio adjusting value according to the magnitude relation between the first duty ratio adjusting value and an adjusting threshold value, wherein the adjusting mode comprises a linear adjusting mode and a nonlinear adjusting mode;
step S12, adjusting the first duty ratio adjustment value by using the determined adjustment mode to obtain a second duty ratio adjustment value;
step S13, calculating the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value;
step S14, adjusting the duty ratio of a feedforward voltage signal obtained according to the alternating voltage of the input alternating current by using the third duty ratio adjustment value and a preset adjustment value to obtain an adjusted voltage signal;
and step S15, generating a control signal according to the adjusted voltage signal to control the power factor correction circuit to perform power factor correction on the input alternating current.
In the fixed feedforward control method of the power factor correction circuit in the embodiment of the disclosure, in a process of generating a control signal, an adjustment mode for adjusting a first duty ratio adjustment value is determined according to a magnitude relation between the first duty ratio adjustment value and an adjustment threshold value output by an error amplifier of a current loop module, so that the adjustment mode is determined according to the magnitude of the first duty ratio adjustment value for performing segmented adjustment, thereby avoiding a large current peak caused by runaway of a current loop, after the adjustment mode is determined, the first duty ratio adjustment value is adjusted by using the determined adjustment mode to obtain a second duty ratio adjustment value, the second duty ratio adjustment value is operated with the first duty ratio adjustment value to obtain a third duty ratio adjustment value, and the duty ratio of a feedforward voltage signal obtained according to an alternating voltage of an input alternating current is adjusted by using the third duty ratio adjustment value and a preset adjustment value, the adjusted voltage signal is obtained, and the duty ratio of the control signal is directly related to the alternating current voltage, so that the embodiment of the disclosure adopts a fixed feedforward mode to control the PFC, generates the control signal according to the adjusted voltage signal to control the power factor correction circuit to perform power factor correction on the input alternating current so as to quickly respond to the change of the alternating current, and selects the duty ratio adjustment mode to perform segmented adjustment on the duty ratio according to the actual situation, so that the current loop can be prevented from being out of control, the output fluctuation of the PFC can be reduced, the stability and the accuracy of the output can be improved, the dynamic characteristic of the current loop can be improved, the control complexity can be reduced, and the operation resources and the circuit resources can be saved.
It should be noted that, the embodiment of the present disclosure does not limit the specific implementation manner of the control device, and a person skilled in the art may refer to the related art to implement the control device and each module in the control device.
Possible implementations of the steps of the fixed feedforward control method of the power factor correction circuit are exemplarily described below.
In a possible implementation manner, the step S11, determining, according to a magnitude relationship between the first duty ratio adjustment value and an adjustment threshold, an adjustment manner for adjusting the first duty ratio adjustment value may include:
when the first duty ratio adjustment value is larger than the adjustment threshold value, determining that an adjustment mode for adjusting the first duty ratio adjustment value is a nonlinear adjustment mode; or
When the first duty ratio adjustment value is smaller than the adjustment threshold value, determining that an adjustment mode for adjusting the first duty ratio adjustment value is a linear adjustment mode.
In one example, the non-linear adjustment manner may include an adjustment manner in which the first duty ratio adjustment value is amplified, and the linear adjustment manner may include a manner in which the first duty ratio adjustment value is not amplified.
In a possible implementation manner, when the determined adjustment manner is a non-linear adjustment manner, the step S12 of adjusting the first duty ratio adjustment value by using the determined adjustment manner to obtain a second duty ratio adjustment value may include:
and amplifying the difference between the first duty ratio adjustment value and the adjustment threshold value by a preset amplification factor to obtain a second duty ratio adjustment value.
In a possible implementation manner, the amplifying, by a preset amplification factor, a difference between the first duty ratio adjustment value and the adjustment threshold to obtain the second duty ratio adjustment value may include:
and amplifying the difference between the first duty ratio adjustment value and the adjustment threshold value by using an amplifier to obtain a second duty ratio adjustment value.
In an example, a nonlinear adjustment manner may be applied to a power-on period of the PFC, when the PFC powers up, since the embodiment of the present disclosure adopts a fixed feed-forward manner, an output voltage (for example, 100V more) of the PFC is much lower than a target output voltage (for example, 400V), and therefore, the first duty ratio adjustment value may not meet a required target duty ratio requirement, in this case, current runaway may be caused, which may cause unstable and large fluctuation of the PFC, and the current runaway may be avoided through the nonlinear adjustment manner.
In one example, assuming that the target PFC output voltage is 400V, the input range of the AC voltage of the input AC power is from 60Vrms to 265Vrms, which corresponds to 92V to 375V of the peak AC voltage of the input AC voltage, and the target duty ratio Doff of the corresponding control signal is in the range of 23% to 93%.
In one example, assuming input voltages of 110Vrms and 220Vrms, corresponding to AC peak voltages 155V and 311V, the corresponding target duty cycles Doff are around 39% and 78%.
In one example, the first duty ratio adjustment value (current command) operating range is 0 to 100%, the maximum positive and negative adjustment range for the first duty ratio adjustment value Doff _ err is set to 50%, and when the first duty ratio adjustment value is smaller than the adjustment threshold, the target duty ratio Doff of the control signal is:
doff-ff + Doff _ err-50% formula 1
Wherein Doff _ ff is the duty cycle of the feedforward voltage signal, and Doff _ err is the required third duty cycle adjustment value.
Taking the input ac voltage as 110Vrms as an example, when the ac peak voltage is 155V, the corresponding fixed feedforward signal Doff _ ff is 39%, and if the duty ratio Doff of the control signal is 39%, it is necessary to: doff _ err is 50%;
taking an input ac voltage of 220Vrms as an example, when the ac peak voltage is 311V, the corresponding fixed feedforward signal Doff _ ff is 78%, and if the duty ratio Doff of the control signal is required to be 78%, it is necessary to: doff _ err is 50%.
Therefore, when the first duty ratio adjustment value is smaller than the adjustment threshold, stable control can be realized by using the formula 1.
However, when the PFC circuit is turned on with the input ac voltage 110Vrms, and if Vout is 160V when Vin is 155V, the target duty ratio Doff required for the normal operation of the PFC circuit is 97% Vin/Vout, and Doff _ ff is 39% Vin/400, even if Doff _ err reaches the maximum value of 100%, the Doff is only 39% + 100% -50% + 89%, that is, Doff cannot reach the required duty ratio, and the current loop is out of control.
Therefore, when the first duty ratio adjustment value is greater than the adjustment threshold, the duty ratio Doff of the control signal of the embodiment of the present disclosure is:
doff-ff + N (Doff _ err-T1) + Doff _ err-T2 formula 2
Wherein N represents the preset magnification, T1 represents the adjustment threshold, T2 represents the preset adjustment value, and N is greater than 1.
Of course, the non-linear adjustment mode may also be applied to other scenarios as long as the first duty cycle adjustment value is greater than the adjustment threshold.
In a possible implementation manner, when the determined adjustment manner is a linear adjustment manner, the step S12 of adjusting the first duty ratio adjustment value by using the determined adjustment manner to obtain a second duty ratio adjustment value may include: setting the second duty cycle adjustment value to 0.
In one example, the linear adjustment manner may correspond to a PFC stable operating state.
A possible implementation of determining the second duty ratio adjustment value by using a linear adjustment manner or a non-linear adjustment manner is exemplarily described below.
Referring to fig. 2, fig. 2 is a partial schematic diagram of a control device according to an embodiment of the disclosure.
In one example, as shown in fig. 2, the Current loop module of the control device may include an Error Amplifier (EA) 2701, which in one example may be a Current Error Amplifier (CEA).
In one example, one input terminal (e.g., a positive input terminal) of the EA 2701 may be used to input the target current Im, and another input terminal (e.g., a negative input terminal) may be used to input a detection current Iac (e.g., an inductor current of the PFC), and the EA 2701 may generate a first duty ratio adjustment value using the target current Im and the detection current Iac, and the first duty ratio adjustment value is related to the current.
In one example, a parameter of the EA 2701 may be set, for example, a bias parameter OFFSET of the EA 2701 is set, so that a first duty ratio adjustment value of the output of the EA 2701 is 0.5 (50%) or close to 0.5 at a steady state, so that the adjustment value has a maximum positive and negative adjustment range, thereby improving stability and adaptability of current loop control.
Of course, the above description of EA 2701 for the current loop module is exemplary and should not be considered as limiting the embodiments of the present disclosure.
In one example, the current loop module may further include a processing component 2702 to enable adjustment of the first duty cycle adjustment value output by the EA 2701 according to various adjustment approaches.
In one example, as shown in fig. 2, the processing component 2702 may include two inputs, one of which is used for inputting the first duty cycle adjustment value Doff _ err, and the other of which is used for inputting the adjustment threshold T1, for example, 0.75 (75%).
In one example, the processing component 2702 may be provided with a comparator for comparing the first duty ratio adjustment value with an adjustment threshold T1, and when the comparison result is that the first duty ratio adjustment value is greater than the adjustment threshold T1, the first duty ratio adjustment value may be adjusted by using a non-linear adjustment manner, otherwise, the first duty ratio adjustment value is adjusted by using a linear adjustment manner.
In one example, the processing component 2702 may include an adder, and when the first duty cycle adjustment value is greater than the adjustment threshold T1, a difference operation of the first duty cycle adjustment value and the adjustment threshold T1 may be implemented by the adder to obtain a difference between the first duty cycle adjustment value and the adjustment threshold T1 (Doff _ err-T1).
In one example, the processing component 2702 can include an amplifier.
In one example, the amplification of the amplifier is the preset amplification, which may be greater than 1, for example.
The specific amplification factor of the amplifier is not limited in the embodiments of the present disclosure, and those skilled in the art may perform adaptive configuration according to actual conditions or needs, as long as it is ensured that the current loop is not saturated and can be stable in the nonlinear adjustment stage (e.g., the startup stage).
For example, assuming that the ac voltage Vin of the input ac is 60Vrms, the peak value of the corresponding ac voltage is 85V, the target duty cycle of the control signal is close to Doff being 100%, and the duty cycle Doff _ ff of the feedforward voltage signal is 21%, the required third duty cycle adjustment value Doff _1 is 100% -21% + 50% + 129%, that is, the first duty cycle adjustment value Doff _ err output by the error amplifier of the current loop module is to reach 129% after being adjusted, and if the adjustment threshold T1 is 75%, N > (129% -75%)/(100% -75%) is 2.16, that is, as long as N is greater than 2.16, the PFC can be kept stable in a non-linear stage such as a startup stage, and the current loop module is prevented from running away.
In one example, when the first duty ratio adjustment value is greater than the adjustment threshold T1, the amplifier may perform amplification processing of a preset amplification factor on a difference between the first duty ratio adjustment value and the adjustment threshold T1 to obtain a second duty ratio adjustment value: n (Doff _ err-T1).
In one example, when the comparison result is that the first duty cycle adjustment value is less than the adjustment threshold T1, the processing component 2702 may determine the second duty cycle adjustment value in a linear adjustment manner, e.g., set the second duty cycle adjustment value to 0.
In one example, the adjustment threshold may be any value greater than the preset adjustment value and less than 0.9, and the preset adjustment value may be any value between 0.2 and 0.8.
In one example, the adjustment threshold is preferably 0.75, and the preset adjustment value is preferably 0.5.
In a possible implementation manner, the step S13 of calculating the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value may include:
and summing the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value (N x (Doff _ err-T1) + Doff _ err or Doff _ err).
In one example, as shown in fig. 2, the current loop module may include an adder 2702, and the embodiment of the disclosure may sum the second duty ratio adjustment value and the first duty ratio adjustment value by using the adder to obtain a third duty ratio adjustment value.
In a possible implementation manner, the step S14 of adjusting the duty ratio Doff _ ff of a feedforward voltage signal obtained according to the input ac voltage of the ac power by using the third duty ratio adjustment value and the preset adjustment value to obtain an adjusted voltage signal includes:
performing a difference operation on the third duty ratio adjustment value and the preset adjustment value to obtain a fourth duty ratio adjustment value (N x (Doff _ err-T1) + Doff _ err-T2 or Doff _ err-T2);
and summing the fourth duty ratio adjustment value and the feedforward voltage signal to adjust the duty ratio of the feedforward voltage signal (formula 1 or formula 2) to obtain an adjusted voltage signal.
In an example, as shown in fig. 2, the apparatus may further include an adder 2802, and an embodiment of the present disclosure may implement, by using the adder 2802, that the duty ratio of a feedforward voltage signal obtained according to the ac voltage of the input ac power is adjusted by using the third duty ratio adjustment value and the preset adjustment value, so as to obtain an adjusted voltage signal.
For example, in the embodiment of the present disclosure, the adder 2802 may perform a difference operation on the third duty ratio adjustment value and the preset adjustment value to obtain a fourth duty ratio adjustment value, and the adder 2802 may perform a sum operation on the fourth duty ratio adjustment value and the feedforward voltage signal to adjust the duty ratio of the feedforward voltage signal to obtain an adjusted voltage signal.
It should be noted that, in the embodiment of the present disclosure, another adder (which may be disposed in the current loop module) may be further disposed between the adder 2703 and the adder 2802, so as to implement a difference operation between the third duty ratio adjustment value and the preset adjustment value, and obtain a fourth duty ratio adjustment value; and an adder 2802 is used to sum the fourth duty ratio adjustment value and the feedforward voltage signal to adjust the duty ratio of the feedforward voltage signal, so as to obtain an adjusted voltage signal.
In one possible implementation, the method may further include:
and carrying out proportional operation on the alternating voltage of the input alternating current according to a preset proportion to obtain the feedforward voltage signal.
In one example, as shown in fig. 2, the apparatus may further include a scaling component 2801, and the scaling component 2801 may implement a scaling operation on an input signal or input data.
In one example, the scaling component 2801 can include a scaling circuit configured to scale an input by 1/K, where K can be greater than 1, e.g., can be 200, 400, etc.
The embodiment of the disclosure realizes the proportional operation of the input alternating voltage through the proportional circuit, and compared with the method of utilizing a divider in the related art, the embodiment of the disclosure can reduce the cost, reduce the circuit area and save the operation resources.
In the following, possible implementations of the control device are exemplarily described.
Referring to fig. 3, fig. 3 is a schematic diagram of a control device according to an embodiment of the disclosure.
In one possible implementation, as shown in fig. 3, the control device may include:
the voltage loop module 250 is configured to output a power related parameter according to the sampling voltage Vo and the reference voltage Vref, where the power related parameter P is related to the power of the power factor correction circuit;
a target current determining module 260 electrically connected to the voltage loop module 250, for determining a target current according to the ac voltage Vac of the input ac power and the power related parameter P;
a current loop module 270, electrically connected to the target current determining module 260, configured to obtain the third duty ratio adjustment value according to the target current and a detection current Iac of the power factor correction circuit, where the third duty ratio adjustment value is used to adjust a duty ratio of a control signal;
a voltage adjusting module 280, electrically connected to the current loop module 270, configured to perform an operation on an ac voltage of an input ac power to obtain the feed-forward voltage signal, and adjust a duty ratio of the feed-forward voltage signal by using the third duty ratio adjustment value and a preset adjustment value to obtain an adjusted voltage signal;
the signal generating module 290 is electrically connected to the voltage adjusting module 280, and is configured to generate a control signal according to the adjusted voltage signal.
It should be noted that, the embodiment of the present disclosure does not limit the specific implementation manner of obtaining the ac voltage Vac and the ac current Iac, and those skilled in the art can implement the methods by using the related art.
In one example, the voltage loop module 250 may include a comparator, an error amplifier EA, and the like, and may be configured to generate a power-related parameter related to the power value, and the embodiment of the present disclosure does not limit the specific implementation manner of the voltage loop module 10.
In one example, the target current determination module 260 may include a multiplier (e.g., a two-input multiplier), and the target current determination module 260 may be utilized to determine the target current according to the embodiments of the present disclosure, and the specific implementation manner of the target current determination module 260 is not limited by the embodiments of the present disclosure.
In an example, the current loop module 270 may include an error amplifier 2701, a processing component 2702, an adder 2703, and the like shown in fig. 2, so as to determine the third duty ratio adjustment value according to the target current and the detection current of the power factor correction circuit, and the embodiment of the present disclosure does not limit the manner of detecting the detection current of the power factor correction circuit, and the embodiment of the present disclosure does not limit the specific implementation manner of the current loop module.
In an example, the voltage adjustment module 280 may include a proportional operation component 2801 (please refer to fig. 2), an adder 2802, and the like, and the voltage adjustment module 280 may multiply the ac voltage by a preset coefficient to obtain an operated voltage, and implement an addition operation or a subtraction operation between the operated voltage and the third duty ratio adjustment value by using the adder to adjust the duty ratio of the operated voltage by using the third duty ratio adjustment value, and the embodiment of the present disclosure does not limit a specific implementation manner of the voltage adjustment module 40.
According to the embodiment of the disclosure, the ac voltage is multiplied by a preset proportionality coefficient through a proportionality circuit of the proportionality operation component 2801 to obtain a feedforward voltage signal so as to directly adjust the duty ratio of a control signal, so that fixed feedforward control of PFC is realized, and on one hand, dynamic response can be accelerated, so that the duty ratio of the control signal can quickly respond to the change of the input ac power; on the other hand, the multiplier in the target current determination module 260 can be changed from a three-input multiplier to a two-input multiplier, the implementation manner of the target current determination module 260 becomes simpler, circuit resources are saved, the signal swing of the input signal of the multiplier becomes small, the effective bandwidth and the dynamic characteristic of the current loop module are improved, and the performance of the PFC circuit is improved.
In an example, the signal generating module 290 may generate a pulse width modulation PWM signal (control signal) by using a triangular wave (or a sawtooth wave) and the adjusted voltage, for example, the signal generating module 290 may use a comparator to compare the adjusted voltage and the triangular wave to generate the PWM signal, and of course, the specific implementation manner of the signal generating module is not limited in the embodiment of the present disclosure.
The embodiment of the present disclosure does not limit the possible implementation manners of each module of the control device, and those skilled in the art can determine the implementation manners as needed.
A possible implementation of the power factor correction circuit is exemplarily described below.
It should be noted that the power factor correction circuit 10 in the embodiment of the present disclosure may include various types of PFC circuits, for example, a bridge PFC or a bridgeless totem pole PFC, and the specific implementation manner of the power factor correction circuit 10 is not limited in the embodiment of the present disclosure.
Referring to fig. 4, fig. 4 is a schematic diagram of a power factor correction circuit according to an embodiment of the disclosure.
In one possible implementation, as shown in fig. 4, the power factor correction circuit may include a zeroth diode D0, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first inductor L1, a first capacitor C1, and a first transistor Q1, wherein,
a positive terminal of the first diode D1 is electrically connected to a negative terminal of the second diode D2 and a first terminal of an alternating current power source AC, a negative terminal of the first diode D1 is electrically connected to a negative terminal of the third diode D3 and a first terminal of the first inductor L1, the alternating current power source AC is used for outputting alternating current,
a positive terminal of the third diode D3 is electrically connected to a negative terminal of the fourth diode D4 and a second terminal of the AC power source AC,
a second end of the first inductor L1 is electrically connected to the positive end of the zeroth diode D0 and the drain of the first transistor Q1,
the negative terminal of the zeroth diode D0 is electrically connected to the first terminal of the first capacitor C1 for outputting the output voltage Vo to power the load RL,
the gate of the first transistor Q1 is used to receive the control signal,
a positive terminal of the second diode D2, a positive terminal of the fourth diode D4, a source of the first transistor Q1, and a second terminal of the first capacitor C1 are grounded.
In one example, an EMI filtering module may be disposed between the ac power supply and the correction circuit to reduce electromagnetic interference EMI, and a specific implementation manner of the EMI filtering module is not limited in the embodiment of the present disclosure, and a person skilled in the art may implement the EMI filtering module by using related technologies as needed.
In one example, the detection current of the power factor correction circuit may be the inductor current Iac of the first inductor L1.
The above description of the bridged PFC is exemplary and should not be considered as a limitation on the embodiments of the present disclosure, and in other embodiments, the bridged PFC may also include other implementations.
Referring to fig. 5, fig. 5 is a schematic diagram of a power factor correction circuit according to an embodiment of the disclosure.
In one possible implementation, as shown in fig. 5, the power factor correction circuit may include a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, a second inductor L2, and a second capacitor C2, wherein,
a source of the third transistor Q3 is electrically connected to a drain of the fourth transistor Q4 and a first end of an alternating current power source AC for outputting alternating current power,
the drain of the third transistor Q3 is electrically connected to the drain of the second transistor Q2 and the first end of the second capacitor C2, and is used for outputting the output voltage Vo to drive the load RL,
a first end of the second inductor L2 is electrically connected to the second end of the AC power source AC, a second end of the second inductor L2 is electrically connected to the source of the second transistor Q2 and the drain of the fifth transistor Q5,
the gate of the second transistor Q2, the gate of the third transistor Q3, the gate of the fourth transistor Q4, the gate of the fifth transistor Q5 are used for receiving the control signal,
the source of the fourth transistor Q4, the source of the fifth transistor Q5, and the second terminal of the second capacitor C2 are grounded.
In one example, the detection current of the power factor correction circuit may be the inductor current Iac of the second inductor L2.
The above description of the bridgeless PFC is exemplary and should not be considered as a limitation on the embodiments of the present disclosure, and in other embodiments, the bridgeless PFC may also include other implementations.
In the fixed feedforward control method of the power factor correction circuit in the embodiment of the disclosure, in a process of generating a control signal, an adjustment mode for adjusting a first duty ratio adjustment value is determined according to a magnitude relation between the first duty ratio adjustment value and an adjustment threshold value output by an error amplifier of a current loop module, so that the adjustment mode is determined according to the magnitude of the first duty ratio adjustment value for performing segmented adjustment, thereby avoiding a large current peak caused by runaway of a current loop, after the adjustment mode is determined, the first duty ratio adjustment value is adjusted by using the determined adjustment mode to obtain a second duty ratio adjustment value, the second duty ratio adjustment value is operated with the first duty ratio adjustment value to obtain a third duty ratio adjustment value, and the duty ratio of a feedforward voltage signal obtained according to an alternating voltage of an input alternating current is adjusted by using the third duty ratio adjustment value and a preset adjustment value, the adjusted voltage signal is obtained, and the duty ratio of the control signal is directly related to the alternating current voltage, so that the embodiment of the disclosure adopts a fixed feedforward mode to control the PFC, generates the control signal according to the adjusted voltage signal to control the power factor correction circuit to perform power factor correction on the input alternating current so as to quickly respond to the change of the alternating current, and selects the duty ratio adjustment mode to perform segmented adjustment on the duty ratio according to the actual situation, so that the current loop can be prevented from being out of control, the output fluctuation of the PFC can be reduced, the stability and the accuracy of the output can be improved, the dynamic characteristic of the current loop can be improved, the control complexity can be reduced, and the operation resources and the circuit resources can be saved.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. A fixed feedforward control method for a power factor correction circuit, the method being applied to a control device for controlling the power factor correction circuit to perform power factor correction on an input alternating current and generate an output voltage, wherein the control device includes a current loop module including an error amplifier for determining a first duty ratio adjustment value according to a target current and a detected current of the power factor correction circuit, the method comprising:
determining an adjusting mode for adjusting the first duty ratio adjusting value according to the magnitude relation between the first duty ratio adjusting value and an adjusting threshold value, wherein the adjusting mode comprises a linear adjusting mode and a nonlinear adjusting mode;
adjusting the first duty ratio adjustment value by using the determined adjustment mode to obtain a second duty ratio adjustment value;
calculating the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value;
adjusting the duty ratio of a feedforward voltage signal obtained according to the alternating voltage of the input alternating current by using the third duty ratio adjustment value and a preset adjustment value to obtain an adjusted voltage signal;
and generating a control signal according to the adjusted voltage signal to control a power factor correction circuit to carry out power factor correction on the input alternating current.
2. The method of claim 1, wherein determining an adjustment manner for adjusting the first duty cycle adjustment value according to a magnitude relationship between the first duty cycle adjustment value and an adjustment threshold value comprises:
when the first duty ratio adjustment value is larger than the adjustment threshold value, determining that an adjustment mode for adjusting the first duty ratio adjustment value is a nonlinear adjustment mode; or
When the first duty ratio adjustment value is smaller than the adjustment threshold value, determining that an adjustment mode for adjusting the first duty ratio adjustment value is a linear adjustment mode.
3. The method of claim 1, wherein when the determined adjustment mode is a non-linear adjustment mode, the adjusting the first duty cycle adjustment value by using the determined adjustment mode to obtain a second duty cycle adjustment value comprises:
and amplifying the difference between the first duty ratio adjustment value and the adjustment threshold value by a preset amplification factor to obtain a second duty ratio adjustment value.
4. The method of claim 3, wherein amplifying the difference between the first duty cycle adjustment value and the adjustment threshold by a preset amplification factor to obtain the second duty cycle adjustment value comprises:
amplifying the difference between the first duty cycle adjustment value and the adjustment threshold value by using an amplifier to obtain a second duty cycle adjustment value,
wherein the amplification factor of the amplifier is the preset amplification factor,
the adjustment threshold is an arbitrary value which is larger than the preset adjustment value and smaller than 0.9, the preset amplification factor is larger than 1, and the preset adjustment value is an arbitrary value between 0.2 and 0.8.
5. The method of claim 4, wherein the adjustment threshold is 0.75 and the preset adjustment value is 0.5.
6. The method of claim 1, wherein when the determined adjustment mode is a linear adjustment mode, the adjusting the first duty ratio adjustment value by using the determined adjustment mode to obtain a second duty ratio adjustment value comprises:
setting the second duty cycle adjustment value to 0.
7. The method of claim 1, wherein the operating the second duty cycle adjustment value with the first duty cycle adjustment value to obtain a third duty cycle adjustment value comprises:
and performing summation operation on the second duty ratio adjustment value and the first duty ratio adjustment value to obtain a third duty ratio adjustment value.
8. The method of claim 1, further comprising:
and carrying out proportional operation on the alternating voltage of the input alternating current according to a preset proportion to obtain the feedforward voltage signal.
9. The method of claim 1, wherein the adjusting the duty ratio of the feedforward voltage signal obtained according to the ac voltage of the input ac power by using the third duty ratio adjustment value and the preset adjustment value to obtain the adjusted voltage signal comprises:
performing difference operation on the third duty ratio adjustment value and the preset adjustment value to obtain a fourth duty ratio adjustment value;
and performing summation operation on the fourth duty ratio adjustment value and the feedforward voltage signal to adjust the duty ratio of the feedforward voltage signal to obtain an adjusted voltage signal.
10. The method of claim 1, wherein the control device further comprises:
the voltage loop module is used for outputting power related parameters according to the output voltage of the power factor correction circuit and the reference voltage, and the power related parameters are related to the power of the power factor correction circuit;
the target current determining module is electrically connected to the voltage loop module and used for determining the target current according to the alternating voltage of the input alternating current and the power related parameters;
the current loop module is electrically connected to the target current determination module and is used for obtaining the third duty ratio adjustment value according to the target current and the detection current of the power factor correction circuit;
the voltage adjusting module is electrically connected to the current loop module and is used for calculating the alternating current voltage of the input alternating current to obtain the feedforward voltage signal, and adjusting the duty ratio of the feedforward voltage signal by using the third duty ratio adjusting value and a preset adjusting value to obtain an adjusted voltage signal;
and the signal generating module is electrically connected with the voltage adjusting module and used for generating a control signal according to the adjusted voltage signal.
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