CN111725988A - Load current feedforward control method based on single-cycle control and PFC controller - Google Patents

Load current feedforward control method based on single-cycle control and PFC controller Download PDF

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Publication number
CN111725988A
CN111725988A CN202010509445.8A CN202010509445A CN111725988A CN 111725988 A CN111725988 A CN 111725988A CN 202010509445 A CN202010509445 A CN 202010509445A CN 111725988 A CN111725988 A CN 111725988A
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control
load current
load
current
signal
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张逸云
王慧贞
路通
宋洁
黄泽雷
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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

Abstract

The invention discloses a load current feedforward control method based on single-cycle control and a PFC controller, belonging to the technical field of power factor correction converters. The invention is mainly applied to the Boost PFC converter, and obviously improves the dynamic response speed of the converter under the advantage of ensuring simple and effective single-period control.

Description

Load current feedforward control method based on single-cycle control and PFC controller
Technical Field
The present invention relates to a single-cycle control method, and more particularly, to a load current feedforward control method based on single-cycle control and a PFC controller.
Background
The single-Cycle Control technology (One-Cycle Control) is a large-signal nonlinear Control method proposed by american Smedley k.m. in the last 90 th century, and is used for DC-DC direct-current converters at first, the basic idea of single-Cycle Control is to Control the duty ratio of switches in a circuit, so that the average value of switch variables in each Cycle is equal to or proportional to a Control reference, and the purpose of the equal or proportional relationship between the average value and the Control quantity is to automatically eliminate transient errors in One switching Cycle, so that the errors in the previous Cycle cannot be brought to the next Cycle. The single-cycle control has the characteristics of high response speed, good robustness, adaptability and the like.
In recent years, the application of single-cycle control to PFC technology is becoming wider and wider, and with the development of digital control, compared with control strategies such as an average current method, the single-cycle control is increasingly applied to digital control by using a simpler algorithm and a convenient parameter adjustment mode, and the core control equation is d ═ (V ═ V)m-IgRs)/VmWhere d is the PWM wave duty cycle, VmFor voltage loop output, RsThe inductance current sampling coefficient.
The classical single-period PFC controller mainly adjusts dynamic performance through PI parameters of a voltage loop, in order to avoid interference caused by secondary ripples of output voltage, the voltage loop crossing frequency is generally selected to be below twice power frequency, and in order to restrain the output voltage ripples, an output capacitor is generally large in capacity, so that the dynamic response of a converter is slow, and the classical single-period PFC controller is difficult to apply on occasions with large load variation.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention provides a load current feedforward control method based on single-cycle control and a PFC controller, which can obviously improve the dynamic response speed of a PFC converter under the condition of ensuring the original advantages of the single-cycle control.
The technical scheme is as follows: the technical scheme adopted by the invention is a load current feedforward control method based on single-cycle control, which is applied to a single-cycle control circuit and comprises the following steps:
(1) load current I of digital control chip to single-period control circuitoSampling the input voltage and the output voltage, and calculating the peak value V of the input voltage in each power frequency periodgm(ii) a Wherein the load current I of the pair of circuitsoAfter sampling, the samples were filtered through a first order filter with a bandwidth set at 1/10 of the switching frequency.
(2) Feed-forward signal V of digital control chip to load currentloadCalculating; said load current feedforward signal VloadThe calculation formula of (A) is as follows:
Figure BDA0002528740320000011
wherein VoTo rated output voltage, VgmIs the peak value of the input voltage, IoIs the load current, RsThe inductance current sampling coefficient.
(3) The current inner loop reference signal controlled in a single period is as follows:
Vm＝Vload+Vm0
wherein, Vm0Error signals of a voltage loop in the single-period control circuit;
(4) superposing the current inner ring reference signal of the single-period control to a voltage ring error amplification output as a current ring reference signal of the single-period control;
(5) after the duty ratio of the single-period control is calculated, the digital control chip generates a corresponding PWM wave so as to control the on-off of the switching tube.
Based on the control method, the invention provides the PFC controller, which further comprises a load current feedforward circuit on the basis of single-period control of the PFC controller, wherein the load current feedforward circuit converts the load current into a feedforward signal VloadAnd the control signal is superposed to the voltage loop error amplification output to be used as a current loop reference signal of single-period control, the control duty ratio is obtained through current loop calculation, and the on-off of the switching tube is controlled according to the duty ratio. The single-period control PFC controller can be a single-phase Boost PFC converter or a three-phase Boost PFC converter.
Furthermore, the load current feedforward circuit also comprises a filter, and the load current signal is amplified in proportion into a feedforward signal V after being filteredloadSaid load current feedforward signal VloadThe calculation formula of (A) is as follows:
Figure BDA0002528740320000021
wherein VoTo rated output voltage, VgmIs the peak value of the input voltage, IoIs the load current, RsThe inductance current sampling coefficient.
Has the advantages that: compared with the existing single-cycle control technology, the method has the following advantages: on the basis of a classical single-period PFC controller, a load current feedforward control is added on a voltage control loop, a feedforward coefficient of the feedforward control is calculated by a basic principle of single-period control, and the response speed of the voltage loop to load change is accelerated, so that the dynamic performance of the controller is accelerated.
Drawings
Fig. 1 is a control block diagram of a Boost PFC converter according to the present invention;
FIG. 2 is a flow chart of a control algorithm according to the present invention;
FIG. 3 is a waveform diagram of the output voltage and input current under load and unload experiment according to the embodiment of the present invention, and FIG. 3(a) is an unloaded feedforward loading experiment; FIG. 3(b) is a feed forward loading experiment with load added; FIG. 3(c) is an unloaded feedforward unloading experiment; FIG. 3(d) is an experiment with load feed forward unloading.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The invention relates to a load current feedforward control method based on single-cycle control, which is a control flow chart of the method as shown in figure 2, and the specific process of adding the load feedforward single-cycle control is as follows by combining figure 2:
(1) for load current IoSampling is performed and then passed through a first order filter GcfAnd the bandwidth of the filter is set to 1/10 of the switching frequency, so that the influence caused by the load current switching ripple is eliminated, and the steady-state performance of the converter is improved. At the same time, inputVoltage is divided and sampled and then input into a digital control chip, and the peak value V of the input voltage in each power frequency period is calculatedgmAnd simultaneously, the output voltage is also subjected to voltage division sampling to the control chip, and the output voltage value V is calculatedo；
(2) Calculating a load current feedforward signal by using the signal sampling value in a digital chip, wherein the feedforward signal is related to the input and output voltage and the load current value of the PFC converter, and the method specifically comprises the following steps:
Figure BDA0002528740320000031
wherein R issThe inductance current sampling coefficient; the value is the equivalent sampling resistance of the inductance current end.
On the other hand, the error amplification signal of the voltage loop is still reserved, namely the output voltage is sampled and compared with the reference value, and the error of the output voltage is compared with the reference value through the PI regulator to obtain an error amplification signal Vm0；
(3) The current inner loop is given by:
Vm＝Vload+Vm0
wherein Vm0The output voltage is an error signal amplified by PI after being sampled and compared with a rated value;
(4) for the inductive current IgSampling with a sampling coefficient of RsAnd then, the current loop is adjusted through a low-pass filter and a zero-pole modulation link so as to ensure the stability and rapidity of the current loop. In the current loop, a calculation formula of a duty ratio can be derived according to a principle of single-period control, and the calculation formula specifically comprises the following steps:
Figure BDA0002528740320000032
(5) and after the duty ratio is obtained through calculation, the singlechip generates a corresponding PWM wave to control the on-off of a switching tube of the Boost circuit.
The invention is mainly applied to the Boost PFC converter for power factor correction, and simple and effective single-period control is ensuredThe dynamic response speed of the converter is obviously improved. As shown in fig. 1, a novel solution of a single-cycle power factor correction controller is proposed by improving a PFC converter by applying the load current feedforward control method based on single-cycle control. Taking a classical one-cycle Boost PFC controller as an example, the load current feed-forward control is added on a voltage control loop. The method comprises the following steps: a load current feedforward circuit is added on the basis of single-period control, one end of the load current feedforward circuit inputs a load current signal, the other end of the load current feedforward circuit is subjected to current filtering and proportional amplification and then added to a voltage loop to be subjected to error amplification and output, the load current signal and the voltage loop are jointly used as a current loop reference signal of single-period control, and the control duty ratio is obtained after current loop calculation. The scheme is suitable for a single three-phase Boost PFC converter, namely the input voltage V in front of a rectifier bridgegThe PFC effect can be fast and stable, and can be single-phase or three-phase.
In order to verify the effectiveness of the invention, the Boost PFC converter is verified experimentally.
The experimental conditions were: the effective value of the input alternating voltage is 220VAC, and the target output voltage is 750V. The experimental results using the scheme of the present invention are shown in FIG. 3, where the upper curve CH4 is the output voltage V0Waveform, the lower curve CH2 is the input current waveform Ig. FIG. 3(a) is an unloaded feedforward loading experiment; FIG. 3(b) is a feed forward loading experiment with load added; FIG. 3(c) is an unloaded feedforward unloading experiment; FIG. 3(d) is an experiment with load feed forward unloading. The converter makes loading and unloading sudden changes between 2kW and 5 kW. As can be seen from fig. 3, when no load feedforward is added, the voltage variation is about 35V, and when load feedforward is added, the output voltage variation is reduced to about 5V, thereby verifying that the load feedforward has a great improvement in the dynamic performance of the converter.

Claims (6)

1. A load current feedforward control method based on single-cycle control is applied to a single-cycle control circuit and is characterized by comprising the following steps:
(1) load current I of digital control chip to single-period control circuitoSampling the input voltage and the output voltage, and calculating the peak value V of the input voltage in each power frequency periodgm；
(2) Feed-forward signal V of digital control chip to load currentloadCalculating;
(3) the current inner loop reference signal controlled in a single period is as follows:
Vm＝Vload+Vm0
wherein, Vm0Error signals of a voltage loop in the single-period control circuit;
(4) superposing the current inner ring reference signal of the single-period control to a voltage ring error amplification output as a current ring reference signal of the single-period control;
(5) after the duty ratio of the single-period control is calculated, the digital control chip generates a corresponding PWM wave so as to control the on-off of the switching tube.
2. The method of claim 1, wherein the method comprises: the load current I of the circuit in the step (1)oAfter sampling, the samples were filtered through a first order filter with a bandwidth set at 1/10 of the switching frequency.
3. The method according to claim 1, wherein the load current feedforward control signal V in step (2)loadThe calculation formula of (A) is as follows:
Figure FDA0002528740310000011
wherein VoTo rated output voltage, VgmIs the peak value of the input voltage, IoIs the load current, RsThe inductance current sampling coefficient.
4. A PFC controller, characterized by: on the basis of a single-cycle control PFC controller, the control circuit further comprises a load current feedforward circuit, wherein the load current is supplied to the PFC controllerCurrent feed-forward circuit for converting load current into feed-forward signal VloadAnd the control signal is superposed to the voltage loop error amplification output to be used as a current loop reference signal of single-period control, the control duty ratio is obtained through current loop calculation, and the on-off of the switching tube is controlled according to the duty ratio.
5. The PFC controller of claim 4, wherein: the load current feedforward circuit also comprises a filter, and the load current signal is amplified into a feedforward signal V in proportion after being filteredloadSaid load current feedforward signal VloadThe calculation formula of (A) is as follows:
Figure FDA0002528740310000012
wherein VoTo rated output voltage, VgmIs the peak value of the input voltage, IoIs the load current, RsThe inductance current sampling coefficient.
6. The PFC controller of claim 4, wherein: the single-period control PFC controller is a single-phase Boost PFC converter or a three-phase Boost PFC converter.
CN202010509445.8A 2020-06-08 2020-06-08 Load current feedforward control method based on single-cycle control and PFC controller Pending CN111725988A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114499175A (en) * 2022-02-23 2022-05-13 北京华芯微半导体有限公司 Power supply control method and system
WO2022251999A1 (en) * 2021-05-31 2022-12-08 浙江吉利控股集团有限公司 Pfc fast dynamic response control method and system

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CN101546963A (en) * 2009-04-22 2009-09-30 南京航空航天大学 Digital monocyclic control method of PFC converter
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CN101546963A (en) * 2009-04-22 2009-09-30 南京航空航天大学 Digital monocyclic control method of PFC converter
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022251999A1 (en) * 2021-05-31 2022-12-08 浙江吉利控股集团有限公司 Pfc fast dynamic response control method and system
CN114499175A (en) * 2022-02-23 2022-05-13 北京华芯微半导体有限公司 Power supply control method and system

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Application publication date: 20200929