CN113114035A - Digital-control bidirectional PFC system - Google Patents
Digital-control bidirectional PFC system Download PDFInfo
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- CN113114035A CN113114035A CN202110404004.6A CN202110404004A CN113114035A CN 113114035 A CN113114035 A CN 113114035A CN 202110404004 A CN202110404004 A CN 202110404004A CN 113114035 A CN113114035 A CN 113114035A
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- 230000002457 bidirectional effect Effects 0.000 title abstract description 8
- 238000005070 sampling Methods 0.000 claims description 9
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- 238000010586 diagram Methods 0.000 description 17
- 230000000295 complement effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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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
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the related field of PFC systems, in particular to a digital control bidirectional PFC system, which comprises a PFC main circuit, a voltage outer ring control module, a current inner ring control module and a main control chip.
Description
Technical Field
The invention relates to the field of PFC (power factor correction) systems, in particular to a digital control bidirectional PFC system.
Background
With the development of global economy, environmental issues become a problem that is increasingly being addressed in various countries. The development of new energy automobiles is promoted all over the world, a large number of electric automobiles are brought into the market, the dependence on a power grid is increased, and the influence of the charging and discharging behaviors of the electric automobiles on the power grid is obviously increased.
PFC control is an essential part of an on-board charger (OBC) to reduce the interference of the charger on the power grid during charging. The positive working of the PFC realizes AC/DC and power grid access, and the battery of the electric automobile is charged; the reverse work of PFC realizes DC/AC, and the electric energy is reversed from the battery pack to generate alternating current. The bidirectional OBC can well integrate charging and discharging in the same power electronic converter, can effectively reduce cost and volume and improve power density. Therefore, it is necessary to promote the development of bidirectional OBCs.
At present, in the bidirectional PFC control strategy in the market, a control strategy of double closed-loop PI control and voltage outer loop current inner loop is adopted in many cases. Because the gain of the PI algorithm at a high-frequency signal is lower and the PI algorithm has a larger amplification effect on a low-frequency signal, the PI algorithm can amplify a noise signal at a low frequency, and because the rectifying device and the inverting device are nonlinear systems, a satisfactory control effect can not be achieved by adopting the traditional double-closed-loop PI control. Aiming at the problem, a bidirectional PFC system adopting digital control is designed.
Disclosure of Invention
The present invention is directed to a bi-directional PFC system with digital control, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an adopt two-way PFC system of digital control, includes PFC main circuit, voltage outer loop control module, current inner loop control module and main control chip, its characterized in that: the PFC main circuit obtains alternating voltage, alternating current and output voltage sampling values through ADC sampling of a main control chip, the alternating voltage, the alternating current and the output voltage sampling values are input into a voltage outer ring control module and a current inner ring control module, and then the voltage outer ring control module and the current inner ring control module control the PFC main circuit through PWM.
Preferably, the main PFC circuit is of a totem-pole PFC structure.
Preferably, the main control chip adopts a DSP chip with 100MHz dominant frequency of the mainstream in the market
Preferably, the PFC main circuit has two operating modes, which are respectively: when the PFC works in the forward direction, an ADC (analog to digital converter) of the main control chip samples a PFC main circuit to obtain bus voltage, the bus voltage is input into a voltage outer ring control module to carry out voltage outer ring control, then the voltage outer ring control module outputs alternating voltage feedforward, then the alternating voltage feedforward enters a current inner ring control module to carry out current inner ring control and output feedback current, and finally the current inner ring control module outputs amplitude limiting to enter PWM (pulse width modulation) so as to control the PFC; when the PFC works reversely, an ADC (analog to digital converter) of the main control chip samples a PFC main circuit to obtain output alternating voltage, the output alternating voltage enters a voltage outer ring control module to carry out voltage outer ring control, then the voltage outer ring control module inputs a current inner ring control module to carry out current inner ring control, and finally the current inner ring control module outputs amplitude limiting to carry out SPWM (sinusoidal pulse Width modulation) control on a PFC reverse mode
Preferably, double closed-loop control is adopted between the voltage outer-loop control module and the current inner-loop control module, and the PIR algorithm is adopted for the double closed-loop control
Preferably, the PIR algorithm has a transfer function of:
compared with the prior art, the invention has the beneficial effects that: according to the invention, the PIR algorithm is discretized, and a totem-pole PFC forward and reverse double closed-loop control algorithm is carried out, after the algorithm is improved, the PIR algorithm is better controlled at low frequency and high frequency, the system tracking is better, the steady-state error is smaller, and the overall performance is comprehensively improved, so that the OBC performance is integrally improved.
Drawings
FIG. 1 is a block diagram of the system architecture of the present invention;
FIG. 2 is a simplified topology diagram of a forward PFC according to the present invention;
FIG. 3 is a simplified topology diagram of a reverse PFC according to the present invention;
FIG. 4 is a schematic diagram of a dual closed-loop control process according to the present invention;
FIG. 5 is a flow chart of a dual closed-loop control interrupt process according to the present invention;
FIG. 6 is a block diagram of the forward PFC control of the present invention;
fig. 7 is a block diagram of a reverse PFC control according to the present invention;
fig. 8 is a PI algorithm kp-1, 20, 100 bode diagram of the present invention;
fig. 9 is a PI algorithm ki-1, 20, 100 bode diagram of the present invention;
fig. 10 is a PR algorithm kp of the present invention-1, 20, 100 bode plot;
fig. 11 is a PR algorithm kr-1, 20, 100 bode diagram of the present invention;
fig. 12 is a PIR algorithm kp-1, 20, 100 bode plot of the present invention;
fig. 13 is a PIR algorithm kr-1, 20, 100 bode diagram of the present invention;
fig. 14 shows a bur diagram of PIR algorithm wc of 6.28, 314, 628.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-13, the present invention provides a technical solution: the utility model provides an adopt two-way PFC system of digital control, includes PFC main circuit, voltage outer loop control module, current inner loop control module and main control chip, its characterized in that: the PFC main circuit obtains alternating voltage, alternating current and output voltage sampling values through ADC sampling of the main control chip, the alternating voltage, the alternating current and the output voltage sampling values are input into the voltage outer ring control module and the current inner ring control module, and then the PFC main circuit is controlled through PWM by the voltage outer ring control module and the current inner ring control module.
Furthermore, the main PFC circuit adopts a totem-pole PFC structure.
Furthermore, the main control chip adopts a DSP chip with 100MHz dominant frequency of the mainstream in the market
Further, the PFC main circuit has two operating modes, which are respectively: when the PFC works in the forward direction, an ADC (analog to digital converter) of the main control chip samples a PFC main circuit to obtain bus voltage, the bus voltage is input into a voltage outer ring control module to carry out voltage outer ring control, then the voltage outer ring control module outputs alternating voltage feedforward, then the alternating voltage feedforward enters a current inner ring control module to carry out current inner ring control and output feedback current, and finally the current inner ring control module outputs amplitude limiting to enter PWM (pulse width modulation) so as to control the PFC; when the PFC works reversely, an ADC (analog to digital converter) of the main control chip samples a PFC main circuit to obtain output alternating voltage, the output alternating voltage enters a voltage outer ring control module to carry out voltage outer ring control, then the voltage outer ring control module inputs a current inner ring control module to carry out current inner ring control, and finally the current inner ring control module outputs amplitude limiting to carry out SPWM (sinusoidal pulse Width modulation) control on a PFC reverse mode
Furthermore, double closed-loop control is adopted between the voltage outer-loop control module and the current inner-loop control module, and the PIR algorithm is adopted for the double closed-loop control
Further, the PIR algorithm has a transfer function of:
the invention mainly improves the control algorithm of the current inner ring and the voltage outer ring, and the ideal PR algorithm has the advantages that the change of the related parameters for adjusting PR is not very large, the graph change is very small in practical application, and the tracking effect is not very good. So a modified algorithm of the PR algorithm-the PIR algorithm is employed. The following compares the PI algorithm, PR algorithm and PIR algorithm. Wherein the transfer function of the ideal PR algorithm is:
the transfer function of the proportional-integral controller is:
the bode plot of the PI algorithm, kp 1, 20, 100, ki 20 is shown in fig. 8.
The bode plot of PI algorithm, ki 1, 20, 100, kp 1 is shown in fig. 9 below.
As can be seen from fig. 8 and 9, the PI controller has a larger amplification effect at low frequency, and the gain of the high frequency signal is lower. If the signals of the frequencies at and below the power frequency are tracked, the system response is poor, and the low-frequency noise and harmonic content are high.
PR algorithm, kp 1, 20, 100, kr 20 bode diagram is shown in fig. 10.
The PR algorithm, kr 1, 20, 100, and kp 1 bode diagram is shown in fig. 11 below.
As can be seen from the ideal PR algorithm bode plots in fig. 10 and 11, even if the parameters change, the waveform is less affected. System tracking performance may also be poor. Next, the modified PR algorithm-PIR algorithm is used.
The bode diagram of the PIR algorithm, kp 1, 20, 100, kr 20, and wc 62.8 is shown in fig. 12.
The bode diagram of the PIR algorithm, kr 1, 20, 100, kp 1, and wc 62.8, is shown in fig. 13.
The bode diagram of the PIR algorithm, wc 6.28, 314, 628, kp 20, kr 100 is shown in fig. 14.
As can be seen from the Berde diagrams of the PI and PIR algorithms, the PI and PIR algorithms kp are similar, the open-loop gain is increased, and the control precision is increased; ki and kr also act similarly, both reducing the steady state error of the system.
The method has the advantages that the positive and reverse double closed-loop control algorithm of the totem-pole PFC is carried out through discretization of the PIR algorithm, after the algorithm is improved, system tracking is better, steady-state errors are smaller, overall performance is comprehensively improved, and OBC performance is integrally improved. The PIR algorithm controls well at both low and high frequencies.
The working principle is as follows: the working principle of the forward PFC topology is shown in FIG. 2, wherein PQ4 and PQ3 are high-speed tubes, a sic tube is selected, PQ2 and PQ1 are low-speed tubes, and a common MOS tube is selected. In the forward PFC topology, when the ac voltage is greater than 0, PQ1 is always on, PQ2 is always off, PQ4 and PQ3 are complementary transistors controlled by PWM, PQ3 is on to perform a boosting operation, and PQ4 is on to perform a freewheeling operation; when the ac voltage is less than 0, PQ2 is always on, PQ1 is always off, PQ4 and PQ3 are complementary transistors controlled by PWM, PQ4 is on to perform a boosting operation, and PQ3 is on to perform a freewheeling operation. And soft-start operation is performed at the ac voltage zero-crossing point. We set the high-speed tube frequency to 70khz and the low-speed tube frequency to 50 hz.
The working principle of the reverse PFC topological structure is shown in FIG. 3, wherein PQ4 and PQ3 are high-speed tubes, a sic tube is selected, PQ2 and PQ1 are low-speed tubes, and a common MOS tube is selected. In the topological structure, PQ1 is always conducted and PQ2 is always closed in a positive half cycle of alternating voltage, PQ4 and PQ3 are complementary tubes controlled by PWM, the conducted output voltage of PQ4 is vdc, and the conducted output voltage of PQ3 is 0; in the negative half cycle of the ac voltage, PQ2 is always on, PQ1 is always off, PQ4 and PQ3 are complementary transistors controlled by PWM, the on output voltage of PQ3 is-vdc, and the on output voltage of PQ4 is 0.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an adopt two-way PFC system of digital control, includes PFC main circuit, voltage outer loop control module, current inner loop control module and main control chip, its characterized in that: the PFC main circuit obtains alternating voltage, alternating current and output voltage sampling values through ADC sampling of a main control chip, the alternating voltage, the alternating current and the output voltage sampling values are input into a voltage outer ring control module and a current inner ring control module, and then the voltage outer ring control module and the current inner ring control module control the PFC main circuit through PWM.
2. The bi-directional PFC system using digital control according to claim 1, wherein: the main PFC circuit adopts a totem-pole PFC structure.
3. The bi-directional PFC system using digital control according to claim 1, wherein: the main control chip adopts a DSP chip with 100MHz dominant frequency which is mainstream in the market.
4. The bi-directional PFC system using digital control according to claim 1, wherein: the PFC main circuit has two working modes, which are respectively as follows: when the PFC works in the forward direction, an ADC (analog to digital converter) of the main control chip samples a PFC main circuit to obtain bus voltage, the bus voltage is input into a voltage outer ring control module to carry out voltage outer ring control, then the voltage outer ring control module outputs alternating voltage feedforward, then the alternating voltage feedforward enters a current inner ring control module to carry out current inner ring control and output feedback current, and finally the current inner ring control module outputs amplitude limiting to enter PWM (pulse width modulation) so as to control the PFC; when the PFC works reversely, an ADC (analog to digital converter) of the main control chip samples a PFC main circuit to obtain output alternating voltage, the output alternating voltage enters a voltage outer ring control module to carry out voltage outer ring control, then the voltage outer ring control module inputs the current inner ring control module to carry out current inner ring control, and finally the current inner ring control module outputs amplitude limiting to carry out SPWM (sinusoidal pulse width modulation) control on a PFC reverse mode.
5. The bi-directional PFC system using digital control according to claim 1, wherein: and double closed-loop control is adopted between the voltage outer-loop control module and the current inner-loop control module, and PIR algorithm is adopted for the double closed-loop control.
6. The bi-directional PFC system using digital control according to claim 5, wherein: the PIR algorithm has a transfer function of:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094863A (en) * | 2021-11-15 | 2022-02-25 | 天水七四九电子有限公司 | Inverter power supply and open-loop direct current boosting and closed-loop alternating current output control method thereof |
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