CN104466978A - Buck type power factor correction circuit - Google Patents
Buck type power factor correction circuit Download PDFInfo
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- CN104466978A CN104466978A CN201410652669.9A CN201410652669A CN104466978A CN 104466978 A CN104466978 A CN 104466978A CN 201410652669 A CN201410652669 A CN 201410652669A CN 104466978 A CN104466978 A CN 104466978A
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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
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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
- H02M1/12—Arrangements for reducing harmonics from AC input or output
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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
- H02M1/4275—Arrangements for improving power factor of AC input by adding an auxiliary output voltage in series to the input
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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Abstract
本发明涉及功率因数校正电路，旨在提供一种降压型功率因数校正电路。本发明包括Buck功率因数校正电路，其直流输出端为第一输出电容Co1；在Buck功率因数校正电路的电感上增加一个耦合的辅助绕组Lw2，并以一个二极管D2与辅助绕组Lw2串联用于整流，其直流输出端为第二输出电容Co2；第二输出电容Co2与第一输出电容Co1串联，负载Load则与该输出电容串联组合的两端相接。本发明提出了一种新型的降压型功率因数校正电路；不仅输出电压应力低于输入电压的峰值，而且相比传统Buck型功率因数校正电路输入端电流谐波含量低，输出电压的选取更灵活，适合输出电压可变的应用场合，提高功率因数。
The invention relates to a power factor correction circuit and aims to provide a step-down power factor correction circuit. The present invention includes a Buck power factor correction circuit, the DC output terminal of which is the first output capacitor Co1; a coupled auxiliary winding Lw2 is added to the inductance of the Buck power factor correction circuit, and a diode D2 is connected in series with the auxiliary winding Lw2 for rectification , the DC output end of which is the second output capacitor Co2; the second output capacitor Co2 is connected in series with the first output capacitor Co1, and the load Load is connected to both ends of the series combination of the output capacitor. The invention proposes a new type of step-down power factor correction circuit; not only the output voltage stress is lower than the peak value of the input voltage, but also the current harmonic content at the input terminal of the traditional Buck type power factor correction circuit is lower, and the selection of the output voltage is easier Flexible, suitable for applications with variable output voltage and improved power factor.
Description
技术领域technical field
本发明涉及功率因数校正电路，特别是应用于高效率、低输入电流谐波的功率因数校正场合的降压型功率因数校正电路。The invention relates to a power factor correction circuit, in particular to a step-down power factor correction circuit applied to the power factor correction occasion with high efficiency and low input current harmonics.
背景技术Background technique
由于目前大多数用电设备中的非线性元件和储能元件会使输入交流电流波形发生严重畸变，网侧输入功率因数很低，为满足国际标准IEC61000-3-2的谐波要求，必须在这些用电设备中加入功率因数校正(Power factor correction，PFC)电路。在大功率LED照明应用场合下由于LED模块电压各不相同，以及灯具应用在不同国家地区，因此具有宽范围输入、输出电压的PFC电路是很有必要的。Since the non-linear components and energy storage components in most current electrical equipment will seriously distort the input AC current waveform, and the input power factor of the grid side is very low, in order to meet the harmonic requirements of the international standard IEC61000-3-2, it must be A power factor correction (Power factor correction, PFC) circuit is added to these electrical equipment. In high-power LED lighting applications, due to the different voltages of LED modules and the application of lamps in different countries and regions, it is necessary to have a PFC circuit with a wide range of input and output voltages.
传统的有源功率因数校正电路一般采用升压(Boost)拓扑，因为Boost具有控制容易、驱动简单以及在整个工频周期内都可以进行开关工作、输入电流的功率因数接近于1的优势，但是在宽范围输入段(90Vac-265Vac)Boost电路具有输出电压高的缺点。传统的具有宽输出电压范围的电路拓扑有buck-boost、flyback、SEPIC、Cuk电路，但是存在电压、电流应力高、输出电压反向的问题。普通Buck型功率因数校正拓扑虽然能够获得较高输入功率因数,并且还可以降低输出侧的电压应力(如图1)。但是，在Buck功率因数校正电路中，输出侧的电压决定着输入电流的死区时间，较高的输出电压，会导致输入电流中的高次谐波含量增加(如图2)，很难通过Class C的谐波标准。Traditional active power factor correction circuits generally adopt boost (Boost) topology, because Boost has the advantages of easy control, simple driving, switching operation in the entire power frequency cycle, and the power factor of the input current is close to 1, but In the wide-range input section (90Vac-265Vac), the Boost circuit has the disadvantage of high output voltage. Traditional circuit topologies with a wide output voltage range include buck-boost, flyback, SEPIC, and Cuk circuits, but there are problems with high voltage and current stress and reversed output voltage. Although the ordinary Buck power factor correction topology can obtain a higher input power factor, it can also reduce the voltage stress on the output side (as shown in Figure 1). However, in the Buck power factor correction circuit, the voltage on the output side determines the dead time of the input current, and a higher output voltage will lead to an increase in the high-order harmonic content in the input current (as shown in Figure 2), which is difficult to pass Harmonic standards for Class C.
发明内容Contents of the invention
本发明要解决的技术问题是，克服现有技术的不足，提供一种降压型功率因数校正电路。该电路是一种能够将输入侧电流的死区与输出电压解耦的降压型功率因数校正拓扑，从而获得低的谐波电流含量和较灵活的输出电压。The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a step-down power factor correction circuit. The circuit is a step-down power factor correction topology that can decouple the dead zone of the input side current from the output voltage, thereby obtaining low harmonic current content and more flexible output voltage.
为解决上述问题，本发明的解决方案是：For addressing the above problems, the solution of the present invention is:
提供一种降压型功率因数校正电路，包括Buck功率因数校正电路，其直流输出端为第一输出电容Co1；在Buck功率因数校正电路的电感上增加一个耦合的辅助绕组Lw2，并以一个二极管D2与辅助绕组Lw2串联用于整流，其直流输出端为第二输出电容Co2；第二输出电容Co2与第一输出电容Co1串联，负载Load则与该输出电容串联组合的两端相接。A step-down power factor correction circuit is provided, including a Buck power factor correction circuit, whose DC output terminal is the first output capacitor Co1; a coupled auxiliary winding Lw2 is added to the inductance of the Buck power factor correction circuit, and a diode D2 is connected in series with the auxiliary winding Lw2 for rectification, and its DC output terminal is the second output capacitor Co2; the second output capacitor Co2 is connected in series with the first output capacitor Co1, and the load Load is connected to both ends of the series combination of the output capacitor.
作为一种改进，本发明所述Buck功率因数校正电路的电感是一个耦合电感，具有相互耦合的辅助绕组Lw1和辅助绕组Lw2；所述电路的具体结构是：输入交流电压Vac经二极管整流网络B1接至电容Cin的两端，电容Cin的正端同时接到二极管D1的阴极和第一输出电容Co1的正端，电容Cin的负端接到开关S 1的2号端；二极管D1的阳极同时接到辅助绕组Lw1的同名端和开关S1的1号端，辅助绕组Lw1的非同名端同时接到第一输出电容Co1的负端和第二输出电容Co2的正端；辅助绕组Lw2的同名端接到第二输出电容Co2的正端，辅助绕组Lw2的非同名端接到二极管D2的阴极，二极管D2的阳极接到第二输出电容Co2的负端；输出电容Co并联在第一输出电容Co1的正端和第二输出电容Co2的负端，负载Load则与输出电容Co并联。As an improvement, the inductance of the Buck power factor correction circuit in the present invention is a coupled inductance with mutually coupled auxiliary winding Lw1 and auxiliary winding Lw2; the specific structure of the circuit is: the input AC voltage Vac is passed through the diode rectification network B1 Connect to both ends of the capacitor Cin, the positive end of the capacitor Cin is connected to the cathode of the diode D1 and the positive end of the first output capacitor Co1 at the same time, the negative end of the capacitor Cin is connected to the No. 2 end of the switch S1; the anode of the diode D1 is simultaneously Connected to the terminal with the same name of the auxiliary winding Lw1 and the No. 1 terminal of the switch S1, the non-identical terminal of the auxiliary winding Lw1 is connected to the negative terminal of the first output capacitor Co1 and the positive terminal of the second output capacitor Co2 at the same time; the terminal of the same name of the auxiliary winding Lw2 Connected to the positive terminal of the second output capacitor Co2, the non-identical terminal of the auxiliary winding Lw2 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the negative terminal of the second output capacitor Co2; the output capacitor Co is connected in parallel to the first output capacitor Co1 The positive terminal of the second output capacitor Co2 and the negative terminal of the second output capacitor Co2, and the load Load is connected in parallel with the output capacitor Co.
作为一种改进，本发明所述Buck功率因数校正电路的电感是一个耦合电感，具有相互耦合的辅助绕组Lw1和辅助绕组Lw2；所述电路的具体结构是：输入交流电压Vac经二极管整流网络B1接至电容Cin的两端，电容Cin的负端同时接到二极管D1的阳极和第一输出电容Co1的负端，电容Cin的正端接到开关S 1的1号端；二极管D1的阴极同时接到辅助绕组Lw1的非同名端和开关S1的2号端，辅助绕组Lw1的同名端同时接到第一输出电容Co1的正端和第二输出电容Co2的负端；辅助绕组Lw2的非同名端接到第二输出电容Co2的负端，辅助绕组Lw2的同名端接到二极管D2的阳极，二极管D2的阴极接到第二输出电容Co2的正端；输出电容Co并联在第一输出电容Co1的负端和第二输出电容Co2的正端，负载Load则与输出电容Co并联。As an improvement, the inductance of the Buck power factor correction circuit in the present invention is a coupled inductance with mutually coupled auxiliary winding Lw1 and auxiliary winding Lw2; the specific structure of the circuit is: the input AC voltage Vac is passed through the diode rectification network B1 Connect to both ends of the capacitor Cin, the negative end of the capacitor Cin is connected to the anode of the diode D1 and the negative end of the first output capacitor Co1 at the same time, the positive end of the capacitor Cin is connected to the No. 1 end of the switch S1; the cathode of the diode D1 is simultaneously Connected to the non-identical end of the auxiliary winding Lw1 and the No. 2 end of the switch S1, the same-named end of the auxiliary winding Lw1 is connected to the positive end of the first output capacitor Co1 and the negative end of the second output capacitor Co2; the non-identical end of the auxiliary winding Lw2 The terminal is connected to the negative terminal of the second output capacitor Co2, the terminal of the same name of the auxiliary winding Lw2 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the positive terminal of the second output capacitor Co2; the output capacitor Co is connected in parallel to the first output capacitor Co1 The negative terminal of the second output capacitor Co2 and the positive terminal of the second output capacitor Co2, and the load Load is connected in parallel with the output capacitor Co.
本发明的实现原理如下：Realization principle of the present invention is as follows:
通过在Buck电路的电感上增加辅助绕组Lw2，并在绕组Lw2上串联二极管D2进行整流，得到第二个直流输出Vo2,并与第一个Buck电路的直流输出Vo1进行串联，得到总的输出Vo为Vo1与Vo2之和；由于Vo2与Vo1的输出电压比值可以通过调整Lw2与Lw1的匝比n进行调整，因而可以在保持Vo1不变的条件下，获得很灵活的总输出电压Vo；或者在保持输出总电压Vo不变的条件下,可以很容易的改变n的设计值，改变Vo1的值；由于输入电流的死区时间取决于输入电压Vin与第一输出电压Vo1，因此可以根据所需要满足的功率因数和谐波含量要求设计Vo1的电压值，并通过n来获得需要的总输出电压Vo，据此，本发明电路中的输入电流的死区角度不随总输出Vo变化，实现了输入电流死区与输出电压的解耦。By adding the auxiliary winding Lw2 to the inductance of the Buck circuit, and connecting the diode D2 in series on the winding Lw2 for rectification, the second DC output Vo2 is obtained, and connected in series with the DC output Vo1 of the first Buck circuit to obtain the total output Vo is the sum of Vo1 and Vo2; since the output voltage ratio of Vo2 and Vo1 can be adjusted by adjusting the turn ratio n of Lw2 and Lw1, a very flexible total output voltage Vo can be obtained under the condition of keeping Vo1 unchanged; or in Under the condition of keeping the total output voltage Vo constant, it is easy to change the design value of n and the value of Vo1; since the dead time of the input current depends on the input voltage Vin and the first output voltage Vo1, it can be adjusted according to the needs Satisfied power factor and harmonic content require the voltage value of Vo1 to be designed, and the required total output voltage Vo is obtained through n. Accordingly, the dead zone angle of the input current in the circuit of the present invention does not change with the total output Vo, and the input decoupling of the current deadband from the output voltage.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1)提高输入端的功率因数，降低谐波含量；1) Improve the power factor at the input end and reduce the harmonic content;
2)开关器件电压应力低；2) The voltage stress of the switching device is low;
3)无需降低输出电压就可以减小了输入端的电流死区时间；3) The current dead time at the input terminal can be reduced without reducing the output voltage;
4)将输入如电流的死区时间与输出电压解耦；4) Decoupling the dead time of the input such as current from the output voltage;
5)输出电压的设计更灵活；5) The design of the output voltage is more flexible;
6)无需改变控制策略，电路简单，控制方便。6) There is no need to change the control strategy, the circuit is simple, and the control is convenient.
综上所述，本发明提出了一种新型的降压型功率因数校正电路；不仅输出电压应力低于输入电压的峰值，而且相比传统Buck型功率因数校正电路输入端电流谐波含量低，输出电压的选取更灵活，适合输出电压可变的应用场合，提高功率因数。In summary, the present invention proposes a novel step-down power factor correction circuit; not only the output voltage stress is lower than the peak value of the input voltage, but also the current harmonic content at the input terminal of the traditional Buck type power factor correction circuit is lower, The selection of the output voltage is more flexible, suitable for applications with variable output voltage, and improves the power factor.
附图说明Description of drawings
图1传统Buck功率因数校正电路；Figure 1 Traditional Buck power factor correction circuit;
图2传统Buck功率因数校正电路的输入电流与输入电压和输出电压的示意图；Fig. 2 is a schematic diagram of input current, input voltage and output voltage of a traditional Buck power factor correction circuit;
图3本发明提出的新型功率因数校正电路；The novel power factor correction circuit that Fig. 3 present invention proposes;
图4本发明中输入电流与输出电压的关系；The relationship between input current and output voltage among Fig. 4 the present invention;
图5本发明的另一种实施方式。Fig. 5 Another embodiment of the present invention.
具体实施方式Detailed ways
下面通过具体的实例并结合附图对本发明做进一步的描述。The present invention will be further described below through specific examples and in conjunction with the accompanying drawings.
参照图3，输入交流电压Vac接到二极管整流网络B1的输入端，B1的输出正端接到电容Cin的正端，B1的输出负端接到电容Cin的负端；Cin的正端同时接到二极管D1的阴极，D1的阳极接到开关S1的1号端，S1的2号端接到电容Cin的负端；二极管D1的阳极同时还接到耦合电感的绕组Lw1的同名端，Lw1的另一端接到输出电容Co1的负端，同时接到Co2的正端；Lw2的同名端接到Co2的正端，另一端接到二极管D2的阴极，D2的阳极接到Co2的负端；输出电容Co并联在Co1的正端和Co2的负端。负载Load与Co并联。Referring to Figure 3, the input AC voltage Vac is connected to the input terminal of the diode rectifier network B1, the positive output terminal of B1 is connected to the positive terminal of the capacitor Cin, the negative output terminal of B1 is connected to the negative terminal of the capacitor Cin; the positive terminal of Cin is connected to the positive terminal of the capacitor Cin at the same time To the cathode of diode D1, the anode of D1 is connected to the No. 1 terminal of switch S1, and the No. 2 terminal of S1 is connected to the negative terminal of capacitor Cin; the anode of diode D1 is also connected to the same-named terminal of the winding Lw1 of the coupled inductor, and the terminal of Lw1 The other end is connected to the negative end of the output capacitor Co1 and the positive end of Co2 at the same time; the same-named end of Lw2 is connected to the positive end of Co2, the other end is connected to the cathode of diode D2, and the anode of D2 is connected to the negative end of Co2; output Capacitor Co is connected in parallel between the positive end of Co1 and the negative end of Co2. The load Load is connected in parallel with Co.
参照图5，输入交流电压Vac接到二极管整流网络B1的输入端，B1的输出正端接到电容Cin的正端，B1的输出负端接到电容Cin的负端；Cin的正端接到开关的1号端，S1的2号端接到二极管D1的阴极，D1的阳极接到输入电容Cin的负端；D1的阴极同时接到耦合电感的绕组Lw1的一端，另一端(同名端)接到输出电容Co1的正端，Co1的负端接到二极管D1的阳极；Co1的正端接到Co1的负端，Co2的正端接到二极管D2的阴极，D2的阳极接到绕组Lw2的同名端，Lw2的另一端接到Co2的负端。输出电容Co并联在Co1的负端和Co2的正端，负载Load并联在Co。Referring to Figure 5, the input AC voltage Vac is connected to the input terminal of the diode rectification network B1, the positive output terminal of B1 is connected to the positive terminal of the capacitor Cin, the negative output terminal of B1 is connected to the negative terminal of the capacitor Cin; the positive terminal of Cin is connected to Terminal 1 of the switch, terminal 2 of S1 are connected to the cathode of diode D1, and the anode of D1 is connected to the negative terminal of the input capacitor Cin; the cathode of D1 is connected to one end of the winding Lw1 of the coupled inductor at the same time, and the other end (end with the same name) Connected to the positive terminal of the output capacitor Co1, the negative terminal of Co1 is connected to the anode of the diode D1; the positive terminal of Co1 is connected to the negative terminal of Co1, the positive terminal of Co2 is connected to the cathode of the diode D2, and the anode of D2 is connected to the winding Lw2 The end with the same name, the other end of Lw2 is connected to the negative end of Co2. The output capacitor Co is connected in parallel to the negative terminal of Co1 and the positive terminal of Co2, and the load Load is connected in parallel to Co.
应该理解到的是：以上列举的仅是本发明的具体实施例。显然，本发明不限于以上实施例，还可以有许多变形。本领域的普通技术人员能从本发明公开的内容直接导出或联想到的所有变形，均应认为是发明的保护范围。It should be understood that: the above-mentioned examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the invention.
Claims (3)
Priority Applications (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105207472A (en) * | 2015-10-27 | 2015-12-30 | 杰华特微电子（杭州）有限公司 | Circuit used for boosting buck output voltage |
| CN109889060A (en) * | 2018-10-09 | 2019-06-14 | 南京博兰得电能技术发展有限公司 | The AC-DC isolated converter of high power density |
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| FR2959365A1 (en) * | 2010-04-26 | 2011-10-28 | Mge Ups Systems | CONVERTER DEVICE AND POWER SUPPLY WITHOUT INTERRUPTION EQUIPPED WITH SUCH A DEVICE |
| CN203617902U (en) * | 2013-12-09 | 2014-05-28 | 杭州士兰微电子股份有限公司 | Integrated buck-flyback type high power factor constant current circuit and device |
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| FR2959365A1 (en) * | 2010-04-26 | 2011-10-28 | Mge Ups Systems | CONVERTER DEVICE AND POWER SUPPLY WITHOUT INTERRUPTION EQUIPPED WITH SUCH A DEVICE |
| CN203617902U (en) * | 2013-12-09 | 2014-05-28 | 杭州士兰微电子股份有限公司 | Integrated buck-flyback type high power factor constant current circuit and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207472A (en) * | 2015-10-27 | 2015-12-30 | 杰华特微电子（杭州）有限公司 | Circuit used for boosting buck output voltage |
| CN109889060A (en) * | 2018-10-09 | 2019-06-14 | 南京博兰得电能技术发展有限公司 | The AC-DC isolated converter of high power density |
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| CN104466978B (en) | 2017-10-03 |
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