CN203219195U - Bridgeless PFC converter capable of Buck and Buck-Boost switching work - Google Patents
Bridgeless PFC converter capable of Buck and Buck-Boost switching work Download PDFInfo
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Abstract
Description
技术领域technical field
本实用新型涉及PFC变换器领域，具体涉及一种降压和升降压切换工作的无桥PFC变换器。The utility model relates to the field of PFC converters, in particular to a bridgeless PFC converter for step-down and step-down switching.
背景技术Background technique
目前广泛应用的PFC变换器为Boost变换器，要求Boost变换器的输出电压为400V左右，当输入电压较低时，它将工作于大占空比的状态，这会导致变换器发热严重，变换器功率密度受到限制；Sepic、Cuk以及Buck-Boost变换器也常应用于PFC场合，这些变换器虽然能达到很高的功率因数，但是开关应力很大，导致开关损耗增大，效率降低，成本升高；Buck变换器也越来越多地应用到PFC场合，但是由于其存在死区问题，功率因数的提高受到限制。At present, the widely used PFC converter is the Boost converter, and the output voltage of the Boost converter is required to be about 400V. The power density of converters is limited; Sepic, Cuk and Buck-Boost converters are also often used in PFC applications. Although these converters can achieve high power factors, the switching stress is large, resulting in increased switching losses, reduced efficiency, and cost Raise; Buck converter is also increasingly applied to PFC occasions, but because of its dead zone problem, the improvement of power factor is limited.
实用新型内容Utility model content
为了克服现有技术存在的缺点与不足，本实用新型提供一种降压和升降压切换工作的无桥PFC变换器，本实用新型工作于Buck和Buck-Boost两种工作模式，解决了Buck PFC变换器固有存在的死区问题。In order to overcome the shortcomings and deficiencies of the prior art, the utility model provides a bridgeless PFC converter that switches between step-down and boost-boost. The inherent dead zone problem of PFC converter.
本实用新型采用的技术方案：The technical scheme that the utility model adopts:
一种降压和升降压切换工作的无桥PFC变换器，包括第一开关管S1、第二开关管S2、第三开关管S3、第一二极管D1、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5、第六二极管D6、电感L和电容C；A bridgeless PFC converter with step-down and buck-boost switching operations, comprising a first switching tube S 1 , a second switching tube S 2 , a third switching tube S 3 , a first diode D 1 , a second switching tube S 3 Diode D 2 , third diode D 3 , fourth diode D 4 , fifth diode D 5 , sixth diode D 6 , inductor L and capacitor C;
所述第一开关管S1的漏极分别与输入电压的一端、第二二极管D2的阴极连接，所述第一开关管S1的源级与第一二极管D1的阳极连接；The drain of the first switching tube S1 is respectively connected to one end of the input voltage and the cathode of the second diode D2 , and the source of the first switching tube S1 is connected to the anode of the first diode D1 connect;
所述第一二极管D1的阴极与第四二极管D4的阴极、第三二极管D3的阳极、第六二极管D6的阳极连接，所述第六二极管D6的阴极与电容C的一端、输出电压的正极连接；The cathode of the first diode D1 is connected to the cathode of the fourth diode D4 , the anode of the third diode D3 , and the anode of the sixth diode D6 , and the sixth diode The cathode of D 6 is connected to one end of the capacitor C and the positive pole of the output voltage;
所述电容C的另一端分别与输出电压的负极和第三开关管S3的源级、电感L的一端连接；The other end of the capacitor C is respectively connected to the negative pole of the output voltage, the source stage of the third switching transistor S3 , and one end of the inductor L;
所述电感L的另一端与第五二极管D5的阳极、第二开关管S2的漏极连接，所述第二开关管S2的源级和第二二极管D2的阳极连接；The other end of the inductor L is connected to the anode of the fifth diode D5 and the drain of the second switch S2 , the source of the second switch S2 is connected to the anode of the second diode D2 connect;
所述第四二极管D4的阳极与输入电压的另一端、第五二极管D5的阴极连接；The anode of the fourth diode D4 is connected to the other end of the input voltage and the cathode of the fifth diode D5 ;
所述第三二极管D3的阴极与第三开关管S3的漏极连接。The cathode of the third diode D3 is connected to the drain of the third switching transistor S3 .
所述第四二极管D4、第五二极管D5、第六二极管D6为快恢复二极管，电容C为电解电容。The fourth diode D 4 , the fifth diode D 5 , and the sixth diode D 6 are fast recovery diodes, and the capacitor C is an electrolytic capacitor.
所述第一二极管D1、第二二极管D2、第三二极管D3用于阻断第一开关管S1、第二开关管S2、第三开关管S3所在支路电流回流。The first diode D 1 , the second diode D 2 , and the third diode D 3 are used to block where the first switching tube S 1 , the second switching tube S 2 , and the third switching tube S 3 are located. Branch current backflow.
一种Buck和Buck-Boost切换工作的无桥PFC变换器，当输入电压vin大于输出电压vo时，工作于Buck模式；当输入电压vin小于输出电压vo时，工作于Buck-Boost模式。A bridgeless PFC converter with Buck and Buck-Boost switching operation. When the input voltage v in is greater than the output voltage v o , it works in Buck mode; when the input voltage v in is smaller than the output voltage v o , it works in Buck-Boost model.
当变换器工作于Buck模式时，其中只有第一开关管S1、第二开关管S2、第一二极管D1、第二二极管D2、第四二极管D4、第五二极管D5、第六二极管D6、电感L和电容C工作；当变换器工作于Buck-Boost模式时，第一开关管S1、第二开关管S2、第三开关管S3、第一二极管D1、第二二极管D2、第四二极管D4、第五二极管D5、第六二极管D6、第三二极管D3、电感L和电容C工作。When the converter works in Buck mode, only the first switch S1, the second switch S2, the first diode D 1 , the second diode D 2 , the fourth diode D 4 , and the fifth and second diodes Diode D 5 , sixth diode D 6 , inductor L and capacitor C work; when the converter works in Buck-Boost mode, the first switching tube S 1 , the second switching tube S 2 , and the third switching tube S 3. The first diode D 1 , the second diode D 2 , the fourth diode D 4 , the fifth diode D 5 , the sixth diode D 6 , the third diode D 3 , Inductor L and capacitor C work.
本实用新型的有益效果：The beneficial effects of the utility model:
加入Buck-Boost工作模式，解决了Buck PFC变换器固有存在的死区问题，有效地提高了变换器的功率因数。Adding the Buck-Boost working mode solves the inherent dead zone problem of the Buck PFC converter and effectively improves the power factor of the converter.
附图说明Description of drawings
图1是本实用新型的结构图；Fig. 1 is a structural diagram of the utility model;
图2是本实用新型具体实施例在输入电压一个周期内开关序列、输入电流波形图；Fig. 2 is a switching sequence and an input current waveform diagram within one cycle of the input voltage in a specific embodiment of the utility model;
图3a～图3d是本实用新型具体实施例在输入电压正半周内的工作流程图；其中图3a是变换器工作于BUCK-BOOST模式且开关管开通时的电路图，图3b是变换器工作于BUCK-BOOST模式且开关管闭合时的电路图，图3c是变换器工作于BUCK模式且开关管开通时的电路图，图3d是变换器工作于BUCK模式且开关管闭合时的电路图；Figures 3a to 3d are the working flow diagrams of the specific embodiments of the present invention in the positive half cycle of the input voltage; among them, Figure 3a is the circuit diagram when the converter works in BUCK-BOOST mode and the switch tube is turned on, and Figure 3b is the circuit diagram when the converter works in The circuit diagram when the switch tube is closed in BUCK-BOOST mode, Figure 3c is the circuit diagram when the converter works in BUCK mode and the switch tube is turned on, Figure 3d is the circuit diagram when the converter works in BUCK mode and the switch tube is closed;
图4a～图4d是本实用新型具体实施例在输入电压负半轴内的工作过程图；其中图4a是变换器工作于BUCK-BOOST模式且开关管开通时的电路图，图4b是变换器工作于BUCK-BOOST模式且开关管闭合时的电路图，图4c是变换器工作于BUCK模式且开关管开通时的电路图，图4d是变换器工作于BUCK模式且开关管闭合时的电路图。Figures 4a to 4d are working process diagrams of specific embodiments of the present invention in the negative half axis of the input voltage; among them, Figure 4a is a circuit diagram when the converter is working in BUCK-BOOST mode and the switching tube is turned on, and Figure 4b is the working process of the converter The circuit diagram when the switch tube is closed in BUCK-BOOST mode, Fig. 4c is the circuit diagram when the converter works in BUCK mode and the switch tube is turned on, and Fig. 4d is the circuit diagram when the converter works in BUCK mode and the switch tube is closed.
具体实施方式Detailed ways
下面结合实施例及附图，对本实用新型作进一步地详细说明，但本实用新型的实施方式不限于此。The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.
实施例Example
如图1所示，一种降压和升降压切换工作的无桥PFC变换器，包括第一开关管S1、第二开关管S2、第三开关管S3、第一二极管D1、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5、第六二极管D6、电感L和电容C；As shown in Figure 1, a bridgeless PFC converter with buck and buck-boost switching operations includes a first switching tube S 1 , a second switching tube S 2 , a third switching tube S 3 , a first diode D 1 , second diode D 2 , third diode D 3 , fourth diode D 4 , fifth diode D 5 , sixth diode D 6 , inductor L and capacitor C;
所述第一开关管S1的漏极分别与输入电压的一端、第二二极管D2的阴极连接，所述第一开关管S1的源级与第一二极管D1的阳极连接；The drain of the first switching tube S1 is respectively connected to one end of the input voltage and the cathode of the second diode D2 , and the source of the first switching tube S1 is connected to the anode of the first diode D1 connect;
所述第一二极管D1的阴极与第四二极管D4的阴极、第三二极管D3的阳极、第六二极管D6的阳极连接，所述第六二极管D6的阴极与电容C的一端、输出电压的正极连接；The cathode of the first diode D1 is connected to the cathode of the fourth diode D4 , the anode of the third diode D3 , and the anode of the sixth diode D6 , and the sixth diode The cathode of D 6 is connected to one end of the capacitor C and the positive pole of the output voltage;
所述电容C的另一端分别与输出电压的负极和第三开关管S3的源级、电感L的一端连接；The other end of the capacitor C is respectively connected to the negative pole of the output voltage, the source stage of the third switching transistor S3 , and one end of the inductor L;
所述电感L的另一端与第五二极管D5的阳极、第二开关管S2的漏极连接，所述第二开关管S2的源级和第二二极管D2的阳极连接；The other end of the inductor L is connected to the anode of the fifth diode D5 and the drain of the second switch S2 , the source of the second switch S2 is connected to the anode of the second diode D2 connect;
所述第四二极管D4的阳极与输入电压的另一端、第五二极管D5的阴极连接；The anode of the fourth diode D4 is connected to the other end of the input voltage and the cathode of the fifth diode D5 ;
所述第三二极管D3的阴极与第三开关管S3的漏极连接。The cathode of the third diode D3 is connected to the drain of the third switching transistor S3 .
所述第四二极管D4、第五二极管D5、第六二极管D6为快恢复二极管，电容C为电解电容。The fourth diode D 4 , the fifth diode D 5 , and the sixth diode D 6 are fast recovery diodes, and the capacitor C is an electrolytic capacitor.
所述第一二极管D1、第二二极管D2、第三二极管D3用于阻断第一开关管S1、第二开关管S2、第三开关管S3所在支路电流回流。The first diode D 1 , the second diode D 2 , and the third diode D 3 are used to block where the first switching tube S 1 , the second switching tube S 2 , and the third switching tube S 3 are located. Branch current backflow.
当输入电压绝对值|vin|大于输出电压vo时，变换器工作于Buck模式，其中只有第一开关管S1、第二开关管S2、第一二极管D1、第二二极管D2、第四二极管D4、第五二极管D5、第六二极管D6、电感L和电容C工作；When the absolute value of the input voltage |v in | is greater than the output voltage v o , the converter works in Buck mode, in which only the first switch S 1 , the second switch S 2 , the first diode D 1 , the second two Diode D 2 , fourth diode D 4 , fifth diode D 5 , sixth diode D 6 , inductor L and capacitor C work;
当输入电压绝对值vin小于输出电压vo时，变换器工作于Buck-Boost模式，此工作模式下，第一开关管S1、第二开关管S2、第三开关管S3、第一二极管D1、第二二极管D2、第四二极管D4、第五二极管D5、第六二极管D6、第三二极管D3、电感L和电容C工作。When the absolute value of the input voltage v in is smaller than the output voltage v o , the converter works in Buck-Boost mode. In this mode, the first switch S 1 , the second switch S 2 , the third switch S 3 , the third switch A diode D 1 , a second diode D 2 , a fourth diode D 4 , a fifth diode D 5 , a sixth diode D 6 , a third diode D 3 , an inductor L and Capacitor C works.
图3a～图3d和图4a～图4d中实线表示处于工作状态的部分，实线部分电路图表示工作时候的等效电路图。The solid lines in FIGS. 3a to 3d and FIGS. 4a to 4d represent parts in working state, and the circuit diagrams of the solid line parts represent equivalent circuit diagrams in operation.
当变换器工作在输入电压正半周时：When the converter works in the positive half cycle of the input voltage:
当输入电压绝对值vin小于输出电压vo时，此时变换器工作于Buck-Boost模式，如图3a、图3b所示，第一开关管S1和第三开关管S3同时开通和关断，其开关序列如图2中t0～t1阶段以及t2～t3阶段所示。When the absolute value of the input voltage v in is smaller than the output voltage v o , the converter works in the Buck-Boost mode at this time, as shown in Figure 3a and Figure 3b, the first switch S1 and the third switch S3 are simultaneously turned on and Turn off, its switching sequence is shown in the t 0 ~ t 1 stage and the t 2 ~ t 3 stage in Fig. 2 .
当输入电压绝对值vin大于输出电压vo时，此时变换器工作于Buck模式，如图3c、图3d所示，第三开关管S3一直关闭，第一开关管S1工作，其开关序列如图2中t1～t2阶段所示。When the absolute value of the input voltage v in is greater than the output voltage v o , the converter works in Buck mode at this time, as shown in Figure 3c and Figure 3d, the third switching tube S3 is always off, the first switching tube S1 works, and its The switching sequence is shown in the t 1 ~ t 2 stages in Fig. 2 .
当变换器工作在输入电压负半周时：When the converter works in the negative half cycle of the input voltage:
当输入电压绝对值vin小于输出电压vo时，此时变换器工作于Buck-Boost模式，如图4a、图4b所示。第二开关管S2和第三开关管S3同时开通和关断，其开关序列如图2中t3～t4阶段以及t5～t6阶段所示。When the absolute value of the input voltage v in is smaller than the output voltage v o , the converter works in the Buck-Boost mode at this time, as shown in Fig. 4a and Fig. 4b. The second switching tube S 2 and the third switching tube S 3 are turned on and off at the same time, and their switching sequences are shown in the stages t 3 -t 4 and t 5 -t 6 in FIG. 2 .
当输入电压绝对值vin大于输出电压vo时，此时变换器工作于Buck模式，如图4c、图4d所示。第三开关管S3一直关闭，第二开关管S2工作，其开关序列如图2中t4～t5阶段所示。When the absolute value of the input voltage v in is greater than the output voltage v o , the converter works in the Buck mode at this time, as shown in Fig. 4c and Fig. 4d. The third switching tube S 3 is always off, and the second switching tube S 2 is working, and its switching sequence is shown in stages t 4 -t 5 in FIG. 2 .
上述实施例为本实用新型较佳的实施方式，但本实用新型的实施方式并不受所述实施例的限制，其他的任何未背离本实用新型的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本实用新型的保护范围之内。The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227574A (en) * | 2013-04-09 | 2013-07-31 | 华南理工大学 | Bridgeless PFC converter working in Buck mode or Buck-Boost mode |
| WO2015095699A1 (en) * | 2013-12-19 | 2015-06-25 | Texas Instruments Incorporated | Apparatus and method for zero voltage switching |
| US10381953B2 (en) | 2016-10-26 | 2019-08-13 | The University Of Manitoba | Bi-directional electric power conversion circuit with bridgeless buck-boost circuit and reconfigurable capacitor-inductor filter circuit |
| US11916495B2 (en) | 2017-12-15 | 2024-02-27 | Texas Instruments Incorporated | Adaptive zero voltage switching (ZVS) loss detection for power converters |
-
2013
- 2013-04-09 CN CN2013201760224U patent/CN203219195U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227574A (en) * | 2013-04-09 | 2013-07-31 | 华南理工大学 | Bridgeless PFC converter working in Buck mode or Buck-Boost mode |
| WO2015095699A1 (en) * | 2013-12-19 | 2015-06-25 | Texas Instruments Incorporated | Apparatus and method for zero voltage switching |
| US10381953B2 (en) | 2016-10-26 | 2019-08-13 | The University Of Manitoba | Bi-directional electric power conversion circuit with bridgeless buck-boost circuit and reconfigurable capacitor-inductor filter circuit |
| US11916495B2 (en) | 2017-12-15 | 2024-02-27 | Texas Instruments Incorporated | Adaptive zero voltage switching (ZVS) loss detection for power converters |
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