Three-phase PFC and PWM modulation method based on BUCK circuit
A modulation method and three-phase technology, applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve problems such as difficult to apply three-phase BUCKPFC
Pending Publication Date: 2021-12-14
BEIJING DESIGN TECH
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Problems solved by technology
[0005] The invention provides a three-phase PFC and PWM modulation method based on a BUCK circuit. The modulation method is based on the existing BUCK circuit and power factor correction (PFC), and performs PWM modulation, which solves the problem that the PWM modulation in the prior art is difficult to apply to three phases. Phase BUCK PFC Conundrum
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[0027] The following is attached Figure 1-6 and the specific implementation mode The three-phase PFC and PWM modulation method based on the BUCK circuit proposed by the present invention will be further described in detail. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and all use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In order to make the objects, features and advantages of the present invention more comprehensible, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementa...
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The invention discloses a BUCK debugging circuit for a three-phase PFC and PWM technology. The BUCK debugging circuit is characterized in that Uan, Ubn and Ucn are divided into two paths; the first path of signals respectively pass through three comparators to obtain high-frequency signals; an anti-logic signal is taken from each high-frequency signal to obtain three anti-logic high-frequency signals, and finally A1-A6 modulation signals are obtained; the second path is compared pairwise through three comparators in sequence to obtain maximum value signals, and then the maximum value signals are respectively subjected to inverse logic to obtain B1-B6; B1 and B5, B2 and B6, B3 and B1, B2 and B4, B3 and B5, and B4 and B6 are respectively subjected to AND logic to obtain signals C1-C6, C1 and C2, C3 and C4, and C5 and C6 are subjected to OR operation to respectively obtain D1-D3; OR operation is performed on the modulation signals A1-A6, and then NOT operation is performed to obtain a high-frequency modulation signal E; AND operation is performed on E and D1-D3 to obtain modulation signals F1-F3; or operation is performed on the modulation signals A1, A2 and F1, A3, A4 and F2, A5, A6 and F3, and finally needed six modulation logic signals are obtained.
Description
technical field [0001] The invention relates to the technical fields of power factor correction (PFC) and pulse width modulation (PWM), in particular to a three-phase PFC and PWM modulation circuit and modulation method based on a BUCK circuit. Background technique [0002] With the wide application of power electronic devices, especially the use of many low power factor power electronics, a large number of harmonics will be generated in the power grid, which will have a certain impact on the quality of power supply and power grid loss. Applying power factor correction (PFC) technology to power In electronic equipment, it can effectively reduce the impact of harmonics on the power grid and improve equipment efficiency. [0003] At present, single-phase PFC technology has matured day by day, and three-phase PFC technology is becoming a major research topic in the field of power supply because of its technical difficulty. Among the many three-phase PFC circuits, the three-pha...
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IPC IPC(8): H02M1/42H02M1/088
CPCH02M1/4233H02M1/088Y02B70/10
Inventor 王军华
Owner BEIJING DESIGN TECH