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A new seven-segment svpwm modulation method

A modulation method, a seven-segment technology, applied in the field of seven-segment SVPWM modulation, can solve the problems of bridge arm switching tube through-through, reduce the number of switching, etc., to reduce the number of switching times, small harmonic content, avoid through-through and The effect of the reverse power phenomenon

Active Publication Date: 2020-03-27
山东中科创智能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention proposes a new seven-segment SVPWM modulation method, which can not only further reduce the number of switches, but also avoid the phenomenon of straight-through of the upper and lower bridge arm switch tubes and the generation of reverse power

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  • A new seven-segment svpwm modulation method

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0022] figure 1 It is a schematic diagram of the AC-DC control example process of the method of the present invention, figure 2 It is a schematic diagram of the DC-AC control example process of the method of the present invention, that is, the method of the present invention is not only applicable to figure 1 shown in the AC-DC conversion process, the same applies to figure 2 The DC-AC conversion process shown. As shown in the two figures, each control module and its functions are the same, including a voltage detection module 11, an acquisition module 12, a control module 13 and a three-phase bridge circuit.

[0023] The voltage detection module 11 is used to detect the size of u, v, w three-phase voltage, and completes the comparison of its size, determines the phase voltage in the maximum or minimum voltage range in the three-phase voltage, according to the de...

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Abstract

The present invention proposes a new seven-segment SVPWM modulation method. The hardware implementation of the modulation method includes a voltage detection module, an acquisition module and a control module. The modulation method is based on the traditional seven-segment modulation method , by detecting the magnitude of the three-phase voltage, the corresponding switch tube is turned off within the maximum and minimum value range of each phase voltage, and the traditional seven-segment modulation method is adopted in the non-maximum and minimum value range. The beneficial effects of the present invention are: on the basis of the seven-stage type, the switching times are reduced, that is, the switching loss is reduced, and the switch tube is closed within a certain voltage range to prevent the direct phenomenon and the generation of reverse power.

Description

technical field [0001] The invention relates to a PWM modulation method, in particular to a new seven-segment SVPWM modulation method. Background technique [0002] Voltage Space Vector Pulse Width Modulation (SVPWM) is a relatively novel control method. Its principle is to use different combinations of switch control signals of each bridge arm of the inverter to make the running track of the output voltage space vector of the inverter approximately close to round. Compared with SPWM, SVPWM has small harmonic components and is easier to realize digitization. [0003] The theoretical basis of SVPWM is the principle of average value equivalent, that is, the average value is equal to the given voltage vector by combining the basic voltage vectors within one switching cycle. At a certain moment, the rotation of the voltage vector into a certain region can be realized by different combinations in time of two adjacent non-zero vectors and zero vectors that make up this region. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M7/5395H02M1/38
CPCH02M1/38H02M7/53875H02M7/5395H02M1/0054H02M7/53876Y02B70/10
Inventor 侯典立
Owner 山东中科创智能源科技有限公司