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A PWM modulation device, power electronic equipment and PWM modulation method thereof

A technology of power electronics and equipment, which is applied in the direction of pulse duration/width modulation, etc., and can solve the problems such as the complexity of PWM generation waveform process

Active Publication Date: 2020-07-07
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to, in view of the above defects, provide a PWM modulation device, power electronic equipment and its PWM modulation method, so as to solve the problem of complicated PWM generating waveform process and achieve the effect of simplifying the PWM generating waveform process

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  • A PWM modulation device, power electronic equipment and PWM modulation method thereof
  • A PWM modulation device, power electronic equipment and PWM modulation method thereof
  • A PWM modulation device, power electronic equipment and PWM modulation method thereof

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Embodiment Construction

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] According to an embodiment of the present invention, a PWM modulation device is provided. see figure 1 A schematic structural view of an embodiment of the device of the present invention is shown. The PWM modulation device may include: a comparing unit; the comparing unit may include: a first comparator.

[0035] Wherein, the first comparator can be used...

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Abstract

The invention discloses a PWM device, power electronic equipment and a PWM method of the power electronic equipment. The PWM device comprises a comparison unit, wherein the comparison unit comprises a first comparator used for comparing a first modulation wave with a second modulation wave to generate a PWM waveform; the frequency of the PWM waveform can be changed within a set frequency range; and the duty ratio of the PWM waveform can be controlled according to the use requirement. According to the scheme, the problem that the PWM waveform generation process is complex can be solved, and the effect of simplifying the PWM waveform generation process is achieved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a PWM modulation device, power electronic equipment and a PWM modulation method thereof, in particular to a spectrum widening PWM modulation method, household appliances, frequency converters and electric vehicles. Background technique [0002] Pulse Width Modulation (PWM) is a voltage modulation method widely used in the field of power electronics, especially switching power supplies and frequency converters. It is equivalent to simulating low-frequency voltage waveforms through volt-second balance. One way to generate the PWM waveform is to compare the reference waveform with the sawtooth wave. The sawtooth wave can be a triangular wave with symmetrical rise and fall times, or a waveform with asymmetric rise and fall times. [0003] The waveform generation process of traditional PWM is complex, requiring complex nonlinear calculation links such as integral...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M9/00H03K7/08
CPCH03K7/08
Inventor 曾颖宇肖彪万今明王攀孙家文
Owner GREE ELECTRIC APPLIANCES INC