A PWM synchronization method and device
A technology for synchronizing requests and synchronizing clocks, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., and can solve problems such as low synchronization accuracy and network constraints
Active Publication Date: 2017-01-04
HUAWEI DIGITAL POWER TECH CO LTD
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However, the inventor found in the process of implementing the present invention that the synchronization accuracy of this solution in the prior art is not high due to the influence of factors such as the length of the synchronization control signal line and the PWM cycle; The practice of synchronous control signal lines also restricts the networking
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[0082] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0083] In the following detailed description, numerous specific details are set forth in order to provide a complete understanding of the present invention, but those skilled in the art will understand that the present invention may be practiced without these specific details. In other embodiments, well-known methods, procedures, components and circuits have not been described in detail so as not to unnecessarily obscure the embodiments.
[0084] figure 1 It is a ...
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The embodiment of the invention discloses a PWM synchronization method and device. The method includes the steps that a synchronization request message is sent to a previous node and the sending time T1 is recorded; a synchronization feedback message sent by the previous node is received and the receiving time T4 is recorded, wherein the synchronization feedback message includes the time T2 when the previous node receives the synchronization request message and the time T3 when the previous node sends the synchronization feedback message; a time offset message offset of a current node and the previous node is acquired according to T1, T2, T3 and T4; the synchronization clock of the current node is adjusted according to the offset so that the synchronization between the current node and the previous node can be achieved; synchronized PWM is generated according to the synchronization clock. Due to the adoption of the PWM synchronization method and device, the uniform synchronization clock is formed between all nodes through pairwise interaction so that PWM can be generated, and accordingly high-precision PWM synchronization can be achieved.
Description
technical field [0001] Embodiments of the present invention generally relate to the technical field of PWM synchronization, and in particular, relate to a PWM synchronization method and device. Background technique [0002] At present, PWM (Pulse Width Modulation, pulse width modulation) synchronization technology is widely used. For example, in the field of modular frequency conversion drives, there are often situations where multiple power modules are used to drive high-power motors at the same time. At this time, it is necessary to control the PWM synchronization of each module to ensure that the current of each module is equal and reduce the circulating current. [0003] Each module generally has its own local inherent clock sysClock, and the pwmClock clock used for PWM is usually obtained by multiplying the frequency of sysClock. Since the frequency stability of the commonly used crystal oscillator is + / -50ppm, that is, the crystal oscillator itself may have a deviatio...
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IPC IPC(8): H04L7/033H04L7/027
Inventor 邹国明张斌冯剑郭欢冯瑞明
Owner HUAWEI DIGITAL POWER TECH CO LTD