PWM control time sequence sampling period transient frequency measurement circuit

Abstract

Disclosed is a PWM control time sequence sampling period transient frequency measurement circuit. A DDS technology is adopted to perform frequency division processing on a reference time sequence so as to obtain a standard sampling time period signal. A DDS technology is adopted to carry out frequency division processing on a PWM control time sequence, on one hand, the frequency of the PWM controltime sequence is reduced through a digital frequency division technology on the premise that the frequency stability of the original PWM control time sequence is not changed, and the purpose of widening the frequency range of the PWM control time sequence is achieved, and on the other hand, after digital frequency division processing, a measured clock signal with very accurate frequency can be obtained. A measurement module is introduced, and when a periodic sampling clock signal edge arrives, the optimal phase difference between the PWM control time sequence and the reference time sequence at the moment is judged according to the inherent minimum resolution measurement range of the measurement module, so that a corresponding counter is enabled to work. The measurement of the transient frequency in the PWM control time sequence sampling period can be completed, and the measurement precision can be improved as required.

Description

technical field [0001] The invention belongs to the technical field of transient frequency in a PWM sampling period, and in particular relates to a transient frequency measurement circuit of a PWM control timing sampling period. Background technique [0002] The stepper motor is also called the pulse motor. It works on the basis of the most basic electromagnet principle. It is a free-rotating electromagnet. From 1830 to 1860; Around 1870, it was tried to apply it to the electrode delivery mechanism of the hydrogen arc lamp for the purpose of control, which is considered to be the original stepping motor. At the beginning of the 20th century, stepper motors were widely used in automatic telephone exchanges. As Western capitalist powers scrambled for colonies, stepper motors found widespread use in stand-alone systems such as ships and aircraft that lacked AC power. In the late 1950s, the invention of transistors was gradually applied to stepping motors, and digital control ...

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Problems solved by technology

Analog circuits can also be sensitive to noise, any disturbance or noise can change the magnitude of the current value

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