Regular sampling PWM optimization method for digital control system
A technology of digital control system and optimization method, which can be applied to electric controllers, controllers with pulse train output signals, etc., and can solve problems such as SPWM control errors.
Active Publication Date: 2019-06-18
爱士惟科技股份有限公司
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However, there is a large error between the symmetrical regular sampling method and the actual modulated wave, such as figure 1 As shown, there is a large error between point C, point D and point A, and the generated SPWM will introduce a certain control error
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[0040] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.
[0041] The invention provides a regular sampling PWM optimization method for a digital control system, and an optimization system for executing the regular sampling PWM optimization method includes: a microprocessor and a sine modulation wave generator. Among them, the microprocessor has a built-in AD conversion module (10-bit or 12-bit conversion di...
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The invention discloses a regular sampling PWM optimization method for a digital control system. The method can improve the degree of approximation to modulated waves. The method includes the following steps that: normalization processing is performed on sinusoidal modulated waves and symmetric triangular carrier waves; the sinusoidal modulated waves are sampled, so that the zero-crossing point position or waveform position information of the sinusoidal modulated waves is obtained; time synchronization calibration is performed on the starting points of outputted symmetric equidistant square waves or symmetric triangular carrier waves; an AD sampling starting triggering time point and the period starting time point of the symmetric equidistant square waves are synchronized; an AD sampling period Ts is set to be 1 / 2n of the period of the square waves; AD sampling is performed, an obtained AD sample numerical value is converted into S(x); the numerical value of the symmetric triangular carrier waves corresponding to a time point when the AD sampling is performed is calculated, and is denoted as H(x); H(x) is compared with S(x), when H(x) is smaller than S(x), acquisition time T(A) iscalculated according to S(x) at this moment; when the H(x) is larger than S(x), acquisition time T(B) is calculated according to S(x) at this moment; and the input numerical value of a PWM register iscalculated according to T(B) and T(A), and a duty ratio is outputted.
Description
technical field [0001] The invention belongs to the field of digital power supplies, and relates to a regular sampling PWM (Pulse Width Modulation, PWM for short) optimization method of a digital control system. Background technique [0002] With the development of power electronics technology, PWM technology derived from communication technology has been rapidly applied in the field of power electronics technology. Forming methods of sinusoidal pulse width modulation (SPWM) waveform usually include natural sampling method and symmetrical regular sampling method. [0003] The natural sampling method obtains the intersection point of the high-frequency triangular carrier wave and the modulating wave through calculation to determine the switching, derive the pulse width, and generate the SPWM waveform. The natural sampling method can accurately obtain the width and time of pulse generation, and generate a more perfect SPWM waveform. However, the pulse width calculation formu...
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IPC IPC(8): G05B11/28
Inventor 张勇王进城廖小俊
Owner 爱士惟科技股份有限公司