Over-sampling signal processing method for PWM (pulse width modulation) sampling control system
A signal processing and control system technology, applied to electric controllers, controllers with pulse train output signals, etc., can solve the problems that affect the transient response speed of the control system, high-frequency signal tracking ability, signal bandwidth limitation, etc.
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[0022] figure 1 It is a structural schematic diagram of an embodiment of the present invention. This is a typical PWM oversampling feedback control system, including PWM circuit, controller, oversampling signal processing unit, anti-aliasing filter, carrier frequency setting unit and sampling frequency setting unit. The controller, the oversampling signal processing unit, the carrier frequency setting unit and the sampling frequency setting unit are realized by a DSP chip through programs and corresponding hardware circuits. The oversampling signal processing unit is actually a piece of computer program, which implements the oversampling signal processing method proposed by the present invention. Carrier frequency and sampling frequency can run autonomously, also can keep synchronous relation by certain method (such as PLL or frequency divider), in the present embodiment, PWM carrier frequency is 10kHz, and sampling frequency is 80kHz, is controlled by the internal of same ch...
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