Digital monocyclic control method of PFC converter

A single-cycle control and converter technology, which is applied in the field of digital single-cycle control, can solve the problems of difficulty in ensuring control accuracy and difficult control implementation, and achieves the effects of perfect control accuracy, improved single-cycle control accuracy, and high control accuracy.

Inactive Publication Date: 2009-09-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] In recent years, people have conducted in-depth research on the theory, application feasibility, modeling analysis, and steady-state and dynamic performance research of single-cycle control. However, the current research on single-cycle controllers is realized by me

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  • Digital monocyclic control method of PFC converter
  • Digital monocyclic control method of PFC converter
  • Digital monocyclic control method of PFC converter

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0026] With the rapid development of digital signal processing technology, due to the continuous improvement of its control theory and implementation means, digital control has highly integrated control circuits, precise control accuracy, and perfect communication capabilities and comprehensive power management functions. An important research direction of power electronics.

[0027] Such as figure 1 As shown, the present invention provides a digital single-cycle control method for PFC converter applications, and the circuit is composed of a single-tube PFC main circuit and a DSP controller, that is, a microcontroller. The DSP controller samples the output voltage and the inductor current and sends them to the two AD channels of the DSP. The system first passes the sampled output voltage value through the voltage PI adjustment loop to control the output voltage c...

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Abstract

The invention discloses a digital monocyclic control method of a PFC converter. The method comprises the following steps: firstly, sampling an output voltage and an inductor current, adopting a digital signal processor so that an output voltage sampling value passes by a voltage PI adjusting ring while utilizing the synchronous sampling function of the digital signal processor to finish the peak value sampling of the inductor current so as to ensure the monocyclic control requirements; and then obtaining a PWM control signal of a power device by a digital monocyclic core control algorithm. The digital monocyclic control method can be adopted to effectively simplify the digital control structure of PFC, improves the real-time computational capability and the control effect of a system and overcomes the adverse influence of discrete parameters of devices, such as operational amplifiers, capacitors, and the like in a traditional monocyclic control resettable integrator. In addition, the system fully keeps the accordance between a sampling interface and traditional PFC while fully keeping the advantages such as precisely controlled precision, perfect communication capability, and the like of traditional digital control.

Description

technical field [0001] The invention relates to a digital single-cycle control method of a PFC converter, which belongs to the technical field of power factor correction application and related digital control technology of electric energy conversion devices. Background technique [0002] The single-cycle control technology is a new type of large-signal and nonlinear control method proposed by American scholars Keyue M.Smedley and Slobodan Cuk. It uses the pulse modulation and nonlinear characteristics of the switching converter to achieve real-time voltage and current average value Instantaneous control can suppress input disturbance within one switching cycle, so that the output can effectively track the reference signal, and has the characteristics of fast response, good robustness and adaptability. Currently, the application of single-cycle control has involved various fields, such as DC / DC conversion, power factor correction, active power filter, uninterruptible power s...

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Application Information

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IPC IPC(8): H02M7/21H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 陈新蒋真凌雁波龚春英王慧贞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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