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Model-free power control method for PFC (Power Factor Correction) AC/DC converter

A technology of power control and converter, which is applied in the direction of converting AC power input to DC power output, output power conversion device, high-efficiency power electronic conversion, etc. Problems such as high-efficiency operation of DC converters and limited service life of electrolytic capacitors can achieve the effects of improving dynamic performance and steady-state performance, increasing service life, and improving dynamic performance

Active Publication Date: 2017-07-14
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a PFC AC / DC converter model-free power control method to solve the slow dynamic response of the PFC AC / DC converter and the limited service life of the electrolytic capacitor and the fixed PFC AC / DC converter existing in the prior art. The output voltage directly affects the technical deficiencies in the high-efficiency operation of the post-stage DC / DC converter in a wide load range

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  • Model-free power control method for PFC (Power Factor Correction) AC/DC converter

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Embodiment Construction

[0053] In this embodiment, the model-free power control method of the PFC AC / DC converter is applied to an electric vehicle on-board charger, figure 1 The PFC AC / DC converter system shown includes a single-phase Boost circuit, AC input voltage v in Detection conditioning circuit, inductor current i in Detection and conditioning circuit, reference input power generation module, model-free control law module, charging power curve module and PWM modulation module, in which the single-phase Boost circuit includes AC power supply AC, diode uncontrolled rectifier bridge Bridge, inductor L, power switching device S, Diode D, output DC side capacitor C and load; for the convenience of expression, figure 1 The indiscriminate unity of the AC input voltage detection and conditioning circuit and the inductor current detection and conditioning circuit is represented by the detection and conditioning circuit ADC.

[0054] The model-free power control method of the PFC AC / DC converter in...

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Abstract

The invention discloses a model-free power control method for a PFC (Power Factor Correction) AC / DC converter, which is characterized in that input power of the PFC AC / DC converter is enabled to act as a controlled variable so as to realize closed-loop operations of a system, and a model-free control law is generated based on a model-free control algorithm. The model-free power control method comprises the steps of acquiring reference input power of the PFC AC / DC converter according to load demanded power of the PFC AC / DC converter; generating a model-free control law based on the model-free control algorithm according to the input power and the reference input power of the PFC AC / DC converter; generating driving control signals through PWM (Pulse Width Modulation) so as to control the PFC AC / DC converter, and realizing power factor correction and AC-DC conversion of electric energy. According to the invention, the dynamic response of a PFC AC / DC converter system can be improved, the robustness of the system in a wide load range is improved, adaptive changes of output voltage of the converter along with the load are realized, implementation of an electrolytic capacitor-free design of the converter is facilitated, and the operation efficiency, the safety and the reliability of the system are improved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a model-free power control method for a PFC (Power Factor Correction, power factor correction) AC / DC converter. Background technique [0002] When the traditional AC / DC converter is running, the grid-side power factor is usually between 0.6 and 0.7, and the converter injects a large amount of harmonic current into the grid. The low power factor of the converter grid side directly affects the efficient and reliable operation of the grid. Therefore, According to the requirements of relevant national standards on the power factor and harmonic current of electrical equipment, it is necessary to add a power factor correction link to the AC / DC converter. like Figure 11 As shown, in order to meet the requirements of power factor correction and DC output voltage control accuracy at the same time, the AC / DC converter is usually composed of an AC / DC converter with PFC fun...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/42
CPCH02M1/4233H02M7/219Y02B70/10
Inventor 李红梅张恒果曹灵灵崔超周亚男
Owner HEFEI UNIV OF TECH
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