Full digit single period power factor correction circuit based on triangular wave pulse modulation

Abstract

The invention belongs to the electric power electronic technology field and discloses a full digit single period power factor correction circuit based on triangular wave pulse modulation. The full digit single period power factor correction circuit based on triangular wave pulse modulation comprises a Boost power converter, a digital analog conversion circuit and a control circuit, wherein the control circuit comprises an output voltage difference module, a voltage loop circuit compensation module, a value calculating module, a PWM module and a grid driving module. The beneficial effects are that: the full digit single period power factor correction circuit discloses by the invention can obtain the average value of the Boost inductor current without the needs of the input current sampling circuit of the complicated structure or the high speed digital analog converter, and guarantee that the single-period PDC converter obtains the high power factor and low THD under the full loading condition through a relatively simple control structure and relatively less control circuit hardware resources.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to an all-digital single-cycle power factor correction circuit based on triangular wave pulse modulation. Background technique [0002] Simple structure and good dynamic characteristics make Boost topology the most common power factor corrector (PFC) topology. Many control methods about Boost PFC have been proposed, including the average current method, peak current method and hysteresis control method. Although they have their own advantages, they all have disadvantages such as complex control loop, large number of acquisition signal channels, and inaccurate control. Single-cycle control technology is a nonlinear large-signal pulse width modulation (PWM) control theory developed in the early 1990s, and it is also an analog PWM control technology. It controls the duty cycle of the switching tube so that the average value of the switching variable in each sw...

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Problems solved by technology

[0005] What the present invention aims to solve is that it is difficult to realize the digital control of single-cycle PFC. The key lies in the difficulty of obtaining the average current of the inductor in the switching cycle, which requires the consumption of a large amount of hardware resources and the defect of designing a complicated current sampling circuit. A triangular wave pulse based Modulated all-digital single-cycle power factor correction circuit

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