Improved wide load range boost type power factor correction converter

Abstract

The invention discloses an improved wide load range boost type power factor correction converter, comprising a main circuit (1) and a control circuit (2). The main circuit (1) comprises an AC source (3), a rectifier bridge circuit (4), a Boost circuit (5), and a load (6). The control circuit (2) comprises a sampling correction module (7), a voltage loop module (8), a current loop module (9), and aPWM module (10). The invention is characterized in that the output of the AC source (3) is connected to the input of the rectifier bridge circuit (4), turning into steamed bread wave, which is used as the input end of the Boost circuit (5); the load (6) is connected to two ends of the output capacitor (Co) of the Boost circuit (5) in parallel; the control circuit parts (7, 8, 9, 10) are control signals in the internal DSP; the output of the sampling correction module (7) and the voltage ring module (8) is used as the input of the current ring module (9), and the output of the current ring module (9) is used as the input of the PWM module (10). The invention is advantageous in that when a converter works in a CCM mode, the correction method brought forward will not affect the duty ratio; as for the PFC converter with wide-load range, the same program is adopted for correction, and the calculation time of the program can be reduced.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to power factor correction converters with a wide load range. Background technique [0002] Among many power electronic topologies, Boost converters are widely used as PFC circuits because of their simple topology, high conversion efficiency, and easy implementation of control strategies. According to whether the inductor current is continuous, the boost converter can be divided into three types: continuous conduction mode (CCM), critical continuous conduction mode (CRM) and discontinuous conduction mode (DCM). The fixed-load Boost power factor correction (PFC) converter selects the working mode of the inductor current according to the size of the output power. Boost PFC converters that work in discontinuous conduction mode during the full power frequency cycle are generally suitable for low-power applications. When working in medium and high power occasions, t...

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Problems solved by technology

However, this method ignores the influence of circuit parasitic parameters on the inductor current, and there is a certain error

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