Improved wide load range boost type power factor correction converter

A power factor correction and boost type technology is applied in the field of power factor correction converters to achieve the effects of reducing input current distortion, being easy to implement, and improving power factor.

Inactive Publication Date: 2018-05-01
NANJING UNIV OF SCI & TECH
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  • Abstract
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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

Method used

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  • Improved wide load range boost type power factor correction converter
  • Improved wide load range boost type power factor correction converter
  • Improved wide load range boost type power factor correction converter

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Embodiment Construction

[0021] 1. Main circuit

[0022] like figure 1 Middle: The main circuit 1 and the control circuit 2 are composed.

[0023] The main circuit 1 includes: an AC source 3 , a rectifier bridge circuit 4 , a Boost circuit 5 and a load 6 .

[0024] Its working principle: the invention adopts the algorithm of average current control plus sampling correction to realize power factor correction in the low load range. When the Boost power factor correction converter designed according to the CCM mode works at light load, the inductor current discontinuity will appear near the zero crossing point of the input voltage, and as the load decreases, the discontinuity range expands until the inductor current in the entire power frequency cycle for DCM. The parasitic parameters of the circuit are the main reason for the distortion of the input current of the converter in DCM mode. The present invention adopts the control method of average current control plus sampling correction. When the Boos...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M7/217
CPCH02M1/4225H02M7/217Y02B70/10
Inventor 徐海瑞王瑞霞叶剑桥陆荣刘泽宇
Owner NANJING UNIV OF SCI & TECH
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