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Power factor correction converter with wide load range

A power factor correction and converter technology, which is applied in output power conversion devices, high-efficiency power electronic conversion, energy industry, etc., can solve problems such as difficulty in achieving stable and precise control, lack of current loops, and sensitivity to changes in circuit parameters. To achieve the effect of easy implementation, small amount of modification and stable control

Inactive Publication Date: 2017-05-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, because DCM predictive current control lacks a current loop and is sensitive to changes in circuit parameters, it is difficult to achieve stable and precise control

Method used

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  • Power factor correction converter with wide load range
  • Power factor correction converter with wide load range
  • Power factor correction converter with wide load range

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Experimental program
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Embodiment Construction

[0022] 1. Main circuit

[0023] like figure 1 Middle: The main circuit 1 and the control circuit 2 are composed.

[0024] The main circuit 1 includes: an AC source 3 , a rectifier bridge circuit 4 , a Boost circuit 5 and a load 6 .

[0025] Its working principle: the invention adopts the algorithm of corrected average current control plus duty cycle feedforward control to realize power factor correction in a wide 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 inconsistency between the sampled inductor current and the average value is the main reason for the distortion of the input current. The corrected average current control plus duty cycle feed-forward control method adopt...

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Abstract

The invention discloses a power factor correction converter with a wide load range. When the converter works in a CCM mode in a full load way, traditional average current control is used as a control strategy; and when the converter works in MCM and DCM modes in a light load way, improved average current control is used as the control strategy. Inductive current sampling correction is increased so that the current obtained by sampling equals to an average value, the feedforward value of duty ratios suitable for CCM and DCM modes undergoes mode discrimination and is then added to a duty ratio calculated by a current loop to obtain a final duty ratio which is used to control a switch tube, and power factor correction is realized. The power factor correction converter with the wide load range overcomes the problems that a traditional PFC converter needs to change a hardware circuit and a control algorithm when working in the light load way, average current control is combined with duty ratio feedwarding to solve the problem that prediction current control is sensitive to circuit parameters, more stable control is easy to realize, and a DCM algorithm based on average current is low in change amount and easy to realize.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a wide load range power factor correction converter. 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, the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4225Y02B70/10Y02P80/10
Inventor 李强宋俊超谭畅邵立伟赵怀友
Owner NANJING UNIV OF SCI & TECH
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