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A peak current control method of pfc current discontinuous mode

A technology of peak current control and current discontinuous mode, which is applied in the field of peak current control of PFC current discontinuous mode, to achieve the effect of simple design, easy implementation and improved power factor

Inactive Publication Date: 2017-06-06
FUZHOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to propose a peak current control method of PFC current discontinuous mode, which overcomes the problem that the peak value control is difficult to use under the DCM mode, and improves the power factor

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  • A peak current control method of pfc current discontinuous mode
  • A peak current control method of pfc current discontinuous mode
  • A peak current control method of pfc current discontinuous mode

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, the present embodiment provides a peak current control method of a PFC current discontinuous mode. For the convenience of analysis, the text description of the present invention treats the sampling coefficient as 1, which specifically includes the following steps:

[0028] Step S1: Connect the rectified AC mains to a Boost circuit, and determine the switching period T, inductance L and output reference voltage U of the Boost circuit ref , and the switching period T, inductance L and output reference voltage U ref input into a controller;

[0029] Step S2: Sampling the input voltage U of the Boost circuit in , output voltage U o and the inductor current I L , and the input voltage U in , output voltage U o and the inductor current I L input into said controller;

[0030] Step S3: The controller according to the...

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Abstract

The invention relates to a PFC (Power Factor Correction) discontinuous current mode peak current control method. The method comprises the following steps: connecting an alternating current mains supply to a Boost circuit after being rectified, and inputting the switching period T, the electrical inductance L, the output reference voltage Uref, the input voltage Uin, the output voltage Uo and the inductive current IL of the Boost circuit into a controller; calculating by the controller to obtain a current peak value Ipeak corresponding to the current switching period, comparing the Ipeak with the IL, and controlling the switch of a switch tube, so that the peak value of the inductive current in each switching period is in curve fit with the peak value. The method is suitable for conditions in an inductive discontinuous current mode (DCM), the problem that the control for the peak value is difficult to use in the DCM, the power factor is improved, and the method is simple in design and easy realized.

Description

technical field [0001] The invention relates to the field of power electronic control, in particular to a peak current control method of a PFC current discontinuous mode. Background technique [0002] In the power factor correction device, according to whether the inductor current is continuous or not, the PFC can be divided into three operating modes, namely continuous mode (CCM), critical mode (CRM), and discontinuous mode (DCM). The DCM operating mode has the advantages of zero-current switching of the switch tube and no reverse recovery time of the boost diode, and is often used in low-power applications. DCM control is commonly used for open-loop control, that is, the duty cycle can be obtained without comparing the sampled inductor current with the reference current The actual current cannot be effectively monitored. Some researchers proposed to sample the current, and to increase the above duty cycle and correct a term d'=k p (I ref -kI L )+k i ∫(I ref -kI L ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M7/217
CPCY02B70/10Y02P80/10
Inventor 王武闫凯歌林琼斌蔡逢煌柴勤勤
Owner FUZHOU UNIV
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