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Method and apparatus for active power factor correction

一种功率因子校正、控制装置的技术，应用在输出功率的转换装置、能源产业、高效电力电子转换等方向，能够解决输出电压纹波大等问题，达到改善传导EMI的效果

Active Publication Date: 2008-11-05
BEELAB SEMICON
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PFM method is not suitable for conventional single-stage AD / DC converters without a power factor correction pre-stage because of the large output voltage ripple at moderate loads
However, this is not a concern for a two-stage AC / DC converter with a power factor corrector as the front stage and a DC / DC converter as the second stage

Method used

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  • Method and apparatus for active power factor correction
  • Method and apparatus for active power factor correction
  • Method and apparatus for active power factor correction

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Embodiment Construction

[0027] The invention will now be described by the following examples. The above-mentioned embodiments are not intended to limit the scope of the present invention but merely to illustrate the present invention. All features and combinations described in the embodiments are not necessarily essential to the present invention.

[0028] with reference to the attached Figure 1-6 The preferred embodiment of the invention and its advantages are best understood. Like numerals are used for like and corresponding parts of the various drawings.

[0029] figure 1 An embodiment of the invention is shown when the controlled AC / DC converter is a boost converter. The power factor correction device 10 includes an adder 101 , an average filter 102 , a ramp signal generator 103 , a comparator 104 and a pulse generator 105 . Comparator 12 generates error signal VERR, then multiplier 11 generates sinusoidal current reference signal IRFF for the device. The level of the sinusoidal current re...

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Abstract

A power factor correction method and apparatus which use Pulse Frequency Modulation (PFM) to control an AC / DC converter is disclosed. The average current drawn by the AC / DC converter is compared with a reference sinusoidal signal and the error is used to determine the switching frequency. The switching frequency varies with the sinusoidal reference signal such that the converter emulates a resistive load. By using PFM control, EMI is spread over a range rather than concentrated at a few frequencies. Since the switching frequency decreases with the loading of the converter, the switching loss decreases with the loading as well. Thus, the need of meeting efficiency standards, e.g. the 80 PLUS and Energy Star, can be fulfill without extra circuitry.

Description

technical field [0001] The invention relates to the field of switching power supplies. More specifically, the present invention relates to controlling the operation of an AC / DC converter using pulse frequency modulation to achieve high power factor and low standby power at light loads. Background technique [0002] All power supply units connected to the AC grid must now meet the European standard EN-61000-3-2 or similar harmonic limits in other countries. In the future there will be further requirements to meet efficiency standards such as 80PLUS and Energy Star (Energy Star). The existing technologies that can meet the requirements of EN-61000-3-2 can be divided into two categories. [0003] The first type (US4437146, US5134355, US5654880, US6900623, US2006 / 0158912) uses a feedback loop to detect the rectified AC voltage and control the operation of the converter so that the input current from the converter follows the change of the rectified AC voltage. This type has f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42G05F1/70
CPCY02B70/126G05F1/70H02M1/4258H02M1/4225Y02B70/10Y02P80/10
Inventor 吴锡伟
Owner BEELAB SEMICON
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