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Method and apparatus to control a power factor correction circuit

A technology of power factor correction and controller, which is applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., and can solve problems such as power factor reduction

Active Publication Date: 2010-06-16
POWER INTEGRATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power factor decreases below unity as the harmonic distortion and / or phase shift of the input current relative to the ac source voltage increases

Method used

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  • Method and apparatus to control a power factor correction circuit
  • Method and apparatus to control a power factor correction circuit

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Embodiment Construction

[0025] In one aspect of the invention, methods and apparatus disclosed herein for illustrative purposes use a power converter to provide power factor correction to an input current waveform. In the following description, numerous specific details are provided in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In order to avoid obscuring the present invention, well-known methods related to the implementations have not been described.

[0026] Throughout this specification, "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention . Thus, appearances of the phrases "in one embodiment," "in an embodiment," "in one example," or "in an ...

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PUM

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Abstract

A method and apparatus to control a power factor correction circuit. A controller for use in a power factor correction (PFC) converter is disclosed. An example controller includes an integrator coupled to receive a voltage sense signal responsive to a magnitude of an ac voltage source. The ac voltage source is coupled to an input of the PFC converter, which is coupled to an energy transfer element, which is coupled to a power switch. The integrator is further coupled to receive a current sense signal responsive to a current flowing in the power switch when the power switch is on. The integrator is to generate an integrator output signal in response to the voltage sense signal and the current sense signal. On / off logic is to be coupled to drive the power switch on and off to control a transfer of energy through the energy transfer element to a load coupled to an output of the PFC converter. The on / off logic is coupled to terminate an on time of the power switch when the integrator output signal reaches a threshold value. A gain of the integrator circuit is adjusted in response to the voltage sense signal such that the threshold value is substantially constant independent of the magnitude of the ac voltage source when a magnitude of the load is constant.

Description

technical field [0001] The present invention relates generally to power supplies, and more particularly, the present invention relates to power supplies that provide power factor correction. Background technique [0002] Power supplies are generally used to convert alternating current ("ac") power provided by an outlet to direct current ("dc") for supply to electrical equipment or loads. An important consideration in power supply design is the shape and phase of the input current drawn from the ac source relative to the ac input voltage waveform. The voltage waveform of mains ac source is usually sinusoidal. However, due to the non-linear load that many switched mode power supplies present to the ac source, the waveform shape of the current drawn by the power supply from the ac source is not sinusoidal and / or out of phase with the ac source voltage waveform. This leads to increased losses in the ac mains distribution system, and in many parts of the world it is now legally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCY02B70/126H02M2001/0022G05F1/10H02M1/4225Y02B70/10H02M1/0022
Inventor 罗兰·塞尔威尔·赛恩特-皮埃尔
Owner POWER INTEGRATIONS INC