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Power factor correction circuit

A power factor correction and circuit technology, which can be used in output power conversion devices, electrical components, and the conversion of irreversible AC power input to DC power output, which can solve the problem of high cost

Inactive Publication Date: 2010-05-26
FLEXTRONICS AP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this configuration is that it reduces the power loss in switch Q at low AC input voltage, but the disadvantage is that it requires large and expensive power components (for example, inductor L, switch Q and diode D) in order to accommodate the heavy duty load conditions

Method used

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Embodiment Construction

[0021] While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and described in detail herein. It should be understood, however, that there is no attempt to limit the invention to the particular forms disclosed, but on the contrary, the invention is to cover all modifications, equivalents and alternatives falling within the scope and spirit of the invention as defined by the claims.

[0022] figure 2 An exemplary application of power converter 34 is illustrated. As shown, power converter 34 may be incorporated as a component in power supply 32 for consumer devices 36 . A consumer device may be a portable computing device (such as a laptop, personal digital assistant, tablet PC, etc.), or a desktop computer, mobile phone, portable music player, or the like. Power supply 32 may be used to modify the output from AC power source 30 into a form suitable for consumer device 36 (ie,...

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PUM

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Abstract

A power converter that is operable to convert AC power into DC power that may be delivered to a load. The power converter operates to bypass a power factor correction (PFC) circuit during a portion of each AC power cycle. The power converter bypasses the PFC circuit when an AC input voltage is greater than a DC output voltage. The power converter may also include sensing circuitry to sense the AC input voltage and the DC output voltage of the power converter. The power converter may include one or more diodes that function to deliver power directly to a load when the AC input voltage is greater than the DC output voltage, thereby bypassing the PFC circuit. The DC output voltage of the power converter may be regulated to a level that is less than the peak AC input voltage.

Description

technical field [0001] The invention relates to a power factor correction circuit. Background technique [0002] Electronic devices such as laptops, desktop computers, monitors, etc. typically receive power from an AC power source. In most cases, however, equipment requires DC power to operate, so power from an AC source must be converted to DC power. The easiest way to achieve this is through a diode rectifier circuit. In this type of circuit, diodes are placed in the circuit so that AC current flows in only one direction, so the output of the rectifier maintains a non-negative voltage. This method is usually the cheapest AC-DC conversion solution, but it also creates the most noise or "pollution" on the AC power network. This is the case because when a power converter is coupled to a load that is not purely resistive (for example, reactive loads including capacitors and inductors), the current drawn from the AC source can be out of phase with the AC voltage, so this can...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M1/42
CPCY02B70/126H02M1/4225Y02B70/10
Inventor 张晓阳
Owner FLEXTRONICS AP LLC