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Tracking boost device used for power factor correction circuit and method

A technology of power factor correction and boosting device, which is applied in the output power conversion device, the conversion of DC power input to DC power output, electrical components, etc. The effect of efficiency

Active Publication Date: 2013-07-17
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method reduces the fluctuation of the voltage Vout1, the current applied to the output feedback terminal Vfb is still affected by the temperature, so the voltage Vout1 is also affected by the temperature

Method used

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  • Tracking boost device used for power factor correction circuit and method
  • Tracking boost device used for power factor correction circuit and method
  • Tracking boost device used for power factor correction circuit and method

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Embodiment Construction

[0057] refer to figure 2 , the power factor correction circuit includes the tracking boost device 20 according to the present invention to provide an error signal Vea related to its input voltage Vin, the sawtooth wave generator 36 generates the sawtooth wave signal Vramp according to the drive signal Vpfc of the switch M1, and the comparator 34 compares the error signal Vea and the sawtooth wave signal Vramp generate an off signal Voff, the auxiliary coil L2 induces the current IL of the inductor L1 to generate a sensing signal Vzcd, and the trigger 32 generates a driving signal Vpfc according to the sensing signal Vzcd and the off signal Voff to switch the switch M1 to input the input voltage Vin Converted to the output voltage Vout1, and the resistors R1 and R2 form a voltage divider to divide the output voltage Vout1 to generate a feedback voltage Vfb at the output feedback terminal 22 for the tracking boost device 20 . Since the error signal Vea is related to the input v...

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Abstract

The invention provides a tracking boost device used for a power factor correction circuit and a method. According to an input voltage of the power factor correction circuit, a feedback voltage associated with an output voltage of the power factor correction circuit or shift of an amplifier in the tracking boost device can be adjusted, so that the output voltage is linearly proportional to rms values of the input voltage, and thus the power factor correction circuit is relatively good in efficiency.

Description

technical field [0001] The present invention relates to a power factor correction (Power Factor Correction; PFC) circuit, in particular to a tracking boost device and method for a power factor correction circuit. Background technique [0002] Efficiency is an important issue for the power supply system of many high-end electronic products, such as notebook computers. For example refer to figure 1 In the power system shown, for high efficiency, the AC voltage VAC is rectified by the rectifier 14 and the main power supply voltage Vin is not directly used as the input voltage of the flyback voltage converter 12, but as the input of the power factor correction (PFC) circuit 10 The PFC circuit 10 generates a voltage Vout1 and then supplies it to the flyback voltage converter 12 as its input voltage. In the PFC circuit 10, the inductor L1 is connected between the rectifier 14 and the switch M1, the PFC controller 16 switches the switch M1 to control the charging and discharging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/42
CPCY02B70/10Y02P80/10
Inventor 吕绍鸿陈曜洲
Owner RICHTEK TECH
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