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Power factor correcting circuit and input feedforward compensating circuit thereof

A technology of power factor correction and feedforward compensation, which is applied in the direction of high-efficiency power electronic conversion, output power conversion devices, electrical components, etc., can solve problems such as output voltage or current fluctuation, and achieve the effect of rapid adjustment

Active Publication Date: 2013-04-24
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a power factor correction circuit and its input feedforward compensation circuit, which can solve the problem of large fluctuations in output voltage or current caused by sudden changes in input voltage

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  • Power factor correcting circuit and input feedforward compensating circuit thereof
  • Power factor correcting circuit and input feedforward compensating circuit thereof
  • Power factor correcting circuit and input feedforward compensating circuit thereof

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Embodiment Construction

[0050] The present invention will be further described below with reference to specific embodiments and drawings, but the protection scope of the present invention should not be limited by this.

[0051] reference image 3 with Figure 4 , Figure 4 show image 3 The working waveform of the input feedforward compensation circuit in. The input feedforward compensation circuit of this embodiment mainly includes: a peak value acquisition module 31, an inversion circuit 304, and a superposition circuit 305.

[0052] The peak value obtaining module 31 is connected to the output end of the rectifier bridge in the power factor correction circuit to obtain the peak value of the input voltage. Those skilled in the art should understand that the peak value obtaining module 31 can also obtain a signal reflecting the peak value of the input voltage, or obtain an electrical parameter reflecting the peak value of the input voltage.

[0053] It should be noted that the "peak value of the input vol...

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Abstract

The invention provides a power factor correcting circuit and an input feedforward compensating circuit thereof. The input feedforward compensating circuit comprises a peak acquisition module, an inverse circuit which is connected with the peak acquisition module and a superposed circuit which is connected with the inverse circuit. The peak acquisition module acquires a peak of an input voltage or reflects signal of the peak of the input voltage. The inverse circuit generates direct current signals which are opposite to the variation trend of the peak of the input voltage. The superposed circuit superposes the direct current signals and output signals of an error-amplifying network in a control circuit of the power factor correcting circuit. The power factor correcting circuit and the input feedforward compensating circuit thereof is capable of superposing change information of the input voltage on the output signals of a regulating ring of the control circuit when the input voltage suddenly changes, and therefore slow loop regulating is avoided, and the problem that larger fluctuations of an output voltage or current are caused by a sudden change of the input voltage is avoided.

Description

Technical field [0001] The invention relates to switching power supply technology, in particular to a power factor correction circuit and its input feedforward compensation circuit. Background technique [0002] Due to the presence of non-linear components and energy storage components in most current electrical equipment, the input AC current waveform will be severely distorted, resulting in a very low input power factor on the grid side. In order to meet the harmonic requirements of the international standard IEC61000-3-2, power factor correction (PFC) devices must be added to these electrical equipment. [0003] In order to suppress the power frequency ripple and obtain a higher power factor, the bandwidth of the control loop of the traditional PFC circuit is usually set to be relatively low. A lower loop bandwidth will result in a slower dynamic response speed of the PFC circuit. Take the high power factor LED driver (constant current output) as an example. When the input volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/14
CPCY02B70/126Y02B70/10
Inventor 谢小高叶美盼吴建兴
Owner HANGZHOU SILAN MICROELECTRONICS