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Power factor correction circuit, control method and controller

A technology of power factor correction and control method, which is applied in the direction of power factor measurement, control/regulation system, output power conversion device, etc.

Active Publication Date: 2019-09-06
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, such schemes are usually only suitable for a specific condition

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  • Power factor correction circuit, control method and controller
  • Power factor correction circuit, control method and controller
  • Power factor correction circuit, control method and controller

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Embodiment 3

[0177] Figure 11 It is the data flow diagram of Embodiment 3 in which the controller of the present invention adjusts each harmonic phase;

[0178] In the third embodiment, the input voltage signal needs to be sampled, and at least one predetermined harmonic component is superimposed in reverse phase in the control signal of the conduction time of the main switching tube of the switching regulator, that is, using T on-new1 adjust the on-time. Such as Figure 11 shown in Figure 5On the basis of , the on-time Ton of the constant on-time mode is further adjusted to reduce the total harmonic distortion. In addition to being provided with a subtractor 51, a voltage compensation module 52, a multiplier 53, a conduction timer 54, a current zero-crossing detection 55 and an RS trigger 56, the controller also includes a harmonic ratio setting module 61, a harmonic phase adjustment module 62. Harmonic generation module 63, multipliers 69-1 to 69-n, adder 64, multiplier 65, divider...

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Abstract

The invention discloses a power factor correction circuit, a control method and a controller. The conduction time of a main switch tube of a switch type regulation circuit is adjusted according to measured total harmonic distortion, and the total harmonic distortion is minimized while power factor correction is carried out, so that special compensation design does not need to be performed aiming at a certain type of factors influencing total harmonic distortion indexes independently, and the overall control method is simplified.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a power factor correction circuit, a control method and a controller. Background technique [0002] Power Factor (PF) is the cosine of the phase difference between voltage and current, and can also be expressed as the ratio of effective power to apparent power. Power factor is a parameter used to measure the power efficiency of electrical equipment, and low power factor represents low power efficiency. By performing power factor correction (Power Factor Correction, PFC) operation, the phase difference between voltage and current can be eliminated or reduced, thereby improving the power factor of the system, improving the transmission efficiency of active power, and improving the grid environment. [0003] Active PFC circuits usually rely on fast closed-loop adjustment of input current, so that the input current of PFC can track the sinusoidal AC input voltage in real time to achie...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02M1/42
CPCH02M1/12H02M1/4258H02M1/4225Y02B70/10H02M1/4208H02M1/0025G01R21/006G05F1/70
Inventor 王兆丰黄晓冬赵晨
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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