Power factor correction device and power supply

Abstract

The present disclosure relates to a power factor correction device and a power supply, the device comprises: a power factor correction module; a control module for outputting a control signal to control the conduction state of a transistor, the control module comprises: an adjustment value determination unit for The target current is determined, and the adjustment value is determined according to the target current and the detected current of the inductance in the power factor correction module; the voltage adjustment unit is used to adjust the feedforward voltage signal obtained according to the AC voltage of the input AC current by using the adjustment value; signal generation The unit is configured to use the adjusted voltage to generate a control signal to control the conduction state of the transistor in the power factor correction module. The power factor correction device proposed in the embodiment of the present disclosure improves the loop bandwidth of the PFC, reduces the current distortion, reduces the total harmonic current distortion THD, prevents the generation of the totem-pole PFC backflow current, and improves the stability of the PFC. safety.

Description

technical field [0001] The present disclosure relates to the technical field of integrated circuits, and in particular, to a power factor correction device and a power supply. Background technique [0002] The application of power electronic technology can greatly improve the power density of the electric energy conversion device, and effectively reduce the volume and weight of the device. With the rapid development of power electronic technology, there are more and more power electronic devices, and almost every power electronic device needs to convert alternating current into direct current through rectification and conversion technology. In order to reduce the mutual influence of load harmonics on the power grid and other equipment , the input current harmonic content and power density of each electronic device need to meet the current harmonic requirements of AC electrical equipment. Therefore, it is of great significance to study a PFC (Power Factor Corrector) converte...

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Problems solved by technology

However, when realizing the continuous control of the PFC circuit, the related technology uses a three-input multiplier and a voltage-current loop. However, the frequency bandwidth of the current loop is low, and the current is prone to distortion. Moreover, when the input voltage suddenly drops or drops When the power is turned on, the loop usually does not have time to adjust the pulse width of the control signal, so that the bridgeless PFC generates a large current backflow. On the one hand, the backflow current drains the energy stored in the PFC output capacitor, and on the other hand, the backflow current may be too large and damage the semiconductor power device.

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