Method and device for controlling voltage zero crossing point current distortion of totem-pole PFC

Abstract

The invention relates to a method and a device for controlling voltage zero crossing point current distortion of a totem-pole PFC. Input and output voltage information and inductance current information are sampled through a sampling module; error signals are compensated and adjusted through a voltage outer loop adjusting unit and a current inner loop adjusting unit; and finally the processed error signals are sent to a PWM modulator to generate a gating signal. The zero crossing point state of the input voltage of each half of the power frequency period is detected to be inserted into dead zone control and bipolar control; soft start of a main switch tube of a high-frequency bridge arm in the dead zone control stage is completed, and the inductance current is constrained without generating a pulse peak; and in the bipolar control stage, the current constraint condition also can be established under the condition that the input voltage is relatively low, so that the input current can be more effectively corrected to enable the input current to follow the input voltage. The device can be stably operated in a CCM control mode, and the problem of zero crossing point pulse is solved, so that the overall power factor value is improved, and the total harmonic distortion amount of the whole system is reduced.

Description

technical field [0001] The invention belongs to the field of power factor correction, and in particular relates to a voltage zero-crossing current distortion control method and a control device of a totem pole PFC. Background technique [0002] In the use of electronic equipment, there are problems of electromagnetic interference EMI and electromagnetic compatibility EMC, that is, electromagnetic pollution. Countries around the world attach great importance to this pollution, and have formulated corresponding standards since the 1990s. In order to solve the harmonic pollution caused by power electronic devices to the power grid, power factor correction (PFC, PowerFactorCorrection) technology has been developed rapidly. Compared with the bridged BoostPFC, the bridgeless BoostPFC has higher efficiency and smaller volume, but the traditional bridgeless BoostPFC has strong common mode interference and large EMI. Totem BoostPFC, as an evolution circuit of bridgeless BoostPFC, h...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a voltage zero-crossing current distortion control method and control device of a totem-pole PFC, aiming to solve the problem that the input current in the totem-pole PFC control scheme in the prior art cannot smoothly transition at the voltage zero-crossing point, and distortion occurs The problem

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