Totem pole power factor correction circuit, control method, device and equipment

Abstract

The invention discloses a totem pole power factor correction circuit, a control method, a device and equipment. The circuit includes: a reactor; a power conversion module; a first capacitor and a second capacitor; a switching module; and a control module used for controlling the switching module and the power supply conversion module according to the load parameter of the load and a preset threshold value, so that the totem pole power factor correction circuit is switched to a boost mode or a voltage doubling mode. The totem-pole PFC circuit is controlled to be switched to the boost mode or the voltage doubling mode according to the relationship between the load parameter of the load and the preset threshold value, the operation mode of the totem-pole PFC circuit can be flexibly switched according to the actual demand of the load, the problem that the operation mode of the totem-pole PFC circuit cannot be changed due to the change of the load parameter is solved, moreover, switching loss caused by change of load parameters of the load is reduced, the power supply conversion efficiency is guaranteed, and the characteristic of saving resources is realized. The method can be widely applied to the technical field of PFC control.

Description

technical field [0001] The present application relates to the technical field of PFC control, in particular to a totem pole power factor correction circuit, control method, device and equipment. Background technique [0002] Power Factor Correction (PFC) technology includes low-frequency PFC technology and high-frequency PFC technology. Power factor refers to the ratio between effective power and total power. The larger the power factor, the higher the power conversion efficiency of power. [0003] High-frequency PFC technology is a PFC technology with a relatively high switching frequency. High-frequency PFC technology mainly includes topologies such as Boost PFC and totem-pole PFC. [0004] The existing totem pole PFC circuit has a higher power factor by making the switching elements in the circuit work at a higher off / on frequency, but this kind of totem pole PFC circuit can only convert the output voltage after rectification Boost, the higher the boost amplitude, the hi...

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Problems solved by technology

[0004] The existing totem pole PFC circuit has a higher power factor by making the switching elements in the circuit work at a higher off / on frequency, but this kind of totem pole PFC circuit can only convert the output voltage after rectification Boost, the higher the boost amplitude, the higher the off / on frequency of the switching element, the switching element works at a higher off / on frequency for a long time, the greater the switching loss, and the power conversion efficiency will also increase. the decline

[0005] The operation mode of the existing totem pole PFC circuit is not flexible enough. Although it has the function of boosting voltage, it is difficult to meet the actual application requirements.

Taking the compressor as an example, when the bus voltage required by the compressor is small, the existing totem pole PFC circuit only needs to boost the output voltage after rectification to meet the bus voltage required by the compressor. The rotating speed is getting higher and higher, and the required bus voltage is also increasing. At this time, the switching elements in the totem pole PFC circuit need to work at a very high off / on frequency to barely provide a high voltage for the compressor. bus voltage, which has the disadvantages of large switching loss and low power conversion efficiency, resulting in a great waste of resources

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