Double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control

Abstract

The invention discloses a double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control, a bridge rectification circuit is then connected with a BOCBB type double-tube Buck-Boost converter; one path of output signal of a PI (proportion integral) adjuster is sent to a noninverting input end of a comparator, the other path of output signal is superposed with a sampling signal of input current and then is sent to a resettable integrator, an output end of the resettable integrator is connected with an inverting input end of the comparator, an output end of the comparator is connected with an RS (remote sensing) trigger, one end of the RS trigger is connected with a reset switch of the resettable integrator, and a Q-end output signal of the RS trigger simultaneously drives two switching tubes of the BOCBB type double-tube Buck-Boost converter after passing by a driving circuit. The converter disclosed by the invention not only can realize output voltage raising and reducing control, but also can improve a network side power factor, reduces the distortion factor of network entry current, has the advantages of simple structure, high system efficiency and the like and is convenient to control.

Description

technical field [0001] The invention relates to a PFC converter, in particular to a double-tube Buck-Boost type PFC converter based on single-cycle control. Background technique [0002] In recent years, power electronic devices have been widely used. Most of these devices are powered by DC, so the rectifier has become an indispensable part of power electronic products. The simplest rectification device is realized by a diode rectifier bridge and a large filter capacitor, and its output is a non-adjustable DC voltage. Since the conduction angle of the rectifier diode is very small, the power grid only provides energy to the load in a small part of each power frequency cycle, and its input current waveform contains rich high-order harmonics. [0003] Current harmonics bring a series of hazards to the system itself and the surrounding electromagnetic environment, especially to the power system, communication system, and instrumentation. These hazards are mainly manifested in...

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Problems solved by technology

[0004] (1) Harmonic components will affect the power supply quality of the power supply system;

[0005] (2) Harmonic components increase losses in power transmission, power distribution and power consumption systems;

[0006] (3) Harmonic components affect the safety of the power supply system;

[0007] (4) Harmonic components will cause some important control, protection and measurement devices to malfunction;

These control methods can achieve very good control effects, but the control circuit requires a multiplier, which increases the complexity of the control

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