Digital power factor correction controller with fast transient response function

Abstract

The invention relates to a digital power factor correction controller with a fast transient response function. The digital power factor correction controller comprises a Boost type switch converter power stage main topology structure, an A / D (analog to digital) sampling transverter, a PID (proportion integration differentiation) controller, a current limiting unit, a digital pulse width modulator and a driving unit. The digital power factor correction controller is characterized in that a fast response loop is additionally added, the input end of the fast response loop is connected with the output voltage of a switch converter, the output end of the fast response loop is connected with the output end of the digital pulse width modulator, the fast response loop comprises a frequency selection network, an error amplifier and an output stage, the input end of the frequency selection network is connected with the output voltage of the switch converter, the output end of the frequency selection network is connected with the error amplifier, the output end of the error amplifier is connected with the input end of the output stage, and the output end of the output stage is connected with the output end of the digital pulse width modulator.

Description

technical field [0001] The invention relates to power factor correction technology, in particular to a digital power factor correction controller with fast transient response, which can improve the transient response speed of the output voltage of a switch converter, and belongs to the field of microelectronic technology. Background technique [0002] Power factor correction technology is a powerful measure to reduce the harmonic pollution caused by electrical equipment to the power grid and improve power efficiency. The power factor of electrical equipment is an important index to measure its performance, and the most fundamental way to improve the power factor is to adopt active power factor correction technology. In recent years, due to the demand for intelligent power supplies, digital power factor correction controllers have been developed rapidly and widely used in practice. [0003] In the design of traditional digital power factor correction controllers, in order to...

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Problems solved by technology

[0003] In the design of traditional digital power factor correction controllers, in order to avoid the impact of output voltage ripple on system stability, the bandwidth is usually designed to be very low, and the digital converter also has delay effects and nonlinear effects, which seriously Affects load transient response

Traditional digital power factor correction converters only include a voltage regulation loop, which is limited by system stability requirements, algorithm execution time, A / D sampling time, signal transmission delay, etc., and the transient response speed is very slow

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