Single-phase rectification analog control circuit

Abstract

The invention discloses a single-phase rectification analog control circuit. The circuit comprises a voltage outer loop circuit, an analog multiplier, a current inner loop circuit, a modulation wave reconstruction circuit, a voltage reference comparison circuit and a controlled power circuit. A sampling signal of an AC input voltage is multiplied by an analog multiplier circuit, and then a currentinstruction signal (forward operation) which has the same phase with the input voltage or has a phase difference of 180 degrees with the input voltage is outputted. A modulation wave signal outputtedby the current inner loop is superposed with the voltage outputted by a zero-crossing detection circuit, and a reconstructed modulation wave signal with a completely positive potential is generated within the turn-off time of an upper tube and a lower tube of one bridge arm. Compared with a digital control mode, the analog control mode has the advantages that the mode is small in control delay, high in control bandwidth, fast in response, high in anti-interference capability and good in adaptability to a power grid.

Description

technical field [0001] The invention relates to a single-phase rectification control circuit, in particular to a hardware circuit realized by analog control. Background technique [0002] With the development of the economy, the large increase in the number of electrical equipment has brought more and more harmonic pollution to the power grid. The improvement of power factor and harmonic control are becoming more and more important. The traditional diode control rectification method has not met the development requirements. . [0003] The single-phase PFC rectification based on BOOST circuit topology can only realize the single function of absorbing energy from the grid, but cannot realize the function of feeding back energy to the grid, and its application range is limited. [0004] The digital control method of the single-phase rectifier is limited by the modulation error in the operation delay of the processor, and when the harmonic content of the power grid is large and...

AI Technical Summary

Problems solved by technology

[0002] With the development of the economy, the large increase in the number of electrical equipment has brought more and more harmonic pollution to the power grid. The improvement of power factor and harmonic control are becoming more and more important. The traditional diode control rectification method has not met the development requirements.

[0003] The single-phase PFC rectification based on BOOST boost circuit topology can only realize the single function of absorbing energy from the power grid, but cannot realize the function of feeding back energy to the power grid, and its application range is limited.

[0004] The digital control method of the single-phase rectifier is limited by the modulation error in the operation delay of the processor, and when the harmonic content of the power grid is large and the quality is poor, there is also an error in the phase tracking of the voltage operation, and the response speed is slow

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