High voltage cascading four-quadrant frequency converter unit controller

Abstract

The invention discloses a high voltage cascading four-quadrant frequency converter unit controller which is less susceptible to the interference of a peripheral high-intensity magnetic field and relatively low in cost, and results in more stable voltage of a bus and unlikeliness in over-current fault. The high voltage cascading four-quadrant frequency converter unit controller comprises a sampling circuit, a DSP chip and a CPLD chip, wherein the DSP chip and the CPLD chip are powered by a single power supply; the sampling circuit is completed by a drive plate and then inputted to the DSP chip; the DSP chip is operated in a dual-closed-loop control initiative front-end AFE manner; and the CPLD chip is communicated with a main control box by virtue of an optical fiber, so that the state conversion of units, interaction with the state of an operation box, generation of an IGBT drive signal and the protection logic are realized.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a high-voltage cascaded four-quadrant inverter unit controller. Background technique [0002] In the current market, the unit controller of the high-voltage cascaded four-quadrant inverter mostly adopts the combination of FPGA+AD sampling chip. Limited by chips and sampling channels, the shape and size of the circuit board are too large, the cost is too high, and it can only work with 120-degree feedback. The bus voltage and grid-side feedback current are not closed-loop, and overcurrent faults are prone to occur. Contents of the invention [0003] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a high-voltage cascaded four-quadrant inverter unit controller, which is not easily disturbed by the surrounding strong magnetic field, has low cost, makes the bus voltage more stable, and is not easy to An overcu...

AI Technical Summary

Problems solved by technology

[0002] In the current market, the unit controller of the high-voltage cascaded four-quadrant inverter mostly adopts the combination of FPGA+AD sampling chip. Limited by chips and sampling channels, the shape and size of the circuit board are too large, the cost is too high, and it can only work with 120-degree feedback. The bus voltage and grid-side feedback current are not closed-loop, and overcurrent faults are prone to occur.

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