Auxiliary converter, single-phase rectifier and control method thereof

Abstract

The invention discloses an auxiliary converter, a single-phase rectifier and a control method thereof; the single-phase rectifier comprises: a diode single-phase bridge for rectifying an AC input current into a DC current; the output of the diode single-phase bridge is connected to a boost half-bridge The midpoint of the bridge arm; boost half-bridge, boost half-bridge includes a fast recovery diode and a fully-controlled device in series; used to control the waveform of the AC input current to be sinusoidal; DC capacitor, connected in parallel with the boost half-bridge; controller , used to sample the AC input current and DC output voltage; and calculate the duty cycle of the boost half-bridge according to the sampled value of the AC input current, the sampled value of the DC output voltage and the given value of the DC output voltage, and convert The control pulse is sent to the boost half-bridge. By adopting the solution provided by the invention, only one fully-controlled power semiconductor device is needed, which is significantly less than that of a traditional four-quadrant rectifier.

Description

technical field [0001] The invention relates to the field of rail transit vehicle equipment, in particular to an auxiliary converter, a single-phase rectifier and a control method thereof. Background technique [0002] Auxiliary converters are important on-board equipment for rail vehicles (locomotives, bullet trains), which provide three-phase AC power for auxiliary loads other than train traction. figure 1 A schematic diagram of the auxiliary converter in a vehicle is shown. Traditionally, a traction transformer with an integrated auxiliary winding has been used to power the auxiliary converter. The auxiliary converter consists of a four-quadrant rectifier and a three-phase inverter. figure 2 A schematic diagram of a four-quadrant rectifier employed in the prior art is shown. [0003] The auxiliary converter in this mode does not require the four-quadrant rectifier to work in the inverter state under any working conditions, that is, the four-quadrant rectifier only wor...

AI Technical Summary

Problems solved by technology

Therefore, it is a waste of cost for the existing four-quadrant rectifier

[0004] In addition, the traditional auxiliary converter needs to use the phase information of the grid voltage, which also increases the complexity and fault points of the auxiliary converter.

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