Auxiliary resonant commutated pole converter with voltage balancing circuit

摘要

A resonant power converter is provided. The resonant power converter comprises a balancing circuit for balancing the voltage in a feeding connection. The balancing circuit comprises: a first positive control means in series with an inductor, wherein the first positive control means and the inductor is coupled between the positive DC conductor and the feeding connection, and a second negative control means in series with the inductor, wherein the second negative control means are coupled between the negative DC conductor and the feeding connection. The first positive and second negative control means are adapted to be alternatingly switched on and off for balancing the resonant power converter, such that the voltage in the feeding connection is substantially the mean voltage of the positive DC conductor and the negative DC conductor.

主权项

1. A resonant power converter comprising:
a DC power source; a positive DC conductor; a negative DC conductor; a phase conductor; and a power converting unit coupled between the DC power source and the phase conductor, the power converting unit comprising:
a first switch coupled between the positive DC conductor and the phase conductor and a first diode connected in parallel with the first switch,a second switch coupled between the negative DC conductor and the phase conductor and a second diode connected in parallel with the second switch, anda resonant auxiliary switching circuit coupled between a feeding connection on the DC power source and the phase conductor, the resonant auxiliary switching circuit comprising a control for controlling a current flow through the resonant auxiliary switching circuit between the feeding connection and the phase conductor; a balancing circuit for balancing a voltage in the feeding connection, the balancing circuit comprising:
a first positive control in series with an inductor, wherein the first positive control and the inductor are coupled between the positive DC conductor and the feeding connection, anda second negative control in series with the inductor, wherein the second negative control is coupled between the negative DC conductor and the feeding connection,wherein the first positive and second negative controls are configured to be alternatingly switched on and off for balancing the resonant power converter, such that the voltage in the feeding connection is substantially a mean voltage of the positive DC conductor and the negative DC conductor.