Patent ID: 7408791
Filing Date: 2008-08-05
Classification: H02M,H02P

Abstract:
1. A frequency converter assembly comprising: a direct-voltage circuit and brake chopper means, wherein the direct-voltage circuit includes a first branch and a second branch, and the brake chopper means includes a first terminal, a second terminal, a brake chopper switch and control means, wherein the brake chopper switch is arranged in its closed position to provide a braking connection, in which the first branch of the direct voltage circuit is electrically connected to the first terminal and the second branch of the direct voltage circuit is electrically connected to the second terminal, wherein the assembly is provided with a first operating state in which the control means are arranged to control the brake chopper switch selectively to the closed position and the open position in response to a desired power supply direction of the direct-voltage circuit, and a second operating state in which the control means are arranged to maintain the brake chopper switch continuously in the closed position despite a power supply direction of the direct-voltage circuit, and wherein the assembly is arranged such that direct-current power is supplied via the first terminal and the second terminal both into and out of the direct-voltage circuit.