METHOD AND ARRANGEMENT IN CONNECTION WITH A BRAKE CHOPPER
First Claim
1. A method of controlling a brake chopper, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, which method comprises steps of:
- forming with the inverter bridge an output voltage to a load connected to the output of the inverter bridge,determining a time instant when the DC current of the intermediate circuit is sampled, andpreventing the use of the brake chopper at the determined time instant.
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Accused Products
Abstract
A method of controlling a brake chopper and a control arrangement, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, which method comprises steps of forming with the inverter bridge an output voltage to a load connected to the output of the inverter bridge, determining a time instant when the DC current of the intermediate circuit is sampled, and preventing the use of the brake chopper at the determined time instant.
15 Citations
8 Claims
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1. A method of controlling a brake chopper, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, which method comprises steps of:
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forming with the inverter bridge an output voltage to a load connected to the output of the inverter bridge, determining a time instant when the DC current of the intermediate circuit is sampled, and preventing the use of the brake chopper at the determined time instant. - View Dependent Claims (2, 3, 4, 7, 8)
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5. A brake chopper control arrangement, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, wherein the arrangement comprises:
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means for determining a time instant when the DC current of the intermediate circuit is sampled, and means for preventing the use of the brake chopper at the determined time instant. - View Dependent Claims (6)
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Specification