Method for controlling frequency converter unit, and frequency converter assembly

• US 20080310206A1
• Filed: 06/04/2008
• Published: 12/18/2008
• Est. Priority Date: 06/06/2007
• Status: Active Grant

• Current Assignee: Abb Oy (ABB Limited)
• Original Assignee: Abb Oy (ABB Limited)
• Inventors: Kangas, Jani
• Granted Patent: US 8,755,210 B2
• Time in Patent Office: Days
• US Class Current: 363/170
• CPC Class Codes: H02J 13/00007 using the power network as support for the transmission
• CPC Class Codes: H02J 3/02 using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
• CPC Class Codes: H02M 1/0009 Devices or circuits for detecting current in a converter
• CPC Class Codes: H04B 2203/5483 using coupling circuits
• CPC Class Codes: H04B 3/56 Circuits for coupling, blocking, or by-passing of signals

Abstract

A method for controlling a frequency converter unit, the frequency converter unit containing an input connection for supplying electric power at an input frequency to the frequency converter unit, and an output connection for supplying electric power at an output frequency from the frequency converter unit, the method comprising a control step, in which the frequency converter unit is controlled by means of control signals. In the control step the control signals are supplied through an inductive connection to at least one wire connected to the input connection or the output connection of the frequency converter unit for transmitting electric power, the control signals being supplied to the frequency converter unit over the at least one wire.

Claims

1. A method for controlling a frequency converter unit, the frequency converter unit containing an input connection for supplying electric power at an input frequency to the frequency converter unit, and an output connection for supplying electric power at an output frequency from the frequency converter unit, the method comprising a control step, in which the frequency converter unit is controlled by means of control signals, wherein in the control step the control signals are supplied through an inductive connection to at least one wire connected to the input connection or the output connection of the frequency converter unit for transmitting electric power, the control signals being supplied to the frequency converter unit over the at least one wire.

2. A frequency converter unit comprising a frequency converter unit and a user interface means, the frequency converter unit containing an input connection for supplying electric power at an input frequency to the frequency converter unit, and an output connection for supplying electric power at an output frequency from the frequency converter unit, the user interface means being configured to control the frequency converter unit by means of control signals, wherein the user interface means is arranged to transmit control signals to the frequency converter unit through the input connection or the output connection of the frequency converter unit, the user interface means being arranged to be inductively connected to at least one wire, which is connected to the input connection or the output connection of the frequency converter unit for transmitting electric power, to allow the control signals to be transmitted to the frequency converter unit over the at least one wire.

3. A frequency converter assembly according to claim 2, wherein the frequency converter assembly further comprises a signal interface means arranged to convey the control signals from the user interface means to the at least one wire, the signal interface means comprising an openable induction loop having an open position and a closed position, the open position being arranged for setting the openable induction loop around the at least one wire and the closed position being arranged for supplying control signals to the at least one wire inside the openable induction loop.