Patent ID: 7705554

Claim:
A circuit arrangement for adjusting the power consumption of a load of a motor that can be operated by a direct-voltage system, the circuit comprising at least one semiconductor switch in the supply current circuit of the load, a control unit for triggering the semiconductor switch or switches, at least one sense FET operable to connect the load to the direct-voltage system, and means connecting the measurement output of the sense FET to the control unit, the control unit being operable to furnish a signal corresponding to the current consumption of the load at the respective operating point, wherein the load is connectable to the direct-voltage system selectively via at least one resistor and at least one sense FET both of which are connected in series with the load and together carry one level of current to the load, or via a further semiconductor switch and a current path without a series resistor, which further semiconductor switch and current path carries a second level of current to the load.