1. A surgical instrument (10), especially a high-frequency surgical instrument for the surgical instrument power supply (11), a boost converter (19) which is adapted to convert the alternating mains voltage into a voltage in the intermediate circuit and to the intermediate circuit power supply (20) constant voltage with the unit (21) power, which has connected to the intermediate circuit (20), the inverter (43) and a transformer (22) which is connected to the inverter (43) primary winding (44) and a secondary winding (45) for HEATING food dressing (16) to the control device (25) which is controllably connected to the boost converter (19) circuit (29) controls power factor correction and controllably attached to the block (21), a supply circuit (30) power control, which are connected with each other via a digital communication interface (31) .2. The surgical instrument of claim. 1, characterized in that the circuit (30), power control, moreover, the control manner is connected to the load (16) .3. The surgical instrument of claim. 2, characterized in that the load (16) is actuable in different modes of operation in which it has different moschnosti.4 consumed. The surgical instrument of claim. 2, characterized in that the circuit (30), power control is executed to set the operating mode of the load (16), and that the circuit (30), power control is also performed for the control unit, respectively (21) supply, and the circuit (29 ) control the power factor correction - operation mode of the load (16) .5. The surgical instrument of claim. 4, characterized in that the circuit (30) configured to control power adjustment unit (21) before switching the power mode for the next variable1. Хирургический прибор (10), прежде всего высокочастотный хирургический прибор, для питания хирургического инструмента (11),с повышающим преобразователем (19), который выполнен для преобразования переменного сетевого напряжения в напряжение в промежуточном контуре и для питания промежуточного
