Patent ID: 7859871
Filing Date: 2010-12-28
Classification: H02J,H02M

Abstract:
1. A method for controlling the voltage and power of several HF inverters ( 2 ), connected in parallel at the output, of an electrically isolated inverter assembly as well as for distributing the load to these HF inverters ( 2 ) each consisting of at least one DC-DC converter ( 3 ), one intermediate circuit ( 4 ) and one DC-AC converter ( 5 ), with a command variable (U i ′) being formed for each HF inverter ( 2 ) so as to preset a nominal value for control of an intermediate-circuit voltage (U ZKi ) at the intermediate circuit ( 4 ) of the HF inverter ( 2 ), wherein the load of each HF inverter ( 2 ) is determined by a control unit ( 13 ) at the input of each HF inverter ( 2 ) by measuring the input power (P i ), that a virtual internal resistance of each HF inverter ( 2 ) is simulated by each control unit ( 13 ), via which internal resistance a virtual voltage drop (U VR ) is caused which depends on the load determined, which virtual voltage decrease (U VR ) is used for controlling the voltage (U ZKi ) of the intermediate circuit ( 4 ) so as to produce a purposive change in the output voltage of each HF inverter ( 2 ).